| // 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. |
| |
| package runtime |
| |
| import "unsafe" |
| |
| //go:cgo_export_dynamic runtime.end _end |
| //go:cgo_export_dynamic runtime.etext _etext |
| //go:cgo_export_dynamic runtime.edata _edata |
| |
| //go:cgo_import_dynamic libc____errno ___errno "libc.so" |
| //go:cgo_import_dynamic libc_clock_gettime clock_gettime "libc.so" |
| //go:cgo_import_dynamic libc_close close "libc.so" |
| //go:cgo_import_dynamic libc_exit exit "libc.so" |
| //go:cgo_import_dynamic libc_fstat fstat "libc.so" |
| //go:cgo_import_dynamic libc_getcontext getcontext "libc.so" |
| //go:cgo_import_dynamic libc_getrlimit getrlimit "libc.so" |
| //go:cgo_import_dynamic libc_madvise madvise "libc.so" |
| //go:cgo_import_dynamic libc_malloc malloc "libc.so" |
| //go:cgo_import_dynamic libc_mmap mmap "libc.so" |
| //go:cgo_import_dynamic libc_munmap munmap "libc.so" |
| //go:cgo_import_dynamic libc_open open "libc.so" |
| //go:cgo_import_dynamic libc_pthread_attr_destroy pthread_attr_destroy "libc.so" |
| //go:cgo_import_dynamic libc_pthread_attr_getstack pthread_attr_getstack "libc.so" |
| //go:cgo_import_dynamic libc_pthread_attr_init pthread_attr_init "libc.so" |
| //go:cgo_import_dynamic libc_pthread_attr_setdetachstate pthread_attr_setdetachstate "libc.so" |
| //go:cgo_import_dynamic libc_pthread_attr_setstack pthread_attr_setstack "libc.so" |
| //go:cgo_import_dynamic libc_pthread_create pthread_create "libc.so" |
| //go:cgo_import_dynamic libc_raise raise "libc.so" |
| //go:cgo_import_dynamic libc_read read "libc.so" |
| //go:cgo_import_dynamic libc_select select "libc.so" |
| //go:cgo_import_dynamic libc_sched_yield sched_yield "libc.so" |
| //go:cgo_import_dynamic libc_sem_init sem_init "libc.so" |
| //go:cgo_import_dynamic libc_sem_post sem_post "libc.so" |
| //go:cgo_import_dynamic libc_sem_reltimedwait_np sem_reltimedwait_np "libc.so" |
| //go:cgo_import_dynamic libc_sem_wait sem_wait "libc.so" |
| //go:cgo_import_dynamic libc_setitimer setitimer "libc.so" |
| //go:cgo_import_dynamic libc_sigaction sigaction "libc.so" |
| //go:cgo_import_dynamic libc_sigaltstack sigaltstack "libc.so" |
| //go:cgo_import_dynamic libc_sigprocmask sigprocmask "libc.so" |
| //go:cgo_import_dynamic libc_sysconf sysconf "libc.so" |
| //go:cgo_import_dynamic libc_usleep usleep "libc.so" |
| //go:cgo_import_dynamic libc_write write "libc.so" |
| |
| //go:linkname libc____errno libc____errno |
| //go:linkname libc_clock_gettime libc_clock_gettime |
| //go:linkname libc_close libc_close |
| //go:linkname libc_exit libc_exit |
| //go:linkname libc_fstat libc_fstat |
| //go:linkname libc_getcontext libc_getcontext |
| //go:linkname libc_getrlimit libc_getrlimit |
| //go:linkname libc_madvise libc_madvise |
| //go:linkname libc_malloc libc_malloc |
| //go:linkname libc_mmap libc_mmap |
| //go:linkname libc_munmap libc_munmap |
| //go:linkname libc_open libc_open |
| //go:linkname libc_pthread_attr_destroy libc_pthread_attr_destroy |
| //go:linkname libc_pthread_attr_getstack libc_pthread_attr_getstack |
| //go:linkname libc_pthread_attr_init libc_pthread_attr_init |
| //go:linkname libc_pthread_attr_setdetachstate libc_pthread_attr_setdetachstate |
