Commit | Line | Data |
---|---|---|
0c884e17 | 1 | /* Target-dependent code for the Sanyo Xstormy16a (LC590000) processor. |
f4f9705a | 2 | |
e2882c85 | 3 | Copyright (C) 2001-2018 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 | |
a9762ec7 | 9 | the Free Software Foundation; either version 3 of the License, or |
0c884e17 CV |
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 | |
a9762ec7 | 18 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
0c884e17 CV |
19 | |
20 | #include "defs.h" | |
b6fcb393 CV |
21 | #include "frame.h" |
22 | #include "frame-base.h" | |
23 | #include "frame-unwind.h" | |
24 | #include "dwarf2-frame.h" | |
25 | #include "symtab.h" | |
26 | #include "gdbtypes.h" | |
27 | #include "gdbcmd.h" | |
28 | #include "gdbcore.h" | |
0c884e17 | 29 | #include "value.h" |
b6fcb393 | 30 | #include "dis-asm.h" |
0c884e17 | 31 | #include "inferior.h" |
0c884e17 CV |
32 | #include "arch-utils.h" |
33 | #include "regcache.h" | |
b6fcb393 | 34 | #include "osabi.h" |
0c884e17 | 35 | #include "objfiles.h" |
726b2169 | 36 | #include "common/byte-vector.h" |
0c884e17 CV |
37 | |
38 | enum gdb_regnum | |
39 | { | |
40 | /* Xstormy16 has 16 general purpose registers (R0-R15) plus PC. | |
41 | Functions will return their values in register R2-R7 as they fit. | |
42 | Otherwise a hidden pointer to an big enough area is given as argument | |
581e13c1 | 43 | to the function in r2. Further arguments are beginning in r3 then. |
0c884e17 CV |
44 | R13 is used as frame pointer when GCC compiles w/o optimization |
45 | R14 is used as "PSW", displaying the CPU status. | |
581e13c1 | 46 | R15 is used implicitely as stack pointer. */ |
0c884e17 CV |
47 | E_R0_REGNUM, |
48 | E_R1_REGNUM, | |
49 | E_R2_REGNUM, E_1ST_ARG_REGNUM = E_R2_REGNUM, E_PTR_RET_REGNUM = E_R2_REGNUM, | |
50 | E_R3_REGNUM, | |
51 | E_R4_REGNUM, | |
52 | E_R5_REGNUM, | |
53 | E_R6_REGNUM, | |
54 | E_R7_REGNUM, E_LST_ARG_REGNUM = E_R7_REGNUM, | |
55 | E_R8_REGNUM, | |
56 | E_R9_REGNUM, | |
57 | E_R10_REGNUM, | |
58 | E_R11_REGNUM, | |
59 | E_R12_REGNUM, | |
60 | E_R13_REGNUM, E_FP_REGNUM = E_R13_REGNUM, | |
61 | E_R14_REGNUM, E_PSW_REGNUM = E_R14_REGNUM, | |
62 | E_R15_REGNUM, E_SP_REGNUM = E_R15_REGNUM, | |
63 | E_PC_REGNUM, | |
64 | E_NUM_REGS | |
65 | }; | |
66 | ||
b6fcb393 CV |
67 | /* Use an invalid address value as 'not available' marker. */ |
68 | enum { REG_UNAVAIL = (CORE_ADDR) -1 }; | |
69 | ||
70 | struct xstormy16_frame_cache | |
71 | { | |
72 | /* Base address. */ | |
73 | CORE_ADDR base; | |
74 | CORE_ADDR pc; | |
75 | LONGEST framesize; | |
76 | int uses_fp; | |
77 | CORE_ADDR saved_regs[E_NUM_REGS]; | |
78 | CORE_ADDR saved_sp; | |
79 | }; | |
80 | ||
581e13c1 | 81 | /* Size of instructions, registers, etc. */ |
0c884e17 CV |
82 | enum |
83 | { | |
84 | xstormy16_inst_size = 2, | |
85 | xstormy16_reg_size = 2, | |
86 | xstormy16_pc_size = 4 | |
87 | }; | |
88 | ||
581e13c1 | 89 | /* Size of return datatype which fits into the remaining return registers. */ |
0c884e17 CV |
90 | #define E_MAX_RETTYPE_SIZE(regnum) ((E_LST_ARG_REGNUM - (regnum) + 1) \ |
91 | * xstormy16_reg_size) | |
92 | ||
581e13c1 | 93 | /* Size of return datatype which fits into all return registers. */ |
0c884e17 CV |
94 | enum |
95 | { | |
96 | E_MAX_RETTYPE_SIZE_IN_REGS = E_MAX_RETTYPE_SIZE (E_R2_REGNUM) | |
97 | }; | |
98 | ||
0c884e17 | 99 | /* Function: xstormy16_register_name |
b6fcb393 | 100 | Returns the name of the standard Xstormy16 register N. */ |
0c884e17 | 101 | |
fa88f677 | 102 | static const char * |
d93859e2 | 103 | xstormy16_register_name (struct gdbarch *gdbarch, int regnum) |
0c884e17 | 104 | { |
a121b7c1 | 105 | static const char *register_names[] = { |
0c884e17 CV |
106 | "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", |
107 | "r8", "r9", "r10", "r11", "r12", "r13", | |
108 | "psw", "sp", "pc" | |
109 | }; | |
110 | ||
b6fcb393 | 111 | if (regnum < 0 || regnum >= E_NUM_REGS) |
0c884e17 | 112 | internal_error (__FILE__, __LINE__, |
e2e0b3e5 | 113 | _("xstormy16_register_name: illegal register number %d"), |
0c884e17 CV |
114 | regnum); |
115 | else | |
116 | return register_names[regnum]; | |
117 | ||
118 | } | |
119 | ||
0c884e17 | 120 | static struct type * |
b6fcb393 | 121 | xstormy16_register_type (struct gdbarch *gdbarch, int regnum) |
0c884e17 | 122 | { |
b6fcb393 | 123 | if (regnum == E_PC_REGNUM) |
df4df182 | 124 | return builtin_type (gdbarch)->builtin_uint32; |
0c884e17 | 125 | else |
