700 lines
24 KiB
ArmAsm
700 lines
24 KiB
ArmAsm
# SPDX-FileCopyrightText: 2022 Andrius Štikonas <andrius@stikonas.eu>
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# SPDX-FileCopyrightText: 2017 Jeremiah Orians <jeremiah@pdp10.guru>
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#
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# SPDX-License-Identifier: GPL-3.0-or-later
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.global _start
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.text
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# Register usage:
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# R15 => Flag
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# R14 => High bits
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# R13 => IP
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# R12 => MALLOC
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# R11 => HEAD
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# Struct format: (size 24)
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# NEXT => 0
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# TARGET => 8
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# NAME => 16
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# efi_main(void *image_handle, struct efi_system_table *system)
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_start:
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mov rbp, rsp # save stack pointer
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mov [rip+image_handle], rcx # save image_handle
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mov r14, [rdx+96] # system->boot
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mov [rip+SystemBoot], r14 # save system->boot
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# Open Loaded Image protocol
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mov r9, [rip+image_handle] # arg4 = image_handle
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lea rdx, [rip+LOADED_IMAGE_PROTOCOL] # guid = &LOADED_IMAGE_PROTOCOL
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mov rcx, r9 # arg1 = image_handle
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call open_protocol # open protocol
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mov rdi, rax # save image
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# Get root file system
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mov r9, [rip+image_handle] # arg4 = image_handle
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lea rdx, [rip+SIMPLE_FS_PROTOCOL] # guid = &SIMPLE_FS_PROTOCOL
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mov rcx, [rdi+24] # arg1 = root_device = image->device
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mov [rip+root_device], rdi # save root_device
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call open_protocol # open protocol
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mov rcx, rax # get rootfs
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# Get root directory
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lea rdx, [rip+rootdir] # arg2 = &rootdir
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push rax # allocate shadow stack space for UEFI function
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push rax # allocate shadow stack space for UEFI function
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call [rcx+8] # rootfs->open_volume(rootfs, &rootdir)
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pop rax # deallocate stack
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pop rax # deallocate stack
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# Push command line arguments onto stack
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mov rbx, [rdi+56] # options = image->load_options
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mov rdx, rbx # save beginning of load_options
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add rbx, [rdi+48] # go to the end of load_options
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push 0 # Save end of arguments (NULL) onto stack
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loop_options:
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cmp rbx, rdx # Check if we are done
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je loop_options_done # We are done
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sub rbx, 2 # --options
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mov al, [rbx] # *options
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cmp al, 0x20 # if *options != ' '
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jne loop_options # then continue looping
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mov BYTE PTR [rbx], 0 # zero it
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add rbx, 2 # ++options
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push rbx # push another argument onto stack
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jmp loop_options # next argument
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loop_options_done:
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# Open file for reading
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pop r8 # arg3 = in
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push 1 # Set exit code in case of failure
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cmp r8, 0 # If NULL
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je failed_input # then exit
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lea rdx, [rip+fin] # arg2 = &fin
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push 1 # arg5 = EFI_FILE_READ_ONLY
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push 1 # prepare to set arg4 to EFI_FILE_MODE_READ
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pop r9 # arg4 = EFI_FILE_MODE_READ
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mov rcx, [rip+rootdir] # arg1 = rootdir
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sub rsp, 32 # allocate shadow stack space for UEFI function
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call [rcx+8] # rootdir->open()
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cmp rax, 0 # If failed to open
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jne failed_input # then exit
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add rsp, 48 # deallocate stack
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# Open file for writing
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pop r8 # arg3 = out
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push 1 # Set exit code in case of failure
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cmp r8, 0 # If NULL
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je failed_output # then exit
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lea rdx, [rip+fout] # arg2 = &fout
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push 0 # arg5 = 0
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push 7 # to get 0x8000000000000003 we set the rightmost 3 bits
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pop r9 # and then do right rotation by 1
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ror r9 # arg4 = EFI_FILE_MODE_CREATE| EFI_FILE_MODE_WRITE | EFI_FILE_MODE_READ
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mov rcx, [rip+rootdir] # arg1 = rootdir
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sub rsp, 32 # allocate shadow stack space for UEFI function
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call [rcx+8] # rootdir->open()
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add rsp, 48 # deallocate stack
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# Allocate ourselves 16 MiB of memory
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mov rdx, 0x1000000 # allocate 16 MiB of memory
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call allocate_pool
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mov [rip+scratch], rax # Allocate space for scratch area
