summaryrefslogtreecommitdiff
path: root/src/runtime/os_openbsd.c
diff options
context:
space:
mode:
Diffstat (limited to 'src/runtime/os_openbsd.c')
-rw-r--r--src/runtime/os_openbsd.c309
1 files changed, 309 insertions, 0 deletions
diff --git a/src/runtime/os_openbsd.c b/src/runtime/os_openbsd.c
new file mode 100644
index 000000000..eebaa13ee
--- /dev/null
+++ b/src/runtime/os_openbsd.c
@@ -0,0 +1,309 @@
+// Copyright 2011 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+#include "runtime.h"
+#include "defs_GOOS_GOARCH.h"
+#include "os_GOOS.h"
+#include "signal_unix.h"
+#include "stack.h"
+#include "textflag.h"
+
+enum
+{
+ ESRCH = 3,
+ EAGAIN = 35,
+ EWOULDBLOCK = EAGAIN,
+ ENOTSUP = 91,
+
+ // From OpenBSD's sys/time.h
+ CLOCK_REALTIME = 0,
+ CLOCK_VIRTUAL = 1,
+ CLOCK_PROF = 2,
+ CLOCK_MONOTONIC = 3
+};
+
+extern SigTab runtime·sigtab[];
+
+static Sigset sigset_none;
+static Sigset sigset_all = ~(Sigset)0;
+
+extern int32 runtime·tfork(TforkT *param, uintptr psize, M *mp, G *gp, void (*fn)(void));
+extern int32 runtime·thrsleep(void *ident, int32 clock_id, void *tsp, void *lock, const int32 *abort);
+extern int32 runtime·thrwakeup(void *ident, int32 n);
+
+// From OpenBSD's <sys/sysctl.h>
+#define CTL_HW 6
+#define HW_NCPU 3
+
+static int32
+getncpu(void)
+{
+ uint32 mib[2];
+ uint32 out;
+ int32 ret;
+ uintptr nout;
+
+ // Fetch hw.ncpu via sysctl.
+ mib[0] = CTL_HW;
+ mib[1] = HW_NCPU;
+ nout = sizeof out;
+ out = 0;
+ ret = runtime·sysctl(mib, 2, (byte*)&out, &nout, nil, 0);
+ if(ret >= 0)
+ return out;
+ else
+ return 1;
+}
+
+#pragma textflag NOSPLIT
+uintptr
+runtime·semacreate(void)
+{
+ return 1;
+}
+
+#pragma textflag NOSPLIT
+int32
+runtime·semasleep(int64 ns)
+{
+ Timespec ts, *tsp = nil;
+
+ // Compute sleep deadline.
+ if(ns >= 0) {
+ int32 nsec;
+ ns += runtime·nanotime();
+ ts.tv_sec = runtime·timediv(ns, 1000000000, &nsec);
+ ts.tv_nsec = nsec; // tv_nsec is int64 on amd64
+ tsp = &ts;
+ }
+
+ for(;;) {
+ int32 ret;
+
+ // spin-mutex lock
+ while(runtime·xchg(&g->m->waitsemalock, 1))
+ runtime·osyield();
+
+ if(g->m->waitsemacount != 0) {
+ // semaphore is available.
+ g->m->waitsemacount--;
+ // spin-mutex unlock
+ runtime·atomicstore(&g->m->waitsemalock, 0);
+ return 0; // semaphore acquired
+ }
+
+ // sleep until semaphore != 0 or timeout.
+ // thrsleep unlocks m->waitsemalock.
+ ret = runtime·thrsleep(&g->m->waitsemacount, CLOCK_MONOTONIC, tsp, &g->m->waitsemalock, (int32 *)&g->m->waitsemacount);
+ if(ret == EWOULDBLOCK)
+ return -1;
+ }
+}
+
+static void badsemawakeup(void);
+
+#pragma textflag NOSPLIT
+void
+runtime·semawakeup(M *mp)
+{
+ uint32 ret;
+ void *oldptr;
+ uint32 oldscalar;
+ void (*fn)(void);
+
+ // spin-mutex lock
+ while(runtime·xchg(&mp->waitsemalock, 1))
+ runtime·osyield();
+ mp->waitsemacount++;
+ ret = runtime·thrwakeup(&mp->waitsemacount, 1);
+ if(ret != 0 && ret != ESRCH) {
+ // semawakeup can be called on signal stack.
+ // Save old ptrarg/scalararg so we can restore them.
