sanchayanmaity/xv6-cs450
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convert syscall dispatch to table

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rsc 2007-08-08 09:41:21 +00:00
parent c664dd5d23
commit 453c6a65a2
2 changed files with 31 additions and 64 deletions
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3
defs.h
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@ -139,3 +139,6 @@ struct inode* mknod1(struct inode*, char*, short, short, short);
int unlink(char*);
void iupdate(struct inode*);
int link(char*, char*);
// number of elements in fixed-size array
#define NELEM(x) (sizeof(x)/sizeof((x)[0]))

92
syscall.c
View file

@ -108,75 +108,39 @@ extern int sys_unlink(void);
extern int sys_wait(void);
extern int sys_write(void);
static int (*syscalls[])(void) = {
[SYS_chdir] sys_chdir,
[SYS_close] sys_close,
[SYS_dup] sys_dup,
[SYS_exec] sys_exec,
[SYS_exit] sys_exit,
[SYS_fork] sys_fork,
[SYS_fstat] sys_fstat,
[SYS_getpid] sys_getpid,
[SYS_kill] sys_kill,
[SYS_link] sys_link,
[SYS_mkdir] sys_mkdir,
[SYS_mknod] sys_mknod,
[SYS_open] sys_open,
[SYS_pipe] sys_pipe,
[SYS_read] sys_read,
[SYS_sbrk] sys_sbrk,
[SYS_unlink] sys_unlink,
[SYS_wait] sys_wait,
[SYS_write] sys_write,
};
void
syscall(void)
{
struct proc *cp = curproc[cpu()];
int num = cp->tf->eax;
int ret = -1;
switch(num){
case SYS_fork:
ret = sys_fork();
break;
case SYS_exit:
ret = sys_exit();
break;
case SYS_wait:
ret = sys_wait();
break;
case SYS_pipe:
ret = sys_pipe();
break;
case SYS_write:
ret = sys_write();
break;
case SYS_read:
ret = sys_read();
break;
case SYS_close:
ret = sys_close();
break;
case SYS_kill:
ret = sys_kill();
break;
case SYS_exec:
ret = sys_exec();
break;
case SYS_open:
ret = sys_open();
break;
case SYS_mknod:
ret = sys_mknod();
break;
case SYS_unlink:
ret = sys_unlink();
break;
case SYS_fstat:
ret = sys_fstat();
break;
case SYS_link:
ret = sys_link();
break;
case SYS_mkdir:
ret = sys_mkdir();
break;
case SYS_chdir:
ret = sys_chdir();
break;
case SYS_dup:
ret = sys_dup();
break;
case SYS_getpid:
ret = sys_getpid();
break;
case SYS_sbrk:
ret = sys_sbrk();
break;
default:
cprintf("unknown sys call %d\n", num);
// Maybe kill the process?
break;
if(num >= 0 && num < NELEM(syscalls) && syscalls[num])
cp->tf->eax = syscalls[num]();
else {
cprintf("%d %s: unknown sys call %d\n",
cp->pid, cp->name, num);
cp->tf->eax = -1;
}
cp->tf->eax = ret;
}