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![Marco Elver](/assets/img/avatar_default.png)
Introduces the TRAP_PERF si_code, and associated siginfo_t field si_perf. These will be used by the perf event subsystem to send signals (if requested) to the task where an event occurred. Signed-off-by: Marco Elver <elver@google.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Acked-by: Geert Uytterhoeven <geert@linux-m68k.org> # m68k Acked-by: Arnd Bergmann <arnd@arndb.de> # asm-generic Link: https://lkml.kernel.org/r/20210408103605.1676875-6-elver@google.com
1145 lines
30 KiB
C
1145 lines
30 KiB
C
/*
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* linux/arch/m68k/kernel/signal.c
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*
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* Copyright (C) 1991, 1992 Linus Torvalds
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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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/*
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* Linux/m68k support by Hamish Macdonald
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*
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* 68060 fixes by Jesper Skov
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*
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* 1997-12-01 Modified for POSIX.1b signals by Andreas Schwab
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*
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* mathemu support by Roman Zippel
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* (Note: fpstate in the signal context is completely ignored for the emulator
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* and the internal floating point format is put on stack)
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*/
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/*
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* ++roman (07/09/96): implemented signal stacks (specially for tosemu on
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* Atari :-) Current limitation: Only one sigstack can be active at one time.
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* If a second signal with SA_ONSTACK set arrives while working on a sigstack,
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* SA_ONSTACK is ignored. This behaviour avoids lots of trouble with nested
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* signal handlers!
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*/
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#include <linux/sched.h>
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#include <linux/mm.h>
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#include <linux/kernel.h>
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#include <linux/signal.h>
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#include <linux/syscalls.h>
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#include <linux/errno.h>
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#include <linux/wait.h>
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#include <linux/ptrace.h>
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#include <linux/unistd.h>
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#include <linux/stddef.h>
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#include <linux/highuid.h>
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#include <linux/personality.h>
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#include <linux/tty.h>
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#include <linux/binfmts.h>
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#include <linux/extable.h>
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#include <linux/tracehook.h>
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#include <asm/setup.h>
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#include <linux/uaccess.h>
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#include <asm/traps.h>
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#include <asm/ucontext.h>
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#include <asm/cacheflush.h>
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#ifdef CONFIG_MMU
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/*
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* Handle the slight differences in classic 68k and ColdFire trap frames.
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*/
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#ifdef CONFIG_COLDFIRE
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#define FORMAT 4
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#define FMT4SIZE 0
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#else
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#define FORMAT 0
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#define FMT4SIZE sizeof_field(struct frame, un.fmt4)
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#endif
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static const int frame_size_change[16] = {
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[1] = -1, /* sizeof_field(struct frame, un.fmt1), */
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[2] = sizeof_field(struct frame, un.fmt2),
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[3] = sizeof_field(struct frame, un.fmt3),
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[4] = FMT4SIZE,
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[5] = -1, /* sizeof_field(struct frame, un.fmt5), */
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[6] = -1, /* sizeof_field(struct frame, un.fmt6), */
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[7] = sizeof_field(struct frame, un.fmt7),
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[8] = -1, /* sizeof_field(struct frame, un.fmt8), */
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[9] = sizeof_field(struct frame, un.fmt9),
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[10] = sizeof_field(struct frame, un.fmta),
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[11] = sizeof_field(struct frame, un.fmtb),
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[12] = -1, /* sizeof_field(struct frame, un.fmtc), */
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[13] = -1, /* sizeof_field(struct frame, un.fmtd), */
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[14] = -1, /* sizeof_field(struct frame, un.fmte), */
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[15] = -1, /* sizeof_field(struct frame, un.fmtf), */
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};
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static inline int frame_extra_sizes(int f)
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{
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return frame_size_change[f];
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}
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int fixup_exception(struct pt_regs *regs)
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{
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const struct exception_table_entry *fixup;
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struct pt_regs *tregs;
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/* Are we prepared to handle this kernel fault? */
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fixup = search_exception_tables(regs->pc);
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if (!fixup)
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return 0;
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/* Create a new four word stack frame, discarding the old one. */
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regs->stkadj = frame_extra_sizes(regs->format);
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tregs = (struct pt_regs *)((long)regs + regs->stkadj);
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tregs->vector = regs->vector;
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tregs->format = FORMAT;
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tregs->pc = fixup->fixup;
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tregs->sr = regs->sr;
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return 1;
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}
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static inline void push_cache (unsigned long vaddr)
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{
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/*
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* Using the old cache_push_v() was really a big waste.
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*
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* What we are trying to do is to flush 8 bytes to ram.
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* Flushing 2 cache lines of 16 bytes is much cheaper than
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* flushing 1 or 2 pages, as previously done in
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* cache_push_v().
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* Jes
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*/
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if (CPU_IS_040) {
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unsigned long temp;
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__asm__ __volatile__ (".chip 68040\n\t"
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"nop\n\t"
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"ptestr (%1)\n\t"
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"movec %%mmusr,%0\n\t"
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".chip 68k"
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: "=r" (temp)
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: "a" (vaddr));
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temp &= PAGE_MASK;
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temp |= vaddr & ~PAGE_MASK;
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__asm__ __volatile__ (".chip 68040\n\t"
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"nop\n\t"
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"cpushl %%bc,(%0)\n\t"
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".chip 68k"
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: : "a" (temp));
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}
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else if (CPU_IS_060) {
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unsigned long temp;
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__asm__ __volatile__ (".chip 68060\n\t"
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"plpar (%0)\n\t"
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".chip 68k"
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: "=a" (temp)
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: "0" (vaddr));
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__asm__ __volatile__ (".chip 68060\n\t"
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"cpushl %%bc,(%0)\n\t"
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".chip 68k"
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: : "a" (temp));
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} else if (!CPU_IS_COLDFIRE) {
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/*
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* 68030/68020 have no writeback cache;
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* still need to clear icache.
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* Note that vaddr is guaranteed to be long word aligned.
