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annotate src/cpu/x86/vm/relocInfo_x86.cpp @ 3719:5140bf905747
Removed mx/env from revision control.
author | Doug Simon <doug.simon@oracle.com> |
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date | Fri, 16 Dec 2011 13:37:14 +0100 |
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0 | 1 /* |
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2 * Copyright (c) 1998, 2011, Oracle and/or its affiliates. All rights reserved. |
0 | 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 * | |
1552
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "asm/assembler.inline.hpp" | |
27 #include "assembler_x86.inline.hpp" | |
28 #include "code/relocInfo.hpp" | |
29 #include "nativeInst_x86.hpp" | |
30 #include "oops/oop.inline.hpp" | |
31 #include "runtime/safepoint.hpp" | |
0 | 32 |
33 | |
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34 void Relocation::pd_set_data_value(address x, intptr_t o, bool verify_only) { |
0 | 35 #ifdef AMD64 |
36 x += o; | |
37 typedef Assembler::WhichOperand WhichOperand; | |
304 | 38 WhichOperand which = (WhichOperand) format(); // that is, disp32 or imm, call32, narrow oop |
0 | 39 assert(which == Assembler::disp32_operand || |
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40 which == Assembler::narrow_oop_operand || |
304 | 41 which == Assembler::imm_operand, "format unpacks ok"); |
42 if (which == Assembler::imm_operand) { | |
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43 if (verify_only) { |
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44 assert(*pd_address_in_code() == x, "instructions must match"); |
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45 } else { |
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46 *pd_address_in_code() = x; |
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47 } |
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48 } else if (which == Assembler::narrow_oop_operand) { |
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49 address disp = Assembler::locate_operand(addr(), which); |
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50 if (verify_only) { |
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51 assert(*(uint32_t*) disp == oopDesc::encode_heap_oop((oop)x), "instructions must match"); |
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52 } else { |
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53 *(int32_t*) disp = oopDesc::encode_heap_oop((oop)x); |
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54 } |
0 | 55 } else { |
56 // Note: Use runtime_call_type relocations for call32_operand. | |
57 address ip = addr(); | |
58 address disp = Assembler::locate_operand(ip, which); | |
59 address next_ip = Assembler::locate_next_instruction(ip); | |
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60 if (verify_only) { |
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61 assert(*(int32_t*) disp == (x - next_ip), "instructions must match"); |
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62 } else { |
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63 *(int32_t*) disp = x - next_ip; |
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64 } |
0 | 65 } |
66 #else | |
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67 if (verify_only) { |
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68 assert(*pd_address_in_code() == (x + o), "instructions must match"); |
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69 } else { |
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70 *pd_address_in_code() = x + o; |
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71 } |
0 | 72 #endif // AMD64 |
73 } | |
74 | |
75 | |
76 address Relocation::pd_call_destination(address orig_addr) { | |
77 intptr_t adj = 0; | |
78 if (orig_addr != NULL) { | |
79 // We just moved this call instruction from orig_addr to addr(). | |
80 // This means its target will appear to have grown by addr() - orig_addr. | |
81 adj = -( addr() - orig_addr ); | |
82 } | |
83 NativeInstruction* ni = nativeInstruction_at(addr()); | |
84 if (ni->is_call()) { | |
85 return nativeCall_at(addr())->destination() + adj; | |
86 } else if (ni->is_jump()) { | |
87 return nativeJump_at(addr())->jump_destination() + adj; | |
88 } else if (ni->is_cond_jump()) { | |
89 return nativeGeneralJump_at(addr())->jump_destination() + adj; | |
90 } else if (ni->is_mov_literal64()) { | |
91 return (address) ((NativeMovConstReg*)ni)->data(); | |
92 } else { | |
93 ShouldNotReachHere(); | |
94 return NULL; | |
95 } | |
96 } | |
97 | |
98 | |
99 void Relocation::pd_set_call_destination(address x) { | |
100 NativeInstruction* ni = nativeInstruction_at(addr()); | |
101 if (ni->is_call()) { | |
102 nativeCall_at(addr())->set_destination(x); | |
103 } else if (ni->is_jump()) { | |
104 NativeJump* nj = nativeJump_at(addr()); | |
304 | 105 |
106 // Unresolved jumps are recognized by a destination of -1 | |
107 // However 64bit can't actually produce such an address | |
108 // and encodes a jump to self but jump_destination will | |
109 // return a -1 as the signal. We must not relocate this | |
110 // jmp or the ic code will not see it as unresolved. | |
111 | |
0 | 112 if (nj->jump_destination() == (address) -1) { |
304 | 113 x = addr(); // jump to self |
0 | 114 } |
115 nj->set_jump_destination(x); | |
116 } else if (ni->is_cond_jump()) { | |
117 // %%%% kludge this, for now, until we get a jump_destination method | |
118 address old_dest = nativeGeneralJump_at(addr())->jump_destination(); | |
119 address disp = Assembler::locate_operand(addr(), Assembler::call32_operand); | |
120 *(jint*)disp += (x - old_dest); | |
121 } else if (ni->is_mov_literal64()) { | |
122 ((NativeMovConstReg*)ni)->set_data((intptr_t)x); | |
123 } else { | |
124 ShouldNotReachHere(); | |
125 } | |
126 } | |
127 | |
128 | |
129 address* Relocation::pd_address_in_code() { | |
130 // All embedded Intel addresses are stored in 32-bit words. | |
131 // Since the addr points at the start of the instruction, | |
132 // we must parse the instruction a bit to find the embedded word. | |
133 assert(is_data(), "must be a DataRelocation"); | |
134 typedef Assembler::WhichOperand WhichOperand; | |
304 | 135 WhichOperand which = (WhichOperand) format(); // that is, disp32 or imm/imm32 |
