Source file src/runtime/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  	"unsafe"
    11  )
    12  
    13  //go:cgo_export_dynamic runtime.end _end
    14  //go:cgo_export_dynamic runtime.etext _etext
    15  //go:cgo_export_dynamic runtime.edata _edata
    16  
    17  //go:cgo_import_dynamic libc____errno ___errno "libc.so"
    18  //go:cgo_import_dynamic libc_clock_gettime clock_gettime "libc.so"
    19  //go:cgo_import_dynamic libc_exit exit "libc.so"
    20  //go:cgo_import_dynamic libc_getcontext getcontext "libc.so"
    21  //go:cgo_import_dynamic libc_kill kill "libc.so"
    22  //go:cgo_import_dynamic libc_madvise madvise "libc.so"
    23  //go:cgo_import_dynamic libc_malloc malloc "libc.so"
    24  //go:cgo_import_dynamic libc_mmap mmap "libc.so"
    25  //go:cgo_import_dynamic libc_munmap munmap "libc.so"
    26  //go:cgo_import_dynamic libc_open open "libc.so"
    27  //go:cgo_import_dynamic libc_pthread_attr_destroy pthread_attr_destroy "libc.so"
    28  //go:cgo_import_dynamic libc_pthread_attr_getstack pthread_attr_getstack "libc.so"
    29  //go:cgo_import_dynamic libc_pthread_attr_init pthread_attr_init "libc.so"
    30  //go:cgo_import_dynamic libc_pthread_attr_setdetachstate pthread_attr_setdetachstate "libc.so"
    31  //go:cgo_import_dynamic libc_pthread_attr_setstack pthread_attr_setstack "libc.so"
    32  //go:cgo_import_dynamic libc_pthread_create pthread_create "libc.so"
    33  //go:cgo_import_dynamic libc_pthread_self pthread_self "libc.so"
    34  //go:cgo_import_dynamic libc_pthread_kill pthread_kill "libc.so"
    35  //go:cgo_import_dynamic libc_raise raise "libc.so"
    36  //go:cgo_import_dynamic libc_read read "libc.so"
    37  //go:cgo_import_dynamic libc_select select "libc.so"
    38  //go:cgo_import_dynamic libc_sched_yield sched_yield "libc.so"
    39  //go:cgo_import_dynamic libc_sem_init sem_init "libc.so"
    40  //go:cgo_import_dynamic libc_sem_post sem_post "libc.so"
    41  //go:cgo_import_dynamic libc_sem_reltimedwait_np sem_reltimedwait_np "libc.so"
    42  //go:cgo_import_dynamic libc_sem_wait sem_wait "libc.so"
    43  //go:cgo_import_dynamic libc_setitimer setitimer "libc.so"
    44  //go:cgo_import_dynamic libc_sigaction sigaction "libc.so"
    45  //go:cgo_import_dynamic libc_sigaltstack sigaltstack "libc.so"
    46  //go:cgo_import_dynamic libc_sigprocmask sigprocmask "libc.so"
    47  //go:cgo_import_dynamic libc_sysconf sysconf "libc.so"
    48  //go:cgo_import_dynamic libc_usleep usleep "libc.so"
    49  //go:cgo_import_dynamic libc_write write "libc.so"
    50  //go:cgo_import_dynamic libc_pipe pipe "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_pipe libc_pipe
    87  //go:linkname libc_pipe2 libc_pipe2
    88  
    89  var (
    90  	libc____errno,
    91  	libc_clock_gettime,
    92  	libc_exit,
    93  	libc_getcontext,
    94  	libc_kill,
    95  	libc_madvise,
    96  	libc_malloc,
    97  	libc_mmap,
    98  	libc_munmap,
    99  	libc_open,
   100  	libc_pthread_attr_destroy,
   101  	libc_pthread_attr_getstack,
   102  	libc_pthread_attr_init,
   103  	libc_pthread_attr_setdetachstate,
   104  	libc_pthread_attr_setstack,
   105  	libc_pthread_create,
