| 1 | /* Target machine sub-parameters for SPARC, for GDB, the GNU debugger. |
| 2 | This is included by other tm-*.h files to define SPARC cpu-related info. |
| 3 | Copyright 1986, 1987, 1989, 1991, 1992, 1993, 1994, 1995, 1996, 1997, |
| 4 | 1998, 1999, 2000 |
| 5 | Free Software Foundation, Inc. |
| 6 | Contributed by Michael Tiemann (tiemann@mcc.com) |
| 7 | |
| 8 | This file is part of GDB. |
| 9 | |
| 10 | This program is free software; you can redistribute it and/or modify |
| 11 | it under the terms of the GNU General Public License as published by |
| 12 | the Free Software Foundation; either version 2 of the License, or |
| 13 | (at your option) any later version. |
| 14 | |
| 15 | This program is distributed in the hope that it will be useful, |
| 16 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 17 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 18 | GNU General Public License for more details. |
| 19 | |
| 20 | You should have received a copy of the GNU General Public License |
| 21 | along with this program; if not, write to the Free Software |
| 22 | Foundation, Inc., 59 Temple Place - Suite 330, |
| 23 | Boston, MA 02111-1307, USA. */ |
| 24 | |
| 25 | #include "regcache.h" |
| 26 | |
| 27 | struct type; |
| 28 | struct value; |
| 29 | struct frame_info; |
| 30 | |
| 31 | /* |
| 32 | * The following enums are purely for the convenience of the GDB |
| 33 | * developer, when debugging GDB. |
| 34 | */ |
| 35 | |
| 36 | enum { /* Sparc general registers, for all sparc versions. */ |
| 37 | G0_REGNUM, G1_REGNUM, G2_REGNUM, G3_REGNUM, |
| 38 | G4_REGNUM, G5_REGNUM, G6_REGNUM, G7_REGNUM, |
| 39 | O0_REGNUM, O1_REGNUM, O2_REGNUM, O3_REGNUM, |
| 40 | O4_REGNUM, O5_REGNUM, O6_REGNUM, O7_REGNUM, |
| 41 | L0_REGNUM, L1_REGNUM, L2_REGNUM, L3_REGNUM, |
| 42 | L4_REGNUM, L5_REGNUM, L6_REGNUM, L7_REGNUM, |
| 43 | I0_REGNUM, I1_REGNUM, I2_REGNUM, I3_REGNUM, |
| 44 | I4_REGNUM, I5_REGNUM, I6_REGNUM, I7_REGNUM, |
| 45 | FP0_REGNUM /* Floating point register 0 */ |
| 46 | }; |
| 47 | |
| 48 | enum { /* Sparc general registers, alternate names. */ |
| 49 | R0_REGNUM, R1_REGNUM, R2_REGNUM, R3_REGNUM, |
| 50 | R4_REGNUM, R5_REGNUM, R6_REGNUM, R7_REGNUM, |
| 51 | R8_REGNUM, R9_REGNUM, R10_REGNUM, R11_REGNUM, |
| 52 | R12_REGNUM, R13_REGNUM, R14_REGNUM, R15_REGNUM, |
| 53 | R16_REGNUM, R17_REGNUM, R18_REGNUM, R19_REGNUM, |
| 54 | R20_REGNUM, R21_REGNUM, R22_REGNUM, R23_REGNUM, |
| 55 | R24_REGNUM, R25_REGNUM, R26_REGNUM, R27_REGNUM, |
| 56 | R28_REGNUM, R29_REGNUM, R30_REGNUM, R31_REGNUM |
| 57 | }; |
| 58 | |
| 59 | enum { /* Sparc32 control registers. */ |
| 60 | PS_REGNUM = 65, /* PC, NPC, and Y are omitted because */ |
| 61 | WIM_REGNUM = 66, /* they have different values depending on */ |
| 62 | TBR_REGNUM = 67, /* 32-bit / 64-bit mode. */ |
| 63 | FPS_REGNUM = 70, |
| 64 | CPS_REGNUM = 71 |
| 65 | }; |
| 66 | |
| 67 | /* v9 misc. and priv. regs */ |
| 68 | |
| 69 | /* Note: specifying values explicitly for documentation purposes. */ |
| 70 | enum { /* Sparc64 control registers, excluding Y, PC, and NPC. */ |
| 71 | CCR_REGNUM = 82, /* Condition Code Register (%xcc,%icc) */ |
| 72 | FSR_REGNUM = 83, /* Floating Point State */ |
| 73 | FPRS_REGNUM = 84, /* Floating Point Registers State */ |
| 74 | ASI_REGNUM = 86, /* Alternate Space Identifier */ |
| 75 | VER_REGNUM = 87, /* Version register */ |
| 76 | TICK_REGNUM = 88, /* Tick register */ |
| 77 | PIL_REGNUM = 89, /* Processor Interrupt Level */ |
| 78 | PSTATE_REGNUM = 90, /* Processor State */ |
| 79 | TSTATE_REGNUM = 91, /* Trap State */ |
| 80 | TBA_REGNUM = 92, /* Trap Base Address */ |
| 81 | TL_REGNUM = 93, /* Trap Level */ |
| 82 | TT_REGNUM = 94, /* Trap Type */ |
| 83 | TPC_REGNUM = 95, /* Trap pc */ |
| 84 | TNPC_REGNUM = 96, /* Trap npc */ |
| 85 | WSTATE_REGNUM = 97, /* Window State */ |
| 86 | CWP_REGNUM = 98, /* Current Window Pointer */ |
| 87 | CANSAVE_REGNUM = 99, /* Savable Windows */ |
| 88 | CANRESTORE_REGNUM = 100, /* Restorable Windows */ |
| 89 | CLEANWIN_REGNUM = 101, /* Clean Windows */ |
| 90 | OTHERWIN_REGNUM = 102, /* Other Windows */ |
| 91 | ASR16_REGNUM = 103, /* Ancillary State Registers */ |
