| 1 | /* Target-dependent code for PowerPC systems using the SVR4 ABI |
| 2 | for GDB, the GNU debugger. |
| 3 | |
| 4 | Copyright (C) 2000, 2001, 2002, 2003, 2005 |
| 5 | Free Software Foundation, Inc. |
| 6 | |
| 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 |
| 11 | the Free Software Foundation; either version 2 of the License, or |
| 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 |
| 20 | along with this program; if not, write to the Free Software |
| 21 | Foundation, Inc., 51 Franklin Street, Fifth Floor, |
| 22 | Boston, MA 02110-1301, USA. */ |
| 23 | |
| 24 | #include "defs.h" |
| 25 | #include "gdbcore.h" |
| 26 | #include "inferior.h" |
| 27 | #include "regcache.h" |
| 28 | #include "value.h" |
| 29 | #include "gdb_string.h" |
| 30 | #include "gdb_assert.h" |
| 31 | #include "ppc-tdep.h" |
| 32 | #include "target.h" |
| 33 | #include "objfiles.h" |
| 34 | #include "infcall.h" |
| 35 | |
| 36 | /* Pass the arguments in either registers, or in the stack. Using the |
| 37 | ppc sysv ABI, the first eight words of the argument list (that might |
| 38 | be less than eight parameters if some parameters occupy more than one |
| 39 | word) are passed in r3..r10 registers. float and double parameters are |
| 40 | passed in fpr's, in addition to that. Rest of the parameters if any |
| 41 | are passed in user stack. |
| 42 | |
| 43 | If the function is returning a structure, then the return address is passed |
| 44 | in r3, then the first 7 words of the parametes can be passed in registers, |
| 45 | starting from r4. */ |
| 46 | |
| 47 | CORE_ADDR |
| 48 | ppc_sysv_abi_push_dummy_call (struct gdbarch *gdbarch, struct value *function, |
| 49 | struct regcache *regcache, CORE_ADDR bp_addr, |
| 50 | int nargs, struct value **args, CORE_ADDR sp, |
| 51 | int struct_return, CORE_ADDR struct_addr) |
| 52 | { |
| 53 | struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); |
| 54 | const CORE_ADDR saved_sp = read_sp (); |
| 55 | int argspace = 0; /* 0 is an initial wrong guess. */ |
| 56 | int write_pass; |
| 57 | |
| 58 | /* Go through the argument list twice. |
| 59 | |
| 60 | Pass 1: Figure out how much new stack space is required for |
| 61 | arguments and pushed values. Unlike the PowerOpen ABI, the SysV |
| 62 | ABI doesn't reserve any extra space for parameters which are put |
| 63 | in registers, but does always push structures and then pass their |
| 64 | address. |
| 65 | |
| 66 | Pass 2: Replay the same computation but this time also write the |
| 67 | values out to the target. */ |
| 68 | |
| 69 | for (write_pass = 0; write_pass < 2; write_pass++) |
| 70 | { |
| 71 | int argno; |
| 72 | /* Next available floating point register for float and double |
| 73 | arguments. */ |
| 74 | int freg = 1; |
| 75 | /* Next available general register for non-float, non-vector |
| 76 | arguments. */ |
| 77 | int greg = 3; |
| 78 | /* Next available vector register for vector arguments. */ |
| 79 | int vreg = 2; |
| 80 | /* Arguments start above the "LR save word" and "Back chain". */ |
| 81 | int argoffset = 2 * tdep->wordsize; |
| 82 | /* Structures start after the arguments. */ |
| 83 | int structoffset = argoffset + argspace; |
| 84 | |
| 85 | /* If the function is returning a `struct', then the first word |
| 86 | (which will be passed in r3) is used for struct return |
| 87 | address. In that case we should advance one word and start |
| 88 | from r4 register to copy parameters. */ |
| 89 | if (struct_return) |
| 90 | { |
| 91 | if (write_pass) |
| 92 | regcache_cooked_write_signed (regcache, |
| 93 | tdep->ppc_gp0_regnum + greg, |
| 94 | struct_addr); |
| 95 | greg++; |
| 96 | } |
| 97 | |
| 98 | for (argno = 0; argno < nargs; argno++) |
| 99 | { |
| 100 | struct value *arg = args[argno]; |
| 101 | struct type *type = check_typedef (value_type (arg)); |
| 102 | int len = TYPE_LENGTH (type); |
| 103 | const bfd_byte *val = value_contents (arg); |
| 104 | |
| 105 | if (TYPE_CODE (type) == TYPE_CODE_FLT |
| 106 | && ppc_floating_point_unit_p (current_gdbarch) && len <= 8) |
| 107 | { |
| 108 | /* Floating point value converted to "double" then |
| 109 | passed in an FP register, when the registers run out, |
| 110 | 8 byte aligned stack is used. */ |
| 111 | if (freg <= 8) |
| 112 | { |
| 113 | if (write_pass) |
| 114 | { |
| 115 | /* Always store the floating point value using |
| 116 | the register's floating-point format. */ |
| 117 | gdb_byte regval[MAX_REGISTER_SIZE]; |
| 118 | struct type *regtype |
| 119 | = register_type (gdbarch, tdep->ppc_fp0_regnum + freg); |
| 120 | convert_typed_floating (val, type, regval, regtype); |
| 121 | regcache_cooked_write (regcache, |
| 122 | tdep->ppc_fp0_regnum + freg, |
| 123 | regval); |
| 124 | } |
| 125 | freg++; |
| 126 | } |
| 127 | else |
| 128 | { |
| 129 | /* SysV ABI converts floats to doubles before |
| 130 | writing them to an 8 byte aligned stack location. */ |
| 131 | argoffset = align_up (argoffset, 8); |
| 132 | if (write_pass) |
| 133 | { |
| 134 | char memval[8]; |
| 135 | struct type *memtype; |
| 136 | switch (TARGET_BYTE_ORDER) |
| 137 | { |
| 138 | case BFD_ENDIAN_BIG: |
| 139 | memtype = builtin_type_ieee_double_big; |
| 140 | break; |
| 141 | case BFD_ENDIAN_LITTLE: |
| 142 | memtype = builtin_type_ieee_double_little; |
| 143 | break; |
