Commit | Line | Data |
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0c884e17 | 1 | /* Target-dependent code for the Sanyo Xstormy16a (LC590000) processor. |
f4f9705a | 2 | |
c5a57081 | 3 | Copyright (C) 2001-2005, 2007-2012 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" |
b6fcb393 CV |
32 | #include "gdb_string.h" |
33 | #include "gdb_assert.h" | |
0c884e17 | 34 | #include "arch-utils.h" |
b6fcb393 | 35 | #include "floatformat.h" |
0c884e17 | 36 | #include "regcache.h" |
b6fcb393 CV |
37 | #include "doublest.h" |
38 | #include "osabi.h" | |
0c884e17 | 39 | #include "objfiles.h" |
0c884e17 CV |
40 | |
41 | enum gdb_regnum | |
42 | { | |
43 | /* Xstormy16 has 16 general purpose registers (R0-R15) plus PC. | |
44 | Functions will return their values in register R2-R7 as they fit. | |
45 | Otherwise a hidden pointer to an big enough area is given as argument | |
581e13c1 | 46 | to the function in r2. Further arguments are beginning in r3 then. |
0c884e17 CV |
47 | R13 is used as frame pointer when GCC compiles w/o optimization |
48 | R14 is used as "PSW", displaying the CPU status. | |
581e13c1 | 49 | R15 is used implicitely as stack pointer. */ |
0c884e17 CV |
50 | E_R0_REGNUM, |
51 | E_R1_REGNUM, | |
52 | E_R2_REGNUM, E_1ST_ARG_REGNUM = E_R2_REGNUM, E_PTR_RET_REGNUM = E_R2_REGNUM, | |
53 | E_R3_REGNUM, | |
54 | E_R4_REGNUM, | |
55 | E_R5_REGNUM, | |
56 | E_R6_REGNUM, | |
57 | E_R7_REGNUM, E_LST_ARG_REGNUM = E_R7_REGNUM, | |
58 | E_R8_REGNUM, | |
59 | E_R9_REGNUM, | |
60 | E_R10_REGNUM, | |
61 | E_R11_REGNUM, | |
62 | E_R12_REGNUM, | |
63 | E_R13_REGNUM, E_FP_REGNUM = E_R13_REGNUM, | |
64 | E_R14_REGNUM, E_PSW_REGNUM = E_R14_REGNUM, | |
65 | E_R15_REGNUM, E_SP_REGNUM = E_R15_REGNUM, | |
66 | E_PC_REGNUM, | |
67 | E_NUM_REGS | |
68 | }; | |
69 | ||
b6fcb393 CV |
70 | /* Use an invalid address value as 'not available' marker. */ |
71 | enum { REG_UNAVAIL = (CORE_ADDR) -1 }; | |
72 | ||
73 | struct xstormy16_frame_cache | |
74 | { | |
75 | /* Base address. */ | |
76 | CORE_ADDR base; | |
77 | CORE_ADDR pc; | |
78 | LONGEST framesize; | |
79 | int uses_fp; | |
80 | CORE_ADDR saved_regs[E_NUM_REGS]; | |
81 | CORE_ADDR saved_sp; | |
82 | }; | |
83 | ||
581e13c1 | 84 | /* Size of instructions, registers, etc. */ |
0c884e17 CV |
85 | enum |
86 | { | |
87 | xstormy16_inst_size = 2, | |
88 | xstormy16_reg_size = 2, | |
89 | xstormy16_pc_size = 4 | |
90 | }; | |
91 | ||
581e13c1 | 92 | /* Size of return datatype which fits into the remaining return registers. */ |
0c884e17 CV |
93 | #define E_MAX_RETTYPE_SIZE(regnum) ((E_LST_ARG_REGNUM - (regnum) + 1) \ |
94 | * xstormy16_reg_size) | |
95 | ||
581e13c1 | 96 | /* Size of return datatype which fits into all return registers. */ |
0c884e17 CV |
97 | enum |
98 | { | |
99 | E_MAX_RETTYPE_SIZE_IN_REGS = E_MAX_RETTYPE_SIZE (E_R2_REGNUM) | |
100 | }; | |
101 | ||
0c884e17 | 102 | /* Function: xstormy16_register_name |
b6fcb393 | 103 | Returns the name of the standard Xstormy16 register N. */ |
0c884e17 | 104 | |
fa88f677 | 105 | static const char * |
d93859e2 | 106 | xstormy16_register_name (struct gdbarch *gdbarch, int regnum) |
0c884e17 CV |
107 | { |
108 | static char *register_names[] = { | |
109 | "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", | |
110 | "r8", "r9", "r10", "r11", "r12", "r13", | |
111 | "psw", "sp", "pc" | |
112 | }; | |
113 | ||
b6fcb393 | 114 | if (regnum < 0 || regnum >= E_NUM_REGS) |
0c884e17 | 115 | internal_error (__FILE__, __LINE__, |
e2e0b3e5 | 116 | _("xstormy16_register_name: illegal register number %d"), |
0c884e17 CV |
117 | regnum); |
118 | else | |
119 | return register_names[regnum]; | |
120 | ||
121 | } | |
122 | ||
0c884e17 | 123 | static struct type * |
b6fcb393 | 124 | xstormy16_register_type (struct gdbarch *gdbarch, int regnum) |
0c884e17 | 125 | { |
b6fcb393 | 126 | if (regnum == E_PC_REGNUM) |
df4df182 | 127 | return builtin_type (gdbarch)->builtin_uint32; |
0c884e17 | 128 | else |
df4df182 | 129 | return builtin_type (gdbarch)->builtin_uint16; |
0c884e17 CV |
130 | } |
131 | ||
0c884e17 CV |
132 | /* Function: xstormy16_type_is_scalar |
133 | Makes the decision if a given type is a scalar types. Scalar | |
b6fcb393 | 134 | types are returned in the registers r2-r7 as they fit. */ |
0c884e17 CV |
135 | |
136 | static int | |
137 | xstormy16_type_is_scalar (struct type *t) | |
138 | { | |
