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0c884e17 | 1 | /* Target-dependent code for the Sanyo Xstormy16a (LC590000) processor. |
f4f9705a | 2 | |
1d506c26 | 3 | Copyright (C) 2001-2024 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" | |
82ca8957 | 24 | #include "dwarf2/frame.h" |
b6fcb393 CV |
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" |
268a13a5 | 36 | #include "gdbsupport/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. | |
85102364 | 46 | R15 is used implicitly 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 | ||
69f6730d | 111 | static_assert (ARRAY_SIZE (register_names) == E_NUM_REGS); |
9b9e61c7 | 112 | return register_names[regnum]; |
0c884e17 CV |
113 | } |
114 | ||
0c884e17 | 115 | static struct type * |
b6fcb393 | 116 | xstormy16_register_type (struct gdbarch *gdbarch, int regnum) |
0c884e17 | 117 | { |
b6fcb393 | 118 | if (regnum == E_PC_REGNUM) |
df4df182 | 119 | return builtin_type (gdbarch)->builtin_uint32; |
0c884e17 | 120 | else |
df4df182 | 121 | return builtin_type (gdbarch)->builtin_uint16; |
0c884e17 CV |
122 | } |
123 | ||
0c884e17 CV |
124 | /* Function: xstormy16_type_is_scalar |
125 | Makes the decision if a given type is a scalar types. Scalar | |
b6fcb393 | 126 | types are returned in the registers r2-r7 as they fit. */ |
0c884e17 CV |
127 | |
128 | static int | |
129 | xstormy16_type_is_scalar (struct type *t) | |
130 | { | |
78134374 SM |
131 | return (t->code () != TYPE_CODE_STRUCT |
132 | && t->code () != TYPE_CODE_UNION | |
133 | && t->code () != TYPE_CODE_ARRAY); | |
0c884e17 CV |
134 | } |
135 | ||
b6fcb393 CV |
136 | /* Function: xstormy16_use_struct_convention |
137 | Returns non-zero if the given struct type will be returned using | |
138 | a special convention, rather than the normal function return method. | |
139 | 7sed in the contexts of the "return" command, and of | |
140 | target function calls from the debugger. */ | |
141 | ||
142 | static int | |
143 | xstormy16_use_struct_convention (struct type *type) | |
144 | { | |
145 | return !xstormy16_type_is_scalar (type) | |
df86565b | 146 | || type->length () > E_MAX_RETTYPE_SIZE_IN_REGS; |
b6fcb393 CV |
147 | } |
148 | ||
0c884e17 | 149 | /* Function: xstormy16_extract_return_value |
b6fcb393 CV |
150 | Find a function's return value in the appropriate registers (in |
151 | regbuf), and copy it into valbuf. */ | |
0c884e17 CV |
152 | |
153 | static void | |
b6fcb393 | 154 | xstormy16_extract_return_value (struct type *type, struct regcache *regcache, |
948f8e3d | 155 | gdb_byte *valbuf) |
0c884e17 | 156 | { |
df86565b | 157 | int len = type->length (); |
b6fcb393 | 158 | int i, regnum = E_1ST_ARG_REGNUM; |
0c884e17 | 159 | |
b6fcb393 | 160 | for (i = 0; i < len; i += xstormy16_reg_size) |
0b883586 | 161 | regcache->raw_read (regnum++, valbuf + i); |
b6fcb393 CV |
162 | } |
163 | ||
164 | /* Function: xstormy16_store_return_value | |
165 | Copy the function return value from VALBUF into the | |
166 | proper location for a function return. | |
167 | Called only in the context of the "return" command. */ | |
168 | ||
169 | static void | |
170 | xstormy16_store_return_value (struct type *type, struct regcache *regcache, | |
948f8e3d | 171 | const gdb_byte *valbuf) |
b6fcb393 | 172 | { |
df86565b | 173 | if (type->length () == 1) |
b6fcb393 | 174 | { |
581e13c1 | 175 | /* Add leading zeros to the value. */ |
e362b510 | 176 | gdb_byte buf[xstormy16_reg_size]; |
b6fcb393 CV |
177 | memset (buf, 0, xstormy16_reg_size); |
178 | memcpy (buf, valbuf, 1); | |
10eaee5f | 179 | regcache->raw_write (E_1ST_ARG_REGNUM, buf); |
0c884e17 CV |
180 | } |
181 | else | |
182 | { | |
df86565b | 183 | int len = type->length (); |
b6fcb393 | 184 | int i, regnum = E_1ST_ARG_REGNUM; |
0c884e17 | 185 | |
b6fcb393 | 186 | for (i = 0; i < len; i += xstormy16_reg_size) |
dda83cd7 | 187 | regcache->raw_write (regnum++, valbuf + i); |
0c884e17 CV |
188 | } |
