Commit | Line | Data |
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5769d3cd | 1 | /* S390 native-dependent code for GDB, the GNU debugger. |
c9dd6fef WZ |
2 | Copyright (C) 2001, 2003, 2004, 2005, 2006 |
3 | Free Software Foundation, Inc | |
d0f54f9d | 4 | |
5769d3cd AC |
5 | Contributed by D.J. Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com) |
6 | for IBM Deutschland Entwicklung GmbH, IBM Corporation. | |
d0f54f9d | 7 | |
5769d3cd AC |
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 | |
a9762ec7 | 12 | the Free Software Foundation; either version 3 of the License, or |
5769d3cd AC |
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 | |
a9762ec7 | 21 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
5769d3cd AC |
22 | |
23 | #include "defs.h" | |
3ecc0ae2 | 24 | #include "regcache.h" |
d0f54f9d | 25 | #include "inferior.h" |
10d6c8cd DJ |
26 | #include "target.h" |
27 | #include "linux-nat.h" | |
d0f54f9d JB |
28 | |
29 | #include "s390-tdep.h" | |
30 | ||
5769d3cd AC |
31 | #include <asm/ptrace.h> |
32 | #include <sys/ptrace.h> | |
2d0c7962 | 33 | #include <asm/types.h> |
5769d3cd | 34 | #include <sys/procfs.h> |
5769d3cd | 35 | #include <sys/ucontext.h> |
5769d3cd AC |
36 | |
37 | ||
d0f54f9d JB |
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 | |
5769d3cd | 43 | #else |
d0f54f9d | 44 | #define regmap_gregset s390_regmap_gregset |
5769d3cd | 45 | #endif |
d0f54f9d JB |
46 | |
47 | #define regmap_fpregset s390_regmap_fpregset | |
48 | ||
9cbd5950 JB |
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(i) \ | |
819844ad | 54 | ((gdbarch_ptr_bit (current_gdbarch) == 32 \ |
9cbd5950 JB |
55 | && ((i) == S390_PSWA_REGNUM \ |
56 | || ((i) >= S390_R0_REGNUM && (i) <= S390_R15_REGNUM)))? 4 : 0) | |
57 | #else | |
58 | #define SUBOFF(i) 0 | |
59 | #endif | |
60 | ||
d0f54f9d JB |
61 | |
62 | /* Fill GDB's register array with the general-purpose register values | |
63 | in *REGP. */ | |
64 | void | |
7f7fe91e | 65 | supply_gregset (struct regcache *regcache, const gregset_t *regp) |
d0f54f9d JB |
66 | { |
67 | int i; | |
68 | for (i = 0; i < S390_NUM_REGS; i++) | |
69 | if (regmap_gregset[i] != -1) | |
7f7fe91e UW |
70 | regcache_raw_supply (regcache, i, |
71 | (const char *)regp + regmap_gregset[i] + SUBOFF (i)); | |
d0f54f9d JB |
72 | } |
73 | ||
74 | /* Fill register REGNO (if it is a general-purpose register) in | |
75 | *REGP with the value in GDB's register array. If REGNO is -1, | |
76 | do this for all registers. */ | |
77 | void | |
7f7fe91e | 78 | fill_gregset (const struct regcache *regcache, gregset_t *regp, int regno) |
d0f54f9d JB |
79 | { |
80 | int i; | |
81 | for (i = 0; i < S390_NUM_REGS; i++) | |
82 | if (regmap_gregset[i] != -1) | |
83 | if (regno == -1 || regno == i) | |
7f7fe91e | 84 | regcache_raw_collect (regcache, i, |
9cbd5950 | 85 | (char *)regp + regmap_gregset[i] + SUBOFF (i)); |
d0f54f9d JB |
86 | } |
87 | ||
88 | /* Fill GDB's register array with the floating-point register values | |
89 | in *REGP. */ | |
90 | void | |
7f7fe91e | 91 | supply_fpregset (struct regcache *regcache, const fpregset_t *regp) |
