fedora core 6 1.2949 + vserver 2.2.0

[linux-2.6.git] / arch / i386 / kernel / signal.c

diff --git a/arch/i386/kernel/signal.c b/arch/i386/kernel/signal.c
index 963616d..13755e1 100644 (file)
--- a/arch/i386/kernel/signal.c
+++ b/arch/i386/kernel/signal.c
@@ -19,8 +19,9 @@
 #include <linux/stddef.h>
 #include <linux/personality.h>
 #include <linux/suspend.h>
-#include <linux/ptrace.h>
+#include <linux/tracehook.h>
 #include <linux/elf.h>
+#include <linux/binfmts.h>
 #include <asm/processor.h>
 #include <asm/ucontext.h>
 #include <asm/uaccess.h>
@@ -123,11 +124,12 @@ restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc, int *peax
          err |= __get_user(tmp, &sc->seg);                             \
          loadsegment(seg,tmp); }
 
-#define        FIX_EFLAGS      (X86_EFLAGS_AC | X86_EFLAGS_OF | X86_EFLAGS_DF | \
+#define        FIX_EFLAGS      (X86_EFLAGS_AC | X86_EFLAGS_RF |                 \
+                        X86_EFLAGS_OF | X86_EFLAGS_DF |                 \
                         X86_EFLAGS_TF | X86_EFLAGS_SF | X86_EFLAGS_ZF | \
                         X86_EFLAGS_AF | X86_EFLAGS_PF | X86_EFLAGS_CF)
 
-       GET_SEG(gs);
+       COPY_SEG(gs);
        GET_SEG(fs);
        COPY_SEG(es);
        COPY_SEG(ds);
@@ -243,9 +245,7 @@ setup_sigcontext(struct sigcontext __user *sc, struct _fpstate __user *fpstate,
 {
        int tmp, err = 0;
 
-       tmp = 0;
-       savesegment(gs, tmp);
-       err |= __put_user(tmp, (unsigned int __user *)&sc->gs);
+       err |= __put_user(regs->xgs, (unsigned int __user *)&sc->gs);
        savesegment(fs, tmp);
        err |= __put_user(tmp, (unsigned int __user *)&sc->fs);
 
@@ -350,7 +350,10 @@ static int setup_frame(int sig, struct k_sigaction *ka,
                        goto give_sigsegv;
        }
 
-       restorer = &__kernel_sigreturn;
+       if (current->binfmt->hasvdso)
+               restorer = (void *)VDSO_SYM(&__kernel_sigreturn);
+       else
+               restorer = (void *)&frame->retcode;
        if (ka->sa.sa_flags & SA_RESTORER)
                restorer = ka->sa.sa_restorer;
 
@@ -384,16 +387,6 @@ static int setup_frame(int sig, struct k_sigaction *ka,
        regs->xss = __USER_DS;
        regs->xcs = __USER_CS;
 
-       /*
-        * 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->eflags &= ~TF_MASK;
-       if (test_thread_flag(TIF_SINGLESTEP))
-               ptrace_notify(SIGTRAP);
-
 #if DEBUG_SIG
        printk("SIG deliver (%s:%d): sp=%p pc=%p ra=%p\n",
                current->comm, current->pid, frame, regs->eip, frame->pretcode);
@@ -446,7 +439,7 @@ static int setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
                goto give_sigsegv;
 
        /* Set up to return from userspace.  */
-       restorer = &__kernel_rt_sigreturn;
+       restorer = (void *)VDSO_SYM(&__kernel_rt_sigreturn);
        if (ka->sa.sa_flags & SA_RESTORER)
                restorer = ka->sa.sa_restorer;
        err |= __put_user(restorer, &frame->pretcode);
@@ -478,16 +471,6 @@ static int setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
        regs->xss = __USER_DS;
        regs->xcs = __USER_CS;
 
-       /*
-        * 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->eflags &= ~TF_MASK;
-       if (test_thread_flag(TIF_SINGLESTEP))
-               ptrace_notify(SIGTRAP);
-
 #if DEBUG_SIG
        printk("SIG deliver (%s:%d): sp=%p pc=%p ra=%p\n",
                current->comm, current->pid, frame, regs->eip, frame->pretcode);
@@ -532,14 +515,12 @@ handle_signal(unsigned long sig, siginfo_t *info, struct k_sigaction *ka,
        }
 
        /*
-        * If TF is set due to a debugger (PT_DTRACE), clear the TF flag so
+        * 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)
-           && likely(current->ptrace & PT_DTRACE)) {
-               current->ptrace &= ~PT_DTRACE;
+           && likely(test_and_clear_thread_flag(TIF_FORCED_TF)))
                regs->eflags &= ~TF_MASK;
-       }
 
        /* Set up the stack frame */
        if (ka->sa.sa_flags & SA_SIGINFO)
@@ -554,6 +535,15 @@ handle_signal(unsigned long sig, siginfo_t *info, struct k_sigaction *ka,
                        sigaddset(&current->blocked,sig);
                recalc_sigpending();
                spin_unlock_irq(&current->sighand->siglock);
+
+               /*
+                * 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->eflags &= ~TF_MASK;
+               tracehook_report_handle_signal(sig, ka, oldset, regs);
        }
 
        return ret;
@@ -582,9 +572,6 @@ static void fastcall do_signal(struct pt_regs *regs)
        if (!user_mode(regs))
                return;
 
-       if (try_to_freeze())
-               goto no_signal;
-
        if (test_thread_flag(TIF_RESTORE_SIGMASK))
                oldset = &current->saved_sigmask;
        else
@@ -613,7 +600,6 @@ static void fastcall do_signal(struct pt_regs *regs)
                return;
        }
 
-no_signal:
        /* Did we come from a system call? */
        if (regs->orig_eax >= 0) {
                /* Restart the system call - no handlers present */