Commit | Line | Data |
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c906108c | 1 | /* Target-dependent code for the Matsushita MN10300 for GDB, the GNU debugger. |
cda5a58a | 2 | |
51603483 | 3 | Copyright 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003 Free Software |
cda5a58a | 4 | Foundation, Inc. |
c906108c | 5 | |
c5aa993b | 6 | This file is part of GDB. |
c906108c | 7 | |
c5aa993b JM |
8 | This program is free software; you can redistribute it and/or modify |
9 | it under the terms of the GNU General Public License as published by | |
10 | the Free Software Foundation; either version 2 of the License, or | |
11 | (at your option) any later version. | |
c906108c | 12 | |
c5aa993b JM |
13 | This program is distributed in the hope that it will be useful, |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
c906108c | 17 | |
c5aa993b JM |
18 | You should have received a copy of the GNU General Public License |
19 | along with this program; if not, write to the Free Software | |
20 | Foundation, Inc., 59 Temple Place - Suite 330, | |
21 | Boston, MA 02111-1307, USA. */ | |
c906108c SS |
22 | |
23 | #include "defs.h" | |
24 | #include "frame.h" | |
25 | #include "inferior.h" | |
c906108c SS |
26 | #include "target.h" |
27 | #include "value.h" | |
28 | #include "bfd.h" | |
29 | #include "gdb_string.h" | |
30 | #include "gdbcore.h" | |
31 | #include "symfile.h" | |
4e052eda | 32 | #include "regcache.h" |
ad8fe2ce | 33 | #include "arch-utils.h" |
bd1ce8ba | 34 | #include "gdb_assert.h" |
a89aa300 | 35 | #include "dis-asm.h" |
c906108c | 36 | |
6ca173e3 AC |
37 | #define D0_REGNUM 0 |
38 | #define D2_REGNUM 2 | |
39 | #define D3_REGNUM 3 | |
40 | #define A0_REGNUM 4 | |
41 | #define A2_REGNUM 6 | |
42 | #define A3_REGNUM 7 | |
43 | #define MDR_REGNUM 10 | |
44 | #define PSW_REGNUM 11 | |
45 | #define LIR_REGNUM 12 | |
46 | #define LAR_REGNUM 13 | |
47 | #define MDRQ_REGNUM 14 | |
48 | #define E0_REGNUM 15 | |
49 | #define MCRH_REGNUM 26 | |
50 | #define MCRL_REGNUM 27 | |
51 | #define MCVF_REGNUM 28 | |
52 | ||
53 | enum movm_register_bits { | |
54 | movm_exother_bit = 0x01, | |
55 | movm_exreg1_bit = 0x02, | |
56 | movm_exreg0_bit = 0x04, | |
57 | movm_other_bit = 0x08, | |
58 | movm_a3_bit = 0x10, | |
59 | movm_a2_bit = 0x20, | |
60 | movm_d3_bit = 0x40, | |
61 | movm_d2_bit = 0x80 | |
62 | }; | |
63 | ||
c2c6d25f | 64 | extern void _initialize_mn10300_tdep (void); |
a14ed312 KB |
65 | static CORE_ADDR mn10300_analyze_prologue (struct frame_info *fi, |
66 | CORE_ADDR pc); | |
c906108c | 67 | |
91225883 AC |
68 | /* mn10300 private data */ |
69 | struct gdbarch_tdep | |
70 | { | |
71 | int am33_mode; | |
72 | #define AM33_MODE (gdbarch_tdep (current_gdbarch)->am33_mode) | |
73 | }; | |
74 | ||
c906108c SS |
75 | /* Additional info used by the frame */ |
76 | ||
77 | struct frame_extra_info | |
c5aa993b JM |
78 | { |
79 | int status; | |
80 | int stack_size; | |
81 | }; | |
c906108c | 82 | |
0f71a2f6 | 83 | |
91225883 AC |
84 | static char * |
85 | register_name (int reg, char **regs, long sizeof_regs) | |
c2d11a7d | 86 | { |
91225883 AC |
87 | if (reg < 0 || reg >= sizeof_regs / sizeof (regs[0])) |
88 | return NULL; | |
89 | else | |
90 | return regs[reg]; | |
91 | } | |
92 | ||
fa88f677 | 93 | static const char * |
91225883 | 94 | mn10300_generic_register_name (int reg) |
0f71a2f6 | 95 | { |
91225883 AC |
96 | static char *regs[] = |
97 | { "d0", "d1", "d2", "d3", "a0", "a1", "a2", "a3", | |
98 | "sp", "pc", "mdr", "psw", "lir", "lar", "", "", | |
99 | "", "", "", "", "", "", "", "", | |
100 | "", "", "", "", "", "", "", "fp" | |
101 | }; | |
102 | return register_name (reg, regs, sizeof regs); | |
0f71a2f6 JM |
103 | } |
104 | ||
91225883 | 105 | |
fa88f677 | 106 | static const char * |
91225883 AC |
107 | am33_register_name (int reg) |
108 | { | |
109 | static char *regs[] = | |
110 | { "d0", "d1", "d2", "d3", "a0", "a1", "a2", "a3", | |
111 | "sp", "pc", "mdr", "psw", "lir", "lar", "", | |
112 | "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", | |
113 | "ssp", "msp", "usp", "mcrh", "mcrl", "mcvf", "", "", "" | |
114 | }; | |
115 | return register_name (reg, regs, sizeof regs); | |
116 | } | |
117 | ||
2ac51b36 | 118 | static CORE_ADDR |
fba45db2 | 119 | mn10300_saved_pc_after_call (struct frame_info *fi) |
0f71a2f6 JM |
120 | { |
121 | return read_memory_integer (read_register (SP_REGNUM), 4); | |
122 | } | |
123 | ||
c064f384 | 124 | static void |
fba45db2 | 125 | mn10300_extract_return_value (struct type *type, char *regbuf, char *valbuf) |
0f71a2f6 JM |
126 | { |
127 | if (TYPE_CODE (type) == TYPE_CODE_PTR) | |
62700349 | 128 | memcpy (valbuf, regbuf + DEPRECATED_REGISTER_BYTE (4), TYPE_LENGTH (type)); |
0f71a2f6 | 129 | else |
62700349 | 130 | memcpy (valbuf, regbuf + DEPRECATED_REGISTER_BYTE (0), TYPE_LENGTH (type)); |
0f71a2f6 JM |
131 | } |
132 | ||
2ac51b36 | 133 | static CORE_ADDR |
fba45db2 | 134 | mn10300_extract_struct_value_address (char *regbuf) |
0f71a2f6 | 135 | { |
62700349 | 136 | return extract_unsigned_integer (regbuf + DEPRECATED_REGISTER_BYTE (4), |
12c266ea | 137 | DEPRECATED_REGISTER_RAW_SIZE (4)); |
0f71a2f6 JM |
138 | } |
139 | ||
2ac51b36 | 140 | static void |
fba45db2 | 141 | mn10300_store_return_value (struct type *type, char *valbuf) |
0f71a2f6 JM |
142 | { |
143 | if (TYPE_CODE (type) == TYPE_CODE_PTR) | |
62700349 | 144 | deprecated_write_register_bytes (DEPRECATED_REGISTER_BYTE (4), valbuf, |
73937e03 | 145 | TYPE_LENGTH (type)); |
0f71a2f6 | 146 | else |
62700349 | 147 | deprecated_write_register_bytes (DEPRECATED_REGISTER_BYTE (0), valbuf, |
73937e03 | 148 | TYPE_LENGTH (type)); |
0f71a2f6 JM |
149 | } |
150 | ||
a14ed312 | 151 | static struct frame_info *analyze_dummy_frame (CORE_ADDR, CORE_ADDR); |
c906108c | 152 | static struct frame_info * |
fba45db2 | 153 | analyze_dummy_frame (CORE_ADDR pc, CORE_ADDR frame) |
c906108c SS |
154 | { |
155 | static struct frame_info *dummy = NULL; | |
156 | if (dummy == NULL) | |
157 | { | |
a00a19e9 | 158 | struct frame_extra_info *extra_info; |
7b5849cc | 159 | CORE_ADDR *saved_regs; |
f6c609c4 | 160 | dummy = deprecated_frame_xmalloc (); |
7b5849cc | 161 | saved_regs = xmalloc (SIZEOF_FRAME_SAVED_REGS); |
7f8ab3a0 | 162 | deprecated_set_frame_saved_regs_hack (dummy, saved_regs); |
a00a19e9 AC |
163 | extra_info = XMALLOC (struct frame_extra_info); |
