os3_solaris.go

Documentation: runtime

     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  	"internal/runtime/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  	// Call miniterrno so that we can safely make system calls
   137  	// before calling minit on m0.
   138  	asmcgocall(unsafe.Pointer(abi.FuncPCABI0(miniterrno)), unsafe.Pointer(&libc____errno))
   139  
   140  	ncpu = getncpu()
   141  	if physPageSize == 0 {
   142  		physPageSize = getPageSize()
   143  	}
   144  }
   145  
   146  func tstart_sysvicall(newm *m) uint32
   147  
   148  // May run with m.p==nil, so write barriers are not allowed.
   149  //
   150  //go:nowritebarrier
   151  func newosproc(mp *m) {
   152  	var (
   153  		attr pthreadattr
   154  		oset sigset
   155  		tid  pthread
   156  		ret  int32
   157  		size uint64
   158  	)
   159  
   160  	if pthread_attr_init(&attr) != 0 {
   161  		throw("pthread_attr_init")
   162  	}
   163  	// Allocate a new 2MB stack.
   164  	if pthread_attr_setstack(&attr, 0, 0x200000) != 0 {
   165  		throw("pthread_attr_setstack")
   166  	}
   167  	// Read back the allocated stack.
   168  	if pthread_attr_getstack(&attr, unsafe.Pointer(&mp.g0.stack.hi), &size) != 0 {
   169  		throw("pthread_attr_getstack")
   170  	}
   171  	mp.g0.stack.lo = mp.g0.stack.hi - uintptr(size)
   172  	if pthread_attr_setdetachstate(&attr, _PTHREAD_CREATE_DETACHED) != 0 {
   173  		throw("pthread_attr_setdetachstate")
   174  	}
   175  
   176  	// Disable signals during create, so that the new thread starts
   177  	// with signals disabled. It will enable them in minit.
   178  	sigprocmask(_SIG_SETMASK, &sigset_all, &oset)
   179  	ret = retryOnEAGAIN(func() int32 {
   180  		return pthread_create(&tid, &attr, abi.FuncPCABI0(tstart_sysvicall), unsafe.Pointer(mp))
   181  	})
   182  	sigprocmask(_SIG_SETMASK, &oset, nil)
   183  	if ret != 0 {
   184  		print("runtime: failed to create new OS thread (have ", mcount(), " already; errno=", ret, ")\n")
   185  		if ret == _EAGAIN {
   186  			println("runtime: may need to increase max user processes (ulimit -u)")
   187  		}
   188  		throw("newosproc")
   189  	}
   190  }
   191  
   192  func exitThread(wait *atomic.Uint32) {
   193  	// We should never reach exitThread on Solaris because we let
   194  	// libc clean up threads.
   195  	throw("exitThread")
   196  }
   197  
   198  var urandom_dev = []byte("/dev/urandom\x00")
   199  
   200  //go:nosplit
   201  func readRandom(r []byte) int {
   202  	fd := open(&urandom_dev[0], 0 /* O_RDONLY */, 0)
   203  	n := read(fd, unsafe.Pointer(&r[0]), int32(len(r)))
   204  	closefd(fd)
   205  	return int(n)
   206  }
   207  
   208  func goenvs() {
   209  	goenvs_unix()
   210  }
   211  
   212  // Called to initialize a new m (including the bootstrap m).
   213  // Called on the parent thread (main thread in case of bootstrap), can allocate memory.
   214  func mpreinit(mp *m) {
   215  	mp.gsignal = malg(32 * 1024)
   216  	mp.gsignal.m = mp
   217  }
   218  
   219  func miniterrno()
   220  
   221  // Called to initialize a new m (including the bootstrap m).
   222  // Called on the new thread, cannot allocate memory.
   223  func minit() {
   224  	asmcgocall(unsafe.Pointer(abi.FuncPCABI0(miniterrno)), unsafe.Pointer(&libc____errno))
   225  
   226  	minitSignals()
   227  
   228  	getg().m.procid = uint64(pthread_self())
   229  }
   230  
   231  // Called from dropm to undo the effect of an minit.
   232  func unminit() {
   233  	unminitSignals()
   234  	getg().m.procid = 0
   235  }
   236  
   237  // Called from exitm, but not from drop, to undo the effect of thread-owned
   238  // resources in minit, semacreate, or elsewhere. Do not take locks after calling this.
