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; | |
26e9b323 | 57 | static gdbarch_deprecated_extract_return_value_ftype alpha_extract_return_value; |
26e9b323 | 58 | static gdbarch_deprecated_extract_struct_value_address_ftype |
dc129d82 JT |
59 | alpha_extract_struct_value_address; |
60 | static gdbarch_use_struct_convention_ftype alpha_use_struct_convention; | |
61 | ||
95b80706 JT |
62 | static gdbarch_breakpoint_from_pc_ftype alpha_breakpoint_from_pc; |
63 | ||
dc129d82 JT |
64 | static gdbarch_frame_args_address_ftype alpha_frame_args_address; |
65 | static gdbarch_frame_locals_address_ftype alpha_frame_locals_address; | |
66 | ||
67 | static gdbarch_skip_prologue_ftype alpha_skip_prologue; | |
dc129d82 | 68 | |
dc129d82 | 69 | static gdbarch_fix_call_dummy_ftype alpha_fix_call_dummy; |
c906108c | 70 | |
accc6d1f JT |
71 | static gdbarch_get_longjmp_target_ftype alpha_get_longjmp_target; |
72 | ||
140f9984 JT |
73 | struct frame_extra_info |
74 | { | |
75 | alpha_extra_func_info_t proc_desc; | |
76 | int localoff; | |
77 | int pc_reg; | |
78 | }; | |
79 | ||
c906108c SS |
80 | /* FIXME: Some of this code should perhaps be merged with mips-tdep.c. */ |
81 | ||
82 | /* Prototypes for local functions. */ | |
83 | ||
140f9984 JT |
84 | static void alpha_find_saved_regs (struct frame_info *); |
85 | ||
a14ed312 | 86 | static alpha_extra_func_info_t push_sigtramp_desc (CORE_ADDR low_addr); |
c906108c | 87 | |
a14ed312 | 88 | static CORE_ADDR read_next_frame_reg (struct frame_info *, int); |
c906108c | 89 | |
a14ed312 | 90 | static CORE_ADDR heuristic_proc_start (CORE_ADDR); |
c906108c | 91 | |
a14ed312 KB |
92 | static alpha_extra_func_info_t heuristic_proc_desc (CORE_ADDR, |
93 | CORE_ADDR, | |
94 | struct frame_info *); | |
c906108c | 95 | |
a14ed312 KB |
96 | static alpha_extra_func_info_t find_proc_desc (CORE_ADDR, |
97 | struct frame_info *); | |
c906108c SS |
98 | |
99 | #if 0 | |
a14ed312 | 100 | static int alpha_in_lenient_prologue (CORE_ADDR, CORE_ADDR); |
c906108c SS |
101 | #endif |
102 | ||
a14ed312 | 103 | static void reinit_frame_cache_sfunc (char *, int, struct cmd_list_element *); |
c906108c | 104 | |
a14ed312 KB |
105 | static CORE_ADDR after_prologue (CORE_ADDR pc, |
106 | alpha_extra_func_info_t proc_desc); | |
c906108c | 107 | |
a14ed312 KB |
108 | static int alpha_in_prologue (CORE_ADDR pc, |
109 | alpha_extra_func_info_t proc_desc); | |
c906108c | 110 | |
a14ed312 | 111 | static int alpha_about_to_return (CORE_ADDR pc); |
392a587b | 112 | |
a14ed312 | 113 | void _initialize_alpha_tdep (void); |
392a587b | 114 | |
c906108c SS |
115 | /* Heuristic_proc_start may hunt through the text section for a long |
116 | time across a 2400 baud serial line. Allows the user to limit this | |
117 | search. */ | |
118 | static unsigned int heuristic_fence_post = 0; | |
c5aa993b | 119 | /* *INDENT-OFF* */ |
c906108c SS |
120 | /* Layout of a stack frame on the alpha: |
121 | ||
122 | | | | |
123 | pdr members: | 7th ... nth arg, | | |
124 | | `pushed' by caller. | | |
125 | | | | |
126 | ----------------|-------------------------------|<-- old_sp == vfp | |
127 | ^ ^ ^ ^ | | | |
128 | | | | | | | | |
129 | | |localoff | Copies of 1st .. 6th | | |
130 | | | | | | argument if necessary. | | |
131 | | | | v | | | |
132 | | | | --- |-------------------------------|<-- FRAME_LOCALS_ADDRESS | |
133 | | | | | | | |
134 | | | | | Locals and temporaries. | | |
135 | | | | | | | |
136 | | | | |-------------------------------| | |
137 | | | | | | | |
138 | |-fregoffset | Saved float registers. | | |
139 | | | | | F9 | | |
140 | | | | | . | | |
141 | | | | | . | | |
142 | | | | | F2 | | |
143 | | | v | | | |
144 | | | -------|-------------------------------| | |
145 | | | | | | |
146 | | | | Saved registers. | | |
147 | | | | S6 | | |
148 | |-regoffset | . | | |
149 | | | | . | | |
150 | | | | S0 | | |
151 | | | | pdr.pcreg | | |
152 | | v | | | |
153 | | ----------|-------------------------------| | |
154 | | | | | |
155 | frameoffset | Argument build area, gets | | |
156 | | | 7th ... nth arg for any | | |
157 | | | called procedure. | | |
158 | v | | | |
159 | -------------|-------------------------------|<-- sp | |
160 | | | | |
161 | */ | |
c5aa993b JM |
162 | /* *INDENT-ON* */ |
163 | ||
c5aa993b | 164 | #define PROC_LOW_ADDR(proc) ((proc)->pdr.adr) /* least address */ |
b83266a0 SS |
165 | /* These next two fields are kind of being hijacked. I wonder if |
166 | iline is too small for the values it needs to hold, if GDB is | |
167 | running on a 32-bit host. */ | |
c5aa993b JM |
168 | #define PROC_HIGH_ADDR(proc) ((proc)->pdr.iline) /* upper address bound */ |
169 | #define PROC_DUMMY_FRAME(proc) ((proc)->pdr.cbLineOffset) /*CALL_DUMMY frame */ | |
c906108c SS |
170 | #define PROC_FRAME_OFFSET(proc) ((proc)->pdr.frameoffset) |
171 | #define PROC_FRAME_REG(proc) ((proc)->pdr.framereg) | |
172 | #define PROC_REG_MASK(proc) ((proc)->pdr.regmask) | |
173 | #define PROC_FREG_MASK(proc) ((proc)->pdr.fregmask) | |
174 | #define PROC_REG_OFFSET(proc) ((proc)->pdr.regoffset) | |
175 | #define PROC_FREG_OFFSET(proc) ((proc)->pdr.fregoffset) | |
176 | #define PROC_PC_REG(proc) ((proc)->pdr.pcreg) | |
177 | #define PROC_LOCALOFF(proc) ((proc)->pdr.localoff) | |
178 | #define PROC_SYMBOL(proc) (*(struct symbol**)&(proc)->pdr.isym) | |
179 | #define _PROC_MAGIC_ 0x0F0F0F0F | |
180 | #define PROC_DESC_IS_DUMMY(proc) ((proc)->pdr.isym == _PROC_MAGIC_) | |
181 | #define SET_PROC_DESC_IS_DUMMY(proc) ((proc)->pdr.isym = _PROC_MAGIC_) | |
182 | ||
183 | struct linked_proc_info | |
c5aa993b JM |
184 | { |
185 | struct alpha_extra_func_info info; | |
186 | struct linked_proc_info *next; | |
187 | } | |
188 | *linked_proc_desc_table = NULL; | |
c906108c | 189 | \f |
36a6271d JT |
190 | static CORE_ADDR |
191 | alpha_frame_past_sigtramp_frame (struct frame_info *frame, CORE_ADDR pc) | |
c906108c | 192 | { |
36a6271d JT |
193 | struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); |
194 | ||
195 | if (tdep->skip_sigtramp_frame != NULL) | |
196 | return (tdep->skip_sigtramp_frame (frame, pc)); | |
197 | ||
198 | return (0); | |
199 | } | |
200 | ||
201 | static LONGEST | |
202 | alpha_dynamic_sigtramp_offset (CORE_ADDR pc) | |
203 | { | |
204 | struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); | |
205 | ||
206 | /* Must be provided by OS/ABI variant code if supported. */ | |
207 | if (tdep->dynamic_sigtramp_offset != NULL) | |
208 | return (tdep->dynamic_sigtramp_offset (pc)); | |
209 | ||
210 | return (-1); | |
211 | } | |
212 | ||
213 | #define ALPHA_PROC_SIGTRAMP_MAGIC 0x0e0f0f0f | |
214 | ||
215 | /* Return TRUE if the procedure descriptor PROC is a procedure | |
216 | descriptor that refers to a dynamically generated signal | |
217 | trampoline routine. */ | |
218 | static int | |
219 | alpha_proc_desc_is_dyn_sigtramp (struct alpha_extra_func_info *proc) | |
220 | { | |
221 | struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); | |
222 | ||
223 | if (tdep->dynamic_sigtramp_offset != NULL) | |
224 | return (proc->pdr.isym == ALPHA_PROC_SIGTRAMP_MAGIC); | |
225 | ||
226 | return (0); | |
227 | } | |
228 | ||
229 | static void | |
230 | alpha_set_proc_desc_is_dyn_sigtramp (struct alpha_extra_func_info *proc) | |
231 | { | |
232 | struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); | |
233 | ||
234 | if (tdep->dynamic_sigtramp_offset != NULL) | |
235 | proc->pdr.isym = ALPHA_PROC_SIGTRAMP_MAGIC; | |
c906108c | 236 | } |
c5aa993b | 237 | |
c906108c SS |
238 | /* Dynamically create a signal-handler caller procedure descriptor for |
239 | the signal-handler return code starting at address LOW_ADDR. The | |
240 | descriptor is added to the linked_proc_desc_table. */ | |
241 | ||
242 | static alpha_extra_func_info_t | |
fba45db2 | 243 | push_sigtramp_desc (CORE_ADDR low_addr) |
c906108c SS |
244 | { |
245 | struct linked_proc_info *link; | |
246 | alpha_extra_func_info_t proc_desc; | |
247 | ||
248 | link = (struct linked_proc_info *) | |
249 | xmalloc (sizeof (struct linked_proc_info)); | |
250 | link->next = linked_proc_desc_table; | |
251 | linked_proc_desc_table = link; | |
252 | ||
253 | proc_desc = &link->info; | |
254 | ||
255 | proc_desc->numargs = 0; | |
c5aa993b JM |
256 | PROC_LOW_ADDR (proc_desc) = low_addr; |
257 | PROC_HIGH_ADDR (proc_desc) = low_addr + 3 * 4; | |
258 | PROC_DUMMY_FRAME (proc_desc) = 0; | |
259 | PROC_FRAME_OFFSET (proc_desc) = 0x298; /* sizeof(struct sigcontext_struct) */ | |
260 | PROC_FRAME_REG (proc_desc) = SP_REGNUM; | |
261 | PROC_REG_MASK (proc_desc) = 0xffff; | |
262 | PROC_FREG_MASK (proc_desc) = 0xffff; | |
263 | PROC_PC_REG (proc_desc) = 26; | |
264 | PROC_LOCALOFF (proc_desc) = 0; | |
36a6271d | 265 | alpha_set_proc_desc_is_dyn_sigtramp (proc_desc); |
c906108c SS |
266 | return (proc_desc); |
267 | } | |
c906108c | 268 | \f |
c5aa993b | 269 | |
fa88f677 | 270 | static const char * |
636a6dfc JT |
271 | alpha_register_name (int regno) |
272 | { | |
273 | static char *register_names[] = | |
274 | { | |
275 | "v0", "t0", "t1", "t2", "t3", "t4", "t5", "t6", | |
276 | "t7", "s0", "s1", "s2", "s3", "s4", "s5", "fp", | |
277 | "a0", "a1", "a2", "a3", "a4", "a5", "t8", "t9", | |
278 | "t10", "t11", "ra", "t12", "at", "gp", "sp", "zero", | |
279 | "f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7", | |
280 | "f8", "f9", "f10", "f11", "f12", "f13", "f14", "f15", | |
281 | "f16", "f17", "f18", "f19", "f20", "f21", "f22", "f23", | |
282 | "f24", "f25", "f26", "f27", "f28", "f29", "f30", "fpcr", | |
87d1b352 | 283 | "pc", "vfp", "unique", |
636a6dfc JT |
284 | }; |
285 | ||
286 | if (regno < 0) | |
287 | return (NULL); | |
288 | if (regno >= (sizeof(register_names) / sizeof(*register_names))) | |
289 | return (NULL); | |
290 | return (register_names[regno]); | |
291 | } | |
d734c450 | 292 | |
dc129d82 | 293 | static int |
d734c450 JT |
294 | alpha_cannot_fetch_register (int regno) |
295 | { | |
0ba6dca9 | 296 | return (regno == DEPRECATED_FP_REGNUM || regno == ALPHA_ZERO_REGNUM); |
d734c450 JT |
297 | } |
298 | ||
dc129d82 | 299 | static int |
d734c450 JT |
300 | alpha_cannot_store_register (int regno) |
