36 // We have interfaces for the following instructions:
37 // - NativeInstruction
38 // - - NativeCall
39 // - - NativeMovConstReg
40 // - - NativeMovConstRegPatching
41 // - - NativeMovRegMem
42 // - - NativeMovRegMemPatching
43 // - - NativeJump
44 // - - NativeIllegalOpCode
45 // - - NativeGeneralJump
46 // - - NativeReturn
47 // - - NativeReturnX (return with argument)
48 // - - NativePushConst
49 // - - NativeTstRegMem
50
51 // The base class for different kinds of native instruction abstractions.
52 // Provides the primitive operations to manipulate code relative to this.
53
54 class NativeInstruction VALUE_OBJ_CLASS_SPEC {
55 friend class Relocation;
56 public:
57 enum { instruction_size = 4 };
58 inline bool is_nop();
59 bool is_dtrace_trap();
60 inline bool is_illegal();
61 inline bool is_return();
62 bool is_jump();
63 inline bool is_jump_or_nop();
64 inline bool is_cond_jump();
65 bool is_safepoint_poll();
66 inline bool is_mov_literal64();
67 bool is_movz();
68 bool is_movk();
69
70 protected:
71 address addr_at(int offset) const { return address(this) + offset; }
72
73 s_char sbyte_at(int offset) const { return *(s_char*) addr_at(offset); }
74 u_char ubyte_at(int offset) const { return *(u_char*) addr_at(offset); }
75
76 jint int_at(int offset) const { return *(jint*) addr_at(offset); }
77
78 intptr_t ptr_at(int offset) const { return *(intptr_t*) addr_at(offset); }
79
80 oop oop_at (int offset) const { return *(oop*) addr_at(offset); }
81
82
83 void set_char_at(int offset, char c) { *addr_at(offset) = (u_char)c; }
84 void set_int_at(int offset, jint i) { *(jint*)addr_at(offset) = i; }
85 void set_ptr_at (int offset, intptr_t ptr) { *(intptr_t*) addr_at(offset) = ptr; }
86 void set_oop_at (int offset, oop o) { *(oop*) addr_at(offset) = o; }
87
88 public:
89
90 // unit test stuff
91 static void test() {} // override for testing
92
93 inline friend NativeInstruction* nativeInstruction_at(address address);
94
95 static bool is_adrp_at(address instr);
96 static bool is_ldr_literal_at(address instr);
97 static bool is_ldrw_to_zr(address instr);
98
99 static bool maybe_cpool_ref(address instr) {
100 return is_adrp_at(instr) || is_ldr_literal_at(instr);
101 }
102 };
103
104 inline NativeInstruction* nativeInstruction_at(address address) {
105 return (NativeInstruction*)address;
113 inline NativeCall* nativeCall_at(address address);
114 // The NativeCall is an abstraction for accessing/manipulating native call imm32/rel32off
115 // instructions (used to manipulate inline caches, primitive & dll calls, etc.).
116
117 class NativeCall: public NativeInstruction {
118 public:
119 enum Aarch64_specific_constants {
120 instruction_size = 4,
121 instruction_offset = 0,
122 displacement_offset = 0,
123 return_address_offset = 4
124 };
125
126 enum { cache_line_size = BytesPerWord }; // conservative estimate!
127 address instruction_address() const { return addr_at(instruction_offset); }
128 address next_instruction_address() const { return addr_at(return_address_offset); }
129 int displacement() const { return (int_at(displacement_offset) << 6) >> 4; }
130 address displacement_address() const { return addr_at(displacement_offset); }
131 address return_address() const { return addr_at(return_address_offset); }
132 address destination() const;
133 void set_destination(address dest) {
134 int offset = dest - instruction_address();
135 unsigned int insn = 0b100101 << 26;
136 assert((offset & 3) == 0, "should be");
137 offset >>= 2;
138 offset &= (1 << 26) - 1; // mask off insn part
139 insn |= offset;
140 set_int_at(displacement_offset, insn);
141 ICache::invalidate_range(instruction_address(), instruction_size);
142 }
143
144 // Similar to replace_mt_safe, but just changes the destination. The
145 // important thing is that free-running threads are able to execute
146 // this call instruction at all times. If the call is an immediate BL
147 // instruction we can simply rely on atomicity of 32-bit writes to
148 // make sure other threads will see no intermediate states.
149
150 // We cannot rely on locks here, since the free-running threads must run at
151 // full speed.
152 //
153 // Used in the runtime linkage of calls; see class CompiledIC.
