| 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 <sys/procfs.h> |
| 29 | #include <sys/user.h> |
| 30 | #include <value.h> |
| 31 | #include <sys/ucontext.h> |
| 32 | #ifndef offsetof |
| 33 | #define offsetof(type,member) ((size_t) &((type *)0)->member) |
| 34 | #endif |
| 35 | |
| 36 | |
| 37 | int |
| 38 | s390_register_u_addr (int blockend, int regnum) |
| 39 | { |
| 40 | int retval; |
| 41 | |
| 42 | if (regnum >= S390_GP0_REGNUM && regnum <= S390_GP_LAST_REGNUM) |
| 43 | retval = PT_GPR0 + ((regnum - S390_GP0_REGNUM) * S390_GPR_SIZE); |
| 44 | else if (regnum >= S390_PSWM_REGNUM && regnum <= S390_PC_REGNUM) |
| 45 | retval = PT_PSWMASK + ((regnum - S390_PSWM_REGNUM) * S390_PSW_MASK_SIZE); |
| 46 | else if (regnum == S390_FPC_REGNUM) |
| 47 | retval = PT_FPC; |
| 48 | else if (regnum >= S390_FP0_REGNUM && regnum <= S390_FPLAST_REGNUM) |
| 49 | retval = |
| 50 | #if CONFIG_ARCH_S390X |
| 51 | PT_FPR0 |
| 52 | #else |
| 53 | PT_FPR0_HI |
| 54 | #endif |
| 55 | + ((regnum - S390_FP0_REGNUM) * S390_FPR_SIZE); |
| 56 | else if (regnum >= S390_FIRST_ACR && regnum <= S390_LAST_ACR) |
| 57 | retval = PT_ACR0 + ((regnum - S390_FIRST_ACR) * S390_ACR_SIZE); |
| 58 | else if (regnum >= (S390_FIRST_CR + 9) && regnum <= (S390_FIRST_CR + 11)) |
| 59 | retval = PT_CR_9 + ((regnum - (S390_FIRST_CR + 9)) * S390_CR_SIZE); |
| 60 | else |
| 61 | { |
| 62 | #ifdef GDBSERVER |
| 63 | error ("s390_register_u_addr invalid regnum %s %d regnum=%d", |
| 64 | __FILE__, (int) __LINE__, regnum); |
| 65 | #else |
| 66 | internal_error (__FILE__, __LINE__, |
| 67 | "s390_register_u_addr invalid regnum regnum=%d", |
| 68 | regnum); |
| 69 | #endif |
| 70 | retval = 0; |
| 71 | } |
| 72 | return retval + blockend; |
| 73 | } |
| 74 | |
| 75 | #ifndef GDBSERVER |
| 76 | /* watch_areas are required if you put 2 or more watchpoints on the same |
| 77 | address or overlapping areas gdb will call us to delete the watchpoint |
| 78 | more than once when we try to delete them. |
| 79 | attempted reference counting to reduce the number of areas unfortunately |
| 80 | they didn't shrink when areas had to be split overlapping occurs. */ |
| 81 | struct watch_area; |
| 82 | typedef struct watch_area watch_area; |
| 83 | struct watch_area |
| 84 | { |
| 85 | watch_area *next; |
| 86 | CORE_ADDR lo_addr; |
| 87 | CORE_ADDR hi_addr; |
| 88 | }; |
| 89 | |
| 90 | static watch_area *watch_base = NULL; |
| 91 | int watch_area_cnt = 0; |
| 92 | static CORE_ADDR watch_lo_addr = 0, watch_hi_addr = 0; |
| 93 | |
| 94 | |
| 95 | |
| 96 | CORE_ADDR |
| 97 | s390_stopped_by_watchpoint (int pid) |
| 98 | { |
| 99 | per_lowcore_bits per_lowcore; |
| 100 | ptrace_area parea; |
| 101 | |
| 102 | parea.len = sizeof (per_lowcore); |
| 103 | parea.process_addr = (addr_t) & per_lowcore; |
| 104 | parea.kernel_addr = offsetof (struct user_regs_struct, per_info.lowcore); |
| 105 | ptrace (PTRACE_PEEKUSR_AREA, pid, &parea); |
| 106 | return ((per_lowcore.perc_storage_alteration == 1) && |
| 107 | (per_lowcore.perc_store_real_address == 0)); |
| 108 | } |
| 109 | |
| 110 | |
| 111 | void |
| 112 | s390_fix_watch_points (int pid) |
| 113 | { |
| 114 | per_struct per_info; |
| 115 | ptrace_area parea; |
| 116 | |
| 117 | parea.len = sizeof (per_info); |
| 118 | parea.process_addr = (addr_t) & per_info; |
