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1 /*
2 * writing ELF notes for ppc{64,} arch
3 *
4 *
5 * Copyright IBM, Corp. 2013
6 *
7 * Authors:
8 * Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
9 *
10 * This work is licensed under the terms of the GNU GPL, version 2. See
11 * the COPYING file in the top-level directory.
12 *
13 */
14
15 #include "qemu/osdep.h"
16 #include "cpu.h"
17 #include "elf.h"
18 #include "system/dump.h"
19 #include "system/kvm.h"
20
21 #ifdef TARGET_PPC64
22 #define ELFCLASS ELFCLASS64
23 #define cpu_to_dump_reg cpu_to_dump64
24 typedef uint64_t reg_t;
25 typedef Elf64_Nhdr Elf_Nhdr;
26 #else
27 #define ELFCLASS ELFCLASS32
28 #define cpu_to_dump_reg cpu_to_dump32
29 typedef uint32_t reg_t;
30 typedef Elf32_Nhdr Elf_Nhdr;
31 #endif /* TARGET_PPC64 */
32
33 struct PPCUserRegStruct {
34 reg_t gpr[32];
35 reg_t nip;
36 reg_t msr;
37 reg_t orig_gpr3;
38 reg_t ctr;
39 reg_t link;
40 reg_t xer;
41 reg_t ccr;
42 reg_t softe;
43 reg_t trap;
44 reg_t dar;
45 reg_t dsisr;
46 reg_t result;
47 } QEMU_PACKED;
48
49 struct PPCElfPrstatus {
50 char pad1[32]; /* 32 == offsetof(struct elf_prstatus, pr_pid) */
51 uint32_t pid;
52 char pad2[76]; /* 76 == offsetof(struct elf_prstatus, pr_reg) -
53 offsetof(struct elf_prstatus, pr_ppid) */
54 struct PPCUserRegStruct pr_reg;
55 char pad3[40]; /* 40 == sizeof(struct elf_prstatus) -
56 offsetof(struct elf_prstatus, pr_reg) -
57 sizeof(struct user_pt_regs) */
58 } QEMU_PACKED;
59
60
61 struct PPCElfFpregset {
62 uint64_t fpr[32];
63 reg_t fpscr;
64 } QEMU_PACKED;
65
66
67 struct PPCElfVmxregset {
68 ppc_avr_t avr[32];
69 ppc_avr_t vscr;
70 union {
71 ppc_avr_t unused;
72 uint32_t value;
73 } vrsave;
74 } QEMU_PACKED;
75
76 struct PPCElfVsxregset {
77 uint64_t vsr[32];
78 } QEMU_PACKED;
79
80 struct PPCElfSperegset {
81 uint32_t evr[32];
82 uint64_t spe_acc;
83 uint32_t spe_fscr;
84 } QEMU_PACKED;
85
86 typedef struct noteStruct {
87 Elf_Nhdr hdr;
88 char name[5];
89 char pad3[3];
90 union {
91 struct PPCElfPrstatus prstatus;
92 struct PPCElfFpregset fpregset;
93 struct PPCElfVmxregset vmxregset;
94 struct PPCElfVsxregset vsxregset;
95 struct PPCElfSperegset speregset;
96 } contents;
97 } QEMU_PACKED Note;
98
99 typedef struct NoteFuncArg {
100 Note note;
101 DumpState *state;
102 } NoteFuncArg;
103
104 static void ppc_write_elf_prstatus(NoteFuncArg *arg, PowerPCCPU *cpu, int id)
105 {
106 int i;
107 reg_t cr;
108 struct PPCElfPrstatus *prstatus;
109 struct PPCUserRegStruct *reg;
110 Note *note = &arg->note;
111 DumpState *s = arg->state;
112
113 note->hdr.n_type = cpu_to_dump32(s, NT_PRSTATUS);
114
115 prstatus = &note->contents.prstatus;
116 memset(prstatus, 0, sizeof(*prstatus));
117 prstatus->pid = cpu_to_dump32(s, id);
118 reg = &prstatus->pr_reg;
119
120 for (i = 0; i < 32; i++) {
121 reg->gpr[i] = cpu_to_dump_reg(s, cpu->env.gpr[i]);
122 }
