| 1 | /* Target-dependent code for Atmel AVR, for GDB. |
| 2 | |
| 3 | Copyright (C) 1996-2017 Free Software Foundation, Inc. |
| 4 | |
| 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 3 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, see <http://www.gnu.org/licenses/>. */ |
| 19 | |
| 20 | /* Contributed by Theodore A. Roth, troth@openavr.org */ |
| 21 | |
| 22 | /* Portions of this file were taken from the original gdb-4.18 patch developed |
| 23 | by Denis Chertykov, denisc@overta.ru */ |
| 24 | |
| 25 | #include "defs.h" |
| 26 | #include "frame.h" |
| 27 | #include "frame-unwind.h" |
| 28 | #include "frame-base.h" |
| 29 | #include "trad-frame.h" |
| 30 | #include "gdbcmd.h" |
| 31 | #include "gdbcore.h" |
| 32 | #include "gdbtypes.h" |
| 33 | #include "inferior.h" |
| 34 | #include "symfile.h" |
| 35 | #include "arch-utils.h" |
| 36 | #include "regcache.h" |
| 37 | #include "dis-asm.h" |
| 38 | #include "objfiles.h" |
| 39 | #include <algorithm> |
| 40 | |
| 41 | /* AVR Background: |
| 42 | |
| 43 | (AVR micros are pure Harvard Architecture processors.) |
| 44 | |
| 45 | The AVR family of microcontrollers have three distinctly different memory |
| 46 | spaces: flash, sram and eeprom. The flash is 16 bits wide and is used for |
| 47 | the most part to store program instructions. The sram is 8 bits wide and is |
| 48 | used for the stack and the heap. Some devices lack sram and some can have |
| 49 | an additional external sram added on as a peripheral. |
| 50 | |
| 51 | The eeprom is 8 bits wide and is used to store data when the device is |
| 52 | powered down. Eeprom is not directly accessible, it can only be accessed |
| 53 | via io-registers using a special algorithm. Accessing eeprom via gdb's |
| 54 | remote serial protocol ('m' or 'M' packets) looks difficult to do and is |
| 55 | not included at this time. |
| 56 | |
| 57 | [The eeprom could be read manually via ``x/b <eaddr + AVR_EMEM_START>'' or |
| 58 | written using ``set {unsigned char}<eaddr + AVR_EMEM_START>''. For this to |
| 59 | work, the remote target must be able to handle eeprom accesses and perform |
| 60 | the address translation.] |
| 61 | |
| 62 | All three memory spaces have physical addresses beginning at 0x0. In |
| 63 | addition, the flash is addressed by gcc/binutils/gdb with respect to 8 bit |
| 64 | bytes instead of the 16 bit wide words used by the real device for the |
| 65 | Program Counter. |
| 66 | |
| 67 | In order for remote targets to work correctly, extra bits must be added to |
| 68 | addresses before they are send to the target or received from the target |
| 69 | via the remote serial protocol. The extra bits are the MSBs and are used to |
| 70 | decode which memory space the address is referring to. */ |
| 71 | |
| 72 | /* Constants: prefixed with AVR_ to avoid name space clashes */ |
| 73 | |
| 74 | /* Address space flags */ |
| 75 | |
| 76 | /* We are assigning the TYPE_INSTANCE_FLAG_ADDRESS_CLASS_1 to the flash address |
| 77 | space. */ |
| 78 | |
| 79 | #define AVR_TYPE_ADDRESS_CLASS_FLASH TYPE_ADDRESS_CLASS_1 |
| 80 | #define AVR_TYPE_INSTANCE_FLAG_ADDRESS_CLASS_FLASH \ |
| 81 | TYPE_INSTANCE_FLAG_ADDRESS_CLASS_1 |
| 82 | |
| 83 | |
| 84 | enum |
| 85 | { |
| 86 | AVR_REG_W = 24, |
| 87 | AVR_REG_X = 26, |
| 88 | AVR_REG_Y = 28, |
| 89 | AVR_FP_REGNUM = 28, |
| 90 | AVR_REG_Z = 30, |
| 91 | |
| 92 | AVR_SREG_REGNUM = 32, |
| 93 | AVR_SP_REGNUM = 33, |
| 94 | AVR_PC_REGNUM = 34, |
| 95 | |
| 96 | AVR_NUM_REGS = 32 + 1 /*SREG*/ + 1 /*SP*/ + 1 /*PC*/, |
| 97 | AVR_NUM_REG_BYTES = 32 + 1 /*SREG*/ + 2 /*SP*/ + 4 /*PC*/, |
| 98 | |
| 99 | /* Pseudo registers. */ |
| 100 | AVR_PSEUDO_PC_REGNUM = 35, |
| 101 | AVR_NUM_PSEUDO_REGS = 1, |
| 102 | |
| 103 | AVR_PC_REG_INDEX = 35, /* index into array of registers */ |
| 104 | |
| 105 | AVR_MAX_PROLOGUE_SIZE = 64, /* bytes */ |
| 106 | |
| 107 | /* Count of pushed registers. From r2 to r17 (inclusively), r28, r29 */ |
| 108 | AVR_MAX_PUSHES = 18, |
| 109 | |
| 110 | /* Number of the last pushed register. r17 for current avr-gcc */ |
| 111 | AVR_LAST_PUSHED_REGNUM = 17, |
| 112 | |
| 113 | AVR_ARG1_REGNUM = 24, /* Single byte argument */ |
| 114 | AVR_ARGN_REGNUM = 25, /* Multi byte argments */ |
| 115 | AVR_LAST_ARG_REGNUM = 8, /* Last argument register */ |
| 116 | |
| 117 | AVR_RET1_REGNUM = 24, /* Single byte return value */ |
| 118 | AVR_RETN_REGNUM = 25, /* Multi byte return value */ |
| 119 | |
| 120 | /* FIXME: TRoth/2002-01-??: Can we shift all these memory masks left 8 |
| 121 | bits? Do these have to match the bfd vma values? It sure would make |
| 122 | things easier in the future if they didn't need to match. |
| 123 | |
| 124 | Note: I chose these values so as to be consistent with bfd vma |
| 125 | addresses. |
| 126 | |
| 127 | TRoth/2002-04-08: There is already a conflict with very large programs |
| 128 | in the mega128. The mega128 has 128K instruction bytes (64K words), |
| 129 | thus the Most Significant Bit is 0x10000 which gets masked off my |
| 130 | AVR_MEM_MASK. |
| 131 | |
| 132 | The problem manifests itself when trying to set a breakpoint in a |
| 133 | function which resides in the upper half of the instruction space and |
| 134 | thus requires a 17-bit address. |
| 135 | |
| 136 | For now, I've just removed the EEPROM mask and changed AVR_MEM_MASK |
| 137 | from 0x00ff0000 to 0x00f00000. Eeprom is not accessible from gdb yet, |
| 138 | but could be for some remote targets by just adding the correct offset |
| 139 | to the address and letting the remote target handle the low-level |
| 140 | details of actually accessing the eeprom. */ |
| 141 | |
| 142 | AVR_IMEM_START = 0x00000000, /* INSN memory */ |
| 143 | AVR_SMEM_START = 0x00800000, /* SRAM memory */ |
| 144 | #if 1 |
| 145 | /* No eeprom mask defined */ |
| 146 | AVR_MEM_MASK = 0x00f00000, /* mask to determine memory space */ |
| 147 | #else |
| 148 | AVR_EMEM_START = 0x00810000, /* EEPROM memory */ |
| 149 | AVR_MEM_MASK = 0x00ff0000, /* mask to determine memory space */ |
| 150 | #endif |
| 151 | }; |
| 152 | |
| 153 | /* Prologue types: |
| 154 | |
| 155 | NORMAL and CALL are the typical types (the -mcall-prologues gcc option |
| 156 | causes the generation of the CALL type prologues). */ |
| 157 | |
| 158 | enum { |
| 159 | AVR_PROLOGUE_NONE, /* No prologue */ |
| 160 | AVR_PROLOGUE_NORMAL, |
| 161 | AVR_PROLOGUE_CALL, /* -mcall-prologues */ |
| 162 | AVR_PROLOGUE_MAIN, |
| 163 | AVR_PROLOGUE_INTR, /* interrupt handler */ |
| 164 | AVR_PROLOGUE_SIG, /* signal handler */ |
| 165 | }; |
| 166 | |
| 167 | /* Any function with a frame looks like this |
| 168 | ....... <-SP POINTS HERE |
| 169 | LOCALS1 <-FP POINTS HERE |
| 170 | LOCALS0 |
| 171 | SAVED FP |
| 172 | SAVED R3 |
| 173 | SAVED R2 |
| 174 | RET PC |
| 175 | FIRST ARG |
| 176 | SECOND ARG */ |
| 177 | |
| 178 | struct avr_unwind_cache |
| 179 | { |
| 180 | /* The previous frame's inner most stack address. Used as this |
| 181 | frame ID's stack_addr. */ |
| 182 | CORE_ADDR prev_sp; |
| 183 | /* The frame's base, optionally used by the high-level debug info. */ |
| 184 | CORE_ADDR base; |
| 185 | int size; |
| 186 | int prologue_type; |
| 187 | /* Table indicating the location of each and every register. */ |
| 188 | struct trad_frame_saved_reg *saved_regs; |
| 189 | }; |
| 190 | |
| 191 | struct gdbarch_tdep |
| 192 | { |
| 193 | /* Number of bytes stored to the stack by call instructions. |
| 194 | 2 bytes for avr1-5 and avrxmega1-5, 3 bytes for avr6 and avrxmega6-7. */ |
| 195 | int call_length; |
| 196 | |
| 197 | /* Type for void. */ |
| 198 | struct type *void_type; |
| 199 | /* Type for a function returning void. */ |