| 92 | ASR17_REGNUM = 104, |
| 93 | ASR18_REGNUM = 105, |
| 94 | ASR19_REGNUM = 106, |
| 95 | ASR20_REGNUM = 107, |
| 96 | ASR21_REGNUM = 108, |
| 97 | ASR22_REGNUM = 109, |
| 98 | ASR23_REGNUM = 110, |
| 99 | ASR24_REGNUM = 111, |
| 100 | ASR25_REGNUM = 112, |
| 101 | ASR26_REGNUM = 113, |
| 102 | ASR27_REGNUM = 114, |
| 103 | ASR28_REGNUM = 115, |
| 104 | ASR29_REGNUM = 116, |
| 105 | ASR30_REGNUM = 117, |
| 106 | ASR31_REGNUM = 118, |
| 107 | ICC_REGNUM = 119, /* 32 bit condition codes */ |
| 108 | XCC_REGNUM = 120, /* 64 bit condition codes */ |
| 109 | FCC0_REGNUM = 121, /* fp cc reg 0 */ |
| 110 | FCC1_REGNUM = 122, /* fp cc reg 1 */ |
| 111 | FCC2_REGNUM = 123, /* fp cc reg 2 */ |
| 112 | FCC3_REGNUM = 124 /* fp cc reg 3 */ |
| 113 | }; |
| 114 | |
| 115 | /* |
| 116 | * Make sparc target multi-archable: April 2000 |
| 117 | */ |
| 118 | |
| 119 | #if defined (GDB_MULTI_ARCH) && (GDB_MULTI_ARCH > 0) |
| 120 | |
| 121 | /* Multi-arch definition of TARGET_IS_SPARC64, TARGET_ELF64 */ |
| 122 | #undef GDB_TARGET_IS_SPARC64 |
| 123 | #define GDB_TARGET_IS_SPARC64 \ |
| 124 | (sparc_intreg_size () == 8) |
| 125 | #undef TARGET_ELF64 |
| 126 | #define TARGET_ELF64 \ |
| 127 | (sparc_intreg_size () == 8) |
| 128 | extern int sparc_intreg_size (void); |
| 129 | #else |
| 130 | |
| 131 | /* Non-multi-arch: if it isn't defined, define it to zero. */ |
| 132 | #ifndef GDB_TARGET_IS_SPARC64 |
| 133 | #define GDB_TARGET_IS_SPARC64 0 |
| 134 | #endif |
| 135 | #ifndef TARGET_ELF64 |
| 136 | #define TARGET_ELF64 0 |
| 137 | #endif |
| 138 | #endif |
| 139 | |
| 140 | #if !defined (GDB_MULTI_ARCH) || (GDB_MULTI_ARCH == 0) |
| 141 | /* |
| 142 | * The following defines must go away for MULTI_ARCH |
| 143 | */ |
| 144 | |
| 145 | /* Initializer for an array of names of registers. |
| 146 | There should be NUM_REGS strings in this initializer. */ |
| 147 | |
| 148 | #define REGISTER_NAMES \ |
| 149 | { "g0", "g1", "g2", "g3", "g4", "g5", "g6", "g7", \ |
| 150 | "o0", "o1", "o2", "o3", "o4", "o5", "sp", "o7", \ |
| 151 | "l0", "l1", "l2", "l3", "l4", "l5", "l6", "l7", \ |
| 152 | "i0", "i1", "i2", "i3", "i4", "i5", "fp", "i7", \ |
| 153 | \ |
| 154 | "f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7", \ |
| 155 | "f8", "f9", "f10", "f11", "f12", "f13", "f14", "f15", \ |
| 156 | "f16", "f17", "f18", "f19", "f20", "f21", "f22", "f23", \ |
| 157 | "f24", "f25", "f26", "f27", "f28", "f29", "f30", "f31", \ |
| 158 | \ |
| 159 | "y", "psr", "wim", "tbr", "pc", "npc", "fpsr", "cpsr" \ |
| 160 | } |
| 161 | |
| 162 | #define TARGET_BYTE_ORDER BIG_ENDIAN |
| 163 | |
| 164 | /* Offset from address of function to start of its code. |
| 165 | Zero on most machines. */ |
| 166 | |
| 167 | #define FUNCTION_START_OFFSET 0 |
| 168 | |
| 169 | /* Amount PC must be decremented by after a breakpoint. |
| 170 | This is often the number of bytes in BREAKPOINT |
| 171 | but not always. */ |
| 172 | |
| 173 | #define DECR_PC_AFTER_BREAK 0 |
| 174 | |
| 175 | /* Say how long (ordinary) registers are. This is a piece of bogosity |
| 176 | used in push_word and a few other places; REGISTER_RAW_SIZE is the |
| 177 | real way to know how big a register is. */ |
| 178 | |
| 179 | #define REGISTER_SIZE 4 |
| 180 | |
| 181 | /* Number of machine registers */ |
| 182 | |
| 183 | #define NUM_REGS 72 |
| 184 | |
| 185 | #define SP_REGNUM 14 /* Contains address of top of stack, \ |
| 186 | which is also the bottom of the frame. */ |
| 187 | #define FP_REGNUM 30 /* Contains address of executing stack frame */ |
| 188 | |
| 189 | #define FP0_REGNUM 32 /* Floating point register 0 */ |
| 190 | |
| 191 | #define Y_REGNUM 64 /* Temp register for multiplication, etc. */ |
| 192 | |
| 193 | #define PC_REGNUM 68 /* Contains program counter */ |
| 194 | |
| 195 | #define NPC_REGNUM 69 /* Contains next PC */ |
| 196 | |
| 197 | |
| 198 | /* Total amount of space needed to store our copies of the machine's |
| 199 | register state, the array `registers'. On the sparc, `registers' |
| 200 | contains the ins and locals, even though they are saved on the |
| 201 | stack rather than with the other registers, and this causes hair |
