Initial port of cc_amd64.S to UEFI.
It can build some simple stuff but fails to build M2-Planet due to stack overflow. UEFI guarantees only 128 KiB of stack space but we need about 2MiB.
This commit is contained in:
parent
89771b3fc7
commit
b46ba0d078
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@ -1060,7 +1060,7 @@ DEFINE xor_r13,r13 4D31ED
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# fputc function
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# receives CHAR in RAX and FILE* in R14
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# receives CHAR in RAX
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# writes char and returns
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:fputc
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push_rcx # Protect RCX
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@ -1163,9 +1163,6 @@ DEFINE xor_r13,r13 4D31ED
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:rootdir
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%0 %0
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:SystemBoot
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%0 %0
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:image_handle
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%0 %0
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@ -925,7 +925,7 @@ File_Print_Done:
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# fputc function
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# receives CHAR in RAX and FILE* in R14
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# receives CHAR in RAX
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# writes char and returns
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fputc:
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push rcx # Protect RCX
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@ -1026,9 +1026,6 @@ fout:
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rootdir:
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.long 0, 0
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SystemBoot:
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.long 0, 0
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image_handle:
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.long 0, 0
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@ -2,7 +2,7 @@
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#
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# SPDX-License-Identifier: GPL-3.0-or-later
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targets = kaem-optional hex0 hex1 hex2 catm M0
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targets = kaem-optional hex0 hex1 hex2 catm M0 cc_amd64
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cc = clang
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cflags = -ffreestanding -MMD -mno-red-zone -target x86_64-unknown-windows
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@ -22,8 +22,7 @@
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# Register usage:
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# RAX, RSI, RDI => Temps
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# R13 => MALLOC
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# R14 => Output_file
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# R15 => Input_file
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# R15 => stderr flag
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# Struct TYPE format: (size 56)
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# NEXT => 0
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@ -41,34 +40,98 @@
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# TYPE => 24
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# ARGS/DEPTH => 32
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# Where the ELF Header is going to hit
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# Simply jump to _start
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# Our main function
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# efi_main(void *image_handle, struct efi_system_table *system)
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_start:
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pop rax # Get the number of arguments
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pop rdi # Get the program name
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pop rdi # Get the actual input name
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mov rsi, 0 # prepare read_only
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mov rax, 2 # the syscall number for open()
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syscall # Now open that damn file
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mov r15, rax # Preserve the file pointer we were given
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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 [rip+system], rdx # save system
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mov r14, [rdx+96] # system->boot
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pop rdi # Get the actual output name
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mov rsi, 577 # Prepare file as O_WRONLY|O_CREAT|O_TRUNC
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mov rdx, 384 # Prepare file as RW for owner only (600 in octal)
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mov rax, 2 # the syscall number for open()
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syscall # Now open that damn file
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cmp rax, 0 # Check for missing output
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jg _start_out # Have real input
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mov rax, 1 # Use stdout
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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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_start_out:
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mov r14, rax # Preserve the file pointer we were given
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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], rcx # 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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mov rax, 12 # the Syscall # for SYS_BRK
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mov rdi, 0 # Get current brk
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syscall # Let the kernel do the work
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mov r13, rax # Set our malloc pointer
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# Get root directory
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lea rdx, [rip+rootdir] # arg2 = &rootdir
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sub rsp, 16 # allocate shadow stack space for UEFI function
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call [rcx+8] # rootfs->open_volume(rootfs, &rootdir)
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add rsp, 16 # 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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mov r9, 1 # 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 64 MiB of memory
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mov rdx, 0x4000000 # allocate 64 MiB of memory for malloc pool
