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Subject[PATCH 3.16 128/202] sh: Use get_signal() signal_setup_done()
3.16.66-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Richard Weinberger <richard@nod.at>

commit b46e848768acc458ba94feef162b8901592dbb9c upstream.

Use the more generic functions get_signal() signal_setup_done()
for signal delivery.

Signed-off-by: Richard Weinberger <richard@nod.at>
[bwh: Backported to 3.16 as dependency of commit 35634ffa1751
"signal: Always notice exiting tasks"]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
arch/sh/kernel/signal_32.c | 79 +++++++++++++++---------------------
arch/sh/kernel/signal_64.c | 82 +++++++++++++++-----------------------
2 files changed, 64 insertions(+), 97 deletions(-)

--- a/arch/sh/kernel/signal_32.c
+++ b/arch/sh/kernel/signal_32.c
@@ -262,17 +262,17 @@ get_sigframe(struct k_sigaction *ka, uns
extern void __kernel_sigreturn(void);
extern void __kernel_rt_sigreturn(void);

-static int setup_frame(int sig, struct k_sigaction *ka,
- sigset_t *set, struct pt_regs *regs)
+static int setup_frame(struct ksignal *ksig, sigset_t *set,
+ struct pt_regs *regs)
{
struct sigframe __user *frame;
- int err = 0;
+ int err = 0, sig = ksig->sig;
int signal;

- frame = get_sigframe(ka, regs->regs[15], sizeof(*frame));
+ frame = get_sigframe(&ksig->ka, regs->regs[15], sizeof(*frame));

if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
- goto give_sigsegv;
+ return -EFAULT;

signal = current_thread_info()->exec_domain
&& current_thread_info()->exec_domain->signal_invmap
@@ -288,8 +288,8 @@ static int setup_frame(int sig, struct k

/* Set up to return from userspace. If provided, use a stub
already in userspace. */
- if (ka->sa.sa_flags & SA_RESTORER) {
- regs->pr = (unsigned long) ka->sa.sa_restorer;
+ if (ksig->ka.sa.sa_flags & SA_RESTORER) {
+ regs->pr = (unsigned long) ksig->ka.sa.sa_restorer;
#ifdef CONFIG_VSYSCALL
} else if (likely(current->mm->context.vdso)) {
regs->pr = VDSO_SYM(&__kernel_sigreturn);
@@ -309,7 +309,7 @@ static int setup_frame(int sig, struct k
}

if (err)
- goto give_sigsegv;
+ return -EFAULT;

/* Set up registers for signal handler */
regs->regs[15] = (unsigned long) frame;
@@ -319,15 +319,15 @@ static int setup_frame(int sig, struct k

if (current->personality & FDPIC_FUNCPTRS) {
struct fdpic_func_descriptor __user *funcptr =
- (struct fdpic_func_descriptor __user *)ka->sa.sa_handler;
+ (struct fdpic_func_descriptor __user *)ksig->ka.sa.sa_handler;

err |= __get_user(regs->pc, &funcptr->text);
err |= __get_user(regs->regs[12], &funcptr->GOT);
} else
- regs->pc = (unsigned long)ka->sa.sa_handler;
+ regs->pc = (unsigned long)ksig->ka.sa.sa_handler;

if (err)
- goto give_sigsegv;
+ return -EFAULT;

set_fs(USER_DS);

@@ -335,23 +335,19 @@ static int setup_frame(int sig, struct k
current->comm, task_pid_nr(current), frame, regs->pc, regs->pr);

return 0;
-
-give_sigsegv:
- force_sigsegv(sig, current);
- return -EFAULT;
}

-static int setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
- sigset_t *set, struct pt_regs *regs)
+static int setup_rt_frame(struct ksignal *ksig, sigset_t *set,
+ struct pt_regs *regs)
{
struct rt_sigframe __user *frame;
- int err = 0;
+ int err = 0, sig = ksig->sig;
int signal;

- frame = get_sigframe(ka, regs->regs[15], sizeof(*frame));
+ frame = get_sigframe(&ksig->ka, regs->regs[15], sizeof(*frame));

if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
- goto give_sigsegv;
+ return -EFAULT;

signal = current_thread_info()->exec_domain
&& current_thread_info()->exec_domain->signal_invmap
@@ -359,7 +355,7 @@ static int setup_rt_frame(int sig, struc
? current_thread_info()->exec_domain->signal_invmap[sig]
: sig;