df4df182 | 126 | return builtin_type (gdbarch)->builtin_uint16; |
0c884e17 CV |
127 | } |
128 | ||
0c884e17 CV |
129 | /* Function: xstormy16_type_is_scalar |
130 | Makes the decision if a given type is a scalar types. Scalar | |
b6fcb393 | 131 | types are returned in the registers r2-r7 as they fit. */ |
0c884e17 CV |
132 | |
133 | static int | |
134 | xstormy16_type_is_scalar (struct type *t) | |
135 | { | |
136 | return (TYPE_CODE(t) != TYPE_CODE_STRUCT | |
137 | && TYPE_CODE(t) != TYPE_CODE_UNION | |
138 | && TYPE_CODE(t) != TYPE_CODE_ARRAY); | |
139 | } | |
140 | ||
b6fcb393 CV |
141 | /* Function: xstormy16_use_struct_convention |
142 | Returns non-zero if the given struct type will be returned using | |
143 | a special convention, rather than the normal function return method. | |
144 | 7sed in the contexts of the "return" command, and of | |
145 | target function calls from the debugger. */ | |
146 | ||
147 | static int | |
148 | xstormy16_use_struct_convention (struct type *type) | |
149 | { | |
150 | return !xstormy16_type_is_scalar (type) | |
151 | || TYPE_LENGTH (type) > E_MAX_RETTYPE_SIZE_IN_REGS; | |
152 | } | |
153 | ||
0c884e17 | 154 | /* Function: xstormy16_extract_return_value |
b6fcb393 CV |
155 | Find a function's return value in the appropriate registers (in |
156 | regbuf), and copy it into valbuf. */ | |
0c884e17 CV |
157 | |
158 | static void | |
b6fcb393 | 159 | xstormy16_extract_return_value (struct type *type, struct regcache *regcache, |
948f8e3d | 160 | gdb_byte *valbuf) |
0c884e17 | 161 | { |
b6fcb393 CV |
162 | int len = TYPE_LENGTH (type); |
163 | int i, regnum = E_1ST_ARG_REGNUM; | |
0c884e17 | 164 | |
b6fcb393 | 165 | for (i = 0; i < len; i += xstormy16_reg_size) |
0b883586 | 166 | regcache->raw_read (regnum++, valbuf + i); |
b6fcb393 CV |
167 | } |
168 | ||
169 | /* Function: xstormy16_store_return_value | |
170 | Copy the function return value from VALBUF into the | |
171 | proper location for a function return. | |
172 | Called only in the context of the "return" command. */ | |
173 | ||
174 | static void | |
175 | xstormy16_store_return_value (struct type *type, struct regcache *regcache, | |
948f8e3d | 176 | const gdb_byte *valbuf) |
b6fcb393 CV |
177 | { |
178 | if (TYPE_LENGTH (type) == 1) | |
179 | { | |
581e13c1 | 180 | /* Add leading zeros to the value. */ |
e362b510 | 181 | gdb_byte buf[xstormy16_reg_size]; |
b6fcb393 CV |
182 | memset (buf, 0, xstormy16_reg_size); |
183 | memcpy (buf, valbuf, 1); | |
10eaee5f | 184 | regcache->raw_write (E_1ST_ARG_REGNUM, buf); |
0c884e17 CV |
185 | } |
186 | else | |
187 | { | |
b6fcb393 CV |
188 | int len = TYPE_LENGTH (type); |
189 | int i, regnum = E_1ST_ARG_REGNUM; | |
0c884e17 | 190 | |
b6fcb393 | 191 | for (i = 0; i < len; i += xstormy16_reg_size) |
10eaee5f | 192 | regcache->raw_write (regnum++, valbuf + i); |
0c884e17 CV |
193 | } |
194 | } | |
195 | ||
b6fcb393 | 196 | static enum return_value_convention |
6a3a010b | 197 | xstormy16_return_value (struct gdbarch *gdbarch, struct value *function, |
c055b101 | 198 | struct type *type, struct regcache *regcache, |
05c6a9a1 | 199 | gdb_byte *readbuf, const gdb_byte *writebuf) |
b6fcb393 CV |
200 | { |
201 | if (xstormy16_use_struct_convention (type)) | |
202 | return RETURN_VALUE_STRUCT_CONVENTION; | |
203 | if (writebuf) | |
204 | xstormy16_store_return_value (type, regcache, writebuf); | |
205 | else if (readbuf) | |
206 | xstormy16_extract_return_value (type, regcache, readbuf); | |
207 | return RETURN_VALUE_REGISTER_CONVENTION; | |
208 | } | |
209 | ||
210 | static CORE_ADDR | |
211 | xstormy16_frame_align (struct gdbarch *gdbarch, CORE_ADDR addr) | |
212 | { | |
213 | if (addr & 1) | |
214 | ++addr; | |
215 | return addr; | |
216 | } | |
217 | ||
218 | /* Function: xstormy16_push_dummy_call | |
0c884e17 CV |
219 | Setup the function arguments for GDB to call a function in the inferior. |
220 | Called only in the context of a target function call from the debugger. | |
b6fcb393 | 221 | Returns the value of the SP register after the args are pushed. */ |
0c884e17 CV |
222 | |
223 | static CORE_ADDR | |
b6fcb393 CV |
224 | xstormy16_push_dummy_call (struct gdbarch *gdbarch, |
225 | struct value *function, | |
226 | struct regcache *regcache, | |
227 | CORE_ADDR bp_addr, int nargs, | |
228 | struct value **args, | |
229 | CORE_ADDR sp, int struct_return, | |
230 | CORE_ADDR struct_addr) | |
0c884e17 | 231 | { |
e17a4113 | 232 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
