From aeb43984ec7c86aee220cc56146e0127de4ce2e3 Mon Sep 17 00:00:00 2001
From: Rob Pike <r@golang.org>
Date: Sat, 21 Jun 2008 15:36:23 -0700
Subject: add signal handling and traceback support therein. factor the runtime
 into architecture-dependent and -independent pieces. ditto for the OS
 dependence.

SVN=124020
---
 src/runtime/rt1_amd64_linux.c | 75 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 75 insertions(+)
 create mode 100644 src/runtime/rt1_amd64_linux.c

(limited to 'src/runtime/rt1_amd64_linux.c')

diff --git a/src/runtime/rt1_amd64_linux.c b/src/runtime/rt1_amd64_linux.c
new file mode 100644
index 0000000000..de6ac7f044
--- /dev/null
+++ b/src/runtime/rt1_amd64_linux.c
@@ -0,0 +1,75 @@
+// 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 "signals.h"
+
+/*
+ * This assembler routine takes the args from registers, puts them on the stack,
+ * and calls sighandler().
+ */
+extern void sigtramp();
+
+/*
+ * Rudimentary reverse-engineered definition of signal interface.
+ * You'd think it would be documented.
+ */
+typedef struct siginfo {
+	int32	si_signo;		/* signal number */
+	int32	si_errno;		/* errno association */
+	int32	si_code;		/* signal code */
+	int32	si_status;		/* exit value */
+	void	*si_addr;		/* faulting address */
+	/* more stuff here */
+} siginfo;
+
+typedef struct  sigaction {
+ 	union {
+		void    (*sa_handler)(int32);
+		void    (*sa_sigaction)(int32, siginfo *, void *);
+	} u;		     /* signal handler */
+	int32     sa_flags;		     /* see signal options below */
+	uint8 sa_mask[2];		     /* signal mask to apply. BUG: 2 is a guess */
+} sigaction;
+
+void
+sighandler(int32 sig, siginfo* info, void** context) {
+	int32 i;
+
+	if(sig < 0 || sig >= NSIG){
+		prints("Signal ");
+		sys_printint(sig);
+	}else{
+		prints(sigtab[sig].name);
+	}
+	prints("\nFaulting address: 0x");
+	sys_printpointer(info->si_addr);
+	prints("\nPC: 0x");
+	sys_printpointer(context[21]);
+	prints("\nSP: 0x");
+	sys_printpointer(context[20]);
+	prints("\n");
+	traceback(context[21], context[20]);	/* empirically discovered locations */
+	sys_breakpoint();
+	sys_exit(2);
+}
+
+sigaction a;
+
+void
+initsig(void)
+{
+	int32 i;
+	a.u.sa_sigaction = (void*)sigtramp;
+	a.sa_flags = 1|2|4|0x10000000|0x20000000|0x40000000|0x80000000;
+	//a.sa_flags |= SA_SIGINFO;
+	a.sa_flags = ~0;	/* BUG: why is this needed? */
+	for(i=0; i<sizeof(a.sa_mask); i++)
+		a.sa_mask[i] = 0xFF;
+	//a.sa_mask[1] = (1 << (11-1));
+	for(i = 0; i <NSIG; i++)
+		if(sigtab[i].catch){
+			sys_rt_sigaction(i, &a, (void*)0, 8);
+		}
+}
-- 
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