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5769d3cd | 1 | /* Target-dependent code for GDB, the GNU debugger. |
ca557f44 | 2 | |
9ab9195f | 3 | Copyright 2001, 2002, 2003, 2004 Free Software Foundation, Inc. |
ca557f44 | 4 | |
5769d3cd AC |
5 | Contributed by D.J. Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com) |
6 | for IBM Deutschland Entwicklung GmbH, IBM Corporation. | |
7 | ||
8 | This file is part of GDB. | |
9 | ||
10 | This program is free software; you can redistribute it and/or modify | |
11 | it under the terms of the GNU General Public License as published by | |
12 | the Free Software Foundation; either version 2 of the License, or | |
13 | (at your option) any later version. | |
14 | ||
15 | This program is distributed in the hope that it will be useful, | |
16 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | GNU General Public License for more details. | |
19 | ||
20 | You should have received a copy of the GNU General Public License | |
21 | along with this program; if not, write to the Free Software | |
22 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA | |
23 | 02111-1307, USA. */ | |
24 | ||
d0f54f9d | 25 | #include "defs.h" |
5769d3cd AC |
26 | #include "arch-utils.h" |
27 | #include "frame.h" | |
28 | #include "inferior.h" | |
29 | #include "symtab.h" | |
30 | #include "target.h" | |
31 | #include "gdbcore.h" | |
32 | #include "gdbcmd.h" | |
5769d3cd AC |
33 | #include "objfiles.h" |
34 | #include "tm.h" | |
35 | #include "../bfd/bfd.h" | |
36 | #include "floatformat.h" | |
37 | #include "regcache.h" | |
d0f54f9d JB |
38 | #include "reggroups.h" |
39 | #include "regset.h" | |
fd0407d6 | 40 | #include "value.h" |
78f8b424 | 41 | #include "gdb_assert.h" |
a89aa300 | 42 | #include "dis-asm.h" |
5769d3cd | 43 | |
d0f54f9d | 44 | #include "s390-tdep.h" |
5769d3cd | 45 | |
60e6cc42 | 46 | |
d0f54f9d JB |
47 | /* The tdep structure. */ |
48 | ||
49 | struct gdbarch_tdep | |
5769d3cd | 50 | { |
b0cf273e JB |
51 | /* ABI version. */ |
52 | enum { ABI_LINUX_S390, ABI_LINUX_ZSERIES } abi; | |
53 | ||
d0f54f9d JB |
54 | /* Core file register sets. */ |
55 | const struct regset *gregset; | |
56 | int sizeof_gregset; | |
57 | ||
58 | const struct regset *fpregset; | |
59 | int sizeof_fpregset; | |
60 | }; | |
61 | ||
62 | ||
63 | /* Register information. */ | |
64 | ||
65 | struct s390_register_info | |
66 | { | |
67 | char *name; | |
68 | struct type **type; | |
69 | }; | |
70 | ||
71 | static struct s390_register_info s390_register_info[S390_NUM_TOTAL_REGS] = | |
72 | { | |
73 | /* Program Status Word. */ | |
74 | { "pswm", &builtin_type_long }, | |
75 | { "pswa", &builtin_type_long }, | |
76 | ||
77 | /* General Purpose Registers. */ | |
78 | { "r0", &builtin_type_long }, | |
79 | { "r1", &builtin_type_long }, | |
80 | { "r2", &builtin_type_long }, | |
81 | { "r3", &builtin_type_long }, | |
82 | { "r4", &builtin_type_long }, | |
83 | { "r5", &builtin_type_long }, | |
84 | { "r6", &builtin_type_long }, | |
85 | { "r7", &builtin_type_long }, | |
86 | { "r8", &builtin_type_long }, | |
87 | { "r9", &builtin_type_long }, | |
88 | { "r10", &builtin_type_long }, | |
89 | { "r11", &builtin_type_long }, | |
90 | { "r12", &builtin_type_long }, | |
91 | { "r13", &builtin_type_long }, | |
92 | { "r14", &builtin_type_long }, | |
93 | { "r15", &builtin_type_long }, | |
94 | ||
95 | /* Access Registers. */ | |
96 | { "acr0", &builtin_type_int }, | |
97 | { "acr1", &builtin_type_int }, | |
98 | { "acr2", &builtin_type_int }, | |
99 | { "acr3", &builtin_type_int }, | |
100 | { "acr4", &builtin_type_int }, | |
101 | { "acr5", &builtin_type_int }, | |
102 | { "acr6", &builtin_type_int }, | |
103 | { "acr7", &builtin_type_int }, | |
104 | { "acr8", &builtin_type_int }, | |
105 | { "acr9", &builtin_type_int }, | |
106 | { "acr10", &builtin_type_int }, | |
107 | { "acr11", &builtin_type_int }, | |
108 | { "acr12", &builtin_type_int }, | |
109 | { "acr13", &builtin_type_int }, | |
110 | { "acr14", &builtin_type_int }, | |
111 | { "acr15", &builtin_type_int }, | |
112 | ||
113 | /* Floating Point Control Word. */ | |
114 | { "fpc", &builtin_type_int }, | |
115 | ||
116 | /* Floating Point Registers. */ | |
117 | { "f0", &builtin_type_double }, | |
118 | { "f1", &builtin_type_double }, | |
119 | { "f2", &builtin_type_double }, | |
120 | { "f3", &builtin_type_double }, | |
121 | { "f4", &builtin_type_double }, | |
122 | { "f5", &builtin_type_double }, | |
123 | { "f6", &builtin_type_double }, | |
124 | { "f7", &builtin_type_double }, | |
125 | { "f8", &builtin_type_double }, | |
126 | { "f9", &builtin_type_double }, | |
127 | { "f10", &builtin_type_double }, | |
128 | { "f11", &builtin_type_double }, | |
129 | { "f12", &builtin_type_double }, | |
130 | { "f13", &builtin_type_double }, | |
131 | { "f14", &builtin_type_double }, | |
132 | { "f15", &builtin_type_double }, | |
133 | ||
134 | /* Pseudo registers. */ | |
135 | { "pc", &builtin_type_void_func_ptr }, | |
136 | { "cc", &builtin_type_int }, | |
137 | }; | |
138 | ||
139 | /* Return the name of register REGNUM. */ | |
140 | static const char * | |
141 | s390_register_name (int regnum) | |
142 | { | |
143 | gdb_assert (regnum >= 0 && regnum < S390_NUM_TOTAL_REGS); | |
144 | return s390_register_info[regnum].name; | |
145 | } | |
146 | ||
147 | /* Return the GDB type object for the "standard" data type of data in | |
148 | register REGNUM. */ | |
149 | static struct type * | |
150 | s390_register_type (struct gdbarch *gdbarch, int regnum) | |
151 | { | |
152 | gdb_assert (regnum >= 0 && regnum < S390_NUM_TOTAL_REGS); | |
153 | return *s390_register_info[regnum].type; | |
5769d3cd AC |
154 | } |
155 | ||
d0f54f9d JB |
156 | /* DWARF Register Mapping. */ |
157 | ||
158 | static int s390_dwarf_regmap[] = | |
159 | { | |
160 | /* General Purpose Registers. */ | |
161 | S390_R0_REGNUM, S390_R1_REGNUM, S390_R2_REGNUM, S390_R3_REGNUM, | |
162 | S390_R4_REGNUM, S390_R5_REGNUM, S390_R6_REGNUM, S390_R7_REGNUM, | |
163 | S390_R8_REGNUM, S390_R9_REGNUM, S390_R10_REGNUM, S390_R11_REGNUM, | |
164 | S390_R12_REGNUM, S390_R13_REGNUM, S390_R14_REGNUM, S390_R15_REGNUM, | |
165 | ||
166 | /* Floating Point Registers. */ | |
167 | S390_F0_REGNUM, S390_F2_REGNUM, S390_F4_REGNUM, S390_F6_REGNUM, | |
168 | S390_F1_REGNUM, S390_F3_REGNUM, S390_F5_REGNUM, S390_F7_REGNUM, | |
169 | S390_F8_REGNUM, S390_F10_REGNUM, S390_F12_REGNUM, S390_F14_REGNUM, | |
170 | S390_F9_REGNUM, S390_F11_REGNUM, S390_F13_REGNUM, S390_F15_REGNUM, | |
171 | ||
172 | /* Control Registers (not mapped). */ | |
173 | -1, -1, -1, -1, -1, -1, -1, -1, | |
174 | -1, -1, -1, -1, -1, -1, -1, -1, | |
175 | ||
176 | /* Access Registers. */ | |
177 | S390_A0_REGNUM, S390_A1_REGNUM, S390_A2_REGNUM, S390_A3_REGNUM, | |
178 | S390_A4_REGNUM, S390_A5_REGNUM, S390_A6_REGNUM, S390_A7_REGNUM, | |
179 | S390_A8_REGNUM, S390_A9_REGNUM, S390_A10_REGNUM, S390_A11_REGNUM, | |
180 | S390_A12_REGNUM, S390_A13_REGNUM, S390_A14_REGNUM, S390_A15_REGNUM, | |
181 | ||
182 | /* Program Status Word. */ | |
183 | S390_PSWM_REGNUM, | |
184 | S390_PSWA_REGNUM | |
185 | }; | |
186 | ||
187 | /* Convert DWARF register number REG to the appropriate register | |
188 | number used by GDB. */ | |
a78f21af | 189 | static int |
d0f54f9d JB |
190 | s390_dwarf_reg_to_regnum (int reg) |
191 | { | |
192 | int regnum = -1; | |
193 | ||
194 | if (reg >= 0 || reg < ARRAY_SIZE (s390_dwarf_regmap)) | |
195 | regnum = s390_dwarf_regmap[reg]; | |
196 | ||
197 | if (regnum == -1) | |
198 | warning ("Unmapped DWARF Register #%d encountered\n", reg); | |
199 | ||
200 | return regnum; | |
201 | } | |
202 | ||
203 | /* Pseudo registers - PC and condition code. */ | |
204 | ||
205 | static void | |
206 | s390_pseudo_register_read (struct gdbarch *gdbarch, struct regcache *regcache, | |
207 | int regnum, void *buf) | |
208 | { | |
209 | ULONGEST val; | |
210 | ||
211 | switch (regnum) | |
212 | { | |
213 | case S390_PC_REGNUM: | |
214 | regcache_raw_read_unsigned (regcache, S390_PSWA_REGNUM, &val); | |
215 | store_unsigned_integer (buf, 4, val & 0x7fffffff); | |
216 | break; | |
217 | ||
218 | case S390_CC_REGNUM: | |
219 | regcache_raw_read_unsigned (regcache, S390_PSWM_REGNUM, &val); | |
220 | store_unsigned_integer (buf, 4, (val >> 12) & 3); | |
221 | break; | |
222 | ||
223 | default: | |
224 | internal_error (__FILE__, __LINE__, "invalid regnum"); | |
225 | } | |
226 | } | |
227 | ||
228 | static void | |
229 | s390_pseudo_register_write (struct gdbarch *gdbarch, struct regcache *regcache, | |
230 | int regnum, const void *buf) | |
5769d3cd | 231 | { |
d0f54f9d JB |
232 | ULONGEST val, psw; |
233 | ||
234 | switch (regnum) | |
235 | { | |
236 | case S390_PC_REGNUM: | |
237 | val = extract_unsigned_integer (buf, 4); | |
238 | regcache_raw_read_unsigned (regcache, S390_PSWA_REGNUM, &psw); | |
239 | psw = (psw & 0x80000000) | (val & 0x7fffffff); | |
240 | regcache_raw_write_unsigned (regcache, S390_PSWA_REGNUM, psw); | |
241 | break; | |
242 | ||
243 | case S390_CC_REGNUM: | |
244 | val = extract_unsigned_integer (buf, 4); | |
245 | regcache_raw_read_unsigned (regcache, S390_PSWM_REGNUM, &psw); | |
246 | psw = (psw & ~((ULONGEST)3 << 12)) | ((val & 3) << 12); | |
247 | regcache_raw_write_unsigned (regcache, S390_PSWM_REGNUM, psw); | |
248 | break; | |
249 | ||
250 | default: | |
251 | internal_error (__FILE__, __LINE__, "invalid regnum"); | |
252 | } | |
5769d3cd AC |
253 | } |
254 | ||
d0f54f9d JB |
255 | static void |
256 | s390x_pseudo_register_read (struct gdbarch *gdbarch, struct regcache *regcache, | |
257 | int regnum, void *buf) | |
258 | { | |
259 | ULONGEST val; | |
260 | ||
261 | switch (regnum) | |
262 | { | |
263 | case S390_PC_REGNUM: | |
264 | regcache_raw_read (regcache, S390_PSWA_REGNUM, buf); | |
265 | break; | |
266 | ||
267 | case S390_CC_REGNUM: | |
268 | regcache_raw_read_unsigned (regcache, S390_PSWM_REGNUM, &val); | |
269 | store_unsigned_integer (buf, 4, (val >> 44) & 3); | |
270 | break; | |
271 | ||
272 | default: | |
273 | internal_error (__FILE__, __LINE__, "invalid regnum"); | |
274 | } | |
275 | } | |
276 | ||
277 | static void | |
278 | s390x_pseudo_register_write (struct gdbarch *gdbarch, struct regcache *regcache, | |
279 | int regnum, const void *buf) | |
280 | { | |
281 | ULONGEST val, psw; | |
282 | ||
283 | switch (regnum) | |
284 | { | |
285 | case S390_PC_REGNUM: | |
286 | regcache_raw_write (regcache, S390_PSWA_REGNUM, buf); | |
287 | break; | |
288 | ||
289 | case S390_CC_REGNUM: | |
290 | val = extract_unsigned_integer (buf, 4); | |
291 | regcache_raw_read_unsigned (regcache, S390_PSWM_REGNUM, &psw); | |
292 | psw = (psw & ~((ULONGEST)3 << 44)) | ((val & 3) << 44); | |
293 | regcache_raw_write_unsigned (regcache, S390_PSWM_REGNUM, psw); | |
294 | break; | |
295 | ||
296 | default: | |
297 | internal_error (__FILE__, __LINE__, "invalid regnum"); | |
298 | } | |
299 | } | |
300 | ||
301 | /* 'float' values are stored in the upper half of floating-point | |
302 | registers, even though we are otherwise a big-endian platform. */ | |
303 | ||
a78f21af | 304 | static int |
d0f54f9d | 305 | s390_convert_register_p (int regno, struct type *type) |
5769d3cd | 306 | { |
d0f54f9d JB |
307 | return (regno >= S390_F0_REGNUM && regno <= S390_F15_REGNUM) |
308 | && TYPE_LENGTH (type) < 8; | |
5769d3cd AC |
309 | } |
310 | ||
d0f54f9d JB |
311 | static void |
312 | s390_register_to_value (struct frame_info *frame, int regnum, | |
313 | struct type *valtype, void *out) | |
314 | { | |
315 | char in[8]; | |
316 | int len = TYPE_LENGTH (valtype); | |
317 | gdb_assert (len < 8); | |
318 | ||
319 | get_frame_register (frame, regnum, in); | |
320 | memcpy (out, in, len); | |
321 | } | |
322 | ||
323 | static void | |
324 | s390_value_to_register (struct frame_info *frame, int regnum, | |
325 | struct type *valtype, const void *in) | |
326 | { | |
327 | char out[8]; | |
328 | int len = TYPE_LENGTH (valtype); | |
329 | gdb_assert (len < 8); | |
330 | ||
331 | memset (out, 0, 8); | |
332 | memcpy (out, in, len); | |
333 | put_frame_register (frame, regnum, out); | |
334 | } | |
335 | ||
336 | /* Register groups. */ | |
337 | ||
a78f21af | 338 | static int |
d0f54f9d JB |
339 | s390_register_reggroup_p (struct gdbarch *gdbarch, int regnum, |
340 | struct reggroup *group) | |
341 | { | |
342 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
343 | ||
344 | /* Registers displayed via 'info regs'. */ | |
345 | if (group == general_reggroup) | |
346 | return (regnum >= S390_R0_REGNUM && regnum <= S390_R15_REGNUM) | |
347 | || regnum == S390_PC_REGNUM | |
348 | || regnum == S390_CC_REGNUM; | |
349 | ||
350 | /* Registers displayed via 'info float'. */ | |
351 | if (group == float_reggroup) | |
352 | return (regnum >= S390_F0_REGNUM && regnum <= S390_F15_REGNUM) | |
353 | || regnum == S390_FPC_REGNUM; | |
354 | ||
355 | /* Registers that need to be saved/restored in order to | |
356 | push or pop frames. */ | |
357 | if (group == save_reggroup || group == restore_reggroup) | |
358 | return regnum != S390_PSWM_REGNUM && regnum != S390_PSWA_REGNUM; | |
359 | ||
360 | return default_register_reggroup_p (gdbarch, regnum, group); | |
361 | } | |
362 | ||
363 | ||
364 | /* Core file register sets. */ | |
365 | ||
366 | int s390_regmap_gregset[S390_NUM_REGS] = | |
367 | { | |
368 | /* Program Status Word. */ | |
369 | 0x00, 0x04, | |
370 | /* General Purpose Registers. */ | |
371 | 0x08, 0x0c, 0x10, 0x14, | |
372 | 0x18, 0x1c, 0x20, 0x24, | |
373 | 0x28, 0x2c, 0x30, 0x34, | |
374 | 0x38, 0x3c, 0x40, 0x44, | |
375 | /* Access Registers. */ | |
376 | 0x48, 0x4c, 0x50, 0x54, | |
377 | 0x58, 0x5c, 0x60, 0x64, | |
378 | 0x68, 0x6c, 0x70, 0x74, | |
379 | 0x78, 0x7c, 0x80, 0x84, | |
380 | /* Floating Point Control Word. */ | |
381 | -1, | |
382 | /* Floating Point Registers. */ | |
383 | -1, -1, -1, -1, -1, -1, -1, -1, | |
384 | -1, -1, -1, -1, -1, -1, -1, -1, | |
385 | }; | |
386 | ||
387 | int s390x_regmap_gregset[S390_NUM_REGS] = | |
388 | { | |
389 | 0x00, 0x08, | |
390 | /* General Purpose Registers. */ | |
391 | 0x10, 0x18, 0x20, 0x28, | |
392 | 0x30, 0x38, 0x40, 0x48, | |
393 | 0x50, 0x58, 0x60, 0x68, | |
394 | 0x70, 0x78, 0x80, 0x88, | |
395 | /* Access Registers. */ | |
396 | 0x90, 0x94, 0x98, 0x9c, | |
397 | 0xa0, 0xa4, 0xa8, 0xac, | |
398 | 0xb0, 0xb4, 0xb8, 0xbc, | |
399 | 0xc0, 0xc4, 0xc8, 0xcc, | |
400 | /* Floating Point Control Word. */ | |
401 | -1, | |
402 | /* Floating Point Registers. */ | |
403 | -1, -1, -1, -1, -1, -1, -1, -1, | |
404 | -1, -1, -1, -1, -1, -1, -1, -1, | |
405 | }; | |
406 | ||
407 | int s390_regmap_fpregset[S390_NUM_REGS] = | |
408 | { | |
409 | /* Program Status Word. */ | |
410 | -1, -1, | |