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add rax, 0x800 # 2 KiB of scratch
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mov r12, rax # save structs pointer
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call ClearScratch # Zero scratch
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mov r15, -1 # Our flag for byte processing
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mov r14, 0 # temp storage for the sum
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mov r13, 0x00600000 # Our starting IP
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mov r11, 0 # HEAD = NULL
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call First_pass # Process it
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# rewind input file
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push r11 # Protect r11
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mov rcx, [rip+fin] # Using our input file
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xor edx, edx # Offset Zero
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push rax # allocate shadow stack space for UEFI function
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push rax # allocate shadow stack space for UEFI function
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call [rcx+56] # fin->set_position(fin, 0)
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pop rax # deallocate stack
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pop rax # deallocate stack
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pop r11 # restore r11
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mov r15, -1 # Our flag for byte processing
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mov r14, 0 # temp storage for the sum
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mov r13, 0x00600000 # Our starting IP
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call Second_pass # Process it
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jmp Done
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First_pass:
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call Read_byte
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# Deal with EOF
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cmp rax, -4
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je First_pass_done
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# Check for :
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cmp rax, 0x3a
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jne First_pass_0
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# Deal with label
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jmp StoreLabel
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First_pass_0:
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# Check for !
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cmp rax, 0x21
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je First_pass_pointer
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# Check for @
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cmp rax, 0x40
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je First_pass_pointer
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# Check for $
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cmp rax, 0x24
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je First_pass_pointer
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# Check for %
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cmp rax, 0x25
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je First_pass_pointer
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# Check for &
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cmp rax, 0x26
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je First_pass_pointer
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# Deal with everything else
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call hex # Process our char
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# Deal with EOF
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cmp rax, -4
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je First_pass_done
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# deal with -1 values
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cmp rax, 0
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jl First_pass
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# deal with toggle
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cmp r15, 0
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je First_pass_1
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add r13, 1 # Increment IP
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First_pass_1:
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not r15
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jmp First_pass
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Update_Pointer:
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# Check for !
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cmp rax, 0x21
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je Update_Pointer_1
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# Check for @
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cmp rax, 0x40
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je Update_Pointer_2
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# Check for $
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cmp rax, 0x24
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je Update_Pointer_2
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# Check for %
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cmp rax, 0x25
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je Update_Pointer_4
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# Check for &
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cmp rax, 0x26
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je Update_Pointer_4
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# deal with bad input
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call fail
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Update_Pointer_4:
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add r13, 2 # Increment IP
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Update_Pointer_2:
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add r13, 1 # Increment IP
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Update_Pointer_1:
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add r13, 1 # Increment IP
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ret
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First_pass_pointer:
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# Deal with Pointer to label
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call Update_Pointer # Increment IP
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mov rbx, [rip+scratch] # Using scratch
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call consume_token # Read token
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call ClearScratch # Throw away token
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cmp rax, 0x3E # check for '>'
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jne First_pass # Loop again
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# Deal with %label>label case
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mov rbx, [rip+scratch] # Write to scratch
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call consume_token # get token
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call ClearScratch # Clean up after ourselves
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jmp First_pass # Loop again
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First_pass_done:
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ret
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hex:
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# deal with EOF
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cmp rax, -4
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je EOF
