os3_solaris.go

     1  // Copyright 2011 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  package runtime
     6  
     7  import (
     8  	"internal/abi"
     9  	"internal/goarch"
    10  	"runtime/internal/atomic"
    11  	"unsafe"
    12  )
    13  
    14  //go:cgo_export_dynamic runtime.end _end
    15  //go:cgo_export_dynamic runtime.etext _etext
    16  //go:cgo_export_dynamic runtime.edata _edata
    17  
    18  //go:cgo_import_dynamic libc____errno ___errno "libc.so"
    19  //go:cgo_import_dynamic libc_clock_gettime clock_gettime "libc.so"
    20  //go:cgo_import_dynamic libc_exit exit "libc.so"
    21  //go:cgo_import_dynamic libc_getcontext getcontext "libc.so"
    22  //go:cgo_import_dynamic libc_kill kill "libc.so"
    23  //go:cgo_import_dynamic libc_madvise madvise "libc.so"
    24  //go:cgo_import_dynamic libc_malloc malloc "libc.so"
    25  //go:cgo_import_dynamic libc_mmap mmap "libc.so"
    26  //go:cgo_import_dynamic libc_munmap munmap "libc.so"
    27  //go:cgo_import_dynamic libc_open open "libc.so"
    28  //go:cgo_import_dynamic libc_pthread_attr_destroy pthread_attr_destroy "libc.so"
    29  //go:cgo_import_dynamic libc_pthread_attr_getstack pthread_attr_getstack "libc.so"
    30  //go:cgo_import_dynamic libc_pthread_attr_init pthread_attr_init "libc.so"
    31  //go:cgo_import_dynamic libc_pthread_attr_setdetachstate pthread_attr_setdetachstate "libc.so"
    32  //go:cgo_import_dynamic libc_pthread_attr_setstack pthread_attr_setstack "libc.so"
    33  //go:cgo_import_dynamic libc_pthread_create pthread_create "libc.so"
    34  //go:cgo_import_dynamic libc_pthread_self pthread_self "libc.so"
    35  //go:cgo_import_dynamic libc_pthread_kill pthread_kill "libc.so"
    36  //go:cgo_import_dynamic libc_raise raise "libc.so"
    37  //go:cgo_import_dynamic libc_read read "libc.so"
    38  //go:cgo_import_dynamic libc_select select "libc.so"
    39  //go:cgo_import_dynamic libc_sched_yield sched_yield "libc.so"
    40  //go:cgo_import_dynamic libc_sem_init sem_init "libc.so"
    41  //go:cgo_import_dynamic libc_sem_post sem_post "libc.so"
    42  //go:cgo_import_dynamic libc_sem_reltimedwait_np sem_reltimedwait_np "libc.so"
    43  //go:cgo_import_dynamic libc_sem_wait sem_wait "libc.so"
    44  //go:cgo_import_dynamic libc_setitimer setitimer "libc.so"
    45  //go:cgo_import_dynamic libc_sigaction sigaction "libc.so"
    46  //go:cgo_import_dynamic libc_sigaltstack sigaltstack "libc.so"
    47  //go:cgo_import_dynamic libc_sigprocmask sigprocmask "libc.so"
    48  //go:cgo_import_dynamic libc_sysconf sysconf "libc.so"
    49  //go:cgo_import_dynamic libc_usleep usleep "libc.so"
    50  //go:cgo_import_dynamic libc_write write "libc.so"
    51  //go:cgo_import_dynamic libc_pipe2 pipe2 "libc.so"
    52  
    53  //go:linkname libc____errno libc____errno
    54  //go:linkname libc_clock_gettime libc_clock_gettime
    55  //go:linkname libc_exit libc_exit
    56  //go:linkname libc_getcontext libc_getcontext
    57  //go:linkname libc_kill libc_kill
    58  //go:linkname libc_madvise libc_madvise
    59  //go:linkname libc_malloc libc_malloc
    60  //go:linkname libc_mmap libc_mmap
    61  //go:linkname libc_munmap libc_munmap
    62  //go:linkname libc_open libc_open
    63  //go:linkname libc_pthread_attr_destroy libc_pthread_attr_destroy
