| 1 | /* Target-dependent code for the IA-64 for GDB, the GNU debugger. |
| 2 | Copyright 1999, 2000 |
| 3 | 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 2 of the License, or |
| 10 | (at your option) any later version. |
| 11 | |
| 12 | This program is distributed in the hope that it will be useful, |
| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | GNU General Public License for more details. |
| 16 | |
| 17 | You should have received a copy of the GNU General Public License |
| 18 | along with this program; if not, write to the Free Software |
| 19 | Foundation, Inc., 59 Temple Place - Suite 330, |
| 20 | Boston, MA 02111-1307, USA. */ |
| 21 | |
| 22 | #include "defs.h" |
| 23 | #include "inferior.h" |
| 24 | #include "symfile.h" /* for entry_point_address */ |
| 25 | #include "gdbcore.h" |
| 26 | #include "floatformat.h" |
| 27 | |
| 28 | #include "objfiles.h" |
| 29 | #include "elf/common.h" /* for DT_PLTGOT value */ |
| 30 | |
| 31 | typedef enum instruction_type |
| 32 | { |
| 33 | A, /* Integer ALU ; I-unit or M-unit */ |
| 34 | I, /* Non-ALU integer; I-unit */ |
| 35 | M, /* Memory ; M-unit */ |
| 36 | F, /* Floating-point ; F-unit */ |
| 37 | B, /* Branch ; B-unit */ |
| 38 | L, /* Extended (L+X) ; I-unit */ |
| 39 | X, /* Extended (L+X) ; I-unit */ |
| 40 | undefined /* undefined or reserved */ |
| 41 | } instruction_type; |
| 42 | |
| 43 | /* We represent IA-64 PC addresses as the value of the instruction |
| 44 | pointer or'd with some bit combination in the low nibble which |
| 45 | represents the slot number in the bundle addressed by the |
| 46 | instruction pointer. The problem is that the Linux kernel |
| 47 | multiplies its slot numbers (for exceptions) by one while the |
| 48 | disassembler multiplies its slot numbers by 6. In addition, I've |
| 49 | heard it said that the simulator uses 1 as the multiplier. |
| 50 | |
| 51 | I've fixed the disassembler so that the bytes_per_line field will |
| 52 | be the slot multiplier. If bytes_per_line comes in as zero, it |
| 53 | is set to six (which is how it was set up initially). -- objdump |
| 54 | displays pretty disassembly dumps with this value. For our purposes, |
| 55 | we'll set bytes_per_line to SLOT_MULTIPLIER. This is okay since we |
| 56 | never want to also display the raw bytes the way objdump does. */ |
| 57 | |
| 58 | #define SLOT_MULTIPLIER 1 |
| 59 | |
| 60 | /* Length in bytes of an instruction bundle */ |
| 61 | |
| 62 | #define BUNDLE_LEN 16 |
| 63 | |
| 64 | extern void _initialize_ia64_tdep (void); |
| 65 | |
| 66 | static gdbarch_init_ftype ia64_gdbarch_init; |
| 67 | |
| 68 | static gdbarch_register_name_ftype ia64_register_name; |
| 69 | static gdbarch_register_raw_size_ftype ia64_register_raw_size; |
| 70 | static gdbarch_register_virtual_size_ftype ia64_register_virtual_size; |
| 71 | static gdbarch_register_virtual_type_ftype ia64_register_virtual_type; |
| 72 | static gdbarch_register_byte_ftype ia64_register_byte; |
| 73 | static gdbarch_breakpoint_from_pc_ftype ia64_breakpoint_from_pc; |
| 74 | static gdbarch_frame_chain_ftype ia64_frame_chain; |
| 75 | static gdbarch_frame_saved_pc_ftype ia64_frame_saved_pc; |
| 76 | static gdbarch_skip_prologue_ftype ia64_skip_prologue; |
| 77 | static gdbarch_frame_init_saved_regs_ftype ia64_frame_init_saved_regs; |
| 78 | static gdbarch_get_saved_register_ftype ia64_get_saved_register; |
| 79 | static gdbarch_extract_return_value_ftype ia64_extract_return_value; |
| 80 | static gdbarch_extract_struct_value_address_ftype ia64_extract_struct_value_address; |
| 81 | static gdbarch_use_struct_convention_ftype ia64_use_struct_convention; |
| 82 | static gdbarch_frameless_function_invocation_ftype ia64_frameless_function_invocation; |
| 83 | static gdbarch_init_extra_frame_info_ftype ia64_init_extra_frame_info; |
| 84 | static gdbarch_store_return_value_ftype ia64_store_return_value; |
| 85 | static gdbarch_store_struct_return_ftype ia64_store_struct_return; |
| 86 | static gdbarch_push_arguments_ftype ia64_push_arguments; |
| 87 | static gdbarch_push_return_address_ftype ia64_push_return_address; |
| 88 | static gdbarch_pop_frame_ftype ia64_pop_frame; |
| 89 | static gdbarch_saved_pc_after_call_ftype ia64_saved_pc_after_call; |
| 90 | static void ia64_pop_frame_regular (struct frame_info *frame); |
| 91 | static struct type *is_float_or_hfa_type (struct type *t); |
| 92 | |
| 93 | static int ia64_num_regs = 590; |
| 94 | |
| 95 | static int pc_regnum = IA64_IP_REGNUM; |
| 96 | static int sp_regnum = IA64_GR12_REGNUM; |
| 97 | static int fp_regnum = IA64_VFP_REGNUM; |
| 98 | static int lr_regnum = IA64_VRAP_REGNUM; |
| 99 | |
| 100 | static LONGEST ia64_call_dummy_words[] = {0}; |
| 101 | |
| 102 | /* Array of register names; There should be ia64_num_regs strings in |
| 103 | the initializer. */ |
| 104 | |
| 105 | static char *ia64_register_names[] = |
| 106 | { "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", |
| 107 | "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15", |
| 108 | "r16", "r17", "r18", "r19", "r20", "r21", "r22", "r23", |
| 109 | "r24", "r25", "r26", "r27", "r28", "r29", "r30", "r31", |
| 110 | "r32", "r33", "r34", "r35", "r36", "r37", "r38", "r39", |
| 111 | "r40", "r41", "r42", "r43", "r44", "r45", "r46", "r47", |
| 112 | "r48", "r49", "r50", "r51", "r52", "r53", "r54", "r55", |
| 113 | "r56", "r57", "r58", "r59", "r60", "r61", "r62", "r63", |
| 114 | "r64", "r65", "r66", "r67", "r68", "r69", "r70", "r71", |
| 115 | "r72", "r73", "r74", "r75", "r76", "r77", "r78", "r79", |
| 116 | "r80", "r81", "r82", "r83", "r84", "r85", "r86", "r87", |
| 117 | "r88", "r89", "r90", "r91", "r92", "r93", "r94", "r95", |
| 118 | "r96", "r97", "r98", "r99", "r100", "r101", "r102", "r103", |
| 119 | "r104", "r105", "r106", "r107", "r108", "r109", "r110", "r111", |
| 120 | "r112", "r113", "r114", "r115", "r116", "r117", "r118", "r119", |
| 121 | "r120", "r121", "r122", "r123", "r124", "r125", "r126", "r127", |
| 122 | |
| 123 | "f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7", |
| 124 | "f8", "f9", "f10", "f11", "f12", "f13", "f14", "f15", |
| 125 | "f16", "f17", "f18", "f19", "f20", "f21", "f22", "f23", |
| 126 | "f24", "f25", "f26", "f27", "f28", "f29", "f30", "f31", |
| 127 | "f32", "f33", "f34", "f35", "f36", "f37", "f38", "f39", |
| 128 | "f40", "f41", "f42", "f43", "f44", "f45", "f46", "f47", |
| 129 | "f48", "f49", "f50", "f51", "f52", "f53", "f54", "f55", |
| 130 | "f56", "f57", "f58", "f59", "f60", "f61", "f62", "f63", |
| 131 | "f64", "f65", "f66", "f67", "f68", "f69", "f70", "f71", |
| 132 | "f72", "f73", "f74", "f75", "f76", "f77", "f78", "f79", |
| 133 | "f80", "f81", "f82", "f83", "f84", "f85", "f86", "f87", |
| 134 | "f88", "f89", "f90", "f91", "f92", "f93", "f94", "f95", |
| 135 | "f96", "f97", "f98", "f99", "f100", "f101", "f102", "f103", |
| 136 | "f104", "f105", "f106", "f107", "f108", "f109", "f110", "f111", |
| 137 | "f112", "f113", "f114", "f115", "f116", "f117", "f118", "f119", |
| 138 | "f120", "f121", "f122", "f123", "f124", "f125", "f126", "f127", |
| 139 | |
| 140 | "p0", "p1", "p2", "p3", "p4", "p5", "p6", "p7", |
| 141 | "p8", "p9", "p10", "p11", "p12", "p13", "p14", "p15", |
| 142 | "p16", "p17", "p18", "p19", "p20", "p21", "p22", "p23", |
| 143 | "p24", "p25", "p26", "p27", "p28", "p29", "p30", "p31", |
| 144 | "p32", "p33", "p34", "p35", "p36", "p37", "p38", "p39", |
| 145 | "p40", "p41", "p42", "p43", "p44", "p45", "p46", "p47", |
| 146 | "p48", "p49", "p50", "p51", "p52", "p53", "p54", "p55", |
| 147 | "p56", "p57", "p58", "p59", "p60", "p61", "p62", "p63", |
| 148 | |
| 149 | "b0", "b1", "b2", "b3", "b4", "b5", "b6", "b7", |
| 150 | |
| 151 | "vfp", "vrap", |
| 152 | |
| 153 | "pr", "ip", "psr", "cfm", |
| 154 | |
| 155 | "kr0", "kr1", "kr2", "kr3", "kr4", "kr5", "kr6", "kr7", |
| 156 | "", "", "", "", "", "", "", "", |
| 157 | "rsc", "bsp", "bspstore", "rnat", |
| 158 | "", "fcr", "", "", |
| 159 | "eflag", "csd", "ssd", "cflg", "fsr", "fir", "fdr", "", |
| 160 | "ccv", "", "", "", "unat", "", "", "", |
| 161 | "fpsr", "", "", "", "itc", |
| 162 | "", "", "", "", "", "", "", "", "", "", |
| 163 | "", "", "", "", "", "", "", "", "", |
| 164 | "pfs", "lc", "ec", |
| 165 | "", "", "", "", "", "", "", "", "", "", |
| 166 | "", "", "", "", "", "", "", "", "", "", |
| 167 | "", "", "", "", "", "", "", "", "", "", |
| 168 | "", "", "", "", "", "", "", "", "", "", |
| 169 | "", "", "", "", "", "", "", "", "", "", |
| 170 | "", "", "", "", "", "", "", "", "", "", |
| 171 | "", |
| 172 | "nat0", "nat1", "nat2", "nat3", "nat4", "nat5", "nat6", "nat7", |
| 173 | "nat8", "nat9", "nat10", "nat11", "nat12", "nat13", "nat14", "nat15", |
| 174 | "nat16", "nat17", "nat18", "nat19", "nat20", "nat21", "nat22", "nat23", |
| 175 | "nat24", "nat25", "nat26", "nat27", "nat28", "nat29", "nat30", "nat31", |
