| 1 | /* Target-dependent code for GDB, the GNU debugger. |
| 2 | |
| 3 | Copyright 2001, 2002 Free Software Foundation, Inc. |
| 4 | |
| 5 | Contributed by D.J. Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com) |
| 6 | for IBM Deutschland Entwicklung GmbH, IBM Corporation. |
| 7 | |
| 8 | This file is part of GDB. |
| 9 | |
| 10 | This program is free software; you can redistribute it and/or modify |
| 11 | it under the terms of the GNU General Public License as published by |
| 12 | the Free Software Foundation; either version 2 of the License, or |
| 13 | (at your option) any later version. |
| 14 | |
| 15 | This program is distributed in the hope that it will be useful, |
| 16 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 17 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 18 | GNU General Public License for more details. |
| 19 | |
| 20 | You should have received a copy of the GNU General Public License |
| 21 | along with this program; if not, write to the Free Software |
| 22 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA |
| 23 | 02111-1307, USA. */ |
| 24 | |
| 25 | #define S390_TDEP /* for special macros in tm-s390.h */ |
| 26 | #include <defs.h> |
| 27 | #include "arch-utils.h" |
| 28 | #include "frame.h" |
| 29 | #include "inferior.h" |
| 30 | #include "symtab.h" |
| 31 | #include "target.h" |
| 32 | #include "gdbcore.h" |
| 33 | #include "gdbcmd.h" |
| 34 | #include "symfile.h" |
| 35 | #include "objfiles.h" |
| 36 | #include "tm.h" |
| 37 | #include "../bfd/bfd.h" |
| 38 | #include "floatformat.h" |
| 39 | #include "regcache.h" |
| 40 | #include "value.h" |
| 41 | #include "gdb_assert.h" |
| 42 | |
| 43 | |
| 44 | |
| 45 | |
| 46 | /* Number of bytes of storage in the actual machine representation |
| 47 | for register N. */ |
| 48 | int |
| 49 | s390_register_raw_size (int reg_nr) |
| 50 | { |
| 51 | if (S390_FP0_REGNUM <= reg_nr |
| 52 | && reg_nr < S390_FP0_REGNUM + S390_NUM_FPRS) |
| 53 | return S390_FPR_SIZE; |
| 54 | else |
| 55 | return 4; |
| 56 | } |
| 57 | |
| 58 | int |
| 59 | s390x_register_raw_size (int reg_nr) |
| 60 | { |
| 61 | return (reg_nr == S390_FPC_REGNUM) |
| 62 | || (reg_nr >= S390_FIRST_ACR && reg_nr <= S390_LAST_ACR) ? 4 : 8; |
| 63 | } |
| 64 | |
| 65 | int |
| 66 | s390_cannot_fetch_register (int regno) |
| 67 | { |
| 68 | return (regno >= S390_FIRST_CR && regno < (S390_FIRST_CR + 9)) || |
| 69 | (regno >= (S390_FIRST_CR + 12) && regno <= S390_LAST_CR); |
| 70 | } |
| 71 | |
| 72 | int |
| 73 | s390_register_byte (int reg_nr) |
| 74 | { |
| 75 | if (reg_nr <= S390_GP_LAST_REGNUM) |
| 76 | return reg_nr * S390_GPR_SIZE; |
| 77 | if (reg_nr <= S390_LAST_ACR) |
| 78 | return S390_ACR0_OFFSET + (((reg_nr) - S390_FIRST_ACR) * S390_ACR_SIZE); |
| 79 | if (reg_nr <= S390_LAST_CR) |
| 80 | return S390_CR0_OFFSET + (((reg_nr) - S390_FIRST_CR) * S390_CR_SIZE); |
| 81 | if (reg_nr == S390_FPC_REGNUM) |
| 82 | return S390_FPC_OFFSET; |
| 83 | else |
| 84 | return S390_FP0_OFFSET + (((reg_nr) - S390_FP0_REGNUM) * S390_FPR_SIZE); |
| 85 | } |
| 86 | |
| 87 | #ifndef GDBSERVER |
| 88 | #define S390_MAX_INSTR_SIZE (6) |
| 89 | #define S390_SYSCALL_OPCODE (0x0a) |
| 90 | #define S390_SYSCALL_SIZE (2) |
| 91 | #define S390_SIGCONTEXT_SREGS_OFFSET (8) |
| 92 | #define S390X_SIGCONTEXT_SREGS_OFFSET (8) |
| 93 | #define S390_SIGREGS_FP0_OFFSET (144) |
| 94 | #define S390X_SIGREGS_FP0_OFFSET (216) |
| 95 | #define S390_UC_MCONTEXT_OFFSET (256) |
| 96 | #define S390X_UC_MCONTEXT_OFFSET (344) |
| 97 | #define S390_STACK_FRAME_OVERHEAD (GDB_TARGET_IS_ESAME ? 160:96) |
| 98 | #define S390_SIGNAL_FRAMESIZE (GDB_TARGET_IS_ESAME ? 160:96) |
| 99 | #define s390_NR_sigreturn 119 |
| 100 | #define s390_NR_rt_sigreturn 173 |
| 101 | |
| 102 | |
| 103 | |
| 104 | struct frame_extra_info |
| 105 | { |
| 106 | int initialised; |
| 107 | int good_prologue; |
| 108 | CORE_ADDR function_start; |
| 109 | CORE_ADDR skip_prologue_function_start; |
| 110 | CORE_ADDR saved_pc_valid; |
| 111 | CORE_ADDR saved_pc; |
| 112 | CORE_ADDR sig_fixed_saved_pc_valid; |
| 113 | CORE_ADDR sig_fixed_saved_pc; |
| 114 | CORE_ADDR frame_pointer_saved_pc; /* frame pointer needed for alloca */ |
| 115 | CORE_ADDR stack_bought; /* amount we decrement the stack pointer by */ |
| 116 | CORE_ADDR sigcontext; |
| 117 | }; |
| 118 | |
| 119 | |
| 120 | static CORE_ADDR s390_frame_saved_pc_nofix (struct frame_info *fi); |
| 121 | |
| 122 | int |
| 123 | s390_readinstruction (bfd_byte instr[], CORE_ADDR at, |
| 124 | struct disassemble_info *info) |
| 125 | { |
| 126 | int instrlen; |
| 127 | |
| 128 | static int s390_instrlen[] = { |
| 129 | 2, |
| 130 | 4, |
| 131 | 4, |
| 132 | 6 |
| 133 | }; |
| 134 | if ((*info->read_memory_func) (at, &instr[0], 2, info)) |
| 135 | return -1; |
| 136 | instrlen = s390_instrlen[instr[0] >> 6]; |
| 137 | if (instrlen > 2) |
| 138 | { |
| 139 | if ((*info->read_memory_func) (at + 2, &instr[2], instrlen - 2, info)) |
| 140 | return -1; |
| 141 | } |
| 142 | return instrlen; |
| 143 | } |
| 144 | |
| 145 | static void |
| 146 | s390_memset_extra_info (struct frame_extra_info *fextra_info) |
| 147 | { |
| 148 | memset (fextra_info, 0, sizeof (struct frame_extra_info)); |
| 149 | } |
| 150 | |
| 151 | |
| 152 | |
| 153 | const char * |
| 154 | s390_register_name (int reg_nr) |
| 155 | { |
| 156 | static char *register_names[] = { |
| 157 | "pswm", "pswa", |
| 158 | "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", |
| 159 | "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15", |
| 160 | "acr0", "acr1", "acr2", "acr3", "acr4", "acr5", "acr6", "acr7", |
| 161 | "acr8", "acr9", "acr10", "acr11", "acr12", "acr13", "acr14", "acr15", |
| 162 | "cr0", "cr1", "cr2", "cr3", "cr4", "cr5", "cr6", "cr7", |
| 163 | "cr8", "cr9", "cr10", "cr11", "cr12", "cr13", "cr14", "cr15", |
| 164 | "fpc", |
| 165 | "f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7", |
| 166 | "f8", "f9", "f10", "f11", "f12", "f13", "f14", "f15" |
| 167 | }; |
| 168 | |
| 169 | if (reg_nr <= S390_LAST_REGNUM) |
| 170 | return register_names[reg_nr]; |
| 171 | else |
| 172 | return NULL; |
| 173 | } |
| 174 | |
| 175 | |
| 176 | |
| 177 | |
| 178 | int |
| 179 | s390_stab_reg_to_regnum (int regno) |
| 180 | { |
| 181 | return regno >= 64 ? S390_PSWM_REGNUM - 64 : |
| 182 | regno >= 48 ? S390_FIRST_ACR - 48 : |
| 183 | regno >= 32 ? S390_FIRST_CR - 32 : |
| 184 | regno <= 15 ? (regno + 2) : |
| 185 | S390_FP0_REGNUM + ((regno - 16) & 8) + (((regno - 16) & 3) << 1) + |
| 186 | (((regno - 16) & 4) >> 2); |
| 187 | } |
| 188 | |
| 189 | |
| 190 | /* Return true if REGIDX is the number of a register used to pass |
| 191 | arguments, false otherwise. */ |
| 192 | static int |
| 193 | is_arg_reg (int regidx) |
| 194 | { |
| 195 | return 2 <= regidx && regidx <= 6; |
| 196 | } |
| 197 | |
| 198 | |
| 199 | /* s390_get_frame_info based on Hartmuts |
| 200 | prologue definition in |
| 201 | gcc-2.8.1/config/l390/linux.c |
| 202 | |
| 203 | It reads one instruction at a time & based on whether |
| 204 | it looks like prologue code or not it makes a decision on |
| 205 | whether the prologue is over, there are various state machines |
| 206 | in the code to determine if the prologue code is possilby valid. |
| 207 | |
| 208 | This is done to hopefully allow the code survive minor revs of |
| 209 | calling conventions. |
| 210 | |
| 211 | */ |
| 212 | |
| 213 | int |
| 214 | s390_get_frame_info (CORE_ADDR pc, struct frame_extra_info *fextra_info, |
| 215 | struct frame_info *fi, int init_extra_info) |
| 216 | { |
| 217 | #define CONST_POOL_REGIDX 13 |
| 218 | #define GOT_REGIDX 12 |
| 219 | bfd_byte instr[S390_MAX_INSTR_SIZE]; |
| 220 | CORE_ADDR test_pc = pc, test_pc2; |
| 221 | CORE_ADDR orig_sp = 0, save_reg_addr = 0, *saved_regs = NULL; |
| 222 | int valid_prologue, good_prologue = 0; |
| 223 | int gprs_saved[S390_NUM_GPRS]; |
| 224 | int fprs_saved[S390_NUM_FPRS]; |
| 225 | int regidx, instrlen; |
| 226 | int const_pool_state; |
| 227 | int varargs_state; |
| 228 | int loop_cnt, gdb_gpr_store, gdb_fpr_store; |
| 229 | int offset, expected_offset; |
| 230 | int err = 0; |
| 231 | disassemble_info info; |
| 232 | |
| 233 | /* Have we seen an instruction initializing the frame pointer yet? |
| 234 | If we've seen an `lr %r11, %r15', then frame_pointer_found is |
| 235 | non-zero, and frame_pointer_regidx == 11. Otherwise, |
| 236 | frame_pointer_found is zero and frame_pointer_regidx is 15, |
| 237 | indicating that we're using the stack pointer as our frame |
| 238 | pointer. */ |
| 239 | int frame_pointer_found = 0; |
| 240 | int frame_pointer_regidx = 0xf; |
| 241 | |
