Commit | Line | Data |
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0c884e17 | 1 | /* Target-dependent code for the Sanyo Xstormy16a (LC590000) processor. |
f4f9705a | 2 | |
07be497a | 3 | Copyright 2001, 2002, 2003, 2004 Free Software Foundation, Inc. |
0c884e17 CV |
4 | |
5 | This file is part of GDB. | |
6 | ||
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. | |
11 | ||
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. | |
16 | ||
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. */ | |
21 | ||
22 | #include "defs.h" | |
b6fcb393 CV |
23 | #include "frame.h" |
24 | #include "frame-base.h" | |
25 | #include "frame-unwind.h" | |
26 | #include "dwarf2-frame.h" | |
27 | #include "symtab.h" | |
28 | #include "gdbtypes.h" | |
29 | #include "gdbcmd.h" | |
30 | #include "gdbcore.h" | |
0c884e17 | 31 | #include "value.h" |
b6fcb393 | 32 | #include "dis-asm.h" |
0c884e17 | 33 | #include "inferior.h" |
b6fcb393 CV |
34 | #include "gdb_string.h" |
35 | #include "gdb_assert.h" | |
0c884e17 | 36 | #include "arch-utils.h" |
b6fcb393 | 37 | #include "floatformat.h" |
0c884e17 | 38 | #include "regcache.h" |
b6fcb393 CV |
39 | #include "doublest.h" |
40 | #include "osabi.h" | |
0c884e17 | 41 | #include "objfiles.h" |
0c884e17 CV |
42 | |
43 | enum gdb_regnum | |
44 | { | |
45 | /* Xstormy16 has 16 general purpose registers (R0-R15) plus PC. | |
46 | Functions will return their values in register R2-R7 as they fit. | |
47 | Otherwise a hidden pointer to an big enough area is given as argument | |
48 | to the function in r2. Further arguments are beginning in r3 then. | |
49 | R13 is used as frame pointer when GCC compiles w/o optimization | |
50 | R14 is used as "PSW", displaying the CPU status. | |
51 | R15 is used implicitely as stack pointer. */ | |
52 | E_R0_REGNUM, | |
53 | E_R1_REGNUM, | |
54 | E_R2_REGNUM, E_1ST_ARG_REGNUM = E_R2_REGNUM, E_PTR_RET_REGNUM = E_R2_REGNUM, | |
55 | E_R3_REGNUM, | |
56 | E_R4_REGNUM, | |
57 | E_R5_REGNUM, | |
58 | E_R6_REGNUM, | |
59 | E_R7_REGNUM, E_LST_ARG_REGNUM = E_R7_REGNUM, | |
60 | E_R8_REGNUM, | |
61 | E_R9_REGNUM, | |
62 | E_R10_REGNUM, | |
63 | E_R11_REGNUM, | |
64 | E_R12_REGNUM, | |
65 | E_R13_REGNUM, E_FP_REGNUM = E_R13_REGNUM, | |
66 | E_R14_REGNUM, E_PSW_REGNUM = E_R14_REGNUM, | |
67 | E_R15_REGNUM, E_SP_REGNUM = E_R15_REGNUM, | |
68 | E_PC_REGNUM, | |
69 | E_NUM_REGS | |
70 | }; | |
71 | ||
b6fcb393 CV |
72 | /* Use an invalid address value as 'not available' marker. */ |
73 | enum { REG_UNAVAIL = (CORE_ADDR) -1 }; | |
74 | ||
75 | struct xstormy16_frame_cache | |
76 | { | |
77 | /* Base address. */ | |
78 | CORE_ADDR base; | |
79 | CORE_ADDR pc; | |
80 | LONGEST framesize; | |
81 | int uses_fp; | |
82 | CORE_ADDR saved_regs[E_NUM_REGS]; | |
83 | CORE_ADDR saved_sp; | |
84 | }; | |
85 | ||
0c884e17 CV |
86 | /* Size of instructions, registers, etc. */ |
87 | enum | |
88 | { | |
89 | xstormy16_inst_size = 2, | |
90 | xstormy16_reg_size = 2, | |
91 | xstormy16_pc_size = 4 | |
92 | }; | |
93 | ||
94 | /* Size of return datatype which fits into the remaining return registers. */ | |
95 | #define E_MAX_RETTYPE_SIZE(regnum) ((E_LST_ARG_REGNUM - (regnum) + 1) \ | |
96 | * xstormy16_reg_size) | |
97 | ||
98 | /* Size of return datatype which fits into all return registers. */ | |
99 | enum | |
100 | { | |
101 | E_MAX_RETTYPE_SIZE_IN_REGS = E_MAX_RETTYPE_SIZE (E_R2_REGNUM) | |
102 | }; | |
103 | ||
0c884e17 | 104 | /* Function: xstormy16_register_name |
b6fcb393 | 105 | Returns the name of the standard Xstormy16 register N. */ |
0c884e17 | 106 | |
fa88f677 | 107 | static const char * |
0c884e17 CV |
108 | xstormy16_register_name (int regnum) |
109 | { | |
110 | static char *register_names[] = { | |
111 | "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", | |
112 | "r8", "r9", "r10", "r11", "r12", "r13", | |
113 | "psw", "sp", "pc" | |
114 | }; | |
115 | ||
b6fcb393 | 116 | if (regnum < 0 || regnum >= E_NUM_REGS) |
0c884e17 CV |
117 | internal_error (__FILE__, __LINE__, |
118 | "xstormy16_register_name: illegal register number %d", | |
119 | regnum); | |
120 | else | |
121 | return register_names[regnum]; | |
122 | ||
123 | } | |
124 | ||