0c884e17 CV |
233 | CORE_ADDR stack_dest = sp; |
234 | int argreg = E_1ST_ARG_REGNUM; | |
235 | int i, j; | |
236 | int typelen, slacklen; | |
e362b510 | 237 | gdb_byte buf[xstormy16_pc_size]; |
0c884e17 CV |
238 | |
239 | /* If struct_return is true, then the struct return address will | |
240 | consume one argument-passing register. */ | |
241 | if (struct_return) | |
b6fcb393 CV |
242 | { |
243 | regcache_cooked_write_unsigned (regcache, E_PTR_RET_REGNUM, struct_addr); | |
244 | argreg++; | |
245 | } | |
0c884e17 | 246 | |
581e13c1 | 247 | /* Arguments are passed in R2-R7 as they fit. If an argument doesn't |
0c884e17 CV |
248 | fit in the remaining registers we're switching over to the stack. |
249 | No argument is put on stack partially and as soon as we switched | |
250 | over to stack no further argument is put in a register even if it | |
b6fcb393 | 251 | would fit in the remaining unused registers. */ |
0c884e17 CV |
252 | for (i = 0; i < nargs && argreg <= E_LST_ARG_REGNUM; i++) |
253 | { | |
4754a64e | 254 | typelen = TYPE_LENGTH (value_enclosing_type (args[i])); |
0c884e17 CV |
255 | if (typelen > E_MAX_RETTYPE_SIZE (argreg)) |
256 | break; | |
257 | ||
581e13c1 | 258 | /* Put argument into registers wordwise. */ |
b926417a | 259 | const gdb_byte *val = value_contents (args[i]); |
0c884e17 | 260 | for (j = 0; j < typelen; j += xstormy16_reg_size) |
1c6e1b0d PM |
261 | { |
262 | ULONGEST regval; | |
263 | int size = (typelen - j == 1) ? 1 : xstormy16_reg_size; | |
264 | ||
265 | regval = extract_unsigned_integer (val + j, size, byte_order); | |
266 | regcache_cooked_write_unsigned (regcache, argreg++, regval); | |
267 | } | |
0c884e17 CV |
268 | } |
269 | ||
270 | /* Align SP */ | |
b6fcb393 | 271 | stack_dest = xstormy16_frame_align (gdbarch, stack_dest); |
0c884e17 CV |
272 | |
273 | /* Loop backwards through remaining arguments and push them on the stack, | |
b6fcb393 | 274 | wordaligned. */ |
0c884e17 CV |
275 | for (j = nargs - 1; j >= i; j--) |
276 | { | |
ecfb0d68 | 277 | const gdb_byte *bytes = value_contents (args[j]); |
05c6a9a1 | 278 | |
4754a64e | 279 | typelen = TYPE_LENGTH (value_enclosing_type (args[j])); |
0c884e17 | 280 | slacklen = typelen & 1; |
726b2169 TT |
281 | gdb::byte_vector val (typelen + slacklen); |
282 | memcpy (val.data (), bytes, typelen); | |
283 | memset (val.data () + typelen, 0, slacklen); | |
0c884e17 | 284 | |
581e13c1 | 285 | /* Now write this data to the stack. The stack grows upwards. */ |
726b2169 | 286 | write_memory (stack_dest, val.data (), typelen + slacklen); |
0c884e17 CV |
287 | stack_dest += typelen + slacklen; |
288 | } | |
289 | ||
e17a4113 | 290 | store_unsigned_integer (buf, xstormy16_pc_size, byte_order, bp_addr); |
b6fcb393 CV |
291 | write_memory (stack_dest, buf, xstormy16_pc_size); |
292 | stack_dest += xstormy16_pc_size; | |
0c884e17 | 293 | |
b6fcb393 CV |
294 | /* Update stack pointer. */ |
295 | regcache_cooked_write_unsigned (regcache, E_SP_REGNUM, stack_dest); | |
0c884e17 | 296 | |
b6fcb393 CV |
297 | /* Return the new stack pointer minus the return address slot since |
298 | that's what DWARF2/GCC uses as the frame's CFA. */ | |
299 | return stack_dest - xstormy16_pc_size; | |
0c884e17 CV |
300 | } |
301 | ||
302 | /* Function: xstormy16_scan_prologue | |
303 | Decode the instructions within the given address range. | |
304 | Decide when we must have reached the end of the function prologue. | |
305 | If a frame_info pointer is provided, fill in its saved_regs etc. | |
306 | ||
b6fcb393 | 307 | Returns the address of the first instruction after the prologue. */ |
0c884e17 CV |
308 | |
309 | static CORE_ADDR | |
e17a4113 UW |
310 | xstormy16_analyze_prologue (struct gdbarch *gdbarch, |
311 | CORE_ADDR start_addr, CORE_ADDR end_addr, | |
b6fcb393 | 312 | struct xstormy16_frame_cache *cache, |
94afd7a6 | 313 | struct frame_info *this_frame) |
0c884e17 | 314 | { |
e17a4113 | 315 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
0c884e17 CV |
316 | CORE_ADDR next_addr; |
317 | ULONGEST inst, inst2; | |
318 | LONGEST offset; | |
319 | int regnum; | |
320 | ||
581e13c1 | 321 | /* Initialize framesize with size of PC put on stack by CALLF inst. */ |
b6fcb393 CV |
322 | cache->saved_regs[E_PC_REGNUM] = 0; |
323 | cache->framesize = xstormy16_pc_size; | |
324 | ||
325 | if (start_addr >= end_addr) | |
326 | return end_addr; | |
327 | ||
0c884e17 CV |
328 | for (next_addr = start_addr; |