164 | deprecated_set_frame_extra_info_hack (dummy, extra_info); | |
c906108c | 165 | } |
483d36b2 AC |
166 | deprecated_set_frame_next_hack (dummy, NULL); |
167 | deprecated_set_frame_prev_hack (dummy, NULL); | |
50abf9e5 | 168 | deprecated_update_frame_pc_hack (dummy, pc); |
b0c6b05c | 169 | deprecated_update_frame_base_hack (dummy, frame); |
da50a4b7 AC |
170 | get_frame_extra_info (dummy)->status = 0; |
171 | get_frame_extra_info (dummy)->stack_size = 0; | |
1b1d3794 | 172 | memset (deprecated_get_frame_saved_regs (dummy), '\000', SIZEOF_FRAME_SAVED_REGS); |
f0d8db19 | 173 | mn10300_analyze_prologue (dummy, pc); |
c906108c SS |
174 | return dummy; |
175 | } | |
176 | ||
177 | /* Values for frame_info.status */ | |
178 | ||
179 | #define MY_FRAME_IN_SP 0x1 | |
180 | #define MY_FRAME_IN_FP 0x2 | |
181 | #define NO_MORE_FRAMES 0x4 | |
182 | ||
183 | ||
184 | /* Should call_function allocate stack space for a struct return? */ | |
2ac51b36 | 185 | static int |
fba45db2 | 186 | mn10300_use_struct_convention (int gcc_p, struct type *type) |
c906108c SS |
187 | { |
188 | return (TYPE_NFIELDS (type) > 1 || TYPE_LENGTH (type) > 8); | |
189 | } | |
190 | ||
191 | /* The breakpoint instruction must be the same size as the smallest | |
192 | instruction in the instruction set. | |
193 | ||
194 | The Matsushita mn10x00 processors have single byte instructions | |
195 | so we need a single byte breakpoint. Matsushita hasn't defined | |
196 | one, so we defined it ourselves. */ | |
197 | ||
f4f9705a | 198 | const static unsigned char * |
fba45db2 | 199 | mn10300_breakpoint_from_pc (CORE_ADDR *bp_addr, int *bp_size) |
c906108c | 200 | { |
c5aa993b JM |
201 | static char breakpoint[] = |
202 | {0xff}; | |
c906108c SS |
203 | *bp_size = 1; |
204 | return breakpoint; | |
205 | } | |
206 | ||
207 | ||
208 | /* Fix fi->frame if it's bogus at this point. This is a helper | |
209 | function for mn10300_analyze_prologue. */ | |
210 | ||
211 | static void | |
fba45db2 | 212 | fix_frame_pointer (struct frame_info *fi, int stack_size) |
c906108c | 213 | { |
11c02a10 | 214 | if (fi && get_next_frame (fi) == NULL) |
c906108c | 215 | { |
da50a4b7 | 216 | if (get_frame_extra_info (fi)->status & MY_FRAME_IN_SP) |
b0c6b05c | 217 | deprecated_update_frame_base_hack (fi, read_sp () - stack_size); |
da50a4b7 | 218 | else if (get_frame_extra_info (fi)->status & MY_FRAME_IN_FP) |
b0c6b05c | 219 | deprecated_update_frame_base_hack (fi, read_register (A3_REGNUM)); |
c906108c SS |
220 | } |
221 | } | |
222 | ||
223 | ||
224 | /* Set offsets of registers saved by movm instruction. | |
225 | This is a helper function for mn10300_analyze_prologue. */ | |
226 | ||
227 | static void | |
fba45db2 | 228 | set_movm_offsets (struct frame_info *fi, int movm_args) |
c906108c SS |
229 | { |
230 | int offset = 0; | |
231 | ||
232 | if (fi == NULL || movm_args == 0) | |
233 | return; | |
234 | ||
ae83b20d JB |
235 | if (movm_args & movm_other_bit) |
236 | { | |
237 | /* The `other' bit leaves a blank area of four bytes at the | |
238 | beginning of its block of saved registers, making it 32 bytes | |
239 | long in total. */ | |
1b1d3794 AC |
240 | deprecated_get_frame_saved_regs (fi)[LAR_REGNUM] = get_frame_base (fi) + offset + 4; |
241 | deprecated_get_frame_saved_regs (fi)[LIR_REGNUM] = get_frame_base (fi) + offset + 8; | |
242 | deprecated_get_frame_saved_regs (fi)[MDR_REGNUM] = get_frame_base (fi) + offset + 12; | |
243 | deprecated_get_frame_saved_regs (fi)[A0_REGNUM + 1] = get_frame_base (fi) + offset + 16; | |
244 | deprecated_get_frame_saved_regs (fi)[A0_REGNUM] = get_frame_base (fi) + offset + 20; | |
245 | deprecated_get_frame_saved_regs (fi)[D0_REGNUM + 1] = get_frame_base (fi) + offset + 24; | |
246 | deprecated_get_frame_saved_regs (fi)[D0_REGNUM] = get_frame_base (fi) + offset + 28; | |
ae83b20d JB |
247 | offset += 32; |
248 | } | |
249 | if (movm_args & movm_a3_bit) | |
c906108c | 250 | { |
1b1d3794 | 251 | deprecated_get_frame_saved_regs (fi)[A3_REGNUM] = get_frame_base (fi) + offset; |
c906108c SS |
252 | offset += 4; |
253 | } | |
ae83b20d | 254 | if (movm_args & movm_a2_bit) |
c906108c | 255 | { |
1b1d3794 | 256 | deprecated_get_frame_saved_regs (fi)[A2_REGNUM] = get_frame_base (fi) + offset; |
c906108c SS |
257 | offset += 4; |
258 | } | |
ae83b20d | 259 | if (movm_args & movm_d3_bit) |
c906108c | 260 | { |
1b1d3794 | 261 | deprecated_get_frame_saved_regs (fi)[D3_REGNUM] = get_frame_base (fi) + offset; |
c906108c SS |
262 | offset += 4; |
263 | } | |
ae83b20d | 264 | if (movm_args & movm_d2_bit) |
c906108c | 265 | { |
1b1d3794 | 266 | deprecated_get_frame_saved_regs (fi)[D2_REGNUM] = get_frame_base (fi) + offset; |
c906108c SS |
267 | offset += 4; |
268 | } | |
ae83b20d | 269 | if (AM33_MODE) |
c2d11a7d | 270 | { |
ae83b20d JB |
271 | if (movm_args & movm_exother_bit) |
272 | { | |
1b1d3794 AC |
273 | deprecated_get_frame_saved_regs (fi)[MCVF_REGNUM] = get_frame_base (fi) + offset; |
274 | deprecated_get_frame_saved_regs (fi)[MCRL_REGNUM] = get_frame_base (fi) + offset + 4; | |
275 | deprecated_get_frame_saved_regs (fi)[MCRH_REGNUM] = get_frame_base (fi) + offset + 8; | |
276 | deprecated_get_frame_saved_regs (fi)[MDRQ_REGNUM] = get_frame_base (fi) + offset + 12; | |
277 | deprecated_get_frame_saved_regs (fi)[E0_REGNUM + 1] = get_frame_base (fi) + offset + 16; | |
278 | deprecated_get_frame_saved_regs (fi)[E0_REGNUM + 0] = get_frame_base (fi) + offset + 20; | |
ae83b20d JB |
279 | offset += 24; |
280 | } | |
281 | if (movm_args & movm_exreg1_bit) | |
282 | { | |
1b1d3794 AC |
283 | deprecated_get_frame_saved_regs (fi)[E0_REGNUM + 7] = get_frame_base (fi) + offset; |
284 | deprecated_get_frame_saved_regs (fi)[E0_REGNUM + 6] = get_frame_base (fi) + offset + 4; | |
285 | deprecated_get_frame_saved_regs (fi)[E0_REGNUM + 5] = get_frame_base (fi) + offset + 8; | |
286 | deprecated_get_frame_saved_regs (fi)[E0_REGNUM + 4] = get_frame_base (fi) + offset + 12; | |
ae83b20d JB |
287 | offset += 16; |
288 | } | |
289 | if (movm_args & movm_exreg0_bit) | |
290 | { | |
1b1d3794 AC |
291 | deprecated_get_frame_saved_regs (fi)[E0_REGNUM + 3] = get_frame_base (fi) + offset; |
292 | deprecated_get_frame_saved_regs (fi)[E0_REGNUM + 2] = get_frame_base (fi) + offset + 4; | |
ae83b20d JB |
293 | offset += 8; |
294 | } | |
c2d11a7d | 295 | } |
c906108c SS |
296 | } |
297 | ||
298 | ||
299 | /* The main purpose of this file is dealing with prologues to extract | |