0c884e17 | 125 | static struct type * |
b6fcb393 | 126 | xstormy16_register_type (struct gdbarch *gdbarch, int regnum) |
0c884e17 | 127 | { |
b6fcb393 | 128 | if (regnum == E_PC_REGNUM) |
0c884e17 CV |
129 | return builtin_type_uint32; |
130 | else | |
131 | return builtin_type_uint16; | |
132 | } | |
133 | ||
0c884e17 CV |
134 | /* Function: xstormy16_type_is_scalar |
135 | Makes the decision if a given type is a scalar types. Scalar | |
b6fcb393 | 136 | types are returned in the registers r2-r7 as they fit. */ |
0c884e17 CV |
137 | |
138 | static int | |
139 | xstormy16_type_is_scalar (struct type *t) | |
140 | { | |
141 | return (TYPE_CODE(t) != TYPE_CODE_STRUCT | |
142 | && TYPE_CODE(t) != TYPE_CODE_UNION | |
143 | && TYPE_CODE(t) != TYPE_CODE_ARRAY); | |
144 | } | |
145 | ||
b6fcb393 CV |
146 | /* Function: xstormy16_use_struct_convention |
147 | Returns non-zero if the given struct type will be returned using | |
148 | a special convention, rather than the normal function return method. | |
149 | 7sed in the contexts of the "return" command, and of | |
150 | target function calls from the debugger. */ | |
151 | ||
152 | static int | |
153 | xstormy16_use_struct_convention (struct type *type) | |
154 | { | |
155 | return !xstormy16_type_is_scalar (type) | |
156 | || TYPE_LENGTH (type) > E_MAX_RETTYPE_SIZE_IN_REGS; | |
157 | } | |
158 | ||
0c884e17 | 159 | /* Function: xstormy16_extract_return_value |
b6fcb393 CV |
160 | Find a function's return value in the appropriate registers (in |
161 | regbuf), and copy it into valbuf. */ | |
0c884e17 CV |
162 | |
163 | static void | |
b6fcb393 CV |
164 | xstormy16_extract_return_value (struct type *type, struct regcache *regcache, |
165 | void *valbuf) | |
0c884e17 | 166 | { |
b6fcb393 CV |
167 | int len = TYPE_LENGTH (type); |
168 | int i, regnum = E_1ST_ARG_REGNUM; | |
0c884e17 | 169 | |
b6fcb393 CV |
170 | for (i = 0; i < len; i += xstormy16_reg_size) |
171 | regcache_raw_read (regcache, regnum++, (char *) valbuf + i); | |
172 | } | |
173 | ||
174 | /* Function: xstormy16_store_return_value | |
175 | Copy the function return value from VALBUF into the | |
176 | proper location for a function return. | |
177 | Called only in the context of the "return" command. */ | |
178 | ||
179 | static void | |
180 | xstormy16_store_return_value (struct type *type, struct regcache *regcache, | |
181 | const void *valbuf) | |
182 | { | |
183 | if (TYPE_LENGTH (type) == 1) | |
184 | { | |
185 | /* Add leading zeros to the value. */ | |
186 | char buf[xstormy16_reg_size]; | |
187 | memset (buf, 0, xstormy16_reg_size); | |
188 | memcpy (buf, valbuf, 1); | |
189 | regcache_raw_write (regcache, E_1ST_ARG_REGNUM, buf); | |
0c884e17 CV |
190 | } |
191 | else | |
192 | { | |
b6fcb393 CV |
193 | int len = TYPE_LENGTH (type); |
194 | int i, regnum = E_1ST_ARG_REGNUM; | |
0c884e17 | 195 | |
b6fcb393 CV |
196 | for (i = 0; i < len; i += xstormy16_reg_size) |
197 | regcache_raw_write (regcache, regnum++, (char *) valbuf + i); | |
0c884e17 CV |
198 | } |
199 | } | |
200 | ||
b6fcb393 CV |
201 | static enum return_value_convention |
202 | xstormy16_return_value (struct gdbarch *gdbarch, struct type *type, | |
203 | struct regcache *regcache, | |
204 | void *readbuf, const void *writebuf) | |
205 | { | |
206 | if (xstormy16_use_struct_convention (type)) | |
207 | return RETURN_VALUE_STRUCT_CONVENTION; | |
208 | if (writebuf) | |
209 | xstormy16_store_return_value (type, regcache, writebuf); | |
210 | else if (readbuf) | |
211 | xstormy16_extract_return_value (type, regcache, readbuf); | |
212 | return RETURN_VALUE_REGISTER_CONVENTION; | |
213 | } | |
214 | ||
215 | static CORE_ADDR | |
216 | xstormy16_frame_align (struct gdbarch *gdbarch, CORE_ADDR addr) | |
217 | { | |
218 | if (addr & 1) | |
219 | ++addr; | |
220 | return addr; | |
221 | } | |
222 | ||
223 | /* Function: xstormy16_push_dummy_call | |
0c884e17 CV |
224 | Setup the function arguments for GDB to call a function in the inferior. |
225 | Called only in the context of a target function call from the debugger. | |
b6fcb393 | 226 | Returns the value of the SP register after the args are pushed. */ |
0c884e17 CV |
227 | |
