x86: signal: unify signal_{32|64}.c, prepare

Impact: cleanup

Add #ifdef directive for 32-bit only code.

Signed-off-by: Hiroshi Shimamoto <h-shimamoto@ct.jp.nec.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 115 insertions, 1 deletions

diff --git a/arch/x86/kernel/signal_64.c b/arch/x86/kernel/signal_64.c
index 2da7e6e60807..b1f4d34e0a38 100644
--- a/arch/x86/kernel/signal_64.c
+++ b/arch/x86/kernel/signal_64.c
@@ -54,12 +54,24 @@
         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)
@@ -472,6 +484,63 @@ static int __setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
 #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(&current->sighand->siglock);
+        current->saved_sigmask = current->blocked;
+        siginitset(&current->blocked, mask);
+        recalc_sigpending();
+        spin_unlock_irq(&current->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)
 {
         /*
@@ -496,6 +565,51 @@ sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss,
 /*
  * 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(&current->sighand->siglock);
+        current->blocked = set;
+        recalc_sigpending();
+        spin_unlock_irq(&current->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;
@@ -542,7 +656,7 @@ asmlinkage long sys_rt_sigreturn(struct pt_regs *regs)
 #endif /* CONFIG_X86_32 */
 
 /*
- * OK, we're invoking a handler
+ * OK, we're invoking a handler:
  */
 static int signr_convert(int sig)
 {