Commit | Line | Data |
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c906108c | 1 | /* Target-dependent code for the ALPHA architecture, for GDB, the GNU Debugger. |
1e698235 | 2 | Copyright 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003 |
b6ba6518 | 3 | Free Software Foundation, Inc. |
c906108c | 4 | |
c5aa993b | 5 | This file is part of GDB. |
c906108c | 6 | |
c5aa993b JM |
7 | This program is free software; you can redistribute it and/or modify |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation; either version 2 of the License, or | |
10 | (at your option) any later version. | |
c906108c | 11 | |
c5aa993b JM |
12 | This program is distributed in the hope that it will be useful, |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
c906108c | 16 | |
c5aa993b JM |
17 | You should have received a copy of the GNU General Public License |
18 | along with this program; if not, write to the Free Software | |
19 | Foundation, Inc., 59 Temple Place - Suite 330, | |
20 | Boston, MA 02111-1307, USA. */ | |
c906108c SS |
21 | |
22 | #include "defs.h" | |
23 | #include "frame.h" | |
24 | #include "inferior.h" | |
25 | #include "symtab.h" | |
26 | #include "value.h" | |
27 | #include "gdbcmd.h" | |
28 | #include "gdbcore.h" | |
29 | #include "dis-asm.h" | |
30 | #include "symfile.h" | |
31 | #include "objfiles.h" | |
32 | #include "gdb_string.h" | |
c5f0f3d0 | 33 | #include "linespec.h" |
4e052eda | 34 | #include "regcache.h" |
d16aafd8 | 35 | #include "doublest.h" |
dc129d82 | 36 | #include "arch-utils.h" |
4be87837 | 37 | #include "osabi.h" |
fe898f56 | 38 | #include "block.h" |
dc129d82 JT |
39 | |
40 | #include "elf-bfd.h" | |
41 | ||
42 | #include "alpha-tdep.h" | |
43 | ||
44 | static gdbarch_init_ftype alpha_gdbarch_init; | |
45 | ||
46 | static gdbarch_register_name_ftype alpha_register_name; | |
47 | static gdbarch_register_raw_size_ftype alpha_register_raw_size; | |
48 | static gdbarch_register_virtual_size_ftype alpha_register_virtual_size; | |
49 | static gdbarch_register_virtual_type_ftype alpha_register_virtual_type; | |
50 | static gdbarch_register_byte_ftype alpha_register_byte; | |
51 | static gdbarch_cannot_fetch_register_ftype alpha_cannot_fetch_register; | |
52 | static gdbarch_cannot_store_register_ftype alpha_cannot_store_register; | |
53 | static gdbarch_register_convertible_ftype alpha_register_convertible; | |
54 | static gdbarch_register_convert_to_virtual_ftype | |
55 | alpha_register_convert_to_virtual; | |
56 | static gdbarch_register_convert_to_raw_ftype alpha_register_convert_to_raw; | |
57 | static gdbarch_store_struct_return_ftype alpha_store_struct_return; | |
26e9b323 | 58 | static gdbarch_deprecated_extract_return_value_ftype alpha_extract_return_value; |
26e9b323 | 59 | static gdbarch_deprecated_extract_struct_value_address_ftype |
dc129d82 JT |
60 | alpha_extract_struct_value_address; |
61 | static gdbarch_use_struct_convention_ftype alpha_use_struct_convention; | |
62 | ||
95b80706 JT |
63 | static gdbarch_breakpoint_from_pc_ftype alpha_breakpoint_from_pc; |
64 | ||
dc129d82 JT |
65 | static gdbarch_frame_args_address_ftype alpha_frame_args_address; |
66 | static gdbarch_frame_locals_address_ftype alpha_frame_locals_address; | |
67 | ||
68 | static gdbarch_skip_prologue_ftype alpha_skip_prologue; | |
dc129d82 | 69 | static gdbarch_saved_pc_after_call_ftype alpha_saved_pc_after_call; |
dc129d82 JT |
70 | |
71 | static gdbarch_push_arguments_ftype alpha_push_arguments; | |
dc129d82 | 72 | static gdbarch_fix_call_dummy_ftype alpha_fix_call_dummy; |
c906108c | 73 | |
accc6d1f JT |
74 | static gdbarch_get_longjmp_target_ftype alpha_get_longjmp_target; |
75 | ||
140f9984 JT |
76 | struct frame_extra_info |
77 | { | |
78 | alpha_extra_func_info_t proc_desc; | |
79 | int localoff; | |
80 | int pc_reg; | |
81 | }; | |
82 | ||
c906108c SS |
83 | /* FIXME: Some of this code should perhaps be merged with mips-tdep.c. */ |
84 | ||
85 | /* Prototypes for local functions. */ | |
86 | ||
140f9984 JT |
87 | static void alpha_find_saved_regs (struct frame_info *); |
88 | ||
a14ed312 | 89 | static alpha_extra_func_info_t push_sigtramp_desc (CORE_ADDR low_addr); |
c906108c | 90 | |
a14ed312 | 91 | static CORE_ADDR read_next_frame_reg (struct frame_info *, int); |
c906108c | 92 | |
a14ed312 | 93 | static CORE_ADDR heuristic_proc_start (CORE_ADDR); |
c906108c | 94 | |
a14ed312 KB |
95 | static alpha_extra_func_info_t heuristic_proc_desc (CORE_ADDR, |
96 | CORE_ADDR, | |
97 | struct frame_info *); | |
c906108c | 98 | |
a14ed312 KB |
99 | static alpha_extra_func_info_t find_proc_desc (CORE_ADDR, |
100 | struct frame_info *); | |
c906108c SS |
101 | |
102 | #if 0 | |
a14ed312 | 103 | static int alpha_in_lenient_prologue (CORE_ADDR, CORE_ADDR); |
c906108c SS |
104 | #endif |
105 | ||
a14ed312 | 106 | static void reinit_frame_cache_sfunc (char *, int, struct cmd_list_element *); |
c906108c | 107 | |
a14ed312 KB |
108 | static CORE_ADDR after_prologue (CORE_ADDR pc, |
109 | alpha_extra_func_info_t proc_desc); | |
c906108c | 110 | |
a14ed312 KB |
111 | static int alpha_in_prologue (CORE_ADDR pc, |
112 | alpha_extra_func_info_t proc_desc); | |
c906108c | 113 | |
a14ed312 | 114 | static int alpha_about_to_return (CORE_ADDR pc); |
392a587b | 115 | |
a14ed312 | 116 | void _initialize_alpha_tdep (void); |
392a587b | 117 | |
c906108c SS |
118 | /* Heuristic_proc_start may hunt through the text section for a long |
119 | time across a 2400 baud serial line. Allows the user to limit this | |
120 | search. */ | |
121 | static unsigned int heuristic_fence_post = 0; | |
c5aa993b | 122 | /* *INDENT-OFF* */ |
c906108c SS |
123 | /* Layout of a stack frame on the alpha: |
124 | ||
125 | | | | |
126 | pdr members: | 7th ... nth arg, | | |
127 | | `pushed' by caller. | | |
128 | | | | |
129 | ----------------|-------------------------------|<-- old_sp == vfp | |
130 | ^ ^ ^ ^ | | | |
131 | | | | | | | | |
132 | | |localoff | Copies of 1st .. 6th | | |
133 | | | | | | argument if necessary. | | |
134 | | | | v | | | |
135 | | | | --- |-------------------------------|<-- FRAME_LOCALS_ADDRESS | |
136 | | | | | | | |
137 | | | | | Locals and temporaries. | | |
138 | | | | | | | |
139 | | | | |-------------------------------| | |
140 | | | | | | | |
141 | |-fregoffset | Saved float registers. | | |
142 | | | | | F9 | | |
143 | | | | | . | | |
144 | | | | | . | | |
145 | | | | | F2 | | |
146 | | | v | | | |
147 | | | -------|-------------------------------| | |
148 | | | | | | |
149 | | | | Saved registers. | | |
150 | | | | S6 | | |
151 | |-regoffset | . | | |
152 | | | | . | | |
153 | | | | S0 | | |
154 | | | | pdr.pcreg | | |
155 | | v | | | |
156 | | ----------|-------------------------------| | |
157 | | | | | |
158 | frameoffset | Argument build area, gets | | |
159 | | | 7th ... nth arg for any | | |
160 | | | called procedure. | | |
161 | v | | | |
162 | -------------|-------------------------------|<-- sp | |
163 | | | | |
164 | */ | |
c5aa993b JM |
165 | /* *INDENT-ON* */ |
166 | ||
c5aa993b | 167 | #define PROC_LOW_ADDR(proc) ((proc)->pdr.adr) /* least address */ |
b83266a0 SS |
168 | /* These next two fields are kind of being hijacked. I wonder if |
169 | iline is too small for the values it needs to hold, if GDB is | |
170 | running on a 32-bit host. */ | |
c5aa993b JM |
171 | #define PROC_HIGH_ADDR(proc) ((proc)->pdr.iline) /* upper address bound */ |
172 | #define PROC_DUMMY_FRAME(proc) ((proc)->pdr.cbLineOffset) /*CALL_DUMMY frame */ | |
c906108c SS |
173 | #define PROC_FRAME_OFFSET(proc) ((proc)->pdr.frameoffset) |
174 | #define PROC_FRAME_REG(proc) ((proc)->pdr.framereg) | |
175 | #define PROC_REG_MASK(proc) ((proc)->pdr.regmask) | |
176 | #define PROC_FREG_MASK(proc) ((proc)->pdr.fregmask) | |
177 | #define PROC_REG_OFFSET(proc) ((proc)->pdr.regoffset) | |
178 | #define PROC_FREG_OFFSET(proc) ((proc)->pdr.fregoffset) | |
179 | #define PROC_PC_REG(proc) ((proc)->pdr.pcreg) | |
180 | #define PROC_LOCALOFF(proc) ((proc)->pdr.localoff) | |
181 | #define PROC_SYMBOL(proc) (*(struct symbol**)&(proc)->pdr.isym) | |
182 | #define _PROC_MAGIC_ 0x0F0F0F0F | |
183 | #define PROC_DESC_IS_DUMMY(proc) ((proc)->pdr.isym == _PROC_MAGIC_) | |
184 | #define SET_PROC_DESC_IS_DUMMY(proc) ((proc)->pdr.isym = _PROC_MAGIC_) | |
185 | ||
186 | struct linked_proc_info | |
c5aa993b JM |
187 | { |
188 | struct alpha_extra_func_info info; | |
189 | struct linked_proc_info *next; | |
190 | } | |
191 | *linked_proc_desc_table = NULL; | |
c906108c | 192 | \f |
36a6271d JT |
193 | static CORE_ADDR |
194 | alpha_frame_past_sigtramp_frame (struct frame_info *frame, CORE_ADDR pc) | |
c906108c | 195 | { |
36a6271d JT |
196 | struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); |
197 | ||
198 | if (tdep->skip_sigtramp_frame != NULL) | |
199 | return (tdep->skip_sigtramp_frame (frame, pc)); | |
200 | ||
201 | return (0); | |
202 | } | |
203 | ||
204 | static LONGEST | |
205 | alpha_dynamic_sigtramp_offset (CORE_ADDR pc) | |
206 | { | |
207 | struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); | |
208 | ||
209 | /* Must be provided by OS/ABI variant code if supported. */ | |
210 | if (tdep->dynamic_sigtramp_offset != NULL) | |
211 | return (tdep->dynamic_sigtramp_offset (pc)); | |
212 | ||
213 | return (-1); | |
214 | } | |
215 | ||
216 | #define ALPHA_PROC_SIGTRAMP_MAGIC 0x0e0f0f0f | |
217 | ||
218 | /* Return TRUE if the procedure descriptor PROC is a procedure | |
219 | descriptor that refers to a dynamically generated signal | |
220 | trampoline routine. */ | |
221 | static int | |
222 | alpha_proc_desc_is_dyn_sigtramp (struct alpha_extra_func_info *proc) | |
223 | { | |
224 | struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); | |
225 | ||
226 | if (tdep->dynamic_sigtramp_offset != NULL) | |
227 | return (proc->pdr.isym == ALPHA_PROC_SIGTRAMP_MAGIC); | |
228 | ||
229 | return (0); | |
230 | } | |
231 | ||
232 | static void | |
233 | alpha_set_proc_desc_is_dyn_sigtramp (struct alpha_extra_func_info *proc) | |
234 | { | |
235 | struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); | |
236 | ||
237 | if (tdep->dynamic_sigtramp_offset != NULL) | |
238 | proc->pdr.isym = ALPHA_PROC_SIGTRAMP_MAGIC; | |
c906108c | 239 | } |
c5aa993b | 240 | |
c906108c SS |
241 | /* Dynamically create a signal-handler caller procedure descriptor for |
242 | the signal-handler return code starting at address LOW_ADDR. The | |
243 | descriptor is added to the linked_proc_desc_table. */ | |