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*/
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unsigned long temp;
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asm volatile ("movec %%cacr,%0" : "=r" (temp));
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temp += 4;
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asm volatile ("movec %0,%%caar\n\t"
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"movec %1,%%cacr"
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: : "r" (vaddr), "r" (temp));
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asm volatile ("movec %0,%%caar\n\t"
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"movec %1,%%cacr"
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: : "r" (vaddr + 4), "r" (temp));
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} else {
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/* CPU_IS_COLDFIRE */
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#if defined(CONFIG_CACHE_COPYBACK)
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flush_cf_dcache(0, DCACHE_MAX_ADDR);
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#endif
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/* Invalidate instruction cache for the pushed bytes */
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clear_cf_icache(vaddr, vaddr + 8);
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}
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}
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static inline void adjustformat(struct pt_regs *regs)
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{
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}
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static inline void save_a5_state(struct sigcontext *sc, struct pt_regs *regs)
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{
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}
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#else /* CONFIG_MMU */
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void ret_from_user_signal(void);
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void ret_from_user_rt_signal(void);
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static inline int frame_extra_sizes(int f)
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{
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/* No frame size adjustments required on non-MMU CPUs */
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return 0;
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}
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static inline void adjustformat(struct pt_regs *regs)
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{
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/*
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* set format byte to make stack appear modulo 4, which it will
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* be when doing the rte
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*/
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regs->format = 0x4;
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}
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static inline void save_a5_state(struct sigcontext *sc, struct pt_regs *regs)
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{
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sc->sc_a5 = ((struct switch_stack *)regs - 1)->a5;
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}
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static inline void push_cache(unsigned long vaddr)
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{
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}
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#endif /* CONFIG_MMU */
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/*
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* Do a signal return; undo the signal stack.
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*
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* Keep the return code on the stack quadword aligned!
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* That makes the cache flush below easier.
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*/
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struct sigframe
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{
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char __user *pretcode;
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int sig;
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int code;
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struct sigcontext __user *psc;
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char retcode[8];
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unsigned long extramask[_NSIG_WORDS-1];
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struct sigcontext sc;
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};
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struct rt_sigframe
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{
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char __user *pretcode;
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int sig;
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struct siginfo __user *pinfo;
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void __user *puc;
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char retcode[8];
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struct siginfo info;
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struct ucontext uc;
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};
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#define FPCONTEXT_SIZE 216
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#define uc_fpstate uc_filler[0]
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#define uc_formatvec uc_filler[FPCONTEXT_SIZE/4]
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#define uc_extra uc_filler[FPCONTEXT_SIZE/4+1]
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#ifdef CONFIG_FPU
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static unsigned char fpu_version; /* version number of fpu, set by setup_frame */
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static inline int restore_fpu_state(struct sigcontext *sc)
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{
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int err = 1;
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if (FPU_IS_EMU) {
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/* restore registers */
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memcpy(current->thread.fpcntl, sc->sc_fpcntl, 12);
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memcpy(current->thread.fp, sc->sc_fpregs, 24);