| 200 | struct type *func_void_type; |
| 201 | /* Type for a pointer to a function. Used for the type of PC. */ |
| 202 | struct type *pc_type; |
| 203 | }; |
| 204 | |
| 205 | /* Lookup the name of a register given it's number. */ |
| 206 | |
| 207 | static const char * |
| 208 | avr_register_name (struct gdbarch *gdbarch, int regnum) |
| 209 | { |
| 210 | static const char * const register_names[] = { |
| 211 | "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", |
| 212 | "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15", |
| 213 | "r16", "r17", "r18", "r19", "r20", "r21", "r22", "r23", |
| 214 | "r24", "r25", "r26", "r27", "r28", "r29", "r30", "r31", |
| 215 | "SREG", "SP", "PC2", |
| 216 | "pc" |
| 217 | }; |
| 218 | if (regnum < 0) |
| 219 | return NULL; |
| 220 | if (regnum >= (sizeof (register_names) / sizeof (*register_names))) |
| 221 | return NULL; |
| 222 | return register_names[regnum]; |
| 223 | } |
| 224 | |
| 225 | /* Return the GDB type object for the "standard" data type |
| 226 | of data in register N. */ |
| 227 | |
| 228 | static struct type * |
| 229 | avr_register_type (struct gdbarch *gdbarch, int reg_nr) |
| 230 | { |
| 231 | if (reg_nr == AVR_PC_REGNUM) |
| 232 | return builtin_type (gdbarch)->builtin_uint32; |
| 233 | if (reg_nr == AVR_PSEUDO_PC_REGNUM) |
| 234 | return gdbarch_tdep (gdbarch)->pc_type; |
| 235 | if (reg_nr == AVR_SP_REGNUM) |
| 236 | return builtin_type (gdbarch)->builtin_data_ptr; |
| 237 | return builtin_type (gdbarch)->builtin_uint8; |
| 238 | } |
| 239 | |
| 240 | /* Instruction address checks and convertions. */ |
| 241 | |
| 242 | static CORE_ADDR |
| 243 | avr_make_iaddr (CORE_ADDR x) |
| 244 | { |
| 245 | return ((x) | AVR_IMEM_START); |
| 246 | } |
| 247 | |
| 248 | /* FIXME: TRoth: Really need to use a larger mask for instructions. Some |
| 249 | devices are already up to 128KBytes of flash space. |
| 250 | |
| 251 | TRoth/2002-04-8: See comment above where AVR_IMEM_START is defined. */ |
| 252 | |
| 253 | static CORE_ADDR |
| 254 | avr_convert_iaddr_to_raw (CORE_ADDR x) |
| 255 | { |
| 256 | return ((x) & 0xffffffff); |
| 257 | } |
| 258 | |
| 259 | /* SRAM address checks and convertions. */ |
| 260 | |
| 261 | static CORE_ADDR |
| 262 | avr_make_saddr (CORE_ADDR x) |
| 263 | { |
| 264 | /* Return 0 for NULL. */ |
| 265 | if (x == 0) |
| 266 | return 0; |
| 267 | |
| 268 | return ((x) | AVR_SMEM_START); |
| 269 | } |
| 270 | |
| 271 | static CORE_ADDR |
| 272 | avr_convert_saddr_to_raw (CORE_ADDR x) |
| 273 | { |
| 274 | return ((x) & 0xffffffff); |
| 275 | } |
| 276 | |
| 277 | /* EEPROM address checks and convertions. I don't know if these will ever |
| 278 | actually be used, but I've added them just the same. TRoth */ |
| 279 | |
| 280 | /* TRoth/2002-04-08: Commented out for now to allow fix for problem with large |
| 281 | programs in the mega128. */ |
| 282 | |
| 283 | /* static CORE_ADDR */ |
| 284 | /* avr_make_eaddr (CORE_ADDR x) */ |
| 285 | /* { */ |
| 286 | /* return ((x) | AVR_EMEM_START); */ |
| 287 | /* } */ |
| 288 | |
| 289 | /* static int */ |
| 290 | /* avr_eaddr_p (CORE_ADDR x) */ |
| 291 | /* { */ |
| 292 | /* return (((x) & AVR_MEM_MASK) == AVR_EMEM_START); */ |
| 293 | /* } */ |
| 294 | |
| 295 | /* static CORE_ADDR */ |
| 296 | /* avr_convert_eaddr_to_raw (CORE_ADDR x) */ |
| 297 | /* { */ |
| 298 | /* return ((x) & 0xffffffff); */ |
| 299 | /* } */ |
| 300 | |
| 301 | /* Convert from address to pointer and vice-versa. */ |
| 302 | |
| 303 | static void |
| 304 | avr_address_to_pointer (struct gdbarch *gdbarch, |
| 305 | struct type *type, gdb_byte *buf, CORE_ADDR addr) |
| 306 | { |
| 307 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
| 308 | |
| 309 | /* Is it a data address in flash? */ |
| 310 | if (AVR_TYPE_ADDRESS_CLASS_FLASH (type)) |
| 311 | { |
| 312 | /* A data pointer in flash is byte addressed. */ |
| 313 | store_unsigned_integer (buf, TYPE_LENGTH (type), byte_order, |
| 314 | avr_convert_iaddr_to_raw (addr)); |
| 315 | } |
| 316 | /* Is it a code address? */ |
| 317 | else if (TYPE_CODE (TYPE_TARGET_TYPE (type)) == TYPE_CODE_FUNC |
| 318 | || TYPE_CODE (TYPE_TARGET_TYPE (type)) == TYPE_CODE_METHOD) |
| 319 | { |
| 320 | /* A code pointer is word (16 bits) addressed. We shift the address down |
| 321 | by 1 bit to convert it to a pointer. */ |
| 322 | store_unsigned_integer (buf, TYPE_LENGTH (type), byte_order, |
| 323 | avr_convert_iaddr_to_raw (addr >> 1)); |
| 324 | } |
| 325 | else |
| 326 | { |
| 327 | /* Strip off any upper segment bits. */ |
| 328 | store_unsigned_integer (buf, TYPE_LENGTH (type), byte_order, |
| 329 | avr_convert_saddr_to_raw (addr)); |
| 330 | } |
| 331 | } |
| 332 | |
| 333 | static CORE_ADDR |
| 334 | avr_pointer_to_address (struct gdbarch *gdbarch, |
| 335 | struct type *type, const gdb_byte *buf) |
| 336 | { |
| 337 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
| 338 | CORE_ADDR addr |
| 339 | = extract_unsigned_integer (buf, TYPE_LENGTH (type), byte_order); |
| 340 | |
| 341 | /* Is it a data address in flash? */ |
| 342 | if (AVR_TYPE_ADDRESS_CLASS_FLASH (type)) |
| 343 | { |
| 344 | /* A data pointer in flash is already byte addressed. */ |
| 345 | return avr_make_iaddr (addr); |
| 346 | } |
| 347 | /* Is it a code address? */ |
| 348 | else if (TYPE_CODE (TYPE_TARGET_TYPE (type)) == TYPE_CODE_FUNC |
| 349 | || TYPE_CODE (TYPE_TARGET_TYPE (type)) == TYPE_CODE_METHOD |
| 350 | || TYPE_CODE_SPACE (TYPE_TARGET_TYPE (type))) |
| 351 | { |
| 352 | /* A code pointer is word (16 bits) addressed so we shift it up |
| 353 | by 1 bit to convert it to an address. */ |
| 354 | return avr_make_iaddr (addr << 1); |
| 355 | } |
| 356 | else |
| 357 | return avr_make_saddr (addr); |
| 358 | } |
| 359 | |
| 360 | static CORE_ADDR |
| 361 | avr_integer_to_address (struct gdbarch *gdbarch, |
| 362 | struct type *type, const gdb_byte *buf) |
| 363 | { |
| 364 | ULONGEST addr = unpack_long (type, buf); |
| 365 | |
| 366 | return avr_make_saddr (addr); |
| 367 | } |
| 368 | |
| 369 | static CORE_ADDR |
| 370 | avr_read_pc (struct regcache *regcache) |
| 371 | { |
| 372 | ULONGEST pc; |
| 373 | regcache_cooked_read_unsigned (regcache, AVR_PC_REGNUM, &pc); |
| 374 | return avr_make_iaddr (pc); |
| 375 | } |
| 376 | |
| 377 | static void |
| 378 | avr_write_pc (struct regcache *regcache, CORE_ADDR val) |
| 379 | { |
| 380 | regcache_cooked_write_unsigned (regcache, AVR_PC_REGNUM, |
| 381 | avr_convert_iaddr_to_raw (val)); |
| 382 | } |
| 383 | |
| 384 | static enum register_status |
| 385 | avr_pseudo_register_read (struct gdbarch *gdbarch, struct regcache *regcache, |
| 386 | int regnum, gdb_byte *buf) |
| 387 | { |
| 388 | ULONGEST val; |
| 389 | enum register_status status; |
| 390 | |
| 391 | switch (regnum) |
| 392 | { |
| 393 | case AVR_PSEUDO_PC_REGNUM: |
| 394 | status = regcache_raw_read_unsigned (regcache, AVR_PC_REGNUM, &val); |
| 395 | if (status != REG_VALID) |
| 396 | return status; |
| 397 | val >>= 1; |
| 398 | store_unsigned_integer (buf, 4, gdbarch_byte_order (gdbarch), val); |
| 399 | return status; |
| 400 | default: |
| 401 | internal_error (__FILE__, __LINE__, _("invalid regnum")); |
| 402 | } |
| 403 | } |
| 404 | |
| 405 | static void |
| 406 | avr_pseudo_register_write (struct gdbarch *gdbarch, struct regcache *regcache, |
| 407 | int regnum, const gdb_byte *buf) |
| 408 | { |
| 409 | ULONGEST val; |
| 410 | |
| 411 | switch (regnum) |
| 412 | { |
| 413 | case AVR_PSEUDO_PC_REGNUM: |
| 414 | val = extract_unsigned_integer (buf, 4, gdbarch_byte_order (gdbarch)); |
| 415 | val <<= 1; |
| 416 | regcache_raw_write_unsigned (regcache, AVR_PC_REGNUM, val); |
| 417 | break; |
| 418 | default: |