244 | ||
245 | static alpha_extra_func_info_t | |
fba45db2 | 246 | push_sigtramp_desc (CORE_ADDR low_addr) |
c906108c SS |
247 | { |
248 | struct linked_proc_info *link; | |
249 | alpha_extra_func_info_t proc_desc; | |
250 | ||
251 | link = (struct linked_proc_info *) | |
252 | xmalloc (sizeof (struct linked_proc_info)); | |
253 | link->next = linked_proc_desc_table; | |
254 | linked_proc_desc_table = link; | |
255 | ||
256 | proc_desc = &link->info; | |
257 | ||
258 | proc_desc->numargs = 0; | |
c5aa993b JM |
259 | PROC_LOW_ADDR (proc_desc) = low_addr; |
260 | PROC_HIGH_ADDR (proc_desc) = low_addr + 3 * 4; | |
261 | PROC_DUMMY_FRAME (proc_desc) = 0; | |
262 | PROC_FRAME_OFFSET (proc_desc) = 0x298; /* sizeof(struct sigcontext_struct) */ | |
263 | PROC_FRAME_REG (proc_desc) = SP_REGNUM; | |
264 | PROC_REG_MASK (proc_desc) = 0xffff; | |
265 | PROC_FREG_MASK (proc_desc) = 0xffff; | |
266 | PROC_PC_REG (proc_desc) = 26; | |
267 | PROC_LOCALOFF (proc_desc) = 0; | |
36a6271d | 268 | alpha_set_proc_desc_is_dyn_sigtramp (proc_desc); |
c906108c SS |
269 | return (proc_desc); |
270 | } | |
c906108c | 271 | \f |
c5aa993b | 272 | |
fa88f677 | 273 | static const char * |
636a6dfc JT |
274 | alpha_register_name (int regno) |
275 | { | |
276 | static char *register_names[] = | |
277 | { | |
278 | "v0", "t0", "t1", "t2", "t3", "t4", "t5", "t6", | |
279 | "t7", "s0", "s1", "s2", "s3", "s4", "s5", "fp", | |
280 | "a0", "a1", "a2", "a3", "a4", "a5", "t8", "t9", | |
281 | "t10", "t11", "ra", "t12", "at", "gp", "sp", "zero", | |
282 | "f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7", | |
283 | "f8", "f9", "f10", "f11", "f12", "f13", "f14", "f15", | |
284 | "f16", "f17", "f18", "f19", "f20", "f21", "f22", "f23", | |
285 | "f24", "f25", "f26", "f27", "f28", "f29", "f30", "fpcr", | |
87d1b352 | 286 | "pc", "vfp", "unique", |
636a6dfc JT |
287 | }; |
288 | ||
289 | if (regno < 0) | |
290 | return (NULL); | |
291 | if (regno >= (sizeof(register_names) / sizeof(*register_names))) | |
292 | return (NULL); | |
293 | return (register_names[regno]); | |
294 | } | |
d734c450 | 295 | |
dc129d82 | 296 | static int |
d734c450 JT |
297 | alpha_cannot_fetch_register (int regno) |
298 | { | |
dc129d82 | 299 | return (regno == FP_REGNUM || regno == ALPHA_ZERO_REGNUM); |
d734c450 JT |
300 | } |
301 | ||
dc129d82 | 302 | static int |
d734c450 JT |
303 | alpha_cannot_store_register (int regno) |
304 | { | |
dc129d82 | 305 | return (regno == FP_REGNUM || regno == ALPHA_ZERO_REGNUM); |
d734c450 JT |
306 | } |
307 | ||
dc129d82 | 308 | static int |
d734c450 JT |
309 | alpha_register_convertible (int regno) |
310 | { | |
311 | return (regno >= FP0_REGNUM && regno <= FP0_REGNUM + 31); | |
312 | } | |
0d056799 | 313 | |
dc129d82 | 314 | static struct type * |
0d056799 JT |
315 | alpha_register_virtual_type (int regno) |
316 | { | |
317 | return ((regno >= FP0_REGNUM && regno < (FP0_REGNUM+31)) | |
318 | ? builtin_type_double : builtin_type_long); | |
319 | } | |
f8453e34 | 320 | |
dc129d82 | 321 | static int |
f8453e34 JT |
322 | alpha_register_byte (int regno) |
323 | { | |
324 | return (regno * 8); | |
325 | } | |
326 | ||
dc129d82 | 327 | static int |
f8453e34 JT |
328 | alpha_register_raw_size (int regno) |
329 | { | |
330 | return 8; | |
331 | } | |
332 | ||
dc129d82 | 333 | static int |
f8453e34 JT |
334 | alpha_register_virtual_size (int regno) |
335 | { | |
336 | return 8; | |
337 | } | |
636a6dfc JT |
338 | \f |
339 | ||
5868c862 JT |
340 | static CORE_ADDR |
341 | alpha_sigcontext_addr (struct frame_info *fi) | |
342 | { | |
343 | struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); | |
344 | ||
345 | if (tdep->sigcontext_addr) | |
346 | return (tdep->sigcontext_addr (fi)); | |
347 | ||
348 | return (0); | |
349 | } | |
350 | ||
c906108c SS |
351 | /* Guaranteed to set frame->saved_regs to some values (it never leaves it |
352 | NULL). */ | |
353 | ||
140f9984 | 354 | static void |
fba45db2 | 355 | alpha_find_saved_regs (struct frame_info *frame) |
c906108c SS |
356 | { |
357 | int ireg; | |
358 | CORE_ADDR reg_position; | |
359 | unsigned long mask; | |
360 | alpha_extra_func_info_t proc_desc; | |
361 | int returnreg; | |
362 | ||
363 | frame_saved_regs_zalloc (frame); | |
364 | ||
365 | /* If it is the frame for __sigtramp, the saved registers are located | |
366 | in a sigcontext structure somewhere on the stack. __sigtramp | |
367 | passes a pointer to the sigcontext structure on the stack. | |
368 | If the stack layout for __sigtramp changes, or if sigcontext offsets | |
369 | change, we might have to update this code. */ | |
370 | #ifndef SIGFRAME_PC_OFF | |
371 | #define SIGFRAME_PC_OFF (2 * 8) | |
372 | #define SIGFRAME_REGSAVE_OFF (4 * 8) | |
373 | #define SIGFRAME_FPREGSAVE_OFF (SIGFRAME_REGSAVE_OFF + 32 * 8 + 8) | |
374 | #endif | |
5a203e44 | 375 | if ((get_frame_type (frame) == SIGTRAMP_FRAME)) |
c906108c SS |
376 | { |
377 | CORE_ADDR sigcontext_addr; | |
378 | ||
5868c862 JT |
379 | sigcontext_addr = alpha_sigcontext_addr (frame); |
380 | if (sigcontext_addr == 0) | |
381 | { | |
382 | /* Don't know where the sigcontext is; just bail. */ | |
383 | return; | |
384 | } | |
c906108c SS |
385 | for (ireg = 0; ireg < 32; ireg++) |
386 | { | |
c5aa993b | 387 | reg_position = sigcontext_addr + SIGFRAME_REGSAVE_OFF + ireg * 8; |
b2fb4676 | 388 | get_frame_saved_regs (frame)[ireg] = reg_position; |
c906108c SS |
389 | } |
390 | for (ireg = 0; ireg < 32; ireg++) | |
391 | { | |
c5aa993b | 392 | reg_position = sigcontext_addr + SIGFRAME_FPREGSAVE_OFF + ireg * 8; |
b2fb4676 | 393 | get_frame_saved_regs (frame)[FP0_REGNUM + ireg] = reg_position; |
c906108c | 394 | } |
b2fb4676 | 395 | get_frame_saved_regs (frame)[PC_REGNUM] = sigcontext_addr + SIGFRAME_PC_OFF; |
c906108c SS |
396 | return; |
397 | } | |
398 | ||
da50a4b7 | 399 | proc_desc = get_frame_extra_info (frame)->proc_desc; |
c906108c SS |
400 | if (proc_desc == NULL) |
401 | /* I'm not sure how/whether this can happen. Normally when we can't | |
402 | find a proc_desc, we "synthesize" one using heuristic_proc_desc | |
403 | and set the saved_regs right away. */ | |
404 | return; | |
405 | ||
406 | /* Fill in the offsets for the registers which gen_mask says | |
407 | were saved. */ | |
408 | ||
1e2330ba | 409 | reg_position = get_frame_base (frame) + PROC_REG_OFFSET (proc_desc); |
c906108c SS |
410 | mask = PROC_REG_MASK (proc_desc); |
411 | ||
412 | returnreg = PROC_PC_REG (proc_desc); | |
413 | ||
414 | /* Note that RA is always saved first, regardless of its actual | |
415 | register number. */ | |
416 | if (mask & (1 << returnreg)) | |
417 | { | |
b2fb4676 | 418 | get_frame_saved_regs (frame)[returnreg] = reg_position; |
c906108c | 419 | reg_position += 8; |
c5aa993b JM |
420 | mask &= ~(1 << returnreg); /* Clear bit for RA so we |
421 | don't save again later. */ | |
c906108c SS |
422 | } |
423 | ||
c5aa993b | 424 | for (ireg = 0; ireg <= 31; ++ireg) |
c906108c SS |
425 | if (mask & (1 << ireg)) |
426 | { | |
b2fb4676 | 427 | get_frame_saved_regs (frame)[ireg] = reg_position; |
c906108c SS |
428 | reg_position += 8; |
429 | } | |
430 | ||
431 | /* Fill in the offsets for the registers which float_mask says | |
432 | were saved. */ | |
433 | ||
1e2330ba | 434 | reg_position = get_frame_base (frame) + PROC_FREG_OFFSET (proc_desc); |
c906108c SS |
435 | mask = PROC_FREG_MASK (proc_desc); |
436 | ||
c5aa993b | 437 | for (ireg = 0; ireg <= 31; ++ireg) |
c906108c SS |
438 | if (mask & (1 << ireg)) |
439 | { | |
b2fb4676 | 440 | get_frame_saved_regs (frame)[FP0_REGNUM + ireg] = reg_position; |
c906108c SS |
441 | reg_position += 8; |
442 | } | |
443 | ||
b2fb4676 | 444 | get_frame_saved_regs (frame)[PC_REGNUM] = get_frame_saved_regs (frame)[returnreg]; |
c906108c SS |
445 | } |
446 | ||
dc129d82 | 447 | static void |
140f9984 JT |
448 | alpha_frame_init_saved_regs (struct frame_info *fi) |
449 | { | |
b2fb4676 | 450 | if (get_frame_saved_regs (fi) == NULL) |
140f9984 | 451 | alpha_find_saved_regs (fi); |
1e2330ba | 452 | get_frame_saved_regs (fi)[SP_REGNUM] = get_frame_base (fi); |
140f9984 JT |
453 | } |
454 | ||
97f46953 | 455 | static CORE_ADDR |
0d056799 JT |
456 | alpha_init_frame_pc_first (int fromleaf, struct frame_info *prev) |
457 | { | |
97f46953 | 458 | return (fromleaf ? SAVED_PC_AFTER_CALL (get_next_frame (prev)) |
8bedc050 | 459 | : get_next_frame (prev) ? DEPRECATED_FRAME_SAVED_PC (get_next_frame (prev)) |
97f46953 | 460 | : read_pc ()); |
0d056799 JT |
461 | } |
462 | ||
c906108c | 463 | static CORE_ADDR |
fba45db2 | 464 | read_next_frame_reg (struct frame_info *fi, int regno) |
c906108c | 465 | { |
11c02a10 | 466 | for (; fi; fi = get_next_frame (fi)) |
c906108c SS |
467 | { |
468 | /* We have to get the saved sp from the sigcontext | |
c5aa993b | 469 | if it is a signal handler frame. */ |
5a203e44 | 470 | if (regno == SP_REGNUM && !(get_frame_type (fi) == SIGTRAMP_FRAME)) |
1e2330ba | 471 | return get_frame_base (fi); |
c906108c SS |
472 | else |
473 | { | |
b2fb4676 | 474 | if (get_frame_saved_regs (fi) == NULL) |
c906108c | 475 | alpha_find_saved_regs (fi); |
b2fb4676 AC |
476 | if (get_frame_saved_regs (fi)[regno]) |
477 | return read_memory_integer (get_frame_saved_regs (fi)[regno], 8); | |
c906108c SS |
478 | } |
479 | } | |
c5aa993b | 480 | return read_register (regno); |
c906108c SS |
481 | } |
482 | ||
dc129d82 | 483 | static CORE_ADDR |
fba45db2 | 484 | alpha_frame_saved_pc (struct frame_info *frame) |
c906108c | 485 | { |
da50a4b7 | 486 | alpha_extra_func_info_t proc_desc = get_frame_extra_info (frame)->proc_desc; |
c906108c SS |
487 | /* We have to get the saved pc from the sigcontext |
488 | if it is a signal handler frame. */ | |
da50a4b7 AC |
489 | int pcreg = ((get_frame_type (frame) == SIGTRAMP_FRAME) |
490 | ? PC_REGNUM | |
491 | : get_frame_extra_info (frame)->pc_reg); | |
c906108c | 492 | |
c5aa993b | 493 | if (proc_desc && PROC_DESC_IS_DUMMY (proc_desc)) |
1e2330ba | 494 | return read_memory_integer (get_frame_base (frame) - 8, 8); |
c906108c | 495 | |
c5aa993b | 496 | return read_next_frame_reg (frame, pcreg); |
c906108c SS |
497 | } |
498 | ||
dc129d82 | 499 | static CORE_ADDR |
fba45db2 | 500 | alpha_saved_pc_after_call (struct frame_info *frame) |
c906108c | 501 | { |
50abf9e5 | 502 | CORE_ADDR pc = get_frame_pc (frame); |
c906108c SS |
503 | CORE_ADDR tmp; |
504 | alpha_extra_func_info_t proc_desc; | |
505 | int pcreg; | |
506 | ||
507 | /* Skip over shared library trampoline if necessary. */ | |