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return 0;
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}
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if (CPU_IS_060 ? sc->sc_fpstate[2] : sc->sc_fpstate[0]) {
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/* Verify the frame format. */
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if (!(CPU_IS_060 || CPU_IS_COLDFIRE) &&
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(sc->sc_fpstate[0] != fpu_version))
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goto out;
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if (CPU_IS_020_OR_030) {
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if (m68k_fputype & FPU_68881 &&
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!(sc->sc_fpstate[1] == 0x18 || sc->sc_fpstate[1] == 0xb4))
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goto out;
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if (m68k_fputype & FPU_68882 &&
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!(sc->sc_fpstate[1] == 0x38 || sc->sc_fpstate[1] == 0xd4))
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goto out;
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} else if (CPU_IS_040) {
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if (!(sc->sc_fpstate[1] == 0x00 ||
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sc->sc_fpstate[1] == 0x28 ||
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sc->sc_fpstate[1] == 0x60))
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goto out;
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} else if (CPU_IS_060) {
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if (!(sc->sc_fpstate[3] == 0x00 ||
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sc->sc_fpstate[3] == 0x60 ||
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sc->sc_fpstate[3] == 0xe0))
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goto out;
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} else if (CPU_IS_COLDFIRE) {
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if (!(sc->sc_fpstate[0] == 0x00 ||
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sc->sc_fpstate[0] == 0x05 ||
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sc->sc_fpstate[0] == 0xe5))
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goto out;
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} else
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goto out;
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if (CPU_IS_COLDFIRE) {
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__asm__ volatile ("fmovemd %0,%%fp0-%%fp1\n\t"
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"fmovel %1,%%fpcr\n\t"
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"fmovel %2,%%fpsr\n\t"
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"fmovel %3,%%fpiar"
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: /* no outputs */
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: "m" (sc->sc_fpregs[0]),
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"m" (sc->sc_fpcntl[0]),
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"m" (sc->sc_fpcntl[1]),
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"m" (sc->sc_fpcntl[2]));
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} else {
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__asm__ volatile (".chip 68k/68881\n\t"
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"fmovemx %0,%%fp0-%%fp1\n\t"
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"fmoveml %1,%%fpcr/%%fpsr/%%fpiar\n\t"
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".chip 68k"
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: /* no outputs */
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: "m" (*sc->sc_fpregs),
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"m" (*sc->sc_fpcntl));
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}
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}
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|
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if (CPU_IS_COLDFIRE) {
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__asm__ volatile ("frestore %0" : : "m" (*sc->sc_fpstate));
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} else {
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__asm__ volatile (".chip 68k/68881\n\t"
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"frestore %0\n\t"
|
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".chip 68k"
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: : "m" (*sc->sc_fpstate));
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}
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err = 0;
|
|
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out:
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return err;
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}
|
|
|
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static inline int rt_restore_fpu_state(struct ucontext __user *uc)
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{
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unsigned char fpstate[FPCONTEXT_SIZE];
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int context_size = CPU_IS_060 ? 8 : (CPU_IS_COLDFIRE ? 12 : 0);
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fpregset_t fpregs;
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int err = 1;
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|
|
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if (FPU_IS_EMU) {
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/* restore fpu control register */
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if (__copy_from_user(current->thread.fpcntl,
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uc->uc_mcontext.fpregs.f_fpcntl, 12))
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goto out;
|
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/* restore all other fpu register */
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if (__copy_from_user(current->thread.fp,
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uc->uc_mcontext.fpregs.f_fpregs, 96))
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goto out;
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return 0;
|
|
}
|
|
|
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if (__get_user(*(long *)fpstate, (long __user *)&uc->uc_fpstate))
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|
goto out;
|
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if (CPU_IS_060 ? fpstate[2] : fpstate[0]) {
|
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if (!(CPU_IS_060 || CPU_IS_COLDFIRE))
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context_size = fpstate[1];
|
