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authorAl Viro <viro@zeniv.linux.org.uk>2012-11-09 23:51:47 -0500
committerAl Viro <viro@zeniv.linux.org.uk>2013-02-14 09:21:17 -0500
commit235b80226b986dabcbba844968f7807866bd0bfe (patch)
tree834a02573bcb1986c0b5e73af8fc8bd7d16dbffb
parent08f739570de697dc06b949ba3be33acdda21498c (diff)
downloadlinux-sh-235b80226b986dabcbba844968f7807866bd0bfe.tar.gz
x86: convert to ksignal
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
-rw-r--r--arch/x86/ia32/ia32_signal.c37
-rw-r--r--arch/x86/include/asm/fpu-internal.h5
-rw-r--r--arch/x86/kernel/signal.c117
3 files changed, 74 insertions, 85 deletions
diff --git a/arch/x86/ia32/ia32_signal.c b/arch/x86/ia32/ia32_signal.c
index b0460cd7de5a..cf1a471a18a2 100644
--- a/arch/x86/ia32/ia32_signal.c
+++ b/arch/x86/ia32/ia32_signal.c
@@ -309,7 +309,7 @@ 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,
+static void __user *get_sigframe(struct ksignal *ksig, struct pt_regs *regs,
size_t frame_size,
void __user **fpstate)
{
@@ -319,16 +319,13 @@ static void __user *get_sigframe(struct k_sigaction *ka, struct pt_regs *regs,
sp = regs->sp;
/* This is the X/Open sanctioned signal stack switching. */
- if (ka->sa.sa_flags & SA_ONSTACK) {
- if (sas_ss_flags(sp) == 0)
- sp = current->sas_ss_sp + current->sas_ss_size;
- }
-
+ if (ksig->ka.sa.sa_flags & SA_ONSTACK)
+ sp = sigsp(sp, ksig);
/* This is the legacy signal stack switching. */
else if ((regs->ss & 0xffff) != __USER32_DS &&
- !(ka->sa.sa_flags & SA_RESTORER) &&
- ka->sa.sa_restorer)
- sp = (unsigned long) ka->sa.sa_restorer;
+ !(ksig->ka.sa.sa_flags & SA_RESTORER) &&
+ ksig->ka.sa.sa_restorer)
+ sp = (unsigned long) ksig->ka.sa.sa_restorer;
if (used_math()) {
unsigned long fx_aligned, math_size;
@@ -347,7 +344,7 @@ static void __user *get_sigframe(struct k_sigaction *ka, struct pt_regs *regs,
return (void __user *) sp;
}
-int ia32_setup_frame(int sig, struct k_sigaction *ka,
+int ia32_setup_frame(int sig, struct ksignal *ksig,
compat_sigset_t *set, struct pt_regs *regs)
{
struct sigframe_ia32 __user *frame;
@@ -366,7 +363,7 @@ int ia32_setup_frame(int sig, struct k_sigaction *ka,
0x80cd, /* int $0x80 */
};
- frame = get_sigframe(ka, regs, sizeof(*frame), &fpstate);
+ frame = get_sigframe(ksig, regs, sizeof(*frame), &fpstate);
if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
return -EFAULT;
@@ -383,8 +380,8 @@ int ia32_setup_frame(int sig, struct k_sigaction *ka,
return -EFAULT;
}
- if (ka->sa.sa_flags & SA_RESTORER) {
- restorer = ka->sa.sa_restorer;
+ if (ksig->ka.sa.sa_flags & SA_RESTORER) {
+ restorer = ksig->ka.sa.sa_restorer;
} else {
/* Return stub is in 32bit vsyscall page */
if (current->mm->context.vdso)
@@ -409,7 +406,7 @@ int ia32_setup_frame(int sig, struct k_sigaction *ka,
/* Set up registers for signal handler */
regs->sp = (unsigned long) frame;
- regs->ip = (unsigned long) ka->sa.sa_handler;
+ regs->ip = (unsigned long) ksig->ka.sa.sa_handler;
/* Make -mregparm=3 work */
regs->ax = sig;
@@ -425,7 +422,7 @@ int ia32_setup_frame(int sig, struct k_sigaction *ka,
return 0;
}
-int ia32_setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
+int ia32_setup_rt_frame(int sig, struct ksignal *ksig,
compat_sigset_t *set, struct pt_regs *regs)
{
struct rt_sigframe_ia32 __user *frame;
@@ -446,7 +443,7 @@ int ia32_setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
0,
};
- frame = get_sigframe(ka, regs, sizeof(*frame), &fpstate);
+ frame = get_sigframe(ksig, regs, sizeof(*frame), &fpstate);
if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
return -EFAULT;
@@ -464,8 +461,8 @@ int ia32_setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
put_user_ex(0, &frame->uc.uc_link);
err |= __compat_save_altstack(&frame->uc.uc_stack, regs->sp);
