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// Copyright 2013 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"
#define r0 __gregs[0]
#define r1 __gregs[1]
#define r2 __gregs[2]
#define r3 __gregs[3]
#define r4 __gregs[4]
#define r5 __gregs[5]
#define r6 __gregs[6]
#define r7 __gregs[7]
#define r8 __gregs[8]
#define r9 __gregs[9]
#define r10 __gregs[10]
#define r11 __gregs[11]
#define r12 __gregs[12]
#define r13 __gregs[13]
#define r14 __gregs[14]
#define r15 __gregs[15]
#define cpsr __gregs[16]
void
runtime·dumpregs(McontextT *r)
{
runtime·printf("r0 %x\n", r->r0);
runtime·printf("r1 %x\n", r->r1);
runtime·printf("r2 %x\n", r->r2);
runtime·printf("r3 %x\n", r->r3);
runtime·printf("r4 %x\n", r->r4);
runtime·printf("r5 %x\n", r->r5);
runtime·printf("r6 %x\n", r->r6);
runtime·printf("r7 %x\n", r->r7);
runtime·printf("r8 %x\n", r->r8);
runtime·printf("r9 %x\n", r->r9);
runtime·printf("r10 %x\n", r->r10);
runtime·printf("fp %x\n", r->r11);
runtime·printf("ip %x\n", r->r12);
runtime·printf("sp %x\n", r->r13);
runtime·printf("lr %x\n", r->r14);
runtime·printf("pc %x\n", r->r15);
runtime·printf("cpsr %x\n", r->cpsr);
}
extern void runtime·lwp_tramp(void);
extern void runtime·sigtramp(void);
typedef struct sigaction {
union {
void (*_sa_handler)(int32);
void (*_sa_sigaction)(int32, Siginfo*, void *);
} _sa_u; /* signal handler */
uint32 sa_mask[4]; /* signal mask to apply */
int32 sa_flags; /* see signal options below */
} Sigaction;
void
runtime·sighandler(int32 sig, Siginfo *info, void *context, G *gp)
{
UcontextT *uc;
McontextT *r;
SigTab *t;
uc = context;
r = &uc->uc_mcontext;
if(sig == SIGPROF) {
runtime·sigprof((uint8*)r->r15, (uint8*)r->r13, (uint8*)r->r14, gp);
return;
}
t = &runtime·sigtab[sig];
if(info->_code != SI_USER && (t->flags & SigPanic)) {
if(gp == nil || gp == m->g0)
goto Throw;
// Make it look like a call to the signal func.
// We have to pass arguments out of band since
// augmenting the stack frame would break
// the unwinding code.
gp->sig = sig;
gp->sigcode0 = info->_code;
gp->sigcode1 = *(uintptr*)&info->_reason[0]; /* _addr */
gp->sigpc = r->r15;
// We arrange lr, and pc to pretend the panicking
// function calls sigpanic directly.
// Always save LR to stack so that panics in leaf
// functions are correctly handled. This smashes
// the stack frame but we're not going back there
// anyway.
r->r13 -= 4;
*(uint32 *)r->r13 = r->r14;
// Don't bother saving PC if it's zero, which is
// probably a call to a nil func: the old link register
// is more useful in the stack trace.
if(r->r15 != 0)
r->r14 = r->r15;
// In case we are panicking from external C code
r->r10 = (uintptr)gp;
r->r9 = (uintptr)m;
r->r15 = (uintptr)runtime·sigpanic;
return;
}
if(info->_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->r15);
if(m->lockedg != nil && m->ncgo > 0 && gp == m->g0) {
runtime·printf("signal arrived during cgo execution\n");
gp = m->lockedg;
}
runtime·printf("\n");
if(runtime·gotraceback()){
runtime·traceback((void*)r->r15, (void*)r->r13, (void*)r->r14, gp);
runtime·tracebackothers(gp);
runtime·printf("\n");
runtime·dumpregs(r);
}
// breakpoint();
runtime·exit(2);
}
void
runtime·signalstack(byte *p, int32 n)
{
Sigaltstack st;
st.ss_sp = (uint8*)p;
st.ss_size = n;
st.ss_flags = 0;
if(p == nil)
st.ss_flags = SS_DISABLE;
runtime·sigaltstack(&st, nil);
}
void
runtime·setsig(int32 i, void (*fn)(int32, Siginfo*, void*, G*), bool restart)
{
Sigaction sa;
// If SIGHUP handler is SIG_IGN, assume running
// under nohup and do not set explicit handler.
if(i == SIGHUP) {
runtime·memclr((byte*)&sa, sizeof sa);
runtime·sigaction(i, nil, &sa);
if(sa._sa_u._sa_sigaction == SIG_IGN)
return;
}
runtime·memclr((byte*)&sa, sizeof sa);
sa.sa_flags = SA_SIGINFO|SA_ONSTACK;
if(restart)
sa.sa_flags |= SA_RESTART;
sa.sa_mask[0] = ~0U;
sa.sa_mask[1] = ~0U;
sa.sa_mask[2] = ~0U;
sa.sa_mask[3] = ~0U;
if (fn == runtime·sighandler)
fn = (void*)runtime·sigtramp;
sa._sa_u._sa_sigaction = (void*)fn;
runtime·sigaction(i, &sa, nil);
}
void
runtime·lwp_mcontext_init(McontextT *mc, void *stack, M *mp, G *gp, void (*fn)(void))
{
mc->r15 = (uint32)runtime·lwp_tramp;
mc->r13 = (uint32)stack;
mc->r0 = (uint32)mp;
mc->r1 = (uint32)gp;
mc->r2 = (uint32)fn;
}
void
runtime·checkgoarm(void)
{
// TODO(minux)
}
#pragma textflag 7
int64
runtime·cputicks() {
// Currently cputicks() is used in blocking profiler and to seed runtime·fastrand1().
// runtime·nanotime() is a poor approximation of CPU ticks that is enough for the profiler.
// TODO: need more entropy to better seed fastrand1.
return runtime·nanotime();
}
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