Add hex1.S prototype.

main
Andrius Štikonas 2 months ago
parent 217ea25487
commit 368377191b
  1. 2
      Makefile
  2. 2
      amd64/Development/Makefile
  3. 4
      amd64/Development/hex0.S
  4. 378
      amd64/Development/hex1.S

@ -42,7 +42,7 @@ $(build_dir)/esp.img: rootfs
rootfs:
rm -rf $(rootfs_dir)
mkdir -p $(boot_dir)
rsync -av . $(rootfs_dir) --exclude $(build_dir) --exclude ".*" --exclude "Development/" --exclude "*/Development/" --exclude "bootstrap-seeds/"
rsync -av . $(rootfs_dir) --exclude $(build_dir) --exclude ".*" --exclude "bootstrap-seeds/"
mkdir -p $(rootfs_dir)/bootstrap-seeds/UEFI/
rsync -av bootstrap-seeds/UEFI/ $(rootfs_dir)/bootstrap-seeds/UEFI/

@ -9,7 +9,7 @@ lflags = -subsystem:efi_application -nodefaultlib -dll
build = build
all: $(build)/hex0.efi $(build)/kaem-optional.efi
all: $(build)/hex0.efi $(build)/kaem-minimal.efi $(build)/hex1.efi
$(build)/%.o : %.S
mkdir -p $(build)

@ -64,7 +64,7 @@ loop_options2: # Skip argv[1]
cmp al, 0x20 # if *options != ' '
jne loop_options2 # then jump
mov byte ptr [rbx], 0 # *options = 0;
mov byte ptr [rbx], 0 # *options = 0
add rbx, 2 # ++options
mov r13, rbx # save output file
@ -81,7 +81,7 @@ loop_options2: # Skip argv[1]
mov r9, r15 # arg4 = image_handle
mov rcx, [rcx+24] # arg1 = root_device = image->device
sub rsp, 32 # allocate shadow stack space for UEFI function
call r14 # system->boot->open_protocol(root_device, &guid, &rootfs, image_handle, 0, EFI_OPEN_PROTOCOL_BY_HANDLE_PROTOCOL);
call r14 # system->boot->open_protocol(root_device, &guid, &rootfs, image_handle, 0, EFI_OPEN_PROTOCOL_BY_HANDLE_PROTOCOL)
mov rcx, [rsp+64] # get rootfs
# Get root directory

