RegisterContextPOSIX_powerpc.cpp revision 288943 
1//===-- RegisterContextPOSIX_powerpc.cpp -------------------------*- C++ -*-===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9
10#include <cstring>
11#include <errno.h>
12#include <stdint.h>
13
14#include "lldb/Core/DataBufferHeap.h"
15#include "lldb/Core/DataExtractor.h"
16#include "lldb/Core/RegisterValue.h"
17#include "lldb/Core/Scalar.h"
18#include "lldb/Target/Target.h"
19#include "lldb/Target/Thread.h"
20#include "lldb/Host/Endian.h"
21#include "llvm/Support/Compiler.h"
22
23#include "RegisterContextPOSIX_powerpc.h"
24#include "Plugins/Process/elf-core/ProcessElfCore.h"
25
26using namespace lldb_private;
27using namespace lldb;
28
29static const
30uint32_t g_gpr_regnums[] =
31{
32    gpr_r0_powerpc,
33    gpr_r1_powerpc,
34    gpr_r2_powerpc,
35    gpr_r3_powerpc,
36    gpr_r4_powerpc,
37    gpr_r5_powerpc,
38    gpr_r6_powerpc,
39    gpr_r7_powerpc,
40    gpr_r8_powerpc,
41    gpr_r9_powerpc,
42    gpr_r10_powerpc,
43    gpr_r11_powerpc,
44    gpr_r12_powerpc,
45    gpr_r13_powerpc,
46    gpr_r14_powerpc,
47    gpr_r15_powerpc,
48    gpr_r16_powerpc,
49    gpr_r17_powerpc,
50    gpr_r18_powerpc,
51    gpr_r19_powerpc,
52    gpr_r20_powerpc,
53    gpr_r21_powerpc,
54    gpr_r22_powerpc,
55    gpr_r23_powerpc,
56    gpr_r24_powerpc,
57    gpr_r25_powerpc,
58    gpr_r26_powerpc,
59    gpr_r27_powerpc,
60    gpr_r28_powerpc,
61    gpr_r29_powerpc,
62    gpr_r30_powerpc,
63    gpr_r31_powerpc,
64    gpr_lr_powerpc,
65    gpr_cr_powerpc,
66    gpr_xer_powerpc,
67    gpr_ctr_powerpc,
68    gpr_pc_powerpc,
69};
70
71static const
72uint32_t g_fpr_regnums[] =
73{
74    fpr_f0_powerpc,
75    fpr_f1_powerpc,
76    fpr_f2_powerpc,
77    fpr_f3_powerpc,
78    fpr_f4_powerpc,
79    fpr_f5_powerpc,
80    fpr_f6_powerpc,
81    fpr_f7_powerpc,
82    fpr_f8_powerpc,
83    fpr_f9_powerpc,
84    fpr_f10_powerpc,
85    fpr_f11_powerpc,
86    fpr_f12_powerpc,
87    fpr_f13_powerpc,
88    fpr_f14_powerpc,
89    fpr_f15_powerpc,
90    fpr_f16_powerpc,
91    fpr_f17_powerpc,
92    fpr_f18_powerpc,
93    fpr_f19_powerpc,
94    fpr_f20_powerpc,
95    fpr_f21_powerpc,
96    fpr_f22_powerpc,
97    fpr_f23_powerpc,
98    fpr_f24_powerpc,
99    fpr_f25_powerpc,
100    fpr_f26_powerpc,
101    fpr_f27_powerpc,
102    fpr_f28_powerpc,
103    fpr_f29_powerpc,
104    fpr_f30_powerpc,
105    fpr_f31_powerpc,
106    fpr_fpscr_powerpc,
107};
108
109static const
110uint32_t g_vmx_regnums[] =
111{
112    vmx_v0_powerpc,
113    vmx_v1_powerpc,
114    vmx_v2_powerpc,
115    vmx_v3_powerpc,
116    vmx_v4_powerpc,
117    vmx_v5_powerpc,
118    vmx_v6_powerpc,
119    vmx_v7_powerpc,
120    vmx_v8_powerpc,
121    vmx_v9_powerpc,
122    vmx_v10_powerpc,
123    vmx_v11_powerpc,
124    vmx_v12_powerpc,
125    vmx_v13_powerpc,
126    vmx_v14_powerpc,
127    vmx_v15_powerpc,
128    vmx_v16_powerpc,
129    vmx_v17_powerpc,
130    vmx_v18_powerpc,
131    vmx_v19_powerpc,
132    vmx_v20_powerpc,
133    vmx_v21_powerpc,
134    vmx_v22_powerpc,
135    vmx_v23_powerpc,
136    vmx_v24_powerpc,
137    vmx_v25_powerpc,
138    vmx_v26_powerpc,
139    vmx_v27_powerpc,
140    vmx_v28_powerpc,
141    vmx_v29_powerpc,
142    vmx_v30_powerpc,
143    vmx_v31_powerpc,
144    vmx_vrsave_powerpc,
145    vmx_vscr_powerpc,
146};
147
148// Number of register sets provided by this context.
