+++ /dev/null
-/*
- * Copyright (C) 1991, 1992 Linus Torvalds
- * Copyright (C) 2000, 2001, 2002 Andi Kleen SuSE Labs
- *
- * 1997-11-28 Modified for POSIX.1b signals by Richard Henderson
- * 2000-06-20 Pentium III FXSR, SSE support by Gareth Hughes
- * 2000-2002 x86-64 support by Andi Kleen
- */
-
-#include <linux/sched.h>
-#include <linux/mm.h>
-#include <linux/smp.h>
-#include <linux/kernel.h>
-#include <linux/signal.h>
-#include <linux/errno.h>
-#include <linux/wait.h>
-#include <linux/ptrace.h>
-#include <linux/tracehook.h>
-#include <linux/unistd.h>
-#include <linux/stddef.h>
-#include <linux/personality.h>
-#include <linux/uaccess.h>
-
-#include <asm/processor.h>
-#include <asm/ucontext.h>
-#include <asm/i387.h>
-#include <asm/vdso.h>
-
-#ifdef CONFIG_X86_64
-#include <asm/proto.h>
-#include <asm/ia32_unistd.h>
-#include <asm/mce.h>
-#endif /* CONFIG_X86_64 */
-
-#include <asm/syscall.h>
-#include <asm/syscalls.h>
-
-#include "sigframe.h"
-
-#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
-
-#define __FIX_EFLAGS (X86_EFLAGS_AC | X86_EFLAGS_OF | \
- X86_EFLAGS_DF | X86_EFLAGS_TF | X86_EFLAGS_SF | \
- X86_EFLAGS_ZF | X86_EFLAGS_AF | X86_EFLAGS_PF | \
- X86_EFLAGS_CF)
-
-#ifdef CONFIG_X86_32
-# define FIX_EFLAGS (__FIX_EFLAGS | X86_EFLAGS_RF)
-#else
-# define FIX_EFLAGS __FIX_EFLAGS
-#endif
-
-#define COPY(x) { \
- err |= __get_user(regs->x, &sc->x); \
-}
-
-#define COPY_SEG(seg) { \
- unsigned short tmp; \
- err |= __get_user(tmp, &sc->seg); \
- regs->seg = tmp; \
-}
-
-#define COPY_SEG_CPL3(seg) { \
- unsigned short tmp; \
- err |= __get_user(tmp, &sc->seg); \
- regs->seg = tmp | 3; \
-}
-
-#define GET_SEG(seg) { \
- unsigned short tmp; \
- err |= __get_user(tmp, &sc->seg); \
- loadsegment(seg, tmp); \
-}
-
-static int
-restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc,
- unsigned long *pax)
-{
- void __user *buf;
- unsigned int tmpflags;
- unsigned int err = 0;
-
- /* Always make any pending restarted system calls return -EINTR */
- current_thread_info()->restart_block.fn = do_no_restart_syscall;
-
-#ifdef CONFIG_X86_32
- GET_SEG(gs);
- COPY_SEG(fs);
- COPY_SEG(es);
- COPY_SEG(ds);
-#endif /* CONFIG_X86_32 */
-
- COPY(di); COPY(si); COPY(bp); COPY(sp); COPY(bx);
- COPY(dx); COPY(cx); COPY(ip);
-
-#ifdef CONFIG_X86_64
- COPY(r8);
- COPY(r9);
- COPY(r10);
- COPY(r11);
- COPY(r12);
- COPY(r13);
- COPY(r14);
- COPY(r15);
-#endif /* CONFIG_X86_64 */
-
-#ifdef CONFIG_X86_32
- COPY_SEG_CPL3(cs);
- COPY_SEG_CPL3(ss);
-#else /* !CONFIG_X86_32 */
- /* Kernel saves and restores only the CS segment register on signals,
- * which is the bare minimum needed to allow mixed 32/64-bit code.
