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Further hex0 size reduction and calling convention fixes.

This commit is contained in:
Andrius Štikonas 2023-12-16 17:09:51 +00:00
parent 2e2f608c31
commit 20c3bfbb99
4 changed files with 47 additions and 99 deletions
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28
amd64/Development/hex0.M1
View File

@ -31,7 +31,6 @@ DEFINE jmp EB
DEFINE jne 75 DEFINE jne 75
DEFINE lea_rdx,[rip+DWORD] 488D15 DEFINE lea_rdx,[rip+DWORD] 488D15
DEFINE mov_edi,eax 89C7 DEFINE mov_edi,eax 89C7
DEFINE mov_rbp,rsp 4889E5
DEFINE mov_rcx,rbx 4889D9 DEFINE mov_rcx,rbx 4889D9
DEFINE mov_rcx,rsi 4889F1 DEFINE mov_rcx,rsi 4889F1
DEFINE mov_rcx,r8 4C89C1 DEFINE mov_rcx,r8 4C89C1
@ -40,14 +39,11 @@ DEFINE mov_rcx,r12 4C89E1
DEFINE mov_rcx,r13 4C89E9 DEFINE mov_rcx,r13 4C89E9
DEFINE mov_rdx,rbx 4889DA DEFINE mov_rdx,rbx 4889DA
DEFINE mov_rdx,rsp 4889E2 DEFINE mov_rdx,rsp 4889E2
DEFINE mov_rsp,rbp 4889EC
DEFINE mov_rsp,r15 4C89FC
DEFINE mov_r8,rsp 4989E0 DEFINE mov_r8,rsp 4989E0
DEFINE mov_r8,r15 4D89F8 DEFINE mov_r8,r15 4D89F8
DEFINE mov_r9,r15 4D89F9 DEFINE mov_r9,r15 4D89F9
DEFINE mov_r13,rcx 4989CD DEFINE mov_r13,rcx 4989CD
DEFINE mov_r15,rcx 4989CF DEFINE mov_r15,rcx 4989CF
DEFINE mov_r15,rsp 4989E7
DEFINE mov_al,[rbx] 8A03 DEFINE mov_al,[rbx] 8A03
DEFINE mov_[rbx], C603 DEFINE mov_[rbx], C603
DEFINE mov_rbx,[rdi+BYTE] 488B5F DEFINE mov_rbx,[rdi+BYTE] 488B5F
@ -97,7 +93,6 @@ DEFINE xor_r9,r9 4D31C9
:_start :_start
# Save non-volatile registers # Save non-volatile registers
push_rbp push_rbp
mov_rbp,rsp
push_rbx push_rbx
push_rdi push_rdi
push_rsi push_rsi
@ -139,11 +134,9 @@ DEFINE xor_r9,r9 4D31C9
# Get root directory # Get root directory
push_rax # allocate stack for rootdir push_rax # allocate stack for rootdir
mov_rdx,rsp # arg2 = &rootdir mov_rdx,rsp # arg2 = &rootdir
push_rax # allocate shadow stack space for UEFI function sub_rsp, !32 # allocate shadow stack space for UEFI function
push_rax # allocate shadow stack space for UEFI function
call_[rcx+BYTE] !8 # rootfs->open_volume(rootfs, &rootdir) call_[rcx+BYTE] !8 # rootfs->open_volume(rootfs, &rootdir)
pop_rax # deallocate stack add_rsp, !32 # deallocate stack
pop_rax # deallocate stack
pop_rsi # get rootdir pop_rsi # get rootdir
# Push command line arguments onto stack # Push command line arguments onto stack
@ -194,9 +187,7 @@ DEFINE xor_r9,r9 4D31C9
# Save variables that are needed for cleanup # Save variables that are needed for cleanup
push_r14 # save system->boot push_r14 # save system->boot
push_r15 # save image_handle
push_rsi # save rootdir push_rsi # save rootdir
mov_r15,rsp # save stack location for cleanup
# Our flag for byte processing # Our flag for byte processing
push !-1 push !-1
@ -305,15 +296,12 @@ DEFINE xor_r9,r9 4D31C9
push_rsp # align stack to 16 bytes push_rsp # align stack to 16 bytes
push_[rsp] # align stack to 16 bytes push_[rsp] # align stack to 16 bytes
and_rsp, !-16 # align stack to 16 bytes and_rsp, !-16 # align stack to 16 bytes
push_rax # make sure next call is aligned to 16 bytes
mov_rcx,r13 # arg1 = fout mov_rcx,r13 # arg1 = fout
push !1 # size = 1 push !1 # size = 1
mov_rdx,rsp # arg2 = &size mov_rdx,rsp # arg2 = &size
push_rax # allocate stack push_rax # allocate stack
mov_r8,rsp # arg3 = &output mov_r8,rsp # arg3 = &output