301 | { | |
0ba6dca9 | 302 | return (regno == DEPRECATED_FP_REGNUM || regno == ALPHA_ZERO_REGNUM); |
d734c450 JT |
303 | } |
304 | ||
dc129d82 | 305 | static int |
d734c450 JT |
306 | alpha_register_convertible (int regno) |
307 | { | |
308 | return (regno >= FP0_REGNUM && regno <= FP0_REGNUM + 31); | |
309 | } | |
0d056799 | 310 | |
dc129d82 | 311 | static struct type * |
0d056799 JT |
312 | alpha_register_virtual_type (int regno) |
313 | { | |
314 | return ((regno >= FP0_REGNUM && regno < (FP0_REGNUM+31)) | |
315 | ? builtin_type_double : builtin_type_long); | |
316 | } | |
f8453e34 | 317 | |
dc129d82 | 318 | static int |
f8453e34 JT |
319 | alpha_register_byte (int regno) |
320 | { | |
321 | return (regno * 8); | |
322 | } | |
323 | ||
dc129d82 | 324 | static int |
f8453e34 JT |
325 | alpha_register_raw_size (int regno) |
326 | { | |
327 | return 8; | |
328 | } | |
329 | ||
dc129d82 | 330 | static int |
f8453e34 JT |
331 | alpha_register_virtual_size (int regno) |
332 | { | |
333 | return 8; | |
334 | } | |
636a6dfc JT |
335 | \f |
336 | ||
5868c862 JT |
337 | static CORE_ADDR |
338 | alpha_sigcontext_addr (struct frame_info *fi) | |
339 | { | |
340 | struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); | |
341 | ||
342 | if (tdep->sigcontext_addr) | |
343 | return (tdep->sigcontext_addr (fi)); | |
344 | ||
345 | return (0); | |
346 | } | |
347 | ||
c906108c SS |
348 | /* Guaranteed to set frame->saved_regs to some values (it never leaves it |
349 | NULL). */ | |
350 | ||
140f9984 | 351 | static void |
fba45db2 | 352 | alpha_find_saved_regs (struct frame_info *frame) |
c906108c SS |
353 | { |
354 | int ireg; | |
355 | CORE_ADDR reg_position; | |
356 | unsigned long mask; | |
357 | alpha_extra_func_info_t proc_desc; | |
358 | int returnreg; | |
359 | ||
360 | frame_saved_regs_zalloc (frame); | |
361 | ||
362 | /* If it is the frame for __sigtramp, the saved registers are located | |
363 | in a sigcontext structure somewhere on the stack. __sigtramp | |
364 | passes a pointer to the sigcontext structure on the stack. | |
365 | If the stack layout for __sigtramp changes, or if sigcontext offsets | |
366 | change, we might have to update this code. */ | |
367 | #ifndef SIGFRAME_PC_OFF | |
368 | #define SIGFRAME_PC_OFF (2 * 8) | |
369 | #define SIGFRAME_REGSAVE_OFF (4 * 8) | |
370 | #define SIGFRAME_FPREGSAVE_OFF (SIGFRAME_REGSAVE_OFF + 32 * 8 + 8) | |
371 | #endif | |
5a203e44 | 372 | if ((get_frame_type (frame) == SIGTRAMP_FRAME)) |
c906108c SS |
373 | { |
374 | CORE_ADDR sigcontext_addr; | |
375 | ||
5868c862 JT |
376 | sigcontext_addr = alpha_sigcontext_addr (frame); |
377 | if (sigcontext_addr == 0) | |
378 | { | |
379 | /* Don't know where the sigcontext is; just bail. */ | |
380 | return; | |
381 | } | |
c906108c SS |
382 | for (ireg = 0; ireg < 32; ireg++) |
383 | { | |
c5aa993b | 384 | reg_position = sigcontext_addr + SIGFRAME_REGSAVE_OFF + ireg * 8; |
b2fb4676 | 385 | get_frame_saved_regs (frame)[ireg] = reg_position; |
c906108c SS |
386 | } |
387 | for (ireg = 0; ireg < 32; ireg++) | |
388 | { | |
c5aa993b | 389 | reg_position = sigcontext_addr + SIGFRAME_FPREGSAVE_OFF + ireg * 8; |
b2fb4676 | 390 | get_frame_saved_regs (frame)[FP0_REGNUM + ireg] = reg_position; |
c906108c | 391 | } |
b2fb4676 | 392 | get_frame_saved_regs (frame)[PC_REGNUM] = sigcontext_addr + SIGFRAME_PC_OFF; |
c906108c SS |
393 | return; |
394 | } | |
395 | ||
da50a4b7 | 396 | proc_desc = get_frame_extra_info (frame)->proc_desc; |
c906108c SS |
397 | if (proc_desc == NULL) |
398 | /* I'm not sure how/whether this can happen. Normally when we can't | |
399 | find a proc_desc, we "synthesize" one using heuristic_proc_desc | |
400 | and set the saved_regs right away. */ | |
401 | return; | |
402 | ||
403 | /* Fill in the offsets for the registers which gen_mask says | |
404 | were saved. */ | |
405 | ||
1e2330ba | 406 | reg_position = get_frame_base (frame) + PROC_REG_OFFSET (proc_desc); |
c906108c SS |
407 | mask = PROC_REG_MASK (proc_desc); |
408 | ||
409 | returnreg = PROC_PC_REG (proc_desc); | |
410 | ||
411 | /* Note that RA is always saved first, regardless of its actual | |
412 | register number. */ | |
413 | if (mask & (1 << returnreg)) | |
414 | { | |
b2fb4676 | 415 | get_frame_saved_regs (frame)[returnreg] = reg_position; |
c906108c | 416 | reg_position += 8; |
c5aa993b JM |
417 | mask &= ~(1 << returnreg); /* Clear bit for RA so we |
418 | don't save again later. */ | |
c906108c SS |
419 | } |
420 | ||
c5aa993b | 421 | for (ireg = 0; ireg <= 31; ++ireg) |
c906108c SS |
422 | if (mask & (1 << ireg)) |
423 | { | |
b2fb4676 | 424 | get_frame_saved_regs (frame)[ireg] = reg_position; |
c906108c SS |
425 | reg_position += 8; |
426 | } | |
427 | ||
428 | /* Fill in the offsets for the registers which float_mask says | |
429 | were saved. */ | |
430 | ||
1e2330ba | 431 | reg_position = get_frame_base (frame) + PROC_FREG_OFFSET (proc_desc); |
c906108c SS |
432 | mask = PROC_FREG_MASK (proc_desc); |
433 | ||
c5aa993b | 434 | for (ireg = 0; ireg <= 31; ++ireg) |
c906108c SS |
435 | if (mask & (1 << ireg)) |
436 | { | |
b2fb4676 | 437 | get_frame_saved_regs (frame)[FP0_REGNUM + ireg] = reg_position; |
c906108c SS |
438 | reg_position += 8; |
439 | } | |
440 | ||
b2fb4676 | 441 | get_frame_saved_regs (frame)[PC_REGNUM] = get_frame_saved_regs (frame)[returnreg]; |
c906108c SS |
442 | } |
443 | ||
dc129d82 | 444 | static void |
140f9984 JT |
445 | alpha_frame_init_saved_regs (struct frame_info *fi) |
446 | { | |
b2fb4676 | 447 | if (get_frame_saved_regs (fi) == NULL) |
140f9984 | 448 | alpha_find_saved_regs (fi); |
1e2330ba | 449 | get_frame_saved_regs (fi)[SP_REGNUM] = get_frame_base (fi); |
140f9984 JT |
450 | } |
451 | ||
97f46953 | 452 | static CORE_ADDR |
0d056799 JT |
453 | alpha_init_frame_pc_first (int fromleaf, struct frame_info *prev) |
454 | { | |
6913c89a AC |
455 | return (fromleaf |
456 | ? DEPRECATED_SAVED_PC_AFTER_CALL (get_next_frame (prev)) | |
457 | : get_next_frame (prev) | |
458 | ? DEPRECATED_FRAME_SAVED_PC (get_next_frame (prev)) | |
97f46953 | 459 | : read_pc ()); |
0d056799 JT |
460 | } |
461 | ||
c906108c | 462 | static CORE_ADDR |
fba45db2 | 463 | read_next_frame_reg (struct frame_info *fi, int regno) |
c906108c | 464 | { |
11c02a10 | 465 | for (; fi; fi = get_next_frame (fi)) |
c906108c SS |
466 | { |
467 | /* We have to get the saved sp from the sigcontext | |
c5aa993b | 468 | if it is a signal handler frame. */ |
5a203e44 | 469 | if (regno == SP_REGNUM && !(get_frame_type (fi) == SIGTRAMP_FRAME)) |
1e2330ba | 470 | return get_frame_base (fi); |
c906108c SS |
471 | else |
472 | { | |
b2fb4676 | 473 | if (get_frame_saved_regs (fi) == NULL) |
c906108c | 474 | alpha_find_saved_regs (fi); |
b2fb4676 AC |
475 | if (get_frame_saved_regs (fi)[regno]) |
476 | return read_memory_integer (get_frame_saved_regs (fi)[regno], 8); | |
c906108c SS |
477 | } |
478 | } | |
c5aa993b | 479 | return read_register (regno); |
c906108c SS |
480 | } |
481 | ||
dc129d82 | 482 | static CORE_ADDR |
fba45db2 | 483 | alpha_frame_saved_pc (struct frame_info *frame) |
c906108c | 484 | { |
da50a4b7 | 485 | alpha_extra_func_info_t proc_desc = get_frame_extra_info (frame)->proc_desc; |
c906108c SS |
486 | /* We have to get the saved pc from the sigcontext |
487 | if it is a signal handler frame. */ | |
da50a4b7 AC |
488 | int pcreg = ((get_frame_type (frame) == SIGTRAMP_FRAME) |
489 | ? PC_REGNUM | |
490 | : get_frame_extra_info (frame)->pc_reg); | |
c906108c | 491 | |
c5aa993b | 492 | if (proc_desc && PROC_DESC_IS_DUMMY (proc_desc)) |
1e2330ba | 493 | return read_memory_integer (get_frame_base (frame) - 8, 8); |
c906108c | 494 | |
c5aa993b | 495 | return read_next_frame_reg (frame, pcreg); |
c906108c SS |
496 | } |
497 | ||
dc129d82 | 498 | static CORE_ADDR |
fba45db2 | 499 | alpha_saved_pc_after_call (struct frame_info *frame) |
c906108c | 500 | { |
50abf9e5 | 501 | CORE_ADDR pc = get_frame_pc (frame); |
c906108c SS |
502 | CORE_ADDR tmp; |
503 | alpha_extra_func_info_t proc_desc; | |
504 | int pcreg; | |
505 | ||
506 | /* Skip over shared library trampoline if necessary. */ | |
507 | tmp = SKIP_TRAMPOLINE_CODE (pc); | |
508 | if (tmp != 0) | |
509 | pc = tmp; | |
510 | ||
11c02a10 | 511 | proc_desc = find_proc_desc (pc, get_next_frame (frame)); |
dc129d82 | 512 | pcreg = proc_desc ? PROC_PC_REG (proc_desc) : ALPHA_RA_REGNUM; |
c906108c | 513 | |
5a203e44 | 514 | if ((get_frame_type (frame) == SIGTRAMP_FRAME)) |
c906108c SS |
515 | return alpha_frame_saved_pc (frame); |
516 | else | |
517 | return read_register (pcreg); | |
518 | } | |
519 | ||
520 | ||
521 | static struct alpha_extra_func_info temp_proc_desc; | |
dc129d82 | 522 | static CORE_ADDR temp_saved_regs[ALPHA_NUM_REGS]; |
c906108c SS |
523 | |
524 | /* Nonzero if instruction at PC is a return instruction. "ret | |
525 | $zero,($ra),1" on alpha. */ | |
526 | ||
527 | static int | |
fba45db2 | 528 | alpha_about_to_return (CORE_ADDR pc) |
c906108c SS |
529 | { |
530 | return read_memory_integer (pc, 4) == 0x6bfa8001; | |
531 | } | |
532 | ||
533 | ||
534 | ||
535 | /* This fencepost looks highly suspicious to me. Removing it also | |
536 | seems suspicious as it could affect remote debugging across serial | |
537 | lines. */ | |
538 | ||
539 | static CORE_ADDR | |
fba45db2 | 540 | heuristic_proc_start (CORE_ADDR pc) |
c906108c | 541 | { |
d9b023cc | 542 | struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); |
c5aa993b JM |
543 | CORE_ADDR start_pc = pc; |
544 | CORE_ADDR fence = start_pc - heuristic_fence_post; | |
c906108c | 545 | |
c5aa993b JM |
546 | if (start_pc == 0) |
547 | return 0; | |
c906108c | 548 | |
c5aa993b | 549 | if (heuristic_fence_post == UINT_MAX |
d9b023cc JT |
550 | || fence < tdep->vm_min_address) |
551 | fence = tdep->vm_min_address; | |
c906108c | 552 | |
c5aa993b JM |
553 | /* search back for previous return */ |
554 | for (start_pc -= 4;; start_pc -= 4) | |
555 | if (start_pc < fence) | |
556 | { | |
557 | /* It's not clear to me why we reach this point when | |
c0236d92 | 558 | stop_soon, but with this test, at least we |
c5aa993b JM |
559 | don't print out warnings for every child forked (eg, on |
