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Subject[tip:x86/asm] x86: Merge sys_sigaltstack
Commit-ID:  052acad48a566a6dbcccb95e5d22e5e1b7cac8dd
Gitweb: http://git.kernel.org/tip/052acad48a566a6dbcccb95e5d22e5e1b7cac8dd
Author: Brian Gerst <brgerst@gmail.com>
AuthorDate: Wed, 9 Dec 2009 19:01:54 -0500
Committer: H. Peter Anvin <hpa@zytor.com>
CommitDate: Wed, 9 Dec 2009 16:28:59 -0800

x86: Merge sys_sigaltstack

Change 32-bit sys_sigaltstack to PTREGSCALL2, and merge with 64-bit.

Signed-off-by: Brian Gerst <brgerst@gmail.com>
LKML-Reference: <1260403316-5679-5-git-send-email-brgerst@gmail.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
---
arch/x86/include/asm/syscalls.h | 8 +++-----
arch/x86/kernel/entry_32.S | 2 +-
arch/x86/kernel/signal.c | 12 +-----------
3 files changed, 5 insertions(+), 17 deletions(-)
diff --git a/arch/x86/include/asm/syscalls.h b/arch/x86/include/asm/syscalls.h
index 48c48e5..94e0b61 100644
--- a/arch/x86/include/asm/syscalls.h
+++ b/arch/x86/include/asm/syscalls.h
@@ -31,6 +31,9 @@ asmlinkage int sys_modify_ldt(int, void __user *, unsigned long);

/* kernel/signal.c */
long sys_rt_sigreturn(struct pt_regs *);
+long sys_sigaltstack(const stack_t __user *, stack_t __user *,
+ struct pt_regs *);
+

/* kernel/tls.c */
asmlinkage int sys_set_thread_area(struct user_desc __user *);
@@ -46,7 +49,6 @@ int sys_clone(struct pt_regs *);
asmlinkage int sys_sigsuspend(int, int, old_sigset_t);
asmlinkage int sys_sigaction(int, const struct old_sigaction __user *,
struct old_sigaction __user *);
-int sys_sigaltstack(struct pt_regs *);
unsigned long sys_sigreturn(struct pt_regs *);

/* kernel/sys_i386_32.c */
@@ -76,10 +78,6 @@ asmlinkage long sys_clone(unsigned long, unsigned long,
struct pt_regs *);
long sys_arch_prctl(int, unsigned long);

-/* kernel/signal.c */
-asmlinkage long sys_sigaltstack(const stack_t __user *, stack_t __user *,
- struct pt_regs *);
-
/* kernel/sys_x86_64.c */
struct new_utsname;

diff --git a/arch/x86/kernel/entry_32.S b/arch/x86/kernel/entry_32.S
index a96a0d8..621ef45 100644
--- a/arch/x86/kernel/entry_32.S
+++ b/arch/x86/kernel/entry_32.S
@@ -763,7 +763,7 @@ PTREGSCALL0(fork)
PTREGSCALL0(clone)
PTREGSCALL0(vfork)
PTREGSCALL3(execve)
-PTREGSCALL0(sigaltstack)
+PTREGSCALL2(sigaltstack)
PTREGSCALL0(sigreturn)
PTREGSCALL0(rt_sigreturn)
PTREGSCALL0(vm86)
diff --git a/arch/x86/kernel/signal.c b/arch/x86/kernel/signal.c
index 74fe6d8..4fd173c 100644
--- a/arch/x86/kernel/signal.c
+++ b/arch/x86/kernel/signal.c
@@ -545,22 +545,12 @@ sys_sigaction(int sig, const struct old_sigaction __user *act,
}
#endif /* CONFIG_X86_32 */

-#ifdef CONFIG_X86_32
-int sys_sigaltstack(struct pt_regs *regs)
-{
- const stack_t __user *uss = (const stack_t __user *)regs->bx;
- stack_t __user *uoss = (stack_t __user *)regs->cx;
-
- return do_sigaltstack(uss, uoss, regs->sp);
-}
-#else /* !CONFIG_X86_32 */
-asmlinkage long
+long
sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss,
struct pt_regs *regs)
{
return do_sigaltstack(uss, uoss, regs->sp);
}
-#endif /* CONFIG_X86_32 */

/*
* Do a signal return; undo the signal stack.

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