push_rax # allocate shadow stack space for UEFI function sub_rsp, !32 # allocate shadow stack space for UEFI function
push_rax # allocate shadow stack space for UEFI function
push_rax # allocate shadow stack space for UEFI function
call_[rcx+BYTE] !40 # fout->write() call_[rcx+BYTE] !40 # fout->write()
mov_rsp,[rsp+BYTE] !56 # deallocate stack mov_rsp,[rsp+BYTE] !56 # deallocate stack
@ -328,10 +316,7 @@ DEFINE xor_r9,r9 4D31C9
push_rsp # align stack to 16 bytes push_rsp # align stack to 16 bytes
push_[rsp] # align stack to 16 bytes push_[rsp] # align stack to 16 bytes
and_rsp, !-16 # align stack to 16 bytes and_rsp, !-16 # align stack to 16 bytes
push_rax # make sure next call is aligned to 16 bytes sub_rsp, !32 # allocate shadow stack space for UEFI function
push_rax # allocate shadow stack space for UEFI function
push_rax # allocate shadow stack space for UEFI function
push_rax # allocate shadow stack space for UEFI function
call_[rcx+BYTE] !32 # fin->read() call_[rcx+BYTE] !32 # fin->read()
mov_rsp,[rsp+BYTE] !40 # deallocate stack mov_rsp,[rsp+BYTE] !40 # deallocate stack
pop_rax # save input to rax pop_rax # save input to rax
@ -344,9 +329,8 @@ DEFINE xor_r9,r9 4D31C9
ret # return ret # return
:terminate :terminate
mov_rsp,r15 # restore stack location for cleanup pop_rax # deallocate stack (return code of read_byte)
pop_rsi # restore rootdir pop_rsi # restore rootdir
pop_r15 # restore image_handle
pop_r14 # restore system->boot pop_r14 # restore system->boot
pop_rbx # restore root_device pop_rbx # restore root_device
@ -370,6 +354,7 @@ DEFINE xor_r9,r9 4D31C9
mov_rcx,r8 # arg1 = image_handle mov_rcx,r8 # arg1 = image_handle
xor_r9,r9 # arg4 = NULL xor_r9,r9 # arg4 = NULL
call_[r14+DWORD] %288 # system->boot->close_protocol(image_handle, &guid, image_handle, 0) call_[r14+DWORD] %288 # system->boot->close_protocol(image_handle, &guid, image_handle, 0)
add_rsp, !40 # deallocate stack
# Restore non-volatile registers # Restore non-volatile registers
pop_r15 pop_r15
@ -380,7 +365,6 @@ DEFINE xor_r9,r9 4D31C9
pop_rdi pop_rdi
pop_rbx pop_rbx
mov_rsp,rbp # restore stack
pop_rbp pop_rbp
ret # return to UEFI ret # return to UEFI

24
amd64/Development/hex0.S
View File

@ -20,7 +20,6 @@
_start: _start:
# Save non-volatile registers # Save non-volatile registers
push rbp push rbp
mov rbp, rsp
push rbx push rbx
push rdi push rdi
push rsi push rsi
@ -62,11 +61,9 @@ _start:
# Get root directory # Get root directory
push rax # allocate stack for rootdir push rax # allocate stack for rootdir
mov rdx, rsp # arg2 = &rootdir mov rdx, rsp # arg2 = &rootdir
push rax # allocate shadow stack space for UEFI function sub rsp, 32 # allocate shadow stack space for UEFI function
push rax # allocate shadow stack space for UEFI function
call [rcx+8] # rootfs->open_volume(rootfs, &rootdir) call [rcx+8] # rootfs->open_volume(rootfs, &rootdir)
pop rax # deallocate stack add rsp, 32 # deallocate stack
pop rax # deallocate stack
pop rsi # get rootdir pop rsi # get rootdir
# Push command line arguments onto stack # Push command line arguments onto stack
@ -117,9 +114,7 @@ loop_options_done:
# Save variables that are needed for cleanup # Save variables that are needed for cleanup
push r14 # save system->boot push r14 # save system->boot