| 144 | default: |
| 145 | internal_error (__FILE__, __LINE__, _("bad switch")); |
| 146 | } |
| 147 | convert_typed_floating (val, type, memval, memtype); |
| 148 | write_memory (sp + argoffset, val, len); |
| 149 | } |
| 150 | argoffset += 8; |
| 151 | } |
| 152 | } |
| 153 | else if (len == 8 && (TYPE_CODE (type) == TYPE_CODE_INT /* long long */ |
| 154 | || (!ppc_floating_point_unit_p (current_gdbarch) && TYPE_CODE (type) == TYPE_CODE_FLT))) /* double */ |
| 155 | { |
| 156 | /* "long long" or "double" passed in an odd/even |
| 157 | register pair with the low addressed word in the odd |
| 158 | register and the high addressed word in the even |
| 159 | register, or when the registers run out an 8 byte |
| 160 | aligned stack location. */ |
| 161 | if (greg > 9) |
| 162 | { |
| 163 | /* Just in case GREG was 10. */ |
| 164 | greg = 11; |
| 165 | argoffset = align_up (argoffset, 8); |
| 166 | if (write_pass) |
| 167 | write_memory (sp + argoffset, val, len); |
| 168 | argoffset += 8; |
| 169 | } |
| 170 | else if (tdep->wordsize == 8) |
| 171 | { |
| 172 | if (write_pass) |
| 173 | regcache_cooked_write (regcache, |
| 174 | tdep->ppc_gp0_regnum + greg, val); |
| 175 | greg += 1; |
| 176 | } |
| 177 | else |
| 178 | { |
| 179 | /* Must start on an odd register - r3/r4 etc. */ |
| 180 | if ((greg & 1) == 0) |
| 181 | greg++; |
| 182 | if (write_pass) |
| 183 | { |
| 184 | regcache_cooked_write (regcache, |
| 185 | tdep->ppc_gp0_regnum + greg + 0, |
| 186 | val + 0); |
| 187 | regcache_cooked_write (regcache, |
| 188 | tdep->ppc_gp0_regnum + greg + 1, |
| 189 | val + 4); |
| 190 | } |
| 191 | greg += 2; |
| 192 | } |
| 193 | } |
| 194 | else if (len == 16 |
| 195 | && TYPE_CODE (type) == TYPE_CODE_ARRAY |
| 196 | && TYPE_VECTOR (type) && tdep->ppc_vr0_regnum >= 0) |
| 197 | { |
| 198 | /* Vector parameter passed in an Altivec register, or |
| 199 | when that runs out, 16 byte aligned stack location. */ |
| 200 | if (vreg <= 13) |
| 201 | { |
| 202 | if (write_pass) |
| 203 | regcache_cooked_write (current_regcache, |
| 204 | tdep->ppc_vr0_regnum + vreg, val); |
| 205 | vreg++; |
| 206 | } |
| 207 | else |
| 208 | { |
| 209 | argoffset = align_up (argoffset, 16); |
| 210 | if (write_pass) |
| 211 | write_memory (sp + argoffset, val, 16); |
| 212 | argoffset += 16; |
| 213 | } |
| 214 | } |
| 215 | else if (len == 8 |
| 216 | && TYPE_CODE (type) == TYPE_CODE_ARRAY |
| 217 | && TYPE_VECTOR (type) && tdep->ppc_ev0_regnum >= 0) |
| 218 | { |
| 219 | /* Vector parameter passed in an e500 register, or when |
| 220 | that runs out, 8 byte aligned stack location. Note |
| 221 | that since e500 vector and general purpose registers |
| 222 | both map onto the same underlying register set, a |
| 223 | "greg" and not a "vreg" is consumed here. A cooked |
| 224 | write stores the value in the correct locations |
| 225 | within the raw register cache. */ |
| 226 | if (greg <= 10) |
| 227 | { |
| 228 | if (write_pass) |
| 229 | regcache_cooked_write (current_regcache, |
| 230 | tdep->ppc_ev0_regnum + greg, val); |
| 231 | greg++; |
| 232 | } |
| 233 | else |
| 234 | { |
| 235 | argoffset = align_up (argoffset, 8); |
| 236 | if (write_pass) |
| 237 | write_memory (sp + argoffset, val, 8); |
| 238 | argoffset += 8; |
| 239 | } |
| 240 | } |
| 241 | else |
| 242 | { |
| 243 | /* Reduce the parameter down to something that fits in a |
| 244 | "word". */ |
| 245 | gdb_byte word[MAX_REGISTER_SIZE]; |
| 246 | memset (word, 0, MAX_REGISTER_SIZE); |
| 247 | if (len > tdep->wordsize |
| 248 | || TYPE_CODE (type) == TYPE_CODE_STRUCT |
| 249 | || TYPE_CODE (type) == TYPE_CODE_UNION) |
| 250 | { |
| 251 | /* Structs and large values are put on an 8 byte |
| 252 | aligned stack ... */ |
| 253 | structoffset = align_up (structoffset, 8); |
| 254 | if (write_pass) |
| 255 | write_memory (sp + structoffset, val, len); |
| 256 | /* ... and then a "word" pointing to that address is |
| 257 | passed as the parameter. */ |
| 258 | store_unsigned_integer (word, tdep->wordsize, |
| 259 | sp + structoffset); |
| 260 | structoffset += len; |
| 261 | } |
| 262 | else if (TYPE_CODE (type) == TYPE_CODE_INT) |
| 263 | /* Sign or zero extend the "int" into a "word". */ |
| 264 | store_unsigned_integer (word, tdep->wordsize, |
| 265 | unpack_long (type, val)); |
| 266 | else |
| 267 | /* Always goes in the low address. */ |
| 268 | memcpy (word, val, len); |
| 269 | /* Store that "word" in a register, or on the stack. |
| 270 | The words have "4" byte alignment. */ |
| 271 | if (greg <= 10) |
| 272 | { |
| 273 | if (write_pass) |
| 274 | regcache_cooked_write (regcache, |
| 275 | tdep->ppc_gp0_regnum + greg, word); |
| 276 | greg++; |
| 277 | } |
| 278 | else |
| 279 | { |
| 280 | argoffset = align_up (argoffset, tdep->wordsize); |
| 281 | if (write_pass) |
| 282 | write_memory (sp + argoffset, word, tdep->wordsize); |
| 283 | argoffset += tdep->wordsize; |
| 284 | } |
| 285 | } |
| 286 | } |
| 287 | |
| 288 | /* Compute the actual stack space requirements. */ |
| 289 | if (!write_pass) |
| 290 | { |
| 291 | /* Remember the amount of space needed by the arguments. */ |
| 292 | argspace = argoffset; |
| 293 | /* Allocate space for both the arguments and the structures. */ |
| 294 | sp -= (argoffset + structoffset); |
| 295 | /* Ensure that the stack is still 16 byte aligned. */ |