| 419 | internal_error (__FILE__, __LINE__, _("invalid regnum")); |
| 420 | } |
| 421 | } |
| 422 | |
| 423 | /* Function: avr_scan_prologue |
| 424 | |
| 425 | This function decodes an AVR function prologue to determine: |
| 426 | 1) the size of the stack frame |
| 427 | 2) which registers are saved on it |
| 428 | 3) the offsets of saved regs |
| 429 | This information is stored in the avr_unwind_cache structure. |
| 430 | |
| 431 | Some devices lack the sbiw instruction, so on those replace this: |
| 432 | sbiw r28, XX |
| 433 | with this: |
| 434 | subi r28,lo8(XX) |
| 435 | sbci r29,hi8(XX) |
| 436 | |
| 437 | A typical AVR function prologue with a frame pointer might look like this: |
| 438 | push rXX ; saved regs |
| 439 | ... |
| 440 | push r28 |
| 441 | push r29 |
| 442 | in r28,__SP_L__ |
| 443 | in r29,__SP_H__ |
| 444 | sbiw r28,<LOCALS_SIZE> |
| 445 | in __tmp_reg__,__SREG__ |
| 446 | cli |
| 447 | out __SP_H__,r29 |
| 448 | out __SREG__,__tmp_reg__ |
| 449 | out __SP_L__,r28 |
| 450 | |
| 451 | A typical AVR function prologue without a frame pointer might look like |
| 452 | this: |
| 453 | push rXX ; saved regs |
| 454 | ... |
| 455 | |
| 456 | A main function prologue looks like this: |
| 457 | ldi r28,lo8(<RAM_ADDR> - <LOCALS_SIZE>) |
| 458 | ldi r29,hi8(<RAM_ADDR> - <LOCALS_SIZE>) |
| 459 | out __SP_H__,r29 |
| 460 | out __SP_L__,r28 |
| 461 | |
| 462 | A signal handler prologue looks like this: |
| 463 | push __zero_reg__ |
| 464 | push __tmp_reg__ |
| 465 | in __tmp_reg__, __SREG__ |
| 466 | push __tmp_reg__ |
| 467 | clr __zero_reg__ |
| 468 | push rXX ; save registers r18:r27, r30:r31 |
| 469 | ... |
| 470 | push r28 ; save frame pointer |
| 471 | push r29 |
| 472 | in r28, __SP_L__ |
| 473 | in r29, __SP_H__ |
| 474 | sbiw r28, <LOCALS_SIZE> |
| 475 | out __SP_H__, r29 |
| 476 | out __SP_L__, r28 |
| 477 | |
| 478 | A interrupt handler prologue looks like this: |
| 479 | sei |
| 480 | push __zero_reg__ |
| 481 | push __tmp_reg__ |
| 482 | in __tmp_reg__, __SREG__ |
| 483 | push __tmp_reg__ |
| 484 | clr __zero_reg__ |
| 485 | push rXX ; save registers r18:r27, r30:r31 |
| 486 | ... |
| 487 | push r28 ; save frame pointer |
| 488 | push r29 |
| 489 | in r28, __SP_L__ |
| 490 | in r29, __SP_H__ |
| 491 | sbiw r28, <LOCALS_SIZE> |
| 492 | cli |
| 493 | out __SP_H__, r29 |
| 494 | sei |
| 495 | out __SP_L__, r28 |
| 496 | |
| 497 | A `-mcall-prologues' prologue looks like this (Note that the megas use a |
| 498 | jmp instead of a rjmp, thus the prologue is one word larger since jmp is a |
| 499 | 32 bit insn and rjmp is a 16 bit insn): |
| 500 | ldi r26,lo8(<LOCALS_SIZE>) |
| 501 | ldi r27,hi8(<LOCALS_SIZE>) |
| 502 | ldi r30,pm_lo8(.L_foo_body) |
| 503 | ldi r31,pm_hi8(.L_foo_body) |
| 504 | rjmp __prologue_saves__+RRR |
| 505 | .L_foo_body: */ |
| 506 | |
| 507 | /* Not really part of a prologue, but still need to scan for it, is when a |
| 508 | function prologue moves values passed via registers as arguments to new |
| 509 | registers. In this case, all local variables live in registers, so there |
| 510 | may be some register saves. This is what it looks like: |
| 511 | movw rMM, rNN |
| 512 | ... |
| 513 | |
| 514 | There could be multiple movw's. If the target doesn't have a movw insn, it |
| 515 | will use two mov insns. This could be done after any of the above prologue |
| 516 | types. */ |
| 517 | |
| 518 | static CORE_ADDR |
| 519 | avr_scan_prologue (struct gdbarch *gdbarch, CORE_ADDR pc_beg, CORE_ADDR pc_end, |
| 520 | struct avr_unwind_cache *info) |
| 521 | { |
| 522 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
| 523 | int i; |
| 524 | unsigned short insn; |
| 525 | int scan_stage = 0; |
| 526 | struct bound_minimal_symbol msymbol; |
| 527 | unsigned char prologue[AVR_MAX_PROLOGUE_SIZE]; |
| 528 | int vpc = 0; |
| 529 | int len; |
| 530 | |
| 531 | len = pc_end - pc_beg; |
| 532 | if (len > AVR_MAX_PROLOGUE_SIZE) |
| 533 | len = AVR_MAX_PROLOGUE_SIZE; |
| 534 | |
| 535 | /* FIXME: TRoth/2003-06-11: This could be made more efficient by only |
| 536 | reading in the bytes of the prologue. The problem is that the figuring |
| 537 | out where the end of the prologue is is a bit difficult. The old code |
| 538 | tried to do that, but failed quite often. */ |
| 539 | read_memory (pc_beg, prologue, len); |
| 540 | |
| 541 | /* Scanning main()'s prologue |
| 542 | ldi r28,lo8(<RAM_ADDR> - <LOCALS_SIZE>) |
| 543 | ldi r29,hi8(<RAM_ADDR> - <LOCALS_SIZE>) |
| 544 | out __SP_H__,r29 |
| 545 | out __SP_L__,r28 */ |
| 546 | |
| 547 | if (len >= 4) |
| 548 | { |
| 549 | CORE_ADDR locals; |
| 550 | static const unsigned char img[] = { |
| 551 | 0xde, 0xbf, /* out __SP_H__,r29 */ |
| 552 | 0xcd, 0xbf /* out __SP_L__,r28 */ |
| 553 | }; |
| 554 | |
| 555 | insn = extract_unsigned_integer (&prologue[vpc], 2, byte_order); |
| 556 | /* ldi r28,lo8(<RAM_ADDR> - <LOCALS_SIZE>) */ |
| 557 | if ((insn & 0xf0f0) == 0xe0c0) |
| 558 | { |
| 559 | locals = (insn & 0xf) | ((insn & 0x0f00) >> 4); |
| 560 | insn = extract_unsigned_integer (&prologue[vpc + 2], 2, byte_order); |
| 561 | /* ldi r29,hi8(<RAM_ADDR> - <LOCALS_SIZE>) */ |
| 562 | if ((insn & 0xf0f0) == 0xe0d0) |
| 563 | { |
| 564 | locals |= ((insn & 0xf) | ((insn & 0x0f00) >> 4)) << 8; |
| 565 | if (vpc + 4 + sizeof (img) < len |
| 566 | && memcmp (prologue + vpc + 4, img, sizeof (img)) == 0) |
| 567 | { |
| 568 | info->prologue_type = AVR_PROLOGUE_MAIN; |
| 569 | info->base = locals; |
| 570 | return pc_beg + 4; |
| 571 | } |
| 572 | } |
| 573 | } |
| 574 | } |
| 575 | |
| 576 | /* Scanning `-mcall-prologues' prologue |
| 577 | Classic prologue is 10 bytes, mega prologue is a 12 bytes long */ |
| 578 | |
| 579 | while (1) /* Using a while to avoid many goto's */ |
| 580 | { |
| 581 | int loc_size; |
| 582 | int body_addr; |
| 583 | unsigned num_pushes; |
| 584 | int pc_offset = 0; |
| 585 | |
| 586 | /* At least the fifth instruction must have been executed to |
| 587 | modify frame shape. */ |
| 588 | if (len < 10) |
| 589 | break; |
| 590 | |
| 591 | insn = extract_unsigned_integer (&prologue[vpc], 2, byte_order); |
| 592 | /* ldi r26,<LOCALS_SIZE> */ |
| 593 | if ((insn & 0xf0f0) != 0xe0a0) |
| 594 | break; |
| 595 | loc_size = (insn & 0xf) | ((insn & 0x0f00) >> 4); |
| 596 | pc_offset += 2; |
| 597 | |
| 598 | insn = extract_unsigned_integer (&prologue[vpc + 2], 2, byte_order); |
| 599 | /* ldi r27,<LOCALS_SIZE> / 256 */ |
| 600 | if ((insn & 0xf0f0) != 0xe0b0) |
| 601 | break; |
| 602 | loc_size |= ((insn & 0xf) | ((insn & 0x0f00) >> 4)) << 8; |
| 603 | pc_offset += 2; |
| 604 | |
| 605 | insn = extract_unsigned_integer (&prologue[vpc + 4], 2, byte_order); |
| 606 | /* ldi r30,pm_lo8(.L_foo_body) */ |
| 607 | if ((insn & 0xf0f0) != 0xe0e0) |
| 608 | break; |
| 609 | body_addr = (insn & 0xf) | ((insn & 0x0f00) >> 4); |
| 610 | pc_offset += 2; |
| 611 | |
| 612 | insn = extract_unsigned_integer (&prologue[vpc + 6], 2, byte_order); |
| 613 | /* ldi r31,pm_hi8(.L_foo_body) */ |
| 614 | if ((insn & 0xf0f0) != 0xe0f0) |
| 615 | break; |
| 616 | body_addr |= ((insn & 0xf) | ((insn & 0x0f00) >> 4)) << 8; |
| 617 | pc_offset += 2; |
| 618 | |
| 619 | msymbol = lookup_minimal_symbol ("__prologue_saves__", NULL, NULL); |
| 620 | if (!msymbol.minsym) |
| 621 | break; |
| 622 | |
| 623 | insn = extract_unsigned_integer (&prologue[vpc + 8], 2, byte_order); |
| 624 | /* rjmp __prologue_saves__+RRR */ |
| 625 | if ((insn & 0xf000) == 0xc000) |
| 626 | { |
| 627 | /* Extract PC relative offset from RJMP */ |
| 628 | i = (insn & 0xfff) | (insn & 0x800 ? (-1 ^ 0xfff) : 0); |
| 629 | /* Convert offset to byte addressable mode */ |
| 630 | i *= 2; |
| 631 | /* Destination address */ |
