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5769d3cd | 1 | /* S390 native-dependent code for GDB, the GNU debugger. |
618f726f | 2 | Copyright (C) 2001-2016 Free Software Foundation, Inc. |
d0f54f9d | 3 | |
5769d3cd AC |
4 | Contributed by D.J. Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com) |
5 | for IBM Deutschland Entwicklung GmbH, IBM Corporation. | |
d0f54f9d | 6 | |
5769d3cd AC |
7 | This file is part of GDB. |
8 | ||
9 | This program is free software; you can redistribute it and/or modify | |
10 | it under the terms of the GNU General Public License as published by | |
a9762ec7 | 11 | the Free Software Foundation; either version 3 of the License, or |
5769d3cd AC |
12 | (at your option) any later version. |
13 | ||
14 | This program is distributed in the hope that it will be useful, | |
15 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | GNU General Public License for more details. | |
18 | ||
19 | You should have received a copy of the GNU General Public License | |
a9762ec7 | 20 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
5769d3cd AC |
21 | |
22 | #include "defs.h" | |
3ecc0ae2 | 23 | #include "regcache.h" |
d0f54f9d | 24 | #include "inferior.h" |
10d6c8cd DJ |
25 | #include "target.h" |
26 | #include "linux-nat.h" | |
7803799a | 27 | #include "auxv.h" |
5538f557 | 28 | #include "gregset.h" |
99b7da5d | 29 | #include "regset.h" |
ca9b78ce | 30 | #include "nat/linux-ptrace.h" |
d0f54f9d | 31 | |
0e5fae36 | 32 | #include "s390-linux-tdep.h" |
c642a434 | 33 | #include "elf/common.h" |
d0f54f9d | 34 | |
5769d3cd | 35 | #include <asm/ptrace.h> |
5826e159 | 36 | #include "nat/gdb_ptrace.h" |
2d0c7962 | 37 | #include <asm/types.h> |
5769d3cd | 38 | #include <sys/procfs.h> |
5769d3cd | 39 | #include <sys/ucontext.h> |
7803799a UW |
40 | #include <elf.h> |
41 | ||
18396193 AA |
42 | /* Per-thread arch-specific data. */ |
43 | ||
44 | struct arch_lwp_info | |
45 | { | |
46 | /* Non-zero if the thread's PER info must be re-written. */ | |
47 | int per_info_changed; | |
48 | }; | |
49 | ||
c642a434 UW |
50 | static int have_regset_last_break = 0; |
51 | static int have_regset_system_call = 0; | |
4ac33720 | 52 | static int have_regset_tdb = 0; |
550bdf96 | 53 | static int have_regset_vxrs = 0; |
5769d3cd | 54 | |
99b7da5d AA |
55 | /* Register map for 32-bit executables running under a 64-bit |
56 | kernel. */ | |
d0f54f9d JB |
57 | |
58 | #ifdef __s390x__ | |
99b7da5d AA |
59 | static const struct regcache_map_entry s390_64_regmap_gregset[] = |
60 | { | |
61 | /* Skip PSWM and PSWA, since they must be handled specially. */ | |
62 | { 2, REGCACHE_MAP_SKIP, 8 }, | |
63 | { 1, S390_R0_UPPER_REGNUM, 4 }, { 1, S390_R0_REGNUM, 4 }, | |
64 | { 1, S390_R1_UPPER_REGNUM, 4 }, { 1, S390_R1_REGNUM, 4 }, | |
65 | { 1, S390_R2_UPPER_REGNUM, 4 }, { 1, S390_R2_REGNUM, 4 }, | |
66 | { 1, S390_R3_UPPER_REGNUM, 4 }, { 1, S390_R3_REGNUM, 4 }, | |
67 | { 1, S390_R4_UPPER_REGNUM, 4 }, { 1, S390_R4_REGNUM, 4 }, | |
68 | { 1, S390_R5_UPPER_REGNUM, 4 }, { 1, S390_R5_REGNUM, 4 }, | |
69 | { 1, S390_R6_UPPER_REGNUM, 4 }, { 1, S390_R6_REGNUM, 4 }, | |
70 | { 1, S390_R7_UPPER_REGNUM, 4 }, { 1, S390_R7_REGNUM, 4 }, | |
71 | { 1, S390_R8_UPPER_REGNUM, 4 }, { 1, S390_R8_REGNUM, 4 }, | |
72 | { 1, S390_R9_UPPER_REGNUM, 4 }, { 1, S390_R9_REGNUM, 4 }, | |
73 | { 1, S390_R10_UPPER_REGNUM, 4 }, { 1, S390_R10_REGNUM, 4 }, | |
74 | { 1, S390_R11_UPPER_REGNUM, 4 }, { 1, S390_R11_REGNUM, 4 }, | |
75 | { 1, S390_R12_UPPER_REGNUM, 4 }, { 1, S390_R12_REGNUM, 4 }, | |
76 | { 1, S390_R13_UPPER_REGNUM, 4 }, { 1, S390_R13_REGNUM, 4 }, | |
77 | { 1, S390_R14_UPPER_REGNUM, 4 }, { 1, S390_R14_REGNUM, 4 }, | |
78 | { 1, S390_R15_UPPER_REGNUM, 4 }, { 1, S390_R15_REGNUM, 4 }, | |
79 | { 16, S390_A0_REGNUM, 4 }, | |
80 | { 1, REGCACHE_MAP_SKIP, 4 }, { 1, S390_ORIG_R2_REGNUM, 4 }, | |
81 | { 0 } | |
82 | }; | |
83 | ||
84 | static const struct regset s390_64_gregset = | |
85 | { | |
86 | s390_64_regmap_gregset, | |
87 | regcache_supply_regset, | |
88 | regcache_collect_regset | |
89 | }; | |
90 | ||
91 | #define S390_PSWM_OFFSET 0 | |
92 | #define S390_PSWA_OFFSET 8 | |
5769d3cd | 93 | #endif |
d0f54f9d | 94 | |
2ccd1468 UW |
95 | /* Fill GDB's register array with the general-purpose register values |
96 | in *REGP. | |
97 | ||
98 | When debugging a 32-bit executable running under a 64-bit kernel, | |
99 | we have to fix up the 64-bit registers we get from the kernel to | |
100 | make them look like 32-bit registers. */ | |
d6db1fab | 101 | |
2ccd1468 UW |
