setjmp.c

来自「一个类linux的dos下开发的操作系统.」· C语言 代码 · 共 23 行

#include <setjmp.h> /* jmp_buf */
/*****************************************************************************
*****************************************************************************/
__inline__ int setjmp(jmp_buf buf)
{
	__asm__ __volatile__("movl %%edi,(%0)\n"
		"movl %%esi,4(%0)\n"
		"movl %%ebp,8(%0)\n"

		"movl %%ebx,16(%0)\n"
		"movl %%edx,20(%0)\n"
		"movl %%ecx,24(%0)\n"
/* ESP value after we RET from this function */
		"leal 8(%%ebp),%%eax\n"
		"movl %%eax,32(%0)\n"
/* EIP value after we RET from this function */
		"movl 4(%%ebp),%%eax\n"
		"movl %%eax,36(%0)\n"
		:
		: "b"(buf));
	return 0;
}