| 202 | and confusion in places like pop_frame. It might be better to |
| 203 | remove the ins and locals from `registers', make sure that |
| 204 | get_saved_register can get them from the stack (even in the |
| 205 | innermost frame), and make this the way to access them. For the |
| 206 | frame pointer we would do that via TARGET_READ_FP. On the other |
| 207 | hand, that is likely to be confusing or worse for flat frames. */ |
| 208 | |
| 209 | #define REGISTER_BYTES (32*4+32*4+8*4) |
| 210 | |
| 211 | /* Index within `registers' of the first byte of the space for |
| 212 | register N. */ |
| 213 | |
| 214 | #define REGISTER_BYTE(N) ((N)*4) |
| 215 | |
| 216 | /* Number of bytes of storage in the actual machine representation for |
| 217 | register N. */ |
| 218 | |
| 219 | /* On the SPARC, all regs are 4 bytes (except Sparc64, where they're 8). */ |
| 220 | |
| 221 | #define REGISTER_RAW_SIZE(N) (4) |
| 222 | |
| 223 | /* Number of bytes of storage in the program's representation |
| 224 | for register N. */ |
| 225 | |
| 226 | /* On the SPARC, all regs are 4 bytes (except Sparc64, where they're 8). */ |
| 227 | |
| 228 | #define REGISTER_VIRTUAL_SIZE(N) (4) |
| 229 | |
| 230 | /* Largest value REGISTER_RAW_SIZE can have. */ |
| 231 | |
| 232 | #define MAX_REGISTER_RAW_SIZE 8 |
| 233 | |
| 234 | /* Largest value REGISTER_VIRTUAL_SIZE can have. */ |
| 235 | |
| 236 | #define MAX_REGISTER_VIRTUAL_SIZE 8 |
| 237 | |
| 238 | /* Return the GDB type object for the "standard" data type |
| 239 | of data in register N. */ |
| 240 | |
| 241 | #define REGISTER_VIRTUAL_TYPE(N) \ |
| 242 | ((N) < 32 ? builtin_type_int : (N) < 64 ? builtin_type_float : \ |
| 243 | builtin_type_int) |
| 244 | |
| 245 | /* Sun /bin/cc gets this right as of SunOS 4.1.x. We need to define |
| 246 | BELIEVE_PCC_PROMOTION to get this right now that the code which |
| 247 | detects gcc2_compiled. is broken. This loses for SunOS 4.0.x and |
| 248 | earlier. */ |
| 249 | |
| 250 | #define BELIEVE_PCC_PROMOTION 1 |
| 251 | |
| 252 | /* Advance PC across any function entry prologue instructions |
| 253 | to reach some "real" code. SKIP_PROLOGUE_FRAMELESS_P advances |
| 254 | the PC past some of the prologue, but stops as soon as it |
| 255 | knows that the function has a frame. Its result is equal |
| 256 | to its input PC if the function is frameless, unequal otherwise. */ |
| 257 | |
| 258 | #define SKIP_PROLOGUE(PC) sparc_skip_prologue (PC, 0) |
| 259 | |
| 260 | /* Immediately after a function call, return the saved pc. |
| 261 | Can't go through the frames for this because on some machines |
| 262 | the new frame is not set up until the new function executes |
| 263 | some instructions. */ |
| 264 | |
| 265 | #define SAVED_PC_AFTER_CALL(FRAME) PC_ADJUST (read_register (RP_REGNUM)) |
| 266 | |
| 267 | /* Stack grows downward. */ |
| 268 | |
| 269 | #define INNER_THAN(LHS,RHS) ((LHS) < (RHS)) |
| 270 | |
| 271 | /* Write into appropriate registers a function return value of type |
| 272 | TYPE, given in virtual format. */ |
| 273 | |
| 274 | #define STORE_RETURN_VALUE(TYPE, VALBUF) \ |
| 275 | sparc_store_return_value (TYPE, VALBUF) |
| 276 | extern void sparc_store_return_value (struct type *, char *); |
| 277 | |
| 278 | /* Extract from an array REGBUF containing the (raw) register state |
| 279 | the address in which a function should return its structure value, |
| 280 | as a CORE_ADDR (or an expression that can be used as one). */ |
| 281 | |
| 282 | #define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) \ |
| 283 | sparc_extract_struct_value_address (REGBUF) |
| 284 | |
| 285 | extern CORE_ADDR sparc_extract_struct_value_address (char *); |
| 286 | |
| 287 | /* If the current gcc for for this target does not produce correct |
| 288 | debugging information for float parameters, both prototyped and |
| 289 | unprototyped, then define this macro. This forces gdb to always |
| 290 | assume that floats are passed as doubles and then converted in the |
| 291 | callee. */ |
| 292 | |
| 293 | #define COERCE_FLOAT_TO_DOUBLE(FORMAL, ACTUAL) (1) |
| 294 | |
| 295 | /* Stack must be aligned on 64-bit boundaries when synthesizing |
