Commit | Line | Data |
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0c884e17 | 1 | /* Target-dependent code for the Sanyo Xstormy16a (LC590000) processor. |
f4f9705a | 2 | |
32d0add0 | 3 | Copyright (C) 2001-2015 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 | 32 | #include "arch-utils.h" |
b6fcb393 | 33 | #include "floatformat.h" |
0c884e17 | 34 | #include "regcache.h" |
b6fcb393 CV |
35 | #include "doublest.h" |
36 | #include "osabi.h" | |
0c884e17 | 37 | #include "objfiles.h" |
0c884e17 CV |
38 | |
39 | enum gdb_regnum | |
40 | { | |
41 | /* Xstormy16 has 16 general purpose registers (R0-R15) plus PC. | |
42 | Functions will return their values in register R2-R7 as they fit. | |
43 | Otherwise a hidden pointer to an big enough area is given as argument | |
581e13c1 | 44 | to the function in r2. Further arguments are beginning in r3 then. |
0c884e17 CV |
45 | R13 is used as frame pointer when GCC compiles w/o optimization |
46 | R14 is used as "PSW", displaying the CPU status. | |
581e13c1 | 47 | R15 is used implicitely as stack pointer. */ |
0c884e17 CV |
48 | E_R0_REGNUM, |
49 | E_R1_REGNUM, | |
50 | E_R2_REGNUM, E_1ST_ARG_REGNUM = E_R2_REGNUM, E_PTR_RET_REGNUM = E_R2_REGNUM, | |
51 | E_R3_REGNUM, | |
52 | E_R4_REGNUM, | |
53 | E_R5_REGNUM, | |
54 | E_R6_REGNUM, | |
55 | E_R7_REGNUM, E_LST_ARG_REGNUM = E_R7_REGNUM, | |
56 | E_R8_REGNUM, | |
57 | E_R9_REGNUM, | |
58 | E_R10_REGNUM, | |
59 | E_R11_REGNUM, | |
60 | E_R12_REGNUM, | |
61 | E_R13_REGNUM, E_FP_REGNUM = E_R13_REGNUM, | |
62 | E_R14_REGNUM, E_PSW_REGNUM = E_R14_REGNUM, | |
63 | E_R15_REGNUM, E_SP_REGNUM = E_R15_REGNUM, | |
64 | E_PC_REGNUM, | |
65 | E_NUM_REGS | |
66 | }; | |
67 | ||
b6fcb393 CV |
68 | /* Use an invalid address value as 'not available' marker. */ |
69 | enum { REG_UNAVAIL = (CORE_ADDR) -1 }; | |
70 | ||
71 | struct xstormy16_frame_cache | |
72 | { | |
73 | /* Base address. */ | |
74 | CORE_ADDR base; | |
75 | CORE_ADDR pc; | |
76 | LONGEST framesize; | |
77 | int uses_fp; | |
78 | CORE_ADDR saved_regs[E_NUM_REGS]; | |
79 | CORE_ADDR saved_sp; | |
80 | }; | |
81 | ||
581e13c1 | 82 | /* Size of instructions, registers, etc. */ |
0c884e17 CV |
83 | enum |
84 | { | |
85 | xstormy16_inst_size = 2, | |
86 | xstormy16_reg_size = 2, | |
87 | xstormy16_pc_size = 4 | |
88 | }; | |
89 | ||
581e13c1 | 90 | /* Size of return datatype which fits into the remaining return registers. */ |
0c884e17 CV |
91 | #define E_MAX_RETTYPE_SIZE(regnum) ((E_LST_ARG_REGNUM - (regnum) + 1) \ |
92 | * xstormy16_reg_size) | |
93 | ||
581e13c1 | 94 | /* Size of return datatype which fits into all return registers. */ |
0c884e17 CV |
95 | enum |
96 | { | |
97 | E_MAX_RETTYPE_SIZE_IN_REGS = E_MAX_RETTYPE_SIZE (E_R2_REGNUM) | |
98 | }; | |
99 | ||
0c884e17 | 100 | /* Function: xstormy16_register_name |
b6fcb393 | 101 | Returns the name of the standard Xstormy16 register N. */ |
0c884e17 | 102 | |
fa88f677 | 103 | static const char * |
d93859e2 | 104 | xstormy16_register_name (struct gdbarch *gdbarch, int regnum) |
0c884e17 CV |
105 | { |
106 | static char *register_names[] = { | |
107 | "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", | |
108 | "r8", "r9", "r10", "r11", "r12", "r13", | |
109 | "psw", "sp", "pc" | |
110 | }; | |
111 | ||
b6fcb393 | 112 | if (regnum < 0 || regnum >= E_NUM_REGS) |
0c884e17 | 113 | internal_error (__FILE__, __LINE__, |
e2e0b3e5 | 114 | _("xstormy16_register_name: illegal register number %d"), |
0c884e17 CV |
115 | regnum); |
116 | else | |
117 | return register_names[regnum]; | |
118 | ||
119 | } | |
120 | ||
0c884e17 | 121 | static struct type * |
b6fcb393 | 122 | xstormy16_register_type (struct gdbarch *gdbarch, int regnum) |
0c884e17 | 123 | { |
b6fcb393 | 124 | if (regnum == E_PC_REGNUM) |
df4df182 | 125 | return builtin_type (gdbarch)->builtin_uint32; |
0c884e17 | 126 | else |
df4df182 | 127 | return builtin_type (gdbarch)->builtin_uint16; |
0c884e17 CV |
128 | } |
129 | ||
0c884e17 CV |
130 | /* Function: xstormy16_type_is_scalar |
131 | Makes the decision if a given type is a scalar types. Scalar | |
b6fcb393 | 132 | types are returned in the registers r2-r7 as they fit. */ |
0c884e17 CV |
133 | |
134 | static int | |
135 | xstormy16_type_is_scalar (struct type *t) | |
136 | { | |
137 | return (TYPE_CODE(t) != TYPE_CODE_STRUCT | |
138 | && TYPE_CODE(t) != TYPE_CODE_UNION | |