push r15 # save image_handle
push rsi # save rootdir push rsi # save rootdir
mov r15, rsp # save stack location for cleanup
# Our flag for byte processing # Our flag for byte processing
push -1 push -1
@ -228,15 +223,12 @@ write_byte:
push rsp # align stack to 16 bytes push rsp # align stack to 16 bytes
push [rsp] # align stack to 16 bytes push [rsp] # align stack to 16 bytes
and rsp, -16 # align stack to 16 bytes and rsp, -16 # align stack to 16 bytes
push rax # make sure next call is aligned to 16 bytes
mov rcx, r13 # arg1 = fout mov rcx, r13 # arg1 = fout
push 1 # size = 1 push 1 # size = 1
mov rdx, rsp # arg2 = &size mov rdx, rsp # arg2 = &size
push rax # allocate stack push rax # allocate stack
mov r8, rsp # arg3 = &output mov r8, rsp # arg3 = &output
push rax # allocate shadow stack space for UEFI function sub rsp, 32 # allocate shadow stack space for UEFI function
push rax # allocate shadow stack space for UEFI function
push rax # allocate shadow stack space for UEFI function
call [rcx+40] # fout->write() call [rcx+40] # fout->write()
mov rsp, [rsp+56] # deallocate stack mov rsp, [rsp+56] # deallocate stack
@ -251,10 +243,7 @@ read_byte:
push rsp # align stack to 16 bytes push rsp # align stack to 16 bytes
push [rsp] # align stack to 16 bytes push [rsp] # align stack to 16 bytes
and rsp, -16 # align stack to 16 bytes and rsp, -16 # align stack to 16 bytes
push rax # make sure next call is aligned to 16 bytes sub rsp, 32 # allocate shadow stack space for UEFI function
push rax # allocate shadow stack space for UEFI function
push rax # allocate shadow stack space for UEFI function
push rax # allocate shadow stack space for UEFI function
call [rcx+32] # fin->read() call [rcx+32] # fin->read()
mov rsp, [rsp+40] # deallocate stack mov rsp, [rsp+40] # deallocate stack
pop rax # save input to rax pop rax # save input to rax
@ -267,9 +256,8 @@ read_byte:
ret # return ret # return
terminate: terminate:
mov rsp, r15 # restore stack location for cleanup pop rax # deallocate stack (return code of read_byte)
pop rsi # restore rootdir pop rsi # restore rootdir
pop r15 # restore image_handle
pop r14 # restore system->boot pop r14 # restore system->boot
pop rbx # restore root_device pop rbx # restore root_device
@ -293,6 +281,7 @@ terminate:
mov rcx, r8 # arg1 = image_handle mov rcx, r8 # arg1 = image_handle
xor r9, r9 # arg4 = NULL xor r9, r9 # arg4 = NULL
call [r14+288] # system->boot->close_protocol(image_handle, &guid, image_handle, 0) call [r14+288] # system->boot->close_protocol(image_handle, &guid, image_handle, 0)
add rsp, 40 # deallocate stack
# Restore non-volatile registers # Restore non-volatile registers
pop r15 pop r15
@ -304,7 +293,6 @@ terminate:
pop rbx pop rbx
abort: # used for debugging only abort: # used for debugging only
mov rsp, rbp # restore stack
pop rbp pop rbp
ret # return to UEFI ret # return to UEFI

26
amd64/Development/hex0.hex2
View File

@ -16,7 +16,6 @@
:_start :_start
# Save non-volatile registers # Save non-volatile registers
55 ; push_rbp 55 ; push_rbp
4889E5 ; mov_rbp,rsp
53 ; push_rbx 53 ; push_rbx
57 ; push_rdi 57 ; push_rdi
56 ; push_rsi 56 ; push_rsi
@ -58,11 +57,9 @@
# Get root directory # Get root directory
50 ; push_rax # allocate stack for rootdir 50 ; push_rax # allocate stack for rootdir
