mirror of
https://github.com/golang/go
synced 2024-10-04 18:31:22 -06:00
a46b434931
R=alex.brainman, dave, jsing, gobot, rsc CC=golang-codereviews https://golang.org/cl/35990043
580 lines
16 KiB
C
580 lines
16 KiB
C
// Copyright 2011 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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#include "runtime.h"
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#include "defs_GOOS_GOARCH.h"
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#include "os_GOOS.h"
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#include "signal_unix.h"
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#include "stack.h"
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#include "../../cmd/ld/textflag.h"
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#pragma dynexport end _end
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#pragma dynexport etext _etext
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#pragma dynexport edata _edata
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#pragma dynimport libc·___errno ___errno "libc.so"
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#pragma dynimport libc·clock_gettime clock_gettime "libc.so"
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#pragma dynimport libc·close close "libc.so"
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#pragma dynimport libc·exit exit "libc.so"
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#pragma dynimport libc·fstat fstat "libc.so"
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#pragma dynimport libc·getcontext getcontext "libc.so"
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#pragma dynimport libc·getrlimit getrlimit "libc.so"
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#pragma dynimport libc·malloc malloc "libc.so"
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#pragma dynimport libc·mmap mmap "libc.so"
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#pragma dynimport libc·munmap munmap "libc.so"
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#pragma dynimport libc·open open "libc.so"
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#pragma dynimport libc·pthread_attr_destroy pthread_attr_destroy "libc.so"
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#pragma dynimport libc·pthread_attr_getstack pthread_attr_getstack "libc.so"
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#pragma dynimport libc·pthread_attr_init pthread_attr_init "libc.so"
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#pragma dynimport libc·pthread_attr_setdetachstate pthread_attr_setdetachstate "libc.so"
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#pragma dynimport libc·pthread_attr_setstack pthread_attr_setstack "libc.so"
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#pragma dynimport libc·pthread_create pthread_create "libc.so"
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#pragma dynimport libc·raise raise "libc.so"
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#pragma dynimport libc·read read "libc.so"
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#pragma dynimport libc·select select "libc.so"
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#pragma dynimport libc·sched_yield sched_yield "libc.so"
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#pragma dynimport libc·sem_init sem_init "libc.so"
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#pragma dynimport libc·sem_post sem_post "libc.so"
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#pragma dynimport libc·sem_reltimedwait_np sem_reltimedwait_np "libc.so"
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#pragma dynimport libc·sem_wait sem_wait "libc.so"
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#pragma dynimport libc·setitimer setitimer "libc.so"
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#pragma dynimport libc·sigaction sigaction "libc.so"
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#pragma dynimport libc·sigaltstack sigaltstack "libc.so"
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#pragma dynimport libc·sigprocmask sigprocmask "libc.so"
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#pragma dynimport libc·sysconf sysconf "libc.so"
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#pragma dynimport libc·usleep usleep "libc.so"
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#pragma dynimport libc·write write "libc.so"
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extern uintptr libc·___errno;
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extern uintptr libc·clock_gettime;
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extern uintptr libc·close;
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extern uintptr libc·exit;
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extern uintptr libc·fstat;
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extern uintptr libc·getcontext;
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extern uintptr libc·getrlimit;
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extern uintptr libc·malloc;
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extern uintptr libc·mmap;
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extern uintptr libc·munmap;
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extern uintptr libc·open;
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extern uintptr libc·pthread_attr_destroy;
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extern uintptr libc·pthread_attr_getstack;
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extern uintptr libc·pthread_attr_init;
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extern uintptr libc·pthread_attr_setdetachstate;
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extern uintptr libc·pthread_attr_setstack;
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extern uintptr libc·pthread_create;
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extern uintptr libc·raise;
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extern uintptr libc·read;
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extern uintptr libc·sched_yield;
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extern uintptr libc·select;
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extern uintptr libc·sem_init;
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extern uintptr libc·sem_post;
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extern uintptr libc·sem_reltimedwait_np;
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extern uintptr libc·sem_wait;
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extern uintptr libc·setitimer;
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extern uintptr libc·sigaction;
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extern uintptr libc·sigaltstack;
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extern uintptr libc·sigprocmask;
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extern uintptr libc·sysconf;
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extern uintptr libc·usleep;
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extern uintptr libc·write;
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void runtime·getcontext(Ucontext *context);
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int32 runtime·pthread_attr_destroy(PthreadAttr* attr);
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int32 runtime·pthread_attr_init(PthreadAttr* attr);
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int32 runtime·pthread_attr_getstack(PthreadAttr* attr, void** addr, uint64* size);
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int32 runtime·pthread_attr_setdetachstate(PthreadAttr* attr, int32 state);
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int32 runtime·pthread_attr_setstack(PthreadAttr* attr, void* addr, uint64 size);
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int32 runtime·pthread_create(Pthread* thread, PthreadAttr* attr, void(*fn)(void), void *arg);
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uint32 runtime·tstart_sysvicall(M *newm);
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int32 runtime·sem_init(SemT* sem, int32 pshared, uint32 value);
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int32 runtime·sem_post(SemT* sem);
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int32 runtime·sem_reltimedwait_np(SemT* sem, Timespec* timeout);
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int32 runtime·sem_wait(SemT* sem);
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int64 runtime·sysconf(int32 name);
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extern SigTab runtime·sigtab[];
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static Sigset sigset_none;
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static Sigset sigset_all = { ~(uint32)0, ~(uint32)0, ~(uint32)0, ~(uint32)0, };
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// Calling sysvcall on os stack.