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call allocate_pool # allocate memory
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mov [rip+malloc_pointer], rax # save malloc pointer
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mov [rip+malloc_pool], rax # save the beginning of malloc pool
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# Zero allocated memory buffer
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add rax, 0x4000000 # end of malloc area
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zero_loop:
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dec rax # next byte
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mov BYTE PTR [rax], 0 # zero it
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cmp rax, [rip+malloc_pointer] # if we are not done yet
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jne zero_loop # then continue looping
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mov r15, 0 # Not writing to stderr yet
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call fix_types # Resolve relative addresses in types struct to absolute
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mov rax, 0 # HEAD = NULL
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@ -94,11 +157,44 @@ _start_out:
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lea rax, [rip+header_string5] # Our final header
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call File_Print # Print it
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Done:
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# program completed Successfully
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mov rdi, 0 # All is well
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mov rax, 0x3c # put the exit syscall number in eax
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syscall # Call it a good day
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mov rax, 0 # Set exit code 0
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Done_1:
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# Free pool
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push rax # save exit code
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mov rcx, [rip+malloc_pool] # arg1 = malloc_pool
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call free_pool # system->boot->free_pool(malloc_pool)
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mov rcx, [rip+fout] # get fout
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call close_file # close fout
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failed_output:
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mov rcx, [rip+fin] # get fin
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call close_file # close fin
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failed_input:
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mov rcx, [rip+rootdir] # get rootdir
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call close_file # close rootdir
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mov r8, [rip+image_handle] # arg3 = image_handle
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lea rdx, [rip+SIMPLE_FS_PROTOCOL] # guid = &SIMPLE_FS_PROTOCOL
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mov rcx, [rip+root_device] # arg1 = root_device
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call close_protocol # close protocol
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mov r8, [rip+image_handle] # arg3 = image_handle
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lea rdx, [rip+LOADED_IMAGE_PROTOCOL] # guid = &LOADED_IMAGE_PROTOCOL
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mov rcx, r8 # arg1 = image_handle
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call close_protocol # close protocol
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pop rax # restore exit code
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abort: # used for debugging only
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mov rsp, rbp # restore stack
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ret # return to UEFI
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header_string1: .asciz "\n# Core program\n"
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header_string2: .asciz "\n:ELF_data\n"
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@ -306,20 +402,15 @@ get_token_abort:
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ret
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# Malloc isn't actually required if the program being built fits in the initial memory
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# However, it doesn't take much to add it.
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# Requires R13 to be initialized and RAX to have the number of desired bytes
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# Malloc isn't actually reserving memory here.
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# It just updates the pointer in our already reserved storage pool.
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malloc:
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mov rdi, r13 # Using the current pointer
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add rdi, rax # Request the number of desired bytes
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mov rax, 12 # the Syscall # for SYS_BRK
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push rcx # Protect rcx
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push r11 # Protect r11
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syscall # call the Kernel
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pop r11 # Restore r11
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pop rcx # Restore rcx
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mov rax, r13 # Return pointer
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mov r13, rdi # Update pointer
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push rbx # Protect RBX
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mov rbx, [rip+malloc_pointer] # Get malloc pointer
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xchg rax, rbx # Put it in place
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add rbx, rax # Request number of desired bytes
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mov [rip+malloc_pointer], rbx # Save malloc_pointer
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pop rbx
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ret
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@ -533,28 +624,32 @@ fixup_label_loop:
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# fgetc function
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# Receives FILE* in R15
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# Returns -4 (EOF) or char in RAX
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fgetc:
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mov rax, -4 # Put EOF in rax
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push rax # Assume bad (If nothing read, value will remain EOF)
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lea rsi, [rsp] # Get stack address
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mov rdi, r15 # Where are we reading from
