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/* |
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* Copyright (c) 2001-2011 Marc Alexander Lehmann <schmorp@schmorp.de> |
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* |
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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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* 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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* This library is modelled strictly after Ralf S. Engelschalls article at |
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* http://www.gnu.org/software/pth/rse-pmt.ps. So most of the credit must |
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* go to Ralf S. Engelschall <rse@engelschall.com>. |
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*/ |
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|
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#include "coro.h" |
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|
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#include <string.h> |
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|
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/*****************************************************************************/ |
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/* ucontext/setjmp/asm backends */ |
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/*****************************************************************************/ |
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#if CORO_UCONTEXT || CORO_SJLJ || CORO_LOSER || CORO_LINUX || CORO_IRIX || CORO_ASM |
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|
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# if CORO_UCONTEXT |
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# include <stddef.h> |
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# endif |
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|
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# if !defined(STACK_ADJUST_PTR) |
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# if __sgi |
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/* IRIX is decidedly NON-unix */ |
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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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# elif (__i386__ && CORO_LINUX) || (_M_IX86 && CORO_LOSER) |
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# define STACK_ADJUST_PTR(sp,ss) ((char *)(sp) + (ss)) |
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# define STACK_ADJUST_SIZE(sp,ss) (ss) |
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# 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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# 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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# endif |
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|
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# include <stdlib.h> |
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|
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# if CORO_SJLJ |
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# include <stdio.h> |
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# include <signal.h> |
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# include <unistd.h> |
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# endif |
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|
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static coro_func coro_init_func; |
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static void *coro_init_arg; |
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static coro_context *new_coro, *create_coro; |
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|
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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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|
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coro_transfer (new_coro, create_coro); |
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|
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#if __GCC_HAVE_DWARF2_CFI_ASM && __amd64 |
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asm (".cfi_undefined rip"); |
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#endif |
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|
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func ((void *)arg); |
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|
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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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|
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# if CORO_SJLJ |
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|
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static volatile int trampoline_done; |
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|
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/* trampoline signal handler */ |
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static void |
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trampoline (int sig) |
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{ |
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if (coro_setjmp (new_coro->env)) |
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coro_init (); /* start it */ |
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else |
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trampoline_done = 1; |
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} |
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|
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# endif |
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|
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# if CORO_ASM |
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|