139 | return (TYPE_CODE(t) != TYPE_CODE_STRUCT | |
140 | && TYPE_CODE(t) != TYPE_CODE_UNION | |
141 | && TYPE_CODE(t) != TYPE_CODE_ARRAY); | |
142 | } | |
143 | ||
b6fcb393 CV |
144 | /* Function: xstormy16_use_struct_convention |
145 | Returns non-zero if the given struct type will be returned using | |
146 | a special convention, rather than the normal function return method. | |
147 | 7sed in the contexts of the "return" command, and of | |
148 | target function calls from the debugger. */ | |
149 | ||
150 | static int | |
151 | xstormy16_use_struct_convention (struct type *type) | |
152 | { | |
153 | return !xstormy16_type_is_scalar (type) | |
154 | || TYPE_LENGTH (type) > E_MAX_RETTYPE_SIZE_IN_REGS; | |
155 | } | |
156 | ||
0c884e17 | 157 | /* Function: xstormy16_extract_return_value |
b6fcb393 CV |
158 | Find a function's return value in the appropriate registers (in |
159 | regbuf), and copy it into valbuf. */ | |
0c884e17 CV |
160 | |
161 | static void | |
b6fcb393 CV |
162 | xstormy16_extract_return_value (struct type *type, struct regcache *regcache, |
163 | void *valbuf) | |
0c884e17 | 164 | { |
b6fcb393 CV |
165 | int len = TYPE_LENGTH (type); |
166 | int i, regnum = E_1ST_ARG_REGNUM; | |
0c884e17 | 167 | |
b6fcb393 CV |
168 | for (i = 0; i < len; i += xstormy16_reg_size) |
169 | regcache_raw_read (regcache, regnum++, (char *) valbuf + i); | |
170 | } | |
171 | ||
172 | /* Function: xstormy16_store_return_value | |
173 | Copy the function return value from VALBUF into the | |
174 | proper location for a function return. | |
175 | Called only in the context of the "return" command. */ | |
176 | ||
177 | static void | |
178 | xstormy16_store_return_value (struct type *type, struct regcache *regcache, | |
179 | const void *valbuf) | |
180 | { | |
181 | if (TYPE_LENGTH (type) == 1) | |
182 | { | |
581e13c1 | 183 | /* Add leading zeros to the value. */ |
b6fcb393 CV |
184 | char buf[xstormy16_reg_size]; |
185 | memset (buf, 0, xstormy16_reg_size); | |
186 | memcpy (buf, valbuf, 1); | |
187 | regcache_raw_write (regcache, E_1ST_ARG_REGNUM, buf); | |
0c884e17 CV |
188 | } |
189 | else | |
190 | { | |
b6fcb393 CV |
191 | int len = TYPE_LENGTH (type); |
192 | int i, regnum = E_1ST_ARG_REGNUM; | |
0c884e17 | 193 | |
b6fcb393 CV |
194 | for (i = 0; i < len; i += xstormy16_reg_size) |
195 | regcache_raw_write (regcache, regnum++, (char *) valbuf + i); | |
0c884e17 CV |
196 | } |
197 | } | |
198 | ||
b6fcb393 | 199 | static enum return_value_convention |
6a3a010b | 200 | xstormy16_return_value (struct gdbarch *gdbarch, struct value *function, |
c055b101 | 201 | struct type *type, struct regcache *regcache, |
05c6a9a1 | 202 | gdb_byte *readbuf, const gdb_byte *writebuf) |
b6fcb393 CV |
203 | { |
204 | if (xstormy16_use_struct_convention (type)) | |
205 | return RETURN_VALUE_STRUCT_CONVENTION; | |
206 | if (writebuf) | |
207 | xstormy16_store_return_value (type, regcache, writebuf); | |
208 | else if (readbuf) | |
209 | xstormy16_extract_return_value (type, regcache, readbuf); | |
210 | return RETURN_VALUE_REGISTER_CONVENTION; | |
211 | } | |
212 | ||
213 | static CORE_ADDR | |
214 | xstormy16_frame_align (struct gdbarch *gdbarch, CORE_ADDR addr) | |
215 | { | |
216 | if (addr & 1) | |
217 | ++addr; | |
218 | return addr; | |
219 | } | |
220 | ||
221 | /* Function: xstormy16_push_dummy_call | |
0c884e17 CV |
222 | Setup the function arguments for GDB to call a function in the inferior. |
223 | Called only in the context of a target function call from the debugger. | |
b6fcb393 | 224 | Returns the value of the SP register after the args are pushed. */ |
0c884e17 CV |
225 | |
226 | static CORE_ADDR | |
b6fcb393 CV |
227 | xstormy16_push_dummy_call (struct gdbarch *gdbarch, |
228 | struct value *function, | |
229 | struct regcache *regcache, | |
230 | CORE_ADDR bp_addr, int nargs, | |
231 | struct value **args, | |
232 | CORE_ADDR sp, int struct_return, | |
233 | CORE_ADDR struct_addr) | |
0c884e17 | 234 | { |
e17a4113 | 235 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
0c884e17 CV |
236 | CORE_ADDR stack_dest = sp; |
237 | int argreg = E_1ST_ARG_REGNUM; | |
238 | int i, j; | |
239 | int typelen, slacklen; | |
05c6a9a1 | 240 | const gdb_byte *val; |
b6fcb393 | 241 | char buf[xstormy16_pc_size]; |
0c884e17 CV |
242 | |
243 | /* If struct_return is true, then the struct return address will | |