139 | && TYPE_CODE(t) != TYPE_CODE_ARRAY); | |
140 | } | |
141 | ||
b6fcb393 CV |
142 | /* Function: xstormy16_use_struct_convention |
143 | Returns non-zero if the given struct type will be returned using | |
144 | a special convention, rather than the normal function return method. | |
145 | 7sed in the contexts of the "return" command, and of | |
146 | target function calls from the debugger. */ | |
147 | ||
148 | static int | |
149 | xstormy16_use_struct_convention (struct type *type) | |
150 | { | |
151 | return !xstormy16_type_is_scalar (type) | |
152 | || TYPE_LENGTH (type) > E_MAX_RETTYPE_SIZE_IN_REGS; | |
153 | } | |
154 | ||
0c884e17 | 155 | /* Function: xstormy16_extract_return_value |
b6fcb393 CV |
156 | Find a function's return value in the appropriate registers (in |
157 | regbuf), and copy it into valbuf. */ | |
0c884e17 CV |
158 | |
159 | static void | |
b6fcb393 | 160 | xstormy16_extract_return_value (struct type *type, struct regcache *regcache, |
948f8e3d | 161 | gdb_byte *valbuf) |
0c884e17 | 162 | { |
b6fcb393 CV |
163 | int len = TYPE_LENGTH (type); |
164 | int i, regnum = E_1ST_ARG_REGNUM; | |
0c884e17 | 165 | |
b6fcb393 | 166 | for (i = 0; i < len; i += xstormy16_reg_size) |
948f8e3d | 167 | regcache_raw_read (regcache, regnum++, valbuf + i); |
b6fcb393 CV |
168 | } |
169 | ||
170 | /* Function: xstormy16_store_return_value | |
171 | Copy the function return value from VALBUF into the | |
172 | proper location for a function return. | |
173 | Called only in the context of the "return" command. */ | |
174 | ||
175 | static void | |
176 | xstormy16_store_return_value (struct type *type, struct regcache *regcache, | |
948f8e3d | 177 | const gdb_byte *valbuf) |
b6fcb393 CV |
178 | { |
179 | if (TYPE_LENGTH (type) == 1) | |
180 | { | |
581e13c1 | 181 | /* Add leading zeros to the value. */ |
e362b510 | 182 | gdb_byte buf[xstormy16_reg_size]; |
b6fcb393 CV |
183 | memset (buf, 0, xstormy16_reg_size); |
184 | memcpy (buf, valbuf, 1); | |
185 | regcache_raw_write (regcache, E_1ST_ARG_REGNUM, buf); | |
0c884e17 CV |
186 | } |
187 | else | |
188 | { | |
b6fcb393 CV |
189 | int len = TYPE_LENGTH (type); |
190 | int i, regnum = E_1ST_ARG_REGNUM; | |
0c884e17 | 191 | |
b6fcb393 | 192 | for (i = 0; i < len; i += xstormy16_reg_size) |
948f8e3d | 193 | regcache_raw_write (regcache, regnum++, valbuf + i); |
0c884e17 CV |
194 | } |
195 | } | |
196 | ||
b6fcb393 | 197 | static enum return_value_convention |
6a3a010b | 198 | xstormy16_return_value (struct gdbarch *gdbarch, struct value *function, |
c055b101 | 199 | struct type *type, struct regcache *regcache, |
05c6a9a1 | 200 | gdb_byte *readbuf, const gdb_byte *writebuf) |
b6fcb393 CV |
201 | { |
202 | if (xstormy16_use_struct_convention (type)) | |
203 | return RETURN_VALUE_STRUCT_CONVENTION; | |
204 | if (writebuf) | |
205 | xstormy16_store_return_value (type, regcache, writebuf); | |
206 | else if (readbuf) | |
207 | xstormy16_extract_return_value (type, regcache, readbuf); | |
208 | return RETURN_VALUE_REGISTER_CONVENTION; | |
209 | } | |
210 | ||
211 | static CORE_ADDR | |
212 | xstormy16_frame_align (struct gdbarch *gdbarch, CORE_ADDR addr) | |
213 | { | |
214 | if (addr & 1) | |
215 | ++addr; | |
216 | return addr; | |
217 | } | |
218 | ||
219 | /* Function: xstormy16_push_dummy_call | |
0c884e17 CV |
220 | Setup the function arguments for GDB to call a function in the inferior. |
221 | Called only in the context of a target function call from the debugger. | |
b6fcb393 | 222 | Returns the value of the SP register after the args are pushed. */ |
0c884e17 CV |
223 | |
224 | static CORE_ADDR | |
b6fcb393 CV |
225 | xstormy16_push_dummy_call (struct gdbarch *gdbarch, |
226 | struct value *function, | |
227 | struct regcache *regcache, | |
228 | CORE_ADDR bp_addr, int nargs, | |
229 | struct value **args, | |
230 | CORE_ADDR sp, int struct_return, | |
231 | CORE_ADDR struct_addr) | |
0c884e17 | 232 | { |
e17a4113 | 233 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
0c884e17 CV |
234 | CORE_ADDR stack_dest = sp; |
235 | int argreg = E_1ST_ARG_REGNUM; | |
236 | int i, j; | |
237 | int typelen, slacklen; | |
05c6a9a1 | 238 | const gdb_byte *val; |
e362b510 | 239 | gdb_byte buf[xstormy16_pc_size]; |
0c884e17 CV |
240 | |
241 | /* If struct_return is true, then the struct return address will | |
242 | consume one argument-passing register. */ | |
