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Merge remote-tracking branch 'remotes/ehabkost/tags/machine-next-pull-request' into...
[qemu.git] / target / i386 / gdbstub.c
CommitLineData
f20f9df0
AF		 1/*
2 * x86 gdb server stub
3 *
4 * Copyright (c) 2003-2005 Fabrice Bellard
5 * Copyright (c) 2013 SUSE LINUX Products GmbH
6 *
7 * This library is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2 of the License, or (at your option) any later version.
11 *
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with this library; if not, see <http://www.gnu.org/licenses/>.
19 */
b6a0aa05 20#include "qemu/osdep.h"
33c11879 21#include "cpu.h"
5b50e790 22#include "exec/gdbstub.h"
f20f9df0
AF		 23
24#ifdef TARGET_X86_64
25static const int gpr_map[16] = {
26 R_EAX, R_EBX, R_ECX, R_EDX, R_ESI, R_EDI, R_EBP, R_ESP,
27 8, 9, 10, 11, 12, 13, 14, 15
28};
29#else
30#define gpr_map gpr_map32
31#endif
32static const int gpr_map32[8] = { 0, 1, 2, 3, 4, 5, 6, 7 };
33
7b0f97ba
DG		 34/*
35 * Keep these in sync with assignment to
36 * gdb_num_core_regs in target/i386/cpu.c
37 * and with the machine description
38 */
39
40/*
41 * SEG: 6 segments, plus fs_base, gs_base, kernel_gs_base
42 */
43
44/*
45 * general regs -----> 8 or 16
46 */
47#define IDX_NB_IP 1
48#define IDX_NB_FLAGS 1
49#define IDX_NB_SEG (6 + 3)
50#define IDX_NB_CTL 6
51#define IDX_NB_FP 16
52/*
53 * fpu regs ----------> 8 or 16
54 */
55#define IDX_NB_MXCSR 1
56/*
57 * total ----> 8+1+1+9+6+16+8+1=50 or 16+1+1+9+6+16+16+1=66
58 */
59
f20f9df0 60#define IDX_IP_REG CPU_NB_REGS
7b0f97ba
DG		 61#define IDX_FLAGS_REG (IDX_IP_REG + IDX_NB_IP)
62#define IDX_SEG_REGS (IDX_FLAGS_REG + IDX_NB_FLAGS)
63#define IDX_CTL_REGS (IDX_SEG_REGS + IDX_NB_SEG)
64#define IDX_FP_REGS (IDX_CTL_REGS + IDX_NB_CTL)
65#define IDX_XMM_REGS (IDX_FP_REGS + IDX_NB_FP)
f20f9df0
AF		 66#define IDX_MXCSR_REG (IDX_XMM_REGS + CPU_NB_REGS)
67
7b0f97ba
DG		 68#define IDX_CTL_CR0_REG (IDX_CTL_REGS + 0)
69#define IDX_CTL_CR2_REG (IDX_CTL_REGS + 1)
70#define IDX_CTL_CR3_REG (IDX_CTL_REGS + 2)
71#define IDX_CTL_CR4_REG (IDX_CTL_REGS + 3)
72#define IDX_CTL_CR8_REG (IDX_CTL_REGS + 4)
73#define IDX_CTL_EFER_REG (IDX_CTL_REGS + 5)
74
75#ifdef TARGET_X86_64
76#define GDB_FORCE_64 1
77#else
78#define GDB_FORCE_64 0
79#endif
80
81
a010bdbe 82int x86_cpu_gdb_read_register(CPUState *cs, GByteArray *mem_buf, int n)
f20f9df0 83{
5b50e790
AF		 84 X86CPU *cpu = X86_CPU(cs);
85 CPUX86State *env = &cpu->env;
86
7b0f97ba
DG		 87 uint64_t tpr;
88
e3592bc9
DE		 89 /* N.B. GDB can't deal with changes in registers or sizes in the middle
90 of a session. So if we're in 32-bit mode on a 64-bit cpu, still act
91 as if we're on a 64-bit cpu. */
92
f20f9df0 93 if (n < CPU_NB_REGS) {
e3592bc9
DE		 94 if (TARGET_LONG_BITS == 64) {