| 632 | i += pc_beg + 10; |
| 633 | |
| 634 | if (body_addr != (pc_beg + 10)/2) |
| 635 | break; |
| 636 | |
| 637 | pc_offset += 2; |
| 638 | } |
| 639 | else if ((insn & 0xfe0e) == 0x940c) |
| 640 | { |
| 641 | /* Extract absolute PC address from JMP */ |
| 642 | i = (((insn & 0x1) | ((insn & 0x1f0) >> 3) << 16) |
| 643 | | (extract_unsigned_integer (&prologue[vpc + 10], 2, byte_order) |
| 644 | & 0xffff)); |
| 645 | /* Convert address to byte addressable mode */ |
| 646 | i *= 2; |
| 647 | |
| 648 | if (body_addr != (pc_beg + 12)/2) |
| 649 | break; |
| 650 | |
| 651 | pc_offset += 4; |
| 652 | } |
| 653 | else |
| 654 | break; |
| 655 | |
| 656 | /* Resolve offset (in words) from __prologue_saves__ symbol. |
| 657 | Which is a pushes count in `-mcall-prologues' mode */ |
| 658 | num_pushes = AVR_MAX_PUSHES - (i - BMSYMBOL_VALUE_ADDRESS (msymbol)) / 2; |
| 659 | |
| 660 | if (num_pushes > AVR_MAX_PUSHES) |
| 661 | { |
| 662 | fprintf_unfiltered (gdb_stderr, _("Num pushes too large: %d\n"), |
| 663 | num_pushes); |
| 664 | num_pushes = 0; |
| 665 | } |
| 666 | |
| 667 | if (num_pushes) |
| 668 | { |
| 669 | int from; |
| 670 | |
| 671 | info->saved_regs[AVR_FP_REGNUM + 1].addr = num_pushes; |
| 672 | if (num_pushes >= 2) |
| 673 | info->saved_regs[AVR_FP_REGNUM].addr = num_pushes - 1; |
| 674 | |
| 675 | i = 0; |
| 676 | for (from = AVR_LAST_PUSHED_REGNUM + 1 - (num_pushes - 2); |
| 677 | from <= AVR_LAST_PUSHED_REGNUM; ++from) |
| 678 | info->saved_regs [from].addr = ++i; |
| 679 | } |
| 680 | info->size = loc_size + num_pushes; |
| 681 | info->prologue_type = AVR_PROLOGUE_CALL; |
| 682 | |
| 683 | return pc_beg + pc_offset; |
| 684 | } |
| 685 | |
| 686 | /* Scan for the beginning of the prologue for an interrupt or signal |
| 687 | function. Note that we have to set the prologue type here since the |
| 688 | third stage of the prologue may not be present (e.g. no saved registered |
| 689 | or changing of the SP register). */ |
| 690 | |
| 691 | if (1) |
| 692 | { |
| 693 | static const unsigned char img[] = { |
| 694 | 0x78, 0x94, /* sei */ |
| 695 | 0x1f, 0x92, /* push r1 */ |
| 696 | 0x0f, 0x92, /* push r0 */ |
| 697 | 0x0f, 0xb6, /* in r0,0x3f SREG */ |
| 698 | 0x0f, 0x92, /* push r0 */ |
| 699 | 0x11, 0x24 /* clr r1 */ |
| 700 | }; |
| 701 | if (len >= sizeof (img) |
| 702 | && memcmp (prologue, img, sizeof (img)) == 0) |
| 703 | { |
| 704 | info->prologue_type = AVR_PROLOGUE_INTR; |
| 705 | vpc += sizeof (img); |
| 706 | info->saved_regs[AVR_SREG_REGNUM].addr = 3; |
| 707 | info->saved_regs[0].addr = 2; |
| 708 | info->saved_regs[1].addr = 1; |
| 709 | info->size += 3; |
| 710 | } |
| 711 | else if (len >= sizeof (img) - 2 |
| 712 | && memcmp (img + 2, prologue, sizeof (img) - 2) == 0) |
| 713 | { |
| 714 | info->prologue_type = AVR_PROLOGUE_SIG; |
| 715 | vpc += sizeof (img) - 2; |
| 716 | info->saved_regs[AVR_SREG_REGNUM].addr = 3; |
| 717 | info->saved_regs[0].addr = 2; |
| 718 | info->saved_regs[1].addr = 1; |
| 719 | info->size += 2; |
| 720 | } |
| 721 | } |
| 722 | |
| 723 | /* First stage of the prologue scanning. |
| 724 | Scan pushes (saved registers) */ |
| 725 | |
| 726 | for (; vpc < len; vpc += 2) |
| 727 | { |
| 728 | insn = extract_unsigned_integer (&prologue[vpc], 2, byte_order); |
| 729 | if ((insn & 0xfe0f) == 0x920f) /* push rXX */ |
| 730 | { |
| 731 | /* Bits 4-9 contain a mask for registers R0-R32. */ |
| 732 | int regno = (insn & 0x1f0) >> 4; |
| 733 | info->size++; |
| 734 | info->saved_regs[regno].addr = info->size; |
| 735 | scan_stage = 1; |
| 736 | } |
| 737 | else |
| 738 | break; |
| 739 | } |
| 740 | |
| 741 | gdb_assert (vpc < AVR_MAX_PROLOGUE_SIZE); |
| 742 | |
| 743 | /* Handle static small stack allocation using rcall or push. */ |
| 744 | |
| 745 | while (scan_stage == 1 && vpc < len) |
| 746 | { |
| 747 | insn = extract_unsigned_integer (&prologue[vpc], 2, byte_order); |
| 748 | if (insn == 0xd000) /* rcall .+0 */ |
| 749 | { |
| 750 | info->size += gdbarch_tdep (gdbarch)->call_length; |
| 751 | vpc += 2; |
| 752 | } |
| 753 | else if (insn == 0x920f || insn == 0x921f) /* push r0 or push r1 */ |
| 754 | { |
| 755 | info->size += 1; |
| 756 | vpc += 2; |
| 757 | } |
| 758 | else |
| 759 | break; |
| 760 | } |
| 761 | |
| 762 | /* Second stage of the prologue scanning. |
| 763 | Scan: |
| 764 | in r28,__SP_L__ |
| 765 | in r29,__SP_H__ */ |
| 766 | |
| 767 | if (scan_stage == 1 && vpc < len) |
| 768 | { |
| 769 | static const unsigned char img[] = { |
| 770 | 0xcd, 0xb7, /* in r28,__SP_L__ */ |
| 771 | 0xde, 0xb7 /* in r29,__SP_H__ */ |
| 772 | }; |
| 773 | |
| 774 | if (vpc + sizeof (img) < len |
| 775 | && memcmp (prologue + vpc, img, sizeof (img)) == 0) |
| 776 | { |
| 777 | vpc += 4; |
| 778 | scan_stage = 2; |
| 779 | } |
| 780 | } |
| 781 | |
| 782 | /* Third stage of the prologue scanning. (Really two stages). |
| 783 | Scan for: |
| 784 | sbiw r28,XX or subi r28,lo8(XX) |
| 785 | sbci r29,hi8(XX) |
| 786 | in __tmp_reg__,__SREG__ |
| 787 | cli |
| 788 | out __SP_H__,r29 |
| 789 | out __SREG__,__tmp_reg__ |
| 790 | out __SP_L__,r28 */ |
| 791 | |
| 792 | if (scan_stage == 2 && vpc < len) |
| 793 | { |
| 794 | int locals_size = 0; |
| 795 | static const unsigned char img[] = { |
| 796 | 0x0f, 0xb6, /* in r0,0x3f */ |
| 797 | 0xf8, 0x94, /* cli */ |
| 798 | 0xde, 0xbf, /* out 0x3e,r29 ; SPH */ |
| 799 | 0x0f, 0xbe, /* out 0x3f,r0 ; SREG */ |
| 800 | 0xcd, 0xbf /* out 0x3d,r28 ; SPL */ |
| 801 | }; |
| 802 | static const unsigned char img_sig[] = { |
| 803 | 0xde, 0xbf, /* out 0x3e,r29 ; SPH */ |
| 804 | 0xcd, 0xbf /* out 0x3d,r28 ; SPL */ |
| 805 | }; |
| 806 | static const unsigned char img_int[] = { |
| 807 | 0xf8, 0x94, /* cli */ |
| 808 | 0xde, 0xbf, /* out 0x3e,r29 ; SPH */ |
| 809 | 0x78, 0x94, /* sei */ |
| 810 | 0xcd, 0xbf /* out 0x3d,r28 ; SPL */ |
| 811 | }; |
| 812 | |
| 813 | insn = extract_unsigned_integer (&prologue[vpc], 2, byte_order); |
| 814 | if ((insn & 0xff30) == 0x9720) /* sbiw r28,XXX */ |
| 815 | { |
| 816 | locals_size = (insn & 0xf) | ((insn & 0xc0) >> 2); |
| 817 | vpc += 2; |
| 818 | } |
| 819 | else if ((insn & 0xf0f0) == 0x50c0) /* subi r28,lo8(XX) */ |
| 820 | { |
| 821 | locals_size = (insn & 0xf) | ((insn & 0xf00) >> 4); |
| 822 | vpc += 2; |
| 823 | insn = extract_unsigned_integer (&prologue[vpc], 2, byte_order); |
| 824 | vpc += 2; |
| 825 | locals_size += ((insn & 0xf) | ((insn & 0xf00) >> 4)) << 8; |
| 826 | } |
| 827 | else |
| 828 | return pc_beg + vpc; |
| 829 | |
| 830 | /* Scan the last part of the prologue. May not be present for interrupt |
| 831 | or signal handler functions, which is why we set the prologue type |
| 832 | when we saw the beginning of the prologue previously. */ |
| 833 | |
| 834 | if (vpc + sizeof (img_sig) < len |
| 835 | && memcmp (prologue + vpc, img_sig, sizeof (img_sig)) == 0) |
| 836 | { |
| 837 | vpc += sizeof (img_sig); |
| 838 | } |
| 839 | else if (vpc + sizeof (img_int) < len |
| 840 | && memcmp (prologue + vpc, img_int, sizeof (img_int)) == 0) |
| 841 | { |
| 842 | vpc += sizeof (img_int); |
| 843 | } |
| 844 | if (vpc + sizeof (img) < len |
| 845 | && memcmp (prologue + vpc, img, sizeof (img)) == 0) |
| 846 | { |
| 847 | info->prologue_type = AVR_PROLOGUE_NORMAL; |
| 848 | vpc += sizeof (img); |
| 849 | } |
| 850 | |
| 851 | info->size += locals_size; |
| 852 | |
| 853 | /* Fall through. */ |
| 854 | } |
| 855 | |
| 856 | /* If we got this far, we could not scan the prologue, so just return the pc |
| 857 | of the frame plus an adjustment for argument move insns. */ |
| 858 | |
| 859 | for (; vpc < len; vpc += 2) |
| 860 | { |
| 861 | insn = extract_unsigned_integer (&prologue[vpc], 2, byte_order); |
