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![Liam Howlett](/assets/img/avatar_default.png)
Use vma_lookup() to find the VMA at a specific address. As vma_lookup() will return NULL if the address is not within any VMA, the start address no longer needs to be validated. Link: https://lkml.kernel.org/r/20210521174745.2219620-8-Liam.Howlett@Oracle.com Signed-off-by: Liam R. Howlett <Liam.Howlett@Oracle.com> Reviewed-by: Laurent Dufour <ldufour@linux.ibm.com> Acked-by: David Hildenbrand <david@redhat.com> Acked-by: Davidlohr Bueso <dbueso@suse.de> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2556 lines
62 KiB
C
2556 lines
62 KiB
C
/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 1994 - 1999, 2000, 01, 06 Ralf Baechle
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* Copyright (C) 1995, 1996 Paul M. Antoine
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* Copyright (C) 1998 Ulf Carlsson
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* Copyright (C) 1999 Silicon Graphics, Inc.
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* Kevin D. Kissell, kevink@mips.com and Carsten Langgaard, carstenl@mips.com
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* Copyright (C) 2002, 2003, 2004, 2005, 2007 Maciej W. Rozycki
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* Copyright (C) 2000, 2001, 2012 MIPS Technologies, Inc. All rights reserved.
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* Copyright (C) 2014, Imagination Technologies Ltd.
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*/
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#include <linux/bitops.h>
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#include <linux/bug.h>
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#include <linux/compiler.h>
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#include <linux/context_tracking.h>
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#include <linux/cpu_pm.h>
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#include <linux/kexec.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/extable.h>
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#include <linux/mm.h>
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#include <linux/sched/mm.h>
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#include <linux/sched/debug.h>
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#include <linux/smp.h>
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#include <linux/spinlock.h>
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#include <linux/kallsyms.h>
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#include <linux/memblock.h>
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#include <linux/interrupt.h>
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#include <linux/ptrace.h>
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#include <linux/kgdb.h>
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#include <linux/kdebug.h>
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#include <linux/kprobes.h>
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#include <linux/notifier.h>
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#include <linux/kdb.h>
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#include <linux/irq.h>
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#include <linux/perf_event.h>
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#include <asm/addrspace.h>
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#include <asm/bootinfo.h>
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#include <asm/branch.h>
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#include <asm/break.h>
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#include <asm/cop2.h>
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#include <asm/cpu.h>
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#include <asm/cpu-type.h>
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#include <asm/dsp.h>
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#include <asm/fpu.h>
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#include <asm/fpu_emulator.h>
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#include <asm/idle.h>
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#include <asm/isa-rev.h>
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#include <asm/mips-cps.h>
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#include <asm/mips-r2-to-r6-emul.h>
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#include <asm/mipsregs.h>
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#include <asm/mipsmtregs.h>
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#include <asm/module.h>
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#include <asm/msa.h>
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#include <asm/ptrace.h>
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#include <asm/sections.h>
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#include <asm/siginfo.h>
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#include <asm/tlbdebug.h>
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#include <asm/traps.h>
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#include <linux/uaccess.h>
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#include <asm/watch.h>
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#include <asm/mmu_context.h>
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#include <asm/types.h>
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#include <asm/stacktrace.h>
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#include <asm/tlbex.h>
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#include <asm/uasm.h>
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#include <asm/mach-loongson64/cpucfg-emul.h>
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#include "access-helper.h"
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extern void check_wait(void);
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extern asmlinkage void rollback_handle_int(void);
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extern asmlinkage void handle_int(void);
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extern asmlinkage void handle_adel(void);
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extern asmlinkage void handle_ades(void);
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extern asmlinkage void handle_ibe(void);
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extern asmlinkage void handle_dbe(void);
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extern asmlinkage void handle_sys(void);
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extern asmlinkage void handle_bp(void);
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extern asmlinkage void handle_ri(void);
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extern asmlinkage void handle_ri_rdhwr_tlbp(void);
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extern asmlinkage void handle_ri_rdhwr(void);
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extern asmlinkage void handle_cpu(void);
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extern asmlinkage void handle_ov(void);
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extern asmlinkage void handle_tr(void);
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extern asmlinkage void handle_msa_fpe(void);
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extern asmlinkage void handle_fpe(void);
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extern asmlinkage void handle_ftlb(void);
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extern asmlinkage void handle_gsexc(void);
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extern asmlinkage void handle_msa(void);
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extern asmlinkage void handle_mdmx(void);
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extern asmlinkage void handle_watch(void);
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extern asmlinkage void handle_mt(void);
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extern asmlinkage void handle_dsp(void);
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extern asmlinkage void handle_mcheck(void);
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extern asmlinkage void handle_reserved(void);
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extern void tlb_do_page_fault_0(void);
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void (*board_be_init)(void);
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int (*board_be_handler)(struct pt_regs *regs, int is_fixup);
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void (*board_nmi_handler_setup)(void);
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void (*board_ejtag_handler_setup)(void);
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void (*board_bind_eic_interrupt)(int irq, int regset);
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void (*board_ebase_setup)(void);
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void(*board_cache_error_setup)(void);
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static void show_raw_backtrace(unsigned long reg29, const char *loglvl,
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bool user)
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{
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unsigned long *sp = (unsigned long *)(reg29 & ~3);
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unsigned long addr;
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printk("%sCall Trace:", loglvl);
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#ifdef CONFIG_KALLSYMS
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printk("%s\n", loglvl);
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#endif
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while (!kstack_end(sp)) {
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if (__get_addr(&addr, sp++, user)) {
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printk("%s (Bad stack address)", loglvl);
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break;
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}
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if (__kernel_text_address(addr))
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print_ip_sym(loglvl, addr);
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}
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printk("%s\n", loglvl);
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}
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#ifdef CONFIG_KALLSYMS
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int raw_show_trace;
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static int __init set_raw_show_trace(char *str)
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{
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raw_show_trace = 1;
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return 1;
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}
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__setup("raw_show_trace", set_raw_show_trace);
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#endif
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static void show_backtrace(struct task_struct *task, const struct pt_regs *regs,
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const char *loglvl, bool user)
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{
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unsigned long sp = regs->regs[29];
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unsigned long ra = regs->regs[31];
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unsigned long pc = regs->cp0_epc;
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if (!task)
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task = current;
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if (raw_show_trace || user_mode(regs) || !__kernel_text_address(pc)) {
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show_raw_backtrace(sp, loglvl, user);
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return;
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}
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printk("%sCall Trace:\n", loglvl);
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do {
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print_ip_sym(loglvl, pc);
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pc = unwind_stack(task, &sp, pc, &ra);
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} while (pc);
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pr_cont("\n");
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}
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/*
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* This routine abuses get_user()/put_user() to reference pointers
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* with at least a bit of error checking ...
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*/
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static void show_stacktrace(struct task_struct *task,
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const struct pt_regs *regs, const char *loglvl, bool user)
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{
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const int field = 2 * sizeof(unsigned long);
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unsigned long stackdata;
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int i;
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unsigned long *sp = (unsigned long *)regs->regs[29];
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printk("%sStack :", loglvl);
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i = 0;
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while ((unsigned long) sp & (PAGE_SIZE - 1)) {
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if (i && ((i % (64 / field)) == 0)) {
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pr_cont("\n");
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printk("%s ", loglvl);
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}
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if (i > 39) {
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pr_cont(" ...");
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break;
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}
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if (__get_addr(&stackdata, sp++, user)) {
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pr_cont(" (Bad stack address)");
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break;
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}
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pr_cont(" %0*lx", field, stackdata);
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i++;
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}
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pr_cont("\n");
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show_backtrace(task, regs, loglvl, user);
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}
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void show_stack(struct task_struct *task, unsigned long *sp, const char *loglvl)
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{
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struct pt_regs regs;
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regs.cp0_status = KSU_KERNEL;
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if (sp) {
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regs.regs[29] = (unsigned long)sp;
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regs.regs[31] = 0;
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regs.cp0_epc = 0;
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} else {
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if (task && task != current) {
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regs.regs[29] = task->thread.reg29;
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regs.regs[31] = 0;
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regs.cp0_epc = task->thread.reg31;
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} else {
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prepare_frametrace(®s);
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}
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}
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show_stacktrace(task, ®s, loglvl, false);
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}
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static void show_code(void *pc, bool user)
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{
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long i;
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unsigned short *pc16 = NULL;
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printk("Code:");
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if ((unsigned long)pc & 1)
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pc16 = (u16 *)((unsigned long)pc & ~1);
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for(i = -3 ; i < 6 ; i++) {
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if (pc16) {
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u16 insn16;
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if (__get_inst16(&insn16, pc16 + i, user))
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goto bad_address;
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pr_cont("%c%04x%c", (i?' ':'<'), insn16, (i?' ':'>'));
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} else {
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u32 insn32;
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if (__get_inst32(&insn32, (u32 *)pc + i, user))
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goto bad_address;
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pr_cont("%c%08x%c", (i?' ':'<'), insn32, (i?' ':'>'));
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}
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}
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pr_cont("\n");
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return;
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bad_address:
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pr_cont(" (Bad address in epc)\n\n");
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}
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static void __show_regs(const struct pt_regs *regs)
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{
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const int field = 2 * sizeof(unsigned long);
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unsigned int cause = regs->cp0_cause;
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unsigned int exccode;
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int i;
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show_regs_print_info(KERN_DEFAULT);
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/*
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* Saved main processor registers
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*/
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for (i = 0; i < 32; ) {
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if ((i % 4) == 0)
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printk("$%2d :", i);
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if (i == 0)
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pr_cont(" %0*lx", field, 0UL);
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else if (i == 26 || i == 27)
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pr_cont(" %*s", field, "");
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else
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pr_cont(" %0*lx", field, regs->regs[i]);
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i++;
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if ((i % 4) == 0)
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pr_cont("\n");
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}
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#ifdef CONFIG_CPU_HAS_SMARTMIPS
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printk("Acx : %0*lx\n", field, regs->acx);
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#endif
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if (MIPS_ISA_REV < 6) {
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printk("Hi : %0*lx\n", field, regs->hi);
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printk("Lo : %0*lx\n", field, regs->lo);
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}
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/*
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* Saved cp0 registers
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*/
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printk("epc : %0*lx %pS\n", field, regs->cp0_epc,
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(void *) regs->cp0_epc);
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printk("ra : %0*lx %pS\n", field, regs->regs[31],
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(void *) regs->regs[31]);
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printk("Status: %08x ", (uint32_t) regs->cp0_status);
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if (cpu_has_3kex) {
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if (regs->cp0_status & ST0_KUO)
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pr_cont("KUo ");
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if (regs->cp0_status & ST0_IEO)
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pr_cont("IEo ");
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if (regs->cp0_status & ST0_KUP)
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pr_cont("KUp ");
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if (regs->cp0_status & ST0_IEP)
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pr_cont("IEp ");
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if (regs->cp0_status & ST0_KUC)
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pr_cont("KUc ");
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if (regs->cp0_status & ST0_IEC)
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pr_cont("IEc ");
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} else if (cpu_has_4kex) {
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if (regs->cp0_status & ST0_KX)
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pr_cont("KX ");
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if (regs->cp0_status & ST0_SX)
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pr_cont("SX ");
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if (regs->cp0_status & ST0_UX)
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pr_cont("UX ");
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switch (regs->cp0_status & ST0_KSU) {
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case KSU_USER:
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pr_cont("USER ");
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break;
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case KSU_SUPERVISOR:
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pr_cont("SUPERVISOR ");
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break;
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case KSU_KERNEL:
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pr_cont("KERNEL ");
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break;
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default:
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pr_cont("BAD_MODE ");
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break;
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}
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if (regs->cp0_status & ST0_ERL)
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pr_cont("ERL ");
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if (regs->cp0_status & ST0_EXL)
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pr_cont("EXL ");
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if (regs->cp0_status & ST0_IE)
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pr_cont("IE ");
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}
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pr_cont("\n");
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exccode = (cause & CAUSEF_EXCCODE) >> CAUSEB_EXCCODE;
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printk("Cause : %08x (ExcCode %02x)\n", cause, exccode);
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if (1 <= exccode && exccode <= 5)
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printk("BadVA : %0*lx\n", field, regs->cp0_badvaddr);
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printk("PrId : %08x (%s)\n", read_c0_prid(),
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cpu_name_string());
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}
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|
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/*
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* FIXME: really the generic show_regs should take a const pointer argument.