4889E2 ; mov_rdx,rsp # arg2 = &rootdir 4889E2 ; mov_rdx,rsp # arg2 = &rootdir
50 ; push_rax # allocate shadow stack space for UEFI function 4883EC 20 ; sub_rsp, !32 # allocate shadow stack space for UEFI function
50 ; push_rax # allocate shadow stack space for UEFI function
FF51 08 ; call_[rcx+BYTE] !8 # rootfs->open_volume(rootfs, &rootdir) FF51 08 ; call_[rcx+BYTE] !8 # rootfs->open_volume(rootfs, &rootdir)
58 ; pop_rax # deallocate stack 4883C4 20 ; add_rsp, !32 # deallocate stack
58 ; pop_rax # deallocate stack
5E ; pop_rsi # save rootdir 5E ; pop_rsi # save rootdir
# Push command line arguments onto stack # Push command line arguments onto stack
@ -113,9 +110,7 @@
# Save variables that are needed for cleanup # Save variables that are needed for cleanup
4156 ; push_r14 # save system->boot 4156 ; push_r14 # save system->boot
4157 ; push_r15 # save image_handle
56 ; push_rsi # save rootdir 56 ; push_rsi # save rootdir
4989E7 ; mov_r15,rsp # save stack location for cleanup
# Our flag for byte processing # Our flag for byte processing
6A FF ; push !-1 6A FF ; push !-1
@ -224,15 +219,12 @@
54 ; push_rsp # align stack to 16 bytes 54 ; push_rsp # align stack to 16 bytes
FF3424 ; push_[rsp] # align stack to 16 bytes FF3424 ; push_[rsp] # align stack to 16 bytes
4883E4 F0 ; and_rsp, !-16 # align stack to 16 bytes 4883E4 F0 ; and_rsp, !-16 # align stack to 16 bytes
50 ; push_rax # make sure next call is aligned to 16 bytes
4C89E9 ; mov_rcx,r13 # arg1 = fout 4C89E9 ; mov_rcx,r13 # arg1 = fout
6A 01 ; push !1 # size = 1 6A 01 ; push !1 # size = 1
4889E2 ; mov_rdx,rsp # arg2 = &size 4889E2 ; mov_rdx,rsp # arg2 = &size
50 ; push_rax # allocate stack 50 ; push_rax # allocate stack
4989E0 ; mov_r8,rsp # arg3 = &output 4989E0 ; mov_r8,rsp # arg3 = &output
50 ; push_rax # allocate shadow stack space for UEFI function 4883EC 20 ; sub_rsp, !32 # allocate shadow stack space for UEFI function
50 ; push_rax # allocate shadow stack space for UEFI function
50 ; push_rax # allocate shadow stack space for UEFI function
FF51 28 ; call_[rcx+BYTE] !40 # fout->write() FF51 28 ; call_[rcx+BYTE] !40 # fout->write()
488B6424 38 ; mov_rsp,[rsp+BYTE] !56 # deallocate stack 488B6424 38 ; mov_rsp,[rsp+BYTE] !56 # deallocate stack
@ -247,12 +239,9 @@
54 ; push_rsp # align stack to 16 bytes 54 ; push_rsp # align stack to 16 bytes
FF3424 ; push_[rsp] # align stack to 16 bytes FF3424 ; push_[rsp] # align stack to 16 bytes
4883E4 F0 ; and_rsp, !-16 # align stack to 16 bytes 4883E4 F0 ; and_rsp, !-16 # align stack to 16 bytes
50 ; push_rax # make sure next call is aligned to 16 bytes 4883EC 20 ; sub_rsp, !32 # allocate shadow stack space for UEFI function
50 ; push_rax # allocate shadow stack space for UEFI function
50 ; push_rax # allocate shadow stack space for UEFI function
50 ; push_rax # allocate shadow stack space for UEFI function
FF51 20 ; call_[rcx+BYTE] !32 # fin->read() FF51 20 ; call_[rcx+BYTE] !32 # fin->read()
488B6424 10 ; mov_rsp,[rsp+BYTE] !40 # deallocate stack 488B6424 28 ; mov_rsp,[rsp+BYTE] !40 # deallocate stack
58 ; pop_rax # save input to rax 58 ; pop_rax # save input to rax
5E ; pop_rsi # save size to rsi 5E ; pop_rsi # save size to rsi
@ -263,9 +252,8 @@
C3 ; ret # return C3 ; ret # return
:terminate :terminate