| 862 | if ((insn & 0xff00) == 0x0100) /* movw rXX, rYY */ |
| 863 | continue; |
| 864 | else if ((insn & 0xfc00) == 0x2c00) /* mov rXX, rYY */ |
| 865 | continue; |
| 866 | else |
| 867 | break; |
| 868 | } |
| 869 | |
| 870 | return pc_beg + vpc; |
| 871 | } |
| 872 | |
| 873 | static CORE_ADDR |
| 874 | avr_skip_prologue (struct gdbarch *gdbarch, CORE_ADDR pc) |
| 875 | { |
| 876 | CORE_ADDR func_addr, func_end; |
| 877 | CORE_ADDR post_prologue_pc; |
| 878 | |
| 879 | /* See what the symbol table says */ |
| 880 | |
| 881 | if (!find_pc_partial_function (pc, NULL, &func_addr, &func_end)) |
| 882 | return pc; |
| 883 | |
| 884 | post_prologue_pc = skip_prologue_using_sal (gdbarch, func_addr); |
| 885 | if (post_prologue_pc != 0) |
| 886 | return std::max (pc, post_prologue_pc); |
| 887 | |
| 888 | { |
| 889 | CORE_ADDR prologue_end = pc; |
| 890 | struct avr_unwind_cache info = {0}; |
| 891 | struct trad_frame_saved_reg saved_regs[AVR_NUM_REGS]; |
| 892 | |
| 893 | info.saved_regs = saved_regs; |
| 894 | |
| 895 | /* Need to run the prologue scanner to figure out if the function has a |
| 896 | prologue and possibly skip over moving arguments passed via registers |
| 897 | to other registers. */ |
| 898 | |
| 899 | prologue_end = avr_scan_prologue (gdbarch, func_addr, func_end, &info); |
| 900 | |
| 901 | if (info.prologue_type != AVR_PROLOGUE_NONE) |
| 902 | return prologue_end; |
| 903 | } |
| 904 | |
| 905 | /* Either we didn't find the start of this function (nothing we can do), |
| 906 | or there's no line info, or the line after the prologue is after |
| 907 | the end of the function (there probably isn't a prologue). */ |
| 908 | |
| 909 | return pc; |
| 910 | } |
| 911 | |
| 912 | /* Not all avr devices support the BREAK insn. Those that don't should treat |
| 913 | it as a NOP. Thus, it should be ok. Since the avr is currently a remote |
| 914 | only target, this shouldn't be a problem (I hope). TRoth/2003-05-14 */ |
| 915 | |
| 916 | constexpr gdb_byte avr_break_insn [] = { 0x98, 0x95 }; |
| 917 | |
| 918 | typedef BP_MANIPULATION (avr_break_insn) avr_breakpoint; |
| 919 | |
| 920 | /* Determine, for architecture GDBARCH, how a return value of TYPE |
| 921 | should be returned. If it is supposed to be returned in registers, |
| 922 | and READBUF is non-zero, read the appropriate value from REGCACHE, |
| 923 | and copy it into READBUF. If WRITEBUF is non-zero, write the value |
| 924 | from WRITEBUF into REGCACHE. */ |
| 925 | |
| 926 | static enum return_value_convention |
| 927 | avr_return_value (struct gdbarch *gdbarch, struct value *function, |
| 928 | struct type *valtype, struct regcache *regcache, |
| 929 | gdb_byte *readbuf, const gdb_byte *writebuf) |
| 930 | { |
| 931 | int i; |
| 932 | /* Single byte are returned in r24. |
| 933 | Otherwise, the MSB of the return value is always in r25, calculate which |
| 934 | register holds the LSB. */ |
| 935 | int lsb_reg; |
| 936 | |
| 937 | if ((TYPE_CODE (valtype) == TYPE_CODE_STRUCT |
| 938 | || TYPE_CODE (valtype) == TYPE_CODE_UNION |
| 939 | || TYPE_CODE (valtype) == TYPE_CODE_ARRAY) |
| 940 | && TYPE_LENGTH (valtype) > 8) |
| 941 | return RETURN_VALUE_STRUCT_CONVENTION; |
| 942 | |
| 943 | if (TYPE_LENGTH (valtype) <= 2) |
| 944 | lsb_reg = 24; |
| 945 | else if (TYPE_LENGTH (valtype) <= 4) |
| 946 | lsb_reg = 22; |
| 947 | else if (TYPE_LENGTH (valtype) <= 8) |
| 948 | lsb_reg = 18; |
| 949 | else |
| 950 | gdb_assert_not_reached ("unexpected type length"); |
| 951 | |
| 952 | if (writebuf != NULL) |
| 953 | { |
| 954 | for (i = 0; i < TYPE_LENGTH (valtype); i++) |
| 955 | regcache_cooked_write (regcache, lsb_reg + i, writebuf + i); |
| 956 | } |
| 957 | |
| 958 | if (readbuf != NULL) |
| 959 | { |
| 960 | for (i = 0; i < TYPE_LENGTH (valtype); i++) |
| 961 | regcache_cooked_read (regcache, lsb_reg + i, readbuf + i); |
| 962 | } |
| 963 | |
| 964 | return RETURN_VALUE_REGISTER_CONVENTION; |
| 965 | } |
| 966 | |
| 967 | |
| 968 | /* Put here the code to store, into fi->saved_regs, the addresses of |
| 969 | the saved registers of frame described by FRAME_INFO. This |
| 970 | includes special registers such as pc and fp saved in special ways |
| 971 | in the stack frame. sp is even more special: the address we return |
| 972 | for it IS the sp for the next frame. */ |
| 973 | |
| 974 | static struct avr_unwind_cache * |
| 975 | avr_frame_unwind_cache (struct frame_info *this_frame, |
| 976 | void **this_prologue_cache) |
| 977 | { |
| 978 | CORE_ADDR start_pc, current_pc; |
| 979 | ULONGEST prev_sp; |
| 980 | ULONGEST this_base; |
| 981 | struct avr_unwind_cache *info; |
| 982 | struct gdbarch *gdbarch; |
| 983 | struct gdbarch_tdep *tdep; |
| 984 | int i; |
| 985 | |
| 986 | if (*this_prologue_cache) |
| 987 | return (struct avr_unwind_cache *) *this_prologue_cache; |
| 988 | |
| 989 | info = FRAME_OBSTACK_ZALLOC (struct avr_unwind_cache); |
| 990 | *this_prologue_cache = info; |
| 991 | info->saved_regs = trad_frame_alloc_saved_regs (this_frame); |
| 992 | |
| 993 | info->size = 0; |
| 994 | info->prologue_type = AVR_PROLOGUE_NONE; |
| 995 | |
| 996 | start_pc = get_frame_func (this_frame); |
| 997 | current_pc = get_frame_pc (this_frame); |
| 998 | if ((start_pc > 0) && (start_pc <= current_pc)) |
| 999 | avr_scan_prologue (get_frame_arch (this_frame), |
| 1000 | start_pc, current_pc, info); |
| 1001 | |
| 1002 | if ((info->prologue_type != AVR_PROLOGUE_NONE) |
| 1003 | && (info->prologue_type != AVR_PROLOGUE_MAIN)) |
| 1004 | { |
| 1005 | ULONGEST high_base; /* High byte of FP */ |
| 1006 | |
| 1007 | /* The SP was moved to the FP. This indicates that a new frame |
| 1008 | was created. Get THIS frame's FP value by unwinding it from |
| 1009 | the next frame. */ |
| 1010 | this_base = get_frame_register_unsigned (this_frame, AVR_FP_REGNUM); |
| 1011 | high_base = get_frame_register_unsigned (this_frame, AVR_FP_REGNUM + 1); |
| 1012 | this_base += (high_base << 8); |
| 1013 | |
| 1014 | /* The FP points at the last saved register. Adjust the FP back |
| 1015 | to before the first saved register giving the SP. */ |
| 1016 | prev_sp = this_base + info->size; |
| 1017 | } |
| 1018 | else |
| 1019 | { |
| 1020 | /* Assume that the FP is this frame's SP but with that pushed |
| 1021 | stack space added back. */ |
| 1022 | this_base = get_frame_register_unsigned (this_frame, AVR_SP_REGNUM); |
| 1023 | prev_sp = this_base + info->size; |
| 1024 | } |
| 1025 | |
| 1026 | /* Add 1 here to adjust for the post-decrement nature of the push |
| 1027 | instruction.*/ |
| 1028 | info->prev_sp = avr_make_saddr (prev_sp + 1); |
| 1029 | info->base = avr_make_saddr (this_base); |
| 1030 | |
| 1031 | gdbarch = get_frame_arch (this_frame); |
| 1032 | |
| 1033 | /* Adjust all the saved registers so that they contain addresses and not |
| 1034 | offsets. */ |
| 1035 | for (i = 0; i < gdbarch_num_regs (gdbarch) - 1; i++) |
| 1036 | if (info->saved_regs[i].addr > 0) |
| 1037 | info->saved_regs[i].addr = info->prev_sp - info->saved_regs[i].addr; |
| 1038 | |
| 1039 | /* Except for the main and startup code, the return PC is always saved on |
| 1040 | the stack and is at the base of the frame. */ |
| 1041 | |
| 1042 | if (info->prologue_type != AVR_PROLOGUE_MAIN) |
| 1043 | info->saved_regs[AVR_PC_REGNUM].addr = info->prev_sp; |
| 1044 | |
| 1045 | /* The previous frame's SP needed to be computed. Save the computed |
| 1046 | value. */ |
| 1047 | tdep = gdbarch_tdep (gdbarch); |
| 1048 | trad_frame_set_value (info->saved_regs, AVR_SP_REGNUM, |
| 1049 | info->prev_sp - 1 + tdep->call_length); |
| 1050 | |
| 1051 | return info; |
| 1052 | } |
| 1053 | |
| 1054 | static CORE_ADDR |
