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7a3085c1 AC |
1 | // OBSOLETE /* Target-dependent code for the Fujitsu FR30. |
2 | // OBSOLETE Copyright 1999, 2000, 2001 Free Software Foundation, Inc. | |
3 | // OBSOLETE | |
4 | // OBSOLETE This file is part of GDB. | |
5 | // OBSOLETE | |
6 | // OBSOLETE This program is free software; you can redistribute it and/or modify | |
7 | // OBSOLETE it under the terms of the GNU General Public License as published by | |
8 | // OBSOLETE the Free Software Foundation; either version 2 of the License, or | |
9 | // OBSOLETE (at your option) any later version. | |
10 | // OBSOLETE | |
11 | // OBSOLETE This program is distributed in the hope that it will be useful, | |
12 | // OBSOLETE but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | // OBSOLETE MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | // OBSOLETE GNU General Public License for more details. | |
15 | // OBSOLETE | |
16 | // OBSOLETE You should have received a copy of the GNU General Public License | |
17 | // OBSOLETE along with this program; if not, write to the Free Software | |
18 | // OBSOLETE Foundation, Inc., 59 Temple Place - Suite 330, | |
19 | // OBSOLETE Boston, MA 02111-1307, USA. */ | |
20 | // OBSOLETE | |
21 | // OBSOLETE #include "defs.h" | |
22 | // OBSOLETE #include "frame.h" | |
23 | // OBSOLETE #include "inferior.h" | |
24 | // OBSOLETE #include "obstack.h" | |
25 | // OBSOLETE #include "target.h" | |
26 | // OBSOLETE #include "value.h" | |
27 | // OBSOLETE #include "bfd.h" | |
28 | // OBSOLETE #include "gdb_string.h" | |
29 | // OBSOLETE #include "gdbcore.h" | |
30 | // OBSOLETE #include "symfile.h" | |
31 | // OBSOLETE #include "regcache.h" | |
32 | // OBSOLETE | |
33 | // OBSOLETE /* An expression that tells us whether the function invocation represented | |
34 | // OBSOLETE by FI does not have a frame on the stack associated with it. */ | |
35 | // OBSOLETE int | |
36 | // OBSOLETE fr30_frameless_function_invocation (struct frame_info *fi) | |
37 | // OBSOLETE { | |
38 | // OBSOLETE int frameless; | |
39 | // OBSOLETE CORE_ADDR func_start, after_prologue; | |
40 | // OBSOLETE func_start = (get_pc_function_start ((fi)->pc) + | |
41 | // OBSOLETE FUNCTION_START_OFFSET); | |
42 | // OBSOLETE after_prologue = func_start; | |
43 | // OBSOLETE after_prologue = SKIP_PROLOGUE (after_prologue); | |
44 | // OBSOLETE frameless = (after_prologue == func_start); | |
45 | // OBSOLETE return frameless; | |
46 | // OBSOLETE } | |
47 | // OBSOLETE | |
48 | // OBSOLETE /* Function: pop_frame | |
49 | // OBSOLETE This routine gets called when either the user uses the `return' | |
50 | // OBSOLETE command, or the call dummy breakpoint gets hit. */ | |
51 | // OBSOLETE | |
52 | // OBSOLETE void | |
53 | // OBSOLETE fr30_pop_frame (void) | |
54 | // OBSOLETE { | |
55 | // OBSOLETE struct frame_info *frame = get_current_frame (); | |
56 | // OBSOLETE int regnum; | |
57 | // OBSOLETE CORE_ADDR sp = read_register (SP_REGNUM); | |
58 | // OBSOLETE | |
59 | // OBSOLETE if (PC_IN_CALL_DUMMY (frame->pc, frame->frame, frame->frame)) | |
60 | // OBSOLETE generic_pop_dummy_frame (); | |
61 | // OBSOLETE else | |
62 | // OBSOLETE { | |
63 | // OBSOLETE write_register (PC_REGNUM, FRAME_SAVED_PC (frame)); | |
64 | // OBSOLETE | |
65 | // OBSOLETE for (regnum = 0; regnum < NUM_REGS; regnum++) | |
66 | // OBSOLETE if (frame->fsr.regs[regnum] != 0) | |
67 | // OBSOLETE { | |
68 | // OBSOLETE write_register (regnum, | |
69 | // OBSOLETE read_memory_unsigned_integer (frame->fsr.regs[regnum], | |
70 | // OBSOLETE REGISTER_RAW_SIZE (regnum))); | |
71 | // OBSOLETE } | |
72 | // OBSOLETE write_register (SP_REGNUM, sp + frame->framesize); | |
73 | // OBSOLETE } | |
74 | // OBSOLETE flush_cached_frames (); | |
75 | // OBSOLETE } | |
