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
FlushICache(void * start,size_t size)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