100 lines
1.3 KiB
ArmAsm
100 lines
1.3 KiB
ArmAsm
/* $Id$ */
|
|
/* Copyright (c) 2018 Pierre Pronchery <khorben@defora.org> */
|
|
/* This file is part of DeforaOS uKernel */
|
|
|
|
|
|
.section .text
|
|
_syscall:
|
|
mov %rcx, %r10
|
|
syscall
|
|
jnc _syscall_return
|
|
.errno:
|
|
#ifdef __PIC__
|
|
mov errno@GOTPCREL(%rip), %rcx
|
|
mov %rax, (%rcx)
|
|
#else
|
|
mov %rax, errno
|
|
#endif
|
|
mov $-1, %rax
|
|
_syscall_return:
|
|
ret
|
|
|
|
|
|
/* exit */
|
|
.global _exit
|
|
.type _exit, @function
|
|
_exit:
|
|
mov $0x1, %rax
|
|
jmp _syscall
|
|
|
|
|
|
/* read */
|
|
.global _read
|
|
.type _read, @function
|
|
_read:
|
|
mov $0x3, %rax
|
|
jmp _syscall
|
|
|
|
|
|
/* start */
|
|
.global _start
|
|
.type _start, @function
|
|
_start:
|
|
/* reset the stack */
|
|
xor %rbp, %rbp
|
|
|
|
/* setup the environment */
|
|
mov (%rsp), %rdi /* argc */
|
|
mov %rsp, %rsi /* argv */
|
|
add $0x8, %rsi
|
|
mov %rdi, %rdx /* envp */
|
|
shl $3, %rdx
|
|
add %rsi, %rdx
|
|
add $0x8, %rdx
|
|
#ifdef __PIC__ /* environ */
|
|
mov environ@GOTPCREL(%rip), %rcx
|
|
mov %rdx, (%rcx)
|
|
#else
|
|
mov %rdx, environ
|
|
#endif
|
|
push %rdi
|
|
push %rsi
|
|
push %rdx
|
|
|
|
#if defined(__SSP__)
|
|
/* initialize SSP */
|
|
# ifdef __PIC__
|
|
call __stack_chk_setup@PLT
|
|
# else
|
|
call __stack_chk_setup
|
|
# endif
|
|
#endif
|
|
|
|
/* run the userland kernel */
|
|
pop %rdx
|
|
pop %rsi
|
|
pop %rdi
|
|
#ifdef __PIC__
|
|
call main@PLT
|
|
#else
|
|
call main
|
|
#endif
|
|
|
|
/* exit the userland kernel */
|
|
mov %rax, %rdi
|
|
#ifdef __PIC__
|
|
call exit@PLT
|
|
#else
|
|
call exit
|
|
#endif
|
|
|
|
hlt
|
|
|
|
|
|
/* write */
|
|
.global _write
|
|
.type _write, @function
|
|
_write:
|
|
mov $0x4, %rax
|
|
jmp _syscall
|