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/*
* 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��9��8�� 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;
}
//����ͨ�üĴ���
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);
}
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