| 1055 | avr_unwind_pc (struct gdbarch *gdbarch, struct frame_info *next_frame) |
| 1056 | { |
| 1057 | ULONGEST pc; |
| 1058 | |
| 1059 | pc = frame_unwind_register_unsigned (next_frame, AVR_PC_REGNUM); |
| 1060 | |
| 1061 | return avr_make_iaddr (pc); |
| 1062 | } |
| 1063 | |
| 1064 | static CORE_ADDR |
| 1065 | avr_unwind_sp (struct gdbarch *gdbarch, struct frame_info *next_frame) |
| 1066 | { |
| 1067 | ULONGEST sp; |
| 1068 | |
| 1069 | sp = frame_unwind_register_unsigned (next_frame, AVR_SP_REGNUM); |
| 1070 | |
| 1071 | return avr_make_saddr (sp); |
| 1072 | } |
| 1073 | |
| 1074 | /* Given a GDB frame, determine the address of the calling function's |
| 1075 | frame. This will be used to create a new GDB frame struct. */ |
| 1076 | |
| 1077 | static void |
| 1078 | avr_frame_this_id (struct frame_info *this_frame, |
| 1079 | void **this_prologue_cache, |
| 1080 | struct frame_id *this_id) |
| 1081 | { |
| 1082 | struct avr_unwind_cache *info |
| 1083 | = avr_frame_unwind_cache (this_frame, this_prologue_cache); |
| 1084 | CORE_ADDR base; |
| 1085 | CORE_ADDR func; |
| 1086 | struct frame_id id; |
| 1087 | |
| 1088 | /* The FUNC is easy. */ |
| 1089 | func = get_frame_func (this_frame); |
| 1090 | |
| 1091 | /* Hopefully the prologue analysis either correctly determined the |
| 1092 | frame's base (which is the SP from the previous frame), or set |
| 1093 | that base to "NULL". */ |
| 1094 | base = info->prev_sp; |
| 1095 | if (base == 0) |
| 1096 | return; |
| 1097 | |
| 1098 | id = frame_id_build (base, func); |
| 1099 | (*this_id) = id; |
| 1100 | } |
| 1101 | |
| 1102 | static struct value * |
| 1103 | avr_frame_prev_register (struct frame_info *this_frame, |
| 1104 | void **this_prologue_cache, int regnum) |
| 1105 | { |
| 1106 | struct avr_unwind_cache *info |
| 1107 | = avr_frame_unwind_cache (this_frame, this_prologue_cache); |
| 1108 | |
| 1109 | if (regnum == AVR_PC_REGNUM || regnum == AVR_PSEUDO_PC_REGNUM) |
| 1110 | { |
| 1111 | if (trad_frame_addr_p (info->saved_regs, AVR_PC_REGNUM)) |
| 1112 | { |
| 1113 | /* Reading the return PC from the PC register is slightly |
| 1114 | abnormal. register_size(AVR_PC_REGNUM) says it is 4 bytes, |
| 1115 | but in reality, only two bytes (3 in upcoming mega256) are |
| 1116 | stored on the stack. |
| 1117 | |
| 1118 | Also, note that the value on the stack is an addr to a word |
| 1119 | not a byte, so we will need to multiply it by two at some |
| 1120 | point. |
| 1121 | |
| 1122 | And to confuse matters even more, the return address stored |
| 1123 | on the stack is in big endian byte order, even though most |
| 1124 | everything else about the avr is little endian. Ick! */ |
| 1125 | ULONGEST pc; |
| 1126 | int i; |
| 1127 | gdb_byte buf[3]; |
| 1128 | struct gdbarch *gdbarch = get_frame_arch (this_frame); |
| 1129 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 1130 | |
| 1131 | read_memory (info->saved_regs[AVR_PC_REGNUM].addr, |
| 1132 | buf, tdep->call_length); |
| 1133 | |
| 1134 | /* Extract the PC read from memory as a big-endian. */ |
| 1135 | pc = 0; |
| 1136 | for (i = 0; i < tdep->call_length; i++) |
| 1137 | pc = (pc << 8) | buf[i]; |
| 1138 | |
| 1139 | if (regnum == AVR_PC_REGNUM) |
| 1140 | pc <<= 1; |
| 1141 | |
| 1142 | return frame_unwind_got_constant (this_frame, regnum, pc); |
| 1143 | } |
| 1144 | |
| 1145 | return frame_unwind_got_optimized (this_frame, regnum); |
| 1146 | } |
| 1147 | |
| 1148 | return trad_frame_get_prev_register (this_frame, info->saved_regs, regnum); |
| 1149 | } |
| 1150 | |
| 1151 | static const struct frame_unwind avr_frame_unwind = { |
| 1152 | NORMAL_FRAME, |
| 1153 | default_frame_unwind_stop_reason, |
| 1154 | avr_frame_this_id, |
| 1155 | avr_frame_prev_register, |
| 1156 | NULL, |
| 1157 | default_frame_sniffer |
| 1158 | }; |
| 1159 | |
| 1160 | static CORE_ADDR |
| 1161 | avr_frame_base_address (struct frame_info *this_frame, void **this_cache) |
| 1162 | { |
| 1163 | struct avr_unwind_cache *info |
| 1164 | = avr_frame_unwind_cache (this_frame, this_cache); |
| 1165 | |
| 1166 | return info->base; |
| 1167 | } |
| 1168 | |
| 1169 | static const struct frame_base avr_frame_base = { |
| 1170 | &avr_frame_unwind, |
| 1171 | avr_frame_base_address, |
| 1172 | avr_frame_base_address, |
| 1173 | avr_frame_base_address |
| 1174 | }; |
| 1175 | |
| 1176 | /* Assuming THIS_FRAME is a dummy, return the frame ID of that dummy |
| 1177 | frame. The frame ID's base needs to match the TOS value saved by |
| 1178 | save_dummy_frame_tos(), and the PC match the dummy frame's breakpoint. */ |
| 1179 | |
| 1180 | static struct frame_id |
| 1181 | avr_dummy_id (struct gdbarch *gdbarch, struct frame_info *this_frame) |
| 1182 | { |
| 1183 | ULONGEST base; |
| 1184 | |
| 1185 | base = get_frame_register_unsigned (this_frame, AVR_SP_REGNUM); |
| 1186 | return frame_id_build (avr_make_saddr (base), get_frame_pc (this_frame)); |
| 1187 | } |
| 1188 | |
| 1189 | /* When arguments must be pushed onto the stack, they go on in reverse |
| 1190 | order. The below implements a FILO (stack) to do this. */ |
| 1191 | |
| 1192 | struct stack_item |
| 1193 | { |
| 1194 | int len; |
| 1195 | struct stack_item *prev; |
| 1196 | gdb_byte *data; |
| 1197 | }; |
| 1198 | |
| 1199 | static struct stack_item * |
| 1200 | push_stack_item (struct stack_item *prev, const bfd_byte *contents, int len) |
| 1201 | { |
| 1202 | struct stack_item *si; |
| 1203 | si = XNEW (struct stack_item); |
| 1204 | si->data = (gdb_byte *) xmalloc (len); |
| 1205 | si->len = len; |
| 1206 | si->prev = prev; |
| 1207 | memcpy (si->data, contents, len); |
| 1208 | return si; |
| 1209 | } |
| 1210 | |
| 1211 | static struct stack_item *pop_stack_item (struct stack_item *si); |
| 1212 | static struct stack_item * |
| 1213 | pop_stack_item (struct stack_item *si) |
| 1214 | { |
| 1215 | struct stack_item *dead = si; |
| 1216 | si = si->prev; |
| 1217 | xfree (dead->data); |
| 1218 | xfree (dead); |
| 1219 | return si; |
| 1220 | } |
| 1221 | |
| 1222 | /* Setup the function arguments for calling a function in the inferior. |
| 1223 | |
| 1224 | On the AVR architecture, there are 18 registers (R25 to R8) which are |
| 1225 | dedicated for passing function arguments. Up to the first 18 arguments |
| 1226 | (depending on size) may go into these registers. The rest go on the stack. |
| 1227 | |
| 1228 | All arguments are aligned to start in even-numbered registers (odd-sized |
| 1229 | arguments, including char, have one free register above them). For example, |
| 1230 | an int in arg1 and a char in arg2 would be passed as such: |
| 1231 | |
| 1232 | arg1 -> r25:r24 |
| 1233 | arg2 -> r22 |
| 1234 | |
| 1235 | Arguments that are larger than 2 bytes will be split between two or more |
| 1236 | registers as available, but will NOT be split between a register and the |
| 1237 | stack. Arguments that go onto the stack are pushed last arg first (this is |
| 1238 | similar to the d10v). */ |
| 1239 | |
| 1240 | /* NOTE: TRoth/2003-06-17: The rest of this comment is old looks to be |
| 1241 | inaccurate. |
| 1242 | |
| 1243 | An exceptional case exists for struct arguments (and possibly other |
| 1244 | aggregates such as arrays) -- if the size is larger than WORDSIZE bytes but |
| 1245 | not a multiple of WORDSIZE bytes. In this case the argument is never split |
| 1246 | between the registers and the stack, but instead is copied in its entirety |
| 1247 | onto the stack, AND also copied into as many registers as there is room |
| 1248 | for. In other words, space in registers permitting, two copies of the same |
| 1249 | argument are passed in. As far as I can tell, only the one on the stack is |
