#include <linux/stddef.h>
#include <linux/personality.h>
#include <linux/compiler.h>
+#include <asm/processor.h>
#include <asm/ucontext.h>
#include <asm/uaccess.h>
#include <asm/i387.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
+
int ia32_setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
sigset_t *set, struct pt_regs * regs);
int ia32_setup_frame(int sig, struct k_sigaction *ka,
sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss,
struct pt_regs *regs)
{
- return do_sigaltstack(uss, uoss, regs->rsp);
+ return do_sigaltstack(uss, uoss, regs->sp);
}
#define COPY(x) err |= __get_user(regs->x, &sc->x)
- COPY(rdi); COPY(rsi); COPY(rbp); COPY(rsp); COPY(rbx);
- COPY(rdx); COPY(rcx); COPY(rip);
+ COPY(di); COPY(si); COPY(bp); COPY(sp); COPY(bx);
+ COPY(dx); COPY(cx); COPY(ip);
COPY(r8);
COPY(r9);
COPY(r10);
{
unsigned int tmpflags;
- err |= __get_user(tmpflags, &sc->eflags);
- regs->eflags = (regs->eflags & ~0x40DD5) | (tmpflags & 0x40DD5);
- regs->orig_rax = -1; /* disable syscall checks */
+ 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(*prax, &sc->rax);
+ err |= __get_user(*prax, &sc->ax);
return err;
badframe:
{
struct rt_sigframe __user *frame;
sigset_t set;
- unsigned long eax;
+ unsigned long ax;
- frame = (struct rt_sigframe __user *)(regs->rsp - 8);
- if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) {
+ 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))) {
+ if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
goto badframe;
- }
sigdelsetmask(&set, ~_BLOCKABLE);
spin_lock_irq(¤t->sighand->siglock);
recalc_sigpending();
spin_unlock_irq(¤t->sighand->siglock);
- if (restore_sigcontext(regs, &frame->uc.uc_mcontext, &eax))
+ if (restore_sigcontext(regs, &frame->uc.uc_mcontext, &ax))
goto badframe;
#ifdef DEBUG_SIG
- printk("%d sigreturn rip:%lx rsp:%lx frame:%p rax:%lx\n",current->pid,regs->rip,regs->rsp,frame,eax);
+ printk("%d sigreturn ip:%lx sp:%lx frame:%p ax:%lx\n",current->pid,regs->ip,regs->sp,frame,ax);
#endif
- if (do_sigaltstack(&frame->uc.uc_stack, NULL, regs->rsp) == -EFAULT)
+ if (do_sigaltstack(&frame->uc.uc_stack, NULL, regs->sp) == -EFAULT)
goto badframe;
- return eax;
+ return ax;
badframe:
signal_fault(regs,frame,"sigreturn");
err |= __put_user(0, &sc->gs);
err |= __put_user(0, &sc->fs);
- err |= __put_user(regs->rdi, &sc->rdi);
- err |= __put_user(regs->rsi, &sc->rsi);
- err |= __put_user(regs->rbp, &sc->rbp);
- err |= __put_user(regs->rsp, &sc->rsp);
- err |= __put_user(regs->rbx, &sc->rbx);
- err |= __put_user(regs->rdx, &sc->rdx);
- err |= __put_user(regs->rcx, &sc->rcx);
- err |= __put_user(regs->rax, &sc->rax);
+ 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);
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->r15, &sc->r15);
err |= __put_user(me->thread.trap_no, &sc->trapno);
err |= __put_user(me->thread.error_code, &sc->err);
- err |= __put_user(regs->rip, &sc->rip);
- err |= __put_user(regs->eflags, &sc->eflags);
+ err |= __put_user(regs->ip, &sc->ip);
+ err |= __put_user(regs->flags, &sc->flags);
err |= __put_user(mask, &sc->oldmask);
err |= __put_user(me->thread.cr2, &sc->cr2);
static void __user *
get_stack(struct k_sigaction *ka, struct pt_regs *regs, unsigned long size)
{
- unsigned long rsp;
+ unsigned long sp;
/* Default to using normal stack - redzone*/
- rsp = regs->rsp - 128;
+ sp = regs->sp - 128;
/* This is the X/Open sanctioned signal stack switching. */
if (ka->sa.sa_flags & SA_ONSTACK) {
- if (sas_ss_flags(rsp) == 0)
- rsp = current->sas_ss_sp + current->sas_ss_size;
