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Fix JIT compiler code execution on NX-protected win32 OS

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This commit is contained in:
Thilo Schulz 2006-05-15 15:57:02 +00:00
parent 27df5fca31
commit a08a539c10
1 changed files with 18 additions and 0 deletions
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18
code/qcommon/vm_x86.c
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@ -22,6 +22,9 @@ Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
// vm_x86.c -- load time compiler and execution environment for x86
#include "vm_local.h"
#ifdef _WIN32
#include <windows.h>
#endif
#ifdef __FreeBSD__ // rb0101023
#include <sys/types.h>
@ -1081,6 +1084,11 @@ void VM_Compile( vm_t *vm, vmHeader_t *header ) {
vm->codeBase = mmap(NULL, compiledOfs, PROT_WRITE, MAP_SHARED|MAP_ANONYMOUS, -1, 0);
if(vm->codeBase == (void*)-1)
Com_Error(ERR_DROP, "VM_CompileX86: can't mmap memory");
#elif _WIN32
// allocate memory with EXECUTE permissions under windows.
vm->codeBase = VirtualAlloc(NULL, compiledOfs, MEM_COMMIT, PAGE_EXECUTE_READWRITE);
if(!vm->codeBase)
Com_Error(ERR_DROP, "VM_CompileX86: VirtualAlloc failed");
#else
vm->codeBase = malloc(compiledOfs);
#endif
@ -1090,6 +1098,14 @@ void VM_Compile( vm_t *vm, vmHeader_t *header ) {
#ifdef VM_X86_MMAP
if(mprotect(vm->codeBase, compiledOfs, PROT_READ|PROT_EXEC))
Com_Error(ERR_DROP, "VM_CompileX86: mprotect failed");
#elif _WIN32
{
DWORD oldProtect = 0;
// remove write permissions.
if(!VirtualProtect(vm->codeBase, compiledOfs, PAGE_EXECUTE_READ, &oldProtect))
Com_Error(ERR_DROP, "VM_CompileX86: VirtualProtect failed");
}
#endif
Z_Free( buf );
@ -1108,6 +1124,8 @@ void VM_Destroy_Compiled(vm_t* self)
{
#ifdef VM_X86_MMAP
munmap(self->codeBase, self->codeLength);
#elif _WIN32
VirtualFree(self->codeBase, self->codeLength, MEM_RELEASE);
#else
free(self->codeBase);
#endif