1 /* Target-dependent code for GDB, the GNU debugger.
3 Copyright (C) 2001-2012 Free Software Foundation, Inc.
5 Contributed by D.J. Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com)
6 for IBM Deutschland Entwicklung GmbH, IBM Corporation.
8 This file is part of GDB.
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 3 of the License, or
13 (at your option) any later version.
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.
20 You should have received a copy of the GNU General Public License
21 along with this program. If not, see <http://www.gnu.org/licenses/>. */
24 #include "arch-utils.h"
32 #include "floatformat.h"
34 #include "trad-frame.h"
35 #include "frame-base.h"
36 #include "frame-unwind.h"
37 #include "dwarf2-frame.h"
38 #include "reggroups.h"
41 #include "gdb_assert.h"
43 #include "solib-svr4.h"
44 #include "prologue-value.h"
45 #include "linux-tdep.h"
46 #include "s390-tdep.h"
48 #include "stap-probe.h"
51 #include "user-regs.h"
52 #include "cli/cli-utils.h"
55 #include "features/s390-linux32.c"
56 #include "features/s390-linux32v1.c"
57 #include "features/s390-linux32v2.c"
58 #include "features/s390-linux64.c"
59 #include "features/s390-linux64v1.c"
60 #include "features/s390-linux64v2.c"
61 #include "features/s390x-linux64.c"
62 #include "features/s390x-linux64v1.c"
63 #include "features/s390x-linux64v2.c"
65 /* The tdep structure. */
70 enum { ABI_LINUX_S390, ABI_LINUX_ZSERIES } abi;
72 /* Pseudo register numbers. */
77 /* Core file register sets. */
78 const struct regset *gregset;
81 const struct regset *fpregset;
86 /* ABI call-saved register information. */
89 s390_register_call_saved (struct gdbarch *gdbarch, int regnum)
91 struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
96 if ((regnum >= S390_R6_REGNUM && regnum <= S390_R15_REGNUM)
97 || regnum == S390_F4_REGNUM || regnum == S390_F6_REGNUM
98 || regnum == S390_A0_REGNUM)
103 case ABI_LINUX_ZSERIES:
104 if ((regnum >= S390_R6_REGNUM && regnum <= S390_R15_REGNUM)
105 || (regnum >= S390_F8_REGNUM && regnum <= S390_F15_REGNUM)
106 || (regnum >= S390_A0_REGNUM && regnum <= S390_A1_REGNUM))
116 s390_cannot_store_register (struct gdbarch *gdbarch, int regnum)
118 /* The last-break address is read-only. */
119 return regnum == S390_LAST_BREAK_REGNUM;
123 s390_write_pc (struct regcache *regcache, CORE_ADDR pc)
125 struct gdbarch *gdbarch = get_regcache_arch (regcache);
126 struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
128 regcache_cooked_write_unsigned (regcache, tdep->pc_regnum, pc);
130 /* Set special SYSTEM_CALL register to 0 to prevent the kernel from
131 messing with the PC we just installed, if we happen to be within
132 an interrupted system call that the kernel wants to restart.
134 Note that after we return from the dummy call, the SYSTEM_CALL and
135 ORIG_R2 registers will be automatically restored, and the kernel
136 continues to restart the system call at this point. */
137 if (register_size (gdbarch, S390_SYSTEM_CALL_REGNUM) > 0)
138 regcache_cooked_write_unsigned (regcache, S390_SYSTEM_CALL_REGNUM, 0);
142 /* DWARF Register Mapping. */
144 static int s390_dwarf_regmap[] =
146 /* General Purpose Registers. */
147 S390_R0_REGNUM, S390_R1_REGNUM, S390_R2_REGNUM, S390_R3_REGNUM,
148 S390_R4_REGNUM, S390_R5_REGNUM, S390_R6_REGNUM, S390_R7_REGNUM,
149 S390_R8_REGNUM, S390_R9_REGNUM, S390_R10_REGNUM, S390_R11_REGNUM,
150 S390_R12_REGNUM, S390_R13_REGNUM, S390_R14_REGNUM, S390_R15_REGNUM,
152 /* Floating Point Registers. */
153 S390_F0_REGNUM, S390_F2_REGNUM, S390_F4_REGNUM, S390_F6_REGNUM,
154 S390_F1_REGNUM, S390_F3_REGNUM, S390_F5_REGNUM, S390_F7_REGNUM,
155 S390_F8_REGNUM, S390_F10_REGNUM, S390_F12_REGNUM, S390_F14_REGNUM,
156 S390_F9_REGNUM, S390_F11_REGNUM, S390_F13_REGNUM, S390_F15_REGNUM,
158 /* Control Registers (not mapped). */
159 -1, -1, -1, -1, -1, -1, -1, -1,
160 -1, -1, -1, -1, -1, -1, -1, -1,
162 /* Access Registers. */
163 S390_A0_REGNUM, S390_A1_REGNUM, S390_A2_REGNUM, S390_A3_REGNUM,
164 S390_A4_REGNUM, S390_A5_REGNUM, S390_A6_REGNUM, S390_A7_REGNUM,
165 S390_A8_REGNUM, S390_A9_REGNUM, S390_A10_REGNUM, S390_A11_REGNUM,
166 S390_A12_REGNUM, S390_A13_REGNUM, S390_A14_REGNUM, S390_A15_REGNUM,
168 /* Program Status Word. */
172 /* GPR Lower Half Access. */
173 S390_R0_REGNUM, S390_R1_REGNUM, S390_R2_REGNUM, S390_R3_REGNUM,
174 S390_R4_REGNUM, S390_R5_REGNUM, S390_R6_REGNUM, S390_R7_REGNUM,
175 S390_R8_REGNUM, S390_R9_REGNUM, S390_R10_REGNUM, S390_R11_REGNUM,
176 S390_R12_REGNUM, S390_R13_REGNUM, S390_R14_REGNUM, S390_R15_REGNUM,
178 /* GNU/Linux-specific registers (not mapped). */
182 /* Convert DWARF register number REG to the appropriate register
183 number used by GDB. */
185 s390_dwarf_reg_to_regnum (struct gdbarch *gdbarch, int reg)
187 struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
189 /* In a 32-on-64 debug scenario, debug info refers to the full 64-bit
190 GPRs. Note that call frame information still refers to the 32-bit
191 lower halves, because s390_adjust_frame_regnum uses register numbers
192 66 .. 81 to access GPRs. */
193 if (tdep->gpr_full_regnum != -1 && reg >= 0 && reg < 16)
194 return tdep->gpr_full_regnum + reg;
196 if (reg >= 0 && reg < ARRAY_SIZE (s390_dwarf_regmap))
197 return s390_dwarf_regmap[reg];
199 warning (_("Unmapped DWARF Register #%d encountered."), reg);
203 /* Translate a .eh_frame register to DWARF register, or adjust a
204 .debug_frame register. */
206 s390_adjust_frame_regnum (struct gdbarch *gdbarch, int num, int eh_frame_p)
208 /* See s390_dwarf_reg_to_regnum for comments. */
209 return (num >= 0 && num < 16)? num + 66 : num;
213 /* Pseudo registers. */
216 s390_pseudo_register_name (struct gdbarch *gdbarch, int regnum)
218 struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
220 if (regnum == tdep->pc_regnum)
223 if (regnum == tdep->cc_regnum)
226 if (tdep->gpr_full_regnum != -1
227 && regnum >= tdep->gpr_full_regnum
228 && regnum < tdep->gpr_full_regnum + 16)
230 static const char *full_name[] = {
231 "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
232 "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15"
234 return full_name[regnum - tdep->gpr_full_regnum];
237 internal_error (__FILE__, __LINE__, _("invalid regnum"));
241 s390_pseudo_register_type (struct gdbarch *gdbarch, int regnum)
243 struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
245 if (regnum == tdep->pc_regnum)
246 return builtin_type (gdbarch)->builtin_func_ptr;
248 if (regnum == tdep->cc_regnum)
249 return builtin_type (gdbarch)->builtin_int;
251 if (tdep->gpr_full_regnum != -1
252 && regnum >= tdep->gpr_full_regnum
253 && regnum < tdep->gpr_full_regnum + 16)
254 return builtin_type (gdbarch)->builtin_uint64;
256 internal_error (__FILE__, __LINE__, _("invalid regnum"));
259 static enum register_status
260 s390_pseudo_register_read (struct gdbarch *gdbarch, struct regcache *regcache,
261 int regnum, gdb_byte *buf)
263 struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
264 enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
265 int regsize = register_size (gdbarch, regnum);
268 if (regnum == tdep->pc_regnum)
270 enum register_status status;
272 status = regcache_raw_read_unsigned (regcache, S390_PSWA_REGNUM, &val);
273 if (status == REG_VALID)
275 if (register_size (gdbarch, S390_PSWA_REGNUM) == 4)
277 store_unsigned_integer (buf, regsize, byte_order, val);
282 if (regnum == tdep->cc_regnum)
284 enum register_status status;
286 status = regcache_raw_read_unsigned (regcache, S390_PSWM_REGNUM, &val);
287 if (status == REG_VALID)
289 if (register_size (gdbarch, S390_PSWA_REGNUM) == 4)
290 val = (val >> 12) & 3;
292 val = (val >> 44) & 3;
293 store_unsigned_integer (buf, regsize, byte_order, val);
298 if (tdep->gpr_full_regnum != -1
299 && regnum >= tdep->gpr_full_regnum
300 && regnum < tdep->gpr_full_regnum + 16)
302 enum register_status status;
305 regnum -= tdep->gpr_full_regnum;
307 status = regcache_raw_read_unsigned (regcache, S390_R0_REGNUM + regnum, &val);
308 if (status == REG_VALID)
309 status = regcache_raw_read_unsigned (regcache, S390_R0_UPPER_REGNUM + regnum,
311 if (status == REG_VALID)
313 val |= val_upper << 32;
314 store_unsigned_integer (buf, regsize, byte_order, val);
319 internal_error (__FILE__, __LINE__, _("invalid regnum"));
323 s390_pseudo_register_write (struct gdbarch *gdbarch, struct regcache *regcache,
324 int regnum, const gdb_byte *buf)
326 struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
327 enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
328 int regsize = register_size (gdbarch, regnum);
331 if (regnum == tdep->pc_regnum)
333 val = extract_unsigned_integer (buf, regsize, byte_order);
334 if (register_size (gdbarch, S390_PSWA_REGNUM) == 4)
336 regcache_raw_read_unsigned (regcache, S390_PSWA_REGNUM, &psw);
337 val = (psw & 0x80000000) | (val & 0x7fffffff);
339 regcache_raw_write_unsigned (regcache, S390_PSWA_REGNUM, val);
343 if (regnum == tdep->cc_regnum)
345 val = extract_unsigned_integer (buf, regsize, byte_order);
346 regcache_raw_read_unsigned (regcache, S390_PSWM_REGNUM, &psw);
347 if (register_size (gdbarch, S390_PSWA_REGNUM) == 4)
348 val = (psw & ~((ULONGEST)3 << 12)) | ((val & 3) << 12);
350 val = (psw & ~((ULONGEST)3 << 44)) | ((val & 3) << 44);
351 regcache_raw_write_unsigned (regcache, S390_PSWM_REGNUM, val);
355 if (tdep->gpr_full_regnum != -1
356 && regnum >= tdep->gpr_full_regnum
357 && regnum < tdep->gpr_full_regnum + 16)
359 regnum -= tdep->gpr_full_regnum;
360 val = extract_unsigned_integer (buf, regsize, byte_order);
361 regcache_raw_write_unsigned (regcache, S390_R0_REGNUM + regnum,
363 regcache_raw_write_unsigned (regcache, S390_R0_UPPER_REGNUM + regnum,
368 internal_error (__FILE__, __LINE__, _("invalid regnum"));
371 /* 'float' values are stored in the upper half of floating-point
372 registers, even though we are otherwise a big-endian platform. */
374 static struct value *
375 s390_value_from_register (struct type *type, int regnum,
376 struct frame_info *frame)
378 struct value *value = default_value_from_register (type, regnum, frame);
379 int len = TYPE_LENGTH (check_typedef (type));
381 if (regnum >= S390_F0_REGNUM && regnum <= S390_F15_REGNUM && len < 8)
382 set_value_offset (value, 0);
387 /* Register groups. */
390 s390_pseudo_register_reggroup_p (struct gdbarch *gdbarch, int regnum,
391 struct reggroup *group)
393 struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
395 /* We usually save/restore the whole PSW, which includes PC and CC.
