1 //===-- RegisterContextMinidump_ARM.cpp -----------------------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 
9 #include "RegisterContextMinidump_ARM.h"
10 
11 #include "Utility/ARM_DWARF_Registers.h"
12 #include "Utility/ARM_ehframe_Registers.h"
13 #include "lldb/Utility/RegisterValue.h"
14 #include "lldb/Utility/DataExtractor.h"
15 #include "lldb/Utility/LLDBAssert.h"
16 #include "lldb/lldb-enumerations.h"
17 
18 // C includes
19 #include <assert.h>
20 
21 // C++ includes
22 
23 using namespace lldb;
24 using namespace lldb_private;
25 using namespace minidump;
26 
27 #define INV LLDB_INVALID_REGNUM
28 #define OFFSET(r) (offsetof(RegisterContextMinidump_ARM::Context, r))
29 
30 #define DEF_R(i)                                                               \
31   {                                                                            \
32     "r" #i, nullptr, 4, OFFSET(r) + i * 4, eEncodingUint, eFormatHex,          \
33         {ehframe_r##i, dwarf_r##i, INV, INV, reg_r##i},                          \
34         nullptr, nullptr, nullptr, 0    \
35   }
36 
37 #define DEF_R_ARG(i, n)                                                        \
38   {                                                                            \
39     "r" #i, "arg" #n, 4, OFFSET(r) + i * 4, eEncodingUint, eFormatHex,         \
40         {ehframe_r##i, dwarf_r##i, LLDB_REGNUM_GENERIC_ARG1 + i, INV, reg_r##i}, \
41         nullptr, nullptr, nullptr, 0                                           \
42   }
43 
44 #define DEF_D(i)                                                               \
45   {                                                                            \
46     "d" #i, nullptr, 8, OFFSET(d) + i * 8, eEncodingVector,                    \
47         eFormatVectorOfUInt8, {dwarf_d##i, dwarf_d##i, INV, INV, reg_d##i},    \
48         nullptr, nullptr, nullptr, 0    \
49   }
50 
51 #define DEF_S(i)                                                               \
52   {                                                                            \
53     "s" #i, nullptr, 4, OFFSET(s) + i * 4, eEncodingIEEE754, eFormatFloat,     \
54         {dwarf_s##i, dwarf_s##i, INV, INV, reg_s##i},                          \
55         nullptr, nullptr, nullptr, 0                                           \
56   }
57 
58 #define DEF_Q(i)                                                               \
59   {                                                                            \
60     "q" #i, nullptr, 16, OFFSET(q) + i * 16, eEncodingVector,                  \
61         eFormatVectorOfUInt8, {dwarf_q##i, dwarf_q##i, INV, INV, reg_q##i},    \
62         nullptr, nullptr, nullptr, 0    \
63   }
64 
65 // Zero based LLDB register numbers for this register context
66 enum {
67   // General Purpose Registers
68   reg_r0,
69   reg_r1,
70   reg_r2,
71   reg_r3,
72   reg_r4,
73   reg_r5,
74   reg_r6,
75   reg_r7,
76   reg_r8,
77   reg_r9,
78   reg_r10,
79   reg_r11,
80   reg_r12,
81   reg_sp,
82   reg_lr,
83   reg_pc,
84   reg_cpsr,
85   // Floating Point Registers
86   reg_fpscr,
87   reg_d0,
88   reg_d1,
89   reg_d2,
90   reg_d3,
91   reg_d4,
92   reg_d5,
93   reg_d6,
94   reg_d7,
95   reg_d8,
96   reg_d9,
97   reg_d10,
98   reg_d11,
99   reg_d12,
100   reg_d13,
101   reg_d14,
102   reg_d15,
103   reg_d16,
104   reg_d17,
105   reg_d18,
106   reg_d19,
107   reg_d20,
108   reg_d21,
109   reg_d22,
110   reg_d23,
111   reg_d24,
112   reg_d25,
113   reg_d26,
114   reg_d27,
115   reg_d28,
116   reg_d29,
117   reg_d30,
118   reg_d31,
119   reg_s0,
120   reg_s1,
121   reg_s2,
122   reg_s3,
123   reg_s4,
124   reg_s5,
125   reg_s6,
126   reg_s7,
127   reg_s8,
128   reg_s9,
129   reg_s10,
130   reg_s11,
131   reg_s12,
132   reg_s13,
133   reg_s14,
134   reg_s15,
135   reg_s16,
136   reg_s17,
137   reg_s18,
138   reg_s19,
139   reg_s20,
140   reg_s21,
141   reg_s22,
142   reg_s23,
143   reg_s24,
144   reg_s25,
145   reg_s26,
146   reg_s27,
147   reg_s28,
148   reg_s29,
149   reg_s30,
150   reg_s31,
151   reg_q0,
152   reg_q1,
153   reg_q2,
154   reg_q3,
155   reg_q4,
156   reg_q5,
157   reg_q6,
158   reg_q7,
159   reg_q8,
160   reg_q9,
161   reg_q10,
162   reg_q11,
163   reg_q12,
164   reg_q13,
165   reg_q14,
166   reg_q15,
167   k_num_regs
168 };
169 
170 static RegisterInfo g_reg_info_apple_fp = {
171     "fp",
172     "r7",
173     4,
174     OFFSET(r) + 7 * 4,
175     eEncodingUint,
176     eFormatHex,
177     {ehframe_r7, dwarf_r7, LLDB_REGNUM_GENERIC_FP, INV, reg_r7},
178     nullptr,
179     nullptr,
180     nullptr,
181     0};
182 
183 static RegisterInfo g_reg_info_fp = {
184     "fp",
185     "r11",
186     4,
187     OFFSET(r) + 11 * 4,
188     eEncodingUint,
189     eFormatHex,
190     {ehframe_r11, dwarf_r11, LLDB_REGNUM_GENERIC_FP, INV, reg_r11},
191     nullptr,
192     nullptr,
193     nullptr,
194     0};
195 
196 // Register info definitions for this register context
197 static RegisterInfo g_reg_infos[] = {
198     DEF_R_ARG(0, 1),
199     DEF_R_ARG(1, 2),
200     DEF_R_ARG(2, 3),
201     DEF_R_ARG(3, 4),
202     DEF_R(4),
203     DEF_R(5),
204     DEF_R(6),
205     DEF_R(7),
206     DEF_R(8),
207     DEF_R(9),
208     DEF_R(10),
209     DEF_R(11),
210     DEF_R(12),
211     {"sp",
212      "r13",
213      4,
214      OFFSET(r) + 13 * 4,
215      eEncodingUint,
216      eFormatHex,
217      {ehframe_sp, dwarf_sp, LLDB_REGNUM_GENERIC_SP, INV, reg_sp},
218      nullptr,
219      nullptr,
220      nullptr,
221      0},
222     {"lr",
223      "r14",
224      4,
225      OFFSET(r) + 14 * 4,
226      eEncodingUint,
227      eFormatHex,
228      {ehframe_lr, dwarf_lr, LLDB_REGNUM_GENERIC_RA, INV, reg_lr},
229      nullptr,
230      nullptr,
231      nullptr,
232      0},
233     {"pc",
234      "r15",
235      4,
236      OFFSET(r) + 15 * 4,
237      eEncodingUint,
238      eFormatHex,
239      {ehframe_pc, dwarf_pc, LLDB_REGNUM_GENERIC_PC, INV, reg_pc},
240      nullptr,
241      nullptr,
242      nullptr,
243      0},
244     {"cpsr",
245      "psr",
246      4,
247      OFFSET(cpsr),
248      eEncodingUint,
249      eFormatHex,
250      {ehframe_cpsr, dwarf_cpsr, LLDB_REGNUM_GENERIC_FLAGS, INV, reg_cpsr},
251      nullptr,
252      nullptr,
253      nullptr,
254      0},
255     {"fpscr",
256      nullptr,
257      8,
258      OFFSET(fpscr),
259      eEncodingUint,
260      eFormatHex,
261      {INV, INV, INV, INV, reg_fpscr},
262      nullptr,
263      nullptr,
264      nullptr,
265      0},
266     DEF_D(0),
267     DEF_D(1),
268     DEF_D(2),
269     DEF_D(3),
270     DEF_D(4),
271     DEF_D(5),
272     DEF_D(6),
273     DEF_D(7),
274     DEF_D(8),
275     DEF_D(9),
276     DEF_D(10),
277     DEF_D(11),
278     DEF_D(12),
279     DEF_D(13),
280     DEF_D(14),
281     DEF_D(15),
282     DEF_D(16),
283     DEF_D(17),
284     DEF_D(18),
285     DEF_D(19),
286     DEF_D(20),
287     DEF_D(21),
288     DEF_D(22),
289     DEF_D(23),
290     DEF_D(24),
291     DEF_D(25),
292     DEF_D(26),
293     DEF_D(27),
