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
23namespace v8 {
24namespace internal {
25
26
27void 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