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5769d3cd | 1 | /* S390 native-dependent code for GDB, the GNU debugger. |
1e061d1a | 2 | Copyright (C) 2001, 2003, 2004, 2005, 2006, 2007, 2009 |
c9dd6fef | 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" | |
7803799a | 28 | #include "auxv.h" |
d0f54f9d JB |
29 | |
30 | #include "s390-tdep.h" | |
31 | ||
5769d3cd AC |
32 | #include <asm/ptrace.h> |
33 | #include <sys/ptrace.h> | |
2d0c7962 | 34 | #include <asm/types.h> |
5769d3cd | 35 | #include <sys/procfs.h> |
5769d3cd | 36 | #include <sys/ucontext.h> |
7803799a UW |
37 | #include <elf.h> |
38 | ||
39 | #ifndef HWCAP_S390_HIGH_GPRS | |
40 | #define HWCAP_S390_HIGH_GPRS 512 | |
41 | #endif | |
5769d3cd AC |
42 | |
43 | ||
d0f54f9d JB |
44 | /* Map registers to gregset/ptrace offsets. |
45 | These arrays are defined in s390-tdep.c. */ | |
46 | ||
47 | #ifdef __s390x__ | |
48 | #define regmap_gregset s390x_regmap_gregset | |
5769d3cd | 49 | #else |
d0f54f9d | 50 | #define regmap_gregset s390_regmap_gregset |
5769d3cd | 51 | #endif |
d0f54f9d JB |
52 | |
53 | #define regmap_fpregset s390_regmap_fpregset | |
54 | ||
9cbd5950 JB |
55 | /* When debugging a 32-bit executable running under a 64-bit kernel, |
56 | we have to fix up the 64-bit registers we get from the kernel | |
57 | to make them look like 32-bit registers. */ | |
d6db1fab UW |
58 | |
59 | static void | |
60 | s390_native_supply (struct regcache *regcache, int regno, | |
61 | const gdb_byte *regp, int *regmap) | |
62 | { | |
63 | int offset = regmap[regno]; | |
64 | ||
9cbd5950 | 65 | #ifdef __s390x__ |
d6db1fab UW |
66 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
67 | if (offset != -1 && gdbarch_ptr_bit (gdbarch) == 32) | |
68 | { | |
69 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); | |
70 | ||
71 | if (regno == S390_PSWM_REGNUM) | |
72 | { | |
73 | ULONGEST pswm; | |
74 | gdb_byte buf[4]; | |
75 | ||
76 | pswm = extract_unsigned_integer (regp + regmap[S390_PSWM_REGNUM], | |
77 | 8, byte_order); | |
78 | ||
79 | store_unsigned_integer (buf, 4, byte_order, (pswm >> 32) | 0x80000); | |
80 | regcache_raw_supply (regcache, regno, buf); | |
81 | return; | |
82 | } | |
83 | ||
84 | if (regno == S390_PSWA_REGNUM) | |
85 | { | |
86 | ULONGEST pswm, pswa; | |
87 | gdb_byte buf[4]; | |
88 | ||
89 | pswa = extract_unsigned_integer (regp + regmap[S390_PSWA_REGNUM], | |
90 | 8, byte_order); | |
91 | pswm = extract_unsigned_integer (regp + regmap[S390_PSWM_REGNUM], | |
92 | 8, byte_order); | |
93 | ||
94 | store_unsigned_integer (buf, 4, byte_order, | |
95 | (pswa & 0x7fffffff) | (pswm & 0x80000000)); | |
96 | regcache_raw_supply (regcache, regno, buf); | |
97 | return; | |
98 | } | |
99 | ||
100 | if (regno >= S390_R0_REGNUM && regno <= S390_R15_REGNUM) | |
101 | offset += 4; | |
102 | } | |
103 | #endif | |
104 | ||
105 | if (offset != -1) | |
106 | regcache_raw_supply (regcache, regno, regp + offset); | |
107 | } | |
108 | ||
109 | static void | |
110 | s390_native_collect (const struct regcache *regcache, int regno, | |
111 | gdb_byte *regp, int *regmap) | |
