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Add catm.S prototype.

This commit is contained in:
Andrius Štikonas 2022-08-14 17:25:28 +01:00
parent 7b08537914
commit ba541383ad
17 changed files with 246 additions and 16 deletions
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5
amd64/Development/Makefile
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@ -2,14 +2,17 @@
#
# SPDX-License-Identifier: GPL-3.0-or-later
targets = kaem-minimal hex0 hex1 hex2 catm
cc = clang
cflags = -ffreestanding -MMD -mno-red-zone -std=c11 -target x86_64-unknown-windows -masm=intel
ld = lld-link
lflags = -subsystem:efi_application -nodefaultlib -dll
build = build
targets2 = $(addsuffix .efi, $(addprefix $(build)/, $(targets)))
all: $(build)/hex0.efi $(build)/kaem-minimal.efi $(build)/hex1.efi $(build)/hex2.efi
all: $(targets2)
$(build)/%.o : %.S
mkdir -p $(build)

227
amd64/Development/catm.S Normal file
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@ -0,0 +1,227 @@
# SPDX-FileCopyrightText: 2022 Andrius Štikonas <andrius@stikonas.eu>
# SPDX-FileCopyrightText: 2019 Jeremiah Orians
#
# 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
# 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, r15 # arg4 = image_handle
mov rcx, r15 # arg1 = image_handle
sub rsp, 32 # allocate shadow stack space for UEFI function
call [r14+280] # system->boot->open_protocol(image_handle, &guid, &image, image_handle, 0, EFI_OPEN_PROTOCOL_BY_HANDLE_PROTOCOL)
mov rax, [rsp+64] # get image
mov rdi, rax # save image
# 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, [rdi+24] # arg1 = root_device = image->device
sub rsp, 32 # allocate shadow stack space for UEFI function
call [r14+280] # system->boot->open_protocol(root_device, &guid, &rootfs, image_handle, 0, EFI_OPEN_PROTOCOL_BY_HANDLE_PROTOCOL)
mov rcx, [rsp+64] # get rootfs
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 rax # get rootdir
mov [rip+rootdir], rax # save rootdir
# Push command line arguments onto stack
mov rbx, [rdi+56] # options = image->load_options
mov rdx, rbx # save beginning of load_options
add rbx, [rdi+48] # go to the end of load_options
push 0 # Save end of arguments (NULL) onto stack
jmp loop_options_1
loop_options:
push rbx # push another argument onto stack
loop_options_1:
cmp rbx, rdx # Check if we are done
je loop_options_done # We are done
sub rbx, 2 # --options
mov al, [rbx] # *options
cmp al, 0x20 # if *options != ' '
jne loop_options_1 # then continue looping
mov BYTE PTR [rbx], 0 # zero it
add rbx, 2 # ++options
jmp loop_options # next argument
loop_options_done:
pop rdx # get output file
# Open file for writing
mov r8, rdx
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 rcx, [rip+rootdir] # arg1 = rootdir
sub rsp, 32 # allocate shadow stack space for UEFI function
call [rcx+8] # rootdir->open()
add rsp, 40 # deallocate stack
pop r15 # get fout
mov rdx, 0x100000 # Allocate 1MiB
call allocate_pool # Get memory pool
mov rbx, rax # Save it
core:
pop r8 # Get the actual input name
cmp r8, 0 # Check for null string
je done # We are done if null string
call open_file # Open file as read only
test eax, eax # check if successfully opened
jne core # Else go to another file
mov r13, rsi # Protect fin
keep:
mov rdx, 0x100000 # set the size of chars we want
call read # read it
push rax # Protect the number of bytes read
mov rdx, rax # number of bytes to write
call write # write them
pop rax # Get bytes read
cmp rax, 0x100000 # Check if buffer was fully used
je keep # Keep looping if it was full
mov rcx, r13 # fin
call close_file # close file
jmp core # Move to next file
done:
mov rcx, r15 # Get output file
call close_file # close it
mov rcx, rbx # Get buffer
call free_pool # release it
mov rax, 0 # Exit code 0
mov rsp, rbp # restore stack pointer
ret # return to UEFI
# r8: input file name
# returns input file handle in rsi, status in rax
open_file:
# 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 rcx, [rip+rootdir] # arg1 = rootdir
sub rsp, 32 # allocate shadow stack space for UEFI function
call [rcx+8] # rootdir->open()
add rsp, 40 # allocate shadow stack space for UEFI function
pop rsi # get fin
ret
# 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
# 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
# rcx: memory pool
# r14: system->boot
free_pool:
push rax # allocate shadow stack space for UEFI function
call [r14+72] # system->boot->free_pool(scratch)
pop rax # deallocate stack
ret
# rdx: number of bytes to read
# rbx: buffer
# r13: input file handle
# returns number of bytes read in rax
read:
mov rcx, r13 # arg1 = fin
push rdx # set size
mov rdx, rsp # arg2 = &size
mov r8, rbx # arg3 = buffer
sub rsp, 24 # allocate shadow stack space for UEFI
call [rcx+32] # fin->read()
add rsp, 24 # deallocate stack
pop rax # save size to rax
ret
# rdx: number of bytes to write
# rbx: buffer
# r14: output file handle
# returns number of bytes written in rax
write:
mov rcx, r15 # arg1 = fout
push rdx # set size
mov rdx, rsp # arg2 = &size
mov r8, rbx # arg3 = buffer
sub rsp, 24 # allocate shadow stack space for UEFI
call [rcx+40] # fin->write()
add rsp, 24 # deallocate stack
pop rax # save size to rax
ret
.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
rootdir:
.long 0, 0