560 | decstation). 22apr93 rich@cygnus.com. */ | |
c0236d92 | 561 | if (stop_soon == NO_STOP_QUIETLY) |
c906108c | 562 | { |
c5aa993b JM |
563 | static int blurb_printed = 0; |
564 | ||
d9b023cc | 565 | if (fence == tdep->vm_min_address) |
c5aa993b JM |
566 | warning ("Hit beginning of text section without finding"); |
567 | else | |
568 | warning ("Hit heuristic-fence-post without finding"); | |
569 | ||
d4f3574e | 570 | warning ("enclosing function for address 0x%s", paddr_nz (pc)); |
c5aa993b | 571 | if (!blurb_printed) |
c906108c | 572 | { |
c5aa993b | 573 | printf_filtered ("\ |
c906108c SS |
574 | This warning occurs if you are debugging a function without any symbols\n\ |
575 | (for example, in a stripped executable). In that case, you may wish to\n\ | |
576 | increase the size of the search with the `set heuristic-fence-post' command.\n\ | |
577 | \n\ | |
578 | Otherwise, you told GDB there was a function where there isn't one, or\n\ | |
579 | (more likely) you have encountered a bug in GDB.\n"); | |
c5aa993b | 580 | blurb_printed = 1; |
c906108c | 581 | } |
c906108c | 582 | } |
c906108c | 583 | |
c5aa993b JM |
584 | return 0; |
585 | } | |
586 | else if (alpha_about_to_return (start_pc)) | |
587 | break; | |
588 | ||
589 | start_pc += 4; /* skip return */ | |
590 | return start_pc; | |
c906108c SS |
591 | } |
592 | ||
593 | static alpha_extra_func_info_t | |
fba45db2 KB |
594 | heuristic_proc_desc (CORE_ADDR start_pc, CORE_ADDR limit_pc, |
595 | struct frame_info *next_frame) | |
c906108c | 596 | { |
c5aa993b | 597 | CORE_ADDR sp = read_next_frame_reg (next_frame, SP_REGNUM); |
dc1b0db2 | 598 | CORE_ADDR vfp = sp; |
c5aa993b JM |
599 | CORE_ADDR cur_pc; |
600 | int frame_size; | |
601 | int has_frame_reg = 0; | |
602 | unsigned long reg_mask = 0; | |
603 | int pcreg = -1; | |
dc1b0db2 | 604 | int regno; |
c5aa993b JM |
605 | |
606 | if (start_pc == 0) | |
607 | return NULL; | |
608 | memset (&temp_proc_desc, '\0', sizeof (temp_proc_desc)); | |
140f9984 | 609 | memset (&temp_saved_regs, '\0', SIZEOF_FRAME_SAVED_REGS); |
c5aa993b JM |
610 | PROC_LOW_ADDR (&temp_proc_desc) = start_pc; |
611 | ||
612 | if (start_pc + 200 < limit_pc) | |
613 | limit_pc = start_pc + 200; | |
614 | frame_size = 0; | |
615 | for (cur_pc = start_pc; cur_pc < limit_pc; cur_pc += 4) | |
616 | { | |
617 | char buf[4]; | |
618 | unsigned long word; | |
619 | int status; | |
c906108c | 620 | |
c5aa993b JM |
621 | status = read_memory_nobpt (cur_pc, buf, 4); |
622 | if (status) | |
623 | memory_error (status, cur_pc); | |
624 | word = extract_unsigned_integer (buf, 4); | |
c906108c | 625 | |
c5aa993b JM |
626 | if ((word & 0xffff0000) == 0x23de0000) /* lda $sp,n($sp) */ |
627 | { | |
628 | if (word & 0x8000) | |
dc1b0db2 JB |
629 | { |
630 | /* Consider only the first stack allocation instruction | |
631 | to contain the static size of the frame. */ | |
632 | if (frame_size == 0) | |
633 | frame_size += (-word) & 0xffff; | |
634 | } | |
c5aa993b JM |
635 | else |
636 | /* Exit loop if a positive stack adjustment is found, which | |
637 | usually means that the stack cleanup code in the function | |
638 | epilogue is reached. */ | |
639 | break; | |
640 | } | |
641 | else if ((word & 0xfc1f0000) == 0xb41e0000 /* stq reg,n($sp) */ | |
642 | && (word & 0xffff0000) != 0xb7fe0000) /* reg != $zero */ | |
643 | { | |
644 | int reg = (word & 0x03e00000) >> 21; | |
645 | reg_mask |= 1 << reg; | |
dc1b0db2 JB |
646 | |
647 | /* Do not compute the address where the register was saved yet, | |
648 | because we don't know yet if the offset will need to be | |
649 | relative to $sp or $fp (we can not compute the address relative | |
650 | to $sp if $sp is updated during the execution of the current | |
651 | subroutine, for instance when doing some alloca). So just store | |
652 | the offset for the moment, and compute the address later | |
653 | when we know whether this frame has a frame pointer or not. | |
654 | */ | |
655 | temp_saved_regs[reg] = (short) word; | |
c5aa993b JM |
656 | |
657 | /* Starting with OSF/1-3.2C, the system libraries are shipped | |
658 | without local symbols, but they still contain procedure | |
659 | descriptors without a symbol reference. GDB is currently | |
660 | unable to find these procedure descriptors and uses | |
661 | heuristic_proc_desc instead. | |
662 | As some low level compiler support routines (__div*, __add*) | |
663 | use a non-standard return address register, we have to | |
664 | add some heuristics to determine the return address register, | |
665 | or stepping over these routines will fail. | |
666 | Usually the return address register is the first register | |
667 | saved on the stack, but assembler optimization might | |
668 | rearrange the register saves. | |
669 | So we recognize only a few registers (t7, t9, ra) within | |
670 | the procedure prologue as valid return address registers. | |
671 | If we encounter a return instruction, we extract the | |
672 | the return address register from it. | |
673 | ||
674 | FIXME: Rewriting GDB to access the procedure descriptors, | |
675 | e.g. via the minimal symbol table, might obviate this hack. */ | |
676 | if (pcreg == -1 | |
677 | && cur_pc < (start_pc + 80) | |
dc129d82 JT |
678 | && (reg == ALPHA_T7_REGNUM || reg == ALPHA_T9_REGNUM |
679 | || reg == ALPHA_RA_REGNUM)) | |
c5aa993b JM |
680 | pcreg = reg; |
681 | } | |
682 | else if ((word & 0xffe0ffff) == 0x6be08001) /* ret zero,reg,1 */ | |
683 | pcreg = (word >> 16) & 0x1f; | |
dc1b0db2 JB |
684 | else if (word == 0x47de040f || word == 0x47fe040f) /* bis sp,sp fp */ |
685 | { | |
686 | /* ??? I am not sure what instruction is 0x47fe040f, and I | |
687 | am suspecting that there was a typo and should have been | |
688 | 0x47fe040f. I'm keeping it in the test above until further | |
689 | investigation */ | |
690 | has_frame_reg = 1; | |
691 | vfp = read_next_frame_reg (next_frame, ALPHA_GCC_FP_REGNUM); | |
692 | } | |
c5aa993b JM |
693 | } |
694 | if (pcreg == -1) | |
695 | { | |
696 | /* If we haven't found a valid return address register yet, | |
697 | keep searching in the procedure prologue. */ | |
698 | while (cur_pc < (limit_pc + 80) && cur_pc < (start_pc + 80)) | |
699 | { | |
700 | char buf[4]; | |
701 | unsigned long word; | |
c906108c | 702 | |
c5aa993b JM |
703 | if (read_memory_nobpt (cur_pc, buf, 4)) |
704 | break; | |
705 | cur_pc += 4; | |
706 | word = extract_unsigned_integer (buf, 4); | |
c906108c | 707 | |
c5aa993b JM |
708 | if ((word & 0xfc1f0000) == 0xb41e0000 /* stq reg,n($sp) */ |
709 | && (word & 0xffff0000) != 0xb7fe0000) /* reg != $zero */ | |
710 | { | |
711 | int reg = (word & 0x03e00000) >> 21; | |
dc129d82 JT |
712 | if (reg == ALPHA_T7_REGNUM || reg == ALPHA_T9_REGNUM |
713 | || reg == ALPHA_RA_REGNUM) | |
c5aa993b JM |
714 | { |
715 | pcreg = reg; | |
716 | break; | |
717 | } | |
718 | } | |
719 | else if ((word & 0xffe0ffff) == 0x6be08001) /* ret zero,reg,1 */ | |
720 | { | |
721 | pcreg = (word >> 16) & 0x1f; | |
722 | break; | |
723 | } | |
724 | } | |
725 | } | |
c906108c | 726 | |
c5aa993b | 727 | if (has_frame_reg) |
dc129d82 | 728 | PROC_FRAME_REG (&temp_proc_desc) = ALPHA_GCC_FP_REGNUM; |
c5aa993b JM |
729 | else |
730 | PROC_FRAME_REG (&temp_proc_desc) = SP_REGNUM; | |
dc1b0db2 JB |
731 | |
732 | /* At this point, we know which of the Stack Pointer or the Frame Pointer | |
733 | to use as the reference address to compute the saved registers address. | |
734 | But in both cases, the processing above has set vfp to this reference | |
735 | address, so just need to increment the offset of each saved register | |
736 | by this address. */ | |
737 | for (regno = 0; regno < NUM_REGS; regno++) | |
738 | { | |
739 | if (reg_mask & 1 << regno) | |
740 | temp_saved_regs[regno] += vfp; | |
741 | } | |
742 | ||
c5aa993b JM |
743 | PROC_FRAME_OFFSET (&temp_proc_desc) = frame_size; |
744 | PROC_REG_MASK (&temp_proc_desc) = reg_mask; | |
dc129d82 | 745 | PROC_PC_REG (&temp_proc_desc) = (pcreg == -1) ? ALPHA_RA_REGNUM : pcreg; |
c5aa993b JM |
746 | PROC_LOCALOFF (&temp_proc_desc) = 0; /* XXX - bogus */ |
747 | return &temp_proc_desc; | |
c906108c SS |
748 | } |
749 | ||
750 | /* This returns the PC of the first inst after the prologue. If we can't | |
751 | find the prologue, then return 0. */ | |
752 | ||
753 | static CORE_ADDR | |
fba45db2 | 754 | after_prologue (CORE_ADDR pc, alpha_extra_func_info_t proc_desc) |
c906108c SS |
755 | { |
756 | struct symtab_and_line sal; | |
757 | CORE_ADDR func_addr, func_end; | |
758 | ||
759 | if (!proc_desc) | |
760 | proc_desc = find_proc_desc (pc, NULL); | |
761 | ||
762 | if (proc_desc) | |
763 | { | |
36a6271d | 764 | if (alpha_proc_desc_is_dyn_sigtramp (proc_desc)) |
c906108c SS |
765 | return PROC_LOW_ADDR (proc_desc); /* "prologue" is in kernel */ |
766 | ||
767 | /* If function is frameless, then we need to do it the hard way. I | |
c5aa993b | 768 | strongly suspect that frameless always means prologueless... */ |
c906108c SS |
769 | if (PROC_FRAME_REG (proc_desc) == SP_REGNUM |
770 | && PROC_FRAME_OFFSET (proc_desc) == 0) | |
771 | return 0; | |
772 | } | |
773 | ||
774 | if (!find_pc_partial_function (pc, NULL, &func_addr, &func_end)) | |
775 | return 0; /* Unknown */ | |
776 | ||
777 | sal = find_pc_line (func_addr, 0); | |
778 | ||
779 | if (sal.end < func_end) | |
780 | return sal.end; | |
781 | ||
782 | /* The line after the prologue is after the end of the function. In this | |
783 | case, tell the caller to find the prologue the hard way. */ | |
784 | ||
785 | return 0; | |
786 | } | |
787 | ||
788 | /* Return non-zero if we *might* be in a function prologue. Return zero if we | |
789 | are definitively *not* in a function prologue. */ | |
790 | ||
791 | static int | |
fba45db2 | 792 | alpha_in_prologue (CORE_ADDR pc, alpha_extra_func_info_t proc_desc) |
c906108c SS |
793 | { |
794 | CORE_ADDR after_prologue_pc; | |
795 | ||
796 | after_prologue_pc = after_prologue (pc, proc_desc); | |
797 | ||
798 | if (after_prologue_pc == 0 | |
799 | || pc < after_prologue_pc) | |
800 | return 1; | |
801 | else | |
802 | return 0; | |
803 | } | |
804 | ||