244 | consume one argument-passing register. */ | |
245 | if (struct_return) | |
b6fcb393 CV |
246 | { |
247 | regcache_cooked_write_unsigned (regcache, E_PTR_RET_REGNUM, struct_addr); | |
248 | argreg++; | |
249 | } | |
0c884e17 | 250 | |
581e13c1 | 251 | /* Arguments are passed in R2-R7 as they fit. If an argument doesn't |
0c884e17 CV |
252 | fit in the remaining registers we're switching over to the stack. |
253 | No argument is put on stack partially and as soon as we switched | |
254 | over to stack no further argument is put in a register even if it | |
b6fcb393 | 255 | would fit in the remaining unused registers. */ |
0c884e17 CV |
256 | for (i = 0; i < nargs && argreg <= E_LST_ARG_REGNUM; i++) |
257 | { | |
4754a64e | 258 | typelen = TYPE_LENGTH (value_enclosing_type (args[i])); |
0c884e17 CV |
259 | if (typelen > E_MAX_RETTYPE_SIZE (argreg)) |
260 | break; | |
261 | ||
581e13c1 | 262 | /* Put argument into registers wordwise. */ |
0fd88904 | 263 | val = value_contents (args[i]); |
0c884e17 | 264 | for (j = 0; j < typelen; j += xstormy16_reg_size) |
1c6e1b0d PM |
265 | { |
266 | ULONGEST regval; | |
267 | int size = (typelen - j == 1) ? 1 : xstormy16_reg_size; | |
268 | ||
269 | regval = extract_unsigned_integer (val + j, size, byte_order); | |
270 | regcache_cooked_write_unsigned (regcache, argreg++, regval); | |
271 | } | |
0c884e17 CV |
272 | } |
273 | ||
274 | /* Align SP */ | |
b6fcb393 | 275 | stack_dest = xstormy16_frame_align (gdbarch, stack_dest); |
0c884e17 CV |
276 | |
277 | /* Loop backwards through remaining arguments and push them on the stack, | |
b6fcb393 | 278 | wordaligned. */ |
0c884e17 CV |
279 | for (j = nargs - 1; j >= i; j--) |
280 | { | |
05c6a9a1 MS |
281 | char *val; |
282 | ||
4754a64e | 283 | typelen = TYPE_LENGTH (value_enclosing_type (args[j])); |
0c884e17 CV |
284 | slacklen = typelen & 1; |
285 | val = alloca (typelen + slacklen); | |
0fd88904 | 286 | memcpy (val, value_contents (args[j]), typelen); |
0c884e17 CV |
287 | memset (val + typelen, 0, slacklen); |
288 | ||
581e13c1 | 289 | /* Now write this data to the stack. The stack grows upwards. */ |
0c884e17 CV |
290 | write_memory (stack_dest, val, typelen + slacklen); |
291 | stack_dest += typelen + slacklen; | |
292 | } | |
293 | ||
e17a4113 | 294 | store_unsigned_integer (buf, xstormy16_pc_size, byte_order, bp_addr); |
b6fcb393 CV |
295 | write_memory (stack_dest, buf, xstormy16_pc_size); |
296 | stack_dest += xstormy16_pc_size; | |
0c884e17 | 297 | |
b6fcb393 CV |
298 | /* Update stack pointer. */ |
299 | regcache_cooked_write_unsigned (regcache, E_SP_REGNUM, stack_dest); | |
0c884e17 | 300 | |
b6fcb393 CV |
301 | /* Return the new stack pointer minus the return address slot since |
302 | that's what DWARF2/GCC uses as the frame's CFA. */ | |
303 | return stack_dest - xstormy16_pc_size; | |
0c884e17 CV |
304 | } |
305 | ||
306 | /* Function: xstormy16_scan_prologue | |
307 | Decode the instructions within the given address range. | |
308 | Decide when we must have reached the end of the function prologue. | |
309 | If a frame_info pointer is provided, fill in its saved_regs etc. | |
310 | ||
b6fcb393 | 311 | Returns the address of the first instruction after the prologue. */ |
0c884e17 CV |
312 | |
313 | static CORE_ADDR | |
e17a4113 UW |
314 | xstormy16_analyze_prologue (struct gdbarch *gdbarch, |
315 | CORE_ADDR start_addr, CORE_ADDR end_addr, | |
b6fcb393 | 316 | struct xstormy16_frame_cache *cache, |
94afd7a6 | 317 | struct frame_info *this_frame) |
0c884e17 | 318 | { |
e17a4113 | 319 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
0c884e17 CV |
320 | CORE_ADDR next_addr; |
321 | ULONGEST inst, inst2; | |
322 | LONGEST offset; | |
323 | int regnum; | |
324 | ||
581e13c1 | 325 | /* Initialize framesize with size of PC put on stack by CALLF inst. */ |
b6fcb393 CV |
326 | cache->saved_regs[E_PC_REGNUM] = 0; |
327 | cache->framesize = xstormy16_pc_size; | |
328 | ||
329 | if (start_addr >= end_addr) | |
330 | return end_addr; | |
331 | ||
0c884e17 CV |
332 | for (next_addr = start_addr; |
333 | next_addr < end_addr; next_addr += xstormy16_inst_size) | |
334 | { | |
e17a4113 UW |
335 | inst = read_memory_unsigned_integer (next_addr, |
336 | xstormy16_inst_size, byte_order); | |
0c884e17 | 337 | inst2 = read_memory_unsigned_integer (next_addr + xstormy16_inst_size, |
e17a4113 | 338 | xstormy16_inst_size, byte_order); |
