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// Copyright 2006-2009 the V8 project authors. All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following
// disclaimer in the documentation and/or other materials provided
// with the distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived
// from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
// CPU specific code for arm independent of OS goes here.
#ifdef __arm__
#include <sys/syscall.h> // for cache flushing.
#endif
#include "v8.h"
#if defined(V8_TARGET_ARCH_ARM)
#include "cpu.h"
#include "macro-assembler.h"
#include "simulator.h" // for cache flushing.
namespace v8 {
namespace internal {
void CPU::Setup() {
CpuFeatures::Probe(true);
if (!CpuFeatures::IsSupported(VFP3) || Serializer::enabled()) {
V8::DisableCrankshaft();
}
}
void CPU::FlushICache(void* start, size_t size) {
// Nothing to do flushing no instructions.
if (size == 0) {
return;
}
#if defined (USE_SIMULATOR)
// Not generating ARM instructions for C-code. This means that we are
// building an ARM emulator based target. We should notify the simulator
// that the Icache was flushed.
// None of this code ends up in the snapshot so there are no issues
// around whether or not to generate the code when building snapshots.
Simulator::FlushICache(start, size);
#else
// Ideally, we would call
// syscall(__ARM_NR_cacheflush, start,
// reinterpret_cast<intptr_t>(start) + size, 0);
// however, syscall(int, ...) is not supported on all platforms, especially
// not when using EABI, so we call the __ARM_NR_cacheflush syscall directly.
register uint32_t beg asm("a1") = reinterpret_cast<uint32_t>(start);
register uint32_t end asm("a2") =
reinterpret_cast<uint32_t>(start) + size;
register uint32_t flg asm("a3") = 0;
#ifdef __ARM_EABI__
#if defined (__arm__) && !defined(__thumb__)
// __arm__ may be defined in thumb mode.
register uint32_t scno asm("r7") = __ARM_NR_cacheflush;
asm volatile(
"svc 0x0"
: "=r" (beg)
: "0" (beg), "r" (end), "r" (flg), "r" (scno));
#else
// r7 is reserved by the EABI in thumb mode.
asm volatile(
"@ Enter ARM Mode \n\t"
"adr r3, 1f \n\t"
"bx r3 \n\t"
".ALIGN 4 \n\t"
".ARM \n"
"1: push {r7} \n\t"
"mov r7, %4 \n\t"
"svc 0x0 \n\t"
"pop {r7} \n\t"
"@ Enter THUMB Mode\n\t"
"adr r3, 2f+1 \n\t"
"bx r3 \n\t"
".THUMB \n"
"2: \n\t"
: "=r" (beg)
: "0" (beg), "r" (end), "r" (flg), "r" (__ARM_NR_cacheflush)
: "r3");
#endif
#else
#if defined (__arm__) && !defined(__thumb__)
// __arm__ may be defined in thumb mode.
asm volatile(
"svc %1"
: "=r" (beg)
: "i" (__ARM_NR_cacheflush), "0" (beg), "r" (end), "r" (flg));
#else
// Do not use the value of __ARM_NR_cacheflush in the inline assembly
// below, because the thumb mode value would be used, which would be
// wrong, since we switch to ARM mode before executing the svc instruction
asm volatile(
"@ Enter ARM Mode \n\t"
"adr r3, 1f \n\t"
"bx r3 \n\t"
".ALIGN 4 \n\t"
".ARM \n"
"1: svc 0x9f0002 \n"
"@ Enter THUMB Mode\n\t"
"adr r3, 2f+1 \n\t"
"bx r3 \n\t"
".THUMB \n"
"2: \n\t"
: "=r" (beg)
: "0" (beg), "r" (end), "r" (flg)
: "r3");
#endif
#endif
#endif
}
void CPU::DebugBreak() {
#if !defined (__arm__) || !defined(CAN_USE_ARMV5_INSTRUCTIONS)
UNIMPLEMENTED(); // when building ARM emulator target
#else
asm volatile("bkpt 0");
#endif
}
} } // namespace v8::internal
#endif // V8_TARGET_ARCH_ARM
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