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1 | /* S390 native-dependent code for GDB, the GNU debugger. | |
2 | Copyright (C) 2001, 2003, 2004, 2005, 2006 | |
3 | Free Software Foundation, Inc | |
4 | ||
5 | Contributed by D.J. Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com) | |
6 | for IBM Deutschland Entwicklung GmbH, IBM Corporation. | |
7 | ||
8 | This file is part of GDB. | |
9 | ||
10 | This program is free software; you can redistribute it and/or modify | |
11 | it under the terms of the GNU General Public License as published by | |
12 | the Free Software Foundation; either version 3 of the License, or | |
13 | (at your option) any later version. | |
14 | ||
15 | This program is distributed in the hope that it will be useful, | |
16 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | GNU General Public License for more details. | |
19 | ||
20 | You should have received a copy of the GNU General Public License | |
21 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ | |
22 | ||
23 | #include "defs.h" | |
24 | #include "regcache.h" | |
25 | #include "inferior.h" | |
26 | #include "target.h" | |
27 | #include "linux-nat.h" | |
28 | ||
29 | #include "s390-tdep.h" | |
30 | ||
31 | #include <asm/ptrace.h> | |
32 | #include <sys/ptrace.h> | |
33 | #include <asm/types.h> | |
34 | #include <sys/procfs.h> | |
35 | #include <sys/ucontext.h> | |
36 | ||
37 | ||
38 | /* Map registers to gregset/ptrace offsets. | |
39 | These arrays are defined in s390-tdep.c. */ | |
40 | ||
41 | #ifdef __s390x__ | |
42 | #define regmap_gregset s390x_regmap_gregset | |
43 | #else | |
44 | #define regmap_gregset s390_regmap_gregset | |
45 | #endif | |
46 | ||
47 | #define regmap_fpregset s390_regmap_fpregset | |
48 | ||
49 | /* When debugging a 32-bit executable running under a 64-bit kernel, | |
50 | we have to fix up the 64-bit registers we get from the kernel | |
51 | to make them look like 32-bit registers. */ | |
52 | #ifdef __s390x__ | |
53 | #define SUBOFF(gdbarch, i) \ | |
54 | ((gdbarch_ptr_bit (gdbarch) == 32 \ | |
55 | && ((i) == S390_PSWA_REGNUM \ | |
56 | || ((i) >= S390_R0_REGNUM && (i) <= S390_R15_REGNUM)))? 4 : 0) | |
57 | #else | |
58 | #define SUBOFF(gdbarch, i) 0 | |
59 | #endif | |
60 | ||
61 | ||
62 | /* Fill GDB's register array with the general-purpose register values | |
63 | in *REGP. */ | |
64 | void | |
65 | supply_gregset (struct regcache *regcache, const gregset_t *regp) | |
66 | { | |
67 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
68 | int i; | |
69 | for (i = 0; i < S390_NUM_REGS; i++) | |
70 | if (regmap_gregset[i] != -1) | |
71 | regcache_raw_supply (regcache, i, | |
72 | (const char *)regp + regmap_gregset[i] | |
73 | + SUBOFF (gdbarch, i)); | |
74 | } | |
75 | ||
76 | /* Fill register REGNO (if it is a general-purpose register) in | |
77 | *REGP with the value in GDB's register array. If REGNO is -1, | |
78 | do this for all registers. */ | |
79 | void | |
80 | fill_gregset (const struct regcache *regcache, gregset_t *regp, int regno) | |
81 | { | |
82 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
83 | int i; | |
84 | for (i = 0; i < S390_NUM_REGS; i++) | |
85 | if (regmap_gregset[i] != -1) | |
86 | if (regno == -1 || regno == i) | |
87 | regcache_raw_collect (regcache, i, | |
88 | (char *)regp + regmap_gregset[i] | |
89 | + SUBOFF (gdbarch, i)); | |
90 | } | |
91 | ||
92 | /* Fill GDB's register array with the floating-point register values | |
93 | in *REGP. */ | |
94 | void | |
95 | supply_fpregset (struct regcache *regcache, const fpregset_t *regp) | |
96 | { | |
97 | int i; | |
98 | for (i = 0; i < S390_NUM_REGS; i++) | |
99 | if (regmap_fpregset[i] != -1) | |