112 | { | |
113 | int offset = regmap[regno]; | |
114 | ||
115 | #ifdef __s390x__ | |
116 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
117 | if (offset != -1 && gdbarch_ptr_bit (gdbarch) == 32) | |
118 | { | |
119 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); | |
120 | ||
121 | if (regno == S390_PSWM_REGNUM) | |
122 | { | |
123 | ULONGEST pswm; | |
124 | gdb_byte buf[4]; | |
125 | ||
126 | regcache_raw_collect (regcache, regno, buf); | |
127 | pswm = extract_unsigned_integer (buf, 4, byte_order); | |
128 | ||
129 | /* We don't know the final addressing mode until the PSW address | |
130 | is known, so leave it as-is. When the PSW address is collected | |
131 | (below), the addressing mode will be updated. */ | |
132 | store_unsigned_integer (regp + regmap[S390_PSWM_REGNUM], | |
133 | 4, byte_order, pswm & 0xfff7ffff); | |
134 | return; | |
135 | } | |
136 | ||
137 | if (regno == S390_PSWA_REGNUM) | |
138 | { | |
139 | ULONGEST pswa; | |
140 | gdb_byte buf[4]; | |
141 | ||
142 | regcache_raw_collect (regcache, regno, buf); | |
143 | pswa = extract_unsigned_integer (buf, 4, byte_order); | |
144 | ||
145 | store_unsigned_integer (regp + regmap[S390_PSWA_REGNUM], | |
146 | 8, byte_order, pswa & 0x7fffffff); | |
147 | ||
148 | /* Update basic addressing mode bit in PSW mask, see above. */ | |
149 | store_unsigned_integer (regp + regmap[S390_PSWM_REGNUM] + 4, | |
150 | 4, byte_order, pswa & 0x80000000); | |
151 | return; | |
152 | } | |
153 | ||
154 | if (regno >= S390_R0_REGNUM && regno <= S390_R15_REGNUM) | |
155 | { | |
156 | memset (regp + offset, 0, 4); | |
157 | offset += 4; | |
158 | } | |
159 | } | |
9cbd5950 JB |
160 | #endif |
161 | ||
d6db1fab UW |
162 | if (offset != -1) |
163 | regcache_raw_collect (regcache, regno, regp + offset); | |
164 | } | |
d0f54f9d JB |
165 | |
166 | /* Fill GDB's register array with the general-purpose register values | |
167 | in *REGP. */ | |
168 | void | |
7f7fe91e | 169 | supply_gregset (struct regcache *regcache, const gregset_t *regp) |
d0f54f9d JB |
170 | { |
171 | int i; | |
172 | for (i = 0; i < S390_NUM_REGS; i++) | |
d6db1fab | 173 | s390_native_supply (regcache, i, (const gdb_byte *) regp, regmap_gregset); |
d0f54f9d JB |
174 | } |
175 | ||
176 | /* Fill register REGNO (if it is a general-purpose register) in | |
177 | *REGP with the value in GDB's register array. If REGNO is -1, | |
178 | do this for all registers. */ | |
179 | void | |
7f7fe91e | 180 | fill_gregset (const struct regcache *regcache, gregset_t *regp, int regno) |
d0f54f9d JB |
181 | { |
182 | int i; | |
183 | for (i = 0; i < S390_NUM_REGS; i++) | |
d6db1fab UW |
184 | if (regno == -1 || regno == i) |
185 | s390_native_collect (regcache, i, (gdb_byte *) regp, regmap_gregset); | |
d0f54f9d JB |
186 | } |
187 | ||
188 | /* Fill GDB's register array with the floating-point register values | |
189 | in *REGP. */ | |
190 | void | |
7f7fe91e | 191 | supply_fpregset (struct regcache *regcache, const fpregset_t *regp) |
d0f54f9d JB |
192 | { |
193 | int i; | |