189 | } | |
190 | ||
b6fcb393 | 191 | static enum return_value_convention |
6a3a010b | 192 | xstormy16_return_value (struct gdbarch *gdbarch, struct value *function, |
c055b101 | 193 | struct type *type, struct regcache *regcache, |
05c6a9a1 | 194 | gdb_byte *readbuf, const gdb_byte *writebuf) |
b6fcb393 CV |
195 | { |
196 | if (xstormy16_use_struct_convention (type)) | |
197 | return RETURN_VALUE_STRUCT_CONVENTION; | |
198 | if (writebuf) | |
199 | xstormy16_store_return_value (type, regcache, writebuf); | |
200 | else if (readbuf) | |
201 | xstormy16_extract_return_value (type, regcache, readbuf); | |
202 | return RETURN_VALUE_REGISTER_CONVENTION; | |
203 | } | |
204 | ||
205 | static CORE_ADDR | |
206 | xstormy16_frame_align (struct gdbarch *gdbarch, CORE_ADDR addr) | |
207 | { | |
208 | if (addr & 1) | |
209 | ++addr; | |
210 | return addr; | |
211 | } | |
212 | ||
213 | /* Function: xstormy16_push_dummy_call | |
0c884e17 CV |
214 | Setup the function arguments for GDB to call a function in the inferior. |
215 | Called only in the context of a target function call from the debugger. | |
b6fcb393 | 216 | Returns the value of the SP register after the args are pushed. */ |
0c884e17 CV |
217 | |
218 | static CORE_ADDR | |
b6fcb393 CV |
219 | xstormy16_push_dummy_call (struct gdbarch *gdbarch, |
220 | struct value *function, | |
221 | struct regcache *regcache, | |
222 | CORE_ADDR bp_addr, int nargs, | |
223 | struct value **args, | |
cf84fa6b AH |
224 | CORE_ADDR sp, |
225 | function_call_return_method return_method, | |
b6fcb393 | 226 | CORE_ADDR struct_addr) |
0c884e17 | 227 | { |
e17a4113 | 228 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
0c884e17 CV |
229 | CORE_ADDR stack_dest = sp; |
230 | int argreg = E_1ST_ARG_REGNUM; | |
231 | int i, j; | |
232 | int typelen, slacklen; | |
e362b510 | 233 | gdb_byte buf[xstormy16_pc_size]; |
0c884e17 | 234 | |
cf84fa6b AH |
235 | /* If returning a struct using target ABI method, then the struct return |
236 | address will consume one argument-passing register. */ | |
237 | if (return_method == return_method_struct) | |
b6fcb393 CV |
238 | { |
239 | regcache_cooked_write_unsigned (regcache, E_PTR_RET_REGNUM, struct_addr); | |
240 | argreg++; | |
241 | } | |
0c884e17 | 242 | |
581e13c1 | 243 | /* Arguments are passed in R2-R7 as they fit. If an argument doesn't |
0c884e17 CV |
244 | fit in the remaining registers we're switching over to the stack. |
245 | No argument is put on stack partially and as soon as we switched | |
246 | over to stack no further argument is put in a register even if it | |
b6fcb393 | 247 | would fit in the remaining unused registers. */ |
0c884e17 CV |
248 | for (i = 0; i < nargs && argreg <= E_LST_ARG_REGNUM; i++) |
249 | { | |
463b870d | 250 | typelen = args[i]->enclosing_type ()->length (); |
0c884e17 CV |
251 | if (typelen > E_MAX_RETTYPE_SIZE (argreg)) |
252 | break; | |
253 | ||
581e13c1 | 254 | /* Put argument into registers wordwise. */ |
efaf1ae0 | 255 | const gdb_byte *val = args[i]->contents ().data (); |
0c884e17 | 256 | for (j = 0; j < typelen; j += xstormy16_reg_size) |
1c6e1b0d PM |
257 | { |
258 | ULONGEST regval; | |
259 | int size = (typelen - j == 1) ? 1 : xstormy16_reg_size; | |
260 | ||
261 | regval = extract_unsigned_integer (val + j, size, byte_order); | |
262 | regcache_cooked_write_unsigned (regcache, argreg++, regval); | |
263 | } | |
0c884e17 CV |
264 | } |
265 | ||
266 | /* Align SP */ | |
b6fcb393 | 267 | stack_dest = xstormy16_frame_align (gdbarch, stack_dest); |
0c884e17 CV |
268 | |
269 | /* Loop backwards through remaining arguments and push them on the stack, | |
b6fcb393 | 270 | wordaligned. */ |
0c884e17 CV |
271 | for (j = nargs - 1; j >= i; j--) |
272 | { | |
efaf1ae0 | 273 | const gdb_byte *bytes = args[j]->contents ().data (); |
05c6a9a1 | 274 | |
463b870d | 275 | typelen = args[j]->enclosing_type ()->length (); |
0c884e17 | 276 | slacklen = typelen & 1; |
