xref: /openbmc/qemu/target/s390x/gdbstub.c (revision 2b74dd91)
1 /*
2  * s390x 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 
21 #include "qemu/osdep.h"
22 #include "cpu.h"
23 #include "s390x-internal.h"
24 #include "exec/exec-all.h"
25 #include "exec/gdbstub.h"
26 #include "gdbstub/helpers.h"
27 #include "qemu/bitops.h"
28 #include "sysemu/hw_accel.h"
29 #include "sysemu/tcg.h"
30 
31 int s390_cpu_gdb_read_register(CPUState *cs, GByteArray *mem_buf, int n)
32 {
33     CPUS390XState *env = cpu_env(cs);
34 
35     switch (n) {
36     case S390_PSWM_REGNUM:
37         return gdb_get_regl(mem_buf, s390_cpu_get_psw_mask(env));
38     case S390_PSWA_REGNUM:
39         return gdb_get_regl(mem_buf, env->psw.addr);
40     case S390_R0_REGNUM ... S390_R15_REGNUM:
41         return gdb_get_regl(mem_buf, env->regs[n - S390_R0_REGNUM]);
42     }
43     return 0;
44 }
45 
46 int s390_cpu_gdb_write_register(CPUState *cs, uint8_t *mem_buf, int n)
47 {
48     CPUS390XState *env = cpu_env(cs);
49     target_ulong tmpl = ldtul_p(mem_buf);
50 
51     switch (n) {
52     case S390_PSWM_REGNUM:
53         s390_cpu_set_psw(env, tmpl, env->psw.addr);
54         break;
55     case S390_PSWA_REGNUM:
56         env->psw.addr = tmpl;
57         break;
58     case S390_R0_REGNUM ... S390_R15_REGNUM:
59         env->regs[n - S390_R0_REGNUM] = tmpl;
60         break;
61     default:
62         return 0;
63     }
64     return 8;
65 }
66 
67 /* the values represent the positions in s390-acr.xml */
68 #define S390_A0_REGNUM 0
69 #define S390_A15_REGNUM 15
70 
71 static int cpu_read_ac_reg(CPUState *cs, GByteArray *buf, int n)
72 {
73     S390CPU *cpu = S390_CPU(cs);
74     CPUS390XState *env = &cpu->env;
75 
76     switch (n) {
77     case S390_A0_REGNUM ... S390_A15_REGNUM:
78         return gdb_get_reg32(buf, env->aregs[n]);
79     default:
80         return 0;
81     }
82 }
83 
84 static int cpu_write_ac_reg(CPUState *cs, uint8_t *mem_buf, int n)
85 {
86     S390CPU *cpu = S390_CPU(cs);
87     CPUS390XState *env = &cpu->env;
88 
89     switch (n) {
90     case S390_A0_REGNUM ... S390_A15_REGNUM:
91         env->aregs[n] = ldl_p(mem_buf);
92         cpu_synchronize_post_init(env_cpu(env));
93         return 4;
94     default:
95         return 0;
96     }
97 }
98 
99 /* the values represent the positions in s390-fpr.xml */
100 #define S390_FPC_REGNUM 0
101 #define S390_F0_REGNUM 1
102 #define S390_F15_REGNUM 16
103 
104 static int cpu_read_fp_reg(CPUState *cs, GByteArray *buf, int n)
105 {
106     S390CPU *cpu = S390_CPU(cs);
107     CPUS390XState *env = &cpu->env;
108 
109     switch (n) {
110     case S390_FPC_REGNUM:
111         return gdb_get_reg32(buf, env->fpc);
112     case S390_F0_REGNUM ... S390_F15_REGNUM:
113         return gdb_get_reg64(buf, *get_freg(env, n - S390_F0_REGNUM));
114     default:
115         return 0;
116     }
117 }
118 
119 static int cpu_write_fp_reg(CPUState *cs, uint8_t *mem_buf, int n)
120 {
121     S390CPU *cpu = S390_CPU(cs);
122     CPUS390XState *env = &cpu->env;
123 
124     switch (n) {
125     case S390_FPC_REGNUM:
126         env->fpc = ldl_p(mem_buf);
127         return 4;
128     case S390_F0_REGNUM ... S390_F15_REGNUM:
129         *get_freg(env, n - S390_F0_REGNUM) = ldtul_p(mem_buf);
130         return 8;
131     default:
132         return 0;
133     }
134 }
135 
136 /* the values represent the positions in s390-vx.xml */
137 #define S390_V0L_REGNUM 0
138 #define S390_V15L_REGNUM 15
139 #define S390_V16_REGNUM 16
140 #define S390_V31_REGNUM 31
141 
142 static int cpu_read_vreg(CPUState *cs, GByteArray *buf, int n)
143 {
144     S390CPU *cpu = S390_CPU(cs);
145     CPUS390XState *env = &cpu->env;
146     int ret;
147 
148     switch (n) {
149     case S390_V0L_REGNUM ... S390_V15L_REGNUM:
150         ret = gdb_get_reg64(buf, env->vregs[n][1]);
151         break;
152     case S390_V16_REGNUM ... S390_V31_REGNUM:
153         ret = gdb_get_reg64(buf, env->vregs[n][0]);
154         ret += gdb_get_reg64(buf, env->vregs[n][1]);
155         break;
156     default:
157         ret = 0;
158     }
159 
160     return ret;
161 }
162 
163 static int cpu_write_vreg(CPUState *cs, uint8_t *mem_buf, int n)
164 {
165     S390CPU *cpu = S390_CPU(cs);
166     CPUS390XState *env = &cpu->env;
167 
168     switch (n) {
169     case S390_V0L_REGNUM ... S390_V15L_REGNUM:
170         env->vregs[n][1] = ldtul_p(mem_buf + 8);
171         return 8;
172     case S390_V16_REGNUM ... S390_V31_REGNUM:
173         env->vregs[n][0] = ldtul_p(mem_buf);
174         env->vregs[n][1] = ldtul_p(mem_buf + 8);
175         return 16;
176     default:
177         return 0;
178     }
179 }
180 
181 /* the values represent the positions in s390-cr.xml */
182 #define S390_C0_REGNUM 0
183 #define S390_C15_REGNUM 15
184 
185 #ifndef CONFIG_USER_ONLY
186 static int cpu_read_c_reg(CPUState *cs, GByteArray *buf, int n)
187 {
188     S390CPU *cpu = S390_CPU(cs);
189     CPUS390XState *env = &cpu->env;
190 
191     switch (n) {
192     case S390_C0_REGNUM ... S390_C15_REGNUM:
193         return gdb_get_regl(buf, env->cregs[n]);
194     default:
195         return 0;
196     }
197 }
198 
199 static int cpu_write_c_reg(CPUState *cs, uint8_t *mem_buf, int n)
200 {
201     S390CPU *cpu = S390_CPU(cs);
202     CPUS390XState *env = &cpu->env;
203 
204     switch (n) {
205     case S390_C0_REGNUM ... S390_C15_REGNUM:
206         env->cregs[n] = ldtul_p(mem_buf);
207         if (tcg_enabled()) {
208             tlb_flush(env_cpu(env));
209         }
210         cpu_synchronize_post_init(env_cpu(env));
211         return 8;
212     default:
213         return 0;
214     }
215 }
216 
217 /* the values represent the positions in s390-virt.xml */
218 #define S390_VIRT_CKC_REGNUM    0
219 #define S390_VIRT_CPUTM_REGNUM  1
220 #define S390_VIRT_BEA_REGNUM    2
221 #define S390_VIRT_PREFIX_REGNUM 3
222 
223 static int cpu_read_virt_reg(CPUState *cs, GByteArray *mem_buf, int n)
224 {
225     S390CPU *cpu = S390_CPU(cs);
226     CPUS390XState *env = &cpu->env;
227 
228     switch (n) {
229     case S390_VIRT_CKC_REGNUM:
230         return gdb_get_regl(mem_buf, env->ckc);
231     case S390_VIRT_CPUTM_REGNUM:
232         return gdb_get_regl(mem_buf, env->cputm);
233     case S390_VIRT_BEA_REGNUM:
234         return gdb_get_regl(mem_buf, env->gbea);
235     case S390_VIRT_PREFIX_REGNUM:
236         return gdb_get_regl(mem_buf, env->psa);
237     default:
238         return 0;
239     }
240 }
241 
242 static int cpu_write_virt_reg(CPUState *cs, uint8_t *mem_buf, int n)
243 {
244     S390CPU *cpu = S390_CPU(cs);
245     CPUS390XState *env = &cpu->env;
246 
247     switch (n) {
248     case S390_VIRT_CKC_REGNUM:
249         env->ckc = ldtul_p(mem_buf);
250         cpu_synchronize_post_init(cs);
251         return 8;
252     case S390_VIRT_CPUTM_REGNUM:
253         env->cputm = ldtul_p(mem_buf);
254         cpu_synchronize_post_init(cs);
255         return 8;
256     case S390_VIRT_BEA_REGNUM:
257         env->gbea = ldtul_p(mem_buf);
258         cpu_synchronize_post_init(cs);
259         return 8;
260     case S390_VIRT_PREFIX_REGNUM:
261         env->psa = ldtul_p(mem_buf);
262         cpu_synchronize_post_init(cs);
263         return 8;
264     default:
265         return 0;
266     }
267 }
268 
269 /* the values represent the positions in s390-virt-kvm.xml */
270 #define S390_VIRT_KVM_PP_REGNUM     0
271 #define S390_VIRT_KVM_PFT_REGNUM    1
272 #define S390_VIRT_KVM_PFS_REGNUM    2
273 #define S390_VIRT_KVM_PFC_REGNUM    3
274 