- if (ka->sa.sa_flags & SA_RESTORER)
- restorer = ka->sa.sa_restorer;
+ if (ksig->ka.sa.sa_flags & SA_RESTORER)
+ restorer = ksig->ka.sa.sa_restorer;
else
restorer = VDSO32_SYMBOL(current->mm->context.vdso,
rt_sigreturn);
@@ -478,7 +475,7 @@ int ia32_setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
put_user_ex(*((u64 *)&code), (u64 __user *)frame->retcode);
} put_user_catch(err);
- err |= copy_siginfo_to_user32(&frame->info, info);
+ err |= copy_siginfo_to_user32(&frame->info, &ksig->info);
err |= ia32_setup_sigcontext(&frame->uc.uc_mcontext, fpstate,
regs, set->sig[0]);
err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
@@ -488,7 +485,7 @@ int ia32_setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
/* Set up registers for signal handler */
regs->sp = (unsigned long) frame;
- regs->ip = (unsigned long) ka->sa.sa_handler;
+ regs->ip = (unsigned long) ksig->ka.sa.sa_handler;
/* Make -mregparm=3 work */
regs->ax = sig;
diff --git a/arch/x86/include/asm/fpu-internal.h b/arch/x86/include/asm/fpu-internal.h
index 41ab26ea6564..e25cc33ec54d 100644
--- a/arch/x86/include/asm/fpu-internal.h
+++ b/arch/x86/include/asm/fpu-internal.h
@@ -26,9 +26,10 @@
#ifdef CONFIG_X86_64
# include <asm/sigcontext32.h>
# include <asm/user32.h>
-int ia32_setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
+struct ksignal;
+int ia32_setup_rt_frame(int sig, struct ksignal *ksig,
compat_sigset_t *set, struct pt_regs *regs);
-int ia32_setup_frame(int sig, struct k_sigaction *ka,
+int ia32_setup_frame(int sig, struct ksignal *ksig,
compat_sigset_t *set, struct pt_regs *regs);
#else
# define user_i387_ia32_struct user_i387_struct
diff --git a/arch/x86/kernel/signal.c b/arch/x86/kernel/signal.c
index d5b1f8a912ff..69562992e457 100644
--- a/arch/x86/kernel/signal.c
+++ b/arch/x86/kernel/signal.c
@@ -278,7 +278,7 @@ static const struct {
};
static int
-__setup_frame(int sig, struct k_sigaction *ka, sigset_t *set,
+__setup_frame(int sig, struct ksignal *ksig, sigset_t *set,
struct pt_regs *regs)
{
struct sigframe __user *frame;
@@ -286,7 +286,7 @@ __setup_frame(int sig, struct k_sigaction *ka, sigset_t *set,
int err = 0;
void __user *fpstate = NULL;
- frame = get_sigframe(ka, regs, sizeof(*frame), &fpstate);
+ frame = get_sigframe(&ksig->ka, regs, sizeof(*frame), &fpstate);
if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
return -EFAULT;
@@ -307,8 +307,8 @@ __setup_frame(int sig, struct k_sigaction *ka, sigset_t *set,
restorer = VDSO32_SYMBOL(current->mm->context.vdso, sigreturn);
else
restorer = &frame->retcode;
- if (ka->sa.sa_flags & SA_RESTORER)
- restorer = ka->sa.sa_restorer;
+ if (ksig->ka.sa.sa_flags & SA_RESTORER)
+ restorer = ksig->ka.sa.sa_restorer;
/* Set up to return from userspace. */
err |= __put_user(restorer, &frame->pretcode);
@@ -327,7 +327,7 @@ __setup_frame(int sig, struct k_sigaction *ka, sigset_t *set,
/* Set up registers for signal handler */
regs->sp = (unsigned long)frame;
- regs->ip = (unsigned long)ka->sa.sa_handler;
+ regs->ip = (unsigned long)ksig->ka.sa.sa_handler;
regs->ax = (unsigned long)sig;
regs->dx = 0;
regs->cx = 0;
@@ -340,7 +340,7 @@ __setup_frame(int sig, struct k_sigaction *ka, sigset_t *set,
return 0;
}
-static int __setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
+static int __setup_rt_frame(int sig, struct ksignal *ksig,
sigset_t *set, struct pt_regs *regs)
{
struct rt_sigframe __user *frame;
@@ -348,7 +348,7 @@ static int __setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
int err = 0;
void __user *fpstate = NULL;
- frame = get_sigframe(ka, regs, sizeof(*frame), &fpstate);
+ frame = get_sigframe(&ksig->ka, regs, sizeof(*frame), &fpstate);
if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
return -EFAULT;
@@ -368,8 +368,8 @@ static int __setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