    64  //go:linkname libc_pthread_attr_getstack libc_pthread_attr_getstack
    65  //go:linkname libc_pthread_attr_init libc_pthread_attr_init
    66  //go:linkname libc_pthread_attr_setdetachstate libc_pthread_attr_setdetachstate
    67  //go:linkname libc_pthread_attr_setstack libc_pthread_attr_setstack
    68  //go:linkname libc_pthread_create libc_pthread_create
    69  //go:linkname libc_pthread_self libc_pthread_self
    70  //go:linkname libc_pthread_kill libc_pthread_kill
    71  //go:linkname libc_raise libc_raise
    72  //go:linkname libc_read libc_read
    73  //go:linkname libc_select libc_select
    74  //go:linkname libc_sched_yield libc_sched_yield
    75  //go:linkname libc_sem_init libc_sem_init
    76  //go:linkname libc_sem_post libc_sem_post
    77  //go:linkname libc_sem_reltimedwait_np libc_sem_reltimedwait_np
    78  //go:linkname libc_sem_wait libc_sem_wait
    79  //go:linkname libc_setitimer libc_setitimer
    80  //go:linkname libc_sigaction libc_sigaction
    81  //go:linkname libc_sigaltstack libc_sigaltstack
    82  //go:linkname libc_sigprocmask libc_sigprocmask
    83  //go:linkname libc_sysconf libc_sysconf
    84  //go:linkname libc_usleep libc_usleep
    85  //go:linkname libc_write libc_write
    86  //go:linkname libc_pipe2 libc_pipe2
    87  
    88  var (
    89  	libc____errno,
    90  	libc_clock_gettime,
    91  	libc_exit,
    92  	libc_getcontext,
    93  	libc_kill,
    94  	libc_madvise,
    95  	libc_malloc,
    96  	libc_mmap,
    97  	libc_munmap,
    98  	libc_open,
    99  	libc_pthread_attr_destroy,
   100  	libc_pthread_attr_getstack,
   101  	libc_pthread_attr_init,
   102  	libc_pthread_attr_setdetachstate,
   103  	libc_pthread_attr_setstack,
   104  	libc_pthread_create,
   105  	libc_pthread_self,
   106  	libc_pthread_kill,
   107  	libc_raise,
   108  	libc_read,
   109  	libc_sched_yield,
   110  	libc_select,
   111  	libc_sem_init,
   112  	libc_sem_post,
   113  	libc_sem_reltimedwait_np,
   114  	libc_sem_wait,
   115  	libc_setitimer,
   116  	libc_sigaction,
   117  	libc_sigaltstack,
   118  	libc_sigprocmask,
   119  	libc_sysconf,
   120  	libc_usleep,
   121  	libc_write,
   122  	libc_pipe2 libcFunc
   123  )
   124  
   125  var sigset_all = sigset{[4]uint32{^uint32(0), ^uint32(0), ^uint32(0), ^uint32(0)}}
   126  
   127  func getPageSize() uintptr {
   128  	n := int32(sysconf(__SC_PAGESIZE))
   129  	if n <= 0 {
   130  		return 0
   131  	}
   132  	return uintptr(n)
   133  }
   134  
   135  func osinit() {
   136  	ncpu = getncpu()
   137  	if physPageSize == 0 {
   138  		physPageSize = getPageSize()
   139  	}
   140  }
   141  
   142  func tstart_sysvicall(newm *m) uint32
   143  
   144  // May run with m.p==nil, so write barriers are not allowed.
   145  //
   146  //go:nowritebarrier
   147  func newosproc(mp *m) {
   148  	var (
   149  		attr pthreadattr
   150  		oset sigset
   151  		tid  pthread
   152  		ret  int32
   153  		size uint64
   154  	)
   155  
   156  	if pthread_attr_init(&attr) != 0 {
   157  		throw("pthread_attr_init")
   158  	}
   159  	// Allocate a new 2MB stack.
   160  	if pthread_attr_setstack(&attr, 0, 0x200000) != 0 {
   161  		throw("pthread_attr_setstack")
   162  	}
   163  	// Read back the allocated stack.
