diff options
Diffstat (limited to 'arch/x86/ia32/ia32_signal.c')
| -rw-r--r-- | arch/x86/ia32/ia32_signal.c | 24 |
1 files changed, 16 insertions, 8 deletions
diff --git a/arch/x86/ia32/ia32_signal.c b/arch/x86/ia32/ia32_signal.c index 20af4c79579a..a05bf0fb7415 100644 --- a/arch/x86/ia32/ia32_signal.c +++ b/arch/x86/ia32/ia32_signal.c @@ -179,9 +179,10 @@ struct sigframe u32 pretcode; int sig; struct sigcontext_ia32 sc; - struct _fpstate_ia32 fpstate; + struct _fpstate_ia32 fpstate_unused; /* look at kernel/sigframe.h */ unsigned int extramask[_COMPAT_NSIG_WORDS-1]; char retcode[8]; + /* fp state follows here */ }; struct rt_sigframe @@ -192,8 +193,8 @@ struct rt_sigframe u32 puc; compat_siginfo_t info; struct ucontext_ia32 uc; - struct _fpstate_ia32 fpstate; char retcode[8]; + /* fp state follows here */ }; #define COPY(x) { \ @@ -402,7 +403,8 @@ static int ia32_setup_sigcontext(struct sigcontext_ia32 __user *sc, * Determine which stack to use.. */ static void __user *get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, - size_t frame_size) + size_t frame_size, + struct _fpstate_ia32 **fpstate) { unsigned long sp; @@ -421,6 +423,11 @@ static void __user *get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, ka->sa.sa_restorer) sp = (unsigned long) ka->sa.sa_restorer; + if (used_math()) { + sp = sp - sig_xstate_ia32_size; + *fpstate = (struct _fpstate_ia32 *) sp; + } + sp -= frame_size; /* Align the stack pointer according to the i386 ABI, * i.e. so that on function entry ((sp + 4) & 15) == 0. */ @@ -434,6 +441,7 @@ int ia32_setup_frame(int sig, struct k_sigaction *ka, struct sigframe __user *frame; void __user *restorer; int err = 0; + struct _fpstate_ia32 __user *fpstate = NULL; /* copy_to_user optimizes that into a single 8 byte store */ static const struct { @@ -448,7 +456,7 @@ int ia32_setup_frame(int sig, struct k_sigaction *ka, 0, }; - frame = get_sigframe(ka, regs, sizeof(*frame)); + frame = get_sigframe(ka, regs, sizeof(*frame), &fpstate); if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) goto give_sigsegv; @@ -457,8 +465,7 @@ int ia32_setup_frame(int sig, struct k_sigaction *ka, if (err) goto give_sigsegv; - err |= ia32_setup_sigcontext(&frame->sc, &frame->fpstate, regs, - set->sig[0]); + err |= ia32_setup_sigcontext(&frame->sc, fpstate, regs, set->sig[0]); if (err) goto give_sigsegv; @@ -522,6 +529,7 @@ int ia32_setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info, struct rt_sigframe __user *frame; void __user *restorer; int err = 0; + struct _fpstate_ia32 __user *fpstate = NULL; /* __copy_to_user optimizes that into a single 8 byte store */ static const struct { @@ -537,7 +545,7 @@ int ia32_setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info, 0, }; - frame = get_sigframe(ka, regs, sizeof(*frame)); + frame = get_sigframe(ka, regs, sizeof(*frame), &fpstate); if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) goto give_sigsegv; @@ -556,7 +564,7 @@ int ia32_setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info, err |= __put_user(sas_ss_flags(regs->sp), &frame->uc.uc_stack.ss_flags); err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size); - err |= ia32_setup_sigcontext(&frame->uc.uc_mcontext, &frame->fpstate, + err |= ia32_setup_sigcontext(&frame->uc.uc_mcontext, fpstate, regs, set->sig[0]); err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set)); if (err) |