patch-2.4.20 linux-2.4.20/arch/x86_64/ia32/ia32_signal.c
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- Lines: 525
- Date:
Thu Nov 28 15:53:12 2002
- Orig file:
linux-2.4.19/arch/x86_64/ia32/ia32_signal.c
- Orig date:
Wed Dec 31 16:00:00 1969
diff -urN linux-2.4.19/arch/x86_64/ia32/ia32_signal.c linux-2.4.20/arch/x86_64/ia32/ia32_signal.c
@@ -0,0 +1,524 @@
+/*
+ * linux/arch/x86_64/ia32/ia32_signal.c
+ *
+ * Copyright (C) 1991, 1992 Linus Torvalds
+ *
+ * 1997-11-28 Modified for POSIX.1b signals by Richard Henderson
+ * 2000-06-20 Pentium III FXSR, SSE support by Gareth Hughes
+ * 2000-12-* x86-64 compatibility mode signal handling by Andi Kleen
+ *
+ * $Id: ia32_signal.c,v 1.22 2002/07/29 10:34:03 ak Exp $
+ */
+
+#include <linux/sched.h>
+#include <linux/mm.h>
+#include <linux/smp.h>
+#include <linux/smp_lock.h>
+#include <linux/kernel.h>
+#include <linux/signal.h>
+#include <linux/errno.h>
+#include <linux/wait.h>
+#include <linux/ptrace.h>
+#include <linux/unistd.h>
+#include <linux/stddef.h>
+#include <linux/personality.h>
+#include <asm/ucontext.h>
+#include <asm/uaccess.h>
+#include <asm/i387.h>
+#include <asm/ia32.h>
+#include <asm/ptrace.h>
+#include <asm/ia32_unistd.h>
+#include <asm/user32.h>
+#include <asm/sigcontext32.h>
+#include <asm/fpu32.h>
+
+#define ptr_to_u32(x) ((u32)(u64)(x)) /* avoid gcc warning */
+
+#define DEBUG_SIG 0
+
+#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
+
+asmlinkage int do_signal(struct pt_regs *regs, sigset_t *oldset);
+void signal_fault(struct pt_regs *regs, void *frame, char *where);
+
+static int ia32_copy_siginfo_to_user(siginfo_t32 *to, siginfo_t *from)
+{
+ if (!access_ok (VERIFY_WRITE, to, sizeof(siginfo_t)))
+ return -EFAULT;
+ if (from->si_code < 0)
+ return __copy_to_user(to, from, sizeof(siginfo_t));
+ else {
+ int err;
+
+ /* If you change siginfo_t structure, please be sure
+ this code is fixed accordingly.
+ It should never copy any pad contained in the structure
+ to avoid security leaks, but must copy the generic
+ 3 ints plus the relevant union member. */
+ err = __put_user(from->si_signo, &to->si_signo);
+ err |= __put_user(from->si_errno, &to->si_errno);
+ err |= __put_user((short)from->si_code, &to->si_code);
+ /* First 32bits of unions are always present. */
+ err |= __put_user(from->si_pid, &to->si_pid);
+ switch (from->si_code >> 16) {
+ case __SI_FAULT >> 16:
+ break;
+ case __SI_CHLD >> 16:
+ err |= __put_user(from->si_utime, &to->si_utime);
+ err |= __put_user(from->si_stime, &to->si_stime);
+ err |= __put_user(from->si_status, &to->si_status);
