1 files changed, 324 insertions, 0 deletions
diff --git a/src/pkg/runtime/os_freebsd.c b/src/pkg/runtime/os_freebsd.c
new file mode 100644
index 000000000..f454ab349
--- /dev/null
+++ b/src/pkg/runtime/os_freebsd.c
@@ -0,0 +1,324 @@
+// 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"
+
+extern SigTab runtime·sigtab[];
+extern int32 runtime·sys_umtx_op(uint32*, int32, uint32, void*, void*);
+
+// From FreeBSD's <sys/sysctl.h>
+#define	CTL_HW	6
+#define	HW_NCPU	3
+
+static Sigset sigset_none;
+static Sigset sigset_all = { ~(uint32)0, ~(uint32)0, ~(uint32)0, ~(uint32)0, };
+
+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;
+}
+
+// FreeBSD's umtx_op syscall is effectively the same as Linux's futex, and
+// thus the code is largely similar. See linux/thread.c and lock_futex.c for comments.
+
+void
+runtime·futexsleep(uint32 *addr, uint32 val, int64 ns)
+{
+	int32 ret;
+	Timespec ts, *tsp;
+	int64 secs;
+
+	if(ns < 0)
+		tsp = nil;
+	else {
+		secs = ns / 1000000000LL;
+		// Avoid overflow
+		if(secs > 1LL<<30)
+			secs = 1LL<<30;
+		ts.tv_sec = secs;
+		ts.tv_nsec = ns % 1000000000LL;
+		tsp = &ts;
+	}
+
+	ret = runtime·sys_umtx_op(addr, UMTX_OP_WAIT_UINT, val, nil, tsp);
+	if(ret >= 0 || ret == -EINTR)
+		return;
+
+	runtime·printf("umtx_wait addr=%p val=%d ret=%d\n", addr, val, ret);
+	*(int32*)0x1005 = 0x1005;
+}
+
+void
+runtime·futexwakeup(uint32 *addr, uint32 cnt)
+{
+	int32 ret;
+
+	ret = runtime·sys_umtx_op(addr, UMTX_OP_WAKE, cnt, nil, nil);
+	if(ret >= 0)
+		return;
+
+	runtime·printf("umtx_wake addr=%p ret=%d\n", addr, ret);
+	*(int32*)0x1006 = 0x1006;
+}
+
+void runtime·thr_start(void*);
+
+void
+runtime·newosproc(M *mp, void *stk)
+{
+	ThrParam param;
+	Sigset oset;
+
+	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);
+	}
+
+	runtime·sigprocmask(&sigset_all, &oset);
+	runtime·memclr((byte*)&param, sizeof param);
+
+	param.start_func = runtime·thr_start;
+	param.arg = (byte*)mp;
+	
+	// NOTE(rsc): This code is confused. stackbase is the top of the stack
+	// and is equal to stk. However, it's working, so I'm not changing it.
+	param.stack_base = (void*)mp->g0->stackbase;
+	param.stack_size = (byte*)stk - (byte*)mp->g0->stackbase;
+
+	param.child_tid = (intptr*)&mp->procid;
+	param.parent_tid = nil;
+	param.tls_base = (void*)&mp->tls[0];
+	param.tls_size = sizeof mp->tls;
+
+	mp->tls[0] = mp->id;	// so 386 asm can find it
+
+	runtime·thr_new(&param, sizeof param);
+	runtime·sigprocmask(&oset, nil);
+}
+
+void
+runtime·osinit(void)
+{
+	runtime·ncpu = getncpu();
+}
+
+void
+runtime·get_random_data(byte **rnd, int32 *rnd_len)
+{
+	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);
+}
+
+// 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*)m->gsignal->stackguard - StackGuard, 32*1024);
+	runtime·sigprocmask(&sigset_none, nil);
+}
+
+// Called from dropm to undo the effect of an minit.
