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Date: Wed, 6 Nov 2013 11:17:31 +0100
From: Jonas Bonn <jonas@...thpole.se>
To: richard@....at
Cc: linux-kernel@...r.kernel.org, linux@...ts.openrisc.net,
Jonas Bonn <jonas@...thpole.se>
Subject: [PATCH 1/1] openrisc: Use get_signal() signal_setup_done()
From: Richard Weinberger <richard@....at>
Use the more generic functions get_signal() signal_setup_done()
for signal delivery.
Signed-off-by: Richard Weinberger <richard@....at>
Signed-off-by: Jonas Bonn <jonas@...thpole.se>
---
Hi Richard,
What's the status of this patch series? Are these lined up for 3.13 already?
The changes look good but I've got a big rework of the signal handling code
for OpenRISC and the patch doesn't apply cleanly. I've reworked your patch
(see below) and would just like you to verify that I haven't messed anything
up. If it's OK by you, I will take the below patch directly into the OpenRISC
tree.
Best regards,
Jonas
arch/openrisc/kernel/signal.c | 59 ++++++++++++++++---------------------------
1 file changed, 22 insertions(+), 37 deletions(-)
diff --git a/arch/openrisc/kernel/signal.c b/arch/openrisc/kernel/signal.c
index c277ec8..66775bc 100644
--- a/arch/openrisc/kernel/signal.c
+++ b/arch/openrisc/kernel/signal.c
@@ -166,20 +166,21 @@ static inline void __user *get_sigframe(struct k_sigaction *ka,
* trampoline which performs the syscall sigreturn, or a provided
* user-mode trampoline.
*/
-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 *frame;
unsigned long return_ip;
int err = 0;
- frame = get_sigframe(ka, regs, sizeof(*frame));
+ frame = get_sigframe(&ksig->ka, regs, sizeof(*frame));
+
if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
- goto give_sigsegv;
+ return -EFAULT;
/* Create siginfo. */
- if (ka->sa.sa_flags & SA_SIGINFO)
- err |= copy_siginfo_to_user(&frame->info, info);
+ if (ksig->ka.sa.sa_flags & SA_SIGINFO)
+ err |= copy_siginfo_to_user(&frame->info, &ksig->info);
/* Create the ucontext. */
err |= __put_user(0, &frame->uc.uc_flags);
@@ -190,7 +191,7 @@ static int setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
if (err)
- goto give_sigsegv;
+ return -EFAULT;
/* trampoline - the desired return ip is the retcode itself */
return_ip = (unsigned long)&frame->retcode;
@@ -204,14 +205,14 @@ static int setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
err |= __put_user(0x15000000, (unsigned long *)(frame->retcode + 8));
if (err)
- goto give_sigsegv;
+ return -EFAULT;
/* TODO what is the current->exec_domain stuff and invmap ? */
/* Set up registers for signal handler */
- regs->pc = (unsigned long)ka->sa.sa_handler; /* what we enter NOW */
+ regs->pc = (unsigned long)ksig->ka.sa.sa_handler; /* what we enter NOW */
regs->gpr[9] = (unsigned long)return_ip; /* what we enter LATER */
- regs->gpr[3] = (unsigned long)sig; /* arg 1: signo */
+ regs->gpr[3] = (unsigned long)ksig->sig; /* arg 1: signo */
regs->gpr[4] = (unsigned long)&frame->info; /* arg 2: (siginfo_t*) */
regs->gpr[5] = (unsigned long)&frame->uc; /* arg 3: ucontext */
@@ -219,25 +220,16 @@ static int setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
regs->sp = (unsigned long)frame;
return 0;
-
-give_sigsegv:
- force_sigsegv(sig, current);
- return -EFAULT;
}
static inline 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)
{
int ret;
- ret = setup_rt_frame(sig, ka, info, sigmask_to_save(), regs);
- if (ret)
- return;
+ ret = setup_rt_frame(ksig, sigmask_to_save(), regs);
- signal_delivered(sig, info, ka, regs,
- test_thread_flag(TIF_SINGLESTEP));
+ signal_setup_done(ret, ksig, test_thread_flag(TIF_SINGLESTEP));
}
/*
@@ -254,9 +246,7 @@ handle_signal(unsigned long sig,
int do_signal(struct pt_regs *regs, int syscall)
{
- siginfo_t info;
- int signr;
- struct k_sigaction ka;
+ struct ksignal ksig;
unsigned long continue_addr = 0;
unsigned long restart_addr = 0;
unsigned long retval = 0;
@@ -286,28 +276,23 @@ int do_signal(struct pt_regs *regs, int syscall)
}
/*
- * Get the signal to deliver. When running under ptrace, at this
- * point the debugger may change all our registers ...
+ * Get the signal to deliver. During the call to get_signal the
+ * debugger may change all our registers so we may need to revert
+ * the decision to restart the syscall; specifically, if the PC is
+ * changed, don't restart the syscall.
*/
- signr = get_signal_to_deliver(&info, &ka, regs, NULL);
- /*
- * Depending on the signal settings we may need to revert the
- * decision to restart the system call. But skip this if a
- * debugger has chosen to restart at a different PC.
- */
- if (signr > 0) {
+ if (get_signal(&ksig)) {
if (unlikely(restart) && regs->pc == restart_addr) {
if (retval == -ERESTARTNOHAND ||
retval == -ERESTART_RESTARTBLOCK
|| (retval == -ERESTARTSYS
- && !(ka.sa.sa_flags & SA_RESTART))) {
+ && !(ksig.ka.sa.sa_flags & SA_RESTART))) {
/* No automatic restart */
regs->gpr[11] = -EINTR;
regs->pc = continue_addr;
}
}
-
- handle_signal(signr, &info, &ka, regs);
+ handle_signal(&ksig, regs);
} else {
/* no handler */
restore_saved_sigmask();
--
1.8.1.2
--
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