123 reg->nip = cpu_to_dump_reg(s, cpu->env.nip);
124 reg->msr = cpu_to_dump_reg(s, cpu->env.msr);
125 reg->ctr = cpu_to_dump_reg(s, cpu->env.ctr);
126 reg->link = cpu_to_dump_reg(s, cpu->env.lr);
127 reg->xer = cpu_to_dump_reg(s, cpu_read_xer(&cpu->env));
128
129 cr = 0;
130 for (i = 0; i < 8; i++) {
131 cr |= (cpu->env.crf[i] & 15) << (4 * (7 - i));
132 }
133 reg->ccr = cpu_to_dump_reg(s, cr);
134 }
135
136 static void ppc_write_elf_fpregset(NoteFuncArg *arg, PowerPCCPU *cpu, int id)
137 {
138 int i;
139 struct PPCElfFpregset *fpregset;
140 Note *note = &arg->note;
141 DumpState *s = arg->state;
142
143 note->hdr.n_type = cpu_to_dump32(s, NT_PRFPREG);
144
145 fpregset = &note->contents.fpregset;
146 memset(fpregset, 0, sizeof(*fpregset));
147
148 for (i = 0; i < 32; i++) {
149 uint64_t *fpr = cpu_fpr_ptr(&cpu->env, i);
150 fpregset->fpr[i] = cpu_to_dump64(s, *fpr);
151 }
152 fpregset->fpscr = cpu_to_dump_reg(s, cpu->env.fpscr);
153 }
154
155 static void ppc_write_elf_vmxregset(NoteFuncArg *arg, PowerPCCPU *cpu, int id)
156 {
157 int i;
158 struct PPCElfVmxregset *vmxregset;
159 Note *note = &arg->note;
160 DumpState *s = arg->state;
161
162 note->hdr.n_type = cpu_to_dump32(s, NT_PPC_VMX);
163 vmxregset = &note->contents.vmxregset;
164 memset(vmxregset, 0, sizeof(*vmxregset));
165
166 for (i = 0; i < 32; i++) {
167 bool needs_byteswap;
168 ppc_avr_t *avr = cpu_avr_ptr(&cpu->env, i);
169
170 #if HOST_BIG_ENDIAN
171 needs_byteswap = s->dump_info.d_endian == ELFDATA2LSB;
172 #else
173 needs_byteswap = s->dump_info.d_endian == ELFDATA2MSB;
174 #endif
175
176 if (needs_byteswap) {
177 vmxregset->avr[i].u64[0] = bswap64(avr->u64[1]);
178 vmxregset->avr[i].u64[1] = bswap64(avr->u64[0]);
179 } else {
180 vmxregset->avr[i].u64[0] = avr->u64[0];
181 vmxregset->avr[i].u64[1] = avr->u64[1];
182 }
183 }
184 vmxregset->vscr.u32[3] = cpu_to_dump32(s, ppc_get_vscr(&cpu->env));
185 }
186
187 static void ppc_write_elf_vsxregset(NoteFuncArg *arg, PowerPCCPU *cpu, int id)
188 {
189 int i;
190 struct PPCElfVsxregset *vsxregset;
191 Note *note = &arg->note;
192 DumpState *s = arg->state;
193
194 note->hdr.n_type = cpu_to_dump32(s, NT_PPC_VSX);
195 vsxregset = &note->contents.vsxregset;
196 memset(vsxregset, 0, sizeof(*vsxregset));
197
198 for (i = 0; i < 32; i++) {
199 uint64_t *vsrl = cpu_vsrl_ptr(&cpu->env, i);
200 vsxregset->vsr[i] = cpu_to_dump64(s, *vsrl);
201 }
202 }
203
204 static void ppc_write_elf_speregset(NoteFuncArg *arg, PowerPCCPU *cpu, int id)
205 {
206 struct PPCElfSperegset *speregset;
207 Note *note = &arg->note;
208 DumpState *s = arg->state;
209
210 note->hdr.n_type = cpu_to_dump32(s, NT_PPC_SPE);
211 speregset = &note->contents.speregset;
212 memset(speregset, 0, sizeof(*speregset));
213
214 speregset->spe_acc = cpu_to_dump64(s, cpu->env.spe_acc);
215 speregset->spe_fscr = cpu_to_dump32(s, cpu->env.spe_fscr);
216 }
217
218 static const struct NoteFuncDescStruct {
