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hex0.S: use ret rather than calling system->boot->exit()

This commit is contained in:
Andrius Štikonas 2022-07-15 23:09:35 +01:00
parent 9895b0da06
commit 3e95bb7d48
1 changed files with 8 additions and 11 deletions
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19
amd64/Development/hex0.S
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@ -3,7 +3,7 @@
#
# SPDX-License-Identifier: GPL-3.0-or-later
# Usage hex0 file.hex0 file
# Usage: hex0 file.hex0 file
# Does not validate the arguments or check for success
# Calling convention:
@ -210,26 +210,23 @@ ascii_other:
ret
terminate:
sub rsp, 32 # allocate stack
sub rsp, 8 # allocate stack
mov rcx, [fin] # arg1 = fin
call [rcx+16] # fin->close()
mov rcx, [fout] # arg1 = fout
call [rcx+16] # fout->close()
mov rcx, [ImageHandle] # arg1 = ImageHandle
mov rdx, 0 # exit code
mov rax, [SystemBoot]
call [rax+216] # system->boot->exit(ImageHandle, 0)
add rsp, 32 # deallocate stack
add rsp, 16 # deallocate stack
ret
read_byte:
sub rsp, 32 # allocate stack
sub rsp, 24 # allocate stack
mov qword ptr [size], 1 # size = 1
mov rcx, [fin] # arg1 = fin
lea rdx, [size] # arg2 = &size
lea r8, [input] # arg3 = &input
call [rcx+32] # fin->read()
add rsp, 32 # deallocate stack
add rsp, 24 # deallocate stack
# If the file ended (0 bytes read) terminate
cmp qword ptr [size], 0 # if size == 0
@ -239,13 +236,13 @@ read_byte:
ret # return
write_byte:
sub rsp, 32 # allocate stack
sub rsp, 24 # allocate stack
mov qword ptr [size], 1 # size = 1
mov rcx, [fout] # arg1 = fout
lea rdx, [size] # arg2 = &size
lea r8, [output] # arg3 = &output
call [rcx+40] # fout->write()
add rsp, 32 # deallocate stack
add rsp, 24 # deallocate stack
ret # return
.data