diff options
Diffstat (limited to 'Source/JavaScriptCore/assembler/ARMv7Assembler.h')
| -rw-r--r-- | Source/JavaScriptCore/assembler/ARMv7Assembler.h | 45 |
1 files changed, 42 insertions, 3 deletions
diff --git a/Source/JavaScriptCore/assembler/ARMv7Assembler.h b/Source/JavaScriptCore/assembler/ARMv7Assembler.h index b93ec6e63..aa402e208 100644 --- a/Source/JavaScriptCore/assembler/ARMv7Assembler.h +++ b/Source/JavaScriptCore/assembler/ARMv7Assembler.h @@ -1262,6 +1262,20 @@ public: m_formatter.twoWordOp5i6Imm4Reg4EncodedImm(OP_MOV_imm_T3, imm.m_value.imm4, rd, imm); } +#if OS(LINUX) || OS(QNX) + static void revertJumpTo_movT3movtcmpT2(void* instructionStart, RegisterID left, RegisterID right, uintptr_t imm) + { + uint16_t* address = static_cast<uint16_t*>(instructionStart); + ARMThumbImmediate lo16 = ARMThumbImmediate::makeUInt16(static_cast<uint16_t>(imm)); + ARMThumbImmediate hi16 = ARMThumbImmediate::makeUInt16(static_cast<uint16_t>(imm >> 16)); + address[0] = twoWordOp5i6Imm4Reg4EncodedImmFirst(OP_MOV_imm_T3, lo16); + address[1] = twoWordOp5i6Imm4Reg4EncodedImmSecond(right, lo16); + address[2] = twoWordOp5i6Imm4Reg4EncodedImmFirst(OP_MOVT, hi16); + address[3] = twoWordOp5i6Imm4Reg4EncodedImmSecond(right, hi16); + address[4] = OP_CMP_reg_T2 | left; + cacheFlush(address, sizeof(uint16_t) * 5); + } +#else static void revertJumpTo_movT3(void* instructionStart, RegisterID rd, ARMThumbImmediate imm) { ASSERT(imm.isValid()); @@ -1273,6 +1287,7 @@ public: address[1] = twoWordOp5i6Imm4Reg4EncodedImmSecond(rd, imm); cacheFlush(address, sizeof(uint16_t) * 2); } +#endif ALWAYS_INLINE void mov(RegisterID rd, ARMThumbImmediate imm) { @@ -1858,7 +1873,12 @@ public: { m_formatter.oneWordOp8Imm8(OP_NOP_T1, 0); } - + + void nopw() + { + m_formatter.twoWordOp16Op16(OP_NOP_T2a, OP_NOP_T2b); + } + AssemblerLabel labelIgnoringWatchpoints() { return m_formatter.label(); @@ -1878,7 +1898,10 @@ public: { AssemblerLabel result = m_formatter.label(); while (UNLIKELY(static_cast<int>(result.m_offset) < m_indexOfTailOfLastWatchpoint)) { - nop(); + if (UNLIKELY(static_cast<int>(result.m_offset) + 4 <= m_indexOfTailOfLastWatchpoint)) + nopw(); + else + nop(); result = m_formatter.label(); } return result; @@ -2136,15 +2159,31 @@ public: { ASSERT(!(bitwise_cast<uintptr_t>(instructionStart) & 1)); ASSERT(!(bitwise_cast<uintptr_t>(to) & 1)); + +#if OS(LINUX) || OS(QNX) + if (canBeJumpT4(reinterpret_cast<uint16_t*>(instructionStart), to)) { + uint16_t* ptr = reinterpret_cast<uint16_t*>(instructionStart) + 2; + linkJumpT4(ptr, to); + cacheFlush(ptr - 2, sizeof(uint16_t) * 2); + } else { + uint16_t* ptr = reinterpret_cast<uint16_t*>(instructionStart) + 5; + linkBX(ptr, to); + cacheFlush(ptr - 5, sizeof(uint16_t) * 5); + } +#else uint16_t* ptr = reinterpret_cast<uint16_t*>(instructionStart) + 2; - linkJumpT4(ptr, to); cacheFlush(ptr - 2, sizeof(uint16_t) * 2); +#endif } static ptrdiff_t maxJumpReplacementSize() { +#if OS(LINUX) || OS(QNX) + return 10; +#else return 4; +#endif } static void replaceWithLoad(void* instructionStart) |