726b2169 TT |
277 | gdb::byte_vector val (typelen + slacklen); |
278 | memcpy (val.data (), bytes, typelen); | |
279 | memset (val.data () + typelen, 0, slacklen); | |
0c884e17 | 280 | |
581e13c1 | 281 | /* Now write this data to the stack. The stack grows upwards. */ |
726b2169 | 282 | write_memory (stack_dest, val.data (), typelen + slacklen); |
0c884e17 CV |
283 | stack_dest += typelen + slacklen; |
284 | } | |
285 | ||
e17a4113 | 286 | store_unsigned_integer (buf, xstormy16_pc_size, byte_order, bp_addr); |
b6fcb393 CV |
287 | write_memory (stack_dest, buf, xstormy16_pc_size); |
288 | stack_dest += xstormy16_pc_size; | |
0c884e17 | 289 | |
b6fcb393 CV |
290 | /* Update stack pointer. */ |
291 | regcache_cooked_write_unsigned (regcache, E_SP_REGNUM, stack_dest); | |
0c884e17 | 292 | |
b6fcb393 CV |
293 | /* Return the new stack pointer minus the return address slot since |
294 | that's what DWARF2/GCC uses as the frame's CFA. */ | |
295 | return stack_dest - xstormy16_pc_size; | |
0c884e17 CV |
296 | } |
297 | ||
298 | /* Function: xstormy16_scan_prologue | |
299 | Decode the instructions within the given address range. | |
300 | Decide when we must have reached the end of the function prologue. | |
301 | If a frame_info pointer is provided, fill in its saved_regs etc. | |
302 | ||
b6fcb393 | 303 | Returns the address of the first instruction after the prologue. */ |
0c884e17 CV |
304 | |
305 | static CORE_ADDR | |
e17a4113 UW |
306 | xstormy16_analyze_prologue (struct gdbarch *gdbarch, |
307 | CORE_ADDR start_addr, CORE_ADDR end_addr, | |
b6fcb393 | 308 | struct xstormy16_frame_cache *cache, |
bd2b40ac | 309 | frame_info_ptr this_frame) |
0c884e17 | 310 | { |
e17a4113 | 311 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
0c884e17 CV |
312 | CORE_ADDR next_addr; |
313 | ULONGEST inst, inst2; | |
314 | LONGEST offset; | |
315 | int regnum; | |
316 | ||
581e13c1 | 317 | /* Initialize framesize with size of PC put on stack by CALLF inst. */ |
b6fcb393 CV |
318 | cache->saved_regs[E_PC_REGNUM] = 0; |
319 | cache->framesize = xstormy16_pc_size; | |
320 | ||
321 | if (start_addr >= end_addr) | |
322 | return end_addr; | |
323 | ||
0c884e17 CV |
324 | for (next_addr = start_addr; |
325 | next_addr < end_addr; next_addr += xstormy16_inst_size) | |
326 | { | |
e17a4113 UW |
327 | inst = read_memory_unsigned_integer (next_addr, |
328 | xstormy16_inst_size, byte_order); | |
0c884e17 | 329 | inst2 = read_memory_unsigned_integer (next_addr + xstormy16_inst_size, |
e17a4113 | 330 | xstormy16_inst_size, byte_order); |
0c884e17 CV |
331 | |
332 | if (inst >= 0x0082 && inst <= 0x008d) /* push r2 .. push r13 */ | |
333 | { | |
b6fcb393 CV |
334 | regnum = inst & 0x000f; |
335 | cache->saved_regs[regnum] = cache->framesize; | |
336 | cache->framesize += xstormy16_reg_size; | |
0c884e17 CV |
337 | } |
338 | ||
581e13c1 MS |
339 | /* Optional stack allocation for args and local vars <= 4 byte. */ |
340 | else if (inst == 0x301f || inst == 0x303f) /* inc r15, #0x1/#0x3 */ | |
0c884e17 | 341 | { |
b6fcb393 | 342 | cache->framesize += ((inst & 0x0030) >> 4) + 1; |
0c884e17 CV |
343 | } |
344 | ||
345 | /* optional stack allocation for args and local vars > 4 && < 16 byte */ | |
346 | else if ((inst & 0xff0f) == 0x510f) /* 51Hf add r15, #0xH */ | |
347 | { | |
b6fcb393 | 348 | cache->framesize += (inst & 0x00f0) >> 4; |
0c884e17 CV |
349 | } |
350 | ||
581e13c1 MS |
351 | /* Optional stack allocation for args and local vars >= 16 byte. */ |
352 | else if (inst == 0x314f && inst2 >= 0x0010) /* 314f HHHH add r15, #0xH */ | |
0c884e17 | 353 | { |
b6fcb393 | 354 | cache->framesize += inst2; |
0c884e17 CV |
355 | next_addr += xstormy16_inst_size; |
356 | } | |
357 | ||
358 | else if (inst == 0x46fd) /* mov r13, r15 */ | |
359 | { | |
b6fcb393 | 360 | cache->uses_fp = 1; |
0c884e17 CV |
361 | } |
362 | ||
581e13c1 MS |
363 | /* optional copying of args in r2-r7 to r10-r13. */ |