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#pragma textflag NOSPLIT
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uintptr
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runtime·sysvicall6(uintptr fn, int32 count, ...)
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{
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runtime·memclr((byte*)&m->scratch, sizeof(m->scratch));
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m->libcall.fn = (void*)fn;
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m->libcall.n = (uintptr)count;
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for(;count; count--)
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m->scratch.v[count - 1] = *((uintptr*)&count + count);
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m->libcall.args = (uintptr*)&m->scratch.v[0];
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runtime·asmcgocall(runtime·asmsysvicall6, &m->libcall);
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return m->libcall.r1;
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}
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static int32
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getncpu(void)
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{
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int32 n;
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n = (int32)runtime·sysconf(_SC_NPROCESSORS_ONLN);
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if(n < 1)
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return 1;
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return n;
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}
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void
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runtime·osinit(void)
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{
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runtime·ncpu = getncpu();
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}
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void
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runtime·newosproc(M *mp, void *stk)
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{
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PthreadAttr attr;
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Sigset oset;
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Pthread tid;
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int32 ret;
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USED(stk);
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if(runtime·pthread_attr_init(&attr) != 0)
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runtime·throw("pthread_attr_init");
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if(runtime·pthread_attr_setstack(&attr, 0, 0x200000) != 0)
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runtime·throw("pthread_attr_setstack");
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if(runtime·pthread_attr_getstack(&attr, (void**)&mp->g0->stackbase, &mp->g0->stacksize) != 0)
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runtime·throw("pthread_attr_getstack");
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if(runtime·pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED) != 0)
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runtime·throw("pthread_attr_setdetachstate");
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// Disable signals during create, so that the new thread starts
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// with signals disabled. It will enable them in minit.
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runtime·sigprocmask(SIG_SETMASK, &sigset_all, &oset);
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ret = runtime·pthread_create(&tid, &attr, (void (*)(void))runtime·tstart_sysvicall, mp);
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runtime·sigprocmask(SIG_SETMASK, &oset, nil);
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if(ret != 0) {
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runtime·printf("runtime: failed to create new OS thread (have %d already; errno=%d)\n", runtime·mcount(), ret);
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runtime·throw("runtime.newosproc");
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}
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}
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void
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runtime·get_random_data(byte **rnd, int32 *rnd_len)
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{
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static byte urandom_data[HashRandomBytes];
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int32 fd;
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fd = runtime·open("/dev/urandom", 0 /* O_RDONLY */, 0);
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if(runtime·read(fd, urandom_data, HashRandomBytes) == HashRandomBytes) {
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*rnd = urandom_data;
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*rnd_len = HashRandomBytes;
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} else {
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*rnd = nil;
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*rnd_len = 0;
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}
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runtime·close(fd);
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}
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void
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runtime·goenvs(void)
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{
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runtime·goenvs_unix();
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}
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// Called to initialize a new m (including the bootstrap m).
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// Called on the parent thread (main thread in case of bootstrap), can allocate memory.
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void
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runtime·mpreinit(M *mp)
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{
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mp->gsignal = runtime·malg(32*1024);
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}
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// Called to initialize a new m (including the bootstrap m).
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// Called on the new thread, can not allocate memory.
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void
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runtime·minit(void)
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{
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runtime·asmcgocall(runtime·miniterrno, (void *)libc·___errno);
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// Initialize signal handling
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runtime·signalstack((byte*)m->gsignal->stackguard - StackGuard, 32*1024);
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runtime·sigprocmask(SIG_SETMASK, &sigset_none, nil);
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}
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// Called from dropm to undo the effect of an minit.