- err |= copy_siginfo_to_user(&frame->info, info);
+ err |= copy_siginfo_to_user(&frame->info, &ksig->info);

/* Create the ucontext. */
err |= __put_user(0, &frame->uc.uc_flags);
@@ -371,8 +367,8 @@ static int setup_rt_frame(int sig, struc

/* Set up to return from userspace. If provided, use a stub
already in userspace. */
- if (ka->sa.sa_flags & SA_RESTORER) {
- regs->pr = (unsigned long) ka->sa.sa_restorer;
+ if (ksig->ka.sa.sa_flags & SA_RESTORER) {
+ regs->pr = (unsigned long) ksig->ka.sa.sa_restorer;
#ifdef CONFIG_VSYSCALL
} else if (likely(current->mm->context.vdso)) {
regs->pr = VDSO_SYM(&__kernel_rt_sigreturn);
@@ -392,7 +388,7 @@ static int setup_rt_frame(int sig, struc
}

if (err)
- goto give_sigsegv;
+ return -EFAULT;

/* Set up registers for signal handler */
regs->regs[15] = (unsigned long) frame;
@@ -402,15 +398,15 @@ static int setup_rt_frame(int sig, struc

if (current->personality & FDPIC_FUNCPTRS) {
struct fdpic_func_descriptor __user *funcptr =
- (struct fdpic_func_descriptor __user *)ka->sa.sa_handler;
+ (struct fdpic_func_descriptor __user *)ksig->ka.sa.sa_handler;

err |= __get_user(regs->pc, &funcptr->text);
err |= __get_user(regs->regs[12], &funcptr->GOT);
} else
- regs->pc = (unsigned long)ka->sa.sa_handler;
+ regs->pc = (unsigned long)ksig->ka.sa.sa_handler;

if (err)
- goto give_sigsegv;
+ return -EFAULT;

set_fs(USER_DS);

@@ -418,10 +414,6 @@ static int setup_rt_frame(int sig, struc
current->comm, task_pid_nr(current), frame, regs->pc, regs->pr);

return 0;
-
-give_sigsegv:
- force_sigsegv(sig, current);
- return -EFAULT;
}

static inline void
@@ -455,22 +447,18 @@ handle_syscall_restart(unsigned long sav
* OK, we're invoking a handler
*/
static void
-handle_signal(unsigned long sig, struct k_sigaction *ka, siginfo_t *info,
- struct pt_regs *regs, unsigned int save_r0)
+handle_signal(struct ksignal *ksig, struct pt_regs *regs, unsigned int save_r0)
{
sigset_t *oldset = sigmask_to_save();
int ret;

/* Set up the stack frame */
- if (ka->sa.sa_flags & SA_SIGINFO)
- ret = setup_rt_frame(sig, ka, info, oldset, regs);
+ if (ksig->ka.sa.sa_flags & SA_SIGINFO)
+ ret = setup_rt_frame(ksig, oldset, regs);
else
- ret = setup_frame(sig, ka, oldset, regs);
+ ret = setup_frame(ksig, oldset, regs);

- if (ret)
- return;
- signal_delivered(sig, info, ka, regs,
- test_thread_flag(TIF_SINGLESTEP));
+ signal_setup_done(ret, ksig, test_thread_flag(TIF_SINGLESTEP));
}

/*
@@ -484,9 +472,7 @@ handle_signal(unsigned long sig, struct
*/
static void do_signal(struct pt_regs *regs, unsigned int save_r0)
{
- siginfo_t info;
- int signr;
- struct k_sigaction ka;
+ struct ksignal ksig;

/*
* We want the common case to go fast, which
@@ -497,12 +483,11 @@ static void do_signal(struct pt_regs *re
if (!user_mode(regs))
return;

- signr = get_signal_to_deliver(&info, &ka, regs, NULL);
- if (signr > 0) {
- handle_syscall_restart(save_r0, regs, &ka.sa);
+ if (get_signal(&ksig)) {
+ handle_syscall_restart(save_r0, regs, &ksig.ka.sa);