| 176 | "nat32", "nat33", "nat34", "nat35", "nat36", "nat37", "nat38", "nat39", |
| 177 | "nat40", "nat41", "nat42", "nat43", "nat44", "nat45", "nat46", "nat47", |
| 178 | "nat48", "nat49", "nat50", "nat51", "nat52", "nat53", "nat54", "nat55", |
| 179 | "nat56", "nat57", "nat58", "nat59", "nat60", "nat61", "nat62", "nat63", |
| 180 | "nat64", "nat65", "nat66", "nat67", "nat68", "nat69", "nat70", "nat71", |
| 181 | "nat72", "nat73", "nat74", "nat75", "nat76", "nat77", "nat78", "nat79", |
| 182 | "nat80", "nat81", "nat82", "nat83", "nat84", "nat85", "nat86", "nat87", |
| 183 | "nat88", "nat89", "nat90", "nat91", "nat92", "nat93", "nat94", "nat95", |
| 184 | "nat96", "nat97", "nat98", "nat99", "nat100","nat101","nat102","nat103", |
| 185 | "nat104","nat105","nat106","nat107","nat108","nat109","nat110","nat111", |
| 186 | "nat112","nat113","nat114","nat115","nat116","nat117","nat118","nat119", |
| 187 | "nat120","nat121","nat122","nat123","nat124","nat125","nat126","nat127", |
| 188 | }; |
| 189 | |
| 190 | struct frame_extra_info |
| 191 | { |
| 192 | CORE_ADDR bsp; /* points at r32 for the current frame */ |
| 193 | CORE_ADDR cfm; /* cfm value for current frame */ |
| 194 | int sof; /* Size of frame (decoded from cfm value) */ |
| 195 | int sol; /* Size of locals (decoded from cfm value) */ |
| 196 | CORE_ADDR after_prologue; |
| 197 | /* Address of first instruction after the last |
| 198 | prologue instruction; Note that there may |
| 199 | be instructions from the function's body |
| 200 | intermingled with the prologue. */ |
| 201 | int mem_stack_frame_size; |
| 202 | /* Size of the memory stack frame (may be zero), |
| 203 | or -1 if it has not been determined yet. */ |
| 204 | int fp_reg; /* Register number (if any) used a frame pointer |
| 205 | for this frame. 0 if no register is being used |
| 206 | as the frame pointer. */ |
| 207 | }; |
| 208 | |
| 209 | static char * |
| 210 | ia64_register_name (int reg) |
| 211 | { |
| 212 | return ia64_register_names[reg]; |
| 213 | } |
| 214 | |
| 215 | int |
| 216 | ia64_register_raw_size (int reg) |
| 217 | { |
| 218 | return (IA64_FR0_REGNUM <= reg && reg <= IA64_FR127_REGNUM) ? 16 : 8; |
| 219 | } |
| 220 | |
| 221 | int |
| 222 | ia64_register_virtual_size (int reg) |
| 223 | { |
| 224 | return (IA64_FR0_REGNUM <= reg && reg <= IA64_FR127_REGNUM) ? 16 : 8; |
| 225 | } |
| 226 | |
| 227 | /* Return true iff register N's virtual format is different from |
| 228 | its raw format. */ |
| 229 | int |
| 230 | ia64_register_convertible (int nr) |
| 231 | { |
| 232 | return (IA64_FR0_REGNUM <= nr && nr <= IA64_FR127_REGNUM); |
| 233 | } |
| 234 | |
| 235 | const struct floatformat floatformat_ia64_ext = |
| 236 | { |
| 237 | floatformat_little, 82, 0, 1, 17, 65535, 0x1ffff, 18, 64, |
| 238 | floatformat_intbit_yes |
| 239 | }; |
| 240 | |
| 241 | void |
| 242 | ia64_register_convert_to_virtual (int regnum, struct type *type, |
| 243 | char *from, char *to) |
| 244 | { |
| 245 | if (regnum >= IA64_FR0_REGNUM && regnum <= IA64_FR127_REGNUM) |
| 246 | { |
| 247 | DOUBLEST val; |
| 248 | floatformat_to_doublest (&floatformat_ia64_ext, from, &val); |
| 249 | store_floating(to, TYPE_LENGTH(type), val); |
| 250 | } |
| 251 | else |
| 252 | error("ia64_register_convert_to_virtual called with non floating point register number"); |
| 253 | } |
| 254 | |
| 255 | void |
| 256 | ia64_register_convert_to_raw (struct type *type, int regnum, |
| 257 | char *from, char *to) |
| 258 | { |
| 259 | if (regnum >= IA64_FR0_REGNUM && regnum <= IA64_FR127_REGNUM) |
| 260 | { |
| 261 | DOUBLEST val = extract_floating (from, TYPE_LENGTH(type)); |
| 262 | floatformat_from_doublest (&floatformat_ia64_ext, &val, to); |
| 263 | } |
| 264 | else |
| 265 | error("ia64_register_convert_to_raw called with non floating point register number"); |
| 266 | } |
| 267 | |
| 268 | struct type * |
| 269 | ia64_register_virtual_type (int reg) |
| 270 | { |
| 271 | if (reg >= IA64_FR0_REGNUM && reg <= IA64_FR127_REGNUM) |
| 272 | return builtin_type_long_double; |
| 273 | else |
| 274 | return builtin_type_long; |
| 275 | } |
| 276 | |
| 277 | int |
| 278 | ia64_register_byte (int reg) |
| 279 | { |
| 280 | return (8 * reg) + |
| 281 | (reg <= IA64_FR0_REGNUM ? 0 : 8 * ((reg > IA64_FR127_REGNUM) ? 128 : reg - IA64_FR0_REGNUM)); |
| 282 | } |
| 283 | |
| 284 | /* Extract ``len'' bits from an instruction bundle starting at |
| 285 | bit ``from''. */ |
| 286 | |
| 287 | long long |
| 288 | extract_bit_field (char *bundle, int from, int len) |
| 289 | { |
| 290 | long long result = 0LL; |
| 291 | int to = from + len; |
| 292 | int from_byte = from / 8; |
| 293 | int to_byte = to / 8; |
| 294 | unsigned char *b = (unsigned char *) bundle; |
| 295 | unsigned char c; |
| 296 | int lshift; |
| 297 | int i; |
| 298 | |
| 299 | c = b[from_byte]; |
| 300 | if (from_byte == to_byte) |
| 301 | c = ((unsigned char) (c << (8 - to % 8))) >> (8 - to % 8); |
| 302 | result = c >> (from % 8); |
| 303 | lshift = 8 - (from % 8); |
| 304 | |
| 305 | for (i = from_byte+1; i < to_byte; i++) |
| 306 | { |
| 307 | result |= ((long long) b[i]) << lshift; |
| 308 | lshift += 8; |
| 309 | } |
| 310 | |
| 311 | if (from_byte < to_byte && (to % 8 != 0)) |
| 312 | { |
| 313 | c = b[to_byte]; |
| 314 | c = ((unsigned char) (c << (8 - to % 8))) >> (8 - to % 8); |
| 315 | result |= ((long long) c) << lshift; |
| 316 | } |
| 317 | |
| 318 | return result; |
| 319 | } |
| 320 | |
| 321 | /* Replace the specified bits in an instruction bundle */ |
| 322 | |
| 323 | void |
| 324 | replace_bit_field (char *bundle, long long val, int from, int len) |
| 325 | { |
| 326 | int to = from + len; |
| 327 | int from_byte = from / 8; |
| 328 | int to_byte = to / 8; |
| 329 | unsigned char *b = (unsigned char *) bundle; |
| 330 | unsigned char c; |
| 331 | |
| 332 | if (from_byte == to_byte) |
| 333 | { |
| 334 | unsigned char left, right; |
| 335 | c = b[from_byte]; |
| 336 | left = (c >> (to % 8)) << (to % 8); |
| 337 | right = ((unsigned char) (c << (8 - from % 8))) >> (8 - from % 8); |
| 338 | c = (unsigned char) (val & 0xff); |
| 339 | c = (unsigned char) (c << (from % 8 + 8 - to % 8)) >> (8 - to % 8); |
| 340 | c |= right | left; |
| 341 | b[from_byte] = c; |
| 342 | } |
| 343 | else |
| 344 | { |
| 345 | int i; |
| 346 | c = b[from_byte]; |
| 347 | c = ((unsigned char) (c << (8 - from % 8))) >> (8 - from % 8); |
| 348 | c = c | (val << (from % 8)); |
| 349 | b[from_byte] = c; |
| 350 | val >>= 8 - from % 8; |
| 351 | |
| 352 | for (i = from_byte+1; i < to_byte; i++) |
| 353 | { |
| 354 | c = val & 0xff; |
| 355 | val >>= 8; |
| 356 | b[i] = c; |
| 357 | } |
| 358 | |
| 359 | if (to % 8 != 0) |
| 360 | { |
| 361 | unsigned char cv = (unsigned char) val; |
| 362 | c = b[to_byte]; |
| 363 | c = c >> (to % 8) << (to % 8); |
| 364 | c |= ((unsigned char) (cv << (8 - to % 8))) >> (8 - to % 8); |
| 365 | b[to_byte] = c; |
| 366 | } |
| 367 | } |
| 368 | } |
| 369 | |
| 370 | /* Return the contents of slot N (for N = 0, 1, or 2) in |
| 371 | and instruction bundle */ |
| 372 | |
| 373 | long long |
| 374 | slotN_contents (unsigned char *bundle, int slotnum) |
| 375 | { |
| 376 | return extract_bit_field (bundle, 5+41*slotnum, 41); |
| 377 | } |
| 378 | |
| 379 | /* Store an instruction in an instruction bundle */ |
| 380 | |
| 381 | void |
| 382 | replace_slotN_contents (unsigned char *bundle, long long instr, int slotnum) |
| 383 | { |
| 384 | replace_bit_field (bundle, instr, 5+41*slotnum, 41); |
| 385 | } |
| 386 | |
| 387 | static enum instruction_type template_encoding_table[32][3] = |
| 388 | { |
| 389 | { M, I, I }, /* 00 */ |
| 390 | { M, I, I }, /* 01 */ |
| 391 | { M, I, I }, /* 02 */ |
| 392 | { M, I, I }, /* 03 */ |
| 393 | { M, L, X }, /* 04 */ |
| 394 | { M, L, X }, /* 05 */ |
| 395 | { undefined, undefined, undefined }, /* 06 */ |
| 396 | { undefined, undefined, undefined }, /* 07 */ |
| 397 | { M, M, I }, /* 08 */ |
| 398 | { M, M, I }, /* 09 */ |
| 399 | { M, M, I }, /* 0A */ |
| 400 | { M, M, I }, /* 0B */ |
| 401 | { M, F, I }, /* 0C */ |
| 402 | { M, F, I }, /* 0D */ |
| 403 | { M, M, F }, /* 0E */ |
| 404 | { M, M, F }, /* 0F */ |
| 405 | { M, I, B }, /* 10 */ |
| 406 | { M, I, B }, /* 11 */ |
| 407 | { M, B, B }, /* 12 */ |
| 408 | { M, B, B }, /* 13 */ |
| 409 | { undefined, undefined, undefined }, /* 14 */ |
| 410 | { undefined, undefined, undefined }, /* 15 */ |
| 411 | { B, B, B }, /* 16 */ |
| 412 | { B, B, B }, /* 17 */ |
| 413 | { M, M, B }, /* 18 */ |
| 414 | { M, M, B }, /* 19 */ |
| 415 | { undefined, undefined, undefined }, /* 1A */ |
| 416 | { undefined, undefined, undefined }, /* 1B */ |
| 417 | { M, F, B }, /* 1C */ |
| 418 | { M, F, B }, /* 1D */ |
| 419 | { undefined, undefined, undefined }, /* 1E */ |
| 420 | { undefined, undefined, undefined }, /* 1F */ |
| 421 | }; |
| 422 | |