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# deal with line comments starting with #
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cmp rax, 0x23
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je ascii_comment
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# deal with line comments starting with ;
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cmp rax, 0x3b
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je ascii_comment
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# deal all ascii less than 0
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cmp rax, 0x30
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jl ascii_other
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# deal with 0-9
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cmp rax, 0x3a
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jl ascii_num
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# deal with all ascii less than A
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cmp rax, 0x41
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jl ascii_other
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# deal with A-F
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cmp rax, 0x47
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jl ascii_high
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# deal with all ascii less than a
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cmp rax, 0x61
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jl ascii_other
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# deal with a-f
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cmp rax, 0x67
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jl ascii_low
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# The rest that remains needs to be ignored
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jmp ascii_other
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Second_pass:
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call Read_byte
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# Deal with EOF
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cmp rax, -4
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je Second_pass_done
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# Simply drop the label
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cmp rax, 0x3a
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jne Second_pass_0
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mov rbx, [rip+scratch] # Using scratch
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call consume_token # Read token
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call ClearScratch # Throw away token
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jmp Second_pass
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Second_pass_0:
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# Deal with % pointer
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cmp rax, 0x25
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je StorePointer_rel4
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# Deal with @ pointer
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cmp rax, 0x40
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je StorePointer_rel2
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# Deal with ! pointer
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cmp rax, 0x21
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je StorePointer_rel1
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# Deal with & pointer
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cmp rax, 0x26
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je StorePointer_abs4
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# Deal with $ pointer
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cmp rax, 0x24
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je StorePointer_abs2
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Second_pass_1:
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# Deal with everything else
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call hex # Process our char
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# Deal with EOF
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cmp rax, -4
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je Second_pass_done
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# deal with -1 values
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cmp rax, 0
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jl Second_pass
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# deal with toggle
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cmp r15, 0
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je print
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# process first byte of pair
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mov r14, rax
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mov r15, 0
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jmp Second_pass
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Second_pass_done:
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EOF:
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ret
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ascii_num:
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sub rax, 0x30
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ret
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ascii_low:
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sub rax, 0x57
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ret
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ascii_high:
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sub rax, 0x37
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ret
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ascii_other:
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mov rax, -1
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ret
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ascii_comment:
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call Read_byte
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cmp rax, 0xd
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je ascii_comment_cr
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cmp rax, 0xa
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jne ascii_comment
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ascii_comment_cr:
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mov rax, -1
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ret
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# process second byte of pair
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print:
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# update the sum and store in output
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shl r14, 4
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add rax, r14
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# flip the toggle
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not r15 # r15 = -1
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mov rdx, 1 # set the size of chars we want
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call print_chars
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add r13, 1 # Increment IP
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jmp Second_pass
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Read_byte:
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push r11 # Protect r11
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mov rcx, [rip+fin] # arg1 = fin
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push 1 # size = 1
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mov rdx, rsp # arg2 = &size
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xor esi, esi # zero rsi
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push rsi # allocate stack
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mov r8, rsp # arg3 = &input
