ChibiOS/os/ports/GCC/SIMIA32/chcore.c

86 lines
2.8 KiB
C

/*
ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010,
2011 Giovanni Di Sirio.
This file is part of ChibiOS/RT.
ChibiOS/RT is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
ChibiOS/RT is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* @addtogroup SIMIA32_CORE
* @{
*/
#include <stdlib.h>
#include "ch.h"
#include "hal.h"
/**
* Performs a context switch between two threads.
* @param otp the thread to be switched out
* @param ntp the thread to be switched in
*/
__attribute__((used))
static void __dummy(Thread *ntp, Thread *otp) {
(void)ntp; (void)otp;
#if defined(WIN32)
asm volatile (".globl @port_switch@8 \n\t" \
"@port_switch@8:");
#elif defined(__APPLE__)
asm volatile (".globl _port_switch \n\t" \
"_port_switch:");
#else
asm volatile (".globl port_switch \n\t" \
"port_switch:");
#endif
asm volatile ("push %ebp \n\t" \
"push %esi \n\t" \
"push %edi \n\t" \
"push %ebx \n\t" \
"movl %esp, 12(%edx) \n\t" \
"movl 12(%ecx), %esp \n\t" \
"pop %ebx \n\t" \
"pop %edi \n\t" \
"pop %esi \n\t" \
"pop %ebp \n\t" \
"ret");
}
/**
* Halts the system. In this implementation it just exits the simulation.
*/
__attribute__((fastcall))
void port_halt(void) {
exit(2);
}
/**
* Threads return point, it just invokes @p chThdExit().
*/
void threadexit(void) {
#if defined(WIN32) || defined (__APPLE__)
asm volatile ("push %eax \n\t" \
"call _chThdExit");
#else
asm volatile ("push %eax \n\t" \
"call chThdExit");
#endif
}
/** @} */