xref: /openbmc/qemu/target/i386/gdbstub.c (revision f7a6df5f)
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 2.1 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  */
20 #include "qemu/osdep.h"
21 #include "cpu.h"
22 #include "exec/gdbstub.h"
23 
24 #ifdef TARGET_X86_64
25 static 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
32 static const int gpr_map32[8] = { 0, 1, 2, 3, 4, 5, 6, 7 };
33 
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 
60 #define IDX_IP_REG      CPU_NB_REGS
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)
66 #define IDX_MXCSR_REG   (IDX_XMM_REGS + CPU_NB_REGS)
67 
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 
82 int x86_cpu_gdb_read_register(CPUState *cs, GByteArray *mem_buf, int n)
83 {
84     X86CPU *cpu = X86_CPU(cs);
85     CPUX86State *env = &cpu->env;
86 
87     uint64_t tpr;
88 
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 
93     if (n < CPU_NB_REGS) {
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 {
101                 return gdb_get_regl(mem_buf, 0);
102             }
103         } else {
104             return gdb_get_reg32(mem_buf, env->regs[gpr_map32[n]]);
105         }
106     } else if (n >= IDX_FP_REGS && n < IDX_FP_REGS + 8) {
107         floatx80 *fp = (floatx80 *) &env->fpregs[n - IDX_FP_REGS];
108         int len = gdb_get_reg64(mem_buf, cpu_to_le64(fp->low));
109         len += gdb_get_reg16(mem_buf, cpu_to_le16(fp->high));
110         return len;
111     } else if (n >= IDX_XMM_REGS && n < IDX_XMM_REGS + CPU_NB_REGS) {
112         n -= IDX_XMM_REGS;
113         if (n < CPU_NB_REGS32 || TARGET_LONG_BITS == 64) {
114             return gdb_get_reg128(mem_buf,
115                                   env->xmm_regs[n].ZMM_Q(0),
116                                   env->xmm_regs[n].ZMM_Q(1));
117         }
118     } else {
119         switch (n) {
120         case IDX_IP_REG:
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                 }
127             } else {
128                 return gdb_get_reg32(mem_buf, env->eip);
129             }
130         case IDX_FLAGS_REG:
131             return gdb_get_reg32(mem_buf, env->eflags);
132 
133         case IDX_SEG_REGS:
134             return gdb_get_reg32(mem_buf, env->segs[R_CS].selector);
135         case IDX_SEG_REGS + 1:
136             return gdb_get_reg32(mem_buf, env->segs[R_SS].selector);
137         case IDX_SEG_REGS + 2:
138             return gdb_get_reg32(mem_buf, env->segs[R_DS].selector);
139         case IDX_SEG_REGS + 3:
140             return gdb_get_reg32(mem_buf, env->segs[R_ES].selector);
141         case IDX_SEG_REGS + 4:
142             return gdb_get_reg32(mem_buf, env->segs[R_FS].selector);
143         case IDX_SEG_REGS + 5:
144             return gdb_get_reg32(mem_buf, env->segs[R_GS].selector);
145 
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 
168         case IDX_FP_REGS + 8:
169             return gdb_get_reg32(mem_buf, env->fpuc);
170         case IDX_FP_REGS + 9:
171             return gdb_get_reg32(mem_buf, (env->fpus & ~0x3800) |
172                                           (env->fpstt & 0x7) << 11);
173         case IDX_FP_REGS + 10:
174             return gdb_get_reg32(mem_buf, 0); /* ftag */
175         case IDX_FP_REGS + 11:
176             return gdb_get_reg32(mem_buf, 0); /* fiseg */
177         case IDX_FP_REGS + 12:
178             return gdb_get_reg32(mem_buf, 0); /* fioff */
179         case IDX_FP_REGS + 13:
180             return gdb_get_reg32(mem_buf, 0); /* foseg */
181         case IDX_FP_REGS + 14:
182             return gdb_get_reg32(mem_buf, 0); /* fooff */
183         case IDX_FP_REGS + 15:
184             return gdb_get_reg32(mem_buf, 0); /* fop */
185 
186         case IDX_MXCSR_REG:
187             update_mxcsr_from_sse_status(env);
188             return gdb_get_reg32(mem_buf, env->mxcsr);
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);
230         }
231     }
232     return 0;
233 }
234 
235 static int x86_cpu_gdb_load_seg(X86CPU *cpu, X86Seg sreg, uint8_t *mem_buf)
236 {
237     CPUX86State *env = &cpu->env;
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)) {
248             int dpl = (env->eflags & VM_MASK) ? 3 : 0;
249             base = selector << 4;
250             limit = 0xffff;
251             flags = DESC_P_MASK | DESC_S_MASK | DESC_W_MASK |
252                     DESC_A_MASK | (dpl << DESC_DPL_SHIFT);
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 
265 int x86_cpu_gdb_write_register(CPUState *cs, uint8_t *mem_buf, int n)
266 {
267     X86CPU *cpu = X86_CPU(cs);
268     CPUX86State *env = &cpu->env;
269     uint32_t tmp;
270 
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 
275     if (n < CPU_NB_REGS) {
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             }
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) {
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));
293         return 10;
294     } else if (n >= IDX_XMM_REGS && n < IDX_XMM_REGS + CPU_NB_REGS) {
295         n -= IDX_XMM_REGS;
296         if (n < CPU_NB_REGS32 || TARGET_LONG_BITS == 64) {
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);
299             return 16;
300         }
301     } else {
302         switch (n) {
303         case IDX_IP_REG:
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                 }
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:
321             return x86_cpu_gdb_load_seg(cpu, R_CS, mem_buf);
322         case IDX_SEG_REGS + 1:
323             return x86_cpu_gdb_load_seg(cpu, R_SS, mem_buf);
324         case IDX_SEG_REGS + 2:
325             return x86_cpu_gdb_load_seg(cpu, R_DS, mem_buf);
326         case IDX_SEG_REGS + 3:
327             return x86_cpu_gdb_load_seg(cpu, R_ES, mem_buf);
328         case IDX_SEG_REGS + 4:
329             return x86_cpu_gdb_load_seg(cpu, R_FS, mem_buf);
330         case IDX_SEG_REGS + 5:
331             return x86_cpu_gdb_load_seg(cpu, R_GS, mem_buf);
332 
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 
349         case IDX_SEG_REGS + 8:
350 #ifdef TARGET_X86_64
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);
356 #endif
357             return 4;
358 
359         case IDX_FP_REGS + 8:
360             cpu_set_fpuc(env, ldl_p(mem_buf));
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:
381             cpu_set_mxcsr(env, ldl_p(mem_buf));
382             return 4;
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 
436         }
437     }
438     /* Unrecognised register.  */
439     return 0;
440 }
441