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#if _WIN32 || __CYGWIN__ |
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#define CORO_WIN_TIB 1 |
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#endif |
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|
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asm ( |
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"\t.text\n" |
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#if _WIN32 || __CYGWIN__ |
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"\t.globl _coro_transfer\n" |
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"_coro_transfer:\n" |
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#else |
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"\t.globl coro_transfer\n" |
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"coro_transfer:\n" |
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#endif |
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/* windows, of course, gives a shit on the amd64 ABI and uses different registers */ |
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/* http://blogs.msdn.com/freik/archive/2005/03/17/398200.aspx */ |
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#if __amd64 |
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|
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#if _WIN32 || __CYGWIN__ |
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#define NUM_SAVED 29 |
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"\tsubq $168, %rsp\t" /* one dummy qword to improve alignment */ |
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"\tmovaps %xmm6, (%rsp)\n" |
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"\tmovaps %xmm7, 16(%rsp)\n" |
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"\tmovaps %xmm8, 32(%rsp)\n" |
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"\tmovaps %xmm9, 48(%rsp)\n" |
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"\tmovaps %xmm10, 64(%rsp)\n" |
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"\tmovaps %xmm11, 80(%rsp)\n" |
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"\tmovaps %xmm12, 96(%rsp)\n" |
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"\tmovaps %xmm13, 112(%rsp)\n" |
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"\tmovaps %xmm14, 128(%rsp)\n" |
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"\tmovaps %xmm15, 144(%rsp)\n" |
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"\tpushq %rsi\n" |
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"\tpushq %rdi\n" |
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"\tpushq %rbp\n" |
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"\tpushq %rbx\n" |
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"\tpushq %r12\n" |
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"\tpushq %r13\n" |
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"\tpushq %r14\n" |
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"\tpushq %r15\n" |
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#if CORO_WIN_TIB |
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"\tpushq %fs:0x0\n" |
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"\tpushq %fs:0x8\n" |
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"\tpushq %fs:0xc\n" |
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#endif |
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"\tmovq %rsp, (%rcx)\n" |
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"\tmovq (%rdx), %rsp\n" |
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#if CORO_WIN_TIB |
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"\tpopq %fs:0xc\n" |
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"\tpopq %fs:0x8\n" |
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"\tpopq %fs:0x0\n" |
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#endif |
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"\tpopq %r15\n" |
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"\tpopq %r14\n" |
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"\tpopq %r13\n" |
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"\tpopq %r12\n" |
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"\tpopq %rbx\n" |
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"\tpopq %rbp\n" |
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"\tpopq %rdi\n" |
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"\tpopq %rsi\n" |
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"\tmovaps (%rsp), %xmm6\n" |
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"\tmovaps 16(%rsp), %xmm7\n" |
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"\tmovaps 32(%rsp), %xmm8\n" |
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"\tmovaps 48(%rsp), %xmm9\n" |
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"\tmovaps 64(%rsp), %xmm10\n" |
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"\tmovaps 80(%rsp), %xmm11\n" |
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"\tmovaps 96(%rsp), %xmm12\n" |
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"\tmovaps 112(%rsp), %xmm13\n" |
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"\tmovaps 128(%rsp), %xmm14\n" |
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"\tmovaps 144(%rsp), %xmm15\n" |
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"\taddq $168, %rsp\n" |
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#else |
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#define NUM_SAVED 6 |
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"\tpushq %rbp\n" |
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"\tpushq %rbx\n" |
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"\tpushq %r12\n" |
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"\tpushq %r13\n" |
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"\tpushq %r14\n" |
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"\tpushq %r15\n" |
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"\tmovq %rsp, (%rdi)\n" |