   164  	if pthread_attr_getstack(&attr, unsafe.Pointer(&mp.g0.stack.hi), &size) != 0 {
   165  		throw("pthread_attr_getstack")
   166  	}
   167  	mp.g0.stack.lo = mp.g0.stack.hi - uintptr(size)
   168  	if pthread_attr_setdetachstate(&attr, _PTHREAD_CREATE_DETACHED) != 0 {
   169  		throw("pthread_attr_setdetachstate")
   170  	}
   171  
   172  	// Disable signals during create, so that the new thread starts
   173  	// with signals disabled. It will enable them in minit.
   174  	sigprocmask(_SIG_SETMASK, &sigset_all, &oset)
   175  	ret = retryOnEAGAIN(func() int32 {
   176  		return pthread_create(&tid, &attr, abi.FuncPCABI0(tstart_sysvicall), unsafe.Pointer(mp))
   177  	})
   178  	sigprocmask(_SIG_SETMASK, &oset, nil)
   179  	if ret != 0 {
   180  		print("runtime: failed to create new OS thread (have ", mcount(), " already; errno=", ret, ")\n")
   181  		if ret == _EAGAIN {
   182  			println("runtime: may need to increase max user processes (ulimit -u)")
   183  		}
   184  		throw("newosproc")
   185  	}
   186  }
   187  
   188  func exitThread(wait *atomic.Uint32) {
   189  	// We should never reach exitThread on Solaris because we let
   190  	// libc clean up threads.
   191  	throw("exitThread")
   192  }
   193  
   194  var urandom_dev = []byte("/dev/urandom\x00")
   195  
   196  //go:nosplit
   197  func getRandomData(r []byte) {
   198  	fd := open(&urandom_dev[0], 0 /* O_RDONLY */, 0)
   199  	n := read(fd, unsafe.Pointer(&r[0]), int32(len(r)))
   200  	closefd(fd)
   201  	extendRandom(r, int(n))
   202  }
   203  
   204  func goenvs() {
   205  	goenvs_unix()
   206  }
   207  
   208  // Called to initialize a new m (including the bootstrap m).
   209  // Called on the parent thread (main thread in case of bootstrap), can allocate memory.
   210  func mpreinit(mp *m) {
   211  	mp.gsignal = malg(32 * 1024)
   212  	mp.gsignal.m = mp
   213  }
   214  
   215  func miniterrno()
   216  
   217  // Called to initialize a new m (including the bootstrap m).
   218  // Called on the new thread, cannot allocate memory.
   219  func minit() {
   220  	asmcgocall(unsafe.Pointer(abi.FuncPCABI0(miniterrno)), unsafe.Pointer(&libc____errno))
   221  
   222  	minitSignals()
   223  
   224  	getg().m.procid = uint64(pthread_self())
   225  }
   226  
   227  // Called from dropm to undo the effect of an minit.
   228  func unminit() {
   229  	unminitSignals()
   230  }
   231  
   232  // Called from exitm, but not from drop, to undo the effect of thread-owned
   233  // resources in minit, semacreate, or elsewhere. Do not take locks after calling this.
   234  func mdestroy(mp *m) {
   235  }
   236  
   237  func sigtramp()
   238  
   239  //go:nosplit
   240  //go:nowritebarrierrec
   241  func setsig(i uint32, fn uintptr) {
   242  	var sa sigactiont
   243  
   244  	sa.sa_flags = _SA_SIGINFO | _SA_ONSTACK | _SA_RESTART
   245  	sa.sa_mask = sigset_all
   246  	if fn == abi.FuncPCABIInternal(sighandler) { // abi.FuncPCABIInternal(sighandler) matches the callers in signal_unix.go
   247  		fn = abi.FuncPCABI0(sigtramp)
   248  	}
   249  	*((*uintptr)(unsafe.Pointer(&sa._funcptr))) = fn
   250  	sigaction(i, &sa, nil)
   251  }
   252  
   253  //go:nosplit
   254  //go:nowritebarrierrec
   255  func setsigstack(i uint32) {
   256  	var sa sigactiont
   257  	sigaction(i, nil, &sa)
   258  	if sa.sa_flags&_SA_ONSTACK != 0 {
   259  		return
   260  	}
   261  	sa.sa_flags |= _SA_ONSTACK
   262  	sigaction(i, &sa, nil)
   263  }
   264  
   265  //go:nosplit
   266  //go:nowritebarrierrec
   267  func getsig(i uint32) uintptr {
   268  	var sa sigactiont
   269  	sigaction(i, nil, &sa)
   270  	return *((*uintptr)(unsafe.Pointer(&sa._funcptr)))
   271  }
   272  
   273  // setSignalstackSP sets the ss_sp field of a stackt.