| 119 | parea.kernel_addr = PT_CR_9; |
| 120 | ptrace (PTRACE_PEEKUSR_AREA, pid, &parea); |
| 121 | /* The kernel automatically sets the psw for per depending */ |
| 122 | /* on whether the per control registers are set for event recording */ |
| 123 | /* & sets cr9 & cr10 appropriately also */ |
| 124 | if (watch_area_cnt) |
| 125 | { |
| 126 | per_info.control_regs.bits.em_storage_alteration = 1; |
| 127 | per_info.control_regs.bits.storage_alt_space_ctl = 1; |
| 128 | } |
| 129 | else |
| 130 | { |
| 131 | per_info.control_regs.bits.em_storage_alteration = 0; |
| 132 | per_info.control_regs.bits.storage_alt_space_ctl = 0; |
| 133 | } |
| 134 | per_info.starting_addr = watch_lo_addr; |
| 135 | per_info.ending_addr = watch_hi_addr; |
| 136 | ptrace (PTRACE_POKEUSR_AREA, pid, &parea); |
| 137 | } |
| 138 | |
| 139 | int |
| 140 | s390_insert_watchpoint (int pid, CORE_ADDR addr, int len, int rw) |
| 141 | { |
| 142 | CORE_ADDR hi_addr = addr + len - 1; |
| 143 | watch_area *newarea = (watch_area *) xmalloc (sizeof (watch_area)); |
| 144 | |
| 145 | |
| 146 | if (newarea) |
| 147 | { |
| 148 | newarea->next = watch_base; |
| 149 | watch_base = newarea; |
| 150 | watch_lo_addr = min (watch_lo_addr, addr); |
| 151 | watch_hi_addr = max (watch_hi_addr, hi_addr); |
| 152 | newarea->lo_addr = addr; |
| 153 | newarea->hi_addr = hi_addr; |
| 154 | if (watch_area_cnt == 0) |
| 155 | { |
| 156 | watch_lo_addr = newarea->lo_addr; |
| 157 | watch_hi_addr = newarea->hi_addr; |
| 158 | } |
| 159 | watch_area_cnt++; |
| 160 | s390_fix_watch_points (pid); |
| 161 | } |
| 162 | return newarea ? 0 : -1; |
| 163 | } |
| 164 | |
| 165 | |
| 166 | int |
| 167 | s390_remove_watchpoint (int pid, CORE_ADDR addr, int len) |
| 168 | { |
| 169 | watch_area *curr = watch_base, *prev, *matchCurr; |
| 170 | CORE_ADDR hi_addr = addr + len - 1; |
| 171 | CORE_ADDR watch_second_lo_addr = 0xffffffffUL, watch_second_hi_addr = 0; |
| 172 | int lo_addr_ref_cnt, hi_addr_ref_cnt; |
| 173 | prev = matchCurr = NULL; |
| 174 | lo_addr_ref_cnt = (addr == watch_lo_addr); |
| 175 | hi_addr_ref_cnt = (addr == watch_hi_addr); |
| 176 | while (curr) |
| 177 | { |
| 178 | if (matchCurr == NULL) |
| 179 | { |
| 180 | if (curr->lo_addr == addr && curr->hi_addr == hi_addr) |
| 181 | { |
| 182 | matchCurr = curr; |
| 183 | if (prev) |
| 184 | prev->next = curr->next; |
| 185 | else |
| 186 | watch_base = curr->next; |
| 187 | } |
| 188 | prev = curr; |
| 189 | } |
| 190 | if (lo_addr_ref_cnt) |
| 191 | { |
| 192 | if (watch_lo_addr == curr->lo_addr) |
| 193 | lo_addr_ref_cnt++; |
| 194 | if (curr->lo_addr > watch_lo_addr && |
| 195 | curr->lo_addr < watch_second_lo_addr) |
| 196 | watch_second_lo_addr = curr->lo_addr; |
| 197 | } |
| 198 | if (hi_addr_ref_cnt) |
| 199 | { |
| 200 | if (watch_hi_addr == curr->hi_addr) |
| 201 | hi_addr_ref_cnt++; |
| 202 | if (curr->hi_addr < watch_hi_addr && |
| 203 | curr->hi_addr > watch_second_hi_addr) |
| 204 | watch_second_hi_addr = curr->hi_addr; |
| 205 | } |
| 206 | curr = curr->next; |
| 207 | } |
| 208 | if (matchCurr) |
| 209 | { |
| 210 | xfree (matchCurr); |
| 211 | watch_area_cnt--; |
| 212 | if (watch_area_cnt) |
| 213 | { |
| 214 | if (lo_addr_ref_cnt == 2) |
| 215 | watch_lo_addr = watch_second_lo_addr; |
| 216 | if (hi_addr_ref_cnt == 2) |