| 242 | /* What we've seen so far regarding saving the back chain link: |
| 243 | 0 -- nothing yet; sp still has the same value it had at the entry |
| 244 | point. Since not all functions allocate frames, this is a |
| 245 | valid state for the prologue to finish in. |
| 246 | 1 -- We've saved the original sp in some register other than the |
| 247 | frame pointer (hard-coded to be %r11, yuck). |
| 248 | save_link_regidx is the register we saved it in. |
| 249 | 2 -- We've seen the initial `bras' instruction of the sequence for |
| 250 | reserving more than 32k of stack: |
| 251 | bras %rX, .+8 |
| 252 | .long N |
| 253 | s %r15, 0(%rX) |
| 254 | where %rX is not the constant pool register. |
| 255 | subtract_sp_regidx is %rX, and fextra_info->stack_bought is N. |
| 256 | 3 -- We've reserved space for a new stack frame. This means we |
| 257 | either saw a simple `ahi %r15,-N' in state 1, or the final |
| 258 | `s %r15, ...' in state 2. |
| 259 | 4 -- The frame and link are now fully initialized. We've |
| 260 | reserved space for the new stack frame, and stored the old |
| 261 | stack pointer captured in the back chain pointer field. */ |
| 262 | int save_link_state = 0; |
| 263 | int save_link_regidx, subtract_sp_regidx; |
| 264 | |
| 265 | /* What we've seen so far regarding r12 --- the GOT (Global Offset |
| 266 | Table) pointer. We expect to see `l %r12, N(%r13)', which loads |
| 267 | r12 with the offset from the constant pool to the GOT, and then |
| 268 | an `ar %r12, %r13', which adds the constant pool address, |
| 269 | yielding the GOT's address. Here's what got_state means: |
| 270 | 0 -- seen nothing |
| 271 | 1 -- seen `l %r12, N(%r13)', but no `ar' |
| 272 | 2 -- seen load and add, so GOT pointer is totally initialized |
| 273 | When got_state is 1, then got_load_addr is the address of the |
| 274 | load instruction, and got_load_len is the length of that |
| 275 | instruction. */ |
| 276 | int got_state= 0; |
| 277 | CORE_ADDR got_load_addr = 0, got_load_len = 0; |
| 278 | |
| 279 | const_pool_state = varargs_state = 0; |
| 280 | |
| 281 | memset (gprs_saved, 0, sizeof (gprs_saved)); |
| 282 | memset (fprs_saved, 0, sizeof (fprs_saved)); |
| 283 | info.read_memory_func = dis_asm_read_memory; |
| 284 | |
| 285 | save_link_regidx = subtract_sp_regidx = 0; |
| 286 | if (fextra_info) |
| 287 | { |
| 288 | if (fi && fi->frame) |
| 289 | { |
| 290 | orig_sp = fi->frame; |
| 291 | if (! init_extra_info && fextra_info->initialised) |
| 292 | orig_sp += fextra_info->stack_bought; |
| 293 | saved_regs = fi->saved_regs; |
| 294 | } |
| 295 | if (init_extra_info || !fextra_info->initialised) |
| 296 | { |
| 297 | s390_memset_extra_info (fextra_info); |
| 298 | fextra_info->function_start = pc; |
| 299 | fextra_info->initialised = 1; |
| 300 | } |
| 301 | } |
| 302 | instrlen = 0; |
| 303 | do |
| 304 | { |
| 305 | valid_prologue = 0; |
| 306 | test_pc += instrlen; |
| 307 | /* add the previous instruction len */ |
| 308 | instrlen = s390_readinstruction (instr, test_pc, &info); |
| 309 | if (instrlen < 0) |
| 310 | { |
| 311 | good_prologue = 0; |
| 312 | err = -1; |
| 313 | break; |
| 314 | } |
| 315 | /* We probably are in a glibc syscall */ |
| 316 | if (instr[0] == S390_SYSCALL_OPCODE && test_pc == pc) |
| 317 | { |
| 318 | good_prologue = 1; |
| 319 | if (saved_regs && fextra_info && fi->next && fi->next->extra_info |
| 320 | && fi->next->extra_info->sigcontext) |
| 321 | { |
| 322 | /* We are backtracing from a signal handler */ |
| 323 | save_reg_addr = fi->next->extra_info->sigcontext + |
| 324 | REGISTER_BYTE (S390_GP0_REGNUM); |
| 325 | for (regidx = 0; regidx < S390_NUM_GPRS; regidx++) |
| 326 | { |
| 327 | saved_regs[S390_GP0_REGNUM + regidx] = save_reg_addr; |
| 328 | save_reg_addr += S390_GPR_SIZE; |
| 329 | } |
| 330 | save_reg_addr = fi->next->extra_info->sigcontext + |
| 331 | (GDB_TARGET_IS_ESAME ? S390X_SIGREGS_FP0_OFFSET : |
| 332 | S390_SIGREGS_FP0_OFFSET); |
| 333 | for (regidx = 0; regidx < S390_NUM_FPRS; regidx++) |
| 334 | { |
| 335 | saved_regs[S390_FP0_REGNUM + regidx] = save_reg_addr; |
| 336 | save_reg_addr += S390_FPR_SIZE; |
| 337 | } |
| 338 | } |
| 339 | break; |
| 340 | } |
| 341 | if (save_link_state == 0) |
| 342 | { |
| 343 | /* check for a stack relative STMG or STM */ |
| 344 | if (((GDB_TARGET_IS_ESAME && |
| 345 | ((instr[0] == 0xeb) && (instr[5] == 0x24))) || |
| 346 | (instr[0] == 0x90)) && ((instr[2] >> 4) == 0xf)) |
| 347 | { |
| 348 | regidx = (instr[1] >> 4); |
| 349 | if (regidx < 6) |
| 350 | varargs_state = 1; |
| 351 | offset = ((instr[2] & 0xf) << 8) + instr[3]; |
| 352 | expected_offset = |
| 353 | S390_GPR6_STACK_OFFSET + (S390_GPR_SIZE * (regidx - 6)); |
| 354 | if (offset != expected_offset) |
| 355 | { |
| 356 | good_prologue = 0; |
| 357 | break; |
| 358 | } |
| 359 | if (saved_regs) |
| 360 | save_reg_addr = orig_sp + offset; |
| 361 | for (; regidx <= (instr[1] & 0xf); regidx++) |
| 362 | { |
| 363 | if (gprs_saved[regidx]) |
| 364 | { |
| 365 | good_prologue = 0; |
| 366 | break; |
| 367 | } |
| 368 | good_prologue = 1; |
| 369 | gprs_saved[regidx] = 1; |
| 370 | if (saved_regs) |
| 371 | { |
| 372 | saved_regs[S390_GP0_REGNUM + regidx] = save_reg_addr; |
| 373 | save_reg_addr += S390_GPR_SIZE; |
| 374 | } |
| 375 | } |
| 376 | valid_prologue = 1; |
| 377 | continue; |
| 378 | } |
| 379 | } |
| 380 | /* check for a stack relative STG or ST */ |
| 381 | if ((save_link_state == 0 || save_link_state == 3) && |
| 382 | ((GDB_TARGET_IS_ESAME && |
| 383 | ((instr[0] == 0xe3) && (instr[5] == 0x24))) || |
| 384 | (instr[0] == 0x50)) && ((instr[2] >> 4) == 0xf)) |
| 385 | { |
| 386 | regidx = instr[1] >> 4; |
| 387 | offset = ((instr[2] & 0xf) << 8) + instr[3]; |
| 388 | if (offset == 0) |
| 389 | { |
| 390 | if (save_link_state == 3 && regidx == save_link_regidx) |
| 391 | { |
| 392 | save_link_state = 4; |
| 393 | valid_prologue = 1; |
| 394 | continue; |
| 395 | } |
| 396 | else |
| 397 | break; |
| 398 | } |
| 399 | if (regidx < 6) |
| 400 | varargs_state = 1; |
| 401 | expected_offset = |
| 402 | S390_GPR6_STACK_OFFSET + (S390_GPR_SIZE * (regidx - 6)); |
| 403 | if (offset != expected_offset) |
| 404 | { |
| 405 | good_prologue = 0; |
| 406 | break; |
| 407 | } |
| 408 | if (gprs_saved[regidx]) |
| 409 | { |
| 410 | good_prologue = 0; |
| 411 | break; |
| 412 | } |
| 413 | good_prologue = 1; |
| 414 | gprs_saved[regidx] = 1; |
| 415 | if (saved_regs) |
| 416 | { |
| 417 | save_reg_addr = orig_sp + offset; |
| 418 | saved_regs[S390_GP0_REGNUM + regidx] = save_reg_addr; |
| 419 | } |
| 420 | valid_prologue = 1; |
| 421 | continue; |
| 422 | } |
| 423 | |
| 424 | /* Check for an fp-relative STG, ST, or STM. This is probably |
| 425 | spilling an argument from a register out into a stack slot. |
| 426 | This could be a user instruction, but if we haven't included |
| 427 | any other suspicious instructions in the prologue, this |
| 428 | could only be an initializing store, which isn't too bad to |
| 429 | skip. The consequences of not including arg-to-stack spills |
| 430 | are more serious, though --- you don't see the proper values |
| 431 | of the arguments. */ |
| 432 | if ((save_link_state == 3 || save_link_state == 4) |
| 433 | && ((instr[0] == 0x50 /* st %rA, D(%rX,%rB) */ |
| 434 | && (instr[1] & 0xf) == 0 /* %rX is zero, no index reg */ |
| 435 | && is_arg_reg ((instr[1] >> 4) & 0xf) |
| 436 | && ((instr[2] >> 4) & 0xf) == frame_pointer_regidx) |
| 437 | || (instr[0] == 0x90 /* stm %rA, %rB, D(%rC) */ |
| 438 | && is_arg_reg ((instr[1] >> 4) & 0xf) |
| 439 | && is_arg_reg (instr[1] & 0xf) |
| 440 | && ((instr[2] >> 4) & 0xf) == frame_pointer_regidx))) |
| 441 | { |
| 442 | valid_prologue = 1; |
| 443 | continue; |
| 444 | } |
| 445 | |
| 446 | /* check for STD */ |
| 447 | if (instr[0] == 0x60 && (instr[2] >> 4) == 0xf) |
| 448 | { |
| 449 | regidx = instr[1] >> 4; |
| 450 | if (regidx == 0 || regidx == 2) |
| 451 | varargs_state = 1; |
| 452 | if (fprs_saved[regidx]) |
| 453 | { |
| 454 | good_prologue = 0; |
| 455 | break; |
| 456 | } |
| 457 | fprs_saved[regidx] = 1; |
| 458 | if (saved_regs) |
| 459 | { |
| 460 | save_reg_addr = orig_sp + (((instr[2] & 0xf) << 8) + instr[3]); |
| 461 | saved_regs[S390_FP0_REGNUM + regidx] = save_reg_addr; |
| 462 | } |
| 463 | valid_prologue = 1; |
| 464 | continue; |
| 465 | } |
| 466 | |
| 467 | |
| 468 | if (const_pool_state == 0) |
| 469 | { |
| 470 | |
| 471 | if (GDB_TARGET_IS_ESAME) |
| 472 | { |
| 473 | /* Check for larl CONST_POOL_REGIDX,offset on ESAME */ |
| 474 | if ((instr[0] == 0xc0) |
| 475 | && (instr[1] == (CONST_POOL_REGIDX << 4))) |
| 476 | { |