508 | tmp = SKIP_TRAMPOLINE_CODE (pc); | |
509 | if (tmp != 0) | |
510 | pc = tmp; | |
511 | ||
11c02a10 | 512 | proc_desc = find_proc_desc (pc, get_next_frame (frame)); |
dc129d82 | 513 | pcreg = proc_desc ? PROC_PC_REG (proc_desc) : ALPHA_RA_REGNUM; |
c906108c | 514 | |
5a203e44 | 515 | if ((get_frame_type (frame) == SIGTRAMP_FRAME)) |
c906108c SS |
516 | return alpha_frame_saved_pc (frame); |
517 | else | |
518 | return read_register (pcreg); | |
519 | } | |
520 | ||
521 | ||
522 | static struct alpha_extra_func_info temp_proc_desc; | |
dc129d82 | 523 | static CORE_ADDR temp_saved_regs[ALPHA_NUM_REGS]; |
c906108c SS |
524 | |
525 | /* Nonzero if instruction at PC is a return instruction. "ret | |
526 | $zero,($ra),1" on alpha. */ | |
527 | ||
528 | static int | |
fba45db2 | 529 | alpha_about_to_return (CORE_ADDR pc) |
c906108c SS |
530 | { |
531 | return read_memory_integer (pc, 4) == 0x6bfa8001; | |
532 | } | |
533 | ||
534 | ||
535 | ||
536 | /* This fencepost looks highly suspicious to me. Removing it also | |
537 | seems suspicious as it could affect remote debugging across serial | |
538 | lines. */ | |
539 | ||
540 | static CORE_ADDR | |
fba45db2 | 541 | heuristic_proc_start (CORE_ADDR pc) |
c906108c | 542 | { |
d9b023cc | 543 | struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); |
c5aa993b JM |
544 | CORE_ADDR start_pc = pc; |
545 | CORE_ADDR fence = start_pc - heuristic_fence_post; | |
c906108c | 546 | |
c5aa993b JM |
547 | if (start_pc == 0) |
548 | return 0; | |
c906108c | 549 | |
c5aa993b | 550 | if (heuristic_fence_post == UINT_MAX |
d9b023cc JT |
551 | || fence < tdep->vm_min_address) |
552 | fence = tdep->vm_min_address; | |
c906108c | 553 | |
c5aa993b JM |
554 | /* search back for previous return */ |
555 | for (start_pc -= 4;; start_pc -= 4) | |
556 | if (start_pc < fence) | |
557 | { | |
558 | /* It's not clear to me why we reach this point when | |
559 | stop_soon_quietly, but with this test, at least we | |
560 | don't print out warnings for every child forked (eg, on | |
561 | decstation). 22apr93 rich@cygnus.com. */ | |
562 | if (!stop_soon_quietly) | |
c906108c | 563 | { |
c5aa993b JM |
564 | static int blurb_printed = 0; |
565 | ||
d9b023cc | 566 | if (fence == tdep->vm_min_address) |
c5aa993b JM |
567 | warning ("Hit beginning of text section without finding"); |
568 | else | |
569 | warning ("Hit heuristic-fence-post without finding"); | |
570 | ||
d4f3574e | 571 | warning ("enclosing function for address 0x%s", paddr_nz (pc)); |
c5aa993b | 572 | if (!blurb_printed) |
c906108c | 573 | { |
c5aa993b | 574 | printf_filtered ("\ |
c906108c SS |
575 | This warning occurs if you are debugging a function without any symbols\n\ |
576 | (for example, in a stripped executable). In that case, you may wish to\n\ | |
577 | increase the size of the search with the `set heuristic-fence-post' command.\n\ | |
578 | \n\ | |
579 | Otherwise, you told GDB there was a function where there isn't one, or\n\ | |
580 | (more likely) you have encountered a bug in GDB.\n"); | |
c5aa993b | 581 | blurb_printed = 1; |
c906108c | 582 | } |
c906108c | 583 | } |
c906108c | 584 | |
c5aa993b JM |
585 | return 0; |
586 | } | |
587 | else if (alpha_about_to_return (start_pc)) | |
588 | break; | |
589 | ||
590 | start_pc += 4; /* skip return */ | |
591 | return start_pc; | |
c906108c SS |
592 | } |
593 | ||
594 | static alpha_extra_func_info_t | |
fba45db2 KB |
595 | heuristic_proc_desc (CORE_ADDR start_pc, CORE_ADDR limit_pc, |
596 | struct frame_info *next_frame) | |
c906108c | 597 | { |
c5aa993b | 598 | CORE_ADDR sp = read_next_frame_reg (next_frame, SP_REGNUM); |
dc1b0db2 | 599 | CORE_ADDR vfp = sp; |
c5aa993b JM |
600 | CORE_ADDR cur_pc; |
601 | int frame_size; | |
602 | int has_frame_reg = 0; | |
603 | unsigned long reg_mask = 0; | |
604 | int pcreg = -1; | |
dc1b0db2 | 605 | int regno; |
c5aa993b JM |
606 | |
607 | if (start_pc == 0) | |
608 | return NULL; | |
609 | memset (&temp_proc_desc, '\0', sizeof (temp_proc_desc)); | |
140f9984 | 610 | memset (&temp_saved_regs, '\0', SIZEOF_FRAME_SAVED_REGS); |
c5aa993b JM |
611 | PROC_LOW_ADDR (&temp_proc_desc) = start_pc; |
612 | ||
613 | if (start_pc + 200 < limit_pc) | |
614 | limit_pc = start_pc + 200; | |
615 | frame_size = 0; | |
616 | for (cur_pc = start_pc; cur_pc < limit_pc; cur_pc += 4) | |
617 | { | |
618 | char buf[4]; | |
619 | unsigned long word; | |
620 | int status; | |
c906108c | 621 | |
c5aa993b JM |
622 | status = read_memory_nobpt (cur_pc, buf, 4); |
623 | if (status) | |
624 | memory_error (status, cur_pc); | |
625 | word = extract_unsigned_integer (buf, 4); | |
c906108c | 626 | |
c5aa993b JM |
627 | if ((word & 0xffff0000) == 0x23de0000) /* lda $sp,n($sp) */ |
628 | { | |
629 | if (word & 0x8000) | |
dc1b0db2 JB |
630 | { |
631 | /* Consider only the first stack allocation instruction | |
632 | to contain the static size of the frame. */ | |
633 | if (frame_size == 0) | |
634 | frame_size += (-word) & 0xffff; | |
635 | } | |
c5aa993b JM |
636 | else |
637 | /* Exit loop if a positive stack adjustment is found, which | |
638 | usually means that the stack cleanup code in the function | |
639 | epilogue is reached. */ | |
640 | break; | |
641 | } | |
642 | else if ((word & 0xfc1f0000) == 0xb41e0000 /* stq reg,n($sp) */ | |
643 | && (word & 0xffff0000) != 0xb7fe0000) /* reg != $zero */ | |
644 | { | |
645 | int reg = (word & 0x03e00000) >> 21; | |
646 | reg_mask |= 1 << reg; | |
dc1b0db2 JB |
647 | |
648 | /* Do not compute the address where the register was saved yet, | |
649 | because we don't know yet if the offset will need to be | |
650 | relative to $sp or $fp (we can not compute the address relative | |
651 | to $sp if $sp is updated during the execution of the current | |
652 | subroutine, for instance when doing some alloca). So just store | |
653 | the offset for the moment, and compute the address later | |
654 | when we know whether this frame has a frame pointer or not. | |
655 | */ | |
656 | temp_saved_regs[reg] = (short) word; | |
c5aa993b JM |
657 | |
658 | /* Starting with OSF/1-3.2C, the system libraries are shipped | |
659 | without local symbols, but they still contain procedure | |
660 | descriptors without a symbol reference. GDB is currently | |
661 | unable to find these procedure descriptors and uses | |
662 | heuristic_proc_desc instead. | |
663 | As some low level compiler support routines (__div*, __add*) | |
664 | use a non-standard return address register, we have to | |
665 | add some heuristics to determine the return address register, | |
666 | or stepping over these routines will fail. | |
667 | Usually the return address register is the first register | |
668 | saved on the stack, but assembler optimization might | |
669 | rearrange the register saves. | |
670 | So we recognize only a few registers (t7, t9, ra) within | |
671 | the procedure prologue as valid return address registers. | |
672 | If we encounter a return instruction, we extract the | |
673 | the return address register from it. | |
674 | ||
675 | FIXME: Rewriting GDB to access the procedure descriptors, | |
676 | e.g. via the minimal symbol table, might obviate this hack. */ | |
677 | if (pcreg == -1 | |
678 | && cur_pc < (start_pc + 80) | |
dc129d82 JT |
679 | && (reg == ALPHA_T7_REGNUM || reg == ALPHA_T9_REGNUM |
680 | || reg == ALPHA_RA_REGNUM)) | |
c5aa993b JM |
681 | pcreg = reg; |
682 | } | |
683 | else if ((word & 0xffe0ffff) == 0x6be08001) /* ret zero,reg,1 */ | |
684 | pcreg = (word >> 16) & 0x1f; | |
dc1b0db2 JB |
685 | else if (word == 0x47de040f || word == 0x47fe040f) /* bis sp,sp fp */ |
686 | { | |
687 | /* ??? I am not sure what instruction is 0x47fe040f, and I | |
688 | am suspecting that there was a typo and should have been | |
689 | 0x47fe040f. I'm keeping it in the test above until further | |
690 | investigation */ | |
691 | has_frame_reg = 1; | |
692 | vfp = read_next_frame_reg (next_frame, ALPHA_GCC_FP_REGNUM); | |
693 | } | |
c5aa993b JM |
694 | } |
695 | if (pcreg == -1) | |
696 | { | |
697 | /* If we haven't found a valid return address register yet, | |
698 | keep searching in the procedure prologue. */ | |
699 | while (cur_pc < (limit_pc + 80) && cur_pc < (start_pc + 80)) | |
700 | { | |
701 | char buf[4]; | |
702 | unsigned long word; | |
c906108c | 703 | |
c5aa993b JM |
704 | if (read_memory_nobpt (cur_pc, buf, 4)) |
705 | break; | |
706 | cur_pc += 4; | |
707 | word = extract_unsigned_integer (buf, 4); | |
c906108c | 708 | |
c5aa993b JM |
709 | if ((word & 0xfc1f0000) == 0xb41e0000 /* stq reg,n($sp) */ |
710 | && (word & 0xffff0000) != 0xb7fe0000) /* reg != $zero */ | |
711 | { | |
712 | int reg = (word & 0x03e00000) >> 21; | |
dc129d82 JT |
713 | if (reg == ALPHA_T7_REGNUM || reg == ALPHA_T9_REGNUM |
714 | || reg == ALPHA_RA_REGNUM) | |
c5aa993b JM |
715 | { |
716 | pcreg = reg; | |
717 | break; | |
718 | } | |
719 | } | |
720 | else if ((word & 0xffe0ffff) == 0x6be08001) /* ret zero,reg,1 */ | |
721 | { | |
722 | pcreg = (word >> 16) & 0x1f; | |
723 | break; | |
724 | } | |
725 | } | |
726 | } | |
c906108c | 727 | |
c5aa993b | 728 | if (has_frame_reg) |
dc129d82 | 729 | PROC_FRAME_REG (&temp_proc_desc) = ALPHA_GCC_FP_REGNUM; |
c5aa993b JM |
730 | else |
731 | PROC_FRAME_REG (&temp_proc_desc) = SP_REGNUM; | |
dc1b0db2 JB |
732 | |
733 | /* At this point, we know which of the Stack Pointer or the Frame Pointer | |
734 | to use as the reference address to compute the saved registers address. | |
735 | But in both cases, the processing above has set vfp to this reference | |
736 | address, so just need to increment the offset of each saved register | |
737 | by this address. */ | |
738 | for (regno = 0; regno < NUM_REGS; regno++) | |
739 | { | |
740 | if (reg_mask & 1 << regno) | |
741 | temp_saved_regs[regno] += vfp; | |
742 | } | |
743 | ||
c5aa993b JM |
744 | PROC_FRAME_OFFSET (&temp_proc_desc) = frame_size; |
745 | PROC_REG_MASK (&temp_proc_desc) = reg_mask; | |
dc129d82 | 746 | PROC_PC_REG (&temp_proc_desc) = (pcreg == -1) ? ALPHA_RA_REGNUM : pcreg; |
c5aa993b JM |
747 | PROC_LOCALOFF (&temp_proc_desc) = 0; /* XXX - bogus */ |
748 | return &temp_proc_desc; | |
c906108c SS |
749 | } |
750 | ||
751 | /* This returns the PC of the first inst after the prologue. If we can't | |
752 | find the prologue, then return 0. */ | |
753 | ||
754 | static CORE_ADDR | |
fba45db2 | 755 | after_prologue (CORE_ADDR pc, alpha_extra_func_info_t proc_desc) |
c906108c SS |
756 | { |