   239  func mdestroy(mp *m) {
   240  }
   241  
   242  func sigtramp()
   243  
   244  //go:nosplit
   245  //go:nowritebarrierrec
   246  func setsig(i uint32, fn uintptr) {
   247  	var sa sigactiont
   248  
   249  	sa.sa_flags = _SA_SIGINFO | _SA_ONSTACK | _SA_RESTART
   250  	sa.sa_mask = sigset_all
   251  	if fn == abi.FuncPCABIInternal(sighandler) { // abi.FuncPCABIInternal(sighandler) matches the callers in signal_unix.go
   252  		fn = abi.FuncPCABI0(sigtramp)
   253  	}
   254  	*((*uintptr)(unsafe.Pointer(&sa._funcptr))) = fn
   255  	sigaction(i, &sa, nil)
   256  }
   257  
   258  //go:nosplit
   259  //go:nowritebarrierrec
   260  func setsigstack(i uint32) {
   261  	var sa sigactiont
   262  	sigaction(i, nil, &sa)
   263  	if sa.sa_flags&_SA_ONSTACK != 0 {
   264  		return
   265  	}
   266  	sa.sa_flags |= _SA_ONSTACK
   267  	sigaction(i, &sa, nil)
   268  }
   269  
   270  //go:nosplit
   271  //go:nowritebarrierrec
   272  func getsig(i uint32) uintptr {
   273  	var sa sigactiont
   274  	sigaction(i, nil, &sa)
   275  	return *((*uintptr)(unsafe.Pointer(&sa._funcptr)))
   276  }
   277  
   278  // setSignalstackSP sets the ss_sp field of a stackt.
   279  //
   280  //go:nosplit
   281  func setSignalstackSP(s *stackt, sp uintptr) {
   282  	*(*uintptr)(unsafe.Pointer(&s.ss_sp)) = sp
   283  }
   284  
   285  //go:nosplit
   286  //go:nowritebarrierrec
   287  func sigaddset(mask *sigset, i int) {
   288  	mask.__sigbits[(i-1)/32] |= 1 << ((uint32(i) - 1) & 31)
   289  }
   290  
   291  func sigdelset(mask *sigset, i int) {
   292  	mask.__sigbits[(i-1)/32] &^= 1 << ((uint32(i) - 1) & 31)
   293  }
   294  
   295  //go:nosplit
   296  func (c *sigctxt) fixsigcode(sig uint32) {
   297  }
   298  
   299  func setProcessCPUProfiler(hz int32) {
   300  	setProcessCPUProfilerTimer(hz)
   301  }
   302  
   303  func setThreadCPUProfiler(hz int32) {
   304  	setThreadCPUProfilerHz(hz)
   305  }
   306  
   307  //go:nosplit
   308  func validSIGPROF(mp *m, c *sigctxt) bool {
   309  	return true
   310  }
   311  
   312  //go:nosplit
   313  func semacreate(mp *m) {
   314  	if mp.waitsema != 0 {
   315  		return
   316  	}
   317  
   318  	var sem *semt
   319  
   320  	// Call libc's malloc rather than malloc. This will
   321  	// allocate space on the C heap. We can't call malloc
   322  	// here because it could cause a deadlock.
   323  	mp.libcall.fn = uintptr(unsafe.Pointer(&libc_malloc))
   324  	mp.libcall.n = 1
   325  	mp.scratch = mscratch{}
   326  	mp.scratch.v[0] = unsafe.Sizeof(*sem)
   327  	mp.libcall.args = uintptr(unsafe.Pointer(&mp.scratch))
   328  	asmcgocall(unsafe.Pointer(&asmsysvicall6x), unsafe.Pointer(&mp.libcall))
   329  	sem = (*semt)(unsafe.Pointer(mp.libcall.r1))
   330  	if sem_init(sem, 0, 0) != 0 {
   331  		throw("sem_init")
   332  	}
   333  	mp.waitsema = uintptr(unsafe.Pointer(sem))
   334  }
   335  
   336  //go:nosplit
   337  func semasleep(ns int64) int32 {
   338  	mp := getg().m
   339  	if ns >= 0 {
   340  		mp.ts.tv_sec = ns / 1000000000
   341  		mp.ts.tv_nsec = ns % 1000000000
   342  
   343  		mp.libcall.fn = uintptr(unsafe.Pointer(&libc_sem_reltimedwait_np))
   344  		mp.libcall.n = 2
   345  		mp.scratch = mscratch{}
   346  		mp.scratch.v[0] = mp.waitsema
   347  		mp.scratch.v[1] = uintptr(unsafe.Pointer(&mp.ts))
   348  		mp.libcall.args = uintptr(unsafe.Pointer(&mp.scratch))
