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1.1 |
/* |
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1.28 |
* Copyright (c) 2001-2008 Marc Alexander Lehmann <schmorp@schmorp.de> |
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1.1 |
* |
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* Redistribution and use in source and binary forms, with or without modifica- |
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* tion, are permitted provided that the following conditions are met: |
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* |
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* 1. Redistributions of source code must retain the above copyright notice, |
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* this list of conditions and the following disclaimer. |
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* |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in the |
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* documentation and/or other materials provided with the distribution. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED |
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER- |
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* CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO |
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* EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE- |
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* CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; |
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH- |
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* ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED |
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* OF THE POSSIBILITY OF SUCH DAMAGE. |
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* |
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1.29 |
* Alternatively, the contents of this file may be used under the terms of |
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* the GNU General Public License ("GPL") version 2 or any later version, |
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* in which case the provisions of the GPL are applicable instead of |
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* the above. If you wish to allow the use of your version of this file |
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* only under the terms of the GPL and not to allow others to use your |
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* version of this file under the BSD license, indicate your decision |
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* by deleting the provisions above and replace them with the notice |
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* and other provisions required by the GPL. If you do not delete the |
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* provisions above, a recipient may use your version of this file under |
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* either the BSD or the GPL. |
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* |
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1.1 |
* This library is modelled strictly after Ralf S. Engelschalls article at |
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1.29 |
* http://www.gnu.org/software/pth/rse-pmt.ps. So most of the credit must |
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1.1 |
* go to Ralf S. Engelschall <rse@engelschall.com>. |
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*/ |
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#include "coro.h" |
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1.8 |
#if !defined(STACK_ADJUST_PTR) |
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1.5 |
/* IRIX is decidedly NON-unix */ |
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1.8 |
# if __sgi |
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# define STACK_ADJUST_PTR(sp,ss) ((char *)(sp) + (ss) - 8) |
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# define STACK_ADJUST_SIZE(sp,ss) ((ss) - 8) |
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1.31 |
# elif (__i386__ && CORO_LINUX) || (_M_IX86 && CORO_LOSER) |
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1.8 |
# define STACK_ADJUST_PTR(sp,ss) ((char *)(sp) + (ss)) |
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# define STACK_ADJUST_SIZE(sp,ss) (ss) |
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1.31 |
# elif (__amd64__ && CORO_LINUX) || ((_M_AMD64 || _M_IA64) && CORO_LOSER) |
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# define STACK_ADJUST_PTR(sp,ss) ((char *)(sp) + (ss) - 8) |
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# define STACK_ADJUST_SIZE(sp,ss) (ss) |
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1.8 |
# else |
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# define STACK_ADJUST_PTR(sp,ss) (sp) |
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# define STACK_ADJUST_SIZE(sp,ss) (ss) |
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# endif |
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1.5 |
#endif |
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1.7 |
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1.20 |
#if CORO_UCONTEXT |
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# include <stddef.h> |
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#endif |
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1.27 |
#if CORO_SJLJ || CORO_LOSER || CORO_LINUX || CORO_IRIX || CORO_ASM |
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1.1 |
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1.17 |
#include <stdlib.h> |
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1.14 |
#if CORO_SJLJ |
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1.15 |
# include <stdio.h> |
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1.14 |
# include <signal.h> |
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1.17 |
# include <unistd.h> |
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#endif |
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static volatile coro_func coro_init_func; |
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static volatile void *coro_init_arg; |
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static volatile coro_context *new_coro, *create_coro; |