757 | struct symtab_and_line sal; | |
758 | CORE_ADDR func_addr, func_end; | |
759 | ||
760 | if (!proc_desc) | |
761 | proc_desc = find_proc_desc (pc, NULL); | |
762 | ||
763 | if (proc_desc) | |
764 | { | |
36a6271d | 765 | if (alpha_proc_desc_is_dyn_sigtramp (proc_desc)) |
c906108c SS |
766 | return PROC_LOW_ADDR (proc_desc); /* "prologue" is in kernel */ |
767 | ||
768 | /* If function is frameless, then we need to do it the hard way. I | |
c5aa993b | 769 | strongly suspect that frameless always means prologueless... */ |
c906108c SS |
770 | if (PROC_FRAME_REG (proc_desc) == SP_REGNUM |
771 | && PROC_FRAME_OFFSET (proc_desc) == 0) | |
772 | return 0; | |
773 | } | |
774 | ||
775 | if (!find_pc_partial_function (pc, NULL, &func_addr, &func_end)) | |
776 | return 0; /* Unknown */ | |
777 | ||
778 | sal = find_pc_line (func_addr, 0); | |
779 | ||
780 | if (sal.end < func_end) | |
781 | return sal.end; | |
782 | ||
783 | /* The line after the prologue is after the end of the function. In this | |
784 | case, tell the caller to find the prologue the hard way. */ | |
785 | ||
786 | return 0; | |
787 | } | |
788 | ||
789 | /* Return non-zero if we *might* be in a function prologue. Return zero if we | |
790 | are definitively *not* in a function prologue. */ | |
791 | ||
792 | static int | |
fba45db2 | 793 | alpha_in_prologue (CORE_ADDR pc, alpha_extra_func_info_t proc_desc) |
c906108c SS |
794 | { |
795 | CORE_ADDR after_prologue_pc; | |
796 | ||
797 | after_prologue_pc = after_prologue (pc, proc_desc); | |
798 | ||
799 | if (after_prologue_pc == 0 | |
800 | || pc < after_prologue_pc) | |
801 | return 1; | |
802 | else | |
803 | return 0; | |
804 | } | |
805 | ||
806 | static alpha_extra_func_info_t | |
fba45db2 | 807 | find_proc_desc (CORE_ADDR pc, struct frame_info *next_frame) |
c906108c SS |
808 | { |
809 | alpha_extra_func_info_t proc_desc; | |
810 | struct block *b; | |
811 | struct symbol *sym; | |
812 | CORE_ADDR startaddr; | |
813 | ||
814 | /* Try to get the proc_desc from the linked call dummy proc_descs | |
815 | if the pc is in the call dummy. | |
816 | This is hairy. In the case of nested dummy calls we have to find the | |
817 | right proc_desc, but we might not yet know the frame for the dummy | |
818 | as it will be contained in the proc_desc we are searching for. | |
819 | So we have to find the proc_desc whose frame is closest to the current | |
820 | stack pointer. */ | |
821 | ||
ae45cd16 | 822 | if (DEPRECATED_PC_IN_CALL_DUMMY (pc, 0, 0)) |
c906108c SS |
823 | { |
824 | struct linked_proc_info *link; | |
825 | CORE_ADDR sp = read_next_frame_reg (next_frame, SP_REGNUM); | |
826 | alpha_extra_func_info_t found_proc_desc = NULL; | |
827 | long min_distance = LONG_MAX; | |
828 | ||
829 | for (link = linked_proc_desc_table; link; link = link->next) | |
830 | { | |
831 | long distance = (CORE_ADDR) PROC_DUMMY_FRAME (&link->info) - sp; | |
832 | if (distance > 0 && distance < min_distance) | |
833 | { | |
834 | min_distance = distance; | |
835 | found_proc_desc = &link->info; | |
836 | } | |
837 | } | |
838 | if (found_proc_desc != NULL) | |
839 | return found_proc_desc; | |
840 | } | |
841 | ||
c5aa993b | 842 | b = block_for_pc (pc); |
c906108c SS |
843 | |
844 | find_pc_partial_function (pc, NULL, &startaddr, NULL); | |
845 | if (b == NULL) | |
846 | sym = NULL; | |
847 | else | |
848 | { | |
849 | if (startaddr > BLOCK_START (b)) | |
850 | /* This is the "pathological" case referred to in a comment in | |
851 | print_frame_info. It might be better to move this check into | |
852 | symbol reading. */ | |
853 | sym = NULL; | |
854 | else | |
855 | sym = lookup_symbol (MIPS_EFI_SYMBOL_NAME, b, LABEL_NAMESPACE, | |
856 | 0, NULL); | |
857 | } | |
858 | ||
859 | /* If we never found a PDR for this function in symbol reading, then | |
860 | examine prologues to find the information. */ | |
861 | if (sym && ((mips_extra_func_info_t) SYMBOL_VALUE (sym))->pdr.framereg == -1) | |
862 | sym = NULL; | |
863 | ||
864 | if (sym) | |
865 | { | |
c5aa993b JM |
866 | /* IF this is the topmost frame AND |
867 | * (this proc does not have debugging information OR | |
868 | * the PC is in the procedure prologue) | |
869 | * THEN create a "heuristic" proc_desc (by analyzing | |
870 | * the actual code) to replace the "official" proc_desc. | |
871 | */ | |
872 | proc_desc = (alpha_extra_func_info_t) SYMBOL_VALUE (sym); | |
873 | if (next_frame == NULL) | |
874 | { | |
875 | if (PROC_DESC_IS_DUMMY (proc_desc) || alpha_in_prologue (pc, proc_desc)) | |
876 | { | |
877 | alpha_extra_func_info_t found_heuristic = | |
878 | heuristic_proc_desc (PROC_LOW_ADDR (proc_desc), | |
879 | pc, next_frame); | |
880 | if (found_heuristic) | |
881 | { | |
882 | PROC_LOCALOFF (found_heuristic) = | |
883 | PROC_LOCALOFF (proc_desc); | |
884 | PROC_PC_REG (found_heuristic) = PROC_PC_REG (proc_desc); | |
885 | proc_desc = found_heuristic; | |
886 | } | |
887 | } | |
888 | } | |
c906108c SS |
889 | } |
890 | else | |
891 | { | |
892 | long offset; | |
893 | ||
894 | /* Is linked_proc_desc_table really necessary? It only seems to be used | |
c5aa993b JM |
895 | by procedure call dummys. However, the procedures being called ought |
896 | to have their own proc_descs, and even if they don't, | |
897 | heuristic_proc_desc knows how to create them! */ | |
c906108c SS |
898 | |
899 | register struct linked_proc_info *link; | |
900 | for (link = linked_proc_desc_table; link; link = link->next) | |
c5aa993b JM |
901 | if (PROC_LOW_ADDR (&link->info) <= pc |
902 | && PROC_HIGH_ADDR (&link->info) > pc) | |
903 | return &link->info; | |
c906108c SS |
904 | |
905 | /* If PC is inside a dynamically generated sigtramp handler, | |
c5aa993b | 906 | create and push a procedure descriptor for that code: */ |
36a6271d | 907 | offset = alpha_dynamic_sigtramp_offset (pc); |
c906108c SS |
908 | if (offset >= 0) |
909 | return push_sigtramp_desc (pc - offset); | |
910 | ||
911 | /* If heuristic_fence_post is non-zero, determine the procedure | |
c5aa993b JM |
912 | start address by examining the instructions. |
913 | This allows us to find the start address of static functions which | |
914 | have no symbolic information, as startaddr would have been set to | |
915 | the preceding global function start address by the | |
916 | find_pc_partial_function call above. */ | |
c906108c SS |
917 | if (startaddr == 0 || heuristic_fence_post != 0) |
918 | startaddr = heuristic_proc_start (pc); | |
919 | ||
920 | proc_desc = | |
921 | heuristic_proc_desc (startaddr, pc, next_frame); | |
922 | } | |
923 | return proc_desc; | |
924 | } | |
925 | ||
926 | alpha_extra_func_info_t cached_proc_desc; | |
927 | ||
dc129d82 | 928 | static CORE_ADDR |
fba45db2 | 929 | alpha_frame_chain (struct frame_info *frame) |
c906108c | 930 | { |
c5aa993b | 931 | alpha_extra_func_info_t proc_desc; |
8bedc050 | 932 | CORE_ADDR saved_pc = DEPRECATED_FRAME_SAVED_PC (frame); |
c5aa993b JM |
933 | |
934 | if (saved_pc == 0 || inside_entry_file (saved_pc)) | |
935 | return 0; | |
936 | ||
937 | proc_desc = find_proc_desc (saved_pc, frame); | |
938 | if (!proc_desc) | |
939 | return 0; | |
940 | ||
941 | cached_proc_desc = proc_desc; | |
942 | ||
943 | /* Fetch the frame pointer for a dummy frame from the procedure | |
944 | descriptor. */ | |
945 | if (PROC_DESC_IS_DUMMY (proc_desc)) | |
946 | return (CORE_ADDR) PROC_DUMMY_FRAME (proc_desc); | |
947 | ||
948 | /* If no frame pointer and frame size is zero, we must be at end | |
949 | of stack (or otherwise hosed). If we don't check frame size, | |
950 | we loop forever if we see a zero size frame. */ | |
951 | if (PROC_FRAME_REG (proc_desc) == SP_REGNUM | |
952 | && PROC_FRAME_OFFSET (proc_desc) == 0 | |
953 | /* The previous frame from a sigtramp frame might be frameless | |
954 | and have frame size zero. */ | |
5a203e44 | 955 | && !(get_frame_type (frame) == SIGTRAMP_FRAME)) |
36a6271d | 956 | return alpha_frame_past_sigtramp_frame (frame, saved_pc); |
c5aa993b JM |
957 | else |
958 | return read_next_frame_reg (frame, PROC_FRAME_REG (proc_desc)) | |
959 | + PROC_FRAME_OFFSET (proc_desc); | |
c906108c SS |
960 | } |
961 | ||
962 | void | |
140f9984 JT |
963 | alpha_print_extra_frame_info (struct frame_info *fi) |
964 | { | |
965 | if (fi | |
da50a4b7 AC |
966 | && get_frame_extra_info (fi) |
967 | && get_frame_extra_info (fi)->proc_desc | |
968 | && get_frame_extra_info (fi)->proc_desc->pdr.framereg < NUM_REGS) | |
140f9984 | 969 | printf_filtered (" frame pointer is at %s+%s\n", |
da50a4b7 AC |
970 | REGISTER_NAME (get_frame_extra_info (fi)->proc_desc->pdr.framereg), |
971 | paddr_d (get_frame_extra_info (fi)->proc_desc->pdr.frameoffset)); | |
140f9984 JT |
972 | } |
973 | ||
dc129d82 | 974 | static void |
140f9984 | 975 | alpha_init_extra_frame_info (int fromleaf, struct frame_info *frame) |
c906108c SS |
976 | { |
977 | /* Use proc_desc calculated in frame_chain */ | |
978 | alpha_extra_func_info_t proc_desc = | |
11c02a10 AC |
979 | get_next_frame (frame) |
980 | ? cached_proc_desc | |
981 | : find_proc_desc (get_frame_pc (frame), get_next_frame (frame)); | |
c906108c | 982 | |
a00a19e9 | 983 | frame_extra_info_zalloc (frame, sizeof (struct frame_extra_info)); |
140f9984 | 984 | |
b2fb4676 AC |
985 | /* NOTE: cagney/2003-01-03: No need to set saved_regs to NULL, |
986 | always NULL by default. */ | |
987 | /* frame->saved_regs = NULL; */ | |
da50a4b7 AC |
988 | get_frame_extra_info (frame)->localoff = 0; |
989 | get_frame_extra_info (frame)->pc_reg = ALPHA_RA_REGNUM; | |
990 | get_frame_extra_info (frame)->proc_desc = proc_desc == &temp_proc_desc ? 0 : proc_desc; | |
c906108c SS |
991 | if (proc_desc) |
992 | { | |
993 | /* Get the locals offset and the saved pc register from the | |
c5aa993b JM |
994 | procedure descriptor, they are valid even if we are in the |
995 | middle of the prologue. */ | |
da50a4b7 AC |
996 | get_frame_extra_info (frame)->localoff = PROC_LOCALOFF (proc_desc); |
997 | get_frame_extra_info (frame)->pc_reg = PROC_PC_REG (proc_desc); | |
c906108c SS |
998 | |
999 | /* Fixup frame-pointer - only needed for top frame */ | |
1000 | ||
1001 | /* Fetch the frame pointer for a dummy frame from the procedure | |
c5aa993b JM |
1002 | descriptor. */ |
1003 | if (PROC_DESC_IS_DUMMY (proc_desc)) | |
8ccd593b | 1004 | deprecated_update_frame_base_hack (frame, (CORE_ADDR) PROC_DUMMY_FRAME (proc_desc)); |
c906108c SS |
1005 | |
1006 | /* This may not be quite right, if proc has a real frame register. | |
c5aa993b JM |