| 477 | const_pool_state = 2; |
| 478 | valid_prologue = 1; |
| 479 | continue; |
| 480 | } |
| 481 | } |
| 482 | else |
| 483 | { |
| 484 | /* Check for BASR gpr13,gpr0 used to load constant pool pointer to r13 in old compiler */ |
| 485 | if (instr[0] == 0xd && (instr[1] & 0xf) == 0 |
| 486 | && ((instr[1] >> 4) == CONST_POOL_REGIDX)) |
| 487 | { |
| 488 | const_pool_state = 1; |
| 489 | valid_prologue = 1; |
| 490 | continue; |
| 491 | } |
| 492 | } |
| 493 | /* Check for new fangled bras %r13,newpc to load new constant pool */ |
| 494 | /* embedded in code, older pre abi compilers also emitted this stuff. */ |
| 495 | if ((instr[0] == 0xa7) && ((instr[1] & 0xf) == 0x5) && |
| 496 | ((instr[1] >> 4) == CONST_POOL_REGIDX) |
| 497 | && ((instr[2] & 0x80) == 0)) |
| 498 | { |
| 499 | const_pool_state = 2; |
| 500 | test_pc += |
| 501 | (((((instr[2] & 0xf) << 8) + instr[3]) << 1) - instrlen); |
| 502 | valid_prologue = 1; |
| 503 | continue; |
| 504 | } |
| 505 | } |
| 506 | /* Check for AGHI or AHI CONST_POOL_REGIDX,val */ |
| 507 | if (const_pool_state == 1 && (instr[0] == 0xa7) && |
| 508 | ((GDB_TARGET_IS_ESAME && |
| 509 | (instr[1] == ((CONST_POOL_REGIDX << 4) | 0xb))) || |
| 510 | (instr[1] == ((CONST_POOL_REGIDX << 4) | 0xa)))) |
| 511 | { |
| 512 | const_pool_state = 2; |
| 513 | valid_prologue = 1; |
| 514 | continue; |
| 515 | } |
| 516 | /* Check for LGR or LR gprx,15 */ |
| 517 | if ((GDB_TARGET_IS_ESAME && |
| 518 | instr[0] == 0xb9 && instr[1] == 0x04 && (instr[3] & 0xf) == 0xf) || |
| 519 | (instr[0] == 0x18 && (instr[1] & 0xf) == 0xf)) |
| 520 | { |
| 521 | if (GDB_TARGET_IS_ESAME) |
| 522 | regidx = instr[3] >> 4; |
| 523 | else |
| 524 | regidx = instr[1] >> 4; |
| 525 | if (save_link_state == 0 && regidx != 0xb) |
| 526 | { |
| 527 | /* Almost defintely code for |
| 528 | decrementing the stack pointer |
| 529 | ( i.e. a non leaf function |
| 530 | or else leaf with locals ) */ |
| 531 | save_link_regidx = regidx; |
| 532 | save_link_state = 1; |
| 533 | valid_prologue = 1; |
| 534 | continue; |
| 535 | } |
| 536 | /* We use this frame pointer for alloca |
| 537 | unfortunately we need to assume its gpr11 |
| 538 | otherwise we would need a smarter prologue |
| 539 | walker. */ |
| 540 | if (!frame_pointer_found && regidx == 0xb) |
| 541 | { |
| 542 | frame_pointer_regidx = 0xb; |
| 543 | frame_pointer_found = 1; |
| 544 | if (fextra_info) |
| 545 | fextra_info->frame_pointer_saved_pc = test_pc; |
| 546 | valid_prologue = 1; |
| 547 | continue; |
| 548 | } |
| 549 | } |
| 550 | /* Check for AHI or AGHI gpr15,val */ |
| 551 | if (save_link_state == 1 && (instr[0] == 0xa7) && |
| 552 | ((GDB_TARGET_IS_ESAME && (instr[1] == 0xfb)) || (instr[1] == 0xfa))) |
| 553 | { |
| 554 | if (fextra_info) |
| 555 | fextra_info->stack_bought = |
| 556 | -extract_signed_integer (&instr[2], 2); |
| 557 | save_link_state = 3; |
| 558 | valid_prologue = 1; |
| 559 | continue; |
| 560 | } |
| 561 | /* Alternatively check for the complex construction for |
| 562 | buying more than 32k of stack |
| 563 | BRAS gprx,.+8 |
| 564 | long val |
| 565 | s %r15,0(%gprx) gprx currently r1 */ |
| 566 | if ((save_link_state == 1) && (instr[0] == 0xa7) |
| 567 | && ((instr[1] & 0xf) == 0x5) && (instr[2] == 0) |
| 568 | && (instr[3] == 0x4) && ((instr[1] >> 4) != CONST_POOL_REGIDX)) |
| 569 | { |
| 570 | subtract_sp_regidx = instr[1] >> 4; |
| 571 | save_link_state = 2; |
| 572 | if (fextra_info) |
| 573 | target_read_memory (test_pc + instrlen, |
| 574 | (char *) &fextra_info->stack_bought, |
| 575 | sizeof (fextra_info->stack_bought)); |
| 576 | test_pc += 4; |
| 577 | valid_prologue = 1; |
| 578 | continue; |
| 579 | } |
| 580 | if (save_link_state == 2 && instr[0] == 0x5b |
| 581 | && instr[1] == 0xf0 && |
| 582 | instr[2] == (subtract_sp_regidx << 4) && instr[3] == 0) |
| 583 | { |
| 584 | save_link_state = 3; |
| 585 | valid_prologue = 1; |
| 586 | continue; |
| 587 | } |
| 588 | /* check for LA gprx,offset(15) used for varargs */ |
| 589 | if ((instr[0] == 0x41) && ((instr[2] >> 4) == 0xf) && |
| 590 | ((instr[1] & 0xf) == 0)) |
| 591 | { |
| 592 | /* some code uses gpr7 to point to outgoing args */ |
| 593 | if (((instr[1] >> 4) == 7) && (save_link_state == 0) && |
| 594 | ((instr[2] & 0xf) == 0) |
| 595 | && (instr[3] == S390_STACK_FRAME_OVERHEAD)) |
| 596 | { |
| 597 | valid_prologue = 1; |
| 598 | continue; |
| 599 | } |
| 600 | if (varargs_state == 1) |
| 601 | { |
| 602 | varargs_state = 2; |
| 603 | valid_prologue = 1; |
| 604 | continue; |
| 605 | } |
| 606 | } |
| 607 | /* Check for a GOT load */ |
| 608 | |
| 609 | if (GDB_TARGET_IS_ESAME) |
| 610 | { |
| 611 | /* Check for larl GOT_REGIDX, on ESAME */ |
| 612 | if ((got_state == 0) && (instr[0] == 0xc0) |
| 613 | && (instr[1] == (GOT_REGIDX << 4))) |
| 614 | { |
| 615 | got_state = 2; |
| 616 | valid_prologue = 1; |
| 617 | continue; |
| 618 | } |
| 619 | } |
| 620 | else |
| 621 | { |
| 622 | /* check for l GOT_REGIDX,x(CONST_POOL_REGIDX) */ |
| 623 | if (got_state == 0 && const_pool_state == 2 && instr[0] == 0x58 |
| 624 | && (instr[2] == (CONST_POOL_REGIDX << 4)) |
| 625 | && ((instr[1] >> 4) == GOT_REGIDX)) |
| 626 | { |
| 627 | got_state = 1; |
| 628 | got_load_addr = test_pc; |
| 629 | got_load_len = instrlen; |
| 630 | valid_prologue = 1; |
| 631 | continue; |
| 632 | } |
| 633 | /* Check for subsequent ar got_regidx,basr_regidx */ |
| 634 | if (got_state == 1 && instr[0] == 0x1a && |
| 635 | instr[1] == ((GOT_REGIDX << 4) | CONST_POOL_REGIDX)) |
| 636 | { |
| 637 | got_state = 2; |
| 638 | valid_prologue = 1; |
| 639 | continue; |
| 640 | } |
| 641 | } |
| 642 | } |
| 643 | while (valid_prologue && good_prologue); |
| 644 | if (good_prologue) |
| 645 | { |
| 646 | /* If this function doesn't reference the global offset table, |
| 647 | then the compiler may use r12 for other things. If the last |
| 648 | instruction we saw was a load of r12 from the constant pool, |
| 649 | with no subsequent add to make the address PC-relative, then |
| 650 | the load was probably a genuine body instruction; don't treat |
| 651 | it as part of the prologue. */ |
| 652 | if (got_state == 1 |
| 653 | && got_load_addr + got_load_len == test_pc) |
| 654 | { |
| 655 | test_pc = got_load_addr; |
| 656 | instrlen = got_load_len; |
| 657 | } |
| 658 | |
| 659 | good_prologue = (((const_pool_state == 0) || (const_pool_state == 2)) && |
| 660 | ((save_link_state == 0) || (save_link_state == 4)) && |
| 661 | ((varargs_state == 0) || (varargs_state == 2))); |
| 662 | } |
| 663 | if (fextra_info) |
| 664 | { |
| 665 | fextra_info->good_prologue = good_prologue; |
| 666 | fextra_info->skip_prologue_function_start = |
| 667 | (good_prologue ? test_pc : pc); |
| 668 | } |
| 669 | if (saved_regs) |
| 670 | /* The SP's element of the saved_regs array holds the old SP, |
| 671 | not the address at which it is saved. */ |
| 672 | saved_regs[S390_SP_REGNUM] = orig_sp; |
| 673 | return err; |
| 674 | } |
| 675 | |
| 676 | |
| 677 | int |
| 678 | s390_check_function_end (CORE_ADDR pc) |
| 679 | { |
| 680 | bfd_byte instr[S390_MAX_INSTR_SIZE]; |
| 681 | disassemble_info info; |
| 682 | int regidx, instrlen; |
| 683 | |
| 684 | info.read_memory_func = dis_asm_read_memory; |
| 685 | instrlen = s390_readinstruction (instr, pc, &info); |
| 686 | if (instrlen < 0) |
| 687 | return -1; |
| 688 | /* check for BR */ |
| 689 | if (instrlen != 2 || instr[0] != 07 || (instr[1] >> 4) != 0xf) |
| 690 | return 0; |
| 691 | regidx = instr[1] & 0xf; |
| 692 | /* Check for LMG or LG */ |
| 693 | instrlen = |
| 694 | s390_readinstruction (instr, pc - (GDB_TARGET_IS_ESAME ? 6 : 4), &info); |
| 695 | if (instrlen < 0) |
| 696 | return -1; |
| 697 | if (GDB_TARGET_IS_ESAME) |
| 698 | { |
| 699 | |
| 700 | if (instrlen != 6 || instr[0] != 0xeb || instr[5] != 0x4) |
| 701 | return 0; |
| 702 | } |
| 703 | else if (instrlen != 4 || instr[0] != 0x98) |
| 704 | { |
| 705 | return 0; |
| 706 | } |
| 707 | if ((instr[2] >> 4) != 0xf) |
| 708 | return 0; |
| 709 | if (regidx == 14) |
| 710 | return 1; |
| 711 | instrlen = s390_readinstruction (instr, pc - (GDB_TARGET_IS_ESAME ? 12 : 8), |
| 712 | &info); |
| 713 | if (instrlen < 0) |
| 714 | return -1; |
| 715 | if (GDB_TARGET_IS_ESAME) |
| 716 | { |
| 717 | /* Check for LG */ |
| 718 | if (instrlen != 6 || instr[0] != 0xe3 || instr[5] != 0x4) |
| 719 | return 0; |
| 720 | } |
| 721 | else |
| 722 | { |
| 723 | /* Check for L */ |
| 724 | if (instrlen != 4 || instr[0] != 0x58) |
| 725 | return 0; |
| 726 | } |
| 727 | if (instr[2] >> 4 != 0xf) |
| 728 | return 0; |
| 729 | if (instr[1] >> 4 != regidx) |
| 730 | return 0; |