   106  	libc_pthread_self,
   107  	libc_pthread_kill,
   108  	libc_raise,
   109  	libc_read,
   110  	libc_sched_yield,
   111  	libc_select,
   112  	libc_sem_init,
   113  	libc_sem_post,
   114  	libc_sem_reltimedwait_np,
   115  	libc_sem_wait,
   116  	libc_setitimer,
   117  	libc_sigaction,
   118  	libc_sigaltstack,
   119  	libc_sigprocmask,
   120  	libc_sysconf,
   121  	libc_usleep,
   122  	libc_write,
   123  	libc_pipe,
   124  	libc_pipe2 libcFunc
   125  )
   126  
   127  var sigset_all = sigset{[4]uint32{^uint32(0), ^uint32(0), ^uint32(0), ^uint32(0)}}
   128  
   129  func getPageSize() uintptr {
   130  	n := int32(sysconf(__SC_PAGESIZE))
   131  	if n <= 0 {
   132  		return 0
   133  	}
   134  	return uintptr(n)
   135  }
   136  
   137  func osinit() {
   138  	ncpu = getncpu()
   139  	if physPageSize == 0 {
   140  		physPageSize = getPageSize()
   141  	}
   142  }
   143  
   144  func tstart_sysvicall(newm *m) uint32
   145  
   146  // May run with m.p==nil, so write barriers are not allowed.
   147  //go:nowritebarrier
   148  func newosproc(mp *m) {
   149  	var (
   150  		attr pthreadattr
   151  		oset sigset
   152  		tid  pthread
   153  		ret  int32
   154  		size uint64
   155  	)
   156  
   157  	if pthread_attr_init(&attr) != 0 {
   158  		throw("pthread_attr_init")
   159  	}
   160  	// Allocate a new 2MB stack.
   161  	if pthread_attr_setstack(&attr, 0, 0x200000) != 0 {
   162  		throw("pthread_attr_setstack")
   163  	}
   164  	// Read back the allocated stack.
   165  	if pthread_attr_getstack(&attr, unsafe.Pointer(&mp.g0.stack.hi), &size) != 0 {
   166  		throw("pthread_attr_getstack")
   167  	}
   168  	mp.g0.stack.lo = mp.g0.stack.hi - uintptr(size)
   169  	if pthread_attr_setdetachstate(&attr, _PTHREAD_CREATE_DETACHED) != 0 {
   170  		throw("pthread_attr_setdetachstate")
   171  	}
   172  
   173  	// Disable signals during create, so that the new thread starts
   174  	// with signals disabled. It will enable them in minit.
   175  	sigprocmask(_SIG_SETMASK, &sigset_all, &oset)
   176  	ret = pthread_create(&tid, &attr, abi.FuncPCABI0(tstart_sysvicall), unsafe.Pointer(mp))
   177  	sigprocmask(_SIG_SETMASK, &oset, nil)
   178  	if ret != 0 {
   179  		print("runtime: failed to create new OS thread (have ", mcount(), " already; errno=", ret, ")\n")
   180  		if ret == -_EAGAIN {
   181  			println("runtime: may need to increase max user processes (ulimit -u)")
   182  		}
   183  		throw("newosproc")
   184  	}
   185  }
   186  
   187  func exitThread(wait *uint32) {
   188  	// We should never reach exitThread on Solaris because we let
   189  	// libc clean up threads.
   190  	throw("exitThread")
   191  }
   192  
   193  var urandom_dev = []byte("/dev/urandom\x00")
   194  
   195  //go:nosplit
   196  func getRandomData(r []byte) {
   197  	fd := open(&urandom_dev[0], 0 /* O_RDONLY */, 0)
   198  	n := read(fd, unsafe.Pointer(&r[0]), int32(len(r)))
   199  	closefd(fd)
   200  	extendRandom(r, int(n))
   201  }
   202  
   203  func goenvs() {
   204  	goenvs_unix()
   205  }
   206  
   207  // Called to initialize a new m (including the bootstrap m).