| 1250 | used, although that may be a function of the level of compiler |
| 1251 | optimization. I suspect this is a compiler bug. Arguments of these odd |
| 1252 | sizes are left-justified within the word (as opposed to arguments smaller |
| 1253 | than WORDSIZE bytes, which are right-justified). |
| 1254 | |
| 1255 | If the function is to return an aggregate type such as a struct, the caller |
| 1256 | must allocate space into which the callee will copy the return value. In |
| 1257 | this case, a pointer to the return value location is passed into the callee |
| 1258 | in register R0, which displaces one of the other arguments passed in via |
| 1259 | registers R0 to R2. */ |
| 1260 | |
| 1261 | static CORE_ADDR |
| 1262 | avr_push_dummy_call (struct gdbarch *gdbarch, struct value *function, |
| 1263 | struct regcache *regcache, CORE_ADDR bp_addr, |
| 1264 | int nargs, struct value **args, CORE_ADDR sp, |
| 1265 | int struct_return, CORE_ADDR struct_addr) |
| 1266 | { |
| 1267 | int i; |
| 1268 | gdb_byte buf[3]; |
| 1269 | int call_length = gdbarch_tdep (gdbarch)->call_length; |
| 1270 | CORE_ADDR return_pc = avr_convert_iaddr_to_raw (bp_addr); |
| 1271 | int regnum = AVR_ARGN_REGNUM; |
| 1272 | struct stack_item *si = NULL; |
| 1273 | |
| 1274 | if (struct_return) |
| 1275 | { |
| 1276 | regcache_cooked_write_unsigned |
| 1277 | (regcache, regnum--, (struct_addr >> 8) & 0xff); |
| 1278 | regcache_cooked_write_unsigned |
| 1279 | (regcache, regnum--, struct_addr & 0xff); |
| 1280 | /* SP being post decremented, we need to reserve one byte so that the |
| 1281 | return address won't overwrite the result (or vice-versa). */ |
| 1282 | if (sp == struct_addr) |
| 1283 | sp--; |
| 1284 | } |
| 1285 | |
| 1286 | for (i = 0; i < nargs; i++) |
| 1287 | { |
| 1288 | int last_regnum; |
| 1289 | int j; |
| 1290 | struct value *arg = args[i]; |
| 1291 | struct type *type = check_typedef (value_type (arg)); |
| 1292 | const bfd_byte *contents = value_contents (arg); |
| 1293 | int len = TYPE_LENGTH (type); |
| 1294 | |
| 1295 | /* Calculate the potential last register needed. |
| 1296 | E.g. For length 2, registers regnum and regnum-1 (say 25 and 24) |
| 1297 | shall be used. So, last needed register will be regnum-1(24). */ |
| 1298 | last_regnum = regnum - (len + (len & 1)) + 1; |
| 1299 | |
| 1300 | /* If there are registers available, use them. Once we start putting |
| 1301 | stuff on the stack, all subsequent args go on stack. */ |
| 1302 | if ((si == NULL) && (last_regnum >= AVR_LAST_ARG_REGNUM)) |
| 1303 | { |
| 1304 | /* Skip a register for odd length args. */ |
| 1305 | if (len & 1) |
| 1306 | regnum--; |
| 1307 | |
| 1308 | /* Write MSB of argument into register and subsequent bytes in |
| 1309 | decreasing register numbers. */ |
| 1310 | for (j = 0; j < len; j++) |
| 1311 | regcache_cooked_write_unsigned |
| 1312 | (regcache, regnum--, contents[len - j - 1]); |
| 1313 | } |
| 1314 | /* No registers available, push the args onto the stack. */ |
| 1315 | else |
| 1316 | { |
| 1317 | /* From here on, we don't care about regnum. */ |
| 1318 | si = push_stack_item (si, contents, len); |
| 1319 | } |
| 1320 | } |
| 1321 | |
| 1322 | /* Push args onto the stack. */ |
| 1323 | while (si) |
| 1324 | { |
| 1325 | sp -= si->len; |
| 1326 | /* Add 1 to sp here to account for post decr nature of pushes. */ |
| 1327 | write_memory (sp + 1, si->data, si->len); |
| 1328 | si = pop_stack_item (si); |
| 1329 | } |
| 1330 | |
| 1331 | /* Set the return address. For the avr, the return address is the BP_ADDR. |
| 1332 | Need to push the return address onto the stack noting that it needs to be |
| 1333 | in big-endian order on the stack. */ |
| 1334 | for (i = 1; i <= call_length; i++) |
| 1335 | { |
| 1336 | buf[call_length - i] = return_pc & 0xff; |
| 1337 | return_pc >>= 8; |
| 1338 | } |
| 1339 | |
| 1340 | sp -= call_length; |
| 1341 | /* Use 'sp + 1' since pushes are post decr ops. */ |
| 1342 | write_memory (sp + 1, buf, call_length); |
| 1343 | |
| 1344 | /* Finally, update the SP register. */ |
| 1345 | regcache_cooked_write_unsigned (regcache, AVR_SP_REGNUM, |
| 1346 | avr_convert_saddr_to_raw (sp)); |
| 1347 | |
| 1348 | /* Return SP value for the dummy frame, where the return address hasn't been |
| 1349 | pushed. */ |
| 1350 | return sp + call_length; |
| 1351 | } |
| 1352 | |
| 1353 | /* Unfortunately dwarf2 register for SP is 32. */ |
| 1354 | |
| 1355 | static int |
| 1356 | avr_dwarf_reg_to_regnum (struct gdbarch *gdbarch, int reg) |
| 1357 | { |
| 1358 | if (reg >= 0 && reg < 32) |
| 1359 | return reg; |
| 1360 | if (reg == 32) |
| 1361 | return AVR_SP_REGNUM; |
| 1362 | return -1; |
| 1363 | } |
| 1364 | |
| 1365 | /* Implementation of `address_class_type_flags' gdbarch method. |
| 1366 | |
| 1367 | This method maps DW_AT_address_class attributes to a |
| 1368 | type_instance_flag_value. */ |
| 1369 | |
| 1370 | static int |
| 1371 | avr_address_class_type_flags (int byte_size, int dwarf2_addr_class) |
| 1372 | { |
| 1373 | /* The value 1 of the DW_AT_address_class attribute corresponds to the |
| 1374 | __flash qualifier. Note that this attribute is only valid with |
| 1375 | pointer types and therefore the flag is set to the pointer type and |
| 1376 | not its target type. */ |
| 1377 | if (dwarf2_addr_class == 1 && byte_size == 2) |
| 1378 | return AVR_TYPE_INSTANCE_FLAG_ADDRESS_CLASS_FLASH; |
| 1379 | return 0; |
| 1380 | } |
| 1381 | |
| 1382 | /* Implementation of `address_class_type_flags_to_name' gdbarch method. |
| 1383 | |
| 1384 | Convert a type_instance_flag_value to an address space qualifier. */ |
| 1385 | |
| 1386 | static const char* |
| 1387 | avr_address_class_type_flags_to_name (struct gdbarch *gdbarch, int type_flags) |
| 1388 | { |
| 1389 | if (type_flags & AVR_TYPE_INSTANCE_FLAG_ADDRESS_CLASS_FLASH) |
| 1390 | return "flash"; |
| 1391 | else |
| 1392 | return NULL; |
| 1393 | } |
| 1394 | |
| 1395 | /* Implementation of `address_class_name_to_type_flags' gdbarch method. |
| 1396 | |
| 1397 | Convert an address space qualifier to a type_instance_flag_value. */ |
| 1398 | |
| 1399 | static int |
| 1400 | avr_address_class_name_to_type_flags (struct gdbarch *gdbarch, |
| 1401 | const char* name, |
| 1402 | int *type_flags_ptr) |
| 1403 | { |
| 1404 | if (strcmp (name, "flash") == 0) |
| 1405 | { |
| 1406 | *type_flags_ptr = AVR_TYPE_INSTANCE_FLAG_ADDRESS_CLASS_FLASH; |
| 1407 | return 1; |
| 1408 | } |
| 1409 | else |
| 1410 | return 0; |
| 1411 | } |
| 1412 | |
| 1413 | /* Initialize the gdbarch structure for the AVR's. */ |
| 1414 | |
| 1415 | static struct gdbarch * |
| 1416 | avr_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches) |
| 1417 | { |
| 1418 | struct gdbarch *gdbarch; |
| 1419 | struct gdbarch_tdep *tdep; |
| 1420 | struct gdbarch_list *best_arch; |
| 1421 | int call_length; |
| 1422 | |
| 1423 | /* Avr-6 call instructions save 3 bytes. */ |
| 1424 | switch (info.bfd_arch_info->mach) |
| 1425 | { |
| 1426 | case bfd_mach_avr1: |
| 1427 | case bfd_mach_avrxmega1: |
| 1428 | case bfd_mach_avr2: |
| 1429 | case bfd_mach_avrxmega2: |
| 1430 | case bfd_mach_avr3: |
| 1431 | case bfd_mach_avrxmega3: |
| 1432 | case bfd_mach_avr4: |
| 1433 | case bfd_mach_avrxmega4: |
| 1434 | case bfd_mach_avr5: |
| 1435 | case bfd_mach_avrxmega5: |
| 1436 | default: |
| 1437 | call_length = 2; |
| 1438 | break; |
| 1439 | case bfd_mach_avr6: |
| 1440 | case bfd_mach_avrxmega6: |
| 1441 | case bfd_mach_avrxmega7: |
| 1442 | call_length = 3; |
| 1443 | break; |
| 1444 | } |
| 1445 | |
| 1446 | /* If there is already a candidate, use it. */ |
| 1447 | for (best_arch = gdbarch_list_lookup_by_info (arches, &info); |
