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-rw-r--r--arch/um/include/sysdep-i386/signal.h27
-rw-r--r--arch/um/include/sysdep-x86_64/signal.h29
-rw-r--r--arch/um/os-Linux/irq.c2
-rw-r--r--arch/um/os-Linux/main.c34
-rw-r--r--arch/um/os-Linux/process.c12
-rw-r--r--arch/um/os-Linux/signal.c31
-rw-r--r--arch/um/os-Linux/skas/process.c17
-rw-r--r--arch/um/os-Linux/sys-i386/Makefile2
-rw-r--r--arch/um/os-Linux/sys-i386/signal.c15
-rw-r--r--arch/um/os-Linux/sys-x86_64/Makefile2
-rw-r--r--arch/um/os-Linux/sys-x86_64/signal.c16
-rw-r--r--arch/um/os-Linux/time.c4
12 files changed, 102 insertions, 89 deletions
diff --git a/arch/um/include/sysdep-i386/signal.h b/arch/um/include/sysdep-i386/signal.h
deleted file mode 100644
index 07518b16213..00000000000
--- a/arch/um/include/sysdep-i386/signal.h
+++ /dev/null
@@ -1,27 +0,0 @@
-/*
- * Copyright (C) 2004 PathScale, Inc
- * Licensed under the GPL
- */
-
-#ifndef __I386_SIGNAL_H_
-#define __I386_SIGNAL_H_
-
-#include <signal.h>
-
-#define ARCH_SIGHDLR_PARAM int sig
-
-#define ARCH_GET_SIGCONTEXT(sc, sig) \
- do sc = (struct sigcontext *) (&sig + 1); while(0)
-
-#endif
-
-/*
- * Overrides for Emacs so that we follow Linus's tabbing style.
- * Emacs will notice this stuff at the end of the file and automatically
- * adjust the settings for this buffer only. This must remain at the end
- * of the file.
- * ---------------------------------------------------------------------------
- * Local variables:
- * c-file-style: "linux"
- * End:
- */
diff --git a/arch/um/include/sysdep-x86_64/signal.h b/arch/um/include/sysdep-x86_64/signal.h
deleted file mode 100644
index 6142897af3d..00000000000
--- a/arch/um/include/sysdep-x86_64/signal.h
+++ /dev/null
@@ -1,29 +0,0 @@
-/*
- * Copyright (C) 2004 PathScale, Inc
- * Licensed under the GPL
- */
-
-#ifndef __X86_64_SIGNAL_H_
-#define __X86_64_SIGNAL_H_
-
-#define ARCH_SIGHDLR_PARAM int sig
-
-#define ARCH_GET_SIGCONTEXT(sc, sig_addr) \
- do { \
- struct ucontext *__uc; \
- asm("movq %%rdx, %0" : "=r" (__uc)); \
- sc = (struct sigcontext *) &__uc->uc_mcontext; \
- } while(0)
-
-#endif
-
-/*
- * Overrides for Emacs so that we follow Linus's tabbing style.
- * Emacs will notice this stuff at the end of the file and automatically
- * adjust the settings for this buffer only. This must remain at the end
- * of the file.
- * ---------------------------------------------------------------------------
- * Local variables:
- * c-file-style: "linux"
- * End:
- */
diff --git a/arch/um/os-Linux/irq.c b/arch/um/os-Linux/irq.c
index 7555bf9c33d..a97206df5b5 100644
--- a/arch/um/os-Linux/irq.c
+++ b/arch/um/os-Linux/irq.c
@@ -132,7 +132,7 @@ void os_set_pollfd(int i, int fd)
void os_set_ioignore(void)
{
- set_handler(SIGIO, SIG_IGN, 0, -1);
+ signal(SIGIO, SIG_IGN);
}
void init_irq_signals(int on_sigstack)
diff --git a/arch/um/os-Linux/main.c b/arch/um/os-Linux/main.c
index 90912aaca7a..d1c5670787d 100644
--- a/arch/um/os-Linux/main.c
+++ b/arch/um/os-Linux/main.c
@@ -67,13 +67,32 @@ static __init void do_uml_initcalls(void)
static void last_ditch_exit(int sig)
{
- signal(SIGINT, SIG_DFL);
- signal(SIGTERM, SIG_DFL);
- signal(SIGHUP, SIG_DFL);
uml_cleanup();
exit(1);
}
+static void install_fatal_handler(int sig)
+{
+ struct sigaction action;
+
+ /* All signals are enabled in this handler ... */
+ sigemptyset(&action.sa_mask);
+
+ /* ... including the signal being handled, plus we want the
+ * handler reset to the default behavior, so that if an exit
+ * handler is hanging for some reason, the UML will just die
+ * after this signal is sent a second time.
