mirror of
https://github.com/golang/go
synced 2024-10-02 18:18:33 -06:00
31ab16f98e
1, IMO, the fatal error "regfree: not a register" from 5g when compiling runtime/debug.go is due to gcc miscompile, it doesn't show up when compiled with -O0. But I still haven't thought of a way to fix this, should all ARM builds be built with -O0? 2, fixed mksysnum_linux.pl, so zsysnum_linux_arm.go no longer needs to be hand-generated. 3, regen all in pkg syscall for Linux/ARM on Debian 6.0 This CL is somewhat big, I'd like to split it if necessary. R=rsc, dave CC=golang-dev https://golang.org/cl/5659044
141 lines
3.7 KiB
C
141 lines
3.7 KiB
C
// 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("trap %x\n", r->trap_no);
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runtime·printf("error %x\n", r->error_code);
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runtime·printf("oldmask %x\n", r->oldmask);
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runtime·printf("r0 %x\n", r->arm_r0);
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runtime·printf("r1 %x\n", r->arm_r1);
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runtime·printf("r2 %x\n", r->arm_r2);
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runtime·printf("r3 %x\n", r->arm_r3);
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runtime·printf("r4 %x\n", r->arm_r4);
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runtime·printf("r5 %x\n", r->arm_r5);
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runtime·printf("r6 %x\n", r->arm_r6);
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runtime·printf("r7 %x\n", r->arm_r7);
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runtime·printf("r8 %x\n", r->arm_r8);
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runtime·printf("r9 %x\n", r->arm_r9);
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runtime·printf("r10 %x\n", r->arm_r10);
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runtime·printf("fp %x\n", r->arm_fp);
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runtime·printf("ip %x\n", r->arm_ip);
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runtime·printf("sp %x\n", r->arm_sp);
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runtime·printf("lr %x\n", r->arm_lr);
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runtime·printf("pc %x\n", r->arm_pc);
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runtime·printf("cpsr %x\n", r->arm_cpsr);
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runtime·printf("fault %x\n", r->fault_address);
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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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Sigcontext *r;
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SigTab *t;
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uc = context;
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r = &uc->uc_mcontext;
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if(sig == SIGPROF) {
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runtime·sigprof((uint8*)r->arm_pc, (uint8*)r->arm_sp, (uint8*)r->arm_lr, 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 = r->fault_address;
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gp->sigpc = r->arm_pc;
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// If this is a leaf function, we do smash LR,
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// but we're not going back there anyway.
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// Don't bother smashing if r->arm_pc is 0,
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// which is probably a call to a nil func: the
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// old link register is more useful in the stack trace.
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if(r->arm_pc != 0)
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r->arm_lr = r->arm_pc;
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r->arm_pc = (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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if(runtime·panicking) // traceback already printed
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runtime·exit(2);
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runtime·panicking = 1;
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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->arm_pc);
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runtime·printf("\n");
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if(runtime·gotraceback()){
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runtime·traceback((void*)r->arm_pc, (void*)r->arm_sp, (void*)r->arm_lr, gp);
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runtime·tracebackothers(gp);
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runtime·printf("\n");
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runtime·dumpregs(r);
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}
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// breakpoint();
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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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{
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Sigaltstack st;
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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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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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}
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