relocInfo_x86.cpp revision 1472:c18cbe5936b8
1/* 2 * Copyright (c) 1998, 2008, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25# include "incls/_precompiled.incl" 26# include "incls/_relocInfo_x86.cpp.incl" 27 28 29void Relocation::pd_set_data_value(address x, intptr_t o) { 30#ifdef AMD64 31 x += o; 32 typedef Assembler::WhichOperand WhichOperand; 33 WhichOperand which = (WhichOperand) format(); // that is, disp32 or imm, call32, narrow oop 34 assert(which == Assembler::disp32_operand || 35 which == Assembler::narrow_oop_operand || 36 which == Assembler::imm_operand, "format unpacks ok"); 37 if (which == Assembler::imm_operand) { 38 *pd_address_in_code() = x; 39 } else if (which == Assembler::narrow_oop_operand) { 40 address disp = Assembler::locate_operand(addr(), which); 41 *(int32_t*) disp = oopDesc::encode_heap_oop((oop)x); 42 } else { 43 // Note: Use runtime_call_type relocations for call32_operand. 44 address ip = addr(); 45 address disp = Assembler::locate_operand(ip, which); 46 address next_ip = Assembler::locate_next_instruction(ip); 47 *(int32_t*) disp = x - next_ip; 48 } 49#else 50 *pd_address_in_code() = x + o; 51#endif // AMD64 52} 53 54 55address Relocation::pd_call_destination(address orig_addr) { 56 intptr_t adj = 0; 57 if (orig_addr != NULL) { 58 // We just moved this call instruction from orig_addr to addr(). 59 // This means its target will appear to have grown by addr() - orig_addr. 60 adj = -( addr() - orig_addr ); 61 } 62 NativeInstruction* ni = nativeInstruction_at(addr()); 63 if (ni->is_call()) { 64 return nativeCall_at(addr())->destination() + adj; 65 } else if (ni->is_jump()) { 66 return nativeJump_at(addr())->jump_destination() + adj; 67 } else if (ni->is_cond_jump()) { 68 return nativeGeneralJump_at(addr())->jump_destination() + adj; 69 } else if (ni->is_mov_literal64()) { 70 return (address) ((NativeMovConstReg*)ni)->data(); 71 } else { 72 ShouldNotReachHere(); 73 return NULL; 74 } 75} 76 77 78void Relocation::pd_set_call_destination(address x) { 79 NativeInstruction* ni = nativeInstruction_at(addr()); 80 if (ni->is_call()) { 81 nativeCall_at(addr())->set_destination(x); 82 } else if (ni->is_jump()) { 83 NativeJump* nj = nativeJump_at(addr()); 84 85 // Unresolved jumps are recognized by a destination of -1 86 // However 64bit can't actually produce such an address 87 // and encodes a jump to self but jump_destination will 88 // return a -1 as the signal. We must not relocate this 89 // jmp or the ic code will not see it as unresolved. 90 91 if (nj->jump_destination() == (address) -1) { 92 x = addr(); // jump to self 93 } 94 nj->set_jump_destination(x); 95 } else if (ni->is_cond_jump()) { 96 // %%%% kludge this, for now, until we get a jump_destination method 97 address old_dest = nativeGeneralJump_at(addr())->jump_destination(); 98 address disp = Assembler::locate_operand(addr(), Assembler::call32_operand); 99 *(jint*)disp += (x - old_dest); 100 } else if (ni->is_mov_literal64()) { 101 ((NativeMovConstReg*)ni)->set_data((intptr_t)x); 102 } else { 103 ShouldNotReachHere(); 104 } 105} 106 107 108address* Relocation::pd_address_in_code() { 109 // All embedded Intel addresses are stored in 32-bit words. 110 // Since the addr points at the start of the instruction, 111 // we must parse the instruction a bit to find the embedded word. 112 assert(is_data(), "must be a DataRelocation"); 113 typedef Assembler::WhichOperand WhichOperand; 114 WhichOperand which = (WhichOperand) format(); // that is, disp32 or imm/imm32 115#ifdef AMD64 116 assert(which == Assembler::disp32_operand || 117 which == Assembler::call32_operand || 118 which == Assembler::imm_operand, "format unpacks ok"); 119 if (which != Assembler::imm_operand) { 120 // The "address" in the code is a displacement can't return it as 121 // and address* since it is really a jint* 122 ShouldNotReachHere(); 123 return NULL; 124 } 125#else 126 assert(which == Assembler::disp32_operand || which == Assembler::imm_operand, "format unpacks ok"); 127#endif // AMD64 128 return (address*) Assembler::locate_operand(addr(), which); 129} 130 131 132address Relocation::pd_get_address_from_code() { 133#ifdef AMD64 134 // All embedded Intel addresses are stored in 32-bit words. 