243 | if (struct_return) | |
b6fcb393 CV |
244 | { |
245 | regcache_cooked_write_unsigned (regcache, E_PTR_RET_REGNUM, struct_addr); | |
246 | argreg++; | |
247 | } | |
0c884e17 | 248 | |
581e13c1 | 249 | /* Arguments are passed in R2-R7 as they fit. If an argument doesn't |
0c884e17 CV |
250 | fit in the remaining registers we're switching over to the stack. |
251 | No argument is put on stack partially and as soon as we switched | |
252 | over to stack no further argument is put in a register even if it | |
b6fcb393 | 253 | would fit in the remaining unused registers. */ |
0c884e17 CV |
254 | for (i = 0; i < nargs && argreg <= E_LST_ARG_REGNUM; i++) |
255 | { | |
4754a64e | 256 | typelen = TYPE_LENGTH (value_enclosing_type (args[i])); |
0c884e17 CV |
257 | if (typelen > E_MAX_RETTYPE_SIZE (argreg)) |
258 | break; | |
259 | ||
581e13c1 | 260 | /* Put argument into registers wordwise. */ |
0fd88904 | 261 | val = value_contents (args[i]); |
0c884e17 | 262 | for (j = 0; j < typelen; j += xstormy16_reg_size) |
1c6e1b0d PM |
263 | { |
264 | ULONGEST regval; | |
265 | int size = (typelen - j == 1) ? 1 : xstormy16_reg_size; | |
266 | ||
267 | regval = extract_unsigned_integer (val + j, size, byte_order); | |
268 | regcache_cooked_write_unsigned (regcache, argreg++, regval); | |
269 | } | |
0c884e17 CV |
270 | } |
271 | ||
272 | /* Align SP */ | |
b6fcb393 | 273 | stack_dest = xstormy16_frame_align (gdbarch, stack_dest); |
0c884e17 CV |
274 | |
275 | /* Loop backwards through remaining arguments and push them on the stack, | |
b6fcb393 | 276 | wordaligned. */ |
0c884e17 CV |
277 | for (j = nargs - 1; j >= i; j--) |
278 | { | |
948f8e3d | 279 | gdb_byte *val; |
ecfb0d68 SP |
280 | struct cleanup *back_to; |
281 | const gdb_byte *bytes = value_contents (args[j]); | |
05c6a9a1 | 282 | |
4754a64e | 283 | typelen = TYPE_LENGTH (value_enclosing_type (args[j])); |
0c884e17 | 284 | slacklen = typelen & 1; |
ecfb0d68 SP |
285 | val = xmalloc (typelen + slacklen); |
286 | back_to = make_cleanup (xfree, val); | |
287 | memcpy (val, bytes, 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; | |
ecfb0d68 | 293 | do_cleanups (back_to); |
0c884e17 CV |
294 | } |
295 | ||
e17a4113 | 296 | store_unsigned_integer (buf, xstormy16_pc_size, byte_order, bp_addr); |
b6fcb393 CV |
297 | write_memory (stack_dest, buf, xstormy16_pc_size); |
298 | stack_dest += xstormy16_pc_size; | |
0c884e17 | 299 | |
b6fcb393 CV |
300 | /* Update stack pointer. */ |
301 | regcache_cooked_write_unsigned (regcache, E_SP_REGNUM, stack_dest); | |
0c884e17 | 302 | |
b6fcb393 CV |
303 | /* Return the new stack pointer minus the return address slot since |
304 | that's what DWARF2/GCC uses as the frame's CFA. */ | |
305 | return stack_dest - xstormy16_pc_size; | |
0c884e17 CV |
306 | } |
307 | ||
308 | /* Function: xstormy16_scan_prologue | |
309 | Decode the instructions within the given address range. | |
310 | Decide when we must have reached the end of the function prologue. | |
311 | If a frame_info pointer is provided, fill in its saved_regs etc. | |
312 | ||
b6fcb393 | 313 | Returns the address of the first instruction after the prologue. */ |
0c884e17 CV |
314 | |
315 | static CORE_ADDR | |
e17a4113 UW |
316 | xstormy16_analyze_prologue (struct gdbarch *gdbarch, |
317 | CORE_ADDR start_addr, CORE_ADDR end_addr, | |
b6fcb393 | 318 | struct xstormy16_frame_cache *cache, |
94afd7a6 | 319 | struct frame_info *this_frame) |
0c884e17 | 320 | { |
e17a4113 | 321 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
0c884e17 CV |
322 | CORE_ADDR next_addr; |
323 | ULONGEST inst, inst2; | |
324 | LONGEST offset; | |
325 | int regnum; | |
326 | ||
581e13c1 | 327 | /* Initialize framesize with size of PC put on stack by CALLF inst. */ |
b6fcb393 CV |
328 | cache->saved_regs[E_PC_REGNUM] = 0; |
329 | cache->framesize = xstormy16_pc_size; | |
330 | ||
331 | if (start_addr >= end_addr) | |
332 | return end_addr; | |
333 | ||
0c884e17 CV |
334 | for (next_addr = start_addr; |
335 | next_addr < end_addr; next_addr += xstormy16_inst_size) | |
336 | { | |
e17a4113 UW |
337 | inst = read_memory_unsigned_integer (next_addr, |
338 | xstormy16_inst_size, byte_order); | |
0c884e17 | 339 | inst2 = read_memory_unsigned_integer (next_addr + xstormy16_inst_size, |
e17a4113 | 340 | xstormy16_inst_size, byte_order); |
0c884e17 CV |
341 | |
