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Viewing changes to src/pkg/runtime/signal_linux_amd64.c

  • Committer: Package Import Robot
  • Author(s): Adam Conrad
  • Date: 2013-07-08 05:52:37 UTC
  • mfrom: (29.1.1 sid)
  • Revision ID: package-import@ubuntu.com-20130708055237-at01839e0hp8z3ni
Tags: 2:1.1-1ubuntu1
016-armhf-elf-header.patch: Use correct ELF header for armhf binaries.

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src/pkg/runtime/signal_linux_amd64.c
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// 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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void
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runtime·dumpregs(Sigcontext *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->cs);
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        runtime·printf("fs      %X\n", (uint64)r->fs);
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        runtime·printf("gs      %X\n", (uint64)r->gs);
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}
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/*
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 * This assembler routine takes the args from registers, puts them on the stack,
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 * and calls sighandler().
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 */
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extern void runtime·sigtramp(void);
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extern void runtime·sigreturn(void);    // calls runtime·sigreturn
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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 *mc;
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        Sigcontext *r;
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        uintptr *sp;
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        SigTab *t;
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        uc = context;
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        mc = &uc->uc_mcontext;
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        r = (Sigcontext*)mc;    // same layout, more conveient names
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        if(sig == SIGPROF) {
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                runtime·sigprof((uint8*)r->rip, (uint8*)r->rsp, 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)[2];
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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;
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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->rip);
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        runtime·printf("\n");
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        if(runtime·gotraceback()){
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                runtime·traceback((void*)r->rip, (void*)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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        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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{
120
 
        Sigaltstack st;
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122
 
        st.ss_sp = 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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133
 
        runtime·memclr((byte*)&sa, sizeof sa);
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        sa.sa_flags = SA_ONSTACK | SA_SIGINFO | SA_RESTORER;
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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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        sa.sa_restorer = (void*)runtime·sigreturn;
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        if(fn == runtime·sighandler)
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                fn = (void*)runtime·sigtramp;
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        sa.sa_handler = fn;
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        runtime·rt_sigaction(i, &sa, nil, 8);
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}