+ default:
+ err |= __put_user(from->si_uid, &to->si_uid);
+ break;
+ /* case __SI_RT: This is not generated by the kernel as of now. */
+ }
+ return err;
+ }
+}
+
+asmlinkage int
+sys32_sigsuspend(int history0, int history1, old_sigset_t mask, struct pt_regs regs)
+{
+ sigset_t saveset;
+
+ mask &= _BLOCKABLE;
+ spin_lock_irq(¤t->sigmask_lock);
+ saveset = current->blocked;
+ siginitset(¤t->blocked, mask);
+ recalc_sigpending(current);
+ spin_unlock_irq(¤t->sigmask_lock);
+
+ regs.rax = -EINTR;
+ while (1) {
+ current->state = TASK_INTERRUPTIBLE;
+ schedule();
+ if (do_signal(®s, &saveset))
+ return -EINTR;
+ }
+}
+
+asmlinkage int
+sys32_sigaltstack(const stack_ia32_t *uss_ptr, stack_ia32_t *uoss_ptr,
+ struct pt_regs regs)
+{
+ stack_t uss,uoss;
+ int ret;
+ mm_segment_t seg;
+ if (!access_ok(VERIFY_READ,uss_ptr,sizeof(stack_ia32_t)) ||
+ __get_user(ptr_to_u32(uss.ss_sp), &uss_ptr->ss_sp) ||
+ __get_user((u32)uss.ss_flags, &uss_ptr->ss_flags) ||
+ __get_user((u32)uss.ss_size, &uss_ptr->ss_size))
+ return -EFAULT;
+ seg = get_fs();
+ set_fs(KERNEL_DS);
+ ret = do_sigaltstack(&uss, &uoss, regs.rsp);
+ set_fs(seg);
+ if (ret >= 0 && uoss_ptr) {
+ if (!access_ok(VERIFY_WRITE,uss_ptr,sizeof(stack_ia32_t)) ||
+ __put_user(ptr_to_u32(uss.ss_sp), &uss_ptr->ss_sp) ||
+ __put_user((u32)uss.ss_flags, &uss_ptr->ss_flags) ||
+ __put_user((u32)uss.ss_size, &uss_ptr->ss_size))
+ ret = -EFAULT;
+ }
+ return ret;
+}
+
+/*
+ * Do a signal return; undo the signal stack.
+ */
+
+struct sigframe
+{
+ u32 pretcode;
+ int sig;
+ struct sigcontext_ia32 sc;
+ struct _fpstate_ia32 fpstate;
+ unsigned int extramask[_IA32_NSIG_WORDS-1];
+ char retcode[8];
+};
+
+struct rt_sigframe
+{
+ u32 pretcode;
+ int sig;
+ u32 pinfo;
+ u32 puc;
+ struct siginfo32 info;
+ struct ucontext_ia32 uc;
+ struct _fpstate_ia32 fpstate;
+ char retcode[8];
+};
+
+static int
+ia32_restore_sigcontext(struct pt_regs *regs, struct sigcontext_ia32 *sc, unsigned int *peax)
+{
+ unsigned int err = 0;
+
+#if DEBUG_SIG
+ printk("SIG restore_sigcontext: sc=%p err(%x) eip(%x) cs(%x) flg(%x)\n",
+ sc, sc->err, sc->eip, sc->cs, sc->eflags);
+#endif
+#define COPY(x) { \
+ unsigned int reg; \
+ err |= __get_user(reg, &sc->e ##x); \
+ regs->r ## x = reg; \
+}
+
+#define RELOAD_SEG(seg,mask) \
+ { unsigned int cur; \
+ unsigned short pre; \
+ err |= __get_user(pre, &sc->seg); \
+ asm volatile("movl %%" #seg ",%0" : "=r" (cur)); \
+ pre |= mask; \
+ if (pre != cur) loadsegment(seg,pre); }
+
+ /* Reload fs and gs if they have changed in the signal handler.