396 However, some older gdbservers may not support saving/restoring
397 the whole PSW yet, and will return an XML register description
398 excluding those from the save/restore register groups. In those
399 cases, we still need to explicitly save/restore PC and CC in order
400 to push or pop frames. Since this doesn't hurt anything if we
401 already save/restore the whole PSW (it's just redundant), we add
402 PC and CC at this point unconditionally. */
403 if (group == save_reggroup || group == restore_reggroup)
404 return regnum == tdep->pc_regnum || regnum == tdep->cc_regnum;
406 return default_register_reggroup_p (gdbarch, regnum, group);
410 /* Core file register sets. */
412 int s390_regmap_gregset[S390_NUM_REGS] =
414 /* Program Status Word. */
416 /* General Purpose Registers. */
417 0x08, 0x0c, 0x10, 0x14,
418 0x18, 0x1c, 0x20, 0x24,
419 0x28, 0x2c, 0x30, 0x34,
420 0x38, 0x3c, 0x40, 0x44,
421 /* Access Registers. */
422 0x48, 0x4c, 0x50, 0x54,
423 0x58, 0x5c, 0x60, 0x64,
424 0x68, 0x6c, 0x70, 0x74,
425 0x78, 0x7c, 0x80, 0x84,
426 /* Floating Point Control Word. */
428 /* Floating Point Registers. */
429 -1, -1, -1, -1, -1, -1, -1, -1,
430 -1, -1, -1, -1, -1, -1, -1, -1,
431 /* GPR Uppper Halves. */
432 -1, -1, -1, -1, -1, -1, -1, -1,
433 -1, -1, -1, -1, -1, -1, -1, -1,
434 /* GNU/Linux-specific optional "registers". */
438 int s390x_regmap_gregset[S390_NUM_REGS] =
440 /* Program Status Word. */
442 /* General Purpose Registers. */
443 0x10, 0x18, 0x20, 0x28,
444 0x30, 0x38, 0x40, 0x48,
445 0x50, 0x58, 0x60, 0x68,
446 0x70, 0x78, 0x80, 0x88,
447 /* Access Registers. */
448 0x90, 0x94, 0x98, 0x9c,
449 0xa0, 0xa4, 0xa8, 0xac,
450 0xb0, 0xb4, 0xb8, 0xbc,
451 0xc0, 0xc4, 0xc8, 0xcc,
452 /* Floating Point Control Word. */
454 /* Floating Point Registers. */
455 -1, -1, -1, -1, -1, -1, -1, -1,
456 -1, -1, -1, -1, -1, -1, -1, -1,
457 /* GPR Uppper Halves. */
458 0x10, 0x18, 0x20, 0x28,
459 0x30, 0x38, 0x40, 0x48,
460 0x50, 0x58, 0x60, 0x68,
461 0x70, 0x78, 0x80, 0x88,
462 /* GNU/Linux-specific optional "registers". */
466 int s390_regmap_fpregset[S390_NUM_REGS] =
468 /* Program Status Word. */
470 /* General Purpose Registers. */
471 -1, -1, -1, -1, -1, -1, -1, -1,
472 -1, -1, -1, -1, -1, -1, -1, -1,
473 /* Access Registers. */
474 -1, -1, -1, -1, -1, -1, -1, -1,
475 -1, -1, -1, -1, -1, -1, -1, -1,
476 /* Floating Point Control Word. */
478 /* Floating Point Registers. */
479 0x08, 0x10, 0x18, 0x20,
480 0x28, 0x30, 0x38, 0x40,
481 0x48, 0x50, 0x58, 0x60,
482 0x68, 0x70, 0x78, 0x80,
483 /* GPR Uppper Halves. */
484 -1, -1, -1, -1, -1, -1, -1, -1,
485 -1, -1, -1, -1, -1, -1, -1, -1,
486 /* GNU/Linux-specific optional "registers". */
490 int s390_regmap_upper[S390_NUM_REGS] =
492 /* Program Status Word. */
494 /* General Purpose Registers. */
495 -1, -1, -1, -1, -1, -1, -1, -1,
496 -1, -1, -1, -1, -1, -1, -1, -1,
497 /* Access Registers. */
498 -1, -1, -1, -1, -1, -1, -1, -1,
499 -1, -1, -1, -1, -1, -1, -1, -1,
500 /* Floating Point Control Word. */
502 /* Floating Point Registers. */
503 -1, -1, -1, -1, -1, -1, -1, -1,
504 -1, -1, -1, -1, -1, -1, -1, -1,
505 /* GPR Uppper Halves. */
506 0x00, 0x04, 0x08, 0x0c,
507 0x10, 0x14, 0x18, 0x1c,
508 0x20, 0x24, 0x28, 0x2c,
509 0x30, 0x34, 0x38, 0x3c,
510 /* GNU/Linux-specific optional "registers". */
514 int s390_regmap_last_break[S390_NUM_REGS] =
516 /* Program Status Word. */
518 /* General Purpose Registers. */
519 -1, -1, -1, -1, -1, -1, -1, -1,
520 -1, -1, -1, -1, -1, -1, -1, -1,
521 /* Access Registers. */
522 -1, -1, -1, -1, -1, -1, -1, -1,
523 -1, -1, -1, -1, -1, -1, -1, -1,
524 /* Floating Point Control Word. */
526 /* Floating Point Registers. */
527 -1, -1, -1, -1, -1, -1, -1, -1,
528 -1, -1, -1, -1, -1, -1, -1, -1,
529 /* GPR Uppper Halves. */
530 -1, -1, -1, -1, -1, -1, -1, -1,
531 -1, -1, -1, -1, -1, -1, -1, -1,
532 /* GNU/Linux-specific optional "registers". */
536 int s390x_regmap_last_break[S390_NUM_REGS] =
538 /* Program Status Word. */
540 /* General Purpose Registers. */
541 -1, -1, -1, -1, -1, -1, -1, -1,
542 -1, -1, -1, -1, -1, -1, -1, -1,
543 /* Access Registers. */
544 -1, -1, -1, -1, -1, -1, -1, -1,
545 -1, -1, -1, -1, -1, -1, -1, -1,
546 /* Floating Point Control Word. */
548 /* Floating Point Registers. */
549 -1, -1, -1, -1, -1, -1, -1, -1,
550 -1, -1, -1, -1, -1, -1, -1, -1,
551 /* GPR Uppper Halves. */
552 -1, -1, -1, -1, -1, -1, -1, -1,
553 -1, -1, -1, -1, -1, -1, -1, -1,
554 /* GNU/Linux-specific optional "registers". */
558 int s390_regmap_system_call[S390_NUM_REGS] =
560 /* Program Status Word. */
562 /* General Purpose Registers. */
563 -1, -1, -1, -1, -1, -1, -1, -1,
564 -1, -1, -1, -1, -1, -1, -1, -1,
565 /* Access Registers. */
566 -1, -1, -1, -1, -1, -1, -1, -1,
567 -1, -1, -1, -1, -1, -1, -1, -1,
568 /* Floating Point Control Word. */
570 /* Floating Point Registers. */
571 -1, -1, -1, -1, -1, -1, -1, -1,
572 -1, -1, -1, -1, -1, -1, -1, -1,
573 /* GPR Uppper Halves. */
574 -1, -1, -1, -1, -1, -1, -1, -1,
575 -1, -1, -1, -1, -1, -1, -1, -1,
576 /* GNU/Linux-specific optional "registers". */
580 /* Supply register REGNUM from the register set REGSET to register cache
581 REGCACHE. If REGNUM is -1, do this for all registers in REGSET. */
583 s390_supply_regset (const struct regset *regset, struct regcache *regcache,
584 int regnum, const void *regs, size_t len)
586 const int *offset = regset->descr;
589 for (i = 0; i < S390_NUM_REGS; i++)
591 if ((regnum == i || regnum == -1) && offset[i] != -1)
592 regcache_raw_supply (regcache, i, (const char *)regs + offset[i]);
596 /* Collect register REGNUM from the register cache REGCACHE and store
597 it in the buffer specified by REGS and LEN as described by the
598 general-purpose register set REGSET. If REGNUM is -1, do this for
599 all registers in REGSET. */
601 s390_collect_regset (const struct regset *regset,
602 const struct regcache *regcache,
603 int regnum, void *regs, size_t len)
605 const int *offset = regset->descr;
608 for (i = 0; i < S390_NUM_REGS; i++)
610 if ((regnum == i || regnum == -1) && offset[i] != -1)
611 regcache_raw_collect (regcache, i, (char *)regs + offset[i]);
615 static const struct regset s390_gregset = {
621 static const struct regset s390x_gregset = {
622 s390x_regmap_gregset,
627 static const struct regset s390_fpregset = {
628 s390_regmap_fpregset,
633 static const struct regset s390_upper_regset = {
639 static const struct regset s390_last_break_regset = {
640 s390_regmap_last_break,
645 static const struct regset s390x_last_break_regset = {
646 s390x_regmap_last_break,
651 static const struct regset s390_system_call_regset = {
652 s390_regmap_system_call,
657 static struct core_regset_section s390_linux32_regset_sections[] =
659 { ".reg", s390_sizeof_gregset, "general-purpose" },
660 { ".reg2", s390_sizeof_fpregset, "floating-point" },
664 static struct core_regset_section s390_linux32v1_regset_sections[] =
666 { ".reg", s390_sizeof_gregset, "general-purpose" },
667 { ".reg2", s390_sizeof_fpregset, "floating-point" },
668 { ".reg-s390-last-break", 8, "s390 last-break address" },
672 static struct core_regset_section s390_linux32v2_regset_sections[] =
674 { ".reg", s390_sizeof_gregset, "general-purpose" },
675 { ".reg2", s390_sizeof_fpregset, "floating-point" },
676 { ".reg-s390-last-break", 8, "s390 last-break address" },
677 { ".reg-s390-system-call", 4, "s390 system-call" },
681 static struct core_regset_section s390_linux64_regset_sections[] =
683 { ".reg", s390_sizeof_gregset, "general-purpose" },
684 { ".reg2", s390_sizeof_fpregset, "floating-point" },
685 { ".reg-s390-high-gprs", 16*4, "s390 GPR upper halves" },
689 static struct core_regset_section s390_linux64v1_regset_sections[] =
691 { ".reg", s390_sizeof_gregset, "general-purpose" },
692 { ".reg2", s390_sizeof_fpregset, "floating-point" },
693 { ".reg-s390-high-gprs", 16*4, "s390 GPR upper halves" },
694 { ".reg-s390-last-break", 8, "s930 last-break address" },
698 static struct core_regset_section s390_linux64v2_regset_sections[] =
700 { ".reg", s390_sizeof_gregset, "general-purpose" },
701 { ".reg2", s390_sizeof_fpregset, "floating-point" },
702 { ".reg-s390-high-gprs", 16*4, "s390 GPR upper halves" },
703 { ".reg-s390-last-break", 8, "s930 last-break address" },
704 { ".reg-s390-system-call", 4, "s390 system-call" },
708 static struct core_regset_section s390x_linux64_regset_sections[] =
710 { ".reg", s390x_sizeof_gregset, "general-purpose" },
711 { ".reg2", s390_sizeof_fpregset, "floating-point" },
715 static struct core_regset_section s390x_linux64v1_regset_sections[] =
717 { ".reg", s390x_sizeof_gregset, "general-purpose" },
718 { ".reg2", s390_sizeof_fpregset, "floating-point" },
719 { ".reg-s390-last-break", 8, "s930 last-break address" },
723 static struct core_regset_section s390x_linux64v2_regset_sections[] =
725 { ".reg", s390x_sizeof_gregset, "general-purpose" },
726 { ".reg2", s390_sizeof_fpregset, "floating-point" },
727 { ".reg-s390-last-break", 8, "s930 last-break address" },
728 { ".reg-s390-system-call", 4, "s390 system-call" },
733 /* Return the appropriate register set for the core section identified
734 by SECT_NAME and SECT_SIZE. */
735 static const struct regset *
736 s390_regset_from_core_section (struct gdbarch *gdbarch,
737 const char *sect_name, size_t sect_size)
739 struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
741 if (strcmp (sect_name, ".reg") == 0 && sect_size >= tdep->sizeof_gregset)
742 return tdep->gregset;
744 if (strcmp (sect_name, ".reg2") == 0 && sect_size >= tdep->sizeof_fpregset)
745 return tdep->fpregset;
747 if (strcmp (sect_name, ".reg-s390-high-gprs") == 0 && sect_size >= 16*4)
748 return &s390_upper_regset;
750 if (strcmp (sect_name, ".reg-s390-last-break") == 0 && sect_size >= 8)
751 return (gdbarch_ptr_bit (gdbarch) == 32
752 ? &s390_last_break_regset : &s390x_last_break_regset);
754 if (strcmp (sect_name, ".reg-s390-system-call") == 0 && sect_size >= 4)
755 return &s390_system_call_regset;
760 static const struct target_desc *
761 s390_core_read_description (struct gdbarch *gdbarch,
762 struct target_ops *target, bfd *abfd)
764 asection *high_gprs = bfd_get_section_by_name (abfd, ".reg-s390-high-gprs");
765 asection *v1 = bfd_get_section_by_name (abfd, ".reg-s390-last-break");
766 asection *v2 = bfd_get_section_by_name (abfd, ".reg-s390-system-call");
767 asection *section = bfd_get_section_by_name (abfd, ".reg");
771 switch (bfd_section_size (abfd, section))
773 case s390_sizeof_gregset:
775 return (v2? tdesc_s390_linux64v2 :
776 v1? tdesc_s390_linux64v1 : tdesc_s390_linux64);
778 return (v2? tdesc_s390_linux32v2 :
779 v1? tdesc_s390_linux32v1 : tdesc_s390_linux32);
781 case s390x_sizeof_gregset:
782 return (v2? tdesc_s390x_linux64v2 :
783 v1? tdesc_s390x_linux64v1 : tdesc_s390x_linux64);
791 /* Decoding S/390 instructions. */
793 /* Named opcode values for the S/390 instructions we recognize. Some
794 instructions have their opcode split across two fields; those are the
795 op1_* and op2_* enums. */
798 op1_lhi = 0xa7, op2_lhi = 0x08,
799 op1_lghi = 0xa7, op2_lghi = 0x09,
800 op1_lgfi = 0xc0, op2_lgfi = 0x01,
804 op1_ly = 0xe3, op2_ly = 0x58,
805 op1_lg = 0xe3, op2_lg = 0x04,
807 op1_lmy = 0xeb, op2_lmy = 0x98,
808 op1_lmg = 0xeb, op2_lmg = 0x04,
810 op1_sty = 0xe3, op2_sty = 0x50,
811 op1_stg = 0xe3, op2_stg = 0x24,
814 op1_stmy = 0xeb, op2_stmy = 0x90,
815 op1_stmg = 0xeb, op2_stmg = 0x24,
816 op1_aghi = 0xa7, op2_aghi = 0x0b,
817 op1_ahi = 0xa7, op2_ahi = 0x0a,
818 op1_agfi = 0xc2, op2_agfi = 0x08,
819 op1_afi = 0xc2, op2_afi = 0x09,
820 op1_algfi= 0xc2, op2_algfi= 0x0a,
821 op1_alfi = 0xc2, op2_alfi = 0x0b,
825 op1_ay = 0xe3, op2_ay = 0x5a,
826 op1_ag = 0xe3, op2_ag = 0x08,
827 op1_slgfi= 0xc2, op2_slgfi= 0x04,
828 op1_slfi = 0xc2, op2_slfi = 0x05,
832 op1_sy = 0xe3, op2_sy = 0x5b,
833 op1_sg = 0xe3, op2_sg = 0x09,
837 op1_lay = 0xe3, op2_lay = 0x71,
838 op1_larl = 0xc0, op2_larl = 0x00,
846 op1_bctg = 0xe3, op2_bctg = 0x46,
848 op1_bxhg = 0xeb, op2_bxhg = 0x44,
850 op1_bxleg= 0xeb, op2_bxleg= 0x45,
851 op1_bras = 0xa7, op2_bras = 0x05,
852 op1_brasl= 0xc0, op2_brasl= 0x05,
853 op1_brc = 0xa7, op2_brc = 0x04,
854 op1_brcl = 0xc0, op2_brcl = 0x04,
855 op1_brct = 0xa7, op2_brct = 0x06,
856 op1_brctg= 0xa7, op2_brctg= 0x07,
858 op1_brxhg= 0xec, op2_brxhg= 0x44,
860 op1_brxlg= 0xec, op2_brxlg= 0x45,
864 /* Read a single instruction from address AT. */
866 #define S390_MAX_INSTR_SIZE 6
868 s390_readinstruction (bfd_byte instr[], CORE_ADDR at)
870 static int s390_instrlen[] = { 2, 4, 4, 6 };
873 if (target_read_memory (at, &instr[0], 2))
875 instrlen = s390_instrlen[instr[0] >> 6];
878 if (target_read_memory (at + 2, &instr[2], instrlen - 2))
885 /* The functions below are for recognizing and decoding S/390
886 instructions of various formats. Each of them checks whether INSN
887 is an instruction of the given format, with the specified opcodes.