100 | regcache_raw_supply (regcache, i, | |
101 | (const char *)regp + regmap_fpregset[i]); | |
102 | } | |
103 | ||
104 | /* Fill register REGNO (if it is a general-purpose register) in | |
105 | *REGP with the value in GDB's register array. If REGNO is -1, | |
106 | do this for all registers. */ | |
107 | void | |
108 | fill_fpregset (const struct regcache *regcache, fpregset_t *regp, int regno) | |
109 | { | |
110 | int i; | |
111 | for (i = 0; i < S390_NUM_REGS; i++) | |
112 | if (regmap_fpregset[i] != -1) | |
113 | if (regno == -1 || regno == i) | |
114 | regcache_raw_collect (regcache, i, | |
115 | (char *)regp + regmap_fpregset[i]); | |
116 | } | |
117 | ||
118 | /* Find the TID for the current inferior thread to use with ptrace. */ | |
119 | static int | |
120 | s390_inferior_tid (void) | |
121 | { | |
122 | /* GNU/Linux LWP ID's are process ID's. */ | |
123 | int tid = TIDGET (inferior_ptid); | |
124 | if (tid == 0) | |
125 | tid = PIDGET (inferior_ptid); /* Not a threaded program. */ | |
126 | ||
127 | return tid; | |
128 | } | |
129 | ||
130 | /* Fetch all general-purpose registers from process/thread TID and | |
131 | store their values in GDB's register cache. */ | |
132 | static void | |
133 | fetch_regs (struct regcache *regcache, int tid) | |
134 | { | |
135 | gregset_t regs; | |
136 | ptrace_area parea; | |
137 | ||
138 | parea.len = sizeof (regs); | |
139 | parea.process_addr = (addr_t) ®s; | |
140 | parea.kernel_addr = offsetof (struct user_regs_struct, psw); | |
141 | if (ptrace (PTRACE_PEEKUSR_AREA, tid, (long) &parea) < 0) | |
142 | perror_with_name (_("Couldn't get registers")); | |
143 | ||
144 | supply_gregset (regcache, (const gregset_t *) ®s); | |
145 | } | |
146 | ||
147 | /* Store all valid general-purpose registers in GDB's register cache | |
148 | into the process/thread specified by TID. */ | |
149 | static void | |
150 | store_regs (const struct regcache *regcache, int tid, int regnum) | |
151 | { | |
152 | gregset_t regs; | |
153 | ptrace_area parea; | |
154 | ||
155 | parea.len = sizeof (regs); | |
156 | parea.process_addr = (addr_t) ®s; | |
157 | parea.kernel_addr = offsetof (struct user_regs_struct, psw); | |
158 | if (ptrace (PTRACE_PEEKUSR_AREA, tid, (long) &parea) < 0) | |
159 | perror_with_name (_("Couldn't get registers")); | |
160 | ||
161 | fill_gregset (regcache, ®s, regnum); | |
162 | ||
163 | if (ptrace (PTRACE_POKEUSR_AREA, tid, (long) &parea) < 0) | |
164 | perror_with_name (_("Couldn't write registers")); | |
165 | } | |
166 | ||
167 | /* Fetch all floating-point registers from process/thread TID and store | |
168 | their values in GDB's register cache. */ | |
169 | static void | |
170 | fetch_fpregs (struct regcache *regcache, int tid) | |
171 | { | |
172 | fpregset_t fpregs; | |
173 | ptrace_area parea; | |
174 | ||
175 | parea.len = sizeof (fpregs); | |
176 | parea.process_addr = (addr_t) &fpregs; | |
177 | parea.kernel_addr = offsetof (struct user_regs_struct, fp_regs); | |
178 | if (ptrace (PTRACE_PEEKUSR_AREA, tid, (long) &parea) < 0) | |
179 | perror_with_name (_("Couldn't get floating point status")); | |
180 | ||
181 | supply_fpregset (regcache, (const fpregset_t *) &fpregs); | |
182 | } | |
183 | ||
184 | /* Store all valid floating-point registers in GDB's register cache | |
185 | into the process/thread specified by TID. */ | |
186 | static void | |
187 | store_fpregs (const struct regcache *regcache, int tid, int regnum) | |
188 | { | |
189 | fpregset_t fpregs; | |
190 | ptrace_area parea; | |
191 | ||
192 | parea.len = sizeof (fpregs); | |
193 | parea.process_addr = (addr_t) &fpregs; | |
194 | parea.kernel_addr = offsetof (struct user_regs_struct, fp_regs); | |