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*/
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void show_regs(struct pt_regs *regs)
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{
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__show_regs(regs);
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dump_stack();
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}
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void show_registers(struct pt_regs *regs)
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{
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const int field = 2 * sizeof(unsigned long);
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__show_regs(regs);
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print_modules();
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printk("Process %s (pid: %d, threadinfo=%p, task=%p, tls=%0*lx)\n",
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current->comm, current->pid, current_thread_info(), current,
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field, current_thread_info()->tp_value);
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if (cpu_has_userlocal) {
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unsigned long tls;
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tls = read_c0_userlocal();
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if (tls != current_thread_info()->tp_value)
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printk("*HwTLS: %0*lx\n", field, tls);
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}
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show_stacktrace(current, regs, KERN_DEFAULT, user_mode(regs));
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show_code((void *)regs->cp0_epc, user_mode(regs));
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printk("\n");
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}
|
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|
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static DEFINE_RAW_SPINLOCK(die_lock);
|
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|
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void __noreturn die(const char *str, struct pt_regs *regs)
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{
|
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static int die_counter;
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int sig = SIGSEGV;
|
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|
|
oops_enter();
|
|
|
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if (notify_die(DIE_OOPS, str, regs, 0, current->thread.trap_nr,
|
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SIGSEGV) == NOTIFY_STOP)
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sig = 0;
|
|
|
|
console_verbose();
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raw_spin_lock_irq(&die_lock);
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bust_spinlocks(1);
|
|
|
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printk("%s[#%d]:\n", str, ++die_counter);
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show_registers(regs);
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add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE);
|
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raw_spin_unlock_irq(&die_lock);
|
|
|
|
oops_exit();
|
|
|
|
if (in_interrupt())
|
|
panic("Fatal exception in interrupt");
|
|
|
|
if (panic_on_oops)
|
|
panic("Fatal exception");
|
|
|
|
if (regs && kexec_should_crash(current))
|
|
crash_kexec(regs);
|
|
|
|
do_exit(sig);
|
|
}
|
|
|
|
extern struct exception_table_entry __start___dbe_table[];
|
|
extern struct exception_table_entry __stop___dbe_table[];
|
|
|
|
__asm__(
|
|
" .section __dbe_table, \"a\"\n"
|
|
" .previous \n");
|
|
|
|
/* Given an address, look for it in the exception tables. */
|
|
static const struct exception_table_entry *search_dbe_tables(unsigned long addr)
|
|
{
|
|
const struct exception_table_entry *e;
|
|
|
|
e = search_extable(__start___dbe_table,
|
|
__stop___dbe_table - __start___dbe_table, addr);
|
|
if (!e)
|
|
e = search_module_dbetables(addr);
|
|
return e;
|
|
}
|
|
|
|
asmlinkage void do_be(struct pt_regs *regs)
|
|
{
|
|
const int field = 2 * sizeof(unsigned long);
|
|
const struct exception_table_entry *fixup = NULL;
|
|
int data = regs->cp0_cause & 4;
|
|
int action = MIPS_BE_FATAL;
|
|
enum ctx_state prev_state;
|
|
|
|
prev_state = exception_enter();
|
|
/* XXX For now. Fixme, this searches the wrong table ... */
|
|
if (data && !user_mode(regs))
|
|
fixup = search_dbe_tables(exception_epc(regs));
|
|
|
|
if (fixup)
|
|
action = MIPS_BE_FIXUP;
|
|
|
|
if (board_be_handler)
|
|
action = board_be_handler(regs, fixup != NULL);
|
|
else
|
|
mips_cm_error_report();
|
|
|
|
switch (action) {
|
|
case MIPS_BE_DISCARD:
|
|
goto out;
|
|
case MIPS_BE_FIXUP:
|
|
if (fixup) {
|
|
regs->cp0_epc = fixup->nextinsn;
|
|
goto out;
|
|
}
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* Assume it would be too dangerous to continue ...
|
|
*/
|
|
printk(KERN_ALERT "%s bus error, epc == %0*lx, ra == %0*lx\n",
|
|
data ? "Data" : "Instruction",
|
|
field, regs->cp0_epc, field, regs->regs[31]);
|
|
if (notify_die(DIE_OOPS, "bus error", regs, 0, current->thread.trap_nr,
|
|
SIGBUS) == NOTIFY_STOP)
|
|
goto out;
|
|
|
|
die_if_kernel("Oops", regs);
|
|
force_sig(SIGBUS);
|
|
|
|
out:
|
|
exception_exit(prev_state);
|
|
}
|
|
|
|
/*
|
|
* ll/sc, rdhwr, sync emulation
|
|
*/
|
|
|
|
#define OPCODE 0xfc000000
|
|
#define BASE 0x03e00000
|
|
#define RT 0x001f0000
|
|
#define OFFSET 0x0000ffff
|
|
#define LL 0xc0000000
|
|
#define SC 0xe0000000
|
|
#define SPEC0 0x00000000
|
|
#define SPEC3 0x7c000000
|
|
#define RD 0x0000f800
|
|
#define FUNC 0x0000003f
|
|
#define SYNC 0x0000000f
|
|
#define RDHWR 0x0000003b
|
|
|
|
/* microMIPS definitions */
|
|
#define MM_POOL32A_FUNC 0xfc00ffff
|
|
#define MM_RDHWR 0x00006b3c
|
|
#define MM_RS 0x001f0000
|
|
#define MM_RT 0x03e00000
|
|
|
|
/*
|
|
* The ll_bit is cleared by r*_switch.S
|
|
*/
|
|
|
|
unsigned int ll_bit;
|
|
struct task_struct *ll_task;
|
|
|
|
static inline int simulate_ll(struct pt_regs *regs, unsigned int opcode)
|
|
{
|
|
unsigned long value, __user *vaddr;
|
|
long offset;
|
|
|
|
/*
|
|
* analyse the ll instruction that just caused a ri exception
|
|
* and put the referenced address to addr.
|
|
*/
|
|
|
|
/* sign extend offset */
|
|
offset = opcode & OFFSET;
|
|
offset <<= 16;
|
|
offset >>= 16;
|
|
|
|
vaddr = (unsigned long __user *)
|
|
((unsigned long)(regs->regs[(opcode & BASE) >> 21]) + offset);
|
|
|
|
if ((unsigned long)vaddr & 3)
|
|
return SIGBUS;
|
|
if (get_user(value, vaddr))
|
|
return SIGSEGV;
|
|
|
|
preempt_disable();
|
|
|
|
if (ll_task == NULL || ll_task == current) {
|
|
ll_bit = 1;
|
|
} else {
|
|
ll_bit = 0;
|
|
}
|
|
ll_task = current;
|
|
|
|
preempt_enable();
|
|
|
|
regs->regs[(opcode & RT) >> 16] = value;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static inline int simulate_sc(struct pt_regs *regs, unsigned int opcode)
|
|
{
|
|
unsigned long __user *vaddr;
|
|
unsigned long reg;
|
|
long offset;
|
|
|
|
/*
|
|
* analyse the sc instruction that just caused a ri exception
|
|
* and put the referenced address to addr.
|
|
*/
|
|
|
|
/* sign extend offset */
|
|
offset = opcode & OFFSET;
|
|
offset <<= 16;
|
|
offset >>= 16;
|
|
|
|
vaddr = (unsigned long __user *)
|
|
((unsigned long)(regs->regs[(opcode & BASE) >> 21]) + offset);
|
|
reg = (opcode & RT) >> 16;
|
|
|
|
if ((unsigned long)vaddr & 3)
|
|
return SIGBUS;
|
|
|
|
preempt_disable();
|
|
|
|
if (ll_bit == 0 || ll_task != current) {
|
|
regs->regs[reg] = 0;
|
|
preempt_enable();
|
|
return 0;
|
|
}
|
|
|
|
preempt_enable();
|
|
|
|
if (put_user(regs->regs[reg], vaddr))
|
|
return SIGSEGV;
|
|
|
|
regs->regs[reg] = 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* ll uses the opcode of lwc0 and sc uses the opcode of swc0. That is both
|
|
* opcodes are supposed to result in coprocessor unusable exceptions if
|
|
* executed on ll/sc-less processors. That's the theory. In practice a
|
|
* few processors such as NEC's VR4100 throw reserved instruction exceptions
|
|
* instead, so we're doing the emulation thing in both exception handlers.
|
|
*/
|
|
static int simulate_llsc(struct pt_regs *regs, unsigned int opcode)
|
|
{
|
|
if ((opcode & OPCODE) == LL) {
|
|
perf_sw_event(PERF_COUNT_SW_EMULATION_FAULTS,
|
|
1, regs, 0);
|
|
return simulate_ll(regs, opcode);
|
|
}
|
|
if ((opcode & OPCODE) == SC) {
|
|
perf_sw_event(PERF_COUNT_SW_EMULATION_FAULTS,
|
|
1, regs, 0);
|
|
return simulate_sc(regs, opcode);
|
|
}
|
|
|
|
return -1; /* Must be something else ... */
|
|
}
|
|
|
|
/*
|
|
* Simulate trapping 'rdhwr' instructions to provide user accessible
|
|
* registers not implemented in hardware.
|
|
*/
|
|
static int simulate_rdhwr(struct pt_regs *regs, int rd, int rt)
|
|
{
|
|
struct thread_info *ti = task_thread_info(current);
|
|
|
|
perf_sw_event(PERF_COUNT_SW_EMULATION_FAULTS,
|
|
1, regs, 0);
|
|
switch (rd) {
|
|
case MIPS_HWR_CPUNUM: /* CPU number */
|
|
regs->regs[rt] = smp_processor_id();
|
|
return 0;
|
|
case MIPS_HWR_SYNCISTEP: /* SYNCI length */
|
|
regs->regs[rt] = min(current_cpu_data.dcache.linesz,
|
|
current_cpu_data.icache.linesz);
|
|
return 0;
|
|
case MIPS_HWR_CC: /* Read count register */
|
|
regs->regs[rt] = read_c0_count();
|
|
return 0;
|
|
case MIPS_HWR_CCRES: /* Count register resolution */
|
|
switch (current_cpu_type()) {
|
|
case CPU_20KC:
|
|
case CPU_25KF:
|
|
regs->regs[rt] = 1;
|
|
break;
|
|
default:
|
|
regs->regs[rt] = 2;
|
|
}
|
|
return 0;
|
|
case MIPS_HWR_ULR: /* Read UserLocal register */
|
|
regs->regs[rt] = ti->tp_value;
|
|
return 0;
|
|
default:
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
static int simulate_rdhwr_normal(struct pt_regs *regs, unsigned int opcode)
|
|
{
|
|
if ((opcode & OPCODE) == SPEC3 && (opcode & FUNC) == RDHWR) {
|
|
int rd = (opcode & RD) >> 11;
|
|
int rt = (opcode & RT) >> 16;
|
|
|
|
simulate_rdhwr(regs, rd, rt);
|
|
return 0;
|
|
}
|
|
|
|
/* Not ours. */
|
|
return -1;
|
|
}
|
|
|
|
static int simulate_rdhwr_mm(struct pt_regs *regs, unsigned int opcode)
|
|
{
|
|
if ((opcode & MM_POOL32A_FUNC) == MM_RDHWR) {
|
|
int rd = (opcode & MM_RS) >> 16;
|
|
int rt = (opcode & MM_RT) >> 21;
|
|
simulate_rdhwr(regs, rd, rt);
|
|
return 0;
|
|
}
|
|
|
|
/* Not ours. */
|
|
return -1;
|
|
}
|
|
|
|
static int simulate_sync(struct pt_regs *regs, unsigned int opcode)
|
|
{
|
|
if ((opcode & OPCODE) == SPEC0 && (opcode & FUNC) == SYNC) {
|
|
perf_sw_event(PERF_COUNT_SW_EMULATION_FAULTS,
|
|
1, regs, 0);
|
|
return 0;
|
|
}
|
|
|
|
return -1; /* Must be something else ... */
|
|
}
|
|
|
|
/*
|
|
* Loongson-3 CSR instructions emulation
|
|
*/
|
|
|
|
#ifdef CONFIG_CPU_LOONGSON3_CPUCFG_EMULATION
|
|
|
|
#define LWC2 0xc8000000
|
|
#define RS BASE
|
|
#define CSR_OPCODE2 0x00000118
|
|
#define CSR_OPCODE2_MASK 0x000007ff
|
|
#define CSR_FUNC_MASK RT
|
|
#define CSR_FUNC_CPUCFG 0x8
|
|
|
|
static int simulate_loongson3_cpucfg(struct pt_regs *regs,
|
|
unsigned int opcode)
|
|
{
|
|
int op = opcode & OPCODE;
|
|
int op2 = opcode & CSR_OPCODE2_MASK;
|
|
int csr_func = (opcode & CSR_FUNC_MASK) >> 16;
|
|
|
|
if (op == LWC2 && op2 == CSR_OPCODE2 && csr_func == CSR_FUNC_CPUCFG) {
|
|
int rd = (opcode & RD) >> 11;
|
|
int rs = (opcode & RS) >> 21;
|
|
__u64 sel = regs->regs[rs];
|
|
|
|
perf_sw_event(PERF_COUNT_SW_EMULATION_FAULTS, 1, regs, 0);
|
|
|
|
/* Do not emulate on unsupported core models. */
|
|
preempt_disable();
|
|
if (!loongson3_cpucfg_emulation_enabled(¤t_cpu_data)) {
|
|
preempt_enable();
|
|
return -1;
|
|
}
|
|
regs->regs[rd] = loongson3_cpucfg_read_synthesized(
|
|
¤t_cpu_data, sel);
|
|
preempt_enable();
|
|
return 0;
|
|
}
|
|
|
|
/* Not ours. */
|
|
return -1;
|
|
}
|
|
#endif /* CONFIG_CPU_LOONGSON3_CPUCFG_EMULATION */
|
|
|
|
asmlinkage void do_ov(struct pt_regs *regs)
|
|
{
|
|
enum ctx_state prev_state;
|
|
|
|
prev_state = exception_enter();
|
|
die_if_kernel("Integer overflow", regs);
|
|
|
|
force_sig_fault(SIGFPE, FPE_INTOVF, (void __user *)regs->cp0_epc);
|
|
exception_exit(prev_state);
|
|
}
|
|
|
|
#ifdef CONFIG_MIPS_FP_SUPPORT
|
|
|
|
/*
|
|
* Send SIGFPE according to FCSR Cause bits, which must have already
|
|
* been masked against Enable bits. This is impotant as Inexact can
|
|
* happen together with Overflow or Underflow, and `ptrace' can set
|
|
* any bits.