294     DEF_D(28),
295     DEF_D(29),
296     DEF_D(30),
297     DEF_D(31),
298     DEF_S(0),
299     DEF_S(1),
300     DEF_S(2),
301     DEF_S(3),
302     DEF_S(4),
303     DEF_S(5),
304     DEF_S(6),
305     DEF_S(7),
306     DEF_S(8),
307     DEF_S(9),
308     DEF_S(10),
309     DEF_S(11),
310     DEF_S(12),
311     DEF_S(13),
312     DEF_S(14),
313     DEF_S(15),
314     DEF_S(16),
315     DEF_S(17),
316     DEF_S(18),
317     DEF_S(19),
318     DEF_S(20),
319     DEF_S(21),
320     DEF_S(22),
321     DEF_S(23),
322     DEF_S(24),
323     DEF_S(25),
324     DEF_S(26),
325     DEF_S(27),
326     DEF_S(28),
327     DEF_S(29),
328     DEF_S(30),
329     DEF_S(31),
330     DEF_Q(0),
331     DEF_Q(1),
332     DEF_Q(2),
333     DEF_Q(3),
334     DEF_Q(4),
335     DEF_Q(5),
336     DEF_Q(6),
337     DEF_Q(7),
338     DEF_Q(8),
339     DEF_Q(9),
340     DEF_Q(10),
341     DEF_Q(11),
342     DEF_Q(12),
343     DEF_Q(13),
344     DEF_Q(14),
345     DEF_Q(15)};
346 
347 constexpr size_t k_num_reg_infos = llvm::array_lengthof(g_reg_infos);
348 
349 // ARM general purpose registers.
350 const uint32_t g_gpr_regnums[] = {
351     reg_r0,
352     reg_r1,
353     reg_r2,
354     reg_r3,
355     reg_r4,
356     reg_r5,
357     reg_r6,
358     reg_r7,
359     reg_r8,
360     reg_r9,
361     reg_r10,
362     reg_r11,
363     reg_r12,
364     reg_sp,
365     reg_lr,
366     reg_pc,
367     reg_cpsr,
368     LLDB_INVALID_REGNUM // register sets need to end with this flag
369 };
370 const uint32_t g_fpu_regnums[] = {
371     reg_fpscr,
372     reg_d0,
373     reg_d1,
374     reg_d2,
375     reg_d3,
376     reg_d4,
377     reg_d5,
378     reg_d6,
379     reg_d7,
380     reg_d8,
381     reg_d9,
382     reg_d10,
383     reg_d11,
384     reg_d12,
385     reg_d13,
386     reg_d14,
387     reg_d15,
388     reg_d16,
389     reg_d17,
390     reg_d18,
391     reg_d19,
392     reg_d20,
393     reg_d21,
394     reg_d22,
395     reg_d23,
396     reg_d24,
397     reg_d25,
398     reg_d26,
399     reg_d27,
400     reg_d28,
401     reg_d29,
402     reg_d30,
403     reg_d31,
404     reg_s0,
405     reg_s1,
406     reg_s2,
407     reg_s3,
408     reg_s4,
409     reg_s5,
410     reg_s6,
411     reg_s7,
412     reg_s8,
413     reg_s9,
414     reg_s10,
415     reg_s11,
416     reg_s12,
417     reg_s13,
418     reg_s14,
419     reg_s15,
420     reg_s16,
421     reg_s17,
422     reg_s18,
423     reg_s19,
424     reg_s20,
425     reg_s21,
426     reg_s22,
427     reg_s23,
428     reg_s24,
429     reg_s25,
430     reg_s26,
431     reg_s27,
432     reg_s28,
433     reg_s29,
434     reg_s30,
435     reg_s31,
436     reg_q0,
437     reg_q1,
438     reg_q2,
439     reg_q3,
440     reg_q4,
441     reg_q5,
442     reg_q6,
443     reg_q7,
444     reg_q8,
445     reg_q9,
446     reg_q10,
447     reg_q11,
448     reg_q12,
449     reg_q13,
450     reg_q14,
451     reg_q15,
452     LLDB_INVALID_REGNUM // register sets need to end with this flag
453 };
454 
455 // Skip the last LLDB_INVALID_REGNUM in each count below by subtracting 1
456 constexpr size_t k_num_gpr_regs = llvm::array_lengthof(g_gpr_regnums) - 1;
457 constexpr size_t k_num_fpu_regs = llvm::array_lengthof(g_fpu_regnums) - 1;
458 
459 static RegisterSet g_reg_sets[] = {
460     {"General Purpose Registers", "gpr", k_num_gpr_regs, g_gpr_regnums},
461     {"Floating Point Registers", "fpu", k_num_fpu_regs, g_fpu_regnums},
462 };
463 
464 constexpr size_t k_num_reg_sets = llvm::array_lengthof(g_reg_sets);
465 
