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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
mov rax, [rsp+64] # get image
add rsp, 72 # deallocate stack
mov rcx, rax # save image
mov rax, [rax+56] # options = image->load_options
@ -52,7 +53,7 @@ loop_options2: # Skip argv[1]
cmp bl, 0x20 # if *options != ' '
jne loop_options2 # then jump
mov qword ptr [rax], # *options = 0;
mov byte ptr [rax], 0 # *options = 0;
add rax, 2 # ++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 [rsp+56], rdx # save onto stack
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 qword ptr [rsp+32], 0 # arg5 = NULL
mov qword ptr [rsp+40], 1 # arg6 = EFI_OPEN_PROTOCOL_BY_HANDLE_PROTOCOL
mov rax, [SystemBoot] # system->boot
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
Done:
@ -90,10 +109,10 @@ LOADED_IMAGE_PROTOCOL:
.long 0x5b1b31a1
.short 0x9562
.short 0x11d2
.byte 0x8e, 0x3f, 0x00, 0xa0, 0xc9, 0x69, 0x72, 0x3b
.byte 0x8e, 0x3f, 0x00, 0xa0, 0xc9, 0x69, 0x72, 0x3b
SIMPLE_FS_PROTOCOL:
.long 0x0964e5b22
.short 0x6459
.short 0x11d2
.byte 0x8e, 0x39, 0x00, 0xa0, 0xc9, 0x69, 0x72, 0x3b
.byte 0x8e, 0x39, 0x00, 0xa0, 0xc9, 0x69, 0x72, 0x3b