364 | /* Probably only in optimized case but legal action for prologue. */ | |
0c884e17 CV |
365 | else if ((inst & 0xff00) == 0x4600 /* 46SD mov rD, rS */ |
366 | && (inst & 0x00f0) >= 0x0020 && (inst & 0x00f0) <= 0x0070 | |
3e3286a2 | 367 | && (inst & 0x000f) >= 0x000a && (inst & 0x000f) <= 0x000d) |
0c884e17 CV |
368 | ; |
369 | ||
581e13c1 MS |
370 | /* Optional copying of args in r2-r7 to stack. */ |
371 | /* 72DS HHHH mov.b (rD, 0xHHHH), r(S-8) | |
372 | (bit3 always 1, bit2-0 = reg) */ | |
0c884e17 CV |
373 | /* 73DS HHHH mov.w (rD, 0xHHHH), r(S-8) */ |
374 | else if ((inst & 0xfed8) == 0x72d8 && (inst & 0x0007) >= 2) | |
375 | { | |
b6fcb393 CV |
376 | regnum = inst & 0x0007; |
377 | /* Only 12 of 16 bits of the argument are used for the | |
581e13c1 | 378 | signed offset. */ |
b6fcb393 CV |
379 | offset = (LONGEST) (inst2 & 0x0fff); |
380 | if (offset & 0x0800) | |
381 | offset -= 0x1000; | |
382 | ||
383 | cache->saved_regs[regnum] = cache->framesize + offset; | |
0c884e17 CV |
384 | next_addr += xstormy16_inst_size; |
385 | } | |
0c884e17 | 386 | |
581e13c1 | 387 | else /* Not a prologue instruction. */ |
0c884e17 CV |
388 | break; |
389 | } | |
390 | ||
0c884e17 CV |
391 | return next_addr; |
392 | } | |
393 | ||
394 | /* Function: xstormy16_skip_prologue | |
395 | If the input address is in a function prologue, | |
396 | returns the address of the end of the prologue; | |
397 | else returns the input address. | |
398 | ||
399 | Note: the input address is likely to be the function start, | |
400 | since this function is mainly used for advancing a breakpoint | |
401 | to the first line, or stepping to the first line when we have | |
402 | stepped into a function call. */ | |
403 | ||
404 | static CORE_ADDR | |
6093d2eb | 405 | xstormy16_skip_prologue (struct gdbarch *gdbarch, CORE_ADDR pc) |
0c884e17 CV |
406 | { |
407 | CORE_ADDR func_addr = 0, func_end = 0; | |
2c02bd72 | 408 | const char *func_name; |
0c884e17 CV |
409 | |
410 | if (find_pc_partial_function (pc, &func_name, &func_addr, &func_end)) | |
411 | { | |
412 | struct symtab_and_line sal; | |
413 | struct symbol *sym; | |
b6fcb393 | 414 | struct xstormy16_frame_cache cache; |
57fdbbbe | 415 | CORE_ADDR plg_end; |
0c884e17 | 416 | |
28fe5f6a KB |
417 | memset (&cache, 0, sizeof cache); |
418 | ||
581e13c1 | 419 | /* Don't trust line number debug info in frameless functions. */ |
e17a4113 UW |
420 | plg_end = xstormy16_analyze_prologue (gdbarch, func_addr, func_end, |
421 | &cache, NULL); | |
b6fcb393 | 422 | if (!cache.uses_fp) |
dda83cd7 | 423 | return plg_end; |
211a4f69 | 424 | |
0c884e17 | 425 | /* Found a function. */ |
ccf41c24 TT |
426 | sym = lookup_symbol (func_name, NULL, SEARCH_FUNCTION_DOMAIN, |
427 | nullptr).symbol; | |
581e13c1 | 428 | /* Don't use line number debug info for assembly source files. */ |
c1b5c1eb | 429 | if (sym && sym->language () != language_asm) |
0c884e17 | 430 | { |
0c884e17 CV |
431 | sal = find_pc_line (func_addr, 0); |
432 | if (sal.end && sal.end < func_end) | |
433 | { | |
434 | /* Found a line number, use it as end of prologue. */ | |
435 | return sal.end; | |
436 | } | |
437 | } | |
581e13c1 | 438 | /* No useable line symbol. Use result of prologue parsing method. */ |
211a4f69 | 439 | return plg_end; |
0c884e17 CV |
440 | } |
441 | ||
581e13c1 | 442 | /* No function symbol -- just return the PC. */ |
0c884e17 CV |
443 | |
444 | return (CORE_ADDR) pc; | |
445 | } | |
446 | ||
c9cf6e20 MG |
447 | /* Implement the stack_frame_destroyed_p gdbarch method. |
448 | ||
449 | The epilogue is defined here as the area at the end of a function, | |
0c884e17 | 450 | either on the `ret' instruction itself or after an instruction which |
581e13c1 | 451 | destroys the function's stack frame. */ |
c9cf6e20 | 452 | |
0c884e17 | 453 | static int |
c9cf6e20 | 454 | xstormy16_stack_frame_destroyed_p (struct gdbarch *gdbarch, CORE_ADDR pc) |
0c884e17 | 455 | { |
