| // Use of this source file 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 "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_all = { ~(uint32)0, ~(uint32)0, ~(uint32)0, ~(uint32)0, }; |
| static Sigset sigset_none = { 0, 0, 0, 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; |
| |
| if(ns < 0) |
| tsp = nil; |
| else { |
| ts.tv_sec = ns / 1000000000LL; |
| ts.tv_nsec = ns % 1000000000LL; |
| tsp = &ts; |
| } |
| |
| ret = runtime·sys_umtx_op(addr, UMTX_OP_WAIT, 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 *m, G *g, void *stk, void (*fn)(void)) |
| { |
| ThrParam param; |
| Sigset oset; |
| |
| USED(fn); // thr_start assumes fn == mstart |
| USED(g); // thr_start assumes g == m->g0 |
| |
| if(0){ |
| runtime·printf("newosproc stk=%p m=%p g=%p fn=%p id=%d/%d ostk=%p\n", |
| stk, m, g, fn, m->id, m->tls[0], &m); |
| } |
| |
| runtime·sigprocmask(&sigset_all, &oset); |
| runtime·memclr((byte*)¶m, sizeof param); |
| |
| param.start_func = runtime·thr_start; |
| param.arg = m; |
| param.stack_base = (int8*)g->stackbase; |
| param.stack_size = (byte*)stk - (byte*)g->stackbase; |
| param.child_tid = (intptr*)&m->procid; |
| param.parent_tid = nil; |
| param.tls_base = (int8*)&m->tls[0]; |
| param.tls_size = sizeof m->tls; |
| |
| m->tls[0] = m->id; // so 386 asm can find it |
| |
| runtime·thr_new(¶m, sizeof param); |
| runtime·sigprocmask(&oset, nil); |
| } |
| |
| void |
| runtime·osinit(void) |
| { |
| runtime·ncpu = getncpu(); |
| } |
| |
| void |
| runtime·goenvs(void) |
| { |
| runtime·goenvs_unix(); |
| } |
| |
| // Called to initialize a new m (including the bootstrap m). |
| void |
| runtime·minit(void) |
| { |
| // Initialize signal handling |
| m->gsignal = runtime·malg(32*1024); |
| runtime·signalstack(m->gsignal->stackguard - StackGuard, 32*1024); |
| runtime·sigprocmask(&sigset_none, nil); |
| } |
| |
| 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.\n"; |
| |
| // This runs on a foreign stack, without an m or a g. No stack split. |
| #pragma textflag 7 |
| void |
| runtime·badsignal(void) |
| { |
| runtime·write(2, badsignal, sizeof badsignal - 1); |
| } |