154 // (Cf. 4506997 and 4479829, where threads witnessed garbage displacements.)
155 void set_destination_mt_safe(address dest) { set_destination(dest); }
156
157 void verify_alignment() { ; }
158 void verify();
159 void print();
160
161 // Creation
162 inline friend NativeCall* nativeCall_at(address address);
163 inline friend NativeCall* nativeCall_before(address return_address);
164
165 static bool is_call_at(address instr) {
166 const uint32_t insn = (*(uint32_t*)instr);
167 return (insn >> 26) == 0b100101;
168 }
169
170 static bool is_call_before(address return_address) {
171 return is_call_at(return_address - NativeCall::return_address_offset);
172 }
173
174 // MT-safe patching of a call instruction.
175 static void insert(address code_pos, address entry);
176
177 static void replace_mt_safe(address instr_addr, address code_buffer);
178 };
179
180 inline NativeCall* nativeCall_at(address address) {
181 NativeCall* call = (NativeCall*)(address - NativeCall::instruction_offset);
182 #ifdef ASSERT
183 call->verify();
184 #endif
185 return call;
186 }
187
188 inline NativeCall* nativeCall_before(address return_address) {
189 NativeCall* call = (NativeCall*)(return_address - NativeCall::return_address_offset);
190 #ifdef ASSERT
191 call->verify();
192 #endif
193 return call;
194 }
195
196 // An interface for accessing/manipulating native mov reg, imm instructions.
197 // (used to manipulate inlined 64-bit data calls, etc.)
361 static void test() {}
362
363 // Insertion of native jump instruction
364 static void insert(address code_pos, address entry);
365 // MT-safe insertion of native jump at verified method entry
366 static void check_verified_entry_alignment(address entry, address verified_entry);
367 static void patch_verified_entry(address entry, address verified_entry, address dest);
368 };
369
370 inline NativeJump* nativeJump_at(address address) {
371 NativeJump* jump = (NativeJump*)(address - NativeJump::instruction_offset);
372 #ifdef ASSERT
373 jump->verify();
374 #endif
375 return jump;
376 }
377
378 class NativeGeneralJump: public NativeJump {
379 public:
380 enum AArch64_specific_constants {
381 instruction_size = 4,
382 instruction_offset = 0,
383 data_offset = 0,
384 next_instruction_offset = 4
385 };
386 static void insert_unconditional(address code_pos, address entry);
387 static void replace_mt_safe(address instr_addr, address code_buffer);
388 static void verify();
389 };
390
391 inline NativeGeneralJump* nativeGeneralJump_at(address address) {
392 NativeGeneralJump* jump = (NativeGeneralJump*)(address);
393 debug_only(jump->verify();)
394 return jump;
395 }
396
397 class NativePopReg : public NativeInstruction {
398 public:
399 // Insert a pop instruction
400 static void insert(address code_pos, Register reg);
401 };
402
403
404 class NativeIllegalInstruction: public NativeInstruction {
431 uint32_t insn = *(uint32_t*)addr_at(0);
432
433 if (Instruction_aarch64::extract(insn, 30, 26) == 0b00101) {
434 // Unconditional branch (immediate)
435 return true;
436 } else if (Instruction_aarch64::extract(insn, 31, 25) == 0b0101010) {
437 // Conditional branch (immediate)
438 return true;
439 } else if (Instruction_aarch64::extract(insn, 30, 25) == 0b011010) {
440 // Compare & branch (immediate)
441 return true;
442 } else if (Instruction_aarch64::extract(insn, 30, 25) == 0b011011) {
443 // Test & branch (immediate)
444 return true;
445 } else
446 return false;
447 }
448
449 inline bool NativeInstruction::is_jump_or_nop() {
450 return is_nop() || is_jump();
451 }
452
453 #endif // CPU_AARCH64_VM_NATIVEINST_AARCH64_HPP
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36 // We have interfaces for the following instructions:
37 // - NativeInstruction
38 // - - NativeCall
39 // - - NativeMovConstReg
40 // - - NativeMovConstRegPatching
41 // - - NativeMovRegMem
42 // - - NativeMovRegMemPatching
43 // - - NativeJump
44 // - - NativeIllegalOpCode
45 // - - NativeGeneralJump
46 // - - NativeReturn
47 // - - NativeReturnX (return with argument)
48 // - - NativePushConst
49 // - - NativeTstRegMem
50
51 // The base class for different kinds of native instruction abstractions.
52 // Provides the primitive operations to manipulate code relative to this.