| 1448 | best_arch != NULL; |
| 1449 | best_arch = gdbarch_list_lookup_by_info (best_arch->next, &info)) |
| 1450 | { |
| 1451 | if (gdbarch_tdep (best_arch->gdbarch)->call_length == call_length) |
| 1452 | return best_arch->gdbarch; |
| 1453 | } |
| 1454 | |
| 1455 | /* None found, create a new architecture from the information provided. */ |
| 1456 | tdep = XCNEW (struct gdbarch_tdep); |
| 1457 | gdbarch = gdbarch_alloc (&info, tdep); |
| 1458 | |
| 1459 | tdep->call_length = call_length; |
| 1460 | |
| 1461 | /* Create a type for PC. We can't use builtin types here, as they may not |
| 1462 | be defined. */ |
| 1463 | tdep->void_type = arch_type (gdbarch, TYPE_CODE_VOID, 1, "void"); |
| 1464 | tdep->func_void_type = make_function_type (tdep->void_type, NULL); |
| 1465 | tdep->pc_type = arch_pointer_type (gdbarch, 4 * TARGET_CHAR_BIT, NULL, |
| 1466 | tdep->func_void_type); |
| 1467 | |
| 1468 | set_gdbarch_short_bit (gdbarch, 2 * TARGET_CHAR_BIT); |
| 1469 | set_gdbarch_int_bit (gdbarch, 2 * TARGET_CHAR_BIT); |
| 1470 | set_gdbarch_long_bit (gdbarch, 4 * TARGET_CHAR_BIT); |
| 1471 | set_gdbarch_long_long_bit (gdbarch, 8 * TARGET_CHAR_BIT); |
| 1472 | set_gdbarch_ptr_bit (gdbarch, 2 * TARGET_CHAR_BIT); |
| 1473 | set_gdbarch_addr_bit (gdbarch, 32); |
| 1474 | |
| 1475 | set_gdbarch_wchar_bit (gdbarch, 2 * TARGET_CHAR_BIT); |
| 1476 | set_gdbarch_wchar_signed (gdbarch, 1); |
| 1477 | |
| 1478 | set_gdbarch_float_bit (gdbarch, 4 * TARGET_CHAR_BIT); |
| 1479 | set_gdbarch_double_bit (gdbarch, 4 * TARGET_CHAR_BIT); |
| 1480 | set_gdbarch_long_double_bit (gdbarch, 4 * TARGET_CHAR_BIT); |
| 1481 | |
| 1482 | set_gdbarch_float_format (gdbarch, floatformats_ieee_single); |
| 1483 | set_gdbarch_double_format (gdbarch, floatformats_ieee_single); |
| 1484 | set_gdbarch_long_double_format (gdbarch, floatformats_ieee_single); |
| 1485 | |
| 1486 | set_gdbarch_read_pc (gdbarch, avr_read_pc); |
| 1487 | set_gdbarch_write_pc (gdbarch, avr_write_pc); |
| 1488 | |
| 1489 | set_gdbarch_num_regs (gdbarch, AVR_NUM_REGS); |
| 1490 | |
| 1491 | set_gdbarch_sp_regnum (gdbarch, AVR_SP_REGNUM); |
| 1492 | set_gdbarch_pc_regnum (gdbarch, AVR_PC_REGNUM); |
| 1493 | |
| 1494 | set_gdbarch_register_name (gdbarch, avr_register_name); |
| 1495 | set_gdbarch_register_type (gdbarch, avr_register_type); |
| 1496 | |
| 1497 | set_gdbarch_num_pseudo_regs (gdbarch, AVR_NUM_PSEUDO_REGS); |
| 1498 | set_gdbarch_pseudo_register_read (gdbarch, avr_pseudo_register_read); |
| 1499 | set_gdbarch_pseudo_register_write (gdbarch, avr_pseudo_register_write); |
| 1500 | |
| 1501 | set_gdbarch_return_value (gdbarch, avr_return_value); |
| 1502 | |
| 1503 | set_gdbarch_push_dummy_call (gdbarch, avr_push_dummy_call); |
| 1504 | |
| 1505 | set_gdbarch_dwarf2_reg_to_regnum (gdbarch, avr_dwarf_reg_to_regnum); |
| 1506 | |
| 1507 | set_gdbarch_address_to_pointer (gdbarch, avr_address_to_pointer); |
| 1508 | set_gdbarch_pointer_to_address (gdbarch, avr_pointer_to_address); |
| 1509 | set_gdbarch_integer_to_address (gdbarch, avr_integer_to_address); |
| 1510 | |
| 1511 | set_gdbarch_skip_prologue (gdbarch, avr_skip_prologue); |
| 1512 | set_gdbarch_inner_than (gdbarch, core_addr_lessthan); |
| 1513 | |
| 1514 | set_gdbarch_breakpoint_kind_from_pc (gdbarch, avr_breakpoint::kind_from_pc); |
| 1515 | set_gdbarch_sw_breakpoint_from_kind (gdbarch, avr_breakpoint::bp_from_kind); |
| 1516 | |
| 1517 | frame_unwind_append_unwinder (gdbarch, &avr_frame_unwind); |
| 1518 | frame_base_set_default (gdbarch, &avr_frame_base); |
| 1519 | |
| 1520 | set_gdbarch_dummy_id (gdbarch, avr_dummy_id); |
| 1521 | |
| 1522 | set_gdbarch_unwind_pc (gdbarch, avr_unwind_pc); |
| 1523 | set_gdbarch_unwind_sp (gdbarch, avr_unwind_sp); |
| 1524 | |
| 1525 | set_gdbarch_address_class_type_flags (gdbarch, avr_address_class_type_flags); |
| 1526 | set_gdbarch_address_class_name_to_type_flags |
| 1527 | (gdbarch, avr_address_class_name_to_type_flags); |
| 1528 | set_gdbarch_address_class_type_flags_to_name |
| 1529 | (gdbarch, avr_address_class_type_flags_to_name); |
| 1530 | |
| 1531 | return gdbarch; |
| 1532 | } |
| 1533 | |
| 1534 | /* Send a query request to the avr remote target asking for values of the io |
| 1535 | registers. If args parameter is not NULL, then the user has requested info |
| 1536 | on a specific io register [This still needs implemented and is ignored for |
| 1537 | now]. The query string should be one of these forms: |
| 1538 | |
| 1539 | "Ravr.io_reg" -> reply is "NN" number of io registers |
| 1540 | |
| 1541 | "Ravr.io_reg:addr,len" where addr is first register and len is number of |
| 1542 | registers to be read. The reply should be "<NAME>,VV;" for each io register |
| 1543 | where, <NAME> is a string, and VV is the hex value of the register. |
| 1544 | |
| 1545 | All io registers are 8-bit. */ |
| 1546 | |
| 1547 | static void |
| 1548 | avr_io_reg_read_command (char *args, int from_tty) |
| 1549 | { |
| 1550 | LONGEST bufsiz = 0; |
| 1551 | gdb_byte *buf; |
| 1552 | const char *bufstr; |
| 1553 | char query[400]; |
| 1554 | const char *p; |
| 1555 | unsigned int nreg = 0; |
| 1556 | unsigned int val; |
| 1557 | int i, j, k, step; |
| 1558 | |
| 1559 | /* Find out how many io registers the target has. */ |
| 1560 | bufsiz = target_read_alloc (¤t_target, TARGET_OBJECT_AVR, |
| 1561 | "avr.io_reg", &buf); |
| 1562 | bufstr = (const char *) buf; |
| 1563 | |
| 1564 | if (bufsiz <= 0) |
| 1565 | { |
| 1566 | fprintf_unfiltered (gdb_stderr, |
| 1567 | _("ERR: info io_registers NOT supported " |
| 1568 | "by current target\n")); |
| 1569 | return; |
| 1570 | } |
| 1571 | |
| 1572 | if (sscanf (bufstr, "%x", &nreg) != 1) |
| 1573 | { |
| 1574 | fprintf_unfiltered (gdb_stderr, |
| 1575 | _("Error fetching number of io registers\n")); |
| 1576 | xfree (buf); |
| 1577 | return; |
| 1578 | } |
| 1579 | |
| 1580 | xfree (buf); |
| 1581 | |
| 1582 | reinitialize_more_filter (); |
| 1583 | |
| 1584 | printf_unfiltered (_("Target has %u io registers:\n\n"), nreg); |
| 1585 | |
| 1586 | /* only fetch up to 8 registers at a time to keep the buffer small */ |
| 1587 | step = 8; |
| 1588 | |
| 1589 | for (i = 0; i < nreg; i += step) |
| 1590 | { |
| 1591 | /* how many registers this round? */ |
| 1592 | j = step; |
| 1593 | if ((i+j) >= nreg) |
| 1594 | j = nreg - i; /* last block is less than 8 registers */ |
| 1595 | |
| 1596 | snprintf (query, sizeof (query) - 1, "avr.io_reg:%x,%x", i, j); |
| 1597 | bufsiz = target_read_alloc (¤t_target, TARGET_OBJECT_AVR, |
| 1598 | query, &buf); |
| 1599 | |
| 1600 | p = (const char *) buf; |
| 1601 | for (k = i; k < (i + j); k++) |
| 1602 | { |
| 1603 | if (sscanf (p, "%[^,],%x;", query, &val) == 2) |
| 1604 | { |
| 1605 | printf_filtered ("[%02x] %-15s : %02x\n", k, query, val); |
| 1606 | while ((*p != ';') && (*p != '\0')) |
| 1607 | p++; |
| 1608 | p++; /* skip over ';' */ |
| 1609 | if (*p == '\0') |
| 1610 | break; |
| 1611 | } |
| 1612 | } |
| 1613 | |
| 1614 | xfree (buf); |
| 1615 | } |
| 1616 | } |
| 1617 | |
| 1618 | void |
| 1619 | _initialize_avr_tdep (void) |
| 1620 | { |
| 1621 | register_gdbarch_init (bfd_arch_avr, avr_gdbarch_init); |
| 1622 | |
| 1623 | /* Add a new command to allow the user to query the avr remote target for |
| 1624 | the values of the io space registers in a saner way than just using |
| 1625 | `x/NNNb ADDR`. */ |
| 1626 | |
| 1627 | /* FIXME: TRoth/2002-02-18: This should probably be changed to 'info avr |
| 1628 | io_registers' to signify it is not available on other platforms. */ |
| 1629 | |
| 1630 | add_info ("io_registers", avr_io_reg_read_command, |
| 1631 | _("query remote avr target for io space register values")); |
| 1632 | } |