| 217 | watch_hi_addr = watch_second_hi_addr; |
| 218 | } |
| 219 | else |
| 220 | { |
| 221 | watch_lo_addr = watch_hi_addr = 0; |
| 222 | } |
| 223 | s390_fix_watch_points (pid); |
| 224 | return 0; |
| 225 | } |
| 226 | else |
| 227 | { |
| 228 | fprintf_unfiltered (gdb_stderr, |
| 229 | "Attempt to remove nonexistent watchpoint in s390_remove_watchpoint\n"); |
| 230 | return -1; |
| 231 | } |
| 232 | } |
| 233 | |
| 234 | int |
| 235 | kernel_u_size (void) |
| 236 | { |
| 237 | return sizeof (struct user); |
| 238 | } |
| 239 | |
| 240 | |
| 241 | #if (defined (S390_FP0_REGNUM) && defined (HAVE_FPREGSET_T) && defined(HAVE_SYS_PROCFS_H) && defined (HAVE_GREGSET_T)) |
| 242 | void |
| 243 | supply_gregset (gregset_t * gregsetp) |
| 244 | { |
| 245 | int regi; |
| 246 | greg_t *gregp = (greg_t *) gregsetp; |
| 247 | |
| 248 | supply_register (S390_PSWM_REGNUM, (char *) &gregp[S390_PSWM_REGNUM]); |
| 249 | supply_register (S390_PC_REGNUM, (char *) &gregp[S390_PC_REGNUM]); |
| 250 | for (regi = 0; regi < S390_NUM_GPRS; regi++) |
| 251 | supply_register (S390_GP0_REGNUM + regi, |
| 252 | (char *) &gregp[S390_GP0_REGNUM + regi]); |
| 253 | for (regi = 0; regi < S390_NUM_ACRS; regi++) |
| 254 | supply_register (S390_FIRST_ACR + regi, |
| 255 | (char *) &gregp[S390_FIRST_ACR + regi]); |
| 256 | /* unfortunately this isn't in gregsetp */ |
| 257 | for (regi = 0; regi < S390_NUM_CRS; regi++) |
| 258 | supply_register (S390_FIRST_CR + regi, NULL); |
| 259 | } |
| 260 | |
| 261 | |
| 262 | void |
| 263 | supply_fpregset (fpregset_t * fpregsetp) |
| 264 | { |
| 265 | int regi; |
| 266 | |
| 267 | supply_register (S390_FPC_REGNUM, (char *) &fpregsetp->fpc); |
| 268 | for (regi = 0; regi < S390_NUM_FPRS; regi++) |
| 269 | supply_register (S390_FP0_REGNUM + regi, (char *) &fpregsetp->fprs[regi]); |
| 270 | |
| 271 | } |
| 272 | |
| 273 | void |
| 274 | fill_gregset (gregset_t * gregsetp, int regno) |
| 275 | { |
| 276 | greg_t *gregp = (greg_t *) gregsetp; |
| 277 | |
| 278 | if (regno >= S390_FIRST_CR && regno <= S390_LAST_CR) |
| 279 | supply_register (regno, NULL); |
| 280 | else if (regno != -1) |
| 281 | supply_register (regno, (char *) &gregp[regno]); |
| 282 | else |
| 283 | supply_gregset (gregsetp); |
| 284 | } |
| 285 | |
| 286 | /* Given a pointer to a floating point register set in /proc format |
| 287 | (fpregset_t *), update the register specified by REGNO from gdb's idea |
| 288 | of the current floating point register set. If REGNO is -1, update |
| 289 | them all. */ |
| 290 | |
| 291 | void |
| 292 | fill_fpregset (fpregset_t * fpregsetp, int regno) |
| 293 | { |
| 294 | if (regno == -1) |
| 295 | supply_fpregset (fpregsetp); |
| 296 | else |
| 297 | supply_register (regno, |
| 298 | &((char *) fpregsetp)[REGISTER_BYTE (regno) - |
| 299 | REGISTER_BYTE (S390_FPC_REGNUM)]); |
| 300 | } |
| 301 | |
| 302 | |
| 303 | #else |
| 304 | #error "There are a few possibilities here" |
| 305 | #error "1) You aren't compiling for linux & don't need a core dumps to work." |
| 306 | #error "2) The header files sys/elf.h sys/user.h sys/ptrace.h & sys/procfs.h" |
| 307 | #error "libc files are inconsistent with linux/include/asm-s390/" |
| 308 | #error "3) you didn't do a completely clean build & delete config.cache." |
| 309 | #endif |
| 310 | #endif /* GDBSERVER */ |