- * App's signal handler can save/restore other segments if needed. */
- COPY_SEG_CPL3(cs);
-#endif /* CONFIG_X86_32 */
-
- err |= __get_user(tmpflags, &sc->flags);
- regs->flags = (regs->flags & ~FIX_EFLAGS) | (tmpflags & FIX_EFLAGS);
- regs->orig_ax = -1; /* disable syscall checks */
-
- err |= __get_user(buf, &sc->fpstate);
- err |= restore_i387_xstate(buf);
-
- err |= __get_user(*pax, &sc->ax);
- return err;
-}
-
-static int
-setup_sigcontext(struct sigcontext __user *sc, void __user *fpstate,
- struct pt_regs *regs, unsigned long mask)
-{
- int err = 0;
-
-#ifdef CONFIG_X86_32
- {
- unsigned int tmp;
-
- savesegment(gs, tmp);
- err |= __put_user(tmp, (unsigned int __user *)&sc->gs);
- }
- err |= __put_user(regs->fs, (unsigned int __user *)&sc->fs);
- err |= __put_user(regs->es, (unsigned int __user *)&sc->es);
- err |= __put_user(regs->ds, (unsigned int __user *)&sc->ds);
-#endif /* CONFIG_X86_32 */
-
- err |= __put_user(regs->di, &sc->di);
- err |= __put_user(regs->si, &sc->si);
- err |= __put_user(regs->bp, &sc->bp);
- err |= __put_user(regs->sp, &sc->sp);
- err |= __put_user(regs->bx, &sc->bx);
- err |= __put_user(regs->dx, &sc->dx);
- err |= __put_user(regs->cx, &sc->cx);
- err |= __put_user(regs->ax, &sc->ax);
-#ifdef CONFIG_X86_64
- err |= __put_user(regs->r8, &sc->r8);
- err |= __put_user(regs->r9, &sc->r9);
- err |= __put_user(regs->r10, &sc->r10);
- err |= __put_user(regs->r11, &sc->r11);
- err |= __put_user(regs->r12, &sc->r12);
- err |= __put_user(regs->r13, &sc->r13);
- err |= __put_user(regs->r14, &sc->r14);
- err |= __put_user(regs->r15, &sc->r15);
-#endif /* CONFIG_X86_64 */
-
- err |= __put_user(current->thread.trap_no, &sc->trapno);
- err |= __put_user(current->thread.error_code, &sc->err);
- err |= __put_user(regs->ip, &sc->ip);
-#ifdef CONFIG_X86_32
- err |= __put_user(regs->cs, (unsigned int __user *)&sc->cs);
- err |= __put_user(regs->flags, &sc->flags);
- err |= __put_user(regs->sp, &sc->sp_at_signal);
- err |= __put_user(regs->ss, (unsigned int __user *)&sc->ss);
-#else /* !CONFIG_X86_32 */
- err |= __put_user(regs->flags, &sc->flags);
- err |= __put_user(regs->cs, &sc->cs);
- err |= __put_user(0, &sc->gs);
- err |= __put_user(0, &sc->fs);
-#endif /* CONFIG_X86_32 */
-
- err |= __put_user(fpstate, &sc->fpstate);
-
- /* non-iBCS2 extensions.. */
- err |= __put_user(mask, &sc->oldmask);
- err |= __put_user(current->thread.cr2, &sc->cr2);
-
- return err;
-}
-
-/*
- * Set up a signal frame.
- */
-#ifdef CONFIG_X86_32
-static const struct {
- u16 poplmovl;
- u32 val;
- u16 int80;
-} __attribute__((packed)) retcode = {
- 0xb858, /* popl %eax; movl $..., %eax */
- __NR_sigreturn,
- 0x80cd, /* int $0x80 */
-};
-
-static const struct {
- u8 movl;
- u32 val;
- u16 int80;
- u8 pad;
-} __attribute__((packed)) rt_retcode = {
- 0xb8, /* movl $..., %eax */
- __NR_rt_sigreturn,
- 0x80cd, /* int $0x80 */
- 0
-};
-
-/*
- * Determine which stack to use..