805 | static alpha_extra_func_info_t | |
fba45db2 | 806 | find_proc_desc (CORE_ADDR pc, struct frame_info *next_frame) |
c906108c SS |
807 | { |
808 | alpha_extra_func_info_t proc_desc; | |
809 | struct block *b; | |
810 | struct symbol *sym; | |
811 | CORE_ADDR startaddr; | |
812 | ||
813 | /* Try to get the proc_desc from the linked call dummy proc_descs | |
814 | if the pc is in the call dummy. | |
815 | This is hairy. In the case of nested dummy calls we have to find the | |
816 | right proc_desc, but we might not yet know the frame for the dummy | |
817 | as it will be contained in the proc_desc we are searching for. | |
818 | So we have to find the proc_desc whose frame is closest to the current | |
819 | stack pointer. */ | |
820 | ||
ae45cd16 | 821 | if (DEPRECATED_PC_IN_CALL_DUMMY (pc, 0, 0)) |
c906108c SS |
822 | { |
823 | struct linked_proc_info *link; | |
824 | CORE_ADDR sp = read_next_frame_reg (next_frame, SP_REGNUM); | |
825 | alpha_extra_func_info_t found_proc_desc = NULL; | |
826 | long min_distance = LONG_MAX; | |
827 | ||
828 | for (link = linked_proc_desc_table; link; link = link->next) | |
829 | { | |
830 | long distance = (CORE_ADDR) PROC_DUMMY_FRAME (&link->info) - sp; | |
831 | if (distance > 0 && distance < min_distance) | |
832 | { | |
833 | min_distance = distance; | |
834 | found_proc_desc = &link->info; | |
835 | } | |
836 | } | |
837 | if (found_proc_desc != NULL) | |
838 | return found_proc_desc; | |
839 | } | |
840 | ||
c5aa993b | 841 | b = block_for_pc (pc); |
c906108c SS |
842 | |
843 | find_pc_partial_function (pc, NULL, &startaddr, NULL); | |
844 | if (b == NULL) | |
845 | sym = NULL; | |
846 | else | |
847 | { | |
848 | if (startaddr > BLOCK_START (b)) | |
849 | /* This is the "pathological" case referred to in a comment in | |
850 | print_frame_info. It might be better to move this check into | |
851 | symbol reading. */ | |
852 | sym = NULL; | |
853 | else | |
854 | sym = lookup_symbol (MIPS_EFI_SYMBOL_NAME, b, LABEL_NAMESPACE, | |
855 | 0, NULL); | |
856 | } | |
857 | ||
858 | /* If we never found a PDR for this function in symbol reading, then | |
859 | examine prologues to find the information. */ | |
860 | if (sym && ((mips_extra_func_info_t) SYMBOL_VALUE (sym))->pdr.framereg == -1) | |
861 | sym = NULL; | |
862 | ||
863 | if (sym) | |
864 | { | |
c5aa993b JM |
865 | /* IF this is the topmost frame AND |
866 | * (this proc does not have debugging information OR | |
867 | * the PC is in the procedure prologue) | |
868 | * THEN create a "heuristic" proc_desc (by analyzing | |
869 | * the actual code) to replace the "official" proc_desc. | |
870 | */ | |
871 | proc_desc = (alpha_extra_func_info_t) SYMBOL_VALUE (sym); | |
872 | if (next_frame == NULL) | |
873 | { | |
874 | if (PROC_DESC_IS_DUMMY (proc_desc) || alpha_in_prologue (pc, proc_desc)) | |
875 | { | |
876 | alpha_extra_func_info_t found_heuristic = | |
877 | heuristic_proc_desc (PROC_LOW_ADDR (proc_desc), | |
878 | pc, next_frame); | |
879 | if (found_heuristic) | |
880 | { | |
881 | PROC_LOCALOFF (found_heuristic) = | |
882 | PROC_LOCALOFF (proc_desc); | |
883 | PROC_PC_REG (found_heuristic) = PROC_PC_REG (proc_desc); | |
884 | proc_desc = found_heuristic; | |
885 | } | |
886 | } | |
887 | } | |
c906108c SS |
888 | } |
889 | else | |
890 | { | |
891 | long offset; | |
892 | ||
893 | /* Is linked_proc_desc_table really necessary? It only seems to be used | |
c5aa993b JM |
894 | by procedure call dummys. However, the procedures being called ought |
895 | to have their own proc_descs, and even if they don't, | |
896 | heuristic_proc_desc knows how to create them! */ | |
c906108c SS |
897 | |
898 | register struct linked_proc_info *link; | |
899 | for (link = linked_proc_desc_table; link; link = link->next) | |
c5aa993b JM |
900 | if (PROC_LOW_ADDR (&link->info) <= pc |
901 | && PROC_HIGH_ADDR (&link->info) > pc) | |
902 | return &link->info; | |
c906108c SS |
903 | |
904 | /* If PC is inside a dynamically generated sigtramp handler, | |
c5aa993b | 905 | create and push a procedure descriptor for that code: */ |
36a6271d | 906 | offset = alpha_dynamic_sigtramp_offset (pc); |
c906108c SS |
907 | if (offset >= 0) |
908 | return push_sigtramp_desc (pc - offset); | |
909 | ||
910 | /* If heuristic_fence_post is non-zero, determine the procedure | |
c5aa993b JM |
911 | start address by examining the instructions. |
912 | This allows us to find the start address of static functions which | |
913 | have no symbolic information, as startaddr would have been set to | |
914 | the preceding global function start address by the | |
915 | find_pc_partial_function call above. */ | |
c906108c SS |
916 | if (startaddr == 0 || heuristic_fence_post != 0) |
917 | startaddr = heuristic_proc_start (pc); | |
918 | ||
919 | proc_desc = | |
920 | heuristic_proc_desc (startaddr, pc, next_frame); | |
921 | } | |
922 | return proc_desc; | |
923 | } | |
924 | ||
925 | alpha_extra_func_info_t cached_proc_desc; | |
926 | ||
dc129d82 | 927 | static CORE_ADDR |
fba45db2 | 928 | alpha_frame_chain (struct frame_info *frame) |
c906108c | 929 | { |
c5aa993b | 930 | alpha_extra_func_info_t proc_desc; |
8bedc050 | 931 | CORE_ADDR saved_pc = DEPRECATED_FRAME_SAVED_PC (frame); |
c5aa993b JM |
932 | |
933 | if (saved_pc == 0 || inside_entry_file (saved_pc)) | |
934 | return 0; | |
935 | ||
936 | proc_desc = find_proc_desc (saved_pc, frame); | |
937 | if (!proc_desc) | |
938 | return 0; | |
939 | ||
940 | cached_proc_desc = proc_desc; | |
941 | ||
942 | /* Fetch the frame pointer for a dummy frame from the procedure | |
943 | descriptor. */ | |
944 | if (PROC_DESC_IS_DUMMY (proc_desc)) | |
945 | return (CORE_ADDR) PROC_DUMMY_FRAME (proc_desc); | |
946 | ||
947 | /* If no frame pointer and frame size is zero, we must be at end | |
948 | of stack (or otherwise hosed). If we don't check frame size, | |
949 | we loop forever if we see a zero size frame. */ | |
950 | if (PROC_FRAME_REG (proc_desc) == SP_REGNUM | |
951 | && PROC_FRAME_OFFSET (proc_desc) == 0 | |
952 | /* The previous frame from a sigtramp frame might be frameless | |
953 | and have frame size zero. */ | |
5a203e44 | 954 | && !(get_frame_type (frame) == SIGTRAMP_FRAME)) |
36a6271d | 955 | return alpha_frame_past_sigtramp_frame (frame, saved_pc); |
c5aa993b JM |
956 | else |
957 | return read_next_frame_reg (frame, PROC_FRAME_REG (proc_desc)) | |
958 | + PROC_FRAME_OFFSET (proc_desc); | |
c906108c SS |
959 | } |
960 | ||
961 | void | |
140f9984 JT |
962 | alpha_print_extra_frame_info (struct frame_info *fi) |
963 | { | |
964 | if (fi | |
da50a4b7 AC |
965 | && get_frame_extra_info (fi) |
966 | && get_frame_extra_info (fi)->proc_desc | |
967 | && get_frame_extra_info (fi)->proc_desc->pdr.framereg < NUM_REGS) | |
140f9984 | 968 | printf_filtered (" frame pointer is at %s+%s\n", |
da50a4b7 AC |
969 | REGISTER_NAME (get_frame_extra_info (fi)->proc_desc->pdr.framereg), |
970 | paddr_d (get_frame_extra_info (fi)->proc_desc->pdr.frameoffset)); | |
140f9984 JT |
971 | } |
972 | ||
dc129d82 | 973 | static void |
140f9984 | 974 | alpha_init_extra_frame_info (int fromleaf, struct frame_info *frame) |
c906108c SS |
975 | { |
976 | /* Use proc_desc calculated in frame_chain */ | |
977 | alpha_extra_func_info_t proc_desc = | |
11c02a10 AC |
978 | get_next_frame (frame) |
979 | ? cached_proc_desc | |
980 | : find_proc_desc (get_frame_pc (frame), get_next_frame (frame)); | |
c906108c | 981 | |
a00a19e9 | 982 | frame_extra_info_zalloc (frame, sizeof (struct frame_extra_info)); |
140f9984 | 983 | |
b2fb4676 AC |
984 | /* NOTE: cagney/2003-01-03: No need to set saved_regs to NULL, |
985 | always NULL by default. */ | |
986 | /* frame->saved_regs = NULL; */ | |
da50a4b7 AC |
987 | get_frame_extra_info (frame)->localoff = 0; |
988 | get_frame_extra_info (frame)->pc_reg = ALPHA_RA_REGNUM; | |
989 | get_frame_extra_info (frame)->proc_desc = proc_desc == &temp_proc_desc ? 0 : proc_desc; | |
c906108c SS |
990 | if (proc_desc) |
991 | { | |
992 | /* Get the locals offset and the saved pc register from the | |
c5aa993b JM |
993 | procedure descriptor, they are valid even if we are in the |
994 | middle of the prologue. */ | |
da50a4b7 AC |
995 | get_frame_extra_info (frame)->localoff = PROC_LOCALOFF (proc_desc); |
996 | get_frame_extra_info (frame)->pc_reg = PROC_PC_REG (proc_desc); | |
c906108c SS |
997 | |
998 | /* Fixup frame-pointer - only needed for top frame */ | |
999 | ||
1000 | /* Fetch the frame pointer for a dummy frame from the procedure | |
c5aa993b JM |
1001 | descriptor. */ |
1002 | if (PROC_DESC_IS_DUMMY (proc_desc)) | |
8ccd593b | 1003 | deprecated_update_frame_base_hack (frame, (CORE_ADDR) PROC_DUMMY_FRAME (proc_desc)); |
c906108c SS |
1004 | |
1005 | /* This may not be quite right, if proc has a real frame register. | |
c5aa993b JM |
1006 | Get the value of the frame relative sp, procedure might have been |
1007 | interrupted by a signal at it's very start. */ | |
50abf9e5 | 1008 | else if (get_frame_pc (frame) == PROC_LOW_ADDR (proc_desc) |
36a6271d | 1009 | && !alpha_proc_desc_is_dyn_sigtramp (proc_desc)) |
11c02a10 | 1010 | deprecated_update_frame_base_hack (frame, read_next_frame_reg (get_next_frame (frame), SP_REGNUM)); |
c906108c | 1011 | else |
11c02a10 | 1012 | deprecated_update_frame_base_hack (frame, read_next_frame_reg (get_next_frame (frame), PROC_FRAME_REG (proc_desc)) |
8ccd593b | 1013 | + PROC_FRAME_OFFSET (proc_desc)); |
c906108c SS |
1014 | |
1015 | if (proc_desc == &temp_proc_desc) | |
1016 | { | |
1017 | char *name; | |
1018 | ||
1019 | /* Do not set the saved registers for a sigtramp frame, | |
5a203e44 AC |
1020 | alpha_find_saved_registers will do that for us. We can't |
1021 | use (get_frame_type (frame) == SIGTRAMP_FRAME), it is not | |
1022 | yet set. */ | |
1023 | /* FIXME: cagney/2002-11-18: This problem will go away once | |
1024 | frame.c:get_prev_frame() is modified to set the frame's | |
1025 | type before calling functions like this. */ | |
50abf9e5 | 1026 | find_pc_partial_function (get_frame_pc (frame), &name, |
c5aa993b | 1027 | (CORE_ADDR *) NULL, (CORE_ADDR *) NULL); |
50abf9e5 | 1028 | if (!PC_IN_SIGTRAMP (get_frame_pc (frame), name)) |