   208  // Called on the parent thread (main thread in case of bootstrap), can allocate memory.
   209  func mpreinit(mp *m) {
   210  	mp.gsignal = malg(32 * 1024)
   211  	mp.gsignal.m = mp
   212  }
   213  
   214  func miniterrno()
   215  
   216  // Called to initialize a new m (including the bootstrap m).
   217  // Called on the new thread, cannot allocate memory.
   218  func minit() {
   219  	asmcgocall(unsafe.Pointer(abi.FuncPCABI0(miniterrno)), unsafe.Pointer(&libc____errno))
   220  
   221  	minitSignals()
   222  
   223  	getg().m.procid = uint64(pthread_self())
   224  }
   225  
   226  // Called from dropm to undo the effect of an minit.
   227  func unminit() {
   228  	unminitSignals()
   229  }
   230  
   231  // Called from exitm, but not from drop, to undo the effect of thread-owned
   232  // resources in minit, semacreate, or elsewhere. Do not take locks after calling this.
   233  func mdestroy(mp *m) {
   234  }
   235  
   236  func sigtramp()
   237  
   238  //go:nosplit
   239  //go:nowritebarrierrec
   240  func setsig(i uint32, fn uintptr) {
   241  	var sa sigactiont
   242  
   243  	sa.sa_flags = _SA_SIGINFO | _SA_ONSTACK | _SA_RESTART
   244  	sa.sa_mask = sigset_all
   245  	if fn == abi.FuncPCABIInternal(sighandler) { // abi.FuncPCABIInternal(sighandler) matches the callers in signal_unix.go
   246  		fn = abi.FuncPCABI0(sigtramp)
   247  	}
   248  	*((*uintptr)(unsafe.Pointer(&sa._funcptr))) = fn
   249  	sigaction(i, &sa, nil)
   250  }
   251  
   252  //go:nosplit
   253  //go:nowritebarrierrec
   254  func setsigstack(i uint32) {
   255  	var sa sigactiont
   256  	sigaction(i, nil, &sa)
   257  	if sa.sa_flags&_SA_ONSTACK != 0 {
   258  		return
   259  	}
   260  	sa.sa_flags |= _SA_ONSTACK
   261  	sigaction(i, &sa, nil)
   262  }
   263  
   264  //go:nosplit
   265  //go:nowritebarrierrec
   266  func getsig(i uint32) uintptr {
   267  	var sa sigactiont
   268  	sigaction(i, nil, &sa)
   269  	return *((*uintptr)(unsafe.Pointer(&sa._funcptr)))
   270  }
   271  
   272  // setSignaltstackSP sets the ss_sp field of a stackt.
   273  //go:nosplit
   274  func setSignalstackSP(s *stackt, sp uintptr) {
   275  	*(*uintptr)(unsafe.Pointer(&s.ss_sp)) = sp
   276  }
   277  
   278  //go:nosplit
   279  //go:nowritebarrierrec
   280  func sigaddset(mask *sigset, i int) {
   281  	mask.__sigbits[(i-1)/32] |= 1 << ((uint32(i) - 1) & 31)
   282  }
   283  
   284  func sigdelset(mask *sigset, i int) {
   285  	mask.__sigbits[(i-1)/32] &^= 1 << ((uint32(i) - 1) & 31)
   286  }
   287  
   288  //go:nosplit
   289  func (c *sigctxt) fixsigcode(sig uint32) {
   290  }
   291  
   292  func setProcessCPUProfiler(hz int32) {
   293  	setProcessCPUProfilerTimer(hz)
   294  }
   295  
   296  func setThreadCPUProfiler(hz int32) {
   297  	setThreadCPUProfilerHz(hz)
   298  }
   299  
   300  //go:nosplit
   301  func validSIGPROF(mp *m, c *sigctxt) bool {
   302  	return true
   303  }
   304  
   305  //go:nosplit
   306  func semacreate(mp *m) {
   307  	if mp.waitsema != 0 {
   308  		return
   309  	}
   310  
   311  	var sem *semt
   312  	_g_ := getg()
   313  
   314  	// Call libc's malloc rather than malloc. This will
   315  	// allocate space on the C heap. We can't call malloc
   316  	// here because it could cause a deadlock.
