hex0.S: move global variables to stack.
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71bca6e471
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555caea6c7
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@ -10,13 +10,21 @@
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# First four arguments are passed via registers rcx, rdx, r8, r9 (if they fit in 64-bits)
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# but we need to leave stack space
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# Registers:
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# rsi rootdir
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# r12 in/fin: input file name, later reused for handle
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# r13 out/fout: output file name, later reused for handle
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# r14 system->boot from UEFI, later reused for hex0 algorithm
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# r15 image_handle from UEFI, later reused for hex0 algorithm
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.global _start
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.text
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_start:
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mov [ImageHandle], rcx # ImageHandle *image_handle
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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 [SystemBoot], rax # save system->boot
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mov r14, rax # save system->boot
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# Open Loaded Image protocol
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sub rsp, 72 # allocate stack
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@ -35,7 +43,6 @@ _start:
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# Command line args
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mov rax, [rsp+64] # get image
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add rsp, 72 # deallocate stack
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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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@ -46,7 +53,8 @@ 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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#push rax # in = options
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mov r12, rax
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loop_options2: # Skip argv[1]
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add rax, 2 # ++options
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@ -56,7 +64,8 @@ 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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#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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@ -67,43 +76,39 @@ loop_options2: # Skip argv[1]
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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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mov r9, [ImageHandle] # arg4 = image_handle
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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, [SystemBoot] # system->boot
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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, [rsp+64] # get rootfs
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# Get root fs
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mov rcx, [rsp+64] # get rootfs
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add rsp, 72 # deallocate stacks
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sub rsp, 24 # allocate stack
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lea rdx, [RootDir] # arg2 = &rootdir
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lea rdx, [rsp+16] # arg2 = &rootdir
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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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add rsp, 24 # deallocate stack
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mov rcx, [RootDir] # arg1 = rootdir
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pop r8 # arg3 = out
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sub rsp, 40 # allocate stack
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lea rdx, [fout] # arg2 = &fout
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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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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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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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add rsp, 40 # deallocate stack
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mov rcx, [RootDir] # arg1 = rootdir
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pop r8 # arg3 = in
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sub rsp, 40 # allocate stack
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lea rdx, [fin] # arg2 = &fin
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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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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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call [rcx+8] # rootdir->open()
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add rsp, 40 # deallocate stack
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mov r12, [rsp+40] # get fin
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# Our flag for byte processing
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push -1
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@ -213,17 +218,17 @@ ascii_other:
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ret
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terminate:
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sub rsp, 8 # allocate stack
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mov rcx, [fin] # arg1 = fin
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push rbx # allocate stack
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mov rcx, r12 # arg1 = fin
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call [rcx+16] # fin->close()
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mov rcx, [fout] # arg1 = fout
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mov rcx, r13 # arg1 = fin
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call [rcx+16] # fout->close()
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add rsp, 16 # deallocate stack
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mov rsp, rbp # restore stack
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ret # return to UEFI
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read_byte:
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mov rcx, [fin] # arg1 = fin
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mov rcx, r12 # arg1 = fin
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push 1 # size = 1
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mov rdx, rsp # arg2 = &size
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push rbx # allocate stack
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@ -242,7 +247,7 @@ read_byte:
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# Writes byte stored in al
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write_byte:
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mov rcx, [fout] # arg1 = fout
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mov rcx, r13 # arg1 = fout
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push 1 # size = 1
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mov rdx, rsp # arg2 = &size
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push rax # allocate stack
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@ -254,12 +259,6 @@ write_byte:
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ret # return
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.data
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ImageHandle: .quad 0
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SystemBoot: .quad 0
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RootDir: .quad 0
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fin: .quad 0
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fout: .quad 0
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# Protocol GUIDs
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LOADED_IMAGE_PROTOCOL:
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.long 0x5b1b31a1
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