| 731 | return 1; |
| 732 | } |
| 733 | |
| 734 | static CORE_ADDR |
| 735 | s390_sniff_pc_function_start (CORE_ADDR pc, struct frame_info *fi) |
| 736 | { |
| 737 | CORE_ADDR function_start, test_function_start; |
| 738 | int loop_cnt, err, function_end; |
| 739 | struct frame_extra_info fextra_info; |
| 740 | function_start = get_pc_function_start (pc); |
| 741 | |
| 742 | if (function_start == 0) |
| 743 | { |
| 744 | test_function_start = pc; |
| 745 | if (test_function_start & 1) |
| 746 | return 0; /* This has to be bogus */ |
| 747 | loop_cnt = 0; |
| 748 | do |
| 749 | { |
| 750 | |
| 751 | err = |
| 752 | s390_get_frame_info (test_function_start, &fextra_info, fi, 1); |
| 753 | loop_cnt++; |
| 754 | test_function_start -= 2; |
| 755 | function_end = s390_check_function_end (test_function_start); |
| 756 | } |
| 757 | while (!(function_end == 1 || err || loop_cnt >= 4096 || |
| 758 | (fextra_info.good_prologue))); |
| 759 | if (fextra_info.good_prologue) |
| 760 | function_start = fextra_info.function_start; |
| 761 | else if (function_end == 1) |
| 762 | function_start = test_function_start; |
| 763 | } |
| 764 | return function_start; |
| 765 | } |
| 766 | |
| 767 | |
| 768 | |
| 769 | CORE_ADDR |
| 770 | s390_function_start (struct frame_info *fi) |
| 771 | { |
| 772 | CORE_ADDR function_start = 0; |
| 773 | |
| 774 | if (fi->extra_info && fi->extra_info->initialised) |
| 775 | function_start = fi->extra_info->function_start; |
| 776 | else if (fi->pc) |
| 777 | function_start = get_pc_function_start (fi->pc); |
| 778 | return function_start; |
| 779 | } |
| 780 | |
| 781 | |
| 782 | |
| 783 | |
| 784 | int |
| 785 | s390_frameless_function_invocation (struct frame_info *fi) |
| 786 | { |
| 787 | struct frame_extra_info fextra_info, *fextra_info_ptr; |
| 788 | int frameless = 0; |
| 789 | |
| 790 | if (fi->next == NULL) /* no may be frameless */ |
| 791 | { |
| 792 | if (fi->extra_info) |
| 793 | fextra_info_ptr = fi->extra_info; |
| 794 | else |
| 795 | { |
| 796 | fextra_info_ptr = &fextra_info; |
| 797 | s390_get_frame_info (s390_sniff_pc_function_start (fi->pc, fi), |
| 798 | fextra_info_ptr, fi, 1); |
| 799 | } |
| 800 | frameless = ((fextra_info_ptr->stack_bought == 0)); |
| 801 | } |
| 802 | return frameless; |
| 803 | |
| 804 | } |
| 805 | |
| 806 | |
| 807 | static int |
| 808 | s390_is_sigreturn (CORE_ADDR pc, struct frame_info *sighandler_fi, |
| 809 | CORE_ADDR *sregs, CORE_ADDR *sigcaller_pc) |
| 810 | { |
| 811 | bfd_byte instr[S390_MAX_INSTR_SIZE]; |
| 812 | disassemble_info info; |
| 813 | int instrlen; |
| 814 | CORE_ADDR scontext; |
| 815 | int retval = 0; |
| 816 | CORE_ADDR orig_sp; |
| 817 | CORE_ADDR temp_sregs; |
| 818 | |
| 819 | scontext = temp_sregs = 0; |
| 820 | |
| 821 | info.read_memory_func = dis_asm_read_memory; |
| 822 | instrlen = s390_readinstruction (instr, pc, &info); |
| 823 | if (sigcaller_pc) |
| 824 | *sigcaller_pc = 0; |
| 825 | if (((instrlen == S390_SYSCALL_SIZE) && |
| 826 | (instr[0] == S390_SYSCALL_OPCODE)) && |
| 827 | ((instr[1] == s390_NR_sigreturn) || (instr[1] == s390_NR_rt_sigreturn))) |
| 828 | { |
| 829 | if (sighandler_fi) |
| 830 | { |
| 831 | if (s390_frameless_function_invocation (sighandler_fi)) |
| 832 | orig_sp = sighandler_fi->frame; |
| 833 | else |
| 834 | orig_sp = ADDR_BITS_REMOVE ((CORE_ADDR) |
| 835 | read_memory_integer (sighandler_fi-> |
| 836 | frame, |
| 837 | S390_GPR_SIZE)); |
| 838 | if (orig_sp && sigcaller_pc) |
| 839 | { |
| 840 | scontext = orig_sp + S390_SIGNAL_FRAMESIZE; |
| 841 | if (pc == scontext && instr[1] == s390_NR_rt_sigreturn) |
| 842 | { |
| 843 | /* We got a new style rt_signal */ |
| 844 | /* get address of read ucontext->uc_mcontext */ |
| 845 | temp_sregs = orig_sp + (GDB_TARGET_IS_ESAME ? |
| 846 | S390X_UC_MCONTEXT_OFFSET : |
| 847 | S390_UC_MCONTEXT_OFFSET); |
| 848 | } |
| 849 | else |
| 850 | { |
| 851 | /* read sigcontext->sregs */ |
| 852 | temp_sregs = ADDR_BITS_REMOVE ((CORE_ADDR) |
| 853 | read_memory_integer (scontext |
| 854 | + |
| 855 | (GDB_TARGET_IS_ESAME |
| 856 | ? |
| 857 | S390X_SIGCONTEXT_SREGS_OFFSET |
| 858 | : |
| 859 | S390_SIGCONTEXT_SREGS_OFFSET), |
| 860 | S390_GPR_SIZE)); |
| 861 | |
| 862 | } |
| 863 | /* read sigregs->psw.addr */ |
| 864 | *sigcaller_pc = |
| 865 | ADDR_BITS_REMOVE ((CORE_ADDR) |
| 866 | read_memory_integer (temp_sregs + |
| 867 | REGISTER_BYTE |
| 868 | (S390_PC_REGNUM), |
| 869 | S390_PSW_ADDR_SIZE)); |
| 870 | } |
| 871 | } |
| 872 | retval = 1; |
| 873 | } |
| 874 | if (sregs) |
| 875 | *sregs = temp_sregs; |
| 876 | return retval; |
| 877 | } |
| 878 | |
| 879 | /* |
| 880 | We need to do something better here but this will keep us out of trouble |
| 881 | for the moment. |
| 882 | For some reason the blockframe.c calls us with fi->next->fromleaf |
| 883 | so this seems of little use to us. */ |
| 884 | CORE_ADDR |
| 885 | s390_init_frame_pc_first (int next_fromleaf, struct frame_info *fi) |
| 886 | { |
| 887 | CORE_ADDR sigcaller_pc; |
| 888 | CORE_ADDR pc = 0; |
| 889 | if (next_fromleaf) |
| 890 | { |
| 891 | pc = ADDR_BITS_REMOVE (read_register (S390_RETADDR_REGNUM)); |
| 892 | /* fix signal handlers */ |
| 893 | } |
| 894 | else if (get_next_frame (fi) && get_frame_pc (get_next_frame (fi))) |
| 895 | pc = s390_frame_saved_pc_nofix (get_next_frame (fi)); |
| 896 | if (pc && get_next_frame (fi) && get_frame_base (get_next_frame (fi)) |
| 897 | && s390_is_sigreturn (pc, get_next_frame (fi), NULL, &sigcaller_pc)) |
| 898 | { |
| 899 | pc = sigcaller_pc; |
| 900 | } |
| 901 | return pc; |
| 902 | } |
| 903 | |
| 904 | void |
| 905 | s390_init_extra_frame_info (int fromleaf, struct frame_info *fi) |
| 906 | { |
| 907 | fi->extra_info = frame_obstack_alloc (sizeof (struct frame_extra_info)); |
| 908 | if (fi->pc) |
| 909 | s390_get_frame_info (s390_sniff_pc_function_start (fi->pc, fi), |
| 910 | fi->extra_info, fi, 1); |
| 911 | else |
| 912 | s390_memset_extra_info (fi->extra_info); |
| 913 | } |
| 914 | |
| 915 | /* If saved registers of frame FI are not known yet, read and cache them. |
| 916 | &FEXTRA_INFOP contains struct frame_extra_info; TDATAP can be NULL, |
| 917 | in which case the framedata are read. */ |
| 918 | |
| 919 | void |
| 920 | s390_frame_init_saved_regs (struct frame_info *fi) |
| 921 | { |
| 922 | |
| 923 | int quick; |
| 924 | |
| 925 | if (fi->saved_regs == NULL) |
| 926 | { |
| 927 | /* zalloc memsets the saved regs */ |
| 928 | frame_saved_regs_zalloc (fi); |
| 929 | if (fi->pc) |
| 930 | { |
| 931 | quick = (fi->extra_info && fi->extra_info->initialised |
| 932 | && fi->extra_info->good_prologue); |
| 933 | s390_get_frame_info (quick ? fi->extra_info->function_start : |
| 934 | s390_sniff_pc_function_start (fi->pc, fi), |
| 935 | fi->extra_info, fi, !quick); |
| 936 | } |
| 937 | } |
| 938 | } |
| 939 | |
| 940 | |
| 941 | |
| 942 | CORE_ADDR |
| 943 | s390_frame_args_address (struct frame_info *fi) |
| 944 | { |
| 945 | |
| 946 | /* Apparently gdb already knows gdb_args_offset itself */ |
| 947 | return fi->frame; |
| 948 | } |
| 949 | |
| 950 | |
| 951 | static CORE_ADDR |
| 952 | s390_frame_saved_pc_nofix (struct frame_info *fi) |
| 953 | { |
| 954 | if (fi->extra_info && fi->extra_info->saved_pc_valid) |
| 955 | return fi->extra_info->saved_pc; |
| 956 | |
| 957 | if (deprecated_generic_find_dummy_frame (fi->pc, fi->frame)) |
| 958 | return deprecated_read_register_dummy (fi->pc, fi->frame, S390_PC_REGNUM); |
| 959 | |
| 960 | s390_frame_init_saved_regs (fi); |
| 961 | if (fi->extra_info) |
| 962 | { |
| 963 | fi->extra_info->saved_pc_valid = 1; |
| 964 | if (fi->extra_info->good_prologue |
| 965 | && fi->saved_regs[S390_RETADDR_REGNUM]) |
| 966 | fi->extra_info->saved_pc |
| 967 | = ADDR_BITS_REMOVE (read_memory_integer |
| 968 | (fi->saved_regs[S390_RETADDR_REGNUM], |
| 969 | S390_GPR_SIZE)); |
| 970 | else |
| 971 | fi->extra_info->saved_pc |
| 972 | = ADDR_BITS_REMOVE (read_register (S390_RETADDR_REGNUM)); |
| 973 | return fi->extra_info->saved_pc; |
| 974 | } |
| 975 | return 0; |
| 976 | } |
| 977 | |
| 978 | CORE_ADDR |
| 979 | s390_frame_saved_pc (struct frame_info *fi) |
| 980 | { |
| 981 | CORE_ADDR saved_pc = 0, sig_pc; |
| 982 | |
| 983 | if (fi->extra_info && fi->extra_info->sig_fixed_saved_pc_valid) |
| 984 | return fi->extra_info->sig_fixed_saved_pc; |
| 985 | saved_pc = s390_frame_saved_pc_nofix (fi); |
| 986 | |
| 987 | if (fi->extra_info) |
| 988 | { |
| 989 | fi->extra_info->sig_fixed_saved_pc_valid = 1; |
| 990 | if (saved_pc) |
| 991 | { |
| 992 | if (s390_is_sigreturn (saved_pc, fi, NULL, &sig_pc)) |
| 993 | saved_pc = sig_pc; |
| 994 | } |