/* Set up to return from userspace. */
restorer = VDSO32_SYMBOL(current->mm->context.vdso, rt_sigreturn);
- if (ka->sa.sa_flags & SA_RESTORER)
- restorer = ka->sa.sa_restorer;
+ if (ksig->ka.sa.sa_flags & SA_RESTORER)
+ restorer = ksig->ka.sa.sa_restorer;
put_user_ex(restorer, &frame->pretcode);
/*
@@ -382,7 +382,7 @@ static int __setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
put_user_ex(*((u64 *)&rt_retcode), (u64 *)frame->retcode);
} put_user_catch(err);
- err |= copy_siginfo_to_user(&frame->info, info);
+ err |= copy_siginfo_to_user(&frame->info, &ksig->info);
err |= setup_sigcontext(&frame->uc.uc_mcontext, fpstate,
regs, set->sig[0]);
err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
@@ -392,7 +392,7 @@ static int __setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
/* Set up registers for signal handler */
regs->sp = (unsigned long)frame;
- regs->ip = (unsigned long)ka->sa.sa_handler;
+ regs->ip = (unsigned long)ksig->ka.sa.sa_handler;
regs->ax = (unsigned long)sig;
regs->dx = (unsigned long)&frame->info;
regs->cx = (unsigned long)&frame->uc;
@@ -405,20 +405,20 @@ static int __setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
return 0;
}
#else /* !CONFIG_X86_32 */
-static int __setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
+static int __setup_rt_frame(int sig, struct ksignal *ksig,
sigset_t *set, struct pt_regs *regs)
{
struct rt_sigframe __user *frame;
void __user *fp = NULL;
int err = 0;
- frame = get_sigframe(ka, regs, sizeof(struct rt_sigframe), &fp);
+ frame = get_sigframe(&ksig->ka, regs, sizeof(struct rt_sigframe), &fp);
if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
return -EFAULT;
- if (ka->sa.sa_flags & SA_SIGINFO) {
- if (copy_siginfo_to_user(&frame->info, info))
+ if (ksig->ka.sa.sa_flags & SA_SIGINFO) {
+ if (copy_siginfo_to_user(&frame->info, &ksig->info))
return -EFAULT;
}
@@ -434,8 +434,8 @@ static int __setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
/* Set up to return from userspace. If provided, use a stub
already in userspace. */
/* x86-64 should always use SA_RESTORER. */
- if (ka->sa.sa_flags & SA_RESTORER) {
- put_user_ex(ka->sa.sa_restorer, &frame->pretcode);
+ if (ksig->ka.sa.sa_flags & SA_RESTORER) {
+ put_user_ex(ksig->ka.sa.sa_restorer, &frame->pretcode);
} else {
/* could use a vstub here */
err |= -EFAULT;
@@ -457,7 +457,7 @@ static int __setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
next argument after the signal number on the stack. */
regs->si = (unsigned long)&frame->info;
regs->dx = (unsigned long)&frame->uc;
- regs->ip = (unsigned long) ka->sa.sa_handler;
+ regs->ip = (unsigned long) ksig->ka.sa.sa_handler;
regs->sp = (unsigned long)frame;
@@ -469,8 +469,8 @@ static int __setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
}
#endif /* CONFIG_X86_32 */
-static int x32_setup_rt_frame(int sig, struct k_sigaction *ka,
- siginfo_t *info, compat_sigset_t *set,
+static int x32_setup_rt_frame(struct ksignal *ksig,
+ compat_sigset_t *set,
struct pt_regs *regs)
{
#ifdef CONFIG_X86_X32_ABI
@@ -479,13 +479,13 @@ static int x32_setup_rt_frame(int sig, struct k_sigaction *ka,
int err = 0;
void __user *fpstate = NULL;
- frame = get_sigframe(ka, regs, sizeof(*frame), &fpstate);
+ frame = get_sigframe(&ksig->ka, regs, sizeof(*frame), &fpstate);
if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
return -EFAULT;
- if (ka->sa.sa_flags & SA_SIGINFO) {
- if (copy_siginfo_to_user32(&frame->info, info))
+ if (ksig->ka.sa.sa_flags & SA_SIGINFO) {
+ if (copy_siginfo_to_user32(&frame->info, &ksig->info))
return -EFAULT;
}
@@ -499,8 +499,8 @@ static int x32_setup_rt_frame(int sig, struct k_sigaction *ka,
err |= __compat_save_altstack(&frame->uc.uc_stack, regs->sp);
