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Diffstat (limited to 'src/pkg/runtime/signal_amd64x.c')
-rw-r--r--src/pkg/runtime/signal_amd64x.c156
1 files changed, 156 insertions, 0 deletions
diff --git a/src/pkg/runtime/signal_amd64x.c b/src/pkg/runtime/signal_amd64x.c
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index 000000000..04026f32f
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+++ b/src/pkg/runtime/signal_amd64x.c
@@ -0,0 +1,156 @@
+// 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 amd64 amd64p32
+// +build darwin dragonfly freebsd linux nacl netbsd openbsd solaris
+
+#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("rax %X\n", SIG_RAX(info, ctxt));
+ runtime·printf("rbx %X\n", SIG_RBX(info, ctxt));
+ runtime·printf("rcx %X\n", SIG_RCX(info, ctxt));
+ runtime·printf("rdx %X\n", SIG_RDX(info, ctxt));
+ runtime·printf("rdi %X\n", SIG_RDI(info, ctxt));
+ runtime·printf("rsi %X\n", SIG_RSI(info, ctxt));
+ runtime·printf("rbp %X\n", SIG_RBP(info, ctxt));
+ runtime·printf("rsp %X\n", SIG_RSP(info, ctxt));
+ runtime·printf("r8 %X\n", SIG_R8(info, ctxt) );
+ runtime·printf("r9 %X\n", SIG_R9(info, ctxt) );
+ runtime·printf("r10 %X\n", SIG_R10(info, ctxt));
+ runtime·printf("r11 %X\n", SIG_R11(info, ctxt));
+ runtime·printf("r12 %X\n", SIG_R12(info, ctxt));
+ runtime·printf("r13 %X\n", SIG_R13(info, ctxt));
+ runtime·printf("r14 %X\n", SIG_R14(info, ctxt));
+ runtime·printf("r15 %X\n", SIG_R15(info, ctxt));
+ runtime·printf("rip %X\n", SIG_RIP(info, ctxt));
+ runtime·printf("rflags %X\n", SIG_RFLAGS(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_RIP(info, ctxt), (byte*)SIG_RSP(info, ctxt), nil, gp, m);
+ return;
+ }
+
+#ifdef GOOS_darwin
+ // x86-64 has 48-bit virtual addresses. The top 16 bits must echo bit 47.
+ // The hardware delivers a different kind of fault for a malformed address
+ // than it does for an attempt to access a valid but unmapped address.
+ // OS X 10.9.2 mishandles the malformed address case, making it look like
+ // a user-generated signal (like someone ran kill -SEGV ourpid).
+ // We pass user-generated signals to os/signal, or else ignore them.
+ // Doing that here - and returning to the faulting code - results in an
+ // infinite loop. It appears the best we can do is rewrite what the kernel
+ // delivers into something more like the truth. The address used below
+ // has very little chance of being the one that caused the fault, but it is
+ // malformed, it is clearly not a real pointer, and if it does get printed
+ // in real life, people will probably search for it and find this code.
+ // There are no Google hits for b01dfacedebac1e or 0xb01dfacedebac1e
+ // as I type this comment.
+ if(sig == SIGSEGV && SIG_CODE0(info, ctxt) == SI_USER) {
+ SIG_CODE0(info, ctxt) = SI_USER+1;
+ info->si_addr = (void*)(uintptr)0xb01dfacedebac1eULL;
+ }
+#endif
+
+ 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_RIP(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]&0xF0) == 0x40) // 64-bit REX prefix
+ pc++;
+ else 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 rip != 0.
+ // If rip == 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_RIP(info, ctxt) != 0) {
+ sp = (uintptr*)SIG_RSP(info, ctxt);
+ if(sizeof(uintreg) > sizeof(uintptr))
+ *--sp = 0;
+ *--sp = SIG_RIP(info, ctxt);
+ SIG_RSP(info, ctxt) = (uintptr)sp;
+ }
+ SIG_RIP(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;
+
+ m->throwing = 1;
+ 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_RIP(info, ctxt));
+ if(m->lockedg != nil && m->ncgo > 0 && gp == m->g0) {
+ runtime·printf("signal arrived during cgo execution\n");
+ gp = m->lockedg;
+ }
+ runtime·printf("\n");
+
+ if(runtime·gotraceback(&crash)){
+ runtime·goroutineheader(gp);
+ runtime·traceback(SIG_RIP(info, ctxt), SIG_RSP(info, ctxt), 0, gp);
+ runtime·tracebackothers(gp);
+ runtime·printf("\n");
+ runtime·dumpregs(info, ctxt);
+ }
+
+ if(crash)
+ runtime·crash();
+
+ runtime·exit(2);
+}