| 1 | /* S390 native-dependent code for GDB, the GNU debugger. |
| 2 | Copyright 2001 Free Software Foundation, Inc |
| 3 | Contributed by D.J. Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com) |
| 4 | for IBM Deutschland Entwicklung GmbH, IBM Corporation. |
| 5 | This file is part of GDB. |
| 6 | |
| 7 | This program is free software; you can redistribute it and/or modify |
| 8 | it under the terms of the GNU General Public License as published by |
| 9 | the Free Software Foundation; either version 2 of the License, or |
| 10 | (at your option) any later version. |
| 11 | |
| 12 | This program 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 |
| 15 | GNU General Public License for more details. |
| 16 | |
| 17 | You should have received a copy of the GNU General Public License |
| 18 | along with this program; if not, write to the Free Software |
| 19 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA |
| 20 | 02111-1307, USA. */ |
| 21 | |
| 22 | #include "defs.h" |
| 23 | #include "tm.h" |
| 24 | #include "regcache.h" |
| 25 | #include <asm/ptrace.h> |
| 26 | #include <sys/ptrace.h> |
| 27 | #include <asm/processor.h> |
| 28 | #include <asm/types.h> |
| 29 | #include <sys/procfs.h> |
| 30 | #include <sys/user.h> |
| 31 | #include <value.h> |
| 32 | #include <sys/ucontext.h> |
| 33 | #ifndef offsetof |
| 34 | #define offsetof(type,member) ((size_t) &((type *)0)->member) |
| 35 | #endif |
| 36 | |
| 37 | |
| 38 | int |
| 39 | s390_register_u_addr (int blockend, int regnum) |
| 40 | { |
| 41 | int retval; |
| 42 | |
| 43 | if (regnum >= S390_GP0_REGNUM && regnum <= S390_GP_LAST_REGNUM) |
| 44 | retval = PT_GPR0 + ((regnum - S390_GP0_REGNUM) * S390_GPR_SIZE); |
| 45 | else if (regnum >= S390_PSWM_REGNUM && regnum <= S390_PC_REGNUM) |
| 46 | retval = PT_PSWMASK + ((regnum - S390_PSWM_REGNUM) * S390_PSW_MASK_SIZE); |
| 47 | else if (regnum == S390_FPC_REGNUM) |
| 48 | retval = PT_FPC; |
| 49 | else if (regnum >= S390_FP0_REGNUM && regnum <= S390_FPLAST_REGNUM) |
| 50 | retval = |
| 51 | #if CONFIG_ARCH_S390X |
| 52 | PT_FPR0 |
| 53 | #else |
| 54 | PT_FPR0_HI |
| 55 | #endif |
| 56 | + ((regnum - S390_FP0_REGNUM) * S390_FPR_SIZE); |
| 57 | else if (regnum >= S390_FIRST_ACR && regnum <= S390_LAST_ACR) |
| 58 | retval = PT_ACR0 + ((regnum - S390_FIRST_ACR) * S390_ACR_SIZE); |
| 59 | else if (regnum >= (S390_FIRST_CR + 9) && regnum <= (S390_FIRST_CR + 11)) |
| 60 | retval = PT_CR_9 + ((regnum - (S390_FIRST_CR + 9)) * S390_CR_SIZE); |
| 61 | else |
| 62 | { |
| 63 | internal_error (__FILE__, __LINE__, |
| 64 | "s390_register_u_addr invalid regnum regnum=%d", |
| 65 | regnum); |
| 66 | retval = 0; |
| 67 | } |
| 68 | return retval + blockend; |
| 69 | } |
| 70 | |
| 71 | /* watch_areas are required if you put 2 or more watchpoints on the same |
| 72 | address or overlapping areas gdb will call us to delete the watchpoint |
| 73 | more than once when we try to delete them. |
| 74 | attempted reference counting to reduce the number of areas unfortunately |
| 75 | they didn't shrink when areas had to be split overlapping occurs. */ |
| 76 | struct watch_area; |
| 77 | typedef struct watch_area watch_area; |
| 78 | struct watch_area |
| 79 | { |
| 80 | watch_area *next; |
| 81 | CORE_ADDR lo_addr; |