| 423 | /* Fetch and (partially) decode an instruction at ADDR and return the |
| 424 | address of the next instruction to fetch. */ |
| 425 | |
| 426 | static CORE_ADDR |
| 427 | fetch_instruction (CORE_ADDR addr, instruction_type *it, long long *instr) |
| 428 | { |
| 429 | char bundle[BUNDLE_LEN]; |
| 430 | int slotnum = (int) (addr & 0x0f) / SLOT_MULTIPLIER; |
| 431 | long long template; |
| 432 | int val; |
| 433 | |
| 434 | if (slotnum > 2) |
| 435 | error("Can't fetch instructions for slot numbers greater than 2."); |
| 436 | |
| 437 | addr &= ~0x0f; |
| 438 | |
| 439 | val = target_read_memory (addr, bundle, BUNDLE_LEN); |
| 440 | |
| 441 | if (val != 0) |
| 442 | return 0; |
| 443 | |
| 444 | *instr = slotN_contents (bundle, slotnum); |
| 445 | template = extract_bit_field (bundle, 0, 5); |
| 446 | *it = template_encoding_table[(int)template][slotnum]; |
| 447 | |
| 448 | if (slotnum == 2 || (slotnum == 1 && *it == L)) |
| 449 | addr += 16; |
| 450 | else |
| 451 | addr += (slotnum + 1) * SLOT_MULTIPLIER; |
| 452 | |
| 453 | return addr; |
| 454 | } |
| 455 | |
| 456 | /* There are 5 different break instructions (break.i, break.b, |
| 457 | break.m, break.f, and break.x), but they all have the same |
| 458 | encoding. (The five bit template in the low five bits of the |
| 459 | instruction bundle distinguishes one from another.) |
| 460 | |
| 461 | The runtime architecture manual specifies that break instructions |
| 462 | used for debugging purposes must have the upper two bits of the 21 |
| 463 | bit immediate set to a 0 and a 1 respectively. A breakpoint |
| 464 | instruction encodes the most significant bit of its 21 bit |
| 465 | immediate at bit 36 of the 41 bit instruction. The penultimate msb |
| 466 | is at bit 25 which leads to the pattern below. |
| 467 | |
| 468 | Originally, I had this set up to do, e.g, a "break.i 0x80000" But |
| 469 | it turns out that 0x80000 was used as the syscall break in the early |
| 470 | simulators. So I changed the pattern slightly to do "break.i 0x080001" |
| 471 | instead. But that didn't work either (I later found out that this |
| 472 | pattern was used by the simulator that I was using.) So I ended up |
| 473 | using the pattern seen below. */ |
| 474 | |
| 475 | #if 0 |
| 476 | #define BREAKPOINT 0x00002000040LL |
| 477 | #endif |
| 478 | #define BREAKPOINT 0x00003333300LL |
| 479 | |
| 480 | static int |
| 481 | ia64_memory_insert_breakpoint (CORE_ADDR addr, char *contents_cache) |
| 482 | { |
| 483 | char bundle[BUNDLE_LEN]; |
| 484 | int slotnum = (int) (addr & 0x0f) / SLOT_MULTIPLIER; |
| 485 | long long instr; |
| 486 | int val; |
| 487 | |
| 488 | if (slotnum > 2) |
| 489 | error("Can't insert breakpoint for slot numbers greater than 2."); |
| 490 | |
| 491 | addr &= ~0x0f; |
| 492 | |
| 493 | val = target_read_memory (addr, bundle, BUNDLE_LEN); |
| 494 | instr = slotN_contents (bundle, slotnum); |
| 495 | memcpy(contents_cache, &instr, sizeof(instr)); |
| 496 | replace_slotN_contents (bundle, BREAKPOINT, slotnum); |
| 497 | if (val == 0) |
| 498 | target_write_memory (addr, bundle, BUNDLE_LEN); |
| 499 | |
| 500 | return val; |
| 501 | } |
| 502 | |
| 503 | static int |
| 504 | ia64_memory_remove_breakpoint (CORE_ADDR addr, char *contents_cache) |
| 505 | { |
| 506 | char bundle[BUNDLE_LEN]; |
| 507 | int slotnum = (addr & 0x0f) / SLOT_MULTIPLIER; |
| 508 | long long instr; |
| 509 | int val; |
| 510 | |
| 511 | addr &= ~0x0f; |
| 512 | |
| 513 | val = target_read_memory (addr, bundle, BUNDLE_LEN); |
| 514 | memcpy (&instr, contents_cache, sizeof instr); |
| 515 | replace_slotN_contents (bundle, instr, slotnum); |
| 516 | if (val == 0) |
| 517 | target_write_memory (addr, bundle, BUNDLE_LEN); |
| 518 | |
| 519 | return val; |
| 520 | } |
| 521 | |
| 522 | /* We don't really want to use this, but remote.c needs to call it in order |
| 523 | to figure out if Z-packets are supported or not. Oh, well. */ |
| 524 | unsigned char * |
| 525 | ia64_breakpoint_from_pc (pcptr, lenptr) |
| 526 | CORE_ADDR *pcptr; |
| 527 | int *lenptr; |
| 528 | { |
| 529 | static unsigned char breakpoint[] = |
| 530 | { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }; |
| 531 | *lenptr = sizeof (breakpoint); |
| 532 | #if 0 |
| 533 | *pcptr &= ~0x0f; |
| 534 | #endif |
| 535 | return breakpoint; |
| 536 | } |
| 537 | |
| 538 | CORE_ADDR |
| 539 | ia64_read_pc (int pid) |
| 540 | { |
| 541 | CORE_ADDR psr_value = read_register_pid (IA64_PSR_REGNUM, pid); |
| 542 | CORE_ADDR pc_value = read_register_pid (IA64_IP_REGNUM, pid); |
| 543 | int slot_num = (psr_value >> 41) & 3; |
| 544 | |
| 545 | return pc_value | (slot_num * SLOT_MULTIPLIER); |
| 546 | } |
| 547 | |
| 548 | void |
| 549 | ia64_write_pc (CORE_ADDR new_pc, int pid) |
| 550 | { |
| 551 | int slot_num = (int) (new_pc & 0xf) / SLOT_MULTIPLIER; |
| 552 | CORE_ADDR psr_value = read_register_pid (IA64_PSR_REGNUM, pid); |
| 553 | psr_value &= ~(3LL << 41); |
| 554 | psr_value |= (CORE_ADDR)(slot_num & 0x3) << 41; |
| 555 | |
| 556 | new_pc &= ~0xfLL; |
| 557 | |
| 558 | write_register_pid (IA64_PSR_REGNUM, psr_value, pid); |
| 559 | write_register_pid (IA64_IP_REGNUM, new_pc, pid); |
| 560 | } |
| 561 | |
| 562 | #define IS_NaT_COLLECTION_ADDR(addr) ((((addr) >> 3) & 0x3f) == 0x3f) |
| 563 | |
| 564 | /* Returns the address of the slot that's NSLOTS slots away from |
| 565 | the address ADDR. NSLOTS may be positive or negative. */ |
| 566 | static CORE_ADDR |
| 567 | rse_address_add(CORE_ADDR addr, int nslots) |
| 568 | { |
| 569 | CORE_ADDR new_addr; |
| 570 | int mandatory_nat_slots = nslots / 63; |
| 571 | int direction = nslots < 0 ? -1 : 1; |
| 572 | |
| 573 | new_addr = addr + 8 * (nslots + mandatory_nat_slots); |
| 574 | |
| 575 | if ((new_addr >> 9) != ((addr + 8 * 64 * mandatory_nat_slots) >> 9)) |
| 576 | new_addr += 8 * direction; |
| 577 | |
| 578 | if (IS_NaT_COLLECTION_ADDR(new_addr)) |
| 579 | new_addr += 8 * direction; |
| 580 | |
| 581 | return new_addr; |
| 582 | } |
| 583 | |
| 584 | /* The IA-64 frame chain is a bit odd. We won't always have a frame |
| 585 | pointer, so we use the SP value as the FP for the purpose of |
| 586 | creating a frame. There is sometimes a register (not fixed) which |
| 587 | is used as a frame pointer. When this register exists, it is not |
| 588 | especially hard to determine which one is being used. It isn't |
| 589 | even really hard to compute the frame chain, but it can be |
| 590 | computationally expensive. So, instead of making life difficult |
| 591 | (and slow), we pick a more convenient representation of the frame |
| 592 | chain, knowing that we'll have to make some small adjustments |
| 593 | in other places. (E.g, note that read_fp() and write_fp() are |
| 594 | actually read_sp() and write_sp() below in ia64_gdbarch_init() |
| 595 | below.) |
| 596 | |
| 597 | Okay, so what is the frame chain exactly? It'll be the SP value |
| 598 | at the time that the function in question was entered. |
| 599 | |
| 600 | Note that this *should* actually the frame pointer for the current |
| 601 | function! But as I note above, if we were to attempt to find the |
| 602 | address of the beginning of the previous frame, we'd waste a lot |
| 603 | of cycles for no good reason. So instead, we simply choose to |
| 604 | represent the frame chain as the end of the previous frame instead |
| 605 | of the beginning. */ |
| 606 | |
| 607 | CORE_ADDR |
| 608 | ia64_frame_chain (struct frame_info *frame) |
| 609 | { |
| 610 | FRAME_INIT_SAVED_REGS (frame); |
| 611 | |
| 612 | if (frame->saved_regs[IA64_VFP_REGNUM]) |
| 613 | return read_memory_integer (frame->saved_regs[IA64_VFP_REGNUM], 8); |
| 614 | else |
| 615 | return frame->frame + frame->extra_info->mem_stack_frame_size; |
| 616 | } |
| 617 | |
| 618 | CORE_ADDR |
| 619 | ia64_frame_saved_pc (struct frame_info *frame) |
| 620 | { |
| 621 | FRAME_INIT_SAVED_REGS (frame); |
| 622 | |
| 623 | if (frame->saved_regs[IA64_VRAP_REGNUM]) |
| 624 | return read_memory_integer (frame->saved_regs[IA64_VRAP_REGNUM], 8); |
| 625 | else /* either frameless, or not far enough along in the prologue... */ |
| 626 | return ia64_saved_pc_after_call (frame); |
| 627 | } |
| 628 | |
| 629 | #define isScratch(_regnum_) ((_regnum_) == 2 || (_regnum_) == 3 \ |
| 630 | || (8 <= (_regnum_) && (_regnum_) <= 11) \ |
| 631 | || (14 <= (_regnum_) && (_regnum_) <= 31)) |
| 632 | #define imm9(_instr_) \ |
| 633 | ( ((((_instr_) & 0x01000000000LL) ? -1 : 0) << 8) \ |
| 634 | | (((_instr_) & 0x00008000000LL) >> 20) \ |
| 635 | | (((_instr_) & 0x00000001fc0LL) >> 6)) |
| 636 | |
| 637 | static CORE_ADDR |
| 638 | examine_prologue (CORE_ADDR pc, CORE_ADDR lim_pc, struct frame_info *frame) |
| 639 | { |
| 640 | CORE_ADDR next_pc; |
| 641 | CORE_ADDR last_prologue_pc = pc; |
| 642 | instruction_type it; |
| 643 | long long instr; |
| 644 | int do_fsr_stuff = 0; |
