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| author | Brian Gerst <brgerst@gmail.com> | 2009-02-10 17:51:46 +0300 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-02-11 14:40:45 +0300 |
| commit | 253f29a4ae9cc6cdc7b94f96517f27a93885a6ce (patch) | |
| tree | 09942e565938a6bac216b1725ccf607e01d09b20 /arch/x86/kernel/signal.c | |
| parent | aa78bcfa01dec3cdbde3cda098ce32abbd9c3bf6 (diff) | |
| download | linux-253f29a4ae9cc6cdc7b94f96517f27a93885a6ce.tar.xz | |
x86: pass in pt_regs pointer for syscalls that need it
Some syscalls need to access the pt_regs structure, either to copy
user register state or to modifiy it. This patch adds stubs to load
the address of the pt_regs struct into the %eax register, and changes
the syscalls to regparm(1) to receive the pt_regs pointer as the
first argument.
Signed-off-by: Brian Gerst <brgerst@gmail.com>
Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/kernel/signal.c')
| -rw-r--r-- | arch/x86/kernel/signal.c | 35 |
1 files changed, 7 insertions, 28 deletions
diff --git a/arch/x86/kernel/signal.c b/arch/x86/kernel/signal.c index 8562387c75a7..d7a158367e38 100644 --- a/arch/x86/kernel/signal.c +++ b/arch/x86/kernel/signal.c @@ -549,39 +549,28 @@ sys_sigaction(int sig, const struct old_sigaction __user *act, #endif /* CONFIG_X86_32 */ #ifdef CONFIG_X86_32 -asmlinkage int sys_sigaltstack(unsigned long bx) -{ - /* - * This is needed to make gcc realize it doesn't own the - * "struct pt_regs" - */ - struct pt_regs *regs = (struct pt_regs *)&bx; - const stack_t __user *uss = (const stack_t __user *)bx; - stack_t __user *uoss = (stack_t __user *)regs->cx; - - return do_sigaltstack(uss, uoss, regs->sp); -} +ptregscall int +sys_sigaltstack(struct pt_regs *regs, const stack_t __user *uss, + stack_t __user *uoss) #else /* !CONFIG_X86_32 */ asmlinkage long sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss, struct pt_regs *regs) +#endif /* CONFIG_X86_32 */ { return do_sigaltstack(uss, uoss, regs->sp); } -#endif /* CONFIG_X86_32 */ /* * Do a signal return; undo the signal stack. */ #ifdef CONFIG_X86_32 -asmlinkage unsigned long sys_sigreturn(unsigned long __unused) +ptregscall unsigned long sys_sigreturn(struct pt_regs *regs) { 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))) @@ -640,23 +629,13 @@ badframe: } #ifdef CONFIG_X86_32 -/* - * Note: do not pass in pt_regs directly as with tail-call optimization - * GCC will incorrectly stomp on the caller's frame and corrupt user-space - * register state: - */ -asmlinkage int sys_rt_sigreturn(unsigned long __unused) -{ - struct pt_regs *regs = (struct pt_regs *)&__unused; - - return do_rt_sigreturn(regs); -} +ptregscall int sys_rt_sigreturn(struct pt_regs *regs) #else /* !CONFIG_X86_32 */ asmlinkage long sys_rt_sigreturn(struct pt_regs *regs) +#endif /* CONFIG_X86_32 */ { return do_rt_sigreturn(regs); } -#endif /* CONFIG_X86_32 */ /* * OK, we're invoking a handler: |