51 lines
755 B
C
51 lines
755 B
C
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#include "types.h"
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#include "param.h"
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#include "mmu.h"
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#include "proc.h"
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#include "defs.h"
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#include "x86.h"
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#include "traps.h"
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#include "syscall.h"
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/*
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* User code makes a system call with INT T_SYSCALL.
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* System call number in %eax.
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* Arguments on the stack.
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*
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* Return value? Error indication? Errno?
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*/
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void
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sys_fork()
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{
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newproc();
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}
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void
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sys_exit()
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{
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curproc->state = UNUSED;
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// XXX free resources. notify parent. abandon children.
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swtch();
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}
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void
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syscall()
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{
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int num = curproc->tf->tf_regs.reg_eax;
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cprintf("%x sys %d\n", curproc, num);
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switch(num){
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case SYS_fork:
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sys_fork();
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break;
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case SYS_exit:
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sys_exit();
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break;
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default:
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cprintf("unknown sys call %d\n", num);
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// XXX fault
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break;
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}
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}
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