194 | for (i = 0; i < S390_NUM_REGS; i++) | |
d6db1fab | 195 | s390_native_supply (regcache, i, (const gdb_byte *) regp, regmap_fpregset); |
d0f54f9d JB |
196 | } |
197 | ||
198 | /* Fill register REGNO (if it is a general-purpose register) in | |
199 | *REGP with the value in GDB's register array. If REGNO is -1, | |
200 | do this for all registers. */ | |
201 | void | |
7f7fe91e | 202 | fill_fpregset (const struct regcache *regcache, fpregset_t *regp, int regno) |
d0f54f9d JB |
203 | { |
204 | int i; | |
205 | for (i = 0; i < S390_NUM_REGS; i++) | |
d6db1fab UW |
206 | if (regno == -1 || regno == i) |
207 | s390_native_collect (regcache, i, (gdb_byte *) regp, regmap_fpregset); | |
d0f54f9d JB |
208 | } |
209 | ||
210 | /* Find the TID for the current inferior thread to use with ptrace. */ | |
211 | static int | |
212 | s390_inferior_tid (void) | |
213 | { | |
214 | /* GNU/Linux LWP ID's are process ID's. */ | |
215 | int tid = TIDGET (inferior_ptid); | |
216 | if (tid == 0) | |
217 | tid = PIDGET (inferior_ptid); /* Not a threaded program. */ | |
218 | ||
219 | return tid; | |
220 | } | |
221 | ||
222 | /* Fetch all general-purpose registers from process/thread TID and | |
223 | store their values in GDB's register cache. */ | |
224 | static void | |
56be3814 | 225 | fetch_regs (struct regcache *regcache, int tid) |
d0f54f9d JB |
226 | { |
227 | gregset_t regs; | |
228 | ptrace_area parea; | |
229 | ||
230 | parea.len = sizeof (regs); | |
231 | parea.process_addr = (addr_t) ®s; | |
232 | parea.kernel_addr = offsetof (struct user_regs_struct, psw); | |
233 | if (ptrace (PTRACE_PEEKUSR_AREA, tid, (long) &parea) < 0) | |
e2e0b3e5 | 234 | perror_with_name (_("Couldn't get registers")); |
d0f54f9d | 235 | |
56be3814 | 236 | supply_gregset (regcache, (const gregset_t *) ®s); |
d0f54f9d JB |
237 | } |
238 | ||
239 | /* Store all valid general-purpose registers in GDB's register cache | |
240 | into the process/thread specified by TID. */ | |
241 | static void | |
56be3814 | 242 | store_regs (const struct regcache *regcache, int tid, int regnum) |
d0f54f9d JB |
243 | { |
244 | gregset_t regs; | |
245 | ptrace_area parea; | |
246 | ||
247 | parea.len = sizeof (regs); | |
248 | parea.process_addr = (addr_t) ®s; | |
249 | parea.kernel_addr = offsetof (struct user_regs_struct, psw); | |
250 | if (ptrace (PTRACE_PEEKUSR_AREA, tid, (long) &parea) < 0) | |
e2e0b3e5 | 251 | perror_with_name (_("Couldn't get registers")); |
d0f54f9d | 252 | |
56be3814 | 253 | fill_gregset (regcache, ®s, regnum); |
d0f54f9d JB |
254 | |
255 | if (ptrace (PTRACE_POKEUSR_AREA, tid, (long) &parea) < 0) | |
e2e0b3e5 | 256 | perror_with_name (_("Couldn't write registers")); |
d0f54f9d JB |
257 | } |
258 | ||
259 | /* Fetch all floating-point registers from process/thread TID and store | |
260 | their values in GDB's register cache. */ | |
261 | static void | |
56be3814 | 262 | fetch_fpregs (struct regcache *regcache, int tid) |
d0f54f9d JB |
263 | { |
264 | fpregset_t fpregs; | |
265 | ptrace_area parea; | |
266 | ||
267 | parea.len = sizeof (fpregs); | |