c906108c | 1029 | { |
b2fb4676 AC |
1030 | frame_saved_regs_zalloc (frame); |
1031 | memcpy (get_frame_saved_regs (frame), temp_saved_regs, | |
140f9984 | 1032 | SIZEOF_FRAME_SAVED_REGS); |
b2fb4676 AC |
1033 | get_frame_saved_regs (frame)[PC_REGNUM] |
1034 | = get_frame_saved_regs (frame)[ALPHA_RA_REGNUM]; | |
c906108c SS |
1035 | } |
1036 | } | |
1037 | } | |
1038 | } | |
1039 | ||
dc129d82 | 1040 | static CORE_ADDR |
140f9984 JT |
1041 | alpha_frame_locals_address (struct frame_info *fi) |
1042 | { | |
da50a4b7 | 1043 | return (get_frame_base (fi) - get_frame_extra_info (fi)->localoff); |
140f9984 JT |
1044 | } |
1045 | ||
dc129d82 | 1046 | static CORE_ADDR |
140f9984 JT |
1047 | alpha_frame_args_address (struct frame_info *fi) |
1048 | { | |
1e2330ba | 1049 | return (get_frame_base (fi) - (ALPHA_NUM_ARG_REGS * 8)); |
140f9984 JT |
1050 | } |
1051 | ||
c906108c SS |
1052 | /* ALPHA stack frames are almost impenetrable. When execution stops, |
1053 | we basically have to look at symbol information for the function | |
1054 | that we stopped in, which tells us *which* register (if any) is | |
1055 | the base of the frame pointer, and what offset from that register | |
1056 | the frame itself is at. | |
1057 | ||
1058 | This presents a problem when trying to examine a stack in memory | |
1059 | (that isn't executing at the moment), using the "frame" command. We | |
1060 | don't have a PC, nor do we have any registers except SP. | |
1061 | ||
1062 | This routine takes two arguments, SP and PC, and tries to make the | |
1063 | cached frames look as if these two arguments defined a frame on the | |
1064 | cache. This allows the rest of info frame to extract the important | |
1065 | arguments without difficulty. */ | |
1066 | ||
1067 | struct frame_info * | |
a57f9e49 | 1068 | alpha_setup_arbitrary_frame (int argc, CORE_ADDR *argv) |
c906108c SS |
1069 | { |
1070 | if (argc != 2) | |
1071 | error ("ALPHA frame specifications require two arguments: sp and pc"); | |
1072 | ||
1073 | return create_new_frame (argv[0], argv[1]); | |
1074 | } | |
1075 | ||
1076 | /* The alpha passes the first six arguments in the registers, the rest on | |
1077 | the stack. The register arguments are eventually transferred to the | |
1078 | argument transfer area immediately below the stack by the called function | |
1079 | anyway. So we `push' at least six arguments on the stack, `reload' the | |
1080 | argument registers and then adjust the stack pointer to point past the | |
1081 | sixth argument. This algorithm simplifies the passing of a large struct | |
1082 | which extends from the registers to the stack. | |
1083 | If the called function is returning a structure, the address of the | |
1084 | structure to be returned is passed as a hidden first argument. */ | |
1085 | ||
dc129d82 | 1086 | static CORE_ADDR |
ea7c478f | 1087 | alpha_push_arguments (int nargs, struct value **args, CORE_ADDR sp, |
fba45db2 | 1088 | int struct_return, CORE_ADDR struct_addr) |
c906108c | 1089 | { |
7a292a7a | 1090 | int i; |
c906108c SS |
1091 | int accumulate_size = struct_return ? 8 : 0; |
1092 | int arg_regs_size = ALPHA_NUM_ARG_REGS * 8; | |
c5aa993b JM |
1093 | struct alpha_arg |
1094 | { | |
1095 | char *contents; | |
1096 | int len; | |
1097 | int offset; | |
1098 | }; | |
c906108c | 1099 | struct alpha_arg *alpha_args = |
c5aa993b | 1100 | (struct alpha_arg *) alloca (nargs * sizeof (struct alpha_arg)); |
c906108c SS |
1101 | register struct alpha_arg *m_arg; |
1102 | char raw_buffer[sizeof (CORE_ADDR)]; | |
1103 | int required_arg_regs; | |
1104 | ||
1105 | for (i = 0, m_arg = alpha_args; i < nargs; i++, m_arg++) | |
1106 | { | |
ea7c478f | 1107 | struct value *arg = args[i]; |
c906108c SS |
1108 | struct type *arg_type = check_typedef (VALUE_TYPE (arg)); |
1109 | /* Cast argument to long if necessary as the compiler does it too. */ | |
1110 | switch (TYPE_CODE (arg_type)) | |
1111 | { | |
1112 | case TYPE_CODE_INT: | |
1113 | case TYPE_CODE_BOOL: | |
1114 | case TYPE_CODE_CHAR: | |
1115 | case TYPE_CODE_RANGE: | |
1116 | case TYPE_CODE_ENUM: | |
1117 | if (TYPE_LENGTH (arg_type) < TYPE_LENGTH (builtin_type_long)) | |
1118 | { | |
1119 | arg_type = builtin_type_long; | |
1120 | arg = value_cast (arg_type, arg); | |
1121 | } | |
1122 | break; | |
1123 | default: | |
1124 | break; | |
1125 | } | |
1126 | m_arg->len = TYPE_LENGTH (arg_type); | |
1127 | m_arg->offset = accumulate_size; | |
1128 | accumulate_size = (accumulate_size + m_arg->len + 7) & ~7; | |
c5aa993b | 1129 | m_arg->contents = VALUE_CONTENTS (arg); |
c906108c SS |
1130 | } |
1131 | ||
1132 | /* Determine required argument register loads, loading an argument register | |
1133 | is expensive as it uses three ptrace calls. */ | |
1134 | required_arg_regs = accumulate_size / 8; | |
1135 | if (required_arg_regs > ALPHA_NUM_ARG_REGS) | |
1136 | required_arg_regs = ALPHA_NUM_ARG_REGS; | |
1137 | ||
1138 | /* Make room for the arguments on the stack. */ | |
1139 | if (accumulate_size < arg_regs_size) | |
c5aa993b | 1140 | accumulate_size = arg_regs_size; |
c906108c SS |
1141 | sp -= accumulate_size; |
1142 | ||
1143 | /* Keep sp aligned to a multiple of 16 as the compiler does it too. */ | |
1144 | sp &= ~15; | |
1145 | ||
1146 | /* `Push' arguments on the stack. */ | |
c5aa993b JM |
1147 | for (i = nargs; m_arg--, --i >= 0;) |
1148 | write_memory (sp + m_arg->offset, m_arg->contents, m_arg->len); | |
c906108c SS |
1149 | if (struct_return) |
1150 | { | |
1151 | store_address (raw_buffer, sizeof (CORE_ADDR), struct_addr); | |
1152 | write_memory (sp, raw_buffer, sizeof (CORE_ADDR)); | |
1153 | } | |
1154 | ||
1155 | /* Load the argument registers. */ | |
1156 | for (i = 0; i < required_arg_regs; i++) | |
1157 | { | |
1158 | LONGEST val; | |
1159 | ||
1160 | val = read_memory_integer (sp + i * 8, 8); | |
dc129d82 JT |
1161 | write_register (ALPHA_A0_REGNUM + i, val); |
1162 | write_register (ALPHA_FPA0_REGNUM + i, val); | |
c906108c SS |
1163 | } |
1164 | ||
1165 | return sp + arg_regs_size; | |
1166 | } | |
1167 | ||
dc129d82 | 1168 | static void |
fba45db2 | 1169 | alpha_push_dummy_frame (void) |
c906108c SS |
1170 | { |
1171 | int ireg; | |
1172 | struct linked_proc_info *link; | |
1173 | alpha_extra_func_info_t proc_desc; | |
1174 | CORE_ADDR sp = read_register (SP_REGNUM); | |
1175 | CORE_ADDR save_address; | |
dc129d82 | 1176 | char raw_buffer[ALPHA_MAX_REGISTER_RAW_SIZE]; |
c906108c SS |
1177 | unsigned long mask; |
1178 | ||
c5aa993b | 1179 | link = (struct linked_proc_info *) xmalloc (sizeof (struct linked_proc_info)); |
c906108c SS |
1180 | link->next = linked_proc_desc_table; |
1181 | linked_proc_desc_table = link; | |
c5aa993b | 1182 | |
c906108c SS |
1183 | proc_desc = &link->info; |
1184 | ||
1185 | /* | |
1186 | * The registers we must save are all those not preserved across | |
1187 | * procedure calls. | |
1188 | * In addition, we must save the PC and RA. | |
1189 | * | |
1190 | * Dummy frame layout: | |
1191 | * (high memory) | |
c5aa993b | 1192 | * Saved PC |
c906108c SS |
1193 | * Saved F30 |
1194 | * ... | |
1195 | * Saved F0 | |
c5aa993b JM |
1196 | * Saved R29 |
1197 | * ... | |
1198 | * Saved R0 | |
1199 | * Saved R26 (RA) | |
1200 | * Parameter build area | |
c906108c SS |
1201 | * (low memory) |
1202 | */ | |
1203 | ||
1204 | /* MASK(i,j) == (1<<i) + (1<<(i+1)) + ... + (1<<j)). Assume i<=j<31. */ | |
1205 | #define MASK(i,j) ((((LONGEST)1 << ((j)+1)) - 1) ^ (((LONGEST)1 << (i)) - 1)) | |
1206 | #define GEN_REG_SAVE_MASK (MASK(0,8) | MASK(16,29)) | |
1207 | #define GEN_REG_SAVE_COUNT 24 | |
1208 | #define FLOAT_REG_SAVE_MASK (MASK(0,1) | MASK(10,30)) | |
1209 | #define FLOAT_REG_SAVE_COUNT 23 | |
1210 | /* The special register is the PC as we have no bit for it in the save masks. | |
1211 | alpha_frame_saved_pc knows where the pc is saved in a dummy frame. */ | |
1212 | #define SPECIAL_REG_SAVE_COUNT 1 | |
1213 | ||
c5aa993b JM |
1214 | PROC_REG_MASK (proc_desc) = GEN_REG_SAVE_MASK; |
1215 | PROC_FREG_MASK (proc_desc) = FLOAT_REG_SAVE_MASK; | |
c906108c SS |
1216 | /* PROC_REG_OFFSET is the offset from the dummy frame to the saved RA, |
1217 | but keep SP aligned to a multiple of 16. */ | |
c5aa993b JM |
1218 | PROC_REG_OFFSET (proc_desc) = |
1219 | -((8 * (SPECIAL_REG_SAVE_COUNT | |
c906108c SS |
1220 | + GEN_REG_SAVE_COUNT |
1221 | + FLOAT_REG_SAVE_COUNT) | |
c5aa993b JM |
1222 | + 15) & ~15); |
1223 | PROC_FREG_OFFSET (proc_desc) = | |
1224 | PROC_REG_OFFSET (proc_desc) + 8 * GEN_REG_SAVE_COUNT; | |
c906108c SS |
1225 | |
1226 | /* Save general registers. | |
1227 | The return address register is the first saved register, all other | |
1228 | registers follow in ascending order. | |
1229 | The PC is saved immediately below the SP. */ | |
c5aa993b | 1230 | save_address = sp + PROC_REG_OFFSET (proc_desc); |
dc129d82 | 1231 | store_address (raw_buffer, 8, read_register (ALPHA_RA_REGNUM)); |
c906108c SS |
1232 | write_memory (save_address, raw_buffer, 8); |
1233 | save_address += 8; | |
c5aa993b | 1234 | mask = PROC_REG_MASK (proc_desc) & 0xffffffffL; |
c906108c SS |
1235 | for (ireg = 0; mask; ireg++, mask >>= 1) |
1236 | if (mask & 1) | |
1237 | { | |
dc129d82 | 1238 | if (ireg == ALPHA_RA_REGNUM) |
c906108c SS |
1239 | continue; |
1240 | store_address (raw_buffer, 8, read_register (ireg)); | |
1241 | write_memory (save_address, raw_buffer, 8); | |
1242 | save_address += 8; | |
1243 | } | |
1244 | ||
1245 | store_address (raw_buffer, 8, read_register (PC_REGNUM)); | |
1246 | write_memory (sp - 8, raw_buffer, 8); | |
1247 | ||
1248 | /* Save floating point registers. */ | |
c5aa993b JM |
1249 | save_address = sp + PROC_FREG_OFFSET (proc_desc); |
1250 | mask = PROC_FREG_MASK (proc_desc) & 0xffffffffL; | |
c906108c SS |
1251 | for (ireg = 0; mask; ireg++, mask >>= 1) |
1252 | if (mask & 1) | |
1253 | { | |
1254 | store_address (raw_buffer, 8, read_register (ireg + FP0_REGNUM)); | |
1255 | write_memory (save_address, raw_buffer, 8); | |
1256 | save_address += 8; | |
1257 | } | |
1258 | ||
1259 | /* Set and save the frame address for the dummy. | |