0c884e17 CV |
339 | |
340 | if (inst >= 0x0082 && inst <= 0x008d) /* push r2 .. push r13 */ | |
341 | { | |
b6fcb393 CV |
342 | regnum = inst & 0x000f; |
343 | cache->saved_regs[regnum] = cache->framesize; | |
344 | cache->framesize += xstormy16_reg_size; | |
0c884e17 CV |
345 | } |
346 | ||
581e13c1 MS |
347 | /* Optional stack allocation for args and local vars <= 4 byte. */ |
348 | else if (inst == 0x301f || inst == 0x303f) /* inc r15, #0x1/#0x3 */ | |
0c884e17 | 349 | { |
b6fcb393 | 350 | cache->framesize += ((inst & 0x0030) >> 4) + 1; |
0c884e17 CV |
351 | } |
352 | ||
353 | /* optional stack allocation for args and local vars > 4 && < 16 byte */ | |
354 | else if ((inst & 0xff0f) == 0x510f) /* 51Hf add r15, #0xH */ | |
355 | { | |
b6fcb393 | 356 | cache->framesize += (inst & 0x00f0) >> 4; |
0c884e17 CV |
357 | } |
358 | ||
581e13c1 MS |
359 | /* Optional stack allocation for args and local vars >= 16 byte. */ |
360 | else if (inst == 0x314f && inst2 >= 0x0010) /* 314f HHHH add r15, #0xH */ | |
0c884e17 | 361 | { |
b6fcb393 | 362 | cache->framesize += inst2; |
0c884e17 CV |
363 | next_addr += xstormy16_inst_size; |
364 | } | |
365 | ||
366 | else if (inst == 0x46fd) /* mov r13, r15 */ | |
367 | { | |
b6fcb393 | 368 | cache->uses_fp = 1; |
0c884e17 CV |
369 | } |
370 | ||
581e13c1 MS |
371 | /* optional copying of args in r2-r7 to r10-r13. */ |
372 | /* Probably only in optimized case but legal action for prologue. */ | |
0c884e17 CV |
373 | else if ((inst & 0xff00) == 0x4600 /* 46SD mov rD, rS */ |
374 | && (inst & 0x00f0) >= 0x0020 && (inst & 0x00f0) <= 0x0070 | |
375 | && (inst & 0x000f) >= 0x00a0 && (inst & 0x000f) <= 0x000d) | |
376 | ; | |
377 | ||
581e13c1 MS |
378 | /* Optional copying of args in r2-r7 to stack. */ |
379 | /* 72DS HHHH mov.b (rD, 0xHHHH), r(S-8) | |
380 | (bit3 always 1, bit2-0 = reg) */ | |
0c884e17 CV |
381 | /* 73DS HHHH mov.w (rD, 0xHHHH), r(S-8) */ |
382 | else if ((inst & 0xfed8) == 0x72d8 && (inst & 0x0007) >= 2) | |
383 | { | |
b6fcb393 CV |
384 | regnum = inst & 0x0007; |
385 | /* Only 12 of 16 bits of the argument are used for the | |
581e13c1 | 386 | signed offset. */ |
b6fcb393 CV |
387 | offset = (LONGEST) (inst2 & 0x0fff); |
388 | if (offset & 0x0800) | |
389 | offset -= 0x1000; | |
390 | ||
391 | cache->saved_regs[regnum] = cache->framesize + offset; | |
0c884e17 CV |
392 | next_addr += xstormy16_inst_size; |
393 | } | |
0c884e17 | 394 | |
581e13c1 | 395 | else /* Not a prologue instruction. */ |
0c884e17 CV |
396 | break; |
397 | } | |
398 | ||
0c884e17 CV |
399 | return next_addr; |
400 | } | |
401 | ||
402 | /* Function: xstormy16_skip_prologue | |
403 | If the input address is in a function prologue, | |
404 | returns the address of the end of the prologue; | |
405 | else returns the input address. | |
406 | ||
407 | Note: the input address is likely to be the function start, | |
408 | since this function is mainly used for advancing a breakpoint | |
409 | to the first line, or stepping to the first line when we have | |
410 | stepped into a function call. */ | |
411 | ||
412 | static CORE_ADDR | |
6093d2eb | 413 | xstormy16_skip_prologue (struct gdbarch *gdbarch, CORE_ADDR pc) |
0c884e17 CV |
414 | { |
415 | CORE_ADDR func_addr = 0, func_end = 0; | |
2c02bd72 | 416 | const char *func_name; |
0c884e17 CV |
417 | |
418 | if (find_pc_partial_function (pc, &func_name, &func_addr, &func_end)) | |
419 | { | |
420 | struct symtab_and_line sal; | |
421 | struct symbol *sym; | |
b6fcb393 | 422 | struct xstormy16_frame_cache cache; |
57fdbbbe | 423 | CORE_ADDR plg_end; |
0c884e17 | 424 | |
28fe5f6a KB |
425 | memset (&cache, 0, sizeof cache); |
426 | ||
581e13c1 | 427 | /* Don't trust line number debug info in frameless functions. */ |
e17a4113 UW |
428 | plg_end = xstormy16_analyze_prologue (gdbarch, func_addr, func_end, |
429 | &cache, NULL); | |
b6fcb393 | 430 | if (!cache.uses_fp) |
211a4f69 CV |
431 | return plg_end; |
432 | ||
0c884e17 | 433 | /* Found a function. */ |
2570f2b7 | 434 | sym = lookup_symbol (func_name, NULL, VAR_DOMAIN, NULL); |
581e13c1 | 435 | /* Don't use line number debug info for assembly source files. */ |
0c884e17 CV |
436 | if (sym && SYMBOL_LANGUAGE (sym) != language_asm) |
437 | { | |
0c884e17 CV |
438 | sal = find_pc_line (func_addr, 0); |
439 | if (sal.end && sal.end < func_end) | |
440 | { | |