268 | parea.process_addr = (addr_t) &fpregs; | |
269 | parea.kernel_addr = offsetof (struct user_regs_struct, fp_regs); | |
270 | if (ptrace (PTRACE_PEEKUSR_AREA, tid, (long) &parea) < 0) | |
e2e0b3e5 | 271 | perror_with_name (_("Couldn't get floating point status")); |
d0f54f9d | 272 | |
56be3814 | 273 | supply_fpregset (regcache, (const fpregset_t *) &fpregs); |
d0f54f9d JB |
274 | } |
275 | ||
276 | /* Store all valid floating-point registers in GDB's register cache | |
277 | into the process/thread specified by TID. */ | |
278 | static void | |
56be3814 | 279 | store_fpregs (const struct regcache *regcache, int tid, int regnum) |
d0f54f9d JB |
280 | { |
281 | fpregset_t fpregs; | |
282 | ptrace_area parea; | |
283 | ||
284 | parea.len = sizeof (fpregs); | |
285 | parea.process_addr = (addr_t) &fpregs; | |
286 | parea.kernel_addr = offsetof (struct user_regs_struct, fp_regs); | |
287 | if (ptrace (PTRACE_PEEKUSR_AREA, tid, (long) &parea) < 0) | |
e2e0b3e5 | 288 | perror_with_name (_("Couldn't get floating point status")); |
d0f54f9d | 289 | |
56be3814 | 290 | fill_fpregset (regcache, &fpregs, regnum); |
d0f54f9d JB |
291 | |
292 | if (ptrace (PTRACE_POKEUSR_AREA, tid, (long) &parea) < 0) | |
e2e0b3e5 | 293 | perror_with_name (_("Couldn't write floating point status")); |
d0f54f9d JB |
294 | } |
295 | ||
296 | /* Fetch register REGNUM from the child process. If REGNUM is -1, do | |
297 | this for all registers. */ | |
10d6c8cd | 298 | static void |
28439f5e PA |
299 | s390_linux_fetch_inferior_registers (struct target_ops *ops, |
300 | struct regcache *regcache, int regnum) | |
d0f54f9d JB |
301 | { |
302 | int tid = s390_inferior_tid (); | |
303 | ||
304 | if (regnum == -1 | |
305 | || (regnum < S390_NUM_REGS && regmap_gregset[regnum] != -1)) | |
56be3814 | 306 | fetch_regs (regcache, tid); |
d0f54f9d JB |
307 | |
308 | if (regnum == -1 | |
309 | || (regnum < S390_NUM_REGS && regmap_fpregset[regnum] != -1)) | |
56be3814 | 310 | fetch_fpregs (regcache, tid); |
d0f54f9d JB |
311 | } |
312 | ||
313 | /* Store register REGNUM back into the child process. If REGNUM is | |
314 | -1, do this for all registers. */ | |
10d6c8cd | 315 | static void |
28439f5e PA |
316 | s390_linux_store_inferior_registers (struct target_ops *ops, |
317 | struct regcache *regcache, int regnum) | |
d0f54f9d JB |
318 | { |
319 | int tid = s390_inferior_tid (); | |
320 | ||
321 | if (regnum == -1 | |
322 | || (regnum < S390_NUM_REGS && regmap_gregset[regnum] != -1)) | |
56be3814 | 323 | store_regs (regcache, tid, regnum); |
d0f54f9d JB |
324 | |
325 | if (regnum == -1 | |
326 | || (regnum < S390_NUM_REGS && regmap_fpregset[regnum] != -1)) | |
56be3814 | 327 | store_fpregs (regcache, tid, regnum); |
5769d3cd AC |
328 | } |
329 | ||
d0f54f9d | 330 | |
e1457d83 JB |
331 | /* Hardware-assisted watchpoint handling. */ |
332 | ||
333 | /* We maintain a list of all currently active watchpoints in order | |
334 | to properly handle watchpoint removal. | |
335 | ||
336 | The only thing we actually need is the total address space area | |
337 | spanned by the watchpoints. */ | |