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"\tmovq (%rsi), %rsp\n" |
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"\tpopq %r15\n" |
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"\tpopq %r14\n" |
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"\tpopq %r13\n" |
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"\tpopq %r12\n" |
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"\tpopq %rbx\n" |
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"\tpopq %rbp\n" |
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#endif |
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"\tpopq %rcx\n" |
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"\tjmpq *%rcx\n" |
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|
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#elif __i386 |
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|
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#define NUM_SAVED 4 |
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"\tpushl %ebp\n" |
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"\tpushl %ebx\n" |
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"\tpushl %esi\n" |
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"\tpushl %edi\n" |
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#if CORO_WIN_TIB |
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#undef NUM_SAVED |
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#define NUM_SAVED 7 |
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"\tpushl %fs:0\n" |
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"\tpushl %fs:4\n" |
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"\tpushl %fs:8\n" |
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#endif |
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"\tmovl %esp, (%eax)\n" |
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"\tmovl (%edx), %esp\n" |
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#if CORO_WIN_TIB |
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"\tpopl %fs:8\n" |
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"\tpopl %fs:4\n" |
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"\tpopl %fs:0\n" |
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#endif |
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"\tpopl %edi\n" |
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"\tpopl %esi\n" |
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"\tpopl %ebx\n" |
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"\tpopl %ebp\n" |
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"\tpopl %ecx\n" |
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"\tjmpl *%ecx\n" |
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|
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#else |
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#error unsupported architecture |
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#endif |
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); |
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|
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# endif |
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|
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void |
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coro_create (coro_context *ctx, coro_func coro, void *arg, void *sptr, long ssize) |
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{ |
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coro_context nctx; |
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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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|
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if (!coro) |
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return; |
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|
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coro_init_func = coro; |
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coro_init_arg = arg; |
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|
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new_coro = ctx; |
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create_coro = &nctx; |
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|
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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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|
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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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|
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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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|
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if (sigaction (SIGUSR2, &nsa, &osa)) |
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{ |
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perror ("sigaction"); |
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abort (); |
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} |
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|
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/* set the new stack */ |
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nstk.ss_sp = STACK_ADJUST_PTR (sptr, ssize); /* yes, some platforms (IRIX) get this wrong. */ |
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nstk.ss_size = STACK_ADJUST_SIZE (sptr, ssize); |
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nstk.ss_flags = 0; |
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|
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if (sigaltstack (&nstk, &ostk) < 0) |
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{ |
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perror ("sigaltstack"); |
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abort (); |
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} |