@ -0,0 +1,378 @@
# SPDX-FileCopyrightText: 2022 Andrius Štikonas <andrius@stikonas.eu>
# SPDX-FileCopyrightText: 2017 Jeremiah Orians <jeremiah@pdp10.guru>
#
# SPDX-License-Identifier: GPL-3.0-or-later
.global _start
.text
# efi_main(void *image_handle, struct efi_system_table *system)
_start:
mov rbp, rsp # save stack pointer
mov r15, rcx # save image_handle
mov r14, [rdx+96] # system->boot
mov r14, [r14+280] # system->boot->open_protocol
# Open Loaded Image protocol
push rax # allocate stack for image
mov r8, rsp # arg3 = &image
mov rdx, [rip+LOADED_IMAGE_PROTOCOL+8] # EFI_LOADED_IMAGE_PROTOCOL_GUID (last 64 bits)
push rdx # push last 64 bits onto stack
mov rdx, [rip+LOADED_IMAGE_PROTOCOL] # EFI_LOADED_IMAGE_PROTOCOL_GUID (first 64 bits)
push rdx # push first 64 bits onto stack
mov rdx, rsp # arg2 = &guid
push 1 # arg6 = EFI_OPEN_PROTOCOL_BY_HANDLE_PROTOCOL
push 0 # arg5 = NULL
mov r9, rcx # arg4 = image_handle
# arg1 = ImageHandle (already set)
sub rsp, 32 # allocate shadow stack space for UEFI function
call r14 # system->boot->open_protocol(image_handle, &guid, &image, image_handle, 0, EFI_OPEN_PROTOCOL_BY_HANDLE_PROTOCOL)
mov rax, [rsp+64] # get image
mov rcx, rax # save image
# Command line args
mov rbx, [rax+56] # options = image->load_options
loop_options1: # Skip application name
add rbx, 2 # ++options
mov al, [rbx] # *options
cmp al, 0x20 # if *options != ' '
jne loop_options1 # then jump
add rbx, 2 # ++options
mov r12, rbx # save input file
loop_options2: # Skip argv[1]
add rbx, 2 # ++options
mov al, [rbx] # *options
cmp al, 0x20 # if *options != ' '
jne loop_options2 # then jump
mov byte ptr [rbx], 0 # *options = 0
add rbx, 2 # ++options
mov r13, rbx # save output file
# Get root file system
push rax # allocate stack for rootfs
mov r8, rsp # arg3 = &rootfs
mov rdx, [rip+SIMPLE_FS_PROTOCOL+8] # EFI_SIMPLE_FILE_SYSTEM_PROTOCOL_GUID (last 64 bits)
push rdx # push last 64 bits onto stack
mov rdx, [rip+SIMPLE_FS_PROTOCOL] # EFI_SIMPLE_FILE_SYSTEM_PROTOCOL_GUID (first 64 bits)
push rdx # push first 64 bits onto stack
mov rdx, rsp # arg2 = &guid
push 1 # arg6 = EFI_OPEN_PROTOCOL_BY_HANDLE_PROTOCOL
push 0 # arg5 = NULL
mov r9, r15 # arg4 = image_handle
mov rcx, [rcx+24] # arg1 = root_device = image->device
sub rsp, 32 # allocate shadow stack space for UEFI function
call r14 # system->boot->open_protocol(root_device, &guid, &rootfs, image_handle, 0, EFI_OPEN_PROTOCOL_BY_HANDLE_PROTOCOL)
mov rcx, [rsp+64] # get rootfs
# Get root directory
push rdx # allocate stack for rootdir
mov rdx, rsp # arg2 = &rootdir
push rax # allocate shadow stack space for UEFI function
push rax # allocate shadow stack space for UEFI function
call [rcx+8] # rootfs->open_volume(rootfs, &rootdir)
pop rax # deallocate stack
pop rax # deallocate stack
pop r14 # save &rootdir
# Open file for reading
push rdx # allocate stack for fin
mov rdx, rsp # arg2 = &fin
push 1 # arg5 = EFI_FILE_READ_ONLY
push 1 # prepare to set arg4 to EFI_FILE_MODE_READ
pop r9 # arg4 = EFI_FILE_MODE_READ
mov r8, r12 # arg3 = in
mov rcx, r14 # arg1 = rootdir
sub rsp, 32 # allocate shadow stack space for UEFI function
call [rcx+8] # rootdir->open()
mov rdi, [rsp+40] # get fin
# Open file for writing
push rdx # allocate stack for fout
mov rdx, rsp # arg2 = &fout
push 0 # arg5 = 0
push 7 # to get 0x8000000000000003 we set the rightmost 3 bits
pop r9 # and then do right rotation by 1
ror r9 # arg4 = EFI_FILE_MODE_CREATE| EFI_FILE_MODE_WRITE | EFI_FILE_MODE_READ
mov r8, r13 # arg3 = out
mov rcx, r14 # arg1 = rootdir
sub rsp, 32 # allocate shadow stack space for UEFI function
call [rcx+8] # rootdir->open()
mov rbx, [rsp+40] # get fout
mov r15, -1 # Our flag for byte processing
mov r14, 0 # temp storage for the sum
mov r13, 0 # Our starting IP
call First_pass # Process it
# rewind input file
mov rcx, rdi # Using our input file
xor edx, edx # Offset Zero
push rax # allocate shadow stack space for UEFI function
push rax # allocate shadow stack space for UEFI function
call [rcx+56] # fin->set_position(fin, 0)