76 | // OBSOLETE | |
77 | // OBSOLETE | |
78 | // OBSOLETE /* Function: fr30_store_return_value | |
79 | // OBSOLETE Put a value where a caller expects to see it. Used by the 'return' | |
80 | // OBSOLETE command. */ | |
81 | // OBSOLETE void | |
82 | // OBSOLETE fr30_store_return_value (struct type *type, | |
83 | // OBSOLETE char *valbuf) | |
84 | // OBSOLETE { | |
85 | // OBSOLETE /* Here's how the FR30 returns values (gleaned from gcc/config/ | |
86 | // OBSOLETE fr30/fr30.h): | |
87 | // OBSOLETE | |
88 | // OBSOLETE If the return value is 32 bits long or less, it goes in r4. | |
89 | // OBSOLETE | |
90 | // OBSOLETE If the return value is 64 bits long or less, it goes in r4 (most | |
91 | // OBSOLETE significant word) and r5 (least significant word. | |
92 | // OBSOLETE | |
93 | // OBSOLETE If the function returns a structure, of any size, the caller | |
94 | // OBSOLETE passes the function an invisible first argument where the callee | |
95 | // OBSOLETE should store the value. But GDB doesn't let you do that anyway. | |
96 | // OBSOLETE | |
97 | // OBSOLETE If you're returning a value smaller than a word, it's not really | |
98 | // OBSOLETE necessary to zero the upper bytes of the register; the caller is | |
99 | // OBSOLETE supposed to ignore them. However, the FR30 typically keeps its | |
100 | // OBSOLETE values extended to the full register width, so we should emulate | |
101 | // OBSOLETE that. */ | |
102 | // OBSOLETE | |
103 | // OBSOLETE /* The FR30 is big-endian, so if we return a small value (like a | |
104 | // OBSOLETE short or a char), we need to position it correctly within the | |
105 | // OBSOLETE register. We round the size up to a register boundary, and then | |
106 | // OBSOLETE adjust the offset so as to place the value at the right end. */ | |
107 | // OBSOLETE int value_size = TYPE_LENGTH (type); | |
108 | // OBSOLETE int returned_size = (value_size + FR30_REGSIZE - 1) & ~(FR30_REGSIZE - 1); | |
109 | // OBSOLETE int offset = (REGISTER_BYTE (RETVAL_REG) | |
110 | // OBSOLETE + (returned_size - value_size)); | |
111 | // OBSOLETE char *zeros = alloca (returned_size); | |
112 | // OBSOLETE memset (zeros, 0, returned_size); | |
113 | // OBSOLETE | |
114 | // OBSOLETE write_register_bytes (REGISTER_BYTE (RETVAL_REG), zeros, returned_size); | |
115 | // OBSOLETE write_register_bytes (offset, valbuf, value_size); | |
116 | // OBSOLETE } | |
117 | // OBSOLETE | |
118 | // OBSOLETE | |
119 | // OBSOLETE /* Function: skip_prologue | |
120 | // OBSOLETE Return the address of the first code past the prologue of the function. */ | |
121 | // OBSOLETE | |
122 | // OBSOLETE CORE_ADDR | |
123 | // OBSOLETE fr30_skip_prologue (CORE_ADDR pc) | |
124 | // OBSOLETE { | |
125 | // OBSOLETE CORE_ADDR func_addr, func_end; | |
126 | // OBSOLETE | |
127 | // OBSOLETE /* See what the symbol table says */ | |
128 | // OBSOLETE | |
129 | // OBSOLETE if (find_pc_partial_function (pc, NULL, &func_addr, &func_end)) | |
130 | // OBSOLETE { | |
131 | // OBSOLETE struct symtab_and_line sal; | |
132 | // OBSOLETE | |
133 | // OBSOLETE sal = find_pc_line (func_addr, 0); | |
134 | // OBSOLETE | |
135 | // OBSOLETE if (sal.line != 0 && sal.end < func_end) | |
136 | // OBSOLETE { | |
137 | // OBSOLETE return sal.end; | |
138 | // OBSOLETE } | |
139 | // OBSOLETE } | |
140 | // OBSOLETE | |
141 | // OBSOLETE /* Either we didn't find the start of this function (nothing we can do), | |
142 | // OBSOLETE or there's no line info, or the line after the prologue is after | |
143 | // OBSOLETE the end of the function (there probably isn't a prologue). */ | |
144 | // OBSOLETE | |
145 | // OBSOLETE return pc; | |
146 | // OBSOLETE } | |
147 | // OBSOLETE | |
148 | // OBSOLETE | |
149 | // OBSOLETE /* Function: push_arguments | |