342 | if (inst >= 0x0082 && inst <= 0x008d) /* push r2 .. push r13 */ | |
343 | { | |
b6fcb393 CV |
344 | regnum = inst & 0x000f; |
345 | cache->saved_regs[regnum] = cache->framesize; | |
346 | cache->framesize += xstormy16_reg_size; | |
0c884e17 CV |
347 | } |
348 | ||
581e13c1 MS |
349 | /* Optional stack allocation for args and local vars <= 4 byte. */ |
350 | else if (inst == 0x301f || inst == 0x303f) /* inc r15, #0x1/#0x3 */ | |
0c884e17 | 351 | { |
b6fcb393 | 352 | cache->framesize += ((inst & 0x0030) >> 4) + 1; |
0c884e17 CV |
353 | } |
354 | ||
355 | /* optional stack allocation for args and local vars > 4 && < 16 byte */ | |
356 | else if ((inst & 0xff0f) == 0x510f) /* 51Hf add r15, #0xH */ | |
357 | { | |
b6fcb393 | 358 | cache->framesize += (inst & 0x00f0) >> 4; |
0c884e17 CV |
359 | } |
360 | ||
581e13c1 MS |
361 | /* Optional stack allocation for args and local vars >= 16 byte. */ |
362 | else if (inst == 0x314f && inst2 >= 0x0010) /* 314f HHHH add r15, #0xH */ | |
0c884e17 | 363 | { |
b6fcb393 | 364 | cache->framesize += inst2; |
0c884e17 CV |
365 | next_addr += xstormy16_inst_size; |
366 | } | |
367 | ||
368 | else if (inst == 0x46fd) /* mov r13, r15 */ | |
369 | { | |
b6fcb393 | 370 | cache->uses_fp = 1; |
0c884e17 CV |
371 | } |
372 | ||
581e13c1 MS |
373 | /* optional copying of args in r2-r7 to r10-r13. */ |
374 | /* Probably only in optimized case but legal action for prologue. */ | |
0c884e17 CV |
375 | else if ((inst & 0xff00) == 0x4600 /* 46SD mov rD, rS */ |
376 | && (inst & 0x00f0) >= 0x0020 && (inst & 0x00f0) <= 0x0070 | |
3e3286a2 | 377 | && (inst & 0x000f) >= 0x000a && (inst & 0x000f) <= 0x000d) |
0c884e17 CV |
378 | ; |
379 | ||
581e13c1 MS |
380 | /* Optional copying of args in r2-r7 to stack. */ |
381 | /* 72DS HHHH mov.b (rD, 0xHHHH), r(S-8) | |
382 | (bit3 always 1, bit2-0 = reg) */ | |
0c884e17 CV |
383 | /* 73DS HHHH mov.w (rD, 0xHHHH), r(S-8) */ |
384 | else if ((inst & 0xfed8) == 0x72d8 && (inst & 0x0007) >= 2) | |
385 | { | |
b6fcb393 CV |
386 | regnum = inst & 0x0007; |
387 | /* Only 12 of 16 bits of the argument are used for the | |
581e13c1 | 388 | signed offset. */ |
b6fcb393 CV |
389 | offset = (LONGEST) (inst2 & 0x0fff); |
390 | if (offset & 0x0800) | |
391 | offset -= 0x1000; | |
392 | ||
393 | cache->saved_regs[regnum] = cache->framesize + offset; | |
0c884e17 CV |
394 | next_addr += xstormy16_inst_size; |
395 | } | |
0c884e17 | 396 | |
581e13c1 | 397 | else /* Not a prologue instruction. */ |
0c884e17 CV |
398 | break; |
399 | } | |
400 | ||
0c884e17 CV |
401 | return next_addr; |
402 | } | |
403 | ||
404 | /* Function: xstormy16_skip_prologue | |
405 | If the input address is in a function prologue, | |
406 | returns the address of the end of the prologue; | |
407 | else returns the input address. | |
408 | ||
409 | Note: the input address is likely to be the function start, | |
410 | since this function is mainly used for advancing a breakpoint | |
411 | to the first line, or stepping to the first line when we have | |
412 | stepped into a function call. */ | |
413 | ||
414 | static CORE_ADDR | |
6093d2eb | 415 | xstormy16_skip_prologue (struct gdbarch *gdbarch, CORE_ADDR pc) |
0c884e17 CV |
416 | { |
417 | CORE_ADDR func_addr = 0, func_end = 0; | |
2c02bd72 | 418 | const char *func_name; |
0c884e17 CV |
419 | |
420 | if (find_pc_partial_function (pc, &func_name, &func_addr, &func_end)) | |
421 | { | |
422 | struct symtab_and_line sal; | |
423 | struct symbol *sym; | |
b6fcb393 | 424 | struct xstormy16_frame_cache cache; |
57fdbbbe | 425 | CORE_ADDR plg_end; |
0c884e17 | 426 | |
28fe5f6a KB |
427 | memset (&cache, 0, sizeof cache); |
428 | ||
581e13c1 | 429 | /* Don't trust line number debug info in frameless functions. */ |
e17a4113 UW |
430 | plg_end = xstormy16_analyze_prologue (gdbarch, func_addr, func_end, |
431 | &cache, NULL); | |
b6fcb393 | 432 | if (!cache.uses_fp) |
211a4f69 CV |
433 | return plg_end; |
434 | ||
0c884e17 | 435 | /* Found a function. */ |
2570f2b7 | 436 | sym = lookup_symbol (func_name, NULL, VAR_DOMAIN, NULL); |
581e13c1 | 437 | /* Don't use line number debug info for assembly source files. */ |
0c884e17 CV |
438 | if (sym && SYMBOL_LANGUAGE (sym) != language_asm) |
439 | { | |
0c884e17 CV |
440 | sal = find_pc_line (func_addr, 0); |
441 | if (sal.end && sal.end < func_end) | |
442 | { | |
443 | /* Found a line number, use it as end of prologue. */ | |