1007 | Get the value of the frame relative sp, procedure might have been |
1008 | interrupted by a signal at it's very start. */ | |
50abf9e5 | 1009 | else if (get_frame_pc (frame) == PROC_LOW_ADDR (proc_desc) |
36a6271d | 1010 | && !alpha_proc_desc_is_dyn_sigtramp (proc_desc)) |
11c02a10 | 1011 | deprecated_update_frame_base_hack (frame, read_next_frame_reg (get_next_frame (frame), SP_REGNUM)); |
c906108c | 1012 | else |
11c02a10 | 1013 | deprecated_update_frame_base_hack (frame, read_next_frame_reg (get_next_frame (frame), PROC_FRAME_REG (proc_desc)) |
8ccd593b | 1014 | + PROC_FRAME_OFFSET (proc_desc)); |
c906108c SS |
1015 | |
1016 | if (proc_desc == &temp_proc_desc) | |
1017 | { | |
1018 | char *name; | |
1019 | ||
1020 | /* Do not set the saved registers for a sigtramp frame, | |
5a203e44 AC |
1021 | alpha_find_saved_registers will do that for us. We can't |
1022 | use (get_frame_type (frame) == SIGTRAMP_FRAME), it is not | |
1023 | yet set. */ | |
1024 | /* FIXME: cagney/2002-11-18: This problem will go away once | |
1025 | frame.c:get_prev_frame() is modified to set the frame's | |
1026 | type before calling functions like this. */ | |
50abf9e5 | 1027 | find_pc_partial_function (get_frame_pc (frame), &name, |
c5aa993b | 1028 | (CORE_ADDR *) NULL, (CORE_ADDR *) NULL); |
50abf9e5 | 1029 | if (!PC_IN_SIGTRAMP (get_frame_pc (frame), name)) |
c906108c | 1030 | { |
b2fb4676 AC |
1031 | frame_saved_regs_zalloc (frame); |
1032 | memcpy (get_frame_saved_regs (frame), temp_saved_regs, | |
140f9984 | 1033 | SIZEOF_FRAME_SAVED_REGS); |
b2fb4676 AC |
1034 | get_frame_saved_regs (frame)[PC_REGNUM] |
1035 | = get_frame_saved_regs (frame)[ALPHA_RA_REGNUM]; | |
c906108c SS |
1036 | } |
1037 | } | |
1038 | } | |
1039 | } | |
1040 | ||
dc129d82 | 1041 | static CORE_ADDR |
140f9984 JT |
1042 | alpha_frame_locals_address (struct frame_info *fi) |
1043 | { | |
da50a4b7 | 1044 | return (get_frame_base (fi) - get_frame_extra_info (fi)->localoff); |
140f9984 JT |
1045 | } |
1046 | ||
dc129d82 | 1047 | static CORE_ADDR |
140f9984 JT |
1048 | alpha_frame_args_address (struct frame_info *fi) |
1049 | { | |
1e2330ba | 1050 | return (get_frame_base (fi) - (ALPHA_NUM_ARG_REGS * 8)); |
140f9984 JT |
1051 | } |
1052 | ||
c906108c SS |
1053 | /* ALPHA stack frames are almost impenetrable. When execution stops, |
1054 | we basically have to look at symbol information for the function | |
1055 | that we stopped in, which tells us *which* register (if any) is | |
1056 | the base of the frame pointer, and what offset from that register | |
1057 | the frame itself is at. | |
1058 | ||
1059 | This presents a problem when trying to examine a stack in memory | |
1060 | (that isn't executing at the moment), using the "frame" command. We | |
1061 | don't have a PC, nor do we have any registers except SP. | |
1062 | ||
1063 | This routine takes two arguments, SP and PC, and tries to make the | |
1064 | cached frames look as if these two arguments defined a frame on the | |
1065 | cache. This allows the rest of info frame to extract the important | |
1066 | arguments without difficulty. */ | |
1067 | ||
1068 | struct frame_info * | |
a57f9e49 | 1069 | alpha_setup_arbitrary_frame (int argc, CORE_ADDR *argv) |
c906108c SS |
1070 | { |
1071 | if (argc != 2) | |
1072 | error ("ALPHA frame specifications require two arguments: sp and pc"); | |
1073 | ||
1074 | return create_new_frame (argv[0], argv[1]); | |
1075 | } | |
1076 | ||
1077 | /* The alpha passes the first six arguments in the registers, the rest on | |
1078 | the stack. The register arguments are eventually transferred to the | |
1079 | argument transfer area immediately below the stack by the called function | |
1080 | anyway. So we `push' at least six arguments on the stack, `reload' the | |
1081 | argument registers and then adjust the stack pointer to point past the | |
1082 | sixth argument. This algorithm simplifies the passing of a large struct | |
1083 | which extends from the registers to the stack. | |
1084 | If the called function is returning a structure, the address of the | |
1085 | structure to be returned is passed as a hidden first argument. */ | |
1086 | ||
dc129d82 | 1087 | static CORE_ADDR |
ea7c478f | 1088 | alpha_push_arguments (int nargs, struct value **args, CORE_ADDR sp, |
fba45db2 | 1089 | int struct_return, CORE_ADDR struct_addr) |
c906108c | 1090 | { |
7a292a7a | 1091 | int i; |
c906108c SS |
1092 | int accumulate_size = struct_return ? 8 : 0; |
1093 | int arg_regs_size = ALPHA_NUM_ARG_REGS * 8; | |
c5aa993b JM |
1094 | struct alpha_arg |
1095 | { | |
1096 | char *contents; | |
1097 | int len; | |
1098 | int offset; | |
1099 | }; | |
c906108c | 1100 | struct alpha_arg *alpha_args = |
c5aa993b | 1101 | (struct alpha_arg *) alloca (nargs * sizeof (struct alpha_arg)); |
c906108c SS |
1102 | register struct alpha_arg *m_arg; |
1103 | char raw_buffer[sizeof (CORE_ADDR)]; | |
1104 | int required_arg_regs; | |
1105 | ||
1106 | for (i = 0, m_arg = alpha_args; i < nargs; i++, m_arg++) | |
1107 | { | |
ea7c478f | 1108 | struct value *arg = args[i]; |
c906108c SS |
1109 | struct type *arg_type = check_typedef (VALUE_TYPE (arg)); |
1110 | /* Cast argument to long if necessary as the compiler does it too. */ | |
1111 | switch (TYPE_CODE (arg_type)) | |
1112 | { | |
1113 | case TYPE_CODE_INT: | |
1114 | case TYPE_CODE_BOOL: | |
1115 | case TYPE_CODE_CHAR: | |
1116 | case TYPE_CODE_RANGE: | |
1117 | case TYPE_CODE_ENUM: | |
1118 | if (TYPE_LENGTH (arg_type) < TYPE_LENGTH (builtin_type_long)) | |
1119 | { | |
1120 | arg_type = builtin_type_long; | |
1121 | arg = value_cast (arg_type, arg); | |
1122 | } | |
1123 | break; | |
1124 | default: | |
1125 | break; | |
1126 | } | |
1127 | m_arg->len = TYPE_LENGTH (arg_type); | |
1128 | m_arg->offset = accumulate_size; | |
1129 | accumulate_size = (accumulate_size + m_arg->len + 7) & ~7; | |
c5aa993b | 1130 | m_arg->contents = VALUE_CONTENTS (arg); |
c906108c SS |
1131 | } |
1132 | ||
1133 | /* Determine required argument register loads, loading an argument register | |
1134 | is expensive as it uses three ptrace calls. */ | |
1135 | required_arg_regs = accumulate_size / 8; | |
1136 | if (required_arg_regs > ALPHA_NUM_ARG_REGS) | |
1137 | required_arg_regs = ALPHA_NUM_ARG_REGS; | |
1138 | ||
1139 | /* Make room for the arguments on the stack. */ | |
1140 | if (accumulate_size < arg_regs_size) | |
c5aa993b | 1141 | accumulate_size = arg_regs_size; |
c906108c SS |
1142 | sp -= accumulate_size; |
1143 | ||
1144 | /* Keep sp aligned to a multiple of 16 as the compiler does it too. */ | |
1145 | sp &= ~15; | |
1146 | ||
1147 | /* `Push' arguments on the stack. */ | |
c5aa993b JM |
1148 | for (i = nargs; m_arg--, --i >= 0;) |
1149 | write_memory (sp + m_arg->offset, m_arg->contents, m_arg->len); | |
c906108c SS |
1150 | if (struct_return) |
1151 | { | |
1152 | store_address (raw_buffer, sizeof (CORE_ADDR), struct_addr); | |
1153 | write_memory (sp, raw_buffer, sizeof (CORE_ADDR)); | |
1154 | } | |
1155 | ||
1156 | /* Load the argument registers. */ | |
1157 | for (i = 0; i < required_arg_regs; i++) | |
1158 | { | |
1159 | LONGEST val; | |
1160 | ||
1161 | val = read_memory_integer (sp + i * 8, 8); | |
dc129d82 JT |
1162 | write_register (ALPHA_A0_REGNUM + i, val); |
1163 | write_register (ALPHA_FPA0_REGNUM + i, val); | |
c906108c SS |
1164 | } |
1165 | ||
1166 | return sp + arg_regs_size; | |
1167 | } | |
1168 | ||
dc129d82 | 1169 | static void |
fba45db2 | 1170 | alpha_push_dummy_frame (void) |
c906108c SS |
1171 | { |
1172 | int ireg; | |
1173 | struct linked_proc_info *link; | |
1174 | alpha_extra_func_info_t proc_desc; | |
1175 | CORE_ADDR sp = read_register (SP_REGNUM); | |
1176 | CORE_ADDR save_address; | |
dc129d82 | 1177 | char raw_buffer[ALPHA_MAX_REGISTER_RAW_SIZE]; |
c906108c SS |
1178 | unsigned long mask; |
1179 | ||
c5aa993b | 1180 | link = (struct linked_proc_info *) xmalloc (sizeof (struct linked_proc_info)); |
c906108c SS |
1181 | link->next = linked_proc_desc_table; |
1182 | linked_proc_desc_table = link; | |
c5aa993b | 1183 | |
c906108c SS |
1184 | proc_desc = &link->info; |
1185 | ||
1186 | /* | |
1187 | * The registers we must save are all those not preserved across | |
1188 | * procedure calls. | |
1189 | * In addition, we must save the PC and RA. | |
1190 | * | |
1191 | * Dummy frame layout: | |
1192 | * (high memory) | |
c5aa993b | 1193 | * Saved PC |
c906108c SS |
1194 | * Saved F30 |
1195 | * ... | |
1196 | * Saved F0 | |
c5aa993b JM |
1197 | * Saved R29 |
1198 | * ... | |
1199 | * Saved R0 | |
1200 | * Saved R26 (RA) | |
1201 | * Parameter build area | |
c906108c SS |
1202 | * (low memory) |
1203 | */ | |
1204 | ||
1205 | /* MASK(i,j) == (1<<i) + (1<<(i+1)) + ... + (1<<j)). Assume i<=j<31. */ | |
1206 | #define MASK(i,j) ((((LONGEST)1 << ((j)+1)) - 1) ^ (((LONGEST)1 << (i)) - 1)) | |
1207 | #define GEN_REG_SAVE_MASK (MASK(0,8) | MASK(16,29)) | |
1208 | #define GEN_REG_SAVE_COUNT 24 | |
1209 | #define FLOAT_REG_SAVE_MASK (MASK(0,1) | MASK(10,30)) | |
1210 | #define FLOAT_REG_SAVE_COUNT 23 | |
1211 | /* The special register is the PC as we have no bit for it in the save masks. | |
1212 | alpha_frame_saved_pc knows where the pc is saved in a dummy frame. */ | |
1213 | #define SPECIAL_REG_SAVE_COUNT 1 | |
1214 | ||
c5aa993b JM |
1215 | PROC_REG_MASK (proc_desc) = GEN_REG_SAVE_MASK; |
1216 | PROC_FREG_MASK (proc_desc) = FLOAT_REG_SAVE_MASK; | |
c906108c SS |
1217 | /* PROC_REG_OFFSET is the offset from the dummy frame to the saved RA, |
1218 | but keep SP aligned to a multiple of 16. */ | |
c5aa993b JM |
1219 | PROC_REG_OFFSET (proc_desc) = |
1220 | -((8 * (SPECIAL_REG_SAVE_COUNT | |
c906108c SS |
1221 | + GEN_REG_SAVE_COUNT |
1222 | + FLOAT_REG_SAVE_COUNT) | |
c5aa993b JM |
1223 | + 15) & ~15); |
1224 | PROC_FREG_OFFSET (proc_desc) = | |
1225 | PROC_REG_OFFSET (proc_desc) + 8 * GEN_REG_SAVE_COUNT; | |
c906108c SS |
1226 | |
1227 | /* Save general registers. | |
1228 | The return address register is the first saved register, all other | |
1229 | registers follow in ascending order. | |
1230 | The PC is saved immediately below the SP. */ | |
c5aa993b | 1231 | save_address = sp + PROC_REG_OFFSET (proc_desc); |
dc129d82 | 1232 | store_address (raw_buffer, 8, read_register (ALPHA_RA_REGNUM)); |
c906108c SS |
1233 | write_memory (save_address, raw_buffer, 8); |
1234 | save_address += 8; | |
c5aa993b | 1235 | mask = PROC_REG_MASK (proc_desc) & 0xffffffffL; |
c906108c SS |
