Commit | Line | Data |
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0c884e17 | 1 | /* Target-dependent code for the Sanyo Xstormy16a (LC590000) processor. |
f4f9705a | 2 | |
7b6bb8da | 3 | Copyright (C) 2001, 2002, 2003, 2004, 2005, 2007, 2008, 2009, 2010, 2011 |
6aba47ca | 4 | Free Software Foundation, Inc. |
0c884e17 CV |
5 | |
6 | This file is part of GDB. | |
7 | ||
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 | |
a9762ec7 | 10 | the Free Software Foundation; either version 3 of the License, or |
0c884e17 CV |
11 | (at your option) any later version. |
12 | ||
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. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
a9762ec7 | 19 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
0c884e17 CV |
20 | |
21 | #include "defs.h" | |
b6fcb393 CV |
22 | #include "frame.h" |
23 | #include "frame-base.h" | |
24 | #include "frame-unwind.h" | |
25 | #include "dwarf2-frame.h" | |
26 | #include "symtab.h" | |
27 | #include "gdbtypes.h" | |
28 | #include "gdbcmd.h" | |
29 | #include "gdbcore.h" | |
0c884e17 | 30 | #include "value.h" |
b6fcb393 | 31 | #include "dis-asm.h" |
0c884e17 | 32 | #include "inferior.h" |
b6fcb393 CV |
33 | #include "gdb_string.h" |
34 | #include "gdb_assert.h" | |
0c884e17 | 35 | #include "arch-utils.h" |
b6fcb393 | 36 | #include "floatformat.h" |
0c884e17 | 37 | #include "regcache.h" |
b6fcb393 CV |
38 | #include "doublest.h" |
39 | #include "osabi.h" | |
0c884e17 | 40 | #include "objfiles.h" |
0c884e17 CV |
41 | |
42 | enum gdb_regnum | |
43 | { | |
44 | /* Xstormy16 has 16 general purpose registers (R0-R15) plus PC. | |
45 | Functions will return their values in register R2-R7 as they fit. | |
46 | Otherwise a hidden pointer to an big enough area is given as argument | |
581e13c1 | 47 | to the function in r2. Further arguments are beginning in r3 then. |
0c884e17 CV |
48 | R13 is used as frame pointer when GCC compiles w/o optimization |
49 | R14 is used as "PSW", displaying the CPU status. | |
581e13c1 | 50 | R15 is used implicitely as stack pointer. */ |
0c884e17 CV |
51 | E_R0_REGNUM, |
52 | E_R1_REGNUM, | |
53 | E_R2_REGNUM, E_1ST_ARG_REGNUM = E_R2_REGNUM, E_PTR_RET_REGNUM = E_R2_REGNUM, | |
54 | E_R3_REGNUM, | |
55 | E_R4_REGNUM, | |
56 | E_R5_REGNUM, | |
57 | E_R6_REGNUM, | |
58 | E_R7_REGNUM, E_LST_ARG_REGNUM = E_R7_REGNUM, | |
59 | E_R8_REGNUM, | |
60 | E_R9_REGNUM, | |
61 | E_R10_REGNUM, | |
62 | E_R11_REGNUM, | |
63 | E_R12_REGNUM, | |
64 | E_R13_REGNUM, E_FP_REGNUM = E_R13_REGNUM, | |
65 | E_R14_REGNUM, E_PSW_REGNUM = E_R14_REGNUM, | |
66 | E_R15_REGNUM, E_SP_REGNUM = E_R15_REGNUM, | |
67 | E_PC_REGNUM, | |
68 | E_NUM_REGS | |
69 | }; | |
70 | ||
b6fcb393 CV |
71 | /* Use an invalid address value as 'not available' marker. */ |
72 | enum { REG_UNAVAIL = (CORE_ADDR) -1 }; | |
73 | ||
74 | struct xstormy16_frame_cache | |
75 | { | |
76 | /* Base address. */ | |
77 | CORE_ADDR base; | |
78 | CORE_ADDR pc; | |
79 | LONGEST framesize; | |
80 | int uses_fp; | |
81 | CORE_ADDR saved_regs[E_NUM_REGS]; | |
82 | CORE_ADDR saved_sp; | |
83 | }; | |
84 | ||
581e13c1 | 85 | /* Size of instructions, registers, etc. */ |
0c884e17 CV |
86 | enum |
87 | { | |
88 | xstormy16_inst_size = 2, | |
89 | xstormy16_reg_size = 2, | |
90 | xstormy16_pc_size = 4 | |
91 | }; | |
92 | ||
581e13c1 | 93 | /* Size of return datatype which fits into the remaining return registers. */ |
0c884e17 CV |
94 | #define E_MAX_RETTYPE_SIZE(regnum) ((E_LST_ARG_REGNUM - (regnum) + 1) \ |
95 | * xstormy16_reg_size) | |
96 | ||
581e13c1 | 97 | /* Size of return datatype which fits into all return registers. */ |
0c884e17 CV |
98 | enum |
99 | { | |
100 | E_MAX_RETTYPE_SIZE_IN_REGS = E_MAX_RETTYPE_SIZE (E_R2_REGNUM) | |
101 | }; | |
102 | ||
0c884e17 | 103 | /* Function: xstormy16_register_name |
b6fcb393 | 104 | Returns the name of the standard Xstormy16 register N. */ |
0c884e17 | 105 | |
fa88f677 | 106 | static const char * |
d93859e2 | 107 | xstormy16_register_name (struct gdbarch *gdbarch, int regnum) |
0c884e17 CV |
108 | { |
109 | static char *register_names[] = { | |
110 | "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", | |
111 | "r8", "r9", "r10", "r11", "r12", "r13", | |
112 | "psw", "sp", "pc" | |
113 | }; | |
114 | ||
b6fcb393 | 115 | if (regnum < 0 || regnum >= E_NUM_REGS) |