e17a4113 | 456 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
b6fcb393 | 457 | CORE_ADDR func_addr = 0, func_end = 0; |
0c884e17 CV |
458 | |
459 | if (find_pc_partial_function (pc, NULL, &func_addr, &func_end)) | |
460 | { | |
461 | ULONGEST inst, inst2; | |
462 | CORE_ADDR addr = func_end - xstormy16_inst_size; | |
463 | ||
581e13c1 | 464 | /* The Xstormy16 epilogue is max. 14 bytes long. */ |
0c884e17 CV |
465 | if (pc < func_end - 7 * xstormy16_inst_size) |
466 | return 0; | |
467 | ||
468 | /* Check if we're on a `ret' instruction. Otherwise it's | |
dda83cd7 | 469 | too dangerous to proceed. */ |
e17a4113 UW |
470 | inst = read_memory_unsigned_integer (addr, |
471 | xstormy16_inst_size, byte_order); | |
0c884e17 CV |
472 | if (inst != 0x0003) |
473 | return 0; | |
474 | ||
475 | while ((addr -= xstormy16_inst_size) >= func_addr) | |
476 | { | |
e17a4113 | 477 | inst = read_memory_unsigned_integer (addr, |
581e13c1 MS |
478 | xstormy16_inst_size, |
479 | byte_order); | |
0c884e17 CV |
480 | if (inst >= 0x009a && inst <= 0x009d) /* pop r10...r13 */ |
481 | continue; | |
482 | if (inst == 0x305f || inst == 0x307f) /* dec r15, #0x1/#0x3 */ | |
483 | break; | |
484 | inst2 = read_memory_unsigned_integer (addr - xstormy16_inst_size, | |
581e13c1 MS |
485 | xstormy16_inst_size, |
486 | byte_order); | |
487 | if (inst2 == 0x314f && inst >= 0x8000) /* add r15, neg. value */ | |
0c884e17 CV |
488 | { |
489 | addr -= xstormy16_inst_size; | |
490 | break; | |
491 | } | |
492 | return 0; | |
493 | } | |
494 | if (pc > addr) | |
495 | return 1; | |
496 | } | |
497 | return 0; | |
498 | } | |
499 | ||
04180708 | 500 | constexpr gdb_byte xstormy16_break_insn[] = { 0x06, 0x0 }; |
598cc9dc | 501 | |
04180708 | 502 | typedef BP_MANIPULATION (xstormy16_break_insn) xstormy16_breakpoint; |
0c884e17 CV |
503 | |
504 | /* Given a pointer to a jump table entry, return the address | |
581e13c1 | 505 | of the function it jumps to. Return 0 if not found. */ |
0c884e17 | 506 | static CORE_ADDR |
e17a4113 | 507 | xstormy16_resolve_jmp_table_entry (struct gdbarch *gdbarch, CORE_ADDR faddr) |
0c884e17 | 508 | { |
e17a4113 | 509 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
0c884e17 CV |
510 | struct obj_section *faddr_sect = find_pc_section (faddr); |
511 | ||
512 | if (faddr_sect) | |
513 | { | |
514 | LONGEST inst, inst2, addr; | |
e362b510 | 515 | gdb_byte buf[2 * xstormy16_inst_size]; |
0c884e17 | 516 | |
581e13c1 | 517 | /* Return faddr if it's not pointing into the jump table. */ |
0c884e17 CV |
518 | if (strcmp (faddr_sect->the_bfd_section->name, ".plt")) |
519 | return faddr; | |
520 | ||
521 | if (!target_read_memory (faddr, buf, sizeof buf)) | |
522 | { | |
e17a4113 UW |
523 | inst = extract_unsigned_integer (buf, |
524 | xstormy16_inst_size, byte_order); | |
0c884e17 | 525 | inst2 = extract_unsigned_integer (buf + xstormy16_inst_size, |
e17a4113 | 526 | xstormy16_inst_size, byte_order); |
0c884e17 CV |
527 | addr = inst2 << 8 | (inst & 0xff); |
528 | return addr; | |
529 | } | |
530 | } | |
531 | return 0; | |
532 | } | |
533 | ||
534 | /* Given a function's address, attempt to find (and return) the | |
535 | address of the corresponding jump table entry. Return 0 if | |
581e13c1 | 536 | not found. */ |
0c884e17 | 537 | static CORE_ADDR |
e17a4113 | 538 | xstormy16_find_jmp_table_entry (struct gdbarch *gdbarch, CORE_ADDR faddr) |
0c884e17 | 539 | { |
e17a4113 | 540 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
0c884e17 CV |
541 | struct obj_section *faddr_sect = find_pc_section (faddr); |
542 | ||
543 | if (faddr_sect) | |
544 | { | |
581e13c1 | 545 | /* Return faddr if it's already a pointer to a jump table entry. */ |
0c884e17 CV |
546 | if (!strcmp (faddr_sect->the_bfd_section->name, ".plt")) |
547 | return faddr; | |
548 | ||
5250cbc8 | 549 | for (obj_section *osect : faddr_sect->objfile->sections ()) |
0c884e17 | 550 | { |