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/* Verify the frame format. */
|
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if (!(CPU_IS_060 || CPU_IS_COLDFIRE) &&
|
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(fpstate[0] != fpu_version))
|
|
goto out;
|
|
if (CPU_IS_020_OR_030) {
|
|
if (m68k_fputype & FPU_68881 &&
|
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!(context_size == 0x18 || context_size == 0xb4))
|
|
goto out;
|
|
if (m68k_fputype & FPU_68882 &&
|
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!(context_size == 0x38 || context_size == 0xd4))
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goto out;
|
|
} else if (CPU_IS_040) {
|
|
if (!(context_size == 0x00 ||
|
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context_size == 0x28 ||
|
|
context_size == 0x60))
|
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goto out;
|
|
} else if (CPU_IS_060) {
|
|
if (!(fpstate[3] == 0x00 ||
|
|
fpstate[3] == 0x60 ||
|
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fpstate[3] == 0xe0))
|
|
goto out;
|
|
} else if (CPU_IS_COLDFIRE) {
|
|
if (!(fpstate[3] == 0x00 ||
|
|
fpstate[3] == 0x05 ||
|
|
fpstate[3] == 0xe5))
|
|
goto out;
|
|
} else
|
|
goto out;
|
|
if (__copy_from_user(&fpregs, &uc->uc_mcontext.fpregs,
|
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sizeof(fpregs)))
|
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goto out;
|
|
|
|
if (CPU_IS_COLDFIRE) {
|
|
__asm__ volatile ("fmovemd %0,%%fp0-%%fp7\n\t"
|
|
"fmovel %1,%%fpcr\n\t"
|
|
"fmovel %2,%%fpsr\n\t"
|
|
"fmovel %3,%%fpiar"
|
|
: /* no outputs */
|
|
: "m" (fpregs.f_fpregs[0]),
|
|
"m" (fpregs.f_fpcntl[0]),
|
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"m" (fpregs.f_fpcntl[1]),
|
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"m" (fpregs.f_fpcntl[2]));
|
|
} else {
|
|
__asm__ volatile (".chip 68k/68881\n\t"
|
|
"fmovemx %0,%%fp0-%%fp7\n\t"
|
|
"fmoveml %1,%%fpcr/%%fpsr/%%fpiar\n\t"
|
|
".chip 68k"
|
|
: /* no outputs */
|
|
: "m" (*fpregs.f_fpregs),
|
|
"m" (*fpregs.f_fpcntl));
|
|
}
|
|
}
|
|
if (context_size &&
|
|
__copy_from_user(fpstate + 4, (long __user *)&uc->uc_fpstate + 1,
|
|
context_size))
|
|
goto out;
|
|
|
|
if (CPU_IS_COLDFIRE) {
|
|
__asm__ volatile ("frestore %0" : : "m" (*fpstate));
|
|
} else {
|
|
__asm__ volatile (".chip 68k/68881\n\t"
|
|
"frestore %0\n\t"
|
|
".chip 68k"
|
|
: : "m" (*fpstate));
|
|
}
|
|
err = 0;
|
|
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* Set up a signal frame.
|
|
*/
|
|
static inline void save_fpu_state(struct sigcontext *sc, struct pt_regs *regs)
|
|
{
|
|
if (FPU_IS_EMU) {
|
|
/* save registers */
|
|
memcpy(sc->sc_fpcntl, current->thread.fpcntl, 12);
|
|
memcpy(sc->sc_fpregs, current->thread.fp, 24);
|
|
return;
|
|
}
|
|
|
|
if (CPU_IS_COLDFIRE) {
|
|
__asm__ volatile ("fsave %0"
|
|
: : "m" (*sc->sc_fpstate) : "memory");
|
|
} else {
|
|
__asm__ volatile (".chip 68k/68881\n\t"
|
|
"fsave %0\n\t"
|
|
".chip 68k"
|
|
: : "m" (*sc->sc_fpstate) : "memory");
|
|
}
|
|
|
|
if (CPU_IS_060 ? sc->sc_fpstate[2] : sc->sc_fpstate[0]) {
|
|
fpu_version = sc->sc_fpstate[0];
|
|
if (CPU_IS_020_OR_030 &&
|
|
regs->vector >= (VEC_FPBRUC * 4) &&
|
|
regs->vector <= (VEC_FPNAN * 4)) {
|
|
/* Clear pending exception in 68882 idle frame */
|
|
if (*(unsigned short *) sc->sc_fpstate == 0x1f38)
|
|
sc->sc_fpstate[0x38] |= 1 << 3;
|
|
}
|
|
|
|
if (CPU_IS_COLDFIRE) {
|
|
__asm__ volatile ("fmovemd %%fp0-%%fp1,%0\n\t"
|
|
"fmovel %%fpcr,%1\n\t"
|
|
"fmovel %%fpsr,%2\n\t"
|
|
"fmovel %%fpiar,%3"
|
|
: "=m" (sc->sc_fpregs[0]),
|
|
"=m" (sc->sc_fpcntl[0]),
|
|
"=m" (sc->sc_fpcntl[1]),
|
|
"=m" (sc->sc_fpcntl[2])
|
|
: /* no inputs */
|
|
: "memory");
|
|
} else {
|
|
__asm__ volatile (".chip 68k/68881\n\t"
|
|
"fmovemx %%fp0-%%fp1,%0\n\t"
|
|
"fmoveml %%fpcr/%%fpsr/%%fpiar,%1\n\t"
|
|
".chip 68k"
|
|
: "=m" (*sc->sc_fpregs),
|
|
"=m" (*sc->sc_fpcntl)
|
|
: /* no inputs */
|
|
: "memory");
|
|
}
|
|
}
|
|
}
|
|
|
|
static inline int rt_save_fpu_state(struct ucontext __user *uc, struct pt_regs *regs)
|
|
{
|
|
unsigned char fpstate[FPCONTEXT_SIZE];
|
|
int context_size = CPU_IS_060 ? 8 : (CPU_IS_COLDFIRE ? 12 : 0);
|
|
int err = 0;
|
|
|
|
if (FPU_IS_EMU) {
|
|
/* save fpu control register */
|
|
err |= copy_to_user(uc->uc_mcontext.fpregs.f_fpcntl,
|
|
current->thread.fpcntl, 12);
|
|
/* save all other fpu register */
|
|
err |= copy_to_user(uc->uc_mcontext.fpregs.f_fpregs,
|
|
current->thread.fp, 96);
|
|
return err;
|
|
}
|
|
|
|
if (CPU_IS_COLDFIRE) {
|
|
__asm__ volatile ("fsave %0" : : "m" (*fpstate) : "memory");
|
|
} else {
|
|
__asm__ volatile (".chip 68k/68881\n\t"
|
|
"fsave %0\n\t"
|
|
".chip 68k"
|
|
: : "m" (*fpstate) : "memory");
|
|
}
|
|
|
|
err |= __put_user(*(long *)fpstate, (long __user *)&uc->uc_fpstate);
|
|
if (CPU_IS_060 ? fpstate[2] : fpstate[0]) {
|
|
fpregset_t fpregs;
|
|
if (!(CPU_IS_060 || CPU_IS_COLDFIRE))
|
|
context_size = fpstate[1];
|
|
fpu_version = fpstate[0];
|
|
if (CPU_IS_020_OR_030 &&
|
|
regs->vector >= (VEC_FPBRUC * 4) &&
|
|
regs->vector <= (VEC_FPNAN * 4)) {
|
|
/* Clear pending exception in 68882 idle frame */
|
|
if (*(unsigned short *) fpstate == 0x1f38)
|
|
fpstate[0x38] |= 1 << 3;
|
|
}
|
|
if (CPU_IS_COLDFIRE) {
|
|
__asm__ volatile ("fmovemd %%fp0-%%fp7,%0\n\t"
|
|
"fmovel %%fpcr,%1\n\t"
|
|
"fmovel %%fpsr,%2\n\t"
|
|
"fmovel %%fpiar,%3"
|
|
: "=m" (fpregs.f_fpregs[0]),
|
|
"=m" (fpregs.f_fpcntl[0]),
|
|
"=m" (fpregs.f_fpcntl[1]),
|
|
"=m" (fpregs.f_fpcntl[2])
|
|
: /* no inputs */
|
|
: "memory");
|
|
} else {
|
|
__asm__ volatile (".chip 68k/68881\n\t"
|
|
"fmovemx %%fp0-%%fp7,%0\n\t"
|
|
"fmoveml %%fpcr/%%fpsr/%%fpiar,%1\n\t"
|
|
".chip 68k"
|
|
: "=m" (*fpregs.f_fpregs),
|
|
"=m" (*fpregs.f_fpcntl)
|
|
: /* no inputs */
|
|
: "memory");
|
|
}
|
|
err |= copy_to_user(&uc->uc_mcontext.fpregs, &fpregs,
|
|
sizeof(fpregs));
|
|
}
|
|
if (context_size)
|
|
err |= copy_to_user((long __user *)&uc->uc_fpstate + 1, fpstate + 4,
|
|
context_size);
|
|
return err;
|
|
}
|
|
|
|
#else /* CONFIG_FPU */
|
|
|
|
/*
|
|
* For the case with no FPU configured these all do nothing.
|
|
*/
|
|
static inline int restore_fpu_state(struct sigcontext *sc)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static inline int rt_restore_fpu_state(struct ucontext __user *uc)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static inline void save_fpu_state(struct sigcontext *sc, struct pt_regs *regs)
|
|
{
|
|
}
|
|
|
|
static inline int rt_save_fpu_state(struct ucontext __user *uc, struct pt_regs *regs)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
#endif /* CONFIG_FPU */
|
|
|
|
static inline void siginfo_build_tests(void)
|
|
{
|
|
/*
|
|
* This needs to be tested on m68k as it has a lesser
|
|
* alignment requirement than x86 and that can cause surprises.