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mov rax, 0 # the syscall number for read
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push rdx # Protect RDX
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mov rdx, 1 # set the size of chars we want
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push rcx # Protect RCX
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push r11 # Protect R11
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syscall # call the Kernel
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pop r11 # Restore R11
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pop rcx # Restore RCX
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push rdx # Protect RDX
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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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sub rsp, 24 # allocate shadow stack space for UEFI function
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call [rcx+32] # fin->read()
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add rsp, 24 # 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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# If the file ended (0 bytes read) return EOF
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cmp rsi, 0 # if size == 0
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jne fgetc_1
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mov rax, -4 # Put EOF in rax
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fgetc_1:
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pop rdx # Restore RDX
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pop rax # Get either char or EOF
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cmp rax, -4 # Check for EOF
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je fgetc_done # Return as is
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movzx rax, al # Make it useful
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fgetc_done:
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ret
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pop rcx # Restore RCX
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ret # return
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# Reverse_List function
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@ -630,23 +725,46 @@ File_Print_Done:
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# fputc function
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# receives CHAR in RAX and FILE* in R14
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# receives CHAR in RAX
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# writes char and returns
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fputc:
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push rax # We are writing rax
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lea rsi, [rsp] # Get stack address
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mov rdi, r14 # Write to target file
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mov rax, 1 # the syscall number for write
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push rdx # Protect RDX
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mov rdx, 1 # set the size of chars we want
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push rcx # Protect RCX
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push r11 # Protect R11
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syscall # call the Kernel
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pop r11 # Restore R11
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pop rcx # Restore RCX
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push rdx # Protect RDX
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cmp r15, 2 # Check if printing to system error
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jne fputc_file # Else print to file
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# Print to stderr
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cmp rax, '\n' # If we have LF, we need to append CR
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pushf # Protect condition
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mov rcx, [rip+system] # get system
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mov rcx, [rcx+64] # system->out (system->err doesn't print anything for some reason)
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mov [rip+WCHAR], al # Convert to WCHAR
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lea rdx, [rip+WCHAR] # arg3 = *WCHAR
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sub rsp, 16 # allocate shadow stack space for UEFI function
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call [rcx+8] # system->err->output_string(system->err, WCHAR*)
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add rsp, 16 # deallocate stack
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popf # Restore condition
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jne fputc_done # We are done if not LF
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mov rax, '\r' # Carriage return
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call fputc # Print it
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jmp fputc_done # We are done
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fputc_file:
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mov rcx, [rip+fout] # arg1 = fout
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push 1 # 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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sub rsp, 24 # 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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fputc_done:
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pop rdx # Restore RDX
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pop rax # Restore stack
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ret
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pop rcx # Restore RCX
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ret # return
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# program function
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@ -1950,7 +2068,7 @@ process_break_cleaned:
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process_break_bad:
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# Breaking badly
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mov r14, 2 # write to standard error
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mov r15, 2 # write to standard error
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# call line_error # Write useful debug info
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mov rax, rcx # put S in the right place
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call File_Print # print it
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@ -2731,7 +2849,7 @@ primary_expr_variable_global:
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jmp primary_expr_variable_done # Be done
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primary_expr_variable_error:
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mov r14, 2 # write to standard error
