| 1 | /* Remote target communications for the Macraigor Systems BDM Wiggler |
| 2 | talking to a Motorola PPC 8xx ADS board |
| 3 | Copyright 1996, 1997, 1998, 1999, 2000, 2001 |
| 4 | Free Software Foundation, Inc. |
| 5 | |
| 6 | This file is part of GDB. |
| 7 | |
| 8 | This program is free software; you can redistribute it and/or modify |
| 9 | it under the terms of the GNU General Public License as published by |
| 10 | the Free Software Foundation; either version 2 of the License, or |
| 11 | (at your option) any later version. |
| 12 | |
| 13 | This program is distributed in the hope that it will be useful, |
| 14 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | GNU General Public License for more details. |
| 17 | |
| 18 | You should have received a copy of the GNU General Public License |
| 19 | along with this program; if not, write to the Free Software |
| 20 | Foundation, Inc., 59 Temple Place - Suite 330, |
| 21 | Boston, MA 02111-1307, USA. */ |
| 22 | |
| 23 | #include "defs.h" |
| 24 | #include "gdbcore.h" |
| 25 | #include "gdb_string.h" |
| 26 | #include <fcntl.h> |
| 27 | #include "frame.h" |
| 28 | #include "inferior.h" |
| 29 | #include "bfd.h" |
| 30 | #include "symfile.h" |
| 31 | #include "target.h" |
| 32 | #include "gdbcmd.h" |
| 33 | #include "objfiles.h" |
| 34 | #include "gdb-stabs.h" |
| 35 | #include <sys/types.h> |
| 36 | #include "serial.h" |
| 37 | #include "ocd.h" |
| 38 | #include "ppc-tdep.h" |
| 39 | #include "regcache.h" |
| 40 | #include "gdb_assert.h" |
| 41 | |
| 42 | static void bdm_ppc_open (char *name, int from_tty); |
| 43 | |
| 44 | static ptid_t bdm_ppc_wait (ptid_t ptid, |
| 45 | struct target_waitstatus *target_status); |
| 46 | |
| 47 | static void bdm_ppc_fetch_registers (int regno); |
| 48 | |
| 49 | static void bdm_ppc_store_registers (int regno); |
| 50 | |
| 51 | extern struct target_ops bdm_ppc_ops; /* Forward decl */ |
| 52 | \f |
| 53 | /*#define BDM_NUM_REGS 71 */ |
| 54 | #define BDM_NUM_REGS 24 |
| 55 | |
| 56 | #define BDM_REGMAP \ |
| 57 | 2048, 2049, 2050, 2051, 2052, 2053, 2054, 2055, /* r0-r7 */ \ |
| 58 | 2056, 2057, 2058, 2059, 2060, 2061, 2062, 2063, /* r8-r15 */ \ |
| 59 | 2064, 2065, 2066, 2067, 2068, 2069, 2070, 2071, /* r16-r23 */ \ |
| 60 | 2072, 2073, 2074, 2075, 2076, 2077, 2078, 2079, /* r24-r31 */ \ |
| 61 | \ |
| 62 | 2080, 2082, 2084, 2086, 2088, 2090, 2092, 2094, /* fp0->fp8 */ \ |
| 63 | 2096, 2098, 2100, 2102, 2104, 2106, 2108, 2110, /* fp0->fp8 */ \ |
| 64 | 2112, 2114, 2116, 2118, 2120, 2122, 2124, 2126, /* fp0->fp8 */ \ |
| 65 | 2128, 2130, 2132, 2134, 2136, 2138, 2140, 2142, /* fp0->fp8 */ \ |
| 66 | \ |
| 67 | 26, /* pc (SRR0 (SPR 26)) */ \ |
| 68 | 2146, /* ps (MSR) */ \ |
| 69 | 2144, /* cnd (CR) */ \ |
| 70 | 8, /* lr (SPR 8) */ \ |
| 71 | 9, /* cnt (CTR (SPR 9)) */ \ |
| 72 | 1, /* xer (SPR 1) */ \ |
| 73 | 0, /* mq (SPR 0) */ |
| 74 | \f |
| 75 | |
| 76 | char nowatchdog[4] = |
| 77 | {0xff, 0xff, 0xff, 0x88}; |
| 78 | |
| 79 | /* Open a connection to a remote debugger. |
| 80 | NAME is the filename used for communication. */ |
| 81 | |
| 82 | static void |
| 83 | bdm_ppc_open (char *name, int from_tty) |
| 84 | { |
| 85 | CORE_ADDR watchdogaddr = 0xff000004; |
| 86 | |