444 | return sal.end; | |
445 | } | |
446 | } | |
581e13c1 | 447 | /* No useable line symbol. Use result of prologue parsing method. */ |
211a4f69 | 448 | return plg_end; |
0c884e17 CV |
449 | } |
450 | ||
581e13c1 | 451 | /* No function symbol -- just return the PC. */ |
0c884e17 CV |
452 | |
453 | return (CORE_ADDR) pc; | |
454 | } | |
455 | ||
456 | /* The epilogue is defined here as the area at the end of a function, | |
457 | either on the `ret' instruction itself or after an instruction which | |
581e13c1 | 458 | destroys the function's stack frame. */ |
0c884e17 CV |
459 | static int |
460 | xstormy16_in_function_epilogue_p (struct gdbarch *gdbarch, CORE_ADDR pc) | |
461 | { | |
e17a4113 | 462 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
b6fcb393 | 463 | CORE_ADDR func_addr = 0, func_end = 0; |
0c884e17 CV |
464 | |
465 | if (find_pc_partial_function (pc, NULL, &func_addr, &func_end)) | |
466 | { | |
467 | ULONGEST inst, inst2; | |
468 | CORE_ADDR addr = func_end - xstormy16_inst_size; | |
469 | ||
581e13c1 | 470 | /* The Xstormy16 epilogue is max. 14 bytes long. */ |
0c884e17 CV |
471 | if (pc < func_end - 7 * xstormy16_inst_size) |
472 | return 0; | |
473 | ||
474 | /* Check if we're on a `ret' instruction. Otherwise it's | |
581e13c1 | 475 | too dangerous to proceed. */ |
e17a4113 UW |
476 | inst = read_memory_unsigned_integer (addr, |
477 | xstormy16_inst_size, byte_order); | |
0c884e17 CV |
478 | if (inst != 0x0003) |
479 | return 0; | |
480 | ||
481 | while ((addr -= xstormy16_inst_size) >= func_addr) | |
482 | { | |
e17a4113 | 483 | inst = read_memory_unsigned_integer (addr, |
581e13c1 MS |
484 | xstormy16_inst_size, |
485 | byte_order); | |
0c884e17 CV |
486 | if (inst >= 0x009a && inst <= 0x009d) /* pop r10...r13 */ |
487 | continue; | |
488 | if (inst == 0x305f || inst == 0x307f) /* dec r15, #0x1/#0x3 */ | |
489 | break; | |
490 | inst2 = read_memory_unsigned_integer (addr - xstormy16_inst_size, | |
581e13c1 MS |
491 | xstormy16_inst_size, |
492 | byte_order); | |
493 | if (inst2 == 0x314f && inst >= 0x8000) /* add r15, neg. value */ | |
0c884e17 CV |
494 | { |
495 | addr -= xstormy16_inst_size; | |
496 | break; | |
497 | } | |
498 | return 0; | |
499 | } | |
500 | if (pc > addr) | |
501 | return 1; | |
502 | } | |
503 | return 0; | |
504 | } | |
505 | ||
44d100c3 | 506 | static const unsigned char * |
67d57894 MD |
507 | xstormy16_breakpoint_from_pc (struct gdbarch *gdbarch, CORE_ADDR *pcptr, |
508 | int *lenptr) | |
0c884e17 CV |
509 | { |
510 | static unsigned char breakpoint[] = { 0x06, 0x0 }; | |
511 | *lenptr = sizeof (breakpoint); | |
512 | return breakpoint; | |
513 | } | |
514 | ||
515 | /* Given a pointer to a jump table entry, return the address | |
581e13c1 | 516 | of the function it jumps to. Return 0 if not found. */ |
0c884e17 | 517 | static CORE_ADDR |
e17a4113 | 518 | xstormy16_resolve_jmp_table_entry (struct gdbarch *gdbarch, CORE_ADDR faddr) |
0c884e17 | 519 | { |
e17a4113 | 520 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
0c884e17 CV |
521 | struct obj_section *faddr_sect = find_pc_section (faddr); |
522 | ||
523 | if (faddr_sect) | |
524 | { | |
525 | LONGEST inst, inst2, addr; | |
e362b510 | 526 | gdb_byte buf[2 * xstormy16_inst_size]; |
0c884e17 | 527 | |
581e13c1 | 528 | /* Return faddr if it's not pointing into the jump table. */ |
0c884e17 CV |
529 | if (strcmp (faddr_sect->the_bfd_section->name, ".plt")) |
530 | return faddr; | |
531 | ||
532 | if (!target_read_memory (faddr, buf, sizeof buf)) | |
533 | { | |
e17a4113 UW |
534 | inst = extract_unsigned_integer (buf, |
535 | xstormy16_inst_size, byte_order); | |
0c884e17 | 536 | inst2 = extract_unsigned_integer (buf + xstormy16_inst_size, |
e17a4113 | 537 | xstormy16_inst_size, byte_order); |
0c884e17 CV |
538 | addr = inst2 << 8 | (inst & 0xff); |
539 | return addr; | |
540 | } | |
541 | } | |
542 | return 0; | |
543 | } | |
544 | ||
545 | /* Given a function's address, attempt to find (and return) the | |
546 | address of the corresponding jump table entry. Return 0 if | |
581e13c1 | 547 | not found. */ |
0c884e17 | 548 | static CORE_ADDR |
e17a4113 | 549 | xstormy16_find_jmp_table_entry (struct gdbarch *gdbarch, CORE_ADDR faddr) |
0c884e17 | 550 | { |
e17a4113 | 551 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
0c884e17 CV |