338 | ||
5769d3cd AC |
339 | struct watch_area |
340 | { | |
e1457d83 | 341 | struct watch_area *next; |
5769d3cd AC |
342 | CORE_ADDR lo_addr; |
343 | CORE_ADDR hi_addr; | |
344 | }; | |
345 | ||
e1457d83 | 346 | static struct watch_area *watch_base = NULL; |
5769d3cd | 347 | |
fd7979d1 | 348 | static int |
e1457d83 | 349 | s390_stopped_by_watchpoint (void) |
5769d3cd AC |
350 | { |
351 | per_lowcore_bits per_lowcore; | |
352 | ptrace_area parea; | |
9f0bdab8 | 353 | int result; |
5769d3cd | 354 | |
e1457d83 JB |
355 | /* Speed up common case. */ |
356 | if (!watch_base) | |
357 | return 0; | |
358 | ||
5769d3cd AC |
359 | parea.len = sizeof (per_lowcore); |
360 | parea.process_addr = (addr_t) & per_lowcore; | |
361 | parea.kernel_addr = offsetof (struct user_regs_struct, per_info.lowcore); | |
e1457d83 | 362 | if (ptrace (PTRACE_PEEKUSR_AREA, s390_inferior_tid (), &parea) < 0) |
e2e0b3e5 | 363 | perror_with_name (_("Couldn't retrieve watchpoint status")); |
5769d3cd | 364 | |
9f0bdab8 DJ |
365 | result = (per_lowcore.perc_storage_alteration == 1 |
366 | && per_lowcore.perc_store_real_address == 0); | |
367 | ||
368 | if (result) | |
369 | { | |
370 | /* Do not report this watchpoint again. */ | |
371 | memset (&per_lowcore, 0, sizeof (per_lowcore)); | |
372 | if (ptrace (PTRACE_POKEUSR_AREA, s390_inferior_tid (), &parea) < 0) | |
373 | perror_with_name (_("Couldn't clear watchpoint status")); | |
374 | } | |
375 | ||
376 | return result; | |
e1457d83 | 377 | } |
5769d3cd | 378 | |
e1457d83 | 379 | static void |
9f0bdab8 | 380 | s390_fix_watch_points (ptid_t ptid) |
5769d3cd | 381 | { |
9f0bdab8 | 382 | int tid; |
e1457d83 | 383 | |
5769d3cd AC |
384 | per_struct per_info; |
385 | ptrace_area parea; | |
386 | ||
e1457d83 JB |
387 | CORE_ADDR watch_lo_addr = (CORE_ADDR)-1, watch_hi_addr = 0; |
388 | struct watch_area *area; | |
389 | ||
9f0bdab8 DJ |
390 | tid = TIDGET (ptid); |
391 | if (tid == 0) | |
392 | tid = PIDGET (ptid); | |
393 | ||
e1457d83 JB |
394 | for (area = watch_base; area; area = area->next) |
395 | { | |
396 | watch_lo_addr = min (watch_lo_addr, area->lo_addr); | |
397 | watch_hi_addr = max (watch_hi_addr, area->hi_addr); | |
398 | } | |
399 | ||
5769d3cd AC |
400 | parea.len = sizeof (per_info); |
401 | parea.process_addr = (addr_t) & per_info; | |
e1457d83 JB |
402 | parea.kernel_addr = offsetof (struct user_regs_struct, per_info); |
403 | if (ptrace (PTRACE_PEEKUSR_AREA, tid, &parea) < 0) | |
e2e0b3e5 | 404 | perror_with_name (_("Couldn't retrieve watchpoint status")); |
e1457d83 JB |
405 | |
406 | if (watch_base) | |
5769d3cd AC |
407 | { |
408 | per_info.control_regs.bits.em_storage_alteration = 1; | |
409 | per_info.control_regs.bits.storage_alt_space_ctl = 1; | |
410 | } | |
411 | else | |
412 | { | |
413 | per_info.control_regs.bits.em_storage_alteration = 0; | |
414 | per_info.control_regs.bits.storage_alt_space_ctl = 0; | |
415 | } | |
416 | per_info.starting_addr = watch_lo_addr; | |
417 | per_info.ending_addr = watch_hi_addr; | |
e1457d83 JB |
418 | |
419 | if (ptrace (PTRACE_POKEUSR_AREA, tid, &parea) < 0) | |
