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/*
* Copyright (c) 2001 Marc Alexander Lehmann <pcg@goof.com>
*
* 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.
*
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* 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.
*
* 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 <rse@engelschall.com>.
*/
#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)
# else
# define STACK_ADJUST_PTR(sp,ss) (sp)
# define STACK_ADJUST_SIZE(sp,ss) (ss)
# endif
#endif
#if CORO_SJLJ || CORO_LOOSE || CORO_LINUX || CORO_IRIX
#include <signal.h>
static volatile coro_func coro_init_func;
static volatile void *coro_init_arg;
static volatile coro_context *new_coro, *create_coro;
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))
coro_init (); /* start it */
else
trampoline_count++;
}
# endif
#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_LOOSE || CORO_LINUX || CORO_IRIX
# 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");
/* 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");
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 (SIGUSR1, &osa, 0);
sigprocmask (SIG_SETMASK, &osig, 0);
# elif CORO_LOOSE
setjmp (ctx->env);
ctx->env[7] = (long)((char *)sptr + ssize);
ctx->env[8] = (long)coro_init;
# elif CORO_LINUX
setjmp (ctx->env);
#if defined(__GLIBC__) && defined(__GLIBC_MINOR__) \
&& __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 defined(__GLIBC__) && defined(__GLIBC_MINOR__) \
&& __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);
#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);
# endif
coro_transfer ((coro_context *)create_coro, (coro_context *)new_coro);
#else
error unsupported architecture
#endif
}
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