| 645 | |
| 646 | int cfm_reg = 0; |
| 647 | int ret_reg = 0; |
| 648 | int fp_reg = 0; |
| 649 | int unat_save_reg = 0; |
| 650 | int pr_save_reg = 0; |
| 651 | int mem_stack_frame_size = 0; |
| 652 | int spill_reg = 0; |
| 653 | CORE_ADDR spill_addr = 0; |
| 654 | |
| 655 | if (frame && !frame->saved_regs) |
| 656 | { |
| 657 | frame_saved_regs_zalloc (frame); |
| 658 | do_fsr_stuff = 1; |
| 659 | } |
| 660 | |
| 661 | if (frame |
| 662 | && !do_fsr_stuff |
| 663 | && frame->extra_info->after_prologue != 0 |
| 664 | && frame->extra_info->after_prologue <= lim_pc) |
| 665 | return frame->extra_info->after_prologue; |
| 666 | |
| 667 | /* Must start with an alloc instruction */ |
| 668 | next_pc = fetch_instruction (pc, &it, &instr); |
| 669 | if (pc < lim_pc && next_pc |
| 670 | && it == M && ((instr & 0x1ee0000003fLL) == 0x02c00000000LL)) |
| 671 | { |
| 672 | /* alloc */ |
| 673 | int sor = (int) ((instr & 0x00078000000LL) >> 27); |
| 674 | int sol = (int) ((instr & 0x00007f00000LL) >> 20); |
| 675 | int sof = (int) ((instr & 0x000000fe000LL) >> 13); |
| 676 | /* Okay, so sor, sol, and sof aren't used right now; but perhaps |
| 677 | we could compare against the size given to us via the cfm as |
| 678 | either a sanity check or possibly to see if the frame has been |
| 679 | changed by a later alloc instruction... */ |
| 680 | int rN = (int) ((instr & 0x00000001fc0LL) >> 6); |
| 681 | cfm_reg = rN; |
| 682 | last_prologue_pc = next_pc; |
| 683 | pc = next_pc; |
| 684 | } |
| 685 | else |
| 686 | pc = lim_pc; /* We're done early */ |
| 687 | |
| 688 | /* Loop, looking for prologue instructions, keeping track of |
| 689 | where preserved registers were spilled. */ |
| 690 | while (pc < lim_pc) |
| 691 | { |
| 692 | next_pc = fetch_instruction (pc, &it, &instr); |
| 693 | if (next_pc == 0) |
| 694 | break; |
| 695 | |
| 696 | if (it == I && ((instr & 0x1eff8000000LL) == 0x00188000000LL)) |
| 697 | { |
| 698 | /* Move from BR */ |
| 699 | int b2 = (int) ((instr & 0x0000000e000LL) >> 13); |
| 700 | int rN = (int) ((instr & 0x00000001fc0LL) >> 6); |
| 701 | int qp = (int) (instr & 0x0000000003f); |
| 702 | |
| 703 | if (qp == 0 && b2 == 0 && rN >= 32 && ret_reg == 0) |
| 704 | { |
| 705 | ret_reg = rN; |
| 706 | last_prologue_pc = next_pc; |
| 707 | } |
| 708 | } |
| 709 | else if ((it == I || it == M) |
| 710 | && ((instr & 0x1ee00000000LL) == 0x10800000000LL)) |
| 711 | { |
| 712 | /* adds rN = imm14, rM (or mov rN, rM when imm14 is 0) */ |
| 713 | int imm = (int) ((((instr & 0x01000000000LL) ? -1 : 0) << 13) |
| 714 | | ((instr & 0x001f8000000LL) >> 20) |
| 715 | | ((instr & 0x000000fe000LL) >> 13)); |
| 716 | int rM = (int) ((instr & 0x00007f00000LL) >> 20); |
| 717 | int rN = (int) ((instr & 0x00000001fc0LL) >> 6); |
| 718 | int qp = (int) (instr & 0x0000000003fLL); |
| 719 | |
| 720 | if (qp == 0 && rN >= 32 && imm == 0 && rM == 12 && fp_reg == 0) |
| 721 | { |
| 722 | /* mov rN, r12 */ |
| 723 | fp_reg = rN; |
| 724 | last_prologue_pc = next_pc; |
| 725 | } |
| 726 | else if (qp == 0 && rN == 12 && rM == 12) |
| 727 | { |
| 728 | /* adds r12, -mem_stack_frame_size, r12 */ |
| 729 | mem_stack_frame_size -= imm; |
| 730 | last_prologue_pc = next_pc; |
| 731 | } |
| 732 | else if (qp == 0 && rN == 2 |
| 733 | && ((rM == fp_reg && fp_reg != 0) || rM == 12)) |
| 734 | { |
| 735 | /* adds r2, spilloffset, rFramePointer |
| 736 | or |
| 737 | adds r2, spilloffset, r12 |
| 738 | |
| 739 | Get ready for stf.spill or st8.spill instructions. |
| 740 | The address to start spilling at is loaded into r2. |
| 741 | FIXME: Why r2? That's what gcc currently uses; it |
| 742 | could well be different for other compilers. */ |
| 743 | |
| 744 | /* Hmm... whether or not this will work will depend on |
| 745 | where the pc is. If it's still early in the prologue |
| 746 | this'll be wrong. FIXME */ |
| 747 | spill_addr = (frame ? frame->frame : 0) |
| 748 | + (rM == 12 ? 0 : mem_stack_frame_size) |
| 749 | + imm; |
| 750 | spill_reg = rN; |
| 751 | last_prologue_pc = next_pc; |
| 752 | } |
| 753 | } |
| 754 | else if (it == M |
| 755 | && ( ((instr & 0x1efc0000000LL) == 0x0eec0000000LL) |
| 756 | || ((instr & 0x1ffc8000000LL) == 0x0cec0000000LL) )) |
| 757 | { |
| 758 | /* stf.spill [rN] = fM, imm9 |
| 759 | or |
| 760 | stf.spill [rN] = fM */ |
| 761 | |
| 762 | int imm = imm9(instr); |
| 763 | int rN = (int) ((instr & 0x00007f00000LL) >> 20); |
| 764 | int fM = (int) ((instr & 0x000000fe000LL) >> 13); |
| 765 | int qp = (int) (instr & 0x0000000003fLL); |
| 766 | if (qp == 0 && rN == spill_reg && spill_addr != 0 |
| 767 | && ((2 <= fM && fM <= 5) || (16 <= fM && fM <= 31))) |
| 768 | { |
| 769 | if (do_fsr_stuff) |
| 770 | frame->saved_regs[IA64_FR0_REGNUM + fM] = spill_addr; |
| 771 | |
| 772 | if ((instr & 0x1efc0000000) == 0x0eec0000000) |
| 773 | spill_addr += imm; |
| 774 | else |
| 775 | spill_addr = 0; /* last one; must be done */ |
| 776 | last_prologue_pc = next_pc; |
| 777 | } |
| 778 | } |
| 779 | else if ((it == M && ((instr & 0x1eff8000000LL) == 0x02110000000LL)) |
| 780 | || (it == I && ((instr & 0x1eff8000000LL) == 0x00050000000LL)) ) |
| 781 | { |
| 782 | /* mov.m rN = arM |
| 783 | or |
| 784 | mov.i rN = arM */ |
| 785 | |
| 786 | int arM = (int) ((instr & 0x00007f00000LL) >> 20); |
| 787 | int rN = (int) ((instr & 0x00000001fc0LL) >> 6); |
| 788 | int qp = (int) (instr & 0x0000000003fLL); |
| 789 | if (qp == 0 && isScratch (rN) && arM == 36 /* ar.unat */) |
| 790 | { |
| 791 | /* We have something like "mov.m r3 = ar.unat". Remember the |
| 792 | r3 (or whatever) and watch for a store of this register... */ |
| 793 | unat_save_reg = rN; |
| 794 | last_prologue_pc = next_pc; |
| 795 | } |
| 796 | } |
| 797 | else if (it == I && ((instr & 0x1eff8000000LL) == 0x00198000000LL)) |
| 798 | { |
| 799 | /* mov rN = pr */ |
| 800 | int rN = (int) ((instr & 0x00000001fc0LL) >> 6); |
| 801 | int qp = (int) (instr & 0x0000000003fLL); |
| 802 | if (qp == 0 && isScratch (rN)) |
| 803 | { |
| 804 | pr_save_reg = rN; |
| 805 | last_prologue_pc = next_pc; |
| 806 | } |
| 807 | } |
| 808 | else if (it == M |
| 809 | && ( ((instr & 0x1ffc8000000LL) == 0x08cc0000000LL) |
| 810 | || ((instr & 0x1efc0000000LL) == 0x0acc0000000LL))) |
| 811 | { |
| 812 | /* st8 [rN] = rM |
| 813 | or |
| 814 | st8 [rN] = rM, imm9 */ |
| 815 | int rN = (int) ((instr & 0x00007f00000LL) >> 20); |
| 816 | int rM = (int) ((instr & 0x000000fe000LL) >> 13); |
| 817 | int qp = (int) (instr & 0x0000000003fLL); |
| 818 | if (qp == 0 && rN == spill_reg && spill_addr != 0 |
| 819 | && (rM == unat_save_reg || rM == pr_save_reg)) |
| 820 | { |
| 821 | /* We've found a spill of either the UNAT register or the PR |
| 822 | register. (Well, not exactly; what we've actually found is |
| 823 | a spill of the register that UNAT or PR was moved to). |
| 824 | Record that fact and move on... */ |
| 825 | if (rM == unat_save_reg) |
| 826 | { |
| 827 | /* Track UNAT register */ |
| 828 | if (do_fsr_stuff) |
| 829 | frame->saved_regs[IA64_UNAT_REGNUM] = spill_addr; |
| 830 | unat_save_reg = 0; |
| 831 | } |
| 832 | else |
| 833 | { |
| 834 | /* Track PR register */ |
| 835 | if (do_fsr_stuff) |
| 836 | frame->saved_regs[IA64_PR_REGNUM] = spill_addr; |
| 837 | pr_save_reg = 0; |
| 838 | } |
| 839 | if ((instr & 0x1efc0000000LL) == 0x0acc0000000LL) |
| 840 | /* st8 [rN] = rM, imm9 */ |
| 841 | spill_addr += imm9(instr); |
| 842 | else |
| 843 | spill_addr = 0; /* must be done spilling */ |
| 844 | last_prologue_pc = next_pc; |
| 845 | } |
| 846 | } |
| 847 | else if (it == M |
| 848 | && ( ((instr & 0x1ffc8000000LL) == 0x08ec0000000LL) |
| 849 | || ((instr & 0x1efc0000000LL) == 0x0aec0000000LL))) |
| 850 | { |
| 851 | /* st8.spill [rN] = rM |
| 852 | or |
| 853 | st8.spill [rN] = rM, imm9 */ |
| 854 | int rN = (int) ((instr & 0x00007f00000LL) >> 20); |
| 855 | int rM = (int) ((instr & 0x000000fe000LL) >> 13); |
| 856 | int qp = (int) (instr & 0x0000000003fLL); |
| 857 | if (qp == 0 && rN == spill_reg && 4 <= rM && rM <= 7) |
| 858 | { |
| 859 | /* We've found a spill of one of the preserved general purpose |
| 860 | regs. Record the spill address and advance the spill |
| 861 | register if appropriate. */ |
| 862 | if (do_fsr_stuff) |
| 863 | frame->saved_regs[IA64_GR0_REGNUM + rM] = spill_addr; |
| 864 | if ((instr & 0x1efc0000000LL) == 0x0aec0000000LL) |
| 865 | /* st8.spill [rN] = rM, imm9 */ |
| 866 | spill_addr += imm9(instr); |
| 867 | else |
| 868 | spill_addr = 0; /* Done spilling */ |
| 869 | last_prologue_pc = next_pc; |
| 870 | } |
| 871 | } |
| 872 | else if (it == B || ((instr & 0x3fLL) != 0LL)) |
| 873 | break; |
| 874 | |
| 875 | pc = next_pc; |
| 876 | } |
| 877 | |
| 878 | if (do_fsr_stuff) { |
| 879 | int i; |
| 880 | CORE_ADDR addr; |
| 881 | |
| 882 | for (i = 0, addr = frame->extra_info->bsp; |
| 883 | i < frame->extra_info->sof; |