| //go:linkname libc_pthread_attr_setstack libc_pthread_attr_setstack |
| //go:linkname libc_pthread_create libc_pthread_create |
| //go:linkname libc_raise libc_raise |
| //go:linkname libc_read libc_read |
| //go:linkname libc_select libc_select |
| //go:linkname libc_sched_yield libc_sched_yield |
| //go:linkname libc_sem_init libc_sem_init |
| //go:linkname libc_sem_post libc_sem_post |
| //go:linkname libc_sem_reltimedwait_np libc_sem_reltimedwait_np |
| //go:linkname libc_sem_wait libc_sem_wait |
| //go:linkname libc_setitimer libc_setitimer |
| //go:linkname libc_sigaction libc_sigaction |
| //go:linkname libc_sigaltstack libc_sigaltstack |
| //go:linkname libc_sigprocmask libc_sigprocmask |
| //go:linkname libc_sysconf libc_sysconf |
| //go:linkname libc_usleep libc_usleep |
| //go:linkname libc_write libc_write |
| |
| var ( |
| libc____errno, |
| libc_clock_gettime, |
| libc_close, |
| libc_exit, |
| libc_fstat, |
| libc_getcontext, |
| libc_getrlimit, |
| libc_madvise, |
| libc_malloc, |
| libc_mmap, |
| libc_munmap, |
| libc_open, |
| libc_pthread_attr_destroy, |
| libc_pthread_attr_getstack, |
| libc_pthread_attr_init, |
| libc_pthread_attr_setdetachstate, |
| libc_pthread_attr_setstack, |
| libc_pthread_create, |
| libc_raise, |
| libc_read, |
| libc_sched_yield, |
| libc_select, |
| libc_sem_init, |
| libc_sem_post, |
| libc_sem_reltimedwait_np, |
| libc_sem_wait, |
| libc_setitimer, |
| libc_sigaction, |
| libc_sigaltstack, |
| libc_sigprocmask, |
| libc_sysconf, |
| libc_usleep, |
| libc_write libcFunc |
| ) |
| |
| var sigset_none = sigset{} |
| var sigset_all = sigset{[4]uint32{^uint32(0), ^uint32(0), ^uint32(0), ^uint32(0)}} |
| |
| func getncpu() int32 { |
| n := int32(sysconf(__SC_NPROCESSORS_ONLN)) |
| if n < 1 { |
| return 1 |
| } |
| return n |
| } |
| |
| func osinit() { |
| ncpu = getncpu() |
| } |
| |
| func tstart_sysvicall() |
| |
| // May run with m.p==nil, so write barriers are not allowed. |
| //go:nowritebarrier |
| func newosproc(mp *m, _ unsafe.Pointer) { |
| var ( |
| attr pthreadattr |
| oset sigset |
| tid pthread |
| ret int32 |
| size uint64 |
| ) |
| |
| if pthread_attr_init(&attr) != 0 { |
| throw("pthread_attr_init") |
| } |
| if pthread_attr_setstack(&attr, 0, 0x200000) != 0 { |
| throw("pthread_attr_setstack") |
| } |
| if pthread_attr_getstack(&attr, unsafe.Pointer(&mp.g0.stack.hi), &size) != 0 { |
| throw("pthread_attr_getstack") |
| } |
| mp.g0.stack.lo = mp.g0.stack.hi - uintptr(size) |
| if pthread_attr_setdetachstate(&attr, _PTHREAD_CREATE_DETACHED) != 0 { |
| throw("pthread_attr_setdetachstate") |
| } |
| |
| // Disable signals during create, so that the new thread starts |
| // with signals disabled. It will enable them in minit. |
| sigprocmask(_SIG_SETMASK, &sigset_all, &oset) |
| ret = pthread_create(&tid, &attr, funcPC(tstart_sysvicall), unsafe.Pointer(mp)) |
| sigprocmask(_SIG_SETMASK, &oset, nil) |
| if ret != 0 { |
| print("runtime: failed to create new OS thread (have ", mcount(), " already; errno=", ret, ")\n") |
| throw("newosproc") |
| } |
| } |
| |
| var urandom_dev = []byte("/dev/urandom\x00") |
| |
| //go:nosplit |
| func getRandomData(r []byte) { |
| fd := open(&urandom_dev[0], 0 /* O_RDONLY */, 0) |
| n := read(fd, unsafe.Pointer(&r[0]), int32(len(r))) |
