mirror of
https://github.com/golang/go
synced 2024-10-04 18:31:22 -06:00
21315c3428
Currently fails with: fatal error: runtime: stack split during syscall goroutine 2 [stack split]: _vasop(0x3ac4a0, 0x505f8f00, 0x7a5a8, 0x7, 0x1ed3797f, ...) src/pkg/runtime/vlrt_arm.c:513 fp=0x505f8ecc runtime.semasleep(0xf8475800, 0xd) src/pkg/runtime/os_netbsd.c:97 +0x178 fp=0x505f8efc R=rsc CC=golang-dev https://golang.org/cl/12246043
334 lines
7.8 KiB
C
334 lines
7.8 KiB
C
// Copyright 2011 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 "os_GOOS.h"
|
|
#include "signal_unix.h"
|
|
#include "stack.h"
|
|
|
|
enum
|
|
{
|
|
ESRCH = 3,
|
|
ENOTSUP = 91,
|
|
|
|
// From NetBSD's <sys/time.h>
|
|
CLOCK_REALTIME = 0,
|
|
CLOCK_VIRTUAL = 1,
|
|
CLOCK_PROF = 2,
|
|
CLOCK_MONOTONIC = 3
|
|
};
|
|
|
|
extern SigTab runtime·sigtab[];
|
|
|
|
static Sigset sigset_none;
|
|
static Sigset sigset_all = { ~(uint32)0, ~(uint32)0, ~(uint32)0, ~(uint32)0, };
|
|
|
|
extern void runtime·getcontext(UcontextT *context);
|
|
extern int32 runtime·lwp_create(UcontextT *context, uintptr flags, void *lwpid);
|
|
extern void runtime·lwp_mcontext_init(void *mc, void *stack, M *mp, G *gp, void (*fn)(void));
|
|
extern int32 runtime·lwp_park(Timespec *abstime, int32 unpark, void *hint, void *unparkhint);
|
|
extern int32 runtime·lwp_unpark(int32 lwp, void *hint);
|
|
extern int32 runtime·lwp_self(void);
|
|
|
|
// From NetBSD's <sys/sysctl.h>
|
|
#define CTL_HW 6
|
|
#define HW_NCPU 3
|
|
|
|
static int32
|
|
getncpu(void)
|
|
{
|
|
uint32 mib[2];
|
|
uint32 out;
|
|
int32 ret;
|
|
uintptr nout;
|
|
|
|
// Fetch hw.ncpu via sysctl.
|
|
mib[0] = CTL_HW;
|
|
mib[1] = HW_NCPU;
|
|
nout = sizeof out;
|
|
out = 0;
|
|
ret = runtime·sysctl(mib, 2, (byte*)&out, &nout, nil, 0);
|
|
if(ret >= 0)
|
|
return out;
|
|
else
|
|
return 1;
|
|
}
|
|
|
|
uintptr
|
|
runtime·semacreate(void)
|
|
{
|
|
return 1;
|
|
}
|
|
|
|
#pragma textflag 7
|
|
int32
|
|
runtime·semasleep(int64 ns)
|
|
{
|
|
Timespec ts;
|
|
|
|
// spin-mutex lock
|
|
while(runtime·xchg(&m->waitsemalock, 1))
|
|
runtime·osyield();
|
|
|
|
for(;;) {
|
|
// lock held
|
|
if(m->waitsemacount == 0) {
|
|
// sleep until semaphore != 0 or timeout.
|
|
// thrsleep unlocks m->waitsemalock.
|
|
if(ns < 0) {
|
|
// TODO(jsing) - potential deadlock!
|
|
//
|
|
// There is a potential deadlock here since we
|
|
// have to release the waitsemalock mutex
|
|
// before we call lwp_park() to suspend the
|
|
// thread. This allows another thread to
|
|
// release the lock and call lwp_unpark()
|
|
// before the thread is actually suspended.
|
|
// If this occurs the current thread will end
|
|
// up sleeping indefinitely. Unfortunately
|
|
// the NetBSD kernel does not appear to provide
|
|
// a mechanism for unlocking the userspace
|
|
// mutex once the thread is actually parked.