| 884 | i++, addr += 8) |
| 885 | { |
| 886 | if (IS_NaT_COLLECTION_ADDR (addr)) |
| 887 | { |
| 888 | addr += 8; |
| 889 | } |
| 890 | frame->saved_regs[IA64_GR32_REGNUM + i] = addr; |
| 891 | |
| 892 | if (i+32 == cfm_reg) |
| 893 | frame->saved_regs[IA64_CFM_REGNUM] = addr; |
| 894 | if (i+32 == ret_reg) |
| 895 | frame->saved_regs[IA64_VRAP_REGNUM] = addr; |
| 896 | if (i+32 == fp_reg) |
| 897 | frame->saved_regs[IA64_VFP_REGNUM] = addr; |
| 898 | } |
| 899 | } |
| 900 | |
| 901 | if (frame && frame->extra_info) { |
| 902 | frame->extra_info->after_prologue = last_prologue_pc; |
| 903 | frame->extra_info->mem_stack_frame_size = mem_stack_frame_size; |
| 904 | frame->extra_info->fp_reg = fp_reg; |
| 905 | } |
| 906 | |
| 907 | return last_prologue_pc; |
| 908 | } |
| 909 | |
| 910 | CORE_ADDR |
| 911 | ia64_skip_prologue (CORE_ADDR pc) |
| 912 | { |
| 913 | return examine_prologue (pc, pc+1024, 0); |
| 914 | } |
| 915 | |
| 916 | void |
| 917 | ia64_frame_init_saved_regs (struct frame_info *frame) |
| 918 | { |
| 919 | CORE_ADDR func_start; |
| 920 | |
| 921 | if (frame->saved_regs) |
| 922 | return; |
| 923 | |
| 924 | func_start = get_pc_function_start (frame->pc); |
| 925 | examine_prologue (func_start, frame->pc, frame); |
| 926 | } |
| 927 | |
| 928 | static CORE_ADDR |
| 929 | ia64_find_saved_register (frame, regnum) |
| 930 | struct frame_info *frame; |
| 931 | int regnum; |
| 932 | { |
| 933 | register CORE_ADDR addr = 0; |
| 934 | |
| 935 | if ((IA64_GR32_REGNUM <= regnum && regnum <= IA64_GR127_REGNUM) |
| 936 | || regnum == IA64_VFP_REGNUM |
| 937 | || regnum == IA64_VRAP_REGNUM) |
| 938 | { |
| 939 | FRAME_INIT_SAVED_REGS (frame); |
| 940 | return frame->saved_regs[regnum]; |
| 941 | } |
| 942 | else if (regnum == IA64_IP_REGNUM && frame->next) |
| 943 | { |
| 944 | FRAME_INIT_SAVED_REGS (frame->next); |
| 945 | return frame->next->saved_regs[IA64_VRAP_REGNUM]; |
| 946 | } |
| 947 | else |
| 948 | { |
| 949 | struct frame_info *frame1 = NULL; |
| 950 | while (1) |
| 951 | { |
| 952 | QUIT; |
| 953 | frame1 = get_prev_frame (frame1); |
| 954 | if (frame1 == 0 || frame1 == frame) |
| 955 | break; |
| 956 | FRAME_INIT_SAVED_REGS (frame1); |
| 957 | if (frame1->saved_regs[regnum]) |
| 958 | addr = frame1->saved_regs[regnum]; |
| 959 | } |
| 960 | } |
| 961 | |
| 962 | return addr; |
| 963 | } |
| 964 | |
| 965 | void |
| 966 | ia64_get_saved_register (char *raw_buffer, |
| 967 | int *optimized, |
| 968 | CORE_ADDR *addrp, |
| 969 | struct frame_info *frame, |
| 970 | int regnum, |
| 971 | enum lval_type *lval) |
| 972 | { |
| 973 | CORE_ADDR addr; |
| 974 | |
| 975 | if (!target_has_registers) |
| 976 | error ("No registers."); |
| 977 | |
| 978 | if (optimized != NULL) |
| 979 | *optimized = 0; |
| 980 | addr = ia64_find_saved_register (frame, regnum); |
| 981 | if (addr != 0) |
| 982 | { |
| 983 | if (lval != NULL) |
| 984 | *lval = lval_memory; |
| 985 | if (regnum == SP_REGNUM) |
| 986 | { |
| 987 | if (raw_buffer != NULL) |
| 988 | { |
| 989 | /* Put it back in target format. */ |
| 990 | store_address (raw_buffer, REGISTER_RAW_SIZE (regnum), (LONGEST) addr); |
| 991 | } |
| 992 | if (addrp != NULL) |
| 993 | *addrp = 0; |
| 994 | return; |
| 995 | } |
| 996 | if (raw_buffer != NULL) |
| 997 | read_memory (addr, raw_buffer, REGISTER_RAW_SIZE (regnum)); |
| 998 | } |
| 999 | else if (IA64_GR32_REGNUM <= regnum && regnum <= IA64_GR127_REGNUM) |
| 1000 | { |
| 1001 | /* r32 - r127 must be fetchable via memory. If they aren't, |
| 1002 | then the register is unavailable */ |
| 1003 | addr = 0; |
| 1004 | if (lval != NULL) |
| 1005 | *lval = not_lval; |
| 1006 | memset (raw_buffer, 0, REGISTER_RAW_SIZE (regnum)); |
| 1007 | } |
| 1008 | else if (regnum == IA64_IP_REGNUM) |
| 1009 | { |
| 1010 | CORE_ADDR pc; |
| 1011 | if (frame->next) |
| 1012 | { |
| 1013 | /* This case will normally be handled above, except when it's |
| 1014 | frameless or we haven't advanced far enough into the prologue |
| 1015 | of the top frame to save the register. */ |
| 1016 | addr = REGISTER_BYTE (regnum); |
| 1017 | if (lval != NULL) |
| 1018 | *lval = lval_register; |
| 1019 | pc = ia64_saved_pc_after_call (frame); |
| 1020 | } |
| 1021 | else |
| 1022 | { |
| 1023 | addr = 0; |
| 1024 | if (lval != NULL) |
| 1025 | *lval = not_lval; |
| 1026 | pc = read_pc (); |
| 1027 | } |
| 1028 | store_address (raw_buffer, REGISTER_RAW_SIZE (IA64_IP_REGNUM), pc); |
| 1029 | } |
| 1030 | else if (regnum == SP_REGNUM && frame->next) |
| 1031 | { |
| 1032 | /* Handle SP values for all frames but the topmost. */ |
| 1033 | addr = 0; |
| 1034 | if (lval != NULL) |
| 1035 | *lval = not_lval; |
| 1036 | store_address (raw_buffer, REGISTER_RAW_SIZE (regnum), frame->frame); |
| 1037 | } |
| 1038 | else if (regnum == IA64_BSP_REGNUM) |
| 1039 | { |
| 1040 | addr = 0; |
| 1041 | if (lval != NULL) |
| 1042 | *lval = not_lval; |
| 1043 | store_address (raw_buffer, REGISTER_RAW_SIZE (regnum), |
| 1044 | frame->extra_info->bsp); |
| 1045 | } |
| 1046 | else if (regnum == IA64_VFP_REGNUM) |
| 1047 | { |
| 1048 | /* If the function in question uses an automatic register (r32-r127) |
| 1049 | for the frame pointer, it'll be found by ia64_find_saved_register() |
| 1050 | above. If the function lacks one of these frame pointers, we can |
| 1051 | still provide a value since we know the size of the frame */ |
| 1052 | CORE_ADDR vfp = frame->frame + frame->extra_info->mem_stack_frame_size; |
| 1053 | addr = 0; |
| 1054 | if (lval != NULL) |
| 1055 | *lval = not_lval; |
| 1056 | store_address (raw_buffer, REGISTER_RAW_SIZE (IA64_VFP_REGNUM), vfp); |
| 1057 | } |
| 1058 | else if (IA64_PR0_REGNUM <= regnum && regnum <= IA64_PR63_REGNUM) |
| 1059 | { |
| 1060 | char pr_raw_buffer[MAX_REGISTER_RAW_SIZE]; |
| 1061 | int pr_optim; |
| 1062 | enum lval_type pr_lval; |
| 1063 | CORE_ADDR pr_addr; |
| 1064 | int prN_val; |
| 1065 | ia64_get_saved_register (pr_raw_buffer, &pr_optim, &pr_addr, |
| 1066 | frame, IA64_PR_REGNUM, &pr_lval); |
| 1067 | prN_val = extract_bit_field ((unsigned char *) pr_raw_buffer, |
| 1068 | regnum - IA64_PR0_REGNUM, 1); |
| 1069 | store_unsigned_integer (raw_buffer, REGISTER_RAW_SIZE (regnum), prN_val); |
| 1070 | addr = 0; |
| 1071 | if (lval != NULL) |
| 1072 | *lval = not_lval; |
| 1073 | } |
| 1074 | else if (IA64_NAT0_REGNUM <= regnum && regnum <= IA64_NAT31_REGNUM) |
| 1075 | { |
| 1076 | char unat_raw_buffer[MAX_REGISTER_RAW_SIZE]; |
| 1077 | int unat_optim; |
| 1078 | enum lval_type unat_lval; |
| 1079 | CORE_ADDR unat_addr; |
| 1080 | int unatN_val; |
| 1081 | ia64_get_saved_register (unat_raw_buffer, &unat_optim, &unat_addr, |
| 1082 | frame, IA64_UNAT_REGNUM, &unat_lval); |
| 1083 | unatN_val = extract_bit_field ((unsigned char *) unat_raw_buffer, |
| 1084 | regnum - IA64_NAT0_REGNUM, 1); |
| 1085 | store_unsigned_integer (raw_buffer, REGISTER_RAW_SIZE (regnum), |
| 1086 | unatN_val); |
| 1087 | addr = 0; |
| 1088 | if (lval != NULL) |
| 1089 | *lval = not_lval; |
| 1090 | } |
| 1091 | else if (IA64_NAT32_REGNUM <= regnum && regnum <= IA64_NAT127_REGNUM) |
| 1092 | { |
| 1093 | int natval = 0; |
| 1094 | /* Find address of general register corresponding to nat bit we're |
| 1095 | interested in. */ |
| 1096 | CORE_ADDR gr_addr = |
| 1097 | ia64_find_saved_register (frame, |
| 1098 | regnum - IA64_NAT0_REGNUM + IA64_GR0_REGNUM); |
| 1099 | if (gr_addr) |
| 1100 | { |
| 1101 | /* Compute address of nat collection bits */ |
| 1102 | CORE_ADDR nat_addr = gr_addr | 0x1f8; |
| 1103 | CORE_ADDR bsp = read_register (IA64_BSP_REGNUM); |
| 1104 | CORE_ADDR nat_collection; |
| 1105 | int nat_bit; |
| 1106 | /* If our nat collection address is bigger than bsp, we have to get |
| 1107 | the nat collection from rnat. Otherwise, we fetch the nat |
| 1108 | collection from the computed address. */ |
| 1109 | if (nat_addr >= bsp) |
| 1110 | nat_collection = read_register (IA64_RNAT_REGNUM); |
| 1111 | else |
| 1112 | nat_collection = read_memory_integer (nat_addr, 8); |
| 1113 | nat_bit = (gr_addr >> 3) & 0x3f; |
| 1114 | natval = (nat_collection >> nat_bit) & 1; |
| 1115 | } |
| 1116 | store_unsigned_integer (raw_buffer, REGISTER_RAW_SIZE (regnum), natval); |
| 1117 | addr = 0; |
| 1118 | if (lval != NULL) |
| 1119 | *lval = not_lval; |
| 1120 | } |
| 1121 | else |
| 1122 | { |
| 1123 | if (lval != NULL) |
| 1124 | *lval = lval_register; |
| 1125 | addr = REGISTER_BYTE (regnum); |
| 1126 | if (raw_buffer != NULL) |
| 1127 | read_register_gen (regnum, raw_buffer); |
| 1128 | } |
| 1129 | if (addrp != NULL) |
| 1130 | *addrp = addr; |
| 1131 | } |
| 1132 | |
| 1133 | /* Should we use EXTRACT_STRUCT_VALUE_ADDRESS instead of |
| 1134 | EXTRACT_RETURN_VALUE? GCC_P is true if compiled with gcc |
| 1135 | and TYPE is the type (which is known to be struct, union or array). */ |
| 1136 | int |