| 296 | function calls (128-bit for sparc64). */ |
| 297 | |
| 298 | #define STACK_ALIGN(ADDR) sparc32_stack_align (ADDR) |
| 299 | extern CORE_ADDR sparc32_stack_align (CORE_ADDR addr); |
| 300 | |
| 301 | /* Floating point is IEEE compatible. */ |
| 302 | #define IEEE_FLOAT (1) |
| 303 | |
| 304 | /* The Sparc returns long doubles on the stack. */ |
| 305 | |
| 306 | #define RETURN_VALUE_ON_STACK(TYPE) \ |
| 307 | (TYPE_CODE(TYPE) == TYPE_CODE_FLT \ |
| 308 | && TYPE_LENGTH(TYPE) > 8) |
| 309 | |
| 310 | /* When passing a structure to a function, Sun cc passes the address |
| 311 | not the structure itself. It (under SunOS4) creates two symbols, |
| 312 | which we need to combine to a LOC_REGPARM. Gcc version two (as of |
| 313 | 1.92) behaves like sun cc. REG_STRUCT_HAS_ADDR is smart enough to |
| 314 | distinguish between Sun cc, gcc version 1 and gcc version 2. */ |
| 315 | |
| 316 | #define REG_STRUCT_HAS_ADDR(GCC_P, TYPE) \ |
| 317 | sparc_reg_struct_has_addr (GCC_P, TYPE) |
| 318 | extern int sparc_reg_struct_has_addr (int, struct type *); |
| 319 | |
| 320 | #endif /* GDB_MULTI_ARCH */ |
| 321 | |
| 322 | #if defined (GDB_MULTI_ARCH) && (GDB_MULTI_ARCH > 0) |
| 323 | /* |
| 324 | * The following defines should ONLY appear for MULTI_ARCH. |
| 325 | */ |
| 326 | |
| 327 | /* Multi-arch the nPC and Y registers. */ |
| 328 | #define Y_REGNUM (sparc_y_regnum ()) |
| 329 | extern int sparc_npc_regnum (void); |
| 330 | extern int sparc_y_regnum (void); |
| 331 | |
| 332 | #endif /* GDB_MULTI_ARCH */ |
| 333 | |
| 334 | /* On the Sun 4 under SunOS, the compile will leave a fake insn which |
| 335 | encodes the structure size being returned. If we detect such |
| 336 | a fake insn, step past it. */ |
| 337 | |
| 338 | #define PC_ADJUST(PC) sparc_pc_adjust (PC) |
| 339 | extern CORE_ADDR sparc_pc_adjust (CORE_ADDR); |
| 340 | |
| 341 | /* Advance PC across any function entry prologue instructions to reach |
| 342 | some "real" code. SKIP_PROLOGUE_FRAMELESS_P advances the PC past |
| 343 | some of the prologue, but stops as soon as it knows that the |
| 344 | function has a frame. Its result is equal to its input PC if the |
| 345 | function is frameless, unequal otherwise. */ |
| 346 | |
| 347 | #define SKIP_PROLOGUE_FRAMELESS_P(PC) sparc_skip_prologue (PC, 1) |
| 348 | extern CORE_ADDR sparc_skip_prologue (CORE_ADDR, int); |
| 349 | |
| 350 | /* If an argument is declared "register", Sun cc will keep it in a register, |
| 351 | never saving it onto the stack. So we better not believe the "p" symbol |
| 352 | descriptor stab. */ |
| 353 | |
| 354 | #define USE_REGISTER_NOT_ARG |
| 355 | |
| 356 | /* For acc, there's no need to correct LBRAC entries by guessing how |
| 357 | they should work. In fact, this is harmful because the LBRAC |
| 358 | entries now all appear at the end of the function, not intermixed |
| 359 | with the SLINE entries. n_opt_found detects acc for Solaris binaries; |
| 360 | function_stab_type detects acc for SunOS4 binaries. |
| 361 | |
| 362 | For binary from SunOS4 /bin/cc, need to correct LBRAC's. |
| 363 | |
| 364 | For gcc, like acc, don't correct. */ |
| 365 | |
| 366 | #define SUN_FIXED_LBRAC_BUG \ |
| 367 | (n_opt_found \ |
| 368 | || function_stab_type == N_STSYM \ |
| 369 | || function_stab_type == N_GSYM \ |
| 370 | || processing_gcc_compilation) |
| 371 | |
| 372 | /* Do variables in the debug stabs occur after the N_LBRAC or before it? |
| 373 | acc: after, gcc: before, SunOS4 /bin/cc: before. */ |
| 374 | |
| 375 | #define VARIABLES_INSIDE_BLOCK(desc, gcc_p) \ |
| 376 | (!(gcc_p) \ |
| 377 | && (n_opt_found \ |
| 378 | || function_stab_type == N_STSYM \ |
| 379 | || function_stab_type == N_GSYM)) |
| 380 | |
| 381 | /* Sequence of bytes for breakpoint instruction (ta 1). */ |
| 382 | |
| 383 | #define BREAKPOINT {0x91, 0xd0, 0x20, 0x01} |
| 384 | |
| 385 | /* Register numbers of various important registers. |
| 386 | Note that some of these values are "real" register numbers, |
| 387 | and correspond to the general registers of the machine, |
| 388 | and some are "phony" register numbers which are too large |
| 389 | to be actual register numbers as far as the user is concerned |
| 390 | but do serve to get the desired values when passed to read_register. */ |
| 391 | |
| 392 | #define G0_REGNUM 0 /* %g0 */ |
| 393 | #define G1_REGNUM 1 /* %g1 */ |
| 394 | #define O0_REGNUM 8 /* %o0 */ |
| 395 | #define RP_REGNUM 15 /* Contains return address value, *before* \ |
| 396 | any windows get switched. */ |
| 397 | #define O7_REGNUM 15 /* Last local reg not saved on stack frame */ |
| 398 | #define L0_REGNUM 16 /* First local reg that's saved on stack frame |
| 399 | rather than in machine registers */ |
| 400 | #define I0_REGNUM 24 /* %i0 */ |
| 401 | #define I7_REGNUM 31 /* Last local reg saved on stack frame */ |
| 402 | #define PS_REGNUM 65 /* Contains processor status */ |
| 403 | #define PS_FLAG_CARRY 0x100000 /* Carry bit in PS */ |
| 404 | #define WIM_REGNUM 66 /* Window Invalid Mask (not really supported) */ |
| 405 | #define TBR_REGNUM 67 /* Trap Base Register (not really supported) */ |
| 406 | #define FPS_REGNUM 70 /* Floating point status register */ |
| 407 | #define CPS_REGNUM 71 /* Coprocessor status register */ |
| 408 | |
| 409 | /* Writing to %g0 is a noop (not an error or exception or anything like |
| 410 | that, however). */ |
| 411 | |
| 412 | #define CANNOT_STORE_REGISTER(regno) ((regno) == G0_REGNUM) |
| 413 | |
| 414 | /* |
| 415 | * FRAME_CHAIN and FRAME_INFO definitions, collected here for convenience. |
| 416 | */ |
| 417 | |
| 418 | #if !defined (GDB_MULTI_ARCH) || (GDB_MULTI_ARCH == 0) |
| 419 | /* |
| 420 | * The following defines must go away for MULTI_ARCH. |
| 421 | */ |
| 422 | |
| 423 | /* Describe the pointer in each stack frame to the previous stack frame |
| 424 | (its caller). */ |
| 425 | |
| 426 | /* FRAME_CHAIN takes a frame's nominal address |
| 427 | and produces the frame's chain-pointer. */ |
| 428 | |
| 429 | /* In the case of the Sun 4, the frame-chain's nominal address |
| 430 | is held in the frame pointer register. |
| 431 | |
| 432 | On the Sun4, the frame (in %fp) is %sp for the previous frame. |
| 433 | From the previous frame's %sp, we can find the previous frame's |
| 434 | %fp: it is in the save area just above the previous frame's %sp. |
| 435 | |
| 436 | If we are setting up an arbitrary frame, we'll need to know where |
| 437 | it ends. Hence the following. This part of the frame cache |
| 438 | structure should be checked before it is assumed that this frame's |
| 439 | bottom is in the stack pointer. |
| 440 | |
| 441 | If there isn't a frame below this one, the bottom of this frame is |
| 442 | in the stack pointer. |
| 443 | |
| 444 | If there is a frame below this one, and the frame pointers are |
| 445 | identical, it's a leaf frame and the bottoms are the same also. |
| 446 | |
| 447 | Otherwise the bottom of this frame is the top of the next frame. |
| 448 | |
| 449 | The bottom field is misnamed, since it might imply that memory from |
| 450 | bottom to frame contains this frame. That need not be true if |
| 451 | stack frames are allocated in different segments (e.g. some on a |
| 452 | stack, some on a heap in the data segment). |
| 453 | |
| 454 | GCC 2.6 and later can generate ``flat register window'' code that |
| 455 | makes frames by explicitly saving those registers that need to be |
| 456 | saved. %i7 is used as the frame pointer, and the frame is laid out |
| 457 | so that flat and non-flat calls can be intermixed freely within a |
| 458 | program. Unfortunately for GDB, this means it must detect and |
| 459 | record the flatness of frames. |
| 460 | |
| 461 | Since the prologue in a flat frame also tells us where fp and pc |
| 462 | have been stashed (the frame is of variable size, so their location |
| 463 | is not fixed), it's convenient to record them in the frame info. */ |
| 464 | |
| 465 | #define EXTRA_FRAME_INFO \ |
| 466 | CORE_ADDR bottom; \ |
| 467 | int in_prologue; \ |
| 468 | int flat; \ |
| 469 | /* Following fields only relevant for flat frames. */ \ |
| 470 | CORE_ADDR pc_addr; \ |
| 471 | CORE_ADDR fp_addr; \ |
| 472 | /* Add this to ->frame to get the value of the stack pointer at the */ \ |
| 473 | /* time of the register saves. */ \ |
| 474 | int sp_offset; |
| 475 | |
| 476 | /* We need to override GET_SAVED_REGISTER so that we can deal with the way |
| 477 | outs change into ins in different frames. HAVE_REGISTER_WINDOWS can't |
| 478 | deal with this case and also handle flat frames at the same time. */ |
| 479 | |
| 480 | void sparc_get_saved_register (char *raw_buffer, |
| 481 | int *optimized, |
| 482 | CORE_ADDR * addrp, |
| 483 | struct frame_info *frame, |
| 484 | int regnum, enum lval_type *lvalp); |
| 485 | |
| 486 | #define GET_SAVED_REGISTER(RAW_BUFFER, OPTIMIZED, ADDRP, FRAME, REGNUM, LVAL) \ |
| 487 | sparc_get_saved_register (RAW_BUFFER, OPTIMIZED, ADDRP, \ |
| 488 | FRAME, REGNUM, LVAL) |
| 489 | |
| 490 | #define FRAME_INIT_SAVED_REGS(FP) /*no-op */ |
| 491 | |
| 492 | #define INIT_EXTRA_FRAME_INFO(FROMLEAF, FCI) \ |
| 493 | sparc_init_extra_frame_info (FROMLEAF, FCI) |
| 494 | extern void sparc_init_extra_frame_info (int, struct frame_info *); |
| 495 | |
| 496 | #define FRAME_CHAIN(THISFRAME) (sparc_frame_chain (THISFRAME)) |
| 497 | extern CORE_ADDR sparc_frame_chain (struct frame_info *); |
| 498 | |
| 499 | /* A macro that tells us whether the function invocation represented |
| 500 | by FI does not have a frame on the stack associated with it. If it |
| 501 | does not, FRAMELESS is set to 1, else 0. */ |
| 502 | |
| 503 | #define FRAMELESS_FUNCTION_INVOCATION(FI) \ |
| 504 | frameless_look_for_prologue (FI) |
| 505 | |
| 506 | /* Where is the PC for a specific frame */ |
| 507 | |
| 508 | #define FRAME_SAVED_PC(FRAME) sparc_frame_saved_pc (FRAME) |
| 509 | extern CORE_ADDR sparc_frame_saved_pc (struct frame_info *); |
| 510 | |
| 511 | /* If the argument is on the stack, it will be here. */ |
| 512 | #define FRAME_ARGS_ADDRESS(FI) ((FI)->frame) |
| 513 | |
| 514 | #define FRAME_LOCALS_ADDRESS(FI) ((FI)->frame) |
| 515 | |
| 516 | /* Set VAL to the number of args passed to frame described by FI. |
| 517 | Can set VAL to -1, meaning no way to tell. */ |
| 518 | |
| 519 | /* We can't tell how many args there are |
| 520 | now that the C compiler delays popping them. */ |
| 521 | #define FRAME_NUM_ARGS(FI) (-1) |
| 522 | |
| 523 | /* Return number of bytes at start of arglist that are not really args. */ |
| 524 | |
| 525 | #define FRAME_ARGS_SKIP 68 |
| 526 | |
| 527 | #endif /* GDB_MULTI_ARCH */ |
| 528 | |
| 529 | #define PRINT_EXTRA_FRAME_INFO(FI) \ |
| 530 | sparc_print_extra_frame_info (FI) |
| 531 | extern void sparc_print_extra_frame_info (struct frame_info *); |
| 532 | |
| 533 | /* INIT_EXTRA_FRAME_INFO needs the PC to detect flat frames. */ |
| 534 | |
| 535 | #define INIT_FRAME_PC(FROMLEAF, PREV) /* nothing */ |
| 536 | #define INIT_FRAME_PC_FIRST(FROMLEAF, PREV) \ |
| 537 | (PREV)->pc = ((FROMLEAF) ? SAVED_PC_AFTER_CALL ((PREV)->next) : \ |
| 538 | (PREV)->next ? FRAME_SAVED_PC ((PREV)->next) : read_pc ()); |
| 539 | |
| 540 | /* Define other aspects of the stack frame. */ |
| 541 | |
| 542 | /* The location of I0 w.r.t SP. This is actually dependent on how the |
| 543 | system's window overflow/underflow routines are written. Most |
| 544 | vendors save the L regs followed by the I regs (at the higher |
| 545 | address). Some vendors get it wrong. */ |
| 546 | |
| 547 | #define FRAME_SAVED_L0 0 |
| 548 | #define FRAME_SAVED_I0 (8 * REGISTER_RAW_SIZE (L0_REGNUM)) |
| 549 | |
| 550 | #define FRAME_STRUCT_ARGS_ADDRESS(FI) ((FI)->frame) |
| 551 | |
| 552 | /* Things needed for making the inferior call functions. */ |
| 553 | /* |
| 554 | * First of all, let me give my opinion of what the DUMMY_FRAME |
| 555 | * actually looks like. |
| 556 | * |
| 557 | * | | |
| 558 | * | | |
| 559 | * + - - - - - - - - - - - - - - - - +<-- fp (level 0) |
| 560 | * | | |
| 561 | * | | |
| 562 | * | | |
| 563 | * | | |
| 564 | * | Frame of innermost program | |
| 565 | * | function | |
| 566 | * | | |
| 567 | * | | |
| 568 | * | | |
| 569 | * | | |
| 570 | * | | |
| 571 | * |---------------------------------|<-- sp (level 0), fp (c) |
| 572 | * | | |
| 573 | * DUMMY | fp0-31 | |
| 574 | * | | |
| 575 | * | ------ |<-- fp - 0x80 |
| 576 | * FRAME | g0-7 |<-- fp - 0xa0 |
| 577 | * | i0-7 |<-- fp - 0xc0 |
| 578 | * | other |<-- fp - 0xe0 |
| 579 | * | ? | |
| 580 | * | ? | |
| 581 | * |---------------------------------|<-- sp' = fp - 0x140 |
| 582 | * | | |
| 583 | * xcution start | | |
| 584 | * sp' + 0x94 -->| CALL_DUMMY (x code) | |
| 585 | * | | |
| 586 | * | | |
| 587 | * |---------------------------------|<-- sp'' = fp - 0x200 |
| 588 | * | align sp to 8 byte boundary | |
| 589 | * | ==> args to fn <== | |
| 590 | * Room for | | |
| 591 | * i & l's + agg | CALL_DUMMY_STACK_ADJUST = 0x0x44| |
| 592 | * |---------------------------------|<-- final sp (variable) |
| 593 | * | | |
| 594 | * | Where function called will | |
| 595 | * | build frame. | |
| 596 | * | | |
| 597 | * | | |
| 598 | * |
| 599 | * I understand everything in this picture except what the space |
| 600 | * between fp - 0xe0 and fp - 0x140 is used for. Oh, and I don't |
| 601 | * understand why there's a large chunk of CALL_DUMMY that never gets |
| 602 | * executed (its function is superceeded by PUSH_DUMMY_FRAME; they |
| 603 | * are designed to do the same thing). |
| 604 | * |
| 605 | * PUSH_DUMMY_FRAME saves the registers above sp' and pushes the |
| 606 | * register file stack down one. |
| 607 | * |
| 608 | * call_function then writes CALL_DUMMY, pushes the args onto the |
| 609 | * stack, and adjusts the stack pointer. |
| 610 | * |
| 611 | * run_stack_dummy then starts execution (in the middle of |
| 612 | * CALL_DUMMY, as directed by call_function). |
| 613 | */ |
| 614 | |
| 615 | #ifndef CALL_DUMMY |
| 616 | /* This sequence of words is the instructions |
| 617 | |
| 618 | 00: bc 10 00 01 mov %g1, %fp |
| 619 | 04: 9d e3 80 00 save %sp, %g0, %sp |
| 620 | 08: bc 10 00 02 mov %g2, %fp |
| 621 | 0c: be 10 00 03 mov %g3, %i7 |
| 622 | 10: da 03 a0 58 ld [ %sp + 0x58 ], %o5 |
| 623 | 14: d8 03 a0 54 ld [ %sp + 0x54 ], %o4 |
| 624 | 18: d6 03 a0 50 ld [ %sp + 0x50 ], %o3 |
| 625 | 1c: d4 03 a0 4c ld [ %sp + 0x4c ], %o2 |
| 626 | 20: d2 03 a0 48 ld [ %sp + 0x48 ], %o1 |
| 627 | 24: 40 00 00 00 call <fun> |
| 628 | 28: d0 03 a0 44 ld [ %sp + 0x44 ], %o0 |
| 629 | 2c: 01 00 00 00 nop |
| 630 | 30: 91 d0 20 01 ta 1 |
| 631 | 34: 01 00 00 00 nop |
| 632 | |
| 633 | NOTES: |
| 634 | * the first four instructions are necessary only on the simulator. |
| 635 | * this is a multiple of 8 (not only 4) bytes. |
| 636 | * the `call' insn is a relative, not an absolute call. |
| 637 | * the `nop' at the end is needed to keep the trap from |
| 638 | clobbering things (if NPC pointed to garbage instead). |
| 639 | */ |
| 640 | |
| 641 | #if !defined (GDB_MULTI_ARCH) || (GDB_MULTI_ARCH == 0) |
| 642 | /* |
| 643 | * The following defines must go away for MULTI_ARCH. |
| 644 | */ |
| 645 | |
| 646 | #define CALL_DUMMY { 0xbc100001, 0x9de38000, 0xbc100002, 0xbe100003, \ |
| 647 | 0xda03a058, 0xd803a054, 0xd603a050, 0xd403a04c, \ |
| 648 | 0xd203a048, 0x40000000, 0xd003a044, 0x01000000, \ |
| 649 | 0x91d02001, 0x01000000 } |
| 650 | |
| 651 | |
| 652 | /* Size of the call dummy in bytes. */ |
| 653 | |
| 654 | #define CALL_DUMMY_LENGTH 0x38 |
| 655 | |
| 656 | /* Offset within call dummy of first instruction to execute. */ |
| 657 | |
| 658 | #define CALL_DUMMY_START_OFFSET 0 |
| 659 | |
| 660 | /* Offset within CALL_DUMMY of the 'call' instruction. */ |
| 661 | |
| 662 | #define CALL_DUMMY_CALL_OFFSET (CALL_DUMMY_START_OFFSET + 0x24) |
| 663 | |
| 664 | /* Offset within CALL_DUMMY of the 'ta 1' trap instruction. */ |
| 665 | |
| 666 | #define CALL_DUMMY_BREAKPOINT_OFFSET (CALL_DUMMY_START_OFFSET + 0x30) |
| 667 | |
| 668 | #define CALL_DUMMY_STACK_ADJUST 68 |
| 669 | |
| 670 | /* Call dummy method (eg. on stack, at entry point, etc.) */ |
| 671 | |
| 672 | #define CALL_DUMMY_LOCATION ON_STACK |
| 673 | |
| 674 | /* Method for detecting dummy frames. */ |
| 675 | |
| 676 | #define PC_IN_CALL_DUMMY(PC, SP, FRAME_ADDRESS) \ |
| 677 | pc_in_call_dummy_on_stack (PC, SP, FRAME_ADDRESS) |
| 678 | |
| 679 | #endif /* GDB_MULTI_ARCH */ |
| 680 | |
| 681 | #endif /* CALL_DUMMY */ |
| 682 | |
| 683 | #if !defined (GDB_MULTI_ARCH) || (GDB_MULTI_ARCH == 0) |
| 684 | /* |
| 685 | * The following defines must go away for MULTI_ARCH. |