   274  //
   275  //go:nosplit
   276  func setSignalstackSP(s *stackt, sp uintptr) {
   277  	*(*uintptr)(unsafe.Pointer(&s.ss_sp)) = sp
   278  }
   279  
   280  //go:nosplit
   281  //go:nowritebarrierrec
   282  func sigaddset(mask *sigset, i int) {
   283  	mask.__sigbits[(i-1)/32] |= 1 << ((uint32(i) - 1) & 31)
   284  }
   285  
   286  func sigdelset(mask *sigset, i int) {
   287  	mask.__sigbits[(i-1)/32] &^= 1 << ((uint32(i) - 1) & 31)
   288  }
   289  
   290  //go:nosplit
   291  func (c *sigctxt) fixsigcode(sig uint32) {
   292  }
   293  
   294  func setProcessCPUProfiler(hz int32) {
   295  	setProcessCPUProfilerTimer(hz)
   296  }
   297  
   298  func setThreadCPUProfiler(hz int32) {
   299  	setThreadCPUProfilerHz(hz)
   300  }
   301  
   302  //go:nosplit
   303  func validSIGPROF(mp *m, c *sigctxt) bool {
   304  	return true
   305  }
   306  
   307  //go:nosplit
   308  func semacreate(mp *m) {
   309  	if mp.waitsema != 0 {
   310  		return
   311  	}
   312  
   313  	var sem *semt
   314  
   315  	// Call libc's malloc rather than malloc. This will
   316  	// allocate space on the C heap. We can't call malloc
   317  	// here because it could cause a deadlock.
   318  	mp.libcall.fn = uintptr(unsafe.Pointer(&libc_malloc))
   319  	mp.libcall.n = 1
   320  	mp.scratch = mscratch{}
   321  	mp.scratch.v[0] = unsafe.Sizeof(*sem)
   322  	mp.libcall.args = uintptr(unsafe.Pointer(&mp.scratch))
   323  	asmcgocall(unsafe.Pointer(&asmsysvicall6x), unsafe.Pointer(&mp.libcall))
   324  	sem = (*semt)(unsafe.Pointer(mp.libcall.r1))
   325  	if sem_init(sem, 0, 0) != 0 {
   326  		throw("sem_init")
   327  	}
   328  	mp.waitsema = uintptr(unsafe.Pointer(sem))
   329  }
   330  
   331  //go:nosplit
   332  func semasleep(ns int64) int32 {
   333  	mp := getg().m
   334  	if ns >= 0 {
   335  		mp.ts.tv_sec = ns / 1000000000
   336  		mp.ts.tv_nsec = ns % 1000000000
   337  
   338  		mp.libcall.fn = uintptr(unsafe.Pointer(&libc_sem_reltimedwait_np))
   339  		mp.libcall.n = 2
   340  		mp.scratch = mscratch{}
   341  		mp.scratch.v[0] = mp.waitsema
   342  		mp.scratch.v[1] = uintptr(unsafe.Pointer(&mp.ts))
   343  		mp.libcall.args = uintptr(unsafe.Pointer(&mp.scratch))
   344  		asmcgocall(unsafe.Pointer(&asmsysvicall6x), unsafe.Pointer(&mp.libcall))
   345  		if *mp.perrno != 0 {
   346  			if *mp.perrno == _ETIMEDOUT || *mp.perrno == _EAGAIN || *mp.perrno == _EINTR {
   347  				return -1
   348  			}
   349  			throw("sem_reltimedwait_np")
   350  		}
   351  		return 0
   352  	}
   353  	for {
   354  		mp.libcall.fn = uintptr(unsafe.Pointer(&libc_sem_wait))
   355  		mp.libcall.n = 1
   356  		mp.scratch = mscratch{}
   357  		mp.scratch.v[0] = mp.waitsema
   358  		mp.libcall.args = uintptr(unsafe.Pointer(&mp.scratch))
   359  		asmcgocall(unsafe.Pointer(&asmsysvicall6x), unsafe.Pointer(&mp.libcall))
   360  		if mp.libcall.r1 == 0 {
   361  			break
   362  		}
   363  		if *mp.perrno == _EINTR {
   364  			continue
   365  		}
   366  		throw("sem_wait")
   367  	}