4C89FC ; mov_rsp,r15 # restore stack location for cleanup 58 ; pop_rax # deallocate stack (return code of read_byte)
5E ; pop_rsi # restore rootdir 5E ; pop_rsi # restore rootdir
415F ; pop_r15 # restore image_handle
415E ; pop_r14 # restore system->boot 415E ; pop_r14 # restore system->boot
5B ; pop_rbx # restore root_device 5B ; pop_rbx # restore root_device
@ -289,6 +277,7 @@
4C89C1 ; mov_rcx,r8 # arg1 = image_handle 4C89C1 ; mov_rcx,r8 # arg1 = image_handle
4D31C9 ; xor_r9,r9 # arg4 = NULL 4D31C9 ; xor_r9,r9 # arg4 = NULL
41FF96 20010000 ; call_[r14+DWORD] %288 # system->boot->close_protocol(image_handle, &guid, image_handle, 0) 41FF96 20010000 ; call_[r14+DWORD] %288 # system->boot->close_protocol(image_handle, &guid, image_handle, 0)
4883C4 28 ; add_rsp, !40 # deallocate stack
# Restore non-volatile registers # Restore non-volatile registers
415F ; pop_r15 415F ; pop_r15
@ -299,7 +288,6 @@
5F ; pop_rdi 5F ; pop_rdi
5B ; pop_rbx 5B ; pop_rbx
4889EC ; mov_rsp,rbp # restore stack
5D ; pop_rbp 5D ; pop_rbp
C3 ; ret # return to UEFI C3 ; ret # return to UEFI

68
amd64/hex0.hex0
View File

@ -129,9 +129,9 @@ F0 00 # SizeOfOptionalHeader
# [0x148] # [0x148]
# Start of section headers # Start of section headers
00 00 00 00 00 00 00 00 ; Name of the section (empty) but could set to ".text" 00 00 00 00 00 00 00 00 ; Name of the section (empty) but could set to ".text"
06 02 00 00 ; VirtualSize FF 01 00 00 ; VirtualSize
00 10 00 00 ; VirtualAddress 00 10 00 00 ; VirtualAddress
06 02 00 00 ; SizeOfRawData FF 01 00 00 ; SizeOfRawData
70 01 00 00 ; PointerToRawData 70 01 00 00 ; PointerToRawData
00 00 00 00 ; PointerToRelocations 00 00 00 00 ; PointerToRelocations
00 00 00 00 ; PointerToLinenumbers 00 00 00 00 ; PointerToLinenumbers
@ -145,7 +145,6 @@ F0 00 # SizeOfOptionalHeader
# :_start # :_start
# Save non-volatile registers # Save non-volatile registers
55 ; push_rbp 55 ; push_rbp
4889E5 ; mov_rbp,rsp
53 ; push_rbx 53 ; push_rbx
57 ; push_rdi 57 ; push_rdi
56 ; push_rsi 56 ; push_rsi
@ -159,7 +158,7 @@ F0 00 # SizeOfOptionalHeader
# Open Loaded Image protocol # Open Loaded Image protocol
4D89F9 ; mov_r9,r15 # arg4 = image_handle 4D89F9 ; mov_r9,r15 # arg4 = image_handle
488D15 C6010000 ; lea_rdx,[rip+DWORD] %LOADED_IMAGE_PROTOCOL # guid = &LOADED_IMAGE_PROTOCOL 488D15 C2010000 ; lea_rdx,[rip+DWORD] %LOADED_IMAGE_PROTOCOL # guid = &LOADED_IMAGE_PROTOCOL
4C89C9 ; mov_rcx,r9 # arg1 = image_handle 4C89C9 ; mov_rcx,r9 # arg1 = image_handle
50 ; push_rax # allocate stack for image 50 ; push_rax # allocate stack for image
4989E0 ; mov_r8,rsp # arg3 = &image 4989E0 ; mov_r8,rsp # arg3 = &image
@ -172,7 +171,7 @@ F0 00 # SizeOfOptionalHeader
# Get root file system # Get root file system
4D89F9 ; mov_r9,r15 # arg4 = image_handle 4D89F9 ; mov_r9,r15 # arg4 = image_handle
488D15 B1010000 ; lea_rdx,[rip+DWORD] %SIMPLE_FS_PROTOCOL # guid = &SIMPLE_FS_PROTOCOL 488D15 AD010000 ; lea_rdx,[rip+DWORD] %SIMPLE_FS_PROTOCOL # guid = &SIMPLE_FS_PROTOCOL
488B4F 18 ; mov_rcx,[rdi+BYTE] !24 # arg1 = root_device = image->device 488B4F 18 ; mov_rcx,[rdi+BYTE] !24 # arg1 = root_device = image->device
4989CD ; mov_r13,rcx # save root_device 4989CD ; mov_r13,rcx # save root_device
50 ; push_rax # allocate stack for rootfs 50 ; push_rax # allocate stack for rootfs
@ -187,18 +186,16 @@ F0 00 # SizeOfOptionalHeader