| 1137 | ia64_use_struct_convention (int gcc_p, struct type *type) |
| 1138 | { |
| 1139 | struct type *float_elt_type; |
| 1140 | |
| 1141 | /* HFAs are structures (or arrays) consisting entirely of floating |
| 1142 | point values of the same length. Up to 8 of these are returned |
| 1143 | in registers. Don't use the struct convention when this is the |
| 1144 | case. */ |
| 1145 | float_elt_type = is_float_or_hfa_type (type); |
| 1146 | if (float_elt_type != NULL |
| 1147 | && TYPE_LENGTH (type) / TYPE_LENGTH (float_elt_type) <= 8) |
| 1148 | return 0; |
| 1149 | |
| 1150 | /* Other structs of length 32 or less are returned in r8-r11. |
| 1151 | Don't use the struct convention for those either. */ |
| 1152 | return TYPE_LENGTH (type) > 32; |
| 1153 | } |
| 1154 | |
| 1155 | void |
| 1156 | ia64_extract_return_value (struct type *type, char *regbuf, char *valbuf) |
| 1157 | { |
| 1158 | struct type *float_elt_type; |
| 1159 | |
| 1160 | float_elt_type = is_float_or_hfa_type (type); |
| 1161 | if (float_elt_type != NULL) |
| 1162 | { |
| 1163 | int offset = 0; |
| 1164 | int regnum = IA64_FR8_REGNUM; |
| 1165 | int n = TYPE_LENGTH (type) / TYPE_LENGTH (float_elt_type); |
| 1166 | |
| 1167 | while (n-- > 0) |
| 1168 | { |
| 1169 | ia64_register_convert_to_virtual (regnum, float_elt_type, |
| 1170 | ®buf[REGISTER_BYTE (regnum)], valbuf + offset); |
| 1171 | offset += TYPE_LENGTH (float_elt_type); |
| 1172 | regnum++; |
| 1173 | } |
| 1174 | } |
| 1175 | else |
| 1176 | memcpy (valbuf, ®buf[REGISTER_BYTE (IA64_GR8_REGNUM)], |
| 1177 | TYPE_LENGTH (type)); |
| 1178 | } |
| 1179 | |
| 1180 | /* FIXME: Turn this into a stack of some sort. Unfortunately, something |
| 1181 | like this is necessary though since the IA-64 calling conventions specify |
| 1182 | that r8 is not preserved. */ |
| 1183 | static CORE_ADDR struct_return_address; |
| 1184 | |
| 1185 | CORE_ADDR |
| 1186 | ia64_extract_struct_value_address (char *regbuf) |
| 1187 | { |
| 1188 | /* FIXME: See above. */ |
| 1189 | return struct_return_address; |
| 1190 | } |
| 1191 | |
| 1192 | void |
| 1193 | ia64_store_struct_return (CORE_ADDR addr, CORE_ADDR sp) |
| 1194 | { |
| 1195 | /* FIXME: See above. */ |
| 1196 | /* Note that most of the work was done in ia64_push_arguments() */ |
| 1197 | struct_return_address = addr; |
| 1198 | } |
| 1199 | |
| 1200 | int |
| 1201 | ia64_frameless_function_invocation (struct frame_info *frame) |
| 1202 | { |
| 1203 | /* FIXME: Implement */ |
| 1204 | return 0; |
| 1205 | } |
| 1206 | |
| 1207 | CORE_ADDR |
| 1208 | ia64_saved_pc_after_call (struct frame_info *frame) |
| 1209 | { |
| 1210 | return read_register (IA64_BR0_REGNUM); |
| 1211 | } |
| 1212 | |
| 1213 | CORE_ADDR |
| 1214 | ia64_frame_args_address (struct frame_info *frame) |
| 1215 | { |
| 1216 | /* frame->frame points at the SP for this frame; But we want the start |
| 1217 | of the frame, not the end. Calling frame chain will get his for us. */ |
| 1218 | return ia64_frame_chain (frame); |
| 1219 | } |
| 1220 | |
| 1221 | CORE_ADDR |
| 1222 | ia64_frame_locals_address (struct frame_info *frame) |
| 1223 | { |
| 1224 | /* frame->frame points at the SP for this frame; But we want the start |
| 1225 | of the frame, not the end. Calling frame chain will get his for us. */ |
| 1226 | return ia64_frame_chain (frame); |
| 1227 | } |
| 1228 | |
| 1229 | void |
| 1230 | ia64_init_extra_frame_info (int fromleaf, struct frame_info *frame) |
| 1231 | { |
| 1232 | CORE_ADDR bsp, cfm; |
| 1233 | |
| 1234 | frame->extra_info = (struct frame_extra_info *) |
| 1235 | frame_obstack_alloc (sizeof (struct frame_extra_info)); |
| 1236 | |
| 1237 | if (frame->next == 0) |
| 1238 | { |
| 1239 | bsp = read_register (IA64_BSP_REGNUM); |
| 1240 | cfm = read_register (IA64_CFM_REGNUM); |
| 1241 | |
| 1242 | } |
| 1243 | else |
| 1244 | { |
| 1245 | struct frame_info *frn = frame->next; |
| 1246 | |
| 1247 | FRAME_INIT_SAVED_REGS (frn); |
| 1248 | |
| 1249 | if (frn->saved_regs[IA64_CFM_REGNUM] != 0) |
| 1250 | cfm = read_memory_integer (frn->saved_regs[IA64_CFM_REGNUM], 8); |
| 1251 | else |
| 1252 | cfm = read_register (IA64_CFM_REGNUM); |
| 1253 | |
| 1254 | bsp = frn->extra_info->bsp; |
| 1255 | } |
| 1256 | frame->extra_info->cfm = cfm; |
| 1257 | frame->extra_info->sof = cfm & 0x7f; |
| 1258 | frame->extra_info->sol = (cfm >> 7) & 0x7f; |
| 1259 | if (frame->next == 0) |
| 1260 | frame->extra_info->bsp = rse_address_add (bsp, -frame->extra_info->sof); |
| 1261 | else |
| 1262 | frame->extra_info->bsp = rse_address_add (bsp, -frame->extra_info->sol); |
| 1263 | |
| 1264 | frame->extra_info->after_prologue = 0; |
| 1265 | frame->extra_info->mem_stack_frame_size = -1; /* Not yet determined */ |
| 1266 | frame->extra_info->fp_reg = 0; |
| 1267 | } |
| 1268 | |
| 1269 | static int |
| 1270 | is_float_or_hfa_type_recurse (struct type *t, struct type **etp) |
| 1271 | { |
| 1272 | switch (TYPE_CODE (t)) |
| 1273 | { |
| 1274 | case TYPE_CODE_FLT: |
| 1275 | if (*etp) |
| 1276 | return TYPE_LENGTH (*etp) == TYPE_LENGTH (t); |
| 1277 | else |
| 1278 | { |
| 1279 | *etp = t; |
| 1280 | return 1; |
| 1281 | } |
| 1282 | break; |
| 1283 | case TYPE_CODE_ARRAY: |
| 1284 | return is_float_or_hfa_type_recurse (TYPE_TARGET_TYPE (t), etp); |
| 1285 | break; |
| 1286 | case TYPE_CODE_STRUCT: |
| 1287 | { |
| 1288 | int i; |
| 1289 | |
| 1290 | for (i = 0; i < TYPE_NFIELDS (t); i++) |
| 1291 | if (!is_float_or_hfa_type_recurse (TYPE_FIELD_TYPE (t, i), etp)) |
| 1292 | return 0; |
| 1293 | return 1; |
| 1294 | } |
| 1295 | break; |
| 1296 | default: |
| 1297 | return 0; |
| 1298 | break; |
| 1299 | } |
| 1300 | } |
| 1301 | |
| 1302 | /* Determine if the given type is one of the floating point types or |
| 1303 | and HFA (which is a struct, array, or combination thereof whose |
| 1304 | bottom-most elements are all of the same floating point type.) */ |
| 1305 | |
| 1306 | static struct type * |
| 1307 | is_float_or_hfa_type (struct type *t) |
| 1308 | { |
| 1309 | struct type *et = 0; |
| 1310 | |
| 1311 | return is_float_or_hfa_type_recurse (t, &et) ? et : 0; |
| 1312 | } |
| 1313 | |
| 1314 | |
| 1315 | /* Attempt to find (and return) the global pointer for the given |
| 1316 | function. |
| 1317 | |
| 1318 | This is a rather nasty bit of code searchs for the .dynamic section |
| 1319 | in the objfile corresponding to the pc of the function we're trying |
| 1320 | to call. Once it finds the addresses at which the .dynamic section |
| 1321 | lives in the child process, it scans the Elf64_Dyn entries for a |
| 1322 | DT_PLTGOT tag. If it finds one of these, the corresponding |
| 1323 | d_un.d_ptr value is the global pointer. */ |
| 1324 | |
| 1325 | static CORE_ADDR |
| 1326 | find_global_pointer (CORE_ADDR faddr) |
| 1327 | { |
| 1328 | struct partial_symtab *pst; |
| 1329 | |
| 1330 | pst = find_pc_psymtab (faddr); |
| 1331 | if (pst != NULL) |
| 1332 | { |
| 1333 | struct obj_section *osect; |
| 1334 | |
| 1335 | ALL_OBJFILE_OSECTIONS (pst->objfile, osect) |
| 1336 | { |
| 1337 | if (strcmp (osect->the_bfd_section->name, ".dynamic") == 0) |
| 1338 | break; |
| 1339 | } |
| 1340 | |
| 1341 | if (osect < pst->objfile->sections_end) |
| 1342 | { |
| 1343 | CORE_ADDR addr; |
| 1344 | |
| 1345 | addr = osect->addr; |
| 1346 | while (addr < osect->endaddr) |
| 1347 | { |
| 1348 | int status; |
| 1349 | LONGEST tag; |
| 1350 | char buf[8]; |
| 1351 | |
| 1352 | status = target_read_memory (addr, buf, sizeof (buf)); |
| 1353 | if (status != 0) |
| 1354 | break; |
| 1355 | tag = extract_signed_integer (buf, sizeof (buf)); |
| 1356 | |
| 1357 | if (tag == DT_PLTGOT) |
| 1358 | { |
| 1359 | CORE_ADDR global_pointer; |
| 1360 | |
| 1361 | status = target_read_memory (addr + 8, buf, sizeof (buf)); |
| 1362 | if (status != 0) |
| 1363 | break; |
| 1364 | global_pointer = extract_address (buf, sizeof (buf)); |
| 1365 | |
| 1366 | /* The payoff... */ |
| 1367 | return global_pointer; |
| 1368 | } |
| 1369 | |
| 1370 | if (tag == DT_NULL) |
| 1371 | break; |
| 1372 | |
| 1373 | addr += 16; |
| 1374 | } |
| 1375 | } |
| 1376 | } |
| 1377 | return 0; |
| 1378 | } |
| 1379 | |
| 1380 | /* Given a function's address, attempt to find (and return) the |
| 1381 | corresponding (canonical) function descriptor. Return 0 if |
| 1382 | not found. */ |
| 1383 | static CORE_ADDR |
| 1384 | find_extant_func_descr (CORE_ADDR faddr) |
| 1385 | { |
| 1386 | struct partial_symtab *pst; |
| 1387 | struct obj_section *osect; |
| 1388 | |
| 1389 | /* Return early if faddr is already a function descriptor */ |
| 1390 | osect = find_pc_section (faddr); |
| 1391 | if (osect && strcmp (osect->the_bfd_section->name, ".opd") == 0) |
| 1392 | return faddr; |
| 1393 | |
| 1394 | pst = find_pc_psymtab (faddr); |
| 1395 | if (pst != NULL) |
| 1396 | { |
| 1397 | ALL_OBJFILE_OSECTIONS (pst->objfile, osect) |
| 1398 | { |