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push rax # allocate shadow stack space for UEFI function
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push rax # allocate shadow stack space for UEFI function
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push rax # allocate shadow stack space for UEFI function
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call [rcx+32] # fin->read()
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pop rax # deallocate stack
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pop rax # deallocate stack
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pop rax # deallocate stack
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pop rax # save input to rax
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pop rsi # save size to rsi
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pop r11 # restore r11
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# If the file ended (0 bytes read) return EOF
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test esi, esi # if size == 0
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jne Read_byte_1
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mov rax, -4 # Put EOF in rax
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Read_byte_1:
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ret # return
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# Writes bytes stored in rax
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print_chars:
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push r11 # Protect r11
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mov rcx, [rip+fout] # arg1 = fout
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push rdx # set size
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mov rdx, rsp # arg2 = &size
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push rax # allocate stack
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mov r8, rsp # arg3 = &output
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push rax # allocate shadow stack space for UEFI function
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push rax # allocate shadow stack space for UEFI function
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push rax # allocate shadow stack space for UEFI function
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call [rcx+40] # fout->write()
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add rsp, 40 # deallocate stack
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pop r11 # restore r11
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ret # return
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# Receives pointer in RBX
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# Writes out char and updates RBX
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consume_token:
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call Read_byte # Consume_token
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# Check for \t
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cmp rax, 0x09
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je consume_token_done
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# Check for \n
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cmp rax, 0x0A
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je consume_token_done
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# Check for ' '
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cmp rax, 0x20
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je consume_token_done
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# Check for '>'
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cmp rax, 0x3E
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je consume_token_done
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# Looks like we are still reading token
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mov [rbx], al # Store char
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add rbx, 1 # Point to next spot
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jmp consume_token # loop until done
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consume_token_done:
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mov rcx, 0 # Pad with nulls
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mov [rbx], rcx
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add rbx, 8
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ret
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StoreLabel:
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mov rax, r12 # ENTRY
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add r12, 24 # CALLOC
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mov [rax+8], r13 # ENTRY->TARGET = IP
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mov [rax], r11 # ENTRY->NEXT = JUMP_TABLE
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mov r11, rax # JUMP_TABLE = ENTRY
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mov [r11+16], r12 # ENTRY->NAME = TOKEN
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mov rbx, r12 # Write Starting after struct
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call consume_token # Collect whole string
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mov r12, rbx # Update HEAP
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jmp First_pass
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GetTarget:
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mov rdi, [rip+scratch] # Reset scratch
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mov rcx, r11 # Grab JUMP_TABLE
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mov rsi, [rcx+16] # I->NAME
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GetTarget_loop:
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mov al, [rsi] # I->NAME[0]
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mov bl, [rdi] # scratch[0]
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movzx rbx, bl # Zero extend
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movzx rax, al # Zero extend
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cmp al, bl # IF TOKEN == I->NAME
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jne GetTarget_miss # Oops
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add rsi, 1
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add rdi, 1
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cmp al, 0
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jne GetTarget_loop # Loop until
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jmp GetTarget_done # Match
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# Miss
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GetTarget_miss:
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mov rcx, [rcx] # I = I->NEXT
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cmp rcx, 0 # IF NULL == I
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je fail # Abort hard
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mov rsi, [rcx+16] # I->NAME
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mov rdi, [rip+scratch] # Reset scratch
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jmp GetTarget_loop
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GetTarget_done:
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mov rax, [rcx+8] # Get address
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ret
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ClearScratch:
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push rax # Protect against changes
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push rbx # And overwrites
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push rcx
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push rdx # While we work
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mov rbx, [rip+scratch] # Where our scratch area is
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mov al, 0 # Using null
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mov rdx, rbx # Get scratch