228 | static CORE_ADDR | |
b6fcb393 CV |
229 | xstormy16_push_dummy_call (struct gdbarch *gdbarch, |
230 | struct value *function, | |
231 | struct regcache *regcache, | |
232 | CORE_ADDR bp_addr, int nargs, | |
233 | struct value **args, | |
234 | CORE_ADDR sp, int struct_return, | |
235 | CORE_ADDR struct_addr) | |
0c884e17 CV |
236 | { |
237 | CORE_ADDR stack_dest = sp; | |
238 | int argreg = E_1ST_ARG_REGNUM; | |
239 | int i, j; | |
240 | int typelen, slacklen; | |
241 | char *val; | |
b6fcb393 | 242 | char buf[xstormy16_pc_size]; |
0c884e17 CV |
243 | |
244 | /* If struct_return is true, then the struct return address will | |
245 | consume one argument-passing register. */ | |
246 | if (struct_return) | |
b6fcb393 CV |
247 | { |
248 | regcache_cooked_write_unsigned (regcache, E_PTR_RET_REGNUM, struct_addr); | |
249 | argreg++; | |
250 | } | |
0c884e17 CV |
251 | |
252 | /* Arguments are passed in R2-R7 as they fit. If an argument doesn't | |
253 | fit in the remaining registers we're switching over to the stack. | |
254 | No argument is put on stack partially and as soon as we switched | |
255 | over to stack no further argument is put in a register even if it | |
b6fcb393 | 256 | would fit in the remaining unused registers. */ |
0c884e17 CV |
257 | for (i = 0; i < nargs && argreg <= E_LST_ARG_REGNUM; i++) |
258 | { | |
259 | typelen = TYPE_LENGTH (VALUE_ENCLOSING_TYPE (args[i])); | |
260 | if (typelen > E_MAX_RETTYPE_SIZE (argreg)) | |
261 | break; | |
262 | ||
263 | /* Put argument into registers wordwise. */ | |
264 | val = VALUE_CONTENTS (args[i]); | |
265 | for (j = 0; j < typelen; j += xstormy16_reg_size) | |
b6fcb393 | 266 | regcache_cooked_write_unsigned (regcache, argreg++, |
0c884e17 CV |
267 | extract_unsigned_integer (val + j, |
268 | typelen - j == | |
269 | 1 ? 1 : | |
270 | xstormy16_reg_size)); | |
271 | } | |
272 | ||
273 | /* Align SP */ | |
b6fcb393 | 274 | stack_dest = xstormy16_frame_align (gdbarch, stack_dest); |
0c884e17 CV |
275 | |
276 | /* Loop backwards through remaining arguments and push them on the stack, | |
b6fcb393 | 277 | wordaligned. */ |
0c884e17 CV |
278 | for (j = nargs - 1; j >= i; j--) |
279 | { | |
280 | typelen = TYPE_LENGTH (VALUE_ENCLOSING_TYPE (args[j])); | |
281 | slacklen = typelen & 1; | |
282 | val = alloca (typelen + slacklen); | |
283 | memcpy (val, VALUE_CONTENTS (args[j]), typelen); | |
284 | memset (val + typelen, 0, slacklen); | |
285 | ||
286 | /* Now write this data to the stack. The stack grows upwards. */ | |
287 | write_memory (stack_dest, val, typelen + slacklen); | |
288 | stack_dest += typelen + slacklen; | |
289 | } | |
290 | ||
b6fcb393 CV |
291 | store_unsigned_integer (buf, xstormy16_pc_size, bp_addr); |
292 | write_memory (stack_dest, buf, xstormy16_pc_size); | |
293 | stack_dest += xstormy16_pc_size; | |
0c884e17 | 294 | |
b6fcb393 CV |
295 | /* Update stack pointer. */ |
296 | regcache_cooked_write_unsigned (regcache, E_SP_REGNUM, stack_dest); | |
0c884e17 | 297 | |
b6fcb393 CV |
298 | /* Return the new stack pointer minus the return address slot since |
299 | that's what DWARF2/GCC uses as the frame's CFA. */ | |
300 | return stack_dest - xstormy16_pc_size; | |
0c884e17 CV |
301 | } |
302 | ||
303 | /* Function: xstormy16_scan_prologue | |
304 | Decode the instructions within the given address range. | |
305 | Decide when we must have reached the end of the function prologue. | |
306 | If a frame_info pointer is provided, fill in its saved_regs etc. | |
307 | ||
b6fcb393 | 308 | Returns the address of the first instruction after the prologue. */ |
0c884e17 CV |
309 | |
310 | static CORE_ADDR | |
b6fcb393 CV |
311 | xstormy16_analyze_prologue (CORE_ADDR start_addr, CORE_ADDR end_addr, |
312 | struct xstormy16_frame_cache *cache, | |
313 | struct frame_info *next_frame) | |
0c884e17 | 314 | { |
0c884e17 CV |
315 | CORE_ADDR next_addr; |
316 | ULONGEST inst, inst2; | |
317 | LONGEST offset; | |
318 | int regnum; | |
319 | ||
b6fcb393 CV |
320 | /* Initialize framesize with size of PC put on stack by CALLF inst. */ |
321 | cache->saved_regs[E_PC_REGNUM] = 0; | |
322 | cache->framesize = xstormy16_pc_size; | |
323 | ||
324 | if (start_addr >= end_addr) | |