| 296 | sp = align_down (sp, 16); |
| 297 | } |
| 298 | |
| 299 | /* The psABI says that "A caller of a function that takes a |
| 300 | variable argument list shall set condition register bit 6 to |
| 301 | 1 if it passes one or more arguments in the floating-point |
| 302 | registers. It is strongly recommended that the caller set the |
| 303 | bit to 0 otherwise..." Doing this for normal functions too |
| 304 | shouldn't hurt. */ |
| 305 | if (write_pass) |
| 306 | { |
| 307 | ULONGEST cr; |
| 308 | |
| 309 | regcache_cooked_read_unsigned (regcache, tdep->ppc_cr_regnum, &cr); |
| 310 | if (freg > 1) |
| 311 | cr |= 0x02000000; |
| 312 | else |
| 313 | cr &= ~0x02000000; |
| 314 | regcache_cooked_write_unsigned (regcache, tdep->ppc_cr_regnum, cr); |
| 315 | } |
| 316 | } |
| 317 | |
| 318 | /* Update %sp. */ |
| 319 | regcache_cooked_write_signed (regcache, SP_REGNUM, sp); |
| 320 | |
| 321 | /* Write the backchain (it occupies WORDSIZED bytes). */ |
| 322 | write_memory_signed_integer (sp, tdep->wordsize, saved_sp); |
| 323 | |
| 324 | /* Point the inferior function call's return address at the dummy's |
| 325 | breakpoint. */ |
| 326 | regcache_cooked_write_signed (regcache, tdep->ppc_lr_regnum, bp_addr); |
| 327 | |
| 328 | return sp; |
| 329 | } |
| 330 | |
| 331 | /* Handle the return-value conventions specified by the SysV 32-bit |
| 332 | PowerPC ABI (including all the supplements): |
| 333 | |
| 334 | no floating-point: floating-point values returned using 32-bit |
| 335 | general-purpose registers. |
| 336 | |
| 337 | Altivec: 128-bit vectors returned using vector registers. |
| 338 | |
| 339 | e500: 64-bit vectors returned using the full full 64 bit EV |
| 340 | register, floating-point values returned using 32-bit |
| 341 | general-purpose registers. |
| 342 | |
| 343 | GCC (broken): Small struct values right (instead of left) aligned |
| 344 | when returned in general-purpose registers. */ |
| 345 | |
| 346 | static enum return_value_convention |
| 347 | do_ppc_sysv_return_value (struct gdbarch *gdbarch, struct type *type, |
| 348 | struct regcache *regcache, void *readbuf, |
| 349 | const void *writebuf, int broken_gcc) |
| 350 | { |
| 351 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 352 | gdb_assert (tdep->wordsize == 4); |
| 353 | if (TYPE_CODE (type) == TYPE_CODE_FLT |
| 354 | && TYPE_LENGTH (type) <= 8 |
| 355 | && ppc_floating_point_unit_p (gdbarch)) |
| 356 | { |
| 357 | if (readbuf) |
| 358 | { |
| 359 | /* Floats and doubles stored in "f1". Convert the value to |
| 360 | the required type. */ |
| 361 | gdb_byte regval[MAX_REGISTER_SIZE]; |
| 362 | struct type *regtype = register_type (gdbarch, |
| 363 | tdep->ppc_fp0_regnum + 1); |
| 364 | regcache_cooked_read (regcache, tdep->ppc_fp0_regnum + 1, regval); |
| 365 | convert_typed_floating (regval, regtype, readbuf, type); |
| 366 | } |
| 367 | if (writebuf) |
| 368 | { |
| 369 | /* Floats and doubles stored in "f1". Convert the value to |
| 370 | the register's "double" type. */ |
| 371 | gdb_byte regval[MAX_REGISTER_SIZE]; |
| 372 | struct type *regtype = register_type (gdbarch, tdep->ppc_fp0_regnum); |
| 373 | convert_typed_floating (writebuf, type, regval, regtype); |
| 374 | regcache_cooked_write (regcache, tdep->ppc_fp0_regnum + 1, regval); |
| 375 | } |
| 376 | return RETURN_VALUE_REGISTER_CONVENTION; |
| 377 | } |
| 378 | if ((TYPE_CODE (type) == TYPE_CODE_INT && TYPE_LENGTH (type) == 8) |
| 379 | || (TYPE_CODE (type) == TYPE_CODE_FLT && TYPE_LENGTH (type) == 8)) |
| 380 | { |
| 381 | if (readbuf) |
| 382 | { |
| 383 | /* A long long, or a double stored in the 32 bit r3/r4. */ |
| 384 | regcache_cooked_read (regcache, tdep->ppc_gp0_regnum + 3, |
| 385 | (bfd_byte *) readbuf + 0); |
| 386 | regcache_cooked_read (regcache, tdep->ppc_gp0_regnum + 4, |
| 387 | (bfd_byte *) readbuf + 4); |
| 388 | } |
| 389 | if (writebuf) |
| 390 | { |
| 391 | /* A long long, or a double stored in the 32 bit r3/r4. */ |
| 392 | regcache_cooked_write (regcache, tdep->ppc_gp0_regnum + 3, |
| 393 | (const bfd_byte *) writebuf + 0); |
| 394 | regcache_cooked_write (regcache, tdep->ppc_gp0_regnum + 4, |
| 395 | (const bfd_byte *) writebuf + 4); |
| 396 | } |
| 397 | return RETURN_VALUE_REGISTER_CONVENTION; |
| 398 | } |
| 399 | if (TYPE_CODE (type) == TYPE_CODE_INT |
| 400 | && TYPE_LENGTH (type) <= tdep->wordsize) |
| 401 | { |
| 402 | if (readbuf) |
| 403 | { |
| 404 | /* Some sort of integer stored in r3. Since TYPE isn't |
| 405 | bigger than the register, sign extension isn't a problem |
| 406 | - just do everything unsigned. */ |
| 407 | ULONGEST regval; |
| 408 | regcache_cooked_read_unsigned (regcache, tdep->ppc_gp0_regnum + 3, |
| 409 | ®val); |
| 410 | store_unsigned_integer (readbuf, TYPE_LENGTH (type), regval); |
| 411 | } |
| 412 | if (writebuf) |
| 413 | { |
| 414 | /* Some sort of integer stored in r3. Use unpack_long since |
| 415 | that should handle any required sign extension. */ |
| 416 | regcache_cooked_write_unsigned (regcache, tdep->ppc_gp0_regnum + 3, |
| 417 | unpack_long (type, writebuf)); |
| 418 | } |
| 419 | return RETURN_VALUE_REGISTER_CONVENTION; |
| 420 | } |
| 421 | if (TYPE_LENGTH (type) == 16 |
| 422 | && TYPE_CODE (type) == TYPE_CODE_ARRAY |
| 423 | && TYPE_VECTOR (type) && tdep->ppc_vr0_regnum >= 0) |
| 424 | { |
