83 lines
2.2 KiB
C
83 lines
2.2 KiB
C
/*
|
|
* File : stack.c
|
|
* This file is part of RT-Thread RTOS
|
|
* COPYRIGHT (C) 2008 - 2012, RT-Thread Development Team
|
|
*
|
|
* This program 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 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program 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, write to the Free Software Foundation, Inc.,
|
|
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
|
|
*
|
|
* Change Logs:
|
|
* Date Author Notes
|
|
* 2016年9月8日 Urey the first version
|
|
*/
|
|
|
|
#include <rtthread.h>
|
|
|
|
#include "../common/mips.h"
|
|
|
|
register U32 $GP __asm__ ("$28");
|
|
|
|
rt_uint8_t *rt_hw_stack_init(void *tentry, void *parameter, rt_uint8_t *stack_addr, void *texit)
|
|
{
|
|
static rt_uint32_t wSR=0;
|
|
static rt_uint32_t wGP;
|
|
|
|
mips_reg_ctx *regCtx;
|
|
mips_arg_ctx *argCtx;
|
|
rt_uint32_t i;
|
|
|
|
if (wSR == 0)
|
|
{
|
|
wSR = read_c0_status();
|
|
wSR &= 0xfffffffe;
|
|
wSR |= 0x0403;
|
|
|
|
wGP = $GP;
|
|
}
|
|
|
|
if ((rt_uint32_t) stack_addr & 0x7)
|
|
{
|
|
stack_addr = (rt_uint8_t *)((rt_uint32_t)stack_addr - 4);
|
|
}
|
|
|
|
argCtx = (mips_arg_ctx *)((rt_uint32_t)stack_addr - sizeof(mips_arg_ctx));
|
|
regCtx = (mips_reg_ctx *)((rt_uint32_t)stack_addr - sizeof(mips_arg_ctx) - sizeof(mips_reg_ctx));
|
|
|
|
for (i = 0; i < 4; ++i)
|
|
{
|
|
argCtx->args[i] = i;
|
|
}
|
|
|
|
//保存通用寄存器
|
|
for (i = 0; i < 32; ++i)
|
|
{
|
|
regCtx->regs[i] = i;
|
|
}
|
|
|
|
regCtx->regs[REG_SP] = (rt_uint32_t)stack_addr;
|
|
regCtx->regs[REG_A0] = (rt_uint32_t)parameter;
|
|
regCtx->regs[REG_GP] = (rt_uint32_t)wGP;
|
|
regCtx->regs[REG_FP] = (rt_uint32_t)0x0;
|
|
regCtx->regs[REG_RA] = (rt_uint32_t)texit;
|
|
|
|
regCtx->CP0DataLO = 0x00;
|
|
regCtx->CP0DataHI = 0x00;
|
|
regCtx->CP0Cause = read_c0_cause();
|
|
regCtx->CP0Status = wSR;
|
|
regCtx->CP0EPC = (rt_uint32_t)tentry;
|
|
regCtx->CP0BadVAddr= 0x00;
|
|
|
|
return (rt_uint8_t *)(regCtx);
|
|
}
|