Commit | Line | Data |
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c906108c | 1 | /* Target-dependent code for the ALPHA architecture, for GDB, the GNU Debugger. |
0fd88904 | 2 | |
6aba47ca DJ |
3 | Copyright (C) 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, |
4 | 2003, 2005, 2006, 2007 Free Software Foundation, Inc. | |
c906108c | 5 | |
c5aa993b | 6 | This file is part of GDB. |
c906108c | 7 | |
c5aa993b JM |
8 | This program is free software; you can redistribute it and/or modify |
9 | it under the terms of the GNU General Public License as published by | |
a9762ec7 | 10 | the Free Software Foundation; either version 3 of the License, or |
c5aa993b | 11 | (at your option) any later version. |
c906108c | 12 | |
c5aa993b JM |
13 | This program is distributed in the hope that it will be useful, |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
c906108c | 17 | |
c5aa993b | 18 | You should have received a copy of the GNU General Public License |
a9762ec7 | 19 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
c906108c SS |
20 | |
21 | #include "defs.h" | |
615967cb | 22 | #include "doublest.h" |
c906108c | 23 | #include "frame.h" |
d2427a71 RH |
24 | #include "frame-unwind.h" |
25 | #include "frame-base.h" | |
baa490c4 | 26 | #include "dwarf2-frame.h" |
c906108c SS |
27 | #include "inferior.h" |
28 | #include "symtab.h" | |
29 | #include "value.h" | |
30 | #include "gdbcmd.h" | |
31 | #include "gdbcore.h" | |
32 | #include "dis-asm.h" | |
33 | #include "symfile.h" | |
34 | #include "objfiles.h" | |
35 | #include "gdb_string.h" | |
c5f0f3d0 | 36 | #include "linespec.h" |
4e052eda | 37 | #include "regcache.h" |
615967cb | 38 | #include "reggroups.h" |
dc129d82 | 39 | #include "arch-utils.h" |
4be87837 | 40 | #include "osabi.h" |
fe898f56 | 41 | #include "block.h" |
7d9b040b | 42 | #include "infcall.h" |
dc129d82 JT |
43 | |
44 | #include "elf-bfd.h" | |
45 | ||
46 | #include "alpha-tdep.h" | |
47 | ||
c906108c | 48 | \f |
515921d7 JB |
49 | /* Return the name of the REGNO register. |
50 | ||
51 | An empty name corresponds to a register number that used to | |
52 | be used for a virtual register. That virtual register has | |
53 | been removed, but the index is still reserved to maintain | |
54 | compatibility with existing remote alpha targets. */ | |
55 | ||
fa88f677 | 56 | static const char * |
636a6dfc JT |
57 | alpha_register_name (int regno) |
58 | { | |
5ab84872 | 59 | static const char * const register_names[] = |
636a6dfc JT |
60 | { |
61 | "v0", "t0", "t1", "t2", "t3", "t4", "t5", "t6", | |
62 | "t7", "s0", "s1", "s2", "s3", "s4", "s5", "fp", | |
63 | "a0", "a1", "a2", "a3", "a4", "a5", "t8", "t9", | |
64 | "t10", "t11", "ra", "t12", "at", "gp", "sp", "zero", | |
65 | "f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7", | |
66 | "f8", "f9", "f10", "f11", "f12", "f13", "f14", "f15", | |
67 | "f16", "f17", "f18", "f19", "f20", "f21", "f22", "f23", | |
68 | "f24", "f25", "f26", "f27", "f28", "f29", "f30", "fpcr", | |
44d88583 | 69 | "pc", "", "unique" |
636a6dfc JT |
70 | }; |
71 | ||
72 | if (regno < 0) | |
5ab84872 | 73 | return NULL; |
e8d2d628 | 74 | if (regno >= ARRAY_SIZE(register_names)) |
5ab84872 RH |
75 | return NULL; |
76 | return register_names[regno]; | |
636a6dfc | 77 | } |
d734c450 | 78 | |
dc129d82 | 79 | static int |
d734c450 JT |
80 | alpha_cannot_fetch_register (int regno) |
81 | { | |
515921d7 JB |
82 | return (regno == ALPHA_ZERO_REGNUM |
83 | || strlen (alpha_register_name (regno)) == 0); | |
d734c450 JT |
84 | } |
85 | ||
dc129d82 | 86 | static int |
d734c450 JT |
87 | alpha_cannot_store_register (int regno) |
88 | { | |
515921d7 JB |
89 | return (regno == ALPHA_ZERO_REGNUM |
90 | || strlen (alpha_register_name (regno)) == 0); | |
d734c450 JT |
91 | } |
92 | ||
dc129d82 | 93 | static struct type * |
c483c494 | 94 | alpha_register_type (struct gdbarch *gdbarch, int regno) |
0d056799 | 95 | { |
72667056 RH |
96 | if (regno == ALPHA_SP_REGNUM || regno == ALPHA_GP_REGNUM) |
97 | return builtin_type_void_data_ptr; | |
98 | if (regno == ALPHA_PC_REGNUM) | |
99 | return builtin_type_void_func_ptr; | |
100 | ||
101 | /* Don't need to worry about little vs big endian until | |
102 | some jerk tries to port to alpha-unicosmk. */ | |
b38b6be2 | 103 | if (regno >= ALPHA_FP0_REGNUM && regno < ALPHA_FP0_REGNUM + 31) |
8da61cc4 | 104 | return builtin_type_ieee_double; |
72667056 RH |
105 | |
106 | return builtin_type_int64; | |
0d056799 | 107 | } |
f8453e34 | 108 | |
615967cb RH |
109 | /* Is REGNUM a member of REGGROUP? */ |
110 | ||
111 | static int | |
112 | alpha_register_reggroup_p (struct gdbarch *gdbarch, int regnum, | |
113 | struct reggroup *group) | |
114 | { | |
115 | /* Filter out any registers eliminated, but whose regnum is | |
116 | reserved for backward compatibility, e.g. the vfp. */ | |
c9f4d572 UW |
117 | if (gdbarch_register_name (current_gdbarch, regnum) == NULL |
118 | || *gdbarch_register_name (current_gdbarch, regnum) == '\0') | |
615967cb RH |
119 | return 0; |
120 | ||
df4a182b RH |
121 | if (group == all_reggroup) |
122 | return 1; | |
123 | ||
124 | /* Zero should not be saved or restored. Technically it is a general | |
125 | register (just as $f31 would be a float if we represented it), but | |
126 | there's no point displaying it during "info regs", so leave it out | |
127 | of all groups except for "all". */ | |
128 | if (regnum == ALPHA_ZERO_REGNUM) | |
129 | return 0; | |
130 | ||
131 | /* All other registers are saved and restored. */ | |
132 | if (group == save_reggroup || group == restore_reggroup) | |
615967cb RH |
133 | return 1; |
134 | ||
135 | /* All other groups are non-overlapping. */ | |
136 | ||
137 | /* Since this is really a PALcode memory slot... */ | |
138 | if (regnum == ALPHA_UNIQUE_REGNUM) | |
139 | return group == system_reggroup; | |
140 | ||
141 | /* Force the FPCR to be considered part of the floating point state. */ | |
142 | if (regnum == ALPHA_FPCR_REGNUM) | |
143 | return group == float_reggroup; | |
144 | ||
145 | if (regnum >= ALPHA_FP0_REGNUM && regnum < ALPHA_FP0_REGNUM + 31) | |
146 | return group == float_reggroup; | |
147 | else | |
148 | return group == general_reggroup; | |
149 | } | |
150 | ||
c483c494 RH |
151 | /* The following represents exactly the conversion performed by |
152 | the LDS instruction. This applies to both single-precision | |
153 | floating point and 32-bit integers. */ | |
154 | ||
155 | static void | |
156 | alpha_lds (void *out, const void *in) | |
157 | { | |
158 | ULONGEST mem = extract_unsigned_integer (in, 4); | |
159 | ULONGEST frac = (mem >> 0) & 0x7fffff; | |
160 | ULONGEST sign = (mem >> 31) & 1; | |
161 | ULONGEST exp_msb = (mem >> 30) & 1; | |
162 | ULONGEST exp_low = (mem >> 23) & 0x7f; | |
163 | ULONGEST exp, reg; | |
164 | ||
165 | exp = (exp_msb << 10) | exp_low; | |
166 | if (exp_msb) | |
167 | { | |
168 | if (exp_low == 0x7f) | |
169 | exp = 0x7ff; | |
170 | } | |
171 | else | |
172 | { | |
173 | if (exp_low != 0x00) | |
174 | exp |= 0x380; | |
175 | } | |
176 | ||
177 | reg = (sign << 63) | (exp << 52) | (frac << 29); | |
178 | store_unsigned_integer (out, 8, reg); | |
179 | } | |
180 | ||
181 | /* Similarly, this represents exactly the conversion performed by | |
182 | the STS instruction. */ | |
183 | ||
39efb398 | 184 | static void |
c483c494 RH |
185 | alpha_sts (void *out, const void *in) |
186 | { | |
187 | ULONGEST reg, mem; | |
188 | ||
189 | reg = extract_unsigned_integer (in, 8); | |
190 | mem = ((reg >> 32) & 0xc0000000) | ((reg >> 29) & 0x3fffffff); | |
191 | store_unsigned_integer (out, 4, mem); | |
192 | } | |
193 | ||
d2427a71 RH |
194 | /* The alpha needs a conversion between register and memory format if the |
195 | register is a floating point register and memory format is float, as the | |
196 | register format must be double or memory format is an integer with 4 | |
197 | bytes or less, as the representation of integers in floating point | |
198 | registers is different. */ | |
199 | ||
c483c494 | 200 | static int |
ff2e87ac | 201 | alpha_convert_register_p (int regno, struct type *type) |
14696584 | 202 | { |
c483c494 | 203 | return (regno >= ALPHA_FP0_REGNUM && regno < ALPHA_FP0_REGNUM + 31); |
14696584 RH |
204 | } |
205 | ||
d2427a71 | 206 | static void |
ff2e87ac | 207 | alpha_register_to_value (struct frame_info *frame, int regnum, |
5b819568 | 208 | struct type *valtype, gdb_byte *out) |
5868c862 | 209 | { |
2a1ce6ec MK |
210 | gdb_byte in[MAX_REGISTER_SIZE]; |
211 | ||
ff2e87ac | 212 | frame_register_read (frame, regnum, in); |
c483c494 | 213 | switch (TYPE_LENGTH (valtype)) |
d2427a71 | 214 | { |
c483c494 RH |
215 | case 4: |
216 | alpha_sts (out, in); | |
217 | break; | |
218 | case 8: | |
219 | memcpy (out, in, 8); | |
