exec.c

用于汇编领域的,运用于OS的MAIN函数.基于硬件基础的源代码

#include "hos.h"
unsigned long EXEC_load_body(char *buf){
  // load code in buf to 0x30000000
  //memcpy(0x30000000, buf, strlen(buf));
  printk("in EXEC load body\n");
  mymemcpy(0x0300000, buf, 14); // for now
  return 0x300000;
}

int do_execve(struct pt_regs *regs){
// regs->ecx points to the file path for exec
    char *path; int x; char buf[512]; unsigned long * xx;
	unsigned long start_loc;
	path=regs->ecx;
	printk("path is %s\n",path);
    x=do_open(path);
	do_read(x, buf, 512);
	printk("the buf read from disk is: ");
	for(x=0;x<14;x++) printk("%x ", buf[x]); 
	start_loc = EXEC_load_body(buf);
	printk("the code at 0x300000 is: ");
	xx=(unsigned long *)0x300000;
	for(x=0;x<4;x++) printk("%x ", xx[x]); 
	// change starting ip
	regs->eip = start_loc;
}

int sys_execve(struct pt_regs regs){
   return do_execve(&regs);
}