300 | information about stack frames and saved registers. | |
301 | ||
4eab1e18 JB |
302 | In gcc/config/mn13000/mn10300.c, the expand_prologue prologue |
303 | function is pretty readable, and has a nice explanation of how the | |
304 | prologue is generated. The prologues generated by that code will | |
03a0cf8a JB |
305 | have the following form (NOTE: the current code doesn't handle all |
306 | this!): | |
c906108c | 307 | |
4eab1e18 JB |
308 | + If this is an old-style varargs function, then its arguments |
309 | need to be flushed back to the stack: | |
310 | ||
311 | mov d0,(4,sp) | |
312 | mov d1,(4,sp) | |
c906108c | 313 | |
4eab1e18 JB |
314 | + If we use any of the callee-saved registers, save them now. |
315 | ||
316 | movm [some callee-saved registers],(sp) | |
317 | ||
318 | + If we have any floating-point registers to save: | |
319 | ||
320 | - Decrement the stack pointer to reserve space for the registers. | |
321 | If the function doesn't need a frame pointer, we may combine | |
322 | this with the adjustment that reserves space for the frame. | |
323 | ||
324 | add -SIZE, sp | |
325 | ||
326 | - Save the floating-point registers. We have two possible | |
327 | strategies: | |
328 | ||
329 | . Save them at fixed offset from the SP: | |
330 | ||
331 | fmov fsN,(OFFSETN,sp) | |
332 | fmov fsM,(OFFSETM,sp) | |
333 | ... | |
334 | ||
03a0cf8a JB |
335 | Note that, if OFFSETN happens to be zero, you'll get the |
336 | different opcode: fmov fsN,(sp) | |
337 | ||
4eab1e18 JB |
338 | . Or, set a0 to the start of the save area, and then use |
339 | post-increment addressing to save the FP registers. | |
340 | ||
341 | mov sp, a0 | |
342 | add SIZE, a0 | |
343 | fmov fsN,(a0+) | |
344 | fmov fsM,(a0+) | |
345 | ... | |
346 | ||
347 | + If the function needs a frame pointer, we set it here. | |
348 | ||
349 | mov sp, a3 | |
350 | ||
351 | + Now we reserve space for the stack frame proper. This could be | |
352 | merged into the `add -SIZE, sp' instruction for FP saves up | |
353 | above, unless we needed to set the frame pointer in the previous | |
354 | step, or the frame is so large that allocating the whole thing at | |
355 | once would put the FP register save slots out of reach of the | |
356 | addressing mode (128 bytes). | |
357 | ||
358 | add -SIZE, sp | |
c906108c SS |
359 | |
360 | One day we might keep the stack pointer constant, that won't | |
361 | change the code for prologues, but it will make the frame | |
362 | pointerless case much more common. */ | |
c5aa993b | 363 | |
c906108c SS |
364 | /* Analyze the prologue to determine where registers are saved, |
365 | the end of the prologue, etc etc. Return the end of the prologue | |
366 | scanned. | |
367 | ||
368 | We store into FI (if non-null) several tidbits of information: | |
369 | ||
c5aa993b JM |
370 | * stack_size -- size of this stack frame. Note that if we stop in |
371 | certain parts of the prologue/epilogue we may claim the size of the | |
372 | current frame is zero. This happens when the current frame has | |
373 | not been allocated yet or has already been deallocated. | |
c906108c | 374 | |
c5aa993b | 375 | * fsr -- Addresses of registers saved in the stack by this frame. |
c906108c | 376 | |
c5aa993b JM |
377 | * status -- A (relatively) generic status indicator. It's a bitmask |
378 | with the following bits: | |
c906108c | 379 | |
c5aa993b JM |
380 | MY_FRAME_IN_SP: The base of the current frame is actually in |
381 | the stack pointer. This can happen for frame pointerless | |
382 | functions, or cases where we're stopped in the prologue/epilogue | |
383 | itself. For these cases mn10300_analyze_prologue will need up | |
384 | update fi->frame before returning or analyzing the register | |
385 | save instructions. | |
c906108c | 386 | |
c5aa993b | 387 | MY_FRAME_IN_FP: The base of the current frame is in the |
4eab1e18 | 388 | frame pointer register ($a3). |
c906108c | 389 | |
c5aa993b JM |
390 | NO_MORE_FRAMES: Set this if the current frame is "start" or |
391 | if the first instruction looks like mov <imm>,sp. This tells | |
392 | frame chain to not bother trying to unwind past this frame. */ | |
c906108c SS |
393 | |
394 | static CORE_ADDR | |
fba45db2 | 395 | mn10300_analyze_prologue (struct frame_info *fi, CORE_ADDR pc) |
c906108c SS |
396 | { |
397 | CORE_ADDR func_addr, func_end, addr, stop; | |
398 | CORE_ADDR stack_size; | |
399 | int imm_size; | |
400 | unsigned char buf[4]; | |
401 | int status, movm_args = 0; | |
402 | char *name; | |
403 | ||
404 | /* Use the PC in the frame if it's provided to look up the | |
f0d8db19 KB |
405 | start of this function. |
406 | ||
407 | Note: kevinb/2003-07-16: We used to do the following here: | |
408 | pc = (fi ? get_frame_pc (fi) : pc); | |
409 | But this is (now) badly broken when called from analyze_dummy_frame(). | |
410 | */ | |
411 | pc = (pc ? pc : get_frame_pc (fi)); | |
c906108c SS |
412 | |
413 | /* Find the start of this function. */ | |
414 | status = find_pc_partial_function (pc, &name, &func_addr, &func_end); | |
415 | ||
416 | /* Do nothing if we couldn't find the start of this function or if we're | |
417 | stopped at the first instruction in the prologue. */ | |
418 | if (status == 0) | |
43ff13b4 JM |
419 | { |
420 | return pc; | |
421 | } | |
c906108c SS |
422 | |
423 | /* If we're in start, then give up. */ | |
424 | if (strcmp (name, "start") == 0) | |
425 | { | |
426 | if (fi != NULL) | |
da50a4b7 | 427 | get_frame_extra_info (fi)->status = NO_MORE_FRAMES; |
c906108c SS |
428 | return pc; |
429 | } | |
430 | ||
431 | /* At the start of a function our frame is in the stack pointer. */ | |
432 | if (fi) | |
da50a4b7 | 433 | get_frame_extra_info (fi)->status = MY_FRAME_IN_SP; |
c906108c SS |
434 | |
435 | /* Get the next two bytes into buf, we need two because rets is a two | |
436 | byte insn and the first isn't enough to uniquely identify it. */ | |
437 | status = read_memory_nobpt (pc, buf, 2); | |
438 | if (status != 0) | |
439 | return pc; | |
440 | ||
f0d8db19 KB |
441 | #if 0 |
442 | /* Note: kevinb/2003-07-16: We shouldn't be making these sorts of | |
443 | changes to the frame in prologue examination code. */ | |
c906108c SS |
444 | /* If we're physically on an "rets" instruction, then our frame has |
445 | already been deallocated. Note this can also be true for retf | |