/* Whee! Actually deliver the signal. */
- handle_signal(signr, &ka, &info, regs, save_r0);
+ handle_signal(&ksig, regs, save_r0);
return;
}

--- a/arch/sh/kernel/signal_64.c
+++ b/arch/sh/kernel/signal_64.c
@@ -41,8 +41,7 @@
#define DEBUG_SIG 0

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);

static inline void
handle_syscall_restart(struct pt_regs *regs, struct sigaction *sa)
@@ -82,9 +81,7 @@ handle_syscall_restart(struct pt_regs *r
*/
static void do_signal(struct pt_regs *regs)
{
- siginfo_t info;
- int signr;
- struct k_sigaction ka;
+ struct ksignal ksig;

/*
* We want the common case to go fast, which
@@ -95,12 +92,11 @@ static void do_signal(struct pt_regs *re
if (!user_mode(regs))
return;

- signr = get_signal_to_deliver(&info, &ka, regs, 0);
- if (signr > 0) {
- handle_syscall_restart(regs, &ka.sa);
+ if (get_signal(&ksig)) {
+ handle_syscall_restart(regs, &ksig.ka.sa);

/* Whee! Actually deliver the signal. */
- handle_signal(signr, &info, &ka, regs);
+ handle_signal(&ksig, regs);
return;
}

@@ -378,17 +374,16 @@ get_sigframe(struct k_sigaction *ka, uns
void sa_default_restorer(void); /* See comments below */
void sa_default_rt_restorer(void); /* See comments below */

-static int setup_frame(int sig, struct k_sigaction *ka,
- sigset_t *set, struct pt_regs *regs)
+static int setup_frame(struct ksignal *ksig, sigset_t *set, struct pt_regs *regs)
{
struct sigframe __user *frame;
- int err = 0;
+ int err = 0, sig = ksig->sig;
int signal;

- frame = get_sigframe(ka, regs->regs[REG_SP], sizeof(*frame));
+ frame = get_sigframe(&ksig->ka, regs->regs[REG_SP], sizeof(*frame));

if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
- goto give_sigsegv;
+ return -EFAULT;

signal = current_thread_info()->exec_domain
&& current_thread_info()->exec_domain->signal_invmap
@@ -400,7 +395,7 @@ static int setup_frame(int sig, struct k

/* Give up earlier as i386, in case */
if (err)
- goto give_sigsegv;
+ return -EFAULT;

if (_NSIG_WORDS > 1) {
err |= __copy_to_user(frame->extramask, &set->sig[1],
@@ -408,16 +403,16 @@ static int setup_frame(int sig, struct k

/* Give up earlier as i386, in case */
if (err)
- goto give_sigsegv;
+ return -EFAULT;

/* Set up to return from userspace. If provided, use a stub
already in userspace. */
- if (ka->sa.sa_flags & SA_RESTORER) {
+ if (ksig->ka.sa.sa_flags & SA_RESTORER) {
/*
* On SH5 all edited pointers are subject to NEFF
*/
DEREF_REG_PR = neff_sign_extend((unsigned long)
- ka->sa.sa_restorer | 0x1);
+ ksig->ka->sa.sa_restorer | 0x1);
} else {
/*
* Different approach on SH5.
@@ -435,7 +430,7 @@ static int setup_frame(int sig, struct k

if (__copy_to_user(frame->retcode,
(void *)((unsigned long)sa_default_restorer & (~1)), 16) != 0)
- goto give_sigsegv;
+ return -EFAULT;

/* Cohere the trampoline with the I-cache. */
flush_cache_sigtramp(DEREF_REG_PR-1);
@@ -460,7 +455,7 @@ static int setup_frame(int sig, struct k
regs->regs[REG_ARG2] = (unsigned long long)(unsigned long)(signed long)&frame->sc;
regs->regs[REG_ARG3] = (unsigned long long)(unsigned long)(signed long)&frame->sc;

- regs->pc = neff_sign_extend((unsigned long)ka->sa.sa_handler);
+ regs->pc = neff_sign_extend((unsigned long)ksig->ka.sa.sa_handler);

set_fs(USER_DS);

