| // Copyright 2009 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. |
| |
| #include "runtime.h" |
| #include "defs.h" |
| #include "signals.h" |
| #include "os.h" |
| |
| void |
| dumpregs(Sigcontext *r) |
| { |
| printf("rax %X\n", r->rax); |
| printf("rbx %X\n", r->rbx); |
| printf("rcx %X\n", r->rcx); |
| printf("rdx %X\n", r->rdx); |
| printf("rdi %X\n", r->rdi); |
| printf("rsi %X\n", r->rsi); |
| printf("rbp %X\n", r->rbp); |
| printf("rsp %X\n", r->rsp); |
| printf("r8 %X\n", r->r8 ); |
| printf("r9 %X\n", r->r9 ); |
| printf("r10 %X\n", r->r10); |
| printf("r11 %X\n", r->r11); |
| printf("r12 %X\n", r->r12); |
| printf("r13 %X\n", r->r13); |
| printf("r14 %X\n", r->r14); |
| printf("r15 %X\n", r->r15); |
| printf("rip %X\n", r->rip); |
| printf("rflags %X\n", r->eflags); |
| printf("cs %X\n", (uint64)r->cs); |
| printf("fs %X\n", (uint64)r->fs); |
| printf("gs %X\n", (uint64)r->gs); |
| } |
| |
| /* |
| * This assembler routine takes the args from registers, puts them on the stack, |
| * and calls sighandler(). |
| */ |
| extern void sigtramp(void); |
| extern void sigignore(void); // just returns |
| extern void sigreturn(void); // calls sigreturn |
| |
| String |
| signame(int32 sig) |
| { |
| if(sig < 0 || sig >= NSIG) |
| return emptystring; |
| return gostring((byte*)sigtab[sig].name); |
| } |
| |
| void |
| sighandler(int32 sig, Siginfo* info, void* context) |
| { |
| Ucontext *uc; |
| Mcontext *mc; |
| Sigcontext *sc; |
| |
| if(sigtab[sig].flags & SigQueue) { |
| if(sigsend(sig) || (sigtab[sig].flags & SigIgnore)) |
| return; |
| exit(2); // SIGINT, SIGTERM, etc |
| } |
| |
| if(panicking) // traceback already printed |
| exit(2); |
| panicking = 1; |
| |
| uc = context; |
| mc = &uc->uc_mcontext; |
| sc = (Sigcontext*)mc; // same layout, more conveient names |
| |
| if(sig < 0 || sig >= NSIG) |
| printf("Signal %d\n", sig); |
| else |
| printf("%s\n", sigtab[sig].name); |
| |
| printf("Faulting address: %p\n", *(void**)info->_sifields); |
| printf("PC=%X\n", sc->rip); |
| printf("\n"); |
| |
| if(gotraceback()){ |
| traceback((void*)sc->rip, (void*)sc->rsp, (void*)sc->r15); |
| tracebackothers((void*)sc->r15); |
| dumpregs(sc); |
| } |
| |
| breakpoint(); |
| exit(2); |
| } |
| |
| void |
| signalstack(byte *p, int32 n) |
| { |
| Sigaltstack st; |
| |
| st.ss_sp = p; |
| st.ss_size = n; |
| st.ss_flags = 0; |
| sigaltstack(&st, nil); |
| } |
| |
| void |
| initsig(void) |
| { |
| static Sigaction sa; |
| |
| siginit(); |
| |
| int32 i; |
| sa.sa_flags = SA_ONSTACK | SA_SIGINFO | SA_RESTORER; |
| sa.sa_mask = 0xFFFFFFFFFFFFFFFFULL; |
| sa.sa_restorer = (void*)sigreturn; |
| for(i = 0; i<NSIG; i++) { |
| if(sigtab[i].flags) { |
| if(sigtab[i].flags & (SigCatch | SigQueue)) |
| sa.sa_handler = (void*)sigtramp; |
| else |
| sa.sa_handler = (void*)sigignore; |
| if(sigtab[i].flags & SigRestart) |
| sa.sa_flags |= SA_RESTART; |
| else |
| sa.sa_flags &= ~SA_RESTART; |
| rt_sigaction(i, &sa, nil, 8); |
| } |
| } |
| } |