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mov r15, 2 # write to standard error
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# call line_error # Write useful debug info
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mov rax, rcx # put S in the right place
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call File_Print # print it
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@ -3186,7 +3304,7 @@ primary_expr_char_string_1: .byte 10, 0
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# Complains about the bad input
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primary_expr_failure:
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# call line_error # Get line of issue
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mov r14, 2 # write to standard error
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mov r15, 2 # write to standard error
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lea rax, [rip+primary_expr_failure_string_0] # Using "Received "
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call File_Print # Print it
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@ -3339,7 +3457,7 @@ require_match:
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# Deal with bad times
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# call line_error # Tell user what went wrong
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mov r14, 2 # write to standard error
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mov r15, 2 # write to standard error
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mov rax, rcx # using our message
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call File_Print # Print it
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jmp Exit_Failure # Abort HARD
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@ -3468,7 +3586,7 @@ escape_lookup:
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# Looks like we have no clue what we are doing
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# Aborting hard
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mov r14, 2 # write to standard error
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mov r15, 2 # write to standard error
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lea rax, [rip+escape_lookup_string_0] # Using "Unknown escape received: "
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call File_Print # Print it
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mov rax, rcx # Using C
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@ -3519,7 +3637,7 @@ char2hex:
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char2hex_fail:
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# Time to fail hard
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mov r14, 2 # write to standard error
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mov r15, 2 # write to standard error
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lea rax, [rip+char2hex_string_0] # Using "Tried to print non-hex number\n"
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call File_Print # Print it
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jmp Exit_Failure # Abort Hard
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@ -3814,7 +3932,7 @@ type_name_native:
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jne type_name_common # We need to abort hard
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# Aborting hard
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mov r14, 2 # write to standard error
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mov r15, 2 # write to standard error
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lea rax, [rip+type_name_string_0] # Print header
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call File_Print # Print it
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@ -4031,7 +4149,7 @@ lookup_member_iter:
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ret
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lookup_member_fail:
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mov r14, 2 # write to standard error
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mov r15, 2 # write to standard error
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lea rax, [rip+lookup_member_string_0] # Using "ERROR in lookup_member "
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call File_Print # print it
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@ -4410,9 +4528,62 @@ numerate_string_done:
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# And aborts hard
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# Does NOT return
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Exit_Failure:
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mov rdi, 1 # All is wrong
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mov rax, 0x3c # put the exit syscall number in eax
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syscall # Call it a bad day
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mov eax, 1 # All is wrong
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jmp Done_1 # Exit gracefully
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# rcx: file handle
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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
|
||||
|
||||
# rcx: memory pool
|
||||
# r14: system->boot
|
||||
free_pool:
|
||||
push rax # allocate shadow stack space for UEFI function
|
||||
call [r14+72] # system->boot->free_pool(pool)
|
||||
pop rax # deallocate stack
|
||||
ret
|
||||
|
||||
# debug_list function
|
||||
# Receives struct token_list* in RAX
|
||||
|
|
@ -4420,7 +4591,7 @@ Exit_Failure:
|
|||
# Does NOT return
|
||||
debug_list:
|
||||
mov r12, rax # Protect the list pointer
|
||||
mov r14, 2 # write to standard error
|
||||
mov r15, 2 # write to standard error
|
||||
|
||||
debug_list_iter:
|
||||
# Header
|
||||
|
|
@ -4483,9 +4654,8 @@ debug_list_null:
|
|||
cmp r12, 0 # Check if NULL
|
||||
jne debug_list_iter # iterate otherwise
|
||||
|
||||
mov rdi, 666 # All is HELL
|
||||
mov rax, 0x3c # put the exit syscall number in eax
|
||||
syscall # Call it a bad day
|
||||
mov eax, 666 # All is HELL
|
||||
jmp abort # Call it a bad day
|
||||
|
||||
.data
|
||||
|
||||
|
|
@ -4664,3 +4834,44 @@ globals_list: .quad 0
|
|||
output_list: .quad 0
|
||||
string_index: .quad 0
|
||||
strings_list: .quad 0
|
||||
|
||||
|
||||
# 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
|
||||
|
||||
malloc_pool:
|
||||
.quad 0
|
||||
|
||||
malloc_pointer:
|
||||
.quad 0
|
||||
|
||||
fin:
|
||||
.quad 0
|
||||
|
||||
fout:
|
||||
.quad 0
|
||||
|
||||
rootdir:
|
||||
.quad 0
|
||||
|
||||
system:
|
||||
.quad 0
|
||||
|
||||
image_handle:
|
||||
.quad 0
|
||||
|
||||
root_device:
|
||||
.quad 0
|
||||
|
||||
WCHAR:
|
||||
.long 0 # WCHAR with null terminator
|
||||
|
|
|
|||
|
|
@ -921,7 +921,7 @@
|
|||
|
||||
|
||||
# fputc function
|
||||
# receives CHAR in RAX and FILE* in R14
|
||||
# receives CHAR in RAX
|
||||
# writes char and returns
|
||||
:fputc
|
||||
51 ; push_rcx # Protect RCX
|
||||
|
|
@ -1022,9 +1022,6 @@
|
|||
:rootdir
|
||||
00000000 00000000
|
||||
|
||||
:SystemBoot
|
||||
00000000 00000000
|
||||
|
||||
:image_handle
|
||||
00000000 00000000
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue