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1 // Copyright 2006-2008 the V8 project authors. All rights reserved. | |
2 // Redistribution and use in source and binary forms, with or without | |
3 // modification, are permitted provided that the following conditions are | |
4 // met: | |
5 // | |
6 // * Redistributions of source code must retain the above copyright | |
7 // notice, this list of conditions and the following disclaimer. | |
8 // * Redistributions in binary form must reproduce the above | |
9 // copyright notice, this list of conditions and the following | |
10 // disclaimer in the documentation and/or other materials provided | |
11 // with the distribution. | |
12 // * Neither the name of Google Inc. nor the names of its | |
13 // contributors may be used to endorse or promote products derived | |
14 // from this software without specific prior written permission. | |
15 // | |
16 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
17 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
18 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | |
19 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | |
20 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
21 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT | |
22 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
23 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
24 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
25 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
26 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
27 | |
28 #ifndef V8_FRAMES_ARM_H_ | |
29 #define V8_FRAMES_ARM_H_ | |
30 | |
31 namespace v8 { namespace internal { | |
32 | |
33 | |
34 // The ARM ABI does not specify the usage of register r9, which may be reserved | |
35 // as the static base or thread register on some platforms, in which case we | |
36 // leave it alone. Adjust the value of kR9Available accordingly: | |
37 static const int kR9Available = 1; // 1 if available to us, 0 if reserved | |
38 | |
39 | |
40 // Register list in load/store instructions | |
41 // Note that the bit values must match those used in actual instruction encoding | |
42 static const int kNumRegs = 16; | |
43 | |
44 | |
45 // Caller-saved/arguments registers | |
46 static const RegList kJSCallerSaved = | |
47 1 << 0 | // r0 a1 | |
48 1 << 1 | // r1 a2 | |
49 1 << 2 | // r2 a3 | |
50 1 << 3; // r3 a4 | |
51 | |
52 static const int kNumJSCallerSaved = 4; | |
53 | |
54 typedef Object* JSCallerSavedBuffer[kNumJSCallerSaved]; | |
55 | |
56 // Return the code of the n-th caller-saved register available to JavaScript | |
57 // e.g. JSCallerSavedReg(0) returns r0.code() == 0 | |
58 int JSCallerSavedCode(int n); | |
59 | |
60 | |
61 // Callee-saved registers preserved when switching from C to JavaScript | |
62 static const RegList kCalleeSaved = | |
63 1 << 4 | // r4 v1 | |
64 1 << 5 | // r5 v2 | |
65 1 << 6 | // r6 v3 | |
66 1 << 7 | // r7 v4 | |
67 1 << 8 | // r8 v5 (cp in JavaScript code) | |
68 kR9Available | |
69 << 9 | // r9 v6 | |
70 1 << 10 | // r10 v7 (pp in JavaScript code) | |
71 1 << 11; // r11 v8 (fp in JavaScript code) | |
72 | |
73 static const int kNumCalleeSaved = 7 + kR9Available; | |
74 | |
75 | |
76 // ---------------------------------------------------- | |
77 | |
78 | |
79 class StackHandlerConstants : public AllStatic { | |
80 public: | |
81 // TODO(1233780): Get rid of the code slot in stack handlers. | |
82 static const int kCodeOffset = 0 * kPointerSize; | |
83 static const int kNextOffset = 1 * kPointerSize; | |
84 static const int kStateOffset = 2 * kPointerSize; | |
85 static const int kPPOffset = 3 * kPointerSize; | |
86 static const int kFPOffset = 4 * kPointerSize; | |
87 static const int kPCOffset = 5 * kPointerSize; | |
88 | |
89 static const int kAddressDisplacement = -1 * kPointerSize; | |
90 static const int kSize = kPCOffset + kPointerSize; | |
91 }; | |
92 | |
93 | |
94 class EntryFrameConstants : public AllStatic { | |
95 public: | |
96 static const int kCallerFPOffset = -3 * kPointerSize; | |
97 }; | |
98 | |
99 | |
100 class ExitFrameConstants : public AllStatic { | |
101 public: | |
102 // Exit frames have a debug marker on the stack. | |
103 static const int kSPDisplacement = -1 * kPointerSize; | |