95 if (env->hflags & HF_CS64_MASK) {
96 return gdb_get_reg64(mem_buf, env->regs[gpr_map[n]]);
97 } else if (n < CPU_NB_REGS32) {
98 return gdb_get_reg64(mem_buf,
99 env->regs[gpr_map[n]] & 0xffffffffUL);
100 } else {
b7b8756a 101 return gdb_get_regl(mem_buf, 0);
e3592bc9
DE		 102 }
103 } else {
986a2998 104 return gdb_get_reg32(mem_buf, env->regs[gpr_map32[n]]);
f20f9df0
AF		 105 }
106 } else if (n >= IDX_FP_REGS && n < IDX_FP_REGS + 8) {
b7b8756a
AB		 107 floatx80 *fp = (floatx80 *) &env->fpregs[n - IDX_FP_REGS];
108 int len = gdb_get_reg64(mem_buf, cpu_to_le64(fp->low));
bbc40fef 109 len += gdb_get_reg16(mem_buf, cpu_to_le16(fp->high));
b7b8756a 110 return len;
f20f9df0
AF		 111 } else if (n >= IDX_XMM_REGS && n < IDX_XMM_REGS + CPU_NB_REGS) {
112 n -= IDX_XMM_REGS;
e3592bc9 113 if (n < CPU_NB_REGS32 || TARGET_LONG_BITS == 64) {
b7b8756a
AB		 114 return gdb_get_reg128(mem_buf,
115 env->xmm_regs[n].ZMM_Q(0),
116 env->xmm_regs[n].ZMM_Q(1));
f20f9df0
AF		 117 }
118 } else {
119 switch (n) {
120 case IDX_IP_REG:
e3592bc9
DE		 121 if (TARGET_LONG_BITS == 64) {
122 if (env->hflags & HF_CS64_MASK) {
123 return gdb_get_reg64(mem_buf, env->eip);
124 } else {
125 return gdb_get_reg64(mem_buf, env->eip & 0xffffffffUL);
126 }
f20f9df0 127 } else {
986a2998 128 return gdb_get_reg32(mem_buf, env->eip);
f20f9df0
AF		 129 }
130 case IDX_FLAGS_REG:
986a2998 131 return gdb_get_reg32(mem_buf, env->eflags);
f20f9df0
AF		 132
133 case IDX_SEG_REGS:
986a2998 134 return gdb_get_reg32(mem_buf, env->segs[R_CS].selector);
f20f9df0 135 case IDX_SEG_REGS + 1:
986a2998 136 return gdb_get_reg32(mem_buf, env->segs[R_SS].selector);
f20f9df0 137 case IDX_SEG_REGS + 2:
986a2998 138 return gdb_get_reg32(mem_buf, env->segs[R_DS].selector);
f20f9df0 139 case IDX_SEG_REGS + 3:
986a2998 140 return gdb_get_reg32(mem_buf, env->segs[R_ES].selector);
f20f9df0 141 case IDX_SEG_REGS + 4:
986a2998 142 return gdb_get_reg32(mem_buf, env->segs[R_FS].selector);
f20f9df0 143 case IDX_SEG_REGS + 5:
986a2998 144 return gdb_get_reg32(mem_buf, env->segs[R_GS].selector);
f20f9df0 145
7b0f97ba
DG		 146 case IDX_SEG_REGS + 6:
147 if ((env->hflags & HF_CS64_MASK) || GDB_FORCE_64) {
148 return gdb_get_reg64(mem_buf, env->segs[R_FS].base);
149 }
150 return gdb_get_reg32(mem_buf, env->segs[R_FS].base);
151
152 case IDX_SEG_REGS + 7:
153 if ((env->hflags & HF_CS64_MASK) || GDB_FORCE_64) {
154 return gdb_get_reg64(mem_buf, env->segs[R_GS].base);
155 }
156 return gdb_get_reg32(mem_buf, env->segs[R_GS].base);
157
158 case IDX_SEG_REGS + 8:
159#ifdef TARGET_X86_64
160 if ((env->hflags & HF_CS64_MASK) || GDB_FORCE_64) {
161 return gdb_get_reg64(mem_buf, env->kernelgsbase);
162 }
163 return gdb_get_reg32(mem_buf, env->kernelgsbase);
164#else
165 return gdb_get_reg32(mem_buf, 0);
166#endif
167