| 425 | if (readbuf) |
| 426 | { |
| 427 | /* Altivec places the return value in "v2". */ |
| 428 | regcache_cooked_read (regcache, tdep->ppc_vr0_regnum + 2, readbuf); |
| 429 | } |
| 430 | if (writebuf) |
| 431 | { |
| 432 | /* Altivec places the return value in "v2". */ |
| 433 | regcache_cooked_write (regcache, tdep->ppc_vr0_regnum + 2, writebuf); |
| 434 | } |
| 435 | return RETURN_VALUE_REGISTER_CONVENTION; |
| 436 | } |
| 437 | if (TYPE_LENGTH (type) == 8 |
| 438 | && TYPE_CODE (type) == TYPE_CODE_ARRAY |
| 439 | && TYPE_VECTOR (type) && tdep->ppc_ev0_regnum >= 0) |
| 440 | { |
| 441 | /* The e500 ABI places return values for the 64-bit DSP types |
| 442 | (__ev64_opaque__) in r3. However, in GDB-speak, ev3 |
| 443 | corresponds to the entire r3 value for e500, whereas GDB's r3 |
| 444 | only corresponds to the least significant 32-bits. So place |
| 445 | the 64-bit DSP type's value in ev3. */ |
| 446 | if (readbuf) |
| 447 | regcache_cooked_read (regcache, tdep->ppc_ev0_regnum + 3, readbuf); |
| 448 | if (writebuf) |
| 449 | regcache_cooked_write (regcache, tdep->ppc_ev0_regnum + 3, writebuf); |
| 450 | return RETURN_VALUE_REGISTER_CONVENTION; |
| 451 | } |
| 452 | if (broken_gcc && TYPE_LENGTH (type) <= 8) |
| 453 | { |
| 454 | /* GCC screwed up for structures or unions whose size is less |
| 455 | than or equal to 8 bytes.. Instead of left-aligning, it |
| 456 | right-aligns the data into the buffer formed by r3, r4. */ |
| 457 | gdb_byte regvals[MAX_REGISTER_SIZE * 2]; |
| 458 | int len = TYPE_LENGTH (type); |
| 459 | int offset = (2 * tdep->wordsize - len) % tdep->wordsize; |
| 460 | |
| 461 | if (readbuf) |
| 462 | { |
| 463 | regcache_cooked_read (regcache, tdep->ppc_gp0_regnum + 3, |
| 464 | regvals + 0 * tdep->wordsize); |
| 465 | if (len > tdep->wordsize) |
| 466 | regcache_cooked_read (regcache, tdep->ppc_gp0_regnum + 4, |
| 467 | regvals + 1 * tdep->wordsize); |
| 468 | memcpy (readbuf, regvals + offset, len); |
| 469 | } |
| 470 | if (writebuf) |
| 471 | { |
| 472 | memset (regvals, 0, sizeof regvals); |
| 473 | memcpy (regvals + offset, writebuf, len); |
| 474 | regcache_cooked_write (regcache, tdep->ppc_gp0_regnum + 3, |
| 475 | regvals + 0 * tdep->wordsize); |
| 476 | if (len > tdep->wordsize) |
| 477 | regcache_cooked_write (regcache, tdep->ppc_gp0_regnum + 4, |
| 478 | regvals + 1 * tdep->wordsize); |
| 479 | } |
| 480 | |
| 481 | return RETURN_VALUE_REGISTER_CONVENTION; |
| 482 | } |
| 483 | if (TYPE_LENGTH (type) <= 8) |
| 484 | { |
| 485 | if (readbuf) |
| 486 | { |
| 487 | /* This matches SVr4 PPC, it does not match GCC. */ |
| 488 | /* The value is right-padded to 8 bytes and then loaded, as |
| 489 | two "words", into r3/r4. */ |
| 490 | gdb_byte regvals[MAX_REGISTER_SIZE * 2]; |
| 491 | regcache_cooked_read (regcache, tdep->ppc_gp0_regnum + 3, |
| 492 | regvals + 0 * tdep->wordsize); |
| 493 | if (TYPE_LENGTH (type) > tdep->wordsize) |
| 494 | regcache_cooked_read (regcache, tdep->ppc_gp0_regnum + 4, |
| 495 | regvals + 1 * tdep->wordsize); |
| 496 | memcpy (readbuf, regvals, TYPE_LENGTH (type)); |
| 497 | } |
| 498 | if (writebuf) |
| 499 | { |
| 500 | /* This matches SVr4 PPC, it does not match GCC. */ |
| 501 | /* The value is padded out to 8 bytes and then loaded, as |
| 502 | two "words" into r3/r4. */ |
| 503 | gdb_byte regvals[MAX_REGISTER_SIZE * 2]; |
| 504 | memset (regvals, 0, sizeof regvals); |
| 505 | memcpy (regvals, writebuf, TYPE_LENGTH (type)); |
| 506 | regcache_cooked_write (regcache, tdep->ppc_gp0_regnum + 3, |
| 507 | regvals + 0 * tdep->wordsize); |
| 508 | if (TYPE_LENGTH (type) > tdep->wordsize) |
| 509 | regcache_cooked_write (regcache, tdep->ppc_gp0_regnum + 4, |
| 510 | regvals + 1 * tdep->wordsize); |
| 511 | } |
| 512 | return RETURN_VALUE_REGISTER_CONVENTION; |
| 513 | } |
| 514 | return RETURN_VALUE_STRUCT_CONVENTION; |
| 515 | } |
| 516 | |
| 517 | enum return_value_convention |
| 518 | ppc_sysv_abi_return_value (struct gdbarch *gdbarch, struct type *valtype, |
| 519 | struct regcache *regcache, gdb_byte *readbuf, |
| 520 | const gdb_byte *writebuf) |
| 521 | { |
| 522 | return do_ppc_sysv_return_value (gdbarch, valtype, regcache, readbuf, |
| 523 | writebuf, 0); |
| 524 | } |
| 525 | |
| 526 | enum return_value_convention |
| 527 | ppc_sysv_abi_broken_return_value (struct gdbarch *gdbarch, |
| 528 | struct type *valtype, |
| 529 | struct regcache *regcache, |
| 530 | gdb_byte *readbuf, const gdb_byte *writebuf) |
| 531 | { |
| 532 | return do_ppc_sysv_return_value (gdbarch, valtype, regcache, readbuf, |
| 533 | writebuf, 1); |
| 534 | } |
| 535 | |
| 536 | /* The helper function for 64-bit SYSV push_dummy_call. Converts the |
| 537 | function's code address back into the function's descriptor |
| 538 | address. |
| 539 | |
| 540 | Find a value for the TOC register. Every symbol should have both |
| 541 | ".FN" and "FN" in the minimal symbol table. "FN" points at the |
| 542 | FN's descriptor, while ".FN" points at the entry point (which |
| 543 | matches FUNC_ADDR). Need to reverse from FUNC_ADDR back to the |
| 544 | FN's descriptor address (while at the same time being careful to |
| 545 | find "FN" in the same object file as ".FN"). */ |
| 546 | |
| 547 | static int |
| 548 | convert_code_addr_to_desc_addr (CORE_ADDR code_addr, CORE_ADDR *desc_addr) |