| 87 | ocd_open (name, from_tty, OCD_TARGET_MOTO_PPC, &bdm_ppc_ops); |
| 88 | |
| 89 | /* We want interrupts to drop us into debugging mode. */ |
| 90 | /* Modify the DER register to accomplish this. */ |
| 91 | ocd_write_bdm_register (149, 0x20024000); |
| 92 | |
| 93 | /* Disable watchdog timer on the board */ |
| 94 | ocd_write_bytes (watchdogaddr, nowatchdog, 4); |
| 95 | } |
| 96 | |
| 97 | /* Wait until the remote machine stops, then return, |
| 98 | storing status in STATUS just as `wait' would. |
| 99 | Returns "pid" (though it's not clear what, if anything, that |
| 100 | means in the case of this target). */ |
| 101 | |
| 102 | static ptid_t |
| 103 | bdm_ppc_wait (ptid_t ptid, struct target_waitstatus *target_status) |
| 104 | { |
| 105 | int stop_reason; |
| 106 | |
| 107 | target_status->kind = TARGET_WAITKIND_STOPPED; |
| 108 | |
| 109 | stop_reason = ocd_wait (); |
| 110 | |
| 111 | if (stop_reason) |
| 112 | { |
| 113 | target_status->value.sig = TARGET_SIGNAL_INT; |
| 114 | return inferior_ptid; |
| 115 | } |
| 116 | |
| 117 | target_status->value.sig = TARGET_SIGNAL_TRAP; /* XXX for now */ |
| 118 | |
| 119 | #if 0 |
| 120 | { |
| 121 | unsigned long ecr, der; |
| 122 | |
| 123 | ecr = ocd_read_bdm_register (148); /* Read the exception cause register */ |
| 124 | der = ocd_read_bdm_register (149); /* Read the debug enables register */ |
| 125 | fprintf_unfiltered (gdb_stdout, "ecr = 0x%x, der = 0x%x\n", ecr, der); |
| 126 | } |
| 127 | #endif |
| 128 | |
| 129 | return inferior_ptid; |
| 130 | } |
| 131 | \f |
| 132 | static int bdm_regmap[] = |
| 133 | {BDM_REGMAP}; |
| 134 | |
| 135 | /* Read the remote registers into regs. |
| 136 | Fetch register REGNO, or all registers if REGNO == -1 |
| 137 | |
| 138 | The Wiggler uses the following codes to access the registers: |
| 139 | |
| 140 | 0 -> 1023 SPR 0 -> 1023 |
| 141 | 0 - SPR 0 - MQ |
| 142 | 1 - SPR 1 - XER |
| 143 | 8 - SPR 8 - LR |
| 144 | 9 - SPR 9 - CTR (known as cnt in GDB) |
| 145 | 26 - SPR 26 - SRR0 - pc |
| 146 | 1024 -> 2047 DCR 0 -> DCR 1023 (IBM PPC 4xx only) |
| 147 | 2048 -> 2079 R0 -> R31 |
| 148 | 2080 -> 2143 FP0 -> FP31 (64 bit regs) (IBM PPC 5xx only) |
| 149 | 2144 CR (known as cnd in GDB) |
| 150 | 2145 FPCSR |
| 151 | 2146 MSR (known as ps in GDB) |
| 152 | */ |
| 153 | |
| 154 | static void |
| 155 | bdm_ppc_fetch_registers (int regno) |
| 156 | { |
| 157 | struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); |
| 158 | int i; |
| 159 | unsigned char *regs; |
| 160 | int first_regno, last_regno; |
| 161 | int first_bdm_regno, last_bdm_regno; |
| 162 | int reglen; |
| 163 | |
| 164 | if (regno == -1) |
| 165 | { |
| 166 | first_regno = 0; |
| 167 | last_regno = NUM_REGS - 1; |
| 168 | |
| 169 | first_bdm_regno = 0; |
| 170 | last_bdm_regno = BDM_NUM_REGS - 1; |
| 171 | } |
| 172 | else |
| 173 | { |
| 174 | first_regno = regno; |
| 175 | last_regno = regno; |
| 176 | |
| 177 | first_bdm_regno = bdm_regmap[regno]; |
| 178 | last_bdm_regno = bdm_regmap[regno]; |
| 179 | } |
| 180 | |
| 181 | if (first_bdm_regno == -1) |
| 182 | { |
| 183 | regcache_raw_supply (current_regcache, first_regno, NULL); |
| 184 | return; /* Unsupported register */ |
| 185 | } |
| 186 | |
| 187 | /* FIXME: jimb/2004-05-04: I'm not sure how to adapt this code to |
| 188 | processors that lack floating point registers, and I don't have |
| 189 | have the equipment to test it. So we'll leave that case for the |
| 190 | next person who encounters it. */ |
| 191 | gdb_assert (ppc_floating_point_unit_p (current_gdbarch)); |
| 192 | |
| 193 | #if 1 |
| 194 | /* Can't ask for floating point regs on ppc 8xx, also need to |
| 195 | avoid asking for the mq register. */ |
| 196 | if (first_regno == last_regno) /* only want one reg */ |
| 197 | { |
| 198 | /* printf("Asking for register %d\n", first_regno); */ |
| 199 | |
| 200 | /* if asking for an invalid register */ |
| 201 | if ((first_regno == gdbarch_tdep (current_gdbarch)->ppc_mq_regnum) |
| 202 | || (first_regno == gdbarch_tdep (current_gdbarch)->ppc_fpscr_regnum) |
| 203 | || ((first_regno >= tdep->ppc_fp0_regnum) |
| 204 | && (first_regno < tdep->ppc_fp0_regnum + ppc_num_fprs))) |
| 205 | { |
| 206 | /* printf("invalid reg request!\n"); */ |
| 207 | regcache_raw_supply (current_regcache, first_regno, NULL); |
| 208 | return; /* Unsupported register */ |
| 209 | } |
| 210 | else |
| 211 | { |
| 212 | regs = ocd_read_bdm_registers (first_bdm_regno, |
| 213 | last_bdm_regno, ®len); |
| 214 | } |
| 215 | } |
| 216 | else |
| 217 | internal_error (__FILE__, __LINE__, |
| 218 | "ppc_bdm_fetch_registers: " |
| 219 | "'all registers' case not implemented"); |
| 220 | |
| 221 | #endif |
| 222 | #if 0 |
| 223 | regs = ocd_read_bdm_registers (first_bdm_regno, last_bdm_regno, ®len); |
| 224 | #endif |
| 225 | |
| 226 | for (i = first_regno; i <= last_regno; i++) |
| 227 | { |
| 228 | int bdm_regno, regoffset; |
| 229 | |
| 230 | bdm_regno = bdm_regmap[i]; |
| 231 | if (bdm_regno != -1) |
| 232 | { |
| 233 | regoffset = bdm_regno - first_bdm_regno; |
| 234 | |
| 235 | if (regoffset >= reglen / 4) |
| 236 | continue; |
| 237 | |
| 238 | regcache_raw_supply (current_regcache, i, regs + 4 * regoffset); |
| 239 | } |
| 240 | else |
| 241 | regcache_raw_supply (current_regcache, i, NULL); /* Unsupported register */ |
| 242 | } |
| 243 | } |
| 244 | |
| 245 | /* Store register REGNO, or all registers if REGNO == -1, from the contents |
| 246 | of REGISTERS. FIXME: ignores errors. */ |
| 247 | |
| 248 | static void |
| 249 | bdm_ppc_store_registers (int regno) |
| 250 | { |
| 251 | struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); |
| 252 | int i; |
| 253 | int first_regno, last_regno; |
| 254 | int first_bdm_regno, last_bdm_regno; |
| 255 | |
| 256 | if (regno == -1) |
| 257 | { |
| 258 | first_regno = 0; |
| 259 | last_regno = NUM_REGS - 1; |
| 260 | |
| 261 | first_bdm_regno = 0; |
| 262 | last_bdm_regno = BDM_NUM_REGS - 1; |
| 263 | } |
| 264 | else |
| 265 | { |
| 266 | first_regno = regno; |
| 267 | last_regno = regno; |
| 268 | |
| 269 | first_bdm_regno = bdm_regmap[regno]; |
| 270 | last_bdm_regno = bdm_regmap[regno]; |
| 271 | } |
| 272 | |
| 273 | if (first_bdm_regno == -1) |
| 274 | return; /* Unsupported register */ |
| 275 | |
| 276 | /* FIXME: jimb/2004-05-04: I'm not sure how to adapt this code to |
| 277 | processors that lack floating point registers, and I don't have |
| 278 | have the equipment to test it. So we'll leave that case for the |
| 279 | next person who encounters it. */ |