|
|
*/
|
|
void force_fcr31_sig(unsigned long fcr31, void __user *fault_addr,
|
|
struct task_struct *tsk)
|
|
{
|
|
int si_code = FPE_FLTUNK;
|
|
|
|
if (fcr31 & FPU_CSR_INV_X)
|
|
si_code = FPE_FLTINV;
|
|
else if (fcr31 & FPU_CSR_DIV_X)
|
|
si_code = FPE_FLTDIV;
|
|
else if (fcr31 & FPU_CSR_OVF_X)
|
|
si_code = FPE_FLTOVF;
|
|
else if (fcr31 & FPU_CSR_UDF_X)
|
|
si_code = FPE_FLTUND;
|
|
else if (fcr31 & FPU_CSR_INE_X)
|
|
si_code = FPE_FLTRES;
|
|
|
|
force_sig_fault_to_task(SIGFPE, si_code, fault_addr, tsk);
|
|
}
|
|
|
|
int process_fpemu_return(int sig, void __user *fault_addr, unsigned long fcr31)
|
|
{
|
|
int si_code;
|
|
|
|
switch (sig) {
|
|
case 0:
|
|
return 0;
|
|
|
|
case SIGFPE:
|
|
force_fcr31_sig(fcr31, fault_addr, current);
|
|
return 1;
|
|
|
|
case SIGBUS:
|
|
force_sig_fault(SIGBUS, BUS_ADRERR, fault_addr);
|
|
return 1;
|
|
|
|
case SIGSEGV:
|
|
mmap_read_lock(current->mm);
|
|
if (vma_lookup(current->mm, (unsigned long)fault_addr))
|
|
si_code = SEGV_ACCERR;
|
|
else
|
|
si_code = SEGV_MAPERR;
|
|
mmap_read_unlock(current->mm);
|
|
force_sig_fault(SIGSEGV, si_code, fault_addr);
|
|
return 1;
|
|
|
|
default:
|
|
force_sig(sig);
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
static int simulate_fp(struct pt_regs *regs, unsigned int opcode,
|
|
unsigned long old_epc, unsigned long old_ra)
|
|
{
|
|
union mips_instruction inst = { .word = opcode };
|
|
void __user *fault_addr;
|
|
unsigned long fcr31;
|
|
int sig;
|
|
|
|
/* If it's obviously not an FP instruction, skip it */
|
|
switch (inst.i_format.opcode) {
|
|
case cop1_op:
|
|
case cop1x_op:
|
|
case lwc1_op:
|
|
case ldc1_op:
|
|
case swc1_op:
|
|
case sdc1_op:
|
|
break;
|
|
|
|
default:
|
|
return -1;
|
|
}
|
|
|
|
/*
|
|
* do_ri skipped over the instruction via compute_return_epc, undo
|
|
* that for the FPU emulator.
|
|
*/
|
|
regs->cp0_epc = old_epc;
|
|
regs->regs[31] = old_ra;
|
|
|
|
/* Run the emulator */
|
|
sig = fpu_emulator_cop1Handler(regs, ¤t->thread.fpu, 1,
|
|
&fault_addr);
|
|
|
|
/*
|
|
* We can't allow the emulated instruction to leave any
|
|
* enabled Cause bits set in $fcr31.
|
|
*/
|
|
fcr31 = mask_fcr31_x(current->thread.fpu.fcr31);
|
|
current->thread.fpu.fcr31 &= ~fcr31;
|
|
|
|
/* Restore the hardware register state */
|
|
own_fpu(1);
|
|
|
|
/* Send a signal if required. */
|
|
process_fpemu_return(sig, fault_addr, fcr31);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* XXX Delayed fp exceptions when doing a lazy ctx switch XXX
|
|
*/
|
|
asmlinkage void do_fpe(struct pt_regs *regs, unsigned long fcr31)
|
|
{
|
|
enum ctx_state prev_state;
|
|
void __user *fault_addr;
|
|
int sig;
|
|
|
|
prev_state = exception_enter();
|
|
if (notify_die(DIE_FP, "FP exception", regs, 0, current->thread.trap_nr,
|
|
SIGFPE) == NOTIFY_STOP)
|
|
goto out;
|
|
|
|
/* Clear FCSR.Cause before enabling interrupts */
|
|
write_32bit_cp1_register(CP1_STATUS, fcr31 & ~mask_fcr31_x(fcr31));
|
|
local_irq_enable();
|
|
|
|
die_if_kernel("FP exception in kernel code", regs);
|
|
|
|
if (fcr31 & FPU_CSR_UNI_X) {
|
|
/*
|
|
* Unimplemented operation exception. If we've got the full
|
|
* software emulator on-board, let's use it...
|
|
*
|
|
* Force FPU to dump state into task/thread context. We're
|
|
* moving a lot of data here for what is probably a single
|
|
* instruction, but the alternative is to pre-decode the FP
|
|
* register operands before invoking the emulator, which seems
|
|
* a bit extreme for what should be an infrequent event.
|
|
*/
|
|
|
|
/* Run the emulator */
|
|
sig = fpu_emulator_cop1Handler(regs, ¤t->thread.fpu, 1,
|
|
&fault_addr);
|
|
|
|
/*
|
|
* We can't allow the emulated instruction to leave any
|
|
* enabled Cause bits set in $fcr31.
|
|
*/
|
|
fcr31 = mask_fcr31_x(current->thread.fpu.fcr31);
|
|
current->thread.fpu.fcr31 &= ~fcr31;
|
|
|
|
/* Restore the hardware register state */
|
|
own_fpu(1); /* Using the FPU again. */
|
|
} else {
|
|
sig = SIGFPE;
|
|
fault_addr = (void __user *) regs->cp0_epc;
|
|
}
|
|
|
|
/* Send a signal if required. */
|
|
process_fpemu_return(sig, fault_addr, fcr31);
|
|
|
|
out:
|
|
exception_exit(prev_state);
|
|
}
|
|
|
|
/*
|
|
* MIPS MT processors may have fewer FPU contexts than CPU threads. If we've
|
|
* emulated more than some threshold number of instructions, force migration to
|
|
* a "CPU" that has FP support.
|
|
*/
|
|
static void mt_ase_fp_affinity(void)
|
|
{
|
|
#ifdef CONFIG_MIPS_MT_FPAFF
|
|
if (mt_fpemul_threshold > 0 &&
|
|
((current->thread.emulated_fp++ > mt_fpemul_threshold))) {
|
|
/*
|
|
* If there's no FPU present, or if the application has already
|
|
* restricted the allowed set to exclude any CPUs with FPUs,
|
|
* we'll skip the procedure.
|
|
*/
|
|
if (cpumask_intersects(¤t->cpus_mask, &mt_fpu_cpumask)) {
|
|
cpumask_t tmask;
|
|
|
|
current->thread.user_cpus_allowed
|
|
= current->cpus_mask;
|
|
cpumask_and(&tmask, ¤t->cpus_mask,
|
|
&mt_fpu_cpumask);
|
|
set_cpus_allowed_ptr(current, &tmask);
|
|
set_thread_flag(TIF_FPUBOUND);
|
|
}
|
|
}
|
|
#endif /* CONFIG_MIPS_MT_FPAFF */
|
|
}
|
|
|
|
#else /* !CONFIG_MIPS_FP_SUPPORT */
|
|
|
|
static int simulate_fp(struct pt_regs *regs, unsigned int opcode,
|
|
unsigned long old_epc, unsigned long old_ra)
|
|
{
|
|
return -1;
|
|
}
|
|
|
|
#endif /* !CONFIG_MIPS_FP_SUPPORT */
|
|
|
|
void do_trap_or_bp(struct pt_regs *regs, unsigned int code, int si_code,
|
|
const char *str)
|
|
{
|
|
char b[40];
|
|
|
|
#ifdef CONFIG_KGDB_LOW_LEVEL_TRAP
|
|
if (kgdb_ll_trap(DIE_TRAP, str, regs, code, current->thread.trap_nr,
|
|
SIGTRAP) == NOTIFY_STOP)
|
|
return;
|
|
#endif /* CONFIG_KGDB_LOW_LEVEL_TRAP */
|
|
|
|
if (notify_die(DIE_TRAP, str, regs, code, current->thread.trap_nr,
|
|
SIGTRAP) == NOTIFY_STOP)
|
|
return;
|
|
|
|
/*
|
|
* A short test says that IRIX 5.3 sends SIGTRAP for all trap
|
|
* insns, even for trap and break codes that indicate arithmetic
|
|
* failures. Weird ...
|
|
* But should we continue the brokenness??? --macro
|
|
*/
|
|
switch (code) {
|
|
case BRK_OVERFLOW:
|
|
case BRK_DIVZERO:
|
|
scnprintf(b, sizeof(b), "%s instruction in kernel code", str);
|
|
die_if_kernel(b, regs);
|
|
force_sig_fault(SIGFPE,
|
|
code == BRK_DIVZERO ? FPE_INTDIV : FPE_INTOVF,
|
|
(void __user *) regs->cp0_epc);
|
|
break;
|
|
case BRK_BUG:
|
|
die_if_kernel("Kernel bug detected", regs);
|
|
force_sig(SIGTRAP);
|
|
break;
|
|
case BRK_MEMU:
|
|
/*
|
|
* This breakpoint code is used by the FPU emulator to retake
|
|
* control of the CPU after executing the instruction from the
|
|
* delay slot of an emulated branch.
|
|
*
|
|
* Terminate if exception was recognized as a delay slot return
|
|
* otherwise handle as normal.