f20f9df0 168 case IDX_FP_REGS + 8:
986a2998 169 return gdb_get_reg32(mem_buf, env->fpuc);
f20f9df0 170 case IDX_FP_REGS + 9:
986a2998
AF		 171 return gdb_get_reg32(mem_buf, (env->fpus & ~0x3800) |
172 (env->fpstt & 0x7) << 11);
f20f9df0 173 case IDX_FP_REGS + 10:
986a2998 174 return gdb_get_reg32(mem_buf, 0); /* ftag */
f20f9df0 175 case IDX_FP_REGS + 11:
986a2998 176 return gdb_get_reg32(mem_buf, 0); /* fiseg */
f20f9df0 177 case IDX_FP_REGS + 12:
986a2998 178 return gdb_get_reg32(mem_buf, 0); /* fioff */
f20f9df0 179 case IDX_FP_REGS + 13:
986a2998 180 return gdb_get_reg32(mem_buf, 0); /* foseg */
f20f9df0 181 case IDX_FP_REGS + 14:
986a2998 182 return gdb_get_reg32(mem_buf, 0); /* fooff */
f20f9df0 183 case IDX_FP_REGS + 15:
986a2998 184 return gdb_get_reg32(mem_buf, 0); /* fop */
f20f9df0
AF		 185
186 case IDX_MXCSR_REG:
418b0f93 187 update_mxcsr_from_sse_status(env);
986a2998 188 return gdb_get_reg32(mem_buf, env->mxcsr);
7b0f97ba
DG		 189
190 case IDX_CTL_CR0_REG:
191 if ((env->hflags & HF_CS64_MASK) || GDB_FORCE_64) {
192 return gdb_get_reg64(mem_buf, env->cr[0]);
193 }
194 return gdb_get_reg32(mem_buf, env->cr[0]);
195
196 case IDX_CTL_CR2_REG:
197 if ((env->hflags & HF_CS64_MASK) || GDB_FORCE_64) {
198 return gdb_get_reg64(mem_buf, env->cr[2]);
199 }
200 return gdb_get_reg32(mem_buf, env->cr[2]);
201
202 case IDX_CTL_CR3_REG:
203 if ((env->hflags & HF_CS64_MASK) || GDB_FORCE_64) {
204 return gdb_get_reg64(mem_buf, env->cr[3]);
205 }
206 return gdb_get_reg32(mem_buf, env->cr[3]);
207
208 case IDX_CTL_CR4_REG:
209 if ((env->hflags & HF_CS64_MASK) || GDB_FORCE_64) {
210 return gdb_get_reg64(mem_buf, env->cr[4]);
211 }
212 return gdb_get_reg32(mem_buf, env->cr[4]);
213
214 case IDX_CTL_CR8_REG:
215#ifdef CONFIG_SOFTMMU
216 tpr = cpu_get_apic_tpr(cpu->apic_state);
217#else
218 tpr = 0;
219#endif
220 if ((env->hflags & HF_CS64_MASK) || GDB_FORCE_64) {
221 return gdb_get_reg64(mem_buf, tpr);
222 }
223 return gdb_get_reg32(mem_buf, tpr);
224
225 case IDX_CTL_EFER_REG:
226 if ((env->hflags & HF_CS64_MASK) || GDB_FORCE_64) {
227 return gdb_get_reg64(mem_buf, env->efer);
228 }
229 return gdb_get_reg32(mem_buf, env->efer);
f20f9df0
AF		 230 }
231 }
232 return 0;
233}
234
5b50e790 235static int x86_cpu_gdb_load_seg(X86CPU *cpu, int sreg, uint8_t *mem_buf)
f20f9df0 236{
5b50e790 237 CPUX86State *env = &cpu->env;
f20f9df0
AF		 238 uint16_t selector = ldl_p(mem_buf);
239
240 if (selector != env->segs[sreg].selector) {
241#if defined(CONFIG_USER_ONLY)
242 cpu_x86_load_seg(env, sreg, selector);
243#else
244 unsigned int limit, flags;
245 target_ulong base;
246
247 if (!(env->cr[0] & CR0_PE_MASK) || (env->eflags & VM_MASK)) {
b98dbc90 248 int dpl = (env->eflags & VM_MASK) ? 3 : 0;
f20f9df0
AF		 249 base = selector << 4;
250 limit = 0xffff;