e2e0b3e5 | 420 | perror_with_name (_("Couldn't modify watchpoint status")); |
5769d3cd AC |
421 | } |
422 | ||
fd7979d1 | 423 | static int |
0cf6dd15 TJB |
424 | s390_insert_watchpoint (CORE_ADDR addr, int len, int type, |
425 | struct expression *cond) | |
5769d3cd | 426 | { |
9f0bdab8 | 427 | struct lwp_info *lp; |
e1457d83 | 428 | struct watch_area *area = xmalloc (sizeof (struct watch_area)); |
9f0bdab8 | 429 | |
e1457d83 JB |
430 | if (!area) |
431 | return -1; | |
432 | ||
433 | area->lo_addr = addr; | |
434 | area->hi_addr = addr + len - 1; | |
435 | ||
436 | area->next = watch_base; | |
437 | watch_base = area; | |
438 | ||
4c38200f PA |
439 | ALL_LWPS (lp) |
440 | s390_fix_watch_points (lp->ptid); | |
e1457d83 | 441 | return 0; |
5769d3cd AC |
442 | } |
443 | ||
fd7979d1 | 444 | static int |
0cf6dd15 TJB |
445 | s390_remove_watchpoint (CORE_ADDR addr, int len, int type, |
446 | struct expression *cond) | |
5769d3cd | 447 | { |
9f0bdab8 | 448 | struct lwp_info *lp; |
e1457d83 JB |
449 | struct watch_area *area, **parea; |
450 | ||
451 | for (parea = &watch_base; *parea; parea = &(*parea)->next) | |
452 | if ((*parea)->lo_addr == addr | |
453 | && (*parea)->hi_addr == addr + len - 1) | |
454 | break; | |
455 | ||
456 | if (!*parea) | |
5769d3cd AC |
457 | { |
458 | fprintf_unfiltered (gdb_stderr, | |
e1457d83 | 459 | "Attempt to remove nonexistent watchpoint.\n"); |
5769d3cd AC |
460 | return -1; |
461 | } | |
e1457d83 JB |
462 | |
463 | area = *parea; | |
464 | *parea = area->next; | |
465 | xfree (area); | |
466 | ||
4c38200f PA |
467 | ALL_LWPS (lp) |
468 | s390_fix_watch_points (lp->ptid); | |
e1457d83 | 469 | return 0; |
5769d3cd AC |
470 | } |
471 | ||
fd7979d1 UW |
472 | static int |
473 | s390_can_use_hw_breakpoint (int type, int cnt, int othertype) | |
474 | { | |
b1798462 | 475 | return type == bp_hardware_watchpoint; |
fd7979d1 | 476 | } |
e1457d83 | 477 | |
fd7979d1 | 478 | static int |
2a3cdf79 | 479 | s390_region_ok_for_hw_watchpoint (CORE_ADDR addr, int cnt) |
5769d3cd | 480 | { |
fd7979d1 | 481 | return 1; |
5769d3cd AC |
482 | } |
483 | ||
7803799a UW |
484 | static int |
485 | s390_target_wordsize (void) | |
486 | { | |
487 | int wordsize = 4; | |
488 | ||
489 | /* Check for 64-bit inferior process. This is the case when the host is | |
490 | 64-bit, and in addition bit 32 of the PSW mask is set. */ | |
491 | #ifdef __s390x__ | |
492 | long pswm; | |
493 | ||
494 | errno = 0; | |
495 | pswm = (long) ptrace (PTRACE_PEEKUSER, s390_inferior_tid (), PT_PSWMASK, 0); | |
496 | if (errno == 0 && (pswm & 0x100000000ul) != 0) | |
497 | wordsize = 8; | |
498 | #endif | |
499 | ||
500 | return wordsize; | |
501 | } | |
502 | ||
503 | static int | |
504 | s390_auxv_parse (struct target_ops *ops, gdb_byte **readptr, | |
505 | gdb_byte *endptr, CORE_ADDR *typep, CORE_ADDR *valp) | |
506 | { | |
507 | int sizeof_auxv_field = s390_target_wordsize (); | |
508 | enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch); | |
509 | gdb_byte *ptr = *readptr; | |
510 | ||
511 | if (endptr == ptr) | |
