[PATCH] x86_64: CPU hotplug sibling map cleanup

[linux-2.6-omap-h63xx.git] / arch / x86_64 / kernel / signal.c

diff --git a/arch/x86_64/kernel/signal.c b/arch/x86_64/kernel/signal.c
index 5ace32c6ac5c54c3add8122b940689db3a0e53af..98b7ba95d581519edb84a263d5f18f8cca8e12df 100644 (file)
--- a/arch/x86_64/kernel/signal.c
+++ b/arch/x86_64/kernel/signal.c
@@ -28,14 +28,15 @@
 #include <asm/uaccess.h>
 #include <asm/i387.h>
 #include <asm/proto.h>
+#include <asm/ia32_unistd.h>
 
 /* #define DEBUG_SIG 1 */
 
 #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
 
-void ia32_setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
+int ia32_setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
                sigset_t *set, struct pt_regs * regs); 
-void ia32_setup_frame(int sig, struct k_sigaction *ka,
+int ia32_setup_frame(int sig, struct k_sigaction *ka,
             sigset_t *set, struct pt_regs * regs); 
 
 asmlinkage long
@@ -83,7 +84,7 @@ sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss,
 
 struct rt_sigframe
 {
-       char *pretcode;
+       char __user *pretcode;
        struct ucontext uc;
        struct siginfo info;
 };
@@ -185,7 +186,6 @@ static inline int
 setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs, unsigned long mask, struct task_struct *me)
 {
        int err = 0;
-       unsigned long eflags;
 
        err |= __put_user(0, &sc->gs);
        err |= __put_user(0, &sc->fs);
@@ -209,11 +209,7 @@ setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs, unsigned lo
        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);
-       eflags = regs->eflags;
-       if (current->ptrace & PT_PTRACED) {
-               eflags &= ~TF_MASK;
-       }
-       err |= __put_user(eflags, &sc->eflags);
+       err |= __put_user(regs->eflags, &sc->eflags);
        err |= __put_user(mask, &sc->oldmask);
        err |= __put_user(me->thread.cr2, &sc->cr2);
 
@@ -242,7 +238,7 @@ get_stack(struct k_sigaction *ka, struct pt_regs *regs, unsigned long size)
        return (void __user *)round_down(rsp - size, 16); 
 }
 
-static void setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
+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;
@@ -323,33 +319,31 @@ static void setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
        regs->rsp = (unsigned long)frame;
 
        set_fs(USER_DS);
-       if (regs->eflags & TF_MASK) {
-               if ((current->ptrace & (PT_PTRACED | PT_DTRACE)) == (PT_PTRACED | PT_DTRACE)) {
-                       ptrace_notify(SIGTRAP);
-               } else {
-                       regs->eflags &= ~TF_MASK;
-               }
-       }
-
+       regs->eflags &= ~TF_MASK;
+       if (test_thread_flag(TIF_SINGLESTEP))
+               ptrace_notify(SIGTRAP);
 #ifdef 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;
+       return 1;
 
 give_sigsegv:
        force_sigsegv(sig, current);
+       return 0;
 }
 
 /*
  * OK, we're invoking a handler
  */    
 
-static void
+static int
 handle_signal(unsigned long sig, siginfo_t *info, struct k_sigaction *ka,
                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",
                current->pid, sig,
@@ -378,23 +372,37 @@ 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 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;
+               }
+       }
+
 #ifdef CONFIG_IA32_EMULATION
        if (test_thread_flag(TIF_IA32)) {
                if (ka->sa.sa_flags & SA_SIGINFO)
-                       ia32_setup_rt_frame(sig, ka, info, oldset, regs);
+                       ret = ia32_setup_rt_frame(sig, ka, info, oldset, regs);
                else
-                       ia32_setup_frame(sig, ka, oldset, regs);
+                       ret = ia32_setup_frame(sig, ka, oldset, regs);
        } else 
 #endif
-       setup_rt_frame(sig, ka, info, oldset, regs);
+       ret = setup_rt_frame(sig, ka, info, oldset, regs);
 
-       if (!(ka->sa.sa_flags & SA_NODEFER)) {
+       if (ret && !(ka->sa.sa_flags & SA_NODEFER)) {
                spin_lock_irq(&current->sighand->siglock);
                sigorsets(&current->blocked,&current->blocked,&ka->sa.sa_mask);
                sigaddset(&current->blocked,sig);
                recalc_sigpending();
                spin_unlock_irq(&current->sighand->siglock);
        }
+
+       return ret;
 }
 
 /*
@@ -414,7 +422,7 @@ int do_signal(struct pt_regs *regs, sigset_t *oldset)
         * kernel mode. Just return without doing anything
         * if so.
         */
-       if ((regs->cs & 3) != 3)
+       if (!user_mode(regs))
                return 1;
 
        if (try_to_freeze(0))
@@ -431,11 +439,10 @@ int do_signal(struct pt_regs *regs, sigset_t *oldset)
                 * inside the kernel.
                 */
                if (current->thread.debugreg7)
-                       asm volatile("movq %0,%%db7"    : : "r" (current->thread.debugreg7));
+                       set_debugreg(current->thread.debugreg7, 7);
 
                /* Whee!  Actually deliver the signal.  */
-               handle_signal(signr, &info, &ka, oldset, regs);
-               return 1;
+               return handle_signal(signr, &info, &ka, oldset, regs);
        }
 
  no_signal:
@@ -450,7 +457,9 @@ int do_signal(struct pt_regs *regs, sigset_t *oldset)
                        regs->rip -= 2;
                }
                if (regs->rax == (unsigned long)-ERESTART_RESTARTBLOCK) {
-                       regs->rax = __NR_restart_syscall;
+                       regs->rax = test_thread_flag(TIF_IA32) ?
+                                       __NR_ia32_restart_syscall :
+                                       __NR_restart_syscall;
                        regs->rip -= 2;
                }
        }