102 | void |
103 | supply_gregset (struct regcache *regcache, const gregset_t *regp) | |
104 | { | |
9cbd5950 | 105 | #ifdef __s390x__ |
d6db1fab | 106 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
2ccd1468 | 107 | if (gdbarch_ptr_bit (gdbarch) == 32) |
d6db1fab UW |
108 | { |
109 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); | |
99b7da5d | 110 | ULONGEST pswm, pswa; |
2ccd1468 | 111 | gdb_byte buf[4]; |
d6db1fab | 112 | |
99b7da5d AA |
113 | regcache_supply_regset (&s390_64_gregset, regcache, -1, |
114 | regp, sizeof (gregset_t)); | |
115 | pswm = extract_unsigned_integer ((const gdb_byte *) regp | |
116 | + S390_PSWM_OFFSET, 8, byte_order); | |
117 | pswa = extract_unsigned_integer ((const gdb_byte *) regp | |
118 | + S390_PSWA_OFFSET, 8, byte_order); | |
2ccd1468 UW |
119 | store_unsigned_integer (buf, 4, byte_order, (pswm >> 32) | 0x80000); |
120 | regcache_raw_supply (regcache, S390_PSWM_REGNUM, buf); | |
121 | store_unsigned_integer (buf, 4, byte_order, | |
122 | (pswa & 0x7fffffff) | (pswm & 0x80000000)); | |
123 | regcache_raw_supply (regcache, S390_PSWA_REGNUM, buf); | |
124 | return; | |
d6db1fab UW |
125 | } |
126 | #endif | |
127 | ||
99b7da5d AA |
128 | regcache_supply_regset (&s390_gregset, regcache, -1, regp, |
129 | sizeof (gregset_t)); | |
d6db1fab UW |
130 | } |
131 | ||
2ccd1468 UW |
132 | /* Fill register REGNO (if it is a general-purpose register) in |
133 | *REGP with the value in GDB's register array. If REGNO is -1, | |
134 | do this for all registers. */ | |
d6db1fab | 135 | |
2ccd1468 UW |
136 | void |
137 | fill_gregset (const struct regcache *regcache, gregset_t *regp, int regno) | |
138 | { | |
d6db1fab UW |
139 | #ifdef __s390x__ |
140 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
2ccd1468 | 141 | if (gdbarch_ptr_bit (gdbarch) == 32) |
d6db1fab | 142 | { |
99b7da5d AA |
143 | regcache_collect_regset (&s390_64_gregset, regcache, regno, |
144 | regp, sizeof (gregset_t)); | |
d6db1fab | 145 | |
2ccd1468 UW |
146 | if (regno == -1 |
147 | || regno == S390_PSWM_REGNUM || regno == S390_PSWA_REGNUM) | |
d6db1fab | 148 | { |
2ccd1468 UW |
149 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
150 | ULONGEST pswa, pswm; | |
d6db1fab | 151 | gdb_byte buf[4]; |
2492f0d0 AA |
152 | gdb_byte *pswm_p = (gdb_byte *) regp + S390_PSWM_OFFSET; |
153 | gdb_byte *pswa_p = (gdb_byte *) regp + S390_PSWA_OFFSET; | |
d6db1fab | 154 | |
2492f0d0 | 155 | pswm = extract_unsigned_integer (pswm_p, 8, byte_order); |
d6db1fab | 156 | |
2ccd1468 | 157 | if (regno == -1 || regno == S390_PSWM_REGNUM) |
2492f0d0 AA |
158 | { |
159 | pswm &= 0x80000000; | |
160 | regcache_raw_collect (regcache, S390_PSWM_REGNUM, buf); | |
161 | pswm |= (extract_unsigned_integer (buf, 4, byte_order) | |
162 | & 0xfff7ffff) << 32; | |
163 | } | |
164 | ||
2ccd1468 | 165 | if (regno == -1 || regno == S390_PSWA_REGNUM) |
2492f0d0 AA |
166 | { |
167 | regcache_raw_collect (regcache, S390_PSWA_REGNUM, buf); | |
168 | pswa = extract_unsigned_integer (buf, 4, byte_order); | |
169 | pswm ^= (pswm ^ pswa) & 0x80000000; | |
170 | pswa &= 0x7fffffff; | |
171 | store_unsigned_integer (pswa_p, 8, byte_order, pswa); | |
172 | } | |
173 | ||
174 | store_unsigned_integer (pswm_p, 8, byte_order, pswm); | |
d6db1fab | 175 | } |
2ccd1468 | 176 | return; |
d6db1fab | 177 | } |
9cbd5950 JB |
178 | #endif |
179 | ||
99b7da5d AA |
180 | regcache_collect_regset (&s390_gregset, regcache, regno, regp, |
181 | sizeof (gregset_t)); | |
d0f54f9d JB |
182 | } |
183 | ||
184 | /* Fill GDB's register array with the floating-point register values | |
185 | in *REGP. */ | |
186 | void | |
7f7fe91e | 187 | supply_fpregset (struct regcache *regcache, const fpregset_t *regp) |
d0f54f9d | 188 | { |
99b7da5d AA |
189 | regcache_supply_regset (&s390_fpregset, regcache, -1, regp, |
190 | sizeof (fpregset_t)); | |
d0f54f9d JB |
191 | } |
192 | ||
193 | /* Fill register REGNO (if it is a general-purpose register) in | |
194 | *REGP with the value in GDB's register array. If REGNO is -1, | |
195 | do this for all registers. */ | |
196 | void | |
7f7fe91e | 197 | fill_fpregset (const struct regcache *regcache, fpregset_t *regp, int regno) |
d0f54f9d | 198 | { |
99b7da5d AA |
199 | regcache_collect_regset (&s390_fpregset, regcache, regno, regp, |
200 | sizeof (fpregset_t)); | |
d0f54f9d JB |
201 | } |
202 | ||
203 | /* Find the TID for the current inferior thread to use with ptrace. */ | |
204 | static int | |
205 | s390_inferior_tid (void) | |
206 | { | |