- */
-static inline void __user *
-get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, size_t frame_size,
- void **fpstate)
-{
- unsigned long sp;
-
- /* Default to using normal stack */
- sp = regs->sp;
-
- /*
- * If we are on the alternate signal stack and would overflow it, don't.
- * Return an always-bogus address instead so we will die with SIGSEGV.
- */
- if (on_sig_stack(sp) && !likely(on_sig_stack(sp - frame_size)))
- return (void __user *) -1L;
-
- /* This is the X/Open sanctioned signal stack switching. */
- if (ka->sa.sa_flags & SA_ONSTACK) {
- if (sas_ss_flags(sp) == 0)
- sp = current->sas_ss_sp + current->sas_ss_size;
- } else {
- /* This is the legacy signal stack switching. */
- if ((regs->ss & 0xffff) != __USER_DS &&
- !(ka->sa.sa_flags & SA_RESTORER) &&
- ka->sa.sa_restorer)
- sp = (unsigned long) ka->sa.sa_restorer;
- }
-
- if (used_math()) {
- sp = sp - sig_xstate_size;
- *fpstate = (struct _fpstate *) sp;
- if (save_i387_xstate(*fpstate) < 0)
- return (void __user *)-1L;
- }
-
- sp -= frame_size;
- /*
- * Align the stack pointer according to the i386 ABI,
- * i.e. so that on function entry ((sp + 4) & 15) == 0.
- */
- sp = ((sp + 4) & -16ul) - 4;
-
- return (void __user *) sp;
-}
-
-static int
-__setup_frame(int sig, struct k_sigaction *ka, sigset_t *set,
- struct pt_regs *regs)
-{
- struct sigframe __user *frame;
- void __user *restorer;
- int err = 0;
- void __user *fpstate = NULL;
-
- frame = get_sigframe(ka, regs, sizeof(*frame), &fpstate);
-
- if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
- return -EFAULT;
-
- if (__put_user(sig, &frame->sig))
- return -EFAULT;
-
- if (setup_sigcontext(&frame->sc, fpstate, regs, set->sig[0]))
- return -EFAULT;
-
- if (_NSIG_WORDS > 1) {
- if (__copy_to_user(&frame->extramask, &set->sig[1],
- sizeof(frame->extramask)))
- return -EFAULT;
- }
-
- if (current->mm->context.vdso)
- restorer = VDSO32_SYMBOL(current->mm->context.vdso, sigreturn);
- else
- restorer = &frame->retcode;
- if (ka->sa.sa_flags & SA_RESTORER)
- restorer = ka->sa.sa_restorer;
-
- /* Set up to return from userspace. */
- err |= __put_user(restorer, &frame->pretcode);
-
- /*
- * This is popl %eax ; movl $__NR_sigreturn, %eax ; int $0x80
- *
- * WE DO NOT USE IT ANY MORE! It's only left here for historical
- * reasons and because gdb uses it as a signature to notice
- * signal handler stack frames.
