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-rw-r--r--src/pkg/runtime/linux/386/signal.c184
1 files changed, 184 insertions, 0 deletions
diff --git a/src/pkg/runtime/linux/386/signal.c b/src/pkg/runtime/linux/386/signal.c
new file mode 100644
index 000000000..8916e10bd
--- /dev/null
+++ b/src/pkg/runtime/linux/386/signal.c
@@ -0,0 +1,184 @@
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+#include "runtime.h"
+#include "defs.h"
+#include "signals.h"
+#include "os.h"
+
+void
+runtime·dumpregs(Sigcontext *r)
+{
+ runtime·printf("eax %x\n", r->eax);
+ runtime·printf("ebx %x\n", r->ebx);
+ runtime·printf("ecx %x\n", r->ecx);
+ runtime·printf("edx %x\n", r->edx);
+ runtime·printf("edi %x\n", r->edi);
+ runtime·printf("esi %x\n", r->esi);
+ runtime·printf("ebp %x\n", r->ebp);
+ runtime·printf("esp %x\n", r->esp);
+ runtime·printf("eip %x\n", r->eip);
+ runtime·printf("eflags %x\n", r->eflags);
+ runtime·printf("cs %x\n", r->cs);
+ runtime·printf("fs %x\n", r->fs);
+ runtime·printf("gs %x\n", r->gs);
+}
+
+/*
+ * This assembler routine takes the args from registers, puts them on the stack,
+ * and calls sighandler().
+ */
+extern void runtime·sigtramp(void);
+extern void runtime·sigignore(void); // just returns
+extern void runtime·sigreturn(void); // calls runtime·sigreturn
+
+String
+runtime·signame(int32 sig)
+{
+ if(sig < 0 || sig >= NSIG)
+ return runtime·emptystring;
+ return runtime·gostringnocopy((byte*)runtime·sigtab[sig].name);
+}
+
+void
+runtime·sighandler(int32 sig, Siginfo *info, void *context, G *gp)
+{
+ Ucontext *uc;
+ Sigcontext *r;
+ uintptr *sp;
+
+ uc = context;
+ r = &uc->uc_mcontext;
+
+ if(sig == SIGPROF) {
+ runtime·sigprof((uint8*)r->eip, (uint8*)r->esp, nil, gp);
+ return;
+ }
+
+ if(gp != nil && (runtime·sigtab[sig].flags & SigPanic)) {
+ // Make it look like a call to the signal func.
+ // Have to pass arguments out of band since
+ // augmenting the stack frame would break
+ // the unwinding code.
+ gp->sig = sig;
+ gp->sigcode0 = info->si_code;
+ gp->sigcode1 = ((uintptr*)info)[3];
+ gp->sigpc = r->eip;
+
+ // Only push runtime·sigpanic if r->eip != 0.
+ // If r->eip == 0, probably panicked because of a
+ // call to a nil func. Not pushing that onto sp will
+ // make the trace look like a call to runtime·sigpanic instead.
+ // (Otherwise the trace will end at runtime·sigpanic and we
+ // won't get to see who faulted.)
+ if(r->eip != 0) {
+ sp = (uintptr*)r->esp;
+ *--sp = r->eip;
+ r->esp = (uintptr)sp;
+ }
+ r->eip = (uintptr)runtime·sigpanic;
+ return;
+ }
+
+ if(runtime·sigtab[sig].flags & SigQueue) {
+ if(runtime·sigsend(sig) || (runtime·sigtab[sig].flags & SigIgnore))
+ return;
+ runtime·exit(2); // SIGINT, SIGTERM, etc
+ }
+
+ if(runtime·panicking) // traceback already printed
+ runtime·exit(2);
+ runtime·panicking = 1;
+
+ if(sig < 0 || sig >= NSIG)
+ runtime·printf("Signal %d\n", sig);
+ else
+ runtime·printf("%s\n", runtime·sigtab[sig].name);
+
+ runtime·printf("PC=%X\n", r->eip);
+ runtime·printf("\n");
+
+ if(runtime·gotraceback()){
+ runtime·traceback((void*)r->eip, (void*)r->esp, 0, gp);
+ runtime·tracebackothers(gp);
+ runtime·dumpregs(r);
+ }
+
+ runtime·exit(2);
+}
+
+void
+runtime·signalstack(byte *p, int32 n)
+{
+ Sigaltstack st;
+
+ st.ss_sp = p;
+ st.ss_size = n;
+ st.ss_flags = 0;
+ runtime·sigaltstack(&st, nil);
+}
+
+static void
+sigaction(int32 i, void (*fn)(int32, Siginfo*, void*, G*), bool restart)
+{
+ Sigaction sa;
+
+ runtime·memclr((byte*)&sa, sizeof sa);
+ sa.sa_flags = SA_ONSTACK | SA_SIGINFO | SA_RESTORER;
+ if(restart)
+ sa.sa_flags |= SA_RESTART;
+ sa.sa_mask = ~0ULL;
+ sa.sa_restorer = (void*)runtime·sigreturn;
+ if(fn == runtime·sighandler)
+ fn = (void*)runtime·sigtramp;
+ sa.k_sa_handler = fn;
+ runtime·rt_sigaction(i, &sa, nil, 8);
+}
+
+void
+runtime·initsig(int32 queue)
+{
+ int32 i;
+ void *fn;
+
+ runtime·siginit();
+
+ for(i = 0; i<NSIG; i++) {
+ if(runtime·sigtab[i].flags) {
+ if((runtime·sigtab[i].flags & SigQueue) != queue)
+ continue;
+ if(runtime·sigtab[i].flags & (SigCatch | SigQueue))
+ fn = runtime·sighandler;
+ else
+ fn = runtime·sigignore;
+ sigaction(i, fn, (runtime·sigtab[i].flags & SigRestart) != 0);
+ }
+ }
+}
+
+void
+runtime·resetcpuprofiler(int32 hz)
+{
+ Itimerval it;
+
+ runtime·memclr((byte*)&it, sizeof it);
+ if(hz == 0) {
+ runtime·setitimer(ITIMER_PROF, &it, nil);
+ sigaction(SIGPROF, SIG_IGN, true);
+ } else {
+ sigaction(SIGPROF, runtime·sighandler, true);
+ it.it_interval.tv_sec = 0;
+ it.it_interval.tv_usec = 1000000 / hz;
+ it.it_value = it.it_interval;
+ runtime·setitimer(ITIMER_PROF, &it, nil);
+ }
+ m->profilehz = hz;
+}
+
+void
+os·sigpipe(void)
+{
+ sigaction(SIGPIPE, SIG_DFL, false);
+ runtime·raisesigpipe();
+}