207 | /* GNU/Linux LWP ID's are process ID's. */ | |
dfd4cc63 | 208 | int tid = ptid_get_lwp (inferior_ptid); |
d0f54f9d | 209 | if (tid == 0) |
dfd4cc63 | 210 | tid = ptid_get_pid (inferior_ptid); /* Not a threaded program. */ |
d0f54f9d JB |
211 | |
212 | return tid; | |
213 | } | |
214 | ||
215 | /* Fetch all general-purpose registers from process/thread TID and | |
216 | store their values in GDB's register cache. */ | |
217 | static void | |
56be3814 | 218 | fetch_regs (struct regcache *regcache, int tid) |
d0f54f9d JB |
219 | { |
220 | gregset_t regs; | |
221 | ptrace_area parea; | |
222 | ||
223 | parea.len = sizeof (regs); | |
224 | parea.process_addr = (addr_t) ®s; | |
225 | parea.kernel_addr = offsetof (struct user_regs_struct, psw); | |
2b4cab86 | 226 | if (ptrace (PTRACE_PEEKUSR_AREA, tid, (long) &parea, 0) < 0) |
e2e0b3e5 | 227 | perror_with_name (_("Couldn't get registers")); |
d0f54f9d | 228 | |
56be3814 | 229 | supply_gregset (regcache, (const gregset_t *) ®s); |
d0f54f9d JB |
230 | } |
231 | ||
232 | /* Store all valid general-purpose registers in GDB's register cache | |
233 | into the process/thread specified by TID. */ | |
234 | static void | |
56be3814 | 235 | store_regs (const struct regcache *regcache, int tid, int regnum) |
d0f54f9d JB |
236 | { |
237 | gregset_t regs; | |
238 | ptrace_area parea; | |
239 | ||
240 | parea.len = sizeof (regs); | |
241 | parea.process_addr = (addr_t) ®s; | |
242 | parea.kernel_addr = offsetof (struct user_regs_struct, psw); | |
2b4cab86 | 243 | if (ptrace (PTRACE_PEEKUSR_AREA, tid, (long) &parea, 0) < 0) |
e2e0b3e5 | 244 | perror_with_name (_("Couldn't get registers")); |
d0f54f9d | 245 | |
56be3814 | 246 | fill_gregset (regcache, ®s, regnum); |
d0f54f9d | 247 | |
2b4cab86 | 248 | if (ptrace (PTRACE_POKEUSR_AREA, tid, (long) &parea, 0) < 0) |
e2e0b3e5 | 249 | perror_with_name (_("Couldn't write registers")); |
d0f54f9d JB |
250 | } |
251 | ||
252 | /* Fetch all floating-point registers from process/thread TID and store | |
253 | their values in GDB's register cache. */ | |
254 | static void | |
56be3814 | 255 | fetch_fpregs (struct regcache *regcache, int tid) |
d0f54f9d JB |
256 | { |
257 | fpregset_t fpregs; | |
258 | ptrace_area parea; | |
259 | ||
260 | parea.len = sizeof (fpregs); | |
261 | parea.process_addr = (addr_t) &fpregs; | |
262 | parea.kernel_addr = offsetof (struct user_regs_struct, fp_regs); | |
2b4cab86 | 263 | if (ptrace (PTRACE_PEEKUSR_AREA, tid, (long) &parea, 0) < 0) |
e2e0b3e5 | 264 | perror_with_name (_("Couldn't get floating point status")); |
d0f54f9d | 265 | |
56be3814 | 266 | supply_fpregset (regcache, (const fpregset_t *) &fpregs); |
d0f54f9d JB |
267 | } |
268 | ||
269 | /* Store all valid floating-point registers in GDB's register cache | |
270 | into the process/thread specified by TID. */ | |
271 | static void | |
56be3814 | 272 | store_fpregs (const struct regcache *regcache, int tid, int regnum) |
d0f54f9d JB |
273 | { |
274 | fpregset_t fpregs; | |
275 | ptrace_area parea; | |
276 | ||
277 | parea.len = sizeof (fpregs); | |
278 | parea.process_addr = (addr_t) &fpregs; | |
279 | parea.kernel_addr = offsetof (struct user_regs_struct, fp_regs); | |
2b4cab86 | 280 | if (ptrace (PTRACE_PEEKUSR_AREA, tid, (long) &parea, 0) < 0) |
e2e0b3e5 | 281 | perror_with_name (_("Couldn't get floating point status")); |
d0f54f9d | 282 | |
56be3814 | 283 | fill_fpregset (regcache, &fpregs, regnum); |
d0f54f9d | 284 | |
2b4cab86 | 285 | if (ptrace (PTRACE_POKEUSR_AREA, tid, (long) &parea, 0) < 0) |
e2e0b3e5 | 286 | perror_with_name (_("Couldn't write floating point status")); |
d0f54f9d JB |
287 | } |
288 | ||
99b7da5d AA |
289 | /* Fetch all registers in the kernel's register set whose number is |
290 | REGSET_ID, whose size is REGSIZE, and whose layout is described by | |
291 | REGSET, from process/thread TID and store their values in GDB's | |
292 | register cache. */ | |
c642a434 UW |
293 | static void |
294 | fetch_regset (struct regcache *regcache, int tid, | |
99b7da5d | 295 | int regset_id, int regsize, const struct regset *regset) |
c642a434 | 296 | { |
3451269c | 297 | void *buf = alloca (regsize); |
c642a434 | 298 | struct iovec iov; |
c642a434 UW |
299 | |
300 | iov.iov_base = buf; | |
301 | iov.iov_len = regsize; | |
302 | ||
99b7da5d | 303 | if (ptrace (PTRACE_GETREGSET, tid, (long) regset_id, (long) &iov) < 0) |
4ac33720 UW |
304 | { |
305 | if (errno == ENODATA) | |
99b7da5d | 306 | regcache_supply_regset (regset, regcache, -1, NULL, regsize); |
4ac33720 UW |