1236 | for (ireg = 0; mask; ireg++, mask >>= 1) |
1237 | if (mask & 1) | |
1238 | { | |
dc129d82 | 1239 | if (ireg == ALPHA_RA_REGNUM) |
c906108c SS |
1240 | continue; |
1241 | store_address (raw_buffer, 8, read_register (ireg)); | |
1242 | write_memory (save_address, raw_buffer, 8); | |
1243 | save_address += 8; | |
1244 | } | |
1245 | ||
1246 | store_address (raw_buffer, 8, read_register (PC_REGNUM)); | |
1247 | write_memory (sp - 8, raw_buffer, 8); | |
1248 | ||
1249 | /* Save floating point registers. */ | |
c5aa993b JM |
1250 | save_address = sp + PROC_FREG_OFFSET (proc_desc); |
1251 | mask = PROC_FREG_MASK (proc_desc) & 0xffffffffL; | |
c906108c SS |
1252 | for (ireg = 0; mask; ireg++, mask >>= 1) |
1253 | if (mask & 1) | |
1254 | { | |
1255 | store_address (raw_buffer, 8, read_register (ireg + FP0_REGNUM)); | |
1256 | write_memory (save_address, raw_buffer, 8); | |
1257 | save_address += 8; | |
1258 | } | |
1259 | ||
1260 | /* Set and save the frame address for the dummy. | |
1261 | This is tricky. The only registers that are suitable for a frame save | |
1262 | are those that are preserved across procedure calls (s0-s6). But if | |
1263 | a read system call is interrupted and then a dummy call is made | |
1264 | (see testsuite/gdb.t17/interrupt.exp) the dummy call hangs till the read | |
1265 | is satisfied. Then it returns with the s0-s6 registers set to the values | |
1266 | on entry to the read system call and our dummy frame pointer would be | |
1267 | destroyed. So we save the dummy frame in the proc_desc and handle the | |
1268 | retrieval of the frame pointer of a dummy specifically. The frame register | |
1269 | is set to the virtual frame (pseudo) register, it's value will always | |
1270 | be read as zero and will help us to catch any errors in the dummy frame | |
1271 | retrieval code. */ | |
c5aa993b JM |
1272 | PROC_DUMMY_FRAME (proc_desc) = sp; |
1273 | PROC_FRAME_REG (proc_desc) = FP_REGNUM; | |
1274 | PROC_FRAME_OFFSET (proc_desc) = 0; | |
1275 | sp += PROC_REG_OFFSET (proc_desc); | |
c906108c SS |
1276 | write_register (SP_REGNUM, sp); |
1277 | ||
c5aa993b JM |
1278 | PROC_LOW_ADDR (proc_desc) = CALL_DUMMY_ADDRESS (); |
1279 | PROC_HIGH_ADDR (proc_desc) = PROC_LOW_ADDR (proc_desc) + 4; | |
c906108c | 1280 | |
c5aa993b | 1281 | SET_PROC_DESC_IS_DUMMY (proc_desc); |
dc129d82 | 1282 | PROC_PC_REG (proc_desc) = ALPHA_RA_REGNUM; |
c906108c SS |
1283 | } |
1284 | ||
dc129d82 | 1285 | static void |
fba45db2 | 1286 | alpha_pop_frame (void) |
c906108c SS |
1287 | { |
1288 | register int regnum; | |
1289 | struct frame_info *frame = get_current_frame (); | |
1e2330ba | 1290 | CORE_ADDR new_sp = get_frame_base (frame); |
c906108c | 1291 | |
da50a4b7 | 1292 | alpha_extra_func_info_t proc_desc = get_frame_extra_info (frame)->proc_desc; |
c906108c | 1293 | |
9e0b60a8 JM |
1294 | /* we need proc_desc to know how to restore the registers; |
1295 | if it is NULL, construct (a temporary) one */ | |
1296 | if (proc_desc == NULL) | |
11c02a10 | 1297 | proc_desc = find_proc_desc (get_frame_pc (frame), get_next_frame (frame)); |
9e0b60a8 JM |
1298 | |
1299 | /* Question: should we copy this proc_desc and save it in | |
1300 | frame->proc_desc? If we do, who will free it? | |
1301 | For now, we don't save a copy... */ | |
1302 | ||
8bedc050 | 1303 | write_register (PC_REGNUM, DEPRECATED_FRAME_SAVED_PC (frame)); |
b2fb4676 | 1304 | if (get_frame_saved_regs (frame) == NULL) |
c906108c SS |
1305 | alpha_find_saved_regs (frame); |
1306 | if (proc_desc) | |
1307 | { | |
c5aa993b JM |
1308 | for (regnum = 32; --regnum >= 0;) |
1309 | if (PROC_REG_MASK (proc_desc) & (1 << regnum)) | |
c906108c | 1310 | write_register (regnum, |
b2fb4676 | 1311 | read_memory_integer (get_frame_saved_regs (frame)[regnum], |
c906108c | 1312 | 8)); |
c5aa993b JM |
1313 | for (regnum = 32; --regnum >= 0;) |
1314 | if (PROC_FREG_MASK (proc_desc) & (1 << regnum)) | |
c906108c | 1315 | write_register (regnum + FP0_REGNUM, |
b2fb4676 | 1316 | read_memory_integer (get_frame_saved_regs (frame)[regnum + FP0_REGNUM], 8)); |
c906108c SS |
1317 | } |
1318 | write_register (SP_REGNUM, new_sp); | |
1319 | flush_cached_frames (); | |
1320 | ||
c5aa993b | 1321 | if (proc_desc && (PROC_DESC_IS_DUMMY (proc_desc) |
36a6271d | 1322 | || alpha_proc_desc_is_dyn_sigtramp (proc_desc))) |
c906108c SS |
1323 | { |
1324 | struct linked_proc_info *pi_ptr, *prev_ptr; | |
1325 | ||
1326 | for (pi_ptr = linked_proc_desc_table, prev_ptr = NULL; | |
1327 | pi_ptr != NULL; | |
1328 | prev_ptr = pi_ptr, pi_ptr = pi_ptr->next) | |
1329 | { | |
1330 | if (&pi_ptr->info == proc_desc) | |
1331 | break; | |
1332 | } | |
1333 | ||
1334 | if (pi_ptr == NULL) | |
1335 | error ("Can't locate dummy extra frame info\n"); | |
1336 | ||
1337 | if (prev_ptr != NULL) | |
1338 | prev_ptr->next = pi_ptr->next; | |
1339 | else | |
1340 | linked_proc_desc_table = pi_ptr->next; | |
1341 | ||
b8c9b27d | 1342 | xfree (pi_ptr); |
c906108c SS |
1343 | } |
1344 | } | |
1345 | \f | |
1346 | /* To skip prologues, I use this predicate. Returns either PC itself | |
1347 | if the code at PC does not look like a function prologue; otherwise | |
1348 | returns an address that (if we're lucky) follows the prologue. If | |
1349 | LENIENT, then we must skip everything which is involved in setting | |
1350 | up the frame (it's OK to skip more, just so long as we don't skip | |
1351 | anything which might clobber the registers which are being saved. | |
0fb34c3a MS |
1352 | Currently we must not skip more on the alpha, but we might need the |
1353 | lenient stuff some day. */ | |
c906108c | 1354 | |
f8453e34 JT |
1355 | static CORE_ADDR |
1356 | alpha_skip_prologue_internal (CORE_ADDR pc, int lenient) | |
c906108c | 1357 | { |
c5aa993b JM |
1358 | unsigned long inst; |
1359 | int offset; | |
1360 | CORE_ADDR post_prologue_pc; | |
1361 | char buf[4]; | |
c906108c | 1362 | |
c5aa993b JM |
1363 | /* Silently return the unaltered pc upon memory errors. |
1364 | This could happen on OSF/1 if decode_line_1 tries to skip the | |
1365 | prologue for quickstarted shared library functions when the | |
1366 | shared library is not yet mapped in. | |
1367 | Reading target memory is slow over serial lines, so we perform | |
15d72a92 JT |
1368 | this check only if the target has shared libraries (which all |
1369 | Alpha targets do). */ | |
c5aa993b JM |
1370 | if (target_read_memory (pc, buf, 4)) |
1371 | return pc; | |
c906108c | 1372 | |
c5aa993b JM |
1373 | /* See if we can determine the end of the prologue via the symbol table. |
1374 | If so, then return either PC, or the PC after the prologue, whichever | |
1375 | is greater. */ | |
c906108c | 1376 | |
c5aa993b | 1377 | post_prologue_pc = after_prologue (pc, NULL); |
c906108c | 1378 | |
c5aa993b JM |
1379 | if (post_prologue_pc != 0) |
1380 | return max (pc, post_prologue_pc); | |
c906108c | 1381 | |
c5aa993b JM |
1382 | /* Can't determine prologue from the symbol table, need to examine |
1383 | instructions. */ | |
c906108c | 1384 | |
c5aa993b JM |
1385 | /* Skip the typical prologue instructions. These are the stack adjustment |
1386 | instruction and the instructions that save registers on the stack | |
1387 | or in the gcc frame. */ | |
1388 | for (offset = 0; offset < 100; offset += 4) | |
1389 | { | |
1390 | int status; | |
1391 | ||
1392 | status = read_memory_nobpt (pc + offset, buf, 4); | |
1393 | if (status) | |
1394 | memory_error (status, pc + offset); | |
1395 | inst = extract_unsigned_integer (buf, 4); | |
1396 | ||
1397 | /* The alpha has no delay slots. But let's keep the lenient stuff, | |
1398 | we might need it for something else in the future. */ | |
1399 | if (lenient && 0) | |
1400 | continue; | |
1401 | ||
1402 | if ((inst & 0xffff0000) == 0x27bb0000) /* ldah $gp,n($t12) */ | |
1403 | continue; | |
1404 | if ((inst & 0xffff0000) == 0x23bd0000) /* lda $gp,n($gp) */ | |
1405 | continue; | |
1406 | if ((inst & 0xffff0000) == 0x23de0000) /* lda $sp,n($sp) */ | |
1407 | continue; | |
1408 | if ((inst & 0xffe01fff) == 0x43c0153e) /* subq $sp,n,$sp */ | |
1409 | continue; | |
1410 | ||
1411 | if ((inst & 0xfc1f0000) == 0xb41e0000 | |
1412 | && (inst & 0xffff0000) != 0xb7fe0000) | |
1413 | continue; /* stq reg,n($sp) */ | |
1414 | /* reg != $zero */ | |
1415 | if ((inst & 0xfc1f0000) == 0x9c1e0000 | |
1416 | && (inst & 0xffff0000) != 0x9ffe0000) | |
1417 | continue; /* stt reg,n($sp) */ | |
1418 | /* reg != $zero */ | |
1419 | if (inst == 0x47de040f) /* bis sp,sp,fp */ | |
1420 | continue; | |
1421 | ||
1422 | break; | |
c906108c | 1423 | } |
c5aa993b | 1424 | return pc + offset; |
c906108c SS |
1425 | } |
1426 | ||
dc129d82 | 1427 | static CORE_ADDR |
f8453e34 JT |
1428 | alpha_skip_prologue (CORE_ADDR addr) |
1429 | { | |
1430 | return (alpha_skip_prologue_internal (addr, 0)); | |
1431 | } | |
1432 | ||
c906108c SS |
1433 | #if 0 |
1434 | /* Is address PC in the prologue (loosely defined) for function at | |
1435 | STARTADDR? */ | |
1436 | ||
1437 | static int | |
fba45db2 | 1438 | alpha_in_lenient_prologue (CORE_ADDR startaddr, CORE_ADDR pc) |
c906108c | 1439 | { |
f8453e34 | 1440 | CORE_ADDR end_prologue = alpha_skip_prologue_internal (startaddr, 1); |
c906108c SS |
1441 | return pc >= startaddr && pc < end_prologue; |
1442 | } | |
1443 | #endif | |
1444 | ||
1445 | /* The alpha needs a conversion between register and memory format if | |
1446 | the register is a floating point register and | |
c5aa993b | 1447 | memory format is float, as the register format must be double |
c906108c | 1448 | or |
c5aa993b JM |
1449 | memory format is an integer with 4 bytes or less, as the representation |
1450 | of integers in floating point registers is different. */ | |
dc129d82 | 1451 | static void |
fba45db2 KB |
1452 | alpha_register_convert_to_virtual (int regnum, struct type *valtype, |
1453 | char *raw_buffer, char *virtual_buffer) | |
c906108c SS |
1454 | { |
1455 | if (TYPE_LENGTH (valtype) >= REGISTER_RAW_SIZE (regnum)) | |
1456 | { | |
1457 | memcpy (virtual_buffer, raw_buffer, REGISTER_VIRTUAL_SIZE (regnum)); | |
1458 | return; | |
1459 | } | |
1460 | ||
1461 | if (TYPE_CODE (valtype) == TYPE_CODE_FLT) | |
1462 | { | |
1463 | double d = extract_floating (raw_buffer, REGISTER_RAW_SIZE (regnum)); | |
1464 | store_floating (virtual_buffer, TYPE_LENGTH (valtype), d); | |
1465 | } | |
1466 | else if (TYPE_CODE (valtype) == TYPE_CODE_INT && TYPE_LENGTH (valtype) <= 4) | |
1467 | { | |
1468 | ULONGEST l; | |