1260 | This is tricky. The only registers that are suitable for a frame save | |
1261 | are those that are preserved across procedure calls (s0-s6). But if | |
1262 | a read system call is interrupted and then a dummy call is made | |
1263 | (see testsuite/gdb.t17/interrupt.exp) the dummy call hangs till the read | |
1264 | is satisfied. Then it returns with the s0-s6 registers set to the values | |
1265 | on entry to the read system call and our dummy frame pointer would be | |
1266 | destroyed. So we save the dummy frame in the proc_desc and handle the | |
1267 | retrieval of the frame pointer of a dummy specifically. The frame register | |
1268 | is set to the virtual frame (pseudo) register, it's value will always | |
1269 | be read as zero and will help us to catch any errors in the dummy frame | |
1270 | retrieval code. */ | |
c5aa993b | 1271 | PROC_DUMMY_FRAME (proc_desc) = sp; |
0ba6dca9 | 1272 | PROC_FRAME_REG (proc_desc) = DEPRECATED_FP_REGNUM; |
c5aa993b JM |
1273 | PROC_FRAME_OFFSET (proc_desc) = 0; |
1274 | sp += PROC_REG_OFFSET (proc_desc); | |
c906108c SS |
1275 | write_register (SP_REGNUM, sp); |
1276 | ||
c5aa993b JM |
1277 | PROC_LOW_ADDR (proc_desc) = CALL_DUMMY_ADDRESS (); |
1278 | PROC_HIGH_ADDR (proc_desc) = PROC_LOW_ADDR (proc_desc) + 4; | |
c906108c | 1279 | |
c5aa993b | 1280 | SET_PROC_DESC_IS_DUMMY (proc_desc); |
dc129d82 | 1281 | PROC_PC_REG (proc_desc) = ALPHA_RA_REGNUM; |
c906108c SS |
1282 | } |
1283 | ||
dc129d82 | 1284 | static void |
fba45db2 | 1285 | alpha_pop_frame (void) |
c906108c SS |
1286 | { |
1287 | register int regnum; | |
1288 | struct frame_info *frame = get_current_frame (); | |
1e2330ba | 1289 | CORE_ADDR new_sp = get_frame_base (frame); |
c906108c | 1290 | |
da50a4b7 | 1291 | alpha_extra_func_info_t proc_desc = get_frame_extra_info (frame)->proc_desc; |
c906108c | 1292 | |
9e0b60a8 JM |
1293 | /* we need proc_desc to know how to restore the registers; |
1294 | if it is NULL, construct (a temporary) one */ | |
1295 | if (proc_desc == NULL) | |
11c02a10 | 1296 | proc_desc = find_proc_desc (get_frame_pc (frame), get_next_frame (frame)); |
9e0b60a8 JM |
1297 | |
1298 | /* Question: should we copy this proc_desc and save it in | |
1299 | frame->proc_desc? If we do, who will free it? | |
1300 | For now, we don't save a copy... */ | |
1301 | ||
8bedc050 | 1302 | write_register (PC_REGNUM, DEPRECATED_FRAME_SAVED_PC (frame)); |
b2fb4676 | 1303 | if (get_frame_saved_regs (frame) == NULL) |
c906108c SS |
1304 | alpha_find_saved_regs (frame); |
1305 | if (proc_desc) | |
1306 | { | |
c5aa993b JM |
1307 | for (regnum = 32; --regnum >= 0;) |
1308 | if (PROC_REG_MASK (proc_desc) & (1 << regnum)) | |
c906108c | 1309 | write_register (regnum, |
b2fb4676 | 1310 | read_memory_integer (get_frame_saved_regs (frame)[regnum], |
c906108c | 1311 | 8)); |
c5aa993b JM |
1312 | for (regnum = 32; --regnum >= 0;) |
1313 | if (PROC_FREG_MASK (proc_desc) & (1 << regnum)) | |
c906108c | 1314 | write_register (regnum + FP0_REGNUM, |
b2fb4676 | 1315 | read_memory_integer (get_frame_saved_regs (frame)[regnum + FP0_REGNUM], 8)); |
c906108c SS |
1316 | } |
1317 | write_register (SP_REGNUM, new_sp); | |
1318 | flush_cached_frames (); | |
1319 | ||
c5aa993b | 1320 | if (proc_desc && (PROC_DESC_IS_DUMMY (proc_desc) |
36a6271d | 1321 | || alpha_proc_desc_is_dyn_sigtramp (proc_desc))) |
c906108c SS |
1322 | { |
1323 | struct linked_proc_info *pi_ptr, *prev_ptr; | |
1324 | ||
1325 | for (pi_ptr = linked_proc_desc_table, prev_ptr = NULL; | |
1326 | pi_ptr != NULL; | |
1327 | prev_ptr = pi_ptr, pi_ptr = pi_ptr->next) | |
1328 | { | |
1329 | if (&pi_ptr->info == proc_desc) | |
1330 | break; | |
1331 | } | |
1332 | ||
1333 | if (pi_ptr == NULL) | |
1334 | error ("Can't locate dummy extra frame info\n"); | |
1335 | ||
1336 | if (prev_ptr != NULL) | |
1337 | prev_ptr->next = pi_ptr->next; | |
1338 | else | |
1339 | linked_proc_desc_table = pi_ptr->next; | |
1340 | ||
b8c9b27d | 1341 | xfree (pi_ptr); |
c906108c SS |
1342 | } |
1343 | } | |
1344 | \f | |
1345 | /* To skip prologues, I use this predicate. Returns either PC itself | |
1346 | if the code at PC does not look like a function prologue; otherwise | |
1347 | returns an address that (if we're lucky) follows the prologue. If | |
1348 | LENIENT, then we must skip everything which is involved in setting | |
1349 | up the frame (it's OK to skip more, just so long as we don't skip | |
1350 | anything which might clobber the registers which are being saved. | |
0fb34c3a MS |
1351 | Currently we must not skip more on the alpha, but we might need the |
1352 | lenient stuff some day. */ | |
c906108c | 1353 | |
f8453e34 JT |
1354 | static CORE_ADDR |
1355 | alpha_skip_prologue_internal (CORE_ADDR pc, int lenient) | |
c906108c | 1356 | { |
c5aa993b JM |
1357 | unsigned long inst; |
1358 | int offset; | |
1359 | CORE_ADDR post_prologue_pc; | |
1360 | char buf[4]; | |
c906108c | 1361 | |
c5aa993b JM |
1362 | /* Silently return the unaltered pc upon memory errors. |
1363 | This could happen on OSF/1 if decode_line_1 tries to skip the | |
1364 | prologue for quickstarted shared library functions when the | |
1365 | shared library is not yet mapped in. | |
1366 | Reading target memory is slow over serial lines, so we perform | |
15d72a92 JT |
1367 | this check only if the target has shared libraries (which all |
1368 | Alpha targets do). */ | |
c5aa993b JM |
1369 | if (target_read_memory (pc, buf, 4)) |
1370 | return pc; | |
c906108c | 1371 | |
c5aa993b JM |
1372 | /* See if we can determine the end of the prologue via the symbol table. |
1373 | If so, then return either PC, or the PC after the prologue, whichever | |
1374 | is greater. */ | |
c906108c | 1375 | |
c5aa993b | 1376 | post_prologue_pc = after_prologue (pc, NULL); |
c906108c | 1377 | |
c5aa993b JM |
1378 | if (post_prologue_pc != 0) |
1379 | return max (pc, post_prologue_pc); | |
c906108c | 1380 | |
c5aa993b JM |
1381 | /* Can't determine prologue from the symbol table, need to examine |
1382 | instructions. */ | |
c906108c | 1383 | |
c5aa993b JM |
1384 | /* Skip the typical prologue instructions. These are the stack adjustment |
1385 | instruction and the instructions that save registers on the stack | |
1386 | or in the gcc frame. */ | |
1387 | for (offset = 0; offset < 100; offset += 4) | |
1388 | { | |
1389 | int status; | |
1390 | ||
1391 | status = read_memory_nobpt (pc + offset, buf, 4); | |
1392 | if (status) | |
1393 | memory_error (status, pc + offset); | |
1394 | inst = extract_unsigned_integer (buf, 4); | |
1395 | ||
1396 | /* The alpha has no delay slots. But let's keep the lenient stuff, | |
1397 | we might need it for something else in the future. */ | |
1398 | if (lenient && 0) | |
1399 | continue; | |
1400 | ||
1401 | if ((inst & 0xffff0000) == 0x27bb0000) /* ldah $gp,n($t12) */ | |
1402 | continue; | |
1403 | if ((inst & 0xffff0000) == 0x23bd0000) /* lda $gp,n($gp) */ | |
1404 | continue; | |
1405 | if ((inst & 0xffff0000) == 0x23de0000) /* lda $sp,n($sp) */ | |
1406 | continue; | |
1407 | if ((inst & 0xffe01fff) == 0x43c0153e) /* subq $sp,n,$sp */ | |
1408 | continue; | |
1409 | ||
1410 | if ((inst & 0xfc1f0000) == 0xb41e0000 | |
1411 | && (inst & 0xffff0000) != 0xb7fe0000) | |
1412 | continue; /* stq reg,n($sp) */ | |
1413 | /* reg != $zero */ | |
1414 | if ((inst & 0xfc1f0000) == 0x9c1e0000 | |
1415 | && (inst & 0xffff0000) != 0x9ffe0000) | |
1416 | continue; /* stt reg,n($sp) */ | |
1417 | /* reg != $zero */ | |
1418 | if (inst == 0x47de040f) /* bis sp,sp,fp */ | |
1419 | continue; | |
1420 | ||
1421 | break; | |
c906108c | 1422 | } |
c5aa993b | 1423 | return pc + offset; |
c906108c SS |
1424 | } |
1425 | ||
dc129d82 | 1426 | static CORE_ADDR |
f8453e34 JT |
1427 | alpha_skip_prologue (CORE_ADDR addr) |
1428 | { | |
1429 | return (alpha_skip_prologue_internal (addr, 0)); | |
1430 | } | |
1431 | ||
c906108c SS |
1432 | #if 0 |
1433 | /* Is address PC in the prologue (loosely defined) for function at | |
1434 | STARTADDR? */ | |
1435 | ||
1436 | static int | |
fba45db2 | 1437 | alpha_in_lenient_prologue (CORE_ADDR startaddr, CORE_ADDR pc) |
c906108c | 1438 | { |
f8453e34 | 1439 | CORE_ADDR end_prologue = alpha_skip_prologue_internal (startaddr, 1); |
c906108c SS |
1440 | return pc >= startaddr && pc < end_prologue; |
1441 | } | |
1442 | #endif | |
1443 | ||
1444 | /* The alpha needs a conversion between register and memory format if | |
1445 | the register is a floating point register and | |
c5aa993b | 1446 | memory format is float, as the register format must be double |
c906108c | 1447 | or |
c5aa993b JM |
1448 | memory format is an integer with 4 bytes or less, as the representation |
1449 | of integers in floating point registers is different. */ | |
dc129d82 | 1450 | static void |
fba45db2 KB |
1451 | alpha_register_convert_to_virtual (int regnum, struct type *valtype, |
1452 | char *raw_buffer, char *virtual_buffer) | |
c906108c SS |
1453 | { |
1454 | if (TYPE_LENGTH (valtype) >= REGISTER_RAW_SIZE (regnum)) | |
1455 | { | |
1456 | memcpy (virtual_buffer, raw_buffer, REGISTER_VIRTUAL_SIZE (regnum)); | |
1457 | return; | |
1458 | } | |
1459 | ||
1460 | if (TYPE_CODE (valtype) == TYPE_CODE_FLT) | |
1461 | { | |
f1908289 AC |
1462 | double d = deprecated_extract_floating (raw_buffer, REGISTER_RAW_SIZE (regnum)); |
1463 | deprecated_store_floating (virtual_buffer, TYPE_LENGTH (valtype), d); | |
c906108c SS |
1464 | } |
1465 | else if (TYPE_CODE (valtype) == TYPE_CODE_INT && TYPE_LENGTH (valtype) <= 4) | |
1466 | { | |
1467 | ULONGEST l; | |
1468 | l = extract_unsigned_integer (raw_buffer, REGISTER_RAW_SIZE (regnum)); | |
1469 | l = ((l >> 32) & 0xc0000000) | ((l >> 29) & 0x3fffffff); | |
1470 | store_unsigned_integer (virtual_buffer, TYPE_LENGTH (valtype), l); | |
1471 | } | |
1472 | else | |
1473 | error ("Cannot retrieve value from floating point register"); | |
1474 | } | |
1475 | ||
dc129d82 | 1476 | static void |
fba45db2 KB |
1477 | alpha_register_convert_to_raw (struct type *valtype, int regnum, |
1478 | char *virtual_buffer, char *raw_buffer) | |
c906108c SS |
1479 | { |
1480 | if (TYPE_LENGTH (valtype) >= REGISTER_RAW_SIZE (regnum)) | |
1481 | { | |