888 If it is, it sets the remaining arguments to the values of the
889 instruction's fields, and returns a non-zero value; otherwise, it
892 These functions' arguments appear in the order they appear in the
893 instruction, not in the machine-language form. So, opcodes always
894 come first, even though they're sometimes scattered around the
895 instructions. And displacements appear before base and extension
896 registers, as they do in the assembly syntax, not at the end, as
897 they do in the machine language. */
899 is_ri (bfd_byte *insn, int op1, int op2, unsigned int *r1, int *i2)
901 if (insn[0] == op1 && (insn[1] & 0xf) == op2)
903 *r1 = (insn[1] >> 4) & 0xf;
904 /* i2 is a 16-bit signed quantity. */
905 *i2 = (((insn[2] << 8) | insn[3]) ^ 0x8000) - 0x8000;
914 is_ril (bfd_byte *insn, int op1, int op2,
915 unsigned int *r1, int *i2)
917 if (insn[0] == op1 && (insn[1] & 0xf) == op2)
919 *r1 = (insn[1] >> 4) & 0xf;
920 /* i2 is a signed quantity. If the host 'int' is 32 bits long,
921 no sign extension is necessary, but we don't want to assume
923 *i2 = (((insn[2] << 24)
926 | (insn[5])) ^ 0x80000000) - 0x80000000;
935 is_rr (bfd_byte *insn, int op, unsigned int *r1, unsigned int *r2)
939 *r1 = (insn[1] >> 4) & 0xf;
949 is_rre (bfd_byte *insn, int op, unsigned int *r1, unsigned int *r2)
951 if (((insn[0] << 8) | insn[1]) == op)
953 /* Yes, insn[3]. insn[2] is unused in RRE format. */
954 *r1 = (insn[3] >> 4) & 0xf;
964 is_rs (bfd_byte *insn, int op,
965 unsigned int *r1, unsigned int *r3, unsigned int *d2, unsigned int *b2)
969 *r1 = (insn[1] >> 4) & 0xf;
971 *b2 = (insn[2] >> 4) & 0xf;
972 *d2 = ((insn[2] & 0xf) << 8) | insn[3];
981 is_rsy (bfd_byte *insn, int op1, int op2,
982 unsigned int *r1, unsigned int *r3, unsigned int *d2, unsigned int *b2)
987 *r1 = (insn[1] >> 4) & 0xf;
989 *b2 = (insn[2] >> 4) & 0xf;
990 /* The 'long displacement' is a 20-bit signed integer. */
991 *d2 = ((((insn[2] & 0xf) << 8) | insn[3] | (insn[4] << 12))
992 ^ 0x80000) - 0x80000;
1001 is_rsi (bfd_byte *insn, int op,
1002 unsigned int *r1, unsigned int *r3, int *i2)
1006 *r1 = (insn[1] >> 4) & 0xf;
1007 *r3 = insn[1] & 0xf;
1008 /* i2 is a 16-bit signed quantity. */
1009 *i2 = (((insn[2] << 8) | insn[3]) ^ 0x8000) - 0x8000;
1018 is_rie (bfd_byte *insn, int op1, int op2,
1019 unsigned int *r1, unsigned int *r3, int *i2)
1024 *r1 = (insn[1] >> 4) & 0xf;
1025 *r3 = insn[1] & 0xf;
1026 /* i2 is a 16-bit signed quantity. */
1027 *i2 = (((insn[2] << 8) | insn[3]) ^ 0x8000) - 0x8000;
1036 is_rx (bfd_byte *insn, int op,
1037 unsigned int *r1, unsigned int *d2, unsigned int *x2, unsigned int *b2)
1041 *r1 = (insn[1] >> 4) & 0xf;
1042 *x2 = insn[1] & 0xf;
1043 *b2 = (insn[2] >> 4) & 0xf;
1044 *d2 = ((insn[2] & 0xf) << 8) | insn[3];
1053 is_rxy (bfd_byte *insn, int op1, int op2,
1054 unsigned int *r1, unsigned int *d2, unsigned int *x2, unsigned int *b2)
1059 *r1 = (insn[1] >> 4) & 0xf;
1060 *x2 = insn[1] & 0xf;
1061 *b2 = (insn[2] >> 4) & 0xf;
1062 /* The 'long displacement' is a 20-bit signed integer. */
1063 *d2 = ((((insn[2] & 0xf) << 8) | insn[3] | (insn[4] << 12))
1064 ^ 0x80000) - 0x80000;
1072 /* Prologue analysis. */
1074 #define S390_NUM_GPRS 16
1075 #define S390_NUM_FPRS 16
1077 struct s390_prologue_data {
1080 struct pv_area *stack;
1082 /* The size and byte-order of a GPR or FPR. */
1085 enum bfd_endian byte_order;
1087 /* The general-purpose registers. */
1088 pv_t gpr[S390_NUM_GPRS];
1090 /* The floating-point registers. */
1091 pv_t fpr[S390_NUM_FPRS];
1093 /* The offset relative to the CFA where the incoming GPR N was saved
1094 by the function prologue. 0 if not saved or unknown. */
1095 int gpr_slot[S390_NUM_GPRS];
1097 /* Likewise for FPRs. */
1098 int fpr_slot[S390_NUM_FPRS];
1100 /* Nonzero if the backchain was saved. This is assumed to be the
1101 case when the incoming SP is saved at the current SP location. */
1102 int back_chain_saved_p;
1105 /* Return the effective address for an X-style instruction, like:
1109 Here, X2 and B2 are registers, and D2 is a signed 20-bit
1110 constant; the effective address is the sum of all three. If either
1111 X2 or B2 are zero, then it doesn't contribute to the sum --- this
1112 means that r0 can't be used as either X2 or B2. */
1114 s390_addr (struct s390_prologue_data *data,
1115 int d2, unsigned int x2, unsigned int b2)
1119 result = pv_constant (d2);
1121 result = pv_add (result, data->gpr[x2]);
1123 result = pv_add (result, data->gpr[b2]);
1128 /* Do a SIZE-byte store of VALUE to D2(X2,B2). */
1130 s390_store (struct s390_prologue_data *data,
1131 int d2, unsigned int x2, unsigned int b2, CORE_ADDR size,
1134 pv_t addr = s390_addr (data, d2, x2, b2);
1137 /* Check whether we are storing the backchain. */
1138 offset = pv_subtract (data->gpr[S390_SP_REGNUM - S390_R0_REGNUM], addr);
1140 if (pv_is_constant (offset) && offset.k == 0)
1141 if (size == data->gpr_size
1142 && pv_is_register_k (value, S390_SP_REGNUM, 0))
1144 data->back_chain_saved_p = 1;
1149 /* Check whether we are storing a register into the stack. */
1150 if (!pv_area_store_would_trash (data->stack, addr))
1151 pv_area_store (data->stack, addr, size, value);
1154 /* Note: If this is some store we cannot identify, you might think we
1155 should forget our cached values, as any of those might have been hit.
1157 However, we make the assumption that the register save areas are only
1158 ever stored to once in any given function, and we do recognize these
1159 stores. Thus every store we cannot recognize does not hit our data. */
1162 /* Do a SIZE-byte load from D2(X2,B2). */
1164 s390_load (struct s390_prologue_data *data,
1165 int d2, unsigned int x2, unsigned int b2, CORE_ADDR size)
1168 pv_t addr = s390_addr (data, d2, x2, b2);
1171 /* If it's a load from an in-line constant pool, then we can
1172 simulate that, under the assumption that the code isn't
1173 going to change between the time the processor actually
1174 executed it creating the current frame, and the time when
1175 we're analyzing the code to unwind past that frame. */
1176 if (pv_is_constant (addr))
1178 struct target_section *secp;
1179 secp = target_section_by_addr (¤t_target, addr.k);
1181 && (bfd_get_section_flags (secp->bfd, secp->the_bfd_section)
1183 return pv_constant (read_memory_integer (addr.k, size,
1187 /* Check whether we are accessing one of our save slots. */
1188 return pv_area_fetch (data->stack, addr, size);
1191 /* Function for finding saved registers in a 'struct pv_area'; we pass
1192 this to pv_area_scan.
1194 If VALUE is a saved register, ADDR says it was saved at a constant
1195 offset from the frame base, and SIZE indicates that the whole
1196 register was saved, record its offset in the reg_offset table in
1197 PROLOGUE_UNTYPED. */
1199 s390_check_for_saved (void *data_untyped, pv_t addr,
1200 CORE_ADDR size, pv_t value)
1202 struct s390_prologue_data *data = data_untyped;
1205 if (!pv_is_register (addr, S390_SP_REGNUM))
1208 offset = 16 * data->gpr_size + 32 - addr.k;
1210 /* If we are storing the original value of a register, we want to
1211 record the CFA offset. If the same register is stored multiple
1212 times, the stack slot with the highest address counts. */
1214 for (i = 0; i < S390_NUM_GPRS; i++)
1215 if (size == data->gpr_size
1216 && pv_is_register_k (value, S390_R0_REGNUM + i, 0))
1217 if (data->gpr_slot[i] == 0
1218 || data->gpr_slot[i] > offset)
1220 data->gpr_slot[i] = offset;
1224 for (i = 0; i < S390_NUM_FPRS; i++)
1225 if (size == data->fpr_size
1226 && pv_is_register_k (value, S390_F0_REGNUM + i, 0))
1227 if (data->fpr_slot[i] == 0
1228 || data->fpr_slot[i] > offset)
1230 data->fpr_slot[i] = offset;
1235 /* Analyze the prologue of the function starting at START_PC,
1236 continuing at most until CURRENT_PC. Initialize DATA to
1237 hold all information we find out about the state of the registers
1238 and stack slots. Return the address of the instruction after
1239 the last one that changed the SP, FP, or back chain; or zero
1242 s390_analyze_prologue (struct gdbarch *gdbarch,
1244 CORE_ADDR current_pc,
1245 struct s390_prologue_data *data)
1247 int word_size = gdbarch_ptr_bit (gdbarch) / 8;
1249 /* Our return value:
1250 The address of the instruction after the last one that changed
1251 the SP, FP, or back chain; zero if we got an error trying to
1253 CORE_ADDR result = start_pc;
1255 /* The current PC for our abstract interpretation. */
1258 /* The address of the next instruction after that. */
1261 /* Set up everything's initial value. */
1265 data->stack = make_pv_area (S390_SP_REGNUM, gdbarch_addr_bit (gdbarch));
1267 /* For the purpose of prologue tracking, we consider the GPR size to
1268 be equal to the ABI word size, even if it is actually larger
1269 (i.e. when running a 32-bit binary under a 64-bit kernel). */
1270 data->gpr_size = word_size;
1272 data->byte_order = gdbarch_byte_order (gdbarch);
1274 for (i = 0; i < S390_NUM_GPRS; i++)
1275 data->gpr[i] = pv_register (S390_R0_REGNUM + i, 0);
1277 for (i = 0; i < S390_NUM_FPRS; i++)
1278 data->fpr[i] = pv_register (S390_F0_REGNUM + i, 0);
1280 for (i = 0; i < S390_NUM_GPRS; i++)
1281 data->gpr_slot[i] = 0;
1283 for (i = 0; i < S390_NUM_FPRS; i++)
1284 data->fpr_slot[i] = 0;
1286 data->back_chain_saved_p = 0;
1289 /* Start interpreting instructions, until we hit the frame's
1290 current PC or the first branch instruction. */
1291 for (pc = start_pc; pc > 0 && pc < current_pc; pc = next_pc)
1293 bfd_byte insn[S390_MAX_INSTR_SIZE];
1294 int insn_len = s390_readinstruction (insn, pc);
1296 bfd_byte dummy[S390_MAX_INSTR_SIZE] = { 0 };
1297 bfd_byte *insn32 = word_size == 4 ? insn : dummy;
1298 bfd_byte *insn64 = word_size == 8 ? insn : dummy;
1300 /* Fields for various kinds of instructions. */
1301 unsigned int b2, r1, r2, x2, r3;
1304 /* The values of SP and FP before this instruction,
1305 for detecting instructions that change them. */
1306 pv_t pre_insn_sp, pre_insn_fp;
1307 /* Likewise for the flag whether the back chain was saved. */
1308 int pre_insn_back_chain_saved_p;
1310 /* If we got an error trying to read the instruction, report it. */
1317 next_pc = pc + insn_len;
1319 pre_insn_sp = data->gpr[S390_SP_REGNUM - S390_R0_REGNUM];
1320 pre_insn_fp = data->gpr[S390_FRAME_REGNUM - S390_R0_REGNUM];
1321 pre_insn_back_chain_saved_p = data->back_chain_saved_p;
1324 /* LHI r1, i2 --- load halfword immediate. */
1325 /* LGHI r1, i2 --- load halfword immediate (64-bit version). */
1326 /* LGFI r1, i2 --- load fullword immediate. */
1327 if (is_ri (insn32, op1_lhi, op2_lhi, &r1, &i2)
1328 || is_ri (insn64, op1_lghi, op2_lghi, &r1, &i2)
1329 || is_ril (insn, op1_lgfi, op2_lgfi, &r1, &i2))
1330 data->gpr[r1] = pv_constant (i2);
1332 /* LR r1, r2 --- load from register. */
1333 /* LGR r1, r2 --- load from register (64-bit version). */
1334 else if (is_rr (insn32, op_lr, &r1, &r2)
1335 || is_rre (insn64, op_lgr, &r1, &r2))
1336 data->gpr[r1] = data->gpr[r2];
1338 /* L r1, d2(x2, b2) --- load. */
1339 /* LY r1, d2(x2, b2) --- load (long-displacement version). */
1340 /* LG r1, d2(x2, b2) --- load (64-bit version). */
1341 else if (is_rx (insn32, op_l, &r1, &d2, &x2, &b2)
1342 || is_rxy (insn32, op1_ly, op2_ly, &r1, &d2, &x2, &b2)
1343 || is_rxy (insn64, op1_lg, op2_lg, &r1, &d2, &x2, &b2))
