/* * Copyright (c) 2001-2008 Marc Alexander Lehmann * * Redistribution and use in source and binary forms, with or without modifica- * tion, are permitted provided that the following conditions are met: * * 1. Redistributions of source code must retain the above copyright notice, * this list of conditions and the following disclaimer. * * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER- * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE- * CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH- * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED * OF THE POSSIBILITY OF SUCH DAMAGE. * * Alternatively, the contents of this file may be used under the terms of * the GNU General Public License ("GPL") version 2 or any later version, * in which case the provisions of the GPL are applicable instead of * the above. If you wish to allow the use of your version of this file * only under the terms of the GPL and not to allow others to use your * version of this file under the BSD license, indicate your decision * by deleting the provisions above and replace them with the notice * and other provisions required by the GPL. If you do not delete the * provisions above, a recipient may use your version of this file under * either the BSD or the GPL. * * This library is modelled strictly after Ralf S. Engelschalls article at * http://www.gnu.org/software/pth/rse-pmt.ps. So most of the credit must * go to Ralf S. Engelschall . */ #include "coro.h" #if !defined(STACK_ADJUST_PTR) /* IRIX is decidedly NON-unix */ # if __sgi # define STACK_ADJUST_PTR(sp,ss) ((char *)(sp) + (ss) - 8) # define STACK_ADJUST_SIZE(sp,ss) ((ss) - 8) # elif __i386__ && CORO_LINUX # define STACK_ADJUST_PTR(sp,ss) ((char *)(sp) + (ss)) # define STACK_ADJUST_SIZE(sp,ss) (ss) # elif __amd64__ && CORO_LINUX # define STACK_ADJUST_PTR(sp,ss) ((char *)(sp) + (ss) - 8) # define STACK_ADJUST_SIZE(sp,ss) (ss) # else # define STACK_ADJUST_PTR(sp,ss) (sp) # define STACK_ADJUST_SIZE(sp,ss) (ss) # endif #endif #if CORO_UCONTEXT # include #endif #if CORO_SJLJ || CORO_LOSER || CORO_LINUX || CORO_IRIX || CORO_ASM #include #if CORO_SJLJ # include # include # include #endif static volatile coro_func coro_init_func; static volatile void *coro_init_arg; static volatile coro_context *new_coro, *create_coro; /* what we really want to detect here is wether we use a new-enough version of GAS */ /* instead, check for gcc 3, ELF and GNU/Linux and hope for the best */ #if __GNUC__ >= 3 && __ELF__ && __linux__ # define HAVE_CFI 1 #endif static void coro_init (void) { volatile coro_func func = coro_init_func; volatile void *arg = coro_init_arg; coro_transfer ((coro_context *)new_coro, (coro_context *)create_coro); func ((void *)arg); /* the new coro returned. bad. just abort() for now */ abort (); } # if CORO_SJLJ static volatile int trampoline_count; /* trampoline signal handler */ static void trampoline (int sig) { if (setjmp (((coro_context *)new_coro)->env)) { #if HAVE_CFI asm (".cfi_startproc"); #endif coro_init (); /* start it */ #if HAVE_CFI asm (".cfi_endproc"); #endif } else trampoline_count++; } # endif #endif #if CORO_ASM void __attribute__((__noinline__, __fastcall__)) coro_transfer (struct coro_context *prev, struct coro_context *next) { asm volatile ( #if __amd64 # define NUM_CLOBBERED 5 "push %%rbx\n\t" "push %%r12\n\t" "push %%r13\n\t" "push %%r14\n\t" "push %%r15\n\t" "mov %%rsp, %0\n\t" "mov %1, %%rsp\n\t" "pop %%r15\n\t" "pop %%r14\n\t" "pop %%r13\n\t" "pop %%r12\n\t" "pop %%rbx\n\t" #elif __i386 # define NUM_CLOBBERED 4 "push %%ebx\n\t" "push %%esi\n\t" "push %%edi\n\t" "push %%ebp\n\t" "mov %%esp, %0\n\t" "mov %1, %%esp\n\t" "pop %%ebp\n\t" "pop %%edi\n\t" "pop %%esi\n\t" "pop %%ebx\n\t" #else # error