+void
+runtime·unminit(void)
+{
+	runtime·signalstack(nil, 0);
+}
+
+void
+runtime·sigpanic(void)
+{
+	switch(g->sig) {
+	case SIGBUS:
+		if(g->sigcode0 == BUS_ADRERR && g->sigcode1 < 0x1000) {
+			if(g->sigpc == 0)
+				runtime·panicstring("call of nil func value");
+			runtime·panicstring("invalid memory address or nil pointer dereference");
+		}
+		runtime·printf("unexpected fault address %p\n", g->sigcode1);
+		runtime·throw("fault");
+	case SIGSEGV:
+		if((g->sigcode0 == 0 || g->sigcode0 == SEGV_MAPERR || g->sigcode0 == SEGV_ACCERR) && g->sigcode1 < 0x1000) {
+			if(g->sigpc == 0)
+				runtime·panicstring("call of nil func value");
+			runtime·panicstring("invalid memory address or nil pointer dereference");
+		}
+		runtime·printf("unexpected fault address %p\n", g->sigcode1);
+		runtime·throw("fault");
+	case SIGFPE:
+		switch(g->sigcode0) {
+		case FPE_INTDIV:
+			runtime·panicstring("integer divide by zero");
+		case FPE_INTOVF:
+			runtime·panicstring("integer overflow");
+		}
+		runtime·panicstring("floating point error");
+	}
+	runtime·panicstring(runtime·sigtab[g->sig].name);
+}
+
+uintptr
+runtime·memlimit(void)
+{
+	Rlimit rl;
+	extern byte text[], end[];
+	uintptr used;
+	
+	if(runtime·getrlimit(RLIMIT_AS, &rl) != 0)
+		return 0;
+	if(rl.rlim_cur >= 0x7fffffff)
+		return 0;
+
+	// Estimate our VM footprint excluding the heap.
+	// Not an exact science: use size of binary plus
+	// some room for thread stacks.
+	used = end - text + (64<<20);
+	if(used >= rl.rlim_cur)
+		return 0;
+
+	// If there's not at least 16 MB left, we're probably
+	// not going to be able to do much.  Treat as no limit.
+	rl.rlim_cur -= used;
+	if(rl.rlim_cur < (16<<20))
+		return 0;
+
+	return rl.rlim_cur - used;
+}
+
+void
+runtime·setprof(bool on)
+{
+	USED(on);
+}
+
+static int8 badcallback[] = "runtime: cgo callback on thread not created by Go.\n";
+
+// This runs on a foreign stack, without an m or a g.  No stack split.
+#pragma textflag 7
+void
+runtime·badcallback(void)
+{
+	runtime·write(2, badcallback, sizeof badcallback - 1);
+}
+
+static int8 badsignal[] = "runtime: signal received on thread not created by Go: ";
+
+// This runs on a foreign stack, without an m or a g.  No stack split.
+#pragma textflag 7
+void
+runtime·badsignal(int32 sig)
+{
+	int32 len;
+
+	if (sig == SIGPROF) {
+		return;  // Ignore SIGPROFs intended for a non-Go thread.
+	}
+	runtime·write(2, badsignal, sizeof badsignal - 1);
+	if (0 <= sig && sig < NSIG) {
+		// Can't call findnull() because it will split stack.
+		for(len = 0; runtime·sigtab[sig].name[len]; len++)
+			;
+		runtime·write(2, runtime·sigtab[sig].name, len);
+	}
+	runtime·write(2, "\n", 1);
+	runtime·exit(1);
+}
+
+extern void runtime·sigtramp(void);
+
+typedef struct sigaction {
+	union {
+		void    (*__sa_handler)(int32);
+		void    (*__sa_sigaction)(int32, Siginfo*, void *);
+	} __sigaction_u;		/* signal handler */
+	int32	sa_flags;		/* see signal options below */
+	Sigset	sa_mask;		/* signal mask to apply */
+} Sigaction;
+
+void
+runtime·setsig(int32 i, GoSighandler *fn, bool restart)
+{
+	Sigaction sa;
+
+	runtime·memclr((byte*)&sa, sizeof sa);
+	sa.sa_flags = SA_SIGINFO|SA_ONSTACK;
+	if(restart)
+		sa.sa_flags |= SA_RESTART;
+	sa.sa_mask.__bits[0] = ~(uint32)0;
+	sa.sa_mask.__bits[1] = ~(uint32)0;
+	sa.sa_mask.__bits[2] = ~(uint32)0;
+	sa.sa_mask.__bits[3] = ~(uint32)0;
+	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)
+{
+	Sigaction 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);
+}