--- /dev/null 2016-08-24 15:41:39.598575000 -0400 +++ new/src/cpu/arm/vm/macroAssembler_arm.inline.hpp 2016-12-13 12:52:02.825489474 -0500 @@ -0,0 +1,104 @@ +/* + * Copyright (c) 2008, 2014, Oracle and/or its affiliates. All rights reserved. + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. + * + * This code is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 only, as + * published by the Free Software Foundation. + * + * This code is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License + * version 2 for more details (a copy is included in the LICENSE file that + * accompanied this code). + * + * You should have received a copy of the GNU General Public License version + * 2 along with this work; if not, write to the Free Software Foundation, + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. + * + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA + * or visit www.oracle.com if you need additional information or have any + * questions. + * + */ + +#ifndef CPU_ARM_VM_MACROASSEMBLER_ARM_INLINE_HPP +#define CPU_ARM_VM_MACROASSEMBLER_ARM_INLINE_HPP + +#include "asm/assembler.inline.hpp" +#include "asm/codeBuffer.hpp" +#include "code/codeCache.hpp" +#include "runtime/handles.inline.hpp" + +inline void MacroAssembler::pd_patch_instruction(address branch, address target) { + int instr = *(int*)branch; + int new_offset = (int)(target - branch NOT_AARCH64(- 8)); + assert((new_offset & 3) == 0, "bad alignment"); + +#ifdef AARCH64 + if ((instr & (0x1f << 26)) == (0b00101 << 26)) { + // Unconditional B or BL + assert (is_offset_in_range(new_offset, 26), "offset is too large"); + *(int*)branch = (instr & ~right_n_bits(26)) | encode_offset(new_offset, 26, 0); + } else if ((instr & (0xff << 24)) == (0b01010100 << 24) && (instr & (1 << 4)) == 0) { + // Conditional B + assert (is_offset_in_range(new_offset, 19), "offset is too large"); + *(int*)branch = (instr & ~(right_n_bits(19) << 5)) | encode_offset(new_offset, 19, 5); + } else if ((instr & (0b111111 << 25)) == (0b011010 << 25)) { + // Compare & branch CBZ/CBNZ + assert (is_offset_in_range(new_offset, 19), "offset is too large"); + *(int*)branch = (instr & ~(right_n_bits(19) << 5)) | encode_offset(new_offset, 19, 5); + } else if ((instr & (0b111111 << 25)) == (0b011011 << 25)) { + // Test & branch TBZ/TBNZ + assert (is_offset_in_range(new_offset, 14), "offset is too large"); + *(int*)branch = (instr & ~(right_n_bits(14) << 5)) | encode_offset(new_offset, 14, 5); + } else if ((instr & (0b111011 << 24)) == (0b011000 << 24)) { + // LDR (literal) + unsigned opc = ((unsigned)instr >> 30); + assert (opc != 0b01 || ((uintx)target & 7) == 0, "ldr target should be aligned"); + assert (is_offset_in_range(new_offset, 19), "offset is too large"); + *(int*)branch = (instr & ~(right_n_bits(19) << 5)) | encode_offset(new_offset, 19, 5); + } else if (((instr & (1 << 31)) == 0) && ((instr & (0b11111 << 24)) == (0b10000 << 24))) { + // ADR + assert (is_imm_in_range(new_offset, 21, 0), "offset is too large"); + instr = (instr & ~(right_n_bits(2) << 29)) | (new_offset & 3) << 29; + *(int*)branch = (instr & ~(right_n_bits(19) << 5)) | encode_imm(new_offset >> 2, 19, 0, 5); + } else if((unsigned int)instr == address_placeholder_instruction) { + // address + assert (*(unsigned int *)(branch + InstructionSize) == address_placeholder_instruction, "address placeholder occupies two instructions"); + *(intx*)branch = (intx)target; + } else { + ::tty->print_cr("=============== instruction: 0x%x ================\n", instr); + Unimplemented(); // TODO-AARCH64 + } +#else + if ((instr & 0x0e000000) == 0x0a000000) { + // B or BL instruction + assert(new_offset < 0x2000000 && new_offset > -0x2000000, "encoding constraint"); + *(int*)branch = (instr & 0xff000000) | ((unsigned int)new_offset << 6 >> 8); + } else if((unsigned int)instr == address_placeholder_instruction) { + // address + *(int*)branch = (int)target; + } else if ((instr & 0x0fff0000) == 0x028f0000 || ((instr & 0x0fff0000) == 0x024f0000)) { + // ADR + int encoding = 0x8 << 20; // ADD + if (new_offset < 0) { + encoding = 0x4 << 20; // SUB + new_offset = -new_offset; + } + AsmOperand o(new_offset); + *(int*)branch = (instr & 0xff0ff000) | encoding | o.encoding(); + } else { + // LDR Rd, [PC, offset] instruction + assert((instr & 0x0f7f0000) == 0x051f0000, "Must be ldr_literal"); + assert(new_offset < 4096 && new_offset > -4096, "encoding constraint"); + if (new_offset >= 0) { + *(int*)branch = (instr & 0xff0ff000) | 9 << 20 | new_offset; + } else { + *(int*)branch = (instr & 0xff0ff000) | 1 << 20 | -new_offset; + } + } +#endif // AARCH64 +} + +#endif // CPU_ARM_VM_MACROASSEMBLER_ARM_INLINE_HPP