put_user_ex(0, &frame->uc.uc__pad0);
- if (ka->sa.sa_flags & SA_RESTORER) {
- restorer = ka->sa.sa_restorer;
+ if (ksig->ka.sa.sa_flags & SA_RESTORER) {
+ restorer = ksig->ka.sa.sa_restorer;
} else {
/* could use a vstub here */
restorer = NULL;
@@ -518,10 +518,10 @@ static int x32_setup_rt_frame(int sig, struct k_sigaction *ka,
/* Set up registers for signal handler */
regs->sp = (unsigned long) frame;
- regs->ip = (unsigned long) ka->sa.sa_handler;
+ regs->ip = (unsigned long) ksig->ka.sa.sa_handler;
/* We use the x32 calling convention here... */
- regs->di = sig;
+ regs->di = ksig->sig;
regs->si = (unsigned long) &frame->info;
regs->dx = (unsigned long) &frame->uc;
@@ -611,30 +611,29 @@ static int signr_convert(int sig)
}
static int
-setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
- struct pt_regs *regs)
+setup_rt_frame(struct ksignal *ksig, struct pt_regs *regs)
{
- int usig = signr_convert(sig);
+ int usig = signr_convert(ksig->sig);
sigset_t *set = sigmask_to_save();
compat_sigset_t *cset = (compat_sigset_t *) set;
/* Set up the stack frame */
if (is_ia32_frame()) {
- if (ka->sa.sa_flags & SA_SIGINFO)
- return ia32_setup_rt_frame(usig, ka, info, cset, regs);
+ if (ksig->ka.sa.sa_flags & SA_SIGINFO)
+ return ia32_setup_rt_frame(usig, ksig, cset, regs);
else
- return ia32_setup_frame(usig, ka, cset, regs);
+ return ia32_setup_frame(usig, ksig, cset, regs);
} else if (is_x32_frame()) {
- return x32_setup_rt_frame(usig, ka, info, cset, regs);
+ return x32_setup_rt_frame(ksig, cset, regs);
} else {
- return __setup_rt_frame(sig, ka, info, set, regs);
+ return __setup_rt_frame(ksig->sig, ksig, set, regs);
}
}
static void
-handle_signal(unsigned long sig, siginfo_t *info, struct k_sigaction *ka,
- struct pt_regs *regs)
+handle_signal(struct ksignal *ksig, struct pt_regs *regs)
{
+ bool failed;
/* Are we from a system call? */
if (syscall_get_nr(current, regs) >= 0) {
/* If so, check system call restarting.. */
@@ -645,7 +644,7 @@ handle_signal(unsigned long sig, siginfo_t *info, struct k_sigaction *ka,
break;
case -ERESTARTSYS:
- if (!(ka->sa.sa_flags & SA_RESTART)) {
+ if (!(ksig->ka.sa.sa_flags & SA_RESTART)) {
regs->ax = -EINTR;
break;
}
@@ -665,26 +664,21 @@ handle_signal(unsigned long sig, siginfo_t *info, struct k_sigaction *ka,
likely(test_and_clear_thread_flag(TIF_FORCED_TF)))
regs->flags &= ~X86_EFLAGS_TF;
- if (setup_rt_frame(sig, ka, info, regs) < 0) {
- force_sigsegv(sig, current);
- return;
+ failed = (setup_rt_frame(ksig, regs) < 0);
+ if (!failed) {
+ /*
+ * Clear the direction flag as per the ABI for function entry.
+ */
+ regs->flags &= ~X86_EFLAGS_DF;
+ /*
+ * Clear TF when entering the signal handler, but
+ * notify any tracer that was single-stepping it.
+ * The tracer may want to single-step inside the
+ * handler too.
+ */
+ regs->flags &= ~X86_EFLAGS_TF;
}
-
- /*
- * Clear the direction flag as per the ABI for function entry.
- */
- regs->flags &= ~X86_EFLAGS_DF;
-
- /*
- * Clear TF when entering the signal handler, but
- * notify any tracer that was single-stepping it.
- * The tracer may want to single-step inside the
- * handler too.
- */
- regs->flags &= ~X86_EFLAGS_TF;
-
- signal_delivered(sig, info, ka, regs,
- test_thread_flag(TIF_SINGLESTEP));
+ signal_setup_done(failed, ksig, test_thread_flag(TIF_SINGLESTEP));
}
#ifdef CONFIG_X86_32
@@ -701,14 +695,11 @@ handle_signal(unsigned long sig, siginfo_t *info, struct k_sigaction *ka,
*/
static void do_signal(struct pt_regs *regs)
{
- struct k_sigaction ka;
- siginfo_t info;
- int signr;
+ struct ksignal ksig;
- signr = get_signal_to_deliver(&info, &ka, regs, NULL);
- if (signr > 0) {
+ if (get_signal(&ksig)) {
/* Whee! Actually deliver the signal. */
- handle_signal(signr, &info, &ka, regs);
+ handle_signal(&ksig, regs);
return;
}