0c884e17 | 116 | internal_error (__FILE__, __LINE__, |
e2e0b3e5 | 117 | _("xstormy16_register_name: illegal register number %d"), |
0c884e17 CV |
118 | regnum); |
119 | else | |
120 | return register_names[regnum]; | |
121 | ||
122 | } | |
123 | ||
0c884e17 | 124 | static struct type * |
b6fcb393 | 125 | xstormy16_register_type (struct gdbarch *gdbarch, int regnum) |
0c884e17 | 126 | { |
b6fcb393 | 127 | if (regnum == E_PC_REGNUM) |
df4df182 | 128 | return builtin_type (gdbarch)->builtin_uint32; |
0c884e17 | 129 | else |
df4df182 | 130 | return builtin_type (gdbarch)->builtin_uint16; |
0c884e17 CV |
131 | } |
132 | ||
0c884e17 CV |
133 | /* Function: xstormy16_type_is_scalar |
134 | Makes the decision if a given type is a scalar types. Scalar | |
b6fcb393 | 135 | types are returned in the registers r2-r7 as they fit. */ |
0c884e17 CV |
136 | |
137 | static int | |
138 | xstormy16_type_is_scalar (struct type *t) | |
139 | { | |
140 | return (TYPE_CODE(t) != TYPE_CODE_STRUCT | |
141 | && TYPE_CODE(t) != TYPE_CODE_UNION | |
142 | && TYPE_CODE(t) != TYPE_CODE_ARRAY); | |
143 | } | |
144 | ||
b6fcb393 CV |
145 | /* Function: xstormy16_use_struct_convention |
146 | Returns non-zero if the given struct type will be returned using | |
147 | a special convention, rather than the normal function return method. | |
148 | 7sed in the contexts of the "return" command, and of | |
149 | target function calls from the debugger. */ | |
150 | ||
151 | static int | |
152 | xstormy16_use_struct_convention (struct type *type) | |
153 | { | |
154 | return !xstormy16_type_is_scalar (type) | |
155 | || TYPE_LENGTH (type) > E_MAX_RETTYPE_SIZE_IN_REGS; | |
156 | } | |
157 | ||
0c884e17 | 158 | /* Function: xstormy16_extract_return_value |
b6fcb393 CV |
159 | Find a function's return value in the appropriate registers (in |
160 | regbuf), and copy it into valbuf. */ | |
0c884e17 CV |
161 | |
162 | static void | |
b6fcb393 CV |
163 | xstormy16_extract_return_value (struct type *type, struct regcache *regcache, |
164 | void *valbuf) | |
0c884e17 | 165 | { |
b6fcb393 CV |
166 | int len = TYPE_LENGTH (type); |
167 | int i, regnum = E_1ST_ARG_REGNUM; | |
0c884e17 | 168 | |
b6fcb393 CV |
169 | for (i = 0; i < len; i += xstormy16_reg_size) |
170 | regcache_raw_read (regcache, regnum++, (char *) valbuf + i); | |
171 | } | |
172 | ||
173 | /* Function: xstormy16_store_return_value | |
174 | Copy the function return value from VALBUF into the | |
175 | proper location for a function return. | |
176 | Called only in the context of the "return" command. */ | |
177 | ||
178 | static void | |
179 | xstormy16_store_return_value (struct type *type, struct regcache *regcache, | |
180 | const void *valbuf) | |
181 | { | |
182 | if (TYPE_LENGTH (type) == 1) | |
183 | { | |
581e13c1 | 184 | /* Add leading zeros to the value. */ |
b6fcb393 CV |
185 | char buf[xstormy16_reg_size]; |
186 | memset (buf, 0, xstormy16_reg_size); | |
187 | memcpy (buf, valbuf, 1); | |
188 | regcache_raw_write (regcache, E_1ST_ARG_REGNUM, buf); | |
0c884e17 CV |
189 | } |
190 | else | |
191 | { | |
b6fcb393 CV |
192 | int len = TYPE_LENGTH (type); |
193 | int i, regnum = E_1ST_ARG_REGNUM; | |
0c884e17 | 194 | |
b6fcb393 CV |
195 | for (i = 0; i < len; i += xstormy16_reg_size) |
196 | regcache_raw_write (regcache, regnum++, (char *) valbuf + i); | |
0c884e17 CV |
197 | } |
198 | } | |
199 | ||
b6fcb393 | 200 | static enum return_value_convention |
c055b101 CV |
201 | xstormy16_return_value (struct gdbarch *gdbarch, struct type *func_type, |
202 | struct type *type, struct regcache *regcache, | |
05c6a9a1 | 203 | gdb_byte *readbuf, const gdb_byte *writebuf) |
b6fcb393 CV |
204 | { |
205 | if (xstormy16_use_struct_convention (type)) | |
206 | return RETURN_VALUE_STRUCT_CONVENTION; | |
207 | if (writebuf) | |
208 | xstormy16_store_return_value (type, regcache, writebuf); | |
209 | else if (readbuf) | |
210 | xstormy16_extract_return_value (type, regcache, readbuf); | |
211 | return RETURN_VALUE_REGISTER_CONVENTION; | |
212 | } | |
213 | ||
214 | static CORE_ADDR | |
215 | xstormy16_frame_align (struct gdbarch *gdbarch, CORE_ADDR addr) | |
216 | { | |
217 | if (addr & 1) | |
218 | ++addr; | |
219 | return addr; | |
220 | } | |
221 | ||
222 | /* Function: xstormy16_push_dummy_call | |
0c884e17 CV |