1482 | memcpy (raw_buffer, virtual_buffer, REGISTER_RAW_SIZE (regnum)); | |
1483 | return; | |
1484 | } | |
1485 | ||
1486 | if (TYPE_CODE (valtype) == TYPE_CODE_FLT) | |
1487 | { | |
f1908289 AC |
1488 | double d = deprecated_extract_floating (virtual_buffer, TYPE_LENGTH (valtype)); |
1489 | deprecated_store_floating (raw_buffer, REGISTER_RAW_SIZE (regnum), d); | |
c906108c SS |
1490 | } |
1491 | else if (TYPE_CODE (valtype) == TYPE_CODE_INT && TYPE_LENGTH (valtype) <= 4) | |
1492 | { | |
1493 | ULONGEST l; | |
1494 | if (TYPE_UNSIGNED (valtype)) | |
1495 | l = extract_unsigned_integer (virtual_buffer, TYPE_LENGTH (valtype)); | |
1496 | else | |
1497 | l = extract_signed_integer (virtual_buffer, TYPE_LENGTH (valtype)); | |
1498 | l = ((l & 0xc0000000) << 32) | ((l & 0x3fffffff) << 29); | |
1499 | store_unsigned_integer (raw_buffer, REGISTER_RAW_SIZE (regnum), l); | |
1500 | } | |
1501 | else | |
1502 | error ("Cannot store value in floating point register"); | |
1503 | } | |
1504 | ||
95b80706 JT |
1505 | static const unsigned char * |
1506 | alpha_breakpoint_from_pc (CORE_ADDR *pcptr, int *lenptr) | |
1507 | { | |
1508 | static const unsigned char alpha_breakpoint[] = | |
1509 | { 0x80, 0, 0, 0 }; /* call_pal bpt */ | |
1510 | ||
1511 | *lenptr = sizeof(alpha_breakpoint); | |
1512 | return (alpha_breakpoint); | |
1513 | } | |
1514 | ||
c906108c SS |
1515 | /* Given a return value in `regbuf' with a type `valtype', |
1516 | extract and copy its value into `valbuf'. */ | |
1517 | ||
dc129d82 | 1518 | static void |
732a6b2d | 1519 | alpha_extract_return_value (struct type *valtype, |
997b20b8 | 1520 | char regbuf[ALPHA_REGISTER_BYTES], char *valbuf) |
c906108c SS |
1521 | { |
1522 | if (TYPE_CODE (valtype) == TYPE_CODE_FLT) | |
1523 | alpha_register_convert_to_virtual (FP0_REGNUM, valtype, | |
1524 | regbuf + REGISTER_BYTE (FP0_REGNUM), | |
1525 | valbuf); | |
1526 | else | |
dc129d82 JT |
1527 | memcpy (valbuf, regbuf + REGISTER_BYTE (ALPHA_V0_REGNUM), |
1528 | TYPE_LENGTH (valtype)); | |
c906108c SS |
1529 | } |
1530 | ||
1531 | /* Given a return value in `regbuf' with a type `valtype', | |
1532 | write its value into the appropriate register. */ | |
1533 | ||
dc129d82 | 1534 | static void |
fba45db2 | 1535 | alpha_store_return_value (struct type *valtype, char *valbuf) |
c906108c | 1536 | { |
dc129d82 JT |
1537 | char raw_buffer[ALPHA_MAX_REGISTER_RAW_SIZE]; |
1538 | int regnum = ALPHA_V0_REGNUM; | |
c906108c | 1539 | int length = TYPE_LENGTH (valtype); |
c5aa993b | 1540 | |
c906108c SS |
1541 | if (TYPE_CODE (valtype) == TYPE_CODE_FLT) |
1542 | { | |
1543 | regnum = FP0_REGNUM; | |
1544 | length = REGISTER_RAW_SIZE (regnum); | |
1545 | alpha_register_convert_to_raw (valtype, regnum, valbuf, raw_buffer); | |
1546 | } | |
1547 | else | |
1548 | memcpy (raw_buffer, valbuf, length); | |
1549 | ||
73937e03 | 1550 | deprecated_write_register_bytes (REGISTER_BYTE (regnum), raw_buffer, length); |
c906108c SS |
1551 | } |
1552 | ||
1553 | /* Just like reinit_frame_cache, but with the right arguments to be | |
1554 | callable as an sfunc. */ | |
1555 | ||
1556 | static void | |
fba45db2 | 1557 | reinit_frame_cache_sfunc (char *args, int from_tty, struct cmd_list_element *c) |
c906108c SS |
1558 | { |
1559 | reinit_frame_cache (); | |
1560 | } | |
1561 | ||
1562 | /* This is the definition of CALL_DUMMY_ADDRESS. It's a heuristic that is used | |
1563 | to find a convenient place in the text segment to stick a breakpoint to | |
1564 | detect the completion of a target function call (ala call_function_by_hand). | |
1565 | */ | |
1566 | ||
1567 | CORE_ADDR | |
fba45db2 | 1568 | alpha_call_dummy_address (void) |
c906108c SS |
1569 | { |
1570 | CORE_ADDR entry; | |
1571 | struct minimal_symbol *sym; | |
1572 | ||
1573 | entry = entry_point_address (); | |
1574 | ||
1575 | if (entry != 0) | |
1576 | return entry; | |
1577 | ||
1578 | sym = lookup_minimal_symbol ("_Prelude", NULL, symfile_objfile); | |
1579 | ||
1580 | if (!sym || MSYMBOL_TYPE (sym) != mst_text) | |
1581 | return 0; | |
1582 | else | |
1583 | return SYMBOL_VALUE_ADDRESS (sym) + 4; | |
ec32e4be JT |
1584 | } |
1585 | ||
dc129d82 | 1586 | static void |
0d056799 JT |
1587 | alpha_fix_call_dummy (char *dummy, CORE_ADDR pc, CORE_ADDR fun, int nargs, |
1588 | struct value **args, struct type *type, int gcc_p) | |
1589 | { | |
1590 | CORE_ADDR bp_address = CALL_DUMMY_ADDRESS (); | |
1591 | ||
1592 | if (bp_address == 0) | |
1593 | error ("no place to put call"); | |
dc129d82 JT |
1594 | write_register (ALPHA_RA_REGNUM, bp_address); |
1595 | write_register (ALPHA_T12_REGNUM, fun); | |
0d056799 JT |
1596 | } |
1597 | ||
ee1f65f0 JT |
1598 | /* On the Alpha, the call dummy code is nevery copied to user space |
1599 | (see alpha_fix_call_dummy() above). The contents of this do not | |
1600 | matter. */ | |
1601 | LONGEST alpha_call_dummy_words[] = { 0 }; | |
1602 | ||
dc129d82 | 1603 | static int |
d734c450 JT |
1604 | alpha_use_struct_convention (int gcc_p, struct type *type) |
1605 | { | |
1606 | /* Structures are returned by ref in extra arg0. */ | |
1607 | return 1; | |
1608 | } | |
1609 | ||
dc129d82 | 1610 | static void |
0d056799 JT |
1611 | alpha_store_struct_return (CORE_ADDR addr, CORE_ADDR sp) |
1612 | { | |
1613 | /* Store the address of the place in which to copy the structure the | |
1614 | subroutine will return. Handled by alpha_push_arguments. */ | |
1615 | } | |
1616 | ||
dc129d82 | 1617 | static CORE_ADDR |
0d056799 JT |
1618 | alpha_extract_struct_value_address (char *regbuf) |
1619 | { | |
dc129d82 JT |
1620 | return (extract_address (regbuf + REGISTER_BYTE (ALPHA_V0_REGNUM), |
1621 | REGISTER_RAW_SIZE (ALPHA_V0_REGNUM))); | |
0d056799 JT |
1622 | } |
1623 | ||
accc6d1f JT |
1624 | /* Figure out where the longjmp will land. |
1625 | We expect the first arg to be a pointer to the jmp_buf structure from | |
1626 | which we extract the PC (JB_PC) that we will land at. The PC is copied | |
1627 | into the "pc". This routine returns true on success. */ | |
1628 | ||
1629 | static int | |
1630 | alpha_get_longjmp_target (CORE_ADDR *pc) | |
1631 | { | |
1632 | struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); | |
1633 | CORE_ADDR jb_addr; | |
1634 | char raw_buffer[ALPHA_MAX_REGISTER_RAW_SIZE]; | |
1635 | ||
1636 | jb_addr = read_register (ALPHA_A0_REGNUM); | |
1637 | ||
1638 | if (target_read_memory (jb_addr + (tdep->jb_pc * tdep->jb_elt_size), | |
1639 | raw_buffer, tdep->jb_elt_size)) | |
1640 | return 0; | |
1641 | ||
1642 | *pc = extract_address (raw_buffer, tdep->jb_elt_size); | |
1643 | return 1; | |
1644 | } | |
1645 | ||
ec32e4be JT |
1646 | /* alpha_software_single_step() is called just before we want to resume |
1647 | the inferior, if we want to single-step it but there is no hardware | |
1648 | or kernel single-step support (NetBSD on Alpha, for example). We find | |
1649 | the target of the coming instruction and breakpoint it. | |
1650 | ||
1651 | single_step is also called just after the inferior stops. If we had | |
1652 | set up a simulated single-step, we undo our damage. */ | |
1653 | ||
1654 | static CORE_ADDR | |
1655 | alpha_next_pc (CORE_ADDR pc) | |
1656 | { | |
1657 | unsigned int insn; | |
1658 | unsigned int op; | |
1659 | int offset; | |
1660 | LONGEST rav; | |
1661 | ||
1662 | insn = read_memory_unsigned_integer (pc, sizeof (insn)); | |
1663 | ||
1664 | /* Opcode is top 6 bits. */ | |
1665 | op = (insn >> 26) & 0x3f; | |
1666 | ||
1667 | if (op == 0x1a) | |
1668 | { | |
1669 | /* Jump format: target PC is: | |
1670 | RB & ~3 */ | |
1671 | return (read_register ((insn >> 16) & 0x1f) & ~3); | |
1672 | } | |
1673 | ||
1674 | if ((op & 0x30) == 0x30) | |
1675 | { | |
1676 | /* Branch format: target PC is: | |
1677 | (new PC) + (4 * sext(displacement)) */ | |
1678 | if (op == 0x30 || /* BR */ | |
1679 | op == 0x34) /* BSR */ | |
1680 | { | |
1681 | branch_taken: | |
1682 | offset = (insn & 0x001fffff); | |
1683 | if (offset & 0x00100000) | |
1684 | offset |= 0xffe00000; | |
1685 | offset *= 4; | |
1686 | return (pc + 4 + offset); | |
1687 | } | |
1688 | ||
1689 | /* Need to determine if branch is taken; read RA. */ | |
1690 | rav = (LONGEST) read_register ((insn >> 21) & 0x1f); | |
1691 | switch (op) | |
1692 | { | |
1693 | case 0x38: /* BLBC */ | |
1694 | if ((rav & 1) == 0) | |
1695 | goto branch_taken; | |
1696 | break; | |
1697 | case 0x3c: /* BLBS */ | |
1698 | if (rav & 1) | |
1699 | goto branch_taken; | |
1700 | break; | |
1701 | case 0x39: /* BEQ */ | |
1702 | if (rav == 0) | |
1703 | goto branch_taken; | |
1704 | break; | |
1705 | case 0x3d: /* BNE */ | |
1706 | if (rav != 0) | |
1707 | goto branch_taken; | |
1708 | break; | |
1709 | case 0x3a: /* BLT */ | |
1710 | if (rav < 0) | |
1711 | goto branch_taken; | |
1712 | break; | |
1713 | case 0x3b: /* BLE */ | |
1714 | if (rav <= 0) | |
1715 | goto branch_taken; | |
1716 | break; | |
1717 | case 0x3f: /* BGT */ | |
1718 | if (rav > 0) | |
1719 | goto branch_taken; | |
1720 | break; | |
1721 | case 0x3e: /* BGE */ | |
1722 | if (rav >= 0) | |
1723 | goto branch_taken; | |
1724 | break; | |
1725 | } | |
1726 | } | |
1727 | ||
1728 | /* Not a branch or branch not taken; target PC is: | |
1729 | pc + 4 */ | |
1730 | return (pc + 4); | |
1731 | } | |
1732 | ||
1733 | void | |
1734 | alpha_software_single_step (enum target_signal sig, int insert_breakpoints_p) | |
1735 | { | |
1736 | static CORE_ADDR next_pc; | |
1737 | typedef char binsn_quantum[BREAKPOINT_MAX]; | |
1738 | static binsn_quantum break_mem; | |
1739 | CORE_ADDR pc; | |
1740 | ||
1741 | if (insert_breakpoints_p) | |
1742 | { | |
1743 | pc = read_pc (); | |
1744 | next_pc = alpha_next_pc (pc); | |
1745 | ||
1746 | target_insert_breakpoint (next_pc, break_mem); | |
1747 | } | |
1748 | else | |
1749 | { | |
1750 | target_remove_breakpoint (next_pc, break_mem); | |
1751 | write_pc (next_pc); | |
1752 | } | |
c906108c SS |
1753 | } |
1754 | ||
dc129d82 | 1755 | \f |
44dffaac | 1756 | |
dc129d82 JT |
1757 | /* Initialize the current architecture based on INFO. If possible, re-use an |
1758 | architecture from ARCHES, which is a list of architectures already created | |
