fix missing ___clear_cache when targetting iOS

Author: MrCyjaneK

CMakeLists.txt

@@ -56,6 +56,17 @@ src/virtual_machine.cpp
 src/vm_compiled_light.cpp
 src/blake2/blake2b.c)
 
+if (NOT WIN32)
+    check_symbol_exists("__builtin___clear_cache" "stdlib.h" HAVE_BUILTIN_CLEAR_CACHE)
+    if (HAVE_BUILTIN_CLEAR_CACHE)
+        add_definitions(-DHAVE_BUILTIN_CLEAR_CACHE)
+    endif()
+endif()
+
+if (CMAKE_CXX_COMPILER_ID MATCHES GNU)
+  add_definitions(-D_GNU_SOURCE -DHAVE_BUILTIN_CLEAR_CACHE)
+endif()
+
 if(NOT ARCH_ID)
   # allow cross compiling
   if(CMAKE_SYSTEM_PROCESSOR STREQUAL "")

src/jit_compiler_a64.cpp

@@ -32,6 +32,9 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #include "program.hpp"
 #include "reciprocal.h"
 #include "virtual_memory.h"
+#ifndef HAVE_BUILTIN_CLEAR_CACHE
+#include <libkern/OSCacheControl.h>
+#endif
 
 namespace ARMV8A {
 
@@ -98,8 +101,10 @@ JitCompilerA64::JitCompilerA64()
 	memset(reg_changed_offset, 0, sizeof(reg_changed_offset));
 	memcpy(code, (void*) randomx_program_aarch64, CodeSize);
 
-#ifdef __GNUC__
-	__builtin___clear_cache(reinterpret_cast<char*>(code), reinterpret_cast<char*>(code + CodeSize));
+#ifdef HAVE_BUILTIN_CLEAR_CACHE
+ 	__builtin___clear_cache(reinterpret_cast<char*>(code), reinterpret_cast<char*>(code + CodeSize));
+#else
+ 	sys_icache_invalidate(code, (size_t)(CodeSize));
 #endif
 }
 
@@ -169,8 +174,10 @@ void JitCompilerA64::generateProgram(Program& program, ProgramConfiguration& con
 	codePos = ((uint8_t*)randomx_program_aarch64_update_spMix1) - ((uint8_t*)randomx_program_aarch64);
 	emit32(ARMV8A::EOR | 10 | (IntRegMap[config.readReg0] << 5) | (IntRegMap[config.readReg1] << 16), code, codePos);
 
-#ifdef __GNUC__
-	__builtin___clear_cache(reinterpret_cast<char*>(code + MainLoopBegin), reinterpret_cast<char*>(code + codePos));
+#ifdef HAVE_BUILTIN_CLEAR_CACHE
+ 	__builtin___clear_cache(reinterpret_cast<char*>(code), reinterpret_cast<char*>(code + CodeSize));
+#else
+ 	sys_icache_invalidate(code, (size_t)(CodeSize));
 #endif
 }
 
@@ -226,8 +233,10 @@ void JitCompilerA64::generateProgramLight(Program& program, ProgramConfiguration
 	emit32(ARMV8A::ADD_IMM_LO | 2 | (2 << 5) | (imm_lo << 10), code, codePos);
 	emit32(ARMV8A::ADD_IMM_HI | 2 | (2 << 5) | (imm_hi << 10), code, codePos);
 
-#ifdef __GNUC__
-	__builtin___clear_cache(reinterpret_cast<char*>(code + MainLoopBegin), reinterpret_cast<char*>(code + codePos));
+#ifdef HAVE_BUILTIN_CLEAR_CACHE
+ 	__builtin___clear_cache(reinterpret_cast<char*>(code), reinterpret_cast<char*>(code + CodeSize));
+#else
+ 	sys_icache_invalidate(code, (size_t)(CodeSize));
 #endif
 }
 
@@ -344,8 +353,10 @@ void JitCompilerA64::generateSuperscalarHash(SuperscalarProgram(&programs)[N], s
 	memcpy(code + codePos, p1, p2 - p1);
 	codePos += p2 - p1;
 
-#ifdef __GNUC__
-	__builtin___clear_cache(reinterpret_cast<char*>(code + CodeSize), reinterpret_cast<char*>(code + codePos));
+#ifdef HAVE_BUILTIN_CLEAR_CACHE
+ 	__builtin___clear_cache(reinterpret_cast<char*>(code), reinterpret_cast<char*>(code + CodeSize));
+#else
+ 	sys_icache_invalidate(code, (size_t)(CodeSize));
 #endif
 }