b98dbc90
PB		 251 flags = DESC_P_MASK | DESC_S_MASK | DESC_W_MASK |
252 DESC_A_MASK | (dpl << DESC_DPL_SHIFT);
f20f9df0
AF		 253 } else {
254 if (!cpu_x86_get_descr_debug(env, selector, &base, &limit,
255 &flags)) {
256 return 4;
257 }
258 }
259 cpu_x86_load_seg_cache(env, sreg, selector, base, limit, flags);
260#endif
261 }
262 return 4;
263}
264
5b50e790 265int x86_cpu_gdb_write_register(CPUState *cs, uint8_t *mem_buf, int n)
f20f9df0 266{
5b50e790
AF		 267 X86CPU *cpu = X86_CPU(cs);
268 CPUX86State *env = &cpu->env;
f20f9df0
AF		 269 uint32_t tmp;
270
e3592bc9
DE		 271 /* N.B. GDB can't deal with changes in registers or sizes in the middle
272 of a session. So if we're in 32-bit mode on a 64-bit cpu, still act
273 as if we're on a 64-bit cpu. */
274
f20f9df0 275 if (n < CPU_NB_REGS) {
e3592bc9
DE		 276 if (TARGET_LONG_BITS == 64) {
277 if (env->hflags & HF_CS64_MASK) {
278 env->regs[gpr_map[n]] = ldtul_p(mem_buf);
279 } else if (n < CPU_NB_REGS32) {
280 env->regs[gpr_map[n]] = ldtul_p(mem_buf) & 0xffffffffUL;
281 }
f20f9df0
AF		 282 return sizeof(target_ulong);
283 } else if (n < CPU_NB_REGS32) {
284 n = gpr_map32[n];
285 env->regs[n] &= ~0xffffffffUL;
286 env->regs[n] |= (uint32_t)ldl_p(mem_buf);
287 return 4;
288 }
289 } else if (n >= IDX_FP_REGS && n < IDX_FP_REGS + 8) {
b7b8756a
AB		 290 floatx80 *fp = (floatx80 *) &env->fpregs[n - IDX_FP_REGS];
291 fp->low = le64_to_cpu(* (uint64_t *) mem_buf);
292 fp->high = le16_to_cpu(* (uint16_t *) (mem_buf + 8));
f20f9df0
AF		 293 return 10;
294 } else if (n >= IDX_XMM_REGS && n < IDX_XMM_REGS + CPU_NB_REGS) {
295 n -= IDX_XMM_REGS;
e3592bc9 296 if (n < CPU_NB_REGS32 || TARGET_LONG_BITS == 64) {
19cbd87c
EH		 297 env->xmm_regs[n].ZMM_Q(0) = ldq_p(mem_buf);
298 env->xmm_regs[n].ZMM_Q(1) = ldq_p(mem_buf + 8);
f20f9df0
AF		 299 return 16;
300 }
301 } else {
302 switch (n) {
303 case IDX_IP_REG:
e3592bc9
DE		 304 if (TARGET_LONG_BITS == 64) {
305 if (env->hflags & HF_CS64_MASK) {
306 env->eip = ldq_p(mem_buf);
307 } else {
308 env->eip = ldq_p(mem_buf) & 0xffffffffUL;
309 }
f20f9df0
AF		 310 return 8;
311 } else {
312 env->eip &= ~0xffffffffUL;
313 env->eip |= (uint32_t)ldl_p(mem_buf);
314 return 4;
315 }
316 case IDX_FLAGS_REG:
317 env->eflags = ldl_p(mem_buf);
318 return 4;
319
320 case IDX_SEG_REGS:
5b50e790 321 return x86_cpu_gdb_load_seg(cpu, R_CS, mem_buf);
f20f9df0 322 case IDX_SEG_REGS + 1:
5b50e790 323 return x86_cpu_gdb_load_seg(cpu, R_SS, mem_buf);
f20f9df0 324 case IDX_SEG_REGS + 2:
5b50e790 325 return x86_cpu_gdb_load_seg(cpu, R_DS, mem_buf);
f20f9df0 326 case IDX_SEG_REGS + 3:
5b50e790 327 return x86_cpu_gdb_load_seg(cpu, R_ES, mem_buf);
f20f9df0 328 case IDX_SEG_REGS + 4:
5b50e790 329 return x86_cpu_gdb_load_seg(cpu, R_FS, mem_buf);
f20f9df0 330 case IDX_SEG_REGS + 5:
