diff options
Diffstat (limited to 'lib/Support/Memory.cpp')
| -rw-r--r-- | lib/Support/Memory.cpp | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/lib/Support/Memory.cpp b/lib/Support/Memory.cpp index a9689b2c39..1294744649 100644 --- a/lib/Support/Memory.cpp +++ b/lib/Support/Memory.cpp @@ -30,6 +30,39 @@ using namespace sys; extern "C" void sys_icache_invalidate(const void *Addr, size_t len); +/// ClearMipsCache - Invalidates instruction cache for Mips. This assembly code +/// is copied from the MIPS32 Instruction Set Reference. Since the code ends +/// with the return instruction "jr.hb ra" (Jump Register with Hazard Barrier), +/// it must be implemented as a function (which is called from the +/// InvalidateInstructionCache function). It cannot be directly inlined into +/// InvalidateInstructionCache function, because in that case the epilog of +/// InvalidateInstructionCache will not be executed. +#if defined(__mips__) +extern "C" void ClearMipsCache(const void* Addr, size_t Size); + asm volatile( + ".text\n" + ".align 2\n" + ".globl ClearMipsCache\n" + "ClearMipsCache:\n" + ".set noreorder\n" + "beq $a1, $zero, 20f\n" /* If size==0, branch around */ + "nop\n" + "addu $a1, $a0, $a1\n" /* Calculate end address + 1 */ + "rdhwr $v0, $1\n" /* Get step size for SYNCI */ + /* $1 is $HW_SYNCI_Step */ + "beq $v0, $zero, 20f\n" /* If no caches require synchronization, */ + /* branch around */ + "nop\n" + "10: synci 0($a0)\n" /* Synchronize all caches around address */ + "sltu $v1, $a0, $a1\n" /* Compare current with end address */ + "bne $v1, $zero, 10b\n" /* Branch if more to do */ + "addu $a0, $a0, $v0\n" /* Add step size in delay slot */ + "sync\n" /* Clear memory hazards */ + "20: jr.hb $ra\n" /* Return, clearing instruction hazards */ + "nop\n" + ); +#endif + /// InvalidateInstructionCache - Before the JIT can run a block of code /// that has been emitted it must invalidate the instruction cache on some /// platforms. @@ -66,6 +99,8 @@ void llvm::sys::Memory::InvalidateInstructionCache(const void *Addr, char *Start = (char*) Addr; char *End = Start + Len; __clear_cache(Start, End); +# elif defined(__mips__) + ClearMipsCache(Addr, Len); # endif #endif // end apple |