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Bootloader: Implement better memset and memcpy for 32 bit addresses

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Bananymous
2024-04-20 17:57:16 +03:00
parent 0e405755ad
commit 9ac3f48fcb
6 changed files with 138 additions and 43 deletions
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22
bootloader/bios/elf.S
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@@ -113,24 +113,6 @@ elf_validate_file_header:
movw $elf_validate_file_header_not_executable_msg, %si
jmp print_and_halt
# sets memory to zero
# edi: start address
# ecx: byte count
# on return
# edi: start address + byte count
# ecx: 0
elf_memset_zero:
test %ecx, %ecx
jz .elf_memset_zero_done
.elf_memset_zero_loop:
movb $0, (%edi)
incl %edi
decl %ecx
jnz .elf_memset_zero_loop
.elf_memset_zero_done:
ret
# reads memory specified by 32 bit elf_program_header to memory
elf_read_program_header32_to_memory:
pushal
@@ -144,7 +126,7 @@ elf_read_program_header32_to_memory:
addl %ebx, %edi
movl (elf_program_header + p32_memsz), %ecx
subl %ebx, %ecx
call elf_memset_zero
xorb %al, %al; call memset32
# read file specified in program header to memory
movl (elf_program_header + p32_offset), %eax
@@ -171,7 +153,7 @@ elf_read_program_header64_to_memory:
addl %ebx, %edi
movl (elf_program_header + p64_memsz), %ecx
subl %ebx, %ecx
call elf_memset_zero
xorb %al, %al; call memset32
# read file specified in program header to memory
movl (elf_program_header + p64_offset), %eax