# Get root directory # Get root directory
50 ; push_rax # allocate stack for rootdir 50 ; push_rax # allocate stack for rootdir
4889E2 ; mov_rdx,rsp # arg2 = &rootdir 4889E2 ; mov_rdx,rsp # arg2 = &rootdir
50 ; push_rax # allocate shadow stack space for UEFI function 4883EC 20 ; sub_rsp, !32 # allocate shadow stack space for UEFI function
50 ; push_rax # allocate shadow stack space for UEFI function
FF51 08 ; call_[rcx+BYTE] !8 # rootfs->open_volume(rootfs, &rootdir) FF51 08 ; call_[rcx+BYTE] !8 # rootfs->open_volume(rootfs, &rootdir)
58 ; pop_rax # deallocate stack 4883C4 20 ; add_rsp, !32 # deallocate stack
58 ; pop_rax # deallocate stack
5E ; pop_rsi # save rootdir 5E ; pop_rsi # save rootdir
# Push command line arguments onto stack # Push command line arguments onto stack
488B5F 38 ; mov_rbx,[rdi+BYTE] !56 # options = image->load_options 488B5F 38 ; mov_rbx,[rdi+BYTE] !56 # options = image->load_options
4889DA ; mov_rdx,rbx # save beginning of load_options 4889DA ; mov_rdx,rbx # save beginning of load_options
48035F 30 ; add_rbx,[rdi+BYTE] !48 # go to the end of load_options 48035F 30 ; add_rbx,[rdi+BYTE] !48 # go to the end of load_options
# :loop_options [_start + 0x7B] # :loop_options [_start + 0x7C]
4839D3 ; cmp_rbx,rdx # Check if we are done 4839D3 ; cmp_rbx,rdx # Check if we are done
74 14 ; je !loop_options_done # We are done 74 14 ; je !loop_options_done # We are done
4883EB 02 ; sub_rbx, !2 # --options 4883EB 02 ; sub_rbx, !2 # --options
@ -209,7 +206,7 @@ F0 00 # SizeOfOptionalHeader
4883C3 02 ; add_rbx, !2 # ++options 4883C3 02 ; add_rbx, !2 # ++options
53 ; push_rbx # push another argument onto stack 53 ; push_rbx # push another argument onto stack
EB E7 ; jmp !loop_options # next argument EB E7 ; jmp !loop_options # next argument
# :loop_options_done [_start + 0x94] # :loop_options_done [_start + 0x95]
# Open file for reading # Open file for reading
4158 ; pop_r8 # arg3 = in 4158 ; pop_r8 # arg3 = in
@ -242,9 +239,7 @@ F0 00 # SizeOfOptionalHeader
# Save variables that are needed for cleanup # Save variables that are needed for cleanup
4156 ; push_r14 # save system->boot 4156 ; push_r14 # save system->boot
4157 ; push_r15 # save image_handle
56 ; push_rsi # save rootdir 56 ; push_rsi # save rootdir
4989E7 ; mov_r15,rsp # save stack location for cleanup
# Our flag for byte processing # Our flag for byte processing
6A FF ; push !-1 6A FF ; push !-1
@ -253,7 +248,7 @@ F0 00 # SizeOfOptionalHeader
# temp storage for the sum # temp storage for the sum
31FF ; xor_edi,edi # rdi = 0 31FF ; xor_edi,edi # rdi = 0
# :loop [_start+0xE2] # :loop [_start+0xDE]
# Read a byte # Read a byte
E8 79000000 ; call %read_byte E8 79000000 ; call %read_byte
@ -274,7 +269,7 @@ F0 00 # SizeOfOptionalHeader
EB E8 ; jmp !loop EB E8 ; jmp !loop
# process second byte of pair # process second byte of pair
# :print [_start+0xFA] # :print [_start+0xF6]
# update the sum and store in output # update the sum and store in output
C1E7 04 ; shl_edi, !4 C1E7 04 ; shl_edi, !4
01F8 ; add_eax,edi 01F8 ; add_eax,edi
@ -286,7 +281,7 @@ F0 00 # SizeOfOptionalHeader
EB DA ; jmp !loop EB DA ; jmp !loop
# :hex [_start+0x108] # :hex [_start+0x104]
# Purge Comment Lines (#) # Purge Comment Lines (#)
3C 23 ; cmp_al, !35 3C 23 ; cmp_al, !35
74 1E ; je !purge_comment 74 1E ; je !purge_comment
@ -322,7 +317,7 @@ F0 00 # SizeOfOptionalHeader
# The rest that remains needs to be ignored # The rest that remains needs to be ignored
EB 09 ; jmp !ascii_other EB 09 ; jmp !ascii_other
# :purge_comment [_start+0x12A] # :purge_comment [_start+0x126]
# Read a byte # Read a byte
E8 31000000 ; call %read_byte E8 31000000 ; call %read_byte
@ -332,42 +327,39 @@ F0 00 # SizeOfOptionalHeader
# Otherwise return -1 # Otherwise return -1
# :ascii_other [_start+0x133] # :ascii_other [_start+0x12F]
6A FF ; push !-1 6A FF ; push !-1
58 ; pop_rax # return = -1 58 ; pop_rax # return = -1
C3 ; ret C3 ; ret
# :ascii_num [_start+0x137] # :ascii_num [_start+0x133]
2C 30 ; sub_al, !48 2C 30 ; sub_al, !48
C3 ; ret C3 ; ret
# :ascii_low [_start+0x13A] # :ascii_low [_start+0x136]
2C 20 ; sub_al, !32 # convert to uppercase 2C 20 ; sub_al, !32 # convert to uppercase
# :ascii_high [_start+0x13C] # :ascii_high [_start+0x138]
2C 37 ; sub_al, !55 2C 37 ; sub_al, !55
C3 ; ret C3 ; ret
# Writes byte stored in al # Writes byte stored in al
# :write_byte [_start+0x13F] # :write_byte [_start+0x13B]
54 ; push_rsp # align stack to 16 bytes 54 ; push_rsp # align stack to 16 bytes
FF3424 ; push_[rsp] # align stack to 16 bytes FF3424 ; push_[rsp] # align stack to 16 bytes
4883E4 F0 ; and_rsp, !-16 # align stack to 16 bytes 4883E4 F0 ; and_rsp, !-16 # align stack to 16 bytes
50 ; push_rax # make sure next call is aligned to 16 bytes
4C89E9 ; mov_rcx,r13 # arg1 = fout 4C89E9 ; mov_rcx,r13 # arg1 = fout
6A 01 ; push !1 # size = 1 6A 01 ; push !1 # size = 1
4889E2 ; mov_rdx,rsp # arg2 = &size 4889E2 ; mov_rdx,rsp # arg2 = &size
50 ; push_rax # allocate stack 50 ; push_rax # allocate stack
4989E0 ; mov_r8,rsp # arg3 = &output 4989E0 ; mov_r8,rsp # arg3 = &output
50 ; push_rax # allocate shadow stack space for UEFI function 4883EC 20 ; sub_rsp, !32 # allocate shadow stack space for UEFI function
50 ; push_rax # allocate shadow stack space for UEFI function
50 ; push_rax # allocate shadow stack space for UEFI function
FF51 28 ; call_[rcx+BYTE] !40 # fout->write() FF51 28 ; call_[rcx+BYTE] !40 # fout->write()
488B6424 38 ; mov_rsp,[rsp+BYTE] !56 # deallocate stack 488B6424 38 ; mov_rsp,[rsp+BYTE] !56 # deallocate stack
C3 ; ret # return C3 ; ret # return
# :read_byte [_start+0x160] # :read_byte [_start+0x15C]
4C89E1 ; mov_rcx,r12 # arg1 = fin 4C89E1 ; mov_rcx,r12 # arg1 = fin
6A 01 ; push !1 # size = 1 6A 01 ; push !1 # size = 1
4889E2 ; mov_rdx,rsp # arg2 = &size 4889E2 ; mov_rdx,rsp # arg2 = &size
@ -376,10 +368,7 @@ F0 00 # SizeOfOptionalHeader
54 ; push_rsp # align stack to 16 bytes 54 ; push_rsp # align stack to 16 bytes
FF3424 ; push_[rsp] # align stack to 16 bytes FF3424 ; push_[rsp] # align stack to 16 bytes
4883E4 F0 ; and_rsp, !-16 # align stack to 16 bytes 4883E4 F0 ; and_rsp, !-16 # align stack to 16 bytes
50 ; push_rax # make sure next call is aligned to 16 bytes 4883EC 20 ; sub_rsp, !32 # allocate shadow stack space for UEFI function
50 ; push_rax # allocate shadow stack space for UEFI function
50 ; push_rax # allocate shadow stack space for UEFI function
50 ; push_rax # allocate shadow stack space for UEFI function
FF51 20 ; call_[rcx+BYTE] !32 # fin->read() FF51 20 ; call_[rcx+BYTE] !32 # fin->read()
488B6424 28 ; mov_rsp,[rsp+BYTE] !40 # deallocate stack 488B6424 28 ; mov_rsp,[rsp+BYTE] !40 # deallocate stack
58 ; pop_rax # save input to rax 58 ; pop_rax # save input to rax
@ -391,10 +380,9 @@ F0 00 # SizeOfOptionalHeader
C3 ; ret # return C3 ; ret # return
# :terminate [_start+0x188] # :terminate [_start+0x184]
4C89FC ; mov_rsp,r15 # restore stack location for cleanup 58 ; pop_rax # deallocate stack (return code of read_byte)
5E ; pop_rsi # restore rootdir 5E ; pop_rsi # restore rootdir
415F ; pop_r15 # restore image_handle
415E ; pop_r14 # restore system->boot 415E ; pop_r14 # restore system->boot
5B ; pop_rbx # restore root_device 5B ; pop_rbx # restore root_device
@ -407,17 +395,18 @@ F0 00 # SizeOfOptionalHeader
FF51 10 ; call_[rcx+BYTE] !16 # rootdir->close() FF51 10 ; call_[rcx+BYTE] !16 # rootdir->close()
4D89F8 ; mov_r8,r15 # arg3 = image_handle 4D89F8 ; mov_r8,r15 # arg3 = image_handle
488D15 48000000 ; lea_rdx,[rip+DWORD] %SIMPLE_FS_PROTOCOL # guid = &SIMPLE_FS_PROTOCOL 488D15 49000000 ; lea_rdx,[rip+DWORD] %SIMPLE_FS_PROTOCOL # guid = &SIMPLE_FS_PROTOCOL
4889D9 ; mov_rcx,rbx # arg1 = root_device 4889D9 ; mov_rcx,rbx # arg1 = root_device
4D31C9 ; xor_r9,r9 # arg4 = NULL 4D31C9 ; xor_r9,r9 # arg4 = NULL
4883EC 20 ; sub_rsp, !32 # allocate shadow stack space for UEFI function 4883EC 20 ; sub_rsp, !32 # allocate shadow stack space for UEFI function
41FF96 20010000 ; call_[r14+DWORD] %288 # system->boot->close_protocol(root_device, &guid, image_handle, 0) 41FF96 20010000 ; call_[r14+DWORD] %288 # system->boot->close_protocol(root_device, &guid, image_handle, 0)
4D89F8 ; mov_r8,r15 # arg3 = image_handle 4D89F8 ; mov_r8,r15 # arg3 = image_handle
488D15 1D000000 ; lea_rdx,[rip+DWORD] %LOADED_IMAGE_PROTOCOL # guid = &LOADED_IMAGE_PROTOCOL 488D15 1E000000 ; lea_rdx,[rip+DWORD] %LOADED_IMAGE_PROTOCOL # guid = &LOADED_IMAGE_PROTOCOL
4C89C1 ; mov_rcx,r8 # arg1 = image_handle 4C89C1 ; mov_rcx,r8 # arg1 = image_handle
4D31C9 ; xor_r9,r9 # arg4 = NULL 4D31C9 ; xor_r9,r9 # arg4 = NULL
41FF96 20010000 ; call_[r14+DWORD] %288 # system->boot->close_protocol(image_handle, &guid, image_handle, 0) 41FF96 20010000 ; call_[r14+DWORD] %288 # system->boot->close_protocol(image_handle, &guid, image_handle, 0)
4883C4 28 ; add_rsp, !40 # deallocate stack
# Restore non-volatile registers # Restore non-volatile registers
415F ; pop_r15 415F ; pop_r15
@ -428,22 +417,21 @@ F0 00 # SizeOfOptionalHeader
5F ; pop_rdi 5F ; pop_rdi
5B ; pop_rbx 5B ; pop_rbx
4889EC ; mov_rsp,rbp # restore stack
5D ; pop_rbp 5D ; pop_rbp
C3 ; ret # return to UEFI C3 ; ret # return to UEFI
# Protocol GUIDs # Protocol GUIDs
# :LOADED_IMAGE_PROTOCOL [_start+0x1E6] # :LOADED_IMAGE_PROTOCOL [_start+0x1DF]
A1 31 1B 5B ; %0x5b1b31a1 A1 31 1B 5B ; %0x5b1b31a1
62 95 ; $0x9562 62 95 ; $0x9562
D2 11 ; $0x11d2 D2 11 ; $0x11d2
8E 3F 00 A0 C9 69 72 3B ; !0x8e !0x3f !0 !0xa0 !0xc9 !0x69 !0x72 !0x3b 8E 3F 00 A0 C9 69 72 3B ; !0x8e !0x3f !0 !0xa0 !0xc9 !0x69 !0x72 !0x3b
# :SIMPLE_FS_PROTOCOL [_start+0x1F6] # :SIMPLE_FS_PROTOCOL [_start+0x1EF]
22 5B 4E 96 ; %0x964e5b22 22 5B 4E 96 ; %0x964e5b22
59 64 ; $0x6459 59 64 ; $0x6459
D2 11 ; $0x11d2 D2 11 ; $0x11d2
8E 39 00 A0 C9 69 72 3B ; !0x8e !0x39 !0 !0xa0 !0xc9 !0x69 !0x72 !0x3b 8E 39 00 A0 C9 69 72 3B ; !0x8e !0x39 !0 !0xa0 !0xc9 !0x69 !0x72 !0x3b
# :ELF_end [_start+0x206] # :ELF_end [_start+0x1FF]