441 | /* Found a line number, use it as end of prologue. */ | |
442 | return sal.end; | |
443 | } | |
444 | } | |
581e13c1 | 445 | /* No useable line symbol. Use result of prologue parsing method. */ |
211a4f69 | 446 | return plg_end; |
0c884e17 CV |
447 | } |
448 | ||
581e13c1 | 449 | /* No function symbol -- just return the PC. */ |
0c884e17 CV |
450 | |
451 | return (CORE_ADDR) pc; | |
452 | } | |
453 | ||
454 | /* The epilogue is defined here as the area at the end of a function, | |
455 | either on the `ret' instruction itself or after an instruction which | |
581e13c1 | 456 | destroys the function's stack frame. */ |
0c884e17 CV |
457 | static int |
458 | xstormy16_in_function_epilogue_p (struct gdbarch *gdbarch, CORE_ADDR pc) | |
459 | { | |
e17a4113 | 460 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
b6fcb393 | 461 | CORE_ADDR func_addr = 0, func_end = 0; |
0c884e17 CV |
462 | |
463 | if (find_pc_partial_function (pc, NULL, &func_addr, &func_end)) | |
464 | { | |
465 | ULONGEST inst, inst2; | |
466 | CORE_ADDR addr = func_end - xstormy16_inst_size; | |
467 | ||
581e13c1 | 468 | /* The Xstormy16 epilogue is max. 14 bytes long. */ |
0c884e17 CV |
469 | if (pc < func_end - 7 * xstormy16_inst_size) |
470 | return 0; | |
471 | ||
472 | /* Check if we're on a `ret' instruction. Otherwise it's | |
581e13c1 | 473 | too dangerous to proceed. */ |
e17a4113 UW |
474 | inst = read_memory_unsigned_integer (addr, |
475 | xstormy16_inst_size, byte_order); | |
0c884e17 CV |
476 | if (inst != 0x0003) |
477 | return 0; | |
478 | ||
479 | while ((addr -= xstormy16_inst_size) >= func_addr) | |
480 | { | |
e17a4113 | 481 | inst = read_memory_unsigned_integer (addr, |
581e13c1 MS |
482 | xstormy16_inst_size, |
483 | byte_order); | |
0c884e17 CV |
484 | if (inst >= 0x009a && inst <= 0x009d) /* pop r10...r13 */ |
485 | continue; | |
486 | if (inst == 0x305f || inst == 0x307f) /* dec r15, #0x1/#0x3 */ | |
487 | break; | |
488 | inst2 = read_memory_unsigned_integer (addr - xstormy16_inst_size, | |
581e13c1 MS |
489 | xstormy16_inst_size, |
490 | byte_order); | |
491 | if (inst2 == 0x314f && inst >= 0x8000) /* add r15, neg. value */ | |
0c884e17 CV |
492 | { |
493 | addr -= xstormy16_inst_size; | |
494 | break; | |
495 | } | |
496 | return 0; | |
497 | } | |
498 | if (pc > addr) | |
499 | return 1; | |
500 | } | |
501 | return 0; | |
502 | } | |
503 | ||
f4f9705a | 504 | const static unsigned char * |
67d57894 MD |
505 | xstormy16_breakpoint_from_pc (struct gdbarch *gdbarch, CORE_ADDR *pcptr, |
506 | int *lenptr) | |
0c884e17 CV |
507 | { |
508 | static unsigned char breakpoint[] = { 0x06, 0x0 }; | |
509 | *lenptr = sizeof (breakpoint); | |
510 | return breakpoint; | |
511 | } | |
512 | ||
513 | /* Given a pointer to a jump table entry, return the address | |
581e13c1 | 514 | of the function it jumps to. Return 0 if not found. */ |
0c884e17 | 515 | static CORE_ADDR |
e17a4113 | 516 | xstormy16_resolve_jmp_table_entry (struct gdbarch *gdbarch, CORE_ADDR faddr) |
0c884e17 | 517 | { |
e17a4113 | 518 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
0c884e17 CV |
519 | struct obj_section *faddr_sect = find_pc_section (faddr); |
520 | ||
521 | if (faddr_sect) | |
522 | { | |
523 | LONGEST inst, inst2, addr; | |
524 | char buf[2 * xstormy16_inst_size]; | |
525 | ||
581e13c1 | 526 | /* Return faddr if it's not pointing into the jump table. */ |
0c884e17 CV |
527 | if (strcmp (faddr_sect->the_bfd_section->name, ".plt")) |
528 | return faddr; | |
529 | ||
530 | if (!target_read_memory (faddr, buf, sizeof buf)) | |
531 | { | |
e17a4113 UW |
532 | inst = extract_unsigned_integer (buf, |
533 | xstormy16_inst_size, byte_order); | |
0c884e17 | 534 | inst2 = extract_unsigned_integer (buf + xstormy16_inst_size, |
e17a4113 | 535 | xstormy16_inst_size, byte_order); |
0c884e17 CV |
536 | addr = inst2 << 8 | (inst & 0xff); |
537 | return addr; | |
538 | } | |
539 | } | |
540 | return 0; | |
541 | } | |
542 | ||
543 | /* Given a function's address, attempt to find (and return) the | |
544 | address of the corresponding jump table entry. Return 0 if | |
581e13c1 | 545 | not found. */ |
0c884e17 | 546 | static CORE_ADDR |
e17a4113 | 547 | xstormy16_find_jmp_table_entry (struct gdbarch *gdbarch, CORE_ADDR faddr) |
0c884e17 | 548 | { |
e17a4113 | 549 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
0c884e17 CV |