1344 data->gpr[r1] = s390_load (data, d2, x2, b2, data->gpr_size);
1346 /* ST r1, d2(x2, b2) --- store. */
1347 /* STY r1, d2(x2, b2) --- store (long-displacement version). */
1348 /* STG r1, d2(x2, b2) --- store (64-bit version). */
1349 else if (is_rx (insn32, op_st, &r1, &d2, &x2, &b2)
1350 || is_rxy (insn32, op1_sty, op2_sty, &r1, &d2, &x2, &b2)
1351 || is_rxy (insn64, op1_stg, op2_stg, &r1, &d2, &x2, &b2))
1352 s390_store (data, d2, x2, b2, data->gpr_size, data->gpr[r1]);
1354 /* STD r1, d2(x2,b2) --- store floating-point register. */
1355 else if (is_rx (insn, op_std, &r1, &d2, &x2, &b2))
1356 s390_store (data, d2, x2, b2, data->fpr_size, data->fpr[r1]);
1358 /* STM r1, r3, d2(b2) --- store multiple. */
1359 /* STMY r1, r3, d2(b2) --- store multiple (long-displacement
1361 /* STMG r1, r3, d2(b2) --- store multiple (64-bit version). */
1362 else if (is_rs (insn32, op_stm, &r1, &r3, &d2, &b2)
1363 || is_rsy (insn32, op1_stmy, op2_stmy, &r1, &r3, &d2, &b2)
1364 || is_rsy (insn64, op1_stmg, op2_stmg, &r1, &r3, &d2, &b2))
1366 for (; r1 <= r3; r1++, d2 += data->gpr_size)
1367 s390_store (data, d2, 0, b2, data->gpr_size, data->gpr[r1]);
1370 /* AHI r1, i2 --- add halfword immediate. */
1371 /* AGHI r1, i2 --- add halfword immediate (64-bit version). */
1372 /* AFI r1, i2 --- add fullword immediate. */
1373 /* AGFI r1, i2 --- add fullword immediate (64-bit version). */
1374 else if (is_ri (insn32, op1_ahi, op2_ahi, &r1, &i2)
1375 || is_ri (insn64, op1_aghi, op2_aghi, &r1, &i2)
1376 || is_ril (insn32, op1_afi, op2_afi, &r1, &i2)
1377 || is_ril (insn64, op1_agfi, op2_agfi, &r1, &i2))
1378 data->gpr[r1] = pv_add_constant (data->gpr[r1], i2);
1380 /* ALFI r1, i2 --- add logical immediate. */
1381 /* ALGFI r1, i2 --- add logical immediate (64-bit version). */
1382 else if (is_ril (insn32, op1_alfi, op2_alfi, &r1, &i2)
1383 || is_ril (insn64, op1_algfi, op2_algfi, &r1, &i2))
1384 data->gpr[r1] = pv_add_constant (data->gpr[r1],
1385 (CORE_ADDR)i2 & 0xffffffff);
1387 /* AR r1, r2 -- add register. */
1388 /* AGR r1, r2 -- add register (64-bit version). */
1389 else if (is_rr (insn32, op_ar, &r1, &r2)
1390 || is_rre (insn64, op_agr, &r1, &r2))
1391 data->gpr[r1] = pv_add (data->gpr[r1], data->gpr[r2]);
1393 /* A r1, d2(x2, b2) -- add. */
1394 /* AY r1, d2(x2, b2) -- add (long-displacement version). */
1395 /* AG r1, d2(x2, b2) -- add (64-bit version). */
1396 else if (is_rx (insn32, op_a, &r1, &d2, &x2, &b2)
1397 || is_rxy (insn32, op1_ay, op2_ay, &r1, &d2, &x2, &b2)
1398 || is_rxy (insn64, op1_ag, op2_ag, &r1, &d2, &x2, &b2))
1399 data->gpr[r1] = pv_add (data->gpr[r1],
1400 s390_load (data, d2, x2, b2, data->gpr_size));
1402 /* SLFI r1, i2 --- subtract logical immediate. */
1403 /* SLGFI r1, i2 --- subtract logical immediate (64-bit version). */
1404 else if (is_ril (insn32, op1_slfi, op2_slfi, &r1, &i2)
1405 || is_ril (insn64, op1_slgfi, op2_slgfi, &r1, &i2))
1406 data->gpr[r1] = pv_add_constant (data->gpr[r1],
1407 -((CORE_ADDR)i2 & 0xffffffff));
1409 /* SR r1, r2 -- subtract register. */
1410 /* SGR r1, r2 -- subtract register (64-bit version). */
1411 else if (is_rr (insn32, op_sr, &r1, &r2)
1412 || is_rre (insn64, op_sgr, &r1, &r2))
1413 data->gpr[r1] = pv_subtract (data->gpr[r1], data->gpr[r2]);
1415 /* S r1, d2(x2, b2) -- subtract. */
1416 /* SY r1, d2(x2, b2) -- subtract (long-displacement version). */
1417 /* SG r1, d2(x2, b2) -- subtract (64-bit version). */
1418 else if (is_rx (insn32, op_s, &r1, &d2, &x2, &b2)
1419 || is_rxy (insn32, op1_sy, op2_sy, &r1, &d2, &x2, &b2)
1420 || is_rxy (insn64, op1_sg, op2_sg, &r1, &d2, &x2, &b2))
1421 data->gpr[r1] = pv_subtract (data->gpr[r1],
1422 s390_load (data, d2, x2, b2, data->gpr_size));
1424 /* LA r1, d2(x2, b2) --- load address. */
1425 /* LAY r1, d2(x2, b2) --- load address (long-displacement version). */
1426 else if (is_rx (insn, op_la, &r1, &d2, &x2, &b2)
1427 || is_rxy (insn, op1_lay, op2_lay, &r1, &d2, &x2, &b2))
1428 data->gpr[r1] = s390_addr (data, d2, x2, b2);
1430 /* LARL r1, i2 --- load address relative long. */
1431 else if (is_ril (insn, op1_larl, op2_larl, &r1, &i2))
1432 data->gpr[r1] = pv_constant (pc + i2 * 2);
1434 /* BASR r1, 0 --- branch and save.
1435 Since r2 is zero, this saves the PC in r1, but doesn't branch. */
1436 else if (is_rr (insn, op_basr, &r1, &r2)
1438 data->gpr[r1] = pv_constant (next_pc);
1440 /* BRAS r1, i2 --- branch relative and save. */
1441 else if (is_ri (insn, op1_bras, op2_bras, &r1, &i2))
1443 data->gpr[r1] = pv_constant (next_pc);
1444 next_pc = pc + i2 * 2;
1446 /* We'd better not interpret any backward branches. We'll
1452 /* Terminate search when hitting any other branch instruction. */
1453 else if (is_rr (insn, op_basr, &r1, &r2)
1454 || is_rx (insn, op_bas, &r1, &d2, &x2, &b2)
1455 || is_rr (insn, op_bcr, &r1, &r2)
1456 || is_rx (insn, op_bc, &r1, &d2, &x2, &b2)
1457 || is_ri (insn, op1_brc, op2_brc, &r1, &i2)
1458 || is_ril (insn, op1_brcl, op2_brcl, &r1, &i2)
1459 || is_ril (insn, op1_brasl, op2_brasl, &r2, &i2))
1463 /* An instruction we don't know how to simulate. The only
1464 safe thing to do would be to set every value we're tracking
1465 to 'unknown'. Instead, we'll be optimistic: we assume that
1466 we *can* interpret every instruction that the compiler uses
1467 to manipulate any of the data we're interested in here --
1468 then we can just ignore anything else. */
1471 /* Record the address after the last instruction that changed
1472 the FP, SP, or backlink. Ignore instructions that changed
1473 them back to their original values --- those are probably
1474 restore instructions. (The back chain is never restored,
1477 pv_t sp = data->gpr[S390_SP_REGNUM - S390_R0_REGNUM];
1478 pv_t fp = data->gpr[S390_FRAME_REGNUM - S390_R0_REGNUM];
1480 if ((! pv_is_identical (pre_insn_sp, sp)
1481 && ! pv_is_register_k (sp, S390_SP_REGNUM, 0)
1482 && sp.kind != pvk_unknown)
1483 || (! pv_is_identical (pre_insn_fp, fp)
1484 && ! pv_is_register_k (fp, S390_FRAME_REGNUM, 0)
1485 && fp.kind != pvk_unknown)
1486 || pre_insn_back_chain_saved_p != data->back_chain_saved_p)
1491 /* Record where all the registers were saved. */
1492 pv_area_scan (data->stack, s390_check_for_saved, data);
1494 free_pv_area (data->stack);
1500 /* Advance PC across any function entry prologue instructions to reach
1501 some "real" code. */
1503 s390_skip_prologue (struct gdbarch *gdbarch, CORE_ADDR pc)
1505 struct s390_prologue_data data;
1507 skip_pc = s390_analyze_prologue (gdbarch, pc, (CORE_ADDR)-1, &data);
1508 return skip_pc ? skip_pc : pc;
1511 /* Return true if we are in the functin's epilogue, i.e. after the
1512 instruction that destroyed the function's stack frame. */
1514 s390_in_function_epilogue_p (struct gdbarch *gdbarch, CORE_ADDR pc)
1516 int word_size = gdbarch_ptr_bit (gdbarch) / 8;
1518 /* In frameless functions, there's not frame to destroy and thus
1519 we don't care about the epilogue.
1521 In functions with frame, the epilogue sequence is a pair of
1522 a LM-type instruction that restores (amongst others) the
1523 return register %r14 and the stack pointer %r15, followed
1524 by a branch 'br %r14' --or equivalent-- that effects the
1527 In that situation, this function needs to return 'true' in
1528 exactly one case: when pc points to that branch instruction.
1530 Thus we try to disassemble the one instructions immediately
1531 preceding pc and check whether it is an LM-type instruction
1532 modifying the stack pointer.
1534 Note that disassembling backwards is not reliable, so there
1535 is a slight chance of false positives here ... */
1538 unsigned int r1, r3, b2;
1542 && !target_read_memory (pc - 4, insn, 4)
1543 && is_rs (insn, op_lm, &r1, &r3, &d2, &b2)
1544 && r3 == S390_SP_REGNUM - S390_R0_REGNUM)
1548 && !target_read_memory (pc - 6, insn, 6)
1549 && is_rsy (insn, op1_lmy, op2_lmy, &r1, &r3, &d2, &b2)
1550 && r3 == S390_SP_REGNUM - S390_R0_REGNUM)
1554 && !target_read_memory (pc - 6, insn, 6)
1555 && is_rsy (insn, op1_lmg, op2_lmg, &r1, &r3, &d2, &b2)
1556 && r3 == S390_SP_REGNUM - S390_R0_REGNUM)
1562 /* Displaced stepping. */
1564 /* Fix up the state of registers and memory after having single-stepped
1565 a displaced instruction. */
1567 s390_displaced_step_fixup (struct gdbarch *gdbarch,
1568 struct displaced_step_closure *closure,
1569 CORE_ADDR from, CORE_ADDR to,
1570 struct regcache *regs)
1572 /* Since we use simple_displaced_step_copy_insn, our closure is a
1573 copy of the instruction. */
1574 gdb_byte *insn = (gdb_byte *) closure;
1575 static int s390_instrlen[] = { 2, 4, 4, 6 };
1576 int insnlen = s390_instrlen[insn[0] >> 6];
1578 /* Fields for various kinds of instructions. */
1579 unsigned int b2, r1, r2, x2, r3;
1582 /* Get current PC and addressing mode bit. */
1583 CORE_ADDR pc = regcache_read_pc (regs);
1586 if (register_size (gdbarch, S390_PSWA_REGNUM) == 4)
1588 regcache_cooked_read_unsigned (regs, S390_PSWA_REGNUM, &amode);
1589 amode &= 0x80000000;
1592 if (debug_displaced)
1593 fprintf_unfiltered (gdb_stdlog,
1594 "displaced: (s390) fixup (%s, %s) pc %s len %d amode 0x%x\n",
1595 paddress (gdbarch, from), paddress (gdbarch, to),
1596 paddress (gdbarch, pc), insnlen, (int) amode);
1598 /* Handle absolute branch and save instructions. */
1599 if (is_rr (insn, op_basr, &r1, &r2)
1600 || is_rx (insn, op_bas, &r1, &d2, &x2, &b2))
1602 /* Recompute saved return address in R1. */
1603 regcache_cooked_write_unsigned (regs, S390_R0_REGNUM + r1,
1604 amode | (from + insnlen));
1607 /* Handle absolute branch instructions. */
1608 else if (is_rr (insn, op_bcr, &r1, &r2)
1609 || is_rx (insn, op_bc, &r1, &d2, &x2, &b2)
1610 || is_rr (insn, op_bctr, &r1, &r2)
1611 || is_rre (insn, op_bctgr, &r1, &r2)
1612 || is_rx (insn, op_bct, &r1, &d2, &x2, &b2)
1613 || is_rxy (insn, op1_bctg, op2_brctg, &r1, &d2, &x2, &b2)
1614 || is_rs (insn, op_bxh, &r1, &r3, &d2, &b2)
1615 || is_rsy (insn, op1_bxhg, op2_bxhg, &r1, &r3, &d2, &b2)
1616 || is_rs (insn, op_bxle, &r1, &r3, &d2, &b2)
1617 || is_rsy (insn, op1_bxleg, op2_bxleg, &r1, &r3, &d2, &b2))
1619 /* Update PC iff branch was *not* taken. */
1620 if (pc == to + insnlen)
1621 regcache_write_pc (regs, from + insnlen);
1624 /* Handle PC-relative branch and save instructions. */
1625 else if (is_ri (insn, op1_bras, op2_bras, &r1, &i2)
1626 || is_ril (insn, op1_brasl, op2_brasl, &r1, &i2))
1629 regcache_write_pc (regs, pc - to + from);
1630 /* Recompute saved return address in R1. */
1631 regcache_cooked_write_unsigned (regs, S390_R0_REGNUM + r1,
1632 amode | (from + insnlen));
1635 /* Handle PC-relative branch instructions. */
1636 else if (is_ri (insn, op1_brc, op2_brc, &r1, &i2)
1637 || is_ril (insn, op1_brcl, op2_brcl, &r1, &i2)
1638 || is_ri (insn, op1_brct, op2_brct, &r1, &i2)
1639 || is_ri (insn, op1_brctg, op2_brctg, &r1, &i2)
1640 || is_rsi (insn, op_brxh, &r1, &r3, &i2)
1641 || is_rie (insn, op1_brxhg, op2_brxhg, &r1, &r3, &i2)
1642 || is_rsi (insn, op_brxle, &r1, &r3, &i2)
1643 || is_rie (insn, op1_brxlg, op2_brxlg, &r1, &r3, &i2))
1646 regcache_write_pc (regs, pc - to + from);
1649 /* Handle LOAD ADDRESS RELATIVE LONG. */
1650 else if (is_ril (insn, op1_larl, op2_larl, &r1, &i2))
1653 regcache_write_pc (regs, from + insnlen);
1654 /* Recompute output address in R1. */