411 | /* General Purpose Registers. */ | |
412 | -1, -1, -1, -1, -1, -1, -1, -1, | |
413 | -1, -1, -1, -1, -1, -1, -1, -1, | |
414 | /* Access Registers. */ | |
415 | -1, -1, -1, -1, -1, -1, -1, -1, | |
416 | -1, -1, -1, -1, -1, -1, -1, -1, | |
417 | /* Floating Point Control Word. */ | |
418 | 0x00, | |
419 | /* Floating Point Registers. */ | |
420 | 0x08, 0x10, 0x18, 0x20, | |
421 | 0x28, 0x30, 0x38, 0x40, | |
422 | 0x48, 0x50, 0x58, 0x60, | |
423 | 0x68, 0x70, 0x78, 0x80, | |
424 | }; | |
425 | ||
426 | /* Supply register REGNUM from the register set REGSET to register cache | |
427 | REGCACHE. If REGNUM is -1, do this for all registers in REGSET. */ | |
428 | static void | |
429 | s390_supply_regset (const struct regset *regset, struct regcache *regcache, | |
430 | int regnum, const void *regs, size_t len) | |
431 | { | |
432 | const int *offset = regset->descr; | |
433 | int i; | |
434 | ||
435 | for (i = 0; i < S390_NUM_REGS; i++) | |
436 | { | |
437 | if ((regnum == i || regnum == -1) && offset[i] != -1) | |
438 | regcache_raw_supply (regcache, i, (const char *)regs + offset[i]); | |
439 | } | |
440 | } | |
441 | ||
442 | static const struct regset s390_gregset = { | |
443 | s390_regmap_gregset, | |
444 | s390_supply_regset | |
445 | }; | |
446 | ||
447 | static const struct regset s390x_gregset = { | |
448 | s390x_regmap_gregset, | |
449 | s390_supply_regset | |
450 | }; | |
451 | ||
452 | static const struct regset s390_fpregset = { | |
453 | s390_regmap_fpregset, | |
454 | s390_supply_regset | |
455 | }; | |
456 | ||
457 | /* Return the appropriate register set for the core section identified | |
458 | by SECT_NAME and SECT_SIZE. */ | |
459 | const struct regset * | |
460 | s390_regset_from_core_section (struct gdbarch *gdbarch, | |
461 | const char *sect_name, size_t sect_size) | |
462 | { | |
463 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
464 | ||
465 | if (strcmp (sect_name, ".reg") == 0 && sect_size == tdep->sizeof_gregset) | |
466 | return tdep->gregset; | |
467 | ||
468 | if (strcmp (sect_name, ".reg2") == 0 && sect_size == tdep->sizeof_fpregset) | |
469 | return tdep->fpregset; | |
470 | ||
471 | return NULL; | |
5769d3cd AC |
472 | } |
473 | ||
d0f54f9d JB |
474 | |
475 | #define GDB_TARGET_IS_ESAME (TARGET_ARCHITECTURE->mach == bfd_mach_s390_64) | |
476 | #define S390_GPR_SIZE (GDB_TARGET_IS_ESAME ? 8 : 4) | |
477 | #define S390_FPR_SIZE (8) | |
5769d3cd AC |
478 | #define S390_MAX_INSTR_SIZE (6) |
479 | #define S390_SYSCALL_OPCODE (0x0a) | |
480 | #define S390_SYSCALL_SIZE (2) | |
481 | #define S390_SIGCONTEXT_SREGS_OFFSET (8) | |
482 | #define S390X_SIGCONTEXT_SREGS_OFFSET (8) | |
483 | #define S390_SIGREGS_FP0_OFFSET (144) | |
484 | #define S390X_SIGREGS_FP0_OFFSET (216) | |
485 | #define S390_UC_MCONTEXT_OFFSET (256) | |
486 | #define S390X_UC_MCONTEXT_OFFSET (344) | |
5769d3cd AC |
487 | #define S390_SIGNAL_FRAMESIZE (GDB_TARGET_IS_ESAME ? 160:96) |
488 | #define s390_NR_sigreturn 119 | |
489 | #define s390_NR_rt_sigreturn 173 | |
490 | ||
491 | ||
492 | ||
493 | struct frame_extra_info | |
494 | { | |
495 | int initialised; | |
496 | int good_prologue; | |
497 | CORE_ADDR function_start; | |
498 | CORE_ADDR skip_prologue_function_start; | |
499 | CORE_ADDR saved_pc_valid; | |
500 | CORE_ADDR saved_pc; | |
501 | CORE_ADDR sig_fixed_saved_pc_valid; | |
502 | CORE_ADDR sig_fixed_saved_pc; | |
503 | CORE_ADDR frame_pointer_saved_pc; /* frame pointer needed for alloca */ | |
a9dd42f1 | 504 | CORE_ADDR stack_bought_valid; |
5769d3cd AC |
505 | CORE_ADDR stack_bought; /* amount we decrement the stack pointer by */ |
506 | CORE_ADDR sigcontext; | |
507 | }; | |
508 | ||
509 | ||
510 | static CORE_ADDR s390_frame_saved_pc_nofix (struct frame_info *fi); | |
511 | ||
a78f21af | 512 | static int |
a788de9b | 513 | s390_readinstruction (bfd_byte instr[], CORE_ADDR at) |
5769d3cd AC |
514 | { |
515 | int instrlen; | |
516 | ||
517 | static int s390_instrlen[] = { | |
518 | 2, | |
519 | 4, | |
520 | 4, | |
521 | 6 | |
522 | }; | |
a788de9b | 523 | if (target_read_memory (at, &instr[0], 2)) |
5769d3cd AC |
524 | return -1; |
525 | instrlen = s390_instrlen[instr[0] >> 6]; | |
c5e243bb JB |
526 | if (instrlen > 2) |
527 | { | |
a788de9b | 528 | if (target_read_memory (at + 2, &instr[2], instrlen - 2)) |
c5e243bb JB |
529 | return -1; |
530 | } | |
5769d3cd AC |
531 | return instrlen; |
532 | } | |
533 | ||
534 | static void | |
535 | s390_memset_extra_info (struct frame_extra_info *fextra_info) | |
536 | { | |
537 | memset (fextra_info, 0, sizeof (struct frame_extra_info)); | |
538 | } | |
539 | ||
540 | ||
4bc8c588 JB |
541 | /* Prologue analysis. */ |
542 | ||
543 | /* When we analyze a prologue, we're really doing 'abstract | |
544 | interpretation' or 'pseudo-evaluation': running the function's code | |
545 | in simulation, but using conservative approximations of the values | |
546 | it would have when it actually runs. For example, if our function | |
547 | starts with the instruction: | |
548 | ||
549 | ahi r1, 42 # add halfword immediate 42 to r1 | |
550 | ||
551 | we don't know exactly what value will be in r1 after executing this | |
552 | instruction, but we do know it'll be 42 greater than its original | |
553 | value. | |
554 | ||
555 | If we then see an instruction like: | |
556 | ||
557 | ahi r1, 22 # add halfword immediate 22 to r1 | |
558 | ||
559 | we still don't know what r1's value is, but again, we can say it is | |
560 | now 64 greater than its original value. | |
561 | ||
562 | If the next instruction were: | |
563 | ||
564 | lr r2, r1 # set r2 to r1's value | |
565 | ||
566 | then we can say that r2's value is now the original value of r1 | |
567 | plus 64. And so on. | |
568 | ||
569 | Of course, this can only go so far before it gets unreasonable. If | |
570 | we wanted to be able to say anything about the value of r1 after | |
571 | the instruction: | |
572 | ||
573 | xr r1, r3 # exclusive-or r1 and r3, place result in r1 | |
574 | ||
575 | then things would get pretty complex. But remember, we're just | |
576 | doing a conservative approximation; if exclusive-or instructions | |
577 | aren't relevant to prologues, we can just say r1's value is now | |
578 | 'unknown'. We can ignore things that are too complex, if that loss | |
579 | of information is acceptable for our application. | |
580 | ||
581 | Once you've reached an instruction that you don't know how to | |
582 | simulate, you stop. Now you examine the state of the registers and | |
583 | stack slots you've kept track of. For example: | |
584 | ||
585 | - To see how large your stack frame is, just check the value of sp; | |
586 | if it's the original value of sp minus a constant, then that | |
587 | constant is the stack frame's size. If the sp's value has been | |
588 | marked as 'unknown', then that means the prologue has done | |
589 | something too complex for us to track, and we don't know the | |
590 | frame size. | |
591 | ||
592 | - To see whether we've saved the SP in the current frame's back | |
593 | chain slot, we just check whether the current value of the back | |
594 | chain stack slot is the original value of the sp. | |
595 | ||
596 | Sure, this takes some work. But prologue analyzers aren't | |
597 | quick-and-simple pattern patching to recognize a few fixed prologue | |
598 | forms any more; they're big, hairy functions. Along with inferior | |
599 | function calls, prologue analysis accounts for a substantial | |
600 | portion of the time needed to stabilize a GDB port. So I think | |
601 | it's worthwhile to look for an approach that will be easier to | |
602 | understand and maintain. In the approach used here: | |
603 | ||
604 | - It's easier to see that the analyzer is correct: you just see | |
605 | whether the analyzer properly (albiet conservatively) simulates | |
606 | the effect of each instruction. | |
607 | ||
608 | - It's easier to extend the analyzer: you can add support for new | |
609 | instructions, and know that you haven't broken anything that | |
610 | wasn't already broken before. | |
611 | ||
612 | - It's orthogonal: to gather new information, you don't need to | |
613 | complicate the code for each instruction. As long as your domain | |
614 | of conservative values is already detailed enough to tell you | |
615 | what you need, then all the existing instruction simulations are | |
616 | already gathering the right data for you. | |
617 | ||
618 | A 'struct prologue_value' is a conservative approximation of the | |
619 | real value the register or stack slot will have. */ | |
620 | ||
621 | struct prologue_value { | |
622 | ||
623 | /* What sort of value is this? This determines the interpretation | |
624 | of subsequent fields. */ | |
625 | enum { | |
626 | ||
627 | /* We don't know anything about the value. This is also used for | |
628 | values we could have kept track of, when doing so would have | |
629 | been too complex and we don't want to bother. The bottom of | |
630 | our lattice. */ | |
631 | pv_unknown, | |
632 | ||
633 | /* A known constant. K is its value. */ | |
634 | pv_constant, | |
635 | ||
636 | /* The value that register REG originally had *UPON ENTRY TO THE | |
637 | FUNCTION*, plus K. If K is zero, this means, obviously, just | |
638 | the value REG had upon entry to the function. REG is a GDB | |
639 | register number. Before we start interpreting, we initialize | |
640 | every register R to { pv_register, R, 0 }. */ | |
641 | pv_register, | |
642 | ||
643 | } kind; | |
644 | ||
645 | /* The meanings of the following fields depend on 'kind'; see the | |
646 | comments for the specific 'kind' values. */ | |
647 | int reg; | |
648 | CORE_ADDR k; | |
649 | }; | |
650 | ||
651 | ||
652 | /* Set V to be unknown. */ | |
653 | static void | |
654 | pv_set_to_unknown (struct prologue_value *v) | |
655 | { | |
656 | v->kind = pv_unknown; | |
657 | } | |
658 | ||
659 | ||
660 | /* Set V to the constant K. */ | |
661 | static void | |
662 | pv_set_to_constant (struct prologue_value *v, CORE_ADDR k) | |
663 | { | |
664 | v->kind = pv_constant; | |
665 | v->k = k; | |
666 | } | |
667 | ||
668 | ||
669 | /* Set V to the original value of register REG, plus K. */ | |
670 | static void | |
671 | pv_set_to_register (struct prologue_value *v, int reg, CORE_ADDR k) | |
672 | { | |
673 | v->kind = pv_register; | |
674 | v->reg = reg; | |
675 | v->k = k; | |
676 | } | |
677 | ||
678 | ||
679 | /* If one of *A and *B is a constant, and the other isn't, swap the | |
680 | pointers as necessary to ensure that *B points to the constant. | |
681 | This can reduce the number of cases we need to analyze in the | |
682 | functions below. */ | |
683 | static void | |
684 | pv_constant_last (struct prologue_value **a, | |
685 | struct prologue_value **b) | |
686 | { | |
687 | if ((*a)->kind == pv_constant | |
688 | && (*b)->kind != pv_constant) | |
689 | { | |
690 | struct prologue_value *temp = *a; | |
691 | *a = *b; | |
692 | *b = temp; | |
693 | } | |
694 | } | |
695 | ||
696 | ||
697 | /* Set SUM to the sum of A and B. SUM, A, and B may point to the same | |
698 | 'struct prologue_value' object. */ | |
699 | static void | |
700 | pv_add (struct prologue_value *sum, | |
701 | struct prologue_value *a, | |
702 | struct prologue_value *b) | |
703 | { | |
704 | pv_constant_last (&a, &b); | |
705 | ||
706 | /* We can handle adding constants to registers, and other constants. */ | |
707 | if (b->kind == pv_constant | |
708 | && (a->kind == pv_register | |
709 | || a->kind == pv_constant)) | |
710 | { | |
711 | sum->kind = a->kind; | |
712 | sum->reg = a->reg; /* not meaningful if a is pv_constant, but | |
713 | harmless */ | |
714 | sum->k = a->k + b->k; | |
715 | } | |
716 | ||
717 | /* Anything else we don't know how to add. We don't have a | |
718 | representation for, say, the sum of two registers, or a multiple | |
719 | of a register's value (adding a register to itself). */ | |
720 | else | |
721 | sum->kind = pv_unknown; | |
722 | } | |
723 | ||
724 | ||
725 | /* Add the constant K to V. */ | |
726 | static void | |
727 | pv_add_constant (struct prologue_value *v, CORE_ADDR k) | |
728 | { | |
729 | struct prologue_value pv_k; | |
730 | ||
731 | /* Rather than thinking of all the cases we can and can't handle, | |
732 | we'll just let pv_add take care of that for us. */ | |
733 | pv_set_to_constant (&pv_k, k); | |
734 | pv_add (v, v, &pv_k); | |
735 | } | |
736 | ||
737 | ||
738 | /* Subtract B from A, and put the result in DIFF. | |
739 | ||
740 | This isn't quite the same as negating B and adding it to A, since | |
741 | we don't have a representation for the negation of anything but a | |
742 | constant. For example, we can't negate { pv_register, R1, 10 }, | |
743 | but we do know that { pv_register, R1, 10 } minus { pv_register, | |
744 | R1, 5 } is { pv_constant, <ignored>, 5 }. | |
745 | ||
746 | This means, for example, that we can subtract two stack addresses; | |
747 | they're both relative to the original SP. Since the frame pointer | |
748 | is set based on the SP, its value will be the original SP plus some | |
749 | constant (probably zero), so we can use its value just fine. */ | |
750 | static void | |
751 | pv_subtract (struct prologue_value *diff, | |
752 | struct prologue_value *a, | |
753 | struct prologue_value *b) | |
754 | { | |
755 | pv_constant_last (&a, &b); | |
756 | ||
757 | /* We can subtract a constant from another constant, or from a | |
758 | register. */ | |
759 | if (b->kind == pv_constant | |
760 | && (a->kind == pv_register | |
761 | || a->kind == pv_constant)) | |
762 | { | |
763 | diff->kind = a->kind; | |
764 | diff->reg = a->reg; /* not always meaningful, but harmless */ | |
765 | diff->k = a->k - b->k; | |
766 | } | |
767 | ||
768 | /* We can subtract a register from itself, yielding a constant. */ | |
769 | else if (a->kind == pv_register | |
770 | && b->kind == pv_register | |
771 | && a->reg == b->reg) | |
772 | { | |
773 | diff->kind = pv_constant; | |
774 | diff->k = a->k - b->k; | |
775 | } | |
776 | ||
777 | /* We don't know how to subtract anything else. */ | |
778 | else | |
779 | diff->kind = pv_unknown; | |
780 | } | |
781 | ||
782 | ||
783 | /* Set AND to the logical and of A and B. */ | |
784 | static void | |
785 | pv_logical_and (struct prologue_value *and, | |
786 | struct prologue_value *a, | |
787 | struct prologue_value *b) | |
788 | { | |
789 | pv_constant_last (&a, &b); | |
790 | ||
791 | /* We can 'and' two constants. */ | |
792 | if (a->kind == pv_constant | |
793 | && b->kind == pv_constant) | |
794 | { | |
795 | and->kind = pv_constant; | |
796 | and->k = a->k & b->k; | |
797 | } | |
798 | ||