   368  	return 0
   369  }
   370  
   371  //go:nosplit
   372  func semawakeup(mp *m) {
   373  	if sem_post((*semt)(unsafe.Pointer(mp.waitsema))) != 0 {
   374  		throw("sem_post")
   375  	}
   376  }
   377  
   378  //go:nosplit
   379  func closefd(fd int32) int32 {
   380  	return int32(sysvicall1(&libc_close, uintptr(fd)))
   381  }
   382  
   383  //go:nosplit
   384  func exit(r int32) {
   385  	sysvicall1(&libc_exit, uintptr(r))
   386  }
   387  
   388  //go:nosplit
   389  func getcontext(context *ucontext) /* int32 */ {
   390  	sysvicall1(&libc_getcontext, uintptr(unsafe.Pointer(context)))
   391  }
   392  
   393  //go:nosplit
   394  func madvise(addr unsafe.Pointer, n uintptr, flags int32) {
   395  	sysvicall3(&libc_madvise, uintptr(addr), uintptr(n), uintptr(flags))
   396  }
   397  
   398  //go:nosplit
   399  func mmap(addr unsafe.Pointer, n uintptr, prot, flags, fd int32, off uint32) (unsafe.Pointer, int) {
   400  	p, err := doMmap(uintptr(addr), n, uintptr(prot), uintptr(flags), uintptr(fd), uintptr(off))
   401  	if p == ^uintptr(0) {
   402  		return nil, int(err)
   403  	}
   404  	return unsafe.Pointer(p), 0
   405  }
   406  
   407  //go:nosplit
   408  //go:cgo_unsafe_args
   409  func doMmap(addr, n, prot, flags, fd, off uintptr) (uintptr, uintptr) {
   410  	var libcall libcall
   411  	libcall.fn = uintptr(unsafe.Pointer(&libc_mmap))
   412  	libcall.n = 6
   413  	libcall.args = uintptr(noescape(unsafe.Pointer(&addr)))
   414  	asmcgocall(unsafe.Pointer(&asmsysvicall6x), unsafe.Pointer(&libcall))
   415  	return libcall.r1, libcall.err
   416  }
   417  
   418  //go:nosplit
   419  func munmap(addr unsafe.Pointer, n uintptr) {
   420  	sysvicall2(&libc_munmap, uintptr(addr), uintptr(n))
   421  }
   422  
   423  const (
   424  	_CLOCK_REALTIME  = 3
   425  	_CLOCK_MONOTONIC = 4
   426  )
   427  
   428  //go:nosplit
   429  func nanotime1() int64 {
   430  	var ts mts
   431  	sysvicall2(&libc_clock_gettime, _CLOCK_MONOTONIC, uintptr(unsafe.Pointer(&ts)))
   432  	return ts.tv_sec*1e9 + ts.tv_nsec
   433  }
   434  
   435  //go:nosplit
   436  func open(path *byte, mode, perm int32) int32 {
   437  	return int32(sysvicall3(&libc_open, uintptr(unsafe.Pointer(path)), uintptr(mode), uintptr(perm)))
   438  }
   439  
   440  func pthread_attr_destroy(attr *pthreadattr) int32 {
   441  	return int32(sysvicall1(&libc_pthread_attr_destroy, uintptr(unsafe.Pointer(attr))))
   442  }
   443  
   444  func pthread_attr_getstack(attr *pthreadattr, addr unsafe.Pointer, size *uint64) int32 {
   445  	return int32(sysvicall3(&libc_pthread_attr_getstack, uintptr(unsafe.Pointer(attr)), uintptr(addr), uintptr(unsafe.Pointer(size))))
   446  }
   447  
   448  func pthread_attr_init(attr *pthreadattr) int32 {
   449  	return int32(sysvicall1(&libc_pthread_attr_init, uintptr(unsafe.Pointer(attr))))
   450  }
   451  
   452  func pthread_attr_setdetachstate(attr *pthreadattr, state int32) int32 {
   453  	return int32(sysvicall2(&libc_pthread_attr_setdetachstate, uintptr(unsafe.Pointer(attr)), uintptr(state)))