223 | Setup the function arguments for GDB to call a function in the inferior. |
224 | Called only in the context of a target function call from the debugger. | |
b6fcb393 | 225 | Returns the value of the SP register after the args are pushed. */ |
0c884e17 CV |
226 | |
227 | static CORE_ADDR | |
b6fcb393 CV |
228 | xstormy16_push_dummy_call (struct gdbarch *gdbarch, |
229 | struct value *function, | |
230 | struct regcache *regcache, | |
231 | CORE_ADDR bp_addr, int nargs, | |
232 | struct value **args, | |
233 | CORE_ADDR sp, int struct_return, | |
234 | CORE_ADDR struct_addr) | |
0c884e17 | 235 | { |
e17a4113 | 236 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
0c884e17 CV |
237 | CORE_ADDR stack_dest = sp; |
238 | int argreg = E_1ST_ARG_REGNUM; | |
239 | int i, j; | |
240 | int typelen, slacklen; | |
05c6a9a1 | 241 | const gdb_byte *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 | 251 | |
581e13c1 | 252 | /* Arguments are passed in R2-R7 as they fit. If an argument doesn't |
0c884e17 CV |
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 | { | |
4754a64e | 259 | typelen = TYPE_LENGTH (value_enclosing_type (args[i])); |
0c884e17 CV |
260 | if (typelen > E_MAX_RETTYPE_SIZE (argreg)) |
261 | break; | |
262 | ||
581e13c1 | 263 | /* Put argument into registers wordwise. */ |
0fd88904 | 264 | val = value_contents (args[i]); |
0c884e17 | 265 | for (j = 0; j < typelen; j += xstormy16_reg_size) |
1c6e1b0d PM |
266 | { |
267 | ULONGEST regval; | |
268 | int size = (typelen - j == 1) ? 1 : xstormy16_reg_size; | |
269 | ||
270 | regval = extract_unsigned_integer (val + j, size, byte_order); | |
271 | regcache_cooked_write_unsigned (regcache, argreg++, regval); | |
272 | } | |
0c884e17 CV |
273 | } |
274 | ||
275 | /* Align SP */ | |
b6fcb393 | 276 | stack_dest = xstormy16_frame_align (gdbarch, stack_dest); |
0c884e17 CV |
277 | |
278 | /* Loop backwards through remaining arguments and push them on the stack, | |
b6fcb393 | 279 | wordaligned. */ |
0c884e17 CV |
280 | for (j = nargs - 1; j >= i; j--) |
281 | { | |
05c6a9a1 MS |
282 | char *val; |
283 | ||
4754a64e | 284 | typelen = TYPE_LENGTH (value_enclosing_type (args[j])); |
0c884e17 CV |
285 | slacklen = typelen & 1; |
286 | val = alloca (typelen + slacklen); | |
0fd88904 | 287 | memcpy (val, value_contents (args[j]), typelen); |
0c884e17 CV |
288 | memset (val + typelen, 0, slacklen); |
289 | ||
581e13c1 | 290 | /* Now write this data to the stack. The stack grows upwards. */ |
0c884e17 CV |
291 | write_memory (stack_dest, val, typelen + slacklen); |
292 | stack_dest += typelen + slacklen; | |
293 | } | |
294 | ||
e17a4113 | 295 | store_unsigned_integer (buf, xstormy16_pc_size, byte_order, bp_addr); |
b6fcb393 CV |
296 | write_memory (stack_dest, buf, xstormy16_pc_size); |
297 | stack_dest += xstormy16_pc_size; | |
0c884e17 | 298 | |
b6fcb393 CV |
299 | /* Update stack pointer. */ |
300 | regcache_cooked_write_unsigned (regcache, E_SP_REGNUM, stack_dest); | |
0c884e17 | 301 | |
b6fcb393 CV |
302 | /* Return the new stack pointer minus the return address slot since |
303 | that's what DWARF2/GCC uses as the frame's CFA. */ | |
304 | return stack_dest - xstormy16_pc_size; | |
0c884e17 CV |
305 | } |
306 | ||
307 | /* Function: xstormy16_scan_prologue | |
308 | Decode the instructions within the given address range. | |
309 | Decide when we must have reached the end of the function prologue. | |
310 | If a frame_info pointer is provided, fill in its saved_regs etc. | |
311 | ||
b6fcb393 | 312 | Returns the address of the first instruction after the prologue. */ |
0c884e17 CV |
313 | |
314 | static CORE_ADDR | |
e17a4113 UW |
315 | xstormy16_analyze_prologue (struct gdbarch *gdbarch, |
316 | CORE_ADDR start_addr, CORE_ADDR end_addr, | |
b6fcb393 | 317 | struct xstormy16_frame_cache *cache, |
94afd7a6 | 318 | struct frame_info *this_frame) |
0c884e17 | 319 | { |
e17a4113 | 320 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
0c884e17 CV |
321 | CORE_ADDR next_addr; |
322 | ULONGEST inst, inst2; | |
323 | LONGEST offset; | |
324 | int regnum; | |
325 | ||
581e13c1 | 326 | /* Initialize framesize with size of PC put on stack by CALLF inst. */ |
b6fcb393 CV |
327 | cache->saved_regs[E_PC_REGNUM] = 0; |
328 | cache->framesize = xstormy16_pc_size; | |
329 | ||
330 | if (start_addr >= end_addr) | |
331 | return end_addr; | |