+ This does not handle long fs/gs base changes in the handler, but
+ does not clobber them at least in the normal case. */
+
+ {
+ unsigned short gs;
+ err |= __get_user(gs, &sc->gs);
+ load_gs_index(gs);
+ }
+ RELOAD_SEG(fs,0);
+ RELOAD_SEG(ds,0);
+ RELOAD_SEG(es,0);
+
+ COPY(di); COPY(si); COPY(bp); COPY(sp); COPY(bx);
+ COPY(dx); COPY(cx); COPY(ip);
+ /* Don't touch extended registers */
+
+#if 1 /* not ready for this yet */
+ err |= __get_user(regs->cs, &sc->cs);
+ regs->cs |= 2;
+ err |= __get_user(regs->ss, &sc->ss);
+ regs->ss |= 2;
+#else
+ regs->cs = __USER32_CS;
+ regs->ss = __USER32_DS;
+#endif
+
+ {
+ unsigned int tmpflags;
+ err |= __get_user(tmpflags, &sc->eflags);
+ regs->eflags = (regs->eflags & ~0x40DD5) | (tmpflags & 0x40DD5);
+ regs->orig_rax = -1; /* disable syscall checks */
+ }
+
+ {
+ u32 tmp;
+ struct _fpstate_ia32 * buf;
+ err |= __get_user(tmp, &sc->fpstate);
+ buf = (struct _fpstate_ia32 *) (u64)tmp;
+ if (buf) {
+ if (verify_area(VERIFY_READ, buf, sizeof(*buf)))
+ goto badframe;
+ err |= restore_i387_ia32(current, buf, 0);
+ }
+ }
+
+ {
+ u32 tmp;
+ err |= __get_user(tmp, &sc->eax);
+ *peax = tmp;
+ }
+ return err;
+
+badframe:
+ return 1;
+}
+
+asmlinkage int sys32_sigreturn(struct pt_regs regs)
+{
+ struct sigframe *frame = (struct sigframe *)(regs.rsp - 8);
+ sigset_t set;
+ unsigned int eax;
+
+ if (verify_area(VERIFY_READ, frame, sizeof(*frame)))
+ goto badframe;
+ if (__get_user(set.sig[0], &frame->sc.oldmask)
+ || (_IA32_NSIG_WORDS > 1
+ && __copy_from_user((((char *) &set.sig) + 4), &frame->extramask,
+ sizeof(frame->extramask))))
+ goto badframe;
+
+ sigdelsetmask(&set, ~_BLOCKABLE);
+ spin_lock_irq(¤t->sigmask_lock);
+ current->blocked = set;
+ recalc_sigpending(current);
+ spin_unlock_irq(¤t->sigmask_lock);
+
+ if (ia32_restore_sigcontext(®s, &frame->sc, &eax))
+ goto badframe;
+ return eax;
+
+badframe:
+ signal_fault(®s,frame,"32bit sigreturn");
+ return 0;
+}
+
+asmlinkage int sys32_rt_sigreturn(struct pt_regs regs)
+{
+ struct rt_sigframe *frame = (struct rt_sigframe *)(regs.rsp - 4);
+ sigset_t set;
+ stack_t st;
+ unsigned int eax;
+
+ if (verify_area(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->sigmask_lock);
+ current->blocked = set;
+ recalc_sigpending(current);
+ spin_unlock_irq(¤t->sigmask_lock);
+
+ if (ia32_restore_sigcontext(®s, &frame->uc.uc_mcontext, &eax))
+ goto badframe;
+
+ if (__copy_from_user(&st, &frame->uc.uc_stack, sizeof(st)))
+ goto badframe;
+ /* It is more difficult to avoid calling this function than to
+ call it and ignore errors. */
+ {
+ mm_segment_t oldds = get_fs();
+ set_fs(KERNEL_DS);
+ do_sigaltstack(&st, NULL, regs.rsp);
+ set_fs(oldds);
+ }
+
+ return eax;
+
+badframe:
+ signal_fault(®s,frame,"32bit rt sigreturn");
+ return 0;
+}
+
+/*
+ * Set up a signal frame.