325 | return end_addr; | |
326 | ||
0c884e17 CV |
327 | for (next_addr = start_addr; |
328 | next_addr < end_addr; next_addr += xstormy16_inst_size) | |
329 | { | |
330 | inst = read_memory_unsigned_integer (next_addr, xstormy16_inst_size); | |
331 | inst2 = read_memory_unsigned_integer (next_addr + xstormy16_inst_size, | |
332 | xstormy16_inst_size); | |
333 | ||
334 | if (inst >= 0x0082 && inst <= 0x008d) /* push r2 .. push r13 */ | |
335 | { | |
b6fcb393 CV |
336 | regnum = inst & 0x000f; |
337 | cache->saved_regs[regnum] = cache->framesize; | |
338 | cache->framesize += xstormy16_reg_size; | |
0c884e17 CV |
339 | } |
340 | ||
341 | /* optional stack allocation for args and local vars <= 4 byte */ | |
342 | else if (inst == 0x301f || inst == 0x303f) /* inc r15, #0x1/#0x3 */ | |
343 | { | |
b6fcb393 | 344 | cache->framesize += ((inst & 0x0030) >> 4) + 1; |
0c884e17 CV |
345 | } |
346 | ||
347 | /* optional stack allocation for args and local vars > 4 && < 16 byte */ | |
348 | else if ((inst & 0xff0f) == 0x510f) /* 51Hf add r15, #0xH */ | |
349 | { | |
b6fcb393 | 350 | cache->framesize += (inst & 0x00f0) >> 4; |
0c884e17 CV |
351 | } |
352 | ||
353 | /* optional stack allocation for args and local vars >= 16 byte */ | |
354 | else if (inst == 0x314f && inst2 >= 0x0010) /* 314f HHHH add r15, #0xH */ | |
355 | { | |
b6fcb393 | 356 | cache->framesize += inst2; |
0c884e17 CV |
357 | next_addr += xstormy16_inst_size; |
358 | } | |
359 | ||
360 | else if (inst == 0x46fd) /* mov r13, r15 */ | |
361 | { | |
b6fcb393 | 362 | cache->uses_fp = 1; |
0c884e17 CV |
363 | } |
364 | ||
365 | /* optional copying of args in r2-r7 to r10-r13 */ | |
366 | /* Probably only in optimized case but legal action for prologue */ | |
367 | else if ((inst & 0xff00) == 0x4600 /* 46SD mov rD, rS */ | |
368 | && (inst & 0x00f0) >= 0x0020 && (inst & 0x00f0) <= 0x0070 | |
369 | && (inst & 0x000f) >= 0x00a0 && (inst & 0x000f) <= 0x000d) | |
370 | ; | |
371 | ||
372 | /* optional copying of args in r2-r7 to stack */ | |
373 | /* 72DS HHHH mov.b (rD, 0xHHHH), r(S-8) (bit3 always 1, bit2-0 = reg) */ | |
374 | /* 73DS HHHH mov.w (rD, 0xHHHH), r(S-8) */ | |
375 | else if ((inst & 0xfed8) == 0x72d8 && (inst & 0x0007) >= 2) | |
376 | { | |
b6fcb393 CV |
377 | regnum = inst & 0x0007; |
378 | /* Only 12 of 16 bits of the argument are used for the | |
379 | signed offset. */ | |
380 | offset = (LONGEST) (inst2 & 0x0fff); | |
381 | if (offset & 0x0800) | |
382 | offset -= 0x1000; | |
383 | ||
384 | cache->saved_regs[regnum] = cache->framesize + offset; | |
0c884e17 CV |
385 | next_addr += xstormy16_inst_size; |
386 | } | |
0c884e17 CV |
387 | |
388 | else /* Not a prologue instruction. */ | |
389 | break; | |
390 | } | |
391 | ||
0c884e17 CV |
392 | return next_addr; |
393 | } | |
394 | ||
395 | /* Function: xstormy16_skip_prologue | |
396 | If the input address is in a function prologue, | |
397 | returns the address of the end of the prologue; | |
398 | else returns the input address. | |
399 | ||
400 | Note: the input address is likely to be the function start, | |
401 | since this function is mainly used for advancing a breakpoint | |
402 | to the first line, or stepping to the first line when we have | |
403 | stepped into a function call. */ | |
404 | ||
405 | static CORE_ADDR | |
406 | xstormy16_skip_prologue (CORE_ADDR pc) | |
407 | { | |
408 | CORE_ADDR func_addr = 0, func_end = 0; | |
409 | char *func_name; | |
410 | ||
411 | if (find_pc_partial_function (pc, &func_name, &func_addr, &func_end)) | |
412 | { | |
413 | struct symtab_and_line sal; | |
414 | struct symbol *sym; | |
b6fcb393 | 415 | struct xstormy16_frame_cache cache; |
0c884e17 | 416 | |
211a4f69 | 417 | /* Don't trust line number debug info in frameless functions. */ |
b6fcb393 CV |
418 | CORE_ADDR plg_end = xstormy16_analyze_prologue (func_addr, func_end, |
419 | &cache, NULL); | |
420 | if (!cache.uses_fp) | |
211a4f69 CV |
421 | return plg_end; |
422 | ||
0c884e17 | 423 | /* Found a function. */ |
176620f1 | 424 | sym = lookup_symbol (func_name, NULL, VAR_DOMAIN, NULL, NULL); |
211a4f69 | 425 | /* Don't use line number debug info for assembly source files. */ |