329 | next_addr < end_addr; next_addr += xstormy16_inst_size) | |
330 | { | |
e17a4113 UW |
331 | inst = read_memory_unsigned_integer (next_addr, |
332 | xstormy16_inst_size, byte_order); | |
0c884e17 | 333 | inst2 = read_memory_unsigned_integer (next_addr + xstormy16_inst_size, |
e17a4113 | 334 | xstormy16_inst_size, byte_order); |
0c884e17 CV |
335 | |
336 | if (inst >= 0x0082 && inst <= 0x008d) /* push r2 .. push r13 */ | |
337 | { | |
b6fcb393 CV |
338 | regnum = inst & 0x000f; |
339 | cache->saved_regs[regnum] = cache->framesize; | |
340 | cache->framesize += xstormy16_reg_size; | |
0c884e17 CV |
341 | } |
342 | ||
581e13c1 MS |
343 | /* Optional stack allocation for args and local vars <= 4 byte. */ |
344 | else if (inst == 0x301f || inst == 0x303f) /* inc r15, #0x1/#0x3 */ | |
0c884e17 | 345 | { |
b6fcb393 | 346 | cache->framesize += ((inst & 0x0030) >> 4) + 1; |
0c884e17 CV |
347 | } |
348 | ||
349 | /* optional stack allocation for args and local vars > 4 && < 16 byte */ | |
350 | else if ((inst & 0xff0f) == 0x510f) /* 51Hf add r15, #0xH */ | |
351 | { | |
b6fcb393 | 352 | cache->framesize += (inst & 0x00f0) >> 4; |
0c884e17 CV |
353 | } |
354 | ||
581e13c1 MS |
355 | /* Optional stack allocation for args and local vars >= 16 byte. */ |
356 | else if (inst == 0x314f && inst2 >= 0x0010) /* 314f HHHH add r15, #0xH */ | |
0c884e17 | 357 | { |
b6fcb393 | 358 | cache->framesize += inst2; |
0c884e17 CV |
359 | next_addr += xstormy16_inst_size; |
360 | } | |
361 | ||
362 | else if (inst == 0x46fd) /* mov r13, r15 */ | |
363 | { | |
b6fcb393 | 364 | cache->uses_fp = 1; |
0c884e17 CV |
365 | } |
366 | ||
581e13c1 MS |
367 | /* optional copying of args in r2-r7 to r10-r13. */ |
368 | /* Probably only in optimized case but legal action for prologue. */ | |
0c884e17 CV |
369 | else if ((inst & 0xff00) == 0x4600 /* 46SD mov rD, rS */ |
370 | && (inst & 0x00f0) >= 0x0020 && (inst & 0x00f0) <= 0x0070 | |
3e3286a2 | 371 | && (inst & 0x000f) >= 0x000a && (inst & 0x000f) <= 0x000d) |
0c884e17 CV |
372 | ; |
373 | ||
581e13c1 MS |
374 | /* Optional copying of args in r2-r7 to stack. */ |
375 | /* 72DS HHHH mov.b (rD, 0xHHHH), r(S-8) | |
376 | (bit3 always 1, bit2-0 = reg) */ | |
0c884e17 CV |
377 | /* 73DS HHHH mov.w (rD, 0xHHHH), r(S-8) */ |
378 | else if ((inst & 0xfed8) == 0x72d8 && (inst & 0x0007) >= 2) | |
379 | { | |
b6fcb393 CV |
380 | regnum = inst & 0x0007; |
381 | /* Only 12 of 16 bits of the argument are used for the | |
581e13c1 | 382 | signed offset. */ |
b6fcb393 CV |
383 | offset = (LONGEST) (inst2 & 0x0fff); |
384 | if (offset & 0x0800) | |
385 | offset -= 0x1000; | |
386 | ||
387 | cache->saved_regs[regnum] = cache->framesize + offset; | |
0c884e17 CV |
388 | next_addr += xstormy16_inst_size; |
389 | } | |
0c884e17 | 390 | |
581e13c1 | 391 | else /* Not a prologue instruction. */ |
0c884e17 CV |
392 | break; |
393 | } | |
394 | ||
0c884e17 CV |
395 | return next_addr; |
396 | } | |
397 | ||
398 | /* Function: xstormy16_skip_prologue | |
399 | If the input address is in a function prologue, | |
400 | returns the address of the end of the prologue; | |
401 | else returns the input address. | |
402 | ||
403 | Note: the input address is likely to be the function start, | |
404 | since this function is mainly used for advancing a breakpoint | |
405 | to the first line, or stepping to the first line when we have | |
406 | stepped into a function call. */ | |
407 | ||
408 | static CORE_ADDR | |
6093d2eb | 409 | xstormy16_skip_prologue (struct gdbarch *gdbarch, CORE_ADDR pc) |
0c884e17 CV |
410 | { |
411 | CORE_ADDR func_addr = 0, func_end = 0; | |
2c02bd72 | 412 | const char *func_name; |
0c884e17 CV |
413 | |
414 | if (find_pc_partial_function (pc, &func_name, &func_addr, &func_end)) | |
415 | { | |
416 | struct symtab_and_line sal; | |
417 | struct symbol *sym; | |
b6fcb393 | 418 | struct xstormy16_frame_cache cache; |
57fdbbbe | 419 | CORE_ADDR plg_end; |
0c884e17 | 420 | |
28fe5f6a KB |
421 | memset (&cache, 0, sizeof cache); |
422 | ||
581e13c1 | 423 | /* Don't trust line number debug info in frameless functions. */ |
e17a4113 UW |
424 | plg_end = xstormy16_analyze_prologue (gdbarch, func_addr, func_end, |
425 | &cache, NULL); | |
b6fcb393 | 426 | if (!cache.uses_fp) |
211a4f69 CV |
427 | return plg_end; |
428 | ||
0c884e17 | 429 | /* Found a function. */ |
835a09d9 | 430 | sym = lookup_symbol (func_name, NULL, VAR_DOMAIN, NULL).symbol; |
581e13c1 | 431 | /* Don't use line number debug info for assembly source files. */ |