195 | if (ptrace (PTRACE_PEEKUSR_AREA, tid, (long) &parea) < 0) | |
196 | perror_with_name (_("Couldn't get floating point status")); | |
197 | ||
198 | fill_fpregset (regcache, &fpregs, regnum); | |
199 | ||
200 | if (ptrace (PTRACE_POKEUSR_AREA, tid, (long) &parea) < 0) | |
201 | perror_with_name (_("Couldn't write floating point status")); | |
202 | } | |
203 | ||
204 | /* Fetch register REGNUM from the child process. If REGNUM is -1, do | |
205 | this for all registers. */ | |
206 | static void | |
207 | s390_linux_fetch_inferior_registers (struct regcache *regcache, int regnum) | |
208 | { | |
209 | int tid = s390_inferior_tid (); | |
210 | ||
211 | if (regnum == -1 | |
212 | || (regnum < S390_NUM_REGS && regmap_gregset[regnum] != -1)) | |
213 | fetch_regs (regcache, tid); | |
214 | ||
215 | if (regnum == -1 | |
216 | || (regnum < S390_NUM_REGS && regmap_fpregset[regnum] != -1)) | |
217 | fetch_fpregs (regcache, tid); | |
218 | } | |
219 | ||
220 | /* Store register REGNUM back into the child process. If REGNUM is | |
221 | -1, do this for all registers. */ | |
222 | static void | |
223 | s390_linux_store_inferior_registers (struct regcache *regcache, int regnum) | |
224 | { | |
225 | int tid = s390_inferior_tid (); | |
226 | ||
227 | if (regnum == -1 | |
228 | || (regnum < S390_NUM_REGS && regmap_gregset[regnum] != -1)) | |
229 | store_regs (regcache, tid, regnum); | |
230 | ||
231 | if (regnum == -1 | |
232 | || (regnum < S390_NUM_REGS && regmap_fpregset[regnum] != -1)) | |
233 | store_fpregs (regcache, tid, regnum); | |
234 | } | |
235 | ||
236 | ||
237 | /* Hardware-assisted watchpoint handling. */ | |
238 | ||
239 | /* We maintain a list of all currently active watchpoints in order | |
240 | to properly handle watchpoint removal. | |
241 | ||
242 | The only thing we actually need is the total address space area | |
243 | spanned by the watchpoints. */ | |
244 | ||
245 | struct watch_area | |
246 | { | |
247 | struct watch_area *next; | |
248 | CORE_ADDR lo_addr; | |
249 | CORE_ADDR hi_addr; | |
250 | }; | |
251 | ||
252 | static struct watch_area *watch_base = NULL; | |
253 | ||
254 | static int | |
255 | s390_stopped_by_watchpoint (void) | |
256 | { | |
257 | per_lowcore_bits per_lowcore; | |
258 | ptrace_area parea; | |
259 | int result; | |
260 | ||
261 | /* Speed up common case. */ | |
262 | if (!watch_base) | |
263 | return 0; | |
264 | ||
265 | parea.len = sizeof (per_lowcore); | |
266 | parea.process_addr = (addr_t) & per_lowcore; | |
267 | parea.kernel_addr = offsetof (struct user_regs_struct, per_info.lowcore); | |
268 | if (ptrace (PTRACE_PEEKUSR_AREA, s390_inferior_tid (), &parea) < 0) | |
269 | perror_with_name (_("Couldn't retrieve watchpoint status")); | |
270 | ||
271 | result = (per_lowcore.perc_storage_alteration == 1 | |
272 | && per_lowcore.perc_store_real_address == 0); | |
273 | ||
274 | if (result) | |
275 | { | |
276 | /* Do not report this watchpoint again. */ | |
277 | memset (&per_lowcore, 0, sizeof (per_lowcore)); | |
278 | if (ptrace (PTRACE_POKEUSR_AREA, s390_inferior_tid (), &parea) < 0) | |
279 | perror_with_name (_("Couldn't clear watchpoint status")); | |
280 | } | |
281 | ||
282 | return result; | |
283 | } | |
284 | ||
285 | static void | |
286 | s390_fix_watch_points (ptid_t ptid) | |
287 | { | |
288 | int tid; | |
289 | ||
290 | per_struct per_info; | |
291 | ptrace_area parea; | |
292 | ||
293 | CORE_ADDR watch_lo_addr = (CORE_ADDR)-1, watch_hi_addr = 0; | |
294 | struct watch_area *area; | |
295 | ||
296 | tid = TIDGET (ptid); | |
297 | if (tid == 0) | |
298 | tid = PIDGET (ptid); | |
299 | ||
300 | for (area = watch_base; area; area = area->next) | |
301 | { | |