552 | struct obj_section *faddr_sect = find_pc_section (faddr); |
553 | ||
554 | if (faddr_sect) | |
555 | { | |
556 | struct obj_section *osect; | |
557 | ||
581e13c1 | 558 | /* Return faddr if it's already a pointer to a jump table entry. */ |
0c884e17 CV |
559 | if (!strcmp (faddr_sect->the_bfd_section->name, ".plt")) |
560 | return faddr; | |
561 | ||
562 | ALL_OBJFILE_OSECTIONS (faddr_sect->objfile, osect) | |
563 | { | |
564 | if (!strcmp (osect->the_bfd_section->name, ".plt")) | |
565 | break; | |
566 | } | |
567 | ||
568 | if (osect < faddr_sect->objfile->sections_end) | |
569 | { | |
aded6f54 PA |
570 | CORE_ADDR addr, endaddr; |
571 | ||
572 | addr = obj_section_addr (osect); | |
573 | endaddr = obj_section_endaddr (osect); | |
574 | ||
575 | for (; addr < endaddr; addr += 2 * xstormy16_inst_size) | |
0c884e17 | 576 | { |
0c884e17 | 577 | LONGEST inst, inst2, faddr2; |
e362b510 | 578 | gdb_byte buf[2 * xstormy16_inst_size]; |
0c884e17 CV |
579 | |
580 | if (target_read_memory (addr, buf, sizeof buf)) | |
581 | return 0; | |
e17a4113 | 582 | inst = extract_unsigned_integer (buf, |
581e13c1 MS |
583 | xstormy16_inst_size, |
584 | byte_order); | |
0c884e17 | 585 | inst2 = extract_unsigned_integer (buf + xstormy16_inst_size, |
581e13c1 MS |
586 | xstormy16_inst_size, |
587 | byte_order); | |
0c884e17 CV |
588 | faddr2 = inst2 << 8 | (inst & 0xff); |
589 | if (faddr == faddr2) | |
590 | return addr; | |
591 | } | |
592 | } | |
593 | } | |
594 | return 0; | |
595 | } | |
596 | ||
597 | static CORE_ADDR | |
52f729a7 | 598 | xstormy16_skip_trampoline_code (struct frame_info *frame, CORE_ADDR pc) |
0c884e17 | 599 | { |
e17a4113 UW |
600 | struct gdbarch *gdbarch = get_frame_arch (frame); |
601 | CORE_ADDR tmp = xstormy16_resolve_jmp_table_entry (gdbarch, pc); | |
0c884e17 CV |
602 | |
603 | if (tmp && tmp != pc) | |
604 | return tmp; | |
605 | return 0; | |
606 | } | |
607 | ||
b6fcb393 CV |
608 | /* Function pointers are 16 bit. The address space is 24 bit, using |
609 | 32 bit addresses. Pointers to functions on the XStormy16 are implemented | |
610 | by using 16 bit pointers, which are either direct pointers in case the | |
611 | function begins below 0x10000, or indirect pointers into a jump table. | |
612 | The next two functions convert 16 bit pointers into 24 (32) bit addresses | |
613 | and vice versa. */ | |
614 | ||
0c884e17 | 615 | static CORE_ADDR |
9898f801 UW |
616 | xstormy16_pointer_to_address (struct gdbarch *gdbarch, |
617 | struct type *type, const gdb_byte *buf) | |
0c884e17 | 618 | { |
e17a4113 | 619 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
0c884e17 | 620 | enum type_code target = TYPE_CODE (TYPE_TARGET_TYPE (type)); |
e17a4113 UW |
621 | CORE_ADDR addr |
622 | = extract_unsigned_integer (buf, TYPE_LENGTH (type), byte_order); | |
0c884e17 CV |
623 | |
624 | if (target == TYPE_CODE_FUNC || target == TYPE_CODE_METHOD) | |
625 | { | |
e17a4113 | 626 | CORE_ADDR addr2 = xstormy16_resolve_jmp_table_entry (gdbarch, addr); |
0c884e17 CV |
627 | if (addr2) |
628 | addr = addr2; | |
629 | } | |
630 | ||
631 | return addr; | |
632 | } | |
633 | ||
634 | static void | |
9898f801 UW |
635 | xstormy16_address_to_pointer (struct gdbarch *gdbarch, |
636 | struct type *type, gdb_byte *buf, CORE_ADDR addr) | |
0c884e17 | 637 | { |
e17a4113 | 638 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
0c884e17 CV |
639 | enum type_code target = TYPE_CODE (TYPE_TARGET_TYPE (type)); |
640 | ||
641 | if (target == TYPE_CODE_FUNC || target == TYPE_CODE_METHOD) | |
642 | { | |
e17a4113 | 643 | CORE_ADDR addr2 = xstormy16_find_jmp_table_entry (gdbarch, addr); |
0c884e17 CV |
644 | if (addr2) |
645 | addr = addr2; | |
646 | } | |
e17a4113 | 647 | store_unsigned_integer (buf, TYPE_LENGTH (type), byte_order, addr); |
0c884e17 CV |
648 | } |
649 | ||
b6fcb393 CV |
650 | static struct xstormy16_frame_cache * |
651 | xstormy16_alloc_frame_cache (void) | |
0c884e17 | 652 | { |
b6fcb393 CV |
653 | struct xstormy16_frame_cache *cache; |
654 | int i; | |
655 | ||
656 | cache = FRAME_OBSTACK_ZALLOC (struct xstormy16_frame_cache); | |
657 | ||
658 | cache->base = 0; | |
659 | cache->saved_sp = 0; | |
660 | cache->pc = 0; | |
661 | cache->uses_fp = 0; | |
662 | cache->framesize = 0; | |
663 | for (i = 0; i < E_NUM_REGS; ++i) | |
664 | cache->saved_regs[i] = REG_UNAVAIL; | |
665 | ||
666 | return cache; | |
667 | } | |