799 | /* We can 'and' anything with the constant zero. */ | |
800 | else if (b->kind == pv_constant | |
801 | && b->k == 0) | |
802 | { | |
803 | and->kind = pv_constant; | |
804 | and->k = 0; | |
805 | } | |
806 | ||
807 | /* We can 'and' anything with ~0. */ | |
808 | else if (b->kind == pv_constant | |
809 | && b->k == ~ (CORE_ADDR) 0) | |
810 | *and = *a; | |
811 | ||
812 | /* We can 'and' a register with itself. */ | |
813 | else if (a->kind == pv_register | |
814 | && b->kind == pv_register | |
815 | && a->reg == b->reg | |
816 | && a->k == b->k) | |
817 | *and = *a; | |
818 | ||
819 | /* Otherwise, we don't know. */ | |
820 | else | |
821 | pv_set_to_unknown (and); | |
822 | } | |
823 | ||
824 | ||
825 | /* Return non-zero iff A and B are identical expressions. | |
826 | ||
827 | This is not the same as asking if the two values are equal; the | |
828 | result of such a comparison would have to be a pv_boolean, and | |
829 | asking whether two 'unknown' values were equal would give you | |
830 | pv_maybe. Same for comparing, say, { pv_register, R1, 0 } and { | |
831 | pv_register, R2, 0}. Instead, this is asking whether the two | |
832 | representations are the same. */ | |
12bffad7 | 833 | static int |
4bc8c588 JB |
834 | pv_is_identical (struct prologue_value *a, |
835 | struct prologue_value *b) | |
12bffad7 | 836 | { |
4bc8c588 JB |
837 | if (a->kind != b->kind) |
838 | return 0; | |
839 | ||
840 | switch (a->kind) | |
841 | { | |
842 | case pv_unknown: | |
843 | return 1; | |
844 | case pv_constant: | |
845 | return (a->k == b->k); | |
846 | case pv_register: | |
847 | return (a->reg == b->reg && a->k == b->k); | |
848 | default: | |
849 | gdb_assert (0); | |
850 | } | |
12bffad7 JB |
851 | } |
852 | ||
5769d3cd | 853 | |
4bc8c588 JB |
854 | /* Return non-zero if A is the original value of register number R |
855 | plus K, zero otherwise. */ | |
856 | static int | |
857 | pv_is_register (struct prologue_value *a, int r, CORE_ADDR k) | |
858 | { | |
859 | return (a->kind == pv_register | |
860 | && a->reg == r | |
861 | && a->k == k); | |
862 | } | |
5769d3cd | 863 | |
5769d3cd | 864 | |
4bc8c588 JB |
865 | /* A prologue-value-esque boolean type, including "maybe", when we |
866 | can't figure out whether something is true or not. */ | |
867 | enum pv_boolean { | |
868 | pv_maybe, | |
869 | pv_definite_yes, | |
870 | pv_definite_no, | |
871 | }; | |
872 | ||
873 | ||
874 | /* Decide whether a reference to SIZE bytes at ADDR refers exactly to | |
875 | an element of an array. The array starts at ARRAY_ADDR, and has | |
876 | ARRAY_LEN values of ELT_SIZE bytes each. If ADDR definitely does | |
877 | refer to an array element, set *I to the index of the referenced | |
878 | element in the array, and return pv_definite_yes. If it definitely | |
879 | doesn't, return pv_definite_no. If we can't tell, return pv_maybe. | |
880 | ||
881 | If the reference does touch the array, but doesn't fall exactly on | |
882 | an element boundary, or doesn't refer to the whole element, return | |
883 | pv_maybe. */ | |
884 | static enum pv_boolean | |
885 | pv_is_array_ref (struct prologue_value *addr, | |
886 | CORE_ADDR size, | |
887 | struct prologue_value *array_addr, | |
888 | CORE_ADDR array_len, | |
889 | CORE_ADDR elt_size, | |
890 | int *i) | |
891 | { | |
892 | struct prologue_value offset; | |
5769d3cd | 893 | |
4bc8c588 JB |
894 | /* Note that, since ->k is a CORE_ADDR, and CORE_ADDR is unsigned, |
895 | if addr is *before* the start of the array, then this isn't going | |
896 | to be negative... */ | |
897 | pv_subtract (&offset, addr, array_addr); | |
898 | ||
899 | if (offset.kind == pv_constant) | |
900 | { | |
901 | /* This is a rather odd test. We want to know if the SIZE bytes | |
902 | at ADDR don't overlap the array at all, so you'd expect it to | |
903 | be an || expression: "if we're completely before || we're | |
904 | completely after". But with unsigned arithmetic, things are | |
905 | different: since it's a number circle, not a number line, the | |
906 | right values for offset.k are actually one contiguous range. */ | |
907 | if (offset.k <= -size | |
908 | && offset.k >= array_len * elt_size) | |
909 | return pv_definite_no; | |
910 | else if (offset.k % elt_size != 0 | |
911 | || size != elt_size) | |
912 | return pv_maybe; | |
913 | else | |
914 | { | |
915 | *i = offset.k / elt_size; | |
916 | return pv_definite_yes; | |
917 | } | |
918 | } | |
919 | else | |
920 | return pv_maybe; | |
921 | } | |
922 | ||
923 | ||
924 | ||
925 | /* Decoding S/390 instructions. */ | |
926 | ||
927 | /* Named opcode values for the S/390 instructions we recognize. Some | |
928 | instructions have their opcode split across two fields; those are the | |
929 | op1_* and op2_* enums. */ | |
930 | enum | |
931 | { | |
932 | op1_aghi = 0xa7, op2_aghi = 0xb, | |
933 | op1_ahi = 0xa7, op2_ahi = 0xa, | |
934 | op_ar = 0x1a, | |
935 | op_basr = 0x0d, | |
936 | op1_bras = 0xa7, op2_bras = 0x5, | |
937 | op_l = 0x58, | |
938 | op_la = 0x41, | |
939 | op1_larl = 0xc0, op2_larl = 0x0, | |
940 | op_lgr = 0xb904, | |
941 | op1_lghi = 0xa7, op2_lghi = 0x9, | |
942 | op1_lhi = 0xa7, op2_lhi = 0x8, | |
943 | op_lr = 0x18, | |
944 | op_nr = 0x14, | |
945 | op_ngr = 0xb980, | |
946 | op_s = 0x5b, | |
947 | op_st = 0x50, | |
948 | op_std = 0x60, | |
949 | op1_stg = 0xe3, op2_stg = 0x24, | |
950 | op_stm = 0x90, | |
951 | op1_stmg = 0xeb, op2_stmg = 0x24, | |
d0f54f9d JB |
952 | op_lm = 0x98, |
953 | op1_lmg = 0xeb, op2_lmg = 0x04, | |
4bc8c588 JB |
954 | op_svc = 0x0a, |
955 | }; | |
956 | ||
957 | ||
958 | /* The functions below are for recognizing and decoding S/390 | |
959 | instructions of various formats. Each of them checks whether INSN | |
960 | is an instruction of the given format, with the specified opcodes. | |
961 | If it is, it sets the remaining arguments to the values of the | |
962 | instruction's fields, and returns a non-zero value; otherwise, it | |
963 | returns zero. | |
964 | ||
965 | These functions' arguments appear in the order they appear in the | |
966 | instruction, not in the machine-language form. So, opcodes always | |
967 | come first, even though they're sometimes scattered around the | |
968 | instructions. And displacements appear before base and extension | |
969 | registers, as they do in the assembly syntax, not at the end, as | |
970 | they do in the machine language. */ | |
a78f21af | 971 | static int |
4bc8c588 JB |
972 | is_ri (bfd_byte *insn, int op1, int op2, unsigned int *r1, int *i2) |
973 | { | |
974 | if (insn[0] == op1 && (insn[1] & 0xf) == op2) | |
975 | { | |
976 | *r1 = (insn[1] >> 4) & 0xf; | |
977 | /* i2 is a 16-bit signed quantity. */ | |
978 | *i2 = (((insn[2] << 8) | insn[3]) ^ 0x8000) - 0x8000; | |
979 | return 1; | |
980 | } | |
981 | else | |
982 | return 0; | |
983 | } | |
8ac0e65a | 984 | |
5769d3cd | 985 | |
4bc8c588 JB |
986 | static int |
987 | is_ril (bfd_byte *insn, int op1, int op2, | |
988 | unsigned int *r1, int *i2) | |
989 | { | |
990 | if (insn[0] == op1 && (insn[1] & 0xf) == op2) | |
991 | { | |
992 | *r1 = (insn[1] >> 4) & 0xf; | |
993 | /* i2 is a signed quantity. If the host 'int' is 32 bits long, | |
994 | no sign extension is necessary, but we don't want to assume | |
995 | that. */ | |
996 | *i2 = (((insn[2] << 24) | |
997 | | (insn[3] << 16) | |
998 | | (insn[4] << 8) | |
999 | | (insn[5])) ^ 0x80000000) - 0x80000000; | |
1000 | return 1; | |
1001 | } | |
1002 | else | |
1003 | return 0; | |
1004 | } | |
1005 | ||
1006 | ||
1007 | static int | |
1008 | is_rr (bfd_byte *insn, int op, unsigned int *r1, unsigned int *r2) | |
1009 | { | |
1010 | if (insn[0] == op) | |
1011 | { | |
1012 | *r1 = (insn[1] >> 4) & 0xf; | |
1013 | *r2 = insn[1] & 0xf; | |
1014 | return 1; | |
1015 | } | |
1016 | else | |
1017 | return 0; | |
1018 | } | |
1019 | ||
1020 | ||
1021 | static int | |
1022 | is_rre (bfd_byte *insn, int op, unsigned int *r1, unsigned int *r2) | |
1023 | { | |
1024 | if (((insn[0] << 8) | insn[1]) == op) | |
1025 | { | |
1026 | /* Yes, insn[3]. insn[2] is unused in RRE format. */ | |
1027 | *r1 = (insn[3] >> 4) & 0xf; | |
1028 | *r2 = insn[3] & 0xf; | |
1029 | return 1; | |
1030 | } | |
1031 | else | |
1032 | return 0; | |
1033 | } | |
1034 | ||
1035 | ||
1036 | static int | |
1037 | is_rs (bfd_byte *insn, int op, | |
1038 | unsigned int *r1, unsigned int *r3, unsigned int *d2, unsigned int *b2) | |
1039 | { | |
1040 | if (insn[0] == op) | |
1041 | { | |
1042 | *r1 = (insn[1] >> 4) & 0xf; | |
1043 | *r3 = insn[1] & 0xf; | |
1044 | *b2 = (insn[2] >> 4) & 0xf; | |
1045 | *d2 = ((insn[2] & 0xf) << 8) | insn[3]; | |
1046 | return 1; | |
1047 | } | |
1048 | else | |
1049 | return 0; | |
1050 | } | |
1051 | ||
1052 | ||
1053 | static int | |
1054 | is_rse (bfd_byte *insn, int op1, int op2, | |
1055 | unsigned int *r1, unsigned int *r3, unsigned int *d2, unsigned int *b2) | |
1056 | { | |
1057 | if (insn[0] == op1 | |
1058 | /* Yes, insn[5]. insn[4] is unused. */ | |
1059 | && insn[5] == op2) | |
1060 | { | |
1061 | *r1 = (insn[1] >> 4) & 0xf; | |
1062 | *r3 = insn[1] & 0xf; | |
1063 | *b2 = (insn[2] >> 4) & 0xf; | |
1064 | *d2 = ((insn[2] & 0xf) << 8) | insn[3]; | |
1065 | return 1; | |
1066 | } | |
1067 | else | |
1068 | return 0; | |
1069 | } | |
1070 | ||
1071 | ||
1072 | static int | |
1073 | is_rx (bfd_byte *insn, int op, | |
1074 | unsigned int *r1, unsigned int *d2, unsigned int *x2, unsigned int *b2) | |
1075 | { | |
1076 | if (insn[0] == op) | |
1077 | { | |
1078 | *r1 = (insn[1] >> 4) & 0xf; | |
1079 | *x2 = insn[1] & 0xf; | |
1080 | *b2 = (insn[2] >> 4) & 0xf; | |
1081 | *d2 = ((insn[2] & 0xf) << 8) | insn[3]; | |
1082 | return 1; | |
1083 | } | |
1084 | else | |
1085 | return 0; | |
1086 | } | |
1087 | ||
1088 | ||
1089 | static int | |
1090 | is_rxe (bfd_byte *insn, int op1, int op2, | |
1091 | unsigned int *r1, unsigned int *d2, unsigned int *x2, unsigned int *b2) | |
1092 | { | |
1093 | if (insn[0] == op1 | |
1094 | /* Yes, insn[5]. insn[4] is unused. */ | |
1095 | && insn[5] == op2) | |
1096 | { | |
1097 | *r1 = (insn[1] >> 4) & 0xf; | |
1098 | *x2 = insn[1] & 0xf; | |
1099 | *b2 = (insn[2] >> 4) & 0xf; | |
1100 | *d2 = ((insn[2] & 0xf) << 8) | insn[3]; | |
1101 | return 1; | |
1102 | } | |
1103 | else | |
1104 | return 0; | |
1105 | } | |
1106 | ||
1107 | ||
1108 | /* Set ADDR to the effective address for an X-style instruction, like: | |
1109 | ||
1110 | L R1, D2(X2, B2) | |
1111 | ||
1112 | Here, X2 and B2 are registers, and D2 is an unsigned 12-bit | |
1113 | constant; the effective address is the sum of all three. If either | |
1114 | X2 or B2 are zero, then it doesn't contribute to the sum --- this | |
1115 | means that r0 can't be used as either X2 or B2. | |
1116 | ||
1117 | GPR is an array of general register values, indexed by GPR number, | |
1118 | not GDB register number. */ | |
1119 | static void | |
1120 | compute_x_addr (struct prologue_value *addr, | |
1121 | struct prologue_value *gpr, | |
1122 | unsigned int d2, unsigned int x2, unsigned int b2) | |
1123 | { | |
1124 | /* We can't just add stuff directly in addr; it might alias some of | |
1125 | the registers we need to read. */ | |
1126 | struct prologue_value result; | |
1127 | ||
1128 | pv_set_to_constant (&result, d2); | |
1129 | if (x2) | |
1130 | pv_add (&result, &result, &gpr[x2]); | |
1131 | if (b2) | |
1132 | pv_add (&result, &result, &gpr[b2]); | |
1133 | ||
1134 | *addr = result; | |
1135 | } | |
1136 | ||
1137 | ||
1138 | /* The number of GPR and FPR spill slots in an S/390 stack frame. We | |
1139 | track general-purpose registers r2 -- r15, and floating-point | |
1140 | registers f0, f2, f4, and f6. */ | |
1141 | #define S390_NUM_SPILL_SLOTS (14 + 4) | |
d0f54f9d JB |
1142 | #define S390_NUM_GPRS 16 |
1143 | #define S390_NUM_FPRS 16 | |
4bc8c588 JB |
1144 | |
1145 | ||
1146 | /* If the SIZE bytes at ADDR are a stack slot we're actually tracking, | |
1147 | return pv_definite_yes and set *STACK to point to the slot. If | |
1148 | we're sure that they are not any of our stack slots, then return | |
1149 | pv_definite_no. Otherwise, return pv_maybe. | |
1150 | - GPR is an array indexed by GPR number giving the current values | |
1151 | of the general-purpose registers. | |
1152 | - SPILL is an array tracking the spill area of the caller's frame; | |
1153 | SPILL[i] is the i'th spill slot. The spill slots are designated | |
1154 | for r2 -- r15, and then f0, f2, f4, and f6. | |
1155 | - BACK_CHAIN is the value of the back chain slot; it's only valid | |
1156 | when the current frame actually has some space for a back chain | |
1157 | slot --- that is, when the current value of the stack pointer | |
1158 | (according to GPR) is at least S390_STACK_FRAME_OVERHEAD bytes | |
1159 | less than its original value. */ | |
1160 | static enum pv_boolean | |
1161 | s390_on_stack (struct prologue_value *addr, | |
1162 | CORE_ADDR size, | |
1163 | struct prologue_value *gpr, | |
1164 | struct prologue_value *spill, | |
1165 | struct prologue_value *back_chain, | |
1166 | struct prologue_value **stack) | |
1167 | { | |
1168 | struct prologue_value gpr_spill_addr; | |
1169 | struct prologue_value fpr_spill_addr; | |
1170 | struct prologue_value back_chain_addr; | |
1171 | int i; | |
1172 | enum pv_boolean b; | |
1173 | ||
1174 | /* Construct the addresses of the spill arrays and the back chain. */ | |
1175 | pv_set_to_register (&gpr_spill_addr, S390_SP_REGNUM, 2 * S390_GPR_SIZE); | |
1176 | pv_set_to_register (&fpr_spill_addr, S390_SP_REGNUM, 16 * S390_GPR_SIZE); | |
d0f54f9d | 1177 | back_chain_addr = gpr[S390_SP_REGNUM - S390_R0_REGNUM]; |
4bc8c588 JB |
1178 | |
1179 | /* We have to check for GPR and FPR references using two separate | |
1180 | calls to pv_is_array_ref, since the GPR and FPR spill slots are | |
1181 | different sizes. (SPILL is an array, but the thing it tracks | |
1182 | isn't really an array.) */ | |
1183 | ||
1184 | /* Was it a reference to the GPR spill array? */ | |
1185 | b = pv_is_array_ref (addr, size, &gpr_spill_addr, 14, S390_GPR_SIZE, &i); | |
1186 | if (b == pv_definite_yes) | |
1187 | { | |
1188 | *stack = &spill[i]; | |
1189 | return pv_definite_yes; | |
1190 | } | |
1191 | if (b == pv_maybe) | |
1192 | return pv_maybe; | |
1193 | ||
1194 | /* Was it a reference to the FPR spill array? */ | |
1195 | b = pv_is_array_ref (addr, size, &fpr_spill_addr, 4, S390_FPR_SIZE, &i); | |
1196 | if (b == pv_definite_yes) | |
5769d3cd | 1197 | { |
4bc8c588 JB |
1198 | *stack = &spill[14 + i]; |
1199 | return pv_definite_yes; | |
5769d3cd | 1200 | } |
4bc8c588 JB |
1201 | if (b == pv_maybe) |
1202 | return pv_maybe; | |
1203 | ||
1204 | /* Was it a reference to the back chain? | |