307 | else |
308 | perror_with_name (_("Couldn't get register set")); | |
309 | } | |
310 | else | |
99b7da5d | 311 | regcache_supply_regset (regset, regcache, -1, buf, regsize); |
c642a434 UW |
312 | } |
313 | ||
99b7da5d AA |
314 | /* Store all registers in the kernel's register set whose number is |
315 | REGSET_ID, whose size is REGSIZE, and whose layout is described by | |
316 | REGSET, from GDB's register cache back to process/thread TID. */ | |
c642a434 UW |
317 | static void |
318 | store_regset (struct regcache *regcache, int tid, | |
99b7da5d | 319 | int regset_id, int regsize, const struct regset *regset) |
c642a434 | 320 | { |
3451269c | 321 | void *buf = alloca (regsize); |
c642a434 | 322 | struct iovec iov; |
c642a434 UW |
323 | |
324 | iov.iov_base = buf; | |
325 | iov.iov_len = regsize; | |
326 | ||
99b7da5d | 327 | if (ptrace (PTRACE_GETREGSET, tid, (long) regset_id, (long) &iov) < 0) |
c642a434 UW |
328 | perror_with_name (_("Couldn't get register set")); |
329 | ||
99b7da5d | 330 | regcache_collect_regset (regset, regcache, -1, buf, regsize); |
c642a434 | 331 | |
99b7da5d | 332 | if (ptrace (PTRACE_SETREGSET, tid, (long) regset_id, (long) &iov) < 0) |
c642a434 UW |
333 | perror_with_name (_("Couldn't set register set")); |
334 | } | |
335 | ||
336 | /* Check whether the kernel provides a register set with number REGSET | |
337 | of size REGSIZE for process/thread TID. */ | |
338 | static int | |
339 | check_regset (int tid, int regset, int regsize) | |
340 | { | |
3451269c | 341 | void *buf = alloca (regsize); |
c642a434 UW |
342 | struct iovec iov; |
343 | ||
344 | iov.iov_base = buf; | |
345 | iov.iov_len = regsize; | |
346 | ||
4ac33720 UW |
347 | if (ptrace (PTRACE_GETREGSET, tid, (long) regset, (long) &iov) >= 0 |
348 | || errno == ENODATA) | |
c642a434 | 349 | return 1; |
4ac33720 | 350 | return 0; |
c642a434 UW |
351 | } |
352 | ||
d0f54f9d JB |
353 | /* Fetch register REGNUM from the child process. If REGNUM is -1, do |
354 | this for all registers. */ | |
10d6c8cd | 355 | static void |
28439f5e PA |
356 | s390_linux_fetch_inferior_registers (struct target_ops *ops, |
357 | struct regcache *regcache, int regnum) | |
d0f54f9d JB |
358 | { |
359 | int tid = s390_inferior_tid (); | |
360 | ||
2ccd1468 | 361 | if (regnum == -1 || S390_IS_GREGSET_REGNUM (regnum)) |
56be3814 | 362 | fetch_regs (regcache, tid); |
d0f54f9d | 363 | |
2ccd1468 | 364 | if (regnum == -1 || S390_IS_FPREGSET_REGNUM (regnum)) |
56be3814 | 365 | fetch_fpregs (regcache, tid); |
c642a434 UW |
366 | |
367 | if (have_regset_last_break) | |
368 | if (regnum == -1 || regnum == S390_LAST_BREAK_REGNUM) | |
369 | fetch_regset (regcache, tid, NT_S390_LAST_BREAK, 8, | |
370 | (gdbarch_ptr_bit (get_regcache_arch (regcache)) == 32 | |
99b7da5d | 371 | ? &s390_last_break_regset : &s390x_last_break_regset)); |
c642a434 UW |
372 | |
373 | if (have_regset_system_call) | |
374 | if (regnum == -1 || regnum == S390_SYSTEM_CALL_REGNUM) | |
375 | fetch_regset (regcache, tid, NT_S390_SYSTEM_CALL, 4, | |
99b7da5d | 376 | &s390_system_call_regset); |
4ac33720 UW |
377 | |
378 | if (have_regset_tdb) | |
379 | if (regnum == -1 || S390_IS_TDBREGSET_REGNUM (regnum)) | |
380 | fetch_regset (regcache, tid, NT_S390_TDB, s390_sizeof_tdbregset, | |
99b7da5d | 381 | &s390_tdb_regset); |
550bdf96 AA |
382 | |
383 | if (have_regset_vxrs) | |
384 | { | |
385 | if (regnum == -1 || (regnum >= S390_V0_LOWER_REGNUM | |
386 | && regnum <= S390_V15_LOWER_REGNUM)) | |
387 | fetch_regset (regcache, tid, NT_S390_VXRS_LOW, 16 * 8, | |
388 | &s390_vxrs_low_regset); | |
389 | if (regnum == -1 || (regnum >= S390_V16_REGNUM | |
390 | && regnum <= S390_V31_REGNUM)) | |
391 | fetch_regset (regcache, tid, NT_S390_VXRS_HIGH, 16 * 16, | |
392 | &s390_vxrs_high_regset); | |
393 | } | |
d0f54f9d JB |
394 | } |
395 | ||
396 | /* Store register REGNUM back into the child process. If REGNUM is | |
397 | -1, do this for all registers. */ | |
10d6c8cd | 398 | static void |
28439f5e PA |
399 | s390_linux_store_inferior_registers (struct target_ops *ops, |
400 | struct regcache *regcache, int regnum) | |
d0f54f9d JB |
401 | { |
402 | int tid = s390_inferior_tid (); | |
403 | ||
2ccd1468 | 404 | if (regnum == -1 || S390_IS_GREGSET_REGNUM (regnum)) |
56be3814 | 405 | store_regs (regcache, tid, regnum); |
d0f54f9d | 406 | |
2ccd1468 | 407 | if (regnum == -1 || S390_IS_FPREGSET_REGNUM (regnum)) |
56be3814 | 408 | store_fpregs (regcache, tid, regnum); |
c642a434 UW |
409 | |
410 | /* S390_LAST_BREAK_REGNUM is read-only. */ | |
