Imported Upstream version 1.4upstream/1.4

1 files changed, 122 insertions, 0 deletions

diff --git a/src/runtime/signal_386.c b/src/runtime/signal_386.c
new file mode 100644
index 000000000..30a7488bd
--- /dev/null
+++ b/src/runtime/signal_386.c
@@ -0,0 +1,122 @@
+// Copyright 2013 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.
+
+// +build darwin dragonfly freebsd linux nacl netbsd openbsd
+
+#include "runtime.h"
+#include "defs_GOOS_GOARCH.h"
+#include "os_GOOS.h"
+#include "signal_GOOS_GOARCH.h"
+#include "signals_GOOS.h"
+
+void
+runtime·dumpregs(Siginfo *info, void *ctxt)
+{
+	USED(info);
+	USED(ctxt);
+	
+	runtime·printf("eax     %x\n", SIG_EAX(info, ctxt));
+	runtime·printf("ebx     %x\n", SIG_EBX(info, ctxt));
+	runtime·printf("ecx     %x\n", SIG_ECX(info, ctxt));
+	runtime·printf("edx     %x\n", SIG_EDX(info, ctxt));
+	runtime·printf("edi     %x\n", SIG_EDI(info, ctxt));
+	runtime·printf("esi     %x\n", SIG_ESI(info, ctxt));
+	runtime·printf("ebp     %x\n", SIG_EBP(info, ctxt));
+	runtime·printf("esp     %x\n", SIG_ESP(info, ctxt));
+	runtime·printf("eip     %x\n", SIG_EIP(info, ctxt));
+	runtime·printf("eflags  %x\n", SIG_EFLAGS(info, ctxt));
+	runtime·printf("cs      %x\n", SIG_CS(info, ctxt));
+	runtime·printf("fs      %x\n", SIG_FS(info, ctxt));
+	runtime·printf("gs      %x\n", SIG_GS(info, ctxt));
+}
+
+void
+runtime·sighandler(int32 sig, Siginfo *info, void *ctxt, G *gp)
+{
+	uintptr *sp;
+	SigTab *t;
+	bool crash;
+
+	if(sig == SIGPROF) {
+		runtime·sigprof((byte*)SIG_EIP(info, ctxt), (byte*)SIG_ESP(info, ctxt), nil, gp, g->m);
+		return;
+	}
+
+	t = &runtime·sigtab[sig];
+	if(SIG_CODE0(info, ctxt) != SI_USER && (t->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 = SIG_CODE0(info, ctxt);
+		gp->sigcode1 = SIG_CODE1(info, ctxt);
+		gp->sigpc = SIG_EIP(info, ctxt);
+
+#ifdef GOOS_darwin
+		// Work around Leopard bug that doesn't set FPE_INTDIV.
+		// Look at instruction to see if it is a divide.
+		// Not necessary in Snow Leopard (si_code will be != 0).
+		if(sig == SIGFPE && gp->sigcode0 == 0) {
+			byte *pc;
+			pc = (byte*)gp->sigpc;
+			if(pc[0] == 0x66)	// 16-bit instruction prefix
+				pc++;
+			if(pc[0] == 0xF6 || pc[0] == 0xF7)
+				gp->sigcode0 = FPE_INTDIV;
+		}
+#endif
+
+		// Only push runtime·sigpanic if eip != 0.
+		// If 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(SIG_EIP(info, ctxt) != 0) {
+			sp = (uintptr*)SIG_ESP(info, ctxt);
+			*--sp = SIG_EIP(info, ctxt);
+			SIG_ESP(info, ctxt) = (uintptr)sp;
+		}
+		SIG_EIP(info, ctxt) = (uintptr)runtime·sigpanic;
+		return;
+	}
+
+	if(SIG_CODE0(info, ctxt) == SI_USER || (t->flags & SigNotify))
+		if(runtime·sigsend(sig))
+			return;
+	if(t->flags & SigKill)
+		runtime·exit(2);
+	if(!(t->flags & SigThrow))
+		return;
+
+	g->m->throwing = 1;
+	g->m->caughtsig = gp;
+	runtime·startpanic();
+
+	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", SIG_EIP(info, ctxt));
+	if(g->m->lockedg != nil && g->m->ncgo > 0 && gp == g->m->g0) {
+		runtime·printf("signal arrived during cgo execution\n");
+		gp = g->m->lockedg;
+	}
+	runtime·printf("\n");
+
+	if(runtime·gotraceback(&crash)){
+		runtime·goroutineheader(gp);
+		runtime·tracebacktrap(SIG_EIP(info, ctxt), SIG_ESP(info, ctxt), 0, gp);
+		runtime·tracebackothers(gp);
+		runtime·printf("\n");
+		runtime·dumpregs(info, ctxt);
+	}
+	
+	if(crash)
+		runtime·crash();
+
+	runtime·exit(2);
+}