446 | and ret if they specify a size of zero. | |
447 | ||
448 | In this case fi->frame is bogus, we need to fix it. */ | |
449 | if (fi && buf[0] == 0xf0 && buf[1] == 0xfc) | |
450 | { | |
11c02a10 | 451 | if (get_next_frame (fi) == NULL) |
b0c6b05c | 452 | deprecated_update_frame_base_hack (fi, read_sp ()); |
50abf9e5 | 453 | return get_frame_pc (fi); |
c906108c SS |
454 | } |
455 | ||
456 | /* Similarly if we're stopped on the first insn of a prologue as our | |
457 | frame hasn't been allocated yet. */ | |
50abf9e5 | 458 | if (fi && get_frame_pc (fi) == func_addr) |
c906108c | 459 | { |
11c02a10 | 460 | if (get_next_frame (fi) == NULL) |
b0c6b05c | 461 | deprecated_update_frame_base_hack (fi, read_sp ()); |
50abf9e5 | 462 | return get_frame_pc (fi); |
c906108c | 463 | } |
f0d8db19 | 464 | #endif |
c906108c SS |
465 | |
466 | /* Figure out where to stop scanning. */ | |
f0d8db19 | 467 | stop = fi ? pc : func_end; |
c906108c SS |
468 | |
469 | /* Don't walk off the end of the function. */ | |
470 | stop = stop > func_end ? func_end : stop; | |
471 | ||
472 | /* Start scanning on the first instruction of this function. */ | |
473 | addr = func_addr; | |
474 | ||
475 | /* Suck in two bytes. */ | |
476 | status = read_memory_nobpt (addr, buf, 2); | |
477 | if (status != 0) | |
478 | { | |
479 | fix_frame_pointer (fi, 0); | |
480 | return addr; | |
481 | } | |
482 | ||
4eab1e18 JB |
483 | /* First see if this insn sets the stack pointer from a register; if |
484 | so, it's probably the initialization of the stack pointer in _start, | |
485 | so mark this as the bottom-most frame. */ | |
c906108c SS |
486 | if (buf[0] == 0xf2 && (buf[1] & 0xf3) == 0xf0) |
487 | { | |
488 | if (fi) | |
da50a4b7 | 489 | get_frame_extra_info (fi)->status = NO_MORE_FRAMES; |
c906108c SS |
490 | return addr; |
491 | } | |
492 | ||
493 | /* Now look for movm [regs],sp, which saves the callee saved registers. | |
494 | ||
495 | At this time we don't know if fi->frame is valid, so we only note | |
496 | that we encountered a movm instruction. Later, we'll set the entries | |
497 | in fsr.regs as needed. */ | |
498 | if (buf[0] == 0xcf) | |
499 | { | |
500 | /* Extract the register list for the movm instruction. */ | |
501 | status = read_memory_nobpt (addr + 1, buf, 1); | |
502 | movm_args = *buf; | |
503 | ||
504 | addr += 2; | |
505 | ||
506 | /* Quit now if we're beyond the stop point. */ | |
507 | if (addr >= stop) | |
508 | { | |
509 | /* Fix fi->frame since it's bogus at this point. */ | |
11c02a10 | 510 | if (fi && get_next_frame (fi) == NULL) |
b0c6b05c | 511 | deprecated_update_frame_base_hack (fi, read_sp ()); |
c906108c SS |
512 | |
513 | /* Note if/where callee saved registers were saved. */ | |
514 | set_movm_offsets (fi, movm_args); | |
515 | return addr; | |
516 | } | |
517 | ||
518 | /* Get the next two bytes so the prologue scan can continue. */ | |
519 | status = read_memory_nobpt (addr, buf, 2); | |
520 | if (status != 0) | |
521 | { | |
522 | /* Fix fi->frame since it's bogus at this point. */ | |
11c02a10 | 523 | if (fi && get_next_frame (fi) == NULL) |
b0c6b05c | 524 | deprecated_update_frame_base_hack (fi, read_sp ()); |
c906108c SS |
525 | |
526 | /* Note if/where callee saved registers were saved. */ | |
527 | set_movm_offsets (fi, movm_args); | |
528 | return addr; | |
529 | } | |
530 | } | |
531 | ||
532 | /* Now see if we set up a frame pointer via "mov sp,a3" */ | |
533 | if (buf[0] == 0x3f) | |
534 | { | |
535 | addr += 1; | |
536 | ||
537 | /* The frame pointer is now valid. */ | |
538 | if (fi) | |
539 | { | |
da50a4b7 AC |
540 | get_frame_extra_info (fi)->status |= MY_FRAME_IN_FP; |
541 | get_frame_extra_info (fi)->status &= ~MY_FRAME_IN_SP; | |
c906108c SS |
542 | } |
543 | ||
544 | /* Quit now if we're beyond the stop point. */ | |
545 | if (addr >= stop) | |
546 | { | |
547 | /* Fix fi->frame if it's bogus at this point. */ | |
548 | fix_frame_pointer (fi, 0); | |
549 | ||
550 | /* Note if/where callee saved registers were saved. */ | |
551 | set_movm_offsets (fi, movm_args); | |
552 | return addr; | |
553 | } | |
554 | ||
555 | /* Get two more bytes so scanning can continue. */ | |
556 | status = read_memory_nobpt (addr, buf, 2); | |
557 | if (status != 0) | |
558 | { | |
559 | /* Fix fi->frame if it's bogus at this point. */ | |
560 | fix_frame_pointer (fi, 0); | |
561 | ||
562 | /* Note if/where callee saved registers were saved. */ | |
563 | set_movm_offsets (fi, movm_args); | |
564 | return addr; | |
565 | } | |
566 | } | |
c5aa993b | 567 | |
c906108c SS |
568 | /* Next we should allocate the local frame. No more prologue insns |
569 | are found after allocating the local frame. | |
c5aa993b | 570 | |
c906108c | 571 | Search for add imm8,sp (0xf8feXX) |
c5aa993b JM |
572 | or add imm16,sp (0xfafeXXXX) |
573 | or add imm32,sp (0xfcfeXXXXXXXX). | |
574 | ||
c906108c SS |
575 | If none of the above was found, then this prologue has no |
576 | additional stack. */ | |
577 | ||
578 | status = read_memory_nobpt (addr, buf, 2); | |
579 | if (status != 0) | |
580 | { | |
581 | /* Fix fi->frame if it's bogus at this point. */ | |
582 | fix_frame_pointer (fi, 0); | |
583 | ||
584 | /* Note if/where callee saved registers were saved. */ | |
585 | set_movm_offsets (fi, movm_args); | |
586 | return addr; | |
587 | } | |
588 | ||
589 | imm_size = 0; | |
590 | if (buf[0] == 0xf8 && buf[1] == 0xfe) | |
591 | imm_size = 1; | |
592 | else if (buf[0] == 0xfa && buf[1] == 0xfe) | |
593 | imm_size = 2; | |
594 | else if (buf[0] == 0xfc && buf[1] == 0xfe) | |
595 | imm_size = 4; | |
596 | ||
597 | if (imm_size != 0) | |
598 | { | |
599 | /* Suck in imm_size more bytes, they'll hold the size of the | |
600 | current frame. */ | |
601 | status = read_memory_nobpt (addr + 2, buf, imm_size); | |
602 | if (status != 0) | |
603 | { | |
604 | /* Fix fi->frame if it's bogus at this point. */ | |
605 | fix_frame_pointer (fi, 0); | |
606 | ||
607 | /* Note if/where callee saved registers were saved. */ | |
608 | set_movm_offsets (fi, movm_args); | |
609 | return addr; | |
610 | } | |
611 | ||
612 | /* Note the size of the stack in the frame info structure. */ | |
613 | stack_size = extract_signed_integer (buf, imm_size); | |
614 | if (fi) | |
da50a4b7 | 615 | get_frame_extra_info (fi)->stack_size = stack_size; |
c906108c SS |
616 | |
617 | /* We just consumed 2 + imm_size bytes. */ | |