1205 | This isn't quite right. We ought to check whether we have | |
1206 | actually allocated any new frame at all. */ | |
1207 | b = pv_is_array_ref (addr, size, &back_chain_addr, 1, S390_GPR_SIZE, &i); | |
1208 | if (b == pv_definite_yes) | |
5769d3cd | 1209 | { |
4bc8c588 JB |
1210 | *stack = back_chain; |
1211 | return pv_definite_yes; | |
1212 | } | |
1213 | if (b == pv_maybe) | |
1214 | return pv_maybe; | |
1215 | ||
1216 | /* All the above queries returned definite 'no's. */ | |
1217 | return pv_definite_no; | |
1218 | } | |
1219 | ||
1220 | ||
1221 | /* Do a SIZE-byte store of VALUE to ADDR. GPR, SPILL, and BACK_CHAIN, | |
1222 | and the return value are as described for s390_on_stack, above. | |
1223 | Note that, when this returns pv_maybe, we have to assume that all | |
1224 | of our memory now contains unknown values. */ | |
1225 | static enum pv_boolean | |
1226 | s390_store (struct prologue_value *addr, | |
1227 | CORE_ADDR size, | |
1228 | struct prologue_value *value, | |
1229 | struct prologue_value *gpr, | |
1230 | struct prologue_value *spill, | |
1231 | struct prologue_value *back_chain) | |
1232 | { | |
1233 | struct prologue_value *stack; | |
1234 | enum pv_boolean on_stack | |
1235 | = s390_on_stack (addr, size, gpr, spill, back_chain, &stack); | |
1236 | ||
1237 | if (on_stack == pv_definite_yes) | |
1238 | *stack = *value; | |
1239 | ||
1240 | return on_stack; | |
1241 | } | |
1242 | ||
1243 | ||
1244 | /* The current frame looks like a signal delivery frame: the first | |
1245 | instruction is an 'svc' opcode. If the next frame is a signal | |
1246 | handler's frame, set FI's saved register map to point into the | |
1247 | signal context structure. */ | |
1248 | static void | |
1249 | s390_get_signal_frame_info (struct frame_info *fi) | |
1250 | { | |
1251 | struct frame_info *next_frame = get_next_frame (fi); | |
1252 | ||
1253 | if (next_frame | |
1254 | && get_frame_extra_info (next_frame) | |
1255 | && get_frame_extra_info (next_frame)->sigcontext) | |
1256 | { | |
1257 | /* We're definitely backtracing from a signal handler. */ | |
1b1d3794 | 1258 | CORE_ADDR *saved_regs = deprecated_get_frame_saved_regs (fi); |
4bc8c588 | 1259 | CORE_ADDR save_reg_addr = (get_frame_extra_info (next_frame)->sigcontext |
d0f54f9d | 1260 | + DEPRECATED_REGISTER_BYTE (S390_R0_REGNUM)); |
4bc8c588 JB |
1261 | int reg; |
1262 | ||
1263 | for (reg = 0; reg < S390_NUM_GPRS; reg++) | |
7666f43c | 1264 | { |
d0f54f9d | 1265 | saved_regs[S390_R0_REGNUM + reg] = save_reg_addr; |
4bc8c588 | 1266 | save_reg_addr += S390_GPR_SIZE; |
7666f43c JB |
1267 | } |
1268 | ||
4bc8c588 JB |
1269 | save_reg_addr = (get_frame_extra_info (next_frame)->sigcontext |
1270 | + (GDB_TARGET_IS_ESAME ? S390X_SIGREGS_FP0_OFFSET : | |
1271 | S390_SIGREGS_FP0_OFFSET)); | |
1272 | for (reg = 0; reg < S390_NUM_FPRS; reg++) | |
1273 | { | |
d0f54f9d | 1274 | saved_regs[S390_F0_REGNUM + reg] = save_reg_addr; |
4bc8c588 JB |
1275 | save_reg_addr += S390_FPR_SIZE; |
1276 | } | |
5769d3cd | 1277 | } |
4bc8c588 JB |
1278 | } |
1279 | ||
1280 | ||
1281 | static int | |
1282 | s390_get_frame_info (CORE_ADDR start_pc, | |
1283 | struct frame_extra_info *fextra_info, | |
1284 | struct frame_info *fi, | |
1285 | int init_extra_info) | |
1286 | { | |
1287 | /* Our return value: | |
1288 | zero if we were able to read all the instructions we wanted, or | |
1289 | -1 if we got an error trying to read memory. */ | |
1290 | int result = 0; | |
1291 | ||
4bc8c588 JB |
1292 | /* The current PC for our abstract interpretation. */ |
1293 | CORE_ADDR pc; | |
1294 | ||
1295 | /* The address of the next instruction after that. */ | |
1296 | CORE_ADDR next_pc; | |
1297 | ||
1298 | /* The general-purpose registers. */ | |
1299 | struct prologue_value gpr[S390_NUM_GPRS]; | |
1300 | ||
1301 | /* The floating-point registers. */ | |
1302 | struct prologue_value fpr[S390_NUM_FPRS]; | |
1303 | ||
1304 | /* The register spill stack slots in the caller's frame --- | |
1305 | general-purpose registers r2 through r15, and floating-point | |
1306 | registers. spill[i] is where gpr i+2 gets spilled; | |
1307 | spill[(14, 15, 16, 17)] is where (f0, f2, f4, f6) get spilled. */ | |
1308 | struct prologue_value spill[S390_NUM_SPILL_SLOTS]; | |
1309 | ||
1310 | /* The value of the back chain slot. This is only valid if the stack | |
1311 | pointer is known to be less than its original value --- that is, | |
1312 | if we have indeed allocated space on the stack. */ | |
1313 | struct prologue_value back_chain; | |
1314 | ||
1315 | /* The address of the instruction after the last one that changed | |
1316 | the SP, FP, or back chain. */ | |
1317 | CORE_ADDR after_last_frame_setup_insn = start_pc; | |
1318 | ||
4bc8c588 JB |
1319 | /* Set up everything's initial value. */ |
1320 | { | |
1321 | int i; | |
1322 | ||
1323 | for (i = 0; i < S390_NUM_GPRS; i++) | |
d0f54f9d | 1324 | pv_set_to_register (&gpr[i], S390_R0_REGNUM + i, 0); |
4bc8c588 JB |
1325 | |
1326 | for (i = 0; i < S390_NUM_FPRS; i++) | |
d0f54f9d | 1327 | pv_set_to_register (&fpr[i], S390_F0_REGNUM + i, 0); |
4bc8c588 JB |
1328 | |
1329 | for (i = 0; i < S390_NUM_SPILL_SLOTS; i++) | |
1330 | pv_set_to_unknown (&spill[i]); | |
1331 | ||
1332 | pv_set_to_unknown (&back_chain); | |
1333 | } | |
1334 | ||
1335 | /* Start interpreting instructions, until we hit something we don't | |
1336 | know how to interpret. (Ideally, we should stop at the frame's | |
1337 | real current PC, but at the moment, our callers don't give us | |
1338 | that info.) */ | |
1339 | for (pc = start_pc; ; pc = next_pc) | |
5769d3cd | 1340 | { |
4bc8c588 | 1341 | bfd_byte insn[S390_MAX_INSTR_SIZE]; |
a788de9b | 1342 | int insn_len = s390_readinstruction (insn, pc); |
4bc8c588 JB |
1343 | |
1344 | /* Fields for various kinds of instructions. */ | |
1345 | unsigned int b2, r1, r2, d2, x2, r3; | |
1346 | int i2; | |
1347 | ||
1348 | /* The values of SP, FP, and back chain before this instruction, | |
1349 | for detecting instructions that change them. */ | |
1350 | struct prologue_value pre_insn_sp, pre_insn_fp, pre_insn_back_chain; | |
1351 | ||
1352 | /* If we got an error trying to read the instruction, report it. */ | |
1353 | if (insn_len < 0) | |
8ac0e65a | 1354 | { |
4bc8c588 JB |
1355 | result = -1; |
1356 | break; | |
1357 | } | |
1358 | ||
1359 | next_pc = pc + insn_len; | |
1360 | ||
d0f54f9d JB |
1361 | pre_insn_sp = gpr[S390_SP_REGNUM - S390_R0_REGNUM]; |
1362 | pre_insn_fp = gpr[S390_FRAME_REGNUM - S390_R0_REGNUM]; | |
4bc8c588 JB |
1363 | pre_insn_back_chain = back_chain; |
1364 | ||
1365 | /* A special case, first --- only recognized as the very first | |
1366 | instruction of the function, for signal delivery frames: | |
1367 | SVC i --- system call */ | |
1368 | if (pc == start_pc | |
1369 | && is_rr (insn, op_svc, &r1, &r2)) | |
1370 | { | |
1371 | if (fi) | |
1372 | s390_get_signal_frame_info (fi); | |
1373 | break; | |
8ac0e65a JB |
1374 | } |
1375 | ||
4bc8c588 JB |
1376 | /* AHI r1, i2 --- add halfword immediate */ |
1377 | else if (is_ri (insn, op1_ahi, op2_ahi, &r1, &i2)) | |
1378 | pv_add_constant (&gpr[r1], i2); | |
1379 | ||
1380 | ||
1381 | /* AGHI r1, i2 --- add halfword immediate (64-bit version) */ | |
1382 | else if (GDB_TARGET_IS_ESAME | |
1383 | && is_ri (insn, op1_aghi, op2_aghi, &r1, &i2)) | |
1384 | pv_add_constant (&gpr[r1], i2); | |
1385 | ||
1386 | /* AR r1, r2 -- add register */ | |
1387 | else if (is_rr (insn, op_ar, &r1, &r2)) | |
1388 | pv_add (&gpr[r1], &gpr[r1], &gpr[r2]); | |
1389 | ||
1390 | /* BASR r1, 0 --- branch and save | |
1391 | Since r2 is zero, this saves the PC in r1, but doesn't branch. */ | |
1392 | else if (is_rr (insn, op_basr, &r1, &r2) | |
1393 | && r2 == 0) | |
1394 | pv_set_to_constant (&gpr[r1], next_pc); | |
1395 | ||
1396 | /* BRAS r1, i2 --- branch relative and save */ | |
1397 | else if (is_ri (insn, op1_bras, op2_bras, &r1, &i2)) | |
1398 | { | |
1399 | pv_set_to_constant (&gpr[r1], next_pc); | |
1400 | next_pc = pc + i2 * 2; | |
1401 | ||
1402 | /* We'd better not interpret any backward branches. We'll | |
1403 | never terminate. */ | |
1404 | if (next_pc <= pc) | |
1405 | break; | |
1406 | } | |
1407 | ||
1408 | /* L r1, d2(x2, b2) --- load */ | |
1409 | else if (is_rx (insn, op_l, &r1, &d2, &x2, &b2)) | |
1410 | { | |
1411 | struct prologue_value addr; | |
1412 | struct prologue_value *stack; | |
1413 | ||
1414 | compute_x_addr (&addr, gpr, d2, x2, b2); | |
1415 | ||
1416 | /* If it's a load from an in-line constant pool, then we can | |
1417 | simulate that, under the assumption that the code isn't | |
1418 | going to change between the time the processor actually | |
1419 | executed it creating the current frame, and the time when | |
1420 | we're analyzing the code to unwind past that frame. */ | |
1421 | if (addr.kind == pv_constant | |
1422 | && start_pc <= addr.k | |
1423 | && addr.k < next_pc) | |
1424 | pv_set_to_constant (&gpr[r1], | |
1425 | read_memory_integer (addr.k, 4)); | |
1426 | ||
1427 | /* If it's definitely a reference to something on the stack, | |
1428 | we can do that. */ | |
1429 | else if (s390_on_stack (&addr, 4, gpr, spill, &back_chain, &stack) | |
1430 | == pv_definite_yes) | |
1431 | gpr[r1] = *stack; | |
1432 | ||
1433 | /* Otherwise, we don't know the value. */ | |
1434 | else | |
1435 | pv_set_to_unknown (&gpr[r1]); | |
1436 | } | |
1437 | ||
1438 | /* LA r1, d2(x2, b2) --- load address */ | |
1439 | else if (is_rx (insn, op_la, &r1, &d2, &x2, &b2)) | |
1440 | compute_x_addr (&gpr[r1], gpr, d2, x2, b2); | |
1441 | ||
1442 | /* LARL r1, i2 --- load address relative long */ | |
1443 | else if (GDB_TARGET_IS_ESAME | |
1444 | && is_ril (insn, op1_larl, op2_larl, &r1, &i2)) | |
1445 | pv_set_to_constant (&gpr[r1], pc + i2 * 2); | |
1446 | ||
1447 | /* LGR r1, r2 --- load from register */ | |
1448 | else if (GDB_TARGET_IS_ESAME | |
1449 | && is_rre (insn, op_lgr, &r1, &r2)) | |
1450 | gpr[r1] = gpr[r2]; | |
1451 | ||
1452 | /* LHI r1, i2 --- load halfword immediate */ | |
1453 | else if (is_ri (insn, op1_lhi, op2_lhi, &r1, &i2)) | |
1454 | pv_set_to_constant (&gpr[r1], i2); | |
1455 | ||
1456 | /* LGHI r1, i2 --- load halfword immediate --- 64-bit version */ | |
1457 | else if (is_ri (insn, op1_lghi, op2_lghi, &r1, &i2)) | |
1458 | pv_set_to_constant (&gpr[r1], i2); | |
1459 | ||
1460 | /* LR r1, r2 --- load from register */ | |
1461 | else if (is_rr (insn, op_lr, &r1, &r2)) | |
1462 | gpr[r1] = gpr[r2]; | |
1463 | ||
1464 | /* NGR r1, r2 --- logical and --- 64-bit version */ | |
1465 | else if (GDB_TARGET_IS_ESAME | |
1466 | && is_rre (insn, op_ngr, &r1, &r2)) | |
1467 | pv_logical_and (&gpr[r1], &gpr[r1], &gpr[r2]); | |
1468 | ||
1469 | /* NR r1, r2 --- logical and */ | |
1470 | else if (is_rr (insn, op_nr, &r1, &r2)) | |
1471 | pv_logical_and (&gpr[r1], &gpr[r1], &gpr[r2]); | |
1472 | ||
1473 | /* NGR r1, r2 --- logical and --- 64-bit version */ | |
1474 | else if (GDB_TARGET_IS_ESAME | |
1475 | && is_rre (insn, op_ngr, &r1, &r2)) | |
1476 | pv_logical_and (&gpr[r1], &gpr[r1], &gpr[r2]); | |
1477 | ||
1478 | /* NR r1, r2 --- logical and */ | |
1479 | else if (is_rr (insn, op_nr, &r1, &r2)) | |
1480 | pv_logical_and (&gpr[r1], &gpr[r1], &gpr[r2]); | |
1481 | ||
1482 | /* S r1, d2(x2, b2) --- subtract from memory */ | |
1483 | else if (is_rx (insn, op_s, &r1, &d2, &x2, &b2)) | |
1484 | { | |
1485 | struct prologue_value addr; | |
1486 | struct prologue_value value; | |
1487 | struct prologue_value *stack; | |
1488 | ||
1489 | compute_x_addr (&addr, gpr, d2, x2, b2); | |
1490 | ||
1491 | /* If it's a load from an in-line constant pool, then we can | |
1492 | simulate that, under the assumption that the code isn't | |
1493 | going to change between the time the processor actually | |
1494 | executed it and the time when we're analyzing it. */ | |
1495 | if (addr.kind == pv_constant | |
1496 | && start_pc <= addr.k | |
1497 | && addr.k < pc) | |
1498 | pv_set_to_constant (&value, read_memory_integer (addr.k, 4)); | |
1499 | ||
1500 | /* If it's definitely a reference to something on the stack, | |
1501 | we could do that. */ | |
1502 | else if (s390_on_stack (&addr, 4, gpr, spill, &back_chain, &stack) | |
1503 | == pv_definite_yes) | |
1504 | value = *stack; | |
1505 | ||
1506 | /* Otherwise, we don't know the value. */ | |
1507 | else | |
1508 | pv_set_to_unknown (&value); | |
1509 | ||
1510 | pv_subtract (&gpr[r1], &gpr[r1], &value); | |
1511 | } | |
1512 | ||
1513 | /* ST r1, d2(x2, b2) --- store */ | |
1514 | else if (is_rx (insn, op_st, &r1, &d2, &x2, &b2)) | |
1515 | { | |
1516 | struct prologue_value addr; | |
1517 | ||
1518 | compute_x_addr (&addr, gpr, d2, x2, b2); | |
1519 | ||
1520 | /* The below really should be '4', not 'S390_GPR_SIZE'; this | |
1521 | instruction always stores 32 bits, regardless of the full | |
1522 | size of the GPR. */ | |
1523 | if (s390_store (&addr, 4, &gpr[r1], gpr, spill, &back_chain) | |
1524 | == pv_maybe) | |
1525 | /* If we can't be sure that it's *not* a store to | |
1526 | something we're tracing, then we would have to mark all | |
1527 | our memory as unknown --- after all, it *could* be a | |
1528 | store to any of them --- so we might as well just stop | |
1529 | interpreting. */ | |
1530 | break; | |
1531 | } | |
1532 | ||
1533 | /* STD r1, d2(x2,b2) --- store floating-point register */ | |
1534 | else if (is_rx (insn, op_std, &r1, &d2, &x2, &b2)) | |
1535 | { | |
1536 | struct prologue_value addr; | |
1537 | ||
1538 | compute_x_addr (&addr, gpr, d2, x2, b2); | |
1539 | ||
1540 | if (s390_store (&addr, 8, &fpr[r1], gpr, spill, &back_chain) | |
1541 | == pv_maybe) | |
1542 | /* If we can't be sure that it's *not* a store to | |
1543 | something we're tracing, then we would have to mark all | |
1544 | our memory as unknown --- after all, it *could* be a | |
1545 | store to any of them --- so we might as well just stop | |
1546 | interpreting. */ | |
1547 | break; | |
1548 | } | |
1549 | ||
1550 | /* STG r1, d2(x2, b2) --- 64-bit store */ | |
1551 | else if (GDB_TARGET_IS_ESAME | |
1552 | && is_rxe (insn, op1_stg, op2_stg, &r1, &d2, &x2, &b2)) | |
1553 | { | |
1554 | struct prologue_value addr; | |
1555 | ||
1556 | compute_x_addr (&addr, gpr, d2, x2, b2); | |
1557 | ||
1558 | /* The below really should be '8', not 'S390_GPR_SIZE'; this | |
1559 | instruction always stores 64 bits, regardless of the full | |
1560 | size of the GPR. */ | |
1561 | if (s390_store (&addr, 8, &gpr[r1], gpr, spill, &back_chain) | |
1562 | == pv_maybe) | |
1563 | /* If we can't be sure that it's *not* a store to | |
1564 | something we're tracing, then we would have to mark all | |
1565 | our memory as unknown --- after all, it *could* be a | |