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add rdx, 0x800 # end of scratch area
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ClearScratch_loop:
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cmp rbx, rdx # Make sure
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je ClearScratch_end # we do not overflow
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mov rcx, [rbx] # Get current value
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mov [rbx], al # Because we want null
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add rbx, 1 # Increment
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cmp rcx, 0 # Check if we hit null
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jne ClearScratch_loop # Keep looping
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ClearScratch_end:
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pop rdx
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pop rcx # Don't Forget to
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pop rbx # Restore Damage
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pop rax # Entirely
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ret
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StorePointer:
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call Update_Pointer # Increment IP
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mov rbx, [rip+scratch] # Write to scratch
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call consume_token # get token
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push rax # Protect base_sep_p
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mov rax, [rip+scratch] # Pointer to scratch
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call GetTarget # Get address of pointer
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call ClearScratch # Clean up after ourselves
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mov rdx, r13 # base = IP
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pop rbx # Restore base_sep_p
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cmp rbx, 0x3E # If base_sep_p == '>'
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jne StorePointer_done # If not
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# Deal with %label>label case
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push rax # We need to preserve main target
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mov rbx, [rip+scratch] # Write to scratch
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call consume_token # get token
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mov rax, [rip+scratch] # Pointer to scratch
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call GetTarget # Get address of pointer
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call ClearScratch # Clean up after ourselves
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mov rdx, rax # Use our new base
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pop rax # Restore main target
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StorePointer_done:
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ret
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StorePointer_rel4:
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call StorePointer # Do Common
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sub rax, rdx # target - ip
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mov rdx, 4 # set the size of chars we want
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call print_chars
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jmp Second_pass
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StorePointer_rel2:
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call StorePointer # Do Common
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sub rax, rdx # target - ip
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mov rdx, 2 # set the size of chars we want
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call print_chars
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jmp Second_pass
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StorePointer_rel1:
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call StorePointer # Do Common
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sub rax, rdx # target - ip
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mov rdx, 1 # set the size of chars we want
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call print_chars
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jmp Second_pass
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StorePointer_abs4:
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call StorePointer # Do Common
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mov rdx, 4 # set the size of chars we want
|
|
call print_chars
|
|
jmp Second_pass
|
|
|
|
StorePointer_abs2:
|
|
call StorePointer # Do Common
|
|
mov rdx, 2 # set the size of chars we want
|
|
call print_chars
|
|
jmp Second_pass
|
|
|
|
fail:
|
|
mov rax, 1 # Set exit code 1
|
|
jmp terminate
|
|
|
|
Done:
|
|
xor eax, eax # Set exit code 0
|
|
|
|
terminate:
|
|
# Free pool
|
|
push rax # save exit code
|
|
|
|
mov r14, [rip+SystemBoot] # get system->boot
|
|
mov rcx, [rip+scratch] # arg1 = scratch
|
|
push rax # allocate shadow stack space for UEFI function
|
|
call [r14+72] # system->boot->free_pool(scratch)
|
|
pop rax # deallocate stack
|
|
|
|
mov rcx, [rip+fout] # get fout
|
|
call close_file # close fout
|
|
|
|
failed_output:
|
|
mov rcx, [rip+fin] # get fin
|
|
call close_file # close fin
|
|
|
|
failed_input:
|
|
mov rcx, [rip+rootdir] # get rootdir
|
|
call close_file # close rootdir
|
|
|
|
mov r8, [rip+image_handle] # arg3 = image_handle
|
|
lea rdx, [rip+SIMPLE_FS_PROTOCOL] # guid = &SIMPLE_FS_PROTOCOL
|
|
mov rcx, [rip+root_device] # arg1 = root_device
|
|
call close_protocol # close protocol
|
|
|
|
mov r8, [rip+image_handle] # arg3 = image_handle
|
|
lea rdx, [rip+LOADED_IMAGE_PROTOCOL] # guid = &LOADED_IMAGE_PROTOCOL
|
|
mov rcx, r8 # arg1 = image_handle
|
|
call close_protocol # close protocol
|
|
|
|
pop rax # restore exit code
|
|
|
|
abort: # used for debugging only
|
|
mov rsp, rbp # restore stack
|
|
ret # return to UEFI
|
|
|
|
# rcx: file handle
|
|
close_file:
|
|
push rax # allocate shadow stack space for UEFI function
|
|
call [rcx+16] # file_handle->close(file_handle)
|
|
pop rax # deallocate stack
|
|
ret
|
|
|
|
# rcx: handle
|
|
# rdx: &guid
|
|
# r9: agent_handle
|
|
# returns interface
|
|
open_protocol:
|
|
push rax # allocate stack for interface
|
|
mov r8, rsp # arg3 = &interface
|
|
push 1 # arg6 = EFI_OPEN_PROTOCOL_BY_HANDLE_PROTOCOL
|
|
push 0 # arg5 = NULL
|
|
sub rsp, 32 # allocate shadow stack space for UEFI function
|
|
call [r14+280] # system->boot->open_protocol(handle, &guid, &interface, agent_handle, 0, EFI_OPEN_PROTOCOL_BY_HANDLE_PROTOCOL)
|
|
add rsp, 48 # deallocate stack
|
|
pop rax # get interface
|
|
ret
|
|
|
|
# rcx: handle
|
|
# rdx: &guid
|
|
# r8: agent_handle
|
|
close_protocol:
|
|
xor r9, r9 # arg4 = NULL
|
|
sub rsp, 32 # allocate shadow stack space for UEFI function
|
|
call [r14+288] # system->boot->close_protocol(handle, &guid, agent_handle, 0)
|
|
add rsp, 32 # deallocate stack
|
|
ret
|
|
|
|
# rdx: number of bytes to allocate
|
|
# r14: system->boot
|
|
# returns pointer in rax
|
|
allocate_pool:
|
|
push rdx # allocate stack for pool pointer
|
|
mov r8, rsp # arg3 = &pool
|
|
push 2
|
|
pop rcx # arg1 = EFI_LOADER_DATA
|
|
sub rsp, 24 # allocate shadow stack space for UEFI
|
|
call [r14+64] # system->boot->allocate_pool(EFI_LOADER_DATA, 2048, &pool)
|
|
add rsp, 24 # deallocate stack
|
|
pop rax # get pool
|
|
ret
|
|
|
|
|
|
# Protocol GUIDs
|
|
LOADED_IMAGE_PROTOCOL:
|
|
.long 0x5b1b31a1
|
|
.short 0x9562
|
|
.short 0x11d2
|
|
.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
|
|
|
|
fin:
|
|
.long 0, 0
|
|
|
|
fout:
|
|
.long 0, 0
|
|
|
|
scratch:
|
|
.long 0, 0
|
|
|
|
rootdir:
|
|
.long 0, 0
|
|
|
|
SystemBoot:
|
|
.long 0, 0
|
|
|
|
image_handle:
|
|
.long 0, 0
|
|
|
|
root_device:
|
|
.long 0, 0
|