618 | addr += 2 + imm_size; | |
619 | ||
620 | /* No more prologue insns follow, so begin preparation to return. */ | |
621 | /* Fix fi->frame if it's bogus at this point. */ | |
622 | fix_frame_pointer (fi, stack_size); | |
623 | ||
624 | /* Note if/where callee saved registers were saved. */ | |
625 | set_movm_offsets (fi, movm_args); | |
626 | return addr; | |
627 | } | |
628 | ||
629 | /* We never found an insn which allocates local stack space, regardless | |
630 | this is the end of the prologue. */ | |
631 | /* Fix fi->frame if it's bogus at this point. */ | |
632 | fix_frame_pointer (fi, 0); | |
633 | ||
634 | /* Note if/where callee saved registers were saved. */ | |
635 | set_movm_offsets (fi, movm_args); | |
636 | return addr; | |
637 | } | |
c5aa993b | 638 | |
ae83b20d JB |
639 | |
640 | /* Function: saved_regs_size | |
641 | Return the size in bytes of the register save area, based on the | |
642 | saved_regs array in FI. */ | |
643 | static int | |
644 | saved_regs_size (struct frame_info *fi) | |
645 | { | |
646 | int adjust = 0; | |
647 | int i; | |
648 | ||
649 | /* Reserve four bytes for every register saved. */ | |
650 | for (i = 0; i < NUM_REGS; i++) | |
1b1d3794 | 651 | if (deprecated_get_frame_saved_regs (fi)[i]) |
ae83b20d JB |
652 | adjust += 4; |
653 | ||
654 | /* If we saved LIR, then it's most likely we used a `movm' | |
655 | instruction with the `other' bit set, in which case the SP is | |
656 | decremented by an extra four bytes, "to simplify calculation | |
657 | of the transfer area", according to the processor manual. */ | |
1b1d3794 | 658 | if (deprecated_get_frame_saved_regs (fi)[LIR_REGNUM]) |
ae83b20d JB |
659 | adjust += 4; |
660 | ||
661 | return adjust; | |
662 | } | |
663 | ||
664 | ||
c906108c SS |
665 | /* Function: frame_chain |
666 | Figure out and return the caller's frame pointer given current | |
667 | frame_info struct. | |
668 | ||
669 | We don't handle dummy frames yet but we would probably just return the | |
670 | stack pointer that was in use at the time the function call was made? */ | |
671 | ||
2ac51b36 | 672 | static CORE_ADDR |
fba45db2 | 673 | mn10300_frame_chain (struct frame_info *fi) |
c906108c SS |
674 | { |
675 | struct frame_info *dummy; | |
676 | /* Walk through the prologue to determine the stack size, | |
677 | location of saved registers, end of the prologue, etc. */ | |
da50a4b7 | 678 | if (get_frame_extra_info (fi)->status == 0) |
c5aa993b | 679 | mn10300_analyze_prologue (fi, (CORE_ADDR) 0); |
c906108c SS |
680 | |
681 | /* Quit now if mn10300_analyze_prologue set NO_MORE_FRAMES. */ | |
da50a4b7 | 682 | if (get_frame_extra_info (fi)->status & NO_MORE_FRAMES) |
c906108c SS |
683 | return 0; |
684 | ||
685 | /* Now that we've analyzed our prologue, determine the frame | |
686 | pointer for our caller. | |
687 | ||
c5aa993b JM |
688 | If our caller has a frame pointer, then we need to |
689 | find the entry value of $a3 to our function. | |
690 | ||
691 | If fsr.regs[A3_REGNUM] is nonzero, then it's at the memory | |
692 | location pointed to by fsr.regs[A3_REGNUM]. | |
c906108c | 693 | |
c5aa993b | 694 | Else it's still in $a3. |
c906108c | 695 | |
c5aa993b JM |
696 | If our caller does not have a frame pointer, then his |
697 | frame base is fi->frame + -caller's stack size. */ | |
c906108c | 698 | |
c906108c SS |
699 | /* The easiest way to get that info is to analyze our caller's frame. |
700 | So we set up a dummy frame and call mn10300_analyze_prologue to | |
701 | find stuff for us. */ | |
8bedc050 | 702 | dummy = analyze_dummy_frame (DEPRECATED_FRAME_SAVED_PC (fi), get_frame_base (fi)); |
c906108c | 703 | |
da50a4b7 | 704 | if (get_frame_extra_info (dummy)->status & MY_FRAME_IN_FP) |
c906108c SS |
705 | { |
706 | /* Our caller has a frame pointer. So find the frame in $a3 or | |
707 | in the stack. */ | |
1b1d3794 AC |
708 | if (deprecated_get_frame_saved_regs (fi)[A3_REGNUM]) |
709 | return (read_memory_integer (deprecated_get_frame_saved_regs (fi)[A3_REGNUM], | |
b1e29e33 | 710 | DEPRECATED_REGISTER_SIZE)); |
c906108c SS |
711 | else |
712 | return read_register (A3_REGNUM); | |
713 | } | |
714 | else | |
715 | { | |
ae83b20d | 716 | int adjust = saved_regs_size (fi); |
c906108c SS |
717 | |
718 | /* Our caller does not have a frame pointer. So his frame starts | |
c5aa993b JM |
719 | at the base of our frame (fi->frame) + register save space |
720 | + <his size>. */ | |
da50a4b7 | 721 | return get_frame_base (fi) + adjust + -get_frame_extra_info (dummy)->stack_size; |
c906108c SS |
722 | } |
723 | } | |
724 | ||
725 | /* Function: skip_prologue | |
726 | Return the address of the first inst past the prologue of the function. */ | |
727 | ||
2ac51b36 | 728 | static CORE_ADDR |
fba45db2 | 729 | mn10300_skip_prologue (CORE_ADDR pc) |
c906108c SS |
730 | { |
731 | /* We used to check the debug symbols, but that can lose if | |
732 | we have a null prologue. */ | |
733 | return mn10300_analyze_prologue (NULL, pc); | |
734 | } | |
735 | ||
ee9f9641 JB |
736 | /* generic_pop_current_frame calls this function if the current |
737 | frame isn't a dummy frame. */ | |
738 | static void | |
739 | mn10300_pop_frame_regular (struct frame_info *frame) | |
c906108c SS |
740 | { |
741 | int regnum; | |
742 | ||
8bedc050 | 743 | write_register (PC_REGNUM, DEPRECATED_FRAME_SAVED_PC (frame)); |
c906108c | 744 | |
ee9f9641 JB |
745 | /* Restore any saved registers. */ |
746 | for (regnum = 0; regnum < NUM_REGS; regnum++) | |
1b1d3794 | 747 | if (deprecated_get_frame_saved_regs (frame)[regnum] != 0) |
ee9f9641 JB |
748 | { |
749 | ULONGEST value; | |
c906108c | 750 | |
1b1d3794 | 751 | value = read_memory_unsigned_integer (deprecated_get_frame_saved_regs (frame)[regnum], |
12c266ea | 752 | DEPRECATED_REGISTER_RAW_SIZE (regnum)); |
ee9f9641 JB |
753 | write_register (regnum, value); |
754 | } | |
c906108c | 755 | |
ee9f9641 | 756 | /* Actually cut back the stack. */ |
c193f6ac | 757 | write_register (SP_REGNUM, get_frame_base (frame)); |
c906108c | 758 | |
ee9f9641 JB |
759 | /* Don't we need to set the PC?!? XXX FIXME. */ |
760 | } | |
761 | ||
762 | /* Function: pop_frame | |
763 | This routine gets called when either the user uses the `return' | |
764 | command, or the call dummy breakpoint gets hit. */ | |
765 | static void | |
766 | mn10300_pop_frame (void) | |
767 | { | |