| 686 | */ |
| 687 | |
| 688 | /* Insert the specified number of args and function address |
| 689 | into a call sequence of the above form stored at DUMMYNAME. */ |
| 690 | |
| 691 | #define FIX_CALL_DUMMY(DUMMYNAME, PC, FUN, NARGS, ARGS, TYPE, GCC_P) \ |
| 692 | sparc_fix_call_dummy (DUMMYNAME, PC, FUN, TYPE, GCC_P) |
| 693 | void sparc_fix_call_dummy (char *dummy, CORE_ADDR pc, CORE_ADDR fun, |
| 694 | struct type *value_type, int using_gcc); |
| 695 | |
| 696 | /* Arguments smaller than an int must be promoted to ints when |
| 697 | synthesizing function calls. */ |
| 698 | |
| 699 | /* Push an empty stack frame, to record the current PC, etc. */ |
| 700 | |
| 701 | #define PUSH_DUMMY_FRAME sparc_push_dummy_frame () |
| 702 | #define POP_FRAME sparc_pop_frame () |
| 703 | |
| 704 | void sparc_push_dummy_frame (void); |
| 705 | void sparc_pop_frame (void); |
| 706 | |
| 707 | #define PUSH_ARGUMENTS(NARGS, ARGS, SP, STRUCT_RETURN, STRUCT_ADDR) \ |
| 708 | sparc32_push_arguments (NARGS, ARGS, SP, STRUCT_RETURN, STRUCT_ADDR) |
| 709 | |
| 710 | extern CORE_ADDR |
| 711 | sparc32_push_arguments (int, struct value **, CORE_ADDR, int, CORE_ADDR); |
| 712 | |
| 713 | /* Store the address of the place in which to copy the structure the |
| 714 | subroutine will return. This is called from call_function_by_hand. |
| 715 | The ultimate mystery is, tho, what is the value "16"? */ |
| 716 | |
| 717 | #define STORE_STRUCT_RETURN(ADDR, SP) \ |
| 718 | { char val[4]; \ |
| 719 | store_unsigned_integer (val, 4, (ADDR)); \ |
| 720 | write_memory ((SP)+(16*4), val, 4); } |
| 721 | |
| 722 | /* Default definition of USE_STRUCT_CONVENTION. */ |
| 723 | |
| 724 | #ifndef USE_STRUCT_CONVENTION |
| 725 | #define USE_STRUCT_CONVENTION(GCC_P, TYPE) \ |
| 726 | generic_use_struct_convention (GCC_P, TYPE) |
| 727 | #endif |
| 728 | |
| 729 | /* Extract from an array REGBUF containing the (raw) register state a |
| 730 | function return value of type TYPE, and copy that, in virtual |
| 731 | format, into VALBUF. */ |
| 732 | |
| 733 | #define EXTRACT_RETURN_VALUE(TYPE, REGBUF, VALBUF) \ |
| 734 | sparc32_extract_return_value (TYPE, REGBUF, VALBUF) |
| 735 | extern void sparc32_extract_return_value (struct type *, char[], char *); |
| 736 | |
| 737 | #endif /* GDB_MULTI_ARCH */ |
| 738 | |
| 739 | \f |
| 740 | /* Sparc has no reliable single step ptrace call */ |
| 741 | |
| 742 | #define SOFTWARE_SINGLE_STEP_P() 1 |
| 743 | extern void sparc_software_single_step (enum target_signal, int); |
| 744 | #define SOFTWARE_SINGLE_STEP(sig,bp_p) sparc_software_single_step (sig,bp_p) |
| 745 | |
| 746 | /* We need more arguments in a frame specification for the |
| 747 | "frame" or "info frame" command. */ |
| 748 | |
| 749 | #define SETUP_ARBITRARY_FRAME(argc, argv) setup_arbitrary_frame (argc, argv) |
| 750 | extern struct frame_info *setup_arbitrary_frame (int, CORE_ADDR *); |
| 751 | |
| 752 | /* To print every pair of float registers as a double, we use this hook. |
| 753 | We also print the condition code registers in a readable format |
| 754 | (FIXME: can expand this to all control regs). */ |
| 755 | |
| 756 | #undef PRINT_REGISTER_HOOK |
| 757 | #define PRINT_REGISTER_HOOK(regno) \ |
| 758 | sparc_print_register_hook (regno) |
| 759 | extern void sparc_print_register_hook (int regno); |
| 760 | |
| 761 | /* Optimization for storing registers to the inferior. The hook |
| 762 | DO_DEFERRED_STORES |
| 763 | actually executes any deferred stores. It is called any time |
| 764 | we are going to proceed the child, or read its registers. |
| 765 | The hook CLEAR_DEFERRED_STORES is called when we want to throw |
| 766 | away the inferior process, e.g. when it dies or we kill it. |
| 767 | FIXME, this does not handle remote debugging cleanly. */ |
| 768 | |
| 769 | extern int deferred_stores; |
| 770 | #define DO_DEFERRED_STORES \ |
| 771 | if (deferred_stores) \ |
| 772 | target_store_registers (-2); |
| 773 | #define CLEAR_DEFERRED_STORES \ |
| 774 | deferred_stores = 0; |
| 775 | |
| 776 | /* Select the sparc disassembler */ |
| 777 | |
| 778 | #define TM_PRINT_INSN_MACH bfd_mach_sparc |
| 779 | |