@@ -471,23 +466,19 @@ static int setup_frame(int sig, struct k
DEREF_REG_PR >> 32, DEREF_REG_PR & 0xffffffff);

return 0;
-
-give_sigsegv:
- force_sigsegv(sig, current);
- return -EFAULT;
}

-static int setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
- sigset_t *set, struct pt_regs *regs)
+static int setup_rt_frame(struct ksignal *kig, sigset_t *set,
+ struct pt_regs *regs)
{
struct rt_sigframe __user *frame;
- int err = 0;
+ int err = 0, sig = ksig->sig;
int signal;

- frame = get_sigframe(ka, regs->regs[REG_SP], sizeof(*frame));
+ frame = get_sigframe(&ksig->ka, regs->regs[REG_SP], sizeof(*frame));

if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
- goto give_sigsegv;
+ return -EFAULT;

signal = current_thread_info()->exec_domain
&& current_thread_info()->exec_domain->signal_invmap
@@ -497,11 +488,11 @@ static int setup_rt_frame(int sig, struc

err |= __put_user(&frame->info, &frame->pinfo);
err |= __put_user(&frame->uc, &frame->puc);
- err |= copy_siginfo_to_user(&frame->info, info);
+ err |= copy_siginfo_to_user(&frame->info, &ksig->info);

/* Give up earlier as i386, in case */
if (err)
- goto give_sigsegv;
+ return -EFAULT;

/* Create the ucontext. */
err |= __put_user(0, &frame->uc.uc_flags);
@@ -513,16 +504,16 @@ static int setup_rt_frame(int sig, struc

/* Give up earlier as i386, in case */
if (err)
- goto give_sigsegv;
+ return -EFAULT;

/* Set up to return from userspace. If provided, use a stub
already in userspace. */
- if (ka->sa.sa_flags & SA_RESTORER) {
+ if (ksig->ka.sa.sa_flags & SA_RESTORER) {
/*
* On SH5 all edited pointers are subject to NEFF
*/
DEREF_REG_PR = neff_sign_extend((unsigned long)
- ka->sa.sa_restorer | 0x1);
+ ksig->ka.sa.sa_restorer | 0x1);
} else {
/*
* Different approach on SH5.
@@ -540,7 +531,7 @@ static int setup_rt_frame(int sig, struc

if (__copy_to_user(frame->retcode,
(void *)((unsigned long)sa_default_rt_restorer & (~1)), 16) != 0)
- goto give_sigsegv;
+ return -EFAULT;

/* Cohere the trampoline with the I-cache. */
flush_icache_range(DEREF_REG_PR-1, DEREF_REG_PR-1+15);
@@ -554,7 +545,7 @@ static int setup_rt_frame(int sig, struc
regs->regs[REG_ARG1] = signal; /* Arg for signal handler */
regs->regs[REG_ARG2] = (unsigned long long)(unsigned long)(signed long)&frame->info;
regs->regs[REG_ARG3] = (unsigned long long)(unsigned long)(signed long)&frame->uc.uc_mcontext;
- regs->pc = neff_sign_extend((unsigned long)ka->sa.sa_handler);
+ regs->pc = neff_sign_extend((unsigned long)ksig->ka.sa.sa_handler);

set_fs(USER_DS);

@@ -564,33 +555,24 @@ static int setup_rt_frame(int sig, struc
DEREF_REG_PR >> 32, DEREF_REG_PR & 0xffffffff);

return 0;
-
-give_sigsegv:
- force_sigsegv(sig, current);
- return -EFAULT;
}

/*
* OK, we're invoking a handler
*/
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)
{
sigset_t *oldset = sigmask_to_save();
int ret;

/* Set up the stack frame */
- if (ka->sa.sa_flags & SA_SIGINFO)
- ret = setup_rt_frame(sig, ka, info, oldset, regs);
+ if (ksig->ka.sa.sa_flags & SA_SIGINFO)
+ ret = setup_rt_frame(ksig, oldset, regs);
else
- ret = setup_frame(sig, ka, oldset, regs);
-
- if (ret)
- return;
+ ret = setup_frame(ksig, oldset, regs);

- signal_delivered(sig, info, ka, regs,
- test_thread_flag(TIF_SINGLESTEP));
+ signal_setup_done(ret, ksig, test_thread_flag(TIF_SINGLESTEP));
}

asmlinkage void do_notify_resume(struct pt_regs *regs, unsigned long thread_info_flags)
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