|
|
*/
|
|
if (do_dsemulret(regs))
|
|
return;
|
|
|
|
die_if_kernel("Math emu break/trap", regs);
|
|
force_sig(SIGTRAP);
|
|
break;
|
|
default:
|
|
scnprintf(b, sizeof(b), "%s instruction in kernel code", str);
|
|
die_if_kernel(b, regs);
|
|
if (si_code) {
|
|
force_sig_fault(SIGTRAP, si_code, NULL);
|
|
} else {
|
|
force_sig(SIGTRAP);
|
|
}
|
|
}
|
|
}
|
|
|
|
asmlinkage void do_bp(struct pt_regs *regs)
|
|
{
|
|
unsigned long epc = msk_isa16_mode(exception_epc(regs));
|
|
unsigned int opcode, bcode;
|
|
enum ctx_state prev_state;
|
|
bool user = user_mode(regs);
|
|
|
|
prev_state = exception_enter();
|
|
current->thread.trap_nr = (regs->cp0_cause >> 2) & 0x1f;
|
|
if (get_isa16_mode(regs->cp0_epc)) {
|
|
u16 instr[2];
|
|
|
|
if (__get_inst16(&instr[0], (u16 *)epc, user))
|
|
goto out_sigsegv;
|
|
|
|
if (!cpu_has_mmips) {
|
|
/* MIPS16e mode */
|
|
bcode = (instr[0] >> 5) & 0x3f;
|
|
} else if (mm_insn_16bit(instr[0])) {
|
|
/* 16-bit microMIPS BREAK */
|
|
bcode = instr[0] & 0xf;
|
|
} else {
|
|
/* 32-bit microMIPS BREAK */
|
|
if (__get_inst16(&instr[1], (u16 *)(epc + 2), user))
|
|
goto out_sigsegv;
|
|
opcode = (instr[0] << 16) | instr[1];
|
|
bcode = (opcode >> 6) & ((1 << 20) - 1);
|
|
}
|
|
} else {
|
|
if (__get_inst32(&opcode, (u32 *)epc, user))
|
|
goto out_sigsegv;
|
|
bcode = (opcode >> 6) & ((1 << 20) - 1);
|
|
}
|
|
|
|
/*
|
|
* There is the ancient bug in the MIPS assemblers that the break
|
|
* code starts left to bit 16 instead to bit 6 in the opcode.
|
|
* Gas is bug-compatible, but not always, grrr...
|
|
* We handle both cases with a simple heuristics. --macro
|
|
*/
|
|
if (bcode >= (1 << 10))
|
|
bcode = ((bcode & ((1 << 10) - 1)) << 10) | (bcode >> 10);
|
|
|
|
/*
|
|
* notify the kprobe handlers, if instruction is likely to
|
|
* pertain to them.
|
|
*/
|
|
switch (bcode) {
|
|
case BRK_UPROBE:
|
|
if (notify_die(DIE_UPROBE, "uprobe", regs, bcode,
|
|
current->thread.trap_nr, SIGTRAP) == NOTIFY_STOP)
|
|
goto out;
|
|
else
|
|
break;
|
|
case BRK_UPROBE_XOL:
|
|
if (notify_die(DIE_UPROBE_XOL, "uprobe_xol", regs, bcode,
|
|
current->thread.trap_nr, SIGTRAP) == NOTIFY_STOP)
|
|
goto out;
|
|
else
|
|
break;
|
|
case BRK_KPROBE_BP:
|
|
if (notify_die(DIE_BREAK, "debug", regs, bcode,
|
|
current->thread.trap_nr, SIGTRAP) == NOTIFY_STOP)
|
|
goto out;
|
|
else
|
|
break;
|
|
case BRK_KPROBE_SSTEPBP:
|
|
if (notify_die(DIE_SSTEPBP, "single_step", regs, bcode,
|
|
current->thread.trap_nr, SIGTRAP) == NOTIFY_STOP)
|
|
goto out;
|
|
else
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
do_trap_or_bp(regs, bcode, TRAP_BRKPT, "Break");
|
|
|
|
out:
|
|
exception_exit(prev_state);
|
|
return;
|
|
|
|
out_sigsegv:
|
|
force_sig(SIGSEGV);
|
|
goto out;
|
|
}
|
|
|
|
asmlinkage void do_tr(struct pt_regs *regs)
|
|
{
|
|
u32 opcode, tcode = 0;
|
|
enum ctx_state prev_state;
|
|
u16 instr[2];
|
|
bool user = user_mode(regs);
|
|
unsigned long epc = msk_isa16_mode(exception_epc(regs));
|
|
|
|
prev_state = exception_enter();
|
|
current->thread.trap_nr = (regs->cp0_cause >> 2) & 0x1f;
|
|
if (get_isa16_mode(regs->cp0_epc)) {
|
|
if (__get_inst16(&instr[0], (u16 *)(epc + 0), user) ||
|
|
__get_inst16(&instr[1], (u16 *)(epc + 2), user))
|
|
goto out_sigsegv;
|
|
opcode = (instr[0] << 16) | instr[1];
|
|
/* Immediate versions don't provide a code. */
|
|
if (!(opcode & OPCODE))
|
|
tcode = (opcode >> 12) & ((1 << 4) - 1);
|
|
} else {
|
|
if (__get_inst32(&opcode, (u32 *)epc, user))
|
|
goto out_sigsegv;
|
|
/* Immediate versions don't provide a code. */
|
|
if (!(opcode & OPCODE))
|
|
tcode = (opcode >> 6) & ((1 << 10) - 1);
|
|
}
|
|
|
|
do_trap_or_bp(regs, tcode, 0, "Trap");
|
|
|
|
out:
|
|
exception_exit(prev_state);
|
|
return;
|
|
|
|
out_sigsegv:
|
|
force_sig(SIGSEGV);
|
|
goto out;
|
|
}
|
|
|
|
asmlinkage void do_ri(struct pt_regs *regs)
|
|
{
|
|
unsigned int __user *epc = (unsigned int __user *)exception_epc(regs);
|
|
unsigned long old_epc = regs->cp0_epc;
|
|
unsigned long old31 = regs->regs[31];
|
|
enum ctx_state prev_state;
|
|
unsigned int opcode = 0;
|
|
int status = -1;
|
|
|
|
/*
|
|
* Avoid any kernel code. Just emulate the R2 instruction
|
|
* as quickly as possible.
|
|
*/
|
|
if (mipsr2_emulation && cpu_has_mips_r6 &&
|
|
likely(user_mode(regs)) &&
|
|
likely(get_user(opcode, epc) >= 0)) {
|
|
unsigned long fcr31 = 0;
|
|
|
|
status = mipsr2_decoder(regs, opcode, &fcr31);
|
|
switch (status) {
|
|
case 0:
|
|
case SIGEMT:
|
|
return;
|
|
case SIGILL:
|
|
goto no_r2_instr;
|
|
default:
|
|
process_fpemu_return(status,
|
|
¤t->thread.cp0_baduaddr,
|
|
fcr31);
|
|
return;
|
|
}
|
|
}
|
|
|
|
no_r2_instr:
|
|
|
|
prev_state = exception_enter();
|
|
current->thread.trap_nr = (regs->cp0_cause >> 2) & 0x1f;
|
|
|
|
if (notify_die(DIE_RI, "RI Fault", regs, 0, current->thread.trap_nr,
|
|
SIGILL) == NOTIFY_STOP)
|
|
goto out;
|
|
|
|
die_if_kernel("Reserved instruction in kernel code", regs);
|
|
|
|
if (unlikely(compute_return_epc(regs) < 0))
|
|
goto out;
|
|
|
|
if (!get_isa16_mode(regs->cp0_epc)) {
|
|
if (unlikely(get_user(opcode, epc) < 0))
|
|
status = SIGSEGV;
|
|
|
|
if (!cpu_has_llsc && status < 0)
|
|
status = simulate_llsc(regs, opcode);
|
|
|
|
if (status < 0)
|
|
status = simulate_rdhwr_normal(regs, opcode);
|
|
|
|
if (status < 0)
|
|
status = simulate_sync(regs, opcode);
|
|
|
|
if (status < 0)
|
|
status = simulate_fp(regs, opcode, old_epc, old31);
|
|
|
|
#ifdef CONFIG_CPU_LOONGSON3_CPUCFG_EMULATION
|
|
if (status < 0)
|
|
status = simulate_loongson3_cpucfg(regs, opcode);
|
|
#endif
|
|
} else if (cpu_has_mmips) {
|
|
unsigned short mmop[2] = { 0 };
|
|
|
|
if (unlikely(get_user(mmop[0], (u16 __user *)epc + 0) < 0))
|
|
status = SIGSEGV;
|
|
if (unlikely(get_user(mmop[1], (u16 __user *)epc + 1) < 0))
|
|
status = SIGSEGV;
|
|
opcode = mmop[0];
|
|
opcode = (opcode << 16) | mmop[1];
|
|
|
|
if (status < 0)
|
|
status = simulate_rdhwr_mm(regs, opcode);
|
|
}
|
|
|
|
if (status < 0)
|
|
status = SIGILL;
|
|
|
|
if (unlikely(status > 0)) {
|
|
regs->cp0_epc = old_epc; /* Undo skip-over. */
|
|
regs->regs[31] = old31;
|
|
force_sig(status);
|
|
}
|
|
|
|
out:
|
|
exception_exit(prev_state);
|
|
}
|
|
|
|
/*
|
|
* No lock; only written during early bootup by CPU 0.
|
|
*/
|
|
static RAW_NOTIFIER_HEAD(cu2_chain);
|
|
|
|
int __ref register_cu2_notifier(struct notifier_block *nb)
|
|
{
|
|
return raw_notifier_chain_register(&cu2_chain, nb);
|
|
}
|
|
|
|
int cu2_notifier_call_chain(unsigned long val, void *v)
|
|
{
|
|
return raw_notifier_call_chain(&cu2_chain, val, v);
|
|
}
|
|
|
|
static int default_cu2_call(struct notifier_block *nfb, unsigned long action,
|
|
void *data)
|
|
{
|
|
struct pt_regs *regs = data;
|
|
|
|
die_if_kernel("COP2: Unhandled kernel unaligned access or invalid "
|
|
"instruction", regs);
|
|
force_sig(SIGILL);
|
|
|
|
return NOTIFY_OK;
|
|
}
|
|
|
|
#ifdef CONFIG_MIPS_FP_SUPPORT
|
|
|
|
static int enable_restore_fp_context(int msa)
|
|
{
|
|
int err, was_fpu_owner, prior_msa;
|
|
bool first_fp;
|
|
|
|
/* Initialize context if it hasn't been used already */
|
|
first_fp = init_fp_ctx(current);
|
|
|
|
if (first_fp) {
|
|
preempt_disable();
|
|
err = own_fpu_inatomic(1);
|
|
if (msa && !err) {
|
|
enable_msa();
|
|
/*
|
|
* with MSA enabled, userspace can see MSACSR
|
|
* and MSA regs, but the values in them are from
|
|
* other task before current task, restore them
|
|
* from saved fp/msa context
|
|
*/
|
|
write_msa_csr(current->thread.fpu.msacsr);
|
|
/*
|
|
* own_fpu_inatomic(1) just restore low 64bit,
|
|
* fix the high 64bit
|
|
*/
|
|
init_msa_upper();
|
|
set_thread_flag(TIF_USEDMSA);
|
|
set_thread_flag(TIF_MSA_CTX_LIVE);
|
|
}
|
|
preempt_enable();
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* This task has formerly used the FP context.
|
|
*
|
|
* If this thread has no live MSA vector context then we can simply
|
|
* restore the scalar FP context. If it has live MSA vector context
|
|
* (that is, it has or may have used MSA since last performing a
|
|
* function call) then we'll need to restore the vector context. This
|
|
* applies even if we're currently only executing a scalar FP
|
|
* instruction. This is because if we were to later execute an MSA
|
|
* instruction then we'd either have to:
|
|
*
|
|
* - Restore the vector context & clobber any registers modified by
|
|
* scalar FP instructions between now & then.
|
|
*
|
|
* or
|
|
*
|
|
* - Not restore the vector context & lose the most significant bits
|
|
* of all vector registers.
|
|
*
|
|
* Neither of those options is acceptable. We cannot restore the least
|
|
* significant bits of the registers now & only restore the most
|
|
* significant bits later because the most significant bits of any
|
|
* vector registers whose aliased FP register is modified now will have
|
|
* been zeroed. We'd have no way to know that when restoring the vector
|
|
* context & thus may load an outdated value for the most significant
|
|
* bits of a vector register.
|
|
*/
|
|
if (!msa && !thread_msa_context_live())
|
|
return own_fpu(1);
|
|
|
|
/*
|
|
* This task is using or has previously used MSA. Thus we require
|
|
* that Status.FR == 1.