150 | // OBSOLETE Setup arguments and RP for a call to the target. First four args | |
151 | // OBSOLETE go in FIRST_ARGREG -> LAST_ARGREG, subsequent args go on stack... | |
152 | // OBSOLETE Structs are passed by reference. XXX not right now Z.R. | |
153 | // OBSOLETE 64 bit quantities (doubles and long longs) may be split between | |
154 | // OBSOLETE the regs and the stack. | |
155 | // OBSOLETE When calling a function that returns a struct, a pointer to the struct | |
156 | // OBSOLETE is passed in as a secret first argument (always in FIRST_ARGREG). | |
157 | // OBSOLETE | |
158 | // OBSOLETE Stack space for the args has NOT been allocated: that job is up to us. | |
159 | // OBSOLETE */ | |
160 | // OBSOLETE | |
161 | // OBSOLETE CORE_ADDR | |
162 | // OBSOLETE fr30_push_arguments (int nargs, struct value **args, CORE_ADDR sp, | |
163 | // OBSOLETE int struct_return, CORE_ADDR struct_addr) | |
164 | // OBSOLETE { | |
165 | // OBSOLETE int argreg; | |
166 | // OBSOLETE int argnum; | |
167 | // OBSOLETE int stack_offset; | |
168 | // OBSOLETE struct stack_arg | |
169 | // OBSOLETE { | |
170 | // OBSOLETE char *val; | |
171 | // OBSOLETE int len; | |
172 | // OBSOLETE int offset; | |
173 | // OBSOLETE }; | |
174 | // OBSOLETE struct stack_arg *stack_args = | |
175 | // OBSOLETE (struct stack_arg *) alloca (nargs * sizeof (struct stack_arg)); | |
176 | // OBSOLETE int nstack_args = 0; | |
177 | // OBSOLETE | |
178 | // OBSOLETE argreg = FIRST_ARGREG; | |
179 | // OBSOLETE | |
180 | // OBSOLETE /* the struct_return pointer occupies the first parameter-passing reg */ | |
181 | // OBSOLETE if (struct_return) | |
182 | // OBSOLETE write_register (argreg++, struct_addr); | |
183 | // OBSOLETE | |
184 | // OBSOLETE stack_offset = 0; | |
185 | // OBSOLETE | |
186 | // OBSOLETE /* Process args from left to right. Store as many as allowed in | |
187 | // OBSOLETE registers, save the rest to be pushed on the stack */ | |
188 | // OBSOLETE for (argnum = 0; argnum < nargs; argnum++) | |
189 | // OBSOLETE { | |
190 | // OBSOLETE char *val; | |
191 | // OBSOLETE struct value *arg = args[argnum]; | |
192 | // OBSOLETE struct type *arg_type = check_typedef (VALUE_TYPE (arg)); | |
193 | // OBSOLETE struct type *target_type = TYPE_TARGET_TYPE (arg_type); | |
194 | // OBSOLETE int len = TYPE_LENGTH (arg_type); | |
195 | // OBSOLETE enum type_code typecode = TYPE_CODE (arg_type); | |
196 | // OBSOLETE CORE_ADDR regval; | |
197 | // OBSOLETE int newarg; | |
198 | // OBSOLETE | |
199 | // OBSOLETE val = (char *) VALUE_CONTENTS (arg); | |
200 | // OBSOLETE | |
201 | // OBSOLETE { | |
202 | // OBSOLETE /* Copy the argument to general registers or the stack in | |
203 | // OBSOLETE register-sized pieces. Large arguments are split between | |
204 | // OBSOLETE registers and stack. */ | |
205 | // OBSOLETE while (len > 0) | |
206 | // OBSOLETE { | |
207 | // OBSOLETE if (argreg <= LAST_ARGREG) | |
208 | // OBSOLETE { | |
209 | // OBSOLETE int partial_len = len < REGISTER_SIZE ? len : REGISTER_SIZE; | |
210 | // OBSOLETE regval = extract_address (val, partial_len); | |
211 | // OBSOLETE | |
212 | // OBSOLETE /* It's a simple argument being passed in a general | |
213 | // OBSOLETE register. */ | |
214 | // OBSOLETE write_register (argreg, regval); | |
215 | // OBSOLETE argreg++; | |
216 | // OBSOLETE len -= partial_len; | |
217 | // OBSOLETE val += partial_len; | |
218 | // OBSOLETE } | |
219 | // OBSOLETE else | |
220 | // OBSOLETE { | |
221 | // OBSOLETE /* keep for later pushing */ | |
222 | // OBSOLETE stack_args[nstack_args].val = val; | |
223 | // OBSOLETE stack_args[nstack_args++].len = len; | |
224 | // OBSOLETE break; | |
225 | // OBSOLETE } | |
226 | // OBSOLETE } | |
227 | // OBSOLETE } | |
228 | // OBSOLETE } | |
229 | // OBSOLETE /* now do the real stack pushing, process args right to left */ | |