|
|
*/
|
|
|
|
/* This is part of the ABI and can never change in size: */
|
|
BUILD_BUG_ON(sizeof(siginfo_t) != 128);
|
|
|
|
/* Ensure the known fields never change in location */
|
|
BUILD_BUG_ON(offsetof(siginfo_t, si_signo) != 0);
|
|
BUILD_BUG_ON(offsetof(siginfo_t, si_errno) != 4);
|
|
BUILD_BUG_ON(offsetof(siginfo_t, si_code) != 8);
|
|
|
|
/* _kill */
|
|
BUILD_BUG_ON(offsetof(siginfo_t, si_pid) != 0x0c);
|
|
BUILD_BUG_ON(offsetof(siginfo_t, si_uid) != 0x10);
|
|
|
|
/* _timer */
|
|
BUILD_BUG_ON(offsetof(siginfo_t, si_tid) != 0x0c);
|
|
BUILD_BUG_ON(offsetof(siginfo_t, si_overrun) != 0x10);
|
|
BUILD_BUG_ON(offsetof(siginfo_t, si_value) != 0x14);
|
|
|
|
/* _rt */
|
|
BUILD_BUG_ON(offsetof(siginfo_t, si_pid) != 0x0c);
|
|
BUILD_BUG_ON(offsetof(siginfo_t, si_uid) != 0x10);
|
|
BUILD_BUG_ON(offsetof(siginfo_t, si_value) != 0x14);
|
|
|
|
/* _sigchld */
|
|
BUILD_BUG_ON(offsetof(siginfo_t, si_pid) != 0x0c);
|
|
BUILD_BUG_ON(offsetof(siginfo_t, si_uid) != 0x10);
|
|
BUILD_BUG_ON(offsetof(siginfo_t, si_status) != 0x14);
|
|
BUILD_BUG_ON(offsetof(siginfo_t, si_utime) != 0x18);
|
|
BUILD_BUG_ON(offsetof(siginfo_t, si_stime) != 0x1c);
|
|
|
|
/* _sigfault */
|
|
BUILD_BUG_ON(offsetof(siginfo_t, si_addr) != 0x0c);
|
|
|
|
/* _sigfault._mcerr */
|
|
BUILD_BUG_ON(offsetof(siginfo_t, si_addr_lsb) != 0x10);
|
|
|
|
/* _sigfault._addr_bnd */
|
|
BUILD_BUG_ON(offsetof(siginfo_t, si_lower) != 0x12);
|
|
BUILD_BUG_ON(offsetof(siginfo_t, si_upper) != 0x16);
|
|
|
|
/* _sigfault._addr_pkey */
|
|
BUILD_BUG_ON(offsetof(siginfo_t, si_pkey) != 0x12);
|
|
|
|
/* _sigfault._perf */
|
|
BUILD_BUG_ON(offsetof(siginfo_t, si_perf) != 0x10);
|
|
|
|
/* _sigpoll */
|
|
BUILD_BUG_ON(offsetof(siginfo_t, si_band) != 0x0c);
|
|
BUILD_BUG_ON(offsetof(siginfo_t, si_fd) != 0x10);
|
|
|
|
/* _sigsys */
|
|
BUILD_BUG_ON(offsetof(siginfo_t, si_call_addr) != 0x0c);
|
|
BUILD_BUG_ON(offsetof(siginfo_t, si_syscall) != 0x10);
|
|
BUILD_BUG_ON(offsetof(siginfo_t, si_arch) != 0x14);
|
|
|
|
/* any new si_fields should be added here */
|
|
}
|
|
|
|
static int mangle_kernel_stack(struct pt_regs *regs, int formatvec,
|
|
void __user *fp)
|
|
{
|
|
int fsize = frame_extra_sizes(formatvec >> 12);
|
|
if (fsize < 0) {
|
|
/*
|
|
* user process trying to return with weird frame format
|
|
*/
|
|
pr_debug("user process returning with weird frame format\n");
|
|
return 1;
|
|
}
|
|
if (!fsize) {
|
|
regs->format = formatvec >> 12;
|
|
regs->vector = formatvec & 0xfff;
|
|
} else {
|
|
struct switch_stack *sw = (struct switch_stack *)regs - 1;
|
|
/* yes, twice as much as max(sizeof(frame.un.fmt<x>)) */
|
|
unsigned long buf[sizeof_field(struct frame, un) / 2];
|
|
|
|
/* that'll make sure that expansion won't crap over data */
|
|
if (copy_from_user(buf + fsize / 4, fp, fsize))
|
|
return 1;
|
|
|
|
/* point of no return */
|
|
regs->format = formatvec >> 12;
|
|
regs->vector = formatvec & 0xfff;
|
|
#define frame_offset (sizeof(struct pt_regs)+sizeof(struct switch_stack))
|
|
__asm__ __volatile__ (
|
|
#ifdef CONFIG_COLDFIRE
|
|
" movel %0,%/sp\n\t"
|
|
" bra ret_from_signal\n"
|
|
#else
|
|
" movel %0,%/a0\n\t"
|
|
" subl %1,%/a0\n\t" /* make room on stack */
|
|
" movel %/a0,%/sp\n\t" /* set stack pointer */
|
|
/* move switch_stack and pt_regs */
|
|
"1: movel %0@+,%/a0@+\n\t"
|
|
" dbra %2,1b\n\t"
|
|
" lea %/sp@(%c3),%/a0\n\t" /* add offset of fmt */
|
|
" lsrl #2,%1\n\t"
|
|
" subql #1,%1\n\t"
|
|
/* copy to the gap we'd made */
|
|
"2: movel %4@+,%/a0@+\n\t"
|
|
" dbra %1,2b\n\t"
|
|
" bral ret_from_signal\n"
|
|
#endif
|
|
: /* no outputs, it doesn't ever return */
|
|
: "a" (sw), "d" (fsize), "d" (frame_offset/4-1),
|
|
"n" (frame_offset), "a" (buf + fsize/4)
|
|
: "a0");
|
|
#undef frame_offset
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static inline int
|
|
restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *usc, void __user *fp)
|
|
{
|
|
int formatvec;
|
|
struct sigcontext context;
|
|
int err = 0;
|
|
|
|
siginfo_build_tests();
|
|
|
|
/* Always make any pending restarted system calls return -EINTR */
|
|
current->restart_block.fn = do_no_restart_syscall;
|
|
|
|
/* get previous context */
|
|
if (copy_from_user(&context, usc, sizeof(context)))
|
|
goto badframe;
|
|
|
|
/* restore passed registers */
|
|
regs->d0 = context.sc_d0;
|
|
regs->d1 = context.sc_d1;
|
|
regs->a0 = context.sc_a0;
|
|
regs->a1 = context.sc_a1;
|
|
regs->sr = (regs->sr & 0xff00) | (context.sc_sr & 0xff);
|
|
regs->pc = context.sc_pc;
|
|
regs->orig_d0 = -1; /* disable syscall checks */
|
|
wrusp(context.sc_usp);
|
|
formatvec = context.sc_formatvec;
|
|
|
|