1759 | during this debugging session. | |
1760 | ||
1761 | Called e.g. at program startup, when reading a core file, and when reading | |
1762 | a binary file. */ | |
1763 | ||
1764 | static struct gdbarch * | |
1765 | alpha_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches) | |
1766 | { | |
1767 | struct gdbarch_tdep *tdep; | |
1768 | struct gdbarch *gdbarch; | |
dc129d82 JT |
1769 | |
1770 | /* Try to determine the ABI of the object we are loading. */ | |
4be87837 | 1771 | if (info.abfd != NULL && info.osabi == GDB_OSABI_UNKNOWN) |
dc129d82 | 1772 | { |
4be87837 DJ |
1773 | /* If it's an ECOFF file, assume it's OSF/1. */ |
1774 | if (bfd_get_flavour (info.abfd) == bfd_target_ecoff_flavour) | |
aff87235 | 1775 | info.osabi = GDB_OSABI_OSF1; |
dc129d82 JT |
1776 | } |
1777 | ||
1778 | /* Find a candidate among extant architectures. */ | |
4be87837 DJ |
1779 | arches = gdbarch_list_lookup_by_info (arches, &info); |
1780 | if (arches != NULL) | |
1781 | return arches->gdbarch; | |
dc129d82 JT |
1782 | |
1783 | tdep = xmalloc (sizeof (struct gdbarch_tdep)); | |
1784 | gdbarch = gdbarch_alloc (&info, tdep); | |
1785 | ||
d9b023cc JT |
1786 | /* Lowest text address. This is used by heuristic_proc_start() to |
1787 | decide when to stop looking. */ | |
1788 | tdep->vm_min_address = (CORE_ADDR) 0x120000000; | |
1789 | ||
36a6271d JT |
1790 | tdep->dynamic_sigtramp_offset = NULL; |
1791 | tdep->skip_sigtramp_frame = NULL; | |
5868c862 | 1792 | tdep->sigcontext_addr = NULL; |
36a6271d | 1793 | |
accc6d1f JT |
1794 | tdep->jb_pc = -1; /* longjmp support not enabled by default */ |
1795 | ||
dc129d82 JT |
1796 | /* Type sizes */ |
1797 | set_gdbarch_short_bit (gdbarch, 16); | |
1798 | set_gdbarch_int_bit (gdbarch, 32); | |
1799 | set_gdbarch_long_bit (gdbarch, 64); | |
1800 | set_gdbarch_long_long_bit (gdbarch, 64); | |
1801 | set_gdbarch_float_bit (gdbarch, 32); | |
1802 | set_gdbarch_double_bit (gdbarch, 64); | |
1803 | set_gdbarch_long_double_bit (gdbarch, 64); | |
1804 | set_gdbarch_ptr_bit (gdbarch, 64); | |
1805 | ||
1806 | /* Register info */ | |
1807 | set_gdbarch_num_regs (gdbarch, ALPHA_NUM_REGS); | |
1808 | set_gdbarch_sp_regnum (gdbarch, ALPHA_SP_REGNUM); | |
0ba6dca9 | 1809 | set_gdbarch_deprecated_fp_regnum (gdbarch, ALPHA_FP_REGNUM); |
dc129d82 JT |
1810 | set_gdbarch_pc_regnum (gdbarch, ALPHA_PC_REGNUM); |
1811 | set_gdbarch_fp0_regnum (gdbarch, ALPHA_FP0_REGNUM); | |
1812 | ||
1813 | set_gdbarch_register_name (gdbarch, alpha_register_name); | |
1814 | set_gdbarch_register_size (gdbarch, ALPHA_REGISTER_SIZE); | |
1815 | set_gdbarch_register_bytes (gdbarch, ALPHA_REGISTER_BYTES); | |
1816 | set_gdbarch_register_byte (gdbarch, alpha_register_byte); | |
1817 | set_gdbarch_register_raw_size (gdbarch, alpha_register_raw_size); | |
a0ed5532 | 1818 | set_gdbarch_deprecated_max_register_raw_size (gdbarch, ALPHA_MAX_REGISTER_RAW_SIZE); |
dc129d82 | 1819 | set_gdbarch_register_virtual_size (gdbarch, alpha_register_virtual_size); |
a0ed5532 | 1820 | set_gdbarch_deprecated_max_register_virtual_size (gdbarch, |
dc129d82 JT |
1821 | ALPHA_MAX_REGISTER_VIRTUAL_SIZE); |
1822 | set_gdbarch_register_virtual_type (gdbarch, alpha_register_virtual_type); | |
1823 | ||
1824 | set_gdbarch_cannot_fetch_register (gdbarch, alpha_cannot_fetch_register); | |
1825 | set_gdbarch_cannot_store_register (gdbarch, alpha_cannot_store_register); | |
1826 | ||
1827 | set_gdbarch_register_convertible (gdbarch, alpha_register_convertible); | |
1828 | set_gdbarch_register_convert_to_virtual (gdbarch, | |
1829 | alpha_register_convert_to_virtual); | |
1830 | set_gdbarch_register_convert_to_raw (gdbarch, alpha_register_convert_to_raw); | |
1831 | ||
1832 | set_gdbarch_skip_prologue (gdbarch, alpha_skip_prologue); | |
1833 | ||
1834 | set_gdbarch_frame_num_args (gdbarch, frame_num_args_unknown); | |
1835 | set_gdbarch_frameless_function_invocation (gdbarch, | |
1836 | generic_frameless_function_invocation_not); | |
1837 | ||
6913c89a | 1838 | set_gdbarch_deprecated_saved_pc_after_call (gdbarch, alpha_saved_pc_after_call); |
dc129d82 | 1839 | |
618ce49f | 1840 | set_gdbarch_deprecated_frame_chain (gdbarch, alpha_frame_chain); |
8bedc050 | 1841 | set_gdbarch_deprecated_frame_saved_pc (gdbarch, alpha_frame_saved_pc); |
dc129d82 | 1842 | |
f30ee0bc | 1843 | set_gdbarch_deprecated_frame_init_saved_regs (gdbarch, alpha_frame_init_saved_regs); |
dc129d82 JT |
1844 | |
1845 | set_gdbarch_use_struct_convention (gdbarch, alpha_use_struct_convention); | |
26e9b323 | 1846 | set_gdbarch_deprecated_extract_return_value (gdbarch, alpha_extract_return_value); |
dc129d82 | 1847 | |
4183d812 | 1848 | set_gdbarch_deprecated_store_struct_return (gdbarch, alpha_store_struct_return); |
ebba8386 | 1849 | set_gdbarch_deprecated_store_return_value (gdbarch, alpha_store_return_value); |
26e9b323 | 1850 | set_gdbarch_deprecated_extract_struct_value_address (gdbarch, |
dc129d82 JT |
1851 | alpha_extract_struct_value_address); |
1852 | ||
1853 | /* Settings for calling functions in the inferior. */ | |
07555a72 | 1854 | set_gdbarch_deprecated_use_generic_dummy_frames (gdbarch, 0); |
b81774d8 | 1855 | set_gdbarch_deprecated_push_arguments (gdbarch, alpha_push_arguments); |
749b82f6 | 1856 | set_gdbarch_deprecated_pop_frame (gdbarch, alpha_pop_frame); |
dc129d82 JT |
1857 | |
1858 | /* On the Alpha, the call dummy code is never copied to user space, | |
1859 | stopping the user call is achieved via a bp_call_dummy breakpoint. | |
1860 | But we need a fake CALL_DUMMY definition to enable the proper | |
1861 | call_function_by_hand and to avoid zero length array warnings. */ | |
dc129d82 JT |
1862 | set_gdbarch_call_dummy_words (gdbarch, alpha_call_dummy_words); |
1863 | set_gdbarch_sizeof_call_dummy_words (gdbarch, 0); | |
1864 | set_gdbarch_frame_args_address (gdbarch, alpha_frame_args_address); | |
1865 | set_gdbarch_frame_locals_address (gdbarch, alpha_frame_locals_address); | |
e9582e71 | 1866 | set_gdbarch_deprecated_init_extra_frame_info (gdbarch, alpha_init_extra_frame_info); |
dc129d82 JT |
1867 | |
1868 | /* Alpha OSF/1 inhibits execution of code on the stack. But there is | |
1869 | no need for a dummy on the Alpha. PUSH_ARGUMENTS takes care of all | |
1870 | argument handling and bp_call_dummy takes care of stopping the dummy. */ | |
dc129d82 | 1871 | set_gdbarch_call_dummy_address (gdbarch, alpha_call_dummy_address); |
ae45cd16 | 1872 | set_gdbarch_deprecated_pc_in_call_dummy (gdbarch, deprecated_pc_in_call_dummy_at_entry_point); |
f3824013 | 1873 | set_gdbarch_deprecated_push_dummy_frame (gdbarch, alpha_push_dummy_frame); |
6c0e89ed AC |
1874 | /* Should be using push_dummy_call. */ |
1875 | set_gdbarch_deprecated_dummy_write_sp (gdbarch, generic_target_write_sp); | |
dc129d82 | 1876 | set_gdbarch_fix_call_dummy (gdbarch, alpha_fix_call_dummy); |
a5afb99f | 1877 | set_gdbarch_deprecated_init_frame_pc (gdbarch, init_frame_pc_noop); |
2ca6c561 | 1878 | set_gdbarch_deprecated_init_frame_pc_first (gdbarch, alpha_init_frame_pc_first); |
dc129d82 JT |
1879 | |
1880 | set_gdbarch_inner_than (gdbarch, core_addr_lessthan); | |
36a6271d | 1881 | set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target); |
dc129d82 | 1882 | |
95b80706 | 1883 | set_gdbarch_breakpoint_from_pc (gdbarch, alpha_breakpoint_from_pc); |
dc129d82 | 1884 | set_gdbarch_decr_pc_after_break (gdbarch, 4); |
95b80706 JT |
1885 | |
1886 | set_gdbarch_function_start_offset (gdbarch, 0); | |
dc129d82 JT |
1887 | set_gdbarch_frame_args_skip (gdbarch, 0); |
1888 | ||
44dffaac | 1889 | /* Hook in ABI-specific overrides, if they have been registered. */ |
4be87837 | 1890 | gdbarch_init_osabi (info, gdbarch); |
44dffaac | 1891 | |
accc6d1f JT |
1892 | /* Now that we have tuned the configuration, set a few final things |
1893 | based on what the OS ABI has told us. */ | |
1894 | ||
1895 | if (tdep->jb_pc >= 0) | |
1896 | set_gdbarch_get_longjmp_target (gdbarch, alpha_get_longjmp_target); | |
1897 | ||
dc129d82 JT |
1898 | return gdbarch; |
1899 | } | |
1900 | ||
1901 | static void | |
1902 | alpha_dump_tdep (struct gdbarch *current_gdbarch, struct ui_file *file) | |
1903 | { | |
1904 | struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); | |
1905 | ||
1906 | if (tdep == NULL) | |
1907 | return; | |
1908 | ||
d9b023cc JT |
1909 | fprintf_unfiltered (file, |
1910 | "alpha_dump_tdep: vm_min_address = 0x%lx\n", | |
1911 | (long) tdep->vm_min_address); | |
accc6d1f JT |
1912 | |
1913 | fprintf_unfiltered (file, | |
1914 | "alpha_dump_tdep: jb_pc = %d\n", | |
1915 | tdep->jb_pc); | |
1916 | fprintf_unfiltered (file, | |
1917 | "alpha_dump_tdep: jb_elt_size = %ld\n", | |
1918 | (long) tdep->jb_elt_size); | |
dc129d82 JT |
1919 | } |
1920 | ||
c906108c | 1921 | void |
fba45db2 | 1922 | _initialize_alpha_tdep (void) |
c906108c SS |
1923 | { |
1924 | struct cmd_list_element *c; | |
1925 | ||
dc129d82 JT |
1926 | gdbarch_register (bfd_arch_alpha, alpha_gdbarch_init, alpha_dump_tdep); |
1927 | ||
d7a27068 | 1928 | deprecated_tm_print_insn = print_insn_alpha; |
c906108c SS |
1929 | |
1930 | /* Let the user set the fence post for heuristic_proc_start. */ | |
1931 | ||
1932 | /* We really would like to have both "0" and "unlimited" work, but | |
1933 | command.c doesn't deal with that. So make it a var_zinteger | |
1934 | because the user can always use "999999" or some such for unlimited. */ | |
1935 | c = add_set_cmd ("heuristic-fence-post", class_support, var_zinteger, | |
1936 | (char *) &heuristic_fence_post, | |
1937 | "\ | |
1938 | Set the distance searched for the start of a function.\n\ | |
1939 | If you are debugging a stripped executable, GDB needs to search through the\n\ | |
1940 | program for the start of a function. This command sets the distance of the\n\ | |
1941 | search. The only need to set it is when debugging a stripped executable.", | |
1942 | &setlist); | |
1943 | /* We need to throw away the frame cache when we set this, since it | |
1944 | might change our ability to get backtraces. */ | |
9f60d481 | 1945 | set_cmd_sfunc (c, reinit_frame_cache_sfunc); |
c906108c SS |
1946 | add_show_from_set (c, &showlist); |
1947 | } |