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# Copyright 2022 Gabriel Jensen.
# This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0.
# If a copy of the MPL was not distributed with this file, You can obtain one at https://mozilla.org/MPL/2.0/.
.globl zap_memfill
zap_memfill:
# Address of the current element:
#define addr %rdi
# Address of the element after the last element:
#define afterbuf %rsi
# Byte value:
#define val %dl
addq addr,afterbuf # afterbuf += addr // afterbuf contains the number of bytes
# Iterate over buffer:
.loop:
# Check if we have reached the final element:
cmpq addr,afterbuf # if (addr == afterbuf)
je .done # goto done
# Set the value of the current element:
movb val,(addr) # *addr = val
# Continue to next element:
incq addr # ++addr
jmp .loop # goto loop
# Finish:
.done:
ret # return
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