Repository navigation
Expand file tree
/
Copy pathA64DOpcode.cpp
More file actions
326 lines (279 loc) · 10.4 KB
/
Copy pathA64DOpcode.cpp
File metadata and controls
326 lines (279 loc) · 10.4 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
/*
* Copyright (C) 2012-2025 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#if ENABLE(ARM64_DISASSEMBLER)
#include "A64DOpcode.h"
#include "Binja.h"
#include "Disassembler.h"
#include "ExecutableAllocator.h"
#include "Integrity.h"
#include "LLIntPCRanges.h"
#include "VM.h"
#include "VMManager.h"
#include <array>
#include <stdarg.h>
#include <stdint.h>
#include <stdio.h>
#include <wtf/PtrTag.h>
#include <wtf/Range.h>
WTF_ALLOW_UNSAFE_BUFFER_USAGE_BEGIN
namespace JSC { namespace ARM64Disassembler {
const char* A64DOpcode::disassemble(uint32_t* currentPC)
{
m_currentPC = currentPC;
m_bufferOffset = 0;
m_formatBuffer[0] = '\0';
{
std::array<char, 256> buffer;
arm64Disassemble(currentPC, buffer.data(), buffer.size());
bufferPrintf(" %s", buffer.data());
}
// Get instruction info for metadata analysis
ARM64InstructionInfo info;
if (!arm64GetInstructionInfo(*currentPC, (uint64_t)currentPC, &info))
return m_formatBuffer;
// Apply JSC-specific metadata based on instruction category
switch (info.category) {
case ARM64_CATEGORY_BRANCH_UNCONDITIONAL:
case ARM64_CATEGORY_BRANCH_CONDITIONAL:
case ARM64_CATEGORY_BRANCH_COMPARE:
case ARM64_CATEGORY_BRANCH_TEST:
// For branches, immediate is the byte offset from PC
appendPCRelativeOffset(currentPC, static_cast<int32_t>(info.immediate / 4));
break;
case ARM64_CATEGORY_ADR:
case ARM64_CATEGORY_ADRP:
appendPCRelativeOffset(currentPC, static_cast<int32_t>(info.immediate / 4));
break;
case ARM64_CATEGORY_MOVZ:
case ARM64_CATEGORY_MOVN:
case ARM64_CATEGORY_MOVK:
case ARM64_CATEGORY_MOV:
trackMoveWideConstant(info.category, info.immediate, info.shiftAmount, info.destRegister, info.is64Bit);
maybeAnnotateBuiltConstant();
break;
default:
// Reset MoveWide tracking if this is a different instruction
// that uses a different destination register
if (info.destRegister != m_moveWideDestReg)
m_moveWideDestReg = 255;
break;
}
return m_formatBuffer;
}
void A64DOpcode::bufferPrintf(const char* format, ...)
{
if (m_bufferOffset >= bufferSize)
return;
va_list argList;
va_start(argList, format);
m_bufferOffset += vsnprintf(m_formatBuffer + m_bufferOffset, bufferSize - m_bufferOffset, format, argList);
va_end(argList);
}
void A64DOpcode::appendPCRelativeOffset(uint32_t* pc, int32_t immediate)
{
uint32_t* targetPC = pc + immediate;
constexpr size_t localBufferSize = 101;
char buffer[localBufferSize];
const char* targetInfo = buffer;
if (!m_startPC)
return;
if (targetPC >= m_startPC && targetPC < m_endPC)
snprintf(buffer, localBufferSize - 1, " -> <%u>", static_cast<unsigned>((targetPC - m_startPC) * sizeof(uint32_t)));
else if (const char* label = labelFor(targetPC))
snprintf(buffer, localBufferSize - 1, " -> %s", label);
else if (isJITPC(targetPC))
targetInfo = " -> JIT PC";
else if (LLInt::isLLIntPC(targetPC))
targetInfo = " -> LLInt PC";
else
targetInfo = " -> <unknown>";
bufferPrintf("%s", targetInfo);
}
void A64DOpcode::trackMoveWideConstant(int category, int64_t immediate, uint8_t shiftAmount, uint8_t destRegister, uint8_t is64Bit)
{
UNUSED_PARAM(is64Bit);
switch (category) {
case ARM64_CATEGORY_MOVZ:
case ARM64_CATEGORY_MOV: {
m_builtConstant = static_cast<uint64_t>(immediate) << shiftAmount;
m_moveWideDestReg = destRegister;
break;
}
case ARM64_CATEGORY_MOVN: {
m_builtConstant = ~(static_cast<uint64_t>(immediate) << shiftAmount);
m_moveWideDestReg = destRegister;
break;
}
case ARM64_CATEGORY_MOVK: {
if (destRegister == m_moveWideDestReg) {
uint64_t mask = ~(static_cast<uint64_t>(0xFFFF) << shiftAmount);
m_builtConstant = (m_builtConstant & mask) | (static_cast<uint64_t>(immediate) << shiftAmount);
break;
}
m_builtConstant = 0;
m_moveWideDestReg = 255;
break;
}
default:
RELEASE_ASSERT_NOT_REACHED();
break;
}
}
void A64DOpcode::maybeAnnotateBuiltConstant()
{
if (!m_startPC)