| 995 | fi->extra_info->sig_fixed_saved_pc = saved_pc; |
| 996 | } |
| 997 | return saved_pc; |
| 998 | } |
| 999 | |
| 1000 | |
| 1001 | |
| 1002 | |
| 1003 | /* We want backtraces out of signal handlers so we don't set |
| 1004 | (get_frame_type (thisframe) == SIGTRAMP_FRAME) to 1 */ |
| 1005 | |
| 1006 | CORE_ADDR |
| 1007 | s390_frame_chain (struct frame_info *thisframe) |
| 1008 | { |
| 1009 | CORE_ADDR prev_fp = 0; |
| 1010 | |
| 1011 | if (deprecated_generic_find_dummy_frame (thisframe->pc, thisframe->frame)) |
| 1012 | return deprecated_read_register_dummy (thisframe->pc, thisframe->frame, |
| 1013 | S390_SP_REGNUM); |
| 1014 | else |
| 1015 | { |
| 1016 | int sigreturn = 0; |
| 1017 | CORE_ADDR sregs = 0; |
| 1018 | struct frame_extra_info prev_fextra_info; |
| 1019 | |
| 1020 | memset (&prev_fextra_info, 0, sizeof (prev_fextra_info)); |
| 1021 | if (thisframe->pc) |
| 1022 | { |
| 1023 | CORE_ADDR saved_pc, sig_pc; |
| 1024 | |
| 1025 | saved_pc = s390_frame_saved_pc_nofix (thisframe); |
| 1026 | if (saved_pc) |
| 1027 | { |
| 1028 | if ((sigreturn = |
| 1029 | s390_is_sigreturn (saved_pc, thisframe, &sregs, &sig_pc))) |
| 1030 | saved_pc = sig_pc; |
| 1031 | s390_get_frame_info (s390_sniff_pc_function_start |
| 1032 | (saved_pc, NULL), &prev_fextra_info, NULL, |
| 1033 | 1); |
| 1034 | } |
| 1035 | } |
| 1036 | if (sigreturn) |
| 1037 | { |
| 1038 | /* read sigregs,regs.gprs[11 or 15] */ |
| 1039 | prev_fp = read_memory_integer (sregs + |
| 1040 | REGISTER_BYTE (S390_GP0_REGNUM + |
| 1041 | (prev_fextra_info. |
| 1042 | frame_pointer_saved_pc |
| 1043 | ? 11 : 15)), |
| 1044 | S390_GPR_SIZE); |
| 1045 | thisframe->extra_info->sigcontext = sregs; |
| 1046 | } |
| 1047 | else |
| 1048 | { |
| 1049 | if (thisframe->saved_regs) |
| 1050 | { |
| 1051 | int regno; |
| 1052 | |
| 1053 | if (prev_fextra_info.frame_pointer_saved_pc |
| 1054 | && thisframe->saved_regs[S390_FRAME_REGNUM]) |
| 1055 | regno = S390_FRAME_REGNUM; |
| 1056 | else |
| 1057 | regno = S390_SP_REGNUM; |
| 1058 | |
| 1059 | if (thisframe->saved_regs[regno]) |
| 1060 | { |
| 1061 | /* The SP's entry of `saved_regs' is special. */ |
| 1062 | if (regno == S390_SP_REGNUM) |
| 1063 | prev_fp = thisframe->saved_regs[regno]; |
| 1064 | else |
| 1065 | prev_fp = |
| 1066 | read_memory_integer (thisframe->saved_regs[regno], |
| 1067 | S390_GPR_SIZE); |
| 1068 | } |
| 1069 | } |
| 1070 | } |
| 1071 | } |
| 1072 | return ADDR_BITS_REMOVE (prev_fp); |
| 1073 | } |
| 1074 | |
| 1075 | /* |
| 1076 | Whether struct frame_extra_info is actually needed I'll have to figure |
| 1077 | out as our frames are similar to rs6000 there is a possibility |
| 1078 | i386 dosen't need it. */ |
| 1079 | |
| 1080 | |
| 1081 | |
| 1082 | /* a given return value in `regbuf' with a type `valtype', extract and copy its |
| 1083 | value into `valbuf' */ |
| 1084 | void |
| 1085 | s390_extract_return_value (struct type *valtype, char *regbuf, char *valbuf) |
| 1086 | { |
| 1087 | /* floats and doubles are returned in fpr0. fpr's have a size of 8 bytes. |
| 1088 | We need to truncate the return value into float size (4 byte) if |
| 1089 | necessary. */ |
| 1090 | int len = TYPE_LENGTH (valtype); |
| 1091 | |
| 1092 | if (TYPE_CODE (valtype) == TYPE_CODE_FLT) |
| 1093 | memcpy (valbuf, ®buf[REGISTER_BYTE (S390_FP0_REGNUM)], len); |
| 1094 | else |
| 1095 | { |
| 1096 | int offset = 0; |
| 1097 | /* return value is copied starting from r2. */ |
| 1098 | if (TYPE_LENGTH (valtype) < S390_GPR_SIZE) |
| 1099 | offset = S390_GPR_SIZE - TYPE_LENGTH (valtype); |
| 1100 | memcpy (valbuf, |
| 1101 | regbuf + REGISTER_BYTE (S390_GP0_REGNUM + 2) + offset, |
| 1102 | TYPE_LENGTH (valtype)); |
| 1103 | } |
| 1104 | } |
| 1105 | |
| 1106 | |
| 1107 | static char * |
| 1108 | s390_promote_integer_argument (struct type *valtype, char *valbuf, |
| 1109 | char *reg_buff, int *arglen) |
| 1110 | { |
| 1111 | char *value = valbuf; |
| 1112 | int len = TYPE_LENGTH (valtype); |
| 1113 | |
| 1114 | if (len < S390_GPR_SIZE) |
| 1115 | { |
| 1116 | /* We need to upgrade this value to a register to pass it correctly */ |
| 1117 | int idx, diff = S390_GPR_SIZE - len, negative = |
| 1118 | (!TYPE_UNSIGNED (valtype) && value[0] & 0x80); |
| 1119 | for (idx = 0; idx < S390_GPR_SIZE; idx++) |
| 1120 | { |
| 1121 | reg_buff[idx] = (idx < diff ? (negative ? 0xff : 0x0) : |
| 1122 | value[idx - diff]); |
| 1123 | } |
| 1124 | value = reg_buff; |
| 1125 | *arglen = S390_GPR_SIZE; |
| 1126 | } |
| 1127 | else |
| 1128 | { |
| 1129 | if (len & (S390_GPR_SIZE - 1)) |
| 1130 | { |
| 1131 | fprintf_unfiltered (gdb_stderr, |
| 1132 | "s390_promote_integer_argument detected an argument not " |
| 1133 | "a multiple of S390_GPR_SIZE & greater than S390_GPR_SIZE " |
| 1134 | "we might not deal with this correctly.\n"); |
| 1135 | } |
| 1136 | *arglen = len; |
| 1137 | } |
| 1138 | |
| 1139 | return (value); |
| 1140 | } |
| 1141 | |
| 1142 | void |
| 1143 | s390_store_return_value (struct type *valtype, char *valbuf) |
| 1144 | { |
| 1145 | int arglen; |
| 1146 | char *reg_buff = alloca (max (S390_FPR_SIZE, REGISTER_SIZE)), *value; |
| 1147 | |
| 1148 | if (TYPE_CODE (valtype) == TYPE_CODE_FLT) |
| 1149 | { |
| 1150 | if (TYPE_LENGTH (valtype) == 4 |
| 1151 | || TYPE_LENGTH (valtype) == 8) |
| 1152 | deprecated_write_register_bytes (REGISTER_BYTE (S390_FP0_REGNUM), |
| 1153 | valbuf, TYPE_LENGTH (valtype)); |
| 1154 | else |
| 1155 | error ("GDB is unable to return `long double' values " |
| 1156 | "on this architecture."); |
| 1157 | } |
| 1158 | else |
| 1159 | { |
| 1160 | value = |
| 1161 | s390_promote_integer_argument (valtype, valbuf, reg_buff, &arglen); |
| 1162 | /* Everything else is returned in GPR2 and up. */ |
| 1163 | deprecated_write_register_bytes (REGISTER_BYTE (S390_GP0_REGNUM + 2), |
| 1164 | value, arglen); |
| 1165 | } |
| 1166 | } |
| 1167 | static int |
| 1168 | gdb_print_insn_s390 (bfd_vma memaddr, disassemble_info * info) |
| 1169 | { |
| 1170 | bfd_byte instrbuff[S390_MAX_INSTR_SIZE]; |
| 1171 | int instrlen, cnt; |
| 1172 | |
| 1173 | instrlen = s390_readinstruction (instrbuff, (CORE_ADDR) memaddr, info); |
| 1174 | if (instrlen < 0) |
| 1175 | { |
| 1176 | (*info->memory_error_func) (instrlen, memaddr, info); |
| 1177 | return -1; |
| 1178 | } |
| 1179 | for (cnt = 0; cnt < instrlen; cnt++) |
| 1180 | info->fprintf_func (info->stream, "%02X ", instrbuff[cnt]); |
| 1181 | for (cnt = instrlen; cnt < S390_MAX_INSTR_SIZE; cnt++) |
| 1182 | info->fprintf_func (info->stream, " "); |
| 1183 | instrlen = print_insn_s390 (memaddr, info); |
| 1184 | return instrlen; |
| 1185 | } |
| 1186 | |
| 1187 | |
| 1188 | |
| 1189 | /* Not the most efficent code in the world */ |
| 1190 | int |
| 1191 | s390_fp_regnum (void) |
| 1192 | { |
| 1193 | int regno = S390_SP_REGNUM; |
| 1194 | struct frame_extra_info fextra_info; |
| 1195 | |
| 1196 | CORE_ADDR pc = ADDR_BITS_REMOVE (read_register (S390_PC_REGNUM)); |
| 1197 | |
| 1198 | s390_get_frame_info (s390_sniff_pc_function_start (pc, NULL), &fextra_info, |
| 1199 | NULL, 1); |
| 1200 | if (fextra_info.frame_pointer_saved_pc) |
| 1201 | regno = S390_FRAME_REGNUM; |
| 1202 | return regno; |
| 1203 | } |
| 1204 | |
| 1205 | CORE_ADDR |
| 1206 | s390_read_fp (void) |
| 1207 | { |
| 1208 | return read_register (s390_fp_regnum ()); |
| 1209 | } |
| 1210 | |
| 1211 | |
| 1212 | static void |
| 1213 | s390_pop_frame_regular (struct frame_info *frame) |
| 1214 | { |
| 1215 | int regnum; |
| 1216 | |
| 1217 | write_register (S390_PC_REGNUM, FRAME_SAVED_PC (frame)); |
| 1218 | |
| 1219 | /* Restore any saved registers. */ |
| 1220 | if (frame->saved_regs) |
| 1221 | { |
| 1222 | for (regnum = 0; regnum < NUM_REGS; regnum++) |
| 1223 | if (frame->saved_regs[regnum] != 0) |
| 1224 | { |
| 1225 | ULONGEST value; |
| 1226 | |
| 1227 | value = read_memory_unsigned_integer (frame->saved_regs[regnum], |
| 1228 | REGISTER_RAW_SIZE (regnum)); |
| 1229 | write_register (regnum, value); |
| 1230 | } |
| 1231 | |
| 1232 | /* Actually cut back the stack. Remember that the SP's element of |
| 1233 | saved_regs is the old SP itself, not the address at which it is |
| 1234 | saved. */ |
| 1235 | write_register (S390_SP_REGNUM, frame->saved_regs[S390_SP_REGNUM]); |
| 1236 | } |
| 1237 | |
| 1238 | /* Throw away any cached frame information. */ |
| 1239 | flush_cached_frames (); |
| 1240 | } |
| 1241 | |
| 1242 | |
| 1243 | /* Destroy the innermost (Top-Of-Stack) stack frame, restoring the |
| 1244 | machine state that was in effect before the frame was created. |
| 1245 | Used in the contexts of the "return" command, and of |
| 1246 | target function calls from the debugger. */ |