668 | ||
669 | static struct xstormy16_frame_cache * | |
94afd7a6 | 670 | xstormy16_frame_cache (struct frame_info *this_frame, void **this_cache) |
b6fcb393 | 671 | { |
e17a4113 | 672 | struct gdbarch *gdbarch = get_frame_arch (this_frame); |
b6fcb393 CV |
673 | struct xstormy16_frame_cache *cache; |
674 | CORE_ADDR current_pc; | |
675 | int i; | |
676 | ||
677 | if (*this_cache) | |
678 | return *this_cache; | |
679 | ||
680 | cache = xstormy16_alloc_frame_cache (); | |
681 | *this_cache = cache; | |
682 | ||
94afd7a6 | 683 | cache->base = get_frame_register_unsigned (this_frame, E_FP_REGNUM); |
b6fcb393 CV |
684 | if (cache->base == 0) |
685 | return cache; | |
686 | ||
94afd7a6 UW |
687 | cache->pc = get_frame_func (this_frame); |
688 | current_pc = get_frame_pc (this_frame); | |
b6fcb393 | 689 | if (cache->pc) |
e17a4113 UW |
690 | xstormy16_analyze_prologue (gdbarch, cache->pc, current_pc, |
691 | cache, this_frame); | |
b6fcb393 CV |
692 | |
693 | if (!cache->uses_fp) | |
94afd7a6 | 694 | cache->base = get_frame_register_unsigned (this_frame, E_SP_REGNUM); |
b6fcb393 CV |
695 | |
696 | cache->saved_sp = cache->base - cache->framesize; | |
697 | ||
698 | for (i = 0; i < E_NUM_REGS; ++i) | |
699 | if (cache->saved_regs[i] != REG_UNAVAIL) | |
700 | cache->saved_regs[i] += cache->saved_sp; | |
701 | ||
702 | return cache; | |
0c884e17 CV |
703 | } |
704 | ||
94afd7a6 UW |
705 | static struct value * |
706 | xstormy16_frame_prev_register (struct frame_info *this_frame, | |
707 | void **this_cache, int regnum) | |
b6fcb393 | 708 | { |
94afd7a6 | 709 | struct xstormy16_frame_cache *cache = xstormy16_frame_cache (this_frame, |
b6fcb393 CV |
710 | this_cache); |
711 | gdb_assert (regnum >= 0); | |
712 | ||
713 | if (regnum == E_SP_REGNUM && cache->saved_sp) | |
94afd7a6 | 714 | return frame_unwind_got_constant (this_frame, regnum, cache->saved_sp); |
b6fcb393 CV |
715 | |
716 | if (regnum < E_NUM_REGS && cache->saved_regs[regnum] != REG_UNAVAIL) | |
94afd7a6 UW |
717 | return frame_unwind_got_memory (this_frame, regnum, |
718 | cache->saved_regs[regnum]); | |
b6fcb393 | 719 | |
94afd7a6 | 720 | return frame_unwind_got_register (this_frame, regnum, regnum); |
b6fcb393 CV |
721 | } |
722 | ||
723 | static void | |
94afd7a6 | 724 | xstormy16_frame_this_id (struct frame_info *this_frame, void **this_cache, |
b6fcb393 CV |
725 | struct frame_id *this_id) |
726 | { | |
94afd7a6 | 727 | struct xstormy16_frame_cache *cache = xstormy16_frame_cache (this_frame, |
b6fcb393 CV |
728 | this_cache); |
729 | ||
730 | /* This marks the outermost frame. */ | |
731 | if (cache->base == 0) | |
732 | return; | |
733 | ||
734 | *this_id = frame_id_build (cache->saved_sp, cache->pc); | |
735 | } | |
736 | ||
737 | static CORE_ADDR | |
94afd7a6 | 738 | xstormy16_frame_base_address (struct frame_info *this_frame, void **this_cache) |
b6fcb393 | 739 | { |
94afd7a6 | 740 | struct xstormy16_frame_cache *cache = xstormy16_frame_cache (this_frame, |
b6fcb393 CV |
741 | this_cache); |
742 | return cache->base; | |
743 | } | |
744 | ||
745 | static const struct frame_unwind xstormy16_frame_unwind = { | |
746 | NORMAL_FRAME, | |
8fbca658 | 747 | default_frame_unwind_stop_reason, |
b6fcb393 | 748 | xstormy16_frame_this_id, |
94afd7a6 UW |
749 | xstormy16_frame_prev_register, |
750 | NULL, | |
751 | default_frame_sniffer | |
b6fcb393 CV |
752 | }; |
753 | ||
754 | static const struct frame_base xstormy16_frame_base = { | |
755 | &xstormy16_frame_unwind, | |
756 | xstormy16_frame_base_address, | |
757 | xstormy16_frame_base_address, | |
758 | xstormy16_frame_base_address | |
759 | }; | |
760 | ||
b6fcb393 CV |
761 | static CORE_ADDR |
762 | xstormy16_unwind_sp (struct gdbarch *gdbarch, struct frame_info *next_frame) | |
763 | { | |
764 | return frame_unwind_register_unsigned (next_frame, E_SP_REGNUM); | |
765 | } | |
766 | ||
767 | static CORE_ADDR | |
768 | xstormy16_unwind_pc (struct gdbarch *gdbarch, struct frame_info *next_frame) | |
0c884e17 | 769 | { |
b6fcb393 | 770 | return frame_unwind_register_unsigned (next_frame, E_PC_REGNUM); |
0c884e17 CV |
771 | } |
772 | ||
b6fcb393 | 773 | static struct frame_id |
94afd7a6 | 774 | xstormy16_dummy_id (struct gdbarch *gdbarch, struct frame_info *this_frame) |
b6fcb393 | 775 | { |
94afd7a6 UW |
776 | CORE_ADDR sp = get_frame_register_unsigned (this_frame, E_SP_REGNUM); |
