From 97286a2b64725aac2d584ddd1f94871f9991d5a1 Mon Sep 17 00:00:00 2001 From: Hiroshi Shimamoto Date: Fri, 27 Feb 2009 10:28:48 -0800 Subject: x86: signal: intrroduce get_sigframe() and replace get_sigstack() Impact: cleanup Introduce get_sigframe() like 32-bit to replace get_sigstack(). Move the i387 stuff into get_sigframe(). Signed-off-by: Hiroshi Shimamoto Signed-off-by: Ingo Molnar --- arch/x86/kernel/signal.c | 32 +++++++++++++++++++------------- 1 file changed, 19 insertions(+), 13 deletions(-) (limited to 'arch') diff --git a/arch/x86/kernel/signal.c b/arch/x86/kernel/signal.c index e89eaf417e55..82d37c77b0fb 100644 --- a/arch/x86/kernel/signal.c +++ b/arch/x86/kernel/signal.c @@ -392,10 +392,13 @@ static int __setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info, * Determine which stack to use.. */ static void __user * -get_stack(struct k_sigaction *ka, unsigned long sp, unsigned long size) +get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, size_t frame_size, + void __user **fpstate) { - /* Default to using normal stack - redzone*/ - sp -= 128; + unsigned long sp; + + /* Default to using normal stack - redzone */ + sp = regs->sp - 128; /* This is the X/Open sanctioned signal stack switching. */ if (ka->sa.sa_flags & SA_ONSTACK) { @@ -403,7 +406,18 @@ get_stack(struct k_sigaction *ka, unsigned long sp, unsigned long size) sp = current->sas_ss_sp + current->sas_ss_size; } - return (void __user *)round_down(sp - size, 64); + if (used_math()) { + sp -= sig_xstate_size; + *fpstate = (void __user *)round_down(sp, 64); + if (save_i387_xstate(*fpstate) < 0) + return (void __user *) -1L; + + sp -= frame_size; + return (void __user *)round_down(sp, 16) - 8; + } + + sp -= frame_size; + return (void __user *)round_down(sp, 64) - 8; } static int __setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info, @@ -414,15 +428,7 @@ static int __setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info, int err = 0; struct task_struct *me = current; - if (used_math()) { - fp = get_stack(ka, regs->sp, sig_xstate_size); - frame = (void __user *)round_down( - (unsigned long)fp - sizeof(struct rt_sigframe), 16) - 8; - - if (save_i387_xstate(fp) < 0) - return -EFAULT; - } else - frame = get_stack(ka, regs->sp, sizeof(struct rt_sigframe)) - 8; + frame = get_sigframe(ka, regs, sizeof(struct rt_sigframe), &fp); if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) return -EFAULT; -- cgit v1.2.2