d0f54f9d JB |
92 | { |
93 | int i; | |
94 | for (i = 0; i < S390_NUM_REGS; i++) | |
95 | if (regmap_fpregset[i] != -1) | |
7f7fe91e UW |
96 | regcache_raw_supply (regcache, i, |
97 | (const char *)regp + regmap_fpregset[i]); | |
d0f54f9d JB |
98 | } |
99 | ||
100 | /* Fill register REGNO (if it is a general-purpose register) in | |
101 | *REGP with the value in GDB's register array. If REGNO is -1, | |
102 | do this for all registers. */ | |
103 | void | |
7f7fe91e | 104 | fill_fpregset (const struct regcache *regcache, fpregset_t *regp, int regno) |
d0f54f9d JB |
105 | { |
106 | int i; | |
107 | for (i = 0; i < S390_NUM_REGS; i++) | |
108 | if (regmap_fpregset[i] != -1) | |
109 | if (regno == -1 || regno == i) | |
7f7fe91e UW |
110 | regcache_raw_collect (regcache, i, |
111 | (char *)regp + regmap_fpregset[i]); | |
d0f54f9d JB |
112 | } |
113 | ||
114 | /* Find the TID for the current inferior thread to use with ptrace. */ | |
115 | static int | |
116 | s390_inferior_tid (void) | |
117 | { | |
118 | /* GNU/Linux LWP ID's are process ID's. */ | |
119 | int tid = TIDGET (inferior_ptid); | |
120 | if (tid == 0) | |
121 | tid = PIDGET (inferior_ptid); /* Not a threaded program. */ | |
122 | ||
123 | return tid; | |
124 | } | |
125 | ||
126 | /* Fetch all general-purpose registers from process/thread TID and | |
127 | store their values in GDB's register cache. */ | |
128 | static void | |
56be3814 | 129 | fetch_regs (struct regcache *regcache, int tid) |
d0f54f9d JB |
130 | { |
131 | gregset_t regs; | |
132 | ptrace_area parea; | |
133 | ||
134 | parea.len = sizeof (regs); | |
135 | parea.process_addr = (addr_t) ®s; | |
136 | parea.kernel_addr = offsetof (struct user_regs_struct, psw); | |
137 | if (ptrace (PTRACE_PEEKUSR_AREA, tid, (long) &parea) < 0) | |
e2e0b3e5 | 138 | perror_with_name (_("Couldn't get registers")); |
d0f54f9d | 139 | |
56be3814 | 140 | supply_gregset (regcache, (const gregset_t *) ®s); |
d0f54f9d JB |
141 | } |
142 | ||
143 | /* Store all valid general-purpose registers in GDB's register cache | |
144 | into the process/thread specified by TID. */ | |
145 | static void | |
56be3814 | 146 | store_regs (const struct regcache *regcache, int tid, int regnum) |
d0f54f9d JB |
147 | { |
148 | gregset_t regs; | |
149 | ptrace_area parea; | |
150 | ||
151 | parea.len = sizeof (regs); | |
152 | parea.process_addr = (addr_t) ®s; | |
153 | parea.kernel_addr = offsetof (struct user_regs_struct, psw); | |
154 | if (ptrace (PTRACE_PEEKUSR_AREA, tid, (long) &parea) < 0) | |
e2e0b3e5 | 155 | perror_with_name (_("Couldn't get registers")); |
d0f54f9d | 156 | |
56be3814 | 157 | fill_gregset (regcache, ®s, regnum); |
d0f54f9d JB |
158 | |
159 | if (ptrace (PTRACE_POKEUSR_AREA, tid, (long) &parea) < 0) | |
e2e0b3e5 | 160 | perror_with_name (_("Couldn't write registers")); |
d0f54f9d JB |
161 | } |
162 | ||
163 | /* Fetch all floating-point registers from process/thread TID and store | |
164 | their values in GDB's register cache. */ | |
165 | static void | |
56be3814 | 166 | fetch_fpregs (struct regcache *regcache, int tid) |
d0f54f9d JB |
167 | { |
168 | fpregset_t fpregs; | |
