// 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 (
"runtime/internal/sys"
"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_exit exit "libc.so"
//go:cgo_import_dynamic libc_getcontext getcontext "libc.so"
//go:cgo_import_dynamic libc_kill kill "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_exit libc_exit
//go:linkname libc_getcontext libc_getcontext
//go:linkname libc_kill libc_kill
//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_exit,
libc_getcontext,
libc_kill,
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_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 getPageSize() uintptr {
n := int32(sysconf(__SC_PAGESIZE))
if n <= 0 {
return 0
}
return uintptr(n)
}
func osinit() {
ncpu = getncpu()
if physPageSize == 0 {
physPageSize = getPageSize()
}
}
func tstart_sysvicall(newm *m) uint32
// May run with m.p==nil, so write barriers are not allowed.
//go:nowritebarrier
func newosproc(mp *m) {
var (
attr pthreadattr
oset sigset
tid pthread
ret int32
size uint64
)
if pthread_attr_init(&attr) != 0 {
throw("pthread_attr_init")
}
// Allocate a new 2MB stack.
if pthread_attr_setstack(&attr, 0, 0x200000) != 0 {
throw("pthread_attr_setstack")
}
// Read back the allocated stack.
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")
if ret == -_EAGAIN {
println("runtime: may need to increase max user processes (ulimit -u)")
}
throw("newosproc")
}
}
func exitThread(wait *uint32) {
// We should never reach exitThread on Solaris because we let
// libc clean up threads.
throw("exitThread")
}
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, cannot allocate memory.
func minit() {
asmcgocall(unsafe.Pointer(funcPC(miniterrno)), unsafe.Pointer(&libc____errno))
minitSignals()
}
// Called from dropm to undo the effect of an minit.
func unminit() {
unminitSignals()
}
func sigtramp()
//go:nosplit
//go:nowritebarrierrec
func setsig(i uint32, fn uintptr) {
var sa sigactiont
sa.sa_flags = _SA_SIGINFO | _SA_ONSTACK | _SA_RESTART
sa.sa_mask = sigset_all
if fn == funcPC(sighandler) {
fn = funcPC(sigtramp)
}
*((*uintptr)(unsafe.Pointer(&sa._funcptr))) = fn
sigaction(i, &sa, nil)
}
//go:nosplit
//go:nowritebarrierrec
func setsigstack(i uint32) {
var sa sigactiont
sigaction(i, nil, &sa)
if sa.sa_flags&_SA_ONSTACK != 0 {
return
}
sa.sa_flags |= _SA_ONSTACK
sigaction(i, &sa, nil)
}
//go:nosplit
//go:nowritebarrierrec
func getsig(i uint32) uintptr {
var sa sigactiont
sigaction(i, nil, &sa)
return *((*uintptr)(unsafe.Pointer(&sa._funcptr)))
}
// setSignaltstackSP sets the ss_sp field of a stackt.
//go:nosplit
func setSignalstackSP(s *stackt, sp uintptr) {
*(*uintptr)(unsafe.Pointer(&s.ss_sp)) = sp
}
//go:nosplit
//go:nowritebarrierrec
func sigaddset(mask *sigset, i int) {
mask.__sigbits[(i-1)/32] |= 1 << ((uint32(i) - 1) & 31)
}
func sigdelset(mask *sigset, i int) {
mask.__sigbits[(i-1)/32] &^= 1 << ((uint32(i) - 1) & 31)
}
//go:nosplit
func (c *sigctxt) fixsigcode(sig uint32) {
}
//go:nosplit
func semacreate(mp *m) {
if mp.waitsema != 0 {
return
}
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(unsafe.Pointer(&libc_malloc))
_g_.m.libcall.n = 1
_g_.m.scratch = mscratch{}
_g_.m.scratch.v[0] = unsafe.Sizeof(*sem)
_g_.m.libcall.args = uintptr(unsafe.Pointer(&_g_.m.scratch))
asmcgocall(unsafe.Pointer(&asmsysvicall6x), unsafe.Pointer(&_g_.m.libcall))
sem = (*semt)(unsafe.Pointer(_g_.m.libcall.r1))
if sem_init(sem, 0, 0) != 0 {
throw("sem_init")
}
mp.waitsema = 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
_m_.scratch = mscratch{}
_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(&asmsysvicall6x), 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
_m_.scratch = mscratch{}
_m_.scratch.v[0] = _m_.waitsema
_m_.libcall.args = uintptr(unsafe.Pointer(&_m_.scratch))
asmcgocall(unsafe.Pointer(&asmsysvicall6x), 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, int) {
p, err := doMmap(uintptr(addr), n, uintptr(prot), uintptr(flags), uintptr(fd), uintptr(off))
if p == ^uintptr(0) {
return nil, int(err)
}
return unsafe.Pointer(p), 0
}
//go:nosplit
func doMmap(addr, n, prot, flags, fd, off uintptr) (uintptr, uintptr) {
var libcall libcall
libcall.fn = uintptr(unsafe.Pointer(&libc_mmap))
libcall.n = 6
libcall.args = uintptr(noescape(unsafe.Pointer(&addr)))
asmcgocall(unsafe.Pointer(&asmsysvicall6x), unsafe.Pointer(&libcall))
return libcall.r1, libcall.err
}
//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)(unsafe.Pointer(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)))
}
//go:nosplit
//go:nowritebarrierrec
func raise(sig uint32) /* int32 */ {
sysvicall1(&libc_raise, uintptr(sig))
}
func raiseproc(sig uint32) /* int32 */ {
pid := sysvicall0(&libc_getpid)
sysvicall2(&libc_kill, pid, 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)))
}
//go:nosplit
//go:nowritebarrierrec
func sigaction(sig uint32, act *sigactiont, oact *sigactiont) /* int32 */ {
sysvicall3(&libc_sigaction, uintptr(sig), uintptr(unsafe.Pointer(act)), uintptr(unsafe.Pointer(oact)))
}
//go:nosplit
//go:nowritebarrierrec
func sigaltstack(ss *stackt, oss *stackt) /* int32 */ {
sysvicall2(&libc_sigaltstack, uintptr(unsafe.Pointer(ss)), uintptr(unsafe.Pointer(oss)))
}
//go:nosplit
//go:nowritebarrierrec
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(usec 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()
}
//go:linkname executablePath os.executablePath
var executablePath string
func sysargs(argc int32, argv **byte) {
n := argc + 1
// skip over argv, envp to get to auxv
for argv_index(argv, n) != nil {
n++
}
// skip NULL separator
n++
// now argv+n is auxv
auxv := (*[1 << 28]uintptr)(add(unsafe.Pointer(argv), uintptr(n)*sys.PtrSize))
sysauxv(auxv[:])
}
const (
_AT_NULL = 0 // Terminates the vector
_AT_PAGESZ = 6 // Page size in bytes
_AT_SUN_EXECNAME = 2014 // exec() path name
)
func sysauxv(auxv []uintptr) {
for i := 0; auxv[i] != _AT_NULL; i += 2 {
tag, val := auxv[i], auxv[i+1]
switch tag {
case _AT_PAGESZ:
physPageSize = val
case _AT_SUN_EXECNAME:
executablePath = gostringnocopy((*byte)(unsafe.Pointer(val)))
}
}
}
|
