hex0.S: more stack optimizations.
Pass function arguments with push opcodes which are shorter than using e.g. "mov qword ptr [rsp+40], 1"
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@ -21,28 +21,27 @@
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.text
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_start:
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mov rbp, rsp # save stack
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mov r15, rcx # image_handle
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mov rax, [rdx+96] # system->boot
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mov r14, rax # save system->boot
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mov rbp, rsp # save stack pointer
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mov r15, rcx # save image_handle
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mov r14, [rdx+96] # save system->boot
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# Open Loaded Image protocol
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sub rsp, 72 # allocate stack
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# arg1 = ImageHandle
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mov rdx, [LOADED_IMAGE_PROTOCOL] # EFI_LOADED_IMAGE_PROTOCOL_GUID (first 64 bits)
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mov [rsp+48], rdx # save onto stack
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push rax # allocate stack for image
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mov r8, rsp # arg3 = &image
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mov rdx, [LOADED_IMAGE_PROTOCOL+8]# EFI_LOADED_IMAGE_PROTOCOL_GUID (last 64 bits)
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mov [rsp+56], rdx # save onto stack
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lea rdx, [rsp+48] # arg2 = &EFI_LOADED_IMAGE_PROTOCOL_GUID
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lea r8, [rsp+64] # arg3 = &image
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push rdx # push last 64 bits onto stack
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mov rdx, [LOADED_IMAGE_PROTOCOL] # EFI_LOADED_IMAGE_PROTOCOL_GUID (first 64 bits)
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push rdx # push first 64 bits onto stack
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mov rdx, rsp # arg2 = &guid
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push 1 # arg6 = EFI_OPEN_PROTOCOL_BY_HANDLE_PROTOCOL
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push 0 # arg5 = NULL
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mov r9, rcx # arg4 = image_handle
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mov qword ptr [rsp+32], 0 # arg5 = NULL
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mov qword ptr [rsp+40], 1 # arg6 = EFI_OPEN_PROTOCOL_BY_HANDLE_PROTOCOL
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call [rax+280] # system->boot->open_protocol();
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# arg1 = ImageHandle (already set)
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sub rsp, 32 # allocate stack
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call [r14+280] # system->boot->open_protocol(image_handle, &guid, &image, image_handle, 0, EFI_OPEN_PROTOCOL_BY_HANDLE_PROTOCOL);
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mov rax, [rsp+64] # get image
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# Command line args
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mov rax, [rsp+64] # get image
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mov rcx, rax # save image
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mov rax, [rax+56] # options = image->load_options
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@ -53,7 +52,6 @@ loop_options1: # Skip application name
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jne loop_options1 # then jump
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add rax, 2 # ++options
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#push rax # in = options
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mov r12, rax
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loop_options2: # Skip argv[1]
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@ -64,49 +62,50 @@ loop_options2: # Skip argv[1]
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mov byte ptr [rax], 0 # *options = 0;
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add rax, 2 # ++options
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#push rax # out = options
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mov r13, rax
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# Get root device
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sub rsp, 72 # allocate stack
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mov rcx, [rcx+24] # arg1 = root_device = image->device
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mov rdx, [SIMPLE_FS_PROTOCOL] # EFI_SIMPLE_FILE_SYSTEM_PROTOCOL_GUID (first 64 bits)
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mov [rsp+48], rdx # save onto stack
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push rax # allocate stack for rootfs
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mov r8, rsp # arg3 = &rootfs
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mov rdx, [SIMPLE_FS_PROTOCOL+8] # EFI_SIMPLE_FILE_SYSTEM_PROTOCOL_GUID (last 64 bits)
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mov [rsp+56], rdx # save onto stack
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lea rdx, [rsp+48] # arg2 = &EFI_SIMPLE_FILE_SYSTEM_PROTOCOL_GUID
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lea r8, [rsp+64] # arg3 = &rootfs
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push rdx # push last 64 bits onto stack
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mov rdx, [SIMPLE_FS_PROTOCOL] # EFI_SIMPLE_FILE_SYSTEM_PROTOCOL_GUID (first 64 bits)
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push rdx # push first 64 bits onto stack
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mov rdx, rsp # arg2 = &guid
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push 1 # arg6 = EFI_OPEN_PROTOCOL_BY_HANDLE_PROTOCOL
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push 0 # arg5 = NULL
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mov r9, r15 # arg4 = image_handle
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mov qword ptr [rsp+32], 0 # arg5 = NULL
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mov qword ptr [rsp+40], 1 # arg6 = EFI_OPEN_PROTOCOL_BY_HANDLE_PROTOCOL
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mov rax, r14 # system->boot
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call [rax+280] # system->boot->open_protocol();
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mov rcx, [rcx+24] # arg1 = root_device = image->device
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sub rsp, 32 # allocate stack
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call [r14+280] # system->boot->open_protocol(root_device, &guid, &rootfs, image_handle, 0, EFI_OPEN_PROTOCOL_BY_HANDLE_PROTOCOL);
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mov rcx, [rsp+64] # get rootfs
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# Get root fs
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sub rsp, 24 # allocate stack
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lea rdx, [rsp+16] # arg2 = &rootdir
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# Get rootfs
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push rdx # allocate stack for rootdir
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mov rdx, rsp # arg2 = &rootdir
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sub rsp, 16 # allocate stack
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call [rcx+8] # rootfs->open_volume(rootfs, &rootdir)
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mov rsi, [rsp+16] # save &rootdir
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# Open file for writing
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sub rsp, 48 # allocate stack
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mov rcx, rsi # arg1 = rootdir
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lea rdx, [rsp+40] # arg2 = &fout
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mov r8, r13 # arg3 = out
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push rdx # allocate stack for fout
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mov rdx, rsp # arg2 = &fout
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push 0 # arg5 = 0
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mov r9, 0x8000000000000003 # arg4 = EFI_FILE_MODE_CREATE| EFI_FILE_MODE_WRITE | EFI_FILE_MODE_READ
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mov qword ptr [rsp+32], 0 # arg5 = 0
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mov r8, r13 # arg3 = out
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mov rcx, rsi # arg1 = rootdir
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sub rsp, 32 # allocate stack
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call [rcx+8] # rootdir->open()
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mov r13, [rsp+40] # get fout
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# Open file for reading
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mov rcx, rsi # arg1 = rootdir
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mov r8, r12 # arg3 = in
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sub rsp, 48 # allocate stack
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lea rdx, [rsp+40] # arg2 = &fin
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push rdx # allocate stack for fin
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mov rdx, rsp # arg2 = &fin
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push 1 # arg5 = EFI_FILE_READ_ONLY
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mov r9, 1 # arg4 = EFI_FILE_MODE_READ
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mov qword ptr [rsp+32], 1 # arg5 = EFI_FILE_READ_ONLY
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mov r8, r12 # arg3 = in
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mov rcx, rsi # arg1 = rootdir
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sub rsp, 32 # allocate stack
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call [rcx+8] # rootdir->open()
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mov r12, [rsp+40] # get fin
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