275 static int cpu_read_virt_kvm_reg(CPUState *cs, GByteArray *mem_buf, int n)
276 {
277     S390CPU *cpu = S390_CPU(cs);
278     CPUS390XState *env = &cpu->env;
279 
280     switch (n) {
281     case S390_VIRT_KVM_PP_REGNUM:
282         return gdb_get_regl(mem_buf, env->pp);
283     case S390_VIRT_KVM_PFT_REGNUM:
284         return gdb_get_regl(mem_buf, env->pfault_token);
285     case S390_VIRT_KVM_PFS_REGNUM:
286         return gdb_get_regl(mem_buf, env->pfault_select);
287     case S390_VIRT_KVM_PFC_REGNUM:
288         return gdb_get_regl(mem_buf, env->pfault_compare);
289     default:
290         return 0;
291     }
292 }
293 
294 static int cpu_write_virt_kvm_reg(CPUState *cs, uint8_t *mem_buf, int n)
295 {
296     S390CPU *cpu = S390_CPU(cs);
297     CPUS390XState *env = &cpu->env;
298 
299     switch (n) {
300     case S390_VIRT_KVM_PP_REGNUM:
301         env->pp = ldtul_p(mem_buf);
302         cpu_synchronize_post_init(env_cpu(env));
303         return 8;
304     case S390_VIRT_KVM_PFT_REGNUM:
305         env->pfault_token = ldtul_p(mem_buf);
306         cpu_synchronize_post_init(env_cpu(env));
307         return 8;
308     case S390_VIRT_KVM_PFS_REGNUM:
309         env->pfault_select = ldtul_p(mem_buf);
310         cpu_synchronize_post_init(env_cpu(env));
311         return 8;
312     case S390_VIRT_KVM_PFC_REGNUM:
313         env->pfault_compare = ldtul_p(mem_buf);
314         cpu_synchronize_post_init(env_cpu(env));
315         return 8;
316     default:
317         return 0;
318     }
319 }
320 #endif
321 
322 /* the values represent the positions in s390-gs.xml */
323 #define S390_GS_RESERVED_REGNUM 0
324 #define S390_GS_GSD_REGNUM      1
325 #define S390_GS_GSSM_REGNUM     2
326 #define S390_GS_GSEPLA_REGNUM   3
327 
328 static int cpu_read_gs_reg(CPUState *cs, GByteArray *buf, int n)
329 {
330     S390CPU *cpu = S390_CPU(cs);
331     CPUS390XState *env = &cpu->env;
332 
333     return gdb_get_regl(buf, env->gscb[n]);
334 }
335 
336 static int cpu_write_gs_reg(CPUState *cs, uint8_t *mem_buf, int n)
337 {
338     S390CPU *cpu = S390_CPU(cs);
339     CPUS390XState *env = &cpu->env;
340 
341     env->gscb[n] = ldtul_p(mem_buf);
342     cpu_synchronize_post_init(env_cpu(env));
343     return 8;
344 }
345 
346 void s390_cpu_gdb_init(CPUState *cs)
347 {
348     gdb_register_coprocessor(cs, cpu_read_ac_reg,
349                              cpu_write_ac_reg,
350                              gdb_find_static_feature("s390-acr.xml"), 0);
351 
352     gdb_register_coprocessor(cs, cpu_read_fp_reg,
353                              cpu_write_fp_reg,
354                              gdb_find_static_feature("s390-fpr.xml"), 0);
355 
356     gdb_register_coprocessor(cs, cpu_read_vreg,
357                              cpu_write_vreg,
358                              gdb_find_static_feature("s390-vx.xml"), 0);
359 
360     gdb_register_coprocessor(cs, cpu_read_gs_reg,
361                              cpu_write_gs_reg,
362                              gdb_find_static_feature("s390-gs.xml"), 0);
363 
364 #ifndef CONFIG_USER_ONLY
365     gdb_register_coprocessor(cs, cpu_read_c_reg,
366                              cpu_write_c_reg,
367                              gdb_find_static_feature("s390-cr.xml"), 0);
368 
369     gdb_register_coprocessor(cs, cpu_read_virt_reg,
370                              cpu_write_virt_reg,
371                              gdb_find_static_feature("s390-virt.xml"), 0);
372 
373     if (kvm_enabled()) {
374         gdb_register_coprocessor(cs, cpu_read_virt_kvm_reg,
375                                  cpu_write_virt_kvm_reg,
376                                  gdb_find_static_feature("s390-virt-kvm.xml"),
377                                  0);
378     }
379 #endif
380 }
381