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# Copyright 2022-2023 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_syscall
zap_syscall:
# System calls on AMD64 use the following registers:
# rax : System call identifier
# rdi : First parameter
# rsi : Second parameter
# rdx : Third parameter
# r10 : Fourth parameter
# r8 : Fifth parameter
# r9 : Sixth parameter
# eax : Return value
# No registers to save.
movq %rdi,%rax # Move the first parameter (the identifier) to rax.
movq %rsi,%rdi # Move parameters into their designated registers.
movq %rdx,%rsi
movq %rcx,%rdx
movq %r8,%r10 # System calls use r10 instead of rcx.
movq %r9,%r8
movq 0x8(%rsp),%r9 # Extract the sixth argument from the stack.
syscall # Slime incident
# No need to move the return value.
ret
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