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🆕 do_execve函数，跳转至应用层

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fslongjin
2022-02-13 22:41:35 +08:00
parent 781a105d2f
commit 0757e7a3cd
8 changed files with 178 additions and 93 deletions
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32
kernel/exception/entry.S
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@ -99,6 +99,38 @@ Err_Code:
jmp ret_from_exception
// 从系统调用中返回
ENTRY(ret_from_system_call)
movq %rax, 0x80(%rsp) // 将当前rax的值先存到栈中rax的位置
popq %r15
popq %r14
popq %r13
popq %r12
popq %r11
popq %r10
popq %r9
popq %r8
popq %rbx
popq %rcx
popq %rdx
popq %rsi
popq %rdi
popq %rbp
popq %rax // 不允许直接pop到ds
movq %rax, %ds
popq %rax
movq %rax, %es
popq %rax
addq $0x38, %rsp
.byte 0x48
sysexit
// 0 #DE 除法错误
ENTRY(divide_error)