230 | // OBSOLETE while (nstack_args--) | |
231 | // OBSOLETE { | |
232 | // OBSOLETE sp -= stack_args[nstack_args].len; | |
233 | // OBSOLETE write_memory (sp, stack_args[nstack_args].val, | |
234 | // OBSOLETE stack_args[nstack_args].len); | |
235 | // OBSOLETE } | |
236 | // OBSOLETE | |
237 | // OBSOLETE /* Return adjusted stack pointer. */ | |
238 | // OBSOLETE return sp; | |
239 | // OBSOLETE } | |
240 | // OBSOLETE | |
241 | // OBSOLETE void _initialize_fr30_tdep (void); | |
242 | // OBSOLETE | |
243 | // OBSOLETE void | |
244 | // OBSOLETE _initialize_fr30_tdep (void) | |
245 | // OBSOLETE { | |
246 | // OBSOLETE extern int print_insn_fr30 (bfd_vma, disassemble_info *); | |
247 | // OBSOLETE tm_print_insn = print_insn_fr30; | |
248 | // OBSOLETE } | |
249 | // OBSOLETE | |
250 | // OBSOLETE /* Function: check_prologue_cache | |
251 | // OBSOLETE Check if prologue for this frame's PC has already been scanned. | |
252 | // OBSOLETE If it has, copy the relevant information about that prologue and | |
253 | // OBSOLETE return non-zero. Otherwise do not copy anything and return zero. | |
254 | // OBSOLETE | |
255 | // OBSOLETE The information saved in the cache includes: | |
256 | // OBSOLETE * the frame register number; | |
257 | // OBSOLETE * the size of the stack frame; | |
258 | // OBSOLETE * the offsets of saved regs (relative to the old SP); and | |
259 | // OBSOLETE * the offset from the stack pointer to the frame pointer | |
260 | // OBSOLETE | |
261 | // OBSOLETE The cache contains only one entry, since this is adequate | |
262 | // OBSOLETE for the typical sequence of prologue scan requests we get. | |
263 | // OBSOLETE When performing a backtrace, GDB will usually ask to scan | |
264 | // OBSOLETE the same function twice in a row (once to get the frame chain, | |
265 | // OBSOLETE and once to fill in the extra frame information). | |
266 | // OBSOLETE */ | |
267 | // OBSOLETE | |
268 | // OBSOLETE static struct frame_info prologue_cache; | |
269 | // OBSOLETE | |
270 | // OBSOLETE static int | |
271 | // OBSOLETE check_prologue_cache (struct frame_info *fi) | |
272 | // OBSOLETE { | |
273 | // OBSOLETE int i; | |
274 | // OBSOLETE | |
275 | // OBSOLETE if (fi->pc == prologue_cache.pc) | |
276 | // OBSOLETE { | |
277 | // OBSOLETE fi->framereg = prologue_cache.framereg; | |
278 | // OBSOLETE fi->framesize = prologue_cache.framesize; | |
279 | // OBSOLETE fi->frameoffset = prologue_cache.frameoffset; | |
280 | // OBSOLETE for (i = 0; i <= NUM_REGS; i++) | |
281 | // OBSOLETE fi->fsr.regs[i] = prologue_cache.fsr.regs[i]; | |
282 | // OBSOLETE return 1; | |
283 | // OBSOLETE } | |
284 | // OBSOLETE else | |
285 | // OBSOLETE return 0; | |
286 | // OBSOLETE } | |
287 | // OBSOLETE | |
288 | // OBSOLETE | |
289 | // OBSOLETE /* Function: save_prologue_cache | |
290 | // OBSOLETE Copy the prologue information from fi to the prologue cache. | |
291 | // OBSOLETE */ | |
292 | // OBSOLETE | |
293 | // OBSOLETE static void | |
294 | // OBSOLETE save_prologue_cache (struct frame_info *fi) | |
295 | // OBSOLETE { | |
296 | // OBSOLETE int i; | |
297 | // OBSOLETE | |
298 | // OBSOLETE prologue_cache.pc = fi->pc; | |
299 | // OBSOLETE prologue_cache.framereg = fi->framereg; | |
300 | // OBSOLETE prologue_cache.framesize = fi->framesize; | |
301 | // OBSOLETE prologue_cache.frameoffset = fi->frameoffset; | |
302 | // OBSOLETE | |
303 | // OBSOLETE for (i = 0; i <= NUM_REGS; i++) | |
304 | // OBSOLETE { | |
305 | // OBSOLETE prologue_cache.fsr.regs[i] = fi->fsr.regs[i]; | |
306 | // OBSOLETE } | |
307 | // OBSOLETE } | |
308 | // OBSOLETE | |
309 | // OBSOLETE | |
310 | // OBSOLETE /* Function: scan_prologue | |
311 | // OBSOLETE Scan the prologue of the function that contains PC, and record what | |