| 1247 | void |
| 1248 | s390_pop_frame (void) |
| 1249 | { |
| 1250 | /* This function checks for and handles generic dummy frames, and |
| 1251 | calls back to our function for ordinary frames. */ |
| 1252 | generic_pop_current_frame (s390_pop_frame_regular); |
| 1253 | } |
| 1254 | |
| 1255 | |
| 1256 | /* Return non-zero if TYPE is an integer-like type, zero otherwise. |
| 1257 | "Integer-like" types are those that should be passed the way |
| 1258 | integers are: integers, enums, ranges, characters, and booleans. */ |
| 1259 | static int |
| 1260 | is_integer_like (struct type *type) |
| 1261 | { |
| 1262 | enum type_code code = TYPE_CODE (type); |
| 1263 | |
| 1264 | return (code == TYPE_CODE_INT |
| 1265 | || code == TYPE_CODE_ENUM |
| 1266 | || code == TYPE_CODE_RANGE |
| 1267 | || code == TYPE_CODE_CHAR |
| 1268 | || code == TYPE_CODE_BOOL); |
| 1269 | } |
| 1270 | |
| 1271 | |
| 1272 | /* Return non-zero if TYPE is a pointer-like type, zero otherwise. |
| 1273 | "Pointer-like" types are those that should be passed the way |
| 1274 | pointers are: pointers and references. */ |
| 1275 | static int |
| 1276 | is_pointer_like (struct type *type) |
| 1277 | { |
| 1278 | enum type_code code = TYPE_CODE (type); |
| 1279 | |
| 1280 | return (code == TYPE_CODE_PTR |
| 1281 | || code == TYPE_CODE_REF); |
| 1282 | } |
| 1283 | |
| 1284 | |
| 1285 | /* Return non-zero if TYPE is a `float singleton' or `double |
| 1286 | singleton', zero otherwise. |
| 1287 | |
| 1288 | A `T singleton' is a struct type with one member, whose type is |
| 1289 | either T or a `T singleton'. So, the following are all float |
| 1290 | singletons: |
| 1291 | |
| 1292 | struct { float x }; |
| 1293 | struct { struct { float x; } x; }; |
| 1294 | struct { struct { struct { float x; } x; } x; }; |
| 1295 | |
| 1296 | ... and so on. |
| 1297 | |
| 1298 | WHY THE HECK DO WE CARE ABOUT THIS??? Well, it turns out that GCC |
| 1299 | passes all float singletons and double singletons as if they were |
| 1300 | simply floats or doubles. This is *not* what the ABI says it |
| 1301 | should do. */ |
| 1302 | static int |
| 1303 | is_float_singleton (struct type *type) |
| 1304 | { |
| 1305 | return (TYPE_CODE (type) == TYPE_CODE_STRUCT |
| 1306 | && TYPE_NFIELDS (type) == 1 |
| 1307 | && (TYPE_CODE (TYPE_FIELD_TYPE (type, 0)) == TYPE_CODE_FLT |
| 1308 | || is_float_singleton (TYPE_FIELD_TYPE (type, 0)))); |
| 1309 | } |
| 1310 | |
| 1311 | |
| 1312 | /* Return non-zero if TYPE is a struct-like type, zero otherwise. |
| 1313 | "Struct-like" types are those that should be passed as structs are: |
| 1314 | structs and unions. |
| 1315 | |
| 1316 | As an odd quirk, not mentioned in the ABI, GCC passes float and |
| 1317 | double singletons as if they were a plain float, double, etc. (The |
| 1318 | corresponding union types are handled normally.) So we exclude |
| 1319 | those types here. *shrug* */ |
| 1320 | static int |
| 1321 | is_struct_like (struct type *type) |
| 1322 | { |
| 1323 | enum type_code code = TYPE_CODE (type); |
| 1324 | |
| 1325 | return (code == TYPE_CODE_UNION |
| 1326 | || (code == TYPE_CODE_STRUCT && ! is_float_singleton (type))); |
| 1327 | } |
| 1328 | |
| 1329 | |
| 1330 | /* Return non-zero if TYPE is a float-like type, zero otherwise. |
| 1331 | "Float-like" types are those that should be passed as |
| 1332 | floating-point values are. |
| 1333 | |
| 1334 | You'd think this would just be floats, doubles, long doubles, etc. |
| 1335 | But as an odd quirk, not mentioned in the ABI, GCC passes float and |
| 1336 | double singletons as if they were a plain float, double, etc. (The |
| 1337 | corresponding union types are handled normally.) So we exclude |
| 1338 | those types here. *shrug* */ |
| 1339 | static int |
| 1340 | is_float_like (struct type *type) |
| 1341 | { |
| 1342 | return (TYPE_CODE (type) == TYPE_CODE_FLT |
| 1343 | || is_float_singleton (type)); |
| 1344 | } |
| 1345 | |
| 1346 | |
| 1347 | /* Return non-zero if TYPE is considered a `DOUBLE_OR_FLOAT', as |
| 1348 | defined by the parameter passing conventions described in the |
| 1349 | "GNU/Linux for S/390 ELF Application Binary Interface Supplement". |
| 1350 | Otherwise, return zero. */ |
| 1351 | static int |
| 1352 | is_double_or_float (struct type *type) |
| 1353 | { |
| 1354 | return (is_float_like (type) |
| 1355 | && (TYPE_LENGTH (type) == 4 |
| 1356 | || TYPE_LENGTH (type) == 8)); |
| 1357 | } |
| 1358 | |
| 1359 | |
| 1360 | /* Return non-zero if TYPE is considered a `SIMPLE_ARG', as defined by |
| 1361 | the parameter passing conventions described in the "GNU/Linux for |
| 1362 | S/390 ELF Application Binary Interface Supplement". Return zero |
| 1363 | otherwise. */ |
| 1364 | static int |
| 1365 | is_simple_arg (struct type *type) |
| 1366 | { |
| 1367 | unsigned length = TYPE_LENGTH (type); |
| 1368 | |
| 1369 | /* This is almost a direct translation of the ABI's language, except |
| 1370 | that we have to exclude 8-byte structs; those are DOUBLE_ARGs. */ |
| 1371 | return ((is_integer_like (type) && length <= 4) |
| 1372 | || is_pointer_like (type) |
| 1373 | || (is_struct_like (type) && length != 8) |
| 1374 | || (is_float_like (type) && length == 16)); |
| 1375 | } |
| 1376 | |
| 1377 | |
| 1378 | /* Return non-zero if TYPE should be passed as a pointer to a copy, |
| 1379 | zero otherwise. TYPE must be a SIMPLE_ARG, as recognized by |
| 1380 | `is_simple_arg'. */ |
| 1381 | static int |
| 1382 | pass_by_copy_ref (struct type *type) |
| 1383 | { |
| 1384 | unsigned length = TYPE_LENGTH (type); |
| 1385 | |
| 1386 | return ((is_struct_like (type) && length != 1 && length != 2 && length != 4) |
| 1387 | || (is_float_like (type) && length == 16)); |
| 1388 | } |
| 1389 | |
| 1390 | |
| 1391 | /* Return ARG, a `SIMPLE_ARG', sign-extended or zero-extended to a full |
| 1392 | word as required for the ABI. */ |
| 1393 | static LONGEST |
| 1394 | extend_simple_arg (struct value *arg) |
| 1395 | { |
| 1396 | struct type *type = VALUE_TYPE (arg); |
| 1397 | |
| 1398 | /* Even structs get passed in the least significant bits of the |
| 1399 | register / memory word. It's not really right to extract them as |
| 1400 | an integer, but it does take care of the extension. */ |
| 1401 | if (TYPE_UNSIGNED (type)) |
| 1402 | return extract_unsigned_integer (VALUE_CONTENTS (arg), |
| 1403 | TYPE_LENGTH (type)); |
| 1404 | else |
| 1405 | return extract_signed_integer (VALUE_CONTENTS (arg), |
| 1406 | TYPE_LENGTH (type)); |
| 1407 | } |
| 1408 | |
| 1409 | |
| 1410 | /* Return non-zero if TYPE is a `DOUBLE_ARG', as defined by the |
| 1411 | parameter passing conventions described in the "GNU/Linux for S/390 |
| 1412 | ELF Application Binary Interface Supplement". Return zero |
| 1413 | otherwise. */ |
| 1414 | static int |
| 1415 | is_double_arg (struct type *type) |
| 1416 | { |
| 1417 | unsigned length = TYPE_LENGTH (type); |
| 1418 | |
| 1419 | return ((is_integer_like (type) |
| 1420 | || is_struct_like (type)) |
| 1421 | && length == 8); |
| 1422 | } |
| 1423 | |
| 1424 | |
| 1425 | /* Round ADDR up to the next N-byte boundary. N must be a power of |
| 1426 | two. */ |
| 1427 | static CORE_ADDR |
| 1428 | round_up (CORE_ADDR addr, int n) |
| 1429 | { |
| 1430 | /* Check that N is really a power of two. */ |
| 1431 | gdb_assert (n && (n & (n-1)) == 0); |
| 1432 | return ((addr + n - 1) & -n); |
| 1433 | } |
| 1434 | |
| 1435 | |
| 1436 | /* Round ADDR down to the next N-byte boundary. N must be a power of |
| 1437 | two. */ |
| 1438 | static CORE_ADDR |
| 1439 | round_down (CORE_ADDR addr, int n) |
| 1440 | { |
| 1441 | /* Check that N is really a power of two. */ |
| 1442 | gdb_assert (n && (n & (n-1)) == 0); |
| 1443 | return (addr & -n); |
| 1444 | } |
| 1445 | |
| 1446 | |
| 1447 | /* Return the alignment required by TYPE. */ |
| 1448 | static int |
| 1449 | alignment_of (struct type *type) |
| 1450 | { |
| 1451 | int alignment; |
| 1452 | |
| 1453 | if (is_integer_like (type) |
| 1454 | || is_pointer_like (type) |
| 1455 | || TYPE_CODE (type) == TYPE_CODE_FLT) |
| 1456 | alignment = TYPE_LENGTH (type); |
| 1457 | else if (TYPE_CODE (type) == TYPE_CODE_STRUCT |
| 1458 | || TYPE_CODE (type) == TYPE_CODE_UNION) |
| 1459 | { |
| 1460 | int i; |
| 1461 | |
| 1462 | alignment = 1; |
| 1463 | for (i = 0; i < TYPE_NFIELDS (type); i++) |
| 1464 | { |
| 1465 | int field_alignment = alignment_of (TYPE_FIELD_TYPE (type, i)); |
| 1466 | |
| 1467 | if (field_alignment > alignment) |
| 1468 | alignment = field_alignment; |
| 1469 | } |
| 1470 | } |
| 1471 | else |
| 1472 | alignment = 1; |
| 1473 | |