+ oldptr = g->m->ptrarg[0];
+ oldscalar = g->m->scalararg[0];
+ g->m->ptrarg[0] = mp;
+ g->m->scalararg[0] = ret;
+ fn = badsemawakeup;
+ if(g == g->m->gsignal)
+ fn();
+ else
+ runtime·onM(&fn);
+ g->m->ptrarg[0] = oldptr;
+ g->m->scalararg[0] = oldscalar;
+ }
+ // spin-mutex unlock
+ runtime·atomicstore(&mp->waitsemalock, 0);
+}
+
+static void
+badsemawakeup(void)
+{
+ M *mp;
+ int32 ret;
+
+ mp = g->m->ptrarg[0];
+ g->m->ptrarg[0] = nil;
+ ret = g->m->scalararg[0];
+ g->m->scalararg[0] = 0;
+
+ runtime·printf("thrwakeup addr=%p sem=%d ret=%d\n", &mp->waitsemacount, mp->waitsemacount, ret);
+}
+
+void
+runtime·newosproc(M *mp, void *stk)
+{
+ TforkT param;
+ Sigset oset;
+ int32 ret;
+
+ if(0) {
+ runtime·printf(
+ "newosproc stk=%p m=%p g=%p id=%d/%d ostk=%p\n",
+ stk, mp, mp->g0, mp->id, (int32)mp->tls[0], &mp);
+ }
+
+ mp->tls[0] = mp->id; // so 386 asm can find it
+
+ param.tf_tcb = (byte*)&mp->tls[0];
+ param.tf_tid = (int32*)&mp->procid;
+ param.tf_stack = stk;
+
+ oset = runtime·sigprocmask(SIG_SETMASK, sigset_all);
+ ret = runtime·tfork(&param, sizeof(param), mp, mp->g0, runtime·mstart);
+ runtime·sigprocmask(SIG_SETMASK, oset);
+
+ if(ret < 0) {
+ runtime·printf("runtime: failed to create new OS thread (have %d already; errno=%d)\n", runtime·mcount() - 1, -ret);
+ if (ret == -ENOTSUP)
+ runtime·printf("runtime: is kern.rthreads disabled?\n");
+ runtime·throw("runtime.newosproc");
+ }
+}
+
+void
+runtime·osinit(void)
+{
+ runtime·ncpu = getncpu();
+}
+
+#pragma textflag NOSPLIT
+void
+runtime·get_random_data(byte **rnd, int32 *rnd_len)
+{
+ #pragma dataflag NOPTR
+ static byte urandom_data[HashRandomBytes];
+ int32 fd;
+ fd = runtime·open("/dev/urandom", 0 /* O_RDONLY */, 0);
+ if(runtime·read(fd, urandom_data, HashRandomBytes) == HashRandomBytes) {
+ *rnd = urandom_data;
+ *rnd_len = HashRandomBytes;
+ } else {
+ *rnd = nil;
+ *rnd_len = 0;
+ }
+ runtime·close(fd);
+}
+
+void
+runtime·goenvs(void)
+{
+ runtime·goenvs_unix();
+}
+
+// Called to initialize a new m (including the bootstrap m).
+// Called on the parent thread (main thread in case of bootstrap), can allocate memory.
+void
+runtime·mpreinit(M *mp)
+{
+ mp->gsignal = runtime·malg(32*1024);
+ mp->gsignal->m = mp;
+}
+
+// Called to initialize a new m (including the bootstrap m).
+// Called on the new thread, can not allocate memory.
+void
+runtime·minit(void)
+{
+ // Initialize signal handling
+ runtime·signalstack((byte*)g->m->gsignal->stack.lo, 32*1024);
+ runtime·sigprocmask(SIG_SETMASK, sigset_none);
+}
+
+// Called from dropm to undo the effect of an minit.
+void
+runtime·unminit(void)
+{
+ runtime·signalstack(nil, 0);
+}
+
+uintptr
+runtime·memlimit(void)
+{
+ return 0;
+}
+
+extern void runtime·sigtramp(void);
+
+typedef struct sigaction {
+ union {
+ void (*__sa_handler)(int32);
+ void (*__sa_sigaction)(int32, Siginfo*, void *);
+ } __sigaction_u; /* signal handler */
+ uint32 sa_mask; /* signal mask to apply */
+ int32 sa_flags; /* see signal options below */
+} SigactionT;
+
+void
+runtime·setsig(int32 i, GoSighandler *fn, bool restart)
+{
+ SigactionT sa;
+
+ runtime·memclr((byte*)&sa, sizeof sa);
+ sa.sa_flags = SA_SIGINFO|SA_ONSTACK;
+ if(restart)
+ sa.sa_flags |= SA_RESTART;
+ sa.sa_mask = ~0U;
+ if(fn == runtime·sighandler)
+ fn = (void*)runtime·sigtramp;
+ sa.__sigaction_u.__sa_sigaction = (void*)fn;
+ runtime·sigaction(i, &sa, nil);
+}
+
+GoSighandler*
+runtime·getsig(int32 i)
+{
+ SigactionT sa;
+
+ runtime·memclr((byte*)&sa, sizeof sa);
+ runtime·sigaction(i, nil, &sa);
+ if((void*)sa.__sigaction_u.__sa_sigaction == runtime·sigtramp)
+ return runtime·sighandler;
+ return (void*)sa.__sigaction_u.__sa_sigaction;
+}
+
+void
+runtime·signalstack(byte *p, int32 n)
+{
+ StackT st;
+
+ st.ss_sp = (void*)p;
+ st.ss_size = n;
+ st.ss_flags = 0;
+ if(p == nil)
+ st.ss_flags = SS_DISABLE;
+ runtime·sigaltstack(&st, nil);
+}
+
+void
+runtime·unblocksignals(void)
+{
+ runtime·sigprocmask(SIG_SETMASK, sigset_none);
+}
+
+#pragma textflag NOSPLIT
+int8*
+runtime·signame(int32 sig)
+{
+ return runtime·sigtab[sig].name;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-05-17 22:30:37 +0000