|
|
*/
|
|
preempt_disable();
|
|
was_fpu_owner = is_fpu_owner();
|
|
err = own_fpu_inatomic(0);
|
|
if (err)
|
|
goto out;
|
|
|
|
enable_msa();
|
|
write_msa_csr(current->thread.fpu.msacsr);
|
|
set_thread_flag(TIF_USEDMSA);
|
|
|
|
/*
|
|
* If this is the first time that the task is using MSA and it has
|
|
* previously used scalar FP in this time slice then we already nave
|
|
* FP context which we shouldn't clobber. We do however need to clear
|
|
* the upper 64b of each vector register so that this task has no
|
|
* opportunity to see data left behind by another.
|
|
*/
|
|
prior_msa = test_and_set_thread_flag(TIF_MSA_CTX_LIVE);
|
|
if (!prior_msa && was_fpu_owner) {
|
|
init_msa_upper();
|
|
|
|
goto out;
|
|
}
|
|
|
|
if (!prior_msa) {
|
|
/*
|
|
* Restore the least significant 64b of each vector register
|
|
* from the existing scalar FP context.
|
|
*/
|
|
_restore_fp(current);
|
|
|
|
/*
|
|
* The task has not formerly used MSA, so clear the upper 64b
|
|
* of each vector register such that it cannot see data left
|
|
* behind by another task.
|
|
*/
|
|
init_msa_upper();
|
|
} else {
|
|
/* We need to restore the vector context. */
|
|
restore_msa(current);
|
|
|
|
/* Restore the scalar FP control & status register */
|
|
if (!was_fpu_owner)
|
|
write_32bit_cp1_register(CP1_STATUS,
|
|
current->thread.fpu.fcr31);
|
|
}
|
|
|
|
out:
|
|
preempt_enable();
|
|
|
|
return 0;
|
|
}
|
|
|
|
#else /* !CONFIG_MIPS_FP_SUPPORT */
|
|
|
|
static int enable_restore_fp_context(int msa)
|
|
{
|
|
return SIGILL;
|
|
}
|
|
|
|
#endif /* CONFIG_MIPS_FP_SUPPORT */
|
|
|
|
asmlinkage void do_cpu(struct pt_regs *regs)
|
|
{
|
|
enum ctx_state prev_state;
|
|
unsigned int __user *epc;
|
|
unsigned long old_epc, old31;
|
|
unsigned int opcode;
|
|
unsigned int cpid;
|
|
int status;
|
|
|
|
prev_state = exception_enter();
|
|
cpid = (regs->cp0_cause >> CAUSEB_CE) & 3;
|
|
|
|
if (cpid != 2)
|
|
die_if_kernel("do_cpu invoked from kernel context!", regs);
|
|
|
|
switch (cpid) {
|
|
case 0:
|
|
epc = (unsigned int __user *)exception_epc(regs);
|
|
old_epc = regs->cp0_epc;
|
|
old31 = regs->regs[31];
|
|
opcode = 0;
|
|
status = -1;
|
|
|
|
if (unlikely(compute_return_epc(regs) < 0))
|
|
break;
|
|
|
|
if (!get_isa16_mode(regs->cp0_epc)) {
|
|
if (unlikely(get_user(opcode, epc) < 0))
|
|
status = SIGSEGV;
|
|
|
|
if (!cpu_has_llsc && status < 0)
|
|
status = simulate_llsc(regs, opcode);
|
|
}
|
|
|
|
if (status < 0)
|
|
status = SIGILL;
|
|
|
|
if (unlikely(status > 0)) {
|
|
regs->cp0_epc = old_epc; /* Undo skip-over. */
|
|
regs->regs[31] = old31;
|
|
force_sig(status);
|
|
}
|
|
|
|
break;
|
|
|
|
#ifdef CONFIG_MIPS_FP_SUPPORT
|
|
case 3:
|
|
/*
|
|
* The COP3 opcode space and consequently the CP0.Status.CU3
|
|
* bit and the CP0.Cause.CE=3 encoding have been removed as
|
|
* of the MIPS III ISA. From the MIPS IV and MIPS32r2 ISAs
|
|
* up the space has been reused for COP1X instructions, that
|
|
* are enabled by the CP0.Status.CU1 bit and consequently
|
|
* use the CP0.Cause.CE=1 encoding for Coprocessor Unusable
|
|
* exceptions. Some FPU-less processors that implement one
|
|
* of these ISAs however use this code erroneously for COP1X
|
|
* instructions. Therefore we redirect this trap to the FP
|
|
* emulator too.
|
|
*/
|
|
if (raw_cpu_has_fpu || !cpu_has_mips_4_5_64_r2_r6) {
|
|
force_sig(SIGILL);
|
|
break;
|
|
}
|
|
fallthrough;
|
|
case 1: {
|
|
void __user *fault_addr;
|
|
unsigned long fcr31;
|
|
int err, sig;
|
|
|
|
err = enable_restore_fp_context(0);
|
|
|
|
if (raw_cpu_has_fpu && !err)
|
|
break;
|
|
|
|
sig = fpu_emulator_cop1Handler(regs, ¤t->thread.fpu, 0,
|
|
&fault_addr);
|
|
|
|
/*
|
|
* We can't allow the emulated instruction to leave
|
|
* any enabled Cause bits set in $fcr31.
|
|
*/
|
|
fcr31 = mask_fcr31_x(current->thread.fpu.fcr31);
|
|
current->thread.fpu.fcr31 &= ~fcr31;
|
|
|
|
/* Send a signal if required. */
|
|
if (!process_fpemu_return(sig, fault_addr, fcr31) && !err)
|
|
mt_ase_fp_affinity();
|
|
|
|
break;
|
|
}
|
|
#else /* CONFIG_MIPS_FP_SUPPORT */
|
|
case 1:
|
|
case 3:
|
|
force_sig(SIGILL);
|
|
break;
|
|
#endif /* CONFIG_MIPS_FP_SUPPORT */
|
|
|
|
case 2:
|
|
raw_notifier_call_chain(&cu2_chain, CU2_EXCEPTION, regs);
|
|
break;
|
|
}
|
|
|
|
exception_exit(prev_state);
|
|
}
|
|
|
|
asmlinkage void do_msa_fpe(struct pt_regs *regs, unsigned int msacsr)
|
|
{
|
|
enum ctx_state prev_state;
|
|
|
|
prev_state = exception_enter();
|
|
current->thread.trap_nr = (regs->cp0_cause >> 2) & 0x1f;
|
|
if (notify_die(DIE_MSAFP, "MSA FP exception", regs, 0,
|
|
current->thread.trap_nr, SIGFPE) == NOTIFY_STOP)
|
|
goto out;
|
|
|
|
/* Clear MSACSR.Cause before enabling interrupts */
|
|
write_msa_csr(msacsr & ~MSA_CSR_CAUSEF);
|
|
local_irq_enable();
|
|
|
|
die_if_kernel("do_msa_fpe invoked from kernel context!", regs);
|
|
force_sig(SIGFPE);
|
|
out:
|
|
exception_exit(prev_state);
|
|
}
|
|
|
|
asmlinkage void do_msa(struct pt_regs *regs)
|
|
{
|
|
enum ctx_state prev_state;
|
|
int err;
|
|
|
|
prev_state = exception_enter();
|
|
|
|
if (!cpu_has_msa || test_thread_flag(TIF_32BIT_FPREGS)) {
|
|
force_sig(SIGILL);
|
|
goto out;
|
|
}
|
|
|
|
die_if_kernel("do_msa invoked from kernel context!", regs);
|
|
|
|
err = enable_restore_fp_context(1);
|
|
if (err)
|
|
force_sig(SIGILL);
|
|
out:
|
|
exception_exit(prev_state);
|
|
}
|
|
|
|
asmlinkage void do_mdmx(struct pt_regs *regs)
|
|
{
|
|
enum ctx_state prev_state;
|
|
|
|
prev_state = exception_enter();
|
|
force_sig(SIGILL);
|
|
exception_exit(prev_state);
|
|
}
|
|
|
|
/*
|
|
* Called with interrupts disabled.
|
|
*/
|
|
asmlinkage void do_watch(struct pt_regs *regs)
|
|
{
|
|
enum ctx_state prev_state;
|
|
|
|
prev_state = exception_enter();
|
|
/*
|
|
* Clear WP (bit 22) bit of cause register so we don't loop
|
|
* forever.
|
|
*/
|
|
clear_c0_cause(CAUSEF_WP);
|
|
|
|
/*
|
|
* If the current thread has the watch registers loaded, save
|
|
* their values and send SIGTRAP. Otherwise another thread
|
|
* left the registers set, clear them and continue.
|
|
*/
|
|
if (test_tsk_thread_flag(current, TIF_LOAD_WATCH)) {
|
|
mips_read_watch_registers();
|
|
local_irq_enable();
|
|
force_sig_fault(SIGTRAP, TRAP_HWBKPT, NULL);
|
|
} else {
|
|
mips_clear_watch_registers();
|
|
local_irq_enable();
|
|
}
|
|
exception_exit(prev_state);
|
|
}
|
|
|
|
asmlinkage void do_mcheck(struct pt_regs *regs)
|
|
{
|
|
int multi_match = regs->cp0_status & ST0_TS;
|
|
enum ctx_state prev_state;
|
|
|
|
prev_state = exception_enter();
|
|
show_regs(regs);
|
|
|
|
if (multi_match) {
|
|
dump_tlb_regs();
|
|
pr_info("\n");
|
|
dump_tlb_all();
|
|
}
|
|
|
|
show_code((void *)regs->cp0_epc, user_mode(regs));
|
|
|
|
/*
|
|
* Some chips may have other causes of machine check (e.g. SB1
|
|
* graduation timer)
|
|
*/
|
|
panic("Caught Machine Check exception - %scaused by multiple "
|
|
"matching entries in the TLB.",
|
|
(multi_match) ? "" : "not ");
|
|
}
|
|
|
|
asmlinkage void do_mt(struct pt_regs *regs)
|
|
{
|
|
int subcode;
|
|
|
|
subcode = (read_vpe_c0_vpecontrol() & VPECONTROL_EXCPT)
|
|
>> VPECONTROL_EXCPT_SHIFT;
|
|
switch (subcode) {
|
|
case 0:
|
|
printk(KERN_DEBUG "Thread Underflow\n");
|
|
break;
|
|
case 1:
|
|
printk(KERN_DEBUG "Thread Overflow\n");
|
|
break;
|
|
case 2:
|
|
printk(KERN_DEBUG "Invalid YIELD Qualifier\n");
|
|
break;
|
|
case 3:
|
|
printk(KERN_DEBUG "Gating Storage Exception\n");
|
|
break;
|
|
case 4:
|
|
printk(KERN_DEBUG "YIELD Scheduler Exception\n");
|
|
break;
|
|
case 5:
|
|
printk(KERN_DEBUG "Gating Storage Scheduler Exception\n");
|
|
break;
|
|
default:
|
|
printk(KERN_DEBUG "*** UNKNOWN THREAD EXCEPTION %d ***\n",
|
|
subcode);
|
|
break;
|
|
}
|
|
die_if_kernel("MIPS MT Thread exception in kernel", regs);
|
|
|
|
force_sig(SIGILL);
|
|
}
|
|
|
|
|
|
asmlinkage void do_dsp(struct pt_regs *regs)
|
|
{
|
|
if (cpu_has_dsp)
|
|
panic("Unexpected DSP exception");
|
|
|
|
force_sig(SIGILL);
|
|
}
|
|
|
|
asmlinkage void do_reserved(struct pt_regs *regs)
|
|
{
|
|
/*
|
|
* Game over - no way to handle this if it ever occurs. Most probably
|
|
* caused by a new unknown cpu type or after another deadly
|
|
* hard/software error.
|
|
*/
|
|
show_regs(regs);
|
|
panic("Caught reserved exception %ld - should not happen.",
|
|
(regs->cp0_cause & 0x7f) >> 2);
|
|
}
|
|
|
|
static int __initdata l1parity = 1;
|
|
static int __init nol1parity(char *s)
|
|
{
|
|
l1parity = 0;
|
|
return 1;
|
|
}
|
|
__setup("nol1par", nol1parity);
|
|
static int __initdata l2parity = 1;
|
|
static int __init nol2parity(char *s)
|
|
{
|
|
l2parity = 0;
|
|
return 1;
|
|
}
|
|
__setup("nol2par", nol2parity);
|
|
|
|
/*
|
|
* Some MIPS CPUs can enable/disable for cache parity detection, but do
|
|
* it different ways.