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1.25 |
/* what we really want to detect here is wether we use a new-enough version of GAS */ |
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1.28 |
/* instead, check for gcc 3, ELF and GNU/Linux and hope for the best */ |
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#if __GNUC__ >= 3 && __ELF__ && __linux__ |
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1.25 |
# define HAVE_CFI 1 |
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#endif |
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1.1 |
static void |
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coro_init (void) |
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{ |
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volatile coro_func func = coro_init_func; |
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volatile void *arg = coro_init_arg; |
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1.2 |
coro_transfer ((coro_context *)new_coro, (coro_context *)create_coro); |
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1.1 |
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1.3 |
func ((void *)arg); |
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1.1 |
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/* the new coro returned. bad. just abort() for now */ |
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abort (); |
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} |
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# if CORO_SJLJ |
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static volatile int trampoline_count; |
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/* trampoline signal handler */ |
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static void |
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1.14 |
trampoline (int sig) |
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1.1 |
{ |
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1.3 |
if (setjmp (((coro_context *)new_coro)->env)) |
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1.26 |
{ |
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#if HAVE_CFI |
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asm (".cfi_startproc"); |
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#endif |
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coro_init (); /* start it */ |
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#if HAVE_CFI |
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asm (".cfi_endproc"); |
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#endif |
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} |
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1.1 |
else |
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trampoline_count++; |
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} |
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# endif |
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#endif |
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1.27 |
#if CORO_ASM |
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1.32 |
void __attribute__((__noinline__, __regparm__(2))) |
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1.27 |
coro_transfer (struct coro_context *prev, struct coro_context *next) |
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{ |
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asm volatile ( |
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#if __amd64 |
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1.32 |
# define NUM_SAVED 5 |
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1.27 |
"push %%rbx\n\t" |
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"push %%r12\n\t" |
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"push %%r13\n\t" |
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"push %%r14\n\t" |
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"push %%r15\n\t" |
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"mov %%rsp, %0\n\t" |
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"mov %1, %%rsp\n\t" |
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"pop %%r15\n\t" |
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"pop %%r14\n\t" |
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"pop %%r13\n\t" |
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"pop %%r12\n\t" |
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"pop %%rbx\n\t" |
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#elif __i386 |
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1.32 |
# define NUM_SAVED 4 |
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1.27 |
"push %%ebx\n\t" |
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"push %%esi\n\t" |
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"push %%edi\n\t" |
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"push %%ebp\n\t" |
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"mov %%esp, %0\n\t" |
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"mov %1, %%esp\n\t" |
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"pop %%ebp\n\t" |
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"pop %%edi\n\t" |
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"pop %%esi\n\t" |
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"pop %%ebx\n\t" |
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#else |
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# error unsupported architecture |
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#endif |
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: "=m" (prev->sp) |
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: "m" (next->sp) |
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); |
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} |
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#endif |
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1.30 |
#if CORO_PTHREAD |
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struct coro_init_args { |
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coro_func func; |
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void *arg; |
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coro_context *self, *main; |
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}; |