   317  	_g_.m.libcall.fn = uintptr(unsafe.Pointer(&libc_malloc))
   318  	_g_.m.libcall.n = 1
   319  	_g_.m.scratch = mscratch{}
   320  	_g_.m.scratch.v[0] = unsafe.Sizeof(*sem)
   321  	_g_.m.libcall.args = uintptr(unsafe.Pointer(&_g_.m.scratch))
   322  	asmcgocall(unsafe.Pointer(&asmsysvicall6x), unsafe.Pointer(&_g_.m.libcall))
   323  	sem = (*semt)(unsafe.Pointer(_g_.m.libcall.r1))
   324  	if sem_init(sem, 0, 0) != 0 {
   325  		throw("sem_init")
   326  	}
   327  	mp.waitsema = uintptr(unsafe.Pointer(sem))
   328  }
   329  
   330  //go:nosplit
   331  func semasleep(ns int64) int32 {
   332  	mp := getg().m
   333  	if ns >= 0 {
   334  		mp.ts.tv_sec = ns / 1000000000
   335  		mp.ts.tv_nsec = ns % 1000000000
   336  
   337  		mp.libcall.fn = uintptr(unsafe.Pointer(&libc_sem_reltimedwait_np))
   338  		mp.libcall.n = 2
   339  		mp.scratch = mscratch{}
   340  		mp.scratch.v[0] = mp.waitsema
   341  		mp.scratch.v[1] = uintptr(unsafe.Pointer(&mp.ts))
   342  		mp.libcall.args = uintptr(unsafe.Pointer(&mp.scratch))
   343  		asmcgocall(unsafe.Pointer(&asmsysvicall6x), unsafe.Pointer(&mp.libcall))
   344  		if *mp.perrno != 0 {
   345  			if *mp.perrno == _ETIMEDOUT || *mp.perrno == _EAGAIN || *mp.perrno == _EINTR {
   346  				return -1
   347  			}
   348  			throw("sem_reltimedwait_np")
   349  		}
   350  		return 0
   351  	}
   352  	for {
   353  		mp.libcall.fn = uintptr(unsafe.Pointer(&libc_sem_wait))
   354  		mp.libcall.n = 1
   355  		mp.scratch = mscratch{}
   356  		mp.scratch.v[0] = mp.waitsema
   357  		mp.libcall.args = uintptr(unsafe.Pointer(&mp.scratch))
   358  		asmcgocall(unsafe.Pointer(&asmsysvicall6x), unsafe.Pointer(&mp.libcall))
   359  		if mp.libcall.r1 == 0 {
   360  			break
   361  		}
   362  		if *mp.perrno == _EINTR {
   363  			continue
   364  		}
   365  		throw("sem_wait")
   366  	}
   367  	return 0
   368  }
   369  
   370  //go:nosplit
   371  func semawakeup(mp *m) {
   372  	if sem_post((*semt)(unsafe.Pointer(mp.waitsema))) != 0 {
   373  		throw("sem_post")
   374  	}
   375  }
   376  
   377  //go:nosplit
   378  func closefd(fd int32) int32 {
   379  	return int32(sysvicall1(&libc_close, uintptr(fd)))
   380  }
   381  
   382  //go:nosplit
   383  func exit(r int32) {
   384  	sysvicall1(&libc_exit, uintptr(r))
   385  }
   386  
   387  //go:nosplit
   388  func getcontext(context *ucontext) /* int32 */ {
   389  	sysvicall1(&libc_getcontext, uintptr(unsafe.Pointer(context)))
   390  }
   391  
   392  //go:nosplit
   393  func madvise(addr unsafe.Pointer, n uintptr, flags int32) {
   394  	sysvicall3(&libc_madvise, uintptr(addr), uintptr(n), uintptr(flags))
   395  }
   396  
   397  //go:nosplit
   398  func mmap(addr unsafe.Pointer, n uintptr, prot, flags, fd int32, off uint32) (unsafe.Pointer, int) {