- */
- err |= __put_user(*((u64 *)&retcode), (u64 *)frame->retcode);
-
- if (err)
- return -EFAULT;
-
- /* Set up registers for signal handler */
- regs->sp = (unsigned long)frame;
- regs->ip = (unsigned long)ka->sa.sa_handler;
- regs->ax = (unsigned long)sig;
- regs->dx = 0;
- regs->cx = 0;
-
- regs->ds = __USER_DS;
- regs->es = __USER_DS;
- regs->ss = __USER_DS;
- regs->cs = __USER_CS;
-
- return 0;
-}
-
-static int __setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
- sigset_t *set, struct pt_regs *regs)
-{
- struct rt_sigframe __user *frame;
- void __user *restorer;
- int err = 0;
- void __user *fpstate = NULL;
-
- frame = get_sigframe(ka, regs, sizeof(*frame), &fpstate);
-
- if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
- return -EFAULT;
-
- 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, info);
- if (err)
- return -EFAULT;
-
- /* Create the ucontext. */
- if (cpu_has_xsave)
- err |= __put_user(UC_FP_XSTATE, &frame->uc.uc_flags);
- else
- err |= __put_user(0, &frame->uc.uc_flags);
- err |= __put_user(0, &frame->uc.uc_link);
- err |= __put_user(current->sas_ss_sp, &frame->uc.uc_stack.ss_sp);
- err |= __put_user(sas_ss_flags(regs->sp),
- &frame->uc.uc_stack.ss_flags);
- err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size);
- err |= setup_sigcontext(&frame->uc.uc_mcontext, fpstate,
- regs, set->sig[0]);
- err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
- if (err)
- return -EFAULT;
-
- /* Set up to return from userspace. */
- restorer = VDSO32_SYMBOL(current->mm->context.vdso, rt_sigreturn);
- if (ka->sa.sa_flags & SA_RESTORER)
- restorer = ka->sa.sa_restorer;
- err |= __put_user(restorer, &frame->pretcode);
-
- /*
- * This is movl $__NR_rt_sigreturn, %ax ; int $0x80
- *
- * WE DO NOT USE IT ANY MORE! It's only left here for historical
- * reasons and because gdb uses it as a signature to notice
- * signal handler stack frames.
- */
- err |= __put_user(*((u64 *)&rt_retcode), (u64 *)frame->retcode);
-
- if (err)
- return -EFAULT;
-
- /* Set up registers for signal handler */
- regs->sp = (unsigned long)frame;
- regs->ip = (unsigned long)ka->sa.sa_handler;
- regs->ax = (unsigned long)sig;
- regs->dx = (unsigned long)&frame->info;
- regs->cx = (unsigned long)&frame->uc;
-
- regs->ds = __USER_DS;
- regs->es = __USER_DS;
- regs->ss = __USER_DS;
- regs->cs = __USER_CS;
-
- return 0;
-}
-#else /* !CONFIG_X86_32 */
-/*
- * Determine which stack to use..
- */
-static void __user *
-get_stack(struct k_sigaction *ka, unsigned long sp, unsigned long size)
-{
- /* Default to using normal stack - redzone*/
- sp -= 128;
-
- /* This is the X/Open sanctioned signal stack switching. */
- if (ka->sa.sa_flags & SA_ONSTACK) {
- if (sas_ss_flags(sp) == 0)
- sp = current->sas_ss_sp + current->sas_ss_size;
- }
-
- return (void __user *)round_down(sp - size, 64);
-}
-
-static int __setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
- sigset_t *set, struct pt_regs *regs)
-{
- struct rt_sigframe __user *frame;
- void __user *fp = NULL;
- int err = 0;
- struct task_struct *me = current;
-
- if (used_math()) {
- fp = get_stack(ka, regs->sp, sig_xstate_size);
- frame = (void __user *)round_down(
- (unsigned long)fp - sizeof(struct rt_sigframe), 16) - 8;
-
- if (save_i387_xstate(fp) < 0)
- return -EFAULT;
- } else
- frame = get_stack(ka, regs->sp, sizeof(struct rt_sigframe)) - 8;
-
- if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
- return -EFAULT;
-
- if (ka->sa.sa_flags & SA_SIGINFO) {
- if (copy_siginfo_to_user(&frame->info, info))
- return -EFAULT;
- }
-
- /* Create the ucontext. */