| 1474 | /* Check that everything we ever return is a power of two. Lots of |
| 1475 | code doesn't want to deal with aligning things to arbitrary |
| 1476 | boundaries. */ |
| 1477 | gdb_assert ((alignment & (alignment - 1)) == 0); |
| 1478 | |
| 1479 | return alignment; |
| 1480 | } |
| 1481 | |
| 1482 | |
| 1483 | /* Put the actual parameter values pointed to by ARGS[0..NARGS-1] in |
| 1484 | place to be passed to a function, as specified by the "GNU/Linux |
| 1485 | for S/390 ELF Application Binary Interface Supplement". |
| 1486 | |
| 1487 | SP is the current stack pointer. We must put arguments, links, |
| 1488 | padding, etc. whereever they belong, and return the new stack |
| 1489 | pointer value. |
| 1490 | |
| 1491 | If STRUCT_RETURN is non-zero, then the function we're calling is |
| 1492 | going to return a structure by value; STRUCT_ADDR is the address of |
| 1493 | a block we've allocated for it on the stack. |
| 1494 | |
| 1495 | Our caller has taken care of any type promotions needed to satisfy |
| 1496 | prototypes or the old K&R argument-passing rules. */ |
| 1497 | CORE_ADDR |
| 1498 | s390_push_arguments (int nargs, struct value **args, CORE_ADDR sp, |
| 1499 | int struct_return, CORE_ADDR struct_addr) |
| 1500 | { |
| 1501 | int i; |
| 1502 | int pointer_size = (TARGET_PTR_BIT / TARGET_CHAR_BIT); |
| 1503 | |
| 1504 | /* The number of arguments passed by reference-to-copy. */ |
| 1505 | int num_copies; |
| 1506 | |
| 1507 | /* If the i'th argument is passed as a reference to a copy, then |
| 1508 | copy_addr[i] is the address of the copy we made. */ |
| 1509 | CORE_ADDR *copy_addr = alloca (nargs * sizeof (CORE_ADDR)); |
| 1510 | |
| 1511 | /* Build the reference-to-copy area. */ |
| 1512 | num_copies = 0; |
| 1513 | for (i = 0; i < nargs; i++) |
| 1514 | { |
| 1515 | struct value *arg = args[i]; |
| 1516 | struct type *type = VALUE_TYPE (arg); |
| 1517 | unsigned length = TYPE_LENGTH (type); |
| 1518 | |
| 1519 | if (is_simple_arg (type) |
| 1520 | && pass_by_copy_ref (type)) |
| 1521 | { |
| 1522 | sp -= length; |
| 1523 | sp = round_down (sp, alignment_of (type)); |
| 1524 | write_memory (sp, VALUE_CONTENTS (arg), length); |
| 1525 | copy_addr[i] = sp; |
| 1526 | num_copies++; |
| 1527 | } |
| 1528 | } |
| 1529 | |
| 1530 | /* Reserve space for the parameter area. As a conservative |
| 1531 | simplification, we assume that everything will be passed on the |
| 1532 | stack. */ |
| 1533 | { |
| 1534 | int i; |
| 1535 | |
| 1536 | for (i = 0; i < nargs; i++) |
| 1537 | { |
| 1538 | struct value *arg = args[i]; |
| 1539 | struct type *type = VALUE_TYPE (arg); |
| 1540 | int length = TYPE_LENGTH (type); |
| 1541 | |
| 1542 | sp = round_down (sp, alignment_of (type)); |
| 1543 | |
| 1544 | /* SIMPLE_ARG values get extended to 32 bits. Assume every |
| 1545 | argument is. */ |
| 1546 | if (length < 4) length = 4; |
| 1547 | sp -= length; |
| 1548 | } |
| 1549 | } |
| 1550 | |
| 1551 | /* Include space for any reference-to-copy pointers. */ |
| 1552 | sp = round_down (sp, pointer_size); |
| 1553 | sp -= num_copies * pointer_size; |
| 1554 | |
| 1555 | /* After all that, make sure it's still aligned on an eight-byte |
| 1556 | boundary. */ |
| 1557 | sp = round_down (sp, 8); |
| 1558 | |
| 1559 | /* Finally, place the actual parameters, working from SP towards |
| 1560 | higher addresses. The code above is supposed to reserve enough |
| 1561 | space for this. */ |
| 1562 | { |
| 1563 | int fr = 0; |
| 1564 | int gr = 2; |
| 1565 | CORE_ADDR starg = sp; |
| 1566 | |
| 1567 | for (i = 0; i < nargs; i++) |
| 1568 | { |
| 1569 | struct value *arg = args[i]; |
| 1570 | struct type *type = VALUE_TYPE (arg); |
| 1571 | |
| 1572 | if (is_double_or_float (type) |
| 1573 | && fr <= 2) |
| 1574 | { |
| 1575 | /* When we store a single-precision value in an FP register, |
| 1576 | it occupies the leftmost bits. */ |
| 1577 | deprecated_write_register_bytes (REGISTER_BYTE (S390_FP0_REGNUM + fr), |
| 1578 | VALUE_CONTENTS (arg), |
| 1579 | TYPE_LENGTH (type)); |
| 1580 | fr += 2; |
| 1581 | } |
| 1582 | else if (is_simple_arg (type) |
| 1583 | && gr <= 6) |
| 1584 | { |
| 1585 | /* Do we need to pass a pointer to our copy of this |
| 1586 | argument? */ |
| 1587 | if (pass_by_copy_ref (type)) |
| 1588 | write_register (S390_GP0_REGNUM + gr, copy_addr[i]); |
| 1589 | else |
| 1590 | write_register (S390_GP0_REGNUM + gr, extend_simple_arg (arg)); |
| 1591 | |
| 1592 | gr++; |
| 1593 | } |
| 1594 | else if (is_double_arg (type) |
| 1595 | && gr <= 5) |
| 1596 | { |
| 1597 | deprecated_write_register_gen (S390_GP0_REGNUM + gr, |
| 1598 | VALUE_CONTENTS (arg)); |
| 1599 | deprecated_write_register_gen (S390_GP0_REGNUM + gr + 1, |
| 1600 | VALUE_CONTENTS (arg) + 4); |
| 1601 | gr += 2; |
| 1602 | } |
| 1603 | else |
| 1604 | { |
| 1605 | /* The `OTHER' case. */ |
| 1606 | enum type_code code = TYPE_CODE (type); |
| 1607 | unsigned length = TYPE_LENGTH (type); |
| 1608 | |
| 1609 | /* If we skipped r6 because we couldn't fit a DOUBLE_ARG |
| 1610 | in it, then don't go back and use it again later. */ |
| 1611 | if (is_double_arg (type) && gr == 6) |
| 1612 | gr = 7; |
| 1613 | |
| 1614 | if (is_simple_arg (type)) |
| 1615 | { |
| 1616 | /* Simple args are always either extended to 32 bits, |
| 1617 | or pointers. */ |
| 1618 | starg = round_up (starg, 4); |
| 1619 | |
| 1620 | /* Do we need to pass a pointer to our copy of this |
| 1621 | argument? */ |
| 1622 | if (pass_by_copy_ref (type)) |
| 1623 | write_memory_signed_integer (starg, pointer_size, |
| 1624 | copy_addr[i]); |
| 1625 | else |
| 1626 | /* Simple args are always extended to 32 bits. */ |
| 1627 | write_memory_signed_integer (starg, 4, |
| 1628 | extend_simple_arg (arg)); |
| 1629 | starg += 4; |
| 1630 | } |
| 1631 | else |
| 1632 | { |
| 1633 | /* You'd think we should say: |
| 1634 | starg = round_up (starg, alignment_of (type)); |
| 1635 | Unfortunately, GCC seems to simply align the stack on |
| 1636 | a four-byte boundary, even when passing doubles. */ |
| 1637 | starg = round_up (starg, 4); |
| 1638 | write_memory (starg, VALUE_CONTENTS (arg), length); |
| 1639 | starg += length; |
| 1640 | } |
| 1641 | } |
| 1642 | } |
| 1643 | } |
| 1644 | |
| 1645 | /* Allocate the standard frame areas: the register save area, the |
| 1646 | word reserved for the compiler (which seems kind of meaningless), |
| 1647 | and the back chain pointer. */ |
| 1648 | sp -= 96; |
| 1649 | |
| 1650 | /* Write the back chain pointer into the first word of the stack |
| 1651 | frame. This will help us get backtraces from within functions |
| 1652 | called from GDB. */ |
| 1653 | write_memory_unsigned_integer (sp, (TARGET_PTR_BIT / TARGET_CHAR_BIT), |
| 1654 | read_fp ()); |
| 1655 | |
| 1656 | return sp; |
| 1657 | } |
| 1658 | |
| 1659 | |
| 1660 | static int |
| 1661 | s390_use_struct_convention (int gcc_p, struct type *value_type) |
| 1662 | { |
| 1663 | enum type_code code = TYPE_CODE (value_type); |
| 1664 | |
| 1665 | return (code == TYPE_CODE_STRUCT |
| 1666 | || code == TYPE_CODE_UNION); |
| 1667 | } |
| 1668 | |
| 1669 | |
| 1670 | /* Return the GDB type object for the "standard" data type |
| 1671 | of data in register N. */ |
| 1672 | struct type * |
| 1673 | s390_register_virtual_type (int regno) |
| 1674 | { |
| 1675 | if (S390_FP0_REGNUM <= regno && regno < S390_FP0_REGNUM + S390_NUM_FPRS) |
| 1676 | return builtin_type_double; |
| 1677 | else |
| 1678 | return builtin_type_int; |
| 1679 | } |
| 1680 | |
| 1681 | |
| 1682 | struct type * |
| 1683 | s390x_register_virtual_type (int regno) |
| 1684 | { |
| 1685 | return (regno == S390_FPC_REGNUM) || |
| 1686 | (regno >= S390_FIRST_ACR && regno <= S390_LAST_ACR) ? builtin_type_int : |
| 1687 | (regno >= S390_FP0_REGNUM) ? builtin_type_double : builtin_type_long; |
| 1688 | } |
| 1689 | |
| 1690 | |
| 1691 | |
| 1692 | void |
| 1693 | s390_store_struct_return (CORE_ADDR addr, CORE_ADDR sp) |
| 1694 | { |
| 1695 | write_register (S390_GP0_REGNUM + 2, addr); |
| 1696 | } |
| 1697 | |
| 1698 | |
| 1699 | |
| 1700 | const static unsigned char * |
| 1701 | s390_breakpoint_from_pc (CORE_ADDR *pcptr, int *lenptr) |
| 1702 | { |
| 1703 | static unsigned char breakpoint[] = { 0x0, 0x1 }; |
| 1704 | |
| 1705 | *lenptr = sizeof (breakpoint); |
| 1706 | return breakpoint; |
| 1707 | } |
| 1708 | |
| 1709 | /* Advance PC across any function entry prologue instructions to reach some |
| 1710 | "real" code. */ |
| 1711 | CORE_ADDR |
| 1712 | s390_skip_prologue (CORE_ADDR pc) |
| 1713 | { |
| 1714 | struct frame_extra_info fextra_info; |
| 1715 | |
| 1716 | s390_get_frame_info (pc, &fextra_info, NULL, 1); |