1655 regcache_cooked_write_unsigned (regs, S390_R0_REGNUM + r1,
1656 amode | (from + i2 * 2));
1659 /* If we executed a breakpoint instruction, point PC right back at it. */
1660 else if (insn[0] == 0x0 && insn[1] == 0x1)
1661 regcache_write_pc (regs, from);
1663 /* For any other insn, PC points right after the original instruction. */
1665 regcache_write_pc (regs, from + insnlen);
1667 if (debug_displaced)
1668 fprintf_unfiltered (gdb_stdlog,
1669 "displaced: (s390) pc is now %s\n",
1670 paddress (gdbarch, regcache_read_pc (regs)));
1674 /* Helper routine to unwind pseudo registers. */
1676 static struct value *
1677 s390_unwind_pseudo_register (struct frame_info *this_frame, int regnum)
1679 struct gdbarch *gdbarch = get_frame_arch (this_frame);
1680 struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
1681 struct type *type = register_type (gdbarch, regnum);
1683 /* Unwind PC via PSW address. */
1684 if (regnum == tdep->pc_regnum)
1688 val = frame_unwind_register_value (this_frame, S390_PSWA_REGNUM);
1689 if (!value_optimized_out (val))
1691 LONGEST pswa = value_as_long (val);
1693 if (TYPE_LENGTH (type) == 4)
1694 return value_from_pointer (type, pswa & 0x7fffffff);
1696 return value_from_pointer (type, pswa);
1700 /* Unwind CC via PSW mask. */
1701 if (regnum == tdep->cc_regnum)
1705 val = frame_unwind_register_value (this_frame, S390_PSWM_REGNUM);
1706 if (!value_optimized_out (val))
1708 LONGEST pswm = value_as_long (val);
1710 if (TYPE_LENGTH (type) == 4)
1711 return value_from_longest (type, (pswm >> 12) & 3);
1713 return value_from_longest (type, (pswm >> 44) & 3);
1717 /* Unwind full GPRs to show at least the lower halves (as the
1718 upper halves are undefined). */
1719 if (tdep->gpr_full_regnum != -1
1720 && regnum >= tdep->gpr_full_regnum
1721 && regnum < tdep->gpr_full_regnum + 16)
1723 int reg = regnum - tdep->gpr_full_regnum;
1726 val = frame_unwind_register_value (this_frame, S390_R0_REGNUM + reg);
1727 if (!value_optimized_out (val))
1728 return value_cast (type, val);
1731 return allocate_optimized_out_value (type);
1734 static struct value *
1735 s390_trad_frame_prev_register (struct frame_info *this_frame,
1736 struct trad_frame_saved_reg saved_regs[],
1739 if (regnum < S390_NUM_REGS)
1740 return trad_frame_get_prev_register (this_frame, saved_regs, regnum);
1742 return s390_unwind_pseudo_register (this_frame, regnum);
1746 /* Normal stack frames. */
1748 struct s390_unwind_cache {
1751 CORE_ADDR frame_base;
1752 CORE_ADDR local_base;
1754 struct trad_frame_saved_reg *saved_regs;
1758 s390_prologue_frame_unwind_cache (struct frame_info *this_frame,
1759 struct s390_unwind_cache *info)
1761 struct gdbarch *gdbarch = get_frame_arch (this_frame);
1762 int word_size = gdbarch_ptr_bit (gdbarch) / 8;
1763 struct s390_prologue_data data;
1764 pv_t *fp = &data.gpr[S390_FRAME_REGNUM - S390_R0_REGNUM];
1765 pv_t *sp = &data.gpr[S390_SP_REGNUM - S390_R0_REGNUM];
1774 struct frame_info *next_frame;
1776 /* Try to find the function start address. If we can't find it, we don't
1777 bother searching for it -- with modern compilers this would be mostly
1778 pointless anyway. Trust that we'll either have valid DWARF-2 CFI data
1779 or else a valid backchain ... */
1780 func = get_frame_func (this_frame);
1784 /* Try to analyze the prologue. */
1785 result = s390_analyze_prologue (gdbarch, func,
1786 get_frame_pc (this_frame), &data);
1790 /* If this was successful, we should have found the instruction that
1791 sets the stack pointer register to the previous value of the stack
1792 pointer minus the frame size. */
1793 if (!pv_is_register (*sp, S390_SP_REGNUM))
1796 /* A frame size of zero at this point can mean either a real
1797 frameless function, or else a failure to find the prologue.
1798 Perform some sanity checks to verify we really have a
1799 frameless function. */
1802 /* If the next frame is a NORMAL_FRAME, this frame *cannot* have frame
1803 size zero. This is only possible if the next frame is a sentinel
1804 frame, a dummy frame, or a signal trampoline frame. */
1805 /* FIXME: cagney/2004-05-01: This sanity check shouldn't be
1806 needed, instead the code should simpliy rely on its
1808 next_frame = get_next_frame (this_frame);
1809 while (next_frame && get_frame_type (next_frame) == INLINE_FRAME)
1810 next_frame = get_next_frame (next_frame);
1812 && get_frame_type (get_next_frame (this_frame)) == NORMAL_FRAME)
1815 /* If we really have a frameless function, %r14 must be valid
1816 -- in particular, it must point to a different function. */
1817 reg = get_frame_register_unsigned (this_frame, S390_RETADDR_REGNUM);
1818 reg = gdbarch_addr_bits_remove (gdbarch, reg) - 1;
1819 if (get_pc_function_start (reg) == func)
1821 /* However, there is one case where it *is* valid for %r14
1822 to point to the same function -- if this is a recursive
1823 call, and we have stopped in the prologue *before* the
1824 stack frame was allocated.
1826 Recognize this case by looking ahead a bit ... */
1828 struct s390_prologue_data data2;
1829 pv_t *sp = &data2.gpr[S390_SP_REGNUM - S390_R0_REGNUM];
1831 if (!(s390_analyze_prologue (gdbarch, func, (CORE_ADDR)-1, &data2)
1832 && pv_is_register (*sp, S390_SP_REGNUM)
1839 /* OK, we've found valid prologue data. */
1842 /* If the frame pointer originally also holds the same value
1843 as the stack pointer, we're probably using it. If it holds
1844 some other value -- even a constant offset -- it is most
1845 likely used as temp register. */
1846 if (pv_is_identical (*sp, *fp))
1847 frame_pointer = S390_FRAME_REGNUM;
1849 frame_pointer = S390_SP_REGNUM;
1851 /* If we've detected a function with stack frame, we'll still have to
1852 treat it as frameless if we're currently within the function epilog
1853 code at a point where the frame pointer has already been restored.
1854 This can only happen in an innermost frame. */
1855 /* FIXME: cagney/2004-05-01: This sanity check shouldn't be needed,
1856 instead the code should simpliy rely on its analysis. */
1857 next_frame = get_next_frame (this_frame);
1858 while (next_frame && get_frame_type (next_frame) == INLINE_FRAME)
1859 next_frame = get_next_frame (next_frame);
1861 && (next_frame == NULL
1862 || get_frame_type (get_next_frame (this_frame)) != NORMAL_FRAME))
1864 /* See the comment in s390_in_function_epilogue_p on why this is
1865 not completely reliable ... */
1866 if (s390_in_function_epilogue_p (gdbarch, get_frame_pc (this_frame)))
1868 memset (&data, 0, sizeof (data));
1870 frame_pointer = S390_SP_REGNUM;
1874 /* Once we know the frame register and the frame size, we can unwind
1875 the current value of the frame register from the next frame, and
1876 add back the frame size to arrive that the previous frame's
1877 stack pointer value. */
1878 prev_sp = get_frame_register_unsigned (this_frame, frame_pointer) + size;
1879 cfa = prev_sp + 16*word_size + 32;
1881 /* Set up ABI call-saved/call-clobbered registers. */
1882 for (i = 0; i < S390_NUM_REGS; i++)
1883 if (!s390_register_call_saved (gdbarch, i))
1884 trad_frame_set_unknown (info->saved_regs, i);
1886 /* CC is always call-clobbered. */
1887 trad_frame_set_unknown (info->saved_regs, S390_PSWM_REGNUM);
1889 /* Record the addresses of all register spill slots the prologue parser
1890 has recognized. Consider only registers defined as call-saved by the
1891 ABI; for call-clobbered registers the parser may have recognized
1894 for (i = 0; i < 16; i++)
1895 if (s390_register_call_saved (gdbarch, S390_R0_REGNUM + i)
1896 && data.gpr_slot[i] != 0)
1897 info->saved_regs[S390_R0_REGNUM + i].addr = cfa - data.gpr_slot[i];
1899 for (i = 0; i < 16; i++)
1900 if (s390_register_call_saved (gdbarch, S390_F0_REGNUM + i)
1901 && data.fpr_slot[i] != 0)
1902 info->saved_regs[S390_F0_REGNUM + i].addr = cfa - data.fpr_slot[i];
1904 /* Function return will set PC to %r14. */
1905 info->saved_regs[S390_PSWA_REGNUM] = info->saved_regs[S390_RETADDR_REGNUM];
1907 /* In frameless functions, we unwind simply by moving the return
1908 address to the PC. However, if we actually stored to the
1909 save area, use that -- we might only think the function frameless
1910 because we're in the middle of the prologue ... */
1912 && !trad_frame_addr_p (info->saved_regs, S390_PSWA_REGNUM))
1914 info->saved_regs[S390_PSWA_REGNUM].realreg = S390_RETADDR_REGNUM;
1917 /* Another sanity check: unless this is a frameless function,
1918 we should have found spill slots for SP and PC.
1919 If not, we cannot unwind further -- this happens e.g. in
1920 libc's thread_start routine. */
1923 if (!trad_frame_addr_p (info->saved_regs, S390_SP_REGNUM)
1924 || !trad_frame_addr_p (info->saved_regs, S390_PSWA_REGNUM))
1928 /* We use the current value of the frame register as local_base,
1929 and the top of the register save area as frame_base. */
1932 info->frame_base = prev_sp + 16*word_size + 32;
1933 info->local_base = prev_sp - size;
1941 s390_backchain_frame_unwind_cache (struct frame_info *this_frame,
1942 struct s390_unwind_cache *info)
1944 struct gdbarch *gdbarch = get_frame_arch (this_frame);
1945 int word_size = gdbarch_ptr_bit (gdbarch) / 8;
1946 enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
1947 CORE_ADDR backchain;
1952 /* Set up ABI call-saved/call-clobbered registers. */
1953 for (i = 0; i < S390_NUM_REGS; i++)
1954 if (!s390_register_call_saved (gdbarch, i))
1955 trad_frame_set_unknown (info->saved_regs, i);
1957 /* CC is always call-clobbered. */
1958 trad_frame_set_unknown (info->saved_regs, S390_PSWM_REGNUM);
1960 /* Get the backchain. */
1961 reg = get_frame_register_unsigned (this_frame, S390_SP_REGNUM);
1962 backchain = read_memory_unsigned_integer (reg, word_size, byte_order);
1964 /* A zero backchain terminates the frame chain. As additional
1965 sanity check, let's verify that the spill slot for SP in the
1966 save area pointed to by the backchain in fact links back to
1969 && safe_read_memory_integer (backchain + 15*word_size,
1970 word_size, byte_order, &sp)
1971 && (CORE_ADDR)sp == backchain)
1973 /* We don't know which registers were saved, but it will have
1974 to be at least %r14 and %r15. This will allow us to continue
1975 unwinding, but other prev-frame registers may be incorrect ... */
1976 info->saved_regs[S390_SP_REGNUM].addr = backchain + 15*word_size;
1977 info->saved_regs[S390_RETADDR_REGNUM].addr = backchain + 14*word_size;
1979 /* Function return will set PC to %r14. */
1980 info->saved_regs[S390_PSWA_REGNUM]
1981 = info->saved_regs[S390_RETADDR_REGNUM];
1983 /* We use the current value of the frame register as local_base,
1984 and the top of the register save area as frame_base. */
1985 info->frame_base = backchain + 16*word_size + 32;
1986 info->local_base = reg;
1989 info->func = get_frame_pc (this_frame);
1992 static struct s390_unwind_cache *
1993 s390_frame_unwind_cache (struct frame_info *this_frame,
1994 void **this_prologue_cache)
1996 struct s390_unwind_cache *info;
1997 if (*this_prologue_cache)
1998 return *this_prologue_cache;
2000 info = FRAME_OBSTACK_ZALLOC (struct s390_unwind_cache);
2001 *this_prologue_cache = info;
2002 info->saved_regs = trad_frame_alloc_saved_regs (this_frame);
2004 info->frame_base = -1;
2005 info->local_base = -1;
2007 /* Try to use prologue analysis to fill the unwind cache.