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void
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runtime·unminit(void)
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{
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runtime·signalstack(nil, 0);
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}
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void
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runtime·sigpanic(void)
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{
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switch(g->sig) {
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case SIGBUS:
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if(g->sigcode0 == BUS_ADRERR && g->sigcode1 < 0x1000) {
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if(g->sigpc == 0)
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runtime·panicstring("call of nil func value");
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runtime·panicstring("invalid memory address or nil pointer dereference");
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}
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runtime·printf("unexpected fault address %p\n", g->sigcode1);
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runtime·throw("fault");
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case SIGSEGV:
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if((g->sigcode0 == 0 || g->sigcode0 == SEGV_MAPERR || g->sigcode0 == SEGV_ACCERR) && g->sigcode1 < 0x1000) {
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if(g->sigpc == 0)
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runtime·panicstring("call of nil func value");
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runtime·panicstring("invalid memory address or nil pointer dereference");
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}
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runtime·printf("unexpected fault address %p\n", g->sigcode1);
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runtime·throw("fault");
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case SIGFPE:
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switch(g->sigcode0) {
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case FPE_INTDIV:
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runtime·panicstring("integer divide by zero");
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case FPE_INTOVF:
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runtime·panicstring("integer overflow");
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}
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runtime·panicstring("floating point error");
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}
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runtime·panicstring(runtime·sigtab[g->sig].name);
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}
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uintptr
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runtime·memlimit(void)
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{
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Rlimit rl;
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extern byte text[], end[];
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uintptr used;
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if(runtime·getrlimit(RLIMIT_AS, &rl) != 0)
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return 0;
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if(rl.rlim_cur >= 0x7fffffff)
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return 0;
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// Estimate our VM footprint excluding the heap.
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// Not an exact science: use size of binary plus
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// some room for thread stacks.
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used = end - text + (64<<20);
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if(used >= rl.rlim_cur)
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return 0;
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// If there's not at least 16 MB left, we're probably
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// not going to be able to do much. Treat as no limit.
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rl.rlim_cur -= used;
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if(rl.rlim_cur < (16<<20))
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return 0;
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return rl.rlim_cur - used;
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}
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void
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runtime·setprof(bool on)
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{
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USED(on);
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}
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extern void runtime·sigtramp(void);
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void
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runtime·setsig(int32 i, GoSighandler *fn, bool restart)
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{
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Sigaction sa;
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runtime·memclr((byte*)&sa, sizeof sa);
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sa.sa_flags = SA_SIGINFO|SA_ONSTACK;
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if(restart)
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sa.sa_flags |= SA_RESTART;
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sa.sa_mask.__sigbits[0] = ~(uint32)0;
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sa.sa_mask.__sigbits[1] = ~(uint32)0;
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sa.sa_mask.__sigbits[2] = ~(uint32)0;
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sa.sa_mask.__sigbits[3] = ~(uint32)0;
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if(fn == runtime·sighandler)
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fn = (void*)runtime·sigtramp;
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*((void**)&sa._funcptr[0]) = (void*)fn;
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runtime·sigaction(i, &sa, nil);
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}
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GoSighandler*
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runtime·getsig(int32 i)
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{
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Sigaction sa;
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runtime·memclr((byte*)&sa, sizeof sa);
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runtime·sigaction(i, nil, &sa);
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if(*((void**)&sa._funcptr[0]) == runtime·sigtramp)
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return runtime·sighandler;
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return *((void**)&sa._funcptr[0]);
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}
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void
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runtime·signalstack(byte *p, int32 n)
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{
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StackT st;
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st.ss_sp = (void*)p;
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st.ss_size = n;
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st.ss_flags = 0;
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if(p == nil)
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st.ss_flags = SS_DISABLE;
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runtime·sigaltstack(&st, nil);
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}
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void
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runtime·unblocksignals(void)
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{
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runtime·sigprocmask(SIG_SETMASK, &sigset_none, nil);
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}
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#pragma textflag NOSPLIT
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uintptr
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runtime·semacreate(void)
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{
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SemT* sem;
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// Call libc's malloc rather than runtime·malloc. This will
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// allocate space on the C heap. We can't call runtime·malloc
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// here because it could cause a deadlock.
