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1113 lines
29 KiB
1113 lines
29 KiB
/* |
|
* linux/arch/m68k/kernel/signal.c |
|
* |
|
* 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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* 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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|
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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/resume_user_mode.h> |
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|
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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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|
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#ifdef CONFIG_MMU |
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|
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/* |
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* Handle the slight differences in classic 68k and ColdFire trap frames. |
|
*/ |
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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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|
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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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* Using the old cache_push_v() was really a big waste. |
|
* |
|
* 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; |
|
|
|
__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)); |
|
|
|
temp &= PAGE_MASK; |
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temp |= vaddr & ~PAGE_MASK; |
|
|
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__asm__ __volatile__ (".chip 68040\n\t" |
|
"nop\n\t" |
|
"cpushl %%bc,(%0)\n\t" |
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".chip 68k" |
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: : "a" (temp)); |
|
} |
|
else if (CPU_IS_060) { |
|
unsigned long temp; |
|
__asm__ __volatile__ (".chip 68060\n\t" |
|
"plpar (%0)\n\t" |
|
".chip 68k" |
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: "=a" (temp) |
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: "0" (vaddr)); |
|
__asm__ __volatile__ (".chip 68060\n\t" |
|
"cpushl %%bc,(%0)\n\t" |
|
".chip 68k" |
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: : "a" (temp)); |
|
} else if (!CPU_IS_COLDFIRE) { |
|
/* |
|
* 68030/68020 have no writeback cache; |
|
* still need to clear icache. |
|
* Note that vaddr is guaranteed to be long word aligned. |
|
*/ |
|
unsigned long temp; |
|
asm volatile ("movec %%cacr,%0" : "=r" (temp)); |
|
temp += 4; |
|
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 { |
|
/* CPU_IS_COLDFIRE */ |
|
#if defined(CONFIG_CACHE_COPYBACK) |
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flush_cf_dcache(0, DCACHE_MAX_ADDR); |
|
#endif |
|
/* 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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|
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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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/* No frame size adjustments required on non-MMU CPUs */ |
|
return 0; |
|
} |
|
|
|
static inline void adjustformat(struct pt_regs *regs) |
|
{ |
|
/* |
|
* set format byte to make stack appear modulo 4, which it will |
|
* be when doing the rte |
|
*/ |
|
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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sc->sc_a5 = ((struct switch_stack *)regs - 1)->a5; |
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} |
|
|
|
static inline void push_cache(unsigned long vaddr) |
|
{ |
|
} |
|
|
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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; |
|
}; |
|
|
|
struct rt_sigframe |
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{ |
|
char __user *pretcode; |
|
int sig; |
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struct siginfo __user *pinfo; |
|
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] |
|
|
|
#ifdef CONFIG_FPU |
|
|
|
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) |
|
{ |
|
int err = 1; |
|
|
|
if (FPU_IS_EMU) { |
|
/* restore registers */ |
|
memcpy(current->thread.fpcntl, sc->sc_fpcntl, 12); |
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memcpy(current->thread.fp, sc->sc_fpregs, 24); |