768 | /* This function checks for and handles generic dummy frames, and | |
769 | calls back to our function for ordinary frames. */ | |
770 | generic_pop_current_frame (mn10300_pop_frame_regular); | |
c906108c SS |
771 | |
772 | /* Throw away any cached frame information. */ | |
773 | flush_cached_frames (); | |
774 | } | |
775 | ||
776 | /* Function: push_arguments | |
777 | Setup arguments for a call to the target. Arguments go in | |
778 | order on the stack. */ | |
779 | ||
2ac51b36 | 780 | static CORE_ADDR |
91225883 AC |
781 | mn10300_push_arguments (int nargs, struct value **args, CORE_ADDR sp, |
782 | int struct_return, CORE_ADDR struct_addr) | |
c906108c SS |
783 | { |
784 | int argnum = 0; | |
785 | int len = 0; | |
786 | int stack_offset = 0; | |
787 | int regsused = struct_return ? 1 : 0; | |
788 | ||
789 | /* This should be a nop, but align the stack just in case something | |
790 | went wrong. Stacks are four byte aligned on the mn10300. */ | |
791 | sp &= ~3; | |
792 | ||
793 | /* Now make space on the stack for the args. | |
794 | ||
795 | XXX This doesn't appear to handle pass-by-invisible reference | |
796 | arguments. */ | |
797 | for (argnum = 0; argnum < nargs; argnum++) | |
798 | { | |
799 | int arg_length = (TYPE_LENGTH (VALUE_TYPE (args[argnum])) + 3) & ~3; | |
800 | ||
801 | while (regsused < 2 && arg_length > 0) | |
802 | { | |
803 | regsused++; | |
804 | arg_length -= 4; | |
805 | } | |
806 | len += arg_length; | |
807 | } | |
808 | ||
809 | /* Allocate stack space. */ | |
810 | sp -= len; | |
811 | ||
812 | regsused = struct_return ? 1 : 0; | |
813 | /* Push all arguments onto the stack. */ | |
814 | for (argnum = 0; argnum < nargs; argnum++) | |
815 | { | |
816 | int len; | |
817 | char *val; | |
818 | ||
819 | /* XXX Check this. What about UNIONS? */ | |
820 | if (TYPE_CODE (VALUE_TYPE (*args)) == TYPE_CODE_STRUCT | |
821 | && TYPE_LENGTH (VALUE_TYPE (*args)) > 8) | |
822 | { | |
823 | /* XXX Wrong, we want a pointer to this argument. */ | |
c5aa993b JM |
824 | len = TYPE_LENGTH (VALUE_TYPE (*args)); |
825 | val = (char *) VALUE_CONTENTS (*args); | |
c906108c SS |
826 | } |
827 | else | |
828 | { | |
829 | len = TYPE_LENGTH (VALUE_TYPE (*args)); | |
c5aa993b | 830 | val = (char *) VALUE_CONTENTS (*args); |
c906108c SS |
831 | } |
832 | ||
833 | while (regsused < 2 && len > 0) | |
834 | { | |
835 | write_register (regsused, extract_unsigned_integer (val, 4)); | |
836 | val += 4; | |
837 | len -= 4; | |
838 | regsused++; | |
839 | } | |
840 | ||
841 | while (len > 0) | |
842 | { | |
843 | write_memory (sp + stack_offset, val, 4); | |
844 | len -= 4; | |
845 | val += 4; | |
846 | stack_offset += 4; | |
847 | } | |
848 | ||
849 | args++; | |
850 | } | |
851 | ||
852 | /* Make space for the flushback area. */ | |
853 | sp -= 8; | |
854 | return sp; | |
855 | } | |
856 | ||
857 | /* Function: push_return_address (pc) | |
858 | Set up the return address for the inferior function call. | |
859 | Needed for targets where we don't actually execute a JSR/BSR instruction */ | |
c5aa993b | 860 | |
2ac51b36 | 861 | static CORE_ADDR |
fba45db2 | 862 | mn10300_push_return_address (CORE_ADDR pc, CORE_ADDR sp) |
c906108c SS |
863 | { |
864 | unsigned char buf[4]; | |
865 | ||
88a82a65 | 866 | store_unsigned_integer (buf, 4, entry_point_address ()); |
c906108c SS |
867 | write_memory (sp - 4, buf, 4); |
868 | return sp - 4; | |
869 | } | |
870 | ||
871 | /* Function: store_struct_return (addr,sp) | |
872 | Store the structure value return address for an inferior function | |
873 | call. */ | |
c5aa993b | 874 | |
2ac51b36 | 875 | static void |
fba45db2 | 876 | mn10300_store_struct_return (CORE_ADDR addr, CORE_ADDR sp) |
c906108c SS |
877 | { |
878 | /* The structure return address is passed as the first argument. */ | |
879 | write_register (0, addr); | |
c906108c | 880 | } |
c5aa993b | 881 | |
c906108c SS |
882 | /* Function: frame_saved_pc |
883 | Find the caller of this frame. We do this by seeing if RP_REGNUM | |
884 | is saved in the stack anywhere, otherwise we get it from the | |
885 | registers. If the inner frame is a dummy frame, return its PC | |
886 | instead of RP, because that's where "caller" of the dummy-frame | |
887 | will be found. */ | |
888 | ||
2ac51b36 | 889 | static CORE_ADDR |
fba45db2 | 890 | mn10300_frame_saved_pc (struct frame_info *fi) |
c906108c | 891 | { |
ae83b20d | 892 | int adjust = saved_regs_size (fi); |
c906108c | 893 | |
b1e29e33 AC |
894 | return (read_memory_integer (get_frame_base (fi) + adjust, |
895 | DEPRECATED_REGISTER_SIZE)); | |
c906108c SS |
896 | } |
897 | ||
c906108c SS |
898 | /* Function: mn10300_init_extra_frame_info |
899 | Setup the frame's frame pointer, pc, and frame addresses for saved | |
900 | registers. Most of the work is done in mn10300_analyze_prologue(). | |
901 | ||
902 | Note that when we are called for the last frame (currently active frame), | |
50abf9e5 | 903 | that get_frame_pc (fi) and fi->frame will already be setup. However, fi->frame will |
c906108c SS |
904 | be valid only if this routine uses FP. For previous frames, fi-frame will |
905 | always be correct. mn10300_analyze_prologue will fix fi->frame if | |
906 | it's not valid. | |
907 | ||
04714b91 AC |
908 | We can be called with the PC in the call dummy under two |
909 | circumstances. First, during normal backtracing, second, while | |
910 | figuring out the frame pointer just prior to calling the target | |
911 | function (see call_function_by_hand). */ | |
c906108c | 912 | |
2ac51b36 | 913 | static void |
ad8fe2ce | 914 | mn10300_init_extra_frame_info (int fromleaf, struct frame_info *fi) |
c906108c | 915 | { |
11c02a10 | 916 | if (get_next_frame (fi)) |
8bedc050 | 917 | deprecated_update_frame_pc_hack (fi, DEPRECATED_FRAME_SAVED_PC (get_next_frame (fi))); |
c906108c SS |
918 | |
919 | frame_saved_regs_zalloc (fi); | |
a00a19e9 | 920 | frame_extra_info_zalloc (fi, sizeof (struct frame_extra_info)); |
c906108c | 921 | |
da50a4b7 AC |
922 | get_frame_extra_info (fi)->status = 0; |
923 | get_frame_extra_info (fi)->stack_size = 0; | |
c906108c SS |
924 | |
925 | mn10300_analyze_prologue (fi, 0); | |
926 | } | |
927 | ||
ad8fe2ce JB |
928 | |
929 | /* This function's job is handled by init_extra_frame_info. */ | |
2ac51b36 | 930 | static void |
ad8fe2ce JB |
931 | mn10300_frame_init_saved_regs (struct frame_info *frame) |
932 | { | |