104 | |
105 // The debug marker is just above the frame pointer. | |
106 static const int kDebugMarkOffset = -1 * kPointerSize; | |
107 | |
108 static const int kSavedRegistersOffset = 0 * kPointerSize; | |
109 | |
110 // Let the parameters pointer for exit frames point just below the | |
111 // frame structure on the stack. | |
112 static const int kPPDisplacement = 3 * kPointerSize; | |
113 | |
114 // The caller fields are below the frame pointer on the stack. | |
115 static const int kCallerFPOffset = +0 * kPointerSize; | |
116 static const int kCallerPPOffset = +1 * kPointerSize; | |
117 static const int kCallerPCOffset = +2 * kPointerSize; | |
118 }; | |
119 | |
120 | |
121 class StandardFrameConstants : public AllStatic { | |
122 public: | |
123 static const int kExpressionsOffset = -3 * kPointerSize; | |
124 static const int kMarkerOffset = -2 * kPointerSize; | |
125 static const int kContextOffset = -1 * kPointerSize; | |
126 static const int kCallerFPOffset = 0 * kPointerSize; | |
127 static const int kCallerPCOffset = +1 * kPointerSize; | |
128 static const int kCallerSPOffset = +2 * kPointerSize; | |
129 }; | |
130 | |
131 | |
132 class JavaScriptFrameConstants : public AllStatic { | |
133 public: | |
134 // FP-relative. | |
135 static const int kLocal0Offset = StandardFrameConstants::kExpressionsOffset; | |
136 static const int kSavedRegistersOffset = +2 * kPointerSize; | |
137 static const int kFunctionOffset = StandardFrameConstants::kMarkerOffset; | |
138 | |
139 // PP-relative. | |
140 static const int kParam0Offset = -2 * kPointerSize; | |
141 static const int kReceiverOffset = -1 * kPointerSize; | |
142 }; | |
143 | |
144 | |
145 class ArgumentsAdaptorFrameConstants : public AllStatic { | |
146 public: | |
147 static const int kLengthOffset = StandardFrameConstants::kExpressionsOffset; | |
148 }; | |
149 | |
150 | |
151 class InternalFrameConstants : public AllStatic { | |
152 public: | |
153 static const int kCodeOffset = StandardFrameConstants::kExpressionsOffset; | |
154 }; | |
155 | |
156 | |
157 inline Object* JavaScriptFrame::function_slot_object() const { | |
158 const int offset = JavaScriptFrameConstants::kFunctionOffset; | |
159 return Memory::Object_at(fp() + offset); | |
160 } | |
161 | |
162 | |
163 // ---------------------------------------------------- | |
164 | |
165 | |
166 | |
167 | |
168 // lower | Stack | | |
169 // addresses | ^ | | |
170 // | | | | |
171 // | | | |
172 // | JS frame | | |
173 // | | | |
174 // | | | |
175 // ----------- +=============+ <--- sp (stack pointer) | |
176 // | function | | |
177 // +-------------+ | |
178 // +-------------+ | |
179 // | | | |
180 // | expressions | | |
181 // | | | |
182 // +-------------+ | |
183 // | | | |
184 // a | locals | | |
185 // c | | | |
186 // t +- - - - - - -+ <--- | |
187 // i -4 | local0 | ^ | |
188 // v +-------------+ | | |
189 // a -3 | code | | | |
190 // t +-------------+ | kLocal0Offset | |
191 // i -2 | context | | | |
192 // o +-------------+ | | |
193 // n -1 | args_length | v | |
194 // +-------------+ <--- fp (frame pointer) | |
195 // 0 | caller_pp | | |
196 // f +-------------+ | |
197 // r 1 | caller_fp | | |
198 // a +-------------+ | |
199 // m 2 | sp_on_exit | (pp if return, caller_sp if no return) | |
200 // e +-------------+ | |
201 // 3 | caller_pc | | |
202 // +-------------+ <--- caller_sp (incl. parameters) | |
203 // | | | |
204 // | parameters | | |
205 // | | | |
206 // +- - - - - - -+ <--- | |
207 // -2 | parameter0 | ^ | |
208 // +-------------+ | kParam0Offset | |
209 // -1 | receiver | v | |
210 // ----------- +=============+ <--- pp (parameter pointer, r10) | |
211 // 0 | function | | |
212 // +-------------+ | |
213 // | | | |
214 // |caller-saved | (must be valid JS values, traversed during GC) | |
215 // | regs | | |
216 // | | | |
217 // +-------------+ | |
218 // | | | |
219 // | caller | | |
220 // higher | expressions | | |
221 // addresses | | | |
222 // | | | |
223 // | JS frame | | |
224 | |
225 | |
226 | |
227 // Handler frames (part of expressions of JS frames): | |
228 | |
229 // lower | Stack | | |
230 // addresses | ^ | | |
231 // | | | | |
232 // | | | |
233 // h | expressions | | |
234 // a | | | |
235 // n +-------------+ | |