| 82 | CORE_ADDR hi_addr; |
| 83 | }; |
| 84 | |
| 85 | static watch_area *watch_base = NULL; |
| 86 | int watch_area_cnt = 0; |
| 87 | static CORE_ADDR watch_lo_addr = 0, watch_hi_addr = 0; |
| 88 | |
| 89 | |
| 90 | |
| 91 | CORE_ADDR |
| 92 | s390_stopped_by_watchpoint (int pid) |
| 93 | { |
| 94 | per_lowcore_bits per_lowcore; |
| 95 | ptrace_area parea; |
| 96 | |
| 97 | parea.len = sizeof (per_lowcore); |
| 98 | parea.process_addr = (addr_t) & per_lowcore; |
| 99 | parea.kernel_addr = offsetof (struct user_regs_struct, per_info.lowcore); |
| 100 | ptrace (PTRACE_PEEKUSR_AREA, pid, &parea); |
| 101 | return ((per_lowcore.perc_storage_alteration == 1) && |
| 102 | (per_lowcore.perc_store_real_address == 0)); |
| 103 | } |
| 104 | |
| 105 | |
| 106 | void |
| 107 | s390_fix_watch_points (int pid) |
| 108 | { |
| 109 | per_struct per_info; |
| 110 | ptrace_area parea; |
| 111 | |
| 112 | parea.len = sizeof (per_info); |
| 113 | parea.process_addr = (addr_t) & per_info; |
| 114 | parea.kernel_addr = PT_CR_9; |
| 115 | ptrace (PTRACE_PEEKUSR_AREA, pid, &parea); |
| 116 | /* The kernel automatically sets the psw for per depending */ |
| 117 | /* on whether the per control registers are set for event recording */ |
| 118 | /* & sets cr9 & cr10 appropriately also */ |
| 119 | if (watch_area_cnt) |
| 120 | { |
| 121 | per_info.control_regs.bits.em_storage_alteration = 1; |
| 122 | per_info.control_regs.bits.storage_alt_space_ctl = 1; |
| 123 | } |
| 124 | else |
| 125 | { |
| 126 | per_info.control_regs.bits.em_storage_alteration = 0; |
| 127 | per_info.control_regs.bits.storage_alt_space_ctl = 0; |
| 128 | } |
| 129 | per_info.starting_addr = watch_lo_addr; |
| 130 | per_info.ending_addr = watch_hi_addr; |
| 131 | ptrace (PTRACE_POKEUSR_AREA, pid, &parea); |
| 132 | } |
| 133 | |
| 134 | int |
| 135 | s390_insert_watchpoint (int pid, CORE_ADDR addr, int len, int rw) |
| 136 | { |
| 137 | CORE_ADDR hi_addr = addr + len - 1; |
| 138 | watch_area *newarea = (watch_area *) xmalloc (sizeof (watch_area)); |
| 139 | |
| 140 | |
| 141 | if (newarea) |
| 142 | { |
| 143 | newarea->next = watch_base; |
| 144 | watch_base = newarea; |
| 145 | watch_lo_addr = min (watch_lo_addr, addr); |
| 146 | watch_hi_addr = max (watch_hi_addr, hi_addr); |
| 147 | newarea->lo_addr = addr; |
| 148 | newarea->hi_addr = hi_addr; |
| 149 | if (watch_area_cnt == 0) |
| 150 | { |
| 151 | watch_lo_addr = newarea->lo_addr; |
| 152 | watch_hi_addr = newarea->hi_addr; |
| 153 | } |
| 154 | watch_area_cnt++; |
| 155 | s390_fix_watch_points (pid); |
| 156 | } |
| 157 | return newarea ? 0 : -1; |
| 158 | } |
| 159 | |
| 160 | |
| 161 | int |
| 162 | s390_remove_watchpoint (int pid, CORE_ADDR addr, int len) |
| 163 | { |
| 164 | watch_area *curr = watch_base, *prev, *matchCurr; |
| 165 | CORE_ADDR hi_addr = addr + len - 1; |
| 166 | CORE_ADDR watch_second_lo_addr = 0xffffffffUL, watch_second_hi_addr = 0; |
| 167 | int lo_addr_ref_cnt, hi_addr_ref_cnt; |
| 168 | prev = matchCurr = NULL; |
| 169 | lo_addr_ref_cnt = (addr == watch_lo_addr); |
| 170 | hi_addr_ref_cnt = (addr == watch_hi_addr); |
| 171 | while (curr) |
| 172 | { |
| 173 | if (matchCurr == NULL) |
| 174 | { |
| 175 | if (curr->lo_addr == addr && curr->hi_addr == hi_addr) |
| 176 | { |
| 177 | matchCurr = curr; |