| 549 | { |
| 550 | struct obj_section *dot_fn_section; |
| 551 | struct minimal_symbol *dot_fn; |
| 552 | struct minimal_symbol *fn; |
| 553 | CORE_ADDR toc; |
| 554 | /* Find the minimal symbol that corresponds to CODE_ADDR (should |
| 555 | have a name of the form ".FN"). */ |
| 556 | dot_fn = lookup_minimal_symbol_by_pc (code_addr); |
| 557 | if (dot_fn == NULL || SYMBOL_LINKAGE_NAME (dot_fn)[0] != '.') |
| 558 | return 0; |
| 559 | /* Get the section that contains CODE_ADDR. Need this for the |
| 560 | "objfile" that it contains. */ |
| 561 | dot_fn_section = find_pc_section (code_addr); |
| 562 | if (dot_fn_section == NULL || dot_fn_section->objfile == NULL) |
| 563 | return 0; |
| 564 | /* Now find the corresponding "FN" (dropping ".") minimal symbol's |
| 565 | address. Only look for the minimal symbol in ".FN"'s object file |
| 566 | - avoids problems when two object files (i.e., shared libraries) |
| 567 | contain a minimal symbol with the same name. */ |
| 568 | fn = lookup_minimal_symbol (SYMBOL_LINKAGE_NAME (dot_fn) + 1, NULL, |
| 569 | dot_fn_section->objfile); |
| 570 | if (fn == NULL) |
| 571 | return 0; |
| 572 | /* Found a descriptor. */ |
| 573 | (*desc_addr) = SYMBOL_VALUE_ADDRESS (fn); |
| 574 | return 1; |
| 575 | } |
| 576 | |
| 577 | /* Pass the arguments in either registers, or in the stack. Using the |
| 578 | ppc 64 bit SysV ABI. |
| 579 | |
| 580 | This implements a dumbed down version of the ABI. It always writes |
| 581 | values to memory, GPR and FPR, even when not necessary. Doing this |
| 582 | greatly simplifies the logic. */ |
| 583 | |
| 584 | CORE_ADDR |
| 585 | ppc64_sysv_abi_push_dummy_call (struct gdbarch *gdbarch, struct value *function, |
| 586 | struct regcache *regcache, CORE_ADDR bp_addr, |
| 587 | int nargs, struct value **args, CORE_ADDR sp, |
| 588 | int struct_return, CORE_ADDR struct_addr) |
| 589 | { |
| 590 | CORE_ADDR func_addr = find_function_addr (function, NULL); |
| 591 | struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); |
| 592 | /* By this stage in the proceedings, SP has been decremented by "red |
| 593 | zone size" + "struct return size". Fetch the stack-pointer from |
| 594 | before this and use that as the BACK_CHAIN. */ |
| 595 | const CORE_ADDR back_chain = read_sp (); |
| 596 | /* See for-loop comment below. */ |
| 597 | int write_pass; |
| 598 | /* Size of the Altivec's vector parameter region, the final value is |
| 599 | computed in the for-loop below. */ |
| 600 | LONGEST vparam_size = 0; |
| 601 | /* Size of the general parameter region, the final value is computed |
| 602 | in the for-loop below. */ |
| 603 | LONGEST gparam_size = 0; |
| 604 | /* Kevin writes ... I don't mind seeing tdep->wordsize used in the |
| 605 | calls to align_up(), align_down(), etc. because this makes it |
| 606 | easier to reuse this code (in a copy/paste sense) in the future, |
| 607 | but it is a 64-bit ABI and asserting that the wordsize is 8 bytes |
| 608 | at some point makes it easier to verify that this function is |
| 609 | correct without having to do a non-local analysis to figure out |
| 610 | the possible values of tdep->wordsize. */ |
| 611 | gdb_assert (tdep->wordsize == 8); |
| 612 | |
| 613 | /* Go through the argument list twice. |
| 614 | |
| 615 | Pass 1: Compute the function call's stack space and register |
| 616 | requirements. |
| 617 | |
| 618 | Pass 2: Replay the same computation but this time also write the |
| 619 | values out to the target. */ |
| 620 | |
| 621 | for (write_pass = 0; write_pass < 2; write_pass++) |
| 622 | { |
| 623 | int argno; |
| 624 | /* Next available floating point register for float and double |
| 625 | arguments. */ |
| 626 | int freg = 1; |
| 627 | /* Next available general register for non-vector (but possibly |
| 628 | float) arguments. */ |
| 629 | int greg = 3; |
| 630 | /* Next available vector register for vector arguments. */ |
| 631 | int vreg = 2; |
| 632 | /* The address, at which the next general purpose parameter |
| 633 | (integer, struct, float, ...) should be saved. */ |
| 634 | CORE_ADDR gparam; |
| 635 | /* Address, at which the next Altivec vector parameter should be |
| 636 | saved. */ |
| 637 | CORE_ADDR vparam; |
| 638 | |
| 639 | if (!write_pass) |
| 640 | { |
| 641 | /* During the first pass, GPARAM and VPARAM are more like |
| 642 | offsets (start address zero) than addresses. That way |
| 643 | the accumulate the total stack space each region |
| 644 | requires. */ |
| 645 | gparam = 0; |
| 646 | vparam = 0; |
| 647 | } |
| 648 | else |
| 649 | { |
| 650 | /* Decrement the stack pointer making space for the Altivec |
| 651 | and general on-stack parameters. Set vparam and gparam |
| 652 | to their corresponding regions. */ |
| 653 | vparam = align_down (sp - vparam_size, 16); |
| 654 | gparam = align_down (vparam - gparam_size, 16); |
| 655 | /* Add in space for the TOC, link editor double word, |
| 656 | compiler double word, LR save area, CR save area. */ |
| 657 | sp = align_down (gparam - 48, 16); |
| 658 | } |
| 659 | |
| 660 | /* If the function is returning a `struct', then there is an |
| 661 | extra hidden parameter (which will be passed in r3) |
| 662 | containing the address of that struct.. In that case we |
| 663 | should advance one word and start from r4 register to copy |