+ */
+ action.sa_flags = SA_RESETHAND | SA_NODEFER;
+ action.sa_restorer = NULL;
+ action.sa_handler = last_ditch_exit;
+ if(sigaction(sig, &action, NULL) < 0){
+ printf("failed to install handler for signal %d - errno = %d\n",
+ errno);
+ exit(1);
+ }
+}
+
#define UML_LIB_PATH ":/usr/lib/uml"
static void setup_env_path(void)
@@ -158,9 +177,12 @@ int main(int argc, char **argv, char **envp)
}
new_argv[argc] = NULL;
- set_handler(SIGINT, last_ditch_exit, SA_ONESHOT | SA_NODEFER, -1);
- set_handler(SIGTERM, last_ditch_exit, SA_ONESHOT | SA_NODEFER, -1);
- set_handler(SIGHUP, last_ditch_exit, SA_ONESHOT | SA_NODEFER, -1);
+ /* Allow these signals to bring down a UML if all other
+ * methods of control fail.
+ */
+ install_fatal_handler(SIGINT);
+ install_fatal_handler(SIGTERM);
+ install_fatal_handler(SIGHUP);
scan_elf_aux( envp);
diff --git a/arch/um/os-Linux/process.c b/arch/um/os-Linux/process.c
index 3afde92ad2c..ff203625a4b 100644
--- a/arch/um/os-Linux/process.c
+++ b/arch/um/os-Linux/process.c
@@ -246,7 +246,17 @@ void init_new_thread_stack(void *sig_stack, void (*usr1_handler)(int))
set_sigstack(sig_stack, pages * page_size());
flags = SA_ONSTACK;
}
- if(usr1_handler) set_handler(SIGUSR1, usr1_handler, flags, -1);
+ if(usr1_handler){
+ struct sigaction sa;
+
+ sa.sa_handler = usr1_handler;
+ sigemptyset(&sa.sa_mask);
+ sa.sa_flags = flags;
+ sa.sa_restorer = NULL;
+ if(sigaction(SIGUSR1, &sa, NULL) < 0)
+ panic("init_new_thread_stack - sigaction failed - "
+ "errno = %d\n", errno);
+ }
}
void init_new_thread_signals(void)
diff --git a/arch/um/os-Linux/signal.c b/arch/um/os-Linux/signal.c
index 60e4faedf25..55b62e2b8f4 100644
--- a/arch/um/os-Linux/signal.c
+++ b/arch/um/os-Linux/signal.c
@@ -15,7 +15,6 @@
#include "user.h"
#include "signal_kern.h"
#include "sysdep/sigcontext.h"
-#include "sysdep/signal.h"
#include "sigcontext.h"
#include "mode.h"
#include "os.h"
@@ -38,18 +37,10 @@
static int signals_enabled = 1;
static int pending = 0;
-void sig_handler(ARCH_SIGHDLR_PARAM)
+void sig_handler(int sig, struct sigcontext *sc)
{
- struct sigcontext *sc;
int enabled;
- /* Must be the first thing that this handler does - x86_64 stores
- * the sigcontext in %rdx, and we need to save it before it has a
- * chance to get trashed.
- */
-
- ARCH_GET_SIGCONTEXT(sc, sig);
-
enabled = signals_enabled;
if(!enabled && (sig == SIGIO)){
pending |= SIGIO_MASK;
@@ -84,13 +75,10 @@ static void real_alarm_handler(int sig, struct sigcontext *sc)
}
-void alarm_handler(ARCH_SIGHDLR_PARAM)
+void alarm_handler(int sig, struct sigcontext *sc)
{
- struct sigcontext *sc;
int enabled;
- ARCH_GET_SIGCONTEXT(sc, sig);
-
enabled = signals_enabled;
if(!signals_enabled){
if(sig == SIGVTALRM)
@@ -126,6 +114,10 @@ void remove_sigstack(void)
panic("disabling signal stack failed, errno = %d\n", errno);
}
+void (*handlers[_NSIG])(int sig, struct sigcontext *sc);
+
+extern void hard_handler(int sig);
+
void set_handler(int sig, void (*handler)(int), int flags, ...)
{
struct sigaction action;
@@ -133,13 +125,16 @@ void set_handler(int sig, void (*handler)(int), int flags, ...)