550 | struct obj_section *faddr_sect = find_pc_section (faddr); |
551 | ||
552 | if (faddr_sect) | |
553 | { | |
554 | struct obj_section *osect; | |
555 | ||
581e13c1 | 556 | /* Return faddr if it's already a pointer to a jump table entry. */ |
0c884e17 CV |
557 | if (!strcmp (faddr_sect->the_bfd_section->name, ".plt")) |
558 | return faddr; | |
559 | ||
560 | ALL_OBJFILE_OSECTIONS (faddr_sect->objfile, osect) | |
561 | { | |
562 | if (!strcmp (osect->the_bfd_section->name, ".plt")) | |
563 | break; | |
564 | } | |
565 | ||
566 | if (osect < faddr_sect->objfile->sections_end) | |
567 | { | |
aded6f54 PA |
568 | CORE_ADDR addr, endaddr; |
569 | ||
570 | addr = obj_section_addr (osect); | |
571 | endaddr = obj_section_endaddr (osect); | |
572 | ||
573 | for (; addr < endaddr; addr += 2 * xstormy16_inst_size) | |
0c884e17 | 574 | { |
0c884e17 CV |
575 | LONGEST inst, inst2, faddr2; |
576 | char buf[2 * xstormy16_inst_size]; | |
577 | ||
578 | if (target_read_memory (addr, buf, sizeof buf)) | |
579 | return 0; | |
e17a4113 | 580 | inst = extract_unsigned_integer (buf, |
581e13c1 MS |
581 | xstormy16_inst_size, |
582 | byte_order); | |
0c884e17 | 583 | inst2 = extract_unsigned_integer (buf + xstormy16_inst_size, |
581e13c1 MS |
584 | xstormy16_inst_size, |
585 | byte_order); | |
0c884e17 CV |
586 | faddr2 = inst2 << 8 | (inst & 0xff); |
587 | if (faddr == faddr2) | |
588 | return addr; | |
589 | } | |
590 | } | |
591 | } | |
592 | return 0; | |
593 | } | |
594 | ||
595 | static CORE_ADDR | |
52f729a7 | 596 | xstormy16_skip_trampoline_code (struct frame_info *frame, CORE_ADDR pc) |
0c884e17 | 597 | { |
e17a4113 UW |
598 | struct gdbarch *gdbarch = get_frame_arch (frame); |
599 | CORE_ADDR tmp = xstormy16_resolve_jmp_table_entry (gdbarch, pc); | |
0c884e17 CV |
600 | |
601 | if (tmp && tmp != pc) | |
602 | return tmp; | |
603 | return 0; | |
604 | } | |
605 | ||
b6fcb393 CV |
606 | /* Function pointers are 16 bit. The address space is 24 bit, using |
607 | 32 bit addresses. Pointers to functions on the XStormy16 are implemented | |
608 | by using 16 bit pointers, which are either direct pointers in case the | |
609 | function begins below 0x10000, or indirect pointers into a jump table. | |
610 | The next two functions convert 16 bit pointers into 24 (32) bit addresses | |
611 | and vice versa. */ | |
612 | ||
0c884e17 | 613 | static CORE_ADDR |
9898f801 UW |
614 | xstormy16_pointer_to_address (struct gdbarch *gdbarch, |
615 | struct type *type, const gdb_byte *buf) | |
0c884e17 | 616 | { |
e17a4113 | 617 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
0c884e17 | 618 | enum type_code target = TYPE_CODE (TYPE_TARGET_TYPE (type)); |
e17a4113 UW |
619 | CORE_ADDR addr |
620 | = extract_unsigned_integer (buf, TYPE_LENGTH (type), byte_order); | |
0c884e17 CV |
621 | |
622 | if (target == TYPE_CODE_FUNC || target == TYPE_CODE_METHOD) | |
623 | { | |
e17a4113 | 624 | CORE_ADDR addr2 = xstormy16_resolve_jmp_table_entry (gdbarch, addr); |
0c884e17 CV |
625 | if (addr2) |
626 | addr = addr2; | |
627 | } | |
628 | ||
629 | return addr; | |
630 | } | |
631 | ||
632 | static void | |
9898f801 UW |
633 | xstormy16_address_to_pointer (struct gdbarch *gdbarch, |
634 | struct type *type, gdb_byte *buf, CORE_ADDR addr) | |
0c884e17 | 635 | { |
e17a4113 | 636 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
0c884e17 CV |
637 | enum type_code target = TYPE_CODE (TYPE_TARGET_TYPE (type)); |
638 | ||
639 | if (target == TYPE_CODE_FUNC || target == TYPE_CODE_METHOD) | |
640 | { | |
e17a4113 | 641 | CORE_ADDR addr2 = xstormy16_find_jmp_table_entry (gdbarch, addr); |
0c884e17 CV |
642 | if (addr2) |
643 | addr = addr2; | |
644 | } | |
e17a4113 | 645 | store_unsigned_integer (buf, TYPE_LENGTH (type), byte_order, addr); |
0c884e17 CV |
646 | } |
647 | ||
b6fcb393 CV |
648 | static struct xstormy16_frame_cache * |
649 | xstormy16_alloc_frame_cache (void) | |
0c884e17 | 650 | { |
b6fcb393 CV |
651 | struct xstormy16_frame_cache *cache; |
652 | int i; | |
653 | ||
654 | cache = FRAME_OBSTACK_ZALLOC (struct xstormy16_frame_cache); | |
655 | ||
656 | cache->base = 0; | |
657 | cache->saved_sp = 0; | |
658 | cache->pc = 0; | |
659 | cache->uses_fp = 0; | |
660 | cache->framesize = 0; | |
661 | for (i = 0; i < E_NUM_REGS; ++i) | |
662 | cache->saved_regs[i] = REG_UNAVAIL; | |
663 | ||
664 | return cache; | |
665 | } | |