return;
// Check if the next instruction continues building the constant
uint32_t* nextPC = m_currentPC + 1;
if (nextPC < m_endPC) {
ARM64InstructionInfo nextInfo;
if (arm64GetInstructionInfo(*nextPC, (uint64_t)nextPC, &nextInfo)) {
// If next instruction is MOVK with same dest register, don't annotate yet
if (nextInfo.category == ARM64_CATEGORY_MOVK && nextInfo.destRegister == m_moveWideDestReg)
return;
}
}
uint64_t constant = m_builtConstant;
m_builtConstant = 0;
m_moveWideDestReg = 255;
// Done building constant - annotate it
void* ptr = removeCodePtrTag(std::bit_cast<void*>(constant));
if (!ptr)
return;
if (Integrity::isSanePointer(ptr)) {
bufferPrintf(" -> %p", std::bit_cast<void*>(constant));
if (const char* label = labelFor(ptr)) {
bufferPrintf(" %s", label);
return;
}
if (isJITPC(ptr)) {
bufferPrintf(" JIT PC");
return;
}
if (LLInt::isLLIntPC(ptr)) {
bufferPrintf(" LLInt PC");
return;
}
handlePotentialDataPointer(ptr);
return;
}
#if CPU(ARM64E)
if (handlePotentialPtrTag(constant))
return;
#endif
if (constant < 0x10000)
bufferPrintf(" -> %u", static_cast<unsigned>(constant));
else
bufferPrintf(" -> %p", std::bit_cast<void*>(constant));
}
bool A64DOpcode::handlePotentialDataPointer(void* ptr)
{
ASSERT(Integrity::isSanePointer(ptr));
bool handled = false;
VMManager::forEachVM([&] (VM& vm) {
if (ptr == &vm) {
bufferPrintf(" vm");
handled = true;
return IterationStatus::Done;
}
if (!vm.isInService())
return IterationStatus::Continue;
auto* vmStart = reinterpret_cast<uint8_t*>(&vm);
auto* vmEnd = vmStart + sizeof(VM);
auto* u8Ptr = reinterpret_cast<uint8_t*>(ptr);
Range vmRange(vmStart, vmEnd);
if (vmRange.contains(u8Ptr)) {
unsigned offset = u8Ptr - vmStart;
bufferPrintf(" vm +%u", offset);
const char* description = nullptr;
if (ptr == &vm.topCallFrame)
description = "vm.topCallFrame";
else if (offset == VM::topEntryFrameOffset())
description = "vm.topEntryFrame";
else if (offset == VM::exceptionOffset())
description = "vm.m_exception";
else if (offset == VM::offsetOfHeapBarrierThreshold())
description = "vm.heap.m_barrierThreshold";
else if (offset == VM::callFrameForCatchOffset())
description = "vm.callFrameForCatch";
else if (ptr == vm.addressOfSoftStackLimit())
description = "vm.softStackLimit()";
else if (ptr == &vm.osrExitIndex)
description = "vm.osrExitIndex";
else if (ptr == &vm.osrExitReturnPC)
description = "vm.osrExitReturnPC";
else if (ptr == &vm.osrExitJumpDestination)
description = "vm.osrExitJumpDestination";
else if (ptr == vm.smallStrings.singleCharacterStrings())
description = "vm.smallStrings.m_singleCharacterStrings";
else if (ptr == &vm.targetMachinePCForThrow)
description = "vm.targetMachinePCForThrow";
else if (ptr == vm.traps().trapBitsAddress())
description = "vm.m_traps.m_trapBits";
#if ENABLE(DFG_DOES_GC_VALIDATION)
else if (ptr == vm.addressOfDoesGC())
description = "vm.m_doesGC";
#endif
if (description)
bufferPrintf(": %s", description);
handled = true;
return IterationStatus::Done;
}
if (vm.isScratchBuffer(ptr)) {
bufferPrintf(" vm scratchBuffer.m_buffer");
handled = true;
return IterationStatus::Done;
}
return IterationStatus::Continue;
});
return handled;
}
#if CPU(ARM64E)
bool A64DOpcode::handlePotentialPtrTag(uintptr_t value)
{
if (!value || value > 0xffff)
return false;
PtrTag tag = static_cast<PtrTag>(value);
#if ENABLE(PTRTAG_DEBUGGING)
const char* name = WTF::ptrTagName(tag);
if (name[0] == '<')
return false; // Only result that starts with '<' is "<unknown>".
#else
// Without ENABLE(PTRTAG_DEBUGGING), not all PtrTags are registered for
// printing. So, we'll just do the minimum with only the JSC specific tags.
const char* name = ptrTagName(tag);
if (!name)
return false;
#endif
// Also print '?' to indicate that this is a maybe. We do not know for certain
// if the constant is meant to be used as a PtrTag.
bufferPrintf(" -> %p %s ?", reinterpret_cast<void*>(value), name);
return true;
}
#endif
} } // namespace JSC::ARM64Disassembler
WTF_ALLOW_UNSAFE_BUFFER_USAGE_END
#endif // ENABLE(ARM64_DISASSEMBLER)