332 | ||
0c884e17 CV |
333 | for (next_addr = start_addr; |
334 | next_addr < end_addr; next_addr += xstormy16_inst_size) | |
335 | { | |
e17a4113 UW |
336 | inst = read_memory_unsigned_integer (next_addr, |
337 | xstormy16_inst_size, byte_order); | |
0c884e17 | 338 | inst2 = read_memory_unsigned_integer (next_addr + xstormy16_inst_size, |
e17a4113 | 339 | xstormy16_inst_size, byte_order); |
0c884e17 CV |
340 | |
341 | if (inst >= 0x0082 && inst <= 0x008d) /* push r2 .. push r13 */ | |
342 | { | |
b6fcb393 CV |
343 | regnum = inst & 0x000f; |
344 | cache->saved_regs[regnum] = cache->framesize; | |
345 | cache->framesize += xstormy16_reg_size; | |
0c884e17 CV |
346 | } |
347 | ||
581e13c1 MS |
348 | /* Optional stack allocation for args and local vars <= 4 byte. */ |
349 | else if (inst == 0x301f || inst == 0x303f) /* inc r15, #0x1/#0x3 */ | |
0c884e17 | 350 | { |
b6fcb393 | 351 | cache->framesize += ((inst & 0x0030) >> 4) + 1; |
0c884e17 CV |
352 | } |
353 | ||
354 | /* optional stack allocation for args and local vars > 4 && < 16 byte */ | |
355 | else if ((inst & 0xff0f) == 0x510f) /* 51Hf add r15, #0xH */ | |
356 | { | |
b6fcb393 | 357 | cache->framesize += (inst & 0x00f0) >> 4; |
0c884e17 CV |
358 | } |
359 | ||
581e13c1 MS |
360 | /* Optional stack allocation for args and local vars >= 16 byte. */ |
361 | else if (inst == 0x314f && inst2 >= 0x0010) /* 314f HHHH add r15, #0xH */ | |
0c884e17 | 362 | { |
b6fcb393 | 363 | cache->framesize += inst2; |
0c884e17 CV |
364 | next_addr += xstormy16_inst_size; |
365 | } | |
366 | ||
367 | else if (inst == 0x46fd) /* mov r13, r15 */ | |
368 | { | |
b6fcb393 | 369 | cache->uses_fp = 1; |
0c884e17 CV |
370 | } |
371 | ||
581e13c1 MS |
372 | /* optional copying of args in r2-r7 to r10-r13. */ |
373 | /* Probably only in optimized case but legal action for prologue. */ | |
0c884e17 CV |
374 | else if ((inst & 0xff00) == 0x4600 /* 46SD mov rD, rS */ |
375 | && (inst & 0x00f0) >= 0x0020 && (inst & 0x00f0) <= 0x0070 | |
376 | && (inst & 0x000f) >= 0x00a0 && (inst & 0x000f) <= 0x000d) | |
377 | ; | |
378 | ||
581e13c1 MS |
379 | /* Optional copying of args in r2-r7 to stack. */ |
380 | /* 72DS HHHH mov.b (rD, 0xHHHH), r(S-8) | |
381 | (bit3 always 1, bit2-0 = reg) */ | |
0c884e17 CV |
382 | /* 73DS HHHH mov.w (rD, 0xHHHH), r(S-8) */ |
383 | else if ((inst & 0xfed8) == 0x72d8 && (inst & 0x0007) >= 2) | |
384 | { | |
b6fcb393 CV |
385 | regnum = inst & 0x0007; |
386 | /* Only 12 of 16 bits of the argument are used for the | |
581e13c1 | 387 | signed offset. */ |
b6fcb393 CV |
388 | offset = (LONGEST) (inst2 & 0x0fff); |
389 | if (offset & 0x0800) | |
390 | offset -= 0x1000; | |
391 | ||
392 | cache->saved_regs[regnum] = cache->framesize + offset; | |
0c884e17 CV |
393 | next_addr += xstormy16_inst_size; |
394 | } | |
0c884e17 | 395 | |
581e13c1 | 396 | else /* Not a prologue instruction. */ |
0c884e17 CV |
397 | break; |
398 | } | |
399 | ||
0c884e17 CV |
400 | return next_addr; |
401 | } | |
402 | ||
403 | /* Function: xstormy16_skip_prologue | |
404 | If the input address is in a function prologue, | |
405 | returns the address of the end of the prologue; | |
406 | else returns the input address. | |
407 | ||
408 | Note: the input address is likely to be the function start, | |
409 | since this function is mainly used for advancing a breakpoint | |
410 | to the first line, or stepping to the first line when we have | |
411 | stepped into a function call. */ | |
412 | ||
413 | static CORE_ADDR | |
6093d2eb | 414 | xstormy16_skip_prologue (struct gdbarch *gdbarch, CORE_ADDR pc) |
0c884e17 CV |
415 | { |
416 | CORE_ADDR func_addr = 0, func_end = 0; | |
417 | char *func_name; | |
418 | ||
419 | if (find_pc_partial_function (pc, &func_name, &func_addr, &func_end)) | |
420 | { | |
421 | struct symtab_and_line sal; | |
422 | struct symbol *sym; | |
b6fcb393 | 423 | struct xstormy16_frame_cache cache; |
57fdbbbe | 424 | CORE_ADDR plg_end; |
0c884e17 | 425 | |
28fe5f6a KB |
426 | memset (&cache, 0, sizeof cache); |
427 | ||
581e13c1 | 428 | /* Don't trust line number debug info in frameless functions. */ |
e17a4113 UW |
429 | plg_end = xstormy16_analyze_prologue (gdbarch, func_addr, func_end, |
430 | &cache, NULL); | |
b6fcb393 | 431 | if (!cache.uses_fp) |
211a4f69 CV |
432 | return plg_end; |
433 | ||