933 | } | |
934 | ||
935 | ||
c906108c SS |
936 | /* Function: mn10300_virtual_frame_pointer |
937 | Return the register that the function uses for a frame pointer, | |
938 | plus any necessary offset to be applied to the register before | |
939 | any frame pointer offsets. */ | |
940 | ||
39d4ef09 AC |
941 | static void |
942 | mn10300_virtual_frame_pointer (CORE_ADDR pc, | |
943 | int *reg, | |
944 | LONGEST *offset) | |
c906108c SS |
945 | { |
946 | struct frame_info *dummy = analyze_dummy_frame (pc, 0); | |
947 | /* Set up a dummy frame_info, Analyze the prolog and fill in the | |
948 | extra info. */ | |
949 | /* Results will tell us which type of frame it uses. */ | |
da50a4b7 | 950 | if (get_frame_extra_info (dummy)->status & MY_FRAME_IN_SP) |
c906108c | 951 | { |
c5aa993b | 952 | *reg = SP_REGNUM; |
da50a4b7 | 953 | *offset = -(get_frame_extra_info (dummy)->stack_size); |
c906108c SS |
954 | } |
955 | else | |
956 | { | |
c5aa993b | 957 | *reg = A3_REGNUM; |
c906108c SS |
958 | *offset = 0; |
959 | } | |
960 | } | |
c5aa993b | 961 | |
91225883 AC |
962 | static int |
963 | mn10300_reg_struct_has_addr (int gcc_p, struct type *type) | |
c906108c | 964 | { |
91225883 AC |
965 | return (TYPE_LENGTH (type) > 8); |
966 | } | |
c906108c | 967 | |
f6df245f AC |
968 | static struct type * |
969 | mn10300_register_virtual_type (int reg) | |
970 | { | |
971 | return builtin_type_int; | |
972 | } | |
973 | ||
974 | static int | |
975 | mn10300_register_byte (int reg) | |
976 | { | |
977 | return (reg * 4); | |
978 | } | |
979 | ||
980 | static int | |
981 | mn10300_register_virtual_size (int reg) | |
982 | { | |
983 | return 4; | |
984 | } | |
985 | ||
986 | static int | |
987 | mn10300_register_raw_size (int reg) | |
988 | { | |
989 | return 4; | |
990 | } | |
991 | ||
23436510 JB |
992 | /* If DWARF2 is a register number appearing in Dwarf2 debug info, then |
993 | mn10300_dwarf2_reg_to_regnum (DWARF2) is the corresponding GDB | |
994 | register number. Why don't Dwarf2 and GDB use the same numbering? | |
995 | Who knows? But since people have object files lying around with | |
996 | the existing Dwarf2 numbering, and other people have written stubs | |
997 | to work with the existing GDB, neither of them can change. So we | |
998 | just have to cope. */ | |
999 | static int | |
1000 | mn10300_dwarf2_reg_to_regnum (int dwarf2) | |
1001 | { | |
1002 | /* This table is supposed to be shaped like the REGISTER_NAMES | |
1003 | initializer in gcc/config/mn10300/mn10300.h. Registers which | |
1004 | appear in GCC's numbering, but have no counterpart in GDB's | |
1005 | world, are marked with a -1. */ | |
1006 | static int dwarf2_to_gdb[] = { | |
1007 | 0, 1, 2, 3, 4, 5, 6, 7, -1, 8, | |
1008 | 15, 16, 17, 18, 19, 20, 21, 22 | |
1009 | }; | |
1010 | int gdb; | |
1011 | ||
1012 | if (dwarf2 < 0 | |
1013 | || dwarf2 >= (sizeof (dwarf2_to_gdb) / sizeof (dwarf2_to_gdb[0])) | |
1014 | || dwarf2_to_gdb[dwarf2] == -1) | |
1015 | internal_error (__FILE__, __LINE__, | |
1016 | "bogus register number in debug info: %d", dwarf2); | |
1017 | ||
1018 | return dwarf2_to_gdb[dwarf2]; | |
1019 | } | |
1020 | ||
f6df245f AC |
1021 | static void |
1022 | mn10300_print_register (const char *name, int regnum, int reg_width) | |
1023 | { | |
d9d9c31f | 1024 | char raw_buffer[MAX_REGISTER_SIZE]; |
f6df245f AC |
1025 | |
1026 | if (reg_width) | |
1027 | printf_filtered ("%*s: ", reg_width, name); | |
1028 | else | |
1029 | printf_filtered ("%s: ", name); | |
1030 | ||
1031 | /* Get the data */ | |
6e7f8b9c | 1032 | if (!frame_register_read (deprecated_selected_frame, regnum, raw_buffer)) |
f6df245f AC |
1033 | { |
1034 | printf_filtered ("[invalid]"); | |
1035 | return; | |
1036 | } | |
1037 | else | |
1038 | { | |
1039 | int byte; | |
d7449b42 | 1040 | if (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG) |
f6df245f | 1041 | { |
12c266ea AC |
1042 | for (byte = DEPRECATED_REGISTER_RAW_SIZE (regnum) - DEPRECATED_REGISTER_VIRTUAL_SIZE (regnum); |
1043 | byte < DEPRECATED_REGISTER_RAW_SIZE (regnum); | |
f6df245f AC |
1044 | byte++) |
1045 | printf_filtered ("%02x", (unsigned char) raw_buffer[byte]); | |
1046 | } | |
1047 | else | |
1048 | { | |
f30992d4 | 1049 | for (byte = DEPRECATED_REGISTER_VIRTUAL_SIZE (regnum) - 1; |
f6df245f AC |
1050 | byte >= 0; |
1051 | byte--) | |
1052 | printf_filtered ("%02x", (unsigned char) raw_buffer[byte]); | |
1053 | } | |
1054 | } | |
1055 | } | |
1056 | ||
1057 | static void | |
1058 | mn10300_do_registers_info (int regnum, int fpregs) | |
1059 | { | |
1060 | if (regnum >= 0) | |
1061 | { | |
1062 | const char *name = REGISTER_NAME (regnum); | |
1063 | if (name == NULL || name[0] == '\0') | |
1064 | error ("Not a valid register for the current processor type"); | |
1065 | mn10300_print_register (name, regnum, 0); | |
1066 | printf_filtered ("\n"); | |
1067 | } | |
1068 | else | |
1069 | { | |
1070 | /* print registers in an array 4x8 */ | |
1071 | int r; | |
1072 | int reg; | |
1073 | const int nr_in_row = 4; | |
1074 | const int reg_width = 4; | |
1075 | for (r = 0; r < NUM_REGS; r += nr_in_row) | |
1076 | { | |
1077 | int c; | |
1078 | int printing = 0; | |
1079 | int padding = 0; | |
1080 | for (c = r; c < r + nr_in_row; c++) | |
1081 | { | |
1082 | const char *name = REGISTER_NAME (c); | |
1083 | if (name != NULL && *name != '\0') | |
1084 | { | |
1085 | printing = 1; | |
1086 | while (padding > 0) | |
1087 | { | |
1088 | printf_filtered (" "); | |
1089 | padding--; | |
1090 | } | |
1091 | mn10300_print_register (name, c, reg_width); | |
1092 | printf_filtered (" "); | |
1093 | } | |
1094 | else | |
1095 | { | |
1096 | padding += (reg_width + 2 + 8 + 1); | |
1097 | } | |
1098 | } | |
1099 | if (printing) | |
1100 | printf_filtered ("\n"); | |
1101 | } | |
1102 | } | |
1103 | } | |
1104 | ||
bd1ce8ba AC |
1105 | static CORE_ADDR |
1106 | mn10300_read_fp (void) | |
1107 | { | |
1108 | /* That's right, we're using the stack pointer as our frame pointer. */ | |
1109 | gdb_assert (SP_REGNUM >= 0); | |
1110 | return read_register (SP_REGNUM); | |
1111 | } | |
1112 | ||
91225883 | 1113 | /* Dump out the mn10300 speciic architecture information. */ |
c906108c | 1114 | |
91225883 AC |
1115 | static void |
1116 | mn10300_dump_tdep (struct gdbarch *current_gdbarch, struct ui_file *file) | |
1117 | { | |
1118 | struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); | |