169 | ptrace_area parea; | |
170 | ||
171 | parea.len = sizeof (fpregs); | |
172 | parea.process_addr = (addr_t) &fpregs; | |
173 | parea.kernel_addr = offsetof (struct user_regs_struct, fp_regs); | |
174 | if (ptrace (PTRACE_PEEKUSR_AREA, tid, (long) &parea) < 0) | |
e2e0b3e5 | 175 | perror_with_name (_("Couldn't get floating point status")); |
d0f54f9d | 176 | |
56be3814 | 177 | supply_fpregset (regcache, (const fpregset_t *) &fpregs); |
d0f54f9d JB |
178 | } |
179 | ||
180 | /* Store all valid floating-point registers in GDB's register cache | |
181 | into the process/thread specified by TID. */ | |
182 | static void | |
56be3814 | 183 | store_fpregs (const struct regcache *regcache, int tid, int regnum) |
d0f54f9d JB |
184 | { |
185 | fpregset_t fpregs; | |
186 | ptrace_area parea; | |
187 | ||
188 | parea.len = sizeof (fpregs); | |
189 | parea.process_addr = (addr_t) &fpregs; | |
190 | parea.kernel_addr = offsetof (struct user_regs_struct, fp_regs); | |
191 | if (ptrace (PTRACE_PEEKUSR_AREA, tid, (long) &parea) < 0) | |
e2e0b3e5 | 192 | perror_with_name (_("Couldn't get floating point status")); |
d0f54f9d | 193 | |
56be3814 | 194 | fill_fpregset (regcache, &fpregs, regnum); |
d0f54f9d JB |
195 | |
196 | if (ptrace (PTRACE_POKEUSR_AREA, tid, (long) &parea) < 0) | |
e2e0b3e5 | 197 | perror_with_name (_("Couldn't write floating point status")); |
d0f54f9d JB |
198 | } |
199 | ||
200 | /* Fetch register REGNUM from the child process. If REGNUM is -1, do | |
201 | this for all registers. */ | |
10d6c8cd | 202 | static void |
56be3814 | 203 | s390_linux_fetch_inferior_registers (struct regcache *regcache, int regnum) |
d0f54f9d JB |
204 | { |
205 | int tid = s390_inferior_tid (); | |
206 | ||
207 | if (regnum == -1 | |
208 | || (regnum < S390_NUM_REGS && regmap_gregset[regnum] != -1)) | |
56be3814 | 209 | fetch_regs (regcache, tid); |
d0f54f9d JB |
210 | |
211 | if (regnum == -1 | |
212 | || (regnum < S390_NUM_REGS && regmap_fpregset[regnum] != -1)) | |
56be3814 | 213 | fetch_fpregs (regcache, tid); |
d0f54f9d JB |
214 | } |
215 | ||
216 | /* Store register REGNUM back into the child process. If REGNUM is | |
217 | -1, do this for all registers. */ | |
10d6c8cd | 218 | static void |
56be3814 | 219 | s390_linux_store_inferior_registers (struct regcache *regcache, int regnum) |
d0f54f9d JB |
220 | { |
221 | int tid = s390_inferior_tid (); | |
222 | ||
223 | if (regnum == -1 | |
224 | || (regnum < S390_NUM_REGS && regmap_gregset[regnum] != -1)) | |
56be3814 | 225 | store_regs (regcache, tid, regnum); |
d0f54f9d JB |
226 | |
227 | if (regnum == -1 | |
228 | || (regnum < S390_NUM_REGS && regmap_fpregset[regnum] != -1)) | |
56be3814 | 229 | store_fpregs (regcache, tid, regnum); |
5769d3cd AC |
230 | } |
231 | ||
d0f54f9d | 232 | |
e1457d83 JB |
233 | /* Hardware-assisted watchpoint handling. */ |
234 | ||
235 | /* We maintain a list of all currently active watchpoints in order | |
236 | to properly handle watchpoint removal. | |
237 | ||
238 | The only thing we actually need is the total address space area | |
239 | spanned by the watchpoints. */ | |
240 | ||
5769d3cd AC |