sigset_t sig_mask;
int mask;
- va_start(ap, flags);
- action.sa_handler = handler;
+ handlers[sig] = (void (*)(int, struct sigcontext *)) handler;
+ action.sa_handler = hard_handler;
+
sigemptyset(&action.sa_mask);
- while((mask = va_arg(ap, int)) != -1){
+
+ va_start(ap, flags);
+ while((mask = va_arg(ap, int)) != -1)
sigaddset(&action.sa_mask, mask);
- }
va_end(ap);
+
action.sa_flags = flags;
action.sa_restorer = NULL;
if(sigaction(sig, &action, NULL) < 0)
diff --git a/arch/um/os-Linux/skas/process.c b/arch/um/os-Linux/skas/process.c
index 50418a5e713..88ff0de95cd 100644
--- a/arch/um/os-Linux/skas/process.c
+++ b/arch/um/os-Linux/skas/process.c
@@ -189,14 +189,25 @@ static int userspace_tramp(void *stack)
}
}
if(!ptrace_faultinfo && (stack != NULL)){
+ struct sigaction sa;
+
unsigned long v = UML_CONFIG_STUB_CODE +
(unsigned long) stub_segv_handler -
(unsigned long) &__syscall_stub_start;
set_sigstack((void *) UML_CONFIG_STUB_DATA, page_size());
- set_handler(SIGSEGV, (void *) v, SA_ONSTACK,
- SIGIO, SIGWINCH, SIGALRM, SIGVTALRM,
- SIGUSR1, -1);
+ sigemptyset(&sa.sa_mask);
+ sigaddset(&sa.sa_mask, SIGIO);
+ sigaddset(&sa.sa_mask, SIGWINCH);
+ sigaddset(&sa.sa_mask, SIGALRM);
+ sigaddset(&sa.sa_mask, SIGVTALRM);
+ sigaddset(&sa.sa_mask, SIGUSR1);
+ sa.sa_flags = SA_ONSTACK;
+ sa.sa_handler = (void *) v;
+ sa.sa_restorer = NULL;
+ if(sigaction(SIGSEGV, &sa, NULL) < 0)
+ panic("userspace_tramp - setting SIGSEGV handler "
+ "failed - errno = %d\n", errno);
}
os_stop_process(os_getpid());
diff --git a/arch/um/os-Linux/sys-i386/Makefile b/arch/um/os-Linux/sys-i386/Makefile
index b3213613c41..37806621b25 100644
--- a/arch/um/os-Linux/sys-i386/Makefile
+++ b/arch/um/os-Linux/sys-i386/Makefile
@@ -3,7 +3,7 @@
# Licensed under the GPL
#
-obj-$(CONFIG_MODE_SKAS) = registers.o tls.o
+obj-$(CONFIG_MODE_SKAS) = registers.o signal.o tls.o
USER_OBJS := $(obj-y)
diff --git a/arch/um/os-Linux/sys-i386/signal.c b/arch/um/os-Linux/sys-i386/signal.c
new file mode 100644
index 00000000000..0d3eae51835
--- /dev/null
+++ b/arch/um/os-Linux/sys-i386/signal.c
@@ -0,0 +1,15 @@
+/*
+ * Copyright (C) 2006 Jeff Dike (jdike@addtoit.com)
+ * Licensed under the GPL
+ */
+
+#include <signal.h>
+
+extern void (*handlers[])(int sig, struct sigcontext *sc);
+
+void hard_handler(int sig)
+{
+ struct sigcontext *sc = (struct sigcontext *) (&sig + 1);
+
+ (*handlers[sig])(sig, sc);
+}
diff --git a/arch/um/os-Linux/sys-x86_64/Makefile b/arch/um/os-Linux/sys-x86_64/Makefile
index 340ef26f594..f67842a7735 100644
--- a/arch/um/os-Linux/sys-x86_64/Makefile
+++ b/arch/um/os-Linux/sys-x86_64/Makefile
@@ -3,7 +3,7 @@
# Licensed under the GPL
#
-obj-$(CONFIG_MODE_SKAS) = registers.o
+obj-$(CONFIG_MODE_SKAS) = registers.o signal.o
USER_OBJS := $(obj-y)
diff --git a/arch/um/os-Linux/sys-x86_64/signal.c b/arch/um/os-Linux/sys-x86_64/signal.c
new file mode 100644
index 00000000000..3f369e5f976
--- /dev/null
+++ b/arch/um/os-Linux/sys-x86_64/signal.c
@@ -0,0 +1,16 @@
+/*
+ * Copyright (C) 2006 Jeff Dike (jdike@addtoit.com)
+ * Licensed under the GPL
+ */
+
+#include <signal.h>
+
+extern void (*handlers[])(int sig, struct sigcontext *sc);
+
+void hard_handler(int sig)
+{
+ struct ucontext *uc;
+ asm("movq %%rdx, %0" : "=r" (uc));
+
+ (*handlers[sig])(sig, (struct sigcontext *) &uc->uc_mcontext);
+}
diff --git a/arch/um/os-Linux/time.c b/arch/um/os-Linux/time.c
index 4ae73c0e548..7f5ebbadca6 100644
--- a/arch/um/os-Linux/time.c
+++ b/arch/um/os-Linux/time.c
@@ -40,8 +40,8 @@ void disable_timer(void)
printk("disnable_timer - setitimer failed, errno = %d\n",
errno);
/* If there are signals already queued, after unblocking ignore them */
- set_handler(SIGALRM, SIG_IGN, 0, -1);
- set_handler(SIGVTALRM, SIG_IGN, 0, -1);
+ signal(SIGALRM, SIG_IGN);
+ signal(SIGVTALRM, SIG_IGN);
}
void switch_timers(int to_real)
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-10 06:47:36 +0000