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Parse the command-line arguments

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This commit is contained in:
Pierre Pronchery 2019-04-16 00:02:03 +02:00
parent 90a004791b
commit d00b0840d5
1 changed files with 49 additions and 8 deletions
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57
src/arch/i386/kernel.S
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@ -88,21 +88,61 @@ _start:
call multiboot
add $0x4, %esp
cmp $0x0, %eax
jne 2f
jne 1f
/* parse the command line */
push %ebp
mov %esp, %ebp
push $0x0 /* argc */
mov %ebx, %ecx /* ecx = mi->cmdline; */
add $0x10, %ecx
mov (%ecx), %ecx /* ecx = *ecx; */
mov %ecx, %edx /* edx = ecx; */
3:
mov (%edx), %al /* al = *edx; */
cmp $0x0, %al /* if(al == '\0') */
je 4f /* goto 4f; */
inc %edx /* edx++; */
jmp 3b /* goto 3b; */
4:
push $0x0 /* argv[] = NULL; */
5:
cmp %ecx, %edx /* if(ecx == edx) */
je 7f /* goto 7f; */
mov (%edx), %al /* al = *edx; */
cmp $0x20, %al /* if(al != ' ') */
jne 6f /* goto 6f; */
movb $0x0, (%edx) /* *edx = '\0'; */
inc %edx
push %edx /* argv[] = edx; */
DEBUG_STRING(%edx)
dec %edx
incl -0x4(%ebp) /* argc++; */
6:
dec %edx /* edx--; */
jmp 5b /* goto 4b; */
7:
push %edx /* argv[] = edx; */
DEBUG_STRING(%edx)
incl -0x4(%ebp) /* argc++; */
/* prepare the arguments */
push $0x0
push $0x0
mov %ebx, %eax
add $0x10, %eax
push %eax
push $0x1
mov %esp, %eax /* eax = &argv; */
push %esp
push %ebx /* auxv */
push $0x0 /* envp */
push %eax /* argv */
push -0x4(%ebp) /* argc */
jmp 2f
1:
/* FIXME setup paging */
/* prepare the arguments */
push %ebp
mov %esp, %ebp
push $0x0
push $0x0
push $0x0
@ -111,7 +151,8 @@ _start:
2:
/* start the kernel */
call main
add $0x10, %esp
mov %ebp, %esp
pop %ebp
/* exit the kernel */
push %eax