|
return 0; |
|
} |
|
|
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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) && |
|
(sc->sc_fpstate[0] != fpu_version)) |
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goto out; |
|
if (CPU_IS_020_OR_030) { |
|
if (m68k_fputype & FPU_68881 && |
|
!(sc->sc_fpstate[1] == 0x18 || sc->sc_fpstate[1] == 0xb4)) |
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goto out; |
|
if (m68k_fputype & FPU_68882 && |
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!(sc->sc_fpstate[1] == 0x38 || sc->sc_fpstate[1] == 0xd4)) |
|
goto out; |
|
} else if (CPU_IS_040) { |
|
if (!(sc->sc_fpstate[1] == 0x00 || |
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sc->sc_fpstate[1] == 0x28 || |
|
sc->sc_fpstate[1] == 0x60)) |
|
goto out; |
|
} else if (CPU_IS_060) { |
|
if (!(sc->sc_fpstate[3] == 0x00 || |
|
sc->sc_fpstate[3] == 0x60 || |
|
sc->sc_fpstate[3] == 0xe0)) |
|
goto out; |
|
} else if (CPU_IS_COLDFIRE) { |
|
if (!(sc->sc_fpstate[0] == 0x00 || |
|
sc->sc_fpstate[0] == 0x05 || |
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sc->sc_fpstate[0] == 0xe5)) |
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goto out; |
|
} else |
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goto out; |
|
|
|
if (CPU_IS_COLDFIRE) { |
|
__asm__ volatile ("fmovemd %0,%%fp0-%%fp1\n\t" |
|
"fmovel %1,%%fpcr\n\t" |
|
"fmovel %2,%%fpsr\n\t" |
|
"fmovel %3,%%fpiar" |
|
: /* no outputs */ |
|
: "m" (sc->sc_fpregs[0]), |
|
"m" (sc->sc_fpcntl[0]), |
|
"m" (sc->sc_fpcntl[1]), |
|
"m" (sc->sc_fpcntl[2])); |
|
} else { |
|
__asm__ volatile (".chip 68k/68881\n\t" |
|
"fmovemx %0,%%fp0-%%fp1\n\t" |
|
"fmoveml %1,%%fpcr/%%fpsr/%%fpiar\n\t" |
|
".chip 68k" |
|
: /* no outputs */ |
|
: "m" (*sc->sc_fpregs), |
|
"m" (*sc->sc_fpcntl)); |
|
} |
|
} |
|
|
|
if (CPU_IS_COLDFIRE) { |
|
__asm__ volatile ("frestore %0" : : "m" (*sc->sc_fpstate)); |
|
} else { |
|
__asm__ volatile (".chip 68k/68881\n\t" |
|
"frestore %0\n\t" |
|
".chip 68k" |
|
: : "m" (*sc->sc_fpstate)); |
|
} |
|
err = 0; |
|
|
|
out: |
|
return err; |
|
} |
|
|
|
static inline int rt_restore_fpu_state(struct ucontext __user *uc) |
|
{ |
|
unsigned char fpstate[FPCONTEXT_SIZE]; |
|
int context_size = CPU_IS_060 ? 8 : (CPU_IS_COLDFIRE ? 12 : 0); |
|
fpregset_t fpregs; |
|
int err = 1; |
|
|
|
if (FPU_IS_EMU) { |
|
/* restore fpu control register */ |
|
if (__copy_from_user(current->thread.fpcntl, |
|
uc->uc_mcontext.fpregs.f_fpcntl, 12)) |
|
goto out; |
|
/* restore all other fpu register */ |
|
if (__copy_from_user(current->thread.fp, |
|
uc->uc_mcontext.fpregs.f_fpregs, 96)) |
|
goto out; |
|
return 0; |
|
} |
|
|
|
if (__get_user(*(long *)fpstate, (long __user *)&uc->uc_fpstate)) |
|
goto out; |
|
if (CPU_IS_060 ? fpstate[2] : fpstate[0]) { |
|
if (!(CPU_IS_060 || CPU_IS_COLDFIRE)) |
|
context_size = fpstate[1]; |
|
/* Verify the frame format. */ |
|
if (!(CPU_IS_060 || CPU_IS_COLDFIRE) && |
|
(fpstate[0] != fpu_version)) |
|
goto out; |
|
if (CPU_IS_020_OR_030) { |
|
if (m68k_fputype & FPU_68881 && |
|
!(context_size == 0x18 || context_size == 0xb4)) |
|
goto out; |
|
if (m68k_fputype & FPU_68882 && |
|
!(context_size == 0x38 || context_size == 0xd4)) |
|
goto out; |
|
} else if (CPU_IS_040) { |
|
if (!(context_size == 0x00 || |
|
context_size == 0x28 || |
|
context_size == 0x60)) |
|
goto out; |
|
} else if (CPU_IS_060) { |
|
if (!(fpstate[3] == 0x00 || |
|
fpstate[3] == 0x60 || |
|
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, |
|
sizeof(fpregs))) |
|
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]), |
|
"m" (fpregs.f_fpcntl[1]), |
|
"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->stkadj && |
|
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->stkadj && |
|
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_data) != 0x10); |
|
BUILD_BUG_ON(offsetof(siginfo_t, si_perf_type) != 0x14); |
|
|
|
/* _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 extra = frame_extra_sizes(formatvec >> 12); |
|
char buf[sizeof_field(struct frame, un)]; |
|
|
|
if (extra < 0) { |
|
/* |
|
* user process trying to return with weird frame format |
|
*/ |
|
pr_debug("user process returning with weird frame format\n"); |
|
return -1; |
|
} |
|
if (extra && copy_from_user(buf, fp, extra)) |
|
return -1; |
|
regs->format = formatvec >> 12; |
|
regs->vector = formatvec & 0xfff; |
|