RegisterContextMinidump_ARM(lldb_private::Thread & thread,const DataExtractor & data,bool apple)466 RegisterContextMinidump_ARM::RegisterContextMinidump_ARM(
467     lldb_private::Thread &thread, const DataExtractor &data, bool apple)
468     : RegisterContext(thread, 0), m_apple(apple) {
469   lldb::offset_t offset = 0;
470   m_regs.context_flags = data.GetU32(&offset);
471   for (unsigned i = 0; i < llvm::array_lengthof(m_regs.r); ++i)
472     m_regs.r[i] = data.GetU32(&offset);
473   m_regs.cpsr = data.GetU32(&offset);
474   m_regs.fpscr = data.GetU64(&offset);
475   for (unsigned i = 0; i < llvm::array_lengthof(m_regs.d); ++i)
476     m_regs.d[i] = data.GetU64(&offset);
477   lldbassert(k_num_regs == k_num_reg_infos);
478 }
479 
GetRegisterCountStatic()480 size_t RegisterContextMinidump_ARM::GetRegisterCountStatic() {
481   return k_num_regs;
482 }
483 
484 // Used for unit testing so we can verify register info is filled in for
485 // all register flavors (DWARF, EH Frame, generic, etc).
GetRegisterCount()486 size_t RegisterContextMinidump_ARM::GetRegisterCount() {
487   return GetRegisterCountStatic();
488 }
489 
490 // Used for unit testing so we can verify register info is filled in.
491 const RegisterInfo *
GetRegisterInfoAtIndexStatic(size_t reg,bool apple)492 RegisterContextMinidump_ARM::GetRegisterInfoAtIndexStatic(size_t reg,
493                                                           bool apple) {
494   if (reg < k_num_reg_infos) {
495     if (apple) {
496       if (reg == reg_r7)
497         return &g_reg_info_apple_fp;
498     } else {
499       if (reg == reg_r11)
500         return &g_reg_info_fp;
501     }
502     return &g_reg_infos[reg];
503   }
504   return nullptr;
505 }
506 
507 const RegisterInfo *
GetRegisterInfoAtIndex(size_t reg)508 RegisterContextMinidump_ARM::GetRegisterInfoAtIndex(size_t reg) {
509   return GetRegisterInfoAtIndexStatic(reg, m_apple);
510 }
511 
GetRegisterSetCount()512 size_t RegisterContextMinidump_ARM::GetRegisterSetCount() {
513   return k_num_reg_sets;
514 }
515 
GetRegisterSet(size_t set)516 const RegisterSet *RegisterContextMinidump_ARM::GetRegisterSet(size_t set) {
517   if (set < k_num_reg_sets)
518     return &g_reg_sets[set];
519   return nullptr;
520 }
521 
GetRegisterName(unsigned reg)522 const char *RegisterContextMinidump_ARM::GetRegisterName(unsigned reg) {
523   if (reg < k_num_reg_infos)
524     return g_reg_infos[reg].name;
525   return nullptr;
526 }
527 
ReadRegister(const RegisterInfo * reg_info,RegisterValue & reg_value)528 bool RegisterContextMinidump_ARM::ReadRegister(const RegisterInfo *reg_info,
529                                                RegisterValue &reg_value) {
530   Status error;
531   reg_value.SetFromMemoryData(
532       reg_info, (const uint8_t *)&m_regs + reg_info->byte_offset,
533       reg_info->byte_size, lldb::eByteOrderLittle, error);
534   return error.Success();
535 }
536 
WriteRegister(const RegisterInfo *,const RegisterValue &)537 bool RegisterContextMinidump_ARM::WriteRegister(const RegisterInfo *,
538                                                 const RegisterValue &) {
539   return false;
540 }
541 
ConvertRegisterKindToRegisterNumber(lldb::RegisterKind kind,uint32_t num)542 uint32_t RegisterContextMinidump_ARM::ConvertRegisterKindToRegisterNumber(
543     lldb::RegisterKind kind, uint32_t num) {
544   for (size_t i = 0; i < k_num_regs; ++i) {
545     if (g_reg_infos[i].kinds[kind] == num)
546       return i;
547   }
548   return LLDB_INVALID_REGNUM;
549 }
550