   349  		asmcgocall(unsafe.Pointer(&asmsysvicall6x), unsafe.Pointer(&mp.libcall))
   350  		if *mp.perrno != 0 {
   351  			if *mp.perrno == _ETIMEDOUT || *mp.perrno == _EAGAIN || *mp.perrno == _EINTR {
   352  				return -1
   353  			}
   354  			throw("sem_reltimedwait_np")
   355  		}
   356  		return 0
   357  	}
   358  	for {
   359  		mp.libcall.fn = uintptr(unsafe.Pointer(&libc_sem_wait))
   360  		mp.libcall.n = 1
   361  		mp.scratch = mscratch{}
   362  		mp.scratch.v[0] = mp.waitsema
   363  		mp.libcall.args = uintptr(unsafe.Pointer(&mp.scratch))
   364  		asmcgocall(unsafe.Pointer(&asmsysvicall6x), unsafe.Pointer(&mp.libcall))
   365  		if mp.libcall.r1 == 0 {
   366  			break
   367  		}
   368  		if *mp.perrno == _EINTR {
   369  			continue
   370  		}
   371  		throw("sem_wait")
   372  	}
   373  	return 0
   374  }
   375  
   376  //go:nosplit
   377  func semawakeup(mp *m) {
   378  	if sem_post((*semt)(unsafe.Pointer(mp.waitsema))) != 0 {
   379  		throw("sem_post")
   380  	}
   381  }
   382  
   383  //go:nosplit
   384  func closefd(fd int32) int32 {
   385  	return int32(sysvicall1(&libc_close, uintptr(fd)))
   386  }
   387  
   388  //go:nosplit
   389  func exit(r int32) {
   390  	sysvicall1(&libc_exit, uintptr(r))
   391  }
   392  
   393  //go:nosplit
   394  func getcontext(context *ucontext) /* int32 */ {
   395  	sysvicall1(&libc_getcontext, uintptr(unsafe.Pointer(context)))
   396  }
   397  
   398  //go:nosplit
   399  func madvise(addr unsafe.Pointer, n uintptr, flags int32) {
   400  	sysvicall3(&libc_madvise, uintptr(addr), uintptr(n), uintptr(flags))
   401  }
   402  
   403  //go:nosplit
   404  func mmap(addr unsafe.Pointer, n uintptr, prot, flags, fd int32, off uint32) (unsafe.Pointer, int) {
   405  	p, err := doMmap(uintptr(addr), n, uintptr(prot), uintptr(flags), uintptr(fd), uintptr(off))
   406  	if p == ^uintptr(0) {
   407  		return nil, int(err)
   408  	}
   409  	return unsafe.Pointer(p), 0
   410  }
   411  
   412  //go:nosplit
   413  //go:cgo_unsafe_args
   414  func doMmap(addr, n, prot, flags, fd, off uintptr) (uintptr, uintptr) {
   415  	var libcall libcall
   416  	libcall.fn = uintptr(unsafe.Pointer(&libc_mmap))
   417  	libcall.n = 6
   418  	libcall.args = uintptr(noescape(unsafe.Pointer(&addr)))
   419  	asmcgocall(unsafe.Pointer(&asmsysvicall6x), unsafe.Pointer(&libcall))
   420  	return libcall.r1, libcall.err
   421  }
   422  
   423  //go:nosplit
   424  func munmap(addr unsafe.Pointer, n uintptr) {
   425  	sysvicall2(&libc_munmap, uintptr(addr), uintptr(n))
   426  }
   427  
   428  const (
   429  	_CLOCK_REALTIME  = 3
   430  	_CLOCK_MONOTONIC = 4
   431  )
   432  
   433  //go:nosplit
   434  func nanotime1() int64 {
   435  	var ts mts
   436  	sysvicall2(&libc_clock_gettime, _CLOCK_MONOTONIC, uintptr(unsafe.Pointer(&ts)))
   437  	return ts.tv_sec*1e9 + ts.tv_nsec
   438  }
   439  
   440  //go:nosplit
   441  func open(path *byte, mode, perm int32) int32 {
   442  	return int32(sysvicall3(&libc_open, uintptr(unsafe.Pointer(path)), uintptr(mode), uintptr(perm)))
   443  }
   444  
   445  func pthread_attr_destroy(attr *pthreadattr) int32 {
   446  	return int32(sysvicall1(&libc_pthread_attr_destroy, uintptr(unsafe.Pointer(attr))))
   447  }
   448  
   449  func pthread_attr_getstack(attr *pthreadattr, addr unsafe.Pointer, size *uint64) int32 {
