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Diffstat (limited to 'arch/um/os-Linux/signal.c')
-rw-r--r--arch/um/os-Linux/signal.c131
1 files changed, 62 insertions, 69 deletions
diff --git a/arch/um/os-Linux/signal.c b/arch/um/os-Linux/signal.c
index b98f7ea2d2f6..e9800b0b5689 100644
--- a/arch/um/os-Linux/signal.c
+++ b/arch/um/os-Linux/signal.c
@@ -1,26 +1,21 @@
/*
* Copyright (C) 2004 PathScale, Inc
+ * Copyright (C) 2004 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
* Licensed under the GPL
*/
-#include <signal.h>
-#include <stdio.h>
-#include <unistd.h>
#include <stdlib.h>
-#include <errno.h>
#include <stdarg.h>
-#include <string.h>
-#include <sys/mman.h>
-#include "user.h"
-#include "signal_kern.h"
-#include "sysdep/sigcontext.h"
-#include "sysdep/barrier.h"
-#include "sigcontext.h"
-#include "mode.h"
+#include <errno.h>
+#include <signal.h>
+#include <strings.h>
#include "os.h"
+#include "sysdep/barrier.h"
+#include "sysdep/sigcontext.h"
+#include "user.h"
-/* These are the asynchronous signals. SIGVTALRM and SIGARLM are handled
- * together under SIGVTALRM_BIT. SIGPROF is excluded because we want to
+/*
+ * These are the asynchronous signals. SIGPROF is excluded because we want to
* be able to profile all of UML, not just the non-critical sections. If
* profiling is not thread-safe, then that is not my problem. We can disable
* profiling when SMP is enabled in that case.
@@ -31,10 +26,8 @@
#define SIGVTALRM_BIT 1
#define SIGVTALRM_MASK (1 << SIGVTALRM_BIT)
-#define SIGALRM_BIT 2
-#define SIGALRM_MASK (1 << SIGALRM_BIT)
-
-/* These are used by both the signal handlers and
+/*
+ * These are used by both the signal handlers and
* block/unblock_signals. I don't want modifications cached in a
* register - they must go straight to memory.
*/
@@ -46,34 +39,27 @@ void sig_handler(int sig, struct sigcontext *sc)
int enabled;
enabled = signals_enabled;
- if(!enabled && (sig == SIGIO)){
+ if (!enabled && (sig == SIGIO)) {
pending |= SIGIO_MASK;
return;
}
block_signals();
- CHOOSE_MODE_PROC(sig_handler_common_tt, sig_handler_common_skas,
- sig, sc);
+ sig_handler_common_skas(sig, sc);
set_signals(enabled);
}
-static void real_alarm_handler(int sig, struct sigcontext *sc)
+static void real_alarm_handler(struct sigcontext *sc)
{
- union uml_pt_regs regs;
+ struct uml_pt_regs regs;
- if(sig == SIGALRM)
- switch_timers(0);
-
- if(sc != NULL)
+ if (sc != NULL)
copy_sc(&regs, sc);
- regs.skas.is_user = 0;
+ regs.is_user = 0;
unblock_signals();
- timer_handler(sig, &regs);
-
- if(sig == SIGALRM)
- switch_timers(1);
+ timer_handler(SIGVTALRM, &regs);
}
void alarm_handler(int sig, struct sigcontext *sc)
@@ -81,27 +67,30 @@ void alarm_handler(int sig, struct sigcontext *sc)
int enabled;
enabled = signals_enabled;
- if(!signals_enabled){
- if(sig == SIGVTALRM)
- pending |= SIGVTALRM_MASK;
- else pending |= SIGALRM_MASK;
-
+ if (!signals_enabled) {
+ pending |= SIGVTALRM_MASK;
return;
}
block_signals();
- real_alarm_handler(sig, sc);
+ real_alarm_handler(sc);
set_signals(enabled);
}
+void timer_init(void)
+{
+ set_handler(SIGVTALRM, (__sighandler_t) alarm_handler,
+ SA_ONSTACK | SA_RESTART, SIGUSR1, SIGIO, SIGWINCH, -1);
+}
+
void set_sigstack(void *sig_stack, int size)
{
stack_t stack = ((stack_t) { .ss_flags = 0,
.ss_sp = (__ptr_t) sig_stack,
.ss_size = size - sizeof(void *) });
- if(sigaltstack(&stack, NULL) != 0)
+ if (sigaltstack(&stack, NULL) != 0)
panic("enabling signal stack failed, errno = %d\n", errno);
}
@@ -111,7 +100,7 @@ void remove_sigstack(void)
.ss_sp = NULL,
.ss_size = 0 });
- if(sigaltstack(&stack, NULL) != 0)
+ if (sigaltstack(&stack, NULL) != 0)
panic("disabling signal stack failed, errno = %d\n", errno);
}
@@ -135,26 +124,27 @@ void handle_signal(int sig, struct sigcontext *sc)
* with this interrupt.
