mirror of
https://github.com/DrBeef/ioq3quest.git
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77 lines
2.5 KiB
NASM
77 lines
2.5 KiB
NASM
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; ===========================================================================
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; Copyright (C) 2011 Thilo Schulz <thilo@tjps.eu>
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;
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; This file is part of Quake III Arena source code.
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;
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; Quake III Arena source code is free software; you can redistribute it
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; and/or modify it under the terms of the GNU General Public License as
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; published by the Free Software Foundation; either version 2 of the License,
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; or (at your option) any later version.
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;
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; Quake III Arena source code is distributed in the hope that it will be
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; useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
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; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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; GNU General Public License for more details.
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;
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; You should have received a copy of the GNU General Public License
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; along with Quake III Arena source code; if not, write to the Free Software
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; Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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; ===========================================================================
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; Call wrapper for vm_x86 when built with MSVC in 64 bit mode,
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; since MSVC does not support inline x64 assembler code anymore.
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;
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; assumes __fastcall calling convention
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DoSyscall PROTO
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.code
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; Call to static void DoSyscall(int syscallNum, int programStack, int *opStackBase, uint8_t opStackOfs, intptr_t arg)
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qsyscall64 PROC
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sub rsp, 28h ; after this esp will be aligned to 16 byte boundary
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mov qword ptr [rsp + 20h], rcx ; 5th parameter "arg" is passed on stack
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mov r9b, bl ; opStackOfs
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mov r8, rdi ; opStackBase
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mov edx, esi ; programStack
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mov ecx, eax ; syscallNum
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mov rax, DoSyscall ; store call address of DoSyscall in rax
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call rax
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add rsp, 28h
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ret
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qsyscall64 ENDP
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; Call to compiled code after setting up the register environment for the VM
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; prototype:
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; uint8_t qvmcall64(int *programStack, int *opStack, intptr_t *instructionPointers, byte *dataBase);
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qvmcall64 PROC
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push rsi ; push non-volatile registers to stack
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push rdi
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push rbx
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; need to save pointer in rcx so we can write back the programData value to caller
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push rcx
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; registers r8 and r9 have correct value already thanx to __fastcall
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xor rbx, rbx ; opStackOfs starts out being 0
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mov rdi, rdx ; opStack
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mov esi, dword ptr [rcx] ; programStack
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call qword ptr [r8] ; instructionPointers[0] is also the entry point
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pop rcx
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mov dword ptr [rcx], esi ; write back the programStack value
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mov al, bl ; return opStack offset
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pop rbx
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pop rdi
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pop rsi
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ret
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qvmcall64 ENDP
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end
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