   399  	p, err := doMmap(uintptr(addr), n, uintptr(prot), uintptr(flags), uintptr(fd), uintptr(off))
   400  	if p == ^uintptr(0) {
   401  		return nil, int(err)
   402  	}
   403  	return unsafe.Pointer(p), 0
   404  }
   405  
   406  //go:nosplit
   407  //go:cgo_unsafe_args
   408  func doMmap(addr, n, prot, flags, fd, off uintptr) (uintptr, uintptr) {
   409  	var libcall libcall
   410  	libcall.fn = uintptr(unsafe.Pointer(&libc_mmap))
   411  	libcall.n = 6
   412  	libcall.args = uintptr(noescape(unsafe.Pointer(&addr)))
   413  	asmcgocall(unsafe.Pointer(&asmsysvicall6x), unsafe.Pointer(&libcall))
   414  	return libcall.r1, libcall.err
   415  }
   416  
   417  //go:nosplit
   418  func munmap(addr unsafe.Pointer, n uintptr) {
   419  	sysvicall2(&libc_munmap, uintptr(addr), uintptr(n))
   420  }
   421  
   422  const (
   423  	_CLOCK_REALTIME  = 3
   424  	_CLOCK_MONOTONIC = 4
   425  )
   426  
   427  //go:nosplit
   428  func nanotime1() int64 {
   429  	var ts mts
   430  	sysvicall2(&libc_clock_gettime, _CLOCK_MONOTONIC, uintptr(unsafe.Pointer(&ts)))
   431  	return ts.tv_sec*1e9 + ts.tv_nsec
   432  }
   433  
   434  //go:nosplit
   435  func open(path *byte, mode, perm int32) int32 {
   436  	return int32(sysvicall3(&libc_open, uintptr(unsafe.Pointer(path)), uintptr(mode), uintptr(perm)))
   437  }
   438  
   439  func pthread_attr_destroy(attr *pthreadattr) int32 {
   440  	return int32(sysvicall1(&libc_pthread_attr_destroy, uintptr(unsafe.Pointer(attr))))
   441  }
   442  
   443  func pthread_attr_getstack(attr *pthreadattr, addr unsafe.Pointer, size *uint64) int32 {
   444  	return int32(sysvicall3(&libc_pthread_attr_getstack, uintptr(unsafe.Pointer(attr)), uintptr(addr), uintptr(unsafe.Pointer(size))))
   445  }
   446  
   447  func pthread_attr_init(attr *pthreadattr) int32 {
   448  	return int32(sysvicall1(&libc_pthread_attr_init, uintptr(unsafe.Pointer(attr))))
   449  }
   450  
   451  func pthread_attr_setdetachstate(attr *pthreadattr, state int32) int32 {
   452  	return int32(sysvicall2(&libc_pthread_attr_setdetachstate, uintptr(unsafe.Pointer(attr)), uintptr(state)))
   453  }
   454  
   455  func pthread_attr_setstack(attr *pthreadattr, addr uintptr, size uint64) int32 {
   456  	return int32(sysvicall3(&libc_pthread_attr_setstack, uintptr(unsafe.Pointer(attr)), uintptr(addr), uintptr(size)))
   457  }
   458  
   459  func pthread_create(thread *pthread, attr *pthreadattr, fn uintptr, arg unsafe.Pointer) int32 {
   460  	return int32(sysvicall4(&libc_pthread_create, uintptr(unsafe.Pointer(thread)), uintptr(unsafe.Pointer(attr)), uintptr(fn), uintptr(arg)))
   461  }
   462  
   463  func pthread_self() pthread {
   464  	return pthread(sysvicall0(&libc_pthread_self))
   465  }
   466  
   467  func signalM(mp *m, sig int) {
   468  	sysvicall2(&libc_pthread_kill, uintptr(pthread(mp.procid)), uintptr(sig))