219 int contents_size;
220 void (*note_contents_func)(NoteFuncArg *arg, PowerPCCPU *cpu, int id);
221 } note_func[] = {
222 {sizeof_field(Note, contents.prstatus), ppc_write_elf_prstatus},
223 {sizeof_field(Note, contents.fpregset), ppc_write_elf_fpregset},
224 {sizeof_field(Note, contents.vmxregset), ppc_write_elf_vmxregset},
225 {sizeof_field(Note, contents.vsxregset), ppc_write_elf_vsxregset},
226 {sizeof_field(Note, contents.speregset), ppc_write_elf_speregset},
227 { 0, NULL}
228 };
229
230 typedef struct NoteFuncDescStruct NoteFuncDesc;
231
232 int cpu_get_dump_info(ArchDumpInfo *info,
233 const struct GuestPhysBlockList *guest_phys_blocks)
234 {
235 PowerPCCPU *cpu;
236
237 if (first_cpu == NULL) {
238 return -1;
239 }
240
241 cpu = POWERPC_CPU(first_cpu);
242
243 info->d_machine = PPC_ELF_MACHINE;
244 info->d_class = ELFCLASS;
245
246 if (ppc_interrupts_little_endian(cpu, !!(cpu->env.msr_mask & MSR_HVB))) {
247 info->d_endian = ELFDATA2LSB;
248 } else {
249 info->d_endian = ELFDATA2MSB;
250 }
251 /* 64KB is the max page size for pseries kernel */
252 if (strncmp(object_get_typename(qdev_get_machine()),
253 "pseries-", 8) == 0) {
254 info->page_size = (1U << 16);
255 }
256
257 return 0;
258 }
259
260 ssize_t cpu_get_note_size(int class, int machine, int nr_cpus)
261 {
262 int name_size = 8; /* "CORE" or "QEMU" rounded */
263 size_t elf_note_size = 0;
264 int note_head_size;
265 const NoteFuncDesc *nf;
266
267 note_head_size = sizeof(Elf_Nhdr);
268 for (nf = note_func; nf->note_contents_func; nf++) {
269 elf_note_size = elf_note_size + note_head_size + name_size +
270 nf->contents_size;
271 }
272
273 return (elf_note_size) * nr_cpus;
274 }
275
276 static int ppc_write_all_elf_notes(const char *note_name,
277 WriteCoreDumpFunction f,
278 PowerPCCPU *cpu, int id,
279 DumpState *s)
280 {
281 NoteFuncArg arg = { .state = s };
282 int ret = -1;
283 int note_size;
284 const NoteFuncDesc *nf;
285
286 for (nf = note_func; nf->note_contents_func; nf++) {
287 arg.note.hdr.n_namesz = cpu_to_dump32(s, sizeof(arg.note.name));
288 arg.note.hdr.n_descsz = cpu_to_dump32(s, nf->contents_size);
289 strncpy(arg.note.name, note_name, sizeof(arg.note.name));
290
291 (*nf->note_contents_func)(&arg, cpu, id);
292
293 note_size =
294 sizeof(arg.note) - sizeof(arg.note.contents) + nf->contents_size;
295 ret = f(&arg.note, note_size, s);
296 if (ret < 0) {
297 return -1;
298 }
299 }
300 return 0;
301 }
302
303 int ppc64_cpu_write_elf64_note(WriteCoreDumpFunction f, CPUState *cs,
304 int cpuid, DumpState *s)
305 {
306 PowerPCCPU *cpu = POWERPC_CPU(cs);
307 return ppc_write_all_elf_notes("CORE", f, cpu, cpuid, s);
308 }
309
310 int ppc32_cpu_write_elf32_note(WriteCoreDumpFunction f, CPUState *cs,
311 int cpuid, DumpState *s)
312 {
313 PowerPCCPU *cpu = POWERPC_CPU(cs);
314 return ppc_write_all_elf_notes("CORE", f, cpu, cpuid, s);
315 }