5250cbc8 | 551 | if (!strcmp (osect->the_bfd_section->name, ".plt")) |
0c884e17 | 552 | { |
5250cbc8 TT |
553 | CORE_ADDR addr, endaddr; |
554 | ||
555 | addr = osect->addr (); | |
556 | endaddr = osect->endaddr (); | |
557 | ||
558 | for (; addr < endaddr; addr += 2 * xstormy16_inst_size) | |
559 | { | |
560 | LONGEST inst, inst2, faddr2; | |
561 | gdb_byte buf[2 * xstormy16_inst_size]; | |
562 | ||
563 | if (target_read_memory (addr, buf, sizeof buf)) | |
564 | return 0; | |
565 | inst = extract_unsigned_integer (buf, | |
566 | xstormy16_inst_size, | |
567 | byte_order); | |
568 | inst2 = extract_unsigned_integer (buf + xstormy16_inst_size, | |
569 | xstormy16_inst_size, | |
570 | byte_order); | |
571 | faddr2 = inst2 << 8 | (inst & 0xff); | |
572 | if (faddr == faddr2) | |
573 | return addr; | |
574 | } | |
0c884e17 | 575 | |
5250cbc8 | 576 | break; |
0c884e17 CV |
577 | } |
578 | } | |
579 | } | |
580 | return 0; | |
581 | } | |
582 | ||
583 | static CORE_ADDR | |
bd2b40ac | 584 | xstormy16_skip_trampoline_code (frame_info_ptr frame, CORE_ADDR pc) |
0c884e17 | 585 | { |
e17a4113 UW |
586 | struct gdbarch *gdbarch = get_frame_arch (frame); |
587 | CORE_ADDR tmp = xstormy16_resolve_jmp_table_entry (gdbarch, pc); | |
0c884e17 CV |
588 | |
589 | if (tmp && tmp != pc) | |
590 | return tmp; | |
591 | return 0; | |
592 | } | |
593 | ||
b6fcb393 CV |
594 | /* Function pointers are 16 bit. The address space is 24 bit, using |
595 | 32 bit addresses. Pointers to functions on the XStormy16 are implemented | |
596 | by using 16 bit pointers, which are either direct pointers in case the | |
597 | function begins below 0x10000, or indirect pointers into a jump table. | |
598 | The next two functions convert 16 bit pointers into 24 (32) bit addresses | |
599 | and vice versa. */ | |
600 | ||
0c884e17 | 601 | static CORE_ADDR |
9898f801 UW |
602 | xstormy16_pointer_to_address (struct gdbarch *gdbarch, |
603 | struct type *type, const gdb_byte *buf) | |
0c884e17 | 604 | { |
e17a4113 | 605 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
27710edb | 606 | enum type_code target = type->target_type ()->code (); |
e17a4113 | 607 | CORE_ADDR addr |
df86565b | 608 | = extract_unsigned_integer (buf, type->length (), byte_order); |
0c884e17 CV |
609 | |
610 | if (target == TYPE_CODE_FUNC || target == TYPE_CODE_METHOD) | |
611 | { | |
e17a4113 | 612 | CORE_ADDR addr2 = xstormy16_resolve_jmp_table_entry (gdbarch, addr); |
0c884e17 CV |
613 | if (addr2) |
614 | addr = addr2; | |
615 | } | |
616 | ||
617 | return addr; | |
618 | } | |
619 | ||
620 | static void | |
9898f801 UW |
621 | xstormy16_address_to_pointer (struct gdbarch *gdbarch, |
622 | struct type *type, gdb_byte *buf, CORE_ADDR addr) | |
0c884e17 | 623 | { |
e17a4113 | 624 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
27710edb | 625 | enum type_code target = type->target_type ()->code (); |
0c884e17 CV |
626 | |
627 | if (target == TYPE_CODE_FUNC || target == TYPE_CODE_METHOD) | |
628 | { | |
e17a4113 | 629 | CORE_ADDR addr2 = xstormy16_find_jmp_table_entry (gdbarch, addr); |
0c884e17 CV |
630 | if (addr2) |
631 | addr = addr2; | |
632 | } | |
df86565b | 633 | store_unsigned_integer (buf, type->length (), byte_order, addr); |
0c884e17 CV |
634 | } |
635 | ||
b6fcb393 CV |
636 | static struct xstormy16_frame_cache * |
637 | xstormy16_alloc_frame_cache (void) | |
0c884e17 | 638 | { |
b6fcb393 CV |
639 | struct xstormy16_frame_cache *cache; |
640 | int i; | |
641 | ||
642 | cache = FRAME_OBSTACK_ZALLOC (struct xstormy16_frame_cache); | |
643 | ||
644 | cache->base = 0; | |
645 | cache->saved_sp = 0; | |
646 | cache->pc = 0; | |
647 | cache->uses_fp = 0; | |
648 | cache->framesize = 0; | |
649 | for (i = 0; i < E_NUM_REGS; ++i) | |
650 | cache->saved_regs[i] = REG_UNAVAIL; | |
651 | ||
652 | return cache; | |
653 | } | |
654 | ||
655 | static struct xstormy16_frame_cache * | |
bd2b40ac | 656 | xstormy16_frame_cache (frame_info_ptr this_frame, void **this_cache) |