   469  }
   470  
   471  //go:nosplit
   472  //go:nowritebarrierrec
   473  func raise(sig uint32) /* int32 */ {
   474  	sysvicall1(&libc_raise, uintptr(sig))
   475  }
   476  
   477  func raiseproc(sig uint32) /* int32 */ {
   478  	pid := sysvicall0(&libc_getpid)
   479  	sysvicall2(&libc_kill, pid, uintptr(sig))
   480  }
   481  
   482  //go:nosplit
   483  func read(fd int32, buf unsafe.Pointer, nbyte int32) int32 {
   484  	r1, err := sysvicall3Err(&libc_read, uintptr(fd), uintptr(buf), uintptr(nbyte))
   485  	if c := int32(r1); c >= 0 {
   486  		return c
   487  	}
   488  	return -int32(err)
   489  }
   490  
   491  //go:nosplit
   492  func sem_init(sem *semt, pshared int32, value uint32) int32 {
   493  	return int32(sysvicall3(&libc_sem_init, uintptr(unsafe.Pointer(sem)), uintptr(pshared), uintptr(value)))
   494  }
   495  
   496  //go:nosplit
   497  func sem_post(sem *semt) int32 {
   498  	return int32(sysvicall1(&libc_sem_post, uintptr(unsafe.Pointer(sem))))
   499  }
   500  
   501  //go:nosplit
   502  func sem_reltimedwait_np(sem *semt, timeout *timespec) int32 {
   503  	return int32(sysvicall2(&libc_sem_reltimedwait_np, uintptr(unsafe.Pointer(sem)), uintptr(unsafe.Pointer(timeout))))
   504  }
   505  
   506  //go:nosplit
   507  func sem_wait(sem *semt) int32 {
   508  	return int32(sysvicall1(&libc_sem_wait, uintptr(unsafe.Pointer(sem))))
   509  }
   510  
   511  func setitimer(which int32, value *itimerval, ovalue *itimerval) /* int32 */ {
   512  	sysvicall3(&libc_setitimer, uintptr(which), uintptr(unsafe.Pointer(value)), uintptr(unsafe.Pointer(ovalue)))
   513  }
   514  
   515  //go:nosplit
   516  //go:nowritebarrierrec
   517  func sigaction(sig uint32, act *sigactiont, oact *sigactiont) /* int32 */ {
   518  	sysvicall3(&libc_sigaction, uintptr(sig), uintptr(unsafe.Pointer(act)), uintptr(unsafe.Pointer(oact)))
   519  }
   520  
   521  //go:nosplit
   522  //go:nowritebarrierrec
   523  func sigaltstack(ss *stackt, oss *stackt) /* int32 */ {
   524  	sysvicall2(&libc_sigaltstack, uintptr(unsafe.Pointer(ss)), uintptr(unsafe.Pointer(oss)))
   525  }
   526  
   527  //go:nosplit
   528  //go:nowritebarrierrec
   529  func sigprocmask(how int32, set *sigset, oset *sigset) /* int32 */ {
   530  	sysvicall3(&libc_sigprocmask, uintptr(how), uintptr(unsafe.Pointer(set)), uintptr(unsafe.Pointer(oset)))
   531  }
   532  
   533  func sysconf(name int32) int64 {
   534  	return int64(sysvicall1(&libc_sysconf, uintptr(name)))
   535  }
   536  
   537  func usleep1(usec uint32)
   538  
   539  //go:nosplit
   540  func usleep_no_g(µs uint32) {
   541  	usleep1(µs)
   542  }
   543  
   544  //go:nosplit
   545  func usleep(µs uint32) {
   546  	usleep1(µs)
   547  }
   548  
   549  func walltime() (sec int64, nsec int32) {
   550  	var ts mts