0 | 136 #ifdef AMD64 |
137 assert(which == Assembler::disp32_operand || | |
138 which == Assembler::call32_operand || | |
304 | 139 which == Assembler::imm_operand, "format unpacks ok"); |
140 if (which != Assembler::imm_operand) { | |
0 | 141 // The "address" in the code is a displacement can't return it as |
142 // and address* since it is really a jint* | |
143 ShouldNotReachHere(); | |
144 return NULL; | |
145 } | |
146 #else | |
304 | 147 assert(which == Assembler::disp32_operand || which == Assembler::imm_operand, "format unpacks ok"); |
0 | 148 #endif // AMD64 |
149 return (address*) Assembler::locate_operand(addr(), which); | |
150 } | |
151 | |
152 | |
153 address Relocation::pd_get_address_from_code() { | |
154 #ifdef AMD64 | |
155 // All embedded Intel addresses are stored in 32-bit words. | |
156 // Since the addr points at the start of the instruction, | |
157 // we must parse the instruction a bit to find the embedded word. | |
158 assert(is_data(), "must be a DataRelocation"); | |
159 typedef Assembler::WhichOperand WhichOperand; | |
304 | 160 WhichOperand which = (WhichOperand) format(); // that is, disp32 or imm/imm32 |
0 | 161 assert(which == Assembler::disp32_operand || |
162 which == Assembler::call32_operand || | |
304 | 163 which == Assembler::imm_operand, "format unpacks ok"); |
164 if (which != Assembler::imm_operand) { | |
0 | 165 address ip = addr(); |
166 address disp = Assembler::locate_operand(ip, which); | |
167 address next_ip = Assembler::locate_next_instruction(ip); | |
168 address a = next_ip + *(int32_t*) disp; | |
169 return a; | |
170 } | |
171 #endif // AMD64 | |
172 return *pd_address_in_code(); | |
173 } | |
174 | |
175 int Relocation::pd_breakpoint_size() { | |
176 // minimum breakpoint size, in short words | |
177 return NativeIllegalInstruction::instruction_size / sizeof(short); | |
178 } | |
179 | |
180 void Relocation::pd_swap_in_breakpoint(address x, short* instrs, int instrlen) { | |
181 Untested("pd_swap_in_breakpoint"); | |
182 if (instrs != NULL) { | |
183 assert(instrlen * sizeof(short) == NativeIllegalInstruction::instruction_size, "enough instrlen in reloc. data"); | |
184 for (int i = 0; i < instrlen; i++) { | |
185 instrs[i] = ((short*)x)[i]; | |
186 } | |
187 } | |
188 NativeIllegalInstruction::insert(x); | |
189 } | |
190 | |
191 | |
192 void Relocation::pd_swap_out_breakpoint(address x, short* instrs, int instrlen) { | |
193 Untested("pd_swap_out_breakpoint"); | |
194 assert(NativeIllegalInstruction::instruction_size == sizeof(short), "right address unit for update"); | |
195 NativeInstruction* ni = nativeInstruction_at(x); | |
196 *(short*)ni->addr_at(0) = instrs[0]; | |
197 } | |
304 | 198 |
199 void poll_Relocation::fix_relocation_after_move(const CodeBuffer* src, CodeBuffer* dest) { | |
200 #ifdef _LP64 | |
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201 if (!Assembler::is_polling_page_far()) { |
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202 typedef Assembler::WhichOperand WhichOperand; |
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203 WhichOperand which = (WhichOperand) format(); |
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204 // This format is imm but it is really disp32 |
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205 which = Assembler::disp32_operand; |
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206 address orig_addr = old_addr_for(addr(), src, dest); |
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207 NativeInstruction* oni = nativeInstruction_at(orig_addr); |
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208 int32_t* orig_disp = (int32_t*) Assembler::locate_operand(orig_addr, which); |
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209 // This poll_addr is incorrect by the size of the instruction it is irrelevant |
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210 intptr_t poll_addr = (intptr_t)oni + *orig_disp; |
304 | 211 |
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212 NativeInstruction* ni = nativeInstruction_at(addr()); |
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213 intptr_t new_disp = poll_addr - (intptr_t) ni; |
304 | 214 |
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215 int32_t* disp = (int32_t*) Assembler::locate_operand(addr(), which); |
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216 * disp = (int32_t)new_disp; |
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217 } |
304 | 218 #endif // _LP64 |
219 } | |
220 | |
221 void poll_return_Relocation::fix_relocation_after_move(const CodeBuffer* src, CodeBuffer* dest) { | |
222 #ifdef _LP64 | |
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223 if (!Assembler::is_polling_page_far()) { |
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224 typedef Assembler::WhichOperand WhichOperand; |
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225 WhichOperand which = (WhichOperand) format(); |
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226 // This format is imm but it is really disp32 |
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227 which = Assembler::disp32_operand; |
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228 address orig_addr = old_addr_for(addr(), src, dest); |
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229 NativeInstruction* oni = nativeInstruction_at(orig_addr); |
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230 int32_t* orig_disp = (int32_t*) Assembler::locate_operand(orig_addr, which); |
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231 // This poll_addr is incorrect by the size of the instruction it is irrelevant |
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232 intptr_t poll_addr = (intptr_t)oni + *orig_disp; |
304 | 233 |
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234 NativeInstruction* ni = nativeInstruction_at(addr()); |
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235 intptr_t new_disp = poll_addr - (intptr_t) ni; |
304 | 236 |
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237 int32_t* disp = (int32_t*) Assembler::locate_operand(addr(), which); |
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238 * disp = (int32_t)new_disp; |
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239 } |
304 | 240 #endif // _LP64 |
241 } |