312 | // OBSOLETE we find in PI. PI->fsr must be zeroed by the called. Returns the | |
313 | // OBSOLETE pc after the prologue. Note that the addresses saved in pi->fsr | |
314 | // OBSOLETE are actually just frame relative (negative offsets from the frame | |
315 | // OBSOLETE pointer). This is because we don't know the actual value of the | |
316 | // OBSOLETE frame pointer yet. In some circumstances, the frame pointer can't | |
317 | // OBSOLETE be determined till after we have scanned the prologue. */ | |
318 | // OBSOLETE | |
319 | // OBSOLETE static void | |
320 | // OBSOLETE fr30_scan_prologue (struct frame_info *fi) | |
321 | // OBSOLETE { | |
322 | // OBSOLETE int sp_offset, fp_offset; | |
323 | // OBSOLETE CORE_ADDR prologue_start, prologue_end, current_pc; | |
324 | // OBSOLETE | |
325 | // OBSOLETE /* Check if this function is already in the cache of frame information. */ | |
326 | // OBSOLETE if (check_prologue_cache (fi)) | |
327 | // OBSOLETE return; | |
328 | // OBSOLETE | |
329 | // OBSOLETE /* Assume there is no frame until proven otherwise. */ | |
330 | // OBSOLETE fi->framereg = SP_REGNUM; | |
331 | // OBSOLETE fi->framesize = 0; | |
332 | // OBSOLETE fi->frameoffset = 0; | |
333 | // OBSOLETE | |
334 | // OBSOLETE /* Find the function prologue. If we can't find the function in | |
335 | // OBSOLETE the symbol table, peek in the stack frame to find the PC. */ | |
336 | // OBSOLETE if (find_pc_partial_function (fi->pc, NULL, &prologue_start, &prologue_end)) | |
337 | // OBSOLETE { | |
338 | // OBSOLETE /* Assume the prologue is everything between the first instruction | |
339 | // OBSOLETE in the function and the first source line. */ | |
340 | // OBSOLETE struct symtab_and_line sal = find_pc_line (prologue_start, 0); | |
341 | // OBSOLETE | |
342 | // OBSOLETE if (sal.line == 0) /* no line info, use current PC */ | |
343 | // OBSOLETE prologue_end = fi->pc; | |
344 | // OBSOLETE else if (sal.end < prologue_end) /* next line begins after fn end */ | |
345 | // OBSOLETE prologue_end = sal.end; /* (probably means no prologue) */ | |
346 | // OBSOLETE } | |
347 | // OBSOLETE else | |
348 | // OBSOLETE { | |
349 | // OBSOLETE /* XXX Z.R. What now??? The following is entirely bogus */ | |
350 | // OBSOLETE prologue_start = (read_memory_integer (fi->frame, 4) & 0x03fffffc) - 12; | |
351 | // OBSOLETE prologue_end = prologue_start + 40; | |
352 | // OBSOLETE } | |
353 | // OBSOLETE | |
354 | // OBSOLETE /* Now search the prologue looking for instructions that set up the | |
355 | // OBSOLETE frame pointer, adjust the stack pointer, and save registers. */ | |
356 | // OBSOLETE | |
357 | // OBSOLETE sp_offset = fp_offset = 0; | |
358 | // OBSOLETE for (current_pc = prologue_start; current_pc < prologue_end; current_pc += 2) | |
359 | // OBSOLETE { | |
360 | // OBSOLETE unsigned int insn; | |
361 | // OBSOLETE | |
362 | // OBSOLETE insn = read_memory_unsigned_integer (current_pc, 2); | |
363 | // OBSOLETE | |
364 | // OBSOLETE if ((insn & 0xfe00) == 0x8e00) /* stm0 or stm1 */ | |
365 | // OBSOLETE { | |
366 | // OBSOLETE int reg, mask = insn & 0xff; | |
367 | // OBSOLETE | |
368 | // OBSOLETE /* scan in one sweep - create virtual 16-bit mask from either insn's mask */ | |
369 | // OBSOLETE if ((insn & 0x0100) == 0) | |
370 | // OBSOLETE { | |
371 | // OBSOLETE mask <<= 8; /* stm0 - move to upper byte in virtual mask */ | |
372 | // OBSOLETE } | |
373 | // OBSOLETE | |
374 | // OBSOLETE /* Calculate offsets of saved registers (to be turned later into addresses). */ | |
375 | // OBSOLETE for (reg = R4_REGNUM; reg <= R11_REGNUM; reg++) | |
376 | // OBSOLETE if (mask & (1 << (15 - reg))) | |
377 | // OBSOLETE { | |
378 | // OBSOLETE sp_offset -= 4; | |
379 | // OBSOLETE fi->fsr.regs[reg] = sp_offset; | |
380 | // OBSOLETE } | |
381 | // OBSOLETE } | |
