mirror of https://github.com/golang/go.git
151 lines
4.2 KiB
C
151 lines
4.2 KiB
C
// Copyright 2011 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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#include "runtime.h"
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#include "defs_GOOS_GOARCH.h"
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#include "os_GOOS.h"
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void
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runtime·dumpregs(Context *r)
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{
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runtime·printf("rax %X\n", r->Rax);
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runtime·printf("rbx %X\n", r->Rbx);
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runtime·printf("rcx %X\n", r->Rcx);
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runtime·printf("rdx %X\n", r->Rdx);
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runtime·printf("rdi %X\n", r->Rdi);
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runtime·printf("rsi %X\n", r->Rsi);
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runtime·printf("rbp %X\n", r->Rbp);
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runtime·printf("rsp %X\n", r->Rsp);
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runtime·printf("r8 %X\n", r->R8 );
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runtime·printf("r9 %X\n", r->R9 );
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runtime·printf("r10 %X\n", r->R10);
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runtime·printf("r11 %X\n", r->R11);
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runtime·printf("r12 %X\n", r->R12);
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runtime·printf("r13 %X\n", r->R13);
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runtime·printf("r14 %X\n", r->R14);
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runtime·printf("r15 %X\n", r->R15);
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runtime·printf("rip %X\n", r->Rip);
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runtime·printf("rflags %X\n", r->EFlags);
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runtime·printf("cs %X\n", (uint64)r->SegCs);
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runtime·printf("fs %X\n", (uint64)r->SegFs);
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runtime·printf("gs %X\n", (uint64)r->SegGs);
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}
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bool
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runtime·isgoexception(ExceptionRecord *info, Context *r)
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{
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extern byte runtime·text[], runtime·etext[];
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// Only handle exception if executing instructions in Go binary
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// (not Windows library code).
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if(r->Rip < (uint64)runtime·text || (uint64)runtime·etext < r->Rip)
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return false;
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if(!runtime·issigpanic(info->ExceptionCode))
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return false;
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return true;
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}
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// Called by sigtramp from Windows VEH handler.
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// Return value signals whether the exception has been handled (EXCEPTION_CONTINUE_EXECUTION)
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// or should be made available to other handlers in the chain (EXCEPTION_CONTINUE_SEARCH).
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uint32
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runtime·exceptionhandler(ExceptionRecord *info, Context *r, G *gp)
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{
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uintptr *sp;
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if(!runtime·isgoexception(info, r))
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return EXCEPTION_CONTINUE_SEARCH;
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// Make it look like a call to the signal func.
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// Have to pass arguments out of band since
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// augmenting the stack frame would break
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// the unwinding code.
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gp->sig = info->ExceptionCode;
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gp->sigcode0 = info->ExceptionInformation[0];
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gp->sigcode1 = info->ExceptionInformation[1];
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gp->sigpc = r->Rip;
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// Only push runtime·sigpanic if r->rip != 0.
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// If r->rip == 0, probably panicked because of a
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// call to a nil func. Not pushing that onto sp will
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// make the trace look like a call to runtime·sigpanic instead.
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// (Otherwise the trace will end at runtime·sigpanic and we
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// won't get to see who faulted.)
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if(r->Rip != 0) {
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sp = (uintptr*)r->Rsp;
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*--sp = r->Rip;
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r->Rsp = (uintptr)sp;
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}
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r->Rip = (uintptr)runtime·sigpanic;
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return EXCEPTION_CONTINUE_EXECUTION;
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}
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// It seems Windows searches ContinueHandler's list even
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// if ExceptionHandler returns EXCEPTION_CONTINUE_EXECUTION.
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// firstcontinuehandler will stop that search,
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// if exceptionhandler did the same earlier.
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uint32
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runtime·firstcontinuehandler(ExceptionRecord *info, Context *r, G *gp)
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{
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USED(gp);
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if(!runtime·isgoexception(info, r))
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return EXCEPTION_CONTINUE_SEARCH;
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return EXCEPTION_CONTINUE_EXECUTION;
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}
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// lastcontinuehandler is reached, because runtime cannot handle
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// current exception. lastcontinuehandler will print crash info and exit.
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uint32
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runtime·lastcontinuehandler(ExceptionRecord *info, Context *r, G *gp)
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{
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bool crash;
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if(runtime·panicking) // traceback already printed
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runtime·exit(2);
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runtime·panicking = 1;
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runtime·printf("Exception %x %p %p %p\n", info->ExceptionCode,
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info->ExceptionInformation[0], info->ExceptionInformation[1], r->Rip);
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runtime·printf("PC=%X\n", r->Rip);
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if(g->m->lockedg != nil && g->m->ncgo > 0 && gp == g->m->g0) {
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runtime·printf("signal arrived during cgo execution\n");
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gp = g->m->lockedg;
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}
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runtime·printf("\n");
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if(runtime·gotraceback(&crash)){
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runtime·tracebacktrap(r->Rip, r->Rsp, 0, gp);
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runtime·tracebackothers(gp);
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runtime·dumpregs(r);
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}
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if(crash)
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runtime·crash();
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runtime·exit(2);
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return 0; // not reached
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}
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void
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runtime·sigenable(uint32 sig)
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{
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USED(sig);
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}
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void
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runtime·sigdisable(uint32 sig)
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{
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USED(sig);
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}
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void
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runtime·dosigprof(Context *r, G *gp, M *mp)
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{
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runtime·sigprof((uint8*)r->Rip, (uint8*)r->Rsp, nil, gp, mp);
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}
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