   551  	sysvicall2(&libc_clock_gettime, _CLOCK_REALTIME, uintptr(unsafe.Pointer(&ts)))
   552  	return ts.tv_sec, int32(ts.tv_nsec)
   553  }
   554  
   555  //go:nosplit
   556  func write1(fd uintptr, buf unsafe.Pointer, nbyte int32) int32 {
   557  	r1, err := sysvicall3Err(&libc_write, fd, uintptr(buf), uintptr(nbyte))
   558  	if c := int32(r1); c >= 0 {
   559  		return c
   560  	}
   561  	return -int32(err)
   562  }
   563  
   564  //go:nosplit
   565  func pipe() (r, w int32, errno int32) {
   566  	var p [2]int32
   567  	_, e := sysvicall1Err(&libc_pipe, uintptr(noescape(unsafe.Pointer(&p))))
   568  	return p[0], p[1], int32(e)
   569  }
   570  
   571  //go:nosplit
   572  func pipe2(flags int32) (r, w int32, errno int32) {
   573  	var p [2]int32
   574  	_, e := sysvicall2Err(&libc_pipe2, uintptr(noescape(unsafe.Pointer(&p))), uintptr(flags))
   575  	return p[0], p[1], int32(e)
   576  }
   577  
   578  //go:nosplit
   579  func closeonexec(fd int32) {
   580  	fcntl(fd, _F_SETFD, _FD_CLOEXEC)
   581  }
   582  
   583  //go:nosplit
   584  func setNonblock(fd int32) {
   585  	flags := fcntl(fd, _F_GETFL, 0)
   586  	fcntl(fd, _F_SETFL, flags|_O_NONBLOCK)
   587  }
   588  
   589  func osyield1()
   590  
   591  //go:nosplit
   592  func osyield_no_g() {
   593  	osyield1()
   594  }
   595  
   596  //go:nosplit
   597  func osyield() {
   598  	sysvicall0(&libc_sched_yield)
   599  }
   600  
   601  //go:linkname executablePath os.executablePath
   602  var executablePath string
   603  
   604  func sysargs(argc int32, argv **byte) {
   605  	n := argc + 1
   606  
   607  	// skip over argv, envp to get to auxv
   608  	for argv_index(argv, n) != nil {
   609  		n++
   610  	}
   611  
   612  	// skip NULL separator
   613  	n++
   614  
   615  	// now argv+n is auxv
   616  	auxv := (*[1 << 28]uintptr)(add(unsafe.Pointer(argv), uintptr(n)*goarch.PtrSize))
   617  	sysauxv(auxv[:])
   618  }
   619  
   620  const (
   621  	_AT_NULL         = 0    // Terminates the vector
   622  	_AT_PAGESZ       = 6    // Page size in bytes
   623  	_AT_SUN_EXECNAME = 2014 // exec() path name
   624  )
   625  
   626  func sysauxv(auxv []uintptr) {
   627  	for i := 0; auxv[i] != _AT_NULL; i += 2 {
   628  		tag, val := auxv[i], auxv[i+1]
   629  		switch tag {
   630  		case _AT_PAGESZ:
   631  			physPageSize = val
   632  		case _AT_SUN_EXECNAME:
   633  			executablePath = gostringnocopy((*byte)(unsafe.Pointer(val)))
   634  		}
   635  	}
   636  }
   637  
   638  // sigPerThreadSyscall is only used on linux, so we assign a bogus signal
   639  // number.
   640  const sigPerThreadSyscall = 1 << 31
   641  
   642  //go:nosplit
   643  func runPerThreadSyscall() {
   644  	throw("runPerThreadSyscall only valid on linux")
   645  }
   646  

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