382 | // OBSOLETE else if ((insn & 0xfff0) == 0x1700) /* st rx,@-r15 */ | |
383 | // OBSOLETE { | |
384 | // OBSOLETE int reg = insn & 0xf; | |
385 | // OBSOLETE | |
386 | // OBSOLETE sp_offset -= 4; | |
387 | // OBSOLETE fi->fsr.regs[reg] = sp_offset; | |
388 | // OBSOLETE } | |
389 | // OBSOLETE else if ((insn & 0xff00) == 0x0f00) /* enter */ | |
390 | // OBSOLETE { | |
391 | // OBSOLETE fp_offset = fi->fsr.regs[FP_REGNUM] = sp_offset - 4; | |
392 | // OBSOLETE sp_offset -= 4 * (insn & 0xff); | |
393 | // OBSOLETE fi->framereg = FP_REGNUM; | |
394 | // OBSOLETE } | |
395 | // OBSOLETE else if (insn == 0x1781) /* st rp,@-sp */ | |
396 | // OBSOLETE { | |
397 | // OBSOLETE sp_offset -= 4; | |
398 | // OBSOLETE fi->fsr.regs[RP_REGNUM] = sp_offset; | |
399 | // OBSOLETE } | |
400 | // OBSOLETE else if (insn == 0x170e) /* st fp,@-sp */ | |
401 | // OBSOLETE { | |
402 | // OBSOLETE sp_offset -= 4; | |
403 | // OBSOLETE fi->fsr.regs[FP_REGNUM] = sp_offset; | |
404 | // OBSOLETE } | |
405 | // OBSOLETE else if (insn == 0x8bfe) /* mov sp,fp */ | |
406 | // OBSOLETE { | |
407 | // OBSOLETE fi->framereg = FP_REGNUM; | |
408 | // OBSOLETE } | |
409 | // OBSOLETE else if ((insn & 0xff00) == 0xa300) /* addsp xx */ | |
410 | // OBSOLETE { | |
411 | // OBSOLETE sp_offset += 4 * (signed char) (insn & 0xff); | |
412 | // OBSOLETE } | |
413 | // OBSOLETE else if ((insn & 0xff0f) == 0x9b00 && /* ldi:20 xx,r0 */ | |
414 | // OBSOLETE read_memory_unsigned_integer (current_pc + 4, 2) | |
415 | // OBSOLETE == 0xac0f) /* sub r0,sp */ | |
416 | // OBSOLETE { | |
417 | // OBSOLETE /* large stack adjustment */ | |
418 | // OBSOLETE sp_offset -= (((insn & 0xf0) << 12) | read_memory_unsigned_integer (current_pc + 2, 2)); | |
419 | // OBSOLETE current_pc += 4; | |
420 | // OBSOLETE } | |
421 | // OBSOLETE else if (insn == 0x9f80 && /* ldi:32 xx,r0 */ | |
422 | // OBSOLETE read_memory_unsigned_integer (current_pc + 6, 2) | |
423 | // OBSOLETE == 0xac0f) /* sub r0,sp */ | |
424 | // OBSOLETE { | |
425 | // OBSOLETE /* large stack adjustment */ | |
426 | // OBSOLETE sp_offset -= | |
427 | // OBSOLETE (read_memory_unsigned_integer (current_pc + 2, 2) << 16 | | |
428 | // OBSOLETE read_memory_unsigned_integer (current_pc + 4, 2)); | |
429 | // OBSOLETE current_pc += 6; | |
430 | // OBSOLETE } | |
431 | // OBSOLETE } | |
432 | // OBSOLETE | |
433 | // OBSOLETE /* The frame size is just the negative of the offset (from the original SP) | |
434 | // OBSOLETE of the last thing thing we pushed on the stack. The frame offset is | |
435 | // OBSOLETE [new FP] - [new SP]. */ | |
436 | // OBSOLETE fi->framesize = -sp_offset; | |
437 | // OBSOLETE fi->frameoffset = fp_offset - sp_offset; | |
438 | // OBSOLETE | |
439 | // OBSOLETE save_prologue_cache (fi); | |
440 | // OBSOLETE } | |
441 | // OBSOLETE | |
442 | // OBSOLETE /* Function: init_extra_frame_info | |
443 | // OBSOLETE Setup the frame's frame pointer, pc, and frame addresses for saved | |
444 | // OBSOLETE registers. Most of the work is done in scan_prologue(). | |
445 | // OBSOLETE | |
446 | // OBSOLETE Note that when we are called for the last frame (currently active frame), | |
447 | // OBSOLETE that fi->pc and fi->frame will already be setup. However, fi->frame will | |
448 | // OBSOLETE be valid only if this routine uses FP. For previous frames, fi-frame will | |
449 | // OBSOLETE always be correct (since that is derived from fr30_frame_chain ()). | |
450 | // OBSOLETE | |
451 | // OBSOLETE We can be called with the PC in the call dummy under two circumstances. | |
452 | // OBSOLETE First, during normal backtracing, second, while figuring out the frame | |
453 | // OBSOLETE pointer just prior to calling the target function (see run_stack_dummy). */ | |
454 | // OBSOLETE | |
455 | // OBSOLETE void | |