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m->libcall.fn = (void*)libc·malloc;
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m->libcall.n = 1;
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runtime·memclr((byte*)&m->scratch, sizeof(m->scratch));
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m->scratch.v[0] = (uintptr)sizeof(*sem);
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m->libcall.args = (uintptr*)&m->scratch;
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runtime·asmcgocall(runtime·asmsysvicall6, &m->libcall);
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sem = (void*)m->libcall.r1;
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if(runtime·sem_init(sem, 0, 0) != 0)
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runtime·throw("sem_init");
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return (uintptr)sem;
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}
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#pragma textflag NOSPLIT
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int32
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runtime·semasleep(int64 ns)
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{
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if(ns >= 0) {
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m->ts.tv_sec = ns / 1000000000LL;
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m->ts.tv_nsec = ns % 1000000000LL;
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m->libcall.fn = (void*)libc·sem_reltimedwait_np;
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m->libcall.n = 2;
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runtime·memclr((byte*)&m->scratch, sizeof(m->scratch));
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m->scratch.v[0] = m->waitsema;
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m->scratch.v[1] = (uintptr)&m->ts;
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m->libcall.args = (uintptr*)&m->scratch;
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runtime·asmcgocall(runtime·asmsysvicall6, &m->libcall);
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if(*m->perrno != 0) {
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if(*m->perrno == ETIMEDOUT || *m->perrno == EAGAIN || *m->perrno == EINTR)
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return -1;
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runtime·throw("sem_reltimedwait_np");
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}
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return 0;
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}
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for(;;) {
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m->libcall.fn = (void*)libc·sem_wait;
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m->libcall.n = 1;
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runtime·memclr((byte*)&m->scratch, sizeof(m->scratch));
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m->scratch.v[0] = m->waitsema;
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m->libcall.args = (uintptr*)&m->scratch;
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runtime·asmcgocall(runtime·asmsysvicall6, &m->libcall);
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if(m->libcall.r1 == 0)
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break;
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if(*m->perrno == EINTR)
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continue;
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runtime·throw("sem_wait");
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}
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return 0;
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}
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#pragma textflag NOSPLIT
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void
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runtime·semawakeup(M *mp)
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{
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SemT* sem = (SemT*)mp->waitsema;
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if(runtime·sem_post(sem) != 0)
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runtime·throw("sem_post");
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}
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int32
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runtime·close(int32 fd)
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{
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return runtime·sysvicall6(libc·close, 1, (uintptr)fd);
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}
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void
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runtime·exit(int32 r)
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{
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runtime·sysvicall6(libc·exit, 1, (uintptr)r);
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}
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/* int32 */ void
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runtime·getcontext(Ucontext* context)
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{
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runtime·sysvicall6(libc·getcontext, 1, (uintptr)context);
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}
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int32
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runtime·getrlimit(int32 res, Rlimit* rlp)
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{
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return runtime·sysvicall6(libc·getrlimit, 2, (uintptr)res, (uintptr)rlp);
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}
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uint8*
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runtime·mmap(byte* addr, uintptr len, int32 prot, int32 flags, int32 fildes, uint32 off)
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{
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return (uint8*)runtime·sysvicall6(libc·mmap, 6, (uintptr)addr, (uintptr)len, (uintptr)prot, (uintptr)flags, (uintptr)fildes, (uintptr)off);
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}