0c884e17 | 434 | /* Found a function. */ |
2570f2b7 | 435 | sym = lookup_symbol (func_name, NULL, VAR_DOMAIN, NULL); |
581e13c1 | 436 | /* Don't use line number debug info for assembly source files. */ |
0c884e17 CV |
437 | if (sym && SYMBOL_LANGUAGE (sym) != language_asm) |
438 | { | |
0c884e17 CV |
439 | sal = find_pc_line (func_addr, 0); |
440 | if (sal.end && sal.end < func_end) | |
441 | { | |
442 | /* Found a line number, use it as end of prologue. */ | |
443 | return sal.end; | |
444 | } | |
445 | } | |
581e13c1 | 446 | /* No useable line symbol. Use result of prologue parsing method. */ |
211a4f69 | 447 | return plg_end; |
0c884e17 CV |
448 | } |
449 | ||
581e13c1 | 450 | /* No function symbol -- just return the PC. */ |
0c884e17 CV |
451 | |
452 | return (CORE_ADDR) pc; | |
453 | } | |
454 | ||
455 | /* The epilogue is defined here as the area at the end of a function, | |
456 | either on the `ret' instruction itself or after an instruction which | |
581e13c1 | 457 | destroys the function's stack frame. */ |
0c884e17 CV |
458 | static int |
459 | xstormy16_in_function_epilogue_p (struct gdbarch *gdbarch, CORE_ADDR pc) | |
460 | { | |
e17a4113 | 461 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
b6fcb393 | 462 | CORE_ADDR func_addr = 0, func_end = 0; |
0c884e17 CV |
463 | |
464 | if (find_pc_partial_function (pc, NULL, &func_addr, &func_end)) | |
465 | { | |
466 | ULONGEST inst, inst2; | |
467 | CORE_ADDR addr = func_end - xstormy16_inst_size; | |
468 | ||
581e13c1 | 469 | /* The Xstormy16 epilogue is max. 14 bytes long. */ |
0c884e17 CV |
470 | if (pc < func_end - 7 * xstormy16_inst_size) |
471 | return 0; | |
472 | ||
473 | /* Check if we're on a `ret' instruction. Otherwise it's | |
581e13c1 | 474 | too dangerous to proceed. */ |
e17a4113 UW |
475 | inst = read_memory_unsigned_integer (addr, |
476 | xstormy16_inst_size, byte_order); | |
0c884e17 CV |
477 | if (inst != 0x0003) |
478 | return 0; | |
479 | ||
480 | while ((addr -= xstormy16_inst_size) >= func_addr) | |
481 | { | |
e17a4113 | 482 | inst = read_memory_unsigned_integer (addr, |
581e13c1 MS |
483 | xstormy16_inst_size, |
484 | byte_order); | |
0c884e17 CV |
485 | if (inst >= 0x009a && inst <= 0x009d) /* pop r10...r13 */ |
486 | continue; | |
487 | if (inst == 0x305f || inst == 0x307f) /* dec r15, #0x1/#0x3 */ | |
488 | break; | |
489 | inst2 = read_memory_unsigned_integer (addr - xstormy16_inst_size, | |
581e13c1 MS |
490 | xstormy16_inst_size, |
491 | byte_order); | |
492 | if (inst2 == 0x314f && inst >= 0x8000) /* add r15, neg. value */ | |
0c884e17 CV |
493 | { |
494 | addr -= xstormy16_inst_size; | |
495 | break; | |
496 | } | |
497 | return 0; | |
498 | } | |
499 | if (pc > addr) | |
500 | return 1; | |
501 | } | |
502 | return 0; | |
503 | } | |
504 | ||
f4f9705a | 505 | const static unsigned char * |
67d57894 MD |
506 | xstormy16_breakpoint_from_pc (struct gdbarch *gdbarch, CORE_ADDR *pcptr, |
507 | int *lenptr) | |
0c884e17 CV |
508 | { |
509 | static unsigned char breakpoint[] = { 0x06, 0x0 }; | |
510 | *lenptr = sizeof (breakpoint); | |
511 | return breakpoint; | |
512 | } | |
513 | ||
514 | /* Given a pointer to a jump table entry, return the address | |
581e13c1 | 515 | of the function it jumps to. Return 0 if not found. */ |
0c884e17 | 516 | static CORE_ADDR |
e17a4113 | 517 | xstormy16_resolve_jmp_table_entry (struct gdbarch *gdbarch, CORE_ADDR faddr) |
0c884e17 | 518 | { |
e17a4113 | 519 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
0c884e17 CV |
520 | struct obj_section *faddr_sect = find_pc_section (faddr); |
521 | ||
522 | if (faddr_sect) | |
523 | { | |
524 | LONGEST inst, inst2, addr; | |
525 | char buf[2 * xstormy16_inst_size]; | |
526 | ||
581e13c1 | 527 | /* Return faddr if it's not pointing into the jump table. */ |
0c884e17 CV |
528 | if (strcmp (faddr_sect->the_bfd_section->name, ".plt")) |
529 | return faddr; | |
530 | ||
531 | if (!target_read_memory (faddr, buf, sizeof buf)) | |
532 | { | |
e17a4113 UW |
533 | inst = extract_unsigned_integer (buf, |
534 | xstormy16_inst_size, byte_order); | |
0c884e17 | 535 | inst2 = extract_unsigned_integer (buf + xstormy16_inst_size, |
e17a4113 | 536 | xstormy16_inst_size, byte_order); |
0c884e17 CV |
537 | addr = inst2 << 8 | (inst & 0xff); |
538 | return addr; | |
539 | } | |
540 | } | |
541 | return 0; | |