1566 | store to any of them --- so we might as well just stop | |
1567 | interpreting. */ | |
1568 | break; | |
1569 | } | |
1570 | ||
1571 | /* STM r1, r3, d2(b2) --- store multiple */ | |
1572 | else if (is_rs (insn, op_stm, &r1, &r3, &d2, &b2)) | |
1573 | { | |
1574 | int regnum; | |
1575 | int offset; | |
1576 | struct prologue_value addr; | |
1577 | ||
1578 | for (regnum = r1, offset = 0; | |
1579 | regnum <= r3; | |
1580 | regnum++, offset += 4) | |
1581 | { | |
1582 | compute_x_addr (&addr, gpr, d2 + offset, 0, b2); | |
1583 | ||
1584 | if (s390_store (&addr, 4, &gpr[regnum], gpr, spill, &back_chain) | |
1585 | == pv_maybe) | |
1586 | /* If we can't be sure that it's *not* a store to | |
1587 | something we're tracing, then we would have to mark all | |
1588 | our memory as unknown --- after all, it *could* be a | |
1589 | store to any of them --- so we might as well just stop | |
1590 | interpreting. */ | |
1591 | break; | |
1592 | } | |
1593 | ||
1594 | /* If we left the loop early, we should stop interpreting | |
1595 | altogether. */ | |
1596 | if (regnum <= r3) | |
1597 | break; | |
1598 | } | |
1599 | ||
1600 | /* STMG r1, r3, d2(b2) --- store multiple, 64-bit */ | |
1601 | else if (GDB_TARGET_IS_ESAME | |
1602 | && is_rse (insn, op1_stmg, op2_stmg, &r1, &r3, &d2, &b2)) | |
1603 | { | |
1604 | int regnum; | |
1605 | int offset; | |
1606 | struct prologue_value addr; | |
1607 | ||
1608 | for (regnum = r1, offset = 0; | |
1609 | regnum <= r3; | |
1610 | regnum++, offset += 8) | |
1611 | { | |
1612 | compute_x_addr (&addr, gpr, d2 + offset, 0, b2); | |
1613 | ||
1614 | if (s390_store (&addr, 8, &gpr[regnum], gpr, spill, &back_chain) | |
1615 | == pv_maybe) | |
1616 | /* If we can't be sure that it's *not* a store to | |
1617 | something we're tracing, then we would have to mark all | |
1618 | our memory as unknown --- after all, it *could* be a | |
1619 | store to any of them --- so we might as well just stop | |
1620 | interpreting. */ | |
1621 | break; | |
1622 | } | |
1623 | ||
1624 | /* If we left the loop early, we should stop interpreting | |
1625 | altogether. */ | |
1626 | if (regnum <= r3) | |
1627 | break; | |
1628 | } | |
1629 | ||
1630 | else | |
1631 | /* An instruction we don't know how to simulate. The only | |
1632 | safe thing to do would be to set every value we're tracking | |
1633 | to 'unknown'. Instead, we'll be optimistic: we just stop | |
1634 | interpreting, and assume that the machine state we've got | |
1635 | now is good enough for unwinding the stack. */ | |
1636 | break; | |
1637 | ||
1638 | /* Record the address after the last instruction that changed | |
1639 | the FP, SP, or backlink. Ignore instructions that changed | |
1640 | them back to their original values --- those are probably | |
1641 | restore instructions. (The back chain is never restored, | |
1642 | just popped.) */ | |
1643 | { | |
d0f54f9d JB |
1644 | struct prologue_value *sp = &gpr[S390_SP_REGNUM - S390_R0_REGNUM]; |
1645 | struct prologue_value *fp = &gpr[S390_FRAME_REGNUM - S390_R0_REGNUM]; | |
4bc8c588 JB |
1646 | |
1647 | if ((! pv_is_identical (&pre_insn_sp, sp) | |
1648 | && ! pv_is_register (sp, S390_SP_REGNUM, 0)) | |
1649 | || (! pv_is_identical (&pre_insn_fp, fp) | |
1650 | && ! pv_is_register (fp, S390_FRAME_REGNUM, 0)) | |
1651 | || ! pv_is_identical (&pre_insn_back_chain, &back_chain)) | |
1652 | after_last_frame_setup_insn = next_pc; | |
1653 | } | |
5769d3cd | 1654 | } |
4bc8c588 JB |
1655 | |
1656 | /* Okay, now gpr[], fpr[], spill[], and back_chain reflect the state | |
1657 | of the machine as of the first instruction we couldn't interpret | |
1658 | (hopefully the first non-prologue instruction). */ | |
1659 | { | |
1660 | /* The size of the frame, or (CORE_ADDR) -1 if we couldn't figure | |
1661 | that out. */ | |
1662 | CORE_ADDR frame_size = -1; | |
1663 | ||
1664 | /* The value the SP had upon entry to the function, or | |
1665 | (CORE_ADDR) -1 if we can't figure that out. */ | |
1666 | CORE_ADDR original_sp = -1; | |
1667 | ||
1668 | /* Are we using S390_FRAME_REGNUM as a frame pointer register? */ | |
1669 | int using_frame_pointer = 0; | |
1670 | ||
1671 | /* If S390_FRAME_REGNUM is some constant offset from the SP, then | |
1672 | that strongly suggests that we're going to use that as our | |
1673 | frame pointer register, not the SP. */ | |
5769d3cd | 1674 | { |
d0f54f9d | 1675 | struct prologue_value *fp = &gpr[S390_FRAME_REGNUM - S390_R0_REGNUM]; |
4bc8c588 JB |
1676 | |
1677 | if (fp->kind == pv_register | |
1678 | && fp->reg == S390_SP_REGNUM) | |
1679 | using_frame_pointer = 1; | |
5769d3cd | 1680 | } |
4bc8c588 JB |
1681 | |
1682 | /* If we were given a frame_info structure, we may be able to use | |
1683 | the frame's base address to figure out the actual value of the | |
1684 | original SP. */ | |
1685 | if (fi && get_frame_base (fi)) | |
1686 | { | |
1687 | int frame_base_regno; | |
1688 | struct prologue_value *frame_base; | |
1689 | ||
1690 | /* The meaning of the frame base depends on whether the | |
1691 | function uses a frame pointer register other than the SP or | |
1692 | not (see s390_read_fp): | |
1693 | - If the function does use a frame pointer register other | |
1694 | than the SP, then the frame base is that register's | |
1695 | value. | |
1696 | - If the function doesn't use a frame pointer, then the | |
1697 | frame base is the SP itself. | |
1698 | We're duplicating some of the logic of s390_fp_regnum here, | |
1699 | but we don't want to call that, because it would just do | |
1700 | exactly the same analysis we've already done above. */ | |
1701 | if (using_frame_pointer) | |
1702 | frame_base_regno = S390_FRAME_REGNUM; | |
1703 | else | |
1704 | frame_base_regno = S390_SP_REGNUM; | |
1705 | ||
d0f54f9d | 1706 | frame_base = &gpr[frame_base_regno - S390_R0_REGNUM]; |
4bc8c588 JB |
1707 | |
1708 | /* We know the frame base address; if the value of whatever | |
1709 | register it came from is a constant offset from the | |
1710 | original SP, then we can reconstruct the original SP just | |
1711 | by subtracting off that constant. */ | |
1712 | if (frame_base->kind == pv_register | |
1713 | && frame_base->reg == S390_SP_REGNUM) | |
1714 | original_sp = get_frame_base (fi) - frame_base->k; | |
1715 | } | |
1716 | ||
1717 | /* If the analysis said that the current SP value is the original | |
1718 | value less some constant, then that constant is the frame size. */ | |
1719 | { | |
d0f54f9d | 1720 | struct prologue_value *sp = &gpr[S390_SP_REGNUM - S390_R0_REGNUM]; |
4bc8c588 JB |
1721 | |
1722 | if (sp->kind == pv_register | |
1723 | && sp->reg == S390_SP_REGNUM) | |
1724 | frame_size = -sp->k; | |
1725 | } | |
1726 | ||
1727 | /* If we knew other registers' current values, we could check if | |
1728 | the analysis said any of those were related to the original SP | |
1729 | value, too. But for now, we'll just punt. */ | |
1730 | ||
1731 | /* If the caller passed in an 'extra info' structure, fill in the | |
1732 | parts we can. */ | |
1733 | if (fextra_info) | |
1734 | { | |
1735 | if (init_extra_info || ! fextra_info->initialised) | |
1736 | { | |
1737 | s390_memset_extra_info (fextra_info); | |
1738 | fextra_info->function_start = start_pc; | |
1739 | fextra_info->initialised = 1; | |
1740 | } | |
1741 | ||
1742 | if (frame_size != -1) | |
1743 | { | |
a9dd42f1 | 1744 | fextra_info->stack_bought_valid = 1; |
4bc8c588 JB |
1745 | fextra_info->stack_bought = frame_size; |
1746 | } | |
1747 | ||
1748 | /* Assume everything was okay, and indicate otherwise when we | |
1749 | find something amiss. */ | |
1750 | fextra_info->good_prologue = 1; | |
1751 | ||
1752 | if (using_frame_pointer) | |
1753 | /* Actually, nobody cares about the exact PC, so any | |
1754 | non-zero value will do here. */ | |
1755 | fextra_info->frame_pointer_saved_pc = 1; | |
1756 | ||
1757 | /* If we weren't able to find the size of the frame, or find | |
1758 | the original sp based on actual current register values, | |
1759 | then we're not going to be able to unwind this frame. | |
1760 | ||
1761 | (If we're just doing prologue analysis to set a breakpoint, | |
1762 | then frame_size might be known, but original_sp unknown; if | |
1763 | we're analyzing a real frame which uses alloca, then | |
1764 | original_sp might be known (from the frame pointer | |
1765 | register), but the frame size might be unknown.) */ | |
1766 | if (original_sp == -1 && frame_size == -1) | |
1767 | fextra_info->good_prologue = 0; | |
1768 | ||
1769 | if (fextra_info->good_prologue) | |
1770 | fextra_info->skip_prologue_function_start | |
1771 | = after_last_frame_setup_insn; | |
1772 | else | |
1773 | /* If the prologue was too complex for us to make sense of, | |
1774 | then perhaps it's better to just not skip anything at | |
1775 | all. */ | |
1776 | fextra_info->skip_prologue_function_start = start_pc; | |
1777 | } | |
1778 | ||
1779 | /* Indicate where registers were saved on the stack, if: | |
1780 | - the caller seems to want to know, | |
1781 | - the caller provided an actual SP, and | |
1782 | - the analysis gave us enough information to actually figure it | |
1783 | out. */ | |
1784 | if (fi | |
1b1d3794 | 1785 | && deprecated_get_frame_saved_regs (fi) |
4bc8c588 JB |
1786 | && original_sp != -1) |
1787 | { | |
1788 | int slot_num; | |
1789 | CORE_ADDR slot_addr; | |
1b1d3794 | 1790 | CORE_ADDR *saved_regs = deprecated_get_frame_saved_regs (fi); |
4bc8c588 JB |
1791 | |
1792 | /* Scan the spill array; if a spill slot says it holds the | |
1793 | original value of some register, then record that slot's | |
1794 | address as the place that register was saved. | |
1795 | ||
1796 | Just for kicks, note that, even if registers aren't saved | |
1797 | in their officially-sanctioned slots, this will still work | |
1798 | --- we know what really got put where. */ | |
1799 | ||
1800 | /* First, the slots for r2 -- r15. */ | |
1801 | for (slot_num = 0, slot_addr = original_sp + 2 * S390_GPR_SIZE; | |
1802 | slot_num < 14; | |
1803 | slot_num++, slot_addr += S390_GPR_SIZE) | |
1804 | { | |
1805 | struct prologue_value *slot = &spill[slot_num]; | |
1806 | ||
1807 | if (slot->kind == pv_register | |
1808 | && slot->k == 0) | |
1809 | saved_regs[slot->reg] = slot_addr; | |
1810 | } | |
1811 | ||
1812 | /* Then, the slots for f0, f2, f4, and f6. They're a | |
1813 | different size. */ | |
1814 | for (slot_num = 14, slot_addr = original_sp + 16 * S390_GPR_SIZE; | |
1815 | slot_num < S390_NUM_SPILL_SLOTS; | |
1816 | slot_num++, slot_addr += S390_FPR_SIZE) | |
1817 | { | |
1818 | struct prologue_value *slot = &spill[slot_num]; | |
1819 | ||
1820 | if (slot->kind == pv_register | |
1821 | && slot->k == 0) | |
1822 | saved_regs[slot->reg] = slot_addr; | |
1823 | } | |
1824 | ||
1825 | /* The stack pointer's element of saved_regs[] is special. */ | |
1826 | saved_regs[S390_SP_REGNUM] = original_sp; | |
1827 | } | |
1828 | } | |
1829 | ||
1830 | return result; | |
5769d3cd AC |
1831 | } |
1832 | ||
d0f54f9d JB |
1833 | /* Return true if we are in the functin's epilogue, i.e. after the |
1834 | instruction that destroyed the function's stack frame. */ | |
1835 | static int | |
1836 | s390_in_function_epilogue_p (struct gdbarch *gdbarch, CORE_ADDR pc) | |
1837 | { | |
1838 | int word_size = gdbarch_ptr_bit (gdbarch) / 8; | |
1839 | ||
1840 | /* In frameless functions, there's not frame to destroy and thus | |
1841 | we don't care about the epilogue. | |
1842 | ||
1843 | In functions with frame, the epilogue sequence is a pair of | |
1844 | a LM-type instruction that restores (amongst others) the | |
1845 | return register %r14 and the stack pointer %r15, followed | |
1846 | by a branch 'br %r14' --or equivalent-- that effects the | |
1847 | actual return. | |
1848 | ||
1849 | In that situation, this function needs to return 'true' in | |
1850 | exactly one case: when pc points to that branch instruction. | |
1851 | ||
1852 | Thus we try to disassemble the one instructions immediately | |
1853 | preceeding pc and check whether it is an LM-type instruction | |
1854 | modifying the stack pointer. | |
1855 | ||
1856 | Note that disassembling backwards is not reliable, so there | |
1857 | is a slight chance of false positives here ... */ | |
1858 | ||
1859 | bfd_byte insn[6]; | |
1860 | unsigned int r1, r3, b2; | |
1861 | int d2; | |
1862 | ||
1863 | if (word_size == 4 | |
1864 | && !read_memory_nobpt (pc - 4, insn, 4) | |
1865 | && is_rs (insn, op_lm, &r1, &r3, &d2, &b2) | |
1866 | && r3 == S390_SP_REGNUM - S390_R0_REGNUM) | |
1867 | return 1; | |
1868 | ||
1869 | if (word_size == 8 | |
1870 | && !read_memory_nobpt (pc - 6, insn, 6) | |
1871 | && is_rse (insn, op1_lmg, op2_lmg, &r1, &r3, &d2, &b2) | |
1872 | && r3 == S390_SP_REGNUM - S390_R0_REGNUM) | |
1873 | return 1; | |
1874 | ||
1875 | return 0; | |
1876 | } | |
5769d3cd | 1877 | |
a78f21af | 1878 | static int |
5769d3cd AC |
1879 | s390_check_function_end (CORE_ADDR pc) |
1880 | { | |
1881 | bfd_byte instr[S390_MAX_INSTR_SIZE]; | |
5769d3cd AC |
1882 | int regidx, instrlen; |
1883 | ||
a788de9b | 1884 | instrlen = s390_readinstruction (instr, pc); |
5769d3cd AC |
1885 | if (instrlen < 0) |
1886 | return -1; | |
1887 | /* check for BR */ | |
1888 | if (instrlen != 2 || instr[0] != 07 || (instr[1] >> 4) != 0xf) | |
1889 | return 0; | |
1890 | regidx = instr[1] & 0xf; | |
1891 | /* Check for LMG or LG */ | |
1892 | instrlen = | |
a788de9b | 1893 | s390_readinstruction (instr, pc - (GDB_TARGET_IS_ESAME ? 6 : 4)); |
5769d3cd AC |
1894 | if (instrlen < 0) |
1895 | return -1; | |
1896 | if (GDB_TARGET_IS_ESAME) | |
1897 | { | |
1898 | ||
1899 | if (instrlen != 6 || instr[0] != 0xeb || instr[5] != 0x4) | |
1900 | return 0; | |
1901 | } | |
1902 | else if (instrlen != 4 || instr[0] != 0x98) | |
1903 | { | |
1904 | return 0; | |
1905 | } | |
1906 | if ((instr[2] >> 4) != 0xf) | |
1907 | return 0; | |
1908 | if (regidx == 14) | |
1909 | return 1; | |
a788de9b | 1910 | instrlen = s390_readinstruction (instr, pc - (GDB_TARGET_IS_ESAME ? 12 : 8)); |
5769d3cd AC |
1911 | if (instrlen < 0) |
1912 | return -1; | |
1913 | if (GDB_TARGET_IS_ESAME) | |
1914 | { | |
1915 | /* Check for LG */ | |
1916 | if (instrlen != 6 || instr[0] != 0xe3 || instr[5] != 0x4) | |
1917 | return 0; | |
1918 | } | |
1919 | else | |
1920 | { | |
1921 | /* Check for L */ | |
1922 | if (instrlen != 4 || instr[0] != 0x58) | |
1923 | return 0; | |
1924 | } | |
1925 | if (instr[2] >> 4 != 0xf) | |
1926 | return 0; | |
1927 | if (instr[1] >> 4 != regidx) | |
1928 | return 0; | |
1929 | return 1; | |
1930 | } | |
1931 | ||
1932 | static CORE_ADDR | |