1119 | fprintf_unfiltered (file, "mn10300_dump_tdep: am33_mode = %d\n", | |
1120 | tdep->am33_mode); | |
1121 | } | |
c2d11a7d | 1122 | |
91225883 AC |
1123 | static struct gdbarch * |
1124 | mn10300_gdbarch_init (struct gdbarch_info info, | |
1125 | struct gdbarch_list *arches) | |
1126 | { | |
ad8fe2ce | 1127 | static LONGEST mn10300_call_dummy_words[] = { 0 }; |
91225883 AC |
1128 | struct gdbarch *gdbarch; |
1129 | struct gdbarch_tdep *tdep = NULL; | |
1130 | int am33_mode; | |
1131 | gdbarch_register_name_ftype *register_name; | |
1132 | int mach; | |
1133 | int num_regs; | |
1134 | ||
1135 | arches = gdbarch_list_lookup_by_info (arches, &info); | |
1136 | if (arches != NULL) | |
1137 | return arches->gdbarch; | |
1138 | tdep = xmalloc (sizeof (struct gdbarch_tdep)); | |
1139 | gdbarch = gdbarch_alloc (&info, tdep); | |
1140 | ||
1141 | if (info.bfd_arch_info != NULL | |
f6df245f | 1142 | && info.bfd_arch_info->arch == bfd_arch_mn10300) |
91225883 AC |
1143 | mach = info.bfd_arch_info->mach; |
1144 | else | |
1145 | mach = 0; | |
1146 | switch (mach) | |
1147 | { | |
1148 | case 0: | |
f6df245f | 1149 | case bfd_mach_mn10300: |
91225883 AC |
1150 | am33_mode = 0; |
1151 | register_name = mn10300_generic_register_name; | |
1152 | num_regs = 32; | |
1153 | break; | |
1154 | case bfd_mach_am33: | |
c2d11a7d | 1155 | am33_mode = 1; |
91225883 AC |
1156 | register_name = am33_register_name; |
1157 | num_regs = 32; | |
1158 | break; | |
1159 | default: | |
8e65ff28 AC |
1160 | internal_error (__FILE__, __LINE__, |
1161 | "mn10300_gdbarch_init: Unknown mn10300 variant"); | |
91225883 | 1162 | return NULL; /* keep GCC happy. */ |
c2d11a7d | 1163 | } |
c906108c | 1164 | |
584f96a8 JB |
1165 | /* Registers. */ |
1166 | set_gdbarch_num_regs (gdbarch, num_regs); | |
1167 | set_gdbarch_register_name (gdbarch, register_name); | |
b1e29e33 | 1168 | set_gdbarch_deprecated_register_size (gdbarch, 4); |
b8b527c5 | 1169 | set_gdbarch_deprecated_register_bytes (gdbarch, num_regs * gdbarch_deprecated_register_size (gdbarch)); |
a0ed5532 | 1170 | set_gdbarch_deprecated_max_register_raw_size (gdbarch, 4); |
9c04cab7 AC |
1171 | set_gdbarch_deprecated_register_raw_size (gdbarch, mn10300_register_raw_size); |
1172 | set_gdbarch_deprecated_register_byte (gdbarch, mn10300_register_byte); | |
a0ed5532 | 1173 | set_gdbarch_deprecated_max_register_virtual_size (gdbarch, 4); |
9c04cab7 AC |
1174 | set_gdbarch_deprecated_register_virtual_size (gdbarch, mn10300_register_virtual_size); |
1175 | set_gdbarch_deprecated_register_virtual_type (gdbarch, mn10300_register_virtual_type); | |
23436510 | 1176 | set_gdbarch_dwarf2_reg_to_regnum (gdbarch, mn10300_dwarf2_reg_to_regnum); |
903ad3a6 | 1177 | set_gdbarch_deprecated_do_registers_info (gdbarch, mn10300_do_registers_info); |
a15525c1 AC |
1178 | set_gdbarch_sp_regnum (gdbarch, 8); |
1179 | set_gdbarch_pc_regnum (gdbarch, 9); | |
0ba6dca9 | 1180 | set_gdbarch_deprecated_fp_regnum (gdbarch, 31); |
39d4ef09 | 1181 | set_gdbarch_virtual_frame_pointer (gdbarch, mn10300_virtual_frame_pointer); |
584f96a8 JB |
1182 | |
1183 | /* Breakpoints. */ | |
ad8fe2ce JB |
1184 | set_gdbarch_breakpoint_from_pc (gdbarch, mn10300_breakpoint_from_pc); |
1185 | set_gdbarch_function_start_offset (gdbarch, 0); | |
1186 | set_gdbarch_decr_pc_after_break (gdbarch, 0); | |
584f96a8 JB |
1187 | |
1188 | /* Stack unwinding. */ | |
ad8fe2ce | 1189 | set_gdbarch_inner_than (gdbarch, core_addr_lessthan); |
6913c89a | 1190 | set_gdbarch_deprecated_saved_pc_after_call (gdbarch, mn10300_saved_pc_after_call); |
e9582e71 | 1191 | set_gdbarch_deprecated_init_extra_frame_info (gdbarch, mn10300_init_extra_frame_info); |
f30ee0bc | 1192 | set_gdbarch_deprecated_frame_init_saved_regs (gdbarch, mn10300_frame_init_saved_regs); |
618ce49f | 1193 | set_gdbarch_deprecated_frame_chain (gdbarch, mn10300_frame_chain); |
8bedc050 | 1194 | set_gdbarch_deprecated_frame_saved_pc (gdbarch, mn10300_frame_saved_pc); |
26e9b323 AC |
1195 | set_gdbarch_deprecated_extract_return_value (gdbarch, mn10300_extract_return_value); |
1196 | set_gdbarch_deprecated_extract_struct_value_address | |
ad8fe2ce | 1197 | (gdbarch, mn10300_extract_struct_value_address); |
ebba8386 | 1198 | set_gdbarch_deprecated_store_return_value (gdbarch, mn10300_store_return_value); |
4183d812 | 1199 | set_gdbarch_deprecated_store_struct_return (gdbarch, mn10300_store_struct_return); |
749b82f6 | 1200 | set_gdbarch_deprecated_pop_frame (gdbarch, mn10300_pop_frame); |
ad8fe2ce JB |
1201 | set_gdbarch_skip_prologue (gdbarch, mn10300_skip_prologue); |
1202 | set_gdbarch_frame_args_skip (gdbarch, 0); | |
ad8fe2ce | 1203 | /* That's right, we're using the stack pointer as our frame pointer. */ |
bd1ce8ba | 1204 | set_gdbarch_deprecated_target_read_fp (gdbarch, mn10300_read_fp); |
584f96a8 JB |
1205 | |
1206 | /* Calling functions in the inferior from GDB. */ | |
b1e29e33 AC |
1207 | set_gdbarch_deprecated_call_dummy_words (gdbarch, mn10300_call_dummy_words); |
1208 | set_gdbarch_deprecated_sizeof_call_dummy_words (gdbarch, sizeof (mn10300_call_dummy_words)); | |
ae45cd16 | 1209 | set_gdbarch_deprecated_pc_in_call_dummy (gdbarch, deprecated_pc_in_call_dummy_at_entry_point); |
b81774d8 | 1210 | set_gdbarch_deprecated_push_arguments (gdbarch, mn10300_push_arguments); |
2110b94f MK |
1211 | set_gdbarch_deprecated_reg_struct_has_addr |
1212 | (gdbarch, mn10300_reg_struct_has_addr); | |
28f617b3 | 1213 | set_gdbarch_deprecated_push_return_address (gdbarch, mn10300_push_return_address); |
a59fe496 | 1214 | set_gdbarch_deprecated_save_dummy_frame_tos (gdbarch, generic_save_dummy_frame_tos); |
ad8fe2ce JB |
1215 | set_gdbarch_use_struct_convention (gdbarch, mn10300_use_struct_convention); |
1216 | ||
91225883 AC |
1217 | tdep->am33_mode = am33_mode; |
1218 | ||
6c0e89ed | 1219 | /* Should be using push_dummy_call. */ |
b46e02f6 | 1220 | set_gdbarch_deprecated_dummy_write_sp (gdbarch, deprecated_write_sp); |
6c0e89ed | 1221 | |
36482093 AC |
1222 | set_gdbarch_print_insn (gdbarch, print_insn_mn10300); |
1223 | ||
91225883 AC |
1224 | return gdbarch; |
1225 | } | |
1226 | ||
c906108c | 1227 | void |
fba45db2 | 1228 | _initialize_mn10300_tdep (void) |
c906108c SS |
1229 | { |
1230 | /* printf("_initialize_mn10300_tdep\n"); */ | |
1231 | ||
91225883 | 1232 | register_gdbarch_init (bfd_arch_mn10300, mn10300_gdbarch_init); |
c906108c | 1233 | } |