456 | // OBSOLETE fr30_init_extra_frame_info (struct frame_info *fi) | |
457 | // OBSOLETE { | |
458 | // OBSOLETE int reg; | |
459 | // OBSOLETE | |
460 | // OBSOLETE if (fi->next) | |
461 | // OBSOLETE fi->pc = FRAME_SAVED_PC (fi->next); | |
462 | // OBSOLETE | |
463 | // OBSOLETE memset (fi->fsr.regs, '\000', sizeof fi->fsr.regs); | |
464 | // OBSOLETE | |
465 | // OBSOLETE if (PC_IN_CALL_DUMMY (fi->pc, fi->frame, fi->frame)) | |
466 | // OBSOLETE { | |
467 | // OBSOLETE /* We need to setup fi->frame here because run_stack_dummy gets it wrong | |
468 | // OBSOLETE by assuming it's always FP. */ | |
469 | // OBSOLETE fi->frame = generic_read_register_dummy (fi->pc, fi->frame, SP_REGNUM); | |
470 | // OBSOLETE fi->framesize = 0; | |
471 | // OBSOLETE fi->frameoffset = 0; | |
472 | // OBSOLETE return; | |
473 | // OBSOLETE } | |
474 | // OBSOLETE fr30_scan_prologue (fi); | |
475 | // OBSOLETE | |
476 | // OBSOLETE if (!fi->next) /* this is the innermost frame? */ | |
477 | // OBSOLETE fi->frame = read_register (fi->framereg); | |
478 | // OBSOLETE else | |
479 | // OBSOLETE /* not the innermost frame */ | |
480 | // OBSOLETE /* If we have an FP, the callee saved it. */ | |
481 | // OBSOLETE if (fi->framereg == FP_REGNUM) | |
482 | // OBSOLETE if (fi->next->fsr.regs[fi->framereg] != 0) | |
483 | // OBSOLETE fi->frame = read_memory_integer (fi->next->fsr.regs[fi->framereg], 4); | |
484 | // OBSOLETE | |
485 | // OBSOLETE /* Calculate actual addresses of saved registers using offsets determined | |
486 | // OBSOLETE by fr30_scan_prologue. */ | |
487 | // OBSOLETE for (reg = 0; reg < NUM_REGS; reg++) | |
488 | // OBSOLETE if (fi->fsr.regs[reg] != 0) | |
489 | // OBSOLETE { | |
490 | // OBSOLETE fi->fsr.regs[reg] += fi->frame + fi->framesize - fi->frameoffset; | |
491 | // OBSOLETE } | |
492 | // OBSOLETE } | |
493 | // OBSOLETE | |
494 | // OBSOLETE /* Function: find_callers_reg | |
495 | // OBSOLETE Find REGNUM on the stack. Otherwise, it's in an active register. | |
496 | // OBSOLETE One thing we might want to do here is to check REGNUM against the | |
497 | // OBSOLETE clobber mask, and somehow flag it as invalid if it isn't saved on | |
498 | // OBSOLETE the stack somewhere. This would provide a graceful failure mode | |
499 | // OBSOLETE when trying to get the value of caller-saves registers for an inner | |
500 | // OBSOLETE frame. */ | |
501 | // OBSOLETE | |
502 | // OBSOLETE CORE_ADDR | |
503 | // OBSOLETE fr30_find_callers_reg (struct frame_info *fi, int regnum) | |
504 | // OBSOLETE { | |
505 | // OBSOLETE for (; fi; fi = fi->next) | |
506 | // OBSOLETE if (PC_IN_CALL_DUMMY (fi->pc, fi->frame, fi->frame)) | |
507 | // OBSOLETE return generic_read_register_dummy (fi->pc, fi->frame, regnum); | |
508 | // OBSOLETE else if (fi->fsr.regs[regnum] != 0) | |
509 | // OBSOLETE return read_memory_unsigned_integer (fi->fsr.regs[regnum], | |
510 | // OBSOLETE REGISTER_RAW_SIZE (regnum)); | |
511 | // OBSOLETE | |
512 | // OBSOLETE return read_register (regnum); | |
513 | // OBSOLETE } | |
514 | // OBSOLETE | |
515 | // OBSOLETE | |
516 | // OBSOLETE /* Function: frame_chain | |
517 | // OBSOLETE Figure out the frame prior to FI. Unfortunately, this involves | |
518 | // OBSOLETE scanning the prologue of the caller, which will also be done | |
519 | // OBSOLETE shortly by fr30_init_extra_frame_info. For the dummy frame, we | |
520 | // OBSOLETE just return the stack pointer that was in use at the time the | |
521 | // OBSOLETE function call was made. */ | |
522 | // OBSOLETE | |
523 | // OBSOLETE | |
524 | // OBSOLETE CORE_ADDR | |
525 | // OBSOLETE fr30_frame_chain (struct frame_info *fi) | |
526 | // OBSOLETE { | |
527 | // OBSOLETE CORE_ADDR fn_start, callers_pc, fp; | |
528 | // OBSOLETE struct frame_info caller_fi; | |
529 | // OBSOLETE int framereg; | |
