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https://github.com/golang/go
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55a54691f9
Typing ^\ delivers the SIGQUIT to all threads, it appears. R=golang-dev, r, iant CC=golang-dev https://golang.org/cl/5657044
137 lines
3.4 KiB
C
137 lines
3.4 KiB
C
// Copyright 2009 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 "signals_GOOS.h"
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#include "os_GOOS.h"
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extern void runtime·sigtramp(void);
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typedef struct sigaction {
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union {
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void (*__sa_handler)(int32);
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void (*__sa_sigaction)(int32, Siginfo*, void *);
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} __sigaction_u; /* signal handler */
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int32 sa_flags; /* see signal options below */
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int64 sa_mask; /* signal mask to apply */
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} Sigaction;
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void
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runtime·dumpregs(Mcontext *r)
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{
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runtime·printf("eax %x\n", r->mc_eax);
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runtime·printf("ebx %x\n", r->mc_ebx);
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runtime·printf("ecx %x\n", r->mc_ecx);
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runtime·printf("edx %x\n", r->mc_edx);
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runtime·printf("edi %x\n", r->mc_edi);
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runtime·printf("esi %x\n", r->mc_esi);
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runtime·printf("ebp %x\n", r->mc_ebp);
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runtime·printf("esp %x\n", r->mc_esp);
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runtime·printf("eip %x\n", r->mc_eip);
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runtime·printf("eflags %x\n", r->mc_eflags);
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runtime·printf("cs %x\n", r->mc_cs);
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runtime·printf("fs %x\n", r->mc_fs);
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runtime·printf("gs %x\n", r->mc_gs);
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}
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void
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runtime·sighandler(int32 sig, Siginfo *info, void *context, G *gp)
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{
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Ucontext *uc;
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Mcontext *r;
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uintptr *sp;
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SigTab *t;
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uc = context;
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r = &uc->uc_mcontext;
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if(sig == SIGPROF) {
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runtime·sigprof((uint8*)r->mc_eip, (uint8*)r->mc_esp, nil, gp);
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return;
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}
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t = &runtime·sigtab[sig];
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if(info->si_code != SI_USER && (t->flags & SigPanic)) {
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if(gp == nil)
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goto Throw;
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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 = sig;
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gp->sigcode0 = info->si_code;
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gp->sigcode1 = (uintptr)info->si_addr;
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gp->sigpc = r->mc_eip;
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// Only push runtime·sigpanic if r->mc_eip != 0.
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// If r->mc_eip == 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->mc_eip != 0) {
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sp = (uintptr*)r->mc_esp;
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*--sp = r->mc_eip;
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r->mc_esp = (uintptr)sp;
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}
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r->mc_eip = (uintptr)runtime·sigpanic;
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return;
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}
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if(info->si_code == SI_USER || (t->flags & SigNotify))
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if(runtime·sigsend(sig))
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return;
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if(t->flags & SigKill)
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runtime·exit(2);
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if(!(t->flags & SigThrow))
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return;
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Throw:
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runtime·startpanic();
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if(sig < 0 || sig >= NSIG)
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runtime·printf("Signal %d\n", sig);
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else
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runtime·printf("%s\n", runtime·sigtab[sig].name);
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runtime·printf("PC=%X\n", r->mc_eip);
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runtime·printf("\n");
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if(runtime·gotraceback()){
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runtime·traceback((void*)r->mc_eip, (void*)r->mc_esp, 0, gp);
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runtime·tracebackothers(gp);
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runtime·dumpregs(r);
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}
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runtime·exit(2);
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}
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void
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runtime·signalstack(byte *p, int32 n)
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{
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Sigaltstack st;
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st.ss_sp = (int8*)p;
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st.ss_size = n;
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st.ss_flags = 0;
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runtime·sigaltstack(&st, nil);
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}
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void
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runtime·setsig(int32 i, void (*fn)(int32, Siginfo*, void*, G*), bool restart)
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{
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Sigaction sa;
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runtime·memclr((byte*)&sa, sizeof sa);
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sa.sa_flags = SA_SIGINFO|SA_ONSTACK;
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if(restart)
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sa.sa_flags |= SA_RESTART;
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sa.sa_mask = ~0ULL;
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if (fn == runtime·sighandler)
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fn = (void*)runtime·sigtramp;
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sa.__sigaction_u.__sa_sigaction = (void*)fn;
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runtime·sigaction(i, &sa, nil);
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}
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