149enum
150{
151    k_num_register_sets = 3
152};
153
154static const RegisterSet
155g_reg_sets_powerpc[k_num_register_sets] =
156{
157    { "General Purpose Registers",  "gpr", k_num_gpr_registers_powerpc, g_gpr_regnums },
158    { "Floating Point Registers",  "fpr", k_num_fpr_registers_powerpc, g_fpr_regnums },
159    { "Altivec/VMX Registers",  "vmx", k_num_vmx_registers_powerpc, g_vmx_regnums },
160};
161
162static_assert(k_first_gpr_powerpc == 0, "GPRs must index starting at 0, or fix IsGPR()");
163bool RegisterContextPOSIX_powerpc::IsGPR(unsigned reg)
164{
165    return (reg <= k_last_gpr_powerpc);   // GPR's come first.
166}
167
168bool
169RegisterContextPOSIX_powerpc::IsFPR(unsigned reg)
170{
171    return (reg >= k_first_fpr) && (reg <= k_last_fpr);
172}
173
174bool
175RegisterContextPOSIX_powerpc::IsVMX(unsigned reg)
176{
177    return (reg >= k_first_vmx) && (reg <= k_last_vmx);
178}
179
180RegisterContextPOSIX_powerpc::RegisterContextPOSIX_powerpc(Thread &thread,
181                                               uint32_t concrete_frame_idx,
182                                               RegisterInfoInterface *register_info)
183    : RegisterContext(thread, concrete_frame_idx)
184{
185    m_register_info_ap.reset(register_info);
186
187    // elf-core yet to support ReadFPR()
188    ProcessSP base = CalculateProcess();
189    if (base.get()->GetPluginName() ==  ProcessElfCore::GetPluginNameStatic())
190        return;
191}
192
193RegisterContextPOSIX_powerpc::~RegisterContextPOSIX_powerpc()
194{
195}
196
197void
198RegisterContextPOSIX_powerpc::Invalidate()
199{
200}
201
202void
203RegisterContextPOSIX_powerpc::InvalidateAllRegisters()
204{
205}
206
207unsigned
208RegisterContextPOSIX_powerpc::GetRegisterOffset(unsigned reg)
209{
210    assert(reg < k_num_registers_powerpc && "Invalid register number.");
211    return GetRegisterInfo()[reg].byte_offset;
212}
213
214unsigned
215RegisterContextPOSIX_powerpc::GetRegisterSize(unsigned reg)
216{
217    assert(reg < k_num_registers_powerpc && "Invalid register number.");
218    return GetRegisterInfo()[reg].byte_size;
219}
220
221size_t
222RegisterContextPOSIX_powerpc::GetRegisterCount()
223{
224    size_t num_registers = k_num_registers_powerpc;
225    return num_registers;
226}
227
228size_t
229RegisterContextPOSIX_powerpc::GetGPRSize()
230{
231    return m_register_info_ap->GetGPRSize();
232}
233
234const RegisterInfo *
235RegisterContextPOSIX_powerpc::GetRegisterInfo()
236{
237    // Commonly, this method is overridden and g_register_infos is copied and specialized.
238    // So, use GetRegisterInfo() rather than g_register_infos in this scope.
239    return m_register_info_ap->GetRegisterInfo ();
240}
241
242const RegisterInfo *
243RegisterContextPOSIX_powerpc::GetRegisterInfoAtIndex(size_t reg)
244{
245    if (reg < k_num_registers_powerpc)
246        return &GetRegisterInfo()[reg];
247    else
248        return NULL;
249}
250
251size_t
252RegisterContextPOSIX_powerpc::GetRegisterSetCount()
253{
254    size_t sets = 0;
255    for (size_t set = 0; set < k_num_register_sets; ++set)
256    {
257        if (IsRegisterSetAvailable(set))
258            ++sets;
259    }
260
261    return sets;
262}
263
264const RegisterSet *
265RegisterContextPOSIX_powerpc::GetRegisterSet(size_t set)
266{
267    if (IsRegisterSetAvailable(set))
268        return &g_reg_sets_powerpc[set];
269    else
270        return NULL;
271}
272
273const char *
274RegisterContextPOSIX_powerpc::GetRegisterName(unsigned reg)
275{
276    assert(reg < k_num_registers_powerpc && "Invalid register offset.");
277    return GetRegisterInfo()[reg].name;
278}
279
280lldb::ByteOrder
281RegisterContextPOSIX_powerpc::GetByteOrder()
282{
283    // Get the target process whose privileged thread was used for the register read.
284    lldb::ByteOrder byte_order = eByteOrderInvalid;
285    Process *process = CalculateProcess().get();
286
287    if (process)
288        byte_order = process->GetByteOrder();
289    return byte_order;
290}
291
292bool
293RegisterContextPOSIX_powerpc::IsRegisterSetAvailable(size_t set_index)
294{
295    size_t num_sets = k_num_register_sets;
296
297    return (set_index < num_sets);
298}
299
300// Used when parsing DWARF and EH frame information and any other
301// object file sections that contain register numbers in them.
302uint32_t
303RegisterContextPOSIX_powerpc::ConvertRegisterKindToRegisterNumber(lldb::RegisterKind kind,
304                                                                 uint32_t num)
305{
306    const uint32_t num_regs = GetRegisterCount();
307
308    assert (kind < kNumRegisterKinds);
309    for (uint32_t reg_idx = 0; reg_idx < num_regs; ++reg_idx)
310    {
311        const RegisterInfo *reg_info = GetRegisterInfoAtIndex (reg_idx);
312
313        if (reg_info->kinds[kind] == num)
314            return reg_idx;
315    }
316
317    return LLDB_INVALID_REGNUM;
318}
319
320