unsupported architecture #endif : "=m" (prev->sp) : "m" (next->sp) ); } #endif /* initialize a machine state */ void coro_create (coro_context *ctx, coro_func coro, void *arg, void *sptr, long ssize) { #if CORO_UCONTEXT getcontext (&(ctx->uc)); ctx->uc.uc_link = 0; ctx->uc.uc_stack.ss_sp = STACK_ADJUST_PTR (sptr,ssize); ctx->uc.uc_stack.ss_size = (size_t) STACK_ADJUST_SIZE (sptr,ssize); ctx->uc.uc_stack.ss_flags = 0; makecontext (&(ctx->uc), (void (*)()) coro, 1, arg); #elif CORO_SJLJ || CORO_LOSER || CORO_LINUX || CORO_IRIX || CORO_ASM # if CORO_SJLJ stack_t ostk, nstk; struct sigaction osa, nsa; sigset_t nsig, osig; # endif coro_context nctx; coro_init_func = coro; coro_init_arg = arg; new_coro = ctx; create_coro = &nctx; # if CORO_SJLJ /* we use SIGUSR2. first block it, then fiddle with it. */ sigemptyset (&nsig); sigaddset (&nsig, SIGUSR2); sigprocmask (SIG_BLOCK, &nsig, &osig); nsa.sa_handler = trampoline; sigemptyset (&nsa.sa_mask); nsa.sa_flags = SA_ONSTACK; if (sigaction (SIGUSR2, &nsa, &osa)) { perror ("sigaction"); abort (); } /* set the new stack */ nstk.ss_sp = STACK_ADJUST_PTR (sptr,ssize); /* yes, some platforms (IRIX) get this wrong. */ nstk.ss_size = STACK_ADJUST_SIZE (sptr,ssize); nstk.ss_flags = 0; if (sigaltstack (&nstk, &ostk) < 0) { perror ("sigaltstack"); abort (); } trampoline_count = 0; kill (getpid (), SIGUSR2); sigfillset (&nsig); sigdelset (&nsig, SIGUSR2); while (!trampoline_count) sigsuspend (&nsig); sigaltstack (0, &nstk); nstk.ss_flags = SS_DISABLE; if (sigaltstack (&nstk, 0) < 0) perror ("sigaltstack"); sigaltstack (0, &nstk); if (~nstk.ss_flags & SS_DISABLE) abort (); if (~ostk.ss_flags & SS_DISABLE) sigaltstack (&ostk, 0); sigaction (SIGUSR2, &osa, 0); sigprocmask (SIG_SETMASK, &osig, 0); # elif CORO_LOSER setjmp (ctx->env); #if __CYGWIN__ ctx->env[7] = (long)((char *)sptr + ssize); ctx->env[8] = (long)coro_init; #elif defined(_M_IX86) ((_JUMP_BUFFER *)&ctx->env)->Eip = (long)coro_init; ((_JUMP_BUFFER *)&ctx->env)->Esp = (long)STACK_ADJUST_PTR (sptr,ssize); #elif defined(_M_AMD64) ((_JUMP_BUFFER *)&ctx->env)->Rip = (__int64)coro_init; ((_JUMP_BUFFER *)&ctx->env)->Rsp = (__int64)STACK_ADJUST_PTR (sptr,ssize); #elif defined(_M_IA64) ((_JUMP_BUFFER *)&ctx->env)->StIIP = (__int64)coro_init; ((_JUMP_BUFFER *)&ctx->env)->IntSp = (__int64)STACK_ADJUST_PTR (sptr,ssize); #else #error "microsoft libc or architecture not supported" #endif # elif CORO_LINUX _setjmp (ctx->env); #if __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 0 && defined (JB_PC) && defined (JB_SP) ctx->env[0].__jmpbuf[JB_PC] = (long)coro_init; ctx->env[0].__jmpbuf[JB_SP] = (long)STACK_ADJUST_PTR (sptr, ssize); #elif __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 0 && defined (__mc68000__) ctx->env[0].__jmpbuf[0].__aregs[0] = (long int)coro_init; ctx->env[0].__jmpbuf[0].__sp = (int *)((char *)sptr + ssize); #elif defined (__GNU_LIBRARY__) && defined (__i386__) ctx->env[0].__jmpbuf[0].__pc = (char *)coro_init; ctx->env[0].__jmpbuf[0].__sp = (void *)((char *)sptr + ssize); #elif defined (__GNU_LIBRARY__) && defined (__amd64__) ctx->env[0].__jmpbuf[JB_PC] = (long)coro_init; ctx->env[0].__jmpbuf[JB_RSP] = (long)STACK_ADJUST_PTR (sptr, ssize); #else # error "linux libc or architecture not supported" #endif # elif CORO_IRIX setjmp (ctx->env); ctx->env[JB_PC] = (__uint64_t)coro_init; ctx->env[JB_SP] = (__uint64_t)STACK_ADJUST_PTR (sptr, ssize); # elif CORO_ASM ctx->sp = (volatile void **)(ssize + (char *)sptr); *--ctx->sp = (void *)coro_init; *--ctx->sp = (void *)coro_init; // this is needed when the prologue saves ebp ctx->sp -= NUM_CLOBBERED; # endif coro_transfer ((coro_context *)create_coro, (coro_context *)new_coro); #else # error unsupported architecture #endif }