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void
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runtime·munmap(byte* addr, uintptr len)
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{
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runtime·sysvicall6(libc·munmap, 2, (uintptr)addr, (uintptr)len);
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}
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extern int64 runtime·nanotime1(void);
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#pragma textflag NOSPLIT
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int64
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runtime·nanotime(void)
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{
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return runtime·sysvicall6((uintptr)runtime·nanotime1, 0);
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}
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void
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time·now(int64 sec, int32 usec)
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{
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int64 ns;
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ns = runtime·nanotime();
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sec = ns / 1000000000LL;
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usec = ns - sec * 1000000000LL;
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FLUSH(&sec);
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FLUSH(&usec);
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}
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int32
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runtime·open(int8* path, int32 oflag, int32 mode)
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{
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return runtime·sysvicall6(libc·open, 3, (uintptr)path, (uintptr)oflag, (uintptr)mode);
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}
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int32
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runtime·pthread_attr_destroy(PthreadAttr* attr)
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{
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return runtime·sysvicall6(libc·pthread_attr_destroy, 1, (uintptr)attr);
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}
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int32
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runtime·pthread_attr_getstack(PthreadAttr* attr, void** addr, uint64* size)
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{
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return runtime·sysvicall6(libc·pthread_attr_getstack, 3, (uintptr)attr, (uintptr)addr, (uintptr)size);
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}
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int32
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runtime·pthread_attr_init(PthreadAttr* attr)
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{
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return runtime·sysvicall6(libc·pthread_attr_init, 1, (uintptr)attr);
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}
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int32
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runtime·pthread_attr_setdetachstate(PthreadAttr* attr, int32 state)
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{
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return runtime·sysvicall6(libc·pthread_attr_setdetachstate, 2, (uintptr)attr, (uintptr)state);
|
|
}
|
|
|
|
int32
|
|
runtime·pthread_attr_setstack(PthreadAttr* attr, void* addr, uint64 size)
|
|
{
|
|
return runtime·sysvicall6(libc·pthread_attr_setstack, 3, (uintptr)attr, (uintptr)addr, (uintptr)size);
|
|
}
|
|
|
|
int32
|
|
runtime·pthread_create(Pthread* thread, PthreadAttr* attr, void(*fn)(void), void *arg)
|
|
{
|
|
return runtime·sysvicall6(libc·pthread_create, 4, (uintptr)thread, (uintptr)attr, (uintptr)fn, (uintptr)arg);
|
|
}
|
|
|
|
/* int32 */ void
|
|
runtime·raise(int32 sig)
|
|
{
|
|
runtime·sysvicall6(libc·raise, 1, (uintptr)sig);
|
|
}
|
|
|
|
int32
|
|
runtime·read(int32 fd, void* buf, int32 nbyte)
|
|
{
|
|
return runtime·sysvicall6(libc·read, 3, (uintptr)fd, (uintptr)buf, (uintptr)nbyte);
|
|
}
|
|
|
|
#pragma textflag NOSPLIT
|
|
int32
|
|
runtime·sem_init(SemT* sem, int32 pshared, uint32 value)
|
|
{
|
|
return runtime·sysvicall6(libc·sem_init, 3, (uintptr)sem, (uintptr)pshared, (uintptr)value);
|
|
}
|
|
|
|
#pragma textflag NOSPLIT
|
|
int32
|
|
runtime·sem_post(SemT* sem)
|
|
{
|
|
return runtime·sysvicall6(libc·sem_post, 1, (uintptr)sem);
|
|
}
|
|
|
|
#pragma textflag NOSPLIT
|
|
int32
|
|
runtime·sem_reltimedwait_np(SemT* sem, Timespec* timeout)
|
|
{
|
|
return runtime·sysvicall6(libc·sem_reltimedwait_np, 2, (uintptr)sem, (uintptr)timeout);
|
|
}
|
|
|
|
#pragma textflag NOSPLIT
|
|
int32
|
|
runtime·sem_wait(SemT* sem)
|
|
{
|
|
return runtime·sysvicall6(libc·sem_wait, 1, (uintptr)sem);
|
|
}
|
|
|
|
/* int32 */ void
|
|
runtime·setitimer(int32 which, Itimerval* value, Itimerval* ovalue)
|
|
{
|
|
runtime·sysvicall6(libc·setitimer, 3, (uintptr)which, (uintptr)value, (uintptr)ovalue);
|
|
}
|
|
|
|
/* int32 */ void
|
|
runtime·sigaction(int32 sig, struct Sigaction* act, struct Sigaction* oact)
|
|
{
|
|
runtime·sysvicall6(libc·sigaction, 3, (uintptr)sig, (uintptr)act, (uintptr)oact);
|
|
}
|
|
|
|
/* int32 */ void
|
|
runtime·sigaltstack(Sigaltstack* ss, Sigaltstack* oss)
|
|
{
|
|
runtime·sysvicall6(libc·sigaltstack, 2, (uintptr)ss, (uintptr)oss);
|
|
}
|
|
|
|
/* int32 */ void
|
|
runtime·sigprocmask(int32 how, Sigset* set, Sigset* oset)
|
|
{
|
|
runtime·sysvicall6(libc·sigprocmask, 3, (uintptr)how, (uintptr)set, (uintptr)oset);
|
|
}
|
|
|
|
int64
|
|
runtime·sysconf(int32 name)
|
|
{
|
|
return runtime·sysvicall6(libc·sysconf, 1, (uintptr)name);
|
|
}
|
|
|
|
void
|
|
runtime·usleep(uint32 us)
|
|
{
|
|
runtime·sysvicall6(libc·usleep, 1, (uintptr)us);
|
|
}
|
|
|
|
int32
|
|
runtime·write(int32 fd, void* buf, int32 nbyte)
|
|
{
|
|
return runtime·sysvicall6(libc·write, 3, (uintptr)fd, (uintptr)buf, (uintptr)nbyte);
|
|
}
|
|
|
|
void
|
|
runtime·osyield(void)
|
|
{
|
|
runtime·sysvicall6(libc·sched_yield, 0);
|
|
}
|