| 664 | parameters. This also consumes one on-stack parameter slot. */ |
| 665 | if (struct_return) |
| 666 | { |
| 667 | if (write_pass) |
| 668 | regcache_cooked_write_signed (regcache, |
| 669 | tdep->ppc_gp0_regnum + greg, |
| 670 | struct_addr); |
| 671 | greg++; |
| 672 | gparam = align_up (gparam + tdep->wordsize, tdep->wordsize); |
| 673 | } |
| 674 | |
| 675 | for (argno = 0; argno < nargs; argno++) |
| 676 | { |
| 677 | struct value *arg = args[argno]; |
| 678 | struct type *type = check_typedef (value_type (arg)); |
| 679 | const bfd_byte *val = value_contents (arg); |
| 680 | if (TYPE_CODE (type) == TYPE_CODE_FLT && TYPE_LENGTH (type) <= 8) |
| 681 | { |
| 682 | /* Floats and Doubles go in f1 .. f13. They also |
| 683 | consume a left aligned GREG,, and can end up in |
| 684 | memory. */ |
| 685 | if (write_pass) |
| 686 | { |
| 687 | if (ppc_floating_point_unit_p (current_gdbarch) |
| 688 | && freg <= 13) |
| 689 | { |
| 690 | gdb_byte regval[MAX_REGISTER_SIZE]; |
| 691 | struct type *regtype |
| 692 | = register_type (gdbarch, tdep->ppc_fp0_regnum); |
| 693 | convert_typed_floating (val, type, regval, regtype); |
| 694 | regcache_cooked_write (regcache, |
| 695 | tdep->ppc_fp0_regnum + freg, |
| 696 | regval); |
| 697 | } |
| 698 | if (greg <= 10) |
| 699 | { |
| 700 | /* The ABI states "Single precision floating |
| 701 | point values are mapped to the first word in |
| 702 | a single doubleword" and "... floating point |
| 703 | values mapped to the first eight doublewords |
| 704 | of the parameter save area are also passed in |
| 705 | general registers"). |
| 706 | |
| 707 | This code interprets that to mean: store it, |
| 708 | left aligned, in the general register. */ |
| 709 | gdb_byte regval[MAX_REGISTER_SIZE]; |
| 710 | memset (regval, 0, sizeof regval); |
| 711 | memcpy (regval, val, TYPE_LENGTH (type)); |
| 712 | regcache_cooked_write (regcache, |
| 713 | tdep->ppc_gp0_regnum + greg, |
| 714 | regval); |
| 715 | } |
| 716 | write_memory (gparam, val, TYPE_LENGTH (type)); |
| 717 | } |
| 718 | /* Always consume parameter stack space. */ |
| 719 | freg++; |
| 720 | greg++; |
| 721 | gparam = align_up (gparam + TYPE_LENGTH (type), tdep->wordsize); |
| 722 | } |
| 723 | else if (TYPE_LENGTH (type) == 16 && TYPE_VECTOR (type) |
| 724 | && TYPE_CODE (type) == TYPE_CODE_ARRAY |
| 725 | && tdep->ppc_vr0_regnum >= 0) |
| 726 | { |
| 727 | /* In the Altivec ABI, vectors go in the vector |
| 728 | registers v2 .. v13, or when that runs out, a vector |
| 729 | annex which goes above all the normal parameters. |
| 730 | NOTE: cagney/2003-09-21: This is a guess based on the |
| 731 | PowerOpen Altivec ABI. */ |
| 732 | if (vreg <= 13) |
| 733 | { |
| 734 | if (write_pass) |
| 735 | regcache_cooked_write (regcache, |
| 736 | tdep->ppc_vr0_regnum + vreg, val); |
| 737 | vreg++; |
| 738 | } |
| 739 | else |
| 740 | { |
| 741 | if (write_pass) |
| 742 | write_memory (vparam, val, TYPE_LENGTH (type)); |
| 743 | vparam = align_up (vparam + TYPE_LENGTH (type), 16); |
| 744 | } |
| 745 | } |
| 746 | else if ((TYPE_CODE (type) == TYPE_CODE_INT |
| 747 | || TYPE_CODE (type) == TYPE_CODE_ENUM |
| 748 | || TYPE_CODE (type) == TYPE_CODE_PTR) |
| 749 | && TYPE_LENGTH (type) <= 8) |
| 750 | { |
| 751 | /* Scalars and Pointers get sign[un]extended and go in |
| 752 | gpr3 .. gpr10. They can also end up in memory. */ |
| 753 | if (write_pass) |
| 754 | { |
| 755 | /* Sign extend the value, then store it unsigned. */ |
| 756 | ULONGEST word = unpack_long (type, val); |
| 757 | /* Convert any function code addresses into |
| 758 | descriptors. */ |
| 759 | if (TYPE_CODE (type) == TYPE_CODE_PTR |
| 760 | && TYPE_CODE (TYPE_TARGET_TYPE (type)) == TYPE_CODE_FUNC) |
| 761 | { |
| 762 | CORE_ADDR desc = word; |
| 763 | convert_code_addr_to_desc_addr (word, &desc); |
| 764 | word = desc; |
| 765 | } |
| 766 | if (greg <= 10) |
| 767 | regcache_cooked_write_unsigned (regcache, |
| 768 | tdep->ppc_gp0_regnum + |
| 769 | greg, word); |
| 770 | write_memory_unsigned_integer (gparam, tdep->wordsize, |
| 771 | word); |
| 772 | } |
| 773 | greg++; |
| 774 | gparam = align_up (gparam + TYPE_LENGTH (type), tdep->wordsize); |
| 775 | } |
| 776 | else |
| 777 | { |
| 778 | int byte; |
| 779 | for (byte = 0; byte < TYPE_LENGTH (type); |
| 780 | byte += tdep->wordsize) |
| 781 | { |
| 782 | if (write_pass && greg <= 10) |
| 783 | { |
| 784 | gdb_byte regval[MAX_REGISTER_SIZE]; |
| 785 | int len = TYPE_LENGTH (type) - byte; |
| 786 | if (len > tdep->wordsize) |
| 787 | len = tdep->wordsize; |
| 788 | memset (regval, 0, sizeof regval); |
| 789 | /* WARNING: cagney/2003-09-21: As best I can |
| 790 | tell, the ABI specifies that the value should |
| 791 | be left aligned. Unfortunately, GCC doesn't |
| 792 | do this - it instead right aligns even sized |
| 793 | values and puts odd sized values on the |
| 794 | stack. Work around that by putting both a |
| 795 | left and right aligned value into the |
| 796 | register (hopefully no one notices :-^). |
| 797 | Arrrgh! */ |
| 798 | /* Left aligned (8 byte values such as pointers |
| 799 | fill the buffer). */ |
| 800 | memcpy (regval, val + byte, len); |
| 801 | /* Right aligned (but only if even). */ |
| 802 | if (len == 1 || len == 2 || len == 4) |
| 803 | memcpy (regval + tdep->wordsize - len, |