777 | return frame_id_build (sp, get_frame_pc (this_frame)); | |
b6fcb393 CV |
778 | } |
779 | ||
780 | ||
0c884e17 CV |
781 | /* Function: xstormy16_gdbarch_init |
782 | Initializer function for the xstormy16 gdbarch vector. | |
581e13c1 | 783 | Called by gdbarch. Sets up the gdbarch vector(s) for this target. */ |
0c884e17 CV |
784 | |
785 | static struct gdbarch * | |
786 | xstormy16_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches) | |
787 | { | |
0c884e17 CV |
788 | struct gdbarch *gdbarch; |
789 | ||
581e13c1 | 790 | /* find a candidate among the list of pre-declared architectures. */ |
0c884e17 CV |
791 | arches = gdbarch_list_lookup_by_info (arches, &info); |
792 | if (arches != NULL) | |
793 | return (arches->gdbarch); | |
794 | ||
b6fcb393 | 795 | gdbarch = gdbarch_alloc (&info, NULL); |
a5afb99f | 796 | |
0c884e17 | 797 | /* |
b6fcb393 | 798 | * Basic register fields and methods, datatype sizes and stuff. |
0c884e17 CV |
799 | */ |
800 | ||
801 | set_gdbarch_num_regs (gdbarch, E_NUM_REGS); | |
802 | set_gdbarch_num_pseudo_regs (gdbarch, 0); | |
803 | set_gdbarch_sp_regnum (gdbarch, E_SP_REGNUM); | |
0c884e17 CV |
804 | set_gdbarch_pc_regnum (gdbarch, E_PC_REGNUM); |
805 | set_gdbarch_register_name (gdbarch, xstormy16_register_name); | |
b6fcb393 | 806 | set_gdbarch_register_type (gdbarch, xstormy16_register_type); |
0c884e17 | 807 | |
71c08af0 | 808 | set_gdbarch_char_signed (gdbarch, 0); |
b6fcb393 | 809 | set_gdbarch_short_bit (gdbarch, 2 * TARGET_CHAR_BIT); |
0c884e17 | 810 | set_gdbarch_int_bit (gdbarch, 2 * TARGET_CHAR_BIT); |
b6fcb393 CV |
811 | set_gdbarch_long_bit (gdbarch, 4 * TARGET_CHAR_BIT); |
812 | set_gdbarch_long_long_bit (gdbarch, 8 * TARGET_CHAR_BIT); | |
813 | ||
814 | set_gdbarch_float_bit (gdbarch, 4 * TARGET_CHAR_BIT); | |
815 | set_gdbarch_double_bit (gdbarch, 8 * TARGET_CHAR_BIT); | |
816 | set_gdbarch_long_double_bit (gdbarch, 8 * TARGET_CHAR_BIT); | |
817 | ||
0c884e17 CV |
818 | set_gdbarch_ptr_bit (gdbarch, 2 * TARGET_CHAR_BIT); |
819 | set_gdbarch_addr_bit (gdbarch, 4 * TARGET_CHAR_BIT); | |
8da614df | 820 | set_gdbarch_dwarf2_addr_size (gdbarch, 4); |
0c884e17 CV |
821 | |
822 | set_gdbarch_address_to_pointer (gdbarch, xstormy16_address_to_pointer); | |
823 | set_gdbarch_pointer_to_address (gdbarch, xstormy16_pointer_to_address); | |
824 | ||
581e13c1 | 825 | /* Stack grows up. */ |
b6fcb393 | 826 | set_gdbarch_inner_than (gdbarch, core_addr_greaterthan); |
0c884e17 | 827 | |
b6fcb393 CV |
828 | /* |
829 | * Frame Info | |
830 | */ | |
831 | set_gdbarch_unwind_sp (gdbarch, xstormy16_unwind_sp); | |
832 | set_gdbarch_unwind_pc (gdbarch, xstormy16_unwind_pc); | |
94afd7a6 | 833 | set_gdbarch_dummy_id (gdbarch, xstormy16_dummy_id); |
b6fcb393 CV |
834 | set_gdbarch_frame_align (gdbarch, xstormy16_frame_align); |
835 | frame_base_set_default (gdbarch, &xstormy16_frame_base); | |
0c884e17 | 836 | |
b6fcb393 CV |
837 | set_gdbarch_skip_prologue (gdbarch, xstormy16_skip_prologue); |
838 | set_gdbarch_in_function_epilogue_p (gdbarch, | |
839 | xstormy16_in_function_epilogue_p); | |
840 | ||
841 | /* These values and methods are used when gdb calls a target function. */ | |
842 | set_gdbarch_push_dummy_call (gdbarch, xstormy16_push_dummy_call); | |
843 | set_gdbarch_breakpoint_from_pc (gdbarch, xstormy16_breakpoint_from_pc); | |
844 | set_gdbarch_return_value (gdbarch, xstormy16_return_value); | |
845 | ||
846 | set_gdbarch_skip_trampoline_code (gdbarch, xstormy16_skip_trampoline_code); | |
0c884e17 | 847 | |
36482093 AC |
848 | set_gdbarch_print_insn (gdbarch, print_insn_xstormy16); |
849 | ||
b6fcb393 CV |
850 | gdbarch_init_osabi (info, gdbarch); |
851 | ||
94afd7a6 UW |
852 | dwarf2_append_unwinders (gdbarch); |
853 | frame_unwind_append_unwinder (gdbarch, &xstormy16_frame_unwind); | |
b6fcb393 | 854 | |
0c884e17 CV |
855 | return gdbarch; |
856 | } | |
857 | ||
858 | /* Function: _initialize_xstormy16_tdep | |
859 | Initializer function for the Sanyo Xstormy16a module. | |
581e13c1 | 860 | Called by gdb at start-up. */ |
0c884e17 | 861 | |
581e13c1 MS |
862 | /* -Wmissing-prototypes */ |
863 | extern initialize_file_ftype _initialize_xstormy16_tdep; | |
a78f21af | 864 | |
0c884e17 CV |
865 | void |
866 | _initialize_xstormy16_tdep (void) | |
867 | { | |
0c884e17 | 868 | register_gdbarch_init (bfd_arch_xstormy16, xstormy16_gdbarch_init); |
0c884e17 | 869 | } |