411 | ||
412 | if (have_regset_system_call) | |
413 | if (regnum == -1 || regnum == S390_SYSTEM_CALL_REGNUM) | |
414 | store_regset (regcache, tid, NT_S390_SYSTEM_CALL, 4, | |
99b7da5d | 415 | &s390_system_call_regset); |
550bdf96 AA |
416 | |
417 | if (have_regset_vxrs) | |
418 | { | |
419 | if (regnum == -1 || (regnum >= S390_V0_LOWER_REGNUM | |
420 | && regnum <= S390_V15_LOWER_REGNUM)) | |
421 | store_regset (regcache, tid, NT_S390_VXRS_LOW, 16 * 8, | |
422 | &s390_vxrs_low_regset); | |
423 | if (regnum == -1 || (regnum >= S390_V16_REGNUM | |
424 | && regnum <= S390_V31_REGNUM)) | |
425 | store_regset (regcache, tid, NT_S390_VXRS_HIGH, 16 * 16, | |
426 | &s390_vxrs_high_regset); | |
427 | } | |
5769d3cd AC |
428 | } |
429 | ||
d0f54f9d | 430 | |
e1457d83 JB |
431 | /* Hardware-assisted watchpoint handling. */ |
432 | ||
373c3dad AA |
433 | /* For each process we maintain a list of all currently active |
434 | watchpoints, in order to properly handle watchpoint removal. | |
e1457d83 JB |
435 | |
436 | The only thing we actually need is the total address space area | |
437 | spanned by the watchpoints. */ | |
438 | ||
17c84cca | 439 | typedef struct watch_area |
5769d3cd | 440 | { |
5769d3cd AC |
441 | CORE_ADDR lo_addr; |
442 | CORE_ADDR hi_addr; | |
17c84cca AA |
443 | } s390_watch_area; |
444 | ||
445 | DEF_VEC_O (s390_watch_area); | |
5769d3cd | 446 | |
373c3dad AA |
447 | /* Hardware debug state. */ |
448 | ||
449 | struct s390_debug_reg_state | |
450 | { | |
451 | VEC_s390_watch_area *watch_areas; | |
452 | }; | |
453 | ||
454 | /* Per-process data. */ | |
455 | ||
456 | struct s390_process_info | |
457 | { | |
458 | struct s390_process_info *next; | |
459 | pid_t pid; | |
460 | struct s390_debug_reg_state state; | |
461 | }; | |
462 | ||
463 | static struct s390_process_info *s390_process_list = NULL; | |
464 | ||
465 | /* Find process data for process PID. */ | |
466 | ||
467 | static struct s390_process_info * | |
468 | s390_find_process_pid (pid_t pid) | |
469 | { | |
470 | struct s390_process_info *proc; | |
471 | ||
472 | for (proc = s390_process_list; proc; proc = proc->next) | |
473 | if (proc->pid == pid) | |
474 | return proc; | |
475 | ||
476 | return NULL; | |
477 | } | |
478 | ||
479 | /* Add process data for process PID. Returns newly allocated info | |
480 | object. */ | |
481 | ||
482 | static struct s390_process_info * | |
483 | s390_add_process (pid_t pid) | |
484 | { | |
485 | struct s390_process_info *proc = XCNEW (struct s390_process_info); | |
486 | ||
487 | proc->pid = pid; | |
488 | proc->next = s390_process_list; | |
489 | s390_process_list = proc; | |
490 | ||
491 | return proc; | |
492 | } | |
493 | ||
494 | /* Get data specific info for process PID, creating it if necessary. | |
495 | Never returns NULL. */ | |
496 | ||
497 | static struct s390_process_info * | |
498 | s390_process_info_get (pid_t pid) | |
499 | { | |
500 | struct s390_process_info *proc; | |
501 | ||
502 | proc = s390_find_process_pid (pid); | |
503 | if (proc == NULL) | |
504 | proc = s390_add_process (pid); | |
505 | ||
506 | return proc; | |
507 | } | |
508 | ||
509 | /* Get hardware debug state for process PID. */ | |
510 | ||
511 | static struct s390_debug_reg_state * | |
512 | s390_get_debug_reg_state (pid_t pid) | |
513 | { | |
514 | return &s390_process_info_get (pid)->state; | |
515 | } | |
516 | ||
517 | /* Called whenever GDB is no longer debugging process PID. It deletes | |
518 | data structures that keep track of hardware debug state. */ | |
519 | ||
520 | static void | |
521 | s390_forget_process (pid_t pid) | |
522 | { | |
523 | struct s390_process_info *proc, **proc_link; | |
524 | ||
525 | proc = s390_process_list; | |
526 | proc_link = &s390_process_list; | |
527 | ||
528 | while (proc != NULL) | |
529 | { | |
530 | if (proc->pid == pid) | |
531 | { | |
532 | VEC_free (s390_watch_area, proc->state.watch_areas); | |
533 | *proc_link = proc->next; | |
534 | xfree (proc); | |
535 | return; | |
536 | } | |
537 | ||
538 | proc_link = &proc->next; | |
539 | proc = *proc_link; | |
540 | } | |
541 | } | |
542 | ||
543 | /* linux_nat_new_fork hook. */ | |
544 | ||
545 | static void | |
546 | s390_linux_new_fork (struct lwp_info *parent, pid_t child_pid) | |
547 | { | |
548 | pid_t parent_pid; | |
549 | struct s390_debug_reg_state *parent_state; | |
550 | struct s390_debug_reg_state *child_state; | |
551 | ||
552 | /* NULL means no watchpoint has ever been set in the parent. In | |