| closefd(fd) |
| extendRandom(r, int(n)) |
| } |
| |
| func goenvs() { |
| 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. |
| func mpreinit(mp *m) { |
| mp.gsignal = malg(32 * 1024) |
| mp.gsignal.m = mp |
| } |
| |
| func miniterrno() |
| |
| // Called to initialize a new m (including the bootstrap m). |
| // Called on the new thread, can not allocate memory. |
| func minit() { |
| _g_ := getg() |
| asmcgocall(unsafe.Pointer(funcPC(miniterrno)), unsafe.Pointer(libc____errno)) |
| // Initialize signal handling |
| signalstack((*byte)(unsafe.Pointer(_g_.m.gsignal.stack.lo)), 32*1024) |
| sigprocmask(_SIG_SETMASK, &sigset_none, nil) |
| } |
| |
| // Called from dropm to undo the effect of an minit. |
| func unminit() { |
| signalstack(nil, 0) |
| } |
| |
| func memlimit() uintptr { |
| /* |
| TODO: Convert to Go when something actually uses the result. |
| Rlimit rl; |
| extern byte runtime·text[], runtime·end[]; |
| uintptr used; |
| |
| if(runtime·getrlimit(RLIMIT_AS, &rl) != 0) |
| return 0; |
| if(rl.rlim_cur >= 0x7fffffff) |
| return 0; |
| |
| // Estimate our VM footprint excluding the heap. |
| // Not an exact science: use size of binary plus |
| // some room for thread stacks. |
| used = runtime·end - runtime·text + (64<<20); |
| if(used >= rl.rlim_cur) |
| return 0; |
| |
| // If there's not at least 16 MB left, we're probably |
| // not going to be able to do much. Treat as no limit. |
| rl.rlim_cur -= used; |
| if(rl.rlim_cur < (16<<20)) |
| return 0; |
| |
| return rl.rlim_cur - used; |
| */ |
| |
| return 0 |
| } |
| |
| func sigtramp() |
| |
| func setsig(i int32, fn uintptr, restart bool) { |
| var sa sigactiont |
| |
| sa.sa_flags = _SA_SIGINFO | _SA_ONSTACK |
| sa.sa_flags = _SA_SIGINFO | _SA_ONSTACK |
| if restart { |
| sa.sa_flags |= _SA_RESTART |
| } |
| sa.sa_mask = sigset_all |
| if fn == funcPC(sighandler) { |
| fn = funcPC(sigtramp) |
| } |
| *((*uintptr)(unsafe.Pointer(&sa._funcptr))) = fn |
| sigaction(i, &sa, nil) |
| } |
| |
| func setsigstack(i int32) { |
| throw("setsigstack") |
| } |
| |
| func getsig(i int32) uintptr { |
| var sa sigactiont |
| sigaction(i, nil, &sa) |
| if *((*uintptr)(unsafe.Pointer(&sa._funcptr))) == funcPC(sigtramp) { |
| return funcPC(sighandler) |
| } |
| return *((*uintptr)(unsafe.Pointer(&sa._funcptr))) |
| } |
| |
| func signalstack(p *byte, n int32) { |
| var st sigaltstackt |
| st.ss_sp = (*byte)(unsafe.Pointer(p)) |
| st.ss_size = uint64(n) |
| st.ss_flags = 0 |
| if p == nil { |
| st.ss_flags = _SS_DISABLE |
| } |
| sigaltstack(&st, nil) |
| } |
| |
| func unblocksignals() { |
| sigprocmask(_SIG_SETMASK, &sigset_none, nil) |
| } |
| |
| //go:nosplit |
| func semacreate() uintptr { |
| var sem *semt |
| _g_ := getg() |
| |
| // Call libc's malloc rather than malloc. This will |
| // allocate space on the C heap. We can't call malloc |
| // here because it could cause a deadlock. |
| _g_.m.libcall.fn = uintptr(libc_malloc) |
| _g_.m.libcall.n = 1 |
| memclr(unsafe.Pointer(&_g_.m.scratch), uintptr(len(_g_.m.scratch.v))) |
| _g_.m.scratch.v[0] = unsafe.Sizeof(*sem) |
| _g_.m.libcall.args = uintptr(unsafe.Pointer(&_g_.m.scratch)) |
| asmcgocall(unsafe.Pointer(&asmsysvicall6), unsafe.Pointer(&_g_.m.libcall)) |