b6fcb393 | 657 | { |
e17a4113 | 658 | struct gdbarch *gdbarch = get_frame_arch (this_frame); |
b6fcb393 CV |
659 | struct xstormy16_frame_cache *cache; |
660 | CORE_ADDR current_pc; | |
661 | int i; | |
662 | ||
663 | if (*this_cache) | |
19ba03f4 | 664 | return (struct xstormy16_frame_cache *) *this_cache; |
b6fcb393 CV |
665 | |
666 | cache = xstormy16_alloc_frame_cache (); | |
667 | *this_cache = cache; | |
668 | ||
94afd7a6 | 669 | cache->base = get_frame_register_unsigned (this_frame, E_FP_REGNUM); |
b6fcb393 CV |
670 | if (cache->base == 0) |
671 | return cache; | |
672 | ||
94afd7a6 UW |
673 | cache->pc = get_frame_func (this_frame); |
674 | current_pc = get_frame_pc (this_frame); | |
b6fcb393 | 675 | if (cache->pc) |
e17a4113 UW |
676 | xstormy16_analyze_prologue (gdbarch, cache->pc, current_pc, |
677 | cache, this_frame); | |
b6fcb393 CV |
678 | |
679 | if (!cache->uses_fp) | |
94afd7a6 | 680 | cache->base = get_frame_register_unsigned (this_frame, E_SP_REGNUM); |
b6fcb393 CV |
681 | |
682 | cache->saved_sp = cache->base - cache->framesize; | |
683 | ||
684 | for (i = 0; i < E_NUM_REGS; ++i) | |
685 | if (cache->saved_regs[i] != REG_UNAVAIL) | |
686 | cache->saved_regs[i] += cache->saved_sp; | |
687 | ||
688 | return cache; | |
0c884e17 CV |
689 | } |
690 | ||
94afd7a6 | 691 | static struct value * |
bd2b40ac | 692 | xstormy16_frame_prev_register (frame_info_ptr this_frame, |
94afd7a6 | 693 | void **this_cache, int regnum) |
b6fcb393 | 694 | { |
94afd7a6 | 695 | struct xstormy16_frame_cache *cache = xstormy16_frame_cache (this_frame, |
dda83cd7 | 696 | this_cache); |
b6fcb393 CV |
697 | gdb_assert (regnum >= 0); |
698 | ||
699 | if (regnum == E_SP_REGNUM && cache->saved_sp) | |
94afd7a6 | 700 | return frame_unwind_got_constant (this_frame, regnum, cache->saved_sp); |
b6fcb393 CV |
701 | |
702 | if (regnum < E_NUM_REGS && cache->saved_regs[regnum] != REG_UNAVAIL) | |
94afd7a6 UW |
703 | return frame_unwind_got_memory (this_frame, regnum, |
704 | cache->saved_regs[regnum]); | |
b6fcb393 | 705 | |
94afd7a6 | 706 | return frame_unwind_got_register (this_frame, regnum, regnum); |
b6fcb393 CV |
707 | } |
708 | ||
709 | static void | |
bd2b40ac | 710 | xstormy16_frame_this_id (frame_info_ptr this_frame, void **this_cache, |
b6fcb393 CV |
711 | struct frame_id *this_id) |
712 | { | |
94afd7a6 | 713 | struct xstormy16_frame_cache *cache = xstormy16_frame_cache (this_frame, |
b6fcb393 CV |
714 | this_cache); |
715 | ||
716 | /* This marks the outermost frame. */ | |
717 | if (cache->base == 0) | |
718 | return; | |
719 | ||
720 | *this_id = frame_id_build (cache->saved_sp, cache->pc); | |
721 | } | |
722 | ||
723 | static CORE_ADDR | |
bd2b40ac | 724 | xstormy16_frame_base_address (frame_info_ptr this_frame, void **this_cache) |
b6fcb393 | 725 | { |
94afd7a6 | 726 | struct xstormy16_frame_cache *cache = xstormy16_frame_cache (this_frame, |
b6fcb393 CV |
727 | this_cache); |
728 | return cache->base; | |
729 | } | |
730 | ||
731 | static const struct frame_unwind xstormy16_frame_unwind = { | |
a154d838 | 732 | "xstormy16 prologue", |
b6fcb393 | 733 | NORMAL_FRAME, |
8fbca658 | 734 | default_frame_unwind_stop_reason, |
b6fcb393 | 735 | xstormy16_frame_this_id, |
94afd7a6 UW |
736 | xstormy16_frame_prev_register, |
737 | NULL, | |
738 | default_frame_sniffer | |
b6fcb393 CV |
739 | }; |
740 | ||
741 | static const struct frame_base xstormy16_frame_base = { | |
742 | &xstormy16_frame_unwind, | |
743 | xstormy16_frame_base_address, | |
744 | xstormy16_frame_base_address, | |
745 | xstormy16_frame_base_address | |
746 | }; | |
747 | ||
0c884e17 CV |
748 | /* Function: xstormy16_gdbarch_init |
749 | Initializer function for the xstormy16 gdbarch vector. | |
581e13c1 | 750 | Called by gdbarch. Sets up the gdbarch vector(s) for this target. */ |
0c884e17 CV |
751 | |
752 | static struct gdbarch * | |