542 | } | |
543 | ||
544 | /* Given a function's address, attempt to find (and return) the | |
545 | address of the corresponding jump table entry. Return 0 if | |
581e13c1 | 546 | not found. */ |
0c884e17 | 547 | static CORE_ADDR |
e17a4113 | 548 | xstormy16_find_jmp_table_entry (struct gdbarch *gdbarch, CORE_ADDR faddr) |
0c884e17 | 549 | { |
e17a4113 | 550 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
0c884e17 CV |
551 | struct obj_section *faddr_sect = find_pc_section (faddr); |
552 | ||
553 | if (faddr_sect) | |
554 | { | |
555 | struct obj_section *osect; | |
556 | ||
581e13c1 | 557 | /* Return faddr if it's already a pointer to a jump table entry. */ |
0c884e17 CV |
558 | if (!strcmp (faddr_sect->the_bfd_section->name, ".plt")) |
559 | return faddr; | |
560 | ||
561 | ALL_OBJFILE_OSECTIONS (faddr_sect->objfile, osect) | |
562 | { | |
563 | if (!strcmp (osect->the_bfd_section->name, ".plt")) | |
564 | break; | |
565 | } | |
566 | ||
567 | if (osect < faddr_sect->objfile->sections_end) | |
568 | { | |
aded6f54 PA |
569 | CORE_ADDR addr, endaddr; |
570 | ||
571 | addr = obj_section_addr (osect); | |
572 | endaddr = obj_section_endaddr (osect); | |
573 | ||
574 | for (; addr < endaddr; addr += 2 * xstormy16_inst_size) | |
0c884e17 | 575 | { |
0c884e17 CV |
576 | LONGEST inst, inst2, faddr2; |
577 | char buf[2 * xstormy16_inst_size]; | |
578 | ||
579 | if (target_read_memory (addr, buf, sizeof buf)) | |
580 | return 0; | |
e17a4113 | 581 | inst = extract_unsigned_integer (buf, |
581e13c1 MS |
582 | xstormy16_inst_size, |
583 | byte_order); | |
0c884e17 | 584 | inst2 = extract_unsigned_integer (buf + xstormy16_inst_size, |
581e13c1 MS |
585 | xstormy16_inst_size, |
586 | byte_order); | |
0c884e17 CV |
587 | faddr2 = inst2 << 8 | (inst & 0xff); |
588 | if (faddr == faddr2) | |
589 | return addr; | |
590 | } | |
591 | } | |
592 | } | |
593 | return 0; | |
594 | } | |
595 | ||
596 | static CORE_ADDR | |
52f729a7 | 597 | xstormy16_skip_trampoline_code (struct frame_info *frame, CORE_ADDR pc) |
0c884e17 | 598 | { |
e17a4113 UW |
599 | struct gdbarch *gdbarch = get_frame_arch (frame); |
600 | CORE_ADDR tmp = xstormy16_resolve_jmp_table_entry (gdbarch, pc); | |
0c884e17 CV |
601 | |
602 | if (tmp && tmp != pc) | |
603 | return tmp; | |
604 | return 0; | |
605 | } | |
606 | ||
b6fcb393 CV |
607 | /* Function pointers are 16 bit. The address space is 24 bit, using |
608 | 32 bit addresses. Pointers to functions on the XStormy16 are implemented | |
609 | by using 16 bit pointers, which are either direct pointers in case the | |
610 | function begins below 0x10000, or indirect pointers into a jump table. | |
611 | The next two functions convert 16 bit pointers into 24 (32) bit addresses | |
612 | and vice versa. */ | |
613 | ||
0c884e17 | 614 | static CORE_ADDR |
9898f801 UW |
615 | xstormy16_pointer_to_address (struct gdbarch *gdbarch, |
616 | struct type *type, const gdb_byte *buf) | |
0c884e17 | 617 | { |
e17a4113 | 618 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
0c884e17 | 619 | enum type_code target = TYPE_CODE (TYPE_TARGET_TYPE (type)); |
e17a4113 UW |
620 | CORE_ADDR addr |
621 | = extract_unsigned_integer (buf, TYPE_LENGTH (type), byte_order); | |
0c884e17 CV |
622 | |
623 | if (target == TYPE_CODE_FUNC || target == TYPE_CODE_METHOD) | |
624 | { | |
e17a4113 | 625 | CORE_ADDR addr2 = xstormy16_resolve_jmp_table_entry (gdbarch, addr); |
0c884e17 CV |
626 | if (addr2) |
627 | addr = addr2; | |
628 | } | |
629 | ||
630 | return addr; | |
631 | } | |
632 | ||
633 | static void | |
9898f801 UW |
634 | xstormy16_address_to_pointer (struct gdbarch *gdbarch, |
635 | struct type *type, gdb_byte *buf, CORE_ADDR addr) | |
0c884e17 | 636 | { |
e17a4113 | 637 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
0c884e17 CV |
638 | enum type_code target = TYPE_CODE (TYPE_TARGET_TYPE (type)); |
639 | ||
640 | if (target == TYPE_CODE_FUNC || target == TYPE_CODE_METHOD) | |
641 | { | |
e17a4113 | 642 | CORE_ADDR addr2 = xstormy16_find_jmp_table_entry (gdbarch, addr); |
0c884e17 CV |
643 | if (addr2) |
644 | addr = addr2; | |
645 | } | |
e17a4113 | 646 | store_unsigned_integer (buf, TYPE_LENGTH (type), byte_order, addr); |
0c884e17 CV |
647 | } |
648 | ||
b6fcb393 CV |
649 | static struct xstormy16_frame_cache * |
650 | xstormy16_alloc_frame_cache (void) | |