2008 If this fails, fall back to reading the stack backchain. */
2009 if (!s390_prologue_frame_unwind_cache (this_frame, info))
2010 s390_backchain_frame_unwind_cache (this_frame, info);
2016 s390_frame_this_id (struct frame_info *this_frame,
2017 void **this_prologue_cache,
2018 struct frame_id *this_id)
2020 struct s390_unwind_cache *info
2021 = s390_frame_unwind_cache (this_frame, this_prologue_cache);
2023 if (info->frame_base == -1)
2026 *this_id = frame_id_build (info->frame_base, info->func);
2029 static struct value *
2030 s390_frame_prev_register (struct frame_info *this_frame,
2031 void **this_prologue_cache, int regnum)
2033 struct gdbarch *gdbarch = get_frame_arch (this_frame);
2034 struct s390_unwind_cache *info
2035 = s390_frame_unwind_cache (this_frame, this_prologue_cache);
2037 return s390_trad_frame_prev_register (this_frame, info->saved_regs, regnum);
2040 static const struct frame_unwind s390_frame_unwind = {
2042 default_frame_unwind_stop_reason,
2044 s390_frame_prev_register,
2046 default_frame_sniffer
2050 /* Code stubs and their stack frames. For things like PLTs and NULL
2051 function calls (where there is no true frame and the return address
2052 is in the RETADDR register). */
2054 struct s390_stub_unwind_cache
2056 CORE_ADDR frame_base;
2057 struct trad_frame_saved_reg *saved_regs;
2060 static struct s390_stub_unwind_cache *
2061 s390_stub_frame_unwind_cache (struct frame_info *this_frame,
2062 void **this_prologue_cache)
2064 struct gdbarch *gdbarch = get_frame_arch (this_frame);
2065 int word_size = gdbarch_ptr_bit (gdbarch) / 8;
2066 struct s390_stub_unwind_cache *info;
2069 if (*this_prologue_cache)
2070 return *this_prologue_cache;
2072 info = FRAME_OBSTACK_ZALLOC (struct s390_stub_unwind_cache);
2073 *this_prologue_cache = info;
2074 info->saved_regs = trad_frame_alloc_saved_regs (this_frame);
2076 /* The return address is in register %r14. */
2077 info->saved_regs[S390_PSWA_REGNUM].realreg = S390_RETADDR_REGNUM;
2079 /* Retrieve stack pointer and determine our frame base. */
2080 reg = get_frame_register_unsigned (this_frame, S390_SP_REGNUM);
2081 info->frame_base = reg + 16*word_size + 32;
2087 s390_stub_frame_this_id (struct frame_info *this_frame,
2088 void **this_prologue_cache,
2089 struct frame_id *this_id)
2091 struct s390_stub_unwind_cache *info
2092 = s390_stub_frame_unwind_cache (this_frame, this_prologue_cache);
2093 *this_id = frame_id_build (info->frame_base, get_frame_pc (this_frame));
2096 static struct value *
2097 s390_stub_frame_prev_register (struct frame_info *this_frame,
2098 void **this_prologue_cache, int regnum)
2100 struct s390_stub_unwind_cache *info
2101 = s390_stub_frame_unwind_cache (this_frame, this_prologue_cache);
2102 return s390_trad_frame_prev_register (this_frame, info->saved_regs, regnum);
2106 s390_stub_frame_sniffer (const struct frame_unwind *self,
2107 struct frame_info *this_frame,
2108 void **this_prologue_cache)
2110 CORE_ADDR addr_in_block;
2111 bfd_byte insn[S390_MAX_INSTR_SIZE];
2113 /* If the current PC points to non-readable memory, we assume we
2114 have trapped due to an invalid function pointer call. We handle
2115 the non-existing current function like a PLT stub. */
2116 addr_in_block = get_frame_address_in_block (this_frame);
2117 if (in_plt_section (addr_in_block, NULL)
2118 || s390_readinstruction (insn, get_frame_pc (this_frame)) < 0)
2123 static const struct frame_unwind s390_stub_frame_unwind = {
2125 default_frame_unwind_stop_reason,
2126 s390_stub_frame_this_id,
2127 s390_stub_frame_prev_register,
2129 s390_stub_frame_sniffer
2133 /* Signal trampoline stack frames. */
2135 struct s390_sigtramp_unwind_cache {
2136 CORE_ADDR frame_base;
2137 struct trad_frame_saved_reg *saved_regs;
2140 static struct s390_sigtramp_unwind_cache *
2141 s390_sigtramp_frame_unwind_cache (struct frame_info *this_frame,
2142 void **this_prologue_cache)
2144 struct gdbarch *gdbarch = get_frame_arch (this_frame);
2145 struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
2146 int word_size = gdbarch_ptr_bit (gdbarch) / 8;
2147 enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
2148 struct s390_sigtramp_unwind_cache *info;
2149 ULONGEST this_sp, prev_sp;
2150 CORE_ADDR next_ra, next_cfa, sigreg_ptr, sigreg_high_off;
2153 if (*this_prologue_cache)
2154 return *this_prologue_cache;
2156 info = FRAME_OBSTACK_ZALLOC (struct s390_sigtramp_unwind_cache);
2157 *this_prologue_cache = info;
2158 info->saved_regs = trad_frame_alloc_saved_regs (this_frame);
2160 this_sp = get_frame_register_unsigned (this_frame, S390_SP_REGNUM);
2161 next_ra = get_frame_pc (this_frame);
2162 next_cfa = this_sp + 16*word_size + 32;
2164 /* New-style RT frame:
2165 retcode + alignment (8 bytes)
2167 ucontext (contains sigregs at offset 5 words). */
2168 if (next_ra == next_cfa)
2170 sigreg_ptr = next_cfa + 8 + 128 + align_up (5*word_size, 8);
2171 /* sigregs are followed by uc_sigmask (8 bytes), then by the
2172 upper GPR halves if present. */
2173 sigreg_high_off = 8;
2176 /* Old-style RT frame and all non-RT frames:
2177 old signal mask (8 bytes)
2178 pointer to sigregs. */
2181 sigreg_ptr = read_memory_unsigned_integer (next_cfa + 8,
2182 word_size, byte_order);
2183 /* sigregs are followed by signo (4 bytes), then by the
2184 upper GPR halves if present. */
2185 sigreg_high_off = 4;
2188 /* The sigregs structure looks like this:
2197 /* PSW mask and address. */
2198 info->saved_regs[S390_PSWM_REGNUM].addr = sigreg_ptr;
2199 sigreg_ptr += word_size;
2200 info->saved_regs[S390_PSWA_REGNUM].addr = sigreg_ptr;
2201 sigreg_ptr += word_size;
2203 /* Then the GPRs. */
2204 for (i = 0; i < 16; i++)
2206 info->saved_regs[S390_R0_REGNUM + i].addr = sigreg_ptr;
2207 sigreg_ptr += word_size;
2210 /* Then the ACRs. */
2211 for (i = 0; i < 16; i++)
2213 info->saved_regs[S390_A0_REGNUM + i].addr = sigreg_ptr;
2217 /* The floating-point control word. */
2218 info->saved_regs[S390_FPC_REGNUM].addr = sigreg_ptr;
2221 /* And finally the FPRs. */
2222 for (i = 0; i < 16; i++)
2224 info->saved_regs[S390_F0_REGNUM + i].addr = sigreg_ptr;
2228 /* If we have them, the GPR upper halves are appended at the end. */
2229 sigreg_ptr += sigreg_high_off;
2230 if (tdep->gpr_full_regnum != -1)
2231 for (i = 0; i < 16; i++)
2233 info->saved_regs[S390_R0_UPPER_REGNUM + i].addr = sigreg_ptr;
2237 /* Restore the previous frame's SP. */
2238 prev_sp = read_memory_unsigned_integer (
2239 info->saved_regs[S390_SP_REGNUM].addr,
2240 word_size, byte_order);
2242 /* Determine our frame base. */
2243 info->frame_base = prev_sp + 16*word_size + 32;
2249 s390_sigtramp_frame_this_id (struct frame_info *this_frame,
2250 void **this_prologue_cache,
2251 struct frame_id *this_id)
2253 struct s390_sigtramp_unwind_cache *info
2254 = s390_sigtramp_frame_unwind_cache (this_frame, this_prologue_cache);
2255 *this_id = frame_id_build (info->frame_base, get_frame_pc (this_frame));
2258 static struct value *
2259 s390_sigtramp_frame_prev_register (struct frame_info *this_frame,
2260 void **this_prologue_cache, int regnum)
2262 struct s390_sigtramp_unwind_cache *info
2263 = s390_sigtramp_frame_unwind_cache (this_frame, this_prologue_cache);
2264 return s390_trad_frame_prev_register (this_frame, info->saved_regs, regnum);
2268 s390_sigtramp_frame_sniffer (const struct frame_unwind *self,
2269 struct frame_info *this_frame,
2270 void **this_prologue_cache)
2272 CORE_ADDR pc = get_frame_pc (this_frame);
2273 bfd_byte sigreturn[2];
2275 if (target_read_memory (pc, sigreturn, 2))
2278 if (sigreturn[0] != 0x0a /* svc */)
2281 if (sigreturn[1] != 119 /* sigreturn */
2282 && sigreturn[1] != 173 /* rt_sigreturn */)
2288 static const struct frame_unwind s390_sigtramp_frame_unwind = {
2290 default_frame_unwind_stop_reason,
2291 s390_sigtramp_frame_this_id,
2292 s390_sigtramp_frame_prev_register,
2294 s390_sigtramp_frame_sniffer
2298 /* Frame base handling. */
2301 s390_frame_base_address (struct frame_info *this_frame, void **this_cache)
2303 struct s390_unwind_cache *info
2304 = s390_frame_unwind_cache (this_frame, this_cache);
2305 return info->frame_base;
2309 s390_local_base_address (struct frame_info *this_frame, void **this_cache)
2311 struct s390_unwind_cache *info
2312 = s390_frame_unwind_cache (this_frame, this_cache);
2313 return info->local_base;
2316 static const struct frame_base s390_frame_base = {
2318 s390_frame_base_address,
2319 s390_local_base_address,
2320 s390_local_base_address
2324 s390_unwind_pc (struct gdbarch *gdbarch, struct frame_info *next_frame)
2326 struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
2328 pc = frame_unwind_register_unsigned (next_frame, tdep->pc_regnum);
2329 return gdbarch_addr_bits_remove (gdbarch, pc);
2333 s390_unwind_sp (struct gdbarch *gdbarch, struct frame_info *next_frame)
2336 sp = frame_unwind_register_unsigned (next_frame, S390_SP_REGNUM);
2337 return gdbarch_addr_bits_remove (gdbarch, sp);
2341 /* DWARF-2 frame support. */
2343 static struct value *
2344 s390_dwarf2_prev_register (struct frame_info *this_frame, void **this_cache,
2347 return s390_unwind_pseudo_register (this_frame, regnum);
2351 s390_dwarf2_frame_init_reg (struct gdbarch *gdbarch, int regnum,
2352 struct dwarf2_frame_state_reg *reg,
2353 struct frame_info *this_frame)
2355 struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
2357 /* The condition code (and thus PSW mask) is call-clobbered. */
2358 if (regnum == S390_PSWM_REGNUM)
2359 reg->how = DWARF2_FRAME_REG_UNDEFINED;
2361 /* The PSW address unwinds to the return address. */
2362 else if (regnum == S390_PSWA_REGNUM)
2363 reg->how = DWARF2_FRAME_REG_RA;
2365 /* Fixed registers are call-saved or call-clobbered
2366 depending on the ABI in use. */
2367 else if (regnum < S390_NUM_REGS)
2369 if (s390_register_call_saved (gdbarch, regnum))
2370 reg->how = DWARF2_FRAME_REG_SAME_VALUE;
2372 reg->how = DWARF2_FRAME_REG_UNDEFINED;
2375 /* We install a special function to unwind pseudos. */
2378 reg->how = DWARF2_FRAME_REG_FN;
2379 reg->loc.fn = s390_dwarf2_prev_register;
2384 /* Dummy function calls. */
2386 /* Return non-zero if TYPE is an integer-like type, zero otherwise.
2387 "Integer-like" types are those that should be passed the way
2388 integers are: integers, enums, ranges, characters, and booleans. */
2390 is_integer_like (struct type *type)
2392 enum type_code code = TYPE_CODE (type);
2394 return (code == TYPE_CODE_INT
2395 || code == TYPE_CODE_ENUM
2396 || code == TYPE_CODE_RANGE
2397 || code == TYPE_CODE_CHAR
2398 || code == TYPE_CODE_BOOL);
2401 /* Return non-zero if TYPE is a pointer-like type, zero otherwise.
2402 "Pointer-like" types are those that should be passed the way
2403 pointers are: pointers and references. */
2405 is_pointer_like (struct type *type)
2407 enum type_code code = TYPE_CODE (type);
2409 return (code == TYPE_CODE_PTR
2410 || code == TYPE_CODE_REF);
2414 /* Return non-zero if TYPE is a `float singleton' or `double
2415 singleton', zero otherwise.
2417 A `T singleton' is a struct type with one member, whose type is
2418 either T or a `T singleton'. So, the following are all float
2422 struct { struct { float x; } x; };
2423 struct { struct { struct { float x; } x; } x; };
2427 All such structures are passed as if they were floats or doubles,
2428 as the (revised) ABI says. */
2430 is_float_singleton (struct type *type)
2432 if (TYPE_CODE (type) == TYPE_CODE_STRUCT && TYPE_NFIELDS (type) == 1)
2434 struct type *singleton_type = TYPE_FIELD_TYPE (type, 0);
2435 CHECK_TYPEDEF (singleton_type);
2437 return (TYPE_CODE (singleton_type) == TYPE_CODE_FLT
2438 || TYPE_CODE (singleton_type) == TYPE_CODE_DECFLOAT
2439 || is_float_singleton (singleton_type));
2446 /* Return non-zero if TYPE is a struct-like type, zero otherwise.
2447 "Struct-like" types are those that should be passed as structs are:
2450 As an odd quirk, not mentioned in the ABI, GCC passes float and
2451 double singletons as if they were a plain float, double, etc. (The
2452 corresponding union types are handled normally.) So we exclude
2453 those types here. *shrug* */
2455 is_struct_like (struct type *type)
2457 enum type_code code = TYPE_CODE (type);
2459 return (code == TYPE_CODE_UNION
2460 || (code == TYPE_CODE_STRUCT && ! is_float_singleton (type)));
2464 /* Return non-zero if TYPE is a float-like type, zero otherwise.
2465 "Float-like" types are those that should be passed as
2466 floating-point values are.