err = restore_fpu_state(&context);
|
|
|
|
if (err || mangle_kernel_stack(regs, formatvec, fp))
|
|
goto badframe;
|
|
|
|
return 0;
|
|
|
|
badframe:
|
|
return 1;
|
|
}
|
|
|
|
static inline int
|
|
rt_restore_ucontext(struct pt_regs *regs, struct switch_stack *sw,
|
|
struct ucontext __user *uc)
|
|
{
|
|
int temp;
|
|
greg_t __user *gregs = uc->uc_mcontext.gregs;
|
|
unsigned long usp;
|
|
int err;
|
|
|
|
/* Always make any pending restarted system calls return -EINTR */
|
|
current->restart_block.fn = do_no_restart_syscall;
|
|
|
|
err = __get_user(temp, &uc->uc_mcontext.version);
|
|
if (temp != MCONTEXT_VERSION)
|
|
goto badframe;
|
|
/* restore passed registers */
|
|
err |= __get_user(regs->d0, &gregs[0]);
|
|
err |= __get_user(regs->d1, &gregs[1]);
|
|
err |= __get_user(regs->d2, &gregs[2]);
|
|
err |= __get_user(regs->d3, &gregs[3]);
|
|
err |= __get_user(regs->d4, &gregs[4]);
|
|
err |= __get_user(regs->d5, &gregs[5]);
|
|
err |= __get_user(sw->d6, &gregs[6]);
|
|
err |= __get_user(sw->d7, &gregs[7]);
|
|
err |= __get_user(regs->a0, &gregs[8]);
|
|
err |= __get_user(regs->a1, &gregs[9]);
|
|
err |= __get_user(regs->a2, &gregs[10]);
|
|
err |= __get_user(sw->a3, &gregs[11]);
|
|
err |= __get_user(sw->a4, &gregs[12]);
|
|
err |= __get_user(sw->a5, &gregs[13]);
|
|
err |= __get_user(sw->a6, &gregs[14]);
|
|
err |= __get_user(usp, &gregs[15]);
|
|
wrusp(usp);
|
|
err |= __get_user(regs->pc, &gregs[16]);
|
|
err |= __get_user(temp, &gregs[17]);
|
|
regs->sr = (regs->sr & 0xff00) | (temp & 0xff);
|
|
regs->orig_d0 = -1; /* disable syscall checks */
|
|
err |= __get_user(temp, &uc->uc_formatvec);
|
|
|
|
err |= rt_restore_fpu_state(uc);
|
|
err |= restore_altstack(&uc->uc_stack);
|
|
|
|
if (err)
|
|
goto badframe;
|
|
|
|
if (mangle_kernel_stack(regs, temp, &uc->uc_extra))
|
|
goto badframe;
|
|
|
|
return 0;
|
|
|
|
badframe:
|
|
return 1;
|
|
}
|
|
|
|
asmlinkage int do_sigreturn(struct pt_regs *regs, struct switch_stack *sw)
|
|
{
|
|
unsigned long usp = rdusp();
|
|
struct sigframe __user *frame = (struct sigframe __user *)(usp - 4);
|
|
sigset_t set;
|
|
|
|
if (!access_ok(frame, sizeof(*frame)))
|
|
goto badframe;
|
|
if (__get_user(set.sig[0], &frame->sc.sc_mask) ||
|
|
(_NSIG_WORDS > 1 &&
|
|
__copy_from_user(&set.sig[1], &frame->extramask,
|
|
sizeof(frame->extramask))))
|
|
goto badframe;
|
|
|
|
set_current_blocked(&set);
|
|
|
|
if (restore_sigcontext(regs, &frame->sc, frame + 1))
|
|
goto badframe;
|
|
return regs->d0;
|
|
|
|
badframe:
|
|
force_sig(SIGSEGV);
|
|
return 0;
|
|
}
|
|
|
|
asmlinkage int do_rt_sigreturn(struct pt_regs *regs, struct switch_stack *sw)
|
|
{
|
|
unsigned long usp = rdusp();
|
|
struct rt_sigframe __user *frame = (struct rt_sigframe __user *)(usp - 4);
|
|
sigset_t set;
|
|
|
|
if (!access_ok(frame, sizeof(*frame)))
|
|
goto badframe;
|
|
if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
|
|
goto badframe;
|
|
|
|
set_current_blocked(&set);
|
|
|
|
if (rt_restore_ucontext(regs, sw, &frame->uc))
|
|
goto badframe;
|
|
return regs->d0;
|
|
|
|
badframe:
|
|
force_sig(SIGSEGV);
|
|
return 0;
|
|
}
|
|
|
|
static void setup_sigcontext(struct sigcontext *sc, struct pt_regs *regs,
|
|
unsigned long mask)
|
|
{
|
|
sc->sc_mask = mask;
|
|
sc->sc_usp = rdusp();
|
|
sc->sc_d0 = regs->d0;
|
|
sc->sc_d1 = regs->d1;
|
|
sc->sc_a0 = regs->a0;
|
|
sc->sc_a1 = regs->a1;
|
|
sc->sc_sr = regs->sr;
|
|
sc->sc_pc = regs->pc;
|
|
sc->sc_formatvec = regs->format << 12 | regs->vector;
|
|
save_a5_state(sc, regs);
|
|
save_fpu_state(sc, regs);
|
|
}
|
|
|
|
static inline int rt_setup_ucontext(struct ucontext __user *uc, struct pt_regs *regs)
|
|
{
|
|
struct switch_stack *sw = (struct switch_stack *)regs - 1;
|
|
greg_t __user *gregs = uc->uc_mcontext.gregs;
|
|
int err = 0;
|
|
|
|
err |= __put_user(MCONTEXT_VERSION, &uc->uc_mcontext.version);
|
|
err |= __put_user(regs->d0, &gregs[0]);
|
|
err |= __put_user(regs->d1, &gregs[1]);
|
|
err |= __put_user(regs->d2, &gregs[2]);
|
|
err |= __put_user(regs->d3, &gregs[3]);
|
|
err |= __put_user(regs->d4, &gregs[4]);
|
|
err |= __put_user(regs->d5, &gregs[5]);
|
|
err |= __put_user(sw->d6, &gregs[6]);
|
|
err |= __put_user(sw->d7, &gregs[7]);
|
|
err |= __put_user(regs->a0, &gregs[8]);
|
|
err |= __put_user(regs->a1, &gregs[9]);
|
|
err |= __put_user(regs->a2, &gregs[10]);
|
|
err |= __put_user(sw->a3, &gregs[11]);
|
|
err |= __put_user(sw->a4, &gregs[12]);
|
|
err |= __put_user(sw->a5, &gregs[13]);
|
|
err |= __put_user(sw->a6, &gregs[14]);
|
|
err |= __put_user(rdusp(), &gregs[15]);
|
|
err |= __put_user(regs->pc, &gregs[16]);
|
|
err |= __put_user(regs->sr, &gregs[17]);