|
|
runtime·atomicstore(&m->waitsemalock, 0);
|
|
runtime·lwp_park(nil, 0, &m->waitsemacount, nil);
|
|
} else {
|
|
ns = ns + runtime·nanotime();
|
|
// NOTE: tv_nsec is int64 on amd64, so this assumes a little-endian system.
|
|
ts.tv_nsec = 0;
|
|
ts.tv_sec = runtime·timediv(ns, 1000000000, (int32*)&ts.tv_nsec);
|
|
// TODO(jsing) - potential deadlock!
|
|
// See above for details.
|
|
runtime·atomicstore(&m->waitsemalock, 0);
|
|
runtime·lwp_park(&ts, 0, &m->waitsemacount, nil);
|
|
}
|
|
// reacquire lock
|
|
while(runtime·xchg(&m->waitsemalock, 1))
|
|
runtime·osyield();
|
|
}
|
|
|
|
// lock held (again)
|
|
if(m->waitsemacount != 0) {
|
|
// semaphore is available.
|
|
m->waitsemacount--;
|
|
// spin-mutex unlock
|
|
runtime·atomicstore(&m->waitsemalock, 0);
|
|
return 0; // semaphore acquired
|
|
}
|
|
|
|
// semaphore not available.
|
|
// if there is a timeout, stop now.
|
|
// otherwise keep trying.
|
|
if(ns >= 0)
|
|
break;
|
|
}
|
|
|
|
// lock held but giving up
|
|
// spin-mutex unlock
|
|
runtime·atomicstore(&m->waitsemalock, 0);
|
|
return -1;
|
|
}
|
|
|
|
void
|
|
runtime·semawakeup(M *mp)
|
|
{
|
|
uint32 ret;
|
|
|
|
// spin-mutex lock
|
|
while(runtime·xchg(&mp->waitsemalock, 1))
|
|
runtime·osyield();
|
|
mp->waitsemacount++;
|
|
// TODO(jsing) - potential deadlock, see semasleep() for details.
|
|
// Confirm that LWP is parked before unparking...
|
|
ret = runtime·lwp_unpark(mp->procid, &mp->waitsemacount);
|
|
if(ret != 0 && ret != ESRCH)
|
|
runtime·printf("thrwakeup addr=%p sem=%d ret=%d\n", &mp->waitsemacount, mp->waitsemacount, ret);
|
|
// spin-mutex unlock
|
|
runtime·atomicstore(&mp->waitsemalock, 0);
|
|
}
|
|
|
|
void
|
|
runtime·newosproc(M *mp, void *stk)
|
|
{
|
|
UcontextT uc;
|
|
int32 ret;
|
|
|
|
if(0) {
|
|
runtime·printf(
|
|
"newosproc stk=%p m=%p g=%p id=%d/%d ostk=%p\n",
|
|
stk, mp, mp->g0, mp->id, (int32)mp->tls[0], &mp);
|
|
}
|
|
|
|
mp->tls[0] = mp->id; // so 386 asm can find it
|
|
|
|
runtime·getcontext(&uc);
|
|
|
|
uc.uc_flags = _UC_SIGMASK | _UC_CPU;
|
|
uc.uc_link = nil;
|
|
uc.uc_sigmask = sigset_all;
|
|
|
|
runtime·lwp_mcontext_init(&uc.uc_mcontext, stk, mp, mp->g0, runtime·mstart);
|
|
|
|
ret = runtime·lwp_create(&uc, 0, &mp->procid);
|
|
|
|
if(ret < 0) {
|
|
runtime·printf("runtime: failed to create new OS thread (have %d already; errno=%d)\n", runtime·mcount() - 1, -ret);
|
|
runtime·throw("runtime.newosproc");
|
|
}
|
|
}
|
|
|
|
void
|
|
runtime·osinit(void)
|
|
{
|
|
runtime·ncpu = getncpu();
|
|
}
|
|
|
|
void
|
|
runtime·get_random_data(byte **rnd, int32 *rnd_len)
|
|
{
|
|
static byte urandom_data[HashRandomBytes];
|
|
int32 fd;
|
|
fd = runtime·open("/dev/urandom", 0 /* O_RDONLY */, 0);
|
|
if(runtime·read(fd, urandom_data, HashRandomBytes) == HashRandomBytes) {
|
|
*rnd = urandom_data;
|
|
*rnd_len = HashRandomBytes;
|
|
} else {
|
|
*rnd = nil;
|
|
*rnd_len = 0;
|
|
}
|
|
runtime·close(fd);
|
|
}
|
|
|
|
void
|
|
runtime·goenvs(void)
|
|
{
|
|
runtime·goenvs_unix();
|
|
}
|
|
|
|
// Called to initialize a new m (including the bootstrap m).