135 // Since the addr points at the start of the instruction, 136 // we must parse the instruction a bit to find the embedded word. 137 assert(is_data(), "must be a DataRelocation"); 138 typedef Assembler::WhichOperand WhichOperand; 139 WhichOperand which = (WhichOperand) format(); // that is, disp32 or imm/imm32 140 assert(which == Assembler::disp32_operand || 141 which == Assembler::call32_operand || 142 which == Assembler::imm_operand, "format unpacks ok"); 143 if (which != Assembler::imm_operand) { 144 address ip = addr(); 145 address disp = Assembler::locate_operand(ip, which); 146 address next_ip = Assembler::locate_next_instruction(ip); 147 address a = next_ip + *(int32_t*) disp; 148 return a; 149 } 150#endif // AMD64 151 return *pd_address_in_code(); 152} 153 154int Relocation::pd_breakpoint_size() { 155 // minimum breakpoint size, in short words 156 return NativeIllegalInstruction::instruction_size / sizeof(short); 157} 158 159void Relocation::pd_swap_in_breakpoint(address x, short* instrs, int instrlen) { 160 Untested("pd_swap_in_breakpoint"); 161 if (instrs != NULL) { 162 assert(instrlen * sizeof(short) == NativeIllegalInstruction::instruction_size, "enough instrlen in reloc. data"); 163 for (int i = 0; i < instrlen; i++) { 164 instrs[i] = ((short*)x)[i]; 165 } 166 } 167 NativeIllegalInstruction::insert(x); 168} 169 170 171void Relocation::pd_swap_out_breakpoint(address x, short* instrs, int instrlen) { 172 Untested("pd_swap_out_breakpoint"); 173 assert(NativeIllegalInstruction::instruction_size == sizeof(short), "right address unit for update"); 174 NativeInstruction* ni = nativeInstruction_at(x); 175 *(short*)ni->addr_at(0) = instrs[0]; 176} 177 178void poll_Relocation::fix_relocation_after_move(const CodeBuffer* src, CodeBuffer* dest) { 179#ifdef _LP64 180 typedef Assembler::WhichOperand WhichOperand; 181 WhichOperand which = (WhichOperand) format(); 182 // This format is imm but it is really disp32 183 which = Assembler::disp32_operand; 184 address orig_addr = old_addr_for(addr(), src, dest); 185 NativeInstruction* oni = nativeInstruction_at(orig_addr); 186 int32_t* orig_disp = (int32_t*) Assembler::locate_operand(orig_addr, which); 187 // This poll_addr is incorrect by the size of the instruction it is irrelevant 188 intptr_t poll_addr = (intptr_t)oni + *orig_disp; 189 190 NativeInstruction* ni = nativeInstruction_at(addr()); 191 intptr_t new_disp = poll_addr - (intptr_t) ni; 192 193 int32_t* disp = (int32_t*) Assembler::locate_operand(addr(), which); 194 * disp = (int32_t)new_disp; 195 196#endif // _LP64 197} 198 199void poll_return_Relocation::fix_relocation_after_move(const CodeBuffer* src, CodeBuffer* dest) { 200#ifdef _LP64 201 typedef Assembler::WhichOperand WhichOperand; 202 WhichOperand which = (WhichOperand) format(); 203 // This format is imm but it is really disp32 204 which = Assembler::disp32_operand; 205 address orig_addr = old_addr_for(addr(), src, dest); 206 NativeInstruction* oni = nativeInstruction_at(orig_addr); 207 int32_t* orig_disp = (int32_t*) Assembler::locate_operand(orig_addr, which); 208 // This poll_addr is incorrect by the size of the instruction it is irrelevant 209 intptr_t poll_addr = (intptr_t)oni + *orig_disp; 210 211 NativeInstruction* ni = nativeInstruction_at(addr()); 212 intptr_t new_disp = poll_addr - (intptr_t) ni; 213 214 int32_t* disp = (int32_t*) Assembler::locate_operand(addr(), which); 215 * disp = (int32_t)new_disp; 216#endif // _LP64 217} 218