1469 | l = extract_unsigned_integer (raw_buffer, REGISTER_RAW_SIZE (regnum)); | |
1470 | l = ((l >> 32) & 0xc0000000) | ((l >> 29) & 0x3fffffff); | |
1471 | store_unsigned_integer (virtual_buffer, TYPE_LENGTH (valtype), l); | |
1472 | } | |
1473 | else | |
1474 | error ("Cannot retrieve value from floating point register"); | |
1475 | } | |
1476 | ||
dc129d82 | 1477 | static void |
fba45db2 KB |
1478 | alpha_register_convert_to_raw (struct type *valtype, int regnum, |
1479 | char *virtual_buffer, char *raw_buffer) | |
c906108c SS |
1480 | { |
1481 | if (TYPE_LENGTH (valtype) >= REGISTER_RAW_SIZE (regnum)) | |
1482 | { | |
1483 | memcpy (raw_buffer, virtual_buffer, REGISTER_RAW_SIZE (regnum)); | |
1484 | return; | |
1485 | } | |
1486 | ||
1487 | if (TYPE_CODE (valtype) == TYPE_CODE_FLT) | |
1488 | { | |
1489 | double d = extract_floating (virtual_buffer, TYPE_LENGTH (valtype)); | |
1490 | store_floating (raw_buffer, REGISTER_RAW_SIZE (regnum), d); | |
1491 | } | |
1492 | else if (TYPE_CODE (valtype) == TYPE_CODE_INT && TYPE_LENGTH (valtype) <= 4) | |
1493 | { | |
1494 | ULONGEST l; | |
1495 | if (TYPE_UNSIGNED (valtype)) | |
1496 | l = extract_unsigned_integer (virtual_buffer, TYPE_LENGTH (valtype)); | |
1497 | else | |
1498 | l = extract_signed_integer (virtual_buffer, TYPE_LENGTH (valtype)); | |
1499 | l = ((l & 0xc0000000) << 32) | ((l & 0x3fffffff) << 29); | |
1500 | store_unsigned_integer (raw_buffer, REGISTER_RAW_SIZE (regnum), l); | |
1501 | } | |
1502 | else | |
1503 | error ("Cannot store value in floating point register"); | |
1504 | } | |
1505 | ||
95b80706 JT |
1506 | static const unsigned char * |
1507 | alpha_breakpoint_from_pc (CORE_ADDR *pcptr, int *lenptr) | |
1508 | { | |
1509 | static const unsigned char alpha_breakpoint[] = | |
1510 | { 0x80, 0, 0, 0 }; /* call_pal bpt */ | |
1511 | ||
1512 | *lenptr = sizeof(alpha_breakpoint); | |
1513 | return (alpha_breakpoint); | |
1514 | } | |
1515 | ||
c906108c SS |
1516 | /* Given a return value in `regbuf' with a type `valtype', |
1517 | extract and copy its value into `valbuf'. */ | |
1518 | ||
dc129d82 | 1519 | static void |
732a6b2d | 1520 | alpha_extract_return_value (struct type *valtype, |
997b20b8 | 1521 | char regbuf[ALPHA_REGISTER_BYTES], char *valbuf) |
c906108c SS |
1522 | { |
1523 | if (TYPE_CODE (valtype) == TYPE_CODE_FLT) | |
1524 | alpha_register_convert_to_virtual (FP0_REGNUM, valtype, | |
1525 | regbuf + REGISTER_BYTE (FP0_REGNUM), | |
1526 | valbuf); | |
1527 | else | |
dc129d82 JT |
1528 | memcpy (valbuf, regbuf + REGISTER_BYTE (ALPHA_V0_REGNUM), |
1529 | TYPE_LENGTH (valtype)); | |
c906108c SS |
1530 | } |
1531 | ||
1532 | /* Given a return value in `regbuf' with a type `valtype', | |
1533 | write its value into the appropriate register. */ | |
1534 | ||
dc129d82 | 1535 | static void |
fba45db2 | 1536 | alpha_store_return_value (struct type *valtype, char *valbuf) |
c906108c | 1537 | { |
dc129d82 JT |
1538 | char raw_buffer[ALPHA_MAX_REGISTER_RAW_SIZE]; |
1539 | int regnum = ALPHA_V0_REGNUM; | |
c906108c | 1540 | int length = TYPE_LENGTH (valtype); |
c5aa993b | 1541 | |
c906108c SS |
1542 | if (TYPE_CODE (valtype) == TYPE_CODE_FLT) |
1543 | { | |
1544 | regnum = FP0_REGNUM; | |
1545 | length = REGISTER_RAW_SIZE (regnum); | |
1546 | alpha_register_convert_to_raw (valtype, regnum, valbuf, raw_buffer); | |
1547 | } | |
1548 | else | |
1549 | memcpy (raw_buffer, valbuf, length); | |
1550 | ||
73937e03 | 1551 | deprecated_write_register_bytes (REGISTER_BYTE (regnum), raw_buffer, length); |
c906108c SS |
1552 | } |
1553 | ||
1554 | /* Just like reinit_frame_cache, but with the right arguments to be | |
1555 | callable as an sfunc. */ | |
1556 | ||
1557 | static void | |
fba45db2 | 1558 | reinit_frame_cache_sfunc (char *args, int from_tty, struct cmd_list_element *c) |
c906108c SS |
1559 | { |
1560 | reinit_frame_cache (); | |
1561 | } | |
1562 | ||
1563 | /* This is the definition of CALL_DUMMY_ADDRESS. It's a heuristic that is used | |
1564 | to find a convenient place in the text segment to stick a breakpoint to | |
1565 | detect the completion of a target function call (ala call_function_by_hand). | |
1566 | */ | |
1567 | ||
1568 | CORE_ADDR | |
fba45db2 | 1569 | alpha_call_dummy_address (void) |
c906108c SS |
1570 | { |
1571 | CORE_ADDR entry; | |
1572 | struct minimal_symbol *sym; | |
1573 | ||
1574 | entry = entry_point_address (); | |
1575 | ||
1576 | if (entry != 0) | |
1577 | return entry; | |
1578 | ||
1579 | sym = lookup_minimal_symbol ("_Prelude", NULL, symfile_objfile); | |
1580 | ||
1581 | if (!sym || MSYMBOL_TYPE (sym) != mst_text) | |
1582 | return 0; | |
1583 | else | |
1584 | return SYMBOL_VALUE_ADDRESS (sym) + 4; | |
ec32e4be JT |
1585 | } |
1586 | ||
dc129d82 | 1587 | static void |
0d056799 JT |
1588 | alpha_fix_call_dummy (char *dummy, CORE_ADDR pc, CORE_ADDR fun, int nargs, |
1589 | struct value **args, struct type *type, int gcc_p) | |
1590 | { | |
1591 | CORE_ADDR bp_address = CALL_DUMMY_ADDRESS (); | |
1592 | ||
1593 | if (bp_address == 0) | |
1594 | error ("no place to put call"); | |
dc129d82 JT |
1595 | write_register (ALPHA_RA_REGNUM, bp_address); |
1596 | write_register (ALPHA_T12_REGNUM, fun); | |
0d056799 JT |
1597 | } |
1598 | ||
ee1f65f0 JT |
1599 | /* On the Alpha, the call dummy code is nevery copied to user space |
1600 | (see alpha_fix_call_dummy() above). The contents of this do not | |
1601 | matter. */ | |
1602 | LONGEST alpha_call_dummy_words[] = { 0 }; | |
1603 | ||
dc129d82 | 1604 | static int |
d734c450 JT |
1605 | alpha_use_struct_convention (int gcc_p, struct type *type) |
1606 | { | |
1607 | /* Structures are returned by ref in extra arg0. */ | |
1608 | return 1; | |
1609 | } | |
1610 | ||
dc129d82 | 1611 | static void |
0d056799 JT |
1612 | alpha_store_struct_return (CORE_ADDR addr, CORE_ADDR sp) |
1613 | { | |
1614 | /* Store the address of the place in which to copy the structure the | |
1615 | subroutine will return. Handled by alpha_push_arguments. */ | |
1616 | } | |
1617 | ||
dc129d82 | 1618 | static CORE_ADDR |
0d056799 JT |
1619 | alpha_extract_struct_value_address (char *regbuf) |
1620 | { | |
dc129d82 JT |
1621 | return (extract_address (regbuf + REGISTER_BYTE (ALPHA_V0_REGNUM), |
1622 | REGISTER_RAW_SIZE (ALPHA_V0_REGNUM))); | |
0d056799 JT |
1623 | } |
1624 | ||
accc6d1f JT |
1625 | /* Figure out where the longjmp will land. |
1626 | We expect the first arg to be a pointer to the jmp_buf structure from | |
1627 | which we extract the PC (JB_PC) that we will land at. The PC is copied | |
1628 | into the "pc". This routine returns true on success. */ | |
1629 | ||
1630 | static int | |
1631 | alpha_get_longjmp_target (CORE_ADDR *pc) | |
1632 | { | |
1633 | struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); | |
1634 | CORE_ADDR jb_addr; | |
1635 | char raw_buffer[ALPHA_MAX_REGISTER_RAW_SIZE]; | |
1636 | ||
1637 | jb_addr = read_register (ALPHA_A0_REGNUM); | |
1638 | ||
1639 | if (target_read_memory (jb_addr + (tdep->jb_pc * tdep->jb_elt_size), | |
1640 | raw_buffer, tdep->jb_elt_size)) | |
1641 | return 0; | |
1642 | ||
1643 | *pc = extract_address (raw_buffer, tdep->jb_elt_size); | |
1644 | return 1; | |
1645 | } | |
1646 | ||
ec32e4be JT |
1647 | /* alpha_software_single_step() is called just before we want to resume |
1648 | the inferior, if we want to single-step it but there is no hardware | |
1649 | or kernel single-step support (NetBSD on Alpha, for example). We find | |
1650 | the target of the coming instruction and breakpoint it. | |
1651 | ||
1652 | single_step is also called just after the inferior stops. If we had | |
1653 | set up a simulated single-step, we undo our damage. */ | |
1654 | ||
1655 | static CORE_ADDR | |
1656 | alpha_next_pc (CORE_ADDR pc) | |
1657 | { | |
1658 | unsigned int insn; | |
1659 | unsigned int op; | |
1660 | int offset; | |
1661 | LONGEST rav; | |
1662 | ||
1663 | insn = read_memory_unsigned_integer (pc, sizeof (insn)); | |
1664 | ||
1665 | /* Opcode is top 6 bits. */ | |
1666 | op = (insn >> 26) & 0x3f; | |
1667 | ||
1668 | if (op == 0x1a) | |
1669 | { | |
1670 | /* Jump format: target PC is: | |
1671 | RB & ~3 */ | |
1672 | return (read_register ((insn >> 16) & 0x1f) & ~3); | |
1673 | } | |
1674 | ||
1675 | if ((op & 0x30) == 0x30) | |
1676 | { | |
1677 | /* Branch format: target PC is: | |
1678 | (new PC) + (4 * sext(displacement)) */ | |
1679 | if (op == 0x30 || /* BR */ | |
1680 | op == 0x34) /* BSR */ | |
1681 | { | |
1682 | branch_taken: | |
1683 | offset = (insn & 0x001fffff); | |
1684 | if (offset & 0x00100000) | |
1685 | offset |= 0xffe00000; | |
1686 | offset *= 4; | |
1687 | return (pc + 4 + offset); | |
1688 | } | |
1689 | ||
1690 | /* Need to determine if branch is taken; read RA. */ | |
1691 | rav = (LONGEST) read_register ((insn >> 21) & 0x1f); | |
1692 | switch (op) | |
1693 | { | |
1694 | case 0x38: /* BLBC */ | |
1695 | if ((rav & 1) == 0) | |
1696 | goto branch_taken; | |
1697 | break; | |
1698 | case 0x3c: /* BLBS */ | |
1699 | if (rav & 1) | |
1700 | goto branch_taken; | |
1701 | break; | |
1702 | case 0x39: /* BEQ */ | |
1703 | if (rav == 0) | |
1704 | goto branch_taken; | |
1705 | break; | |
1706 | case 0x3d: /* BNE */ | |
1707 | if (rav != 0) | |
1708 | goto branch_taken; | |
1709 | break; | |
1710 | case 0x3a: /* BLT */ | |
1711 | if (rav < 0) | |
1712 | goto branch_taken; | |
1713 | break; | |
1714 | case 0x3b: /* BLE */ | |
1715 | if (rav <= 0) | |
1716 | goto branch_taken; | |
1717 | break; | |
1718 | case 0x3f: /* BGT */ | |
1719 | if (rav > 0) | |
1720 | goto branch_taken; | |
1721 | break; | |
1722 | case 0x3e: /* BGE */ | |
1723 | if (rav >= 0) | |
1724 | goto branch_taken; | |
1725 | break; | |
1726 | } | |
1727 | } | |
1728 | ||
1729 | /* Not a branch or branch not taken; target PC is: | |
1730 | pc + 4 */ | |
1731 | return (pc + 4); | |
1732 | } | |
1733 | ||
1734 | void | |
1735 | alpha_software_single_step (enum target_signal sig, int insert_breakpoints_p) | |
1736 | { | |
1737 | static CORE_ADDR next_pc; | |
1738 | typedef char binsn_quantum[BREAKPOINT_MAX]; | |
1739 | static binsn_quantum break_mem; | |
1740 | CORE_ADDR pc; | |
1741 | ||
1742 | if (insert_breakpoints_p) | |
1743 | { | |
1744 | pc = read_pc (); | |
1745 | next_pc = alpha_next_pc (pc); | |
1746 | ||
1747 | target_insert_breakpoint (next_pc, break_mem); | |
1748 | } | |
1749 | else | |
1750 | { | |
1751 | target_remove_breakpoint (next_pc, break_mem); | |
1752 | write_pc (next_pc); | |
1753 | } | |
c906108c SS |
1754 | } |
1755 | ||
