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typedef struct
{
e_uint32_t r0;
e_uint32_t r1;
e_uint32_t r2;
e_uint32_t r3;
e_uint32_t r12;
e_uint32_t lr;
e_uint32_t pc;
e_uint32_t xpsr;
}e_cpu_reg;
typedef struct
{
e_uint32_t r4;
e_uint32_t r5;
e_uint32_t r6;
e_uint32_t r7;
e_uint32_t r8;
e_uint32_t r9;
e_uint32_t r10;
e_uint32_t r11;
e_cpu_reg cpu_reg_autosave;
}e_cpu_reg_to_save;
void *e_thread_sp_init(e_thread *thread)
{
e_uint32_t *stk; //////指針類型定義錯(cuò)誤，造成極其嚴(yán)重的后果。（應(yīng)改為e_uint8_t）
e_cpu_reg_to_save *cpu_save_reg;
stk = thread -> stack_addr;///獲取任務(wù)的堆棧
stk = stk + thread->size;/////取得任務(wù)的堆棧最大值，因?yàn)槭窍蛳律L(zhǎng)的
stk = (stk - (((e_uint32_t)stk) % 8)); /////模8處理，地址不
stk = stk - (sizeof(e_cpu_reg_to_save));////從底部騰出CPU需要保存的寄存器占用的地址
cpu_save_reg = (e_cpu_reg_to_save *)stk;
cpu_save_reg ->cpu_reg_autosave.r0= 0x0;
cpu_save_reg ->cpu_reg_autosave.r1 = 0x1;
cpu_save_reg ->cpu_reg_autosave.r2 = 0x2;
cpu_save_reg ->cpu_reg_autosave.r3 = 0x3;
cpu_save_reg ->cpu_reg_autosave.r12 = 0x12;
cpu_save_reg ->cpu_reg_autosave.lr = 0xdeadbeef;
cpu_save_reg ->cpu_reg_autosave.pc = (e_uint32_t)(thread -> program);
cpu_save_reg ->cpu_reg_autosave.xpsr = 0x01000000;
cpu_save_reg ->r4 = 0x04;
cpu_save_reg ->r5 = 0x05;
cpu_save_reg ->r6 = 0x06;
cpu_save_reg ->r7 = 0x07;
cpu_save_reg ->r8 = 0x08;
cpu_save_reg ->r9 = 0x09;
cpu_save_reg ->r10 = 0x0a;
cpu_save_reg ->r11 = 0x0b;
return stk;
}
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