2468 You'd think this would just be floats, doubles, long doubles, etc.
2469 But as an odd quirk, not mentioned in the ABI, GCC passes float and
2470 double singletons as if they were a plain float, double, etc. (The
2471 corresponding union types are handled normally.) So we include
2472 those types here. *shrug* */
2474 is_float_like (struct type *type)
2476 return (TYPE_CODE (type) == TYPE_CODE_FLT
2477 || TYPE_CODE (type) == TYPE_CODE_DECFLOAT
2478 || is_float_singleton (type));
2483 is_power_of_two (unsigned int n)
2485 return ((n & (n - 1)) == 0);
2488 /* Return non-zero if TYPE should be passed as a pointer to a copy,
2491 s390_function_arg_pass_by_reference (struct type *type)
2493 unsigned length = TYPE_LENGTH (type);
2497 return (is_struct_like (type) && !is_power_of_two (TYPE_LENGTH (type)))
2498 || TYPE_CODE (type) == TYPE_CODE_COMPLEX
2499 || (TYPE_CODE (type) == TYPE_CODE_ARRAY && TYPE_VECTOR (type));
2502 /* Return non-zero if TYPE should be passed in a float register
2505 s390_function_arg_float (struct type *type)
2507 unsigned length = TYPE_LENGTH (type);
2511 return is_float_like (type);
2514 /* Return non-zero if TYPE should be passed in an integer register
2515 (or a pair of integer registers) if possible. */
2517 s390_function_arg_integer (struct type *type)
2519 unsigned length = TYPE_LENGTH (type);
2523 return is_integer_like (type)
2524 || is_pointer_like (type)
2525 || (is_struct_like (type) && is_power_of_two (length));
2528 /* Return ARG, a `SIMPLE_ARG', sign-extended or zero-extended to a full
2529 word as required for the ABI. */
2531 extend_simple_arg (struct gdbarch *gdbarch, struct value *arg)
2533 enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
2534 struct type *type = check_typedef (value_type (arg));
2536 /* Even structs get passed in the least significant bits of the
2537 register / memory word. It's not really right to extract them as
2538 an integer, but it does take care of the extension. */
2539 if (TYPE_UNSIGNED (type))
2540 return extract_unsigned_integer (value_contents (arg),
2541 TYPE_LENGTH (type), byte_order);
2543 return extract_signed_integer (value_contents (arg),
2544 TYPE_LENGTH (type), byte_order);
2548 /* Return the alignment required by TYPE. */
2550 alignment_of (struct type *type)
2554 if (is_integer_like (type)
2555 || is_pointer_like (type)
2556 || TYPE_CODE (type) == TYPE_CODE_FLT
2557 || TYPE_CODE (type) == TYPE_CODE_DECFLOAT)
2558 alignment = TYPE_LENGTH (type);
2559 else if (TYPE_CODE (type) == TYPE_CODE_STRUCT
2560 || TYPE_CODE (type) == TYPE_CODE_UNION)
2565 for (i = 0; i < TYPE_NFIELDS (type); i++)
2568 = alignment_of (check_typedef (TYPE_FIELD_TYPE (type, i)));
2570 if (field_alignment > alignment)
2571 alignment = field_alignment;
2577 /* Check that everything we ever return is a power of two. Lots of
2578 code doesn't want to deal with aligning things to arbitrary
2580 gdb_assert ((alignment & (alignment - 1)) == 0);
2586 /* Put the actual parameter values pointed to by ARGS[0..NARGS-1] in
2587 place to be passed to a function, as specified by the "GNU/Linux
2588 for S/390 ELF Application Binary Interface Supplement".
2590 SP is the current stack pointer. We must put arguments, links,
2591 padding, etc. whereever they belong, and return the new stack
2594 If STRUCT_RETURN is non-zero, then the function we're calling is
2595 going to return a structure by value; STRUCT_ADDR is the address of
2596 a block we've allocated for it on the stack.
2598 Our caller has taken care of any type promotions needed to satisfy
2599 prototypes or the old K&R argument-passing rules. */
2601 s390_push_dummy_call (struct gdbarch *gdbarch, struct value *function,
2602 struct regcache *regcache, CORE_ADDR bp_addr,
2603 int nargs, struct value **args, CORE_ADDR sp,
2604 int struct_return, CORE_ADDR struct_addr)
2606 struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
2607 int word_size = gdbarch_ptr_bit (gdbarch) / 8;
2608 enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
2611 /* If the i'th argument is passed as a reference to a copy, then
2612 copy_addr[i] is the address of the copy we made. */
2613 CORE_ADDR *copy_addr = alloca (nargs * sizeof (CORE_ADDR));
2615 /* Reserve space for the reference-to-copy area. */
2616 for (i = 0; i < nargs; i++)
2618 struct value *arg = args[i];
2619 struct type *type = check_typedef (value_type (arg));
2620 unsigned length = TYPE_LENGTH (type);
2622 if (s390_function_arg_pass_by_reference (type))
2625 sp = align_down (sp, alignment_of (type));
2630 /* Reserve space for the parameter area. As a conservative
2631 simplification, we assume that everything will be passed on the
2632 stack. Since every argument larger than 8 bytes will be
2633 passed by reference, we use this simple upper bound. */
2636 /* After all that, make sure it's still aligned on an eight-byte
2638 sp = align_down (sp, 8);
2640 /* Allocate the standard frame areas: the register save area, the
2641 word reserved for the compiler (which seems kind of meaningless),
2642 and the back chain pointer. */
2643 sp -= 16*word_size + 32;
2645 /* Now we have the final SP value. Make sure we didn't underflow;
2646 on 31-bit, this would result in addresses with the high bit set,
2647 which causes confusion elsewhere. Note that if we error out
2648 here, stack and registers remain untouched. */
2649 if (gdbarch_addr_bits_remove (gdbarch, sp) != sp)
2650 error (_("Stack overflow"));
2653 /* Finally, place the actual parameters, working from SP towards
2654 higher addresses. The code above is supposed to reserve enough
2659 CORE_ADDR starg = sp + 16*word_size + 32;
2661 /* A struct is returned using general register 2. */
2664 regcache_cooked_write_unsigned (regcache, S390_R0_REGNUM + gr,
2669 for (i = 0; i < nargs; i++)
2671 struct value *arg = args[i];
2672 struct type *type = check_typedef (value_type (arg));
2673 unsigned length = TYPE_LENGTH (type);
2675 if (s390_function_arg_pass_by_reference (type))
2677 /* Actually copy the argument contents to the stack slot
2678 that was reserved above. */
2679 write_memory (copy_addr[i], value_contents (arg), length);
2683 regcache_cooked_write_unsigned (regcache, S390_R0_REGNUM + gr,
2689 write_memory_unsigned_integer (starg, word_size, byte_order,
2694 else if (s390_function_arg_float (type))
2696 /* The GNU/Linux for S/390 ABI uses FPRs 0 and 2 to pass arguments,
2697 the GNU/Linux for zSeries ABI uses 0, 2, 4, and 6. */
2698 if (fr <= (tdep->abi == ABI_LINUX_S390 ? 2 : 6))
2700 /* When we store a single-precision value in an FP register,
2701 it occupies the leftmost bits. */
2702 regcache_cooked_write_part (regcache, S390_F0_REGNUM + fr,
2703 0, length, value_contents (arg));
2708 /* When we store a single-precision value in a stack slot,
2709 it occupies the rightmost bits. */
2710 starg = align_up (starg + length, word_size);
2711 write_memory (starg - length, value_contents (arg), length);
2714 else if (s390_function_arg_integer (type) && length <= word_size)
2718 /* Integer arguments are always extended to word size. */
2719 regcache_cooked_write_signed (regcache, S390_R0_REGNUM + gr,
2720 extend_simple_arg (gdbarch,
2726 /* Integer arguments are always extended to word size. */
2727 write_memory_signed_integer (starg, word_size, byte_order,
2728 extend_simple_arg (gdbarch, arg));
2732 else if (s390_function_arg_integer (type) && length == 2*word_size)
2736 regcache_cooked_write (regcache, S390_R0_REGNUM + gr,
2737 value_contents (arg));
2738 regcache_cooked_write (regcache, S390_R0_REGNUM + gr + 1,
2739 value_contents (arg) + word_size);
2744 /* If we skipped r6 because we couldn't fit a DOUBLE_ARG
2745 in it, then don't go back and use it again later. */
2748 write_memory (starg, value_contents (arg), length);
2753 internal_error (__FILE__, __LINE__, _("unknown argument type"));
2757 /* Store return PSWA. In 31-bit mode, keep addressing mode bit. */
2761 regcache_cooked_read_unsigned (regcache, S390_PSWA_REGNUM, &pswa);
2762 bp_addr = (bp_addr & 0x7fffffff) | (pswa & 0x80000000);
2764 regcache_cooked_write_unsigned (regcache, S390_RETADDR_REGNUM, bp_addr);
2766 /* Store updated stack pointer. */
2767 regcache_cooked_write_unsigned (regcache, S390_SP_REGNUM, sp);
2769 /* We need to return the 'stack part' of the frame ID,
2770 which is actually the top of the register save area. */
2771 return sp + 16*word_size + 32;
2774 /* Assuming THIS_FRAME is a dummy, return the frame ID of that
2775 dummy frame. The frame ID's base needs to match the TOS value
2776 returned by push_dummy_call, and the PC match the dummy frame's
2778 static struct frame_id
2779 s390_dummy_id (struct gdbarch *gdbarch, struct frame_info *this_frame)
2781 int word_size = gdbarch_ptr_bit (gdbarch) / 8;
2782 CORE_ADDR sp = get_frame_register_unsigned (this_frame, S390_SP_REGNUM);
2783 sp = gdbarch_addr_bits_remove (gdbarch, sp);
2785 return frame_id_build (sp + 16*word_size + 32,
2786 get_frame_pc (this_frame));
2790 s390_frame_align (struct gdbarch *gdbarch, CORE_ADDR addr)
2792 /* Both the 32- and 64-bit ABI's say that the stack pointer should
2793 always be aligned on an eight-byte boundary. */
2798 /* Function return value access. */
2800 static enum return_value_convention
2801 s390_return_value_convention (struct gdbarch *gdbarch, struct type *type)
2803 int length = TYPE_LENGTH (type);
2805 return RETURN_VALUE_STRUCT_CONVENTION;
2807 switch (TYPE_CODE (type))
2809 case TYPE_CODE_STRUCT:
2810 case TYPE_CODE_UNION:
2811 case TYPE_CODE_ARRAY:
2812 case TYPE_CODE_COMPLEX:
2813 return RETURN_VALUE_STRUCT_CONVENTION;
2816 return RETURN_VALUE_REGISTER_CONVENTION;
2820 static enum return_value_convention
2821 s390_return_value (struct gdbarch *gdbarch, struct value *function,
2822 struct type *type, struct regcache *regcache,
2823 gdb_byte *out, const gdb_byte *in)
2825 enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
2826 int word_size = gdbarch_ptr_bit (gdbarch) / 8;
2827 enum return_value_convention rvc;
2830 type = check_typedef (type);
2831 rvc = s390_return_value_convention (gdbarch, type);
2832 length = TYPE_LENGTH (type);
2838 case RETURN_VALUE_REGISTER_CONVENTION:
2839 if (TYPE_CODE (type) == TYPE_CODE_FLT
2840 || TYPE_CODE (type) == TYPE_CODE_DECFLOAT)
2842 /* When we store a single-precision value in an FP register,
2843 it occupies the leftmost bits. */
2844 regcache_cooked_write_part (regcache, S390_F0_REGNUM,
2847 else if (length <= word_size)
2849 /* Integer arguments are always extended to word size. */
2850 if (TYPE_UNSIGNED (type))
2851 regcache_cooked_write_unsigned (regcache, S390_R2_REGNUM,
2852 extract_unsigned_integer (in, length, byte_order));
2854 regcache_cooked_write_signed (regcache, S390_R2_REGNUM,
2855 extract_signed_integer (in, length, byte_order));
2857 else if (length == 2*word_size)
2859 regcache_cooked_write (regcache, S390_R2_REGNUM, in);
2860 regcache_cooked_write (regcache, S390_R3_REGNUM, in + word_size);
2863 internal_error (__FILE__, __LINE__, _("invalid return type"));
2866 case RETURN_VALUE_STRUCT_CONVENTION:
2867 error (_("Cannot set function return value."));
2875 case RETURN_VALUE_REGISTER_CONVENTION:
2876 if (TYPE_CODE (type) == TYPE_CODE_FLT
2877 || TYPE_CODE (type) == TYPE_CODE_DECFLOAT)
2879 /* When we store a single-precision value in an FP register,
2880 it occupies the leftmost bits. */
2881 regcache_cooked_read_part (regcache, S390_F0_REGNUM,
2884 else if (length <= word_size)
2886 /* Integer arguments occupy the rightmost bits. */
2887 regcache_cooked_read_part (regcache, S390_R2_REGNUM,
2888 word_size - length, length, out);
2890 else if (length == 2*word_size)
2892 regcache_cooked_read (regcache, S390_R2_REGNUM, out);
2893 regcache_cooked_read (regcache, S390_R3_REGNUM, out + word_size);
2896 internal_error (__FILE__, __LINE__, _("invalid return type"));
2899 case RETURN_VALUE_STRUCT_CONVENTION:
2900 error (_("Function return value unknown."));
2911 static const gdb_byte *
2912 s390_breakpoint_from_pc (struct gdbarch *gdbarch,
2913 CORE_ADDR *pcptr, int *lenptr)
2915 static const gdb_byte breakpoint[] = { 0x0, 0x1 };
2917 *lenptr = sizeof (breakpoint);
2922 /* Address handling. */
2925 s390_addr_bits_remove (struct gdbarch *gdbarch, CORE_ADDR addr)