+ */
+
+static int
+ia32_setup_sigcontext(struct sigcontext_ia32 *sc, struct _fpstate_ia32 *fpstate,
+ struct pt_regs *regs, unsigned int mask)
+{
+ int tmp, err = 0;
+
+ tmp = 0;
+ __asm__("movl %%gs,%0" : "=r"(tmp): "0"(tmp));
+ err |= __put_user(tmp, (unsigned int *)&sc->gs);
+ __asm__("movl %%fs,%0" : "=r"(tmp): "0"(tmp));
+ err |= __put_user(tmp, (unsigned int *)&sc->fs);
+ __asm__("movl %%ds,%0" : "=r"(tmp): "0"(tmp));
+ err |= __put_user(tmp, (unsigned int *)&sc->ds);
+ __asm__("movl %%es,%0" : "=r"(tmp): "0"(tmp));
+ err |= __put_user(tmp, (unsigned int *)&sc->es);
+
+ err |= __put_user((u32)regs->rdi, &sc->edi);
+ err |= __put_user((u32)regs->rsi, &sc->esi);
+ err |= __put_user((u32)regs->rbp, &sc->ebp);
+ err |= __put_user((u32)regs->rsp, &sc->esp);
+ err |= __put_user((u32)regs->rbx, &sc->ebx);
+ err |= __put_user((u32)regs->rdx, &sc->edx);
+ err |= __put_user((u32)regs->rcx, &sc->ecx);
+ err |= __put_user((u32)regs->rax, &sc->eax);
+ err |= __put_user((u32)regs->cs, &sc->cs);
+ err |= __put_user((u32)regs->ss, &sc->ss);
+ err |= __put_user(current->thread.trap_no, &sc->trapno);
+ err |= __put_user(current->thread.error_code, &sc->err);
+ err |= __put_user((u32)regs->rip, &sc->eip);
+ err |= __put_user((u32)regs->eflags, &sc->eflags);
+ err |= __put_user((u32)regs->rsp, &sc->esp_at_signal);
+
+ tmp = save_i387_ia32(current, fpstate, regs, 0);
+ if (tmp < 0)
+ err = -EFAULT;
+ else
+ err |= __put_user((u32)(u64)(tmp ? fpstate : NULL), &sc->fpstate);
+
+ /* non-iBCS2 extensions.. */
+ err |= __put_user(mask, &sc->oldmask);
+ err |= __put_user(current->thread.cr2, &sc->cr2);
+
+ return err;
+}
+
+/*
+ * Determine which stack to use..
+ */
+static inline void *
+get_sigframe(struct k_sigaction *ka, struct pt_regs * regs, size_t frame_size)
+{
+ unsigned long rsp;
+
+ /* Default to using normal stack */
+ rsp = regs->rsp;
+
+ /* This is the X/Open sanctioned signal stack switching. */
+ if (ka->sa.sa_flags & SA_ONSTACK) {
+ if (! on_sig_stack(rsp))
+ rsp = current->sas_ss_sp + current->sas_ss_size;
+ }
+
+ /* This is the legacy signal stack switching. */
+ else if ((regs->ss & 0xffff) != __USER_DS &&
+ !(ka->sa.sa_flags & SA_RESTORER) &&
+ ka->sa.sa_restorer) {
+ rsp = (unsigned long) ka->sa.sa_restorer;
+ }
+
+ return (void *)((rsp - frame_size) & -8UL);
+}
+
+void ia32_setup_frame(int sig, struct k_sigaction *ka,
+ sigset32_t *set, struct pt_regs * regs)
+{
+ struct sigframe *frame;
+ int err = 0;
+
+ frame = get_sigframe(ka, regs, sizeof(*frame));
+
+ if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
+ goto give_sigsegv;
+
+ err |= __put_user((current->exec_domain
+ && current->exec_domain->signal_invmap
+ && sig < 32
+ ? current->exec_domain->signal_invmap[sig]
+ : sig),
+ &frame->sig);
+ if (err)
+ goto give_sigsegv;
+
+ err |= ia32_setup_sigcontext(&frame->sc, &frame->fpstate, regs, set->sig[0]);
+ if (err)
+ goto give_sigsegv;
+
+ if (_IA32_NSIG_WORDS > 1) {
+ err |= __copy_to_user(frame->extramask, &set->sig[1],
+ sizeof(frame->extramask));
+ }
+ if (err)
+ goto give_sigsegv;
+
+ /* Set up to return from userspace. If provided, use a stub
+ already in userspace. */
+ if (ka->sa.sa_flags & SA_RESTORER) {
+ err |= __put_user((u32)(u64)ka->sa.sa_restorer, &frame->pretcode);