- if (cpu_has_xsave)
- err |= __put_user(UC_FP_XSTATE, &frame->uc.uc_flags);
- else
- err |= __put_user(0, &frame->uc.uc_flags);
- err |= __put_user(0, &frame->uc.uc_link);
- err |= __put_user(me->sas_ss_sp, &frame->uc.uc_stack.ss_sp);
- err |= __put_user(sas_ss_flags(regs->sp),
- &frame->uc.uc_stack.ss_flags);
- err |= __put_user(me->sas_ss_size, &frame->uc.uc_stack.ss_size);
- err |= setup_sigcontext(&frame->uc.uc_mcontext, fp, regs, set->sig[0]);
- err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
-
- /* Set up to return from userspace. If provided, use a stub
- already in userspace. */
- /* x86-64 should always use SA_RESTORER. */
- if (ka->sa.sa_flags & SA_RESTORER) {
- err |= __put_user(ka->sa.sa_restorer, &frame->pretcode);
- } else {
- /* could use a vstub here */
- return -EFAULT;
- }
-
- if (err)
- return -EFAULT;
-
- /* Set up registers for signal handler */
- regs->di = sig;
- /* In case the signal handler was declared without prototypes */
- regs->ax = 0;
-
- /* This also works for non SA_SIGINFO handlers because they expect the
- next argument after the signal number on the stack. */
- regs->si = (unsigned long)&frame->info;
- regs->dx = (unsigned long)&frame->uc;
- regs->ip = (unsigned long) ka->sa.sa_handler;
-
- regs->sp = (unsigned long)frame;
-
- /* Set up the CS register to run signal handlers in 64-bit mode,
- even if the handler happens to be interrupting 32-bit code. */
- regs->cs = __USER_CS;
-
- return 0;
-}
-#endif /* CONFIG_X86_32 */
-
-#ifdef CONFIG_X86_32
-/*
- * Atomically swap in the new signal mask, and wait for a signal.
- */
-asmlinkage int
-sys_sigsuspend(int history0, int history1, old_sigset_t mask)
-{
- mask &= _BLOCKABLE;
- spin_lock_irq(¤t->sighand->siglock);
- current->saved_sigmask = current->blocked;
- siginitset(¤t->blocked, mask);
- recalc_sigpending();
- spin_unlock_irq(¤t->sighand->siglock);
-
- current->state = TASK_INTERRUPTIBLE;
- schedule();
- set_restore_sigmask();
-
- return -ERESTARTNOHAND;
-}
-
-asmlinkage int
-sys_sigaction(int sig, const struct old_sigaction __user *act,
- struct old_sigaction __user *oact)
-{
- struct k_sigaction new_ka, old_ka;
- int ret;
-
- if (act) {
- old_sigset_t mask;
-
- if (!access_ok(VERIFY_READ, act, sizeof(*act)) ||
- __get_user(new_ka.sa.sa_handler, &act->sa_handler) ||
- __get_user(new_ka.sa.sa_restorer, &act->sa_restorer))
- return -EFAULT;
-
- __get_user(new_ka.sa.sa_flags, &act->sa_flags);
- __get_user(mask, &act->sa_mask);
- siginitset(&new_ka.sa.sa_mask, mask);
- }
-
- ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
-
- if (!ret && oact) {
- if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) ||
- __put_user(old_ka.sa.sa_handler, &oact->sa_handler) ||
- __put_user(old_ka.sa.sa_restorer, &oact->sa_restorer))
- return -EFAULT;
-
- __put_user(old_ka.sa.sa_flags, &oact->sa_flags);
- __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask);
- }
-
- return ret;
-}
-#endif /* CONFIG_X86_32 */
-
-#ifdef CONFIG_X86_32
-asmlinkage int sys_sigaltstack(unsigned long bx)
-{
- /*
- * This is needed to make gcc realize it doesn't own the
- * "struct pt_regs"
- */
- struct pt_regs *regs = (struct pt_regs *)&bx;
- const stack_t __user *uss = (const stack_t __user *)bx;
- stack_t __user *uoss = (stack_t __user *)regs->cx;
-
- return do_sigaltstack(uss, uoss, regs->sp);
-}
-#else /* !CONFIG_X86_32 */
-asmlinkage long
-sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss,
- struct pt_regs *regs)
-{
- return do_sigaltstack(uss, uoss, regs->sp);
-}
-#endif /* CONFIG_X86_32 */
-
-/*
- * Do a signal return; undo the signal stack.