pop rax # deallocate stack
pop rax # deallocate stack
mov r15, -1 # Our flag for byte processing
mov r14, 0 # temp storage for the sum
mov r13, 0 # Our starting IP
call Second_pass # Process it
jmp Done
First_pass:
call Read_byte
# Deal with EOF
cmp rax, -4
je First_pass_done
# Check for :
cmp rax, 0x3a
jne First_pass_0
# Deal with label
call StoreLabel
First_pass_0:
# Check for %
cmp rax, 0x25
je First_pass_pointer
# Deal with everything else
call hex # Process our char
# Deal with EOF
cmp rax, -4
je First_pass_done
# deal with -1 values
cmp rax, 0
jl First_pass
# deal with toggle
cmp r15, 0
je First_pass_1
add r13, 1 # Increment IP
First_pass_1:
not r15
jmp First_pass
First_pass_pointer:
# Deal with Pointer to label
call Read_byte # Drop the char
add r13, 4 # Increment IP
jmp First_pass # Loop again
First_pass_done:
RET
hex:
# deal with EOF
cmp rax, -4
je EOF
# deal with line comments starting with #
cmp rax, 0x23
je ascii_comment
# deal with line comments starting with ;
cmp rax, 0x3b
je ascii_comment
# deal all ascii less than 0
cmp rax, 0x30
jl ascii_other
# deal with 0-9
cmp rax, 0x3a
jl ascii_num
# deal with all ascii less than A
cmp rax, 0x41
jl ascii_other
# deal with A-F
cmp rax, 0x47
jl ascii_high
# deal with all ascii less than a
cmp rax, 0x61
jl ascii_other
# deal with a-f
cmp rax, 0x67
jl ascii_low
# The rest that remains needs to be ignored
jmp ascii_other
Second_pass:
call Read_byte
# Deal with EOF
cmp rax, -4
je Second_pass_done
# Simply drop the label
cmp rax, 0x3a
jne Second_pass_0
call Read_byte
jmp Second_pass
Second_pass_0:
# Deal with pointer
cmp rax, 0x25
jne Second_pass_1
call StorePointer
jmp Second_pass
Second_pass_1:
# Deal with everything else
call hex # Process our char
# Deal with EOF
cmp rax, -4
je Second_pass_done
# deal with -1 values
cmp rax, 0
jl Second_pass
# deal with toggle
cmp r15, 0
je print
# process first byte of pair
mov r14, rax
mov r15, 0
jmp Second_pass
Second_pass_done:
ret
EOF:
ret
ascii_num:
sub rax, 0x30
ret
ascii_low:
sub rax, 0x57
ret
ascii_high:
sub rax, 0x37
ret
ascii_other:
mov rax, -1
ret
ascii_comment:
call Read_byte
cmp rax, 0xd
je ascii_comment_cr
cmp rax, 0xa
jne ascii_comment
ascii_comment_cr:
mov rax, -1
ret
# process second byte of pair
print:
# update the sum and store in output
shl r14, 4
add rax, r14
# flip the toggle
dec r15 # rbx = -1
mov rdx, 1 # set the size of chars we want
call print_chars
add r13, 1 # Increment IP
jmp Second_pass
Read_byte:
mov rcx, rdi # arg1 = fin
push 1 # size = 1
mov rdx, rsp # arg2 = &size
push rsi # allocate stack
mov r8, rsp # arg3 = &input
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()
pop rax # deallocate stack
pop rax # deallocate stack
pop rax # deallocate stack
pop rax # save input to rax
pop rsi # save size to rsi
# If the file ended (0 bytes read) return EOF
test esi, esi # if size == 0
jne Read_byte_1
mov rax, -4 # Put EOF in rax
Read_byte_1:
ret # return
# Writes byte stored in al
print_chars:
mov rcx, rbx # arg1 = fout
push rdx # size = 1
mov rdx, rsp # arg2 = &size
push rax # allocate stack
mov r8, rsp # arg3 = &output
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+40] # fout->write()
add rsp, 40 # deallocate stack
ret # return
Get_table_target:
call Read_byte # Get single char label
shl rax, 3 # Each label in table takes 8 bytes to store
add rax, table # Calculate offset
ret
StoreLabel:
call Get_table_target
mov [rax], r13 # Write out pointer to table
ret
StorePointer:
add r13, 4 # Increment IP
call Get_table_target # Get address of pointer
mov rax, [rax] # Get pointer
sub rax, r13 # target - ip
mov rdx, 4 # set the size of chars we want
call print_chars
ret
Done:
push rbx # allocate stack
mov rcx, rdi # arg1 = fin
call [rcx+16] # fin->close()
mov rcx, rbx # arg1 = fout
call [rcx+16] # fout->close()
abort: # used for debugging only
mov rsp, rbp # restore stack
ret # return to UEFI
.data
# 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
table:
.long 0, 0
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