| 280 | gdb_assert (ppc_floating_point_unit_p (current_gdbarch)); |
| 281 | |
| 282 | for (i = first_regno; i <= last_regno; i++) |
| 283 | { |
| 284 | int bdm_regno; |
| 285 | |
| 286 | bdm_regno = bdm_regmap[i]; |
| 287 | |
| 288 | /* only attempt to write if it's a valid ppc 8xx register */ |
| 289 | /* (need to avoid FP regs and MQ reg) */ |
| 290 | if ((i != gdbarch_tdep (current_gdbarch)->ppc_mq_regnum) |
| 291 | && (i != gdbarch_tdep (current_gdbarch)->ppc_fpscr_regnum) |
| 292 | && ((i < tdep->ppc_fp0_regnum) |
| 293 | || (i >= tdep->ppc_fp0_regnum + ppc_num_fprs))) |
| 294 | { |
| 295 | /* printf("write valid reg %d\n", bdm_regno); */ |
| 296 | ocd_write_bdm_registers (bdm_regno, deprecated_registers + DEPRECATED_REGISTER_BYTE (i), 4); |
| 297 | } |
| 298 | /* |
| 299 | else if (i == gdbarch_tdep (current_gdbarch)->ppc_mq_regnum) |
| 300 | printf("don't write invalid reg %d (PPC_MQ_REGNUM)\n", bdm_regno); |
| 301 | else |
| 302 | printf("don't write invalid reg %d\n", bdm_regno); |
| 303 | */ |
| 304 | } |
| 305 | } |
| 306 | \f |
| 307 | /* Define the target subroutine names */ |
| 308 | |
| 309 | struct target_ops bdm_ppc_ops; |
| 310 | |
| 311 | static void |
| 312 | init_bdm_ppc_ops (void) |
| 313 | { |
| 314 | bdm_ppc_ops.to_shortname = "ocd"; |
| 315 | bdm_ppc_ops.to_longname = "Remote target with On-Chip Debugging"; |
| 316 | bdm_ppc_ops.to_doc = "Use a remote target with On-Chip Debugging. To use a target box;\n\ |
| 317 | specify the serial device it is connected to (e.g. /dev/ttya). To use\n\ |
| 318 | a wiggler, specify wiggler and then the port it is connected to\n\ |
| 319 | (e.g. wiggler lpt1)."; /* to_doc */ |
| 320 | bdm_ppc_ops.to_open = bdm_ppc_open; |
| 321 | bdm_ppc_ops.to_close = ocd_close; |
| 322 | bdm_ppc_ops.to_detach = ocd_detach; |
| 323 | bdm_ppc_ops.to_resume = ocd_resume; |
| 324 | bdm_ppc_ops.to_wait = bdm_ppc_wait; |
| 325 | bdm_ppc_ops.to_fetch_registers = bdm_ppc_fetch_registers; |
| 326 | bdm_ppc_ops.to_store_registers = bdm_ppc_store_registers; |
| 327 | bdm_ppc_ops.to_prepare_to_store = ocd_prepare_to_store; |
| 328 | bdm_ppc_ops.deprecated_xfer_memory = ocd_xfer_memory; |
| 329 | bdm_ppc_ops.to_files_info = ocd_files_info; |
| 330 | bdm_ppc_ops.to_insert_breakpoint = ocd_insert_breakpoint; |
| 331 | bdm_ppc_ops.to_remove_breakpoint = ocd_remove_breakpoint; |
| 332 | bdm_ppc_ops.to_kill = ocd_kill; |
| 333 | bdm_ppc_ops.to_load = ocd_load; |
| 334 | bdm_ppc_ops.to_create_inferior = ocd_create_inferior; |
| 335 | bdm_ppc_ops.to_mourn_inferior = ocd_mourn; |
| 336 | bdm_ppc_ops.to_thread_alive = ocd_thread_alive; |
| 337 | bdm_ppc_ops.to_stop = ocd_stop; |
| 338 | bdm_ppc_ops.to_stratum = process_stratum; |
| 339 | bdm_ppc_ops.to_has_all_memory = 1; |
| 340 | bdm_ppc_ops.to_has_memory = 1; |
| 341 | bdm_ppc_ops.to_has_stack = 1; |
| 342 | bdm_ppc_ops.to_has_registers = 1; |
| 343 | bdm_ppc_ops.to_has_execution = 1; |
| 344 | bdm_ppc_ops.to_magic = OPS_MAGIC; |
| 345 | } /* init_bdm_ppc_ops */ |
| 346 | |
| 347 | extern initialize_file_ftype _initialize_bdm_ppc; /* -Wmissing-prototypes */ |
| 348 | |
| 349 | void |
| 350 | _initialize_bdm_ppc (void) |
| 351 | { |
| 352 | init_bdm_ppc_ops (); |
| 353 | add_target (&bdm_ppc_ops); |
| 354 | } |