553 | that case, there's nothing to do. */ | |
554 | if (lwp_arch_private_info (parent) == NULL) | |
555 | return; | |
556 | ||
557 | /* GDB core assumes the child inherits the watchpoints/hw breakpoints of | |
558 | the parent. So copy the debug state from parent to child. */ | |
559 | ||
560 | parent_pid = ptid_get_pid (parent->ptid); | |
561 | parent_state = s390_get_debug_reg_state (parent_pid); | |
562 | child_state = s390_get_debug_reg_state (child_pid); | |
563 | ||
564 | child_state->watch_areas = VEC_copy (s390_watch_area, | |
565 | parent_state->watch_areas); | |
566 | } | |
5769d3cd | 567 | |
fd7979d1 | 568 | static int |
6a109b6b | 569 | s390_stopped_by_watchpoint (struct target_ops *ops) |
5769d3cd | 570 | { |
373c3dad AA |
571 | struct s390_debug_reg_state *state |
572 | = s390_get_debug_reg_state (ptid_get_pid (inferior_ptid)); | |
5769d3cd AC |
573 | per_lowcore_bits per_lowcore; |
574 | ptrace_area parea; | |
9f0bdab8 | 575 | int result; |
5769d3cd | 576 | |
e1457d83 | 577 | /* Speed up common case. */ |
373c3dad | 578 | if (VEC_empty (s390_watch_area, state->watch_areas)) |
e1457d83 JB |
579 | return 0; |
580 | ||
5769d3cd AC |
581 | parea.len = sizeof (per_lowcore); |
582 | parea.process_addr = (addr_t) & per_lowcore; | |
583 | parea.kernel_addr = offsetof (struct user_regs_struct, per_info.lowcore); | |
2b4cab86 | 584 | if (ptrace (PTRACE_PEEKUSR_AREA, s390_inferior_tid (), &parea, 0) < 0) |
e2e0b3e5 | 585 | perror_with_name (_("Couldn't retrieve watchpoint status")); |
5769d3cd | 586 | |
9f0bdab8 DJ |
587 | result = (per_lowcore.perc_storage_alteration == 1 |
588 | && per_lowcore.perc_store_real_address == 0); | |
589 | ||
590 | if (result) | |
591 | { | |
592 | /* Do not report this watchpoint again. */ | |
593 | memset (&per_lowcore, 0, sizeof (per_lowcore)); | |
2b4cab86 | 594 | if (ptrace (PTRACE_POKEUSR_AREA, s390_inferior_tid (), &parea, 0) < 0) |
9f0bdab8 DJ |
595 | perror_with_name (_("Couldn't clear watchpoint status")); |
596 | } | |
597 | ||
598 | return result; | |
e1457d83 | 599 | } |
5769d3cd | 600 | |
18396193 AA |
601 | /* Each time before resuming a thread, update its PER info. */ |
602 | ||
e1457d83 | 603 | static void |
18396193 | 604 | s390_prepare_to_resume (struct lwp_info *lp) |
5769d3cd | 605 | { |
9f0bdab8 | 606 | int tid; |
373c3dad | 607 | pid_t pid = ptid_get_pid (ptid_of_lwp (lp)); |
e1457d83 | 608 | |
5769d3cd AC |
609 | per_struct per_info; |
610 | ptrace_area parea; | |
611 | ||
e1457d83 | 612 | CORE_ADDR watch_lo_addr = (CORE_ADDR)-1, watch_hi_addr = 0; |
17c84cca AA |
613 | unsigned ix; |
614 | s390_watch_area *area; | |
9c2996c9 | 615 | struct arch_lwp_info *lp_priv = lwp_arch_private_info (lp); |
373c3dad | 616 | struct s390_debug_reg_state *state = s390_get_debug_reg_state (pid); |
e1457d83 | 617 | |
9c2996c9 | 618 | if (lp_priv == NULL || !lp_priv->per_info_changed) |
18396193 AA |
619 | return; |
620 | ||
9c2996c9 | 621 | lp_priv->per_info_changed = 0; |
18396193 | 622 | |
9c2996c9 | 623 | tid = ptid_get_lwp (ptid_of_lwp (lp)); |
9f0bdab8 | 624 | if (tid == 0) |
373c3dad | 625 | tid = pid; |
9f0bdab8 | 626 | |
5769d3cd AC |
627 | parea.len = sizeof (per_info); |
628 | parea.process_addr = (addr_t) & per_info; | |
e1457d83 | 629 | parea.kernel_addr = offsetof (struct user_regs_struct, per_info); |
2b4cab86 | 630 | if (ptrace (PTRACE_PEEKUSR_AREA, tid, &parea, 0) < 0) |
e2e0b3e5 | 631 | perror_with_name (_("Couldn't retrieve watchpoint status")); |
e1457d83 | 632 | |
373c3dad | 633 | if (!VEC_empty (s390_watch_area, state->watch_areas)) |
5769d3cd | 634 | { |
17c84cca | 635 | for (ix = 0; |
373c3dad | 636 | VEC_iterate (s390_watch_area, state->watch_areas, ix, area); |
17c84cca AA |
637 | ix++) |
638 | { | |
639 | watch_lo_addr = min (watch_lo_addr, area->lo_addr); | |
640 | watch_hi_addr = max (watch_hi_addr, area->hi_addr); | |
641 | } | |
642 | ||
5769d3cd AC |
643 | per_info.control_regs.bits.em_storage_alteration = 1; |
644 | per_info.control_regs.bits.storage_alt_space_ctl = 1; | |
645 | } | |
646 | else | |
647 | { | |
648 | per_info.control_regs.bits.em_storage_alteration = 0; | |
649 | per_info.control_regs.bits.storage_alt_space_ctl = 0; | |
650 | } | |
651 | per_info.starting_addr = watch_lo_addr; | |
652 | per_info.ending_addr = watch_hi_addr; | |
e1457d83 | 653 | |
2b4cab86 | 654 | if (ptrace (PTRACE_POKEUSR_AREA, tid, &parea, 0) < 0) |
e2e0b3e5 | 655 | perror_with_name (_("Couldn't modify watchpoint status")); |
5769d3cd AC |
656 | } |
657 | ||