666 | ||
667 | static struct xstormy16_frame_cache * | |
94afd7a6 | 668 | xstormy16_frame_cache (struct frame_info *this_frame, void **this_cache) |
b6fcb393 | 669 | { |
e17a4113 | 670 | struct gdbarch *gdbarch = get_frame_arch (this_frame); |
b6fcb393 CV |
671 | struct xstormy16_frame_cache *cache; |
672 | CORE_ADDR current_pc; | |
673 | int i; | |
674 | ||
675 | if (*this_cache) | |
676 | return *this_cache; | |
677 | ||
678 | cache = xstormy16_alloc_frame_cache (); | |
679 | *this_cache = cache; | |
680 | ||
94afd7a6 | 681 | cache->base = get_frame_register_unsigned (this_frame, E_FP_REGNUM); |
b6fcb393 CV |
682 | if (cache->base == 0) |
683 | return cache; | |
684 | ||
94afd7a6 UW |
685 | cache->pc = get_frame_func (this_frame); |
686 | current_pc = get_frame_pc (this_frame); | |
b6fcb393 | 687 | if (cache->pc) |
e17a4113 UW |
688 | xstormy16_analyze_prologue (gdbarch, cache->pc, current_pc, |
689 | cache, this_frame); | |
b6fcb393 CV |
690 | |
691 | if (!cache->uses_fp) | |
94afd7a6 | 692 | cache->base = get_frame_register_unsigned (this_frame, E_SP_REGNUM); |
b6fcb393 CV |
693 | |
694 | cache->saved_sp = cache->base - cache->framesize; | |
695 | ||
696 | for (i = 0; i < E_NUM_REGS; ++i) | |
697 | if (cache->saved_regs[i] != REG_UNAVAIL) | |
698 | cache->saved_regs[i] += cache->saved_sp; | |
699 | ||
700 | return cache; | |
0c884e17 CV |
701 | } |
702 | ||
94afd7a6 UW |
703 | static struct value * |
704 | xstormy16_frame_prev_register (struct frame_info *this_frame, | |
705 | void **this_cache, int regnum) | |
b6fcb393 | 706 | { |
94afd7a6 | 707 | struct xstormy16_frame_cache *cache = xstormy16_frame_cache (this_frame, |
b6fcb393 CV |
708 | this_cache); |
709 | gdb_assert (regnum >= 0); | |
710 | ||
711 | if (regnum == E_SP_REGNUM && cache->saved_sp) | |
94afd7a6 | 712 | return frame_unwind_got_constant (this_frame, regnum, cache->saved_sp); |
b6fcb393 CV |
713 | |
714 | if (regnum < E_NUM_REGS && cache->saved_regs[regnum] != REG_UNAVAIL) | |
94afd7a6 UW |
715 | return frame_unwind_got_memory (this_frame, regnum, |
716 | cache->saved_regs[regnum]); | |
b6fcb393 | 717 | |
94afd7a6 | 718 | return frame_unwind_got_register (this_frame, regnum, regnum); |
b6fcb393 CV |
719 | } |
720 | ||
721 | static void | |
94afd7a6 | 722 | xstormy16_frame_this_id (struct frame_info *this_frame, void **this_cache, |
b6fcb393 CV |
723 | struct frame_id *this_id) |
724 | { | |
94afd7a6 | 725 | struct xstormy16_frame_cache *cache = xstormy16_frame_cache (this_frame, |
b6fcb393 CV |
726 | this_cache); |
727 | ||
728 | /* This marks the outermost frame. */ | |
729 | if (cache->base == 0) | |
730 | return; | |
731 | ||
732 | *this_id = frame_id_build (cache->saved_sp, cache->pc); | |
733 | } | |
734 | ||
735 | static CORE_ADDR | |
94afd7a6 | 736 | xstormy16_frame_base_address (struct frame_info *this_frame, void **this_cache) |
b6fcb393 | 737 | { |
94afd7a6 | 738 | struct xstormy16_frame_cache *cache = xstormy16_frame_cache (this_frame, |
b6fcb393 CV |
739 | this_cache); |
740 | return cache->base; | |
741 | } | |
742 | ||
743 | static const struct frame_unwind xstormy16_frame_unwind = { | |
744 | NORMAL_FRAME, | |
8fbca658 | 745 | default_frame_unwind_stop_reason, |
b6fcb393 | 746 | xstormy16_frame_this_id, |
94afd7a6 UW |
747 | xstormy16_frame_prev_register, |
748 | NULL, | |
749 | default_frame_sniffer | |
b6fcb393 CV |
750 | }; |
751 | ||
752 | static const struct frame_base xstormy16_frame_base = { | |
753 | &xstormy16_frame_unwind, | |
754 | xstormy16_frame_base_address, | |
755 | xstormy16_frame_base_address, | |
756 | xstormy16_frame_base_address | |
757 | }; | |
758 | ||
b6fcb393 CV |
759 | static CORE_ADDR |
760 | xstormy16_unwind_sp (struct gdbarch *gdbarch, struct frame_info *next_frame) | |
761 | { | |
762 | return frame_unwind_register_unsigned (next_frame, E_SP_REGNUM); | |
763 | } | |
764 | ||
765 | static CORE_ADDR | |
766 | xstormy16_unwind_pc (struct gdbarch *gdbarch, struct frame_info *next_frame) | |
0c884e17 | 767 | { |
b6fcb393 | 768 | return frame_unwind_register_unsigned (next_frame, E_PC_REGNUM); |
0c884e17 CV |
769 | } |
770 | ||
b6fcb393 | 771 | static struct frame_id |
94afd7a6 | 772 | xstormy16_dummy_id (struct gdbarch *gdbarch, struct frame_info *this_frame) |
b6fcb393 | 773 | { |
94afd7a6 UW |
774 | CORE_ADDR sp = get_frame_register_unsigned (this_frame, E_SP_REGNUM); |