| 1399 | if (strcmp (osect->the_bfd_section->name, ".opd") == 0) |
| 1400 | break; |
| 1401 | } |
| 1402 | |
| 1403 | if (osect < pst->objfile->sections_end) |
| 1404 | { |
| 1405 | CORE_ADDR addr; |
| 1406 | |
| 1407 | addr = osect->addr; |
| 1408 | while (addr < osect->endaddr) |
| 1409 | { |
| 1410 | int status; |
| 1411 | LONGEST faddr2; |
| 1412 | char buf[8]; |
| 1413 | |
| 1414 | status = target_read_memory (addr, buf, sizeof (buf)); |
| 1415 | if (status != 0) |
| 1416 | break; |
| 1417 | faddr2 = extract_signed_integer (buf, sizeof (buf)); |
| 1418 | |
| 1419 | if (faddr == faddr2) |
| 1420 | return addr; |
| 1421 | |
| 1422 | addr += 16; |
| 1423 | } |
| 1424 | } |
| 1425 | } |
| 1426 | return 0; |
| 1427 | } |
| 1428 | |
| 1429 | /* Attempt to find a function descriptor corresponding to the |
| 1430 | given address. If none is found, construct one on the |
| 1431 | stack using the address at fdaptr */ |
| 1432 | |
| 1433 | static CORE_ADDR |
| 1434 | find_func_descr (CORE_ADDR faddr, CORE_ADDR *fdaptr) |
| 1435 | { |
| 1436 | CORE_ADDR fdesc; |
| 1437 | |
| 1438 | fdesc = find_extant_func_descr (faddr); |
| 1439 | |
| 1440 | if (fdesc == 0) |
| 1441 | { |
| 1442 | CORE_ADDR global_pointer; |
| 1443 | char buf[16]; |
| 1444 | |
| 1445 | fdesc = *fdaptr; |
| 1446 | *fdaptr += 16; |
| 1447 | |
| 1448 | global_pointer = find_global_pointer (faddr); |
| 1449 | |
| 1450 | if (global_pointer == 0) |
| 1451 | global_pointer = read_register (IA64_GR1_REGNUM); |
| 1452 | |
| 1453 | store_address (buf, 8, faddr); |
| 1454 | store_address (buf + 8, 8, global_pointer); |
| 1455 | |
| 1456 | write_memory (fdesc, buf, 16); |
| 1457 | } |
| 1458 | |
| 1459 | return fdesc; |
| 1460 | } |
| 1461 | |
| 1462 | CORE_ADDR |
| 1463 | ia64_push_arguments (int nargs, value_ptr *args, CORE_ADDR sp, |
| 1464 | int struct_return, CORE_ADDR struct_addr) |
| 1465 | { |
| 1466 | int argno; |
| 1467 | value_ptr arg; |
| 1468 | struct type *type; |
| 1469 | int len, argoffset; |
| 1470 | int nslots, rseslots, memslots, slotnum, nfuncargs; |
| 1471 | int floatreg; |
| 1472 | CORE_ADDR bsp, cfm, pfs, new_bsp, funcdescaddr; |
| 1473 | |
| 1474 | nslots = 0; |
| 1475 | nfuncargs = 0; |
| 1476 | /* Count the number of slots needed for the arguments */ |
| 1477 | for (argno = 0; argno < nargs; argno++) |
| 1478 | { |
| 1479 | arg = args[argno]; |
| 1480 | type = check_typedef (VALUE_TYPE (arg)); |
| 1481 | len = TYPE_LENGTH (type); |
| 1482 | |
| 1483 | /* FIXME: This is crude and it is wrong (IMO), but it matches |
| 1484 | what gcc does, I think. */ |
| 1485 | if (len > 8 && (nslots & 1)) |
| 1486 | nslots++; |
| 1487 | |
| 1488 | if (TYPE_CODE (type) == TYPE_CODE_FUNC) |
| 1489 | nfuncargs++; |
| 1490 | |
| 1491 | nslots += (len + 7) / 8; |
| 1492 | } |
| 1493 | |
| 1494 | /* Divvy up the slots between the RSE and the memory stack */ |
| 1495 | rseslots = (nslots > 8) ? 8 : nslots; |
| 1496 | memslots = nslots - rseslots; |
| 1497 | |
| 1498 | /* Allocate a new RSE frame */ |
| 1499 | cfm = read_register (IA64_CFM_REGNUM); |
| 1500 | |
| 1501 | bsp = read_register (IA64_BSP_REGNUM); |
| 1502 | bsp = rse_address_add (bsp, cfm & 0x7f); |
| 1503 | new_bsp = rse_address_add (bsp, rseslots); |
| 1504 | write_register (IA64_BSP_REGNUM, new_bsp); |
| 1505 | |
| 1506 | pfs = read_register (IA64_PFS_REGNUM); |
| 1507 | pfs &= 0xc000000000000000LL; |
| 1508 | pfs |= (cfm & 0xffffffffffffLL); |
| 1509 | write_register (IA64_PFS_REGNUM, pfs); |
| 1510 | |
| 1511 | cfm &= 0xc000000000000000LL; |
| 1512 | cfm |= rseslots; |
| 1513 | write_register (IA64_CFM_REGNUM, cfm); |
| 1514 | |
| 1515 | /* We will attempt to find function descriptors in the .opd segment, |
| 1516 | but if we can't we'll construct them ourselves. That being the |
| 1517 | case, we'll need to reserve space on the stack for them. */ |
| 1518 | funcdescaddr = sp - nfuncargs * 16; |
| 1519 | funcdescaddr &= ~0xfLL; |
| 1520 | |
| 1521 | /* Adjust the stack pointer to it's new value. The calling conventions |
| 1522 | require us to have 16 bytes of scratch, plus whatever space is |
| 1523 | necessary for the memory slots and our function descriptors */ |
| 1524 | sp = sp - 16 - (memslots + nfuncargs) * 8; |
| 1525 | sp &= ~0xfLL; /* Maintain 16 byte alignment */ |
| 1526 | |
| 1527 | /* Place the arguments where they belong. The arguments will be |
| 1528 | either placed in the RSE backing store or on the memory stack. |
| 1529 | In addition, floating point arguments or HFAs are placed in |
| 1530 | floating point registers. */ |
| 1531 | slotnum = 0; |
| 1532 | floatreg = IA64_FR8_REGNUM; |
| 1533 | for (argno = 0; argno < nargs; argno++) |
| 1534 | { |
| 1535 | struct type *float_elt_type; |
| 1536 | |
| 1537 | arg = args[argno]; |
| 1538 | type = check_typedef (VALUE_TYPE (arg)); |
| 1539 | len = TYPE_LENGTH (type); |
| 1540 | |
| 1541 | /* Special handling for function parameters */ |
| 1542 | if (len == 8 |
| 1543 | && TYPE_CODE (type) == TYPE_CODE_PTR |
| 1544 | && TYPE_CODE (TYPE_TARGET_TYPE (type)) == TYPE_CODE_FUNC) |
| 1545 | { |
| 1546 | char val_buf[8]; |
| 1547 | |
| 1548 | store_address (val_buf, 8, |
| 1549 | find_func_descr (extract_address (VALUE_CONTENTS (arg), 8), |
| 1550 | &funcdescaddr)); |
| 1551 | if (slotnum < rseslots) |
| 1552 | write_memory (rse_address_add (bsp, slotnum), val_buf, 8); |
| 1553 | else |
| 1554 | write_memory (sp + 16 + 8 * (slotnum - rseslots), val_buf, 8); |
| 1555 | slotnum++; |
| 1556 | continue; |
| 1557 | } |
| 1558 | |
| 1559 | /* Normal slots */ |
| 1560 | if (len > 8 && (slotnum & 1)) |
| 1561 | slotnum++; |
| 1562 | argoffset = 0; |
| 1563 | while (len > 0) |
| 1564 | { |
| 1565 | char val_buf[8]; |
| 1566 | |
| 1567 | memset (val_buf, 0, 8); |
| 1568 | memcpy (val_buf, VALUE_CONTENTS (arg) + argoffset, (len > 8) ? 8 : len); |
| 1569 | |
| 1570 | if (slotnum < rseslots) |
| 1571 | write_memory (rse_address_add (bsp, slotnum), val_buf, 8); |
| 1572 | else |
| 1573 | write_memory (sp + 16 + 8 * (slotnum - rseslots), val_buf, 8); |
| 1574 | |
| 1575 | argoffset += 8; |
| 1576 | len -= 8; |
| 1577 | slotnum++; |
| 1578 | } |
| 1579 | |
| 1580 | /* Handle floating point types (including HFAs) */ |
| 1581 | float_elt_type = is_float_or_hfa_type (type); |
| 1582 | if (float_elt_type != NULL) |
| 1583 | { |
| 1584 | argoffset = 0; |
| 1585 | len = TYPE_LENGTH (type); |
| 1586 | while (len > 0 && floatreg < IA64_FR16_REGNUM) |
| 1587 | { |
| 1588 | ia64_register_convert_to_raw ( |
| 1589 | float_elt_type, |
| 1590 | floatreg, |
| 1591 | VALUE_CONTENTS (arg) + argoffset, |
| 1592 | ®isters[REGISTER_BYTE (floatreg)]); |
| 1593 | floatreg++; |
| 1594 | argoffset += TYPE_LENGTH (float_elt_type); |
| 1595 | len -= TYPE_LENGTH (float_elt_type); |
| 1596 | } |
| 1597 | } |
| 1598 | } |
| 1599 | |
| 1600 | /* Store the struct return value in r8 if necessary. */ |
| 1601 | if (struct_return) |
| 1602 | { |
| 1603 | store_address (®isters[REGISTER_BYTE (IA64_GR8_REGNUM)], |
| 1604 | REGISTER_RAW_SIZE (IA64_GR8_REGNUM), |
| 1605 | struct_addr); |
| 1606 | } |
| 1607 | |
| 1608 | /* Sync gdb's idea of what the registers are with the target. */ |
| 1609 | target_store_registers (-1); |
| 1610 | |
| 1611 | /* FIXME: This doesn't belong here! Instead, SAVE_DUMMY_FRAME_TOS needs |
| 1612 | to be defined to call generic_save_dummy_frame_tos(). But at the |
| 1613 | time of this writing, SAVE_DUMMY_FRAME_TOS wasn't gdbarch'd, so |
| 1614 | I chose to put this call here instead of using the old mechanisms. |
| 1615 | Once SAVE_DUMMY_FRAME_TOS is gdbarch'd, all we need to do is add the |
| 1616 | line |
| 1617 | |
| 1618 | set_gdbarch_save_dummy_frame_tos (gdbarch, generic_save_dummy_frame_tos); |
| 1619 | |
| 1620 | to ia64_gdbarch_init() and remove the line below. */ |
| 1621 | generic_save_dummy_frame_tos (sp); |
| 1622 | |
| 1623 | return sp; |
| 1624 | } |
| 1625 | |
| 1626 | CORE_ADDR |
| 1627 | ia64_push_return_address (CORE_ADDR pc, CORE_ADDR sp) |
| 1628 | { |
| 1629 | CORE_ADDR global_pointer = find_global_pointer (pc); |
| 1630 | |
| 1631 | if (global_pointer != 0) |
| 1632 | write_register (IA64_GR1_REGNUM, global_pointer); |
| 1633 | |
| 1634 | write_register (IA64_BR0_REGNUM, CALL_DUMMY_ADDRESS ()); |
| 1635 | return sp; |
| 1636 | } |
| 1637 | |
| 1638 | void |
| 1639 | ia64_store_return_value (struct type *type, char *valbuf) |
| 1640 | { |
| 1641 | if (TYPE_CODE (type) == TYPE_CODE_FLT) |
| 1642 | { |
| 1643 | ia64_register_convert_to_raw (type, IA64_FR8_REGNUM, valbuf, |
| 1644 | ®isters[REGISTER_BYTE (IA64_FR8_REGNUM)]); |
| 1645 | target_store_registers (IA64_FR8_REGNUM); |
| 1646 | } |
| 1647 | else |
| 1648 | write_register_bytes (REGISTER_BYTE (IA64_GR8_REGNUM), |
| 1649 | valbuf, TYPE_LENGTH (type)); |
| 1650 | } |
| 1651 | |
| 1652 | void |
| 1653 | ia64_pop_frame (void) |
| 1654 | { |
| 1655 | generic_pop_current_frame (ia64_pop_frame_regular); |
