microblaze_v8: ptrace support
Reviewed-by: Ingo Molnar <mingo@elte.hu> Acked-by: John Linn <john.linn@xilinx.com> Acked-by: Stephen Neuendorffer <stephen.neuendorffer@xilinx.com> Acked-by: John Williams <john.williams@petalogix.com> Signed-off-by: Michal Simek <monstr@monstr.eu>
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Michal Simek
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216f03481d
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2b43845426
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/*
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* Copyright (C) 2006 Atmark Techno, Inc.
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*
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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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#ifndef _ASM_MICROBLAZE_PTRACE_H
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#define _ASM_MICROBLAZE_PTRACE_H
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#ifndef __ASSEMBLY__
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#include <linux/types.h>
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typedef unsigned long microblaze_reg_t;
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struct pt_regs {
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microblaze_reg_t r0;
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microblaze_reg_t r1;
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microblaze_reg_t r2;
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microblaze_reg_t r3;
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microblaze_reg_t r4;
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microblaze_reg_t r5;
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microblaze_reg_t r6;
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microblaze_reg_t r7;
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microblaze_reg_t r8;
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microblaze_reg_t r9;
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microblaze_reg_t r10;
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microblaze_reg_t r11;
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microblaze_reg_t r12;
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microblaze_reg_t r13;
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microblaze_reg_t r14;
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microblaze_reg_t r15;
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microblaze_reg_t r16;
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microblaze_reg_t r17;
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microblaze_reg_t r18;
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microblaze_reg_t r19;
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microblaze_reg_t r20;
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microblaze_reg_t r21;
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microblaze_reg_t r22;
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microblaze_reg_t r23;
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microblaze_reg_t r24;
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microblaze_reg_t r25;
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microblaze_reg_t r26;
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microblaze_reg_t r27;
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microblaze_reg_t r28;
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microblaze_reg_t r29;
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microblaze_reg_t r30;
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microblaze_reg_t r31;
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microblaze_reg_t pc;
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microblaze_reg_t msr;
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microblaze_reg_t ear;
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microblaze_reg_t esr;
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microblaze_reg_t fsr;
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int kernel_mode;
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};
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#define kernel_mode(regs) ((regs)->kernel_mode)
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#define user_mode(regs) (!kernel_mode(regs))
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#define instruction_pointer(regs) ((regs)->pc)
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#define profile_pc(regs) instruction_pointer(regs)
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void show_regs(struct pt_regs *);
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#endif /* __ASSEMBLY__ */
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#endif /* _ASM_MICROBLAZE_PTRACE_H */
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/*
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* `ptrace' system call
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*
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* Copyright (C) 2008-2009 Michal Simek <monstr@monstr.eu>
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* Copyright (C) 2007-2009 PetaLogix
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* Copyright (C) 2004-2007 John Williams <john.williams@petalogix.com>
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*
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* derived from arch/v850/kernel/ptrace.c
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*
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* Copyright (C) 2002,03 NEC Electronics Corporation
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* Copyright (C) 2002,03 Miles Bader <miles@gnu.org>
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*
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* Derived from arch/mips/kernel/ptrace.c:
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*
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* Copyright (C) 1992 Ross Biro
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* Copyright (C) Linus Torvalds
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* Copyright (C) 1994, 95, 96, 97, 98, 2000 Ralf Baechle
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* Copyright (C) 1996 David S. Miller
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* Kevin D. Kissell, kevink@mips.com and Carsten Langgaard, carstenl@mips.com
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* Copyright (C) 1999 MIPS Technologies, Inc.
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*
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* This file is subject to the terms and conditions of the GNU General
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* Public License. See the file COPYING in the main directory of this
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* archive for more details.
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*/
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/sched.h>
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#include <linux/smp_lock.h>
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#include <linux/ptrace.h>
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#include <linux/signal.h>
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#include <linux/errno.h>
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#include <linux/ptrace.h>
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#include <asm/processor.h>
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#include <linux/uaccess.h>
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#include <asm/asm-offsets.h>
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/* Returns the address where the register at REG_OFFS in P is stashed away. */
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static microblaze_reg_t *reg_save_addr(unsigned reg_offs,
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struct task_struct *t)
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{
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struct pt_regs *regs;
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/*
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* Three basic cases:
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*
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* (1) A register normally saved before calling the scheduler, is
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* available in the kernel entry pt_regs structure at the top
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* of the kernel stack. The kernel trap/irq exit path takes
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* care to save/restore almost all registers for ptrace'd
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* processes.