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|
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trampoline_done = 0; |
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kill (getpid (), SIGUSR2); |
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sigfillset (&nsig); sigdelset (&nsig, SIGUSR2); |
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|
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while (!trampoline_done) |
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sigsuspend (&nsig); |
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|
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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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|
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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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|
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if (~ostk.ss_flags & SS_DISABLE) |
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sigaltstack (&ostk, 0); |
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|
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sigaction (SIGUSR2, &osa, 0); |
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sigprocmask (SIG_SETMASK, &osig, 0); |
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|
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# elif CORO_LOSER |
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|
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coro_setjmp (ctx->env); |
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#if __CYGWIN__ && __i386 |
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ctx->env[8] = (long) coro_init; |
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ctx->env[7] = (long) ((char *)sptr + ssize) - sizeof (long); |
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#elif __CYGWIN__ && __x86_64 |
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ctx->env[7] = (long) coro_init; |
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ctx->env[6] = (long) ((char *)sptr + ssize) - sizeof (long); |
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#elif defined __MINGW32__ |
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ctx->env[5] = (long) coro_init; |
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ctx->env[4] = (long) ((char *)sptr + ssize) - sizeof (long); |
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#elif defined _M_IX86 |
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((_JUMP_BUFFER *)&ctx->env)->Eip = (long) coro_init; |
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((_JUMP_BUFFER *)&ctx->env)->Esp = (long) STACK_ADJUST_PTR (sptr, ssize) - sizeof (long); |
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#elif defined _M_AMD64 |
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((_JUMP_BUFFER *)&ctx->env)->Rip = (__int64) coro_init; |
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((_JUMP_BUFFER *)&ctx->env)->Rsp = (__int64) STACK_ADJUST_PTR (sptr, ssize) - sizeof (__int64); |
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#elif defined _M_IA64 |
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((_JUMP_BUFFER *)&ctx->env)->StIIP = (__int64) coro_init; |
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((_JUMP_BUFFER *)&ctx->env)->IntSp = (__int64) STACK_ADJUST_PTR (sptr, ssize) - sizeof (__int64); |
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#else |
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#error "microsoft libc or architecture not supported" |
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#endif |
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|
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# elif CORO_LINUX |
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|
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coro_setjmp (ctx->env); |
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#if __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 0 && defined (JB_PC) && defined (JB_SP) |
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ctx->env[0].__jmpbuf[JB_PC] = (long) coro_init; |
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ctx->env[0].__jmpbuf[JB_SP] = (long) STACK_ADJUST_PTR (sptr, ssize) - sizeof (long); |
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#elif __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 0 && defined (__mc68000__) |
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ctx->env[0].__jmpbuf[0].__aregs[0] = (long int)coro_init; |
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ctx->env[0].__jmpbuf[0].__sp = (int *) ((char *)sptr + ssize) - sizeof (long); |
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#elif defined (__GNU_LIBRARY__) && defined (__i386__) |
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ctx->env[0].__jmpbuf[0].__pc = (char *) coro_init; |
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ctx->env[0].__jmpbuf[0].__sp = (void *) ((char *)sptr + ssize) - sizeof (long); |
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#elif defined (__GNU_LIBRARY__) && defined (__amd64__) |
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ctx->env[0].__jmpbuf[JB_PC] = (long) coro_init; |
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ctx->env[0].__jmpbuf[0].__sp = (void *) ((char *)sptr + ssize) - sizeof (long); |
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#else |
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#error "linux libc or architecture not supported" |
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#endif |
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|
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# elif CORO_IRIX |
357 |
|
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coro_setjmp (ctx->env, 0); |
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ctx->env[JB_PC] = (__uint64_t)coro_init; |
