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