53
54 class NativeInstruction VALUE_OBJ_CLASS_SPEC {
55 friend class Relocation;
56 friend bool is_NativeCallTrampolineStub_at(address);
57 public:
58 enum { instruction_size = 4 };
59 inline bool is_nop();
60 bool is_dtrace_trap();
61 inline bool is_illegal();
62 inline bool is_return();
63 bool is_jump();
64 inline bool is_jump_or_nop();
65 inline bool is_cond_jump();
66 bool is_safepoint_poll();
67 inline bool is_mov_literal64();
68 bool is_movz();
69 bool is_movk();
70 bool is_sigill_zombie_not_entrant();
71
72 protected:
73 address addr_at(int offset) const { return address(this) + offset; }
74
75 s_char sbyte_at(int offset) const { return *(s_char*) addr_at(offset); }
76 u_char ubyte_at(int offset) const { return *(u_char*) addr_at(offset); }
77
78 jint int_at(int offset) const { return *(jint*) addr_at(offset); }
79 juint uint_at(int offset) const { return *(juint*) addr_at(offset); }
80
81 address ptr_at(int offset) const { return *(address*) addr_at(offset); }
82
83 oop oop_at (int offset) const { return *(oop*) addr_at(offset); }
84
85
86 void set_char_at(int offset, char c) { *addr_at(offset) = (u_char)c; }
87 void set_int_at(int offset, jint i) { *(jint*)addr_at(offset) = i; }
88 void set_uint_at(int offset, jint i) { *(juint*)addr_at(offset) = i; }
89 void set_ptr_at (int offset, address ptr) { *(address*) addr_at(offset) = ptr; }
90 void set_oop_at (int offset, oop o) { *(oop*) addr_at(offset) = o; }
91
92 public:
93
94 // unit test stuff
95 static void test() {} // override for testing
96
97 inline friend NativeInstruction* nativeInstruction_at(address address);
98
99 static bool is_adrp_at(address instr);
100 static bool is_ldr_literal_at(address instr);
101 static bool is_ldrw_to_zr(address instr);
102
103 static bool maybe_cpool_ref(address instr) {
104 return is_adrp_at(instr) || is_ldr_literal_at(instr);
105 }
106 };
107
108 inline NativeInstruction* nativeInstruction_at(address address) {
109 return (NativeInstruction*)address;
117 inline NativeCall* nativeCall_at(address address);
118 // The NativeCall is an abstraction for accessing/manipulating native call imm32/rel32off
119 // instructions (used to manipulate inline caches, primitive & dll calls, etc.).
120
121 class NativeCall: public NativeInstruction {
122 public:
123 enum Aarch64_specific_constants {
124 instruction_size = 4,
125 instruction_offset = 0,
126 displacement_offset = 0,
127 return_address_offset = 4
128 };
129
130 enum { cache_line_size = BytesPerWord }; // conservative estimate!
131 address instruction_address() const { return addr_at(instruction_offset); }
132 address next_instruction_address() const { return addr_at(return_address_offset); }
133 int displacement() const { return (int_at(displacement_offset) << 6) >> 4; }
134 address displacement_address() const { return addr_at(displacement_offset); }
135 address return_address() const { return addr_at(return_address_offset); }
136 address destination() const;
137
138 void set_destination(address dest) {
139 int offset = dest - instruction_address();
140 unsigned int insn = 0b100101 << 26;
141 assert((offset & 3) == 0, "should be");
142 offset >>= 2;
143 offset &= (1 << 26) - 1; // mask off insn part
144 insn |= offset;
145 set_int_at(displacement_offset, insn);
146 }
147
148 void verify_alignment() { ; }
149 void verify();
150 void print();
151
152 // Creation
153 inline friend NativeCall* nativeCall_at(address address);
154 inline friend NativeCall* nativeCall_before(address return_address);
155
156 static bool is_call_at(address instr) {
157 const uint32_t insn = (*(uint32_t*)instr);
158 return (insn >> 26) == 0b100101;
159 }
160
161 static bool is_call_before(address return_address) {
162 return is_call_at(return_address - NativeCall::return_address_offset);
163 }
164
165 // MT-safe patching of a call instruction.
166 static void insert(address code_pos, address entry);
167
168 static void replace_mt_safe(address instr_addr, address code_buffer);
169
170 // Similar to replace_mt_safe, but just changes the destination. The
171 // important thing is that free-running threads are able to execute
172 // this call instruction at all times. If the call is an immediate BL
173 // instruction we can simply rely on atomicity of 32-bit writes to
174 // make sure other threads will see no intermediate states.