0c884e17 CV |
426 | if (sym && SYMBOL_LANGUAGE (sym) != language_asm) |
427 | { | |
0c884e17 CV |
428 | sal = find_pc_line (func_addr, 0); |
429 | if (sal.end && sal.end < func_end) | |
430 | { | |
431 | /* Found a line number, use it as end of prologue. */ | |
432 | return sal.end; | |
433 | } | |
434 | } | |
211a4f69 CV |
435 | /* No useable line symbol. Use result of prologue parsing method. */ |
436 | return plg_end; | |
0c884e17 CV |
437 | } |
438 | ||
439 | /* No function symbol -- just return the PC. */ | |
440 | ||
441 | return (CORE_ADDR) pc; | |
442 | } | |
443 | ||
444 | /* The epilogue is defined here as the area at the end of a function, | |
445 | either on the `ret' instruction itself or after an instruction which | |
446 | destroys the function's stack frame. */ | |
447 | static int | |
448 | xstormy16_in_function_epilogue_p (struct gdbarch *gdbarch, CORE_ADDR pc) | |
449 | { | |
b6fcb393 | 450 | CORE_ADDR func_addr = 0, func_end = 0; |
0c884e17 CV |
451 | |
452 | if (find_pc_partial_function (pc, NULL, &func_addr, &func_end)) | |
453 | { | |
454 | ULONGEST inst, inst2; | |
455 | CORE_ADDR addr = func_end - xstormy16_inst_size; | |
456 | ||
457 | /* The Xstormy16 epilogue is max. 14 bytes long. */ | |
458 | if (pc < func_end - 7 * xstormy16_inst_size) | |
459 | return 0; | |
460 | ||
461 | /* Check if we're on a `ret' instruction. Otherwise it's | |
462 | too dangerous to proceed. */ | |
463 | inst = read_memory_unsigned_integer (addr, xstormy16_inst_size); | |
464 | if (inst != 0x0003) | |
465 | return 0; | |
466 | ||
467 | while ((addr -= xstormy16_inst_size) >= func_addr) | |
468 | { | |
469 | inst = read_memory_unsigned_integer (addr, xstormy16_inst_size); | |
470 | if (inst >= 0x009a && inst <= 0x009d) /* pop r10...r13 */ | |
471 | continue; | |
472 | if (inst == 0x305f || inst == 0x307f) /* dec r15, #0x1/#0x3 */ | |
473 | break; | |
474 | inst2 = read_memory_unsigned_integer (addr - xstormy16_inst_size, | |
475 | xstormy16_inst_size); | |
476 | if (inst2 == 0x314f && inst >= 0x8000) /* add r15, neg. value */ | |
477 | { | |
478 | addr -= xstormy16_inst_size; | |
479 | break; | |
480 | } | |
481 | return 0; | |
482 | } | |
483 | if (pc > addr) | |
484 | return 1; | |
485 | } | |
486 | return 0; | |
487 | } | |
488 | ||
f4f9705a | 489 | const static unsigned char * |
0c884e17 CV |
490 | xstormy16_breakpoint_from_pc (CORE_ADDR *pcptr, int *lenptr) |
491 | { | |
492 | static unsigned char breakpoint[] = { 0x06, 0x0 }; | |
493 | *lenptr = sizeof (breakpoint); | |
494 | return breakpoint; | |
495 | } | |
496 | ||
497 | /* Given a pointer to a jump table entry, return the address | |
498 | of the function it jumps to. Return 0 if not found. */ | |
499 | static CORE_ADDR | |
500 | xstormy16_resolve_jmp_table_entry (CORE_ADDR faddr) | |
501 | { | |
502 | struct obj_section *faddr_sect = find_pc_section (faddr); | |
503 | ||
504 | if (faddr_sect) | |
505 | { | |
506 | LONGEST inst, inst2, addr; | |
507 | char buf[2 * xstormy16_inst_size]; | |
508 | ||
509 | /* Return faddr if it's not pointing into the jump table. */ | |
510 | if (strcmp (faddr_sect->the_bfd_section->name, ".plt")) | |
511 | return faddr; | |
512 | ||
513 | if (!target_read_memory (faddr, buf, sizeof buf)) | |
514 | { | |
515 | inst = extract_unsigned_integer (buf, xstormy16_inst_size); | |
516 | inst2 = extract_unsigned_integer (buf + xstormy16_inst_size, | |
517 | xstormy16_inst_size); | |
518 | addr = inst2 << 8 | (inst & 0xff); | |
519 | return addr; | |
520 | } | |
521 | } | |
522 | return 0; | |
523 | } | |
524 | ||
525 | /* Given a function's address, attempt to find (and return) the | |
526 | address of the corresponding jump table entry. Return 0 if | |
527 | not found. */ | |
528 | static CORE_ADDR | |
529 | xstormy16_find_jmp_table_entry (CORE_ADDR faddr) | |
530 | { | |
531 | struct obj_section *faddr_sect = find_pc_section (faddr); | |
532 | ||
533 | if (faddr_sect) | |
534 | { | |
535 | struct obj_section *osect; | |
536 | ||
537 | /* Return faddr if it's already a pointer to a jump table entry. */ | |
538 | if (!strcmp (faddr_sect->the_bfd_section->name, ".plt")) | |
539 | return faddr; | |
540 | ||
