| // Copyright 2010 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. |
| |
| package runtime |
| |
| import "unsafe" |
| |
| type mOS struct { |
| waitsema int32 // semaphore for parking on locks |
| waitsemacount int32 |
| waitsemalock int32 |
| } |
| |
| func nacl_exception_stack(p uintptr, size int32) int32 |
| func nacl_exception_handler(fn uintptr, arg unsafe.Pointer) int32 |
| func nacl_sem_create(flag int32) int32 |
| func nacl_sem_wait(sem int32) int32 |
| func nacl_sem_post(sem int32) int32 |
| func nacl_mutex_create(flag int32) int32 |
| func nacl_mutex_lock(mutex int32) int32 |
| func nacl_mutex_trylock(mutex int32) int32 |
| func nacl_mutex_unlock(mutex int32) int32 |
| func nacl_cond_create(flag int32) int32 |
| func nacl_cond_wait(cond, n int32) int32 |
| func nacl_cond_signal(cond int32) int32 |
| func nacl_cond_broadcast(cond int32) int32 |
| |
| //go:noescape |
| func nacl_cond_timed_wait_abs(cond, lock int32, ts *timespec) int32 |
| func nacl_thread_create(fn uintptr, stk, tls, xx unsafe.Pointer) int32 |
| |
| //go:noescape |
| func nacl_nanosleep(ts, extra *timespec) int32 |
| func nanotime() int64 |
| func mmap(addr unsafe.Pointer, n uintptr, prot, flags, fd int32, off uint32) (p unsafe.Pointer, err int) |
| func exit(code int32) |
| func osyield() |
| |
| //go:noescape |
| func write(fd uintptr, p unsafe.Pointer, n int32) int32 |
| |
| //go:linkname os_sigpipe os.sigpipe |
| func os_sigpipe() { |
| throw("too many writes on closed pipe") |
| } |
| |
| func dieFromSignal(sig uint32) { |
| exit(2) |
| } |
| |
| func sigpanic() { |
| g := getg() |
| if !canpanic(g) { |
| throw("unexpected signal during runtime execution") |
| } |
| |
| // Native Client only invokes the exception handler for memory faults. |
| g.sig = _SIGSEGV |
| panicmem() |
| } |
| |
| func raiseproc(sig uint32) { |
| } |
| |
| // Stubs so tests can link correctly. These should never be called. |
| func open(name *byte, mode, perm int32) int32 |
| func closefd(fd int32) int32 |
| func read(fd int32, p unsafe.Pointer, n int32) int32 |
| |
| type sigset struct{} |
| |
| // Called to initialize a new m (including the bootstrap m). |
| // Called on the parent thread (main thread in case of bootstrap), can allocate memory. |
| func mpreinit(mp *m) { |
| mp.gsignal = malg(32 * 1024) |
| mp.gsignal.m = mp |
| } |
| |
| func sigtramp() |
| |
| //go:nosplit |
| func msigsave(mp *m) { |
| } |
| |
| //go:nosplit |
| func msigrestore(sigmask sigset) { |
| } |
| |
| //go:nosplit |
| //go:nowritebarrierrec |
| func clearSignalHandlers() { |
| } |
| |
| //go:nosplit |
| func sigblock() { |
| } |
| |
| // Called to initialize a new m (including the bootstrap m). |
| // Called on the new thread, cannot allocate memory. |
| func minit() { |
| _g_ := getg() |
| |
| // Initialize signal handling |
| ret := nacl_exception_stack(_g_.m.gsignal.stack.lo, 32*1024) |
| if ret < 0 { |
| print("runtime: nacl_exception_stack: error ", -ret, "\n") |
| } |
| |
| ret = nacl_exception_handler(funcPC(sigtramp), nil) |
| if ret < 0 { |
| print("runtime: nacl_exception_handler: error ", -ret, "\n") |
| } |
| } |
| |
| // Called from dropm to undo the effect of an minit. |
| func unminit() { |
| } |
| |
| func osinit() { |
| ncpu = 1 |
| getg().m.procid = 2 |
| //nacl_exception_handler(funcPC(sigtramp), nil); |
| physPageSize = 65536 |
| } |
| |
| func signame(sig uint32) string { |
| if sig >= uint32(len(sigtable)) { |
| return "" |
| } |
| return sigtable[sig].name |
| } |
| |
| func crash() { |
| *(*int32)(nil) = 0 |
| } |
| |
| //go:noescape |
| func getRandomData([]byte) |
| |
| func goenvs() { |
| goenvs_unix() |
| } |
| |
| func initsig(preinit bool) { |
| } |
| |
| //go:nosplit |
| func usleep(us uint32) { |
| var ts timespec |
| |
| ts.tv_sec = int64(us / 1e6) |
| ts.tv_nsec = int32(us%1e6) * 1e3 |
| nacl_nanosleep(&ts, nil) |
| } |
| |
| func mstart_nacl() |
| |
| // May run with m.p==nil, so write barriers are not allowed. |
| //go:nowritebarrier |
| func newosproc(mp *m, stk unsafe.Pointer) { |
| mp.tls[0] = uintptr(unsafe.Pointer(mp.g0)) |
| mp.tls[1] = uintptr(unsafe.Pointer(mp)) |
| ret := nacl_thread_create(funcPC(mstart_nacl), stk, unsafe.Pointer(&mp.tls[2]), nil) |