   450  	return int32(sysvicall3(&libc_pthread_attr_getstack, uintptr(unsafe.Pointer(attr)), uintptr(addr), uintptr(unsafe.Pointer(size))))
   451  }
   452  
   453  func pthread_attr_init(attr *pthreadattr) int32 {
   454  	return int32(sysvicall1(&libc_pthread_attr_init, uintptr(unsafe.Pointer(attr))))
   455  }
   456  
   457  func pthread_attr_setdetachstate(attr *pthreadattr, state int32) int32 {
   458  	return int32(sysvicall2(&libc_pthread_attr_setdetachstate, uintptr(unsafe.Pointer(attr)), uintptr(state)))
   459  }
   460  
   461  func pthread_attr_setstack(attr *pthreadattr, addr uintptr, size uint64) int32 {
   462  	return int32(sysvicall3(&libc_pthread_attr_setstack, uintptr(unsafe.Pointer(attr)), uintptr(addr), uintptr(size)))
   463  }
   464  
   465  func pthread_create(thread *pthread, attr *pthreadattr, fn uintptr, arg unsafe.Pointer) int32 {
   466  	return int32(sysvicall4(&libc_pthread_create, uintptr(unsafe.Pointer(thread)), uintptr(unsafe.Pointer(attr)), uintptr(fn), uintptr(arg)))
   467  }
   468  
   469  func pthread_self() pthread {
   470  	return pthread(sysvicall0(&libc_pthread_self))
   471  }
   472  
   473  func signalM(mp *m, sig int) {
   474  	sysvicall2(&libc_pthread_kill, uintptr(pthread(mp.procid)), uintptr(sig))
   475  }
   476  
   477  //go:nosplit
   478  //go:nowritebarrierrec
   479  func raise(sig uint32) /* int32 */ {
   480  	sysvicall1(&libc_raise, uintptr(sig))
   481  }
   482  
   483  func raiseproc(sig uint32) /* int32 */ {
   484  	pid := sysvicall0(&libc_getpid)
   485  	sysvicall2(&libc_kill, pid, uintptr(sig))
   486  }
   487  
   488  //go:nosplit
   489  func read(fd int32, buf unsafe.Pointer, nbyte int32) int32 {
   490  	r1, err := sysvicall3Err(&libc_read, uintptr(fd), uintptr(buf), uintptr(nbyte))
   491  	if c := int32(r1); c >= 0 {
   492  		return c
   493  	}
   494  	return -int32(err)
   495  }
   496  
   497  //go:nosplit
   498  func sem_init(sem *semt, pshared int32, value uint32) int32 {
   499  	return int32(sysvicall3(&libc_sem_init, uintptr(unsafe.Pointer(sem)), uintptr(pshared), uintptr(value)))
   500  }
   501  
   502  //go:nosplit
   503  func sem_post(sem *semt) int32 {
   504  	return int32(sysvicall1(&libc_sem_post, uintptr(unsafe.Pointer(sem))))
   505  }
   506  
   507  //go:nosplit
   508  func sem_reltimedwait_np(sem *semt, timeout *timespec) int32 {
   509  	return int32(sysvicall2(&libc_sem_reltimedwait_np, uintptr(unsafe.Pointer(sem)), uintptr(unsafe.Pointer(timeout))))
   510  }
   511  
   512  //go:nosplit
   513  func sem_wait(sem *semt) int32 {
   514  	return int32(sysvicall1(&libc_sem_wait, uintptr(unsafe.Pointer(sem))))
   515  }
   516  
   517  func setitimer(which int32, value *itimerval, ovalue *itimerval) /* int32 */ {
   518  	sysvicall3(&libc_setitimer, uintptr(which), uintptr(unsafe.Pointer(value)), uintptr(unsafe.Pointer(ovalue)))
   519  }
   520  
   521  //go:nosplit
   522  //go:nowritebarrierrec
   523  func sigaction(sig uint32, act *sigactiont, oact *sigactiont) /* int32 */ {
   524  	sysvicall3(&libc_sigaction, uintptr(sig), uintptr(unsafe.Pointer(act)), uintptr(unsafe.Pointer(oact)))
   525  }
   526  
   527  //go:nosplit
   528  //go:nowritebarrierrec
   529  func sigaltstack(ss *stackt, oss *stackt) /* int32 */ {
   530  	sysvicall2(&libc_sigaltstack, uintptr(unsafe.Pointer(ss)), uintptr(unsafe.Pointer(oss)))