9c2996c9 | 658 | /* Mark the PER info as changed, so the next resume will update it. */ |
18396193 AA |
659 | |
660 | static void | |
9c2996c9 | 661 | s390_mark_per_info_changed (struct lwp_info *lp) |
18396193 | 662 | { |
9c2996c9 AA |
663 | if (lwp_arch_private_info (lp) == NULL) |
664 | lwp_set_arch_private_info (lp, XCNEW (struct arch_lwp_info)); | |
18396193 | 665 | |
9c2996c9 | 666 | lwp_arch_private_info (lp)->per_info_changed = 1; |
18396193 AA |
667 | } |
668 | ||
669 | /* When attaching to a new thread, mark its PER info as changed. */ | |
670 | ||
671 | static void | |
672 | s390_new_thread (struct lwp_info *lp) | |
673 | { | |
9c2996c9 AA |
674 | s390_mark_per_info_changed (lp); |
675 | } | |
676 | ||
677 | /* Iterator callback for s390_refresh_per_info. */ | |
678 | ||
679 | static int | |
680 | s390_refresh_per_info_cb (struct lwp_info *lp, void *arg) | |
681 | { | |
682 | s390_mark_per_info_changed (lp); | |
683 | ||
684 | if (!lwp_is_stopped (lp)) | |
685 | linux_stop_lwp (lp); | |
686 | return 0; | |
687 | } | |
688 | ||
689 | /* Make sure that threads are stopped and mark PER info as changed. */ | |
690 | ||
691 | static int | |
692 | s390_refresh_per_info (void) | |
693 | { | |
694 | ptid_t pid_ptid = pid_to_ptid (ptid_get_pid (current_lwp_ptid ())); | |
695 | ||
696 | iterate_over_lwps (pid_ptid, s390_refresh_per_info_cb, NULL); | |
697 | return 0; | |
18396193 AA |
698 | } |
699 | ||
fd7979d1 | 700 | static int |
7bb99c53 | 701 | s390_insert_watchpoint (struct target_ops *self, |
f486487f | 702 | CORE_ADDR addr, int len, enum target_hw_bp_type type, |
0cf6dd15 | 703 | struct expression *cond) |
5769d3cd | 704 | { |
17c84cca | 705 | s390_watch_area area; |
373c3dad AA |
706 | struct s390_debug_reg_state *state |
707 | = s390_get_debug_reg_state (ptid_get_pid (inferior_ptid)); | |
9f0bdab8 | 708 | |
17c84cca AA |
709 | area.lo_addr = addr; |
710 | area.hi_addr = addr + len - 1; | |
373c3dad | 711 | VEC_safe_push (s390_watch_area, state->watch_areas, &area); |
e1457d83 | 712 | |
9c2996c9 | 713 | return s390_refresh_per_info (); |
5769d3cd AC |
714 | } |
715 | ||
fd7979d1 | 716 | static int |
11b5219a | 717 | s390_remove_watchpoint (struct target_ops *self, |
f486487f | 718 | CORE_ADDR addr, int len, enum target_hw_bp_type type, |
0cf6dd15 | 719 | struct expression *cond) |
5769d3cd | 720 | { |
17c84cca AA |
721 | unsigned ix; |
722 | s390_watch_area *area; | |
373c3dad AA |
723 | struct s390_debug_reg_state *state |
724 | = s390_get_debug_reg_state (ptid_get_pid (inferior_ptid)); | |
e1457d83 | 725 | |
17c84cca | 726 | for (ix = 0; |
373c3dad | 727 | VEC_iterate (s390_watch_area, state->watch_areas, ix, area); |
17c84cca | 728 | ix++) |
5769d3cd | 729 | { |
17c84cca AA |
730 | if (area->lo_addr == addr && area->hi_addr == addr + len - 1) |
731 | { | |
373c3dad | 732 | VEC_unordered_remove (s390_watch_area, state->watch_areas, ix); |
17c84cca AA |
733 | return s390_refresh_per_info (); |
734 | } | |
5769d3cd | 735 | } |
e1457d83 | 736 | |
17c84cca AA |
737 | fprintf_unfiltered (gdb_stderr, |
738 | "Attempt to remove nonexistent watchpoint.\n"); | |
739 | return -1; | |
5769d3cd AC |
740 | } |
741 | ||
fd7979d1 | 742 | static int |
5461485a | 743 | s390_can_use_hw_breakpoint (struct target_ops *self, |
f486487f | 744 | enum bptype type, int cnt, int othertype) |
fd7979d1 | 745 | { |
b1798462 | 746 | return type == bp_hardware_watchpoint; |
fd7979d1 | 747 | } |
e1457d83 | 748 | |
fd7979d1 | 749 | static int |
31568a15 TT |
750 | s390_region_ok_for_hw_watchpoint (struct target_ops *self, |
751 | CORE_ADDR addr, int cnt) | |
5769d3cd | 752 | { |
fd7979d1 | 753 | return 1; |
5769d3cd AC |
754 | } |
755 | ||
7803799a UW |
756 | static int |
757 | s390_target_wordsize (void) | |
758 | { | |
759 | int wordsize = 4; | |
760 | ||
761 | /* Check for 64-bit inferior process. This is the case when the host is | |
762 | 64-bit, and in addition bit 32 of the PSW mask is set. */ | |
763 | #ifdef __s390x__ | |
764 | long pswm; | |
765 | ||
766 | errno = 0; | |
767 | pswm = (long) ptrace (PTRACE_PEEKUSER, s390_inferior_tid (), PT_PSWMASK, 0); | |
768 | if (errno == 0 && (pswm & 0x100000000ul) != 0) | |
769 | wordsize = 8; | |
770 | #endif | |
771 | ||
772 | return wordsize; | |
773 | } | |
774 | ||
775 | static int | |
776 | s390_auxv_parse (struct target_ops *ops, gdb_byte **readptr, | |
777 | gdb_byte *endptr, CORE_ADDR *typep, CORE_ADDR *valp) | |
778 | { | |
779 | int sizeof_auxv_field = s390_target_wordsize (); | |
f5656ead | 780 | enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch ()); |