0c884e17 CV |
432 | if (sym && SYMBOL_LANGUAGE (sym) != language_asm) |
433 | { | |
0c884e17 CV |
434 | sal = find_pc_line (func_addr, 0); |
435 | if (sal.end && sal.end < func_end) | |
436 | { | |
437 | /* Found a line number, use it as end of prologue. */ | |
438 | return sal.end; | |
439 | } | |
440 | } | |
581e13c1 | 441 | /* No useable line symbol. Use result of prologue parsing method. */ |
211a4f69 | 442 | return plg_end; |
0c884e17 CV |
443 | } |
444 | ||
581e13c1 | 445 | /* No function symbol -- just return the PC. */ |
0c884e17 CV |
446 | |
447 | return (CORE_ADDR) pc; | |
448 | } | |
449 | ||
c9cf6e20 MG |
450 | /* Implement the stack_frame_destroyed_p gdbarch method. |
451 | ||
452 | The epilogue is defined here as the area at the end of a function, | |
0c884e17 | 453 | either on the `ret' instruction itself or after an instruction which |
581e13c1 | 454 | destroys the function's stack frame. */ |
c9cf6e20 | 455 | |
0c884e17 | 456 | static int |
c9cf6e20 | 457 | xstormy16_stack_frame_destroyed_p (struct gdbarch *gdbarch, CORE_ADDR pc) |
0c884e17 | 458 | { |
e17a4113 | 459 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
b6fcb393 | 460 | CORE_ADDR func_addr = 0, func_end = 0; |
0c884e17 CV |
461 | |
462 | if (find_pc_partial_function (pc, NULL, &func_addr, &func_end)) | |
463 | { | |
464 | ULONGEST inst, inst2; | |
465 | CORE_ADDR addr = func_end - xstormy16_inst_size; | |
466 | ||
581e13c1 | 467 | /* The Xstormy16 epilogue is max. 14 bytes long. */ |
0c884e17 CV |
468 | if (pc < func_end - 7 * xstormy16_inst_size) |
469 | return 0; | |
470 | ||
471 | /* Check if we're on a `ret' instruction. Otherwise it's | |
581e13c1 | 472 | too dangerous to proceed. */ |
e17a4113 UW |
473 | inst = read_memory_unsigned_integer (addr, |
474 | xstormy16_inst_size, byte_order); | |
0c884e17 CV |
475 | if (inst != 0x0003) |
476 | return 0; | |
477 | ||
478 | while ((addr -= xstormy16_inst_size) >= func_addr) | |
479 | { | |
e17a4113 | 480 | inst = read_memory_unsigned_integer (addr, |
581e13c1 MS |
481 | xstormy16_inst_size, |
482 | byte_order); | |
0c884e17 CV |
483 | if (inst >= 0x009a && inst <= 0x009d) /* pop r10...r13 */ |
484 | continue; | |
485 | if (inst == 0x305f || inst == 0x307f) /* dec r15, #0x1/#0x3 */ | |
486 | break; | |
487 | inst2 = read_memory_unsigned_integer (addr - xstormy16_inst_size, | |
581e13c1 MS |
488 | xstormy16_inst_size, |
489 | byte_order); | |
490 | if (inst2 == 0x314f && inst >= 0x8000) /* add r15, neg. value */ | |
0c884e17 CV |
491 | { |
492 | addr -= xstormy16_inst_size; | |
493 | break; | |
494 | } | |
495 | return 0; | |
496 | } | |
497 | if (pc > addr) | |
498 | return 1; | |
499 | } | |
500 | return 0; | |
501 | } | |
502 | ||
04180708 | 503 | constexpr gdb_byte xstormy16_break_insn[] = { 0x06, 0x0 }; |
598cc9dc | 504 | |
04180708 | 505 | typedef BP_MANIPULATION (xstormy16_break_insn) xstormy16_breakpoint; |
0c884e17 CV |
506 | |
507 | /* Given a pointer to a jump table entry, return the address | |
581e13c1 | 508 | of the function it jumps to. Return 0 if not found. */ |
0c884e17 | 509 | static CORE_ADDR |
e17a4113 | 510 | xstormy16_resolve_jmp_table_entry (struct gdbarch *gdbarch, CORE_ADDR faddr) |
0c884e17 | 511 | { |
e17a4113 | 512 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
0c884e17 CV |
513 | struct obj_section *faddr_sect = find_pc_section (faddr); |
514 | ||
515 | if (faddr_sect) | |
516 | { | |
517 | LONGEST inst, inst2, addr; | |
e362b510 | 518 | gdb_byte buf[2 * xstormy16_inst_size]; |
0c884e17 | 519 | |
581e13c1 | 520 | /* Return faddr if it's not pointing into the jump table. */ |
0c884e17 CV |
521 | if (strcmp (faddr_sect->the_bfd_section->name, ".plt")) |
522 | return faddr; | |
523 | ||
524 | if (!target_read_memory (faddr, buf, sizeof buf)) | |
525 | { | |
e17a4113 UW |
526 | inst = extract_unsigned_integer (buf, |
527 | xstormy16_inst_size, byte_order); | |
0c884e17 | 528 | inst2 = extract_unsigned_integer (buf + xstormy16_inst_size, |
e17a4113 | 529 | xstormy16_inst_size, byte_order); |
0c884e17 CV |
530 | addr = inst2 << 8 | (inst & 0xff); |
531 | return addr; | |
532 | } | |
533 | } | |
534 | return 0; | |
535 | } | |
536 | ||
537 | /* Given a function's address, attempt to find (and return) the | |
538 | address of the corresponding jump table entry. Return 0 if | |
581e13c1 | 539 | not found. */ |
0c884e17 | 540 | static CORE_ADDR |
e17a4113 | 541 | xstormy16_find_jmp_table_entry (struct gdbarch *gdbarch, CORE_ADDR faddr) |