0c884e17 | 651 | { |
b6fcb393 CV |
652 | struct xstormy16_frame_cache *cache; |
653 | int i; | |
654 | ||
655 | cache = FRAME_OBSTACK_ZALLOC (struct xstormy16_frame_cache); | |
656 | ||
657 | cache->base = 0; | |
658 | cache->saved_sp = 0; | |
659 | cache->pc = 0; | |
660 | cache->uses_fp = 0; | |
661 | cache->framesize = 0; | |
662 | for (i = 0; i < E_NUM_REGS; ++i) | |
663 | cache->saved_regs[i] = REG_UNAVAIL; | |
664 | ||
665 | return cache; | |
666 | } | |
667 | ||
668 | static struct xstormy16_frame_cache * | |
94afd7a6 | 669 | xstormy16_frame_cache (struct frame_info *this_frame, void **this_cache) |
b6fcb393 | 670 | { |
e17a4113 | 671 | struct gdbarch *gdbarch = get_frame_arch (this_frame); |
b6fcb393 CV |
672 | struct xstormy16_frame_cache *cache; |
673 | CORE_ADDR current_pc; | |
674 | int i; | |
675 | ||
676 | if (*this_cache) | |
677 | return *this_cache; | |
678 | ||
679 | cache = xstormy16_alloc_frame_cache (); | |
680 | *this_cache = cache; | |
681 | ||
94afd7a6 | 682 | cache->base = get_frame_register_unsigned (this_frame, E_FP_REGNUM); |
b6fcb393 CV |
683 | if (cache->base == 0) |
684 | return cache; | |
685 | ||
94afd7a6 UW |
686 | cache->pc = get_frame_func (this_frame); |
687 | current_pc = get_frame_pc (this_frame); | |
b6fcb393 | 688 | if (cache->pc) |
e17a4113 UW |
689 | xstormy16_analyze_prologue (gdbarch, cache->pc, current_pc, |
690 | cache, this_frame); | |
b6fcb393 CV |
691 | |
692 | if (!cache->uses_fp) | |
94afd7a6 | 693 | cache->base = get_frame_register_unsigned (this_frame, E_SP_REGNUM); |
b6fcb393 CV |
694 | |
695 | cache->saved_sp = cache->base - cache->framesize; | |
696 | ||
697 | for (i = 0; i < E_NUM_REGS; ++i) | |
698 | if (cache->saved_regs[i] != REG_UNAVAIL) | |
699 | cache->saved_regs[i] += cache->saved_sp; | |
700 | ||
701 | return cache; | |
0c884e17 CV |
702 | } |
703 | ||
94afd7a6 UW |
704 | static struct value * |
705 | xstormy16_frame_prev_register (struct frame_info *this_frame, | |
706 | void **this_cache, int regnum) | |
b6fcb393 | 707 | { |
94afd7a6 | 708 | struct xstormy16_frame_cache *cache = xstormy16_frame_cache (this_frame, |
b6fcb393 CV |
709 | this_cache); |
710 | gdb_assert (regnum >= 0); | |
711 | ||
712 | if (regnum == E_SP_REGNUM && cache->saved_sp) | |
94afd7a6 | 713 | return frame_unwind_got_constant (this_frame, regnum, cache->saved_sp); |
b6fcb393 CV |
714 | |
715 | if (regnum < E_NUM_REGS && cache->saved_regs[regnum] != REG_UNAVAIL) | |
94afd7a6 UW |
716 | return frame_unwind_got_memory (this_frame, regnum, |
717 | cache->saved_regs[regnum]); | |
b6fcb393 | 718 | |
94afd7a6 | 719 | return frame_unwind_got_register (this_frame, regnum, regnum); |
b6fcb393 CV |
720 | } |
721 | ||
722 | static void | |
94afd7a6 | 723 | xstormy16_frame_this_id (struct frame_info *this_frame, void **this_cache, |
b6fcb393 CV |
724 | struct frame_id *this_id) |
725 | { | |
94afd7a6 | 726 | struct xstormy16_frame_cache *cache = xstormy16_frame_cache (this_frame, |
b6fcb393 CV |
727 | this_cache); |
728 | ||
729 | /* This marks the outermost frame. */ | |
730 | if (cache->base == 0) | |
731 | return; | |
732 | ||
733 | *this_id = frame_id_build (cache->saved_sp, cache->pc); | |
734 | } | |
735 | ||
736 | static CORE_ADDR | |
94afd7a6 | 737 | xstormy16_frame_base_address (struct frame_info *this_frame, void **this_cache) |
b6fcb393 | 738 | { |
94afd7a6 | 739 | struct xstormy16_frame_cache *cache = xstormy16_frame_cache (this_frame, |
b6fcb393 CV |
740 | this_cache); |
741 | return cache->base; | |
742 | } | |
743 | ||
744 | static const struct frame_unwind xstormy16_frame_unwind = { | |
745 | NORMAL_FRAME, | |
8fbca658 | 746 | default_frame_unwind_stop_reason, |
b6fcb393 | 747 | xstormy16_frame_this_id, |
94afd7a6 UW |
748 | xstormy16_frame_prev_register, |
749 | NULL, | |
750 | default_frame_sniffer | |
b6fcb393 CV |
751 | }; |
752 | ||
753 | static const struct frame_base xstormy16_frame_base = { | |
754 | &xstormy16_frame_unwind, | |
755 | xstormy16_frame_base_address, | |
756 | xstormy16_frame_base_address, | |
757 | xstormy16_frame_base_address | |
758 | }; | |
759 | ||
b6fcb393 CV |
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 | 772 | static struct frame_id |
94afd7a6 | 773 | xstormy16_dummy_id (struct gdbarch *gdbarch, struct frame_info *this_frame) |
b6fcb393 | 774 | { |
94afd7a6 UW |