|
|
*/
|
|
static inline __init void parity_protection_init(void)
|
|
{
|
|
#define ERRCTL_PE 0x80000000
|
|
#define ERRCTL_L2P 0x00800000
|
|
|
|
if (mips_cm_revision() >= CM_REV_CM3) {
|
|
ulong gcr_ectl, cp0_ectl;
|
|
|
|
/*
|
|
* With CM3 systems we need to ensure that the L1 & L2
|
|
* parity enables are set to the same value, since this
|
|
* is presumed by the hardware engineers.
|
|
*
|
|
* If the user disabled either of L1 or L2 ECC checking,
|
|
* disable both.
|
|
*/
|
|
l1parity &= l2parity;
|
|
l2parity &= l1parity;
|
|
|
|
/* Probe L1 ECC support */
|
|
cp0_ectl = read_c0_ecc();
|
|
write_c0_ecc(cp0_ectl | ERRCTL_PE);
|
|
back_to_back_c0_hazard();
|
|
cp0_ectl = read_c0_ecc();
|
|
|
|
/* Probe L2 ECC support */
|
|
gcr_ectl = read_gcr_err_control();
|
|
|
|
if (!(gcr_ectl & CM_GCR_ERR_CONTROL_L2_ECC_SUPPORT) ||
|
|
!(cp0_ectl & ERRCTL_PE)) {
|
|
/*
|
|
* One of L1 or L2 ECC checking isn't supported,
|
|
* so we cannot enable either.
|
|
*/
|
|
l1parity = l2parity = 0;
|
|
}
|
|
|
|
/* Configure L1 ECC checking */
|
|
if (l1parity)
|
|
cp0_ectl |= ERRCTL_PE;
|
|
else
|
|
cp0_ectl &= ~ERRCTL_PE;
|
|
write_c0_ecc(cp0_ectl);
|
|
back_to_back_c0_hazard();
|
|
WARN_ON(!!(read_c0_ecc() & ERRCTL_PE) != l1parity);
|
|
|
|
/* Configure L2 ECC checking */
|
|
if (l2parity)
|
|
gcr_ectl |= CM_GCR_ERR_CONTROL_L2_ECC_EN;
|
|
else
|
|
gcr_ectl &= ~CM_GCR_ERR_CONTROL_L2_ECC_EN;
|
|
write_gcr_err_control(gcr_ectl);
|
|
gcr_ectl = read_gcr_err_control();
|
|
gcr_ectl &= CM_GCR_ERR_CONTROL_L2_ECC_EN;
|
|
WARN_ON(!!gcr_ectl != l2parity);
|
|
|
|
pr_info("Cache parity protection %sabled\n",
|
|
l1parity ? "en" : "dis");
|
|
return;
|
|
}
|
|
|
|
switch (current_cpu_type()) {
|
|
case CPU_24K:
|
|
case CPU_34K:
|
|
case CPU_74K:
|
|
case CPU_1004K:
|
|
case CPU_1074K:
|
|
case CPU_INTERAPTIV:
|
|
case CPU_PROAPTIV:
|
|
case CPU_P5600:
|
|
case CPU_QEMU_GENERIC:
|
|
case CPU_P6600:
|
|
{
|
|
unsigned long errctl;
|
|
unsigned int l1parity_present, l2parity_present;
|
|
|
|
errctl = read_c0_ecc();
|
|
errctl &= ~(ERRCTL_PE|ERRCTL_L2P);
|
|
|
|
/* probe L1 parity support */
|
|
write_c0_ecc(errctl | ERRCTL_PE);
|
|
back_to_back_c0_hazard();
|
|
l1parity_present = (read_c0_ecc() & ERRCTL_PE);
|
|
|
|
/* probe L2 parity support */
|
|
write_c0_ecc(errctl|ERRCTL_L2P);
|
|
back_to_back_c0_hazard();
|
|
l2parity_present = (read_c0_ecc() & ERRCTL_L2P);
|
|
|
|
if (l1parity_present && l2parity_present) {
|
|
if (l1parity)
|
|
errctl |= ERRCTL_PE;
|
|
if (l1parity ^ l2parity)
|
|
errctl |= ERRCTL_L2P;
|
|
} else if (l1parity_present) {
|
|
if (l1parity)
|
|
errctl |= ERRCTL_PE;
|
|
} else if (l2parity_present) {
|
|
if (l2parity)
|
|
errctl |= ERRCTL_L2P;
|
|
} else {
|
|
/* No parity available */
|
|
}
|
|
|
|
printk(KERN_INFO "Writing ErrCtl register=%08lx\n", errctl);
|
|
|
|
write_c0_ecc(errctl);
|
|
back_to_back_c0_hazard();
|
|
errctl = read_c0_ecc();
|
|
printk(KERN_INFO "Readback ErrCtl register=%08lx\n", errctl);
|
|
|
|
if (l1parity_present)
|
|
printk(KERN_INFO "Cache parity protection %sabled\n",
|
|
(errctl & ERRCTL_PE) ? "en" : "dis");
|
|
|
|
if (l2parity_present) {
|
|
if (l1parity_present && l1parity)
|
|
errctl ^= ERRCTL_L2P;
|
|
printk(KERN_INFO "L2 cache parity protection %sabled\n",
|
|
(errctl & ERRCTL_L2P) ? "en" : "dis");
|
|
}
|
|
}
|
|
break;
|
|
|
|
case CPU_5KC:
|
|
case CPU_5KE:
|
|
case CPU_LOONGSON32:
|
|
write_c0_ecc(0x80000000);
|
|
back_to_back_c0_hazard();
|
|
/* Set the PE bit (bit 31) in the c0_errctl register. */
|
|
printk(KERN_INFO "Cache parity protection %sabled\n",
|
|
(read_c0_ecc() & 0x80000000) ? "en" : "dis");
|
|
break;
|
|
case CPU_20KC:
|
|
case CPU_25KF:
|
|
/* Clear the DE bit (bit 16) in the c0_status register. */
|
|
printk(KERN_INFO "Enable cache parity protection for "
|
|
"MIPS 20KC/25KF CPUs.\n");
|
|
clear_c0_status(ST0_DE);
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
asmlinkage void cache_parity_error(void)
|
|
{
|
|
const int field = 2 * sizeof(unsigned long);
|
|
unsigned int reg_val;
|
|
|
|
/* For the moment, report the problem and hang. */
|
|
printk("Cache error exception:\n");
|
|
printk("cp0_errorepc == %0*lx\n", field, read_c0_errorepc());
|
|
reg_val = read_c0_cacheerr();
|
|
printk("c0_cacheerr == %08x\n", reg_val);
|
|
|
|
printk("Decoded c0_cacheerr: %s cache fault in %s reference.\n",
|
|
reg_val & (1<<30) ? "secondary" : "primary",
|
|
reg_val & (1<<31) ? "data" : "insn");
|
|
if ((cpu_has_mips_r2_r6) &&
|
|
((current_cpu_data.processor_id & 0xff0000) == PRID_COMP_MIPS)) {
|
|
pr_err("Error bits: %s%s%s%s%s%s%s%s\n",
|
|
reg_val & (1<<29) ? "ED " : "",
|
|
reg_val & (1<<28) ? "ET " : "",
|
|
reg_val & (1<<27) ? "ES " : "",
|
|
reg_val & (1<<26) ? "EE " : "",
|
|
reg_val & (1<<25) ? "EB " : "",
|
|
reg_val & (1<<24) ? "EI " : "",
|
|
reg_val & (1<<23) ? "E1 " : "",
|
|
reg_val & (1<<22) ? "E0 " : "");
|
|
} else {
|
|
pr_err("Error bits: %s%s%s%s%s%s%s\n",
|
|
reg_val & (1<<29) ? "ED " : "",
|
|
reg_val & (1<<28) ? "ET " : "",
|
|
reg_val & (1<<26) ? "EE " : "",
|
|
reg_val & (1<<25) ? "EB " : "",
|
|
reg_val & (1<<24) ? "EI " : "",
|
|
reg_val & (1<<23) ? "E1 " : "",
|
|
reg_val & (1<<22) ? "E0 " : "");
|
|
}
|
|
printk("IDX: 0x%08x\n", reg_val & ((1<<22)-1));
|
|
|
|
#if defined(CONFIG_CPU_MIPS32) || defined(CONFIG_CPU_MIPS64)
|
|
if (reg_val & (1<<22))
|
|
printk("DErrAddr0: 0x%0*lx\n", field, read_c0_derraddr0());
|
|
|
|
if (reg_val & (1<<23))
|
|
printk("DErrAddr1: 0x%0*lx\n", field, read_c0_derraddr1());
|
|
#endif
|
|
|
|
panic("Can't handle the cache error!");
|
|
}
|
|
|
|
asmlinkage void do_ftlb(void)
|
|
{
|
|
const int field = 2 * sizeof(unsigned long);
|
|
unsigned int reg_val;
|
|
|
|
/* For the moment, report the problem and hang. */
|
|
if ((cpu_has_mips_r2_r6) &&
|
|
(((current_cpu_data.processor_id & 0xff0000) == PRID_COMP_MIPS) ||
|
|
((current_cpu_data.processor_id & 0xff0000) == PRID_COMP_LOONGSON))) {
|
|
pr_err("FTLB error exception, cp0_ecc=0x%08x:\n",
|
|
read_c0_ecc());
|
|
pr_err("cp0_errorepc == %0*lx\n", field, read_c0_errorepc());
|
|
reg_val = read_c0_cacheerr();
|
|
pr_err("c0_cacheerr == %08x\n", reg_val);
|
|
|
|
if ((reg_val & 0xc0000000) == 0xc0000000) {
|
|
pr_err("Decoded c0_cacheerr: FTLB parity error\n");
|
|
} else {
|
|
pr_err("Decoded c0_cacheerr: %s cache fault in %s reference.\n",
|
|
reg_val & (1<<30) ? "secondary" : "primary",
|
|
reg_val & (1<<31) ? "data" : "insn");
|
|
}
|
|
} else {
|
|
pr_err("FTLB error exception\n");
|
|
}
|
|
/* Just print the cacheerr bits for now */
|
|
cache_parity_error();
|
|
}
|
|
|
|
asmlinkage void do_gsexc(struct pt_regs *regs, u32 diag1)
|
|
{
|
|
u32 exccode = (diag1 & LOONGSON_DIAG1_EXCCODE) >>
|
|
LOONGSON_DIAG1_EXCCODE_SHIFT;
|
|
enum ctx_state prev_state;
|
|
|
|
prev_state = exception_enter();
|
|
|
|
switch (exccode) {
|
|
case 0x08:
|
|
/* Undocumented exception, will trigger on certain
|
|
* also-undocumented instructions accessible from userspace.
|
|
* Processor state is not otherwise corrupted, but currently
|
|
* we don't know how to proceed. Maybe there is some
|
|
* undocumented control flag to enable the instructions?
|
|
*/
|
|
force_sig(SIGILL);
|
|
break;
|
|
|
|
default:
|
|
/* None of the other exceptions, documented or not, have
|
|
* further details given; none are encountered in the wild
|
|
* either. Panic in case some of them turn out to be fatal.
|
|
*/
|
|
show_regs(regs);
|
|
panic("Unhandled Loongson exception - GSCause = %08x", diag1);
|
|
}
|
|
|
|
exception_exit(prev_state);
|
|
}
|
|
|
|
/*
|
|
* SDBBP EJTAG debug exception handler.
|
|
* We skip the instruction and return to the next instruction.
|
|
*/
|
|
void ejtag_exception_handler(struct pt_regs *regs)
|
|
{
|
|
const int field = 2 * sizeof(unsigned long);
|
|
unsigned long depc, old_epc, old_ra;
|
|
unsigned int debug;
|
|
|
|
printk(KERN_DEBUG "SDBBP EJTAG debug exception - not handled yet, just ignored!\n");
|
|
depc = read_c0_depc();
|
|
debug = read_c0_debug();
|
|
printk(KERN_DEBUG "c0_depc = %0*lx, DEBUG = %08x\n", field, depc, debug);
|
|
if (debug & 0x80000000) {
|
|
/*
|
|
* In branch delay slot.
|
|
* We cheat a little bit here and use EPC to calculate the
|
|
* debug return address (DEPC). EPC is restored after the
|
|
* calculation.