220 | break; | |
221 | default: | |
323e0a4a | 222 | error (_("Cannot retrieve value from floating point register")); |
d2427a71 | 223 | } |
d2427a71 | 224 | } |
5868c862 | 225 | |
d2427a71 | 226 | static void |
ff2e87ac | 227 | alpha_value_to_register (struct frame_info *frame, int regnum, |
5b819568 | 228 | struct type *valtype, const gdb_byte *in) |
d2427a71 | 229 | { |
2a1ce6ec MK |
230 | gdb_byte out[MAX_REGISTER_SIZE]; |
231 | ||
c483c494 | 232 | switch (TYPE_LENGTH (valtype)) |
d2427a71 | 233 | { |
c483c494 RH |
234 | case 4: |
235 | alpha_lds (out, in); | |
236 | break; | |
237 | case 8: | |
238 | memcpy (out, in, 8); | |
239 | break; | |
240 | default: | |
323e0a4a | 241 | error (_("Cannot store value in floating point register")); |
d2427a71 | 242 | } |
ff2e87ac | 243 | put_frame_register (frame, regnum, out); |
5868c862 JT |
244 | } |
245 | ||
d2427a71 RH |
246 | \f |
247 | /* The alpha passes the first six arguments in the registers, the rest on | |
c88e30c0 RH |
248 | the stack. The register arguments are stored in ARG_REG_BUFFER, and |
249 | then moved into the register file; this simplifies the passing of a | |
250 | large struct which extends from the registers to the stack, plus avoids | |
251 | three ptrace invocations per word. | |
252 | ||
253 | We don't bother tracking which register values should go in integer | |
254 | regs or fp regs; we load the same values into both. | |
255 | ||
d2427a71 RH |
256 | If the called function is returning a structure, the address of the |
257 | structure to be returned is passed as a hidden first argument. */ | |
c906108c | 258 | |
d2427a71 | 259 | static CORE_ADDR |
7d9b040b | 260 | alpha_push_dummy_call (struct gdbarch *gdbarch, struct value *function, |
c88e30c0 RH |
261 | struct regcache *regcache, CORE_ADDR bp_addr, |
262 | int nargs, struct value **args, CORE_ADDR sp, | |
263 | int struct_return, CORE_ADDR struct_addr) | |
c906108c | 264 | { |
d2427a71 RH |
265 | int i; |
266 | int accumulate_size = struct_return ? 8 : 0; | |
d2427a71 | 267 | struct alpha_arg |
c906108c | 268 | { |
2a1ce6ec | 269 | gdb_byte *contents; |
d2427a71 RH |
270 | int len; |
271 | int offset; | |
272 | }; | |
c88e30c0 RH |
273 | struct alpha_arg *alpha_args |
274 | = (struct alpha_arg *) alloca (nargs * sizeof (struct alpha_arg)); | |
52f0bd74 | 275 | struct alpha_arg *m_arg; |
2a1ce6ec | 276 | gdb_byte arg_reg_buffer[ALPHA_REGISTER_SIZE * ALPHA_NUM_ARG_REGS]; |
d2427a71 | 277 | int required_arg_regs; |
7d9b040b | 278 | CORE_ADDR func_addr = find_function_addr (function, NULL); |
c906108c | 279 | |
c88e30c0 RH |
280 | /* The ABI places the address of the called function in T12. */ |
281 | regcache_cooked_write_signed (regcache, ALPHA_T12_REGNUM, func_addr); | |
282 | ||
283 | /* Set the return address register to point to the entry point | |
284 | of the program, where a breakpoint lies in wait. */ | |
285 | regcache_cooked_write_signed (regcache, ALPHA_RA_REGNUM, bp_addr); | |
286 | ||
287 | /* Lay out the arguments in memory. */ | |
d2427a71 RH |
288 | for (i = 0, m_arg = alpha_args; i < nargs; i++, m_arg++) |
289 | { | |
290 | struct value *arg = args[i]; | |
4991999e | 291 | struct type *arg_type = check_typedef (value_type (arg)); |
c88e30c0 | 292 | |
d2427a71 RH |
293 | /* Cast argument to long if necessary as the compiler does it too. */ |
294 | switch (TYPE_CODE (arg_type)) | |
c906108c | 295 | { |
d2427a71 RH |
296 | case TYPE_CODE_INT: |
297 | case TYPE_CODE_BOOL: | |
298 | case TYPE_CODE_CHAR: | |
299 | case TYPE_CODE_RANGE: | |
300 | case TYPE_CODE_ENUM: | |
0ede8eca | 301 | if (TYPE_LENGTH (arg_type) == 4) |
d2427a71 | 302 | { |
0ede8eca RH |
303 | /* 32-bit values must be sign-extended to 64 bits |
304 | even if the base data type is unsigned. */ | |
305 | arg_type = builtin_type_int32; | |
306 | arg = value_cast (arg_type, arg); | |
307 | } | |
308 | if (TYPE_LENGTH (arg_type) < ALPHA_REGISTER_SIZE) | |
309 | { | |
310 | arg_type = builtin_type_int64; | |
d2427a71 RH |
311 | arg = value_cast (arg_type, arg); |
312 | } | |
313 | break; | |
7b5e1cb3 | 314 | |
c88e30c0 RH |
315 | case TYPE_CODE_FLT: |
316 | /* "float" arguments loaded in registers must be passed in | |
317 | register format, aka "double". */ | |
318 | if (accumulate_size < sizeof (arg_reg_buffer) | |
319 | && TYPE_LENGTH (arg_type) == 4) | |
320 | { | |
8da61cc4 | 321 | arg_type = builtin_type_ieee_double; |
c88e30c0 RH |
322 | arg = value_cast (arg_type, arg); |
323 | } | |
324 | /* Tru64 5.1 has a 128-bit long double, and passes this by | |
325 | invisible reference. No one else uses this data type. */ | |
326 | else if (TYPE_LENGTH (arg_type) == 16) | |
327 | { | |
328 | /* Allocate aligned storage. */ | |
329 | sp = (sp & -16) - 16; | |
330 | ||
331 | /* Write the real data into the stack. */ | |
0fd88904 | 332 | write_memory (sp, value_contents (arg), 16); |
c88e30c0 RH |
333 | |
334 | /* Construct the indirection. */ | |
335 | arg_type = lookup_pointer_type (arg_type); | |
336 | arg = value_from_pointer (arg_type, sp); | |
337 | } | |
338 | break; | |
7b5e1cb3 RH |
339 | |
340 | case TYPE_CODE_COMPLEX: | |
341 | /* ??? The ABI says that complex values are passed as two | |
342 | separate scalar values. This distinction only matters | |
343 | for complex float. However, GCC does not implement this. */ | |
344 | ||
345 | /* Tru64 5.1 has a 128-bit long double, and passes this by | |
346 | invisible reference. */ | |
347 | if (TYPE_LENGTH (arg_type) == 32) | |
348 | { | |
349 | /* Allocate aligned storage. */ | |
350 | sp = (sp & -16) - 16; | |
351 | ||
352 | /* Write the real data into the stack. */ | |
0fd88904 | 353 | write_memory (sp, value_contents (arg), 32); |
7b5e1cb3 RH |
354 | |
355 | /* Construct the indirection. */ | |
356 | arg_type = lookup_pointer_type (arg_type); | |
357 | arg = value_from_pointer (arg_type, sp); | |
358 | } | |
359 | break; | |
360 | ||
d2427a71 RH |
361 | default: |
362 | break; | |
c906108c | 363 | } |
d2427a71 RH |
364 | m_arg->len = TYPE_LENGTH (arg_type); |
365 | m_arg->offset = accumulate_size; | |
366 | accumulate_size = (accumulate_size + m_arg->len + 7) & ~7; | |
0fd88904 | 367 | m_arg->contents = value_contents_writeable (arg); |
c906108c SS |
368 | } |
369 | ||
d2427a71 RH |
370 | /* Determine required argument register loads, loading an argument register |
371 | is expensive as it uses three ptrace calls. */ | |
372 | required_arg_regs = accumulate_size / 8; | |
373 | if (required_arg_regs > ALPHA_NUM_ARG_REGS) | |
374 | required_arg_regs = ALPHA_NUM_ARG_REGS; | |
c906108c | 375 | |
d2427a71 | 376 | /* Make room for the arguments on the stack. */ |
c88e30c0 RH |
377 | if (accumulate_size < sizeof(arg_reg_buffer)) |
378 | accumulate_size = 0; | |
379 | else | |
380 | accumulate_size -= sizeof(arg_reg_buffer); | |
d2427a71 | 381 | sp -= accumulate_size; |
c906108c | 382 | |
c88e30c0 | 383 | /* Keep sp aligned to a multiple of 16 as the ABI requires. */ |
d2427a71 | 384 | sp &= ~15; |
c906108c | 385 | |
d2427a71 RH |
386 | /* `Push' arguments on the stack. */ |
387 | for (i = nargs; m_arg--, --i >= 0;) | |
c906108c | 388 | { |
2a1ce6ec | 389 | gdb_byte *contents = m_arg->contents; |
c88e30c0 RH |
390 | int offset = m_arg->offset; |
391 | int len = m_arg->len; | |
392 | ||
393 | /* Copy the bytes destined for registers into arg_reg_buffer. */ | |
394 | if (offset < sizeof(arg_reg_buffer)) | |
395 | { | |
396 | if (offset + len <= sizeof(arg_reg_buffer)) | |
397 | { | |
398 | memcpy (arg_reg_buffer + offset, contents, len); | |
399 | continue; | |
400 | } | |
401 | else | |
402 | { | |
403 | int tlen = sizeof(arg_reg_buffer) - offset; | |
404 | memcpy (arg_reg_buffer + offset, contents, tlen); | |
405 | offset += tlen; | |
406 | contents += tlen; | |
407 | len -= tlen; | |
408 | } | |
409 | } | |
410 | ||
411 | /* Everything else goes to the stack. */ | |
412 | write_memory (sp + offset - sizeof(arg_reg_buffer), contents, len); | |
c906108c | 413 | } |
c88e30c0 RH |
414 | if (struct_return) |
415 | store_unsigned_integer (arg_reg_buffer, ALPHA_REGISTER_SIZE, struct_addr); | |
c906108c | 416 | |
d2427a71 RH |
417 | /* Load the argument registers. */ |
418 | for (i = 0; i < required_arg_regs; i++) | |
419 | { | |
09cc52fd RH |
420 | regcache_cooked_write (regcache, ALPHA_A0_REGNUM + i, |
421 | arg_reg_buffer + i*ALPHA_REGISTER_SIZE); | |
422 | regcache_cooked_write (regcache, ALPHA_FPA0_REGNUM + i, | |
423 | arg_reg_buffer + i*ALPHA_REGISTER_SIZE); | |
d2427a71 | 424 | } |
c906108c | 425 | |
09cc52fd RH |
426 | /* Finally, update the stack pointer. */ |
427 | regcache_cooked_write_signed (regcache, ALPHA_SP_REGNUM, sp); | |
428 | ||
c88e30c0 | 429 | return sp; |
c906108c SS |
430 | } |
431 | ||
5ec2bb99 RH |