512 | return 0; | |
513 | ||
514 | if (endptr - ptr < sizeof_auxv_field * 2) | |
515 | return -1; | |
516 | ||
517 | *typep = extract_unsigned_integer (ptr, sizeof_auxv_field, byte_order); | |
518 | ptr += sizeof_auxv_field; | |
519 | *valp = extract_unsigned_integer (ptr, sizeof_auxv_field, byte_order); | |
520 | ptr += sizeof_auxv_field; | |
521 | ||
522 | *readptr = ptr; | |
523 | return 1; | |
524 | } | |
525 | ||
526 | #ifdef __s390x__ | |
527 | static unsigned long | |
528 | s390_get_hwcap (void) | |
529 | { | |
530 | CORE_ADDR field; | |
531 | ||
532 | if (target_auxv_search (¤t_target, AT_HWCAP, &field)) | |
533 | return (unsigned long) field; | |
534 | ||
535 | return 0; | |
536 | } | |
537 | #endif | |
538 | ||
539 | static const struct target_desc * | |
540 | s390_read_description (struct target_ops *ops) | |
541 | { | |
542 | #ifdef __s390x__ | |
543 | /* If GDB itself is compiled as 64-bit, we are running on a machine in | |
544 | z/Architecture mode. If the target is running in 64-bit addressing | |
545 | mode, report s390x architecture. If the target is running in 31-bit | |
546 | addressing mode, but the kernel supports using 64-bit registers in | |
547 | that mode, report s390 architecture with 64-bit GPRs. */ | |
548 | ||
549 | if (s390_target_wordsize () == 8) | |
550 | return tdesc_s390x_linux64; | |
551 | ||
552 | if (s390_get_hwcap () & HWCAP_S390_HIGH_GPRS) | |
553 | return tdesc_s390_linux64; | |
554 | #endif | |
555 | ||
556 | /* If GDB itself is compiled as 31-bit, or if we're running a 31-bit inferior | |
557 | on a 64-bit kernel that does not support using 64-bit registers in 31-bit | |
558 | mode, report s390 architecture with 32-bit GPRs. */ | |
559 | return tdesc_s390_linux32; | |
560 | } | |
fd7979d1 | 561 | |
10d6c8cd DJ |
562 | void _initialize_s390_nat (void); |
563 | ||
564 | void | |
565 | _initialize_s390_nat (void) | |
566 | { | |
567 | struct target_ops *t; | |
568 | ||
569 | /* Fill in the generic GNU/Linux methods. */ | |
570 | t = linux_target (); | |
571 | ||
572 | /* Add our register access methods. */ | |
573 | t->to_fetch_registers = s390_linux_fetch_inferior_registers; | |
574 | t->to_store_registers = s390_linux_store_inferior_registers; | |
575 | ||
fd7979d1 UW |
576 | /* Add our watchpoint methods. */ |
577 | t->to_can_use_hw_breakpoint = s390_can_use_hw_breakpoint; | |
2a3cdf79 | 578 | t->to_region_ok_for_hw_watchpoint = s390_region_ok_for_hw_watchpoint; |
fd7979d1 UW |
579 | t->to_have_continuable_watchpoint = 1; |
580 | t->to_stopped_by_watchpoint = s390_stopped_by_watchpoint; | |
581 | t->to_insert_watchpoint = s390_insert_watchpoint; | |
582 | t->to_remove_watchpoint = s390_remove_watchpoint; | |
583 | ||
7803799a UW |
584 | /* Detect target architecture. */ |
585 | t->to_read_description = s390_read_description; | |
586 | t->to_auxv_parse = s390_auxv_parse; | |
587 | ||
10d6c8cd | 588 | /* Register the target. */ |
f973ed9c | 589 | linux_nat_add_target (t); |
9f0bdab8 | 590 | linux_nat_set_new_thread (t, s390_fix_watch_points); |
10d6c8cd | 591 | } |