- */
-#ifdef CONFIG_X86_32
-asmlinkage unsigned long sys_sigreturn(unsigned long __unused)
-{
- struct sigframe __user *frame;
- struct pt_regs *regs;
- unsigned long ax;
- sigset_t set;
-
- regs = (struct pt_regs *) &__unused;
- frame = (struct sigframe __user *)(regs->sp - 8);
-
- if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
- goto badframe;
- if (__get_user(set.sig[0], &frame->sc.oldmask) || (_NSIG_WORDS > 1
- && __copy_from_user(&set.sig[1], &frame->extramask,
- sizeof(frame->extramask))))
- goto badframe;
-
- sigdelsetmask(&set, ~_BLOCKABLE);
- spin_lock_irq(¤t->sighand->siglock);
- current->blocked = set;
- recalc_sigpending();
- spin_unlock_irq(¤t->sighand->siglock);
-
- if (restore_sigcontext(regs, &frame->sc, &ax))
- goto badframe;
- return ax;
-
-badframe:
- if (show_unhandled_signals && printk_ratelimit()) {
- printk("%s%s[%d] bad frame in sigreturn frame:"
- "%p ip:%lx sp:%lx oeax:%lx",
- task_pid_nr(current) > 1 ? KERN_INFO : KERN_EMERG,
- current->comm, task_pid_nr(current), frame, regs->ip,
- regs->sp, regs->orig_ax);
- print_vma_addr(" in ", regs->ip);
- printk(KERN_CONT "\n");
- }
-
- force_sig(SIGSEGV, current);
-
- return 0;
-}
-#endif /* CONFIG_X86_32 */
-
-static long do_rt_sigreturn(struct pt_regs *regs)
-{
- struct rt_sigframe __user *frame;
- unsigned long ax;
- sigset_t set;
-
- frame = (struct rt_sigframe __user *)(regs->sp - sizeof(long));
- if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
- goto badframe;
- if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
- goto badframe;
-
- sigdelsetmask(&set, ~_BLOCKABLE);
- spin_lock_irq(¤t->sighand->siglock);
- current->blocked = set;
- recalc_sigpending();
- spin_unlock_irq(¤t->sighand->siglock);
-
- if (restore_sigcontext(regs, &frame->uc.uc_mcontext, &ax))
- goto badframe;
-
- if (do_sigaltstack(&frame->uc.uc_stack, NULL, regs->sp) == -EFAULT)
- goto badframe;
-
- return ax;
-
-badframe:
- signal_fault(regs, frame, "rt_sigreturn");
- return 0;
-}
-
-#ifdef CONFIG_X86_32
-asmlinkage int sys_rt_sigreturn(unsigned long __unused)
-{
- struct pt_regs *regs = (struct pt_regs *)&__unused;
-
- return do_rt_sigreturn(regs);
-}
-#else /* !CONFIG_X86_32 */
-asmlinkage long sys_rt_sigreturn(struct pt_regs *regs)
-{
- return do_rt_sigreturn(regs);
-}
-#endif /* CONFIG_X86_32 */
-
-/*
- * OK, we're invoking a handler:
- */
-static int signr_convert(int sig)
-{
-#ifdef CONFIG_X86_32
- struct thread_info *info = current_thread_info();
-
- if (info->exec_domain && info->exec_domain->signal_invmap && sig < 32)
- return info->exec_domain->signal_invmap[sig];
-#endif /* CONFIG_X86_32 */
- return sig;
-}
-
-#ifdef CONFIG_X86_32
-
-#define is_ia32 1
-#define ia32_setup_frame __setup_frame
-#define ia32_setup_rt_frame __setup_rt_frame
-
-#else /* !CONFIG_X86_32 */
-
-#ifdef CONFIG_IA32_EMULATION
-#define is_ia32 test_thread_flag(TIF_IA32)
-#else /* !CONFIG_IA32_EMULATION */
-#define is_ia32 0