432 | /* Extract from REGCACHE the value about to be returned from a function |
433 | and copy it into VALBUF. */ | |
d2427a71 | 434 | |
dc129d82 | 435 | static void |
5ec2bb99 | 436 | alpha_extract_return_value (struct type *valtype, struct regcache *regcache, |
5b819568 | 437 | gdb_byte *valbuf) |
140f9984 | 438 | { |
7b5e1cb3 | 439 | int length = TYPE_LENGTH (valtype); |
2a1ce6ec | 440 | gdb_byte raw_buffer[ALPHA_REGISTER_SIZE]; |
5ec2bb99 RH |
441 | ULONGEST l; |
442 | ||
443 | switch (TYPE_CODE (valtype)) | |
444 | { | |
445 | case TYPE_CODE_FLT: | |
7b5e1cb3 | 446 | switch (length) |
5ec2bb99 RH |
447 | { |
448 | case 4: | |
449 | regcache_cooked_read (regcache, ALPHA_FP0_REGNUM, raw_buffer); | |
c483c494 | 450 | alpha_sts (valbuf, raw_buffer); |
5ec2bb99 RH |
451 | break; |
452 | ||
453 | case 8: | |
454 | regcache_cooked_read (regcache, ALPHA_FP0_REGNUM, valbuf); | |
455 | break; | |
456 | ||
24064b5c RH |
457 | case 16: |
458 | regcache_cooked_read_unsigned (regcache, ALPHA_V0_REGNUM, &l); | |
459 | read_memory (l, valbuf, 16); | |
460 | break; | |
461 | ||
5ec2bb99 | 462 | default: |
323e0a4a | 463 | internal_error (__FILE__, __LINE__, _("unknown floating point width")); |
5ec2bb99 RH |
464 | } |
465 | break; | |
466 | ||
7b5e1cb3 RH |
467 | case TYPE_CODE_COMPLEX: |
468 | switch (length) | |
469 | { | |
470 | case 8: | |
471 | /* ??? This isn't correct wrt the ABI, but it's what GCC does. */ | |
472 | regcache_cooked_read (regcache, ALPHA_FP0_REGNUM, valbuf); | |
473 | break; | |
474 | ||
475 | case 16: | |
476 | regcache_cooked_read (regcache, ALPHA_FP0_REGNUM, valbuf); | |
2a1ce6ec | 477 | regcache_cooked_read (regcache, ALPHA_FP0_REGNUM + 1, valbuf + 8); |
7b5e1cb3 RH |
478 | break; |
479 | ||
480 | case 32: | |
481 | regcache_cooked_read_signed (regcache, ALPHA_V0_REGNUM, &l); | |
482 | read_memory (l, valbuf, 32); | |
483 | break; | |
484 | ||
485 | default: | |
323e0a4a | 486 | internal_error (__FILE__, __LINE__, _("unknown floating point width")); |
7b5e1cb3 RH |
487 | } |
488 | break; | |
489 | ||
5ec2bb99 RH |
490 | default: |
491 | /* Assume everything else degenerates to an integer. */ | |
492 | regcache_cooked_read_unsigned (regcache, ALPHA_V0_REGNUM, &l); | |
7b5e1cb3 | 493 | store_unsigned_integer (valbuf, length, l); |
5ec2bb99 RH |
494 | break; |
495 | } | |
140f9984 JT |
496 | } |
497 | ||
5ec2bb99 RH |
498 | /* Insert the given value into REGCACHE as if it was being |
499 | returned by a function. */ | |
0d056799 | 500 | |
d2427a71 | 501 | static void |
5ec2bb99 | 502 | alpha_store_return_value (struct type *valtype, struct regcache *regcache, |
5b819568 | 503 | const gdb_byte *valbuf) |
c906108c | 504 | { |
d2427a71 | 505 | int length = TYPE_LENGTH (valtype); |
2a1ce6ec | 506 | gdb_byte raw_buffer[ALPHA_REGISTER_SIZE]; |
5ec2bb99 | 507 | ULONGEST l; |
d2427a71 | 508 | |
5ec2bb99 | 509 | switch (TYPE_CODE (valtype)) |
c906108c | 510 | { |
5ec2bb99 RH |
511 | case TYPE_CODE_FLT: |
512 | switch (length) | |
513 | { | |
514 | case 4: | |
c483c494 | 515 | alpha_lds (raw_buffer, valbuf); |
f75d70cc RH |
516 | regcache_cooked_write (regcache, ALPHA_FP0_REGNUM, raw_buffer); |
517 | break; | |
5ec2bb99 RH |
518 | |
519 | case 8: | |
520 | regcache_cooked_write (regcache, ALPHA_FP0_REGNUM, valbuf); | |
521 | break; | |
522 | ||
24064b5c RH |
523 | case 16: |
524 | /* FIXME: 128-bit long doubles are returned like structures: | |
525 | by writing into indirect storage provided by the caller | |
526 | as the first argument. */ | |
323e0a4a | 527 | error (_("Cannot set a 128-bit long double return value.")); |
24064b5c | 528 | |
5ec2bb99 | 529 | default: |
323e0a4a | 530 | internal_error (__FILE__, __LINE__, _("unknown floating point width")); |
5ec2bb99 RH |
531 | } |
532 | break; | |
d2427a71 | 533 | |
7b5e1cb3 RH |
534 | case TYPE_CODE_COMPLEX: |
535 | switch (length) | |
536 | { | |
537 | case 8: | |
538 | /* ??? This isn't correct wrt the ABI, but it's what GCC does. */ | |
539 | regcache_cooked_write (regcache, ALPHA_FP0_REGNUM, valbuf); | |
540 | break; | |
541 | ||
542 | case 16: | |
543 | regcache_cooked_write (regcache, ALPHA_FP0_REGNUM, valbuf); | |
2a1ce6ec | 544 | regcache_cooked_write (regcache, ALPHA_FP0_REGNUM + 1, valbuf + 8); |
7b5e1cb3 RH |
545 | break; |
546 | ||
547 | case 32: | |
548 | /* FIXME: 128-bit long doubles are returned like structures: | |
549 | by writing into indirect storage provided by the caller | |
550 | as the first argument. */ | |
323e0a4a | 551 | error (_("Cannot set a 128-bit long double return value.")); |
7b5e1cb3 RH |
552 | |
553 | default: | |
323e0a4a | 554 | internal_error (__FILE__, __LINE__, _("unknown floating point width")); |
7b5e1cb3 RH |
555 | } |
556 | break; | |
557 | ||
5ec2bb99 RH |
558 | default: |
559 | /* Assume everything else degenerates to an integer. */ | |
0ede8eca RH |
560 | /* 32-bit values must be sign-extended to 64 bits |
561 | even if the base data type is unsigned. */ | |
562 | if (length == 4) | |
563 | valtype = builtin_type_int32; | |
5ec2bb99 RH |
564 | l = unpack_long (valtype, valbuf); |
565 | regcache_cooked_write_unsigned (regcache, ALPHA_V0_REGNUM, l); | |
566 | break; | |
567 | } | |
c906108c SS |
568 | } |
569 | ||
9823e921 RH |
570 | static enum return_value_convention |
571 | alpha_return_value (struct gdbarch *gdbarch, struct type *type, | |
572 | struct regcache *regcache, gdb_byte *readbuf, | |
573 | const gdb_byte *writebuf) | |
574 | { | |
575 | enum type_code code = TYPE_CODE (type); | |
576 | ||
577 | if ((code == TYPE_CODE_STRUCT | |
578 | || code == TYPE_CODE_UNION | |
579 | || code == TYPE_CODE_ARRAY) | |
580 | && gdbarch_tdep (gdbarch)->return_in_memory (type)) | |
581 | { | |
582 | if (readbuf) | |
583 | { | |
584 | ULONGEST addr; | |
585 | regcache_raw_read_unsigned (regcache, ALPHA_V0_REGNUM, &addr); | |
586 | read_memory (addr, readbuf, TYPE_LENGTH (type)); | |
587 | } | |
588 | ||
589 | return RETURN_VALUE_ABI_RETURNS_ADDRESS; | |
590 | } | |
591 | ||
592 | if (readbuf) | |
593 | alpha_extract_return_value (type, regcache, readbuf); | |
594 | if (writebuf) | |
595 | alpha_store_return_value (type, regcache, writebuf); | |
596 | ||
597 | return RETURN_VALUE_REGISTER_CONVENTION; | |
598 | } | |
599 | ||
600 | static int | |
601 | alpha_return_in_memory_always (struct type *type) | |
602 | { | |
603 | return 1; | |
604 | } | |
d2427a71 | 605 | \f |
2a1ce6ec MK |
606 | static const gdb_byte * |
607 | alpha_breakpoint_from_pc (CORE_ADDR *pc, int *len) | |
c906108c | 608 | { |
2a1ce6ec | 609 | static const gdb_byte break_insn[] = { 0x80, 0, 0, 0 }; /* call_pal bpt */ |
c906108c | 610 | |
2a1ce6ec MK |
611 | *len = sizeof(break_insn); |
612 | return break_insn; | |
d2427a71 | 613 | } |
c906108c | 614 | |
d2427a71 RH |
615 | \f |
616 | /* This returns the PC of the first insn after the prologue. | |
617 | If we can't find the prologue, then return 0. */ | |
c906108c | 618 | |
d2427a71 RH |
619 | CORE_ADDR |
620 | alpha_after_prologue (CORE_ADDR pc) | |
c906108c | 621 | { |
d2427a71 RH |
622 | struct symtab_and_line sal; |
623 | CORE_ADDR func_addr, func_end; | |
c906108c | 624 | |
d2427a71 | 625 | if (!find_pc_partial_function (pc, NULL, &func_addr, &func_end)) |
c5aa993b | 626 | return 0; |
c906108c | 627 | |
d2427a71 RH |
628 | sal = find_pc_line (func_addr, 0); |
629 | if (sal.end < func_end) | |
630 | return sal.end; | |
c5aa993b | 631 | |
d2427a71 RH |
632 | /* The line after the prologue is after the end of the function. In this |
633 | case, tell the caller to find the prologue the hard way. */ | |
634 | return 0; | |
c906108c SS |
635 | } |
636 | ||
d2427a71 RH |
637 | /* Read an instruction from memory at PC, looking through breakpoints. */ |
638 | ||
639 | unsigned int | |
640 | alpha_read_insn (CORE_ADDR pc) | |
c906108c | 641 | { |
e8d2d628 | 642 | gdb_byte buf[ALPHA_INSN_SIZE]; |
d2427a71 | 643 | int status; |
c5aa993b | 644 | |
e8d2d628 | 645 | status = read_memory_nobpt (pc, buf, sizeof (buf)); |
d2427a71 RH |
646 | if (status) |
647 | memory_error (status, pc); | |
e8d2d628 | 648 | return extract_unsigned_integer (buf, sizeof (buf)); |
d2427a71 | 649 | } |
c5aa993b | 650 | |
d2427a71 RH |
651 | /* To skip prologues, I use this predicate. Returns either PC itself |
652 | if the code at PC does not look like a function prologue; otherwise | |
653 | returns an address that (if we're lucky) follows the prologue. If | |
654 | LENIENT, then we must skip everything which is involved in setting | |
655 | up the frame (it's OK to skip more, just so long as we don't skip | |
656 | anything which might clobber the registers which are being saved. */ | |
c906108c | 657 | |
d2427a71 RH |
658 | static CORE_ADDR |
659 | alpha_skip_prologue (CORE_ADDR pc) | |
660 | { | |
661 | unsigned long inst; | |
662 | int offset; | |