2
amd64/Development/hex0.M1
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@ -152,7 +152,7 @@ DEFINE TEST_ESI_ESI 85F6
CALL_RCX_Immediate8 !8 # rootfs->open_volume(rootfs, &rootdir)
POP_RAX # deallocate stack
POP_RAX # deallocate stack
POP_R14 # save &rootdir
POP_R14 # save rootdir
# Open file for writing
PUSH_RDX # allocate stack for fout

2
amd64/Development/hex0.S
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@ -92,7 +92,7 @@ loop_options2: # Skip argv[1]
call [rcx+8] # rootfs->open_volume(rootfs, &rootdir)
pop rax # deallocate stack
pop rax # deallocate stack
pop r14 # save &rootdir
pop r14 # save rootdir
# Open file for writing
push rdx # allocate stack for fout

2
amd64/Development/hex0.hex2
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@ -90,7 +90,7 @@
FF51 08 ; CALL_RCX_Immediate8 !8 # rootfs->open_volume(rootfs, &rootdir)
58 ; POP_RAX # deallocate stack
58 ; POP_RAX # deallocate stack
415E ; POP_R14 # save &rootdir
415E ; POP_R14 # save rootdir
# Open file for writing
52 ; PUSH_RDX # allocate stack for fout

2
amd64/Development/hex1.M1
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@ -163,7 +163,7 @@ DEFINE TEST_ESI_ESI 85F6
CALL_RCX_Immediate8 !8 # rootfs->open_volume(rootfs, &rootdir)
POP_RAX # deallocate stack
POP_RAX # deallocate stack
POP_R14 # save &rootdir
POP_R14 # save rootdir
# Open file for reading
PUSH_RDX # allocate stack for fin

2
amd64/Development/hex1.S
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@ -89,7 +89,7 @@ loop_options2: # Skip argv[1]
call [rcx+8] # rootfs->open_volume(rootfs, &rootdir)
pop rax # deallocate stack
pop rax # deallocate stack
pop r14 # save &rootdir
pop r14 # save rootdir
# Open file for reading
push rdx # allocate stack for fin

2
amd64/Development/hex1.hex2
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@ -87,7 +87,7 @@
FF51 08 ; CALL_RCX_Immediate8 !8 # rootfs->open_volume(rootfs, &rootdir)
58 ; POP_RAX # deallocate stack
58 ; POP_RAX # deallocate stack
415E ; POP_R14 # save &rootdir
415E ; POP_R14 # save rootdir
# Open file for reading
52 ; PUSH_RDX # allocate stack for fin