7803799a UW |
781 | gdb_byte *ptr = *readptr; |
782 | ||
783 | if (endptr == ptr) | |
784 | return 0; | |
785 | ||
786 | if (endptr - ptr < sizeof_auxv_field * 2) | |
787 | return -1; | |
788 | ||
789 | *typep = extract_unsigned_integer (ptr, sizeof_auxv_field, byte_order); | |
790 | ptr += sizeof_auxv_field; | |
791 | *valp = extract_unsigned_integer (ptr, sizeof_auxv_field, byte_order); | |
792 | ptr += sizeof_auxv_field; | |
793 | ||
794 | *readptr = ptr; | |
795 | return 1; | |
796 | } | |
797 | ||
7803799a UW |
798 | static const struct target_desc * |
799 | s390_read_description (struct target_ops *ops) | |
800 | { | |
c642a434 UW |
801 | int tid = s390_inferior_tid (); |
802 | ||
803 | have_regset_last_break | |
804 | = check_regset (tid, NT_S390_LAST_BREAK, 8); | |
805 | have_regset_system_call | |
806 | = check_regset (tid, NT_S390_SYSTEM_CALL, 4); | |
807 | ||
7803799a UW |
808 | /* If GDB itself is compiled as 64-bit, we are running on a machine in |
809 | z/Architecture mode. If the target is running in 64-bit addressing | |
810 | mode, report s390x architecture. If the target is running in 31-bit | |
811 | addressing mode, but the kernel supports using 64-bit registers in | |
812 | that mode, report s390 architecture with 64-bit GPRs. */ | |
550bdf96 AA |
813 | #ifdef __s390x__ |
814 | { | |
815 | CORE_ADDR hwcap = 0; | |
816 | ||
817 | target_auxv_search (¤t_target, AT_HWCAP, &hwcap); | |
818 | have_regset_tdb = (hwcap & HWCAP_S390_TE) | |
819 | && check_regset (tid, NT_S390_TDB, s390_sizeof_tdbregset); | |
820 | ||
821 | have_regset_vxrs = (hwcap & HWCAP_S390_VX) | |
822 | && check_regset (tid, NT_S390_VXRS_LOW, 16 * 8) | |
823 | && check_regset (tid, NT_S390_VXRS_HIGH, 16 * 16); | |
824 | ||
825 | if (s390_target_wordsize () == 8) | |
826 | return (have_regset_vxrs ? | |
827 | (have_regset_tdb ? tdesc_s390x_tevx_linux64 : | |
828 | tdesc_s390x_vx_linux64) : | |
829 | have_regset_tdb ? tdesc_s390x_te_linux64 : | |
830 | have_regset_system_call ? tdesc_s390x_linux64v2 : | |
831 | have_regset_last_break ? tdesc_s390x_linux64v1 : | |
832 | tdesc_s390x_linux64); | |
833 | ||
834 | if (hwcap & HWCAP_S390_HIGH_GPRS) | |
835 | return (have_regset_vxrs ? | |
836 | (have_regset_tdb ? tdesc_s390_tevx_linux64 : | |
837 | tdesc_s390_vx_linux64) : | |
838 | have_regset_tdb ? tdesc_s390_te_linux64 : | |
839 | have_regset_system_call ? tdesc_s390_linux64v2 : | |
840 | have_regset_last_break ? tdesc_s390_linux64v1 : | |
841 | tdesc_s390_linux64); | |
842 | } | |
7803799a UW |
843 | #endif |
844 | ||
845 | /* If GDB itself is compiled as 31-bit, or if we're running a 31-bit inferior | |
846 | on a 64-bit kernel that does not support using 64-bit registers in 31-bit | |
847 | mode, report s390 architecture with 32-bit GPRs. */ | |
c642a434 UW |
848 | return (have_regset_system_call? tdesc_s390_linux32v2 : |
849 | have_regset_last_break? tdesc_s390_linux32v1 : | |
850 | tdesc_s390_linux32); | |
7803799a | 851 | } |
fd7979d1 | 852 | |
10d6c8cd DJ |
853 | void _initialize_s390_nat (void); |
854 | ||
855 | void | |
856 | _initialize_s390_nat (void) | |
857 | { | |
858 | struct target_ops *t; | |
859 | ||
860 | /* Fill in the generic GNU/Linux methods. */ | |
861 | t = linux_target (); | |
862 | ||
863 | /* Add our register access methods. */ | |
864 | t->to_fetch_registers = s390_linux_fetch_inferior_registers; | |
865 | t->to_store_registers = s390_linux_store_inferior_registers; | |
866 | ||
fd7979d1 UW |
867 | /* Add our watchpoint methods. */ |
868 | t->to_can_use_hw_breakpoint = s390_can_use_hw_breakpoint; | |
2a3cdf79 | 869 | t->to_region_ok_for_hw_watchpoint = s390_region_ok_for_hw_watchpoint; |
fd7979d1 UW |
870 | t->to_have_continuable_watchpoint = 1; |
871 | t->to_stopped_by_watchpoint = s390_stopped_by_watchpoint; | |
872 | t->to_insert_watchpoint = s390_insert_watchpoint; | |
873 | t->to_remove_watchpoint = s390_remove_watchpoint; | |
874 | ||
7803799a UW |
875 | /* Detect target architecture. */ |
876 | t->to_read_description = s390_read_description; | |
877 | t->to_auxv_parse = s390_auxv_parse; | |
878 | ||
10d6c8cd | 879 | /* Register the target. */ |
f973ed9c | 880 | linux_nat_add_target (t); |
18396193 AA |
881 | linux_nat_set_new_thread (t, s390_new_thread); |
882 | linux_nat_set_prepare_to_resume (t, s390_prepare_to_resume); | |
373c3dad AA |
883 | linux_nat_set_forget_process (t, s390_forget_process); |
884 | linux_nat_set_new_fork (t, s390_linux_new_fork); | |
10d6c8cd | 885 | } |