663 | CORE_ADDR post_prologue_pc; | |
e8d2d628 | 664 | gdb_byte buf[ALPHA_INSN_SIZE]; |
c906108c | 665 | |
d2427a71 RH |
666 | /* Silently return the unaltered pc upon memory errors. |
667 | This could happen on OSF/1 if decode_line_1 tries to skip the | |
668 | prologue for quickstarted shared library functions when the | |
669 | shared library is not yet mapped in. | |
670 | Reading target memory is slow over serial lines, so we perform | |
671 | this check only if the target has shared libraries (which all | |
672 | Alpha targets do). */ | |
e8d2d628 | 673 | if (target_read_memory (pc, buf, sizeof (buf))) |
d2427a71 | 674 | return pc; |
c906108c | 675 | |
d2427a71 RH |
676 | /* See if we can determine the end of the prologue via the symbol table. |
677 | If so, then return either PC, or the PC after the prologue, whichever | |
678 | is greater. */ | |
c906108c | 679 | |
d2427a71 RH |
680 | post_prologue_pc = alpha_after_prologue (pc); |
681 | if (post_prologue_pc != 0) | |
682 | return max (pc, post_prologue_pc); | |
c906108c | 683 | |
d2427a71 RH |
684 | /* Can't determine prologue from the symbol table, need to examine |
685 | instructions. */ | |
dc1b0db2 | 686 | |
d2427a71 RH |
687 | /* Skip the typical prologue instructions. These are the stack adjustment |
688 | instruction and the instructions that save registers on the stack | |
689 | or in the gcc frame. */ | |
e8d2d628 | 690 | for (offset = 0; offset < 100; offset += ALPHA_INSN_SIZE) |
d2427a71 RH |
691 | { |
692 | inst = alpha_read_insn (pc + offset); | |
c906108c | 693 | |
d2427a71 RH |
694 | if ((inst & 0xffff0000) == 0x27bb0000) /* ldah $gp,n($t12) */ |
695 | continue; | |
696 | if ((inst & 0xffff0000) == 0x23bd0000) /* lda $gp,n($gp) */ | |
697 | continue; | |
698 | if ((inst & 0xffff0000) == 0x23de0000) /* lda $sp,n($sp) */ | |
699 | continue; | |
700 | if ((inst & 0xffe01fff) == 0x43c0153e) /* subq $sp,n,$sp */ | |
701 | continue; | |
c906108c | 702 | |
d2427a71 RH |
703 | if (((inst & 0xfc1f0000) == 0xb41e0000 /* stq reg,n($sp) */ |
704 | || (inst & 0xfc1f0000) == 0x9c1e0000) /* stt reg,n($sp) */ | |
705 | && (inst & 0x03e00000) != 0x03e00000) /* reg != $zero */ | |
706 | continue; | |
c906108c | 707 | |
d2427a71 RH |
708 | if (inst == 0x47de040f) /* bis sp,sp,fp */ |
709 | continue; | |
710 | if (inst == 0x47fe040f) /* bis zero,sp,fp */ | |
711 | continue; | |
c906108c | 712 | |
d2427a71 | 713 | break; |
c906108c | 714 | } |
d2427a71 RH |
715 | return pc + offset; |
716 | } | |
c906108c | 717 | |
d2427a71 RH |
718 | \f |
719 | /* Figure out where the longjmp will land. | |
720 | We expect the first arg to be a pointer to the jmp_buf structure from | |
721 | which we extract the PC (JB_PC) that we will land at. The PC is copied | |
722 | into the "pc". This routine returns true on success. */ | |
c906108c SS |
723 | |
724 | static int | |
60ade65d | 725 | alpha_get_longjmp_target (struct frame_info *frame, CORE_ADDR *pc) |
c906108c | 726 | { |
60ade65d | 727 | struct gdbarch_tdep *tdep = gdbarch_tdep (get_frame_arch (frame)); |
d2427a71 | 728 | CORE_ADDR jb_addr; |
2a1ce6ec | 729 | gdb_byte raw_buffer[ALPHA_REGISTER_SIZE]; |
c906108c | 730 | |
60ade65d | 731 | jb_addr = get_frame_register_unsigned (frame, ALPHA_A0_REGNUM); |
c906108c | 732 | |
d2427a71 RH |
733 | if (target_read_memory (jb_addr + (tdep->jb_pc * tdep->jb_elt_size), |
734 | raw_buffer, tdep->jb_elt_size)) | |
c906108c | 735 | return 0; |
d2427a71 | 736 | |
7c0b4a20 | 737 | *pc = extract_unsigned_integer (raw_buffer, tdep->jb_elt_size); |
d2427a71 | 738 | return 1; |
c906108c SS |
739 | } |
740 | ||
d2427a71 RH |
741 | \f |
742 | /* Frame unwinder for signal trampolines. We use alpha tdep bits that | |
743 | describe the location and shape of the sigcontext structure. After | |
744 | that, all registers are in memory, so it's easy. */ | |
745 | /* ??? Shouldn't we be able to do this generically, rather than with | |
746 | OSABI data specific to Alpha? */ | |
747 | ||
748 | struct alpha_sigtramp_unwind_cache | |
c906108c | 749 | { |
d2427a71 RH |
750 | CORE_ADDR sigcontext_addr; |
751 | }; | |
c906108c | 752 | |
d2427a71 RH |
753 | static struct alpha_sigtramp_unwind_cache * |
754 | alpha_sigtramp_frame_unwind_cache (struct frame_info *next_frame, | |
755 | void **this_prologue_cache) | |
756 | { | |
757 | struct alpha_sigtramp_unwind_cache *info; | |
758 | struct gdbarch_tdep *tdep; | |
c906108c | 759 | |
d2427a71 RH |
760 | if (*this_prologue_cache) |
761 | return *this_prologue_cache; | |
c906108c | 762 | |
d2427a71 RH |
763 | info = FRAME_OBSTACK_ZALLOC (struct alpha_sigtramp_unwind_cache); |
764 | *this_prologue_cache = info; | |
c906108c | 765 | |
d2427a71 RH |
766 | tdep = gdbarch_tdep (current_gdbarch); |
767 | info->sigcontext_addr = tdep->sigcontext_addr (next_frame); | |
c906108c | 768 | |
d2427a71 | 769 | return info; |
c906108c SS |
770 | } |
771 | ||
138e7be5 MK |
772 | /* Return the address of REGNUM in a sigtramp frame. Since this is |
773 | all arithmetic, it doesn't seem worthwhile to cache it. */ | |
c5aa993b | 774 | |
d2427a71 | 775 | static CORE_ADDR |
138e7be5 | 776 | alpha_sigtramp_register_address (CORE_ADDR sigcontext_addr, int regnum) |
d2427a71 | 777 | { |
138e7be5 MK |
778 | struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); |
779 | ||
780 | if (regnum >= 0 && regnum < 32) | |
781 | return sigcontext_addr + tdep->sc_regs_offset + regnum * 8; | |
782 | else if (regnum >= ALPHA_FP0_REGNUM && regnum < ALPHA_FP0_REGNUM + 32) | |
783 | return sigcontext_addr + tdep->sc_fpregs_offset + regnum * 8; | |
784 | else if (regnum == ALPHA_PC_REGNUM) | |
785 | return sigcontext_addr + tdep->sc_pc_offset; | |
c5aa993b | 786 | |
d2427a71 | 787 | return 0; |
c906108c SS |
788 | } |
789 | ||
d2427a71 RH |
790 | /* Given a GDB frame, determine the address of the calling function's |
791 | frame. This will be used to create a new GDB frame struct. */ | |
140f9984 | 792 | |
dc129d82 | 793 | static void |
d2427a71 RH |
794 | alpha_sigtramp_frame_this_id (struct frame_info *next_frame, |
795 | void **this_prologue_cache, | |
796 | struct frame_id *this_id) | |
c906108c | 797 | { |
d2427a71 RH |
798 | struct alpha_sigtramp_unwind_cache *info |
799 | = alpha_sigtramp_frame_unwind_cache (next_frame, this_prologue_cache); | |
800 | struct gdbarch_tdep *tdep; | |
801 | CORE_ADDR stack_addr, code_addr; | |
802 | ||
803 | /* If the OSABI couldn't locate the sigcontext, give up. */ | |
804 | if (info->sigcontext_addr == 0) | |
805 | return; | |
806 | ||
807 | /* If we have dynamic signal trampolines, find their start. | |
808 | If we do not, then we must assume there is a symbol record | |
809 | that can provide the start address. */ | |
810 | tdep = gdbarch_tdep (current_gdbarch); | |
811 | if (tdep->dynamic_sigtramp_offset) | |
c906108c | 812 | { |
d2427a71 RH |
813 | int offset; |
814 | code_addr = frame_pc_unwind (next_frame); | |
815 | offset = tdep->dynamic_sigtramp_offset (code_addr); | |
816 | if (offset >= 0) | |
817 | code_addr -= offset; | |
c906108c | 818 | else |
d2427a71 | 819 | code_addr = 0; |
c906108c | 820 | } |
d2427a71 | 821 | else |
93d42b30 | 822 | code_addr = frame_func_unwind (next_frame, SIGTRAMP_FRAME); |
c906108c | 823 | |
d2427a71 RH |
824 | /* The stack address is trivially read from the sigcontext. */ |
825 | stack_addr = alpha_sigtramp_register_address (info->sigcontext_addr, | |
826 | ALPHA_SP_REGNUM); | |
b21fd293 RH |
827 | stack_addr = get_frame_memory_unsigned (next_frame, stack_addr, |
828 | ALPHA_REGISTER_SIZE); | |
c906108c | 829 | |
d2427a71 | 830 | *this_id = frame_id_build (stack_addr, code_addr); |
c906108c SS |
831 | } |
832 | ||
d2427a71 | 833 | /* Retrieve the value of REGNUM in FRAME. Don't give up! */ |
c906108c | 834 | |
d2427a71 RH |
835 | static void |
836 | alpha_sigtramp_frame_prev_register (struct frame_info *next_frame, | |
837 | void **this_prologue_cache, | |
838 | int regnum, int *optimizedp, | |
839 | enum lval_type *lvalp, CORE_ADDR *addrp, | |
5b819568 | 840 | int *realnump, gdb_byte *bufferp) |
c906108c | 841 | { |
d2427a71 RH |
842 | struct alpha_sigtramp_unwind_cache *info |
843 | = alpha_sigtramp_frame_unwind_cache (next_frame, this_prologue_cache); | |
844 | CORE_ADDR addr; | |
c906108c | 845 | |
d2427a71 | 846 | if (info->sigcontext_addr != 0) |
c906108c | 847 | { |
d2427a71 RH |
848 | /* All integer and fp registers are stored in memory. */ |
849 | addr = alpha_sigtramp_register_address (info->sigcontext_addr, regnum); | |
850 | if (addr != 0) | |
c906108c | 851 | { |
d2427a71 RH |
852 | *optimizedp = 0; |
853 | *lvalp = lval_memory; | |
854 | *addrp = addr; | |
855 | *realnump = -1; | |
856 | if (bufferp != NULL) | |
b21fd293 | 857 | get_frame_memory (next_frame, addr, bufferp, ALPHA_REGISTER_SIZE); |
