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bc7842e301
qvmcall64 has its own custom calling convention due to pushing all non-volatile registers to the stack. The game uses set/longjmp which on Windows uses "RtlUnwindEx" to unwind the callstack. qvmcall64 cannot be unwound by default due to the custom calling convention. To allow unwinding, we need to add custom SEH unwind data to the function.
85 lines
2.7 KiB
NASM
85 lines
2.7 KiB
NASM
; ===========================================================================
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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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.code
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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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;
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; This call-stub has its own custom calling convention due to pushing all non-volatile registers
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; to the stack. The game uses set/longjmp which on Windows uses "RtlUnwindEx" to unwind the callstack.
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; This function cannot be unwound by default due to the custom calling convention.
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; To allow unwinding, we need to add custom SEH unwind data to the function.
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qvmcall64 PROC FRAME
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push r12 ; push all non-volatile registers to stack
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.pushreg r12
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push r13
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.pushreg r13
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push r14
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.pushreg r14
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push r15
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.pushreg r15
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push rdi
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.pushreg rdi
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push rsi
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.pushreg rsi
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push rbx
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.pushreg rbx
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push rbp
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.pushreg rbp
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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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.pushreg rcx
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.endprolog ; custom unwind data ends here
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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 rbp ; restore all non-volatile registers after the call
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pop rbx
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pop rsi
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pop rdi
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pop r15
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pop r14
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pop r13
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pop r12
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ret
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qvmcall64 ENDP
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end
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