0c884e17 | 542 | { |
e17a4113 | 543 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
0c884e17 CV |
544 | struct obj_section *faddr_sect = find_pc_section (faddr); |
545 | ||
546 | if (faddr_sect) | |
547 | { | |
548 | struct obj_section *osect; | |
549 | ||
581e13c1 | 550 | /* Return faddr if it's already a pointer to a jump table entry. */ |
0c884e17 CV |
551 | if (!strcmp (faddr_sect->the_bfd_section->name, ".plt")) |
552 | return faddr; | |
553 | ||
554 | ALL_OBJFILE_OSECTIONS (faddr_sect->objfile, osect) | |
555 | { | |
556 | if (!strcmp (osect->the_bfd_section->name, ".plt")) | |
557 | break; | |
558 | } | |
559 | ||
560 | if (osect < faddr_sect->objfile->sections_end) | |
561 | { | |
aded6f54 PA |
562 | CORE_ADDR addr, endaddr; |
563 | ||
564 | addr = obj_section_addr (osect); | |
565 | endaddr = obj_section_endaddr (osect); | |
566 | ||
567 | for (; addr < endaddr; addr += 2 * xstormy16_inst_size) | |
0c884e17 | 568 | { |
0c884e17 | 569 | LONGEST inst, inst2, faddr2; |
e362b510 | 570 | gdb_byte buf[2 * xstormy16_inst_size]; |
0c884e17 CV |
571 | |
572 | if (target_read_memory (addr, buf, sizeof buf)) | |
573 | return 0; | |
e17a4113 | 574 | inst = extract_unsigned_integer (buf, |
581e13c1 MS |
575 | xstormy16_inst_size, |
576 | byte_order); | |
0c884e17 | 577 | inst2 = extract_unsigned_integer (buf + xstormy16_inst_size, |
581e13c1 MS |
578 | xstormy16_inst_size, |
579 | byte_order); | |
0c884e17 CV |
580 | faddr2 = inst2 << 8 | (inst & 0xff); |
581 | if (faddr == faddr2) | |
582 | return addr; | |
583 | } | |
584 | } | |
585 | } | |
586 | return 0; | |
587 | } | |
588 | ||
589 | static CORE_ADDR | |
52f729a7 | 590 | xstormy16_skip_trampoline_code (struct frame_info *frame, CORE_ADDR pc) |
0c884e17 | 591 | { |
e17a4113 UW |
592 | struct gdbarch *gdbarch = get_frame_arch (frame); |
593 | CORE_ADDR tmp = xstormy16_resolve_jmp_table_entry (gdbarch, pc); | |
0c884e17 CV |
594 | |
595 | if (tmp && tmp != pc) | |
596 | return tmp; | |
597 | return 0; | |
598 | } | |
599 | ||
b6fcb393 CV |
600 | /* Function pointers are 16 bit. The address space is 24 bit, using |
601 | 32 bit addresses. Pointers to functions on the XStormy16 are implemented | |
602 | by using 16 bit pointers, which are either direct pointers in case the | |
603 | function begins below 0x10000, or indirect pointers into a jump table. | |
604 | The next two functions convert 16 bit pointers into 24 (32) bit addresses | |
605 | and vice versa. */ | |
606 | ||
0c884e17 | 607 | static CORE_ADDR |
9898f801 UW |
608 | xstormy16_pointer_to_address (struct gdbarch *gdbarch, |
609 | struct type *type, const gdb_byte *buf) | |
0c884e17 | 610 | { |
e17a4113 | 611 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
0c884e17 | 612 | enum type_code target = TYPE_CODE (TYPE_TARGET_TYPE (type)); |
e17a4113 UW |
613 | CORE_ADDR addr |
614 | = extract_unsigned_integer (buf, TYPE_LENGTH (type), byte_order); | |
0c884e17 CV |
615 | |
616 | if (target == TYPE_CODE_FUNC || target == TYPE_CODE_METHOD) | |
617 | { | |
e17a4113 | 618 | CORE_ADDR addr2 = xstormy16_resolve_jmp_table_entry (gdbarch, addr); |
0c884e17 CV |
619 | if (addr2) |
620 | addr = addr2; | |
621 | } | |
622 | ||
623 | return addr; | |
624 | } | |
625 | ||
626 | static void | |
9898f801 UW |
627 | xstormy16_address_to_pointer (struct gdbarch *gdbarch, |
628 | struct type *type, gdb_byte *buf, CORE_ADDR addr) | |
0c884e17 | 629 | { |
e17a4113 | 630 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
0c884e17 CV |
631 | enum type_code target = TYPE_CODE (TYPE_TARGET_TYPE (type)); |
632 | ||
633 | if (target == TYPE_CODE_FUNC || target == TYPE_CODE_METHOD) | |
634 | { | |
e17a4113 | 635 | CORE_ADDR addr2 = xstormy16_find_jmp_table_entry (gdbarch, addr); |
0c884e17 CV |
636 | if (addr2) |
637 | addr = addr2; | |
638 | } | |
e17a4113 | 639 | store_unsigned_integer (buf, TYPE_LENGTH (type), byte_order, addr); |
0c884e17 CV |
640 | } |
641 | ||
b6fcb393 CV |
642 | static struct xstormy16_frame_cache * |
643 | xstormy16_alloc_frame_cache (void) | |
0c884e17 | 644 | { |
b6fcb393 CV |
645 | struct xstormy16_frame_cache *cache; |
646 | int i; | |
647 | ||
648 | cache = FRAME_OBSTACK_ZALLOC (struct xstormy16_frame_cache); | |
649 | ||
650 | cache->base = 0; | |
651 | cache->saved_sp = 0; | |
652 | cache->pc = 0; | |
653 | cache->uses_fp = 0; | |
654 | cache->framesize = 0; | |
655 | for (i = 0; i < E_NUM_REGS; ++i) | |
656 | cache->saved_regs[i] = REG_UNAVAIL; | |