d2427a71 | 858 | return; |
c906108c | 859 | } |
c906108c SS |
860 | } |
861 | ||
d2427a71 RH |
862 | /* This extra register may actually be in the sigcontext, but our |
863 | current description of it in alpha_sigtramp_frame_unwind_cache | |
864 | doesn't include it. Too bad. Fall back on whatever's in the | |
865 | outer frame. */ | |
5efde112 DJ |
866 | *optimizedp = 0; |
867 | *lvalp = lval_register; | |
868 | *addrp = 0; | |
869 | *realnump = regnum; | |
870 | if (bufferp) | |
871 | frame_unwind_register (next_frame, *realnump, bufferp); | |
d2427a71 | 872 | } |
c906108c | 873 | |
d2427a71 RH |
874 | static const struct frame_unwind alpha_sigtramp_frame_unwind = { |
875 | SIGTRAMP_FRAME, | |
876 | alpha_sigtramp_frame_this_id, | |
877 | alpha_sigtramp_frame_prev_register | |
878 | }; | |
c906108c | 879 | |
d2427a71 | 880 | static const struct frame_unwind * |
336d1bba | 881 | alpha_sigtramp_frame_sniffer (struct frame_info *next_frame) |
d2427a71 | 882 | { |
336d1bba | 883 | CORE_ADDR pc = frame_pc_unwind (next_frame); |
d2427a71 | 884 | char *name; |
c906108c | 885 | |
f2524b93 AC |
886 | /* NOTE: cagney/2004-04-30: Do not copy/clone this code. Instead |
887 | look at tramp-frame.h and other simplier per-architecture | |
888 | sigtramp unwinders. */ | |
889 | ||
890 | /* We shouldn't even bother to try if the OSABI didn't register a | |
891 | sigcontext_addr handler or pc_in_sigtramp hander. */ | |
892 | if (gdbarch_tdep (current_gdbarch)->sigcontext_addr == NULL) | |
893 | return NULL; | |
894 | if (gdbarch_tdep (current_gdbarch)->pc_in_sigtramp == NULL) | |
d2427a71 | 895 | return NULL; |
c906108c | 896 | |
d2427a71 RH |
897 | /* Otherwise we should be in a signal frame. */ |
898 | find_pc_partial_function (pc, &name, NULL, NULL); | |
f2524b93 | 899 | if (gdbarch_tdep (current_gdbarch)->pc_in_sigtramp (pc, name)) |
d2427a71 | 900 | return &alpha_sigtramp_frame_unwind; |
c906108c | 901 | |
d2427a71 | 902 | return NULL; |
c906108c | 903 | } |
d2427a71 RH |
904 | \f |
905 | /* Fallback alpha frame unwinder. Uses instruction scanning and knows | |
906 | something about the traditional layout of alpha stack frames. */ | |
c906108c | 907 | |
d2427a71 | 908 | struct alpha_heuristic_unwind_cache |
c906108c | 909 | { |
d2427a71 RH |
910 | CORE_ADDR *saved_regs; |
911 | CORE_ADDR vfp; | |
912 | CORE_ADDR start_pc; | |
913 | int return_reg; | |
914 | }; | |
c906108c | 915 | |
d2427a71 RH |
916 | /* Heuristic_proc_start may hunt through the text section for a long |
917 | time across a 2400 baud serial line. Allows the user to limit this | |
918 | search. */ | |
919 | static unsigned int heuristic_fence_post = 0; | |
c906108c | 920 | |
d2427a71 RH |
921 | /* Attempt to locate the start of the function containing PC. We assume that |
922 | the previous function ends with an about_to_return insn. Not foolproof by | |
923 | any means, since gcc is happy to put the epilogue in the middle of a | |
924 | function. But we're guessing anyway... */ | |
c906108c | 925 | |
d2427a71 RH |
926 | static CORE_ADDR |
927 | alpha_heuristic_proc_start (CORE_ADDR pc) | |
928 | { | |
929 | struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); | |
930 | CORE_ADDR last_non_nop = pc; | |
931 | CORE_ADDR fence = pc - heuristic_fence_post; | |
932 | CORE_ADDR orig_pc = pc; | |
fbe586ae | 933 | CORE_ADDR func; |
9e0b60a8 | 934 | |
d2427a71 RH |
935 | if (pc == 0) |
936 | return 0; | |
9e0b60a8 | 937 | |
fbe586ae RH |
938 | /* First see if we can find the start of the function from minimal |
939 | symbol information. This can succeed with a binary that doesn't | |
940 | have debug info, but hasn't been stripped. */ | |
941 | func = get_pc_function_start (pc); | |
942 | if (func) | |
943 | return func; | |
944 | ||
d2427a71 RH |
945 | if (heuristic_fence_post == UINT_MAX |
946 | || fence < tdep->vm_min_address) | |
947 | fence = tdep->vm_min_address; | |
c906108c | 948 | |
d2427a71 RH |
949 | /* Search back for previous return; also stop at a 0, which might be |
950 | seen for instance before the start of a code section. Don't include | |
951 | nops, since this usually indicates padding between functions. */ | |
e8d2d628 | 952 | for (pc -= ALPHA_INSN_SIZE; pc >= fence; pc -= ALPHA_INSN_SIZE) |
c906108c | 953 | { |
d2427a71 RH |
954 | unsigned int insn = alpha_read_insn (pc); |
955 | switch (insn) | |
c906108c | 956 | { |
d2427a71 RH |
957 | case 0: /* invalid insn */ |
958 | case 0x6bfa8001: /* ret $31,($26),1 */ | |
959 | return last_non_nop; | |
960 | ||
961 | case 0x2ffe0000: /* unop: ldq_u $31,0($30) */ | |
962 | case 0x47ff041f: /* nop: bis $31,$31,$31 */ | |
963 | break; | |
964 | ||
965 | default: | |
966 | last_non_nop = pc; | |
967 | break; | |
c906108c | 968 | } |
d2427a71 | 969 | } |
c906108c | 970 | |
d2427a71 RH |
971 | /* It's not clear to me why we reach this point when stopping quietly, |
972 | but with this test, at least we don't print out warnings for every | |
973 | child forked (eg, on decstation). 22apr93 rich@cygnus.com. */ | |
974 | if (stop_soon == NO_STOP_QUIETLY) | |
975 | { | |
976 | static int blurb_printed = 0; | |
c906108c | 977 | |
d2427a71 | 978 | if (fence == tdep->vm_min_address) |
323e0a4a AC |
979 | warning (_("Hit beginning of text section without finding \ |
980 | enclosing function for address 0x%s"), paddr_nz (orig_pc)); | |
c906108c | 981 | else |
323e0a4a AC |
982 | warning (_("Hit heuristic-fence-post without finding \ |
983 | enclosing function for address 0x%s"), paddr_nz (orig_pc)); | |
c906108c | 984 | |
d2427a71 RH |
985 | if (!blurb_printed) |
986 | { | |
323e0a4a | 987 | printf_filtered (_("\ |
d2427a71 RH |
988 | This warning occurs if you are debugging a function without any symbols\n\ |
989 | (for example, in a stripped executable). In that case, you may wish to\n\ | |
990 | increase the size of the search with the `set heuristic-fence-post' command.\n\ | |
991 | \n\ | |
992 | Otherwise, you told GDB there was a function where there isn't one, or\n\ | |
323e0a4a | 993 | (more likely) you have encountered a bug in GDB.\n")); |
d2427a71 RH |
994 | blurb_printed = 1; |
995 | } | |
996 | } | |
c906108c | 997 | |
d2427a71 RH |
998 | return 0; |
999 | } | |
c906108c | 1000 | |
fbe586ae | 1001 | static struct alpha_heuristic_unwind_cache * |
d2427a71 RH |
1002 | alpha_heuristic_frame_unwind_cache (struct frame_info *next_frame, |
1003 | void **this_prologue_cache, | |
1004 | CORE_ADDR start_pc) | |
1005 | { | |
1006 | struct alpha_heuristic_unwind_cache *info; | |
1007 | ULONGEST val; | |
1008 | CORE_ADDR limit_pc, cur_pc; | |
1009 | int frame_reg, frame_size, return_reg, reg; | |
c906108c | 1010 | |
d2427a71 RH |
1011 | if (*this_prologue_cache) |
1012 | return *this_prologue_cache; | |
c906108c | 1013 | |
d2427a71 RH |
1014 | info = FRAME_OBSTACK_ZALLOC (struct alpha_heuristic_unwind_cache); |
1015 | *this_prologue_cache = info; | |
1016 | info->saved_regs = frame_obstack_zalloc (SIZEOF_FRAME_SAVED_REGS); | |
c906108c | 1017 | |
d2427a71 RH |
1018 | limit_pc = frame_pc_unwind (next_frame); |
1019 | if (start_pc == 0) | |
1020 | start_pc = alpha_heuristic_proc_start (limit_pc); | |
1021 | info->start_pc = start_pc; | |
c906108c | 1022 | |
d2427a71 RH |
1023 | frame_reg = ALPHA_SP_REGNUM; |
1024 | frame_size = 0; | |
1025 | return_reg = -1; | |
c906108c | 1026 | |
d2427a71 RH |
1027 | /* If we've identified a likely place to start, do code scanning. */ |
1028 | if (start_pc != 0) | |
c5aa993b | 1029 | { |
d2427a71 RH |
1030 | /* Limit the forward search to 50 instructions. */ |
1031 | if (start_pc + 200 < limit_pc) | |
1032 | limit_pc = start_pc + 200; | |
c5aa993b | 1033 | |
e8d2d628 | 1034 | for (cur_pc = start_pc; cur_pc < limit_pc; cur_pc += ALPHA_INSN_SIZE) |
d2427a71 RH |
1035 | { |
1036 | unsigned int word = alpha_read_insn (cur_pc); | |
c5aa993b | 1037 | |
d2427a71 RH |
1038 | if ((word & 0xffff0000) == 0x23de0000) /* lda $sp,n($sp) */ |
1039 | { | |
1040 | if (word & 0x8000) | |
1041 | { | |
1042 | /* Consider only the first stack allocation instruction | |
1043 | to contain the static size of the frame. */ | |
1044 | if (frame_size == 0) | |
1045 | frame_size = (-word) & 0xffff; | |
1046 | } | |
1047 | else | |
1048 | { | |
1049 | /* Exit loop if a positive stack adjustment is found, which | |
1050 | usually means that the stack cleanup code in the function | |
1051 | epilogue is reached. */ | |
1052 | break; | |
1053 | } | |
1054 | } | |
1055 | else if ((word & 0xfc1f0000) == 0xb41e0000) /* stq reg,n($sp) */ | |
1056 | { | |
1057 | reg = (word & 0x03e00000) >> 21; | |
1058 | ||
d15bfd3a AC |
1059 | /* Ignore this instruction if we have already encountered |
1060 | an instruction saving the same register earlier in the | |
1061 | function code. The current instruction does not tell | |