541 | ALL_OBJFILE_OSECTIONS (faddr_sect->objfile, osect) | |
542 | { | |
543 | if (!strcmp (osect->the_bfd_section->name, ".plt")) | |
544 | break; | |
545 | } | |
546 | ||
547 | if (osect < faddr_sect->objfile->sections_end) | |
548 | { | |
549 | CORE_ADDR addr; | |
550 | for (addr = osect->addr; | |
551 | addr < osect->endaddr; addr += 2 * xstormy16_inst_size) | |
552 | { | |
0c884e17 CV |
553 | LONGEST inst, inst2, faddr2; |
554 | char buf[2 * xstormy16_inst_size]; | |
555 | ||
556 | if (target_read_memory (addr, buf, sizeof buf)) | |
557 | return 0; | |
558 | inst = extract_unsigned_integer (buf, xstormy16_inst_size); | |
559 | inst2 = extract_unsigned_integer (buf + xstormy16_inst_size, | |
560 | xstormy16_inst_size); | |
561 | faddr2 = inst2 << 8 | (inst & 0xff); | |
562 | if (faddr == faddr2) | |
563 | return addr; | |
564 | } | |
565 | } | |
566 | } | |
567 | return 0; | |
568 | } | |
569 | ||
570 | static CORE_ADDR | |
571 | xstormy16_skip_trampoline_code (CORE_ADDR pc) | |
572 | { | |
b6fcb393 | 573 | CORE_ADDR tmp = xstormy16_resolve_jmp_table_entry (pc); |
0c884e17 CV |
574 | |
575 | if (tmp && tmp != pc) | |
576 | return tmp; | |
577 | return 0; | |
578 | } | |
579 | ||
580 | static int | |
581 | xstormy16_in_solib_call_trampoline (CORE_ADDR pc, char *name) | |
582 | { | |
583 | return xstormy16_skip_trampoline_code (pc) != 0; | |
584 | } | |
585 | ||
b6fcb393 CV |
586 | /* Function pointers are 16 bit. The address space is 24 bit, using |
587 | 32 bit addresses. Pointers to functions on the XStormy16 are implemented | |
588 | by using 16 bit pointers, which are either direct pointers in case the | |
589 | function begins below 0x10000, or indirect pointers into a jump table. | |
590 | The next two functions convert 16 bit pointers into 24 (32) bit addresses | |
591 | and vice versa. */ | |
592 | ||
0c884e17 | 593 | static CORE_ADDR |
66140c26 | 594 | xstormy16_pointer_to_address (struct type *type, const void *buf) |
0c884e17 CV |
595 | { |
596 | enum type_code target = TYPE_CODE (TYPE_TARGET_TYPE (type)); | |
7c0b4a20 | 597 | CORE_ADDR addr = extract_unsigned_integer (buf, TYPE_LENGTH (type)); |
0c884e17 CV |
598 | |
599 | if (target == TYPE_CODE_FUNC || target == TYPE_CODE_METHOD) | |
600 | { | |
601 | CORE_ADDR addr2 = xstormy16_resolve_jmp_table_entry (addr); | |
602 | if (addr2) | |
603 | addr = addr2; | |
604 | } | |
605 | ||
606 | return addr; | |
607 | } | |
608 | ||
609 | static void | |
610 | xstormy16_address_to_pointer (struct type *type, void *buf, CORE_ADDR addr) | |
611 | { | |
612 | enum type_code target = TYPE_CODE (TYPE_TARGET_TYPE (type)); | |
613 | ||
614 | if (target == TYPE_CODE_FUNC || target == TYPE_CODE_METHOD) | |
615 | { | |
616 | CORE_ADDR addr2 = xstormy16_find_jmp_table_entry (addr); | |
617 | if (addr2) | |
618 | addr = addr2; | |
619 | } | |
fbd9dcd3 | 620 | store_unsigned_integer (buf, TYPE_LENGTH (type), addr); |
0c884e17 CV |
621 | } |
622 | ||
b6fcb393 CV |
623 | static struct xstormy16_frame_cache * |
624 | xstormy16_alloc_frame_cache (void) | |
0c884e17 | 625 | { |
b6fcb393 CV |
626 | struct xstormy16_frame_cache *cache; |
627 | int i; | |
628 | ||
629 | cache = FRAME_OBSTACK_ZALLOC (struct xstormy16_frame_cache); | |
630 | ||
631 | cache->base = 0; | |
632 | cache->saved_sp = 0; | |
633 | cache->pc = 0; | |
634 | cache->uses_fp = 0; | |
635 | cache->framesize = 0; | |
636 | for (i = 0; i < E_NUM_REGS; ++i) | |
637 | cache->saved_regs[i] = REG_UNAVAIL; | |
638 | ||
639 | return cache; | |
640 | } | |
641 | ||
642 | static struct xstormy16_frame_cache * | |
643 | xstormy16_frame_cache (struct frame_info *next_frame, void **this_cache) | |
644 | { | |
645 | struct xstormy16_frame_cache *cache; | |
646 | CORE_ADDR current_pc; | |
647 | int i; | |
648 | ||
649 | if (*this_cache) | |
650 | return *this_cache; | |
651 | ||
652 | cache = xstormy16_alloc_frame_cache (); | |
653 | *this_cache = cache; | |
654 | ||
655 | cache->base = frame_unwind_register_unsigned (next_frame, E_FP_REGNUM); | |
656 | if (cache->base == 0) | |
657 | return cache; | |
658 | ||
659 | cache->pc = frame_func_unwind (next_frame); | |
660 | current_pc = frame_pc_unwind (next_frame); | |
