1 files changed, 102 insertions, 0 deletions
diff --git a/src/lib/runtime/linux/386/signal.c b/src/lib/runtime/linux/386/signal.c
new file mode 100644
index 000000000..7dfca6bb4
--- /dev/null
+++ b/src/lib/runtime/linux/386/signal.c
@@ -0,0 +1,102 @@
+// 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
+dumpregs(Sigcontext *r)
+{
+	printf("eax     %X\n", r->eax);
+	printf("ebx     %X\n", r->ebx);
+	printf("ecx     %X\n", r->ecx);
+	printf("edx     %X\n", r->edx);
+	printf("edi     %X\n", r->edi);
+	printf("esi     %X\n", r->esi);
+	printf("ebp     %X\n", r->ebp);
+	printf("esp     %X\n", r->esp);
+	printf("eip     %X\n", r->eip);
+	printf("eflags  %X\n", r->eflags);
+	printf("cs      %X\n", r->cs);
+	printf("fs      %X\n", r->fs);
+	printf("gs      %X\n", r->gs);
+}
+
+/*
+ * This assembler routine takes the args from registers, puts them on the stack,
+ * and calls sighandler().
+ */
+extern void sigtramp(void);
+extern void sigignore(void);	// just returns
+extern void sigreturn(void);	// calls sigreturn
+
+void
+sighandler(int32 sig, Siginfo* info, void* context)
+{
+	Ucontext *uc;
+	Sigcontext *sc;
+
+	if(panicking)	// traceback already printed
+		exit(2);
+	panicking = 1;
+
+	uc = context;
+	sc = &uc->uc_mcontext;
+
+	if(sig < 0 || sig >= NSIG)
+		printf("Signal %d\n", sig);
+	else
+		printf("%s\n", sigtab[sig].name);
+
+	printf("Faulting address: %p\n", *(void**)info->_sifields);
+	printf("pc=%X\n", sc->eip);
+	printf("\n");
+
+	if(gotraceback()){
+		traceback((void*)sc->eip, (void*)sc->esp, m->curg);
+		tracebackothers(m->curg);
+		dumpregs(sc);
+	}
+
+	breakpoint();
+	exit(2);
+}
+
+void
+signalstack(byte *p, int32 n)
+{
+	Sigaltstack st;
+
+	st.ss_sp = p;
+	st.ss_size = n;
+	st.ss_flags = 0;
+	sigaltstack(&st, nil);
+}
+
+void
+initsig(void)
+{
+	static Sigaction sa;
+
+	int32 i;
+	sa.sa_flags = SA_ONSTACK | SA_SIGINFO | SA_RESTORER;
+	sa.sa_mask = 0xFFFFFFFFFFFFFFFFULL;
+	sa.sa_restorer = (void*)sigreturn;
+	for(i = 0; i<NSIG; i++) {
+		if(sigtab[i].flags) {
+			if(sigtab[i].flags & SigCatch)
+				*(void**)sa._u = (void*)sigtramp;	// handler
+			else
+				*(void**)sa._u = (void*)sigignore;	// handler
+			if(sigtab[i].flags & SigRestart)
+				sa.sa_flags |= SA_RESTART;
+			else
+				sa.sa_flags &= ~SA_RESTART;
+			rt_sigaction(i, &sa, nil, 8);
+		}
+	}
+}
+