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This patch adds memory support functions which will later be used to implement section-specific protection handling in MCJIT.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@164249 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Andrew Kaylor
2012-09-19 20:46:12 +00:00
parent 7b6f2034ac
commit bbf628b6ce
6 changed files with 747 additions and 90 deletions
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52
lib/Support/Memory.cpp
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@@ -16,10 +16,6 @@
#include "llvm/Support/Valgrind.h"
#include "llvm/Config/config.h"
namespace llvm {
using namespace sys;
}
// Include the platform-specific parts of this class.
#ifdef LLVM_ON_UNIX
#include "Unix/Memory.inc"
@@ -27,51 +23,3 @@ using namespace sys;
#ifdef LLVM_ON_WIN32
#include "Windows/Memory.inc"
#endif
extern "C" void sys_icache_invalidate(const void *Addr, size_t len);
/// InvalidateInstructionCache - Before the JIT can run a block of code
/// that has been emitted it must invalidate the instruction cache on some
/// platforms.
void llvm::sys::Memory::InvalidateInstructionCache(const void *Addr,
size_t Len) {
// icache invalidation for PPC and ARM.
#if defined(__APPLE__)
# if (defined(__POWERPC__) || defined (__ppc__) || \
defined(_POWER) || defined(_ARCH_PPC)) || defined(__arm__)
sys_icache_invalidate(const_cast<void *>(Addr), Len);
# endif
#else
# if (defined(__POWERPC__) || defined (__ppc__) || \
defined(_POWER) || defined(_ARCH_PPC)) && defined(__GNUC__)
const size_t LineSize = 32;
const intptr_t Mask = ~(LineSize - 1);
const intptr_t StartLine = ((intptr_t) Addr) & Mask;
const intptr_t EndLine = ((intptr_t) Addr + Len + LineSize - 1) & Mask;
for (intptr_t Line = StartLine; Line < EndLine; Line += LineSize)
asm volatile("dcbf 0, %0" : : "r"(Line));
asm volatile("sync");
for (intptr_t Line = StartLine; Line < EndLine; Line += LineSize)
asm volatile("icbi 0, %0" : : "r"(Line));
asm volatile("isync");
# elif defined(__arm__) && defined(__GNUC__)
// FIXME: Can we safely always call this for __GNUC__ everywhere?
const char *Start = static_cast<const char *>(Addr);
const char *End = Start + Len;
__clear_cache(const_cast<char *>(Start), const_cast<char *>(End));
# elif defined(__mips__)
const char *Start = static_cast<const char *>(Addr);
cacheflush(const_cast<char *>(Start), Len, BCACHE);
# endif
#endif // end apple
ValgrindDiscardTranslations(Addr, Len);
}