[PATCH] m32r: fix and update for gcc-4.0

Fix and update for gcc-4.0.

- arch/m32r/kernel/signal.c:
  Change type of the 8th parameter of sys_rt_sigsuspend() from
  'struct pt_regs' to 'struct pt_regs *'.
  This functions make use of the 'regs' parameter to return status value,
  but gcc-4.0 optimizes and removes it as a dead code.
  Functions, sys_sigaltstack() and sys_rt_sigreturn(), have also modified.

- arch/m32r/lib/usercopy.c, include/asm-m32r/uaccess.h:
  Add early-clobber constraints('&') to output values of asm statements;
  these constraints seems to be required for gcc-4.0 register assignment.

Signed-off-by: Hayato Fujiwara <fujiwara@linux-m32r.org>
Signed-off-by: Hirokazu Takata <takata@linux-m32r.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 10 insertions, 14 deletions

diff --git a/arch/m32r/kernel/signal.c b/arch/m32r/kernel/signal.c
index 71763f7a1d19..cb33097fefc4 100644
--- a/arch/m32r/kernel/signal.c
+++ b/arch/m32r/kernel/signal.c
@@ -36,7 +36,7 @@ int do_signal(struct pt_regs *, sigset_t *);
 asmlinkage int
 sys_rt_sigsuspend(sigset_t *unewset, size_t sigsetsize,
                   unsigned long r2, unsigned long r3, unsigned long r4,
-                  unsigned long r5, unsigned long r6, struct pt_regs regs)
+                  unsigned long r5, unsigned long r6, struct pt_regs *regs)
 {
         sigset_t saveset, newset;
 
@@ -54,21 +54,21 @@ sys_rt_sigsuspend(sigset_t *unewset, size_t sigsetsize,
         recalc_sigpending();
         spin_unlock_irq(&current->sighand->siglock);
 
-        regs.r0 = -EINTR;
+        regs->r0 = -EINTR;
         while (1) {
                 current->state = TASK_INTERRUPTIBLE;
                 schedule();
-                if (do_signal(&regs, &saveset))
-                        return regs.r0;
+                if (do_signal(regs, &saveset))
+                        return regs->r0;
         }
 }
 
 asmlinkage int
 sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss,
                 unsigned long r2, unsigned long r3, unsigned long r4,
-                unsigned long r5, unsigned long r6, struct pt_regs regs)
+                unsigned long r5, unsigned long r6, struct pt_regs *regs)
 {
-        return do_sigaltstack(uss, uoss, regs.spu);
+        return do_sigaltstack(uss, uoss, regs->spu);
 }
 
 
@@ -140,11 +140,10 @@ restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc,
 asmlinkage int
 sys_rt_sigreturn(unsigned long r0, unsigned long r1,
                  unsigned long r2, unsigned long r3, unsigned long r4,
-                 unsigned long r5, unsigned long r6, struct pt_regs regs)
+                 unsigned long r5, unsigned long r6, struct pt_regs *regs)
 {
-        struct rt_sigframe __user *frame = (struct rt_sigframe __user *)regs.spu;
+        struct rt_sigframe __user *frame = (struct rt_sigframe __user *)regs->spu;
         sigset_t set;
-        stack_t st;
         int result;
 
         if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
@@ -158,14 +157,11 @@ sys_rt_sigreturn(unsigned long r0, unsigned long r1,
         recalc_sigpending();
         spin_unlock_irq(&current->sighand->siglock);
 
-        if (restore_sigcontext(&regs, &frame->uc.uc_mcontext, &result))
+        if (restore_sigcontext(regs, &frame->uc.uc_mcontext, &result))
                 goto badframe;
 
-        if (__copy_from_user(&st, &frame->uc.uc_stack, sizeof(st)))
+        if (do_sigaltstack(&frame->uc.uc_stack, NULL, regs->spu) == -EFAULT)
                 goto badframe;
-        /* It is more difficult to avoid calling this function than to
-           call it and ignore errors.  */
-        do_sigaltstack(&st, NULL, regs.spu);
 
         return result;