775 | return frame_id_build (sp, get_frame_pc (this_frame)); | |
b6fcb393 CV |
776 | } |
777 | ||
778 | ||
0c884e17 CV |
779 | /* Function: xstormy16_gdbarch_init |
780 | Initializer function for the xstormy16 gdbarch vector. | |
581e13c1 | 781 | Called by gdbarch. Sets up the gdbarch vector(s) for this target. */ |
0c884e17 CV |
782 | |
783 | static struct gdbarch * | |
784 | xstormy16_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches) | |
785 | { | |
0c884e17 CV |
786 | struct gdbarch *gdbarch; |
787 | ||
581e13c1 | 788 | /* find a candidate among the list of pre-declared architectures. */ |
0c884e17 CV |
789 | arches = gdbarch_list_lookup_by_info (arches, &info); |
790 | if (arches != NULL) | |
791 | return (arches->gdbarch); | |
792 | ||
b6fcb393 | 793 | gdbarch = gdbarch_alloc (&info, NULL); |
a5afb99f | 794 | |
0c884e17 | 795 | /* |
b6fcb393 | 796 | * Basic register fields and methods, datatype sizes and stuff. |
0c884e17 CV |
797 | */ |
798 | ||
799 | set_gdbarch_num_regs (gdbarch, E_NUM_REGS); | |
800 | set_gdbarch_num_pseudo_regs (gdbarch, 0); | |
801 | set_gdbarch_sp_regnum (gdbarch, E_SP_REGNUM); | |
0c884e17 CV |
802 | set_gdbarch_pc_regnum (gdbarch, E_PC_REGNUM); |
803 | set_gdbarch_register_name (gdbarch, xstormy16_register_name); | |
b6fcb393 | 804 | set_gdbarch_register_type (gdbarch, xstormy16_register_type); |
0c884e17 | 805 | |
71c08af0 | 806 | set_gdbarch_char_signed (gdbarch, 0); |
b6fcb393 | 807 | set_gdbarch_short_bit (gdbarch, 2 * TARGET_CHAR_BIT); |
0c884e17 | 808 | set_gdbarch_int_bit (gdbarch, 2 * TARGET_CHAR_BIT); |
b6fcb393 CV |
809 | set_gdbarch_long_bit (gdbarch, 4 * TARGET_CHAR_BIT); |
810 | set_gdbarch_long_long_bit (gdbarch, 8 * TARGET_CHAR_BIT); | |
811 | ||
812 | set_gdbarch_float_bit (gdbarch, 4 * TARGET_CHAR_BIT); | |
813 | set_gdbarch_double_bit (gdbarch, 8 * TARGET_CHAR_BIT); | |
814 | set_gdbarch_long_double_bit (gdbarch, 8 * TARGET_CHAR_BIT); | |
815 | ||
0c884e17 CV |
816 | set_gdbarch_ptr_bit (gdbarch, 2 * TARGET_CHAR_BIT); |
817 | set_gdbarch_addr_bit (gdbarch, 4 * TARGET_CHAR_BIT); | |
8da614df | 818 | set_gdbarch_dwarf2_addr_size (gdbarch, 4); |
0c884e17 CV |
819 | |
820 | set_gdbarch_address_to_pointer (gdbarch, xstormy16_address_to_pointer); | |
821 | set_gdbarch_pointer_to_address (gdbarch, xstormy16_pointer_to_address); | |
822 | ||
581e13c1 | 823 | /* Stack grows up. */ |
b6fcb393 | 824 | set_gdbarch_inner_than (gdbarch, core_addr_greaterthan); |
0c884e17 | 825 | |
b6fcb393 CV |
826 | /* |
827 | * Frame Info | |
828 | */ | |
829 | set_gdbarch_unwind_sp (gdbarch, xstormy16_unwind_sp); | |
830 | set_gdbarch_unwind_pc (gdbarch, xstormy16_unwind_pc); | |
94afd7a6 | 831 | set_gdbarch_dummy_id (gdbarch, xstormy16_dummy_id); |
b6fcb393 CV |
832 | set_gdbarch_frame_align (gdbarch, xstormy16_frame_align); |
833 | frame_base_set_default (gdbarch, &xstormy16_frame_base); | |
0c884e17 | 834 | |
b6fcb393 CV |
835 | set_gdbarch_skip_prologue (gdbarch, xstormy16_skip_prologue); |
836 | set_gdbarch_in_function_epilogue_p (gdbarch, | |
837 | xstormy16_in_function_epilogue_p); | |
838 | ||
839 | /* These values and methods are used when gdb calls a target function. */ | |
840 | set_gdbarch_push_dummy_call (gdbarch, xstormy16_push_dummy_call); | |
841 | set_gdbarch_breakpoint_from_pc (gdbarch, xstormy16_breakpoint_from_pc); | |
842 | set_gdbarch_return_value (gdbarch, xstormy16_return_value); | |
843 | ||
844 | set_gdbarch_skip_trampoline_code (gdbarch, xstormy16_skip_trampoline_code); | |
0c884e17 | 845 | |
36482093 AC |
846 | set_gdbarch_print_insn (gdbarch, print_insn_xstormy16); |
847 | ||
b6fcb393 CV |
848 | gdbarch_init_osabi (info, gdbarch); |
849 | ||
94afd7a6 UW |
850 | dwarf2_append_unwinders (gdbarch); |
851 | frame_unwind_append_unwinder (gdbarch, &xstormy16_frame_unwind); | |
b6fcb393 | 852 | |
0c884e17 CV |
853 | return gdbarch; |
854 | } | |
855 | ||
856 | /* Function: _initialize_xstormy16_tdep | |
857 | Initializer function for the Sanyo Xstormy16a module. | |
581e13c1 | 858 | Called by gdb at start-up. */ |
0c884e17 | 859 | |
581e13c1 MS |
860 | /* -Wmissing-prototypes */ |
861 | extern initialize_file_ftype _initialize_xstormy16_tdep; | |
a78f21af | 862 | |
0c884e17 CV |
863 | void |
864 | _initialize_xstormy16_tdep (void) | |
865 | { | |
0c884e17 | 866 | register_gdbarch_init (bfd_arch_xstormy16, xstormy16_gdbarch_init); |
0c884e17 | 867 | } |