530 | // OBSOLETE | |
531 | // OBSOLETE /* is this a dummy frame? */ | |
532 | // OBSOLETE if (PC_IN_CALL_DUMMY (fi->pc, fi->frame, fi->frame)) | |
533 | // OBSOLETE return fi->frame; /* dummy frame same as caller's frame */ | |
534 | // OBSOLETE | |
535 | // OBSOLETE /* is caller-of-this a dummy frame? */ | |
536 | // OBSOLETE callers_pc = FRAME_SAVED_PC (fi); /* find out who called us: */ | |
537 | // OBSOLETE fp = fr30_find_callers_reg (fi, FP_REGNUM); | |
538 | // OBSOLETE if (PC_IN_CALL_DUMMY (callers_pc, fp, fp)) | |
539 | // OBSOLETE return fp; /* dummy frame's frame may bear no relation to ours */ | |
540 | // OBSOLETE | |
541 | // OBSOLETE if (find_pc_partial_function (fi->pc, 0, &fn_start, 0)) | |
542 | // OBSOLETE if (fn_start == entry_point_address ()) | |
543 | // OBSOLETE return 0; /* in _start fn, don't chain further */ | |
544 | // OBSOLETE | |
545 | // OBSOLETE framereg = fi->framereg; | |
546 | // OBSOLETE | |
547 | // OBSOLETE /* If the caller is the startup code, we're at the end of the chain. */ | |
548 | // OBSOLETE if (find_pc_partial_function (callers_pc, 0, &fn_start, 0)) | |
549 | // OBSOLETE if (fn_start == entry_point_address ()) | |
550 | // OBSOLETE return 0; | |
551 | // OBSOLETE | |
552 | // OBSOLETE memset (&caller_fi, 0, sizeof (caller_fi)); | |
553 | // OBSOLETE caller_fi.pc = callers_pc; | |
554 | // OBSOLETE fr30_scan_prologue (&caller_fi); | |
555 | // OBSOLETE framereg = caller_fi.framereg; | |
556 | // OBSOLETE | |
557 | // OBSOLETE /* If the caller used a frame register, return its value. | |
558 | // OBSOLETE Otherwise, return the caller's stack pointer. */ | |
559 | // OBSOLETE if (framereg == FP_REGNUM) | |
560 | // OBSOLETE return fr30_find_callers_reg (fi, framereg); | |
561 | // OBSOLETE else | |
562 | // OBSOLETE return fi->frame + fi->framesize; | |
563 | // OBSOLETE } | |
564 | // OBSOLETE | |
565 | // OBSOLETE /* Function: frame_saved_pc | |
566 | // OBSOLETE Find the caller of this frame. We do this by seeing if RP_REGNUM | |
567 | // OBSOLETE is saved in the stack anywhere, otherwise we get it from the | |
568 | // OBSOLETE registers. If the inner frame is a dummy frame, return its PC | |
569 | // OBSOLETE instead of RP, because that's where "caller" of the dummy-frame | |
570 | // OBSOLETE will be found. */ | |
571 | // OBSOLETE | |
572 | // OBSOLETE CORE_ADDR | |
573 | // OBSOLETE fr30_frame_saved_pc (struct frame_info *fi) | |
574 | // OBSOLETE { | |
575 | // OBSOLETE if (PC_IN_CALL_DUMMY (fi->pc, fi->frame, fi->frame)) | |
576 | // OBSOLETE return generic_read_register_dummy (fi->pc, fi->frame, PC_REGNUM); | |
577 | // OBSOLETE else | |
578 | // OBSOLETE return fr30_find_callers_reg (fi, RP_REGNUM); | |
579 | // OBSOLETE } | |
580 | // OBSOLETE | |
581 | // OBSOLETE /* Function: fix_call_dummy | |
582 | // OBSOLETE Pokes the callee function's address into the CALL_DUMMY assembly stub. | |
583 | // OBSOLETE Assumes that the CALL_DUMMY looks like this: | |
584 | // OBSOLETE jarl <offset24>, r31 | |
585 | // OBSOLETE trap | |
586 | // OBSOLETE */ | |
587 | // OBSOLETE | |
588 | // OBSOLETE int | |
589 | // OBSOLETE fr30_fix_call_dummy (char *dummy, CORE_ADDR sp, CORE_ADDR fun, int nargs, | |
590 | // OBSOLETE struct value **args, struct type *type, int gcc_p) | |
591 | // OBSOLETE { | |
592 | // OBSOLETE long offset24; | |
593 | // OBSOLETE | |
594 | // OBSOLETE offset24 = (long) fun - (long) entry_point_address (); | |
595 | // OBSOLETE offset24 &= 0x3fffff; | |
596 | // OBSOLETE offset24 |= 0xff800000; /* jarl <offset24>, r31 */ | |
597 | // OBSOLETE | |
598 | // OBSOLETE store_unsigned_integer ((unsigned int *) &dummy[2], 2, offset24 & 0xffff); | |
599 | // OBSOLETE store_unsigned_integer ((unsigned int *) &dummy[0], 2, offset24 >> 16); | |
600 | // OBSOLETE return 0; | |
601 | // OBSOLETE } |