blob: b154ad88725fef92b16673564e8d48b739ee387c [file] [log] [blame]
// 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_GOOS_GOARCH.h"
#include "signals_GOOS.h"
#include "os_GOOS.h"
void
runtime·dumpregs(Sigcontext *r)
{
runtime·printf("eax %x\n", r->eax);
runtime·printf("ebx %x\n", r->ebx);
runtime·printf("ecx %x\n", r->ecx);
runtime·printf("edx %x\n", r->edx);
runtime·printf("edi %x\n", r->edi);
runtime·printf("esi %x\n", r->esi);
runtime·printf("ebp %x\n", r->ebp);
runtime·printf("esp %x\n", r->esp);
runtime·printf("eip %x\n", r->eip);
runtime·printf("eflags %x\n", r->eflags);
runtime·printf("cs %x\n", r->cs);
runtime·printf("fs %x\n", r->fs);
runtime·printf("gs %x\n", r->gs);
}
/*
* This assembler routine takes the args from registers, puts them on the stack,
* and calls sighandler().
*/
extern void runtime·sigtramp(void);
extern void runtime·sigreturn(void); // calls runtime·sigreturn
void
runtime·sighandler(int32 sig, Siginfo *info, void *context, G *gp)
{
Ucontext *uc;
Sigcontext *r;
uintptr *sp;
SigTab *t;
uc = context;
r = &uc->uc_mcontext;
if(sig == SIGPROF) {
runtime·sigprof((uint8*)r->eip, (uint8*)r->esp, nil, gp);
return;
}
t = &runtime·sigtab[sig];
if(info->si_code != SI_USER && (t->flags & SigPanic)) {
if(gp == nil)
goto Throw;
// Make it look like a call to the signal func.
// Have to pass arguments out of band since
// augmenting the stack frame would break
// the unwinding code.
gp->sig = sig;
gp->sigcode0 = info->si_code;
gp->sigcode1 = ((uintptr*)info)[3];
gp->sigpc = r->eip;
// Only push runtime·sigpanic if r->eip != 0.
// If r->eip == 0, probably panicked because of a
// call to a nil func. Not pushing that onto sp will
// make the trace look like a call to runtime·sigpanic instead.
// (Otherwise the trace will end at runtime·sigpanic and we
// won't get to see who faulted.)
if(r->eip != 0) {
sp = (uintptr*)r->esp;
*--sp = r->eip;
r->esp = (uintptr)sp;
}
r->eip = (uintptr)runtime·sigpanic;
return;
}
if(info->si_code == SI_USER || (t->flags & SigNotify))
if(runtime·sigsend(sig))
return;
if(t->flags & SigKill)
runtime·exit(2);
if(!(t->flags & SigThrow))
return;
Throw:
runtime·startpanic();
if(sig < 0 || sig >= NSIG)
runtime·printf("Signal %d\n", sig);
else
runtime·printf("%s\n", runtime·sigtab[sig].name);
runtime·printf("PC=%X\n", r->eip);
runtime·printf("\n");
if(runtime·gotraceback()){
runtime·traceback((void*)r->eip, (void*)r->esp, 0, gp);
runtime·tracebackothers(gp);
runtime·dumpregs(r);
}
runtime·exit(2);
}
void
runtime·signalstack(byte *p, int32 n)
{
Sigaltstack st;
st.ss_sp = p;
st.ss_size = n;
st.ss_flags = 0;
runtime·sigaltstack(&st, nil);
}
void
runtime·setsig(int32 i, void (*fn)(int32, Siginfo*, void*, G*), bool restart)
{
Sigaction sa;
runtime·memclr((byte*)&sa, sizeof sa);
sa.sa_flags = SA_ONSTACK | SA_SIGINFO | SA_RESTORER;
if(restart)
sa.sa_flags |= SA_RESTART;
sa.sa_mask = ~0ULL;
sa.sa_restorer = (void*)runtime·sigreturn;
if(fn == runtime·sighandler)
fn = (void*)runtime·sigtramp;
sa.k_sa_handler = fn;
runtime·rt_sigaction(i, &sa, nil, 8);
}
#define AT_NULL 0
#define AT_SYSINFO 32
extern uint32 runtime·_vdso;
#pragma textflag 7
void
runtime·linux_setup_vdso(int32 argc, void *argv_list)
{
byte **argv = &argv_list;
byte **envp;
uint32 *auxv;
// skip envp to get to ELF auxiliary vector.
for(envp = &argv[argc+1]; *envp != nil; envp++)
;
envp++;
for(auxv=(uint32*)envp; auxv[0] != AT_NULL; auxv += 2) {
if(auxv[0] == AT_SYSINFO) {
runtime·_vdso = auxv[1];
break;
}
}
}