1933 | s390_sniff_pc_function_start (CORE_ADDR pc, struct frame_info *fi) | |
1934 | { | |
1935 | CORE_ADDR function_start, test_function_start; | |
1936 | int loop_cnt, err, function_end; | |
1937 | struct frame_extra_info fextra_info; | |
1938 | function_start = get_pc_function_start (pc); | |
1939 | ||
1940 | if (function_start == 0) | |
1941 | { | |
1942 | test_function_start = pc; | |
1943 | if (test_function_start & 1) | |
1944 | return 0; /* This has to be bogus */ | |
1945 | loop_cnt = 0; | |
1946 | do | |
1947 | { | |
1948 | ||
1949 | err = | |
1950 | s390_get_frame_info (test_function_start, &fextra_info, fi, 1); | |
1951 | loop_cnt++; | |
1952 | test_function_start -= 2; | |
1953 | function_end = s390_check_function_end (test_function_start); | |
1954 | } | |
1955 | while (!(function_end == 1 || err || loop_cnt >= 4096 || | |
1956 | (fextra_info.good_prologue))); | |
1957 | if (fextra_info.good_prologue) | |
1958 | function_start = fextra_info.function_start; | |
1959 | else if (function_end == 1) | |
1960 | function_start = test_function_start; | |
1961 | } | |
1962 | return function_start; | |
1963 | } | |
1964 | ||
1965 | ||
a78f21af | 1966 | static int |
5769d3cd AC |
1967 | s390_frameless_function_invocation (struct frame_info *fi) |
1968 | { | |
1969 | struct frame_extra_info fextra_info, *fextra_info_ptr; | |
1970 | int frameless = 0; | |
1971 | ||
11c02a10 | 1972 | if (get_next_frame (fi) == NULL) /* no may be frameless */ |
5769d3cd | 1973 | { |
da50a4b7 AC |
1974 | if (get_frame_extra_info (fi)) |
1975 | fextra_info_ptr = get_frame_extra_info (fi); | |
5769d3cd AC |
1976 | else |
1977 | { | |
1978 | fextra_info_ptr = &fextra_info; | |
50abf9e5 | 1979 | s390_get_frame_info (s390_sniff_pc_function_start (get_frame_pc (fi), fi), |
5769d3cd AC |
1980 | fextra_info_ptr, fi, 1); |
1981 | } | |
a9dd42f1 JB |
1982 | frameless = (fextra_info_ptr->stack_bought_valid |
1983 | && fextra_info_ptr->stack_bought == 0); | |
5769d3cd AC |
1984 | } |
1985 | return frameless; | |
1986 | ||
1987 | } | |
1988 | ||
1989 | ||
1990 | static int | |
1991 | s390_is_sigreturn (CORE_ADDR pc, struct frame_info *sighandler_fi, | |
1992 | CORE_ADDR *sregs, CORE_ADDR *sigcaller_pc) | |
1993 | { | |
1994 | bfd_byte instr[S390_MAX_INSTR_SIZE]; | |
5769d3cd AC |
1995 | int instrlen; |
1996 | CORE_ADDR scontext; | |
1997 | int retval = 0; | |
1998 | CORE_ADDR orig_sp; | |
1999 | CORE_ADDR temp_sregs; | |
2000 | ||
2001 | scontext = temp_sregs = 0; | |
2002 | ||
a788de9b | 2003 | instrlen = s390_readinstruction (instr, pc); |
5769d3cd AC |
2004 | if (sigcaller_pc) |
2005 | *sigcaller_pc = 0; | |
2006 | if (((instrlen == S390_SYSCALL_SIZE) && | |
2007 | (instr[0] == S390_SYSCALL_OPCODE)) && | |
2008 | ((instr[1] == s390_NR_sigreturn) || (instr[1] == s390_NR_rt_sigreturn))) | |
2009 | { | |
2010 | if (sighandler_fi) | |
2011 | { | |
2012 | if (s390_frameless_function_invocation (sighandler_fi)) | |
1e2330ba | 2013 | orig_sp = get_frame_base (sighandler_fi); |
5769d3cd AC |
2014 | else |
2015 | orig_sp = ADDR_BITS_REMOVE ((CORE_ADDR) | |
1e2330ba | 2016 | read_memory_integer (get_frame_base (sighandler_fi), |
5769d3cd AC |
2017 | S390_GPR_SIZE)); |
2018 | if (orig_sp && sigcaller_pc) | |
2019 | { | |
2020 | scontext = orig_sp + S390_SIGNAL_FRAMESIZE; | |
2021 | if (pc == scontext && instr[1] == s390_NR_rt_sigreturn) | |
2022 | { | |
2023 | /* We got a new style rt_signal */ | |
2024 | /* get address of read ucontext->uc_mcontext */ | |
2025 | temp_sregs = orig_sp + (GDB_TARGET_IS_ESAME ? | |
2026 | S390X_UC_MCONTEXT_OFFSET : | |
2027 | S390_UC_MCONTEXT_OFFSET); | |
2028 | } | |
2029 | else | |
2030 | { | |
2031 | /* read sigcontext->sregs */ | |
2032 | temp_sregs = ADDR_BITS_REMOVE ((CORE_ADDR) | |
2033 | read_memory_integer (scontext | |
2034 | + | |
2035 | (GDB_TARGET_IS_ESAME | |
2036 | ? | |
2037 | S390X_SIGCONTEXT_SREGS_OFFSET | |
2038 | : | |
2039 | S390_SIGCONTEXT_SREGS_OFFSET), | |
2040 | S390_GPR_SIZE)); | |
2041 | ||
2042 | } | |
2043 | /* read sigregs->psw.addr */ | |
2044 | *sigcaller_pc = | |
2045 | ADDR_BITS_REMOVE ((CORE_ADDR) | |
2046 | read_memory_integer (temp_sregs + | |
d0f54f9d JB |
2047 | DEPRECATED_REGISTER_BYTE (S390_PSWA_REGNUM), |
2048 | S390_GPR_SIZE)); | |
5769d3cd AC |
2049 | } |
2050 | } | |
2051 | retval = 1; | |
2052 | } | |
2053 | if (sregs) | |
2054 | *sregs = temp_sregs; | |
2055 | return retval; | |
2056 | } | |
2057 | ||
2058 | /* | |
2059 | We need to do something better here but this will keep us out of trouble | |
2060 | for the moment. | |
2061 | For some reason the blockframe.c calls us with fi->next->fromleaf | |
2062 | so this seems of little use to us. */ | |
a78f21af | 2063 | static CORE_ADDR |
5769d3cd AC |
2064 | s390_init_frame_pc_first (int next_fromleaf, struct frame_info *fi) |
2065 | { | |
2066 | CORE_ADDR sigcaller_pc; | |
97f46953 | 2067 | CORE_ADDR pc = 0; |
5769d3cd AC |
2068 | if (next_fromleaf) |
2069 | { | |
97f46953 | 2070 | pc = ADDR_BITS_REMOVE (read_register (S390_RETADDR_REGNUM)); |
5769d3cd AC |
2071 | /* fix signal handlers */ |
2072 | } | |
97f46953 AC |
2073 | else if (get_next_frame (fi) && get_frame_pc (get_next_frame (fi))) |
2074 | pc = s390_frame_saved_pc_nofix (get_next_frame (fi)); | |
2075 | if (pc && get_next_frame (fi) && get_frame_base (get_next_frame (fi)) | |
2076 | && s390_is_sigreturn (pc, get_next_frame (fi), NULL, &sigcaller_pc)) | |
5769d3cd | 2077 | { |
97f46953 | 2078 | pc = sigcaller_pc; |
5769d3cd | 2079 | } |
97f46953 | 2080 | return pc; |
5769d3cd AC |
2081 | } |
2082 | ||
a78f21af | 2083 | static void |
5769d3cd AC |
2084 | s390_init_extra_frame_info (int fromleaf, struct frame_info *fi) |
2085 | { | |
a00a19e9 | 2086 | frame_extra_info_zalloc (fi, sizeof (struct frame_extra_info)); |
50abf9e5 AC |
2087 | if (get_frame_pc (fi)) |
2088 | s390_get_frame_info (s390_sniff_pc_function_start (get_frame_pc (fi), fi), | |
da50a4b7 | 2089 | get_frame_extra_info (fi), fi, 1); |
5769d3cd | 2090 | else |
da50a4b7 | 2091 | s390_memset_extra_info (get_frame_extra_info (fi)); |
5769d3cd AC |
2092 | } |
2093 | ||
2094 | /* If saved registers of frame FI are not known yet, read and cache them. | |
2095 | &FEXTRA_INFOP contains struct frame_extra_info; TDATAP can be NULL, | |
2096 | in which case the framedata are read. */ | |
2097 | ||
a78f21af | 2098 | static void |
5769d3cd AC |
2099 | s390_frame_init_saved_regs (struct frame_info *fi) |
2100 | { | |
2101 | ||
2102 | int quick; | |
2103 | ||
1b1d3794 | 2104 | if (deprecated_get_frame_saved_regs (fi) == NULL) |
5769d3cd AC |
2105 | { |
2106 | /* zalloc memsets the saved regs */ | |
2107 | frame_saved_regs_zalloc (fi); | |
50abf9e5 | 2108 | if (get_frame_pc (fi)) |
5769d3cd | 2109 | { |
da50a4b7 AC |
2110 | quick = (get_frame_extra_info (fi) |
2111 | && get_frame_extra_info (fi)->initialised | |
2112 | && get_frame_extra_info (fi)->good_prologue); | |
2113 | s390_get_frame_info (quick | |
2114 | ? get_frame_extra_info (fi)->function_start | |
2115 | : s390_sniff_pc_function_start (get_frame_pc (fi), fi), | |
2116 | get_frame_extra_info (fi), fi, !quick); | |
5769d3cd AC |
2117 | } |
2118 | } | |
2119 | } | |
2120 | ||
2121 | ||
2122 | ||
5769d3cd AC |
2123 | static CORE_ADDR |
2124 | s390_frame_saved_pc_nofix (struct frame_info *fi) | |
2125 | { | |
da50a4b7 AC |
2126 | if (get_frame_extra_info (fi) && get_frame_extra_info (fi)->saved_pc_valid) |
2127 | return get_frame_extra_info (fi)->saved_pc; | |
5c3cf190 | 2128 | |
1e2330ba AC |
2129 | if (deprecated_generic_find_dummy_frame (get_frame_pc (fi), |
2130 | get_frame_base (fi))) | |
2131 | return deprecated_read_register_dummy (get_frame_pc (fi), | |
2132 | get_frame_base (fi), S390_PC_REGNUM); | |
5c3cf190 | 2133 | |
5769d3cd | 2134 | s390_frame_init_saved_regs (fi); |
da50a4b7 | 2135 | if (get_frame_extra_info (fi)) |
5769d3cd | 2136 | { |
da50a4b7 AC |
2137 | get_frame_extra_info (fi)->saved_pc_valid = 1; |
2138 | if (get_frame_extra_info (fi)->good_prologue | |
1b1d3794 | 2139 | && deprecated_get_frame_saved_regs (fi)[S390_RETADDR_REGNUM]) |
da50a4b7 | 2140 | get_frame_extra_info (fi)->saved_pc |
529765f4 | 2141 | = ADDR_BITS_REMOVE (read_memory_integer |
1b1d3794 | 2142 | (deprecated_get_frame_saved_regs (fi)[S390_RETADDR_REGNUM], |
529765f4 JB |
2143 | S390_GPR_SIZE)); |
2144 | else | |
da50a4b7 | 2145 | get_frame_extra_info (fi)->saved_pc |
529765f4 | 2146 | = ADDR_BITS_REMOVE (read_register (S390_RETADDR_REGNUM)); |
da50a4b7 | 2147 | return get_frame_extra_info (fi)->saved_pc; |
5769d3cd AC |
2148 | } |
2149 | return 0; | |
2150 | } | |
2151 | ||
a78f21af | 2152 | static CORE_ADDR |
5769d3cd AC |
2153 | s390_frame_saved_pc (struct frame_info *fi) |
2154 | { | |
2155 | CORE_ADDR saved_pc = 0, sig_pc; | |
2156 | ||
da50a4b7 AC |
2157 | if (get_frame_extra_info (fi) |
2158 | && get_frame_extra_info (fi)->sig_fixed_saved_pc_valid) | |
2159 | return get_frame_extra_info (fi)->sig_fixed_saved_pc; | |
5769d3cd AC |
2160 | saved_pc = s390_frame_saved_pc_nofix (fi); |
2161 | ||
da50a4b7 | 2162 | if (get_frame_extra_info (fi)) |
5769d3cd | 2163 | { |
da50a4b7 | 2164 | get_frame_extra_info (fi)->sig_fixed_saved_pc_valid = 1; |
5769d3cd AC |
2165 | if (saved_pc) |
2166 | { | |
2167 | if (s390_is_sigreturn (saved_pc, fi, NULL, &sig_pc)) | |
2168 | saved_pc = sig_pc; | |
2169 | } | |
da50a4b7 | 2170 | get_frame_extra_info (fi)->sig_fixed_saved_pc = saved_pc; |
5769d3cd AC |
2171 | } |
2172 | return saved_pc; | |
2173 | } | |
2174 | ||
2175 | ||
2176 | ||
2177 | ||
5a203e44 AC |
2178 | /* We want backtraces out of signal handlers so we don't set |
2179 | (get_frame_type (thisframe) == SIGTRAMP_FRAME) to 1 */ | |
5769d3cd | 2180 | |
a78f21af | 2181 | static CORE_ADDR |
5769d3cd AC |
2182 | s390_frame_chain (struct frame_info *thisframe) |
2183 | { | |
2184 | CORE_ADDR prev_fp = 0; | |
2185 | ||
1e2330ba AC |
2186 | if (deprecated_generic_find_dummy_frame (get_frame_pc (thisframe), |
2187 | get_frame_base (thisframe))) | |
2188 | return deprecated_read_register_dummy (get_frame_pc (thisframe), | |
2189 | get_frame_base (thisframe), | |
135c175f | 2190 | S390_SP_REGNUM); |
5769d3cd AC |
2191 | else |
2192 | { | |
2193 | int sigreturn = 0; | |
2194 | CORE_ADDR sregs = 0; | |
2195 | struct frame_extra_info prev_fextra_info; | |
2196 | ||
2197 | memset (&prev_fextra_info, 0, sizeof (prev_fextra_info)); | |
50abf9e5 | 2198 | if (get_frame_pc (thisframe)) |
5769d3cd AC |
2199 | { |
2200 | CORE_ADDR saved_pc, sig_pc; | |
2201 | ||
2202 | saved_pc = s390_frame_saved_pc_nofix (thisframe); | |
2203 | if (saved_pc) | |
2204 | { | |
2205 | if ((sigreturn = | |
2206 | s390_is_sigreturn (saved_pc, thisframe, &sregs, &sig_pc))) | |
2207 | saved_pc = sig_pc; | |
2208 | s390_get_frame_info (s390_sniff_pc_function_start | |
2209 | (saved_pc, NULL), &prev_fextra_info, NULL, | |
2210 | 1); | |
2211 | } | |
2212 | } | |
2213 | if (sigreturn) | |
2214 | { | |
2215 | /* read sigregs,regs.gprs[11 or 15] */ | |
2216 | prev_fp = read_memory_integer (sregs + | |
d0f54f9d | 2217 | DEPRECATED_REGISTER_BYTE (S390_R0_REGNUM + |
5769d3cd AC |
2218 | (prev_fextra_info. |
2219 | frame_pointer_saved_pc | |
2220 | ? 11 : 15)), | |
2221 | S390_GPR_SIZE); | |
da50a4b7 | 2222 | get_frame_extra_info (thisframe)->sigcontext = sregs; |
5769d3cd AC |
2223 | } |
2224 | else | |
2225 | { | |
1b1d3794 | 2226 | if (deprecated_get_frame_saved_regs (thisframe)) |
5769d3cd | 2227 | { |
5769d3cd AC |
2228 | int regno; |
2229 | ||
31c4d430 | 2230 | if (prev_fextra_info.frame_pointer_saved_pc |
1b1d3794 | 2231 | && deprecated_get_frame_saved_regs (thisframe)[S390_FRAME_REGNUM]) |
31c4d430 JB |
2232 | regno = S390_FRAME_REGNUM; |
2233 | else | |
2234 | regno = S390_SP_REGNUM; | |
2235 | ||
1b1d3794 | 2236 | if (deprecated_get_frame_saved_regs (thisframe)[regno]) |
31c4d430 JB |
2237 | { |
2238 | /* The SP's entry of `saved_regs' is special. */ | |
2239 | if (regno == S390_SP_REGNUM) | |
1b1d3794 | 2240 | prev_fp = deprecated_get_frame_saved_regs (thisframe)[regno]; |
31c4d430 JB |
2241 | else |
2242 | prev_fp = | |
1b1d3794 | 2243 | read_memory_integer (deprecated_get_frame_saved_regs (thisframe)[regno], |
31c4d430 JB |
2244 | S390_GPR_SIZE); |
2245 | } | |
5769d3cd AC |
2246 | } |
2247 | } | |
2248 | } | |
2249 | return ADDR_BITS_REMOVE (prev_fp); | |
2250 | } | |
2251 | ||
2252 | /* | |
2253 | Whether struct frame_extra_info is actually needed I'll have to figure | |
2254 | out as our frames are similar to rs6000 there is a possibility | |
2255 | i386 dosen't need it. */ | |
2256 | ||
5769d3cd | 2257 | /* Not the most efficent code in the world */ |
a78f21af | 2258 | static int |
5ae5f592 | 2259 | s390_fp_regnum (void) |
5769d3cd AC |
2260 | { |
2261 | int regno = S390_SP_REGNUM; | |
2262 | struct frame_extra_info fextra_info; | |
2263 | ||
2264 | CORE_ADDR pc = ADDR_BITS_REMOVE (read_register (S390_PC_REGNUM)); | |
2265 | ||
2266 | s390_get_frame_info (s390_sniff_pc_function_start (pc, NULL), &fextra_info, | |
2267 | NULL, 1); | |
2268 | if (fextra_info.frame_pointer_saved_pc) | |
2269 | regno = S390_FRAME_REGNUM; | |
2270 | return regno; | |
2271 | } | |
2272 | ||
a78f21af | 2273 | static CORE_ADDR |
5ae5f592 | 2274 | s390_read_fp (void) |
5769d3cd AC |
2275 | { |
2276 | return read_register (s390_fp_regnum ()); | |
2277 | } | |
2278 | ||
2279 | ||
4c8287ac JB |
2280 | static void |
2281 | s390_pop_frame_regular (struct frame_info *frame) | |
5769d3cd | 2282 | { |
4c8287ac JB |
2283 | int regnum; |
2284 | ||
8bedc050 | 2285 | write_register (S390_PC_REGNUM, DEPRECATED_FRAME_SAVED_PC (frame)); |
4c8287ac JB |
2286 | |
2287 | /* Restore any saved registers. */ | |
1b1d3794 | 2288 | if (deprecated_get_frame_saved_regs (frame)) |
1a889ea5 JB |
2289 | { |
2290 | for (regnum = 0; regnum < NUM_REGS; regnum++) | |
1b1d3794 | 2291 | if (deprecated_get_frame_saved_regs (frame)[regnum] != 0) |
1a889ea5 JB |
2292 | { |
2293 | ULONGEST value; | |
2294 | ||
1b1d3794 | 2295 | value = read_memory_unsigned_integer (deprecated_get_frame_saved_regs (frame)[regnum], |
12c266ea | 2296 | DEPRECATED_REGISTER_RAW_SIZE (regnum)); |
1a889ea5 JB |
2297 | write_register (regnum, value); |
2298 | } | |
2299 | ||
2300 | /* Actually cut back the stack. Remember that the SP's element of | |
2301 | saved_regs is the old SP itself, not the address at which it is | |
2302 | saved. */ | |
1b1d3794 | 2303 | write_register (S390_SP_REGNUM, deprecated_get_frame_saved_regs (frame)[S390_SP_REGNUM]); |
1a889ea5 | 2304 | } |
5769d3cd | 2305 | |
4c8287ac JB |
2306 | /* Throw away any cached frame information. */ |
2307 | flush_cached_frames (); | |
5769d3cd AC |
2308 | } |
2309 | ||
4c8287ac JB |
2310 | |
2311 | /* Destroy the innermost (Top-Of-Stack) stack frame, restoring the | |