1062 | us where the original value upon function entry is saved. | |
1063 | All it says is that the function we are scanning reused | |
1064 | that register for some computation of its own, and is now | |
1065 | saving its result. */ | |
1066 | if (info->saved_regs[reg]) | |
1067 | continue; | |
1068 | ||
d2427a71 RH |
1069 | if (reg == 31) |
1070 | continue; | |
1071 | ||
1072 | /* Do not compute the address where the register was saved yet, | |
1073 | because we don't know yet if the offset will need to be | |
1074 | relative to $sp or $fp (we can not compute the address | |
1075 | relative to $sp if $sp is updated during the execution of | |
1076 | the current subroutine, for instance when doing some alloca). | |
1077 | So just store the offset for the moment, and compute the | |
1078 | address later when we know whether this frame has a frame | |
1079 | pointer or not. */ | |
1080 | /* Hack: temporarily add one, so that the offset is non-zero | |
1081 | and we can tell which registers have save offsets below. */ | |
1082 | info->saved_regs[reg] = (word & 0xffff) + 1; | |
1083 | ||
1084 | /* Starting with OSF/1-3.2C, the system libraries are shipped | |
1085 | without local symbols, but they still contain procedure | |
1086 | descriptors without a symbol reference. GDB is currently | |
1087 | unable to find these procedure descriptors and uses | |
1088 | heuristic_proc_desc instead. | |
1089 | As some low level compiler support routines (__div*, __add*) | |
1090 | use a non-standard return address register, we have to | |
1091 | add some heuristics to determine the return address register, | |
1092 | or stepping over these routines will fail. | |
1093 | Usually the return address register is the first register | |
1094 | saved on the stack, but assembler optimization might | |
1095 | rearrange the register saves. | |
1096 | So we recognize only a few registers (t7, t9, ra) within | |
1097 | the procedure prologue as valid return address registers. | |
1098 | If we encounter a return instruction, we extract the | |
1099 | the return address register from it. | |
1100 | ||
1101 | FIXME: Rewriting GDB to access the procedure descriptors, | |
1102 | e.g. via the minimal symbol table, might obviate this hack. */ | |
1103 | if (return_reg == -1 | |
1104 | && cur_pc < (start_pc + 80) | |
1105 | && (reg == ALPHA_T7_REGNUM | |
1106 | || reg == ALPHA_T9_REGNUM | |
1107 | || reg == ALPHA_RA_REGNUM)) | |
1108 | return_reg = reg; | |
1109 | } | |
1110 | else if ((word & 0xffe0ffff) == 0x6be08001) /* ret zero,reg,1 */ | |
1111 | return_reg = (word >> 16) & 0x1f; | |
1112 | else if (word == 0x47de040f) /* bis sp,sp,fp */ | |
1113 | frame_reg = ALPHA_GCC_FP_REGNUM; | |
1114 | else if (word == 0x47fe040f) /* bis zero,sp,fp */ | |
1115 | frame_reg = ALPHA_GCC_FP_REGNUM; | |
1116 | } | |
c5aa993b | 1117 | |
d2427a71 RH |
1118 | /* If we haven't found a valid return address register yet, keep |
1119 | searching in the procedure prologue. */ | |
1120 | if (return_reg == -1) | |
1121 | { | |
1122 | while (cur_pc < (limit_pc + 80) && cur_pc < (start_pc + 80)) | |
1123 | { | |
1124 | unsigned int word = alpha_read_insn (cur_pc); | |
c5aa993b | 1125 | |
d2427a71 RH |
1126 | if ((word & 0xfc1f0000) == 0xb41e0000) /* stq reg,n($sp) */ |
1127 | { | |
1128 | reg = (word & 0x03e00000) >> 21; | |
1129 | if (reg == ALPHA_T7_REGNUM | |
1130 | || reg == ALPHA_T9_REGNUM | |
1131 | || reg == ALPHA_RA_REGNUM) | |
1132 | { | |
1133 | return_reg = reg; | |
1134 | break; | |
1135 | } | |
1136 | } | |
1137 | else if ((word & 0xffe0ffff) == 0x6be08001) /* ret zero,reg,1 */ | |
1138 | { | |
1139 | return_reg = (word >> 16) & 0x1f; | |
1140 | break; | |
1141 | } | |
85b32d22 | 1142 | |
e8d2d628 | 1143 | cur_pc += ALPHA_INSN_SIZE; |
d2427a71 RH |
1144 | } |
1145 | } | |
c906108c | 1146 | } |
c906108c | 1147 | |
d2427a71 RH |
1148 | /* Failing that, do default to the customary RA. */ |
1149 | if (return_reg == -1) | |
1150 | return_reg = ALPHA_RA_REGNUM; | |
1151 | info->return_reg = return_reg; | |
f8453e34 | 1152 | |
d2427a71 RH |
1153 | frame_unwind_unsigned_register (next_frame, frame_reg, &val); |
1154 | info->vfp = val + frame_size; | |
c906108c | 1155 | |
d2427a71 RH |
1156 | /* Convert offsets to absolute addresses. See above about adding |
1157 | one to the offsets to make all detected offsets non-zero. */ | |
1158 | for (reg = 0; reg < ALPHA_NUM_REGS; ++reg) | |
1159 | if (info->saved_regs[reg]) | |
1160 | info->saved_regs[reg] += val - 1; | |
1161 | ||
1162 | return info; | |
c906108c | 1163 | } |
c906108c | 1164 | |
d2427a71 RH |
1165 | /* Given a GDB frame, determine the address of the calling function's |
1166 | frame. This will be used to create a new GDB frame struct. */ | |
1167 | ||
fbe586ae | 1168 | static void |
d2427a71 RH |
1169 | alpha_heuristic_frame_this_id (struct frame_info *next_frame, |
1170 | void **this_prologue_cache, | |
1171 | struct frame_id *this_id) | |
c906108c | 1172 | { |
d2427a71 RH |
1173 | struct alpha_heuristic_unwind_cache *info |
1174 | = alpha_heuristic_frame_unwind_cache (next_frame, this_prologue_cache, 0); | |
c906108c | 1175 | |
d2427a71 | 1176 | *this_id = frame_id_build (info->vfp, info->start_pc); |
c906108c SS |
1177 | } |
1178 | ||
d2427a71 RH |
1179 | /* Retrieve the value of REGNUM in FRAME. Don't give up! */ |
1180 | ||
fbe586ae | 1181 | static void |
d2427a71 RH |
1182 | alpha_heuristic_frame_prev_register (struct frame_info *next_frame, |
1183 | void **this_prologue_cache, | |
1184 | int regnum, int *optimizedp, | |
1185 | enum lval_type *lvalp, CORE_ADDR *addrp, | |
5b819568 | 1186 | int *realnump, gdb_byte *bufferp) |
c906108c | 1187 | { |
d2427a71 RH |
1188 | struct alpha_heuristic_unwind_cache *info |
1189 | = alpha_heuristic_frame_unwind_cache (next_frame, this_prologue_cache, 0); | |
1190 | ||
1191 | /* The PC of the previous frame is stored in the link register of | |
1192 | the current frame. Frob regnum so that we pull the value from | |
1193 | the correct place. */ | |
1194 | if (regnum == ALPHA_PC_REGNUM) | |
1195 | regnum = info->return_reg; | |
1196 | ||
1197 | /* For all registers known to be saved in the current frame, | |
1198 | do the obvious and pull the value out. */ | |
1199 | if (info->saved_regs[regnum]) | |
c906108c | 1200 | { |
d2427a71 RH |
1201 | *optimizedp = 0; |
1202 | *lvalp = lval_memory; | |
1203 | *addrp = info->saved_regs[regnum]; | |
1204 | *realnump = -1; | |
1205 | if (bufferp != NULL) | |
b21fd293 | 1206 | get_frame_memory (next_frame, *addrp, bufferp, ALPHA_REGISTER_SIZE); |
c906108c SS |
1207 | return; |
1208 | } | |
1209 | ||
d2427a71 RH |
1210 | /* The stack pointer of the previous frame is computed by popping |
1211 | the current stack frame. */ | |
1212 | if (regnum == ALPHA_SP_REGNUM) | |
c906108c | 1213 | { |
d2427a71 RH |
1214 | *optimizedp = 0; |
1215 | *lvalp = not_lval; | |
1216 | *addrp = 0; | |
1217 | *realnump = -1; | |
1218 | if (bufferp != NULL) | |
1219 | store_unsigned_integer (bufferp, ALPHA_REGISTER_SIZE, info->vfp); | |
1220 | return; | |
c906108c | 1221 | } |
95b80706 | 1222 | |
d2427a71 | 1223 | /* Otherwise assume the next frame has the same register value. */ |
5efde112 DJ |
1224 | *optimizedp = 0; |
1225 | *lvalp = lval_register; | |
1226 | *addrp = 0; | |
1227 | *realnump = regnum; | |
1228 | if (bufferp) | |
1229 | frame_unwind_register (next_frame, *realnump, bufferp); | |
95b80706 JT |
1230 | } |
1231 | ||
d2427a71 RH |
1232 | static const struct frame_unwind alpha_heuristic_frame_unwind = { |
1233 | NORMAL_FRAME, | |
1234 | alpha_heuristic_frame_this_id, | |
1235 | alpha_heuristic_frame_prev_register | |
1236 | }; | |
c906108c | 1237 | |
d2427a71 | 1238 | static const struct frame_unwind * |
336d1bba | 1239 | alpha_heuristic_frame_sniffer (struct frame_info *next_frame) |
c906108c | 1240 | { |
d2427a71 | 1241 | return &alpha_heuristic_frame_unwind; |
c906108c SS |
1242 | } |
1243 | ||
fbe586ae | 1244 | static CORE_ADDR |
d2427a71 RH |
1245 | alpha_heuristic_frame_base_address (struct frame_info *next_frame, |
1246 | void **this_prologue_cache) | |
c906108c | 1247 | { |
d2427a71 RH |
1248 | struct alpha_heuristic_unwind_cache *info |
1249 | = alpha_heuristic_frame_unwind_cache (next_frame, this_prologue_cache, 0); | |
c906108c | 1250 | |
d2427a71 | 1251 | return info->vfp; |
c906108c SS |
1252 | } |
1253 | ||
d2427a71 RH |
1254 | static const struct frame_base alpha_heuristic_frame_base = { |
1255 | &alpha_heuristic_frame_unwind, | |
1256 | alpha_heuristic_frame_base_address, | |
1257 | alpha_heuristic_frame_base_address, | |
1258 | alpha_heuristic_frame_base_address | |
1259 | }; | |
1260 | ||
c906108c | 1261 | /* Just like reinit_frame_cache, but with the right arguments to be |
