Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=22e38f29328296d9d4cc33e46fd32a63e807abaf
Commit: 22e38f29328296d9d4cc33e46fd32a63e807abaf
Parent: 791cc501d422be96d6e3098faf6471ba29f4dd33
Author: Benjamin Herrenschmidt <[EMAIL PROTECTED]>
AuthorDate: Mon Jun 4 15:15:49 2007 +1000
Committer: Paul Mackerras <[EMAIL PROTECTED]>
CommitDate: Thu Jun 14 22:29:57 2007 +1000
[POWERPC] Make syscall restart code more common
This patch moves the code in signal_32.c and signal_64.c for handling
syscall restart into a common signal.c file and converge around a single
implementation that is based on the 32 bits one, using trap, ccr
and r3 rather than the special "result" field for deciding what to do.
The "result" field is now pretty much deprecated. We still set it for
the sake of whatever might rely on it in userland but we no longer use
it's content.
This, along with a previous patch that enables ptracers to write to
"trap" and "orig_r3" should allow gdb to properly handle syscall
restarting.
Signed-off-by: Benjamin Herrenschmidt <[EMAIL PROTECTED]>
Signed-off-by: Paul Mackerras <[EMAIL PROTECTED]>
---
arch/powerpc/kernel/Makefile | 3 +-
arch/powerpc/kernel/signal.c | 65 +++++++++++++++++++++++++++++++++++++++
arch/powerpc/kernel/signal.h | 16 +++++++++
arch/powerpc/kernel/signal_32.c | 28 ++--------------
arch/powerpc/kernel/signal_64.c | 59 ++++-------------------------------
5 files changed, 94 insertions(+), 77 deletions(-)
diff --git a/arch/powerpc/kernel/Makefile b/arch/powerpc/kernel/Makefile
index 08ce7de..eb6a33e 100644
--- a/arch/powerpc/kernel/Makefile
+++ b/arch/powerpc/kernel/Makefile
@@ -12,7 +12,8 @@ endif
obj-y := semaphore.o cputable.o ptrace.o syscalls.o \
irq.o align.o signal_32.o pmc.o vdso.o \
- init_task.o process.o systbl.o idle.o
+ init_task.o process.o systbl.o idle.o \
+ signal.o
obj-y += vdso32/
obj-$(CONFIG_PPC64) += setup_64.o binfmt_elf32.o sys_ppc32.o \
signal_64.o ptrace32.o \
diff --git a/arch/powerpc/kernel/signal.c b/arch/powerpc/kernel/signal.c
new file mode 100644
index 0000000..88a1254
--- /dev/null
+++ b/arch/powerpc/kernel/signal.c
@@ -0,0 +1,65 @@
+/*
+ * Common signal handling code for both 32 and 64 bits
+ *
+ * Copyright (c) 2007 Benjamin Herrenschmidt, IBM Coproration
+ * Extracted from signal_32.c and signal_64.c
+ *
+ * This file is subject to the terms and conditions of the GNU General
+ * Public License. See the file README.legal in the main directory of
+ * this archive for more details.
+ */
+
+#include <linux/ptrace.h>
+#include <linux/signal.h>
+#include <asm/unistd.h>
+
+void check_syscall_restart(struct pt_regs *regs, struct k_sigaction *ka,
+ int has_handler)
+{
+ unsigned long ret = regs->gpr[3];
+ int restart = 1;
+
+ /* syscall ? */
+ if (TRAP(regs) != 0x0C00)
+ return;
+
+ /* error signalled ? */
+ if (!(regs->ccr & 0x10000000))
+ return;
+
+ switch (ret) {
+ case ERESTART_RESTARTBLOCK:
+ case ERESTARTNOHAND:
+ /* ERESTARTNOHAND means that the syscall should only be
+ * restarted if there was no handler for the signal, and since
+ * we only get here if there is a handler, we dont restart.
+ */
+ restart = !has_handler;
+ break;
+ case ERESTARTSYS:
+ /* ERESTARTSYS means to restart the syscall if there is no
+ * handler or the handler was registered with SA_RESTART
+ */
+ restart = !has_handler || (ka->sa.sa_flags & SA_RESTART) != 0;
+ break;
+ case ERESTARTNOINTR:
+ /* ERESTARTNOINTR means that the syscall should be
+ * called again after the signal handler returns.
+ */
+ break;
+ default:
+ return;
+ }
+ if (restart) {
+ if (ret == ERESTART_RESTARTBLOCK)
+ regs->gpr[0] = __NR_restart_syscall;
+ else
+ regs->gpr[3] = regs->orig_gpr3;
+ regs->nip -= 4;
+ regs->result = 0;
+ } else {
+ regs->result = -EINTR;
+ regs->gpr[3] = EINTR;
+ regs->ccr |= 0x10000000;
+ }
+}
diff --git a/arch/powerpc/kernel/signal.h b/arch/powerpc/kernel/signal.h
new file mode 100644
index 0000000..1e8dfb8
--- /dev/null
+++ b/arch/powerpc/kernel/signal.h
@@ -0,0 +1,16 @@
+/*
+ * Copyright (c) 2007 Benjamin Herrenschmidt, IBM Coproration
+ * Extracted from signal_32.c and signal_64.c
+ *
+ * This file is subject to the terms and conditions of the GNU General
+ * Public License. See the file README.legal in the main directory of
+ * this archive for more details.