241 | struct watch_area |
242 | { | |
e1457d83 | 243 | struct watch_area *next; |
5769d3cd AC |
244 | CORE_ADDR lo_addr; |
245 | CORE_ADDR hi_addr; | |
246 | }; | |
247 | ||
e1457d83 | 248 | static struct watch_area *watch_base = NULL; |
5769d3cd | 249 | |
fd7979d1 | 250 | static int |
e1457d83 | 251 | s390_stopped_by_watchpoint (void) |
5769d3cd AC |
252 | { |
253 | per_lowcore_bits per_lowcore; | |
254 | ptrace_area parea; | |
9f0bdab8 | 255 | int result; |
5769d3cd | 256 | |
e1457d83 JB |
257 | /* Speed up common case. */ |
258 | if (!watch_base) | |
259 | return 0; | |
260 | ||
5769d3cd AC |
261 | parea.len = sizeof (per_lowcore); |
262 | parea.process_addr = (addr_t) & per_lowcore; | |
263 | parea.kernel_addr = offsetof (struct user_regs_struct, per_info.lowcore); | |
e1457d83 | 264 | if (ptrace (PTRACE_PEEKUSR_AREA, s390_inferior_tid (), &parea) < 0) |
e2e0b3e5 | 265 | perror_with_name (_("Couldn't retrieve watchpoint status")); |
5769d3cd | 266 | |
9f0bdab8 DJ |
267 | result = (per_lowcore.perc_storage_alteration == 1 |
268 | && per_lowcore.perc_store_real_address == 0); | |
269 | ||
270 | if (result) | |
271 | { | |
272 | /* Do not report this watchpoint again. */ | |
273 | memset (&per_lowcore, 0, sizeof (per_lowcore)); | |
274 | if (ptrace (PTRACE_POKEUSR_AREA, s390_inferior_tid (), &parea) < 0) | |
275 | perror_with_name (_("Couldn't clear watchpoint status")); | |
276 | } | |
277 | ||
278 | return result; | |
e1457d83 | 279 | } |
5769d3cd | 280 | |
e1457d83 | 281 | static void |
9f0bdab8 | 282 | s390_fix_watch_points (ptid_t ptid) |
5769d3cd | 283 | { |
9f0bdab8 | 284 | int tid; |
e1457d83 | 285 | |
5769d3cd AC |
286 | per_struct per_info; |
287 | ptrace_area parea; | |
288 | ||
e1457d83 JB |
289 | CORE_ADDR watch_lo_addr = (CORE_ADDR)-1, watch_hi_addr = 0; |
290 | struct watch_area *area; | |
291 | ||
9f0bdab8 DJ |
292 | tid = TIDGET (ptid); |
293 | if (tid == 0) | |
294 | tid = PIDGET (ptid); | |
295 | ||
e1457d83 JB |
296 | for (area = watch_base; area; area = area->next) |
297 | { | |
298 | watch_lo_addr = min (watch_lo_addr, area->lo_addr); | |
299 | watch_hi_addr = max (watch_hi_addr, area->hi_addr); | |
300 | } | |
301 | ||
5769d3cd AC |
302 | parea.len = sizeof (per_info); |
303 | parea.process_addr = (addr_t) & per_info; | |
e1457d83 JB |
304 | parea.kernel_addr = offsetof (struct user_regs_struct, per_info); |
305 | if (ptrace (PTRACE_PEEKUSR_AREA, tid, &parea) < 0) | |
e2e0b3e5 | 306 | perror_with_name (_("Couldn't retrieve watchpoint status")); |
e1457d83 JB |
307 | |
308 | if (watch_base) | |
5769d3cd AC |
309 | { |
310 | per_info.control_regs.bits.em_storage_alteration = 1; | |
311 | per_info.control_regs.bits.storage_alt_space_ctl = 1; | |
312 | } | |
313 | else | |
314 | { | |
315 | per_info.control_regs.bits.em_storage_alteration = 0; | |
316 | per_info.control_regs.bits.storage_alt_space_ctl = 0; | |
317 | } | |
318 | per_info.starting_addr = watch_lo_addr; | |
319 | per_info.ending_addr = watch_hi_addr; | |
e1457d83 JB |
320 | |
321 | if (ptrace (PTRACE_POKEUSR_AREA, tid, &parea) < 0) | |
e2e0b3e5 | 322 | perror_with_name (_("Couldn't modify watchpoint status")); |