   454  }
   455  
   456  func pthread_attr_setstack(attr *pthreadattr, addr uintptr, size uint64) int32 {
   457  	return int32(sysvicall3(&libc_pthread_attr_setstack, uintptr(unsafe.Pointer(attr)), uintptr(addr), uintptr(size)))
   458  }
   459  
   460  func pthread_create(thread *pthread, attr *pthreadattr, fn uintptr, arg unsafe.Pointer) int32 {
   461  	return int32(sysvicall4(&libc_pthread_create, uintptr(unsafe.Pointer(thread)), uintptr(unsafe.Pointer(attr)), uintptr(fn), uintptr(arg)))
   462  }
   463  
   464  func pthread_self() pthread {
   465  	return pthread(sysvicall0(&libc_pthread_self))
   466  }
   467  
   468  func signalM(mp *m, sig int) {
   469  	sysvicall2(&libc_pthread_kill, uintptr(pthread(mp.procid)), uintptr(sig))
   470  }
   471  
   472  //go:nosplit
   473  //go:nowritebarrierrec
   474  func raise(sig uint32) /* int32 */ {
   475  	sysvicall1(&libc_raise, uintptr(sig))
   476  }
   477  
   478  func raiseproc(sig uint32) /* int32 */ {
   479  	pid := sysvicall0(&libc_getpid)
   480  	sysvicall2(&libc_kill, pid, uintptr(sig))
   481  }
   482  
   483  //go:nosplit
   484  func read(fd int32, buf unsafe.Pointer, nbyte int32) int32 {
   485  	r1, err := sysvicall3Err(&libc_read, uintptr(fd), uintptr(buf), uintptr(nbyte))
   486  	if c := int32(r1); c >= 0 {
   487  		return c
   488  	}
   489  	return -int32(err)
   490  }
   491  
   492  //go:nosplit
   493  func sem_init(sem *semt, pshared int32, value uint32) int32 {
   494  	return int32(sysvicall3(&libc_sem_init, uintptr(unsafe.Pointer(sem)), uintptr(pshared), uintptr(value)))
   495  }
   496  
   497  //go:nosplit
   498  func sem_post(sem *semt) int32 {
   499  	return int32(sysvicall1(&libc_sem_post, uintptr(unsafe.Pointer(sem))))
   500  }
   501  
   502  //go:nosplit
   503  func sem_reltimedwait_np(sem *semt, timeout *timespec) int32 {
   504  	return int32(sysvicall2(&libc_sem_reltimedwait_np, uintptr(unsafe.Pointer(sem)), uintptr(unsafe.Pointer(timeout))))
   505  }
   506  
   507  //go:nosplit
   508  func sem_wait(sem *semt) int32 {
   509  	return int32(sysvicall1(&libc_sem_wait, uintptr(unsafe.Pointer(sem))))
   510  }
   511  
   512  func setitimer(which int32, value *itimerval, ovalue *itimerval) /* int32 */ {
   513  	sysvicall3(&libc_setitimer, uintptr(which), uintptr(unsafe.Pointer(value)), uintptr(unsafe.Pointer(ovalue)))
   514  }
   515  
   516  //go:nosplit
   517  //go:nowritebarrierrec
   518  func sigaction(sig uint32, act *sigactiont, oact *sigactiont) /* int32 */ {
   519  	sysvicall3(&libc_sigaction, uintptr(sig), uintptr(unsafe.Pointer(act)), uintptr(unsafe.Pointer(oact)))
   520  }
   521  
   522  //go:nosplit
   523  //go:nowritebarrierrec
   524  func sigaltstack(ss *stackt, oss *stackt) /* int32 */ {
   525  	sysvicall2(&libc_sigaltstack, uintptr(unsafe.Pointer(ss)), uintptr(unsafe.Pointer(oss)))
   526  }
   527  
   528  //go:nosplit
   529  //go:nowritebarrierrec
   530  func sigprocmask(how int32, set *sigset, oset *sigset) /* int32 */ {