753 | xstormy16_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches) | |
754 | { | |
0c884e17 CV |
755 | struct gdbarch *gdbarch; |
756 | ||
581e13c1 | 757 | /* find a candidate among the list of pre-declared architectures. */ |
0c884e17 CV |
758 | arches = gdbarch_list_lookup_by_info (arches, &info); |
759 | if (arches != NULL) | |
760 | return (arches->gdbarch); | |
761 | ||
b6fcb393 | 762 | gdbarch = gdbarch_alloc (&info, NULL); |
a5afb99f | 763 | |
0c884e17 | 764 | /* |
b6fcb393 | 765 | * Basic register fields and methods, datatype sizes and stuff. |
0c884e17 CV |
766 | */ |
767 | ||
768 | set_gdbarch_num_regs (gdbarch, E_NUM_REGS); | |
769 | set_gdbarch_num_pseudo_regs (gdbarch, 0); | |
770 | set_gdbarch_sp_regnum (gdbarch, E_SP_REGNUM); | |
0c884e17 CV |
771 | set_gdbarch_pc_regnum (gdbarch, E_PC_REGNUM); |
772 | set_gdbarch_register_name (gdbarch, xstormy16_register_name); | |
b6fcb393 | 773 | set_gdbarch_register_type (gdbarch, xstormy16_register_type); |
0c884e17 | 774 | |
71c08af0 | 775 | set_gdbarch_char_signed (gdbarch, 0); |
b6fcb393 | 776 | set_gdbarch_short_bit (gdbarch, 2 * TARGET_CHAR_BIT); |
0c884e17 | 777 | set_gdbarch_int_bit (gdbarch, 2 * TARGET_CHAR_BIT); |
b6fcb393 CV |
778 | set_gdbarch_long_bit (gdbarch, 4 * TARGET_CHAR_BIT); |
779 | set_gdbarch_long_long_bit (gdbarch, 8 * TARGET_CHAR_BIT); | |
780 | ||
53375380 PA |
781 | set_gdbarch_wchar_bit (gdbarch, 2 * TARGET_CHAR_BIT); |
782 | set_gdbarch_wchar_signed (gdbarch, 1); | |
783 | ||
b6fcb393 CV |
784 | set_gdbarch_float_bit (gdbarch, 4 * TARGET_CHAR_BIT); |
785 | set_gdbarch_double_bit (gdbarch, 8 * TARGET_CHAR_BIT); | |
786 | set_gdbarch_long_double_bit (gdbarch, 8 * TARGET_CHAR_BIT); | |
787 | ||
0c884e17 CV |
788 | set_gdbarch_ptr_bit (gdbarch, 2 * TARGET_CHAR_BIT); |
789 | set_gdbarch_addr_bit (gdbarch, 4 * TARGET_CHAR_BIT); | |
8da614df | 790 | set_gdbarch_dwarf2_addr_size (gdbarch, 4); |
0c884e17 CV |
791 | |
792 | set_gdbarch_address_to_pointer (gdbarch, xstormy16_address_to_pointer); | |
793 | set_gdbarch_pointer_to_address (gdbarch, xstormy16_pointer_to_address); | |
794 | ||
581e13c1 | 795 | /* Stack grows up. */ |
b6fcb393 | 796 | set_gdbarch_inner_than (gdbarch, core_addr_greaterthan); |
0c884e17 | 797 | |
b6fcb393 CV |
798 | /* |
799 | * Frame Info | |
800 | */ | |
b6fcb393 CV |
801 | set_gdbarch_frame_align (gdbarch, xstormy16_frame_align); |
802 | frame_base_set_default (gdbarch, &xstormy16_frame_base); | |
0c884e17 | 803 | |
b6fcb393 | 804 | set_gdbarch_skip_prologue (gdbarch, xstormy16_skip_prologue); |
c9cf6e20 MG |
805 | set_gdbarch_stack_frame_destroyed_p (gdbarch, |
806 | xstormy16_stack_frame_destroyed_p); | |
b6fcb393 CV |
807 | |
808 | /* These values and methods are used when gdb calls a target function. */ | |
809 | set_gdbarch_push_dummy_call (gdbarch, xstormy16_push_dummy_call); | |
04180708 YQ |
810 | set_gdbarch_breakpoint_kind_from_pc (gdbarch, |
811 | xstormy16_breakpoint::kind_from_pc); | |
812 | set_gdbarch_sw_breakpoint_from_kind (gdbarch, | |
813 | xstormy16_breakpoint::bp_from_kind); | |
b6fcb393 CV |
814 | set_gdbarch_return_value (gdbarch, xstormy16_return_value); |
815 | ||
816 | set_gdbarch_skip_trampoline_code (gdbarch, xstormy16_skip_trampoline_code); | |
0c884e17 | 817 | |
b6fcb393 CV |
818 | gdbarch_init_osabi (info, gdbarch); |
819 | ||
94afd7a6 UW |
820 | dwarf2_append_unwinders (gdbarch); |
821 | frame_unwind_append_unwinder (gdbarch, &xstormy16_frame_unwind); | |
b6fcb393 | 822 | |
0c884e17 CV |
823 | return gdbarch; |
824 | } | |
825 | ||
826 | /* Function: _initialize_xstormy16_tdep | |
827 | Initializer function for the Sanyo Xstormy16a module. | |
581e13c1 | 828 | Called by gdb at start-up. */ |
0c884e17 | 829 | |
6c265988 | 830 | void _initialize_xstormy16_tdep (); |
0c884e17 | 831 | void |
6c265988 | 832 | _initialize_xstormy16_tdep () |
0c884e17 | 833 | { |
ec29a63c | 834 | gdbarch_register (bfd_arch_xstormy16, xstormy16_gdbarch_init); |
0c884e17 | 835 | } |