661 | if (cache->pc) | |
662 | xstormy16_analyze_prologue (cache->pc, current_pc, cache, next_frame); | |
663 | ||
664 | if (!cache->uses_fp) | |
665 | cache->base = frame_unwind_register_unsigned (next_frame, E_SP_REGNUM); | |
666 | ||
667 | cache->saved_sp = cache->base - cache->framesize; | |
668 | ||
669 | for (i = 0; i < E_NUM_REGS; ++i) | |
670 | if (cache->saved_regs[i] != REG_UNAVAIL) | |
671 | cache->saved_regs[i] += cache->saved_sp; | |
672 | ||
673 | return cache; | |
0c884e17 CV |
674 | } |
675 | ||
a78f21af | 676 | static void |
b6fcb393 CV |
677 | xstormy16_frame_prev_register (struct frame_info *next_frame, void **this_cache, |
678 | int regnum, int *optimizedp, | |
679 | enum lval_type *lvalp, CORE_ADDR *addrp, | |
680 | int *realnump, void *valuep) | |
681 | { | |
682 | struct xstormy16_frame_cache *cache = xstormy16_frame_cache (next_frame, | |
683 | this_cache); | |
684 | gdb_assert (regnum >= 0); | |
685 | ||
686 | if (regnum == E_SP_REGNUM && cache->saved_sp) | |
687 | { | |
688 | *optimizedp = 0; | |
689 | *lvalp = not_lval; | |
690 | *addrp = 0; | |
691 | *realnump = -1; | |
692 | if (valuep) | |
693 | { | |
694 | /* Store the value. */ | |
695 | store_unsigned_integer (valuep, xstormy16_reg_size, cache->saved_sp); | |
696 | } | |
697 | return; | |
698 | } | |
699 | ||
700 | if (regnum < E_NUM_REGS && cache->saved_regs[regnum] != REG_UNAVAIL) | |
701 | { | |
702 | *optimizedp = 0; | |
703 | *lvalp = lval_memory; | |
704 | *addrp = cache->saved_regs[regnum]; | |
705 | *realnump = -1; | |
706 | if (valuep) | |
707 | { | |
708 | /* Read the value in from memory. */ | |
709 | read_memory (*addrp, valuep, | |
710 | register_size (current_gdbarch, regnum)); | |
711 | } | |
712 | return; | |
713 | } | |
714 | ||
715 | frame_register_unwind (next_frame, regnum, | |
716 | optimizedp, lvalp, addrp, realnump, valuep); | |
717 | } | |
718 | ||
719 | static void | |
720 | xstormy16_frame_this_id (struct frame_info *next_frame, void **this_cache, | |
721 | struct frame_id *this_id) | |
722 | { | |
723 | struct xstormy16_frame_cache *cache = xstormy16_frame_cache (next_frame, | |
724 | this_cache); | |
725 | ||
726 | /* This marks the outermost frame. */ | |
727 | if (cache->base == 0) | |
728 | return; | |
729 | ||
730 | *this_id = frame_id_build (cache->saved_sp, cache->pc); | |
731 | } | |
732 | ||
733 | static CORE_ADDR | |
734 | xstormy16_frame_base_address (struct frame_info *next_frame, void **this_cache) | |
735 | { | |
736 | struct xstormy16_frame_cache *cache = xstormy16_frame_cache (next_frame, | |
737 | this_cache); | |
738 | return cache->base; | |
739 | } | |
740 | ||
741 | static const struct frame_unwind xstormy16_frame_unwind = { | |
742 | NORMAL_FRAME, | |
743 | xstormy16_frame_this_id, | |
744 | xstormy16_frame_prev_register | |
745 | }; | |
746 | ||
747 | static const struct frame_base xstormy16_frame_base = { | |
748 | &xstormy16_frame_unwind, | |
749 | xstormy16_frame_base_address, | |
750 | xstormy16_frame_base_address, | |
751 | xstormy16_frame_base_address | |
752 | }; | |
753 | ||
754 | static const struct frame_unwind * | |
755 | xstormy16_frame_sniffer (struct frame_info *next_frame) | |
756 | { | |
757 | return &xstormy16_frame_unwind; | |
758 | } | |
759 | ||
760 | static CORE_ADDR | |
761 | xstormy16_unwind_sp (struct gdbarch *gdbarch, struct frame_info *next_frame) | |
762 | { | |
763 | return frame_unwind_register_unsigned (next_frame, E_SP_REGNUM); | |
764 | } | |
765 | ||
766 | static CORE_ADDR | |
767 | xstormy16_unwind_pc (struct gdbarch *gdbarch, struct frame_info *next_frame) | |
0c884e17 | 768 | { |
b6fcb393 | 769 | return frame_unwind_register_unsigned (next_frame, E_PC_REGNUM); |
0c884e17 CV |
770 | } |
771 | ||
b6fcb393 CV |
772 | static struct frame_id |
773 | xstormy16_unwind_dummy_id (struct gdbarch *gdbarch, | |
774 | struct frame_info *next_frame) | |
775 | { | |
776 | return frame_id_build (xstormy16_unwind_sp (gdbarch, next_frame), | |
777 | frame_pc_unwind (next_frame)); | |
778 | } | |
779 | ||
780 | ||
0c884e17 CV |
781 | /* Function: xstormy16_gdbarch_init |
782 | Initializer function for the xstormy16 gdbarch vector. | |