5769d3cd AC |
323 | } |
324 | ||
fd7979d1 | 325 | static int |
2f00de94 | 326 | s390_insert_watchpoint (CORE_ADDR addr, int len, int type) |
5769d3cd | 327 | { |
9f0bdab8 DJ |
328 | struct lwp_info *lp; |
329 | ptid_t ptid; | |
e1457d83 | 330 | struct watch_area *area = xmalloc (sizeof (struct watch_area)); |
9f0bdab8 | 331 | |
e1457d83 JB |
332 | if (!area) |
333 | return -1; | |
334 | ||
335 | area->lo_addr = addr; | |
336 | area->hi_addr = addr + len - 1; | |
337 | ||
338 | area->next = watch_base; | |
339 | watch_base = area; | |
340 | ||
9f0bdab8 DJ |
341 | ALL_LWPS (lp, ptid) |
342 | s390_fix_watch_points (ptid); | |
e1457d83 | 343 | return 0; |
5769d3cd AC |
344 | } |
345 | ||
fd7979d1 | 346 | static int |
2f00de94 | 347 | s390_remove_watchpoint (CORE_ADDR addr, int len, int type) |
5769d3cd | 348 | { |
9f0bdab8 DJ |
349 | struct lwp_info *lp; |
350 | ptid_t ptid; | |
e1457d83 JB |
351 | struct watch_area *area, **parea; |
352 | ||
353 | for (parea = &watch_base; *parea; parea = &(*parea)->next) | |
354 | if ((*parea)->lo_addr == addr | |
355 | && (*parea)->hi_addr == addr + len - 1) | |
356 | break; | |
357 | ||
358 | if (!*parea) | |
5769d3cd AC |
359 | { |
360 | fprintf_unfiltered (gdb_stderr, | |
e1457d83 | 361 | "Attempt to remove nonexistent watchpoint.\n"); |
5769d3cd AC |
362 | return -1; |
363 | } | |
e1457d83 JB |
364 | |
365 | area = *parea; | |
366 | *parea = area->next; | |
367 | xfree (area); | |
368 | ||
9f0bdab8 DJ |
369 | ALL_LWPS (lp, ptid) |
370 | s390_fix_watch_points (ptid); | |
e1457d83 | 371 | return 0; |
5769d3cd AC |
372 | } |
373 | ||
fd7979d1 UW |
374 | static int |
375 | s390_can_use_hw_breakpoint (int type, int cnt, int othertype) | |
376 | { | |
377 | return 1; | |
378 | } | |
e1457d83 | 379 | |
fd7979d1 | 380 | static int |
2a3cdf79 | 381 | s390_region_ok_for_hw_watchpoint (CORE_ADDR addr, int cnt) |
5769d3cd | 382 | { |
fd7979d1 | 383 | return 1; |
5769d3cd AC |
384 | } |
385 | ||
fd7979d1 | 386 | |
10d6c8cd DJ |
387 | void _initialize_s390_nat (void); |
388 | ||
389 | void | |
390 | _initialize_s390_nat (void) | |
391 | { | |
392 | struct target_ops *t; | |
393 | ||
394 | /* Fill in the generic GNU/Linux methods. */ | |
395 | t = linux_target (); | |
396 | ||
397 | /* Add our register access methods. */ | |
398 | t->to_fetch_registers = s390_linux_fetch_inferior_registers; | |
399 | t->to_store_registers = s390_linux_store_inferior_registers; | |
400 | ||
fd7979d1 UW |
401 | /* Add our watchpoint methods. */ |
402 | t->to_can_use_hw_breakpoint = s390_can_use_hw_breakpoint; | |
2a3cdf79 | 403 | t->to_region_ok_for_hw_watchpoint = s390_region_ok_for_hw_watchpoint; |
fd7979d1 UW |
404 | t->to_have_continuable_watchpoint = 1; |
405 | t->to_stopped_by_watchpoint = s390_stopped_by_watchpoint; | |
406 | t->to_insert_watchpoint = s390_insert_watchpoint; | |
407 | t->to_remove_watchpoint = s390_remove_watchpoint; | |
408 | ||
10d6c8cd | 409 | /* Register the target. */ |
f973ed9c | 410 | linux_nat_add_target (t); |
9f0bdab8 | 411 | linux_nat_set_new_thread (t, s390_fix_watch_points); |
10d6c8cd | 412 | } |