2927 return addr & 0x7fffffff;
2931 s390_address_class_type_flags (int byte_size, int dwarf2_addr_class)
2934 return TYPE_INSTANCE_FLAG_ADDRESS_CLASS_1;
2940 s390_address_class_type_flags_to_name (struct gdbarch *gdbarch, int type_flags)
2942 if (type_flags & TYPE_INSTANCE_FLAG_ADDRESS_CLASS_1)
2949 s390_address_class_name_to_type_flags (struct gdbarch *gdbarch,
2951 int *type_flags_ptr)
2953 if (strcmp (name, "mode32") == 0)
2955 *type_flags_ptr = TYPE_INSTANCE_FLAG_ADDRESS_CLASS_1;
2962 /* Implementation of `gdbarch_stap_is_single_operand', as defined in
2966 s390_stap_is_single_operand (struct gdbarch *gdbarch, const char *s)
2968 return ((isdigit (*s) && s[1] == '(' && s[2] == '%') /* Displacement
2970 || *s == '%' /* Register access. */
2971 || isdigit (*s)); /* Literal number. */
2974 /* Set up gdbarch struct. */
2976 static struct gdbarch *
2977 s390_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
2979 const struct target_desc *tdesc = info.target_desc;
2980 struct tdesc_arch_data *tdesc_data = NULL;
2981 struct gdbarch *gdbarch;
2982 struct gdbarch_tdep *tdep;
2985 int have_linux_v1 = 0;
2986 int have_linux_v2 = 0;
2987 int first_pseudo_reg, last_pseudo_reg;
2989 /* Default ABI and register size. */
2990 switch (info.bfd_arch_info->mach)
2992 case bfd_mach_s390_31:
2993 tdep_abi = ABI_LINUX_S390;
2996 case bfd_mach_s390_64:
2997 tdep_abi = ABI_LINUX_ZSERIES;
3004 /* Use default target description if none provided by the target. */
3005 if (!tdesc_has_registers (tdesc))
3007 if (tdep_abi == ABI_LINUX_S390)
3008 tdesc = tdesc_s390_linux32;
3010 tdesc = tdesc_s390x_linux64;
3013 /* Check any target description for validity. */
3014 if (tdesc_has_registers (tdesc))
3016 static const char *const gprs[] = {
3017 "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
3018 "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15"
3020 static const char *const fprs[] = {
3021 "f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7",
3022 "f8", "f9", "f10", "f11", "f12", "f13", "f14", "f15"
3024 static const char *const acrs[] = {
3025 "acr0", "acr1", "acr2", "acr3", "acr4", "acr5", "acr6", "acr7",
3026 "acr8", "acr9", "acr10", "acr11", "acr12", "acr13", "acr14", "acr15"
3028 static const char *const gprs_lower[] = {
3029 "r0l", "r1l", "r2l", "r3l", "r4l", "r5l", "r6l", "r7l",
3030 "r8l", "r9l", "r10l", "r11l", "r12l", "r13l", "r14l", "r15l"
3032 static const char *const gprs_upper[] = {
3033 "r0h", "r1h", "r2h", "r3h", "r4h", "r5h", "r6h", "r7h",
3034 "r8h", "r9h", "r10h", "r11h", "r12h", "r13h", "r14h", "r15h"
3036 const struct tdesc_feature *feature;
3039 feature = tdesc_find_feature (tdesc, "org.gnu.gdb.s390.core");
3040 if (feature == NULL)
3043 tdesc_data = tdesc_data_alloc ();
3045 valid_p &= tdesc_numbered_register (feature, tdesc_data,
3046 S390_PSWM_REGNUM, "pswm");
3047 valid_p &= tdesc_numbered_register (feature, tdesc_data,
3048 S390_PSWA_REGNUM, "pswa");
3050 if (tdesc_unnumbered_register (feature, "r0"))
3052 for (i = 0; i < 16; i++)
3053 valid_p &= tdesc_numbered_register (feature, tdesc_data,
3054 S390_R0_REGNUM + i, gprs[i]);
3060 for (i = 0; i < 16; i++)
3061 valid_p &= tdesc_numbered_register (feature, tdesc_data,
3064 for (i = 0; i < 16; i++)
3065 valid_p &= tdesc_numbered_register (feature, tdesc_data,
3066 S390_R0_UPPER_REGNUM + i,
3070 feature = tdesc_find_feature (tdesc, "org.gnu.gdb.s390.fpr");
3071 if (feature == NULL)
3073 tdesc_data_cleanup (tdesc_data);
3077 valid_p &= tdesc_numbered_register (feature, tdesc_data,
3078 S390_FPC_REGNUM, "fpc");
3079 for (i = 0; i < 16; i++)
3080 valid_p &= tdesc_numbered_register (feature, tdesc_data,
3081 S390_F0_REGNUM + i, fprs[i]);
3083 feature = tdesc_find_feature (tdesc, "org.gnu.gdb.s390.acr");
3084 if (feature == NULL)
3086 tdesc_data_cleanup (tdesc_data);
3090 for (i = 0; i < 16; i++)
3091 valid_p &= tdesc_numbered_register (feature, tdesc_data,
3092 S390_A0_REGNUM + i, acrs[i]);
3094 /* Optional GNU/Linux-specific "registers". */
3095 feature = tdesc_find_feature (tdesc, "org.gnu.gdb.s390.linux");
3098 tdesc_numbered_register (feature, tdesc_data,
3099 S390_ORIG_R2_REGNUM, "orig_r2");
3101 if (tdesc_numbered_register (feature, tdesc_data,
3102 S390_LAST_BREAK_REGNUM, "last_break"))
3105 if (tdesc_numbered_register (feature, tdesc_data,
3106 S390_SYSTEM_CALL_REGNUM, "system_call"))
3109 if (have_linux_v2 > have_linux_v1)
3115 tdesc_data_cleanup (tdesc_data);
3120 /* Find a candidate among extant architectures. */
3121 for (arches = gdbarch_list_lookup_by_info (arches, &info);
3123 arches = gdbarch_list_lookup_by_info (arches->next, &info))
3125 tdep = gdbarch_tdep (arches->gdbarch);
3128 if (tdep->abi != tdep_abi)
3130 if ((tdep->gpr_full_regnum != -1) != have_upper)
3132 if (tdesc_data != NULL)
3133 tdesc_data_cleanup (tdesc_data);
3134 return arches->gdbarch;
3137 /* Otherwise create a new gdbarch for the specified machine type. */
3138 tdep = XCALLOC (1, struct gdbarch_tdep);
3139 tdep->abi = tdep_abi;
3140 gdbarch = gdbarch_alloc (&info, tdep);
3142 set_gdbarch_believe_pcc_promotion (gdbarch, 0);
3143 set_gdbarch_char_signed (gdbarch, 0);
3145 /* S/390 GNU/Linux uses either 64-bit or 128-bit long doubles.
3146 We can safely let them default to 128-bit, since the debug info
3147 will give the size of type actually used in each case. */
3148 set_gdbarch_long_double_bit (gdbarch, 128);
3149 set_gdbarch_long_double_format (gdbarch, floatformats_ia64_quad);
3151 /* Amount PC must be decremented by after a breakpoint. This is
3152 often the number of bytes returned by gdbarch_breakpoint_from_pc but not
3154 set_gdbarch_decr_pc_after_break (gdbarch, 2);
3155 /* Stack grows downward. */
3156 set_gdbarch_inner_than (gdbarch, core_addr_lessthan);
3157 set_gdbarch_breakpoint_from_pc (gdbarch, s390_breakpoint_from_pc);
3158 set_gdbarch_skip_prologue (gdbarch, s390_skip_prologue);
3159 set_gdbarch_in_function_epilogue_p (gdbarch, s390_in_function_epilogue_p);
3161 set_gdbarch_num_regs (gdbarch, S390_NUM_REGS);
3162 set_gdbarch_sp_regnum (gdbarch, S390_SP_REGNUM);
3163 set_gdbarch_fp0_regnum (gdbarch, S390_F0_REGNUM);
3164 set_gdbarch_stab_reg_to_regnum (gdbarch, s390_dwarf_reg_to_regnum);
3165 set_gdbarch_dwarf2_reg_to_regnum (gdbarch, s390_dwarf_reg_to_regnum);
3166 set_gdbarch_value_from_register (gdbarch, s390_value_from_register);
3167 set_gdbarch_regset_from_core_section (gdbarch,
3168 s390_regset_from_core_section);
3169 set_gdbarch_core_read_description (gdbarch, s390_core_read_description);
3170 set_gdbarch_cannot_store_register (gdbarch, s390_cannot_store_register);
3171 set_gdbarch_write_pc (gdbarch, s390_write_pc);
3172 set_gdbarch_pseudo_register_read (gdbarch, s390_pseudo_register_read);
3173 set_gdbarch_pseudo_register_write (gdbarch, s390_pseudo_register_write);
3174 set_tdesc_pseudo_register_name (gdbarch, s390_pseudo_register_name);
3175 set_tdesc_pseudo_register_type (gdbarch, s390_pseudo_register_type);
3176 set_tdesc_pseudo_register_reggroup_p (gdbarch,
3177 s390_pseudo_register_reggroup_p);
3178 tdesc_use_registers (gdbarch, tdesc, tdesc_data);
3180 /* Assign pseudo register numbers. */
3181 first_pseudo_reg = gdbarch_num_regs (gdbarch);
3182 last_pseudo_reg = first_pseudo_reg;
3183 tdep->gpr_full_regnum = -1;
3186 tdep->gpr_full_regnum = last_pseudo_reg;
3187 last_pseudo_reg += 16;
3189 tdep->pc_regnum = last_pseudo_reg++;
3190 tdep->cc_regnum = last_pseudo_reg++;
3191 set_gdbarch_pc_regnum (gdbarch, tdep->pc_regnum);
3192 set_gdbarch_num_pseudo_regs (gdbarch, last_pseudo_reg - first_pseudo_reg);
3194 /* Inferior function calls. */
3195 set_gdbarch_push_dummy_call (gdbarch, s390_push_dummy_call);
3196 set_gdbarch_dummy_id (gdbarch, s390_dummy_id);
3197 set_gdbarch_frame_align (gdbarch, s390_frame_align);
3198 set_gdbarch_return_value (gdbarch, s390_return_value);
3200 /* Frame handling. */
3201 dwarf2_frame_set_init_reg (gdbarch, s390_dwarf2_frame_init_reg);
3202 dwarf2_frame_set_adjust_regnum (gdbarch, s390_adjust_frame_regnum);
3203 dwarf2_append_unwinders (gdbarch);
3204 frame_base_append_sniffer (gdbarch, dwarf2_frame_base_sniffer);
3205 frame_unwind_append_unwinder (gdbarch, &s390_stub_frame_unwind);
3206 frame_unwind_append_unwinder (gdbarch, &s390_sigtramp_frame_unwind);
3207 frame_unwind_append_unwinder (gdbarch, &s390_frame_unwind);
3208 frame_base_set_default (gdbarch, &s390_frame_base);
3209 set_gdbarch_unwind_pc (gdbarch, s390_unwind_pc);
3210 set_gdbarch_unwind_sp (gdbarch, s390_unwind_sp);
3212 /* Displaced stepping. */
3213 set_gdbarch_displaced_step_copy_insn (gdbarch,
3214 simple_displaced_step_copy_insn);
3215 set_gdbarch_displaced_step_fixup (gdbarch, s390_displaced_step_fixup);
3216 set_gdbarch_displaced_step_free_closure (gdbarch,
3217 simple_displaced_step_free_closure);
3218 set_gdbarch_displaced_step_location (gdbarch,
3219 displaced_step_at_entry_point);
3220 set_gdbarch_max_insn_length (gdbarch, S390_MAX_INSTR_SIZE);
3222 /* Note that GNU/Linux is the only OS supported on this
3224 linux_init_abi (info, gdbarch);
3228 case ABI_LINUX_S390:
3229 tdep->gregset = &s390_gregset;
3230 tdep->sizeof_gregset = s390_sizeof_gregset;
3231 tdep->fpregset = &s390_fpregset;
3232 tdep->sizeof_fpregset = s390_sizeof_fpregset;
3234 set_gdbarch_addr_bits_remove (gdbarch, s390_addr_bits_remove);
3235 set_solib_svr4_fetch_link_map_offsets
3236 (gdbarch, svr4_ilp32_fetch_link_map_offsets);
3241 set_gdbarch_core_regset_sections (gdbarch,
3242 s390_linux64v2_regset_sections);
3243 else if (have_linux_v1)
3244 set_gdbarch_core_regset_sections (gdbarch,
3245 s390_linux64v1_regset_sections);
3247 set_gdbarch_core_regset_sections (gdbarch,
3248 s390_linux64_regset_sections);
3253 set_gdbarch_core_regset_sections (gdbarch,
3254 s390_linux32v2_regset_sections);
3255 else if (have_linux_v1)
3256 set_gdbarch_core_regset_sections (gdbarch,
3257 s390_linux32v1_regset_sections);
3259 set_gdbarch_core_regset_sections (gdbarch,
3260 s390_linux32_regset_sections);
3264 case ABI_LINUX_ZSERIES:
3265 tdep->gregset = &s390x_gregset;
3266 tdep->sizeof_gregset = s390x_sizeof_gregset;
3267 tdep->fpregset = &s390_fpregset;
3268 tdep->sizeof_fpregset = s390_sizeof_fpregset;
3270 set_gdbarch_long_bit (gdbarch, 64);
3271 set_gdbarch_long_long_bit (gdbarch, 64);
3272 set_gdbarch_ptr_bit (gdbarch, 64);
3273 set_solib_svr4_fetch_link_map_offsets
3274 (gdbarch, svr4_lp64_fetch_link_map_offsets);
3275 set_gdbarch_address_class_type_flags (gdbarch,
3276 s390_address_class_type_flags);
3277 set_gdbarch_address_class_type_flags_to_name (gdbarch,
3278 s390_address_class_type_flags_to_name);
3279 set_gdbarch_address_class_name_to_type_flags (gdbarch,
3280 s390_address_class_name_to_type_flags);
3283 set_gdbarch_core_regset_sections (gdbarch,
3284 s390x_linux64v2_regset_sections);
3285 else if (have_linux_v1)
3286 set_gdbarch_core_regset_sections (gdbarch,
3287 s390x_linux64v1_regset_sections);
3289 set_gdbarch_core_regset_sections (gdbarch,
3290 s390x_linux64_regset_sections);
3294 set_gdbarch_print_insn (gdbarch, print_insn_s390);
3296 set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target);
3298 /* Enable TLS support. */
3299 set_gdbarch_fetch_tls_load_module_address (gdbarch,
3300 svr4_fetch_objfile_link_map);
3302 set_gdbarch_get_siginfo_type (gdbarch, linux_get_siginfo_type);
3304 /* SystemTap functions. */
3305 set_gdbarch_stap_register_prefix (gdbarch, "%");
3306 set_gdbarch_stap_register_indirection_prefix (gdbarch, "(");
3307 set_gdbarch_stap_register_indirection_suffix (gdbarch, ")");
3308 set_gdbarch_stap_is_single_operand (gdbarch, s390_stap_is_single_operand);
3314 extern initialize_file_ftype _initialize_s390_tdep; /* -Wmissing-prototypes */
3317 _initialize_s390_tdep (void)
3319 /* Hook us into the gdbarch mechanism. */
3320 register_gdbarch_init (bfd_arch_s390, s390_gdbarch_init);
3322 /* Initialize the GNU/Linux target descriptions. */
3323 initialize_tdesc_s390_linux32 ();
3324 initialize_tdesc_s390_linux32v1 ();
3325 initialize_tdesc_s390_linux32v2 ();
3326 initialize_tdesc_s390_linux64 ();
3327 initialize_tdesc_s390_linux64v1 ();
3328 initialize_tdesc_s390_linux64v2 ();
3329 initialize_tdesc_s390x_linux64 ();
3330 initialize_tdesc_s390x_linux64v1 ();
3331 initialize_tdesc_s390x_linux64v2 ();