1 // Copyright 2006-2009 the V8 project authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 // CPU specific code for arm independent of OS goes here. 6 #ifdef __arm__ 7 #ifdef __QNXNTO__ 8 #include <sys/mman.h> // for cache flushing. 9 #undef MAP_TYPE 10 #else 11 #include <sys/syscall.h> // for cache flushing. 12 #endif 13 #endif 14 15 #include "src/v8.h" 16 17 #if V8_TARGET_ARCH_ARM 18 19 #include "src/assembler.h" 20 #include "src/macro-assembler.h" 21 #include "src/simulator.h" // for cache flushing. 22 23 namespace v8 { 24 namespace internal { 25 26 27 void CpuFeatures::FlushICache(void* start, size_t size) { 28 if (size == 0) return; 29 30 #if defined(USE_SIMULATOR) 31 // Not generating ARM instructions for C-code. This means that we are 32 // building an ARM emulator based target. We should notify the simulator 33 // that the Icache was flushed. 34 // None of this code ends up in the snapshot so there are no issues 35 // around whether or not to generate the code when building snapshots. 36 Simulator::FlushICache(Isolate::Current()->simulator_i_cache(), start, size); 37 38 #elif V8_OS_QNX 39 msync(start, size, MS_SYNC | MS_INVALIDATE_ICACHE); 40 41 #else 42 register uint32_t beg asm("r0") = reinterpret_cast<uint32_t>(start); 43 register uint32_t end asm("r1") = beg + size; 44 register uint32_t flg asm("r2") = 0; 45 46 asm volatile( 47 // This assembly works for both ARM and Thumb targets. 48 49 // Preserve r7; it is callee-saved, and GCC uses it as a frame pointer for 50 // Thumb targets. 51 " push {r7}\n" 52 // r0 = beg 53 // r1 = end 54 // r2 = flags (0) 55 " ldr r7, =%c[scno]\n" // r7 = syscall number 56 " svc 0\n" 57 58 " pop {r7}\n" 59 : 60 : "r" (beg), "r" (end), "r" (flg), [scno] "i" (__ARM_NR_cacheflush) 61 : "memory"); 62 #endif 63 } 64 65 } } // namespace v8::internal 66 67 #endif // V8_TARGET_ARCH_ARM 68