775 | CORE_ADDR sp = get_frame_register_unsigned (this_frame, E_SP_REGNUM); |
776 | return frame_id_build (sp, get_frame_pc (this_frame)); | |
b6fcb393 CV |
777 | } |
778 | ||
779 | ||
0c884e17 CV |
780 | /* Function: xstormy16_gdbarch_init |
781 | Initializer function for the xstormy16 gdbarch vector. | |
581e13c1 | 782 | Called by gdbarch. Sets up the gdbarch vector(s) for this target. */ |
0c884e17 CV |
783 | |
784 | static struct gdbarch * | |
785 | xstormy16_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches) | |
786 | { | |
0c884e17 CV |
787 | struct gdbarch *gdbarch; |
788 | ||
581e13c1 | 789 | /* find a candidate among the list of pre-declared architectures. */ |
0c884e17 CV |
790 | arches = gdbarch_list_lookup_by_info (arches, &info); |
791 | if (arches != NULL) | |
792 | return (arches->gdbarch); | |
793 | ||
b6fcb393 | 794 | gdbarch = gdbarch_alloc (&info, NULL); |
a5afb99f | 795 | |
0c884e17 | 796 | /* |
b6fcb393 | 797 | * Basic register fields and methods, datatype sizes and stuff. |
0c884e17 CV |
798 | */ |
799 | ||
800 | set_gdbarch_num_regs (gdbarch, E_NUM_REGS); | |
801 | set_gdbarch_num_pseudo_regs (gdbarch, 0); | |
802 | set_gdbarch_sp_regnum (gdbarch, E_SP_REGNUM); | |
0c884e17 CV |
803 | set_gdbarch_pc_regnum (gdbarch, E_PC_REGNUM); |
804 | set_gdbarch_register_name (gdbarch, xstormy16_register_name); | |
b6fcb393 | 805 | set_gdbarch_register_type (gdbarch, xstormy16_register_type); |
0c884e17 | 806 | |
71c08af0 | 807 | set_gdbarch_char_signed (gdbarch, 0); |
b6fcb393 | 808 | set_gdbarch_short_bit (gdbarch, 2 * TARGET_CHAR_BIT); |
0c884e17 | 809 | set_gdbarch_int_bit (gdbarch, 2 * TARGET_CHAR_BIT); |
b6fcb393 CV |
810 | set_gdbarch_long_bit (gdbarch, 4 * TARGET_CHAR_BIT); |
811 | set_gdbarch_long_long_bit (gdbarch, 8 * TARGET_CHAR_BIT); | |
812 | ||
813 | set_gdbarch_float_bit (gdbarch, 4 * TARGET_CHAR_BIT); | |
814 | set_gdbarch_double_bit (gdbarch, 8 * TARGET_CHAR_BIT); | |
815 | set_gdbarch_long_double_bit (gdbarch, 8 * TARGET_CHAR_BIT); | |
816 | ||
0c884e17 CV |
817 | set_gdbarch_ptr_bit (gdbarch, 2 * TARGET_CHAR_BIT); |
818 | set_gdbarch_addr_bit (gdbarch, 4 * TARGET_CHAR_BIT); | |
8da614df | 819 | set_gdbarch_dwarf2_addr_size (gdbarch, 4); |
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 | ||
581e13c1 | 824 | /* Stack grows up. */ |
b6fcb393 | 825 | set_gdbarch_inner_than (gdbarch, core_addr_greaterthan); |
0c884e17 | 826 | |
b6fcb393 CV |
827 | /* |
828 | * Frame Info | |
829 | */ | |
830 | set_gdbarch_unwind_sp (gdbarch, xstormy16_unwind_sp); | |
831 | set_gdbarch_unwind_pc (gdbarch, xstormy16_unwind_pc); | |
94afd7a6 | 832 | set_gdbarch_dummy_id (gdbarch, xstormy16_dummy_id); |
b6fcb393 CV |
833 | set_gdbarch_frame_align (gdbarch, xstormy16_frame_align); |
834 | frame_base_set_default (gdbarch, &xstormy16_frame_base); | |
0c884e17 | 835 | |
b6fcb393 CV |
836 | set_gdbarch_skip_prologue (gdbarch, xstormy16_skip_prologue); |
837 | set_gdbarch_in_function_epilogue_p (gdbarch, | |
838 | xstormy16_in_function_epilogue_p); | |
839 | ||
840 | /* These values and methods are used when gdb calls a target function. */ | |
841 | set_gdbarch_push_dummy_call (gdbarch, xstormy16_push_dummy_call); | |
842 | set_gdbarch_breakpoint_from_pc (gdbarch, xstormy16_breakpoint_from_pc); | |
843 | set_gdbarch_return_value (gdbarch, xstormy16_return_value); | |
844 | ||
845 | set_gdbarch_skip_trampoline_code (gdbarch, xstormy16_skip_trampoline_code); | |
0c884e17 | 846 | |
36482093 AC |
847 | set_gdbarch_print_insn (gdbarch, print_insn_xstormy16); |
848 | ||
b6fcb393 CV |
849 | gdbarch_init_osabi (info, gdbarch); |
850 | ||
94afd7a6 UW |
851 | dwarf2_append_unwinders (gdbarch); |
852 | frame_unwind_append_unwinder (gdbarch, &xstormy16_frame_unwind); | |
b6fcb393 | 853 | |
0c884e17 CV |
854 | return gdbarch; |
855 | } | |
856 | ||
857 | /* Function: _initialize_xstormy16_tdep | |
858 | Initializer function for the Sanyo Xstormy16a module. | |
581e13c1 | 859 | Called by gdb at start-up. */ |
0c884e17 | 860 | |
581e13c1 MS |
861 | /* -Wmissing-prototypes */ |
862 | extern initialize_file_ftype _initialize_xstormy16_tdep; | |
a78f21af | 863 | |
0c884e17 CV |
864 | void |
865 | _initialize_xstormy16_tdep (void) | |
866 | { | |
0c884e17 | 867 | register_gdbarch_init (bfd_arch_xstormy16, xstormy16_gdbarch_init); |
0c884e17 | 868 | } |