+ if (sas_ss_flags(sp) == 0)
+ sp = current->sas_ss_sp + current->sas_ss_size;
}
- return (void __user *)round_down(rsp - size, 16);
+ return (void __user *)round_down(sp - size, 16);
}
static int setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
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->rsp),
+ 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, regs, set->sig[0], me);
goto give_sigsegv;
#ifdef DEBUG_SIG
- printk("%d old rip %lx old rsp %lx old rax %lx\n", current->pid,regs->rip,regs->rsp,regs->rax);
+ printk("%d old ip %lx old sp %lx old ax %lx\n", current->pid,regs->ip,regs->sp,regs->ax);
#endif
/* Set up registers for signal handler */
- regs->rdi = sig;
+ regs->di = sig;
/* In case the signal handler was declared without prototypes */
- regs->rax = 0;
+ 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->rsi = (unsigned long)&frame->info;
- regs->rdx = (unsigned long)&frame->uc;
- regs->rip = (unsigned long) ka->sa.sa_handler;
+ regs->si = (unsigned long)&frame->info;
+ regs->dx = (unsigned long)&frame->uc;
+ regs->ip = (unsigned long) ka->sa.sa_handler;
- regs->rsp = (unsigned long)frame;
+ 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. */
see include/asm-x86_64/uaccess.h for details. */
set_fs(USER_DS);
- regs->eflags &= ~TF_MASK;
+ regs->flags &= ~(X86_EFLAGS_TF | X86_EFLAGS_DF);
if (test_thread_flag(TIF_SINGLESTEP))
ptrace_notify(SIGTRAP);
#ifdef DEBUG_SIG
printk("SIG deliver (%s:%d): sp=%p pc=%lx ra=%p\n",
- current->comm, current->pid, frame, regs->rip, frame->pretcode);
+ current->comm, current->pid, frame, regs->ip, frame->pretcode);
#endif
return 0;
return -EFAULT;
}
+/*
+ * Return -1L or the syscall number that @regs is executing.
+ */
+static long current_syscall(struct pt_regs *regs)
+{
+ /*
+ * We always sign-extend a -1 value being set here,
+ * so this is always either -1L or a syscall number.
+ */
+ return regs->orig_ax;
+}
+
+/*
+ * Return a value that is -EFOO if the system call in @regs->orig_ax
+ * returned an error. This only works for @regs from @current.
+ */
+static long current_syscall_ret(struct pt_regs *regs)
+{
+#ifdef CONFIG_IA32_EMULATION
+ if (test_thread_flag(TIF_IA32))
+ /*
+ * Sign-extend the value so (int)-EFOO becomes (long)-EFOO
+ * and will match correctly in comparisons.
+ */
+ return (int) regs->ax;
+#endif
+ return regs->ax;
+}
+
/*
* OK, we're invoking a handler
*/
static int
handle_signal(unsigned long sig, siginfo_t *info, struct k_sigaction *ka,
- sigset_t *oldset, struct pt_regs *regs)
+ sigset_t *oldset, struct pt_regs *regs)
{
int ret;
#ifdef DEBUG_SIG
- printk("handle_signal pid:%d sig:%lu rip:%lx rsp:%lx regs=%p\n",
+ printk("handle_signal pid:%d sig:%lu ip:%lx sp:%lx regs=%p\n",
current->pid, sig,
- regs->rip, regs->rsp, regs);
+ regs->ip, regs->sp, regs);
#endif
/* Are we from a system call? */
- if ((long)regs->orig_rax >= 0) {
+ if (current_syscall(regs) >= 0) {
/* If so, check system call restarting.. */
- switch (regs->rax) {
- case -ERESTART_RESTARTBLOCK:
- case -ERESTARTNOHAND:
- regs->rax = -EINTR;
- break;
+ switch (current_syscall_ret(regs)) {
+ case -ERESTART_RESTARTBLOCK:
+ case -ERESTARTNOHAND:
+ regs->ax = -EINTR;
+ break;
- case -ERESTARTSYS:
- if (!(ka->sa.sa_flags & SA_RESTART)) {
- regs->rax = -EINTR;
- break;
- }
- /* fallthrough */
- case -ERESTARTNOINTR:
- regs->rax = regs->orig_rax;
- regs->rip -= 2;
+ 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 (PT_DTRACE), clear the TF
- * flag so that register information in the sigcontext is
- * correct.