| 804 | val + byte, len); |
| 805 | regcache_cooked_write (regcache, greg, regval); |
| 806 | } |
| 807 | greg++; |
| 808 | } |
| 809 | if (write_pass) |
| 810 | /* WARNING: cagney/2003-09-21: Strictly speaking, this |
| 811 | isn't necessary, unfortunately, GCC appears to get |
| 812 | "struct convention" parameter passing wrong putting |
| 813 | odd sized structures in memory instead of in a |
| 814 | register. Work around this by always writing the |
| 815 | value to memory. Fortunately, doing this |
| 816 | simplifies the code. */ |
| 817 | write_memory (gparam, val, TYPE_LENGTH (type)); |
| 818 | if (write_pass) |
| 819 | /* WARNING: cagney/2004-06-20: It appears that GCC |
| 820 | likes to put structures containing a single |
| 821 | floating-point member in an FP register instead of |
| 822 | general general purpose. */ |
| 823 | /* Always consume parameter stack space. */ |
| 824 | gparam = align_up (gparam + TYPE_LENGTH (type), tdep->wordsize); |
| 825 | } |
| 826 | } |
| 827 | |
| 828 | if (!write_pass) |
| 829 | { |
| 830 | /* Save the true region sizes ready for the second pass. */ |
| 831 | vparam_size = vparam; |
| 832 | /* Make certain that the general parameter save area is at |
| 833 | least the minimum 8 registers (or doublewords) in size. */ |
| 834 | if (greg < 8) |
| 835 | gparam_size = 8 * tdep->wordsize; |
| 836 | else |
| 837 | gparam_size = gparam; |
| 838 | } |
| 839 | } |
| 840 | |
| 841 | /* Update %sp. */ |
| 842 | regcache_cooked_write_signed (regcache, SP_REGNUM, sp); |
| 843 | |
| 844 | /* Write the backchain (it occupies WORDSIZED bytes). */ |
| 845 | write_memory_signed_integer (sp, tdep->wordsize, back_chain); |
| 846 | |
| 847 | /* Point the inferior function call's return address at the dummy's |
| 848 | breakpoint. */ |
| 849 | regcache_cooked_write_signed (regcache, tdep->ppc_lr_regnum, bp_addr); |
| 850 | |
| 851 | /* Use the func_addr to find the descriptor, and use that to find |
| 852 | the TOC. */ |
| 853 | { |
| 854 | CORE_ADDR desc_addr; |
| 855 | if (convert_code_addr_to_desc_addr (func_addr, &desc_addr)) |
| 856 | { |
| 857 | /* The TOC is the second double word in the descriptor. */ |
| 858 | CORE_ADDR toc = |
| 859 | read_memory_unsigned_integer (desc_addr + tdep->wordsize, |
| 860 | tdep->wordsize); |
| 861 | regcache_cooked_write_unsigned (regcache, |
| 862 | tdep->ppc_gp0_regnum + 2, toc); |
| 863 | } |
| 864 | } |
| 865 | |
| 866 | return sp; |
| 867 | } |
| 868 | |
| 869 | |
| 870 | /* The 64 bit ABI retun value convention. |
| 871 | |
| 872 | Return non-zero if the return-value is stored in a register, return |
| 873 | 0 if the return-value is instead stored on the stack (a.k.a., |
| 874 | struct return convention). |
| 875 | |
| 876 | For a return-value stored in a register: when WRITEBUF is non-NULL, |
| 877 | copy the buffer to the corresponding register return-value location |
| 878 | location; when READBUF is non-NULL, fill the buffer from the |
| 879 | corresponding register return-value location. */ |
| 880 | enum return_value_convention |
| 881 | ppc64_sysv_abi_return_value (struct gdbarch *gdbarch, struct type *valtype, |
| 882 | struct regcache *regcache, gdb_byte *readbuf, |
| 883 | const gdb_byte *writebuf) |
| 884 | { |
| 885 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 886 | |
| 887 | /* This function exists to support a calling convention that |
| 888 | requires floating-point registers. It shouldn't be used on |
| 889 | processors that lack them. */ |
| 890 | gdb_assert (ppc_floating_point_unit_p (gdbarch)); |
| 891 | |
| 892 | /* Floats and doubles in F1. */ |
| 893 | if (TYPE_CODE (valtype) == TYPE_CODE_FLT && TYPE_LENGTH (valtype) <= 8) |
| 894 | { |
| 895 | gdb_byte regval[MAX_REGISTER_SIZE]; |
| 896 | struct type *regtype = register_type (gdbarch, tdep->ppc_fp0_regnum); |
| 897 | if (writebuf != NULL) |
| 898 | { |
| 899 | convert_typed_floating (writebuf, valtype, regval, regtype); |
| 900 | regcache_cooked_write (regcache, tdep->ppc_fp0_regnum + 1, regval); |
| 901 | } |
| 902 | if (readbuf != NULL) |
| 903 | { |
| 904 | regcache_cooked_read (regcache, tdep->ppc_fp0_regnum + 1, regval); |
| 905 | convert_typed_floating (regval, regtype, readbuf, valtype); |
| 906 | } |
| 907 | return RETURN_VALUE_REGISTER_CONVENTION; |
| 908 | } |
| 909 | /* Integers in r3. */ |
| 910 | if ((TYPE_CODE (valtype) == TYPE_CODE_INT |
| 911 | || TYPE_CODE (valtype) == TYPE_CODE_ENUM) |
| 912 | && TYPE_LENGTH (valtype) <= 8) |
| 913 | { |
| 914 | if (writebuf != NULL) |
| 915 | { |
| 916 | /* Be careful to sign extend the value. */ |
| 917 | regcache_cooked_write_unsigned (regcache, tdep->ppc_gp0_regnum + 3, |
| 918 | unpack_long (valtype, writebuf)); |
| 919 | } |
| 920 | if (readbuf != NULL) |
| 921 | { |
| 922 | /* Extract the integer from r3. Since this is truncating the |
| 923 | value, there isn't a sign extension problem. */ |
| 924 | ULONGEST regval; |
| 925 | regcache_cooked_read_unsigned (regcache, tdep->ppc_gp0_regnum + 3, |
| 926 | ®val); |
| 927 | store_unsigned_integer (readbuf, TYPE_LENGTH (valtype), regval); |
| 928 | } |
| 929 | return RETURN_VALUE_REGISTER_CONVENTION; |
| 930 | } |
| 931 | /* All pointers live in r3. */ |
| 932 | if (TYPE_CODE (valtype) == TYPE_CODE_PTR) |
| 933 | { |
| 934 | /* All pointers live in r3. */ |