*/
bail = to_irq_stack(&pending);
- if(bail)
+ if (bail)
return;
nested = pending & 1;
pending &= ~1;
- while((sig = ffs(pending)) != 0){
+ while ((sig = ffs(pending)) != 0){
sig--;
pending &= ~(1 << sig);
(*handlers[sig])(sig, sc);
}
- /* Again, pending comes back with a mask of signals
+ /*
+ * Again, pending comes back with a mask of signals
* that arrived while tearing down the stack. If this
* is non-zero, we just go back, set up the stack
* again, and handle the new interrupts.
*/
- if(!nested)
+ if (!nested)
pending = from_irq_stack(nested);
- } while(pending);
+ } while (pending);
}
extern void hard_handler(int sig);
@@ -172,18 +162,18 @@ void set_handler(int sig, void (*handler)(int), int flags, ...)
sigemptyset(&action.sa_mask);
va_start(ap, flags);
- while((mask = va_arg(ap, int)) != -1)
+ 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)
+ if (sigaction(sig, &action, NULL) < 0)
panic("sigaction failed - errno = %d\n", errno);
sigemptyset(&sig_mask);
sigaddset(&sig_mask, sig);
- if(sigprocmask(SIG_UNBLOCK, &sig_mask, NULL) < 0)
+ if (sigprocmask(SIG_UNBLOCK, &sig_mask, NULL) < 0)
panic("sigprocmask failed - errno = %d\n", errno);
}
@@ -194,13 +184,14 @@ int change_sig(int signal, int on)
sigemptyset(&sigset);
sigaddset(&sigset, signal);
sigprocmask(on ? SIG_UNBLOCK : SIG_BLOCK, &sigset, &old);
- return(!sigismember(&old, signal));
+ return !sigismember(&old, signal);
}
void block_signals(void)
{
signals_enabled = 0;
- /* This must return with signals disabled, so this barrier
+ /*
+ * This must return with signals disabled, so this barrier
* ensures that writes are flushed out before the return.
* This might matter if gcc figures out how to inline this and
* decides to shuffle this code into the caller.
@@ -212,27 +203,31 @@ void unblock_signals(void)
{
int save_pending;
- if(signals_enabled == 1)
+ if (signals_enabled == 1)
return;
- /* We loop because the IRQ handler returns with interrupts off. So,
+ /*
+ * We loop because the IRQ handler returns with interrupts off. So,
* interrupts may have arrived and we need to re-enable them and
* recheck pending.
*/
- while(1){
- /* Save and reset save_pending after enabling signals. This
+ while(1) {
+ /*
+ * Save and reset save_pending after enabling signals. This
* way, pending won't be changed while we're reading it.
*/
signals_enabled = 1;
- /* Setting signals_enabled and reading pending must
+ /*
+ * Setting signals_enabled and reading pending must
* happen in this order.
*/
mb();
save_pending = pending;
- if(save_pending == 0){
- /* This must return with signals enabled, so
+ if (save_pending == 0) {
+ /*
+ * This must return with signals enabled, so
* this barrier ensures that writes are
* flushed out before the return. This might
* matter if gcc figures out how to inline
@@ -245,26 +240,24 @@ void unblock_signals(void)
pending = 0;
- /* We have pending interrupts, so disable signals, as the
+ /*
+ * We have pending interrupts, so disable signals, as the
* handlers expect them off when they are called. They will
* be enabled again above.
*/
signals_enabled = 0;
- /* Deal with SIGIO first because the alarm handler might
+ /*
+ * Deal with SIGIO first because the alarm handler might
* schedule, leaving the pending SIGIO stranded until we come
* back here.
*/
- if(save_pending & SIGIO_MASK)
- CHOOSE_MODE_PROC(sig_handler_common_tt,
- sig_handler_common_skas, SIGIO, NULL);
-
- if(save_pending & SIGALRM_MASK)
- real_alarm_handler(SIGALRM, NULL);
+ if (save_pending & SIGIO_MASK)
+ sig_handler_common_skas(SIGIO, NULL);
- if(save_pending & SIGVTALRM_MASK)
- real_alarm_handler(SIGVTALRM, NULL);
+ if (save_pending & SIGVTALRM_MASK)
+ real_alarm_handler(NULL);
}
}
@@ -276,11 +269,11 @@ int get_signals(void)
int set_signals(int enable)
{
int ret;
- if(signals_enabled == enable)
+ if (signals_enabled == enable)
return enable;
ret = signals_enabled;
- if(enable)
+ if (enable)
unblock_signals();
else block_signals();
generated by cgit v1.2.3 (git 2.25.1) at 2024-04-18 19:46:59 +0000