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pthread_mutex_t coro_mutex = PTHREAD_MUTEX_INITIALIZER; |
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static void * |
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trampoline (void *args_) |
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{ |
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struct coro_init_args *args = (struct coro_init_args *)args_; |
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coro_func func = args->func; |
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void *arg = args->arg; |
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pthread_mutex_lock (&coro_mutex); |
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pthread_cond_destroy (&args->self->c); |
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coro_transfer (args->self, args->main); |
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func (arg); |
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pthread_mutex_unlock (&coro_mutex); |
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return 0; |
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} |
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void coro_transfer(coro_context *prev, coro_context *next) |
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{ |
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pthread_cond_init (&prev->c, 0); |
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pthread_cond_signal (&next->c); |
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pthread_cond_wait (&prev->c, &coro_mutex); |
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pthread_cond_destroy (&prev->c); |
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} |
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#endif |
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1.1 |
/* initialize a machine state */ |
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1.23 |
void coro_create (coro_context *ctx, |
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coro_func coro, void *arg, |
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void *sptr, long ssize) |
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1.1 |
{ |
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#if CORO_UCONTEXT |
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getcontext (&(ctx->uc)); |
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1.5 |
ctx->uc.uc_link = 0; |
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1.9 |
ctx->uc.uc_stack.ss_sp = STACK_ADJUST_PTR (sptr,ssize); |
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1.8 |
ctx->uc.uc_stack.ss_size = (size_t) STACK_ADJUST_SIZE (sptr,ssize); |
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1.1 |
ctx->uc.uc_stack.ss_flags = 0; |
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makecontext (&(ctx->uc), (void (*)()) coro, 1, arg); |
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1.27 |
#elif CORO_SJLJ || CORO_LOSER || CORO_LINUX || CORO_IRIX || CORO_ASM |
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1.1 |
|
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# if CORO_SJLJ |
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stack_t ostk, nstk; |
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struct sigaction osa, nsa; |
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sigset_t nsig, osig; |
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# endif |
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coro_context nctx; |
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coro_init_func = coro; |
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coro_init_arg = arg; |
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new_coro = ctx; |
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create_coro = &nctx; |
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# if CORO_SJLJ |
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/* we use SIGUSR2. first block it, then fiddle with it. */ |
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sigemptyset (&nsig); |
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sigaddset (&nsig, SIGUSR2); |
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sigprocmask (SIG_BLOCK, &nsig, &osig); |
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nsa.sa_handler = trampoline; |
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sigemptyset (&nsa.sa_mask); |
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nsa.sa_flags = SA_ONSTACK; |
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if (sigaction (SIGUSR2, &nsa, &osa)) |
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root |
1.23 |
{ |
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perror ("sigaction"); |
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abort (); |
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} |
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root |
1.1 |
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/* set the new stack */ |
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root |
1.9 |
nstk.ss_sp = STACK_ADJUST_PTR (sptr,ssize); /* yes, some platforms (IRIX) get this wrong. */ |
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1.8 |
nstk.ss_size = STACK_ADJUST_SIZE (sptr,ssize); |
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1.1 |
nstk.ss_flags = 0; |
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if (sigaltstack (&nstk, &ostk) < 0) |
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root |
1.23 |
{ |
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perror ("sigaltstack"); |
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abort (); |
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} |
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1.1 |
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trampoline_count = 0; |
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kill (getpid (), SIGUSR2); |
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sigfillset (&nsig); sigdelset (&nsig, SIGUSR2); |
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263 |
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while (!trampoline_count) |
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sigsuspend (&nsig); |
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266 |
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sigaltstack (0, &nstk); |