302 | watch_lo_addr = min (watch_lo_addr, area->lo_addr); | |
303 | watch_hi_addr = max (watch_hi_addr, area->hi_addr); | |
304 | } | |
305 | ||
306 | parea.len = sizeof (per_info); | |
307 | parea.process_addr = (addr_t) & per_info; | |
308 | parea.kernel_addr = offsetof (struct user_regs_struct, per_info); | |
309 | if (ptrace (PTRACE_PEEKUSR_AREA, tid, &parea) < 0) | |
310 | perror_with_name (_("Couldn't retrieve watchpoint status")); | |
311 | ||
312 | if (watch_base) | |
313 | { | |
314 | per_info.control_regs.bits.em_storage_alteration = 1; | |
315 | per_info.control_regs.bits.storage_alt_space_ctl = 1; | |
316 | } | |
317 | else | |
318 | { | |
319 | per_info.control_regs.bits.em_storage_alteration = 0; | |
320 | per_info.control_regs.bits.storage_alt_space_ctl = 0; | |
321 | } | |
322 | per_info.starting_addr = watch_lo_addr; | |
323 | per_info.ending_addr = watch_hi_addr; | |
324 | ||
325 | if (ptrace (PTRACE_POKEUSR_AREA, tid, &parea) < 0) | |
326 | perror_with_name (_("Couldn't modify watchpoint status")); | |
327 | } | |
328 | ||
329 | static int | |
330 | s390_insert_watchpoint (CORE_ADDR addr, int len, int type) | |
331 | { | |
332 | struct lwp_info *lp; | |
333 | ptid_t ptid; | |
334 | struct watch_area *area = xmalloc (sizeof (struct watch_area)); | |
335 | ||
336 | if (!area) | |
337 | return -1; | |
338 | ||
339 | area->lo_addr = addr; | |
340 | area->hi_addr = addr + len - 1; | |
341 | ||
342 | area->next = watch_base; | |
343 | watch_base = area; | |
344 | ||
345 | ALL_LWPS (lp, ptid) | |
346 | s390_fix_watch_points (ptid); | |
347 | return 0; | |
348 | } | |
349 | ||
350 | static int | |
351 | s390_remove_watchpoint (CORE_ADDR addr, int len, int type) | |
352 | { | |
353 | struct lwp_info *lp; | |
354 | ptid_t ptid; | |
355 | struct watch_area *area, **parea; | |
356 | ||
357 | for (parea = &watch_base; *parea; parea = &(*parea)->next) | |
358 | if ((*parea)->lo_addr == addr | |
359 | && (*parea)->hi_addr == addr + len - 1) | |
360 | break; | |
361 | ||
362 | if (!*parea) | |
363 | { | |
364 | fprintf_unfiltered (gdb_stderr, | |
365 | "Attempt to remove nonexistent watchpoint.\n"); | |
366 | return -1; | |
367 | } | |
368 | ||
369 | area = *parea; | |
370 | *parea = area->next; | |
371 | xfree (area); | |
372 | ||
373 | ALL_LWPS (lp, ptid) | |
374 | s390_fix_watch_points (ptid); | |
375 | return 0; | |
376 | } | |
377 | ||
378 | static int | |
379 | s390_can_use_hw_breakpoint (int type, int cnt, int othertype) | |
380 | { | |
381 | return 1; | |
382 | } | |
383 | ||
384 | static int | |
385 | s390_region_ok_for_hw_watchpoint (CORE_ADDR addr, int cnt) | |
386 | { | |
387 | return 1; | |
388 | } | |
389 | ||
390 | ||
391 | void _initialize_s390_nat (void); | |
392 | ||
393 | void | |
394 | _initialize_s390_nat (void) | |
395 | { | |
396 | struct target_ops *t; | |
397 | ||
398 | /* Fill in the generic GNU/Linux methods. */ | |
399 | t = linux_target (); | |
400 | ||
401 | /* Add our register access methods. */ | |
402 | t->to_fetch_registers = s390_linux_fetch_inferior_registers; | |
403 | t->to_store_registers = s390_linux_store_inferior_registers; | |
404 | ||
405 | /* Add our watchpoint methods. */ | |
406 | t->to_can_use_hw_breakpoint = s390_can_use_hw_breakpoint; | |
407 | t->to_region_ok_for_hw_watchpoint = s390_region_ok_for_hw_watchpoint; | |
408 | t->to_have_continuable_watchpoint = 1; | |
409 | t->to_stopped_by_watchpoint = s390_stopped_by_watchpoint; | |
410 | t->to_insert_watchpoint = s390_insert_watchpoint; | |
411 | t->to_remove_watchpoint = s390_remove_watchpoint; | |
412 | ||
413 | /* Register the target. */ | |
414 | linux_nat_add_target (t); | |
415 | linux_nat_set_new_thread (t, s390_fix_watch_points); | |
416 | } |