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// Copyright 2006-2009 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// CPU specific code for arm independent of OS goes here.
#ifdef __arm__
#ifdef __QNXNTO__
#include <sys/mman.h> // for cache flushing.
#undef MAP_TYPE // NOLINT
#else
#include <sys/syscall.h> // for cache flushing.
#endif
#endif
#if V8_TARGET_ARCH_ARM
#include "src/codegen/cpu-features.h"
namespace v8 {
namespace internal {
// The inlining of this seems to trigger an LTO bug that clobbers a register,
// see https://crbug.com/952759 and https://bugs.llvm.org/show_bug.cgi?id=41575.
V8_NOINLINE void CpuFeatures::FlushICache(void* start, size_t size) {
#if !defined(USE_SIMULATOR)
#if V8_OS_QNX
msync(start, size, MS_SYNC | MS_INVALIDATE_ICACHE);
#else
register uint32_t beg asm("r0") = reinterpret_cast<uint32_t>(start);
register uint32_t end asm("r1") = beg + size;
register uint32_t flg asm("r2") = 0;
#ifdef __clang__
// This variant of the asm avoids a constant pool entry, which can be
// problematic when LTO'ing. It is also slightly shorter.
register uint32_t scno asm("r7") = __ARM_NR_cacheflush;
asm volatile("svc 0\n"
:
: "r"(beg), "r"(end), "r"(flg), "r"(scno)
: "memory");
#else
// Use a different variant of the asm with GCC because some versions doesn't
// support r7 as an asm input.
asm volatile(
// This assembly works for both ARM and Thumb targets.
// Preserve r7; it is callee-saved, and GCC uses it as a frame pointer for
// Thumb targets.
" push {r7}\n"
// r0 = beg
// r1 = end
// r2 = flags (0)
" ldr r7, =%c[scno]\n" // r7 = syscall number
" svc 0\n"
" pop {r7}\n"
:
: "r"(beg), "r"(end), "r"(flg), [scno] "i"(__ARM_NR_cacheflush)
: "memory");
#endif
#endif
#endif // !USE_SIMULATOR
}
} // namespace internal
} // namespace v8
#endif // V8_TARGET_ARCH_ARM