+ } else {
+ err |= __put_user((u32)(u64)frame->retcode, &frame->pretcode);
+ /* This is popl %eax ; movl $,%eax ; int $0x80 */
+ err |= __put_user((u16)0xb858, (short *)(frame->retcode+0));
+ err |= __put_user((u32)__NR_ia32_sigreturn, (int *)(frame->retcode+2));
+ err |= __put_user((u16)0x80cd, (short *)(frame->retcode+6));
+ }
+
+ if (err)
+ goto give_sigsegv;
+
+ /* Set up registers for signal handler */
+ regs->rsp = (unsigned long) frame;
+ regs->rip = (unsigned long) ka->sa.sa_handler;
+
+ asm volatile("movl %0,%%ds" :: "r" (__USER32_DS));
+ asm volatile("movl %0,%%es" :: "r" (__USER32_DS));
+
+ regs->cs = __USER32_CS;
+ regs->ss = __USER32_DS;
+
+ set_fs(USER_DS);
+ regs->eflags &= ~TF_MASK;
+
+#if DEBUG_SIG
+ printk("SIG deliver (%s:%d): sp=%p pc=%p ra=%p\n",
+ current->comm, current->pid, frame, regs->rip, frame->pretcode);
+#endif
+
+ return;
+
+give_sigsegv:
+ if (sig == SIGSEGV)
+ ka->sa.sa_handler = SIG_DFL;
+ signal_fault(regs,frame,"32bit signal deliver");
+}
+
+void ia32_setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
+ sigset32_t *set, struct pt_regs * regs)
+{
+ struct rt_sigframe *frame;
+ int err = 0;
+
+ frame = get_sigframe(ka, regs, sizeof(*frame));
+
+ if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
+ goto give_sigsegv;
+
+ err |= __put_user((current->exec_domain
+ && current->exec_domain->signal_invmap
+ && sig < 32
+ ? current->exec_domain->signal_invmap[sig]
+ : sig),
+ &frame->sig);
+ err |= __put_user((u32)(u64)&frame->info, &frame->pinfo);
+ err |= __put_user((u32)(u64)&frame->uc, &frame->puc);
+ err |= ia32_copy_siginfo_to_user(&frame->info, info);
+ if (err)
+ goto give_sigsegv;
+
+ /* Create the ucontext. */
+ 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->rsp),
+ &frame->uc.uc_stack.ss_flags);
+ err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size);
+ err |= ia32_setup_sigcontext(&frame->uc.uc_mcontext, &frame->fpstate,
+ regs, set->sig[0]);
+ err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
+ if (err)
+ goto give_sigsegv;
+
+ /* Set up to return from userspace. If provided, use a stub
+ already in userspace. */
+ if (ka->sa.sa_flags & SA_RESTORER) {
+ err |= __put_user((u32)(u64)ka->sa.sa_restorer, &frame->pretcode);
+ } else {
+ err |= __put_user(ptr_to_u32(frame->retcode), &frame->pretcode);
+ /* This is movl $,%eax ; int $0x80 */
+ err |= __put_user(0xb8, (char *)(frame->retcode+0));
+ err |= __put_user((u32)__NR_ia32_rt_sigreturn, (int *)(frame->retcode+1));
+ err |= __put_user(0x80cd, (short *)(frame->retcode+5));
+ }
+
+ if (err)
+ goto give_sigsegv;
+
+ /* Set up registers for signal handler */
+ regs->rsp = (unsigned long) frame;
+ regs->rip = (unsigned long) ka->sa.sa_handler;
+
+ asm volatile("movl %0,%%ds" :: "r" (__USER32_DS));
+ asm volatile("movl %0,%%es" :: "r" (__USER32_DS));
+
+ regs->cs = __USER32_CS;
+ regs->ss = __USER32_DS;
+
+ set_fs(USER_DS);
+ regs->eflags &= ~TF_MASK;
+
+#if DEBUG_SIG
+ printk("SIG deliver (%s:%d): sp=%p pc=%p ra=%p\n",
+ current->comm, current->pid, frame, regs->rip, frame->pretcode);
+#endif
+
+ return;
+
+give_sigsegv:
+ if (sig == SIGSEGV)
+ ka->sa.sa_handler = SIG_DFL;
+ signal_fault(regs,frame,"32bit rt signal deliver");
+}
+
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