657 | ||
658 | return cache; | |
659 | } | |
660 | ||
661 | static struct xstormy16_frame_cache * | |
94afd7a6 | 662 | xstormy16_frame_cache (struct frame_info *this_frame, void **this_cache) |
b6fcb393 | 663 | { |
e17a4113 | 664 | struct gdbarch *gdbarch = get_frame_arch (this_frame); |
b6fcb393 CV |
665 | struct xstormy16_frame_cache *cache; |
666 | CORE_ADDR current_pc; | |
667 | int i; | |
668 | ||
669 | if (*this_cache) | |
19ba03f4 | 670 | return (struct xstormy16_frame_cache *) *this_cache; |
b6fcb393 CV |
671 | |
672 | cache = xstormy16_alloc_frame_cache (); | |
673 | *this_cache = cache; | |
674 | ||
94afd7a6 | 675 | cache->base = get_frame_register_unsigned (this_frame, E_FP_REGNUM); |
b6fcb393 CV |
676 | if (cache->base == 0) |
677 | return cache; | |
678 | ||
94afd7a6 UW |
679 | cache->pc = get_frame_func (this_frame); |
680 | current_pc = get_frame_pc (this_frame); | |
b6fcb393 | 681 | if (cache->pc) |
e17a4113 UW |
682 | xstormy16_analyze_prologue (gdbarch, cache->pc, current_pc, |
683 | cache, this_frame); | |
b6fcb393 CV |
684 | |
685 | if (!cache->uses_fp) | |
94afd7a6 | 686 | cache->base = get_frame_register_unsigned (this_frame, E_SP_REGNUM); |
b6fcb393 CV |
687 | |
688 | cache->saved_sp = cache->base - cache->framesize; | |
689 | ||
690 | for (i = 0; i < E_NUM_REGS; ++i) | |
691 | if (cache->saved_regs[i] != REG_UNAVAIL) | |
692 | cache->saved_regs[i] += cache->saved_sp; | |
693 | ||
694 | return cache; | |
0c884e17 CV |
695 | } |
696 | ||
94afd7a6 UW |
697 | static struct value * |
698 | xstormy16_frame_prev_register (struct frame_info *this_frame, | |
699 | void **this_cache, int regnum) | |
b6fcb393 | 700 | { |
94afd7a6 | 701 | struct xstormy16_frame_cache *cache = xstormy16_frame_cache (this_frame, |
b6fcb393 CV |
702 | this_cache); |
703 | gdb_assert (regnum >= 0); | |
704 | ||
705 | if (regnum == E_SP_REGNUM && cache->saved_sp) | |
94afd7a6 | 706 | return frame_unwind_got_constant (this_frame, regnum, cache->saved_sp); |
b6fcb393 CV |
707 | |
708 | if (regnum < E_NUM_REGS && cache->saved_regs[regnum] != REG_UNAVAIL) | |
94afd7a6 UW |
709 | return frame_unwind_got_memory (this_frame, regnum, |
710 | cache->saved_regs[regnum]); | |
b6fcb393 | 711 | |
94afd7a6 | 712 | return frame_unwind_got_register (this_frame, regnum, regnum); |
b6fcb393 CV |
713 | } |
714 | ||
715 | static void | |
94afd7a6 | 716 | xstormy16_frame_this_id (struct frame_info *this_frame, void **this_cache, |
b6fcb393 CV |
717 | struct frame_id *this_id) |
718 | { | |
94afd7a6 | 719 | struct xstormy16_frame_cache *cache = xstormy16_frame_cache (this_frame, |
b6fcb393 CV |
720 | this_cache); |
721 | ||
722 | /* This marks the outermost frame. */ | |
723 | if (cache->base == 0) | |
724 | return; | |
725 | ||
726 | *this_id = frame_id_build (cache->saved_sp, cache->pc); | |
727 | } | |
728 | ||
729 | static CORE_ADDR | |
94afd7a6 | 730 | xstormy16_frame_base_address (struct frame_info *this_frame, void **this_cache) |
b6fcb393 | 731 | { |
94afd7a6 | 732 | struct xstormy16_frame_cache *cache = xstormy16_frame_cache (this_frame, |
b6fcb393 CV |
733 | this_cache); |
734 | return cache->base; | |
735 | } | |
736 | ||
737 | static const struct frame_unwind xstormy16_frame_unwind = { | |
738 | NORMAL_FRAME, | |
8fbca658 | 739 | default_frame_unwind_stop_reason, |
b6fcb393 | 740 | xstormy16_frame_this_id, |
94afd7a6 UW |
741 | xstormy16_frame_prev_register, |
742 | NULL, | |
743 | default_frame_sniffer | |
b6fcb393 CV |
744 | }; |
745 | ||
746 | static const struct frame_base xstormy16_frame_base = { | |
747 | &xstormy16_frame_unwind, | |
748 | xstormy16_frame_base_address, | |
749 | xstormy16_frame_base_address, | |
750 | xstormy16_frame_base_address | |
751 | }; | |
752 | ||
b6fcb393 CV |
753 | static CORE_ADDR |
754 | xstormy16_unwind_sp (struct gdbarch *gdbarch, struct frame_info *next_frame) | |
755 | { | |
756 | return frame_unwind_register_unsigned (next_frame, E_SP_REGNUM); | |
757 | } | |
758 | ||
759 | static CORE_ADDR | |
760 | xstormy16_unwind_pc (struct gdbarch *gdbarch, struct frame_info *next_frame) | |
0c884e17 | 761 | { |
b6fcb393 | 762 | return frame_unwind_register_unsigned (next_frame, E_PC_REGNUM); |
0c884e17 CV |
763 | } |
764 | ||
b6fcb393 | 765 | static struct frame_id |
94afd7a6 | 766 | xstormy16_dummy_id (struct gdbarch *gdbarch, struct frame_info *this_frame) |
b6fcb393 | 767 | { |
94afd7a6 UW |
768 | CORE_ADDR sp = get_frame_register_unsigned (this_frame, E_SP_REGNUM); |