| 1717 | return fextra_info.skip_prologue_function_start; |
| 1718 | } |
| 1719 | |
| 1720 | /* Immediately after a function call, return the saved pc. |
| 1721 | Can't go through the frames for this because on some machines |
| 1722 | the new frame is not set up until the new function executes |
| 1723 | some instructions. */ |
| 1724 | CORE_ADDR |
| 1725 | s390_saved_pc_after_call (struct frame_info *frame) |
| 1726 | { |
| 1727 | return ADDR_BITS_REMOVE (read_register (S390_RETADDR_REGNUM)); |
| 1728 | } |
| 1729 | |
| 1730 | static CORE_ADDR |
| 1731 | s390_addr_bits_remove (CORE_ADDR addr) |
| 1732 | { |
| 1733 | return (addr) & 0x7fffffff; |
| 1734 | } |
| 1735 | |
| 1736 | |
| 1737 | static CORE_ADDR |
| 1738 | s390_push_return_address (CORE_ADDR pc, CORE_ADDR sp) |
| 1739 | { |
| 1740 | write_register (S390_RETADDR_REGNUM, CALL_DUMMY_ADDRESS ()); |
| 1741 | return sp; |
| 1742 | } |
| 1743 | |
| 1744 | struct gdbarch * |
| 1745 | s390_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches) |
| 1746 | { |
| 1747 | static LONGEST s390_call_dummy_words[] = { 0 }; |
| 1748 | struct gdbarch *gdbarch; |
| 1749 | struct gdbarch_tdep *tdep; |
| 1750 | int elf_flags; |
| 1751 | |
| 1752 | /* First see if there is already a gdbarch that can satisfy the request. */ |
| 1753 | arches = gdbarch_list_lookup_by_info (arches, &info); |
| 1754 | if (arches != NULL) |
| 1755 | return arches->gdbarch; |
| 1756 | |
| 1757 | /* None found: is the request for a s390 architecture? */ |
| 1758 | if (info.bfd_arch_info->arch != bfd_arch_s390) |
| 1759 | return NULL; /* No; then it's not for us. */ |
| 1760 | |
| 1761 | /* Yes: create a new gdbarch for the specified machine type. */ |
| 1762 | gdbarch = gdbarch_alloc (&info, NULL); |
| 1763 | |
| 1764 | /* NOTE: cagney/2002-12-06: This can be deleted when this arch is |
| 1765 | ready to unwind the PC first (see frame.c:get_prev_frame()). */ |
| 1766 | set_gdbarch_deprecated_init_frame_pc (gdbarch, init_frame_pc_default); |
| 1767 | |
| 1768 | set_gdbarch_believe_pcc_promotion (gdbarch, 0); |
| 1769 | set_gdbarch_char_signed (gdbarch, 0); |
| 1770 | |
| 1771 | set_gdbarch_frame_args_skip (gdbarch, 0); |
| 1772 | set_gdbarch_frame_args_address (gdbarch, s390_frame_args_address); |
| 1773 | set_gdbarch_frame_chain (gdbarch, s390_frame_chain); |
| 1774 | set_gdbarch_frame_init_saved_regs (gdbarch, s390_frame_init_saved_regs); |
| 1775 | set_gdbarch_frame_locals_address (gdbarch, s390_frame_args_address); |
| 1776 | /* We can't do this */ |
| 1777 | set_gdbarch_frame_num_args (gdbarch, frame_num_args_unknown); |
| 1778 | set_gdbarch_store_struct_return (gdbarch, s390_store_struct_return); |
| 1779 | set_gdbarch_deprecated_extract_return_value (gdbarch, s390_extract_return_value); |
| 1780 | set_gdbarch_deprecated_store_return_value (gdbarch, s390_store_return_value); |
| 1781 | /* Amount PC must be decremented by after a breakpoint. |
| 1782 | This is often the number of bytes in BREAKPOINT |
| 1783 | but not always. */ |
| 1784 | set_gdbarch_decr_pc_after_break (gdbarch, 2); |
| 1785 | set_gdbarch_pop_frame (gdbarch, s390_pop_frame); |
| 1786 | /* Stack grows downward. */ |
| 1787 | set_gdbarch_inner_than (gdbarch, core_addr_lessthan); |
| 1788 | /* Offset from address of function to start of its code. |
| 1789 | Zero on most machines. */ |
| 1790 | set_gdbarch_function_start_offset (gdbarch, 0); |
| 1791 | set_gdbarch_max_register_raw_size (gdbarch, 8); |
| 1792 | set_gdbarch_max_register_virtual_size (gdbarch, 8); |
| 1793 | set_gdbarch_breakpoint_from_pc (gdbarch, s390_breakpoint_from_pc); |
| 1794 | set_gdbarch_skip_prologue (gdbarch, s390_skip_prologue); |
| 1795 | set_gdbarch_init_extra_frame_info (gdbarch, s390_init_extra_frame_info); |
| 1796 | set_gdbarch_deprecated_init_frame_pc_first (gdbarch, s390_init_frame_pc_first); |
| 1797 | set_gdbarch_read_fp (gdbarch, s390_read_fp); |
| 1798 | /* This function that tells us whether the function invocation represented |
| 1799 | by FI does not have a frame on the stack associated with it. If it |
| 1800 | does not, FRAMELESS is set to 1, else 0. */ |
| 1801 | set_gdbarch_frameless_function_invocation (gdbarch, |
| 1802 | s390_frameless_function_invocation); |
| 1803 | /* Return saved PC from a frame */ |
| 1804 | set_gdbarch_frame_saved_pc (gdbarch, s390_frame_saved_pc); |
| 1805 | /* FRAME_CHAIN takes a frame's nominal address |
| 1806 | and produces the frame's chain-pointer. */ |
| 1807 | set_gdbarch_frame_chain (gdbarch, s390_frame_chain); |
| 1808 | set_gdbarch_saved_pc_after_call (gdbarch, s390_saved_pc_after_call); |
| 1809 | set_gdbarch_register_byte (gdbarch, s390_register_byte); |
| 1810 | set_gdbarch_pc_regnum (gdbarch, S390_PC_REGNUM); |
| 1811 | set_gdbarch_sp_regnum (gdbarch, S390_SP_REGNUM); |
| 1812 | set_gdbarch_fp_regnum (gdbarch, S390_FP_REGNUM); |
| 1813 | set_gdbarch_fp0_regnum (gdbarch, S390_FP0_REGNUM); |
| 1814 | set_gdbarch_num_regs (gdbarch, S390_NUM_REGS); |
| 1815 | set_gdbarch_cannot_fetch_register (gdbarch, s390_cannot_fetch_register); |
| 1816 | set_gdbarch_cannot_store_register (gdbarch, s390_cannot_fetch_register); |
| 1817 | set_gdbarch_use_struct_convention (gdbarch, s390_use_struct_convention); |
| 1818 | set_gdbarch_frame_chain_valid (gdbarch, func_frame_chain_valid); |
| 1819 | set_gdbarch_register_name (gdbarch, s390_register_name); |
| 1820 | set_gdbarch_stab_reg_to_regnum (gdbarch, s390_stab_reg_to_regnum); |
| 1821 | set_gdbarch_dwarf_reg_to_regnum (gdbarch, s390_stab_reg_to_regnum); |
| 1822 | set_gdbarch_dwarf2_reg_to_regnum (gdbarch, s390_stab_reg_to_regnum); |
| 1823 | set_gdbarch_deprecated_extract_struct_value_address |
| 1824 | (gdbarch, generic_cannot_extract_struct_value_address); |
| 1825 | |
| 1826 | /* Parameters for inferior function calls. */ |
| 1827 | set_gdbarch_call_dummy_p (gdbarch, 1); |
| 1828 | set_gdbarch_call_dummy_length (gdbarch, 0); |
| 1829 | set_gdbarch_call_dummy_address (gdbarch, entry_point_address); |
| 1830 | set_gdbarch_call_dummy_start_offset (gdbarch, 0); |
| 1831 | set_gdbarch_deprecated_pc_in_call_dummy (gdbarch, deprecated_pc_in_call_dummy_at_entry_point); |
| 1832 | set_gdbarch_push_dummy_frame (gdbarch, generic_push_dummy_frame); |
| 1833 | set_gdbarch_push_arguments (gdbarch, s390_push_arguments); |
| 1834 | set_gdbarch_save_dummy_frame_tos (gdbarch, generic_save_dummy_frame_tos); |
| 1835 | set_gdbarch_call_dummy_breakpoint_offset_p (gdbarch, 1); |
| 1836 | set_gdbarch_call_dummy_breakpoint_offset (gdbarch, 0); |
| 1837 | set_gdbarch_call_dummy_stack_adjust_p (gdbarch, 0); |
| 1838 | set_gdbarch_fix_call_dummy (gdbarch, generic_fix_call_dummy); |
| 1839 | set_gdbarch_push_return_address (gdbarch, s390_push_return_address); |
| 1840 | set_gdbarch_sizeof_call_dummy_words (gdbarch, |
| 1841 | sizeof (s390_call_dummy_words)); |
| 1842 | set_gdbarch_call_dummy_words (gdbarch, s390_call_dummy_words); |
| 1843 | set_gdbarch_coerce_float_to_double (gdbarch, |
| 1844 | standard_coerce_float_to_double); |
| 1845 | |
| 1846 | switch (info.bfd_arch_info->mach) |
| 1847 | { |
| 1848 | case bfd_mach_s390_31: |
| 1849 | set_gdbarch_register_size (gdbarch, 4); |
| 1850 | set_gdbarch_register_raw_size (gdbarch, s390_register_raw_size); |
| 1851 | set_gdbarch_register_virtual_size (gdbarch, s390_register_raw_size); |
| 1852 | set_gdbarch_register_virtual_type (gdbarch, s390_register_virtual_type); |
| 1853 | |
| 1854 | set_gdbarch_addr_bits_remove (gdbarch, s390_addr_bits_remove); |
| 1855 | set_gdbarch_register_bytes (gdbarch, S390_REGISTER_BYTES); |
| 1856 | break; |
| 1857 | case bfd_mach_s390_64: |
| 1858 | set_gdbarch_register_size (gdbarch, 8); |
| 1859 | set_gdbarch_register_raw_size (gdbarch, s390x_register_raw_size); |
| 1860 | set_gdbarch_register_virtual_size (gdbarch, s390x_register_raw_size); |
| 1861 | set_gdbarch_register_virtual_type (gdbarch, |
| 1862 | s390x_register_virtual_type); |
| 1863 | |
| 1864 | set_gdbarch_long_bit (gdbarch, 64); |
| 1865 | set_gdbarch_long_long_bit (gdbarch, 64); |
| 1866 | set_gdbarch_ptr_bit (gdbarch, 64); |
| 1867 | set_gdbarch_register_bytes (gdbarch, S390X_REGISTER_BYTES); |
| 1868 | break; |
| 1869 | } |
| 1870 | |
| 1871 | return gdbarch; |
| 1872 | } |
| 1873 | |
| 1874 | |
| 1875 | |
| 1876 | void |
| 1877 | _initialize_s390_tdep (void) |
| 1878 | { |
| 1879 | |
| 1880 | /* Hook us into the gdbarch mechanism. */ |
| 1881 | register_gdbarch_init (bfd_arch_s390, s390_gdbarch_init); |
| 1882 | if (!tm_print_insn) /* Someone may have already set it */ |
| 1883 | tm_print_insn = gdb_print_insn_s390; |
| 1884 | } |
| 1885 | |
| 1886 | #endif /* GDBSERVER */ |