| .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 |