   531  	sysvicall3(&libc_sigprocmask, uintptr(how), uintptr(unsafe.Pointer(set)), uintptr(unsafe.Pointer(oset)))
   532  }
   533  
   534  func sysconf(name int32) int64 {
   535  	return int64(sysvicall1(&libc_sysconf, uintptr(name)))
   536  }
   537  
   538  func usleep1(usec uint32)
   539  
   540  //go:nosplit
   541  func usleep_no_g(µs uint32) {
   542  	usleep1(µs)
   543  }
   544  
   545  //go:nosplit
   546  func usleep(µs uint32) {
   547  	usleep1(µs)
   548  }
   549  
   550  func walltime() (sec int64, nsec int32) {
   551  	var ts mts
   552  	sysvicall2(&libc_clock_gettime, _CLOCK_REALTIME, uintptr(unsafe.Pointer(&ts)))
   553  	return ts.tv_sec, int32(ts.tv_nsec)
   554  }
   555  
   556  //go:nosplit
   557  func write1(fd uintptr, buf unsafe.Pointer, nbyte int32) int32 {
   558  	r1, err := sysvicall3Err(&libc_write, fd, uintptr(buf), uintptr(nbyte))
   559  	if c := int32(r1); c >= 0 {
   560  		return c
   561  	}
   562  	return -int32(err)
   563  }
   564  
   565  //go:nosplit
   566  func pipe2(flags int32) (r, w int32, errno int32) {
   567  	var p [2]int32
   568  	_, e := sysvicall2Err(&libc_pipe2, uintptr(noescape(unsafe.Pointer(&p))), uintptr(flags))
   569  	return p[0], p[1], int32(e)
   570  }
   571  
   572  //go:nosplit
   573  func closeonexec(fd int32) {
   574  	fcntl(fd, _F_SETFD, _FD_CLOEXEC)
   575  }
   576  
   577  func osyield1()
   578  
   579  //go:nosplit
   580  func osyield_no_g() {
   581  	osyield1()
   582  }
   583  
   584  //go:nosplit
   585  func osyield() {
   586  	sysvicall0(&libc_sched_yield)
   587  }
   588  
   589  //go:linkname executablePath os.executablePath
   590  var executablePath string
   591  
   592  func sysargs(argc int32, argv **byte) {
   593  	n := argc + 1
   594  
   595  	// skip over argv, envp to get to auxv
   596  	for argv_index(argv, n) != nil {
   597  		n++
   598  	}
   599  
   600  	// skip NULL separator
   601  	n++
   602  
   603  	// now argv+n is auxv
   604  	auxv := (*[1 << 28]uintptr)(add(unsafe.Pointer(argv), uintptr(n)*goarch.PtrSize))
   605  	sysauxv(auxv[:])
   606  }
   607  
   608  const (
   609  	_AT_NULL         = 0    // Terminates the vector
   610  	_AT_PAGESZ       = 6    // Page size in bytes
   611  	_AT_SUN_EXECNAME = 2014 // exec() path name
   612  )
   613  
   614  func sysauxv(auxv []uintptr) {
   615  	for i := 0; auxv[i] != _AT_NULL; i += 2 {
   616  		tag, val := auxv[i], auxv[i+1]
   617  		switch tag {
   618  		case _AT_PAGESZ:
   619  			physPageSize = val
   620  		case _AT_SUN_EXECNAME:
   621  			executablePath = gostringnocopy((*byte)(unsafe.Pointer(val)))
   622  		}
   623  	}
   624  }
   625  
   626  // sigPerThreadSyscall is only used on linux, so we assign a bogus signal
   627  // number.
   628  const sigPerThreadSyscall = 1 << 31
   629  
   630  //go:nosplit
   631  func runPerThreadSyscall() {
   632  	throw("runPerThreadSyscall only valid on linux")
   633  }
   634
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