dc129d82 | 1756 | \f |
44dffaac | 1757 | |
dc129d82 JT |
1758 | /* Initialize the current architecture based on INFO. If possible, re-use an |
1759 | architecture from ARCHES, which is a list of architectures already created | |
1760 | during this debugging session. | |
1761 | ||
1762 | Called e.g. at program startup, when reading a core file, and when reading | |
1763 | a binary file. */ | |
1764 | ||
1765 | static struct gdbarch * | |
1766 | alpha_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches) | |
1767 | { | |
1768 | struct gdbarch_tdep *tdep; | |
1769 | struct gdbarch *gdbarch; | |
dc129d82 JT |
1770 | |
1771 | /* Try to determine the ABI of the object we are loading. */ | |
4be87837 | 1772 | if (info.abfd != NULL && info.osabi == GDB_OSABI_UNKNOWN) |
dc129d82 | 1773 | { |
4be87837 DJ |
1774 | /* If it's an ECOFF file, assume it's OSF/1. */ |
1775 | if (bfd_get_flavour (info.abfd) == bfd_target_ecoff_flavour) | |
aff87235 | 1776 | info.osabi = GDB_OSABI_OSF1; |
dc129d82 JT |
1777 | } |
1778 | ||
1779 | /* Find a candidate among extant architectures. */ | |
4be87837 DJ |
1780 | arches = gdbarch_list_lookup_by_info (arches, &info); |
1781 | if (arches != NULL) | |
1782 | return arches->gdbarch; | |
dc129d82 JT |
1783 | |
1784 | tdep = xmalloc (sizeof (struct gdbarch_tdep)); | |
1785 | gdbarch = gdbarch_alloc (&info, tdep); | |
1786 | ||
d9b023cc JT |
1787 | /* Lowest text address. This is used by heuristic_proc_start() to |
1788 | decide when to stop looking. */ | |
1789 | tdep->vm_min_address = (CORE_ADDR) 0x120000000; | |
1790 | ||
36a6271d JT |
1791 | tdep->dynamic_sigtramp_offset = NULL; |
1792 | tdep->skip_sigtramp_frame = NULL; | |
5868c862 | 1793 | tdep->sigcontext_addr = NULL; |
36a6271d | 1794 | |
accc6d1f JT |
1795 | tdep->jb_pc = -1; /* longjmp support not enabled by default */ |
1796 | ||
dc129d82 JT |
1797 | /* Type sizes */ |
1798 | set_gdbarch_short_bit (gdbarch, 16); | |
1799 | set_gdbarch_int_bit (gdbarch, 32); | |
1800 | set_gdbarch_long_bit (gdbarch, 64); | |
1801 | set_gdbarch_long_long_bit (gdbarch, 64); | |
1802 | set_gdbarch_float_bit (gdbarch, 32); | |
1803 | set_gdbarch_double_bit (gdbarch, 64); | |
1804 | set_gdbarch_long_double_bit (gdbarch, 64); | |
1805 | set_gdbarch_ptr_bit (gdbarch, 64); | |
1806 | ||
1807 | /* Register info */ | |
1808 | set_gdbarch_num_regs (gdbarch, ALPHA_NUM_REGS); | |
1809 | set_gdbarch_sp_regnum (gdbarch, ALPHA_SP_REGNUM); | |
1810 | set_gdbarch_fp_regnum (gdbarch, ALPHA_FP_REGNUM); | |
1811 | set_gdbarch_pc_regnum (gdbarch, ALPHA_PC_REGNUM); | |
1812 | set_gdbarch_fp0_regnum (gdbarch, ALPHA_FP0_REGNUM); | |
1813 | ||
1814 | set_gdbarch_register_name (gdbarch, alpha_register_name); | |
1815 | set_gdbarch_register_size (gdbarch, ALPHA_REGISTER_SIZE); | |
1816 | set_gdbarch_register_bytes (gdbarch, ALPHA_REGISTER_BYTES); | |
1817 | set_gdbarch_register_byte (gdbarch, alpha_register_byte); | |
1818 | set_gdbarch_register_raw_size (gdbarch, alpha_register_raw_size); | |
a0ed5532 | 1819 | set_gdbarch_deprecated_max_register_raw_size (gdbarch, ALPHA_MAX_REGISTER_RAW_SIZE); |
dc129d82 | 1820 | set_gdbarch_register_virtual_size (gdbarch, alpha_register_virtual_size); |
a0ed5532 | 1821 | set_gdbarch_deprecated_max_register_virtual_size (gdbarch, |
dc129d82 JT |
1822 | ALPHA_MAX_REGISTER_VIRTUAL_SIZE); |
1823 | set_gdbarch_register_virtual_type (gdbarch, alpha_register_virtual_type); | |
1824 | ||
1825 | set_gdbarch_cannot_fetch_register (gdbarch, alpha_cannot_fetch_register); | |
1826 | set_gdbarch_cannot_store_register (gdbarch, alpha_cannot_store_register); | |
1827 | ||
1828 | set_gdbarch_register_convertible (gdbarch, alpha_register_convertible); | |
1829 | set_gdbarch_register_convert_to_virtual (gdbarch, | |
1830 | alpha_register_convert_to_virtual); | |
1831 | set_gdbarch_register_convert_to_raw (gdbarch, alpha_register_convert_to_raw); | |
1832 | ||
1833 | set_gdbarch_skip_prologue (gdbarch, alpha_skip_prologue); | |
1834 | ||
1835 | set_gdbarch_frame_num_args (gdbarch, frame_num_args_unknown); | |
1836 | set_gdbarch_frameless_function_invocation (gdbarch, | |
1837 | generic_frameless_function_invocation_not); | |
1838 | ||
1839 | set_gdbarch_saved_pc_after_call (gdbarch, alpha_saved_pc_after_call); | |
1840 | ||
618ce49f | 1841 | set_gdbarch_deprecated_frame_chain (gdbarch, alpha_frame_chain); |
8bedc050 | 1842 | set_gdbarch_deprecated_frame_saved_pc (gdbarch, alpha_frame_saved_pc); |
dc129d82 | 1843 | |
f30ee0bc | 1844 | set_gdbarch_deprecated_frame_init_saved_regs (gdbarch, alpha_frame_init_saved_regs); |
dc129d82 JT |
1845 | |
1846 | set_gdbarch_use_struct_convention (gdbarch, alpha_use_struct_convention); | |
26e9b323 | 1847 | set_gdbarch_deprecated_extract_return_value (gdbarch, alpha_extract_return_value); |
dc129d82 JT |
1848 | |
1849 | set_gdbarch_store_struct_return (gdbarch, alpha_store_struct_return); | |
ebba8386 | 1850 | set_gdbarch_deprecated_store_return_value (gdbarch, alpha_store_return_value); |
26e9b323 | 1851 | set_gdbarch_deprecated_extract_struct_value_address (gdbarch, |
dc129d82 JT |
1852 | alpha_extract_struct_value_address); |
1853 | ||
1854 | /* Settings for calling functions in the inferior. */ | |
07555a72 | 1855 | set_gdbarch_deprecated_use_generic_dummy_frames (gdbarch, 0); |
dc129d82 JT |
1856 | set_gdbarch_call_dummy_length (gdbarch, 0); |
1857 | set_gdbarch_push_arguments (gdbarch, alpha_push_arguments); | |
749b82f6 | 1858 | set_gdbarch_deprecated_pop_frame (gdbarch, alpha_pop_frame); |
dc129d82 JT |
1859 | |
1860 | /* On the Alpha, the call dummy code is never copied to user space, | |
1861 | stopping the user call is achieved via a bp_call_dummy breakpoint. | |
1862 | But we need a fake CALL_DUMMY definition to enable the proper | |
1863 | call_function_by_hand and to avoid zero length array warnings. */ | |
1864 | set_gdbarch_call_dummy_p (gdbarch, 1); | |
1865 | set_gdbarch_call_dummy_words (gdbarch, alpha_call_dummy_words); | |
1866 | set_gdbarch_sizeof_call_dummy_words (gdbarch, 0); | |
1867 | set_gdbarch_frame_args_address (gdbarch, alpha_frame_args_address); | |
1868 | set_gdbarch_frame_locals_address (gdbarch, alpha_frame_locals_address); | |
e9582e71 | 1869 | set_gdbarch_deprecated_init_extra_frame_info (gdbarch, alpha_init_extra_frame_info); |
dc129d82 JT |
1870 | |
1871 | /* Alpha OSF/1 inhibits execution of code on the stack. But there is | |
1872 | no need for a dummy on the Alpha. PUSH_ARGUMENTS takes care of all | |
1873 | argument handling and bp_call_dummy takes care of stopping the dummy. */ | |
dc129d82 JT |
1874 | set_gdbarch_call_dummy_address (gdbarch, alpha_call_dummy_address); |
1875 | set_gdbarch_call_dummy_breakpoint_offset_p (gdbarch, 1); | |
1876 | set_gdbarch_call_dummy_breakpoint_offset (gdbarch, 0); | |
1877 | set_gdbarch_call_dummy_start_offset (gdbarch, 0); | |
ae45cd16 | 1878 | set_gdbarch_deprecated_pc_in_call_dummy (gdbarch, deprecated_pc_in_call_dummy_at_entry_point); |
dc129d82 | 1879 | set_gdbarch_call_dummy_stack_adjust_p (gdbarch, 0); |
f3824013 | 1880 | set_gdbarch_deprecated_push_dummy_frame (gdbarch, alpha_push_dummy_frame); |
dc129d82 | 1881 | set_gdbarch_fix_call_dummy (gdbarch, alpha_fix_call_dummy); |
a5afb99f | 1882 | set_gdbarch_deprecated_init_frame_pc (gdbarch, init_frame_pc_noop); |
2ca6c561 | 1883 | set_gdbarch_deprecated_init_frame_pc_first (gdbarch, alpha_init_frame_pc_first); |
dc129d82 JT |
1884 | |
1885 | set_gdbarch_inner_than (gdbarch, core_addr_lessthan); | |
36a6271d | 1886 | set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target); |
dc129d82 | 1887 | |
95b80706 | 1888 | set_gdbarch_breakpoint_from_pc (gdbarch, alpha_breakpoint_from_pc); |
dc129d82 | 1889 | set_gdbarch_decr_pc_after_break (gdbarch, 4); |
95b80706 JT |
1890 | |
1891 | set_gdbarch_function_start_offset (gdbarch, 0); | |
dc129d82 JT |
1892 | set_gdbarch_frame_args_skip (gdbarch, 0); |
1893 | ||
44dffaac | 1894 | /* Hook in ABI-specific overrides, if they have been registered. */ |
4be87837 | 1895 | gdbarch_init_osabi (info, gdbarch); |
44dffaac | 1896 | |
accc6d1f JT |
1897 | /* Now that we have tuned the configuration, set a few final things |
1898 | based on what the OS ABI has told us. */ | |
1899 | ||
1900 | if (tdep->jb_pc >= 0) | |
1901 | set_gdbarch_get_longjmp_target (gdbarch, alpha_get_longjmp_target); | |
1902 | ||
dc129d82 JT |
1903 | return gdbarch; |
1904 | } | |
1905 | ||
1906 | static void | |
1907 | alpha_dump_tdep (struct gdbarch *current_gdbarch, struct ui_file *file) | |
1908 | { | |
1909 | struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); | |
1910 | ||
1911 | if (tdep == NULL) | |
1912 | return; | |
1913 | ||
d9b023cc JT |
1914 | fprintf_unfiltered (file, |
1915 | "alpha_dump_tdep: vm_min_address = 0x%lx\n", | |
1916 | (long) tdep->vm_min_address); | |
accc6d1f JT |
1917 | |
1918 | fprintf_unfiltered (file, | |
1919 | "alpha_dump_tdep: jb_pc = %d\n", | |
1920 | tdep->jb_pc); | |
1921 | fprintf_unfiltered (file, | |
1922 | "alpha_dump_tdep: jb_elt_size = %ld\n", | |
1923 | (long) tdep->jb_elt_size); | |
dc129d82 JT |
1924 | } |
1925 | ||
c906108c | 1926 | void |
fba45db2 | 1927 | _initialize_alpha_tdep (void) |
c906108c SS |
1928 | { |
1929 | struct cmd_list_element *c; | |
1930 | ||
dc129d82 JT |
1931 | gdbarch_register (bfd_arch_alpha, alpha_gdbarch_init, alpha_dump_tdep); |
1932 | ||
c906108c SS |
1933 | tm_print_insn = print_insn_alpha; |
1934 | ||
1935 | /* Let the user set the fence post for heuristic_proc_start. */ | |
1936 | ||
1937 | /* We really would like to have both "0" and "unlimited" work, but | |
1938 | command.c doesn't deal with that. So make it a var_zinteger | |
1939 | because the user can always use "999999" or some such for unlimited. */ | |
1940 | c = add_set_cmd ("heuristic-fence-post", class_support, var_zinteger, | |
1941 | (char *) &heuristic_fence_post, | |
1942 | "\ | |
1943 | Set the distance searched for the start of a function.\n\ | |
1944 | If you are debugging a stripped executable, GDB needs to search through the\n\ | |
1945 | program for the start of a function. This command sets the distance of the\n\ | |
1946 | search. The only need to set it is when debugging a stripped executable.", | |
1947 | &setlist); | |
1948 | /* We need to throw away the frame cache when we set this, since it | |
1949 | might change our ability to get backtraces. */ | |
9f60d481 | 1950 | set_cmd_sfunc (c, reinit_frame_cache_sfunc); |
c906108c SS |
1951 | add_show_from_set (c, &showlist); |
1952 | } |