-#endif /* CONFIG_IA32_EMULATION */
-
-#endif /* CONFIG_X86_32 */
-
-static int
-setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
- sigset_t *set, struct pt_regs *regs)
-{
- int usig = signr_convert(sig);
- int ret;
-
- /* Set up the stack frame */
- if (is_ia32) {
- if (ka->sa.sa_flags & SA_SIGINFO)
- ret = ia32_setup_rt_frame(usig, ka, info, set, regs);
- else
- ret = ia32_setup_frame(usig, ka, set, regs);
- } else
- ret = __setup_rt_frame(sig, ka, info, set, regs);
-
- if (ret) {
- force_sigsegv(sig, current);
- return -EFAULT;
- }
-
- return ret;
-}
-
-static int
-handle_signal(unsigned long sig, siginfo_t *info, struct k_sigaction *ka,
- sigset_t *oldset, struct pt_regs *regs)
-{
- int ret;
-
- /* Are we from a system call? */
- if (syscall_get_nr(current, regs) >= 0) {
- /* If so, check system call restarting.. */
- switch (syscall_get_error(current, regs)) {
- case -ERESTART_RESTARTBLOCK:
- case -ERESTARTNOHAND:
- regs->ax = -EINTR;
- break;
-
- case -ERESTARTSYS:
- if (!(ka->sa.sa_flags & SA_RESTART)) {
- regs->ax = -EINTR;
- break;
- }
- /* fallthrough */
- case -ERESTARTNOINTR:
- regs->ax = regs->orig_ax;
- regs->ip -= 2;
- break;
- }
- }
-
- /*
- * If TF is set due to a debugger (TIF_FORCED_TF), clear the TF
- * flag so that register information in the sigcontext is correct.
- */
- if (unlikely(regs->flags & X86_EFLAGS_TF) &&
- likely(test_and_clear_thread_flag(TIF_FORCED_TF)))
- regs->flags &= ~X86_EFLAGS_TF;
-
- ret = setup_rt_frame(sig, ka, info, oldset, regs);
-
- if (ret)
- return ret;
-
-#ifdef CONFIG_X86_64
- /*
- * This has nothing to do with segment registers,
- * despite the name. This magic affects uaccess.h
- * macros' behavior. Reset it to the normal setting.
- */
- set_fs(USER_DS);
-#endif
-
- /*
- * Clear the direction flag as per the ABI for function entry.
- */
- regs->flags &= ~X86_EFLAGS_DF;
-
- /*
- * Clear TF when entering the signal handler, but
- * notify any tracer that was single-stepping it.
- * The tracer may want to single-step inside the
- * handler too.
- */
- regs->flags &= ~X86_EFLAGS_TF;
-
- spin_lock_irq(¤t->sighand->siglock);
- sigorsets(¤t->blocked, ¤t->blocked, &ka->sa.sa_mask);
- if (!(ka->sa.sa_flags & SA_NODEFER))
- sigaddset(¤t->blocked, sig);
- recalc_sigpending();
- spin_unlock_irq(¤t->sighand->siglock);
-
- tracehook_signal_handler(sig, info, ka, regs,
- test_thread_flag(TIF_SINGLESTEP));
-
- return 0;
-}
-
-#ifdef CONFIG_X86_32
-#define NR_restart_syscall __NR_restart_syscall
-#else /* !CONFIG_X86_32 */
-#define NR_restart_syscall \
- test_thread_flag(TIF_IA32) ? __NR_ia32_restart_syscall : __NR_restart_syscall
-#endif /* CONFIG_X86_32 */
-
-/*
- * 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 k_sigaction ka;
- siginfo_t info;
- int signr;
- sigset_t *oldset;
-
- /*
- * We want the common case to go fast, which is why we may in certain
- * cases get here from kernel mode. Just return without doing anything
- * if so.