| if ret < 0 { |
| print("nacl_thread_create: error ", -ret, "\n") |
| throw("newosproc") |
| } |
| } |
| |
| //go:noescape |
| func exitThread(wait *uint32) |
| |
| //go:nosplit |
| func semacreate(mp *m) { |
| if mp.waitsema != 0 { |
| return |
| } |
| systemstack(func() { |
| mu := nacl_mutex_create(0) |
| if mu < 0 { |
| print("nacl_mutex_create: error ", -mu, "\n") |
| throw("semacreate") |
| } |
| c := nacl_cond_create(0) |
| if c < 0 { |
| print("nacl_cond_create: error ", -c, "\n") |
| throw("semacreate") |
| } |
| mp.waitsema = c |
| mp.waitsemalock = mu |
| }) |
| } |
| |
| //go:nosplit |
| func semasleep(ns int64) int32 { |
| var ret int32 |
| |
| systemstack(func() { |
| _g_ := getg() |
| if nacl_mutex_lock(_g_.m.waitsemalock) < 0 { |
| throw("semasleep") |
| } |
| |
| for _g_.m.waitsemacount == 0 { |
| if ns < 0 { |
| if nacl_cond_wait(_g_.m.waitsema, _g_.m.waitsemalock) < 0 { |
| throw("semasleep") |
| } |
| } else { |
| var ts timespec |
| end := ns + nanotime() |
| ts.tv_sec = end / 1e9 |
| ts.tv_nsec = int32(end % 1e9) |
| r := nacl_cond_timed_wait_abs(_g_.m.waitsema, _g_.m.waitsemalock, &ts) |
| if r == -_ETIMEDOUT { |
| nacl_mutex_unlock(_g_.m.waitsemalock) |
| ret = -1 |
| return |
| } |
| if r < 0 { |
| throw("semasleep") |
| } |
| } |
| } |
| |
| _g_.m.waitsemacount = 0 |
| nacl_mutex_unlock(_g_.m.waitsemalock) |
| ret = 0 |
| }) |
| return ret |
| } |
| |
| //go:nosplit |
| func semawakeup(mp *m) { |
| systemstack(func() { |
| if nacl_mutex_lock(mp.waitsemalock) < 0 { |
| throw("semawakeup") |
| } |
| if mp.waitsemacount != 0 { |
| throw("semawakeup") |
| } |
| mp.waitsemacount = 1 |
| nacl_cond_signal(mp.waitsema) |
| nacl_mutex_unlock(mp.waitsemalock) |
| }) |
| } |
| |
| // This runs on a foreign stack, without an m or a g. No stack split. |
| //go:nosplit |
| //go:norace |
| //go:nowritebarrierrec |
| func badsignal(sig uintptr) { |
| cgocallback(unsafe.Pointer(funcPC(badsignalgo)), noescape(unsafe.Pointer(&sig)), unsafe.Sizeof(sig), 0) |
| } |
| |
| func badsignalgo(sig uintptr) { |
| if !sigsend(uint32(sig)) { |
| // A foreign thread received the signal sig, and the |
| // Go code does not want to handle it. |
| raisebadsignal(uint32(sig)) |
| } |
| } |
| |
| // This runs on a foreign stack, without an m or a g. No stack split. |
| //go:nosplit |
| func badsignal2() { |
| write(2, unsafe.Pointer(&badsignal1[0]), int32(len(badsignal1))) |
| exit(2) |
| } |
| |
| var badsignal1 = []byte("runtime: signal received on thread not created by Go.\n") |
| |
| func raisebadsignal(sig uint32) { |
| badsignal2() |
| } |
| |
| func madvise(addr unsafe.Pointer, n uintptr, flags int32) {} |
| func munmap(addr unsafe.Pointer, n uintptr) {} |
| func setProcessCPUProfiler(hz int32) {} |
| func setThreadCPUProfiler(hz int32) {} |
| func sigdisable(uint32) {} |
| func sigenable(uint32) {} |
| func sigignore(uint32) {} |
| func closeonexec(int32) {} |
| |
| // gsignalStack is unused on nacl. |
| type gsignalStack struct{} |
| |
| var writelock uint32 // test-and-set spin lock for write |
| |
| // lastfaketime stores the last faketime value written to fd 1 or 2. |
| var lastfaketime int64 |
| |
| // lastfaketimefd stores the fd to which lastfaketime was written. |
| // |
| // Subsequent writes to the same fd may use the same timestamp, |
| // but the timestamp must increase if the fd changes. |
| var lastfaketimefd int32 |
| |
| /* |
| An attempt at IRT. Doesn't work. See end of sys_nacl_amd64.s. |
| |
| void (*nacl_irt_query)(void); |
| |
| int8 nacl_irt_basic_v0_1_str[] = "nacl-irt-basic-0.1"; |
| void *nacl_irt_basic_v0_1[6]; // exit, gettod, clock, nanosleep, sched_yield, sysconf |
| int32 nacl_irt_basic_v0_1_size = sizeof(nacl_irt_basic_v0_1); |
| |
| int8 nacl_irt_memory_v0_3_str[] = "nacl-irt-memory-0.3"; |
| void *nacl_irt_memory_v0_3[3]; // mmap, munmap, mprotect |
| int32 nacl_irt_memory_v0_3_size = sizeof(nacl_irt_memory_v0_3); |
| |
| int8 nacl_irt_thread_v0_1_str[] = "nacl-irt-thread-0.1"; |
| void *nacl_irt_thread_v0_1[3]; // thread_create, thread_exit, thread_nice |
| int32 nacl_irt_thread_v0_1_size = sizeof(nacl_irt_thread_v0_1); |
| */ |