| 1656 | } |
| 1657 | |
| 1658 | static void |
| 1659 | ia64_pop_frame_regular (struct frame_info *frame) |
| 1660 | { |
| 1661 | int regno; |
| 1662 | CORE_ADDR bsp, cfm, pfs; |
| 1663 | |
| 1664 | FRAME_INIT_SAVED_REGS (frame); |
| 1665 | |
| 1666 | for (regno = 0; regno < ia64_num_regs; regno++) |
| 1667 | { |
| 1668 | if (frame->saved_regs[regno] |
| 1669 | && (!(IA64_GR32_REGNUM <= regno && regno <= IA64_GR127_REGNUM)) |
| 1670 | && regno != pc_regnum |
| 1671 | && regno != sp_regnum |
| 1672 | && regno != IA64_PFS_REGNUM |
| 1673 | && regno != IA64_CFM_REGNUM |
| 1674 | && regno != IA64_BSP_REGNUM |
| 1675 | && regno != IA64_BSPSTORE_REGNUM) |
| 1676 | { |
| 1677 | write_register (regno, |
| 1678 | read_memory_integer (frame->saved_regs[regno], |
| 1679 | REGISTER_RAW_SIZE (regno))); |
| 1680 | } |
| 1681 | } |
| 1682 | |
| 1683 | write_register (sp_regnum, FRAME_CHAIN (frame)); |
| 1684 | write_pc (FRAME_SAVED_PC (frame)); |
| 1685 | |
| 1686 | cfm = read_register (IA64_CFM_REGNUM); |
| 1687 | |
| 1688 | if (frame->saved_regs[IA64_PFS_REGNUM]) |
| 1689 | { |
| 1690 | pfs = read_memory_integer (frame->saved_regs[IA64_PFS_REGNUM], |
| 1691 | REGISTER_RAW_SIZE (IA64_PFS_REGNUM)); |
| 1692 | } |
| 1693 | else |
| 1694 | pfs = read_register (IA64_PFS_REGNUM); |
| 1695 | |
| 1696 | /* Compute the new bsp by *adding* the difference between the |
| 1697 | size of the frame and the size of the locals (both wrt the |
| 1698 | frame that we're going back to). This seems kind of strange, |
| 1699 | especially since it seems like we ought to be subtracting the |
| 1700 | size of the locals... and we should; but the linux kernel |
| 1701 | wants bsp to be set at the end of all used registers. It's |
| 1702 | likely that this code will need to be revised to accomodate |
| 1703 | other operating systems. */ |
| 1704 | bsp = rse_address_add (frame->extra_info->bsp, |
| 1705 | (pfs & 0x7f) - ((pfs >> 7) & 0x7f)); |
| 1706 | write_register (IA64_BSP_REGNUM, bsp); |
| 1707 | |
| 1708 | /* FIXME: What becomes of the epilog count in the PFS? */ |
| 1709 | cfm = (cfm & ~0xffffffffffffLL) | (pfs & 0xffffffffffffLL); |
| 1710 | write_register (IA64_CFM_REGNUM, cfm); |
| 1711 | |
| 1712 | flush_cached_frames (); |
| 1713 | } |
| 1714 | |
| 1715 | static void |
| 1716 | ia64_remote_translate_xfer_address (CORE_ADDR memaddr, int nr_bytes, |
| 1717 | CORE_ADDR *targ_addr, int *targ_len) |
| 1718 | { |
| 1719 | *targ_addr = memaddr; |
| 1720 | *targ_len = nr_bytes; |
| 1721 | } |
| 1722 | |
| 1723 | static struct gdbarch * |
| 1724 | ia64_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches) |
| 1725 | { |
| 1726 | struct gdbarch *gdbarch; |
| 1727 | |
| 1728 | arches = gdbarch_list_lookup_by_info (arches, &info); |
| 1729 | if (arches != NULL) |
| 1730 | return arches->gdbarch; |
| 1731 | |
| 1732 | gdbarch = gdbarch_alloc (&info, NULL); |
| 1733 | |
| 1734 | set_gdbarch_short_bit (gdbarch, 16); |
| 1735 | set_gdbarch_int_bit (gdbarch, 32); |
| 1736 | set_gdbarch_long_bit (gdbarch, 64); |
| 1737 | set_gdbarch_long_long_bit (gdbarch, 64); |
| 1738 | set_gdbarch_float_bit (gdbarch, 32); |
| 1739 | set_gdbarch_double_bit (gdbarch, 64); |
| 1740 | set_gdbarch_long_double_bit (gdbarch, 64); |
| 1741 | set_gdbarch_ptr_bit (gdbarch, 64); |
| 1742 | |
| 1743 | set_gdbarch_num_regs (gdbarch, ia64_num_regs); |
| 1744 | set_gdbarch_sp_regnum (gdbarch, sp_regnum); |
| 1745 | set_gdbarch_fp_regnum (gdbarch, fp_regnum); |
| 1746 | set_gdbarch_pc_regnum (gdbarch, pc_regnum); |
| 1747 | |
| 1748 | set_gdbarch_register_name (gdbarch, ia64_register_name); |
| 1749 | set_gdbarch_register_size (gdbarch, 8); |
| 1750 | set_gdbarch_register_bytes (gdbarch, ia64_num_regs * 8 + 128*8); |
| 1751 | set_gdbarch_register_byte (gdbarch, ia64_register_byte); |
| 1752 | set_gdbarch_register_raw_size (gdbarch, ia64_register_raw_size); |
| 1753 | set_gdbarch_max_register_raw_size (gdbarch, 16); |
| 1754 | set_gdbarch_register_virtual_size (gdbarch, ia64_register_virtual_size); |
| 1755 | set_gdbarch_max_register_virtual_size (gdbarch, 16); |
| 1756 | set_gdbarch_register_virtual_type (gdbarch, ia64_register_virtual_type); |
| 1757 | |
| 1758 | set_gdbarch_skip_prologue (gdbarch, ia64_skip_prologue); |
| 1759 | |
| 1760 | set_gdbarch_frame_num_args (gdbarch, frame_num_args_unknown); |
| 1761 | set_gdbarch_frameless_function_invocation (gdbarch, ia64_frameless_function_invocation); |
| 1762 | |
| 1763 | set_gdbarch_saved_pc_after_call (gdbarch, ia64_saved_pc_after_call); |
| 1764 | |
| 1765 | set_gdbarch_frame_chain (gdbarch, ia64_frame_chain); |
| 1766 | set_gdbarch_frame_chain_valid (gdbarch, func_frame_chain_valid); |
| 1767 | set_gdbarch_frame_saved_pc (gdbarch, ia64_frame_saved_pc); |
| 1768 | |
| 1769 | set_gdbarch_frame_init_saved_regs (gdbarch, ia64_frame_init_saved_regs); |
| 1770 | set_gdbarch_get_saved_register (gdbarch, ia64_get_saved_register); |
| 1771 | |
| 1772 | set_gdbarch_register_convertible (gdbarch, ia64_register_convertible); |
| 1773 | set_gdbarch_register_convert_to_virtual (gdbarch, ia64_register_convert_to_virtual); |
| 1774 | set_gdbarch_register_convert_to_raw (gdbarch, ia64_register_convert_to_raw); |
| 1775 | |
| 1776 | set_gdbarch_use_struct_convention (gdbarch, ia64_use_struct_convention); |
| 1777 | set_gdbarch_extract_return_value (gdbarch, ia64_extract_return_value); |
| 1778 | |
| 1779 | set_gdbarch_store_struct_return (gdbarch, ia64_store_struct_return); |
| 1780 | set_gdbarch_store_return_value (gdbarch, ia64_store_return_value); |
| 1781 | set_gdbarch_extract_struct_value_address (gdbarch, ia64_extract_struct_value_address); |
| 1782 | |
| 1783 | set_gdbarch_memory_insert_breakpoint (gdbarch, ia64_memory_insert_breakpoint); |
| 1784 | set_gdbarch_memory_remove_breakpoint (gdbarch, ia64_memory_remove_breakpoint); |
| 1785 | set_gdbarch_breakpoint_from_pc (gdbarch, ia64_breakpoint_from_pc); |
| 1786 | set_gdbarch_read_pc (gdbarch, ia64_read_pc); |
| 1787 | set_gdbarch_write_pc (gdbarch, ia64_write_pc); |
| 1788 | |
| 1789 | /* Settings for calling functions in the inferior. */ |
| 1790 | set_gdbarch_use_generic_dummy_frames (gdbarch, 1); |
| 1791 | set_gdbarch_call_dummy_length (gdbarch, 0); |
| 1792 | set_gdbarch_push_arguments (gdbarch, ia64_push_arguments); |
| 1793 | set_gdbarch_push_return_address (gdbarch, ia64_push_return_address); |
| 1794 | set_gdbarch_pop_frame (gdbarch, ia64_pop_frame); |
| 1795 | |
| 1796 | set_gdbarch_call_dummy_p (gdbarch, 1); |
| 1797 | set_gdbarch_call_dummy_words (gdbarch, ia64_call_dummy_words); |
| 1798 | set_gdbarch_sizeof_call_dummy_words (gdbarch, sizeof (ia64_call_dummy_words)); |
| 1799 | set_gdbarch_call_dummy_breakpoint_offset_p (gdbarch, 1); |
| 1800 | set_gdbarch_init_extra_frame_info (gdbarch, ia64_init_extra_frame_info); |
| 1801 | set_gdbarch_frame_args_address (gdbarch, ia64_frame_args_address); |
| 1802 | set_gdbarch_frame_locals_address (gdbarch, ia64_frame_locals_address); |
| 1803 | |
| 1804 | /* We won't necessarily have a frame pointer and even if we do, |
| 1805 | it winds up being extraordinarly messy when attempting to find |
| 1806 | the frame chain. So for the purposes of creating frames (which |
| 1807 | is all read_fp() is used for), simply use the stack pointer value |
| 1808 | instead. */ |
| 1809 | set_gdbarch_read_fp (gdbarch, generic_target_read_sp); |
| 1810 | set_gdbarch_write_fp (gdbarch, generic_target_write_sp); |
| 1811 | |
| 1812 | /* Settings that should be unnecessary. */ |
| 1813 | set_gdbarch_inner_than (gdbarch, core_addr_lessthan); |
| 1814 | |
| 1815 | set_gdbarch_read_sp (gdbarch, generic_target_read_sp); |
| 1816 | set_gdbarch_write_sp (gdbarch, generic_target_write_sp); |
| 1817 | |
| 1818 | set_gdbarch_call_dummy_location (gdbarch, AT_ENTRY_POINT); |
| 1819 | set_gdbarch_call_dummy_address (gdbarch, entry_point_address); |
| 1820 | set_gdbarch_call_dummy_breakpoint_offset (gdbarch, 0); |
| 1821 | set_gdbarch_call_dummy_start_offset (gdbarch, 0); |
| 1822 | set_gdbarch_pc_in_call_dummy (gdbarch, generic_pc_in_call_dummy); |
| 1823 | set_gdbarch_call_dummy_stack_adjust_p (gdbarch, 0); |
| 1824 | set_gdbarch_push_dummy_frame (gdbarch, generic_push_dummy_frame); |
| 1825 | set_gdbarch_fix_call_dummy (gdbarch, generic_fix_call_dummy); |
| 1826 | |
| 1827 | set_gdbarch_decr_pc_after_break (gdbarch, 0); |
| 1828 | set_gdbarch_function_start_offset (gdbarch, 0); |
| 1829 | |
| 1830 | set_gdbarch_remote_translate_xfer_address ( |
| 1831 | gdbarch, ia64_remote_translate_xfer_address); |
| 1832 | |
| 1833 | return gdbarch; |
| 1834 | } |
| 1835 | |
| 1836 | void |
| 1837 | _initialize_ia64_tdep (void) |
| 1838 | { |
| 1839 | register_gdbarch_init (bfd_arch_ia64, ia64_gdbarch_init); |
| 1840 | |
| 1841 | tm_print_insn = print_insn_ia64; |
| 1842 | tm_print_insn_info.bytes_per_line = SLOT_MULTIPLIER; |
| 1843 | } |