2312 | machine state that was in effect before the frame was created. | |
2313 | Used in the contexts of the "return" command, and of | |
2314 | target function calls from the debugger. */ | |
a78f21af | 2315 | static void |
5ae5f592 | 2316 | s390_pop_frame (void) |
4c8287ac JB |
2317 | { |
2318 | /* This function checks for and handles generic dummy frames, and | |
2319 | calls back to our function for ordinary frames. */ | |
2320 | generic_pop_current_frame (s390_pop_frame_regular); | |
2321 | } | |
2322 | ||
2323 | ||
b0cf273e JB |
2324 | /* Dummy function calls. */ |
2325 | ||
78f8b424 JB |
2326 | /* Return non-zero if TYPE is an integer-like type, zero otherwise. |
2327 | "Integer-like" types are those that should be passed the way | |
2328 | integers are: integers, enums, ranges, characters, and booleans. */ | |
2329 | static int | |
2330 | is_integer_like (struct type *type) | |
2331 | { | |
2332 | enum type_code code = TYPE_CODE (type); | |
2333 | ||
2334 | return (code == TYPE_CODE_INT | |
2335 | || code == TYPE_CODE_ENUM | |
2336 | || code == TYPE_CODE_RANGE | |
2337 | || code == TYPE_CODE_CHAR | |
2338 | || code == TYPE_CODE_BOOL); | |
2339 | } | |
2340 | ||
78f8b424 JB |
2341 | /* Return non-zero if TYPE is a pointer-like type, zero otherwise. |
2342 | "Pointer-like" types are those that should be passed the way | |
2343 | pointers are: pointers and references. */ | |
2344 | static int | |
2345 | is_pointer_like (struct type *type) | |
2346 | { | |
2347 | enum type_code code = TYPE_CODE (type); | |
2348 | ||
2349 | return (code == TYPE_CODE_PTR | |
2350 | || code == TYPE_CODE_REF); | |
2351 | } | |
2352 | ||
2353 | ||
20a940cc JB |
2354 | /* Return non-zero if TYPE is a `float singleton' or `double |
2355 | singleton', zero otherwise. | |
2356 | ||
2357 | A `T singleton' is a struct type with one member, whose type is | |
2358 | either T or a `T singleton'. So, the following are all float | |
2359 | singletons: | |
2360 | ||
2361 | struct { float x }; | |
2362 | struct { struct { float x; } x; }; | |
2363 | struct { struct { struct { float x; } x; } x; }; | |
2364 | ||
2365 | ... and so on. | |
2366 | ||
b0cf273e JB |
2367 | All such structures are passed as if they were floats or doubles, |
2368 | as the (revised) ABI says. */ | |
20a940cc JB |
2369 | static int |
2370 | is_float_singleton (struct type *type) | |
2371 | { | |
b0cf273e JB |
2372 | if (TYPE_CODE (type) == TYPE_CODE_STRUCT && TYPE_NFIELDS (type) == 1) |
2373 | { | |
2374 | struct type *singleton_type = TYPE_FIELD_TYPE (type, 0); | |
2375 | CHECK_TYPEDEF (singleton_type); | |
2376 | ||
2377 | return (TYPE_CODE (singleton_type) == TYPE_CODE_FLT | |
2378 | || is_float_singleton (singleton_type)); | |
2379 | } | |
2380 | ||
2381 | return 0; | |
20a940cc JB |
2382 | } |
2383 | ||
2384 | ||
2385 | /* Return non-zero if TYPE is a struct-like type, zero otherwise. | |
2386 | "Struct-like" types are those that should be passed as structs are: | |
2387 | structs and unions. | |
2388 | ||
2389 | As an odd quirk, not mentioned in the ABI, GCC passes float and | |
2390 | double singletons as if they were a plain float, double, etc. (The | |
2391 | corresponding union types are handled normally.) So we exclude | |
2392 | those types here. *shrug* */ | |
2393 | static int | |
2394 | is_struct_like (struct type *type) | |
2395 | { | |
2396 | enum type_code code = TYPE_CODE (type); | |
2397 | ||
2398 | return (code == TYPE_CODE_UNION | |
2399 | || (code == TYPE_CODE_STRUCT && ! is_float_singleton (type))); | |
2400 | } | |
2401 | ||
2402 | ||
2403 | /* Return non-zero if TYPE is a float-like type, zero otherwise. | |
2404 | "Float-like" types are those that should be passed as | |
2405 | floating-point values are. | |
2406 | ||
2407 | You'd think this would just be floats, doubles, long doubles, etc. | |
2408 | But as an odd quirk, not mentioned in the ABI, GCC passes float and | |
2409 | double singletons as if they were a plain float, double, etc. (The | |
4d819d0e | 2410 | corresponding union types are handled normally.) So we include |
20a940cc JB |
2411 | those types here. *shrug* */ |
2412 | static int | |
2413 | is_float_like (struct type *type) | |
2414 | { | |
2415 | return (TYPE_CODE (type) == TYPE_CODE_FLT | |
2416 | || is_float_singleton (type)); | |
2417 | } | |
2418 | ||
2419 | ||
78f8b424 | 2420 | static int |
b0cf273e | 2421 | is_power_of_two (unsigned int n) |
78f8b424 | 2422 | { |
b0cf273e | 2423 | return ((n & (n - 1)) == 0); |
78f8b424 JB |
2424 | } |
2425 | ||
b0cf273e JB |
2426 | /* Return non-zero if TYPE should be passed as a pointer to a copy, |
2427 | zero otherwise. */ | |
4d819d0e | 2428 | static int |
b0cf273e | 2429 | s390_function_arg_pass_by_reference (struct type *type) |
4d819d0e JB |
2430 | { |
2431 | unsigned length = TYPE_LENGTH (type); | |
b0cf273e JB |
2432 | if (length > 8) |
2433 | return 1; | |
4d819d0e | 2434 | |
b0cf273e JB |
2435 | /* FIXME: All complex and vector types are also returned by reference. */ |
2436 | return is_struct_like (type) && !is_power_of_two (length); | |
4d819d0e JB |
2437 | } |
2438 | ||
b0cf273e JB |
2439 | /* Return non-zero if TYPE should be passed in a float register |
2440 | if possible. */ | |
78f8b424 | 2441 | static int |
b0cf273e | 2442 | s390_function_arg_float (struct type *type) |
78f8b424 | 2443 | { |
78f8b424 | 2444 | unsigned length = TYPE_LENGTH (type); |
b0cf273e JB |
2445 | if (length > 8) |
2446 | return 0; | |
78f8b424 | 2447 | |
b0cf273e | 2448 | return is_float_like (type); |
4d819d0e JB |
2449 | } |
2450 | ||
b0cf273e JB |
2451 | /* Return non-zero if TYPE should be passed in an integer register |
2452 | (or a pair of integer registers) if possible. */ | |
78f8b424 | 2453 | static int |
b0cf273e | 2454 | s390_function_arg_integer (struct type *type) |
78f8b424 | 2455 | { |
78f8b424 | 2456 | unsigned length = TYPE_LENGTH (type); |
b0cf273e JB |
2457 | if (length > 8) |
2458 | return 0; | |
78f8b424 | 2459 | |
b0cf273e JB |
2460 | return is_integer_like (type) |
2461 | || is_pointer_like (type) | |
2462 | || (is_struct_like (type) && is_power_of_two (length)); | |
78f8b424 JB |
2463 | } |
2464 | ||
78f8b424 JB |
2465 | /* Return ARG, a `SIMPLE_ARG', sign-extended or zero-extended to a full |
2466 | word as required for the ABI. */ | |
2467 | static LONGEST | |
2468 | extend_simple_arg (struct value *arg) | |
2469 | { | |
2470 | struct type *type = VALUE_TYPE (arg); | |
2471 | ||
2472 | /* Even structs get passed in the least significant bits of the | |
2473 | register / memory word. It's not really right to extract them as | |
2474 | an integer, but it does take care of the extension. */ | |
2475 | if (TYPE_UNSIGNED (type)) | |
2476 | return extract_unsigned_integer (VALUE_CONTENTS (arg), | |
2477 | TYPE_LENGTH (type)); | |
2478 | else | |
2479 | return extract_signed_integer (VALUE_CONTENTS (arg), | |
2480 | TYPE_LENGTH (type)); | |
2481 | } | |
2482 | ||
2483 | ||
78f8b424 JB |
2484 | /* Return the alignment required by TYPE. */ |
2485 | static int | |
2486 | alignment_of (struct type *type) | |
2487 | { | |
2488 | int alignment; | |
2489 | ||
2490 | if (is_integer_like (type) | |
2491 | || is_pointer_like (type) | |
2492 | || TYPE_CODE (type) == TYPE_CODE_FLT) | |
2493 | alignment = TYPE_LENGTH (type); | |
2494 | else if (TYPE_CODE (type) == TYPE_CODE_STRUCT | |
2495 | || TYPE_CODE (type) == TYPE_CODE_UNION) | |
2496 | { | |
2497 | int i; | |
2498 | ||
2499 | alignment = 1; | |
2500 | for (i = 0; i < TYPE_NFIELDS (type); i++) | |
2501 | { | |
2502 | int field_alignment = alignment_of (TYPE_FIELD_TYPE (type, i)); | |
2503 | ||
2504 | if (field_alignment > alignment) | |
2505 | alignment = field_alignment; | |
2506 | } | |
2507 | } | |
2508 | else | |
2509 | alignment = 1; | |
2510 | ||
2511 | /* Check that everything we ever return is a power of two. Lots of | |
2512 | code doesn't want to deal with aligning things to arbitrary | |
2513 | boundaries. */ | |
2514 | gdb_assert ((alignment & (alignment - 1)) == 0); | |
2515 | ||
2516 | return alignment; | |
2517 | } | |
2518 | ||
2519 | ||
2520 | /* Put the actual parameter values pointed to by ARGS[0..NARGS-1] in | |
ca557f44 AC |
2521 | place to be passed to a function, as specified by the "GNU/Linux |
2522 | for S/390 ELF Application Binary Interface Supplement". | |
78f8b424 JB |
2523 | |
2524 | SP is the current stack pointer. We must put arguments, links, | |
2525 | padding, etc. whereever they belong, and return the new stack | |
2526 | pointer value. | |
2527 | ||
2528 | If STRUCT_RETURN is non-zero, then the function we're calling is | |
2529 | going to return a structure by value; STRUCT_ADDR is the address of | |
2530 | a block we've allocated for it on the stack. | |
2531 | ||
2532 | Our caller has taken care of any type promotions needed to satisfy | |
2533 | prototypes or the old K&R argument-passing rules. */ | |
a78f21af | 2534 | static CORE_ADDR |
b0cf273e JB |
2535 | s390_push_dummy_call (struct gdbarch *gdbarch, CORE_ADDR func_addr, |
2536 | struct regcache *regcache, CORE_ADDR bp_addr, | |
2537 | int nargs, struct value **args, CORE_ADDR sp, | |
2538 | int struct_return, CORE_ADDR struct_addr) | |
5769d3cd | 2539 | { |
b0cf273e JB |
2540 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
2541 | int word_size = gdbarch_ptr_bit (gdbarch) / 8; | |
2542 | ULONGEST orig_sp; | |
78f8b424 | 2543 | int i; |
5769d3cd | 2544 | |
78f8b424 JB |
2545 | /* If the i'th argument is passed as a reference to a copy, then |
2546 | copy_addr[i] is the address of the copy we made. */ | |
2547 | CORE_ADDR *copy_addr = alloca (nargs * sizeof (CORE_ADDR)); | |
5769d3cd | 2548 | |
78f8b424 | 2549 | /* Build the reference-to-copy area. */ |
78f8b424 JB |
2550 | for (i = 0; i < nargs; i++) |
2551 | { | |
2552 | struct value *arg = args[i]; | |
2553 | struct type *type = VALUE_TYPE (arg); | |
2554 | unsigned length = TYPE_LENGTH (type); | |
5769d3cd | 2555 | |
b0cf273e | 2556 | if (s390_function_arg_pass_by_reference (type)) |
01c464e9 | 2557 | { |
78f8b424 | 2558 | sp -= length; |
5b03f266 | 2559 | sp = align_down (sp, alignment_of (type)); |
78f8b424 JB |
2560 | write_memory (sp, VALUE_CONTENTS (arg), length); |
2561 | copy_addr[i] = sp; | |
01c464e9 | 2562 | } |
5769d3cd | 2563 | } |
5769d3cd | 2564 | |
78f8b424 JB |
2565 | /* Reserve space for the parameter area. As a conservative |
2566 | simplification, we assume that everything will be passed on the | |
b0cf273e JB |
2567 | stack. Since every argument larger than 8 bytes will be |
2568 | passed by reference, we use this simple upper bound. */ | |
2569 | sp -= nargs * 8; | |
78f8b424 | 2570 | |
78f8b424 JB |
2571 | /* After all that, make sure it's still aligned on an eight-byte |
2572 | boundary. */ | |
5b03f266 | 2573 | sp = align_down (sp, 8); |
78f8b424 JB |
2574 | |
2575 | /* Finally, place the actual parameters, working from SP towards | |
2576 | higher addresses. The code above is supposed to reserve enough | |
2577 | space for this. */ | |
2578 | { | |
2579 | int fr = 0; | |
2580 | int gr = 2; | |
2581 | CORE_ADDR starg = sp; | |
2582 | ||
b0cf273e | 2583 | /* A struct is returned using general register 2. */ |
4d819d0e | 2584 | if (struct_return) |
b0cf273e JB |
2585 | { |
2586 | regcache_cooked_write_unsigned (regcache, S390_R0_REGNUM + gr, | |
2587 | struct_addr); | |
2588 | gr++; | |
2589 | } | |
4d819d0e | 2590 | |
78f8b424 JB |
2591 | for (i = 0; i < nargs; i++) |
2592 | { | |
2593 | struct value *arg = args[i]; | |
2594 | struct type *type = VALUE_TYPE (arg); | |
b0cf273e JB |
2595 | unsigned length = TYPE_LENGTH (type); |
2596 | ||
2597 | if (s390_function_arg_pass_by_reference (type)) | |
2598 | { | |
2599 | if (gr <= 6) | |
2600 | { | |
2601 | regcache_cooked_write_unsigned (regcache, S390_R0_REGNUM + gr, | |
2602 | copy_addr[i]); | |
2603 | gr++; | |
2604 | } | |
2605 | else | |
2606 | { | |
2607 | write_memory_unsigned_integer (starg, word_size, copy_addr[i]); | |
2608 | starg += word_size; | |
2609 | } | |
2610 | } | |
2611 | else if (s390_function_arg_float (type)) | |
2612 | { | |
2613 | /* The GNU/Linux for S/390 ABI uses FPRs 0 and 2 to pass arguments, | |
2614 | the GNU/Linux for zSeries ABI uses 0, 2, 4, and 6. */ | |
2615 | if (fr <= (tdep->abi == ABI_LINUX_S390 ? 2 : 6)) | |
2616 | { | |
2617 | /* When we store a single-precision value in an FP register, | |
2618 | it occupies the leftmost bits. */ | |
2619 | regcache_cooked_write_part (regcache, S390_F0_REGNUM + fr, | |
2620 | 0, length, VALUE_CONTENTS (arg)); | |
2621 | fr += 2; | |
2622 | } | |
2623 | else | |
2624 | { | |
2625 | /* When we store a single-precision value in a stack slot, | |
2626 | it occupies the rightmost bits. */ | |
2627 | starg = align_up (starg + length, word_size); | |
2628 | write_memory (starg - length, VALUE_CONTENTS (arg), length); | |
2629 | } | |
2630 | } | |
2631 | else if (s390_function_arg_integer (type) && length <= word_size) | |
2632 | { | |
2633 | if (gr <= 6) | |
2634 | { | |
2635 | /* Integer arguments are always extended to word size. */ | |
2636 | regcache_cooked_write_signed (regcache, S390_R0_REGNUM + gr, | |
2637 | extend_simple_arg (arg)); | |
2638 | gr++; | |
2639 | } | |
2640 | else | |
2641 | { | |
2642 | /* Integer arguments are always extended to word size. */ | |
2643 | write_memory_signed_integer (starg, word_size, | |
2644 | extend_simple_arg (arg)); | |
2645 | starg += word_size; | |
2646 | } | |
2647 | } | |
2648 | else if (s390_function_arg_integer (type) && length == 2*word_size) | |
2649 | { | |
2650 | if (gr <= 5) | |
2651 | { | |
2652 | regcache_cooked_write (regcache, S390_R0_REGNUM + gr, | |
2653 | VALUE_CONTENTS (arg)); | |
2654 | regcache_cooked_write (regcache, S390_R0_REGNUM + gr + 1, | |
2655 | VALUE_CONTENTS (arg) + word_size); | |
2656 | gr += 2; | |
2657 | } | |
2658 | else | |
2659 | { | |
2660 | /* If we skipped r6 because we couldn't fit a DOUBLE_ARG | |
2661 | in it, then don't go back and use it again later. */ | |
2662 | gr = 7; | |
2663 | ||
2664 | write_memory (starg, VALUE_CONTENTS (arg), length); | |
2665 | starg += length; | |
2666 | } | |
2667 | } | |
2668 | else | |
2669 | internal_error (__FILE__, __LINE__, "unknown argument type"); | |
78f8b424 JB |
2670 | } |
2671 | } | |
2672 | ||
2673 | /* Allocate the standard frame areas: the register save area, the | |
2674 | word reserved for the compiler (which seems kind of meaningless), | |
2675 | and the back chain pointer. */ | |
b0cf273e | 2676 | sp -= 16*word_size + 32; |
78f8b424 JB |
2677 | |
2678 | /* Write the back chain pointer into the first word of the stack | |
b0cf273e JB |
2679 | frame. This is needed to unwind across a dummy frame. */ |