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*
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* (2) A call-clobbered register, where the process P entered the
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* kernel via [syscall] trap, is not stored anywhere; that's
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* OK, because such registers are not expected to be preserved
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* when the trap returns anyway (so we don't actually bother to
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* test for this case).
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*
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* (3) A few registers not used at all by the kernel, and so
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* normally never saved except by context-switches, are in the
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* context switch state.
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*/
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/* Register saved during kernel entry (or not available). */
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regs = task_pt_regs(t);
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return (microblaze_reg_t *)((char *)regs + reg_offs);
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}
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long arch_ptrace(struct task_struct *child, long request, long addr, long data)
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{
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int rval;
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unsigned long val = 0;
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unsigned long copied;
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switch (request) {
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case PTRACE_PEEKTEXT: /* read word at location addr. */
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case PTRACE_PEEKDATA:
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pr_debug("PEEKTEXT/PEEKDATA at %08lX\n", addr);
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copied = access_process_vm(child, addr, &val, sizeof(val), 0);
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rval = -EIO;
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if (copied != sizeof(val))
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break;
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rval = put_user(val, (unsigned long *)data);
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break;
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case PTRACE_POKETEXT: /* write the word at location addr. */
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case PTRACE_POKEDATA:
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pr_debug("POKETEXT/POKEDATA to %08lX\n", addr);
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rval = 0;
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if (access_process_vm(child, addr, &data, sizeof(data), 1)
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== sizeof(data))
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break;
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rval = -EIO;
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break;
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/* Read/write the word at location ADDR in the registers. */
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case PTRACE_PEEKUSR:
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case PTRACE_POKEUSR:
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pr_debug("PEEKUSR/POKEUSR : 0x%08lx\n", addr);
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rval = 0;
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if (addr >= PT_SIZE && request == PTRACE_PEEKUSR) {
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/*
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* Special requests that don't actually correspond
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* to offsets in struct pt_regs.
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*/
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if (addr == PT_TEXT_ADDR) {
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val = child->mm->start_code;
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} else if (addr == PT_DATA_ADDR) {
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val = child->mm->start_data;
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} else if (addr == PT_TEXT_LEN) {
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val = child->mm->end_code
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- child->mm->start_code;
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} else {
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rval = -EIO;
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}
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} else if (addr >= 0 && addr < PT_SIZE && (addr & 0x3) == 0) {
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microblaze_reg_t *reg_addr = reg_save_addr(addr, child);
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if (request == PTRACE_PEEKUSR)
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val = *reg_addr;
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else
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*reg_addr = data;
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} else
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rval = -EIO;
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if (rval == 0 && request == PTRACE_PEEKUSR)
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rval = put_user(val, (unsigned long *)data);
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break;
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/* Continue and stop at next (return from) syscall */
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case PTRACE_SYSCALL:
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pr_debug("PTRACE_SYSCALL\n");
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case PTRACE_SINGLESTEP:
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pr_debug("PTRACE_SINGLESTEP\n");
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/* Restart after a signal. */
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case PTRACE_CONT:
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pr_debug("PTRACE_CONT\n");
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rval = -EIO;
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if (!valid_signal(data))
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break;
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if (request == PTRACE_SYSCALL)
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set_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
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else
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clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
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child->exit_code = data;
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pr_debug("wakeup_process\n");
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wake_up_process(child);
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rval = 0;
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break;
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/*
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* make the child exit. Best I can do is send it a sigkill.
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* perhaps it should be put in the status that it wants to
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* exit.
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*/
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case PTRACE_KILL:
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pr_debug("PTRACE_KILL\n");
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rval = 0;
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if (child->exit_state == EXIT_ZOMBIE) /* already dead */
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break;
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child->exit_code = SIGKILL;
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wake_up_process(child);
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break;
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case PTRACE_DETACH: /* detach a process that was attached. */
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pr_debug("PTRACE_DETACH\n");
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rval = ptrace_detach(child, data);
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break;
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default:
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/* rval = ptrace_request(child, request, addr, data); noMMU */
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rval = -EIO;
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}
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return rval;
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}
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void ptrace_disable(struct task_struct *child)
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{
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/* nothing to do */
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}
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