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ctx->env[JB_SP] = (__uint64_t)STACK_ADJUST_PTR (sptr, ssize) - sizeof (long); |
361 |
|
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# elif CORO_ASM |
363 |
|
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ctx->sp = (void **)(ssize + (char *)sptr); |
365 |
*--ctx->sp = (void *)abort; /* needed for alignment only */ |
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*--ctx->sp = (void *)coro_init; |
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|
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#if CORO_WIN_TIB |
369 |
*--ctx->sp = 0; /* ExceptionList */ |
370 |
*--ctx->sp = (char *)sptr + ssize; /* StackBase */ |
371 |
*--ctx->sp = sptr; /* StackLimit */ |
372 |
#endif |
373 |
|
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ctx->sp -= NUM_SAVED; |
375 |
memset (ctx->sp, 0, sizeof (*ctx->sp) * NUM_SAVED); |
376 |
|
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# elif CORO_UCONTEXT |
378 |
|
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getcontext (&(ctx->uc)); |
380 |
|
381 |
ctx->uc.uc_link = 0; |
382 |
ctx->uc.uc_stack.ss_sp = sptr; |
383 |
ctx->uc.uc_stack.ss_size = (size_t)ssize; |
384 |
ctx->uc.uc_stack.ss_flags = 0; |
385 |
|
386 |
makecontext (&(ctx->uc), (void (*)())coro_init, 0); |
387 |
|
388 |
# endif |
389 |
|
390 |
coro_transfer (create_coro, new_coro); |
391 |
} |
392 |
|
393 |
/*****************************************************************************/ |
394 |
/* pthread backend */ |
395 |
/*****************************************************************************/ |
396 |
#elif CORO_PTHREAD |
397 |
|
398 |
/* this mutex will be locked by the running coroutine */ |
399 |
pthread_mutex_t coro_mutex = PTHREAD_MUTEX_INITIALIZER; |
400 |
|
401 |
struct coro_init_args |
402 |
{ |
403 |
coro_func func; |
404 |
void *arg; |
405 |
coro_context *self, *main; |
406 |
}; |
407 |
|
408 |
static pthread_t null_tid; |
409 |
|
410 |
/* I'd so love to cast pthread_mutex_unlock to void (*)(void *)... */ |
411 |
static void |
412 |
mutex_unlock_wrapper (void *arg) |
413 |
{ |
414 |
pthread_mutex_unlock ((pthread_mutex_t *)arg); |
415 |
} |
416 |
|
417 |
static void * |
418 |
coro_init (void *args_) |
419 |
{ |
420 |
struct coro_init_args *args = (struct coro_init_args *)args_; |
421 |
coro_func func = args->func; |
422 |
void *arg = args->arg; |
423 |
|
424 |
pthread_mutex_lock (&coro_mutex); |
425 |
|
426 |
/* we try to be good citizens and use deferred cancellation and cleanup handlers */ |
427 |
pthread_cleanup_push (mutex_unlock_wrapper, &coro_mutex); |
428 |
coro_transfer (args->self, args->main); |
429 |
func (arg); |
430 |
pthread_cleanup_pop (1); |
431 |
|
432 |
return 0; |
433 |
} |
434 |
|
435 |
void |
436 |
coro_transfer (coro_context *prev, coro_context *next) |
437 |
{ |
438 |
pthread_cond_signal (&next->cv); |
439 |
pthread_cond_wait (&prev->cv, &coro_mutex); |
440 |
#if __FreeBSD__ /* freebsd is of course broken and needs manual testcancel calls... yay... */ |
441 |
pthread_testcancel (); |
442 |
#endif |
443 |
} |
444 |
|
445 |
void |
446 |
coro_create (coro_context *ctx, coro_func coro, void *arg, void *sptr, long ssize) |
447 |
{ |
448 |
static coro_context nctx; |
449 |
static int once; |
450 |
|
451 |
if (!once) |
452 |
{ |
453 |
once = 1; |
454 |
|
455 |
pthread_mutex_lock (&coro_mutex); |
456 |
pthread_cond_init (&nctx.cv, 0); |
457 |
null_tid = pthread_self (); |
458 |
} |
459 |
|
460 |
pthread_cond_init (&ctx->cv, 0); |
461 |
|
462 |
if (coro) |
463 |
{ |
464 |
pthread_attr_t attr; |
465 |
struct coro_init_args args; |
466 |
|
467 |
args.func = coro; |
468 |
args.arg = arg; |
469 |
args.self = ctx; |
470 |
args.main = &nctx; |
471 |
|
472 |
pthread_attr_init (&attr); |
473 |
#if __UCLIBC__ |
474 |
/* exists, but is borked */ |
475 |
/*pthread_attr_setstacksize (&attr, (size_t)ssize);*/ |
476 |
#elif __CYGWIN__ |
477 |
/* POSIX, not here */ |
478 |
pthread_attr_setstacksize (&attr, (size_t)ssize); |
479 |
#else |
480 |
pthread_attr_setstack (&attr, sptr, (size_t)ssize); |
481 |
#endif |
482 |
pthread_attr_setscope (&attr, PTHREAD_SCOPE_PROCESS); |
483 |
pthread_create (&ctx->id, &attr, coro_init, &args); |
484 |
|
485 |
coro_transfer (args.main, args.self); |
486 |
} |
487 |
else |
488 |
ctx->id = null_tid; |
489 |
} |
490 |
|
491 |
void |
492 |
coro_destroy (coro_context *ctx) |
493 |
{ |
494 |
if (!pthread_equal (ctx->id, null_tid)) |
495 |
{ |
496 |
pthread_cancel (ctx->id); |
497 |
pthread_mutex_unlock (&coro_mutex); |
498 |
pthread_join (ctx->id, 0); |
499 |
pthread_mutex_lock (&coro_mutex); |
500 |
} |
501 |
|
502 |
pthread_cond_destroy (&ctx->cv); |
503 |
} |
504 |
|
505 |
/*****************************************************************************/ |
506 |
/* fiber backend */ |
507 |
/*****************************************************************************/ |
508 |
#elif CORO_FIBER |
509 |
|
510 |
#define WIN32_LEAN_AND_MEAN |
511 |
#include <windows.h> |
512 |
|
513 |
#include <stdio.h>//D |
514 |
VOID CALLBACK |
515 |
coro_init (PVOID arg) |
516 |
{ |
517 |
coro_context *ctx = (coro_context *)arg; |
518 |
|
519 |
ctx->coro (ctx->arg); |
520 |
} |
521 |
|
522 |
void |
523 |
coro_transfer (coro_context *prev, coro_context *next) |
524 |
{ |
525 |
if (!prev->fiber) |
526 |
{ |
527 |
prev->fiber = GetCurrentFiber (); |
528 |
|
529 |
if (prev->fiber == 0 || prev->fiber == (void *)0x1e00) |
530 |
prev->fiber = ConvertThreadToFiber (0); |
531 |
} |
532 |
|
533 |
SwitchToFiber (next->fiber); |
534 |
} |
535 |
|
536 |
void |
537 |
coro_create (coro_context *ctx, coro_func coro, void *arg, void *sptr, long ssize) |
538 |
{ |
539 |
ctx->fiber = 0; |
540 |
ctx->coro = coro; |
541 |
ctx->arg = arg; |
542 |
|
543 |
if (!coro) |
544 |
return; |
545 |
|
546 |
ctx->fiber = CreateFiber (ssize, coro_init, ctx); |
547 |
} |
548 |
|
549 |
void |
550 |
coro_destroy (coro_context *ctx) |
551 |
{ |
552 |
DeleteFiber (ctx->fiber); |
553 |
} |
554 |
|
555 |
#else |
556 |
# error unsupported backend |
557 |
#endif |
558 |
|