   531  }
   532  
   533  //go:nosplit
   534  //go:nowritebarrierrec
   535  func sigprocmask(how int32, set *sigset, oset *sigset) /* int32 */ {
   536  	sysvicall3(&libc_sigprocmask, uintptr(how), uintptr(unsafe.Pointer(set)), uintptr(unsafe.Pointer(oset)))
   537  }
   538  
   539  func sysconf(name int32) int64 {
   540  	return int64(sysvicall1(&libc_sysconf, uintptr(name)))
   541  }
   542  
   543  func usleep1(usec uint32)
   544  
   545  //go:nosplit
   546  func usleep_no_g(µs uint32) {
   547  	usleep1(µs)
   548  }
   549  
   550  //go:nosplit
   551  func usleep(µs uint32) {
   552  	usleep1(µs)
   553  }
   554  
   555  func walltime() (sec int64, nsec int32) {
   556  	var ts mts
   557  	sysvicall2(&libc_clock_gettime, _CLOCK_REALTIME, uintptr(unsafe.Pointer(&ts)))
   558  	return ts.tv_sec, int32(ts.tv_nsec)
   559  }
   560  
   561  //go:nosplit
   562  func write1(fd uintptr, buf unsafe.Pointer, nbyte int32) int32 {
   563  	r1, err := sysvicall3Err(&libc_write, fd, uintptr(buf), uintptr(nbyte))
   564  	if c := int32(r1); c >= 0 {
   565  		return c
   566  	}
   567  	return -int32(err)
   568  }
   569  
   570  //go:nosplit
   571  func pipe2(flags int32) (r, w int32, errno int32) {
   572  	var p [2]int32
   573  	_, e := sysvicall2Err(&libc_pipe2, uintptr(noescape(unsafe.Pointer(&p))), uintptr(flags))
   574  	return p[0], p[1], int32(e)
   575  }
   576  
   577  //go:nosplit
   578  func fcntl(fd, cmd, arg int32) (ret int32, errno int32) {
   579  	r1, err := sysvicall3Err(&libc_fcntl, uintptr(fd), uintptr(cmd), uintptr(arg))
   580  	return int32(r1), int32(err)
   581  }
   582  
   583  func osyield1()
   584  
   585  //go:nosplit
   586  func osyield_no_g() {
   587  	osyield1()
   588  }
   589  
   590  //go:nosplit
   591  func osyield() {
   592  	sysvicall0(&libc_sched_yield)
   593  }
   594  
   595  //go:linkname executablePath os.executablePath
   596  var executablePath string
   597  
   598  func sysargs(argc int32, argv **byte) {
   599  	n := argc + 1
   600  
   601  	// skip over argv, envp to get to auxv
   602  	for argv_index(argv, n) != nil {
   603  		n++
   604  	}
   605  
   606  	// skip NULL separator
   607  	n++
   608  
   609  	// now argv+n is auxv
   610  	auxvp := (*[1 << 28]uintptr)(add(unsafe.Pointer(argv), uintptr(n)*goarch.PtrSize))
   611  	pairs := sysauxv(auxvp[:])
   612  	auxv = auxvp[: pairs*2 : pairs*2]
   613  }
   614  
   615  const (
   616  	_AT_NULL         = 0    // Terminates the vector
   617  	_AT_PAGESZ       = 6    // Page size in bytes
   618  	_AT_SUN_EXECNAME = 2014 // exec() path name
   619  )
   620  
   621  func sysauxv(auxv []uintptr) (pairs int) {
   622  	var i int
   623  	for i = 0; auxv[i] != _AT_NULL; i += 2 {
   624  		tag, val := auxv[i], auxv[i+1]
   625  		switch tag {
   626  		case _AT_PAGESZ:
   627  			physPageSize = val
   628  		case _AT_SUN_EXECNAME:
   629  			executablePath = gostringnocopy((*byte)(unsafe.Pointer(val)))
   630  		}
   631  	}
   632  	return i / 2
   633  }
   634  
   635  // sigPerThreadSyscall is only used on linux, so we assign a bogus signal
   636  // number.
   637  const sigPerThreadSyscall = 1 << 31
   638  
   639  //go:nosplit
   640  func runPerThreadSyscall() {
   641  	throw("runPerThreadSyscall only valid on linux")
   642  }
   643
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