54 lines
974 B
ArmAsm
54 lines
974 B
ArmAsm
.code16
|
|
|
|
#ifndef REGPARM
|
|
# error "This file assumes -mregparm=3 -DREGPARM=3"
|
|
#endif
|
|
|
|
.section ".init","ax"
|
|
.globl _start
|
|
.type _start,@function
|
|
_start:
|
|
# Align the stack and make sure the high half is zero
|
|
andl $0xfff8,%esp
|
|
|
|
# Clear the .bss
|
|
cld
|
|
xorl %eax,%eax
|
|
movw $__bss_start,%di
|
|
movw $_end+3,%cx
|
|
subw %di,%cx
|
|
shrw $2,%cx
|
|
rep ; stosl
|
|
|
|
# Compute argc and argv (assumes REGPARM)
|
|
xorl %edx,%edx
|
|
movzbw 0x80,%bx
|
|
movb %dl,0x81(%bx) # Zero-terminate string
|
|
movb $0x81,%dl
|
|
pushl %eax # Make space for argv
|
|
movl %esp,%eax
|
|
calll __parse_argv
|
|
pushl %eax # argc
|
|
|
|
# Initialize malloc
|
|
calll __init_memory_arena
|
|
|
|
# Now call main... (NOTE: gcc forces main to be regparm 0)
|
|
popl %eax # argc
|
|
popl %edx # argv
|
|
calll main
|
|
|
|
# Here %eax is the exit code, fall through into exit
|
|
|
|
.size _start,.-_start
|
|
|
|
.globl exit
|
|
.type exit,@function
|
|
exit:
|
|
# Exit code already in %eax
|
|
movb $0x4c,%ah # Terminate program
|
|
int $0x21
|
|
1: hlt
|
|
jmp 1b
|
|
.size exit,.-exit
|