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hex0.S: open target file for writing.

This commit is contained in:
Andrius Štikonas 2022-07-14 22:55:42 +01:00
parent 8a344b7275
commit 34060fc7e5
1 changed files with 26 additions and 7 deletions
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33
amd64/Development/hex0.S
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@ -34,6 +34,7 @@ _start:
# Command line args # Command line args
mov rax, [rsp+64] # get image mov rax, [rsp+64] # get image
add rsp, 72 # deallocate stack
mov rcx, rax # save image mov rcx, rax # save image
mov rax, [rax+56] # options = image->load_options mov rax, [rax+56] # options = image->load_options
@ -52,7 +53,7 @@ loop_options2: # Skip argv[1]
cmp bl, 0x20 # if *options != ' ' cmp bl, 0x20 # if *options != ' '
jne loop_options2 # then jump jne loop_options2 # then jump
mov qword ptr [rax], # *options = 0; mov byte ptr [rax], 0 # *options = 0;
add rax, 2 # ++options add rax, 2 # ++options
push rax # out = options push rax # out = options
@ -64,17 +65,35 @@ loop_options2: # Skip argv[1]
mov rdx, [SIMPLE_FS_PROTOCOL+8] # EFI_SIMPLE_FILE_SYSTEM_PROTOCOL_GUID (last 64 bits) mov rdx, [SIMPLE_FS_PROTOCOL+8] # EFI_SIMPLE_FILE_SYSTEM_PROTOCOL_GUID (last 64 bits)
mov [rsp+56], rdx # save onto stack mov [rsp+56], rdx # save onto stack
lea rdx, [rsp+48] # arg2 = &EFI_SIMPLE_FILE_SYSTEM_PROTOCOL_GUID lea rdx, [rsp+48] # arg2 = &EFI_SIMPLE_FILE_SYSTEM_PROTOCOL_GUID
lea r8, [rsp+64] # arg3 = &root_fs lea r8, [rsp+64] # arg3 = &rootfs
mov r9, [ImageHandle] # arg4 = image_handle mov r9, [ImageHandle] # arg4 = image_handle
mov qword ptr [rsp+32], 0 # arg5 = NULL mov qword ptr [rsp+32], 0 # arg5 = NULL
mov qword ptr [rsp+40], 1 # arg6 = EFI_OPEN_PROTOCOL_BY_HANDLE_PROTOCOL mov qword ptr [rsp+40], 1 # arg6 = EFI_OPEN_PROTOCOL_BY_HANDLE_PROTOCOL
mov rax, [SystemBoot] # system->boot mov rax, [SystemBoot] # system->boot
call [rax+280] # system->boot->open_protocol(); call [rax+280] # system->boot->open_protocol();
mov r8, [rsp+64] # get root_fs
add rsp, 144 # deallocate stack
pop r8 # out # Get root fs
mov rcx, [rsp+64] # get rootfs
add rsp, 72 # deallocate stacks
sub rsp, 32 # allocate stack
lea rdx, [rsp+24] # arg2 = &rootdir
call [rcx+8] # rootfs->open_volume(rootfs, &rootdir)
# Open file for writing
mov rcx, [rsp+24] # arg1 = rootdir
add rsp, 32 # deallocate stack
pop r8 # arg3 = out
sub rsp, 48 # allocate stack
lea rdx, [rsp+40] # arg2 = &fout
mov r9, 0x8000000000000003 # arg4 = EFI_FILE_MODE_CREATE| EFI_FILE_MODE_WRITE | EFI_FILE_MODE_READ
mov qword ptr [rsp+32], 0 # arg5 = 0
call [rcx+8] # rootdir->open()
add rsp, 48 # deallocate stack
pop r8 # in pop r8 # in
Done: Done:
@ -90,10 +109,10 @@ LOADED_IMAGE_PROTOCOL:
.long 0x5b1b31a1 .long 0x5b1b31a1
.short 0x9562 .short 0x9562
.short 0x11d2 .short 0x11d2
.byte 0x8e, 0x3f, 0x00, 0xa0, 0xc9, 0x69, 0x72, 0x3b .byte 0x8e, 0x3f, 0x00, 0xa0, 0xc9, 0x69, 0x72, 0x3b
SIMPLE_FS_PROTOCOL: SIMPLE_FS_PROTOCOL:
.long 0x0964e5b22 .long 0x0964e5b22
.short 0x6459 .short 0x6459
.short 0x11d2 .short 0x11d2
.byte 0x8e, 0x39, 0x00, 0xa0, 0xc9, 0x69, 0x72, 0x3b .byte 0x8e, 0x39, 0x00, 0xa0, 0xc9, 0x69, 0x72, 0x3b