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/* ==== machdep.c ============================================================
* Copyright (c) 1993 Chris Provenzano, proven@athena.mit.edu
*
* Description : Machine dependent functions for decstation with r2000/r3000
*
* 1.00 93/07/21 proven
* -Started coding this file.
*/
#ifndef lint
static const char rcsid[] = "$Id$";
#endif
#include <pthread.h>
#include <stdlib.h>
#include <errno.h>
/*
* The r2000/r3000 processors do not have a test and set instruction, so
* the semaphore TEST_AND_SET macro is linked very closely to the interrupt
* handelling of the pthreads package.
*/
/* ==========================================================================
* semaphore_test_and_set()
*
* SEMAPHORE_TEST_AND_SET prevents interrupts, tests the lock and then
* turns interrupts back on, checking to see if any interrupts have occured
* between the prevent and resume.
*/
int semaphore_test_and_set(semaphore *lock)
{
int rval;
/* None of this should be necessary
sig_prevent();
if (!(rval = (*lock))) {
*lock = SEMAPHORE_SET;
}
sig_check_and_resume();
return(rval);
*/
}
/* ==========================================================================
* machdep_save_state()
*/
int machdep_save_state(void)
{
return(setjmp(pthread_run->machdep_data.machdep_state));
}
/* ==========================================================================
* machdep_save_float_state()
*/
void machdep_save_float_state(struct pthread * pthread)
{
return;
}
/* ==========================================================================
* fake_longjmp()
*/
void fake_longjmp(jmp_buf env)
{
asm("li $5,1; sw $5, 20($4); li $2,103; syscall");
}
/* ==========================================================================
* machdep_restore_state()
*
* When I redo machdep_save_state, I'll put the asm in machdep_save_state()
* and machdep_restore_state() and I won't have to do an additional function
* call.
*/
void machdep_restore_state(void)
{
fake_longjmp(pthread_run->machdep_data.machdep_state);
/* longjmp(pthread_run->machdep_data.machdep_state, 1); */
}
/* ==========================================================================
* machdep_restore_float_state()
*/
void machdep_restore_float_state(void)
{
return;
}
/* ==========================================================================
* machdep_set_thread_timer()
*/
void machdep_set_thread_timer(struct machdep_pthread *machdep_pthread)
{
if (setitimer(ITIMER_VIRTUAL, &(machdep_pthread->machdep_timer), NULL)) {
PANIC();
}
}
/* ==========================================================================
* machdep_unset_thread_timer()
*/
void machdep_unset_thread_timer(struct machdep_pthread *machdep_pthread)
{
struct itimerval zeroval = { { 0, 0 }, { 0, 0} };
if (setitimer(ITIMER_VIRTUAL, &zeroval, NULL)) {
PANIC();
}
}
/* ==========================================================================
* machdep_pthread_cleanup()
*/
void *machdep_pthread_cleanup(struct machdep_pthread *machdep_pthread)
{
return(machdep_pthread->machdep_stack);
}
/* ==========================================================================
* machdep_pthread_start()
*/
void machdep_pthread_start(void)
{
context_switch_done();
pthread_sched_resume();
/* Run current threads start routine with argument */
pthread_exit(pthread_run->machdep_data.start_routine
(pthread_run->machdep_data.start_argument));
/* should never reach here */
PANIC();
}
/* ==========================================================================
* __machdep_stack_free()
*/
void __machdep_stack_free(void * stack)
{
free(stack);
}
/* ==========================================================================
* __machdep_stack_alloc()
*/
void * __machdep_stack_alloc(size_t size)
{
void * stack;
return(malloc(size));
}
/* ==========================================================================
* __machdep_pthread_create()
*/
void __machdep_pthread_create(struct machdep_pthread *machdep_pthread,
void *(* start_routine)(), void *start_argument,
long stack_size, long nsec, long flags)
{
machdep_pthread->start_routine = start_routine;
machdep_pthread->start_argument = start_argument;
machdep_pthread->machdep_timer.it_value.tv_sec = 0;
machdep_pthread->machdep_timer.it_interval.tv_sec = 0;
machdep_pthread->machdep_timer.it_interval.tv_usec = 0;
machdep_pthread->machdep_timer.it_value.tv_usec = nsec / 1000;
setjmp(machdep_pthread->machdep_state);
/*
* Set up new stact frame so that it looks like it
* returned from a longjmp() to the beginning of
* machdep_pthread_start().
*/
machdep_pthread->machdep_state[JB_RA] = (int)machdep_pthread_start;
machdep_pthread->machdep_state[JB_PC] = (int)machdep_pthread_start;
/* Stack starts high and builds down. */
machdep_pthread->machdep_state[JB_SP] =
(int)machdep_pthread->machdep_stack + stack_size;
/* This is the real global pointer */
/* machdep_pthread->machdep_state[JB_GP] = 0; */
}
/* ==========================================================================
* machdep_sys_sigprocmask()
* This isn't a real implementation; we can make the assumption that the
* pthreads library is not using oset, and that it is always blocking or
* unblocking all signals at once.
*/
int machdep_sys_sigprocmask(int how, const sigset_t *set, sigset_t *oset)
{
switch(how) {
case SIG_BLOCK:
sigblock(*set);
break;
case SIG_UNBLOCK:
sigsetmask(~*set);
break;
case SIG_SETMASK:
sigsetmask(*set);
break;
default:
return -EINVAL;
}
return(OK);
}
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