2
amd64/Development/hex2.M1
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@ -205,7 +205,7 @@ DEFINE ZERO_EXTEND_BL 480FB6DB
CALL_RCX_Immediate8 !8 # rootfs->open_volume(rootfs, &rootdir)
POP_RAX # deallocate stack
POP_RAX # deallocate stack
POP_RBX # save &rootdir
POP_RBX # save rootdir
# Open file for reading
PUSH_RDX # allocate stack for fin

2
amd64/Development/hex2.S
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@ -94,7 +94,7 @@ loop_options2: # Skip argv[1]
call [rcx+8] # rootfs->open_volume(rootfs, &rootdir)
pop rax # deallocate stack
pop rax # deallocate stack
pop rbx # save &rootdir
pop rbx # save rootdir
# Open file for reading
push rdx # allocate stack for fin

2
amd64/Development/kaem-minimal.M1
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@ -184,7 +184,7 @@ DEFINE XOR_R15_R15 4D31FF
CALL_RCX_Immediate8 !8 # rootfs->open_volume(rootfs, &rootdir)
POP_RAX # deallocate stack
POP_RAX # deallocate stack
POP_R13 # save &rootdir
POP_R13 # save rootdir
# Open file for reading
PUSH_RDX # allocate stack for fin

2
amd64/Development/kaem-minimal.S
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@ -84,7 +84,7 @@ root_fs:
call [rcx+8] # rootfs->open_volume(rootfs, &rootdir)
pop rax # deallocate stack
pop rax # deallocate stack
pop r13 # save &rootdir
pop r13 # save rootdir
# Open file for reading
push rdx # allocate stack for fin

2
amd64/Development/kaem-minimal.hex2
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@ -81,7 +81,7 @@
FF51 08 ; CALL_RCX_Immediate8 !8 # rootfs->open_volume(rootfs, &rootdir)
58 ; POP_RAX # deallocate stack
58 ; POP_RAX # deallocate stack
415D ; POP_R13 # save &rootdir
415D ; POP_R13 # save rootdir
# Open file for reading
52 ; PUSH_RDX # allocate stack for fin

2
amd64/hex0.hex0
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@ -220,7 +220,7 @@ A3 01 00 00 ; SizeOfRawData
FF51 08 ; CALL_RCX_Immediate8 !8 # rootfs->open_volume(rootfs, &rootdir)
58 ; POP_RAX # deallocate stack
58 ; POP_RAX # deallocate stack
415E ; POP_R14 # save &rootdir
415E ; POP_R14 # save rootdir
# Open file for writing
52 ; PUSH_RDX # allocate stack for fout

2
amd64/hex1.hex0
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@ -215,7 +215,7 @@ D4 03 00 00 ; SizeOfRawData
FF51 08 ; CALL_RCX_Immediate8 !8 # rootfs->open_volume(rootfs, &rootdir)
58 ; POP_RAX # deallocate stack
58 ; POP_RAX # deallocate stack
415E ; POP_R14 # save &rootdir
415E ; POP_R14 # save rootdir
# Open file for reading
52 ; PUSH_RDX # allocate stack for fin

2
amd64/hex2.hex1
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@ -222,7 +222,7 @@ F0 00 # SizeOfOptionalHeader
FF51 08 ; CALL_RCX_Immediate8 !8 # rootfs->open_volume(rootfs, &rootdir)
58 ; POP_RAX # deallocate stack
58 ; POP_RAX # deallocate stack
5B ; POP_RBX # save &rootdir
5B ; POP_RBX # save rootdir
# Open file for reading
52 ; PUSH_RDX # allocate stack for fin

2
amd64/kaem-minimal.hex0
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@ -212,7 +212,7 @@ F7 03 00 00 ; SizeOfRawData
FF51 08 ; CALL_RCX_Immediate8 !8 # rootfs->open_volume(rootfs, &rootdir)
58 ; POP_RAX # deallocate stack
58 ; POP_RAX # deallocate stack
415D ; POP_R13 # save &rootdir
415D ; POP_R13 # save rootdir
# Open file for reading
52 ; PUSH_RDX # allocate stack for fin