| 178 | if (prev) |
| 179 | prev->next = curr->next; |
| 180 | else |
| 181 | watch_base = curr->next; |
| 182 | } |
| 183 | prev = curr; |
| 184 | } |
| 185 | if (lo_addr_ref_cnt) |
| 186 | { |
| 187 | if (watch_lo_addr == curr->lo_addr) |
| 188 | lo_addr_ref_cnt++; |
| 189 | if (curr->lo_addr > watch_lo_addr && |
| 190 | curr->lo_addr < watch_second_lo_addr) |
| 191 | watch_second_lo_addr = curr->lo_addr; |
| 192 | } |
| 193 | if (hi_addr_ref_cnt) |
| 194 | { |
| 195 | if (watch_hi_addr == curr->hi_addr) |
| 196 | hi_addr_ref_cnt++; |
| 197 | if (curr->hi_addr < watch_hi_addr && |
| 198 | curr->hi_addr > watch_second_hi_addr) |
| 199 | watch_second_hi_addr = curr->hi_addr; |
| 200 | } |
| 201 | curr = curr->next; |
| 202 | } |
| 203 | if (matchCurr) |
| 204 | { |
| 205 | xfree (matchCurr); |
| 206 | watch_area_cnt--; |
| 207 | if (watch_area_cnt) |
| 208 | { |
| 209 | if (lo_addr_ref_cnt == 2) |
| 210 | watch_lo_addr = watch_second_lo_addr; |
| 211 | if (hi_addr_ref_cnt == 2) |
| 212 | watch_hi_addr = watch_second_hi_addr; |
| 213 | } |
| 214 | else |
| 215 | { |
| 216 | watch_lo_addr = watch_hi_addr = 0; |
| 217 | } |
| 218 | s390_fix_watch_points (pid); |
| 219 | return 0; |
| 220 | } |
| 221 | else |
| 222 | { |
| 223 | fprintf_unfiltered (gdb_stderr, |
| 224 | "Attempt to remove nonexistent watchpoint in s390_remove_watchpoint\n"); |
| 225 | return -1; |
| 226 | } |
| 227 | } |
| 228 | |
| 229 | int |
| 230 | kernel_u_size (void) |
| 231 | { |
| 232 | return sizeof (struct user); |
| 233 | } |
| 234 | |
| 235 | |
| 236 | #if (defined (S390_FP0_REGNUM) && defined (HAVE_FPREGSET_T) && defined(HAVE_SYS_PROCFS_H) && defined (HAVE_GREGSET_T)) |
| 237 | void |
| 238 | supply_gregset (gregset_t * gregsetp) |
| 239 | { |
| 240 | int regi; |
| 241 | greg_t *gregp = (greg_t *) gregsetp; |
| 242 | |
| 243 | supply_register (S390_PSWM_REGNUM, (char *) &gregp[S390_PSWM_REGNUM]); |
| 244 | supply_register (S390_PC_REGNUM, (char *) &gregp[S390_PC_REGNUM]); |
| 245 | for (regi = 0; regi < S390_NUM_GPRS; regi++) |
| 246 | supply_register (S390_GP0_REGNUM + regi, |
| 247 | (char *) &gregp[S390_GP0_REGNUM + regi]); |
| 248 | |
| 249 | #if defined (CONFIG_ARCH_S390X) |
| 250 | /* On the s390x, each element of gregset_t is 8 bytes long, but |
| 251 | each access register is still only 32 bits long. So they're |
| 252 | packed two per element. It's apparently traditional that |
| 253 | gregset_t must be an array, so when the registers it provides |
| 254 | have different sizes, something has to get strange |
| 255 | somewhere. */ |
| 256 | { |
| 257 | unsigned int *acrs = (unsigned int *) &gregp[S390_FIRST_ACR]; |
| 258 | |
| 259 | for (regi = 0; regi < S390_NUM_ACRS; regi++) |
| 260 | supply_register (S390_FIRST_ACR + regi, (char *) &acrs[regi]); |
| 261 | } |
| 262 | #else |
| 263 | for (regi = 0; regi < S390_NUM_ACRS; regi++) |
| 264 | supply_register (S390_FIRST_ACR + regi, |
| 265 | (char *) &gregp[S390_FIRST_ACR + regi]); |
| 266 | #endif |
| 267 | |
| 268 | /* unfortunately this isn't in gregsetp */ |
| 269 | for (regi = 0; regi < S390_NUM_CRS; regi++) |
| 270 | supply_register (S390_FIRST_CR + regi, NULL); |
| 271 | } |
| 272 | |
| 273 | |
| 274 | void |
| 275 | supply_fpregset (fpregset_t * fpregsetp) |
| 276 | { |