| sem = (*semt)(unsafe.Pointer(_g_.m.libcall.r1)) |
| if sem_init(sem, 0, 0) != 0 { |
| throw("sem_init") |
| } |
| return uintptr(unsafe.Pointer(sem)) |
| } |
| |
| //go:nosplit |
| func semasleep(ns int64) int32 { |
| _m_ := getg().m |
| if ns >= 0 { |
| _m_.ts.tv_sec = ns / 1000000000 |
| _m_.ts.tv_nsec = ns % 1000000000 |
| |
| _m_.libcall.fn = uintptr(unsafe.Pointer(libc_sem_reltimedwait_np)) |
| _m_.libcall.n = 2 |
| memclr(unsafe.Pointer(&_m_.scratch), uintptr(len(_m_.scratch.v))) |
| _m_.scratch.v[0] = _m_.waitsema |
| _m_.scratch.v[1] = uintptr(unsafe.Pointer(&_m_.ts)) |
| _m_.libcall.args = uintptr(unsafe.Pointer(&_m_.scratch)) |
| asmcgocall(unsafe.Pointer(&asmsysvicall6), unsafe.Pointer(&_m_.libcall)) |
| if *_m_.perrno != 0 { |
| if *_m_.perrno == _ETIMEDOUT || *_m_.perrno == _EAGAIN || *_m_.perrno == _EINTR { |
| return -1 |
| } |
| throw("sem_reltimedwait_np") |
| } |
| return 0 |
| } |
| for { |
| _m_.libcall.fn = uintptr(unsafe.Pointer(libc_sem_wait)) |
| _m_.libcall.n = 1 |
| memclr(unsafe.Pointer(&_m_.scratch), uintptr(len(_m_.scratch.v))) |
| _m_.scratch.v[0] = _m_.waitsema |
| _m_.libcall.args = uintptr(unsafe.Pointer(&_m_.scratch)) |
| asmcgocall(unsafe.Pointer(&asmsysvicall6), unsafe.Pointer(&_m_.libcall)) |
| if _m_.libcall.r1 == 0 { |
| break |
| } |
| if *_m_.perrno == _EINTR { |
| continue |
| } |
| throw("sem_wait") |
| } |
| return 0 |
| } |
| |
| //go:nosplit |
| func semawakeup(mp *m) { |
| if sem_post((*semt)(unsafe.Pointer(mp.waitsema))) != 0 { |
| throw("sem_post") |
| } |
| } |
| |
| //go:nosplit |
| func closefd(fd int32) int32 { |
| return int32(sysvicall1(libc_close, uintptr(fd))) |
| } |
| |
| //go:nosplit |
| func exit(r int32) { |
| sysvicall1(libc_exit, uintptr(r)) |
| } |
| |
| //go:nosplit |
| func getcontext(context *ucontext) /* int32 */ { |
| sysvicall1(libc_getcontext, uintptr(unsafe.Pointer(context))) |
| } |
| |
| //go:nosplit |
| func madvise(addr unsafe.Pointer, n uintptr, flags int32) { |
| sysvicall3(libc_madvise, uintptr(addr), uintptr(n), uintptr(flags)) |
| } |
| |
| //go:nosplit |
| func mmap(addr unsafe.Pointer, n uintptr, prot, flags, fd int32, off uint32) unsafe.Pointer { |
| return unsafe.Pointer(sysvicall6(libc_mmap, uintptr(addr), uintptr(n), uintptr(prot), uintptr(flags), uintptr(fd), uintptr(off))) |
| } |
| |
| //go:nosplit |
| func munmap(addr unsafe.Pointer, n uintptr) { |
| sysvicall2(libc_munmap, uintptr(addr), uintptr(n)) |
| } |
| |
| func nanotime1() |
| |
| //go:nosplit |
| func nanotime() int64 { |
| return int64(sysvicall0(libcFunc(funcPC(nanotime1)))) |
| } |
| |
| //go:nosplit |
| func open(path *byte, mode, perm int32) int32 { |
| return int32(sysvicall3(libc_open, uintptr(unsafe.Pointer(path)), uintptr(mode), uintptr(perm))) |
| } |
| |
| func pthread_attr_destroy(attr *pthreadattr) int32 { |
| return int32(sysvicall1(libc_pthread_attr_destroy, uintptr(unsafe.Pointer(attr)))) |
| } |
| |
| func pthread_attr_getstack(attr *pthreadattr, addr unsafe.Pointer, size *uint64) int32 { |
| return int32(sysvicall3(libc_pthread_attr_getstack, uintptr(unsafe.Pointer(attr)), uintptr(addr), uintptr(unsafe.Pointer(size)))) |
| } |
| |
| func pthread_attr_init(attr *pthreadattr) int32 { |
