| // Copyright 2009 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 <pthread.h> |
| #include <string.h> |
| #include "libcgo.h" |
| |
| static void *threadentry(void*); |
| |
| static void |
| xinitcgo(void) |
| { |
| } |
| |
| void (*initcgo) = xinitcgo; |
| |
| void |
| libcgo_sys_thread_start(ThreadStart *ts) |
| { |
| pthread_attr_t attr; |
| pthread_t p; |
| size_t size; |
| |
| // Not sure why the memset is necessary here, |
| // but without it, we get a bogus stack size |
| // out of pthread_attr_getstacksize. C'est la Linux. |
| memset(&attr, 0, sizeof attr); |
| pthread_attr_init(&attr); |
| size = 0; |
| pthread_attr_getstacksize(&attr, &size); |
| ts->g->stackguard = size; |
| pthread_create(&p, &attr, threadentry, ts); |
| } |
| |
| static void* |
| threadentry(void *v) |
| { |
| ThreadStart ts; |
| |
| ts = *(ThreadStart*)v; |
| free(v); |
| |
| ts.g->stackbase = (uintptr)&ts; |
| |
| /* |
| * libcgo_sys_thread_start set stackguard to stack size; |
| * change to actual guard pointer. |
| */ |
| ts.g->stackguard = (uintptr)&ts - ts.g->stackguard + 4096; |
| |
| /* |
| * Set specific keys. On Linux/ELF, the thread local storage |
| * is just before %gs:0. Our dynamic 8.out's reserve 8 bytes |
| * for the two words g and m at %gs:-8 and %gs:-4. |
| * Xen requires us to access those words indirect from %gs:0 |
| * which points at itself. |
| */ |
| asm volatile ( |
| "movl %%gs:0, %%eax\n" // MOVL 0(GS), tmp |
| "movl %0, -8(%%eax)\n" // MOVL g, -8(GS) |
| "movl %1, -4(%%eax)\n" // MOVL m, -4(GS) |
| :: "r"(ts.g), "r"(ts.m) : "%eax" |
| ); |
| |
| crosscall_386(ts.fn); |
| return nil; |
| } |