|
|
*/
|
|
old_epc = regs->cp0_epc;
|
|
old_ra = regs->regs[31];
|
|
regs->cp0_epc = depc;
|
|
compute_return_epc(regs);
|
|
depc = regs->cp0_epc;
|
|
regs->cp0_epc = old_epc;
|
|
regs->regs[31] = old_ra;
|
|
} else
|
|
depc += 4;
|
|
write_c0_depc(depc);
|
|
|
|
#if 0
|
|
printk(KERN_DEBUG "\n\n----- Enable EJTAG single stepping ----\n\n");
|
|
write_c0_debug(debug | 0x100);
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* NMI exception handler.
|
|
* No lock; only written during early bootup by CPU 0.
|
|
*/
|
|
static RAW_NOTIFIER_HEAD(nmi_chain);
|
|
|
|
int register_nmi_notifier(struct notifier_block *nb)
|
|
{
|
|
return raw_notifier_chain_register(&nmi_chain, nb);
|
|
}
|
|
|
|
void __noreturn nmi_exception_handler(struct pt_regs *regs)
|
|
{
|
|
char str[100];
|
|
|
|
nmi_enter();
|
|
raw_notifier_call_chain(&nmi_chain, 0, regs);
|
|
bust_spinlocks(1);
|
|
snprintf(str, 100, "CPU%d NMI taken, CP0_EPC=%lx\n",
|
|
smp_processor_id(), regs->cp0_epc);
|
|
regs->cp0_epc = read_c0_errorepc();
|
|
die(str, regs);
|
|
nmi_exit();
|
|
}
|
|
|
|
unsigned long ebase;
|
|
EXPORT_SYMBOL_GPL(ebase);
|
|
unsigned long exception_handlers[32];
|
|
unsigned long vi_handlers[64];
|
|
|
|
void reserve_exception_space(phys_addr_t addr, unsigned long size)
|
|
{
|
|
memblock_reserve(addr, size);
|
|
}
|
|
|
|
void __init *set_except_vector(int n, void *addr)
|
|
{
|
|
unsigned long handler = (unsigned long) addr;
|
|
unsigned long old_handler;
|
|
|
|
#ifdef CONFIG_CPU_MICROMIPS
|
|
/*
|
|
* Only the TLB handlers are cache aligned with an even
|
|
* address. All other handlers are on an odd address and
|
|
* require no modification. Otherwise, MIPS32 mode will
|
|
* be entered when handling any TLB exceptions. That
|
|
* would be bad...since we must stay in microMIPS mode.
|
|
*/
|
|
if (!(handler & 0x1))
|
|
handler |= 1;
|
|
#endif
|
|
old_handler = xchg(&exception_handlers[n], handler);
|
|
|
|
if (n == 0 && cpu_has_divec) {
|
|
#ifdef CONFIG_CPU_MICROMIPS
|
|
unsigned long jump_mask = ~((1 << 27) - 1);
|
|
#else
|
|
unsigned long jump_mask = ~((1 << 28) - 1);
|
|
#endif
|
|
u32 *buf = (u32 *)(ebase + 0x200);
|
|
unsigned int k0 = 26;
|
|
if ((handler & jump_mask) == ((ebase + 0x200) & jump_mask)) {
|
|
uasm_i_j(&buf, handler & ~jump_mask);
|
|
uasm_i_nop(&buf);
|
|
} else {
|
|
UASM_i_LA(&buf, k0, handler);
|
|
uasm_i_jr(&buf, k0);
|
|
uasm_i_nop(&buf);
|
|
}
|
|
local_flush_icache_range(ebase + 0x200, (unsigned long)buf);
|
|
}
|
|
return (void *)old_handler;
|
|
}
|
|
|
|
static void do_default_vi(void)
|
|
{
|
|
show_regs(get_irq_regs());
|
|
panic("Caught unexpected vectored interrupt.");
|
|
}
|
|
|
|
static void *set_vi_srs_handler(int n, vi_handler_t addr, int srs)
|
|
{
|
|
unsigned long handler;
|
|
unsigned long old_handler = vi_handlers[n];
|
|
int srssets = current_cpu_data.srsets;
|
|
u16 *h;
|
|
unsigned char *b;
|
|
|
|
BUG_ON(!cpu_has_veic && !cpu_has_vint);
|
|
|
|
if (addr == NULL) {
|
|
handler = (unsigned long) do_default_vi;
|
|
srs = 0;
|
|
} else
|
|
handler = (unsigned long) addr;
|
|
vi_handlers[n] = handler;
|
|
|
|
b = (unsigned char *)(ebase + 0x200 + n*VECTORSPACING);
|
|
|
|
if (srs >= srssets)
|
|
panic("Shadow register set %d not supported", srs);
|
|
|
|
if (cpu_has_veic) {
|
|
if (board_bind_eic_interrupt)
|
|
board_bind_eic_interrupt(n, srs);
|
|
} else if (cpu_has_vint) {
|
|
/* SRSMap is only defined if shadow sets are implemented */
|
|
if (srssets > 1)
|
|
change_c0_srsmap(0xf << n*4, srs << n*4);
|
|
}
|
|
|
|
if (srs == 0) {
|
|
/*
|
|
* If no shadow set is selected then use the default handler
|
|
* that does normal register saving and standard interrupt exit
|
|
*/
|
|
extern char except_vec_vi, except_vec_vi_lui;
|
|
extern char except_vec_vi_ori, except_vec_vi_end;
|
|
extern char rollback_except_vec_vi;
|
|
char *vec_start = using_rollback_handler() ?
|
|
&rollback_except_vec_vi : &except_vec_vi;
|
|
#if defined(CONFIG_CPU_MICROMIPS) || defined(CONFIG_CPU_BIG_ENDIAN)
|
|
const int lui_offset = &except_vec_vi_lui - vec_start + 2;
|
|
const int ori_offset = &except_vec_vi_ori - vec_start + 2;
|
|
#else
|
|
const int lui_offset = &except_vec_vi_lui - vec_start;
|
|
const int ori_offset = &except_vec_vi_ori - vec_start;
|
|
#endif
|
|
const int handler_len = &except_vec_vi_end - vec_start;
|
|
|
|
if (handler_len > VECTORSPACING) {
|
|
/*
|
|
* Sigh... panicing won't help as the console
|
|
* is probably not configured :(
|
|
*/
|
|
panic("VECTORSPACING too small");
|
|
}
|
|
|
|
set_handler(((unsigned long)b - ebase), vec_start,
|
|
#ifdef CONFIG_CPU_MICROMIPS
|
|
(handler_len - 1));
|
|
#else
|
|
handler_len);
|
|
#endif
|
|
h = (u16 *)(b + lui_offset);
|
|
*h = (handler >> 16) & 0xffff;
|
|
h = (u16 *)(b + ori_offset);
|
|
*h = (handler & 0xffff);
|
|
local_flush_icache_range((unsigned long)b,
|
|
(unsigned long)(b+handler_len));
|
|
}
|
|
else {
|
|
/*
|
|
* In other cases jump directly to the interrupt handler. It
|
|
* is the handler's responsibility to save registers if required
|
|
* (eg hi/lo) and return from the exception using "eret".
|
|
*/
|
|
u32 insn;
|
|
|
|
h = (u16 *)b;
|
|
/* j handler */
|
|
#ifdef CONFIG_CPU_MICROMIPS
|
|
insn = 0xd4000000 | (((u32)handler & 0x07ffffff) >> 1);
|
|
#else
|
|
insn = 0x08000000 | (((u32)handler & 0x0fffffff) >> 2);
|
|
#endif
|
|
h[0] = (insn >> 16) & 0xffff;
|
|
h[1] = insn & 0xffff;
|
|
h[2] = 0;
|
|
h[3] = 0;
|
|
local_flush_icache_range((unsigned long)b,
|
|
(unsigned long)(b+8));
|
|
}
|
|
|
|
return (void *)old_handler;
|
|
}
|
|
|
|
void *set_vi_handler(int n, vi_handler_t addr)
|
|
{
|
|
return set_vi_srs_handler(n, addr, 0);
|
|
}
|
|
|
|
extern void tlb_init(void);
|
|
|
|
/*
|
|
* Timer interrupt
|
|
*/
|
|
int cp0_compare_irq;
|
|
EXPORT_SYMBOL_GPL(cp0_compare_irq);
|
|
int cp0_compare_irq_shift;
|
|
|
|
/*
|
|
* Performance counter IRQ or -1 if shared with timer
|
|
*/
|
|
int cp0_perfcount_irq;
|
|
EXPORT_SYMBOL_GPL(cp0_perfcount_irq);
|
|
|
|
/*
|
|
* Fast debug channel IRQ or -1 if not present
|
|
*/
|
|
int cp0_fdc_irq;
|
|
EXPORT_SYMBOL_GPL(cp0_fdc_irq);
|
|
|
|
static int noulri;
|
|
|
|
static int __init ulri_disable(char *s)
|
|
{
|
|
pr_info("Disabling ulri\n");
|
|
noulri = 1;
|
|
|
|
return 1;
|
|
}
|
|
__setup("noulri", ulri_disable);
|
|
|
|
/* configure STATUS register */
|
|
static void configure_status(void)
|
|
{
|
|
/*
|
|
* Disable coprocessors and select 32-bit or 64-bit addressing
|
|
* and the 16/32 or 32/32 FPR register model. Reset the BEV
|
|
* flag that some firmware may have left set and the TS bit (for
|
|
* IP27). Set XX for ISA IV code to work.
|
|
*/
|
|
unsigned int status_set = ST0_KERNEL_CUMASK;
|
|
#ifdef CONFIG_64BIT
|
|
status_set |= ST0_FR|ST0_KX|ST0_SX|ST0_UX;
|
|
#endif
|
|
if (current_cpu_data.isa_level & MIPS_CPU_ISA_IV)
|
|
status_set |= ST0_XX;
|
|
if (cpu_has_dsp)
|
|
status_set |= ST0_MX;
|
|
|
|
change_c0_status(ST0_CU|ST0_MX|ST0_RE|ST0_FR|ST0_BEV|ST0_TS|ST0_KX|ST0_SX|ST0_UX,
|
|
status_set);
|
|
back_to_back_c0_hazard();
|
|
}
|
|
|
|
unsigned int hwrena;
|
|
EXPORT_SYMBOL_GPL(hwrena);
|
|
|
|
/* configure HWRENA register */
|
|
static void configure_hwrena(void)
|
|
{
|
|
hwrena = cpu_hwrena_impl_bits;
|
|
|
|
if (cpu_has_mips_r2_r6)
|
|
hwrena |= MIPS_HWRENA_CPUNUM |
|
|
MIPS_HWRENA_SYNCISTEP |
|
|
MIPS_HWRENA_CC |
|
|
MIPS_HWRENA_CCRES;
|
|
|
|
if (!noulri && cpu_has_userlocal)
|
|
hwrena |= MIPS_HWRENA_ULR;
|
|
|
|
if (hwrena)
|
|
write_c0_hwrena(hwrena);
|
|
}
|
|
|
|
static void configure_exception_vector(void)
|
|
{
|
|
if (cpu_has_mips_r2_r6) {
|
|
unsigned long sr = set_c0_status(ST0_BEV);
|
|
/* If available, use WG to set top bits of EBASE */
|
|
if (cpu_has_ebase_wg) {
|
|
#ifdef CONFIG_64BIT
|
|
write_c0_ebase_64(ebase | MIPS_EBASE_WG);
|
|
#else
|
|
write_c0_ebase(ebase | MIPS_EBASE_WG);
|
|
#endif
|
|
}
|
|
write_c0_ebase(ebase);
|
|
write_c0_status(sr);
|
|
}
|
|
if (cpu_has_veic || cpu_has_vint) {
|
|
/* Setting vector spacing enables EI/VI mode */
|
|
change_c0_intctl(0x3e0, VECTORSPACING);
|
|
}
|
|
if (cpu_has_divec) {
|
|
if (cpu_has_mipsmt) {
|
|
unsigned int vpflags = dvpe();
|
|
set_c0_cause(CAUSEF_IV);
|
|
evpe(vpflags);
|
|
} else
|
|
set_c0_cause(CAUSEF_IV);
|
|
}
|
|
}
|
|
|
|
void per_cpu_trap_init(bool is_boot_cpu)
|
|
{
|
|
unsigned int cpu = smp_processor_id();
|
|
|
|
configure_status();
|
|
configure_hwrena();
|
|
|
|
configure_exception_vector();
|
|
|
|
/*
|
|
* Before R2 both interrupt numbers were fixed to 7, so on R2 only:
|
|
*
|
|
* o read IntCtl.IPTI to determine the timer interrupt
|
|
* o read IntCtl.IPPCI to determine the performance counter interrupt
|
|
* o read IntCtl.IPFDC to determine the fast debug channel interrupt
|
|
*/
|
|
if (cpu_has_mips_r2_r6) {
|
|
cp0_compare_irq_shift = CAUSEB_TI - CAUSEB_IP;
|
|
cp0_compare_irq = (read_c0_intctl() >> INTCTLB_IPTI) & 7;
|
|
cp0_perfcount_irq = (read_c0_intctl() >> INTCTLB_IPPCI) & 7;
|
|
cp0_fdc_irq = (read_c0_intctl() >> INTCTLB_IPFDC) & 7;
|
|
if (!cp0_fdc_irq)
|
|
cp0_fdc_irq = -1;
|
|
|
|
} else {
|
|
cp0_compare_irq = CP0_LEGACY_COMPARE_IRQ;
|
|
cp0_compare_irq_shift = CP0_LEGACY_PERFCNT_IRQ;
|
|
cp0_perfcount_irq = -1;
|
|
cp0_fdc_irq = -1;
|
|
}
|
|
|
|
if (cpu_has_mmid)
|
|
cpu_data[cpu].asid_cache = 0;
|
|
else if (!cpu_data[cpu].asid_cache)
|
|
cpu_data[cpu].asid_cache = asid_first_version(cpu);
|
|
|
|
mmgrab(&init_mm);
|
|
current->active_mm = &init_mm;
|
|
BUG_ON(current->mm);
|
|
enter_lazy_tlb(&init_mm, current);
|
|
|
|
/* Boot CPU's cache setup in setup_arch(). */
|
|
if (!is_boot_cpu)
|
|
cpu_cache_init();
|
|
tlb_init();
|
|
TLBMISS_HANDLER_SETUP();
|
|
}
|
|
|
|
/* Install CPU exception handler */
|
|
void set_handler(unsigned long offset, void *addr, unsigned long size)
|
|
{
|
|
#ifdef CONFIG_CPU_MICROMIPS
|
|
memcpy((void *)(ebase + offset), ((unsigned char *)addr - 1), size);
|
|
#else
|
|
memcpy((void *)(ebase + offset), addr, size);
|
|
#endif
|
|
local_flush_icache_range(ebase + offset, ebase + offset + size);
|
|
}
|
|
|
|
static const char panic_null_cerr[] =
|
|
"Trying to set NULL cache error exception handler\n";
|
|
|
|
/*
|
|
* Install uncached CPU exception handler.