+ */
+
+#ifndef _POWERPC_ARCH_SIGNAL_H
+#define _POWERPC_ARCH_SIGNAL_H
+
+extern void check_syscall_restart(struct pt_regs *regs, struct k_sigaction *ka,
+ int has_handler);
+
+#endif /* _POWERPC_ARCH_SIGNAL_H */
diff --git a/arch/powerpc/kernel/signal_32.c b/arch/powerpc/kernel/signal_32.c
index dd1dca5..e5cc803 100644
--- a/arch/powerpc/kernel/signal_32.c
+++ b/arch/powerpc/kernel/signal_32.c
@@ -51,6 +51,8 @@
#include <asm/pgtable.h>
#endif
+#include "signal.h"
+
#undef DEBUG_SIG
#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
@@ -1156,30 +1158,8 @@ int do_signal(sigset_t *oldset, struct pt_regs *regs)
#ifdef CONFIG_PPC32
no_signal:
#endif
- if (TRAP(regs) == 0x0C00 /* System Call! */
- && regs->ccr & 0x10000000 /* error signalled */
- && ((ret = regs->gpr[3]) == ERESTARTSYS
- || ret == ERESTARTNOHAND || ret == ERESTARTNOINTR
- || ret == ERESTART_RESTARTBLOCK)) {
-
- if (signr > 0
- && (ret == ERESTARTNOHAND || ret == ERESTART_RESTARTBLOCK
- || (ret == ERESTARTSYS
- && !(ka.sa.sa_flags & SA_RESTART)))) {
- /* make the system call return an EINTR error */
- regs->result = -EINTR;
- regs->gpr[3] = EINTR;
- /* note that the cr0.SO bit is already set */
- } else {
- regs->nip -= 4; /* Back up & retry system call */
- regs->result = 0;
- regs->trap = 0;
- if (ret == ERESTART_RESTARTBLOCK)
- regs->gpr[0] = __NR_restart_syscall;
- else
- regs->gpr[3] = regs->orig_gpr3;
- }
- }
+ /* Is there any syscall restart business here ? */
+ check_syscall_restart(regs, &ka, signr > 0);
if (signr == 0) {
/* No signal to deliver -- put the saved sigmask back */
diff --git a/arch/powerpc/kernel/signal_64.c b/arch/powerpc/kernel/signal_64.c
index 1ce0ae3..5d2faf0 100644
--- a/arch/powerpc/kernel/signal_64.c
+++ b/arch/powerpc/kernel/signal_64.c
@@ -34,6 +34,8 @@
#include <asm/syscalls.h>
#include <asm/vdso.h>
+#include "signal.h"
+
#define DEBUG_SIG 0
#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
@@ -463,41 +465,6 @@ static int handle_signal(unsigned long sig, struct
k_sigaction *ka,
return ret;
}
-static inline void syscall_restart(struct pt_regs *regs, struct k_sigaction
*ka)
-{
- switch ((int)regs->result) {
- case -ERESTART_RESTARTBLOCK:
- case -ERESTARTNOHAND:
- /* ERESTARTNOHAND means that the syscall should only be
- * restarted if there was no handler for the signal, and since
- * we only get here if there is a handler, we dont restart.
- */
- regs->result = -EINTR;
- regs->gpr[3] = EINTR;
- regs->ccr |= 0x10000000;
- break;
- case -ERESTARTSYS:
- /* ERESTARTSYS means to restart the syscall if there is no
- * handler or the handler was registered with SA_RESTART
- */
- if (!(ka->sa.sa_flags & SA_RESTART)) {
- regs->result = -EINTR;
- regs->gpr[3] = EINTR;
- regs->ccr |= 0x10000000;
- break;
- }
- /* fallthrough */
- case -ERESTARTNOINTR:
- /* ERESTARTNOINTR means that the syscall should be
- * called again after the signal handler returns.
- */
- regs->gpr[3] = regs->orig_gpr3;
- regs->nip -= 4;
- regs->result = 0;
- break;
- }
-}
-
/*
* Note that 'init' is a special process: it doesn't get signals it doesn't
* want to handle. Thus you cannot kill init even with a SIGKILL even by
@@ -522,13 +489,13 @@ int do_signal(sigset_t *oldset, struct pt_regs *regs)
oldset = ¤t->blocked;
signr = get_signal_to_deliver(&info, &ka, regs, NULL);
+
+ /* Is there any syscall restart business here ? */
+ check_syscall_restart(regs, &ka, signr > 0);
+
if (signr > 0) {
int ret;
- /* Whee! Actually deliver the signal. */
- if (TRAP(regs) == 0x0C00)
- syscall_restart(regs, &ka);
-
/*
* Reenable the DABR before delivering the signal to
* user space. The DABR will have been cleared if it
@@ -537,6 +504,7 @@ int do_signal(sigset_t *oldset, struct pt_regs *regs)
if (current->thread.dabr)
set_dabr(current->thread.dabr);
+ /* Whee! Actually deliver the signal. */
ret = handle_signal(signr, &ka, &info, oldset, regs);
/* If a signal was successfully delivered, the saved sigmask is
in
@@ -547,19 +515,6 @@ int do_signal(sigset_t *oldset, struct pt_regs *regs)
return ret;
}
- if (TRAP(regs) == 0x0C00) { /* System Call! */
- if ((int)regs->result == -ERESTARTNOHAND ||
- (int)regs->result == -ERESTARTSYS ||
- (int)regs->result == -ERESTARTNOINTR) {
- regs->gpr[3] = regs->orig_gpr3;
- regs->nip -= 4; /* Back up & retry system call */
- regs->result = 0;
- } else if ((int)regs->result == -ERESTART_RESTARTBLOCK) {
- regs->gpr[0] = __NR_restart_syscall;
- regs->nip -= 4;
- regs->result = 0;
- }
- }
/* No signal to deliver -- put the saved sigmask back */
if (test_thread_flag(TIF_RESTORE_SIGMASK)) {
clear_thread_flag(TIF_RESTORE_SIGMASK);
-
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