|
|
err |= __put_user((regs->format << 12) | regs->vector, &uc->uc_formatvec);
|
|
err |= rt_save_fpu_state(uc, regs);
|
|
return err;
|
|
}
|
|
|
|
static inline void __user *
|
|
get_sigframe(struct ksignal *ksig, size_t frame_size)
|
|
{
|
|
unsigned long usp = sigsp(rdusp(), ksig);
|
|
|
|
return (void __user *)((usp - frame_size) & -8UL);
|
|
}
|
|
|
|
static int setup_frame(struct ksignal *ksig, sigset_t *set,
|
|
struct pt_regs *regs)
|
|
{
|
|
struct sigframe __user *frame;
|
|
int fsize = frame_extra_sizes(regs->format);
|
|
struct sigcontext context;
|
|
int err = 0, sig = ksig->sig;
|
|
|
|
if (fsize < 0) {
|
|
pr_debug("setup_frame: Unknown frame format %#x\n",
|
|
regs->format);
|
|
return -EFAULT;
|
|
}
|
|
|
|
frame = get_sigframe(ksig, sizeof(*frame) + fsize);
|
|
|
|
if (fsize)
|
|
err |= copy_to_user (frame + 1, regs + 1, fsize);
|
|
|
|
err |= __put_user(sig, &frame->sig);
|
|
|
|
err |= __put_user(regs->vector, &frame->code);
|
|
err |= __put_user(&frame->sc, &frame->psc);
|
|
|
|
if (_NSIG_WORDS > 1)
|
|
err |= copy_to_user(frame->extramask, &set->sig[1],
|
|
sizeof(frame->extramask));
|
|
|
|
setup_sigcontext(&context, regs, set->sig[0]);
|
|
err |= copy_to_user (&frame->sc, &context, sizeof(context));
|
|
|
|
/* Set up to return from userspace. */
|
|
#ifdef CONFIG_MMU
|
|
err |= __put_user(frame->retcode, &frame->pretcode);
|
|
/* moveq #,d0; trap #0 */
|
|
err |= __put_user(0x70004e40 + (__NR_sigreturn << 16),
|
|
(long __user *)(frame->retcode));
|
|
#else
|
|
err |= __put_user((long) ret_from_user_signal,
|
|
(long __user *) &frame->pretcode);
|
|
#endif
|
|
|
|
if (err)
|
|
return -EFAULT;
|
|
|
|
push_cache ((unsigned long) &frame->retcode);
|
|
|
|
/*
|
|
* Set up registers for signal handler. All the state we are about
|
|
* to destroy is successfully copied to sigframe.
|
|
*/
|
|
wrusp ((unsigned long) frame);
|
|
regs->pc = (unsigned long) ksig->ka.sa.sa_handler;
|
|
adjustformat(regs);
|
|
|
|
/*
|
|
* This is subtle; if we build more than one sigframe, all but the
|
|
* first one will see frame format 0 and have fsize == 0, so we won't
|
|
* screw stkadj.
|
|
*/
|
|
if (fsize)
|
|
regs->stkadj = fsize;
|
|
|
|
/* Prepare to skip over the extra stuff in the exception frame. */
|
|
if (regs->stkadj) {
|
|
struct pt_regs *tregs =
|
|
(struct pt_regs *)((ulong)regs + regs->stkadj);
|
|
pr_debug("Performing stackadjust=%04lx\n", regs->stkadj);
|
|
/* This must be copied with decreasing addresses to
|
|
handle overlaps. */
|
|
tregs->vector = 0;
|
|
tregs->format = 0;
|
|
tregs->pc = regs->pc;
|
|
tregs->sr = regs->sr;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int setup_rt_frame(struct ksignal *ksig, sigset_t *set,
|
|
struct pt_regs *regs)
|
|
{
|
|
struct rt_sigframe __user *frame;
|
|
int fsize = frame_extra_sizes(regs->format);
|
|
int err = 0, sig = ksig->sig;
|
|
|
|
if (fsize < 0) {
|
|
pr_debug("setup_frame: Unknown frame format %#x\n",
|
|
regs->format);
|
|
return -EFAULT;
|
|
}
|
|
|
|
frame = get_sigframe(ksig, sizeof(*frame));
|
|
|
|
if (fsize)
|
|
err |= copy_to_user (&frame->uc.uc_extra, regs + 1, fsize);
|
|
|
|
err |= __put_user(sig, &frame->sig);
|
|
err |= __put_user(&frame->info, &frame->pinfo);
|
|
err |= __put_user(&frame->uc, &frame->puc);
|
|
err |= copy_siginfo_to_user(&frame->info, &ksig->info);
|
|
|
|
/* Create the ucontext. */
|
|
err |= __put_user(0, &frame->uc.uc_flags);
|
|
err |= __put_user(NULL, &frame->uc.uc_link);
|
|
err |= __save_altstack(&frame->uc.uc_stack, rdusp());
|
|
err |= rt_setup_ucontext(&frame->uc, regs);
|
|
err |= copy_to_user (&frame->uc.uc_sigmask, set, sizeof(*set));
|
|
|
|
/* Set up to return from userspace. */
|
|
#ifdef CONFIG_MMU
|
|
err |= __put_user(frame->retcode, &frame->pretcode);
|
|
#ifdef __mcoldfire__
|
|
/* movel #__NR_rt_sigreturn,d0; trap #0 */
|
|
err |= __put_user(0x203c0000, (long __user *)(frame->retcode + 0));
|
|
err |= __put_user(0x00004e40 + (__NR_rt_sigreturn << 16),
|
|
(long __user *)(frame->retcode + 4));
|
|
#else
|
|
/* moveq #,d0; notb d0; trap #0 */
|
|
err |= __put_user(0x70004600 + ((__NR_rt_sigreturn ^ 0xff) << 16),
|
|
(long __user *)(frame->retcode + 0));
|
|
err |= __put_user(0x4e40, (short __user *)(frame->retcode + 4));
|
|
#endif
|
|
#else
|
|
err |= __put_user((long) ret_from_user_rt_signal,
|
|
(long __user *) &frame->pretcode);
|
|
#endif /* CONFIG_MMU */
|
|
|
|
if (err)
|
|
return -EFAULT;
|
|
|
|
push_cache ((unsigned long) &frame->retcode);
|
|
|
|
/*
|
|
* Set up registers for signal handler. All the state we are about
|
|
* to destroy is successfully copied to sigframe.