769 | return frame_id_build (sp, get_frame_pc (this_frame)); | |
b6fcb393 CV |
770 | } |
771 | ||
772 | ||
0c884e17 CV |
773 | /* Function: xstormy16_gdbarch_init |
774 | Initializer function for the xstormy16 gdbarch vector. | |
581e13c1 | 775 | Called by gdbarch. Sets up the gdbarch vector(s) for this target. */ |
0c884e17 CV |
776 | |
777 | static struct gdbarch * | |
778 | xstormy16_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches) | |
779 | { | |
0c884e17 CV |
780 | struct gdbarch *gdbarch; |
781 | ||
581e13c1 | 782 | /* find a candidate among the list of pre-declared architectures. */ |
0c884e17 CV |
783 | arches = gdbarch_list_lookup_by_info (arches, &info); |
784 | if (arches != NULL) | |
785 | return (arches->gdbarch); | |
786 | ||
b6fcb393 | 787 | gdbarch = gdbarch_alloc (&info, NULL); |
a5afb99f | 788 | |
0c884e17 | 789 | /* |
b6fcb393 | 790 | * Basic register fields and methods, datatype sizes and stuff. |
0c884e17 CV |
791 | */ |
792 | ||
793 | set_gdbarch_num_regs (gdbarch, E_NUM_REGS); | |
794 | set_gdbarch_num_pseudo_regs (gdbarch, 0); | |
795 | set_gdbarch_sp_regnum (gdbarch, E_SP_REGNUM); | |
0c884e17 CV |
796 | set_gdbarch_pc_regnum (gdbarch, E_PC_REGNUM); |
797 | set_gdbarch_register_name (gdbarch, xstormy16_register_name); | |
b6fcb393 | 798 | set_gdbarch_register_type (gdbarch, xstormy16_register_type); |
0c884e17 | 799 | |
71c08af0 | 800 | set_gdbarch_char_signed (gdbarch, 0); |
b6fcb393 | 801 | set_gdbarch_short_bit (gdbarch, 2 * TARGET_CHAR_BIT); |
0c884e17 | 802 | set_gdbarch_int_bit (gdbarch, 2 * TARGET_CHAR_BIT); |
b6fcb393 CV |
803 | set_gdbarch_long_bit (gdbarch, 4 * TARGET_CHAR_BIT); |
804 | set_gdbarch_long_long_bit (gdbarch, 8 * TARGET_CHAR_BIT); | |
805 | ||
53375380 PA |
806 | set_gdbarch_wchar_bit (gdbarch, 2 * TARGET_CHAR_BIT); |
807 | set_gdbarch_wchar_signed (gdbarch, 1); | |
808 | ||
b6fcb393 CV |
809 | set_gdbarch_float_bit (gdbarch, 4 * TARGET_CHAR_BIT); |
810 | set_gdbarch_double_bit (gdbarch, 8 * TARGET_CHAR_BIT); | |
811 | set_gdbarch_long_double_bit (gdbarch, 8 * TARGET_CHAR_BIT); | |
812 | ||
0c884e17 CV |
813 | set_gdbarch_ptr_bit (gdbarch, 2 * TARGET_CHAR_BIT); |
814 | set_gdbarch_addr_bit (gdbarch, 4 * TARGET_CHAR_BIT); | |
8da614df | 815 | set_gdbarch_dwarf2_addr_size (gdbarch, 4); |
0c884e17 CV |
816 | |
817 | set_gdbarch_address_to_pointer (gdbarch, xstormy16_address_to_pointer); | |
818 | set_gdbarch_pointer_to_address (gdbarch, xstormy16_pointer_to_address); | |
819 | ||
581e13c1 | 820 | /* Stack grows up. */ |
b6fcb393 | 821 | set_gdbarch_inner_than (gdbarch, core_addr_greaterthan); |
0c884e17 | 822 | |
b6fcb393 CV |
823 | /* |
824 | * Frame Info | |
825 | */ | |
826 | set_gdbarch_unwind_sp (gdbarch, xstormy16_unwind_sp); | |
827 | set_gdbarch_unwind_pc (gdbarch, xstormy16_unwind_pc); | |
94afd7a6 | 828 | set_gdbarch_dummy_id (gdbarch, xstormy16_dummy_id); |
b6fcb393 CV |
829 | set_gdbarch_frame_align (gdbarch, xstormy16_frame_align); |
830 | frame_base_set_default (gdbarch, &xstormy16_frame_base); | |
0c884e17 | 831 | |
b6fcb393 | 832 | set_gdbarch_skip_prologue (gdbarch, xstormy16_skip_prologue); |
c9cf6e20 MG |
833 | set_gdbarch_stack_frame_destroyed_p (gdbarch, |
834 | xstormy16_stack_frame_destroyed_p); | |
b6fcb393 CV |
835 | |
836 | /* These values and methods are used when gdb calls a target function. */ | |
837 | set_gdbarch_push_dummy_call (gdbarch, xstormy16_push_dummy_call); | |
04180708 YQ |
838 | set_gdbarch_breakpoint_kind_from_pc (gdbarch, |
839 | xstormy16_breakpoint::kind_from_pc); | |
840 | set_gdbarch_sw_breakpoint_from_kind (gdbarch, | |
841 | xstormy16_breakpoint::bp_from_kind); | |
b6fcb393 CV |
842 | set_gdbarch_return_value (gdbarch, xstormy16_return_value); |
843 | ||
844 | set_gdbarch_skip_trampoline_code (gdbarch, xstormy16_skip_trampoline_code); | |
0c884e17 | 845 | |
b6fcb393 CV |
846 | gdbarch_init_osabi (info, gdbarch); |
847 | ||
94afd7a6 UW |
848 | dwarf2_append_unwinders (gdbarch); |
849 | frame_unwind_append_unwinder (gdbarch, &xstormy16_frame_unwind); | |
b6fcb393 | 850 | |
0c884e17 CV |
851 | return gdbarch; |
852 | } | |
853 | ||
854 | /* Function: _initialize_xstormy16_tdep | |
855 | Initializer function for the Sanyo Xstormy16a module. | |
581e13c1 | 856 | Called by gdb at start-up. */ |
0c884e17 CV |
857 | |
858 | void | |
859 | _initialize_xstormy16_tdep (void) | |
860 | { | |
0c884e17 | 861 | register_gdbarch_init (bfd_arch_xstormy16, xstormy16_gdbarch_init); |
0c884e17 | 862 | } |