| return int32(sysvicall1(libc_pthread_attr_init, uintptr(unsafe.Pointer(attr)))) |
| } |
| |
| func pthread_attr_setdetachstate(attr *pthreadattr, state int32) int32 { |
| return int32(sysvicall2(libc_pthread_attr_setdetachstate, uintptr(unsafe.Pointer(attr)), uintptr(state))) |
| } |
| |
| func pthread_attr_setstack(attr *pthreadattr, addr uintptr, size uint64) int32 { |
| return int32(sysvicall3(libc_pthread_attr_setstack, uintptr(unsafe.Pointer(attr)), uintptr(addr), uintptr(size))) |
| } |
| |
| func pthread_create(thread *pthread, attr *pthreadattr, fn uintptr, arg unsafe.Pointer) int32 { |
| return int32(sysvicall4(libc_pthread_create, uintptr(unsafe.Pointer(thread)), uintptr(unsafe.Pointer(attr)), uintptr(fn), uintptr(arg))) |
| } |
| |
| func raise(sig int32) /* int32 */ { |
| sysvicall1(libc_raise, uintptr(sig)) |
| } |
| |
| func raiseproc(sig int32) /* int32 */ { |
| sysvicall1(libc_raise, uintptr(sig)) |
| } |
| |
| //go:nosplit |
| func read(fd int32, buf unsafe.Pointer, nbyte int32) int32 { |
| return int32(sysvicall3(libc_read, uintptr(fd), uintptr(buf), uintptr(nbyte))) |
| } |
| |
| //go:nosplit |
| func sem_init(sem *semt, pshared int32, value uint32) int32 { |
| return int32(sysvicall3(libc_sem_init, uintptr(unsafe.Pointer(sem)), uintptr(pshared), uintptr(value))) |
| } |
| |
| //go:nosplit |
| func sem_post(sem *semt) int32 { |
| return int32(sysvicall1(libc_sem_post, uintptr(unsafe.Pointer(sem)))) |
| } |
| |
| //go:nosplit |
| func sem_reltimedwait_np(sem *semt, timeout *timespec) int32 { |
| return int32(sysvicall2(libc_sem_reltimedwait_np, uintptr(unsafe.Pointer(sem)), uintptr(unsafe.Pointer(timeout)))) |
| } |
| |
| //go:nosplit |
| func sem_wait(sem *semt) int32 { |
| return int32(sysvicall1(libc_sem_wait, uintptr(unsafe.Pointer(sem)))) |
| } |
| |
| func setitimer(which int32, value *itimerval, ovalue *itimerval) /* int32 */ { |
| sysvicall3(libc_setitimer, uintptr(which), uintptr(unsafe.Pointer(value)), uintptr(unsafe.Pointer(ovalue))) |
| } |
| |
| func sigaction(sig int32, act *sigactiont, oact *sigactiont) /* int32 */ { |
| sysvicall3(libc_sigaction, uintptr(sig), uintptr(unsafe.Pointer(act)), uintptr(unsafe.Pointer(oact))) |
| } |
| |
| func sigaltstack(ss *sigaltstackt, oss *sigaltstackt) /* int32 */ { |
| sysvicall2(libc_sigaltstack, uintptr(unsafe.Pointer(ss)), uintptr(unsafe.Pointer(oss))) |
| } |
| |
| func sigprocmask(how int32, set *sigset, oset *sigset) /* int32 */ { |
| sysvicall3(libc_sigprocmask, uintptr(how), uintptr(unsafe.Pointer(set)), uintptr(unsafe.Pointer(oset))) |
| } |
| |
| func sysconf(name int32) int64 { |
| return int64(sysvicall1(libc_sysconf, uintptr(name))) |
| } |
| |
| func usleep1(uint32) |
| |
| //go:nosplit |
| func usleep(µs uint32) { |
| usleep1(µs) |
| } |
| |
| //go:nosplit |
| func write(fd uintptr, buf unsafe.Pointer, nbyte int32) int32 { |
| return int32(sysvicall3(libc_write, uintptr(fd), uintptr(buf), uintptr(nbyte))) |
| } |
| |
| func osyield1() |
| |
| //go:nosplit |
| func osyield() { |
| _g_ := getg() |
| |
| // Check the validity of m because we might be called in cgo callback |
| // path early enough where there isn't a m available yet. |
| if _g_ != nil && _g_.m != nil { |
| sysvicall0(libc_sched_yield) |
| return |
| } |
| osyield1() |
| } |