236 // d -1 | code | | |
237 // l +-------------+ <--- handler sp | |
238 // e 0 | next_sp | link to next handler (next handler's sp) | |
239 // r +-------------+ | |
240 // 1 | state | | |
241 // f +-------------+ | |
242 // r 2 | pp | | |
243 // a +-------------+ | |
244 // m 3 | fp | | |
245 // e +-------------+ | |
246 // 4 | pc | | |
247 // +-------------+ | |
248 // | | | |
249 // higher | expressions | | |
250 // addresses | | | |
251 | |
252 | |
253 | |
254 // JS entry frames: When calling from C to JS, we construct two extra | |
255 // frames: An entry frame (C) and a trampoline frame (JS). The | |
256 // following pictures shows the two frames: | |
257 | |
258 // lower | Stack | | |
259 // addresses | ^ | | |
260 // | | | | |
261 // | | | |
262 // | JS frame | | |
263 // | | | |
264 // | | | |
265 // ----------- +=============+ <--- sp (stack pointer) | |
266 // | | | |
267 // | parameters | | |
268 // t | | | |
269 // r +- - - - - - -+ | |
270 // a | parameter0 | | |
271 // m +-------------+ | |
272 // p | receiver | | |
273 // o +-------------+ | |
274 // l | function | | |
275 // i +-------------+ | |
276 // n -3 | code | | |
277 // e +-------------+ | |
278 // -2 | NULL | context is always NULL | |
279 // +-------------+ | |
280 // f -1 | 0 | args_length is always zero | |
281 // r +-------------+ <--- fp (frame pointer) | |
282 // a 0 | NULL | caller pp is always NULL for entries | |
283 // m +-------------+ | |
284 // e 1 | caller_fp | | |
285 // +-------------+ | |
286 // 2 | sp_on_exit | (caller_sp) | |
287 // +-------------+ | |
288 // 3 | caller_pc | | |
289 // ----------- +=============+ <--- caller_sp == pp | |
290 // . ^ | |
291 // . | try-handler, fake, not GC'ed | |
292 // . v | |
293 // +-------------+ <--- | |
294 // -2 | next top pp | | |
295 // +-------------+ | |
296 // -1 | next top fp | | |
297 // +-------------+ <--- fp | |
298 // | r4 | r4-r9 holding non-JS values must be preserved | |
299 // +-------------+ | |
300 // J | r5 | before being initialized not to confuse GC | |
301 // S +-------------+ | |
302 // | r6 | | |
303 // +-------------+ | |
304 // e | r7 | | |
305 // n +-------------+ | |
306 // t | r8 | | |
307 // r +-------------+ | |
308 // y [ | r9 | ] only if r9 available | |
309 // +-------------+ | |
310 // | r10 | | |
311 // f +-------------+ | |
312 // r | r11 | | |
313 // a +-------------+ | |
314 // m | caller_sp | | |
315 // e +-------------+ | |
316 // | caller_pc | | |
317 // +-------------+ <--- caller_sp | |
318 // | argv | passed on stack from C code | |
319 // +-------------+ | |
320 // | | | |
321 // higher | | | |
322 // addresses | C frame | | |
323 | |
324 | |
325 // The first 4 args are passed from C in r0-r3 and are not spilled on entry: | |
326 // r0: code entry | |
327 // r1: function | |
328 // r2: receiver | |
329 // r3: argc | |
330 // [sp+0]: argv | |
331 | |
332 | |
333 // C entry frames: When calling from JS to C, we construct one extra | |
334 // frame: | |
335 | |
336 // lower | Stack | | |
337 // addresses | ^ | | |
338 // | | | | |
339 // | | | |
340 // | C frame | | |
341 // | | | |
342 // | | | |
343 // ----------- +=============+ <--- sp (stack pointer) | |
344 // | | | |
345 // | parameters | (first 4 args are passed in r0-r3) | |
346 // | | | |
347 // +-------------+ <--- fp (frame pointer) | |
348 // f 4/5 | caller_fp | | |
349 // r +-------------+ | |
350 // a 5/6 | sp_on_exit | (pp) | |
351 // m +-------------+ | |
352 // e 6/7 | caller_pc | | |
353 // +-------------+ <--- caller_sp (incl. parameters) | |
354 // 7/8 | | | |
355 // | parameters | | |
356 // | | | |
357 // +- - - - - - -+ <--- | |
358 // -2 | parameter0 | ^ | |
359 // +-------------+ | kParam0Offset | |
360 // -1 | receiver | v | |
361 // ----------- +=============+ <--- pp (parameter pointer, r10) | |
362 // 0 | function | | |
363 // +-------------+ | |
364 // | | | |
365 // |caller-saved | | |
366 // | regs | | |
367 // | | | |
368 // +-------------+ | |
369 // | | | |
370 // | caller | | |
371 // | expressions | | |
372 // | | | |
373 // higher | | | |
374 // addresses | JS frame | | |
375 | |
376 | |
377 } } // namespace v8::internal | |
378 | |
379 #endif // V8_FRAMES_ARM_H_ | |
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