175
176 // We cannot rely on locks here, since the free-running threads must run at
177 // full speed.
178 //
179 // Used in the runtime linkage of calls; see class CompiledIC.
180 // (Cf. 4506997 and 4479829, where threads witnessed garbage displacements.)
181
182 // The parameter assert_lock disables the assertion during code generation.
183 void set_destination_mt_safe(address dest, bool assert_lock = true);
184
185 address get_trampoline();
186 };
187
188 inline NativeCall* nativeCall_at(address address) {
189 NativeCall* call = (NativeCall*)(address - NativeCall::instruction_offset);
190 #ifdef ASSERT
191 call->verify();
192 #endif
193 return call;
194 }
195
196 inline NativeCall* nativeCall_before(address return_address) {
197 NativeCall* call = (NativeCall*)(return_address - NativeCall::return_address_offset);
198 #ifdef ASSERT
199 call->verify();
200 #endif
201 return call;
202 }
203
204 // An interface for accessing/manipulating native mov reg, imm instructions.
205 // (used to manipulate inlined 64-bit data calls, etc.)
369 static void test() {}
370
371 // Insertion of native jump instruction
372 static void insert(address code_pos, address entry);
373 // MT-safe insertion of native jump at verified method entry
374 static void check_verified_entry_alignment(address entry, address verified_entry);
375 static void patch_verified_entry(address entry, address verified_entry, address dest);
376 };
377
378 inline NativeJump* nativeJump_at(address address) {
379 NativeJump* jump = (NativeJump*)(address - NativeJump::instruction_offset);
380 #ifdef ASSERT
381 jump->verify();
382 #endif
383 return jump;
384 }
385
386 class NativeGeneralJump: public NativeJump {
387 public:
388 enum AArch64_specific_constants {
389 instruction_size = 4 * 4,
390 instruction_offset = 0,
391 data_offset = 0,
392 next_instruction_offset = 4 * 4
393 };
394 static void insert_unconditional(address code_pos, address entry);
395 static void replace_mt_safe(address instr_addr, address code_buffer);
396 static void verify();
397 };
398
399 inline NativeGeneralJump* nativeGeneralJump_at(address address) {
400 NativeGeneralJump* jump = (NativeGeneralJump*)(address);
401 debug_only(jump->verify();)
402 return jump;
403 }
404
405 class NativePopReg : public NativeInstruction {
406 public:
407 // Insert a pop instruction
408 static void insert(address code_pos, Register reg);
409 };
410
411
412 class NativeIllegalInstruction: public NativeInstruction {
439 uint32_t insn = *(uint32_t*)addr_at(0);
440
441 if (Instruction_aarch64::extract(insn, 30, 26) == 0b00101) {
442 // Unconditional branch (immediate)
443 return true;
444 } else if (Instruction_aarch64::extract(insn, 31, 25) == 0b0101010) {
445 // Conditional branch (immediate)
446 return true;
447 } else if (Instruction_aarch64::extract(insn, 30, 25) == 0b011010) {
448 // Compare & branch (immediate)
449 return true;
450 } else if (Instruction_aarch64::extract(insn, 30, 25) == 0b011011) {
451 // Test & branch (immediate)
452 return true;
453 } else
454 return false;
455 }
456
457 inline bool NativeInstruction::is_jump_or_nop() {
458 return is_nop() || is_jump();
459 }
460
461 // Call trampoline stubs.
462 class NativeCallTrampolineStub : public NativeInstruction {
463 public:
464
465 enum AArch64_specific_constants {
466 instruction_size = 4 * 4,
467 instruction_offset = 0,
468 data_offset = 2 * 4,
469 next_instruction_offset = 4 * 4
470 };
471
472 address destination(nmethod *nm = NULL) const;
473 void set_destination(address new_destination);
474 ptrdiff_t destination_offset() const;
475 };
476
477 inline bool is_NativeCallTrampolineStub_at(address addr) {
478 // Ensure that the stub is exactly
479 // ldr xscratch1, L
480 // br xscratch1
481 // L:
482 uint32_t *i = (uint32_t *)addr;
483 return i[0] == 0x58000048 && i[1] == 0xd61f0100;
484 }
485
486 inline NativeCallTrampolineStub* nativeCallTrampolineStub_at(address addr) {
487 assert(is_NativeCallTrampolineStub_at(addr), "no call trampoline found");
488 return (NativeCallTrampolineStub*)addr;
489 }
490
491 #endif // CPU_AARCH64_VM_NATIVEINST_AARCH64_HPP
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