+ * 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->eflags & TF_MASK)) {
- if (likely(current->ptrace & PT_DTRACE)) {
- current->ptrace &= ~PT_DTRACE;
- regs->eflags &= ~TF_MASK;
- }
- }
+ if (unlikely(regs->flags & X86_EFLAGS_TF) &&
+ likely(test_and_clear_thread_flag(TIF_FORCED_TF)))
+ regs->flags &= ~X86_EFLAGS_TF;
#ifdef CONFIG_IA32_EMULATION
if (test_thread_flag(TIF_IA32)) {
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
+ * 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;
signr = get_signal_to_deliver(&info, &ka, regs, NULL);
if (signr > 0) {
- /* Reenable any watchpoints before delivering the
+ /* 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.
}
/* Did we come from a system call? */
- if ((long)regs->orig_rax >= 0) {
+ if (current_syscall(regs) >= 0) {
/* Restart the system call - no handlers present */
- long res = regs->rax;
- switch (res) {
+ switch (current_syscall_ret(regs)) {
case -ERESTARTNOHAND:
case -ERESTARTSYS:
case -ERESTARTNOINTR:
- regs->rax = regs->orig_rax;
- regs->rip -= 2;
+ regs->ax = regs->orig_ax;
+ regs->ip -= 2;
break;
case -ERESTART_RESTARTBLOCK:
- regs->rax = test_thread_flag(TIF_IA32) ?
+ regs->ax = test_thread_flag(TIF_IA32) ?
__NR_ia32_restart_syscall :
__NR_restart_syscall;
- regs->rip -= 2;
+ regs->ip -= 2;
break;
}
}
- /* if there's no signal to deliver, we just put the saved sigmask
- back. */
+ /*
+ * If there's no signal to deliver, we just put the saved sigmask
+ * back.
+ */
if (test_thread_flag(TIF_RESTORE_SIGMASK)) {
clear_thread_flag(TIF_RESTORE_SIGMASK);
sigprocmask(SIG_SETMASK, ¤t->saved_sigmask, NULL);
}
}
-void
-do_notify_resume(struct pt_regs *regs, void *unused, __u32 thread_info_flags)
+void do_notify_resume(struct pt_regs *regs, void *unused,
+ __u32 thread_info_flags)
{
#ifdef DEBUG_SIG
- printk("do_notify_resume flags:%x rip:%lx rsp:%lx caller:%p pending:%x\n",
- thread_info_flags, regs->rip, regs->rsp, __builtin_return_address(0),signal_pending(current));
+ printk("do_notify_resume flags:%x ip:%lx sp:%lx caller:%p pending:%x\n",
+ thread_info_flags, regs->ip, regs->sp, __builtin_return_address(0),signal_pending(current));
#endif
/* Pending single-step? */
if (thread_info_flags & _TIF_SINGLESTEP) {
- regs->eflags |= TF_MASK;
+ regs->flags |= X86_EFLAGS_TF;
clear_thread_flag(TIF_SINGLESTEP);
}
#endif /* CONFIG_X86_MCE */
/* deal with pending signal delivery */
- if (thread_info_flags & (_TIF_SIGPENDING|_TIF_RESTORE_SIGMASK))
+ if (thread_info_flags & (_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK))
do_signal(regs);
+
+ if (thread_info_flags & _TIF_HRTICK_RESCHED)
+ hrtick_resched();
}
void signal_fault(struct pt_regs *regs, void __user *frame, char *where)
{
struct task_struct *me = current;
- if (show_unhandled_signals && printk_ratelimit())
- printk("%s[%d] bad frame in %s frame:%p rip:%lx rsp:%lx orax:%lx\n",
- me->comm,me->pid,where,frame,regs->rip,regs->rsp,regs->orig_rax);
+ if (show_unhandled_signals && printk_ratelimit()) {
+ printk("%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("\n");
+ }
force_sig(SIGSEGV, me);
}
git.samba.org / sfrench / cifs-2.6.git / blobdiff