783 | Called by gdbarch. Sets up the gdbarch vector(s) for this target. */ | |
784 | ||
785 | static struct gdbarch * | |
786 | xstormy16_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches) | |
787 | { | |
0c884e17 CV |
788 | struct gdbarch *gdbarch; |
789 | ||
790 | /* find a candidate among the list of pre-declared architectures. */ | |
791 | arches = gdbarch_list_lookup_by_info (arches, &info); | |
792 | if (arches != NULL) | |
793 | return (arches->gdbarch); | |
794 | ||
b6fcb393 | 795 | gdbarch = gdbarch_alloc (&info, NULL); |
a5afb99f | 796 | |
0c884e17 | 797 | /* |
b6fcb393 | 798 | * Basic register fields and methods, datatype sizes and stuff. |
0c884e17 CV |
799 | */ |
800 | ||
801 | set_gdbarch_num_regs (gdbarch, E_NUM_REGS); | |
802 | set_gdbarch_num_pseudo_regs (gdbarch, 0); | |
803 | set_gdbarch_sp_regnum (gdbarch, E_SP_REGNUM); | |
0c884e17 CV |
804 | set_gdbarch_pc_regnum (gdbarch, E_PC_REGNUM); |
805 | set_gdbarch_register_name (gdbarch, xstormy16_register_name); | |
b6fcb393 | 806 | set_gdbarch_register_type (gdbarch, xstormy16_register_type); |
0c884e17 | 807 | |
71c08af0 | 808 | set_gdbarch_char_signed (gdbarch, 0); |
b6fcb393 | 809 | set_gdbarch_short_bit (gdbarch, 2 * TARGET_CHAR_BIT); |
0c884e17 | 810 | set_gdbarch_int_bit (gdbarch, 2 * TARGET_CHAR_BIT); |
b6fcb393 CV |
811 | set_gdbarch_long_bit (gdbarch, 4 * TARGET_CHAR_BIT); |
812 | set_gdbarch_long_long_bit (gdbarch, 8 * TARGET_CHAR_BIT); | |
813 | ||
814 | set_gdbarch_float_bit (gdbarch, 4 * TARGET_CHAR_BIT); | |
815 | set_gdbarch_double_bit (gdbarch, 8 * TARGET_CHAR_BIT); | |
816 | set_gdbarch_long_double_bit (gdbarch, 8 * TARGET_CHAR_BIT); | |
817 | ||
0c884e17 CV |
818 | set_gdbarch_ptr_bit (gdbarch, 2 * TARGET_CHAR_BIT); |
819 | set_gdbarch_addr_bit (gdbarch, 4 * TARGET_CHAR_BIT); | |
0c884e17 CV |
820 | |
821 | set_gdbarch_address_to_pointer (gdbarch, xstormy16_address_to_pointer); | |
822 | set_gdbarch_pointer_to_address (gdbarch, xstormy16_pointer_to_address); | |
823 | ||
b6fcb393 | 824 | set_gdbarch_write_pc (gdbarch, generic_target_write_pc); |
0c884e17 | 825 | |
b6fcb393 CV |
826 | /* Stack grows up. */ |
827 | set_gdbarch_inner_than (gdbarch, core_addr_greaterthan); | |
0c884e17 | 828 | |
b6fcb393 CV |
829 | /* |
830 | * Frame Info | |
831 | */ | |
832 | set_gdbarch_unwind_sp (gdbarch, xstormy16_unwind_sp); | |
833 | set_gdbarch_unwind_pc (gdbarch, xstormy16_unwind_pc); | |
834 | set_gdbarch_unwind_dummy_id (gdbarch, xstormy16_unwind_dummy_id); | |
835 | set_gdbarch_frame_align (gdbarch, xstormy16_frame_align); | |
836 | frame_base_set_default (gdbarch, &xstormy16_frame_base); | |
0c884e17 | 837 | |
b6fcb393 CV |
838 | set_gdbarch_skip_prologue (gdbarch, xstormy16_skip_prologue); |
839 | set_gdbarch_in_function_epilogue_p (gdbarch, | |
840 | xstormy16_in_function_epilogue_p); | |
841 | ||
842 | /* These values and methods are used when gdb calls a target function. */ | |
843 | set_gdbarch_push_dummy_call (gdbarch, xstormy16_push_dummy_call); | |
844 | set_gdbarch_breakpoint_from_pc (gdbarch, xstormy16_breakpoint_from_pc); | |
845 | set_gdbarch_return_value (gdbarch, xstormy16_return_value); | |
846 | ||
847 | set_gdbarch_skip_trampoline_code (gdbarch, xstormy16_skip_trampoline_code); | |
0c884e17 CV |
848 | set_gdbarch_in_solib_call_trampoline (gdbarch, |
849 | xstormy16_in_solib_call_trampoline); | |
850 | ||
36482093 AC |
851 | set_gdbarch_print_insn (gdbarch, print_insn_xstormy16); |
852 | ||
b6fcb393 CV |
853 | gdbarch_init_osabi (info, gdbarch); |
854 | ||
855 | frame_unwind_append_sniffer (gdbarch, dwarf2_frame_sniffer); | |
856 | frame_unwind_append_sniffer (gdbarch, xstormy16_frame_sniffer); | |
857 | ||
0c884e17 CV |
858 | return gdbarch; |
859 | } | |
860 | ||
861 | /* Function: _initialize_xstormy16_tdep | |
862 | Initializer function for the Sanyo Xstormy16a module. | |
863 | Called by gdb at start-up. */ | |
864 | ||
a78f21af AC |
865 | extern initialize_file_ftype _initialize_xstormy16_tdep; /* -Wmissing-prototypes */ |
866 | ||
0c884e17 CV |
867 | void |
868 | _initialize_xstormy16_tdep (void) | |
869 | { | |
0c884e17 | 870 | register_gdbarch_init (bfd_arch_xstormy16, xstormy16_gdbarch_init); |
0c884e17 | 871 | } |