5b50e790 331 return x86_cpu_gdb_load_seg(cpu, R_GS, mem_buf);
f20f9df0 332
7b0f97ba
DG		 333 case IDX_SEG_REGS + 6:
334 if (env->hflags & HF_CS64_MASK) {
335 env->segs[R_FS].base = ldq_p(mem_buf);
336 return 8;
337 }
338 env->segs[R_FS].base = ldl_p(mem_buf);
339 return 4;
340
341 case IDX_SEG_REGS + 7:
342 if (env->hflags & HF_CS64_MASK) {
343 env->segs[R_GS].base = ldq_p(mem_buf);
344 return 8;
345 }
346 env->segs[R_GS].base = ldl_p(mem_buf);
347 return 4;
348
7b0f97ba 349 case IDX_SEG_REGS + 8:
5a07192a 350#ifdef TARGET_X86_64
7b0f97ba
DG		 351 if (env->hflags & HF_CS64_MASK) {
352 env->kernelgsbase = ldq_p(mem_buf);
353 return 8;
354 }
355 env->kernelgsbase = ldl_p(mem_buf);
7b0f97ba 356#endif
5a07192a 357 return 4;
7b0f97ba 358
f20f9df0 359 case IDX_FP_REGS + 8:
5bde1407 360 cpu_set_fpuc(env, ldl_p(mem_buf));
f20f9df0
AF		 361 return 4;
362 case IDX_FP_REGS + 9:
363 tmp = ldl_p(mem_buf);
364 env->fpstt = (tmp >> 11) & 7;
365 env->fpus = tmp & ~0x3800;
366 return 4;
367 case IDX_FP_REGS + 10: /* ftag */
368 return 4;
369 case IDX_FP_REGS + 11: /* fiseg */
370 return 4;
371 case IDX_FP_REGS + 12: /* fioff */
372 return 4;
373 case IDX_FP_REGS + 13: /* foseg */
374 return 4;
375 case IDX_FP_REGS + 14: /* fooff */
376 return 4;
377 case IDX_FP_REGS + 15: /* fop */
378 return 4;
379
380 case IDX_MXCSR_REG:
4e47e39a 381 cpu_set_mxcsr(env, ldl_p(mem_buf));
f20f9df0 382 return 4;
7b0f97ba
DG		 383
384 case IDX_CTL_CR0_REG:
385 if (env->hflags & HF_CS64_MASK) {
386 cpu_x86_update_cr0(env, ldq_p(mem_buf));
387 return 8;
388 }
389 cpu_x86_update_cr0(env, ldl_p(mem_buf));
390 return 4;
391
392 case IDX_CTL_CR2_REG:
393 if (env->hflags & HF_CS64_MASK) {
394 env->cr[2] = ldq_p(mem_buf);
395 return 8;
396 }
397 env->cr[2] = ldl_p(mem_buf);
398 return 4;
399
400 case IDX_CTL_CR3_REG:
401 if (env->hflags & HF_CS64_MASK) {
402 cpu_x86_update_cr3(env, ldq_p(mem_buf));
403 return 8;
404 }
405 cpu_x86_update_cr3(env, ldl_p(mem_buf));
406 return 4;
407
408 case IDX_CTL_CR4_REG:
409 if (env->hflags & HF_CS64_MASK) {
410 cpu_x86_update_cr4(env, ldq_p(mem_buf));
411 return 8;
412 }
413 cpu_x86_update_cr4(env, ldl_p(mem_buf));
414 return 4;
415
416 case IDX_CTL_CR8_REG:
417 if (env->hflags & HF_CS64_MASK) {
418#ifdef CONFIG_SOFTMMU
419 cpu_set_apic_tpr(cpu->apic_state, ldq_p(mem_buf));
420#endif
421 return 8;
422 }
423#ifdef CONFIG_SOFTMMU
424 cpu_set_apic_tpr(cpu->apic_state, ldl_p(mem_buf));
425#endif
426 return 4;
427
428 case IDX_CTL_EFER_REG:
429 if (env->hflags & HF_CS64_MASK) {
430 cpu_load_efer(env, ldq_p(mem_buf));
431 return 8;
432 }
433 cpu_load_efer(env, ldl_p(mem_buf));
434 return 4;
435
f20f9df0
AF		 436 }
437 }
438 /* Unrecognised register. */
439 return 0;
440}
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