2680 | regcache_cooked_read_unsigned (regcache, S390_SP_REGNUM, &orig_sp); | |
2681 | write_memory_unsigned_integer (sp, word_size, orig_sp); | |
2682 | ||
2683 | /* Store return address. */ | |
2684 | regcache_cooked_write_unsigned (regcache, S390_RETADDR_REGNUM, bp_addr); | |
2685 | ||
2686 | /* Store updated stack pointer. */ | |
2687 | regcache_cooked_write_unsigned (regcache, S390_SP_REGNUM, sp); | |
78f8b424 | 2688 | |
b0cf273e | 2689 | /* Return stack pointer. */ |
78f8b424 | 2690 | return sp; |
5769d3cd AC |
2691 | } |
2692 | ||
b0cf273e JB |
2693 | /* Assuming NEXT_FRAME->prev is a dummy, return the frame ID of that |
2694 | dummy frame. The frame ID's base needs to match the TOS value | |
2695 | returned by push_dummy_call, and the PC match the dummy frame's | |
2696 | breakpoint. */ | |
2697 | static struct frame_id | |
2698 | s390_unwind_dummy_id (struct gdbarch *gdbarch, struct frame_info *next_frame) | |
2699 | { | |
2700 | ULONGEST sp; | |
2701 | frame_unwind_unsigned_register (next_frame, S390_SP_REGNUM, &sp); | |
2702 | return frame_id_build (sp, frame_pc_unwind (next_frame)); | |
2703 | } | |
c8f9d51c | 2704 | |
4074e13c JB |
2705 | static CORE_ADDR |
2706 | s390_frame_align (struct gdbarch *gdbarch, CORE_ADDR addr) | |
2707 | { | |
2708 | /* Both the 32- and 64-bit ABI's say that the stack pointer should | |
2709 | always be aligned on an eight-byte boundary. */ | |
2710 | return (addr & -8); | |
2711 | } | |
2712 | ||
2713 | ||
b0cf273e JB |
2714 | /* Function return value access. */ |
2715 | ||
2716 | static enum return_value_convention | |
2717 | s390_return_value_convention (struct gdbarch *gdbarch, struct type *type) | |
c8f9d51c | 2718 | { |
b0cf273e JB |
2719 | int length = TYPE_LENGTH (type); |
2720 | if (length > 8) | |
2721 | return RETURN_VALUE_STRUCT_CONVENTION; | |
2722 | ||
2723 | switch (TYPE_CODE (type)) | |
2724 | { | |
2725 | case TYPE_CODE_STRUCT: | |
2726 | case TYPE_CODE_UNION: | |
2727 | case TYPE_CODE_ARRAY: | |
2728 | return RETURN_VALUE_STRUCT_CONVENTION; | |
c8f9d51c | 2729 | |
b0cf273e JB |
2730 | default: |
2731 | return RETURN_VALUE_REGISTER_CONVENTION; | |
2732 | } | |
c8f9d51c JB |
2733 | } |
2734 | ||
b0cf273e JB |
2735 | static enum return_value_convention |
2736 | s390_return_value (struct gdbarch *gdbarch, struct type *type, | |
2737 | struct regcache *regcache, void *out, const void *in) | |
5769d3cd | 2738 | { |
b0cf273e JB |
2739 | int word_size = gdbarch_ptr_bit (gdbarch) / 8; |
2740 | int length = TYPE_LENGTH (type); | |
2741 | enum return_value_convention rvc = | |
2742 | s390_return_value_convention (gdbarch, type); | |
2743 | if (in) | |
2744 | { | |
2745 | switch (rvc) | |
2746 | { | |
2747 | case RETURN_VALUE_REGISTER_CONVENTION: | |
2748 | if (TYPE_CODE (type) == TYPE_CODE_FLT) | |
2749 | { | |
2750 | /* When we store a single-precision value in an FP register, | |
2751 | it occupies the leftmost bits. */ | |
2752 | regcache_cooked_write_part (regcache, S390_F0_REGNUM, | |
2753 | 0, length, in); | |
2754 | } | |
2755 | else if (length <= word_size) | |
2756 | { | |
2757 | /* Integer arguments are always extended to word size. */ | |
2758 | if (TYPE_UNSIGNED (type)) | |
2759 | regcache_cooked_write_unsigned (regcache, S390_R2_REGNUM, | |
2760 | extract_unsigned_integer (in, length)); | |
2761 | else | |
2762 | regcache_cooked_write_signed (regcache, S390_R2_REGNUM, | |
2763 | extract_signed_integer (in, length)); | |
2764 | } | |
2765 | else if (length == 2*word_size) | |
2766 | { | |
2767 | regcache_cooked_write (regcache, S390_R2_REGNUM, in); | |
2768 | regcache_cooked_write (regcache, S390_R3_REGNUM, | |
2769 | (const char *)in + word_size); | |
2770 | } | |
2771 | else | |
2772 | internal_error (__FILE__, __LINE__, "invalid return type"); | |
2773 | break; | |
2774 | ||
2775 | case RETURN_VALUE_STRUCT_CONVENTION: | |
2776 | error ("Cannot set function return value."); | |
2777 | break; | |
2778 | } | |
2779 | } | |
2780 | else if (out) | |
2781 | { | |
2782 | switch (rvc) | |
2783 | { | |
2784 | case RETURN_VALUE_REGISTER_CONVENTION: | |
2785 | if (TYPE_CODE (type) == TYPE_CODE_FLT) | |
2786 | { | |
2787 | /* When we store a single-precision value in an FP register, | |
2788 | it occupies the leftmost bits. */ | |
2789 | regcache_cooked_read_part (regcache, S390_F0_REGNUM, | |
2790 | 0, length, out); | |
2791 | } | |
2792 | else if (length <= word_size) | |
2793 | { | |
2794 | /* Integer arguments occupy the rightmost bits. */ | |
2795 | regcache_cooked_read_part (regcache, S390_R2_REGNUM, | |
2796 | word_size - length, length, out); | |
2797 | } | |
2798 | else if (length == 2*word_size) | |
2799 | { | |
2800 | regcache_cooked_read (regcache, S390_R2_REGNUM, out); | |
2801 | regcache_cooked_read (regcache, S390_R3_REGNUM, | |
2802 | (char *)out + word_size); | |
2803 | } | |
2804 | else | |
2805 | internal_error (__FILE__, __LINE__, "invalid return type"); | |
2806 | break; | |
5769d3cd | 2807 | |
b0cf273e JB |
2808 | case RETURN_VALUE_STRUCT_CONVENTION: |
2809 | error ("Function return value unknown."); | |
2810 | break; | |
2811 | } | |
2812 | } | |
2813 | ||
2814 | return rvc; | |
2815 | } | |
5769d3cd AC |
2816 | |
2817 | ||
a78f21af | 2818 | static const unsigned char * |
5769d3cd AC |
2819 | s390_breakpoint_from_pc (CORE_ADDR *pcptr, int *lenptr) |
2820 | { | |
2821 | static unsigned char breakpoint[] = { 0x0, 0x1 }; | |
2822 | ||
2823 | *lenptr = sizeof (breakpoint); | |
2824 | return breakpoint; | |
2825 | } | |
2826 | ||
2827 | /* Advance PC across any function entry prologue instructions to reach some | |
2828 | "real" code. */ | |
a78f21af | 2829 | static CORE_ADDR |
5769d3cd AC |
2830 | s390_skip_prologue (CORE_ADDR pc) |
2831 | { | |
2832 | struct frame_extra_info fextra_info; | |
2833 | ||
2834 | s390_get_frame_info (pc, &fextra_info, NULL, 1); | |
2835 | return fextra_info.skip_prologue_function_start; | |
2836 | } | |
2837 | ||
5769d3cd AC |
2838 | /* Immediately after a function call, return the saved pc. |
2839 | Can't go through the frames for this because on some machines | |
2840 | the new frame is not set up until the new function executes | |
2841 | some instructions. */ | |
a78f21af | 2842 | static CORE_ADDR |
5769d3cd AC |
2843 | s390_saved_pc_after_call (struct frame_info *frame) |
2844 | { | |
2845 | return ADDR_BITS_REMOVE (read_register (S390_RETADDR_REGNUM)); | |
2846 | } | |
2847 | ||
2848 | static CORE_ADDR | |
2849 | s390_addr_bits_remove (CORE_ADDR addr) | |
2850 | { | |
2851 | return (addr) & 0x7fffffff; | |
2852 | } | |
2853 | ||
ffc65945 KB |
2854 | static int |
2855 | s390_address_class_type_flags (int byte_size, int dwarf2_addr_class) | |
2856 | { | |
2857 | if (byte_size == 4) | |
2858 | return TYPE_FLAG_ADDRESS_CLASS_1; | |
2859 | else | |
2860 | return 0; | |
2861 | } | |
2862 | ||
2863 | static const char * | |
2864 | s390_address_class_type_flags_to_name (struct gdbarch *gdbarch, int type_flags) | |
2865 | { | |
2866 | if (type_flags & TYPE_FLAG_ADDRESS_CLASS_1) | |
2867 | return "mode32"; | |
2868 | else | |
2869 | return NULL; | |
2870 | } | |
2871 | ||
a78f21af | 2872 | static int |
ffc65945 KB |
2873 | s390_address_class_name_to_type_flags (struct gdbarch *gdbarch, const char *name, |
2874 | int *type_flags_ptr) | |
2875 | { | |
2876 | if (strcmp (name, "mode32") == 0) | |
2877 | { | |
2878 | *type_flags_ptr = TYPE_FLAG_ADDRESS_CLASS_1; | |
2879 | return 1; | |
2880 | } | |
2881 | else | |
2882 | return 0; | |
2883 | } | |
2884 | ||
a78f21af | 2885 | static struct gdbarch * |
5769d3cd AC |
2886 | s390_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches) |
2887 | { | |
5769d3cd AC |
2888 | struct gdbarch *gdbarch; |
2889 | struct gdbarch_tdep *tdep; | |
5769d3cd AC |
2890 | |
2891 | /* First see if there is already a gdbarch that can satisfy the request. */ | |
2892 | arches = gdbarch_list_lookup_by_info (arches, &info); | |
2893 | if (arches != NULL) | |
2894 | return arches->gdbarch; | |
2895 | ||
2896 | /* None found: is the request for a s390 architecture? */ | |
2897 | if (info.bfd_arch_info->arch != bfd_arch_s390) | |
2898 | return NULL; /* No; then it's not for us. */ | |
2899 | ||
2900 | /* Yes: create a new gdbarch for the specified machine type. */ | |
d0f54f9d JB |
2901 | tdep = XCALLOC (1, struct gdbarch_tdep); |
2902 | gdbarch = gdbarch_alloc (&info, tdep); | |
5769d3cd | 2903 | |
a5afb99f AC |
2904 | /* NOTE: cagney/2002-12-06: This can be deleted when this arch is |
2905 | ready to unwind the PC first (see frame.c:get_prev_frame()). */ | |
0968aa8c | 2906 | set_gdbarch_deprecated_init_frame_pc (gdbarch, deprecated_init_frame_pc_default); |
a5afb99f | 2907 | |
5769d3cd | 2908 | set_gdbarch_believe_pcc_promotion (gdbarch, 0); |
4e409299 | 2909 | set_gdbarch_char_signed (gdbarch, 0); |
5769d3cd | 2910 | |
618ce49f | 2911 | set_gdbarch_deprecated_frame_chain (gdbarch, s390_frame_chain); |
f30ee0bc | 2912 | set_gdbarch_deprecated_frame_init_saved_regs (gdbarch, s390_frame_init_saved_regs); |
aaab4dba AC |
2913 | /* Amount PC must be decremented by after a breakpoint. This is |
2914 | often the number of bytes returned by BREAKPOINT_FROM_PC but not | |
2915 | always. */ | |
5769d3cd | 2916 | set_gdbarch_decr_pc_after_break (gdbarch, 2); |
749b82f6 | 2917 | set_gdbarch_deprecated_pop_frame (gdbarch, s390_pop_frame); |
5769d3cd AC |
2918 | /* Stack grows downward. */ |
2919 | set_gdbarch_inner_than (gdbarch, core_addr_lessthan); | |
5769d3cd AC |
2920 | set_gdbarch_breakpoint_from_pc (gdbarch, s390_breakpoint_from_pc); |
2921 | set_gdbarch_skip_prologue (gdbarch, s390_skip_prologue); | |
e9582e71 | 2922 | set_gdbarch_deprecated_init_extra_frame_info (gdbarch, s390_init_extra_frame_info); |
2ca6c561 | 2923 | set_gdbarch_deprecated_init_frame_pc_first (gdbarch, s390_init_frame_pc_first); |
0ba6dca9 | 2924 | set_gdbarch_deprecated_target_read_fp (gdbarch, s390_read_fp); |
d0f54f9d | 2925 | set_gdbarch_in_function_epilogue_p (gdbarch, s390_in_function_epilogue_p); |
5769d3cd AC |
2926 | /* This function that tells us whether the function invocation represented |
2927 | by FI does not have a frame on the stack associated with it. If it | |
2928 | does not, FRAMELESS is set to 1, else 0. */ | |
19772a2c | 2929 | set_gdbarch_deprecated_frameless_function_invocation (gdbarch, s390_frameless_function_invocation); |
5769d3cd | 2930 | /* Return saved PC from a frame */ |
8bedc050 | 2931 | set_gdbarch_deprecated_frame_saved_pc (gdbarch, s390_frame_saved_pc); |
618ce49f AC |
2932 | /* DEPRECATED_FRAME_CHAIN takes a frame's nominal address and |
2933 | produces the frame's chain-pointer. */ | |
2934 | set_gdbarch_deprecated_frame_chain (gdbarch, s390_frame_chain); | |
6913c89a | 2935 | set_gdbarch_deprecated_saved_pc_after_call (gdbarch, s390_saved_pc_after_call); |
5769d3cd AC |
2936 | set_gdbarch_pc_regnum (gdbarch, S390_PC_REGNUM); |
2937 | set_gdbarch_sp_regnum (gdbarch, S390_SP_REGNUM); | |
d0f54f9d JB |
2938 | set_gdbarch_deprecated_fp_regnum (gdbarch, S390_SP_REGNUM); |
2939 | set_gdbarch_fp0_regnum (gdbarch, S390_F0_REGNUM); | |
5769d3cd | 2940 | set_gdbarch_num_regs (gdbarch, S390_NUM_REGS); |
d0f54f9d | 2941 | set_gdbarch_num_pseudo_regs (gdbarch, S390_NUM_PSEUDO_REGS); |
5769d3cd | 2942 | set_gdbarch_register_name (gdbarch, s390_register_name); |
d0f54f9d JB |
2943 | set_gdbarch_register_type (gdbarch, s390_register_type); |
2944 | set_gdbarch_stab_reg_to_regnum (gdbarch, s390_dwarf_reg_to_regnum); | |
2945 | set_gdbarch_dwarf_reg_to_regnum (gdbarch, s390_dwarf_reg_to_regnum); | |
2946 | set_gdbarch_dwarf2_reg_to_regnum (gdbarch, s390_dwarf_reg_to_regnum); | |
2947 | set_gdbarch_convert_register_p (gdbarch, s390_convert_register_p); | |
2948 | set_gdbarch_register_to_value (gdbarch, s390_register_to_value); | |
2949 | set_gdbarch_value_to_register (gdbarch, s390_value_to_register); | |
2950 | set_gdbarch_register_reggroup_p (gdbarch, s390_register_reggroup_p); | |
2951 | set_gdbarch_regset_from_core_section (gdbarch, | |
2952 | s390_regset_from_core_section); | |
5769d3cd | 2953 | |
b0cf273e JB |
2954 | /* Inferior function calls. */ |
2955 | set_gdbarch_push_dummy_call (gdbarch, s390_push_dummy_call); | |
2956 | set_gdbarch_unwind_dummy_id (gdbarch, s390_unwind_dummy_id); | |
4074e13c | 2957 | set_gdbarch_frame_align (gdbarch, s390_frame_align); |
b0cf273e | 2958 | set_gdbarch_return_value (gdbarch, s390_return_value); |
5769d3cd AC |
2959 | |
2960 | switch (info.bfd_arch_info->mach) | |
2961 | { | |
b8b8b047 | 2962 | case bfd_mach_s390_31: |
b0cf273e JB |
2963 | tdep->abi = ABI_LINUX_S390; |
2964 | ||
d0f54f9d JB |
2965 | tdep->gregset = &s390_gregset; |
2966 | tdep->sizeof_gregset = s390_sizeof_gregset; | |
2967 | tdep->fpregset = &s390_fpregset; | |
2968 | tdep->sizeof_fpregset = s390_sizeof_fpregset; | |
5769d3cd AC |
2969 | |
2970 | set_gdbarch_addr_bits_remove (gdbarch, s390_addr_bits_remove); | |
d0f54f9d JB |
2971 | set_gdbarch_pseudo_register_read (gdbarch, s390_pseudo_register_read); |
2972 | set_gdbarch_pseudo_register_write (gdbarch, s390_pseudo_register_write); | |
5769d3cd | 2973 | break; |
b8b8b047 | 2974 | case bfd_mach_s390_64: |
b0cf273e JB |
2975 | tdep->abi = ABI_LINUX_ZSERIES; |
2976 | ||
d0f54f9d JB |
2977 | tdep->gregset = &s390x_gregset; |
2978 | tdep->sizeof_gregset = s390x_sizeof_gregset; | |
2979 | tdep->fpregset = &s390_fpregset; | |
2980 | tdep->sizeof_fpregset = s390_sizeof_fpregset; | |
5769d3cd AC |
2981 | |
2982 | set_gdbarch_long_bit (gdbarch, 64); | |
2983 | set_gdbarch_long_long_bit (gdbarch, 64); | |
2984 | set_gdbarch_ptr_bit (gdbarch, 64); | |
d0f54f9d JB |
2985 | set_gdbarch_pseudo_register_read (gdbarch, s390x_pseudo_register_read); |
2986 | set_gdbarch_pseudo_register_write (gdbarch, s390x_pseudo_register_write); | |
ffc65945 KB |
2987 | set_gdbarch_address_class_type_flags (gdbarch, |
2988 | s390_address_class_type_flags); | |
2989 | set_gdbarch_address_class_type_flags_to_name (gdbarch, | |
2990 | s390_address_class_type_flags_to_name); | |
2991 | set_gdbarch_address_class_name_to_type_flags (gdbarch, | |
2992 | s390_address_class_name_to_type_flags); | |
5769d3cd AC |
2993 | break; |
2994 | } | |
2995 | ||
36482093 AC |
2996 | set_gdbarch_print_insn (gdbarch, print_insn_s390); |
2997 | ||
5769d3cd AC |
2998 | return gdbarch; |
2999 | } | |
3000 | ||
3001 | ||
3002 | ||
a78f21af AC |
3003 | extern initialize_file_ftype _initialize_s390_tdep; /* -Wmissing-prototypes */ |
3004 | ||
5769d3cd | 3005 | void |
5ae5f592 | 3006 | _initialize_s390_tdep (void) |
5769d3cd AC |
3007 | { |
3008 | ||
3009 | /* Hook us into the gdbarch mechanism. */ | |
3010 | register_gdbarch_init (bfd_arch_s390, s390_gdbarch_init); | |
5769d3cd | 3011 | } |