| 277 | int regi; |
| 278 | |
| 279 | supply_register (S390_FPC_REGNUM, (char *) &fpregsetp->fpc); |
| 280 | for (regi = 0; regi < S390_NUM_FPRS; regi++) |
| 281 | supply_register (S390_FP0_REGNUM + regi, (char *) &fpregsetp->fprs[regi]); |
| 282 | |
| 283 | } |
| 284 | |
| 285 | void |
| 286 | fill_gregset (gregset_t * gregsetp, int regno) |
| 287 | { |
| 288 | int regi; |
| 289 | greg_t *gregp = (greg_t *) gregsetp; |
| 290 | |
| 291 | if (regno < 0) |
| 292 | { |
| 293 | regcache_collect (S390_PSWM_REGNUM, &gregp[S390_PSWM_REGNUM]); |
| 294 | regcache_collect (S390_PC_REGNUM, &gregp[S390_PC_REGNUM]); |
| 295 | for (regi = 0; regi < S390_NUM_GPRS; regi++) |
| 296 | regcache_collect (S390_GP0_REGNUM + regi, |
| 297 | &gregp[S390_GP0_REGNUM + regi]); |
| 298 | #if defined (CONFIG_ARCH_S390X) |
| 299 | /* See the comments about the access registers in |
| 300 | supply_gregset, above. */ |
| 301 | { |
| 302 | unsigned int *acrs = (unsigned int *) &gregp[S390_FIRST_ACR]; |
| 303 | |
| 304 | for (regi = 0; regi < S390_NUM_ACRS; regi++) |
| 305 | regcache_collect (S390_FIRST_ACR + regi, &acrs[regi]); |
| 306 | } |
| 307 | #else |
| 308 | for (regi = 0; regi < S390_NUM_ACRS; regi++) |
| 309 | regcache_collect (S390_FIRST_ACR + regi, |
| 310 | &gregp[S390_FIRST_ACR + regi]); |
| 311 | #endif |
| 312 | } |
| 313 | else if (regno >= S390_PSWM_REGNUM && regno < S390_FIRST_ACR) |
| 314 | regcache_collect (regno, &gregp[regno]); |
| 315 | else if (regno >= S390_FIRST_ACR && regno <= S390_LAST_ACR) |
| 316 | { |
| 317 | #if defined (CONFIG_ARCH_S390X) |
| 318 | /* See the comments about the access registers in |
| 319 | supply_gregset, above. */ |
| 320 | unsigned int *acrs = (unsigned int *) &gregp[S390_FIRST_ACR]; |
| 321 | |
| 322 | regcache_collect (regno, &acrs[regno - S390_FIRST_ACR]); |
| 323 | #else |
| 324 | regcache_collect (regno, &gregp[regno]); |
| 325 | #endif |
| 326 | } |
| 327 | } |
| 328 | |
| 329 | /* Given a pointer to a floating point register set in /proc format |
| 330 | (fpregset_t *), update the register specified by REGNO from gdb's idea |
| 331 | of the current floating point register set. If REGNO is -1, update |
| 332 | them all. */ |
| 333 | |
| 334 | void |
| 335 | fill_fpregset (fpregset_t * fpregsetp, int regno) |
| 336 | { |
| 337 | int regi; |
| 338 | |
| 339 | if (regno < 0) |
| 340 | { |
| 341 | regcache_collect (S390_FPC_REGNUM, &fpregsetp->fpc); |
| 342 | for (regi = 0; regi < S390_NUM_FPRS; regi++) |
| 343 | regcache_collect (S390_FP0_REGNUM + regi, &fpregsetp->fprs[regi]); |
| 344 | } |
| 345 | else if (regno == S390_FPC_REGNUM) |
| 346 | regcache_collect (S390_FPC_REGNUM, &fpregsetp->fpc); |
| 347 | else if (regno >= S390_FP0_REGNUM && regno <= S390_FPLAST_REGNUM) |
| 348 | regcache_collect (regno, &fpregsetp->fprs[regno - S390_FP0_REGNUM]); |
| 349 | } |
| 350 | |
| 351 | |
| 352 | #else |
| 353 | #error "There are a few possibilities here" |
| 354 | #error "1) You aren't compiling for linux & don't need a core dumps to work." |
| 355 | #error "2) The header files sys/elf.h sys/user.h sys/ptrace.h & sys/procfs.h" |
| 356 | #error "libc files are inconsistent with linux/include/asm-s390/" |
| 357 | #error "3) you didn't do a completely clean build & delete config.cache." |
| 358 | #endif |