recompiled_code.h

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#pragma once
 
#include <csetjmp>
#include <cstddef>
#include <span>
 
#include <rex/platform.h>
#include <rex/types.h>
 
#if REX_PLATFORM_WIN32
#include <rex/platform/dynlib.h>
#endif
 
struct PPCContext;
 
using PPCFunc = void(PPCContext& ctx, u8* base);
 
namespace rex::ppc {
REX_PPC_API PPCFunc* ResolveFunction(u32 guest_address);

REX_PPC_API void Trap(PPCContext& ctx, u8* base, u16 trap_type);

REX_PPC_API std::jmp_buf& GetJumpBuffer(u32 address);

[[noreturn]] REX_PPC_API void LongJump(u32 address, int value);

[[noreturn]] REX_PPC_API void UnimplementedInstruction(const char* opcode);
}  // namespace rex::ppc

#define REX_FUNC(x) void x([[maybe_unused]] PPCContext& __restrict ctx, [[maybe_unused]] u8* base)

#define REX_EXTERN(x) extern "C" REX_FUNC(x)
 
struct PPCFuncMapping {
  size_t address;
  PPCFunc* host;
};

extern const PPCFuncMapping kPPCFuncMappings[];

#if REX_PLATFORM_MAC
#define REX_RECOMPILED_CODE_SECTION \
  __attribute__((section("__TEXT,__rexguest,regular,pure_instructions")))
#else
#define REX_RECOMPILED_CODE_SECTION __attribute__((section("rexguest")))
#endif
 
#if REX_PLATFORM_WIN32
extern "C" const char __ImageBase;
#elif REX_PLATFORM_MAC
extern "C" const ::rex::u8 rex_recompiled_code_begin __asm("section$start$__TEXT$__rexguest");
extern "C" const ::rex::u8 rex_recompiled_code_end __asm("section$end$__TEXT$__rexguest");
#else
extern "C" __attribute__((weak, visibility("hidden"))) const ::rex::u8 __start_rexguest[];
extern "C" __attribute__((weak, visibility("hidden"))) const ::rex::u8 __stop_rexguest[];
#endif

#if REX_PLATFORM_WIN32
#define REX_RECOMPILED_CODE() ::rex::platform::FindImageSection(&__ImageBase, "rexguest")
#elif REX_PLATFORM_MAC
#define REX_RECOMPILED_CODE() \
  ::std::span<const ::rex::u8>(&rex_recompiled_code_begin, &rex_recompiled_code_end)
#else
#define REX_RECOMPILED_CODE() ::std::span<const ::rex::u8>(__start_rexguest, __stop_rexguest)
#endif
 
namespace rex::ppc {

REX_PPC_API bool AddRecompiledCode(std::span<const u8> code);

REX_PPC_API void RemoveRecompiledCode(std::span<const u8> code);

REX_PPC_API bool IsRecompiledCode(u64 address);
 
}  // namespace rex::ppc