mirror of
https://github.com/ValveSoftware/Proton.git
synced 2024-12-30 16:45:36 +03:00
80 lines
1.8 KiB
C
80 lines
1.8 KiB
C
/* asm thunks for the flat (FnTable) API */
|
|
|
|
#ifdef __i386__
|
|
|
|
#include "cxx.h"
|
|
#include "pshpack1.h"
|
|
struct thunk
|
|
{
|
|
BYTE mov_ecx;
|
|
void *this;
|
|
BYTE mov_edx;
|
|
void *proc;
|
|
BYTE jmp;
|
|
LONG call_flat;
|
|
BYTE nop;
|
|
};
|
|
#include "poppack.h"
|
|
|
|
extern void call_flat_method(void);
|
|
|
|
static inline void init_thunk( struct thunk *thunk, void *this, void *proc,
|
|
int param_count, BOOL has_floats, BOOL is_4th_float )
|
|
{
|
|
thunk->mov_ecx = 0xb9;
|
|
thunk->this = this;
|
|
thunk->mov_edx = 0xba;
|
|
thunk->proc = proc;
|
|
thunk->jmp = 0xe9;
|
|
#ifdef __ASM_USE_THISCALL_WRAPPER
|
|
thunk->call_flat = (char *)call_flat_method - (char *)(&thunk->call_flat + 1);
|
|
#else
|
|
thunk->call_flat = (char *)proc - (char *)(&thunk->call_flat + 1);
|
|
#endif
|
|
}
|
|
|
|
#else
|
|
|
|
#include "pshpack1.h"
|
|
struct thunk
|
|
{
|
|
BYTE mov_r10[2];
|
|
void *this;
|
|
BYTE mov_r11[2];
|
|
void *proc;
|
|
BYTE mov_rax[2];
|
|
void *call_flat;
|
|
BYTE jmp_rax[2];
|
|
};
|
|
#include "poppack.h"
|
|
|
|
static const struct thunk thunk_template =
|
|
{
|
|
{ 0x49, 0xba }, 0, /* movq This, %r10 */
|
|
{ 0x49, 0xbb }, 0, /* movq proc, %r11 */
|
|
{ 0x48, 0xb8 }, 0, /* movq call_thunk, %rax */
|
|
{ 0xff, 0xe0 } /* jmp *%rax */
|
|
};
|
|
|
|
typedef void (*pfn_call_flat_method)(void);
|
|
|
|
extern pfn_call_flat_method
|
|
get_call_flat_method_pfn( int param_count, BOOL has_floats, BOOL is_4th_float );
|
|
|
|
static inline void init_thunk( struct thunk *thunk, void *this, void *proc,
|
|
int param_count, BOOL has_floats, BOOL is_4th_float )
|
|
{
|
|
*thunk = thunk_template;
|
|
thunk->this = this;
|
|
thunk->proc = proc;
|
|
thunk->call_flat = get_call_flat_method_pfn(param_count, has_floats, is_4th_float);
|
|
}
|
|
|
|
#endif
|
|
|
|
static inline struct thunk *alloc_thunks( unsigned int count )
|
|
{
|
|
return VirtualAlloc(NULL, count * sizeof(struct thunk),
|
|
MEM_COMMIT | MEM_RESERVE, PAGE_EXECUTE_READWRITE);
|
|
}
|