2009-12-15 19:21:29 -07:00
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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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2009-11-17 09:20:58 -07:00
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#include "runtime.h"
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#include "defs.h"
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#include "signals.h"
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#include "os.h"
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extern void 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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2009-11-20 14:08:16 -07:00
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dumpregs(Mcontext *r)
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{
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printf("rax %X\n", r->mc_rax);
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printf("rbx %X\n", r->mc_rbx);
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printf("rcx %X\n", r->mc_rcx);
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printf("rdx %X\n", r->mc_rdx);
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printf("rdi %X\n", r->mc_rdi);
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printf("rsi %X\n", r->mc_rsi);
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printf("rbp %X\n", r->mc_rbp);
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printf("rsp %X\n", r->mc_rsp);
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printf("r8 %X\n", r->mc_r8 );
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printf("r9 %X\n", r->mc_r9 );
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printf("r10 %X\n", r->mc_r10);
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printf("r11 %X\n", r->mc_r11);
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printf("r12 %X\n", r->mc_r12);
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printf("r13 %X\n", r->mc_r13);
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printf("r14 %X\n", r->mc_r14);
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printf("r15 %X\n", r->mc_r15);
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printf("rip %X\n", r->mc_rip);
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printf("rflags %X\n", r->mc_flags);
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printf("cs %X\n", r->mc_cs);
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printf("fs %X\n", r->mc_fs);
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printf("gs %X\n", r->mc_gs);
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}
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2009-12-15 19:21:29 -07:00
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String
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signame(int32 sig)
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{
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if(sig < 0 || sig >= NSIG)
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return emptystring;
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return gostring((byte*)sigtab[sig].name);
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}
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void
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sighandler(int32 sig, Siginfo* info, void* context)
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{
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Ucontext *uc;
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Mcontext *mc;
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2009-12-15 19:21:29 -07:00
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if(sigtab[sig].flags & SigQueue) {
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sigsend(sig);
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return;
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}
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2009-11-17 09:20:58 -07:00
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if(panicking) // traceback already printed
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exit(2);
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panicking = 1;
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uc = context;
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mc = &uc->uc_mcontext;
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if(sig < 0 || sig >= NSIG)
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printf("Signal %d\n", sig);
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else
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printf("%s\n", sigtab[sig].name);
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printf("Faulting address: %p\n", info->si_addr);
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printf("PC=%X\n", mc->mc_rip);
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printf("\n");
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if(gotraceback()){
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traceback((void*)mc->mc_rip, (void*)mc->mc_rsp, (void*)mc->mc_r15);
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tracebackothers((void*)mc->mc_r15);
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dumpregs(mc);
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}
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breakpoint();
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exit(2);
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}
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void
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sigignore(void)
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{
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}
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void
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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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sigaltstack(&st, nil);
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}
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void
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initsig(void)
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{
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static Sigaction sa;
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siginit();
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2009-11-17 09:20:58 -07:00
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int32 i;
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sa.sa_flags |= SA_ONSTACK | SA_SIGINFO;
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sa.sa_mask = ~0x0ull;
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for(i = 0; i < NSIG; i++) {
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if(sigtab[i].flags) {
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if(sigtab[i].flags & (SigCatch | SigQueue))
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sa.__sigaction_u.__sa_sigaction = (void*) sigtramp;
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else
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sa.__sigaction_u.__sa_sigaction = (void*) sigignore;
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2009-11-17 09:20:58 -07:00
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if(sigtab[i].flags & SigRestart)
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sa.sa_flags |= SA_RESTART;
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else
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sa.sa_flags &= ~SA_RESTART;
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sigaction(i, &sa, nil);
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}
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}
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}
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