d2427a71 | 1262 | callable as an sfunc. Used by the "set heuristic-fence-post" command. */ |
c906108c SS |
1263 | |
1264 | static void | |
fba45db2 | 1265 | reinit_frame_cache_sfunc (char *args, int from_tty, struct cmd_list_element *c) |
c906108c SS |
1266 | { |
1267 | reinit_frame_cache (); | |
1268 | } | |
1269 | ||
d2427a71 | 1270 | \f |
d2427a71 RH |
1271 | /* Assuming NEXT_FRAME->prev is a dummy, return the frame ID of that |
1272 | dummy frame. The frame ID's base needs to match the TOS value | |
1273 | saved by save_dummy_frame_tos(), and the PC match the dummy frame's | |
1274 | breakpoint. */ | |
d734c450 | 1275 | |
d2427a71 RH |
1276 | static struct frame_id |
1277 | alpha_unwind_dummy_id (struct gdbarch *gdbarch, struct frame_info *next_frame) | |
0d056799 | 1278 | { |
d2427a71 RH |
1279 | ULONGEST base; |
1280 | frame_unwind_unsigned_register (next_frame, ALPHA_SP_REGNUM, &base); | |
1281 | return frame_id_build (base, frame_pc_unwind (next_frame)); | |
0d056799 JT |
1282 | } |
1283 | ||
dc129d82 | 1284 | static CORE_ADDR |
d2427a71 | 1285 | alpha_unwind_pc (struct gdbarch *gdbarch, struct frame_info *next_frame) |
accc6d1f | 1286 | { |
d2427a71 RH |
1287 | ULONGEST pc; |
1288 | frame_unwind_unsigned_register (next_frame, ALPHA_PC_REGNUM, &pc); | |
1289 | return pc; | |
accc6d1f JT |
1290 | } |
1291 | ||
98a8e1e5 RH |
1292 | \f |
1293 | /* Helper routines for alpha*-nat.c files to move register sets to and | |
1294 | from core files. The UNIQUE pointer is allowed to be NULL, as most | |
1295 | targets don't supply this value in their core files. */ | |
1296 | ||
1297 | void | |
390c1522 UW |
1298 | alpha_supply_int_regs (struct regcache *regcache, int regno, |
1299 | const void *r0_r30, const void *pc, const void *unique) | |
98a8e1e5 | 1300 | { |
2a1ce6ec | 1301 | const gdb_byte *regs = r0_r30; |
98a8e1e5 RH |
1302 | int i; |
1303 | ||
1304 | for (i = 0; i < 31; ++i) | |
1305 | if (regno == i || regno == -1) | |
390c1522 | 1306 | regcache_raw_supply (regcache, i, regs + i * 8); |
98a8e1e5 RH |
1307 | |
1308 | if (regno == ALPHA_ZERO_REGNUM || regno == -1) | |
390c1522 | 1309 | regcache_raw_supply (regcache, ALPHA_ZERO_REGNUM, NULL); |
98a8e1e5 RH |
1310 | |
1311 | if (regno == ALPHA_PC_REGNUM || regno == -1) | |
390c1522 | 1312 | regcache_raw_supply (regcache, ALPHA_PC_REGNUM, pc); |
98a8e1e5 RH |
1313 | |
1314 | if (regno == ALPHA_UNIQUE_REGNUM || regno == -1) | |
390c1522 | 1315 | regcache_raw_supply (regcache, ALPHA_UNIQUE_REGNUM, unique); |
98a8e1e5 RH |
1316 | } |
1317 | ||
1318 | void | |
390c1522 UW |
1319 | alpha_fill_int_regs (const struct regcache *regcache, |
1320 | int regno, void *r0_r30, void *pc, void *unique) | |
98a8e1e5 | 1321 | { |
2a1ce6ec | 1322 | gdb_byte *regs = r0_r30; |
98a8e1e5 RH |
1323 | int i; |
1324 | ||
1325 | for (i = 0; i < 31; ++i) | |
1326 | if (regno == i || regno == -1) | |
390c1522 | 1327 | regcache_raw_collect (regcache, i, regs + i * 8); |
98a8e1e5 RH |
1328 | |
1329 | if (regno == ALPHA_PC_REGNUM || regno == -1) | |
390c1522 | 1330 | regcache_raw_collect (regcache, ALPHA_PC_REGNUM, pc); |
98a8e1e5 RH |
1331 | |
1332 | if (unique && (regno == ALPHA_UNIQUE_REGNUM || regno == -1)) | |
390c1522 | 1333 | regcache_raw_collect (regcache, ALPHA_UNIQUE_REGNUM, unique); |
98a8e1e5 RH |
1334 | } |
1335 | ||
1336 | void | |
390c1522 UW |
1337 | alpha_supply_fp_regs (struct regcache *regcache, int regno, |
1338 | const void *f0_f30, const void *fpcr) | |
98a8e1e5 | 1339 | { |
2a1ce6ec | 1340 | const gdb_byte *regs = f0_f30; |
98a8e1e5 RH |
1341 | int i; |
1342 | ||
1343 | for (i = ALPHA_FP0_REGNUM; i < ALPHA_FP0_REGNUM + 31; ++i) | |
1344 | if (regno == i || regno == -1) | |
390c1522 | 1345 | regcache_raw_supply (regcache, i, |
2a1ce6ec | 1346 | regs + (i - ALPHA_FP0_REGNUM) * 8); |
98a8e1e5 RH |
1347 | |
1348 | if (regno == ALPHA_FPCR_REGNUM || regno == -1) | |
390c1522 | 1349 | regcache_raw_supply (regcache, ALPHA_FPCR_REGNUM, fpcr); |
98a8e1e5 RH |
1350 | } |
1351 | ||
1352 | void | |
390c1522 UW |
1353 | alpha_fill_fp_regs (const struct regcache *regcache, |
1354 | int regno, void *f0_f30, void *fpcr) | |
98a8e1e5 | 1355 | { |
2a1ce6ec | 1356 | gdb_byte *regs = f0_f30; |
98a8e1e5 RH |
1357 | int i; |
1358 | ||
1359 | for (i = ALPHA_FP0_REGNUM; i < ALPHA_FP0_REGNUM + 31; ++i) | |
1360 | if (regno == i || regno == -1) | |
390c1522 | 1361 | regcache_raw_collect (regcache, i, |
2a1ce6ec | 1362 | regs + (i - ALPHA_FP0_REGNUM) * 8); |
98a8e1e5 RH |
1363 | |
1364 | if (regno == ALPHA_FPCR_REGNUM || regno == -1) | |
390c1522 | 1365 | regcache_raw_collect (regcache, ALPHA_FPCR_REGNUM, fpcr); |
98a8e1e5 RH |
1366 | } |
1367 | ||
d2427a71 | 1368 | \f |
0de94d4b JB |
1369 | |
1370 | /* Return nonzero if the G_floating register value in REG is equal to | |
1371 | zero for FP control instructions. */ | |
1372 | ||
1373 | static int | |
1374 | fp_register_zero_p (LONGEST reg) | |
1375 | { | |
1376 | /* Check that all bits except the sign bit are zero. */ | |
1377 | const LONGEST zero_mask = ((LONGEST) 1 << 63) ^ -1; | |
1378 | ||
1379 | return ((reg & zero_mask) == 0); | |
1380 | } | |
1381 | ||
1382 | /* Return the value of the sign bit for the G_floating register | |
1383 | value held in REG. */ | |
1384 | ||
1385 | static int | |
1386 | fp_register_sign_bit (LONGEST reg) | |
1387 | { | |
1388 | const LONGEST sign_mask = (LONGEST) 1 << 63; | |
1389 | ||
1390 | return ((reg & sign_mask) != 0); | |
1391 | } | |
1392 | ||
ec32e4be JT |
1393 | /* alpha_software_single_step() is called just before we want to resume |
1394 | the inferior, if we want to single-step it but there is no hardware | |
1395 | or kernel single-step support (NetBSD on Alpha, for example). We find | |
e0cd558a | 1396 | the target of the coming instruction and breakpoint it. */ |
ec32e4be JT |
1397 | |
1398 | static CORE_ADDR | |
0b1b3e42 | 1399 | alpha_next_pc (struct frame_info *frame, CORE_ADDR pc) |
ec32e4be JT |
1400 | { |
1401 | unsigned int insn; | |
1402 | unsigned int op; | |
551e4f2e | 1403 | int regno; |
ec32e4be JT |
1404 | int offset; |
1405 | LONGEST rav; | |
1406 | ||
b21fd293 | 1407 | insn = alpha_read_insn (pc); |
ec32e4be JT |
1408 | |
1409 | /* Opcode is top 6 bits. */ | |
1410 | op = (insn >> 26) & 0x3f; | |
1411 | ||
1412 | if (op == 0x1a) | |
1413 | { | |
1414 | /* Jump format: target PC is: | |
1415 | RB & ~3 */ | |
0b1b3e42 | 1416 | return (get_frame_register_unsigned (frame, (insn >> 16) & 0x1f) & ~3); |
ec32e4be JT |
1417 | } |
1418 | ||
1419 | if ((op & 0x30) == 0x30) | |
1420 | { | |
1421 | /* Branch format: target PC is: | |
1422 | (new PC) + (4 * sext(displacement)) */ | |
1423 | if (op == 0x30 || /* BR */ | |
1424 | op == 0x34) /* BSR */ | |
1425 | { | |
1426 | branch_taken: | |
1427 | offset = (insn & 0x001fffff); | |
1428 | if (offset & 0x00100000) | |
1429 | offset |= 0xffe00000; | |
e8d2d628 MK |
1430 | offset *= ALPHA_INSN_SIZE; |
1431 | return (pc + ALPHA_INSN_SIZE + offset); | |
ec32e4be JT |
1432 | } |
1433 | ||
1434 | /* Need to determine if branch is taken; read RA. */ | |
551e4f2e JB |
1435 | regno = (insn >> 21) & 0x1f; |
1436 | switch (op) | |
1437 | { | |
1438 | case 0x31: /* FBEQ */ | |
1439 | case 0x36: /* FBGE */ | |
1440 | case 0x37: /* FBGT */ | |
1441 | case 0x33: /* FBLE */ | |
1442 | case 0x32: /* FBLT */ | |
1443 | case 0x35: /* FBNE */ | |
3e8c568d | 1444 | regno += gdbarch_fp0_regnum (current_gdbarch); |
551e4f2e JB |
1445 | } |
1446 | ||
0b1b3e42 | 1447 | rav = get_frame_register_signed (frame, regno); |
0de94d4b | 1448 | |
ec32e4be JT |
1449 | switch (op) |
1450 | { | |
1451 | case 0x38: /* BLBC */ | |
1452 | if ((rav & 1) == 0) | |
1453 | goto branch_taken; | |
1454 | break; | |
1455 | case 0x3c: /* BLBS */ | |
1456 | if (rav & 1) | |
1457 | goto branch_taken; | |
1458 | break; | |
1459 | case 0x39: /* BEQ */ | |
1460 | if (rav == 0) | |
1461 | goto branch_taken; | |
1462 | break; | |
1463 | case 0x3d: /* BNE */ | |
1464 | if (rav != 0) | |
1465 | goto branch_taken; | |
1466 | break; | |
1467 | case 0x3a: /* BLT */ | |
1468 | if (rav < 0) | |
1469 | goto branch_taken; | |
1470 | break; | |
1471 | case 0x3b: /* BLE */ | |
1472 | if (rav <= 0) | |
1473 | goto branch_taken; | |
1474 | break; | |
1475 | case 0x3f: /* BGT */ | |
1476 | if (rav > 0) | |
1477 | goto branch_taken; | |
1478 | break; | |
1479 | case 0x3e: /* BGE */ | |
1480 | if (rav >= 0) | |
1481 | goto branch_taken; | |
1482 | break; | |
d2427a71 | 1483 | |
0de94d4b JB |
1484 | /* Floating point branches. */ |
1485 | ||
1486 | case 0x31: /* FBEQ */ | |
1487 | if (fp_register_zero_p (rav)) | |
1488 | goto branch_taken; | |
1489 | break; | |
1490 | case 0x36: /* FBGE */ | |
1491 | if (fp_register_sign_bit (rav) == 0 || fp_register_zero_p (rav)) | |
1492 | goto branch_taken; | |
1493 | break; | |