|
|
// Called on the parent thread (main thread in case of bootstrap), can allocate memory.
|
|
void
|
|
runtime·mpreinit(M *mp)
|
|
{
|
|
mp->gsignal = runtime·malg(32*1024);
|
|
}
|
|
|
|
// Called to initialize a new m (including the bootstrap m).
|
|
// Called on the new thread, can not allocate memory.
|
|
void
|
|
runtime·minit(void)
|
|
{
|
|
m->procid = runtime·lwp_self();
|
|
|
|
// Initialize signal handling
|
|
runtime·signalstack((byte*)m->gsignal->stackguard - StackGuard, 32*1024);
|
|
runtime·sigprocmask(SIG_SETMASK, &sigset_none, nil);
|
|
}
|
|
|
|
// Called from dropm to undo the effect of an minit.
|
|
void
|
|
runtime·unminit(void)
|
|
{
|
|
runtime·signalstack(nil, 0);
|
|
}
|
|
|
|
void
|
|
runtime·sigpanic(void)
|
|
{
|
|
switch(g->sig) {
|
|
case SIGBUS:
|
|
if(g->sigcode0 == BUS_ADRERR && g->sigcode1 < 0x1000) {
|
|
if(g->sigpc == 0)
|
|
runtime·panicstring("call of nil func value");
|
|
runtime·panicstring("invalid memory address or nil pointer dereference");
|
|
}
|
|
runtime·printf("unexpected fault address %p\n", g->sigcode1);
|
|
runtime·throw("fault");
|
|
case SIGSEGV:
|
|
if((g->sigcode0 == 0 || g->sigcode0 == SEGV_MAPERR || g->sigcode0 == SEGV_ACCERR) && g->sigcode1 < 0x1000) {
|
|
if(g->sigpc == 0)
|
|
runtime·panicstring("call of nil func value");
|
|
runtime·panicstring("invalid memory address or nil pointer dereference");
|
|
}
|
|
runtime·printf("unexpected fault address %p\n", g->sigcode1);
|
|
runtime·throw("fault");
|
|
case SIGFPE:
|
|
switch(g->sigcode0) {
|
|
case FPE_INTDIV:
|
|
runtime·panicstring("integer divide by zero");
|
|
case FPE_INTOVF:
|
|
runtime·panicstring("integer overflow");
|
|
}
|
|
runtime·panicstring("floating point error");
|
|
}
|
|
runtime·panicstring(runtime·sigtab[g->sig].name);
|
|
}
|
|
|
|
uintptr
|
|
runtime·memlimit(void)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
void
|
|
runtime·setprof(bool on)
|
|
{
|
|
USED(on);
|
|
}
|
|
|
|
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·setsig(int32 i, GoSighandler *fn, bool restart)
|
|
{
|
|
Sigaction sa;
|
|
|
|
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);
|
|
}
|
|
|
|
GoSighandler*
|
|
runtime·getsig(int32 i)
|
|
{
|
|
Sigaction sa;
|
|
|
|
runtime·memclr((byte*)&sa, sizeof sa);
|
|
runtime·sigaction(i, nil, &sa);
|
|
if((void*)sa._sa_u._sa_sigaction == runtime·sigtramp)
|
|
return runtime·sighandler;
|
|
return (void*)sa._sa_u._sa_sigaction;
|
|
}
|
|
|
|
void
|
|
runtime·signalstack(byte *p, int32 n)
|
|
{
|
|
StackT st;
|
|
|
|
st.ss_sp = (void*)p;
|
|
st.ss_size = n;
|
|
st.ss_flags = 0;
|
|
if(p == nil)
|
|
st.ss_flags = SS_DISABLE;
|
|
runtime·sigaltstack(&st, nil);
|
|
}
|