| 935 | if (writebuf != NULL) |
| 936 | regcache_cooked_write (regcache, tdep->ppc_gp0_regnum + 3, writebuf); |
| 937 | if (readbuf != NULL) |
| 938 | regcache_cooked_read (regcache, tdep->ppc_gp0_regnum + 3, readbuf); |
| 939 | return RETURN_VALUE_REGISTER_CONVENTION; |
| 940 | } |
| 941 | /* Array type has more than one use. */ |
| 942 | if (TYPE_CODE (valtype) == TYPE_CODE_ARRAY) |
| 943 | { |
| 944 | /* Small character arrays are returned, right justified, in r3. */ |
| 945 | if (TYPE_LENGTH (valtype) <= 8 |
| 946 | && TYPE_CODE (TYPE_TARGET_TYPE (valtype)) == TYPE_CODE_INT |
| 947 | && TYPE_LENGTH (TYPE_TARGET_TYPE (valtype)) == 1) |
| 948 | { |
| 949 | int offset = (register_size (gdbarch, tdep->ppc_gp0_regnum + 3) |
| 950 | - TYPE_LENGTH (valtype)); |
| 951 | if (writebuf != NULL) |
| 952 | regcache_cooked_write_part (regcache, tdep->ppc_gp0_regnum + 3, |
| 953 | offset, TYPE_LENGTH (valtype), writebuf); |
| 954 | if (readbuf != NULL) |
| 955 | regcache_cooked_read_part (regcache, tdep->ppc_gp0_regnum + 3, |
| 956 | offset, TYPE_LENGTH (valtype), readbuf); |
| 957 | return RETURN_VALUE_REGISTER_CONVENTION; |
| 958 | } |
| 959 | /* A VMX vector is returned in v2. */ |
| 960 | if (TYPE_CODE (valtype) == TYPE_CODE_ARRAY |
| 961 | && TYPE_VECTOR (valtype) && tdep->ppc_vr0_regnum >= 0) |
| 962 | { |
| 963 | if (readbuf) |
| 964 | regcache_cooked_read (regcache, tdep->ppc_vr0_regnum + 2, readbuf); |
| 965 | if (writebuf) |
| 966 | regcache_cooked_write (regcache, tdep->ppc_vr0_regnum + 2, writebuf); |
| 967 | return RETURN_VALUE_REGISTER_CONVENTION; |
| 968 | } |
| 969 | } |
| 970 | /* Big floating point values get stored in adjacent floating |
| 971 | point registers, starting with F1. */ |
| 972 | if (TYPE_CODE (valtype) == TYPE_CODE_FLT |
| 973 | && (TYPE_LENGTH (valtype) == 16 || TYPE_LENGTH (valtype) == 32)) |
| 974 | { |
| 975 | if (writebuf || readbuf != NULL) |
| 976 | { |
| 977 | int i; |
| 978 | for (i = 0; i < TYPE_LENGTH (valtype) / 8; i++) |
| 979 | { |
| 980 | if (writebuf != NULL) |
| 981 | regcache_cooked_write (regcache, tdep->ppc_fp0_regnum + 1 + i, |
| 982 | (const bfd_byte *) writebuf + i * 8); |
| 983 | if (readbuf != NULL) |
| 984 | regcache_cooked_read (regcache, tdep->ppc_fp0_regnum + 1 + i, |
| 985 | (bfd_byte *) readbuf + i * 8); |
| 986 | } |
| 987 | } |
| 988 | return RETURN_VALUE_REGISTER_CONVENTION; |
| 989 | } |
| 990 | /* Complex values get returned in f1:f2, need to convert. */ |
| 991 | if (TYPE_CODE (valtype) == TYPE_CODE_COMPLEX |
| 992 | && (TYPE_LENGTH (valtype) == 8 || TYPE_LENGTH (valtype) == 16)) |
| 993 | { |
| 994 | if (regcache != NULL) |
| 995 | { |
| 996 | int i; |
| 997 | for (i = 0; i < 2; i++) |
| 998 | { |
| 999 | gdb_byte regval[MAX_REGISTER_SIZE]; |
| 1000 | struct type *regtype = |
| 1001 | register_type (current_gdbarch, tdep->ppc_fp0_regnum); |
| 1002 | if (writebuf != NULL) |
| 1003 | { |
| 1004 | convert_typed_floating ((const bfd_byte *) writebuf + |
| 1005 | i * (TYPE_LENGTH (valtype) / 2), |
| 1006 | valtype, regval, regtype); |
| 1007 | regcache_cooked_write (regcache, |
| 1008 | tdep->ppc_fp0_regnum + 1 + i, |
| 1009 | regval); |
| 1010 | } |
| 1011 | if (readbuf != NULL) |
| 1012 | { |
| 1013 | regcache_cooked_read (regcache, |
| 1014 | tdep->ppc_fp0_regnum + 1 + i, |
| 1015 | regval); |
| 1016 | convert_typed_floating (regval, regtype, |
| 1017 | (bfd_byte *) readbuf + |
| 1018 | i * (TYPE_LENGTH (valtype) / 2), |
| 1019 | valtype); |
| 1020 | } |
| 1021 | } |
| 1022 | } |
| 1023 | return RETURN_VALUE_REGISTER_CONVENTION; |
| 1024 | } |
| 1025 | /* Big complex values get stored in f1:f4. */ |
| 1026 | if (TYPE_CODE (valtype) == TYPE_CODE_COMPLEX && TYPE_LENGTH (valtype) == 32) |
| 1027 | { |
| 1028 | if (regcache != NULL) |
| 1029 | { |
| 1030 | int i; |
| 1031 | for (i = 0; i < 4; i++) |
| 1032 | { |
| 1033 | if (writebuf != NULL) |
| 1034 | regcache_cooked_write (regcache, tdep->ppc_fp0_regnum + 1 + i, |
| 1035 | (const bfd_byte *) writebuf + i * 8); |
| 1036 | if (readbuf != NULL) |
| 1037 | regcache_cooked_read (regcache, tdep->ppc_fp0_regnum + 1 + i, |
| 1038 | (bfd_byte *) readbuf + i * 8); |
| 1039 | } |
| 1040 | } |
| 1041 | return RETURN_VALUE_REGISTER_CONVENTION; |
| 1042 | } |
| 1043 | return RETURN_VALUE_STRUCT_CONVENTION; |
| 1044 | } |
| 1045 | |
| 1046 | CORE_ADDR |
| 1047 | ppc64_sysv_abi_adjust_breakpoint_address (struct gdbarch *gdbarch, |
| 1048 | CORE_ADDR bpaddr) |
| 1049 | { |
| 1050 | /* PPC64 SYSV specifies that the minimal-symbol "FN" should point at |
| 1051 | a function-descriptor while the corresponding minimal-symbol |
| 1052 | ".FN" should point at the entry point. Consequently, a command |
| 1053 | like "break FN" applied to an object file with only minimal |
| 1054 | symbols, will insert the breakpoint into the descriptor at "FN" |
| 1055 | and not the function at ".FN". Avoid this confusion by adjusting |
| 1056 | any attempt to set a descriptor breakpoint into a corresponding |
| 1057 | function breakpoint. Note that GDB warns the user when this |
| 1058 | adjustment is applied - that's ok as otherwise the user will have |
| 1059 | no way of knowing why their breakpoint at "FN" resulted in the |
| 1060 | program stopping at ".FN". */ |
| 1061 | return gdbarch_convert_from_func_ptr_addr (gdbarch, bpaddr, ¤t_target); |
| 1062 | } |