1494 | case 0x37: /* FBGT */ | |
1495 | if (fp_register_sign_bit (rav) == 0 && ! fp_register_zero_p (rav)) | |
1496 | goto branch_taken; | |
1497 | break; | |
1498 | case 0x33: /* FBLE */ | |
1499 | if (fp_register_sign_bit (rav) == 1 || fp_register_zero_p (rav)) | |
1500 | goto branch_taken; | |
1501 | break; | |
1502 | case 0x32: /* FBLT */ | |
1503 | if (fp_register_sign_bit (rav) == 1 && ! fp_register_zero_p (rav)) | |
1504 | goto branch_taken; | |
1505 | break; | |
1506 | case 0x35: /* FBNE */ | |
1507 | if (! fp_register_zero_p (rav)) | |
1508 | goto branch_taken; | |
1509 | break; | |
ec32e4be JT |
1510 | } |
1511 | } | |
1512 | ||
1513 | /* Not a branch or branch not taken; target PC is: | |
1514 | pc + 4 */ | |
e8d2d628 | 1515 | return (pc + ALPHA_INSN_SIZE); |
ec32e4be JT |
1516 | } |
1517 | ||
e6590a1b | 1518 | int |
0b1b3e42 | 1519 | alpha_software_single_step (struct frame_info *frame) |
ec32e4be | 1520 | { |
e0cd558a | 1521 | CORE_ADDR pc, next_pc; |
ec32e4be | 1522 | |
0b1b3e42 UW |
1523 | pc = get_frame_pc (frame); |
1524 | next_pc = alpha_next_pc (frame, pc); | |
ec32e4be | 1525 | |
e0cd558a | 1526 | insert_single_step_breakpoint (next_pc); |
e6590a1b | 1527 | return 1; |
c906108c SS |
1528 | } |
1529 | ||
dc129d82 | 1530 | \f |
dc129d82 JT |
1531 | /* Initialize the current architecture based on INFO. If possible, re-use an |
1532 | architecture from ARCHES, which is a list of architectures already created | |
1533 | during this debugging session. | |
1534 | ||
1535 | Called e.g. at program startup, when reading a core file, and when reading | |
1536 | a binary file. */ | |
1537 | ||
1538 | static struct gdbarch * | |
1539 | alpha_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches) | |
1540 | { | |
1541 | struct gdbarch_tdep *tdep; | |
1542 | struct gdbarch *gdbarch; | |
dc129d82 JT |
1543 | |
1544 | /* Try to determine the ABI of the object we are loading. */ | |
4be87837 | 1545 | if (info.abfd != NULL && info.osabi == GDB_OSABI_UNKNOWN) |
dc129d82 | 1546 | { |
4be87837 DJ |
1547 | /* If it's an ECOFF file, assume it's OSF/1. */ |
1548 | if (bfd_get_flavour (info.abfd) == bfd_target_ecoff_flavour) | |
aff87235 | 1549 | info.osabi = GDB_OSABI_OSF1; |
dc129d82 JT |
1550 | } |
1551 | ||
1552 | /* Find a candidate among extant architectures. */ | |
4be87837 DJ |
1553 | arches = gdbarch_list_lookup_by_info (arches, &info); |
1554 | if (arches != NULL) | |
1555 | return arches->gdbarch; | |
dc129d82 JT |
1556 | |
1557 | tdep = xmalloc (sizeof (struct gdbarch_tdep)); | |
1558 | gdbarch = gdbarch_alloc (&info, tdep); | |
1559 | ||
d2427a71 RH |
1560 | /* Lowest text address. This is used by heuristic_proc_start() |
1561 | to decide when to stop looking. */ | |
594706e6 | 1562 | tdep->vm_min_address = (CORE_ADDR) 0x120000000LL; |
d9b023cc | 1563 | |
36a6271d | 1564 | tdep->dynamic_sigtramp_offset = NULL; |
5868c862 | 1565 | tdep->sigcontext_addr = NULL; |
138e7be5 MK |
1566 | tdep->sc_pc_offset = 2 * 8; |
1567 | tdep->sc_regs_offset = 4 * 8; | |
1568 | tdep->sc_fpregs_offset = tdep->sc_regs_offset + 32 * 8 + 8; | |
36a6271d | 1569 | |
accc6d1f JT |
1570 | tdep->jb_pc = -1; /* longjmp support not enabled by default */ |
1571 | ||
9823e921 RH |
1572 | tdep->return_in_memory = alpha_return_in_memory_always; |
1573 | ||
dc129d82 JT |
1574 | /* Type sizes */ |
1575 | set_gdbarch_short_bit (gdbarch, 16); | |
1576 | set_gdbarch_int_bit (gdbarch, 32); | |
1577 | set_gdbarch_long_bit (gdbarch, 64); | |
1578 | set_gdbarch_long_long_bit (gdbarch, 64); | |
1579 | set_gdbarch_float_bit (gdbarch, 32); | |
1580 | set_gdbarch_double_bit (gdbarch, 64); | |
1581 | set_gdbarch_long_double_bit (gdbarch, 64); | |
1582 | set_gdbarch_ptr_bit (gdbarch, 64); | |
1583 | ||
1584 | /* Register info */ | |
1585 | set_gdbarch_num_regs (gdbarch, ALPHA_NUM_REGS); | |
1586 | set_gdbarch_sp_regnum (gdbarch, ALPHA_SP_REGNUM); | |
dc129d82 JT |
1587 | set_gdbarch_pc_regnum (gdbarch, ALPHA_PC_REGNUM); |
1588 | set_gdbarch_fp0_regnum (gdbarch, ALPHA_FP0_REGNUM); | |
1589 | ||
1590 | set_gdbarch_register_name (gdbarch, alpha_register_name); | |
c483c494 | 1591 | set_gdbarch_register_type (gdbarch, alpha_register_type); |
dc129d82 JT |
1592 | |
1593 | set_gdbarch_cannot_fetch_register (gdbarch, alpha_cannot_fetch_register); | |
1594 | set_gdbarch_cannot_store_register (gdbarch, alpha_cannot_store_register); | |
1595 | ||
c483c494 RH |
1596 | set_gdbarch_convert_register_p (gdbarch, alpha_convert_register_p); |
1597 | set_gdbarch_register_to_value (gdbarch, alpha_register_to_value); | |
1598 | set_gdbarch_value_to_register (gdbarch, alpha_value_to_register); | |
dc129d82 | 1599 | |
615967cb RH |
1600 | set_gdbarch_register_reggroup_p (gdbarch, alpha_register_reggroup_p); |
1601 | ||
d2427a71 | 1602 | /* Prologue heuristics. */ |
dc129d82 JT |
1603 | set_gdbarch_skip_prologue (gdbarch, alpha_skip_prologue); |
1604 | ||
5ef165c2 RH |
1605 | /* Disassembler. */ |
1606 | set_gdbarch_print_insn (gdbarch, print_insn_alpha); | |
1607 | ||
d2427a71 | 1608 | /* Call info. */ |
dc129d82 | 1609 | |
9823e921 | 1610 | set_gdbarch_return_value (gdbarch, alpha_return_value); |
dc129d82 JT |
1611 | |
1612 | /* Settings for calling functions in the inferior. */ | |
c88e30c0 | 1613 | set_gdbarch_push_dummy_call (gdbarch, alpha_push_dummy_call); |
d2427a71 RH |
1614 | |
1615 | /* Methods for saving / extracting a dummy frame's ID. */ | |
1616 | set_gdbarch_unwind_dummy_id (gdbarch, alpha_unwind_dummy_id); | |
d2427a71 RH |
1617 | |
1618 | /* Return the unwound PC value. */ | |
1619 | set_gdbarch_unwind_pc (gdbarch, alpha_unwind_pc); | |
dc129d82 JT |
1620 | |
1621 | set_gdbarch_inner_than (gdbarch, core_addr_lessthan); | |
36a6271d | 1622 | set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target); |
dc129d82 | 1623 | |
95b80706 | 1624 | set_gdbarch_breakpoint_from_pc (gdbarch, alpha_breakpoint_from_pc); |
e8d2d628 | 1625 | set_gdbarch_decr_pc_after_break (gdbarch, ALPHA_INSN_SIZE); |
9d519230 | 1626 | set_gdbarch_cannot_step_breakpoint (gdbarch, 1); |
95b80706 | 1627 | |
44dffaac | 1628 | /* Hook in ABI-specific overrides, if they have been registered. */ |
4be87837 | 1629 | gdbarch_init_osabi (info, gdbarch); |
44dffaac | 1630 | |
accc6d1f JT |
1631 | /* Now that we have tuned the configuration, set a few final things |
1632 | based on what the OS ABI has told us. */ | |
1633 | ||
1634 | if (tdep->jb_pc >= 0) | |
1635 | set_gdbarch_get_longjmp_target (gdbarch, alpha_get_longjmp_target); | |
1636 | ||
336d1bba AC |
1637 | frame_unwind_append_sniffer (gdbarch, alpha_sigtramp_frame_sniffer); |
1638 | frame_unwind_append_sniffer (gdbarch, alpha_heuristic_frame_sniffer); | |
dc129d82 | 1639 | |
d2427a71 | 1640 | frame_base_set_default (gdbarch, &alpha_heuristic_frame_base); |
accc6d1f | 1641 | |
d2427a71 | 1642 | return gdbarch; |
dc129d82 JT |
1643 | } |
1644 | ||
baa490c4 RH |
1645 | void |
1646 | alpha_dwarf2_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) | |
1647 | { | |
336d1bba AC |
1648 | frame_unwind_append_sniffer (gdbarch, dwarf2_frame_sniffer); |
1649 | frame_base_append_sniffer (gdbarch, dwarf2_frame_base_sniffer); | |
baa490c4 RH |
1650 | } |
1651 | ||
a78f21af AC |
1652 | extern initialize_file_ftype _initialize_alpha_tdep; /* -Wmissing-prototypes */ |
1653 | ||
c906108c | 1654 | void |
fba45db2 | 1655 | _initialize_alpha_tdep (void) |
c906108c SS |
1656 | { |
1657 | struct cmd_list_element *c; | |
1658 | ||
d2427a71 | 1659 | gdbarch_register (bfd_arch_alpha, alpha_gdbarch_init, NULL); |
c906108c SS |
1660 | |
1661 | /* Let the user set the fence post for heuristic_proc_start. */ | |
1662 | ||
1663 | /* We really would like to have both "0" and "unlimited" work, but | |
1664 | command.c doesn't deal with that. So make it a var_zinteger | |
1665 | because the user can always use "999999" or some such for unlimited. */ | |
edefbb7c AC |
1666 | /* We need to throw away the frame cache when we set this, since it |
1667 | might change our ability to get backtraces. */ | |
1668 | add_setshow_zinteger_cmd ("heuristic-fence-post", class_support, | |
7915a72c AC |
1669 | &heuristic_fence_post, _("\ |
1670 | Set the distance searched for the start of a function."), _("\ | |
1671 | Show the distance searched for the start of a function."), _("\ | |
c906108c SS |
1672 | If you are debugging a stripped executable, GDB needs to search through the\n\ |
1673 | program for the start of a function. This command sets the distance of the\n\ | |
323e0a4a | 1674 | search. The only need to set it is when debugging a stripped executable."), |
2c5b56ce | 1675 | reinit_frame_cache_sfunc, |
7915a72c | 1676 | NULL, /* FIXME: i18n: The distance searched for the start of a function is \"%d\". */ |
edefbb7c | 1677 | &setlist, &showlist); |
c906108c | 1678 | } |