|
|
* This is suitable only for the cache error exception which is the only
|
|
* exception handler that is being run uncached.
|
|
*/
|
|
void set_uncached_handler(unsigned long offset, void *addr,
|
|
unsigned long size)
|
|
{
|
|
unsigned long uncached_ebase = CKSEG1ADDR(ebase);
|
|
|
|
if (!addr)
|
|
panic(panic_null_cerr);
|
|
|
|
memcpy((void *)(uncached_ebase + offset), addr, size);
|
|
}
|
|
|
|
static int __initdata rdhwr_noopt;
|
|
static int __init set_rdhwr_noopt(char *str)
|
|
{
|
|
rdhwr_noopt = 1;
|
|
return 1;
|
|
}
|
|
|
|
__setup("rdhwr_noopt", set_rdhwr_noopt);
|
|
|
|
void __init trap_init(void)
|
|
{
|
|
extern char except_vec3_generic;
|
|
extern char except_vec4;
|
|
extern char except_vec3_r4000;
|
|
unsigned long i, vec_size;
|
|
phys_addr_t ebase_pa;
|
|
|
|
check_wait();
|
|
|
|
if (!cpu_has_mips_r2_r6) {
|
|
ebase = CAC_BASE;
|
|
vec_size = 0x400;
|
|
} else {
|
|
if (cpu_has_veic || cpu_has_vint)
|
|
vec_size = 0x200 + VECTORSPACING*64;
|
|
else
|
|
vec_size = PAGE_SIZE;
|
|
|
|
ebase_pa = memblock_phys_alloc(vec_size, 1 << fls(vec_size));
|
|
if (!ebase_pa)
|
|
panic("%s: Failed to allocate %lu bytes align=0x%x\n",
|
|
__func__, vec_size, 1 << fls(vec_size));
|
|
|
|
/*
|
|
* Try to ensure ebase resides in KSeg0 if possible.
|
|
*
|
|
* It shouldn't generally be in XKPhys on MIPS64 to avoid
|
|
* hitting a poorly defined exception base for Cache Errors.
|
|
* The allocation is likely to be in the low 512MB of physical,
|
|
* in which case we should be able to convert to KSeg0.
|
|
*
|
|
* EVA is special though as it allows segments to be rearranged
|
|
* and to become uncached during cache error handling.
|
|
*/
|
|
if (!IS_ENABLED(CONFIG_EVA) && !WARN_ON(ebase_pa >= 0x20000000))
|
|
ebase = CKSEG0ADDR(ebase_pa);
|
|
else
|
|
ebase = (unsigned long)phys_to_virt(ebase_pa);
|
|
}
|
|
|
|
if (cpu_has_mmips) {
|
|
unsigned int config3 = read_c0_config3();
|
|
|
|
if (IS_ENABLED(CONFIG_CPU_MICROMIPS))
|
|
write_c0_config3(config3 | MIPS_CONF3_ISA_OE);
|
|
else
|
|
write_c0_config3(config3 & ~MIPS_CONF3_ISA_OE);
|
|
}
|
|
|
|
if (board_ebase_setup)
|
|
board_ebase_setup();
|
|
per_cpu_trap_init(true);
|
|
memblock_set_bottom_up(false);
|
|
|
|
/*
|
|
* Copy the generic exception handlers to their final destination.
|
|
* This will be overridden later as suitable for a particular
|
|
* configuration.
|
|
*/
|
|
set_handler(0x180, &except_vec3_generic, 0x80);
|
|
|
|
/*
|
|
* Setup default vectors
|
|
*/
|
|
for (i = 0; i <= 31; i++)
|
|
set_except_vector(i, handle_reserved);
|
|
|
|
/*
|
|
* Copy the EJTAG debug exception vector handler code to it's final
|
|
* destination.
|
|
*/
|
|
if (cpu_has_ejtag && board_ejtag_handler_setup)
|
|
board_ejtag_handler_setup();
|
|
|
|
/*
|
|
* Only some CPUs have the watch exceptions.
|
|
*/
|
|
if (cpu_has_watch)
|
|
set_except_vector(EXCCODE_WATCH, handle_watch);
|
|
|
|
/*
|
|
* Initialise interrupt handlers
|
|
*/
|
|
if (cpu_has_veic || cpu_has_vint) {
|
|
int nvec = cpu_has_veic ? 64 : 8;
|
|
for (i = 0; i < nvec; i++)
|
|
set_vi_handler(i, NULL);
|
|
}
|
|
else if (cpu_has_divec)
|
|
set_handler(0x200, &except_vec4, 0x8);
|
|
|
|
/*
|
|
* Some CPUs can enable/disable for cache parity detection, but does
|
|
* it different ways.
|
|
*/
|
|
parity_protection_init();
|
|
|
|
/*
|
|
* The Data Bus Errors / Instruction Bus Errors are signaled
|
|
* by external hardware. Therefore these two exceptions
|
|
* may have board specific handlers.
|
|
*/
|
|
if (board_be_init)
|
|
board_be_init();
|
|
|
|
set_except_vector(EXCCODE_INT, using_rollback_handler() ?
|
|
rollback_handle_int : handle_int);
|
|
set_except_vector(EXCCODE_MOD, handle_tlbm);
|
|
set_except_vector(EXCCODE_TLBL, handle_tlbl);
|
|
set_except_vector(EXCCODE_TLBS, handle_tlbs);
|
|
|
|
set_except_vector(EXCCODE_ADEL, handle_adel);
|
|
set_except_vector(EXCCODE_ADES, handle_ades);
|
|
|
|
set_except_vector(EXCCODE_IBE, handle_ibe);
|
|
set_except_vector(EXCCODE_DBE, handle_dbe);
|
|
|
|
set_except_vector(EXCCODE_SYS, handle_sys);
|
|
set_except_vector(EXCCODE_BP, handle_bp);
|
|
|
|
if (rdhwr_noopt)
|
|
set_except_vector(EXCCODE_RI, handle_ri);
|
|
else {
|
|
if (cpu_has_vtag_icache)
|
|
set_except_vector(EXCCODE_RI, handle_ri_rdhwr_tlbp);
|
|
else if (current_cpu_type() == CPU_LOONGSON64)
|
|
set_except_vector(EXCCODE_RI, handle_ri_rdhwr_tlbp);
|
|
else
|
|
set_except_vector(EXCCODE_RI, handle_ri_rdhwr);
|
|
}
|
|
|
|
set_except_vector(EXCCODE_CPU, handle_cpu);
|
|
set_except_vector(EXCCODE_OV, handle_ov);
|
|
set_except_vector(EXCCODE_TR, handle_tr);
|
|
set_except_vector(EXCCODE_MSAFPE, handle_msa_fpe);
|
|
|
|
if (board_nmi_handler_setup)
|
|
board_nmi_handler_setup();
|
|
|
|
if (cpu_has_fpu && !cpu_has_nofpuex)
|
|
set_except_vector(EXCCODE_FPE, handle_fpe);
|
|
|
|
if (cpu_has_ftlbparex)
|
|
set_except_vector(MIPS_EXCCODE_TLBPAR, handle_ftlb);
|
|
|
|
if (cpu_has_gsexcex)
|
|
set_except_vector(LOONGSON_EXCCODE_GSEXC, handle_gsexc);
|
|
|
|
if (cpu_has_rixiex) {
|
|
set_except_vector(EXCCODE_TLBRI, tlb_do_page_fault_0);
|
|
set_except_vector(EXCCODE_TLBXI, tlb_do_page_fault_0);
|
|
}
|
|
|
|
set_except_vector(EXCCODE_MSADIS, handle_msa);
|
|
set_except_vector(EXCCODE_MDMX, handle_mdmx);
|
|
|
|
if (cpu_has_mcheck)
|
|
set_except_vector(EXCCODE_MCHECK, handle_mcheck);
|
|
|
|
if (cpu_has_mipsmt)
|
|
set_except_vector(EXCCODE_THREAD, handle_mt);
|
|
|
|
set_except_vector(EXCCODE_DSPDIS, handle_dsp);
|
|
|
|
if (board_cache_error_setup)
|
|
board_cache_error_setup();
|
|
|
|
if (cpu_has_vce)
|
|
/* Special exception: R4[04]00 uses also the divec space. */
|
|
set_handler(0x180, &except_vec3_r4000, 0x100);
|
|
else if (cpu_has_4kex)
|
|
set_handler(0x180, &except_vec3_generic, 0x80);
|
|
else
|
|
set_handler(0x080, &except_vec3_generic, 0x80);
|
|
|
|
local_flush_icache_range(ebase, ebase + vec_size);
|
|
|
|
sort_extable(__start___dbe_table, __stop___dbe_table);
|
|
|
|
cu2_notifier(default_cu2_call, 0x80000000); /* Run last */
|
|
}
|
|
|
|
static int trap_pm_notifier(struct notifier_block *self, unsigned long cmd,
|
|
void *v)
|
|
{
|
|
switch (cmd) {
|
|
case CPU_PM_ENTER_FAILED:
|
|
case CPU_PM_EXIT:
|
|
configure_status();
|
|
configure_hwrena();
|
|
configure_exception_vector();
|
|
|
|
/* Restore register with CPU number for TLB handlers */
|
|
TLBMISS_HANDLER_RESTORE();
|
|
|
|
break;
|
|
}
|
|
|
|
return NOTIFY_OK;
|
|
}
|
|
|
|
static struct notifier_block trap_pm_notifier_block = {
|
|
.notifier_call = trap_pm_notifier,
|
|
};
|
|
|
|
static int __init trap_pm_init(void)
|
|
{
|
|
return cpu_pm_register_notifier(&trap_pm_notifier_block);
|
|
}
|
|
arch_initcall(trap_pm_init);
|