- * X86_32: vm86 regs switched out by assembly code before reaching
- * here, so testing against kernel CS suffices.
- */
- if (!user_mode(regs))
- return;
-
- if (current_thread_info()->status & TS_RESTORE_SIGMASK)
- oldset = ¤t->saved_sigmask;
- else
- oldset = ¤t->blocked;
-
- signr = get_signal_to_deliver(&info, &ka, regs, NULL);
- if (signr > 0) {
- /*
- * Re-enable any watchpoints before delivering the
- * signal to user space. The processor register will
- * have been cleared if the watchpoint triggered
- * inside the kernel.
- */
- if (current->thread.debugreg7)
- set_debugreg(current->thread.debugreg7, 7);
-
- /* Whee! Actually deliver the signal. */
- if (handle_signal(signr, &info, &ka, oldset, regs) == 0) {
- /*
- * A signal was successfully delivered; the saved
- * sigmask will have been stored in the signal frame,
- * and will be restored by sigreturn, so we can simply
- * clear the TS_RESTORE_SIGMASK flag.
- */
- current_thread_info()->status &= ~TS_RESTORE_SIGMASK;
- }
- return;
- }
-
- /* Did we come from a system call? */
- if (syscall_get_nr(current, regs) >= 0) {
- /* Restart the system call - no handlers present */
- switch (syscall_get_error(current, regs)) {
- case -ERESTARTNOHAND:
- case -ERESTARTSYS:
- case -ERESTARTNOINTR:
- regs->ax = regs->orig_ax;
- regs->ip -= 2;
- break;
-
- case -ERESTART_RESTARTBLOCK:
- regs->ax = NR_restart_syscall;
- regs->ip -= 2;
- break;
- }
- }
-
- /*
- * If there's no signal to deliver, we just put the saved sigmask
- * back.
- */
- if (current_thread_info()->status & TS_RESTORE_SIGMASK) {
- current_thread_info()->status &= ~TS_RESTORE_SIGMASK;
- sigprocmask(SIG_SETMASK, ¤t->saved_sigmask, NULL);
- }
-}
-
-/*
- * notification of userspace execution resumption
- * - triggered by the TIF_WORK_MASK flags
- */
-void
-do_notify_resume(struct pt_regs *regs, void *unused, __u32 thread_info_flags)
-{
-#if defined(CONFIG_X86_64) && defined(CONFIG_X86_MCE)
- /* notify userspace of pending MCEs */
- if (thread_info_flags & _TIF_MCE_NOTIFY)
- mce_notify_user();
-#endif /* CONFIG_X86_64 && CONFIG_X86_MCE */
-
- /* deal with pending signal delivery */
- if (thread_info_flags & _TIF_SIGPENDING)
- do_signal(regs);
-
- if (thread_info_flags & _TIF_NOTIFY_RESUME) {
- clear_thread_flag(TIF_NOTIFY_RESUME);
- tracehook_notify_resume(regs);
- }
-
-#ifdef CONFIG_X86_32
- clear_thread_flag(TIF_IRET);
-#endif /* CONFIG_X86_32 */
-}
-
-void signal_fault(struct pt_regs *regs, void __user *frame, char *where)
-{
- struct task_struct *me = current;
-
- if (show_unhandled_signals && printk_ratelimit()) {
- printk(KERN_INFO
- "%s[%d] bad frame in %s frame:%p ip:%lx sp:%lx orax:%lx",
- me->comm, me->pid, where, frame,
- regs->ip, regs->sp, regs->orig_ax);
- print_vma_addr(" in ", regs->ip);
- printk(KERN_CONT "\n");
- }
-
- force_sig(SIGSEGV, me);
-}
git://ftp.safe.ca / safe / jmp / linux-2.6 / commitdiff