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nstk.ss_flags = SS_DISABLE; |
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if (sigaltstack (&nstk, 0) < 0) |
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perror ("sigaltstack"); |
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271 |
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sigaltstack (0, &nstk); |
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if (~nstk.ss_flags & SS_DISABLE) |
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abort (); |
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if (~ostk.ss_flags & SS_DISABLE) |
276 |
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sigaltstack (&ostk, 0); |
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278 |
root |
1.19 |
sigaction (SIGUSR2, &osa, 0); |
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root |
1.1 |
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280 |
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sigprocmask (SIG_SETMASK, &osig, 0); |
281 |
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282 |
root |
1.16 |
# elif CORO_LOSER |
283 |
root |
1.1 |
|
284 |
root |
1.4 |
setjmp (ctx->env); |
285 |
root |
1.21 |
#if __CYGWIN__ |
286 |
pcg |
1.11 |
ctx->env[7] = (long)((char *)sptr + ssize); |
287 |
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ctx->env[8] = (long)coro_init; |
288 |
root |
1.21 |
#elif defined(_M_IX86) |
289 |
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((_JUMP_BUFFER *)&ctx->env)->Eip = (long)coro_init; |
290 |
root |
1.31 |
((_JUMP_BUFFER *)&ctx->env)->Esp = (long)STACK_ADJUST_PTR (sptr, ssize); |
291 |
root |
1.21 |
#elif defined(_M_AMD64) |
292 |
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((_JUMP_BUFFER *)&ctx->env)->Rip = (__int64)coro_init; |
293 |
root |
1.31 |
((_JUMP_BUFFER *)&ctx->env)->Rsp = (__int64)STACK_ADJUST_PTR (sptr, ssize); |
294 |
root |
1.21 |
#elif defined(_M_IA64) |
295 |
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((_JUMP_BUFFER *)&ctx->env)->StIIP = (__int64)coro_init; |
296 |
root |
1.31 |
((_JUMP_BUFFER *)&ctx->env)->IntSp = (__int64)STACK_ADJUST_PTR (sptr, ssize); |
297 |
root |
1.21 |
#else |
298 |
root |
1.30 |
# error "microsoft libc or architecture not supported" |
299 |
root |
1.21 |
#endif |
300 |
root |
1.4 |
|
301 |
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# elif CORO_LINUX |
302 |
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303 |
root |
1.22 |
_setjmp (ctx->env); |
304 |
root |
1.24 |
#if __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 0 && defined (JB_PC) && defined (JB_SP) |
305 |
root |
1.10 |
ctx->env[0].__jmpbuf[JB_PC] = (long)coro_init; |
306 |
root |
1.24 |
ctx->env[0].__jmpbuf[JB_SP] = (long)STACK_ADJUST_PTR (sptr, ssize); |
307 |
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#elif __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 0 && defined (__mc68000__) |
308 |
root |
1.4 |
ctx->env[0].__jmpbuf[0].__aregs[0] = (long int)coro_init; |
309 |
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ctx->env[0].__jmpbuf[0].__sp = (int *)((char *)sptr + ssize); |
310 |
root |
1.24 |
#elif defined (__GNU_LIBRARY__) && defined (__i386__) |
311 |
root |
1.4 |
ctx->env[0].__jmpbuf[0].__pc = (char *)coro_init; |
312 |
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ctx->env[0].__jmpbuf[0].__sp = (void *)((char *)sptr + ssize); |
313 |
root |
1.24 |
#elif defined (__GNU_LIBRARY__) && defined (__amd64__) |
314 |
root |
1.12 |
ctx->env[0].__jmpbuf[JB_PC] = (long)coro_init; |
315 |
root |
1.24 |
ctx->env[0].__jmpbuf[JB_RSP] = (long)STACK_ADJUST_PTR (sptr, ssize); |
316 |
root |
1.4 |
#else |
317 |
root |
1.27 |
# error "linux libc or architecture not supported" |
318 |
root |
1.4 |
#endif |
319 |
root |
1.5 |
|
320 |
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# elif CORO_IRIX |
321 |
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322 |
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setjmp (ctx->env); |
323 |
root |
1.6 |
ctx->env[JB_PC] = (__uint64_t)coro_init; |
324 |
root |
1.24 |
ctx->env[JB_SP] = (__uint64_t)STACK_ADJUST_PTR (sptr, ssize); |
325 |
root |
1.1 |
|
326 |
root |
1.27 |
# elif CORO_ASM |
327 |
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328 |
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ctx->sp = (volatile void **)(ssize + (char *)sptr); |
329 |
root |
1.33 |
/* we try to allow for both functions with and without frame pointers */ |
330 |
root |
1.27 |
*--ctx->sp = (void *)coro_init; |
331 |
root |
1.33 |
{ |
332 |
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void **frame = ctx->sp - 1; |
333 |
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int i; |
334 |
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for (i = NUM_SAVED; i--; ) |
335 |
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*--ctx->sp = frame; |
336 |
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} |
337 |
root |
1.27 |
|
338 |
root |
1.1 |
# endif |
339 |
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|
340 |
root |
1.2 |
coro_transfer ((coro_context *)create_coro, (coro_context *)new_coro); |
341 |
root |
1.1 |
|
342 |
root |
1.30 |
# elif CORO_PTHREAD |
343 |
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|
344 |
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pthread_t id; |
345 |
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pthread_attr_t attr; |
346 |
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coro_context nctx; |
347 |
|
|
struct coro_init_args args; |
348 |
|
|
static int once; |
349 |
|
|
|
350 |
|
|
if (!once) |
351 |
|
|
{ |
352 |
|
|
pthread_mutex_lock (&coro_mutex); |
353 |
|
|
once = 1; |
354 |
|
|
} |
355 |
|
|
|
356 |
|
|
args.func = coro; |
357 |
|
|
args.arg = arg; |
358 |
|
|
args.self = ctx; |
359 |
|
|
args.main = &nctx; |
360 |
|
|
|
361 |
|
|
pthread_attr_init (&attr); |
362 |
|
|
pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED); |
363 |
|
|
pthread_attr_setstack (&attr, sptr, (size_t)ssize); |
364 |
|
|
pthread_create (&id, &attr, trampoline, &args); |
365 |
|
|
|
366 |
|
|
pthread_cond_init (&args.self->c, 0); |
367 |
|
|
coro_transfer (args.main, args.self); |
368 |
|
|
|
369 |
root |
1.1 |
#else |
370 |
root |
1.30 |
# error unsupported backend |
371 |
root |
1.1 |
#endif |
372 |
|
|
} |
373 |
|
|
|