|
|
*/
|
|
wrusp ((unsigned long) frame);
|
|
regs->pc = (unsigned long) ksig->ka.sa.sa_handler;
|
|
adjustformat(regs);
|
|
|
|
/*
|
|
* This is subtle; if we build more than one sigframe, all but the
|
|
* first one will see frame format 0 and have fsize == 0, so we won't
|
|
* screw stkadj.
|
|
*/
|
|
if (fsize)
|
|
regs->stkadj = fsize;
|
|
|
|
/* Prepare to skip over the extra stuff in the exception frame. */
|
|
if (regs->stkadj) {
|
|
struct pt_regs *tregs =
|
|
(struct pt_regs *)((ulong)regs + regs->stkadj);
|
|
pr_debug("Performing stackadjust=%04lx\n", regs->stkadj);
|
|
/* This must be copied with decreasing addresses to
|
|
handle overlaps. */
|
|
tregs->vector = 0;
|
|
tregs->format = 0;
|
|
tregs->pc = regs->pc;
|
|
tregs->sr = regs->sr;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static inline void
|
|
handle_restart(struct pt_regs *regs, struct k_sigaction *ka, int has_handler)
|
|
{
|
|
switch (regs->d0) {
|
|
case -ERESTARTNOHAND:
|
|
if (!has_handler)
|
|
goto do_restart;
|
|
regs->d0 = -EINTR;
|
|
break;
|
|
|
|
case -ERESTART_RESTARTBLOCK:
|
|
if (!has_handler) {
|
|
regs->d0 = __NR_restart_syscall;
|
|
regs->pc -= 2;
|
|
break;
|
|
}
|
|
regs->d0 = -EINTR;
|
|
break;
|
|
|
|
case -ERESTARTSYS:
|
|
if (has_handler && !(ka->sa.sa_flags & SA_RESTART)) {
|
|
regs->d0 = -EINTR;
|
|
break;
|
|
}
|
|
fallthrough;
|
|
case -ERESTARTNOINTR:
|
|
do_restart:
|
|
regs->d0 = regs->orig_d0;
|
|
regs->pc -= 2;
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* OK, we're invoking a handler
|
|
*/
|
|
static void
|
|
handle_signal(struct ksignal *ksig, struct pt_regs *regs)
|
|
{
|
|
sigset_t *oldset = sigmask_to_save();
|
|
int err;
|
|
/* are we from a system call? */
|
|
if (regs->orig_d0 >= 0)
|
|
/* If so, check system call restarting.. */
|
|
handle_restart(regs, &ksig->ka, 1);
|
|
|
|
/* set up the stack frame */
|
|
if (ksig->ka.sa.sa_flags & SA_SIGINFO)
|
|
err = setup_rt_frame(ksig, oldset, regs);
|
|
else
|
|
err = setup_frame(ksig, oldset, regs);
|
|
|
|
signal_setup_done(err, ksig, 0);
|
|
|
|
if (test_thread_flag(TIF_DELAYED_TRACE)) {
|
|
regs->sr &= ~0x8000;
|
|
send_sig(SIGTRAP, current, 1);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Note that 'init' is a special process: it doesn't get signals it doesn't
|
|
* want to handle. Thus you cannot kill init even with a SIGKILL even by
|
|
* mistake.
|
|
*/
|
|
static void do_signal(struct pt_regs *regs)
|
|
{
|
|
struct ksignal ksig;
|
|
|
|
current->thread.esp0 = (unsigned long) regs;
|
|
|
|
if (get_signal(&ksig)) {
|
|
/* Whee! Actually deliver the signal. */
|
|
handle_signal(&ksig, regs);
|
|
return;
|
|
}
|
|
|
|
/* Did we come from a system call? */
|
|
if (regs->orig_d0 >= 0)
|
|
/* Restart the system call - no handlers present */
|
|
handle_restart(regs, NULL, 0);
|
|
|
|
/* If there's no signal to deliver, we just restore the saved mask. */
|
|
restore_saved_sigmask();
|
|
}
|
|
|
|
void do_notify_resume(struct pt_regs *regs)
|
|
{
|
|
if (test_thread_flag(TIF_NOTIFY_SIGNAL) ||
|
|
test_thread_flag(TIF_SIGPENDING))
|
|
do_signal(regs);
|
|
|
|
if (test_thread_flag(TIF_NOTIFY_RESUME))
|
|
tracehook_notify_resume(regs);
|
|
}
|