if (extra) { |
|
void *p = (struct switch_stack *)regs - 1; |
|
struct frame *new = (void *)regs - extra; |
|
int size = sizeof(struct pt_regs)+sizeof(struct switch_stack); |
|
|
|
memmove(p - extra, p, size); |
|
memcpy(p - extra + size, buf, extra); |
|
current->thread.esp0 = (unsigned long)&new->ptregs; |
|
#ifdef CONFIG_M68040 |
|
/* on 68040 complete pending writebacks if any */ |
|
if (new->ptregs.format == 7) // bus error frame |
|
berr_040cleanup(new); |
|
#endif |
|
} |
|
return extra; |
|
} |
|
|
|
static inline int |
|
restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *usc, void __user *fp) |
|
{ |
|
int formatvec; |
|
struct sigcontext context; |
|
|
|
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))) |
|
return -1; |
|
|
|
/* 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; |
|
|
|
if (restore_fpu_state(&context)) |
|
return -1; |
|
|
|
return mangle_kernel_stack(regs, formatvec, fp); |
|
} |
|
|
|
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) |
|
return -1; |
|
/* 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) |
|
return -1; |
|
|
|
return mangle_kernel_stack(regs, temp, &uc->uc_extra); |
|
} |
|
|
|
asmlinkage void *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; |
|
int size; |
|
|
|
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); |
|
|
|
size = restore_sigcontext(regs, &frame->sc, frame + 1); |
|
if (size < 0) |
|
goto badframe; |
|
return (void *)sw - size; |
|
|
|
badframe: |
|
force_sig(SIGSEGV); |
|
return sw; |
|
} |
|
|
|
asmlinkage void *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; |
|
int size; |
|
|
|
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); |
|
|
|
size = rt_restore_ucontext(regs, sw, &frame->uc); |
|
if (size < 0) |
|
goto badframe; |
|
return (void *)sw - size; |
|
|
|
badframe: |
|
force_sig(SIGSEGV); |
|
return sw; |
|
} |
|
|
|
static inline struct pt_regs *rte_regs(struct pt_regs *regs) |
|
{ |
|
return (void *)regs + regs->stkadj; |
|
} |
|
|
|
static void setup_sigcontext(struct sigcontext *sc, struct pt_regs *regs, |
|
unsigned long mask) |
|
{ |
|
struct pt_regs *tregs = rte_regs(regs); |
|
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 = tregs->sr; |
|
sc->sc_pc = tregs->pc; |
|
sc->sc_formatvec = tregs->format << 12 | tregs->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; |
|
struct pt_regs *tregs = rte_regs(regs); |
|
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(tregs->pc, &gregs[16]); |
|
err |= __put_user(tregs->sr, &gregs[17]); |
|
err |= __put_user((tregs->format << 12) | tregs->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; |
|
struct pt_regs *tregs = rte_regs(regs); |
|
int fsize = frame_extra_sizes(tregs->format); |
|
struct sigcontext context; |
|
int err = 0, sig = ksig->sig; |
|
|
|
if (fsize < 0) { |
|
pr_debug("setup_frame: Unknown frame format %#x\n", |
|
tregs->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(tregs->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); |
|
|
|
/* |
|
* 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; |
|
tregs = rte_regs(regs); |
|
pr_debug("Performing stackadjust=%04lx\n", regs->stkadj); |
|
tregs->vector = 0; |
|
tregs->format = 0; |
|
tregs->sr = regs->sr; |
|
} |
|
|
|
/* |
|
* Set up registers for signal handler. All the state we are about |
|
* to destroy is successfully copied to sigframe. |
|
*/ |
|
wrusp ((unsigned long) frame); |
|
tregs->pc = (unsigned long) ksig->ka.sa.sa_handler; |
|
adjustformat(regs); |
|
|
|
return 0; |
|
} |
|
|
|
static int setup_rt_frame(struct ksignal *ksig, sigset_t *set, |
|
struct pt_regs *regs) |
|
{ |
|
struct rt_sigframe __user *frame; |
|
struct pt_regs *tregs = rte_regs(regs); |
|
int fsize = frame_extra_sizes(tregs->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); |
|
|
|
/* |
|
* 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; |
|
tregs = rte_regs(regs); |
|
pr_debug("Performing stackadjust=%04lx\n", regs->stkadj); |
|
tregs->vector = 0; |
|
tregs->format = 0; |
|
tregs->sr = regs->sr; |
|
} |
|
|
|
/* |
|
* Set up registers for signal handler. All the state we are about |
|
* to destroy is successfully copied to sigframe. |
|
*/ |
|
wrusp ((unsigned long) frame); |
|
tregs->pc = (unsigned long) ksig->ka.sa.sa_handler; |
|
adjustformat(regs); |
|
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)) |
|
resume_user_mode_work(regs); |
|
}
|
|
|