1 /* Target-dependent code for GDB, the GNU debugger.
3 Copyright 2001, 2002, 2003 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 2 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, write to the Free Software
22 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
25 #define S390_TDEP /* for special macros in tm-s390.h */
27 #include "arch-utils.h"
37 #include "../bfd/bfd.h"
38 #include "floatformat.h"
41 #include "gdb_assert.h"
46 /* Number of bytes of storage in the actual machine representation
49 s390_register_raw_size (int reg_nr)
51 if (S390_FP0_REGNUM <= reg_nr
52 && reg_nr < S390_FP0_REGNUM + S390_NUM_FPRS)
59 s390x_register_raw_size (int reg_nr)
61 return (reg_nr == S390_FPC_REGNUM)
62 || (reg_nr >= S390_FIRST_ACR && reg_nr <= S390_LAST_ACR) ? 4 : 8;
66 s390_cannot_fetch_register (int regno)
68 return (regno >= S390_FIRST_CR && regno < (S390_FIRST_CR + 9)) ||
69 (regno >= (S390_FIRST_CR + 12) && regno <= S390_LAST_CR);
73 s390_register_byte (int reg_nr)
75 if (reg_nr <= S390_GP_LAST_REGNUM)
76 return reg_nr * S390_GPR_SIZE;
77 if (reg_nr <= S390_LAST_ACR)
78 return S390_ACR0_OFFSET + (((reg_nr) - S390_FIRST_ACR) * S390_ACR_SIZE);
79 if (reg_nr <= S390_LAST_CR)
80 return S390_CR0_OFFSET + (((reg_nr) - S390_FIRST_CR) * S390_CR_SIZE);
81 if (reg_nr == S390_FPC_REGNUM)
82 return S390_FPC_OFFSET;
84 return S390_FP0_OFFSET + (((reg_nr) - S390_FP0_REGNUM) * S390_FPR_SIZE);
88 #define S390_MAX_INSTR_SIZE (6)
89 #define S390_SYSCALL_OPCODE (0x0a)
90 #define S390_SYSCALL_SIZE (2)
91 #define S390_SIGCONTEXT_SREGS_OFFSET (8)
92 #define S390X_SIGCONTEXT_SREGS_OFFSET (8)
93 #define S390_SIGREGS_FP0_OFFSET (144)
94 #define S390X_SIGREGS_FP0_OFFSET (216)
95 #define S390_UC_MCONTEXT_OFFSET (256)
96 #define S390X_UC_MCONTEXT_OFFSET (344)
97 #define S390_STACK_FRAME_OVERHEAD (GDB_TARGET_IS_ESAME ? 160:96)
98 #define S390_SIGNAL_FRAMESIZE (GDB_TARGET_IS_ESAME ? 160:96)
99 #define s390_NR_sigreturn 119
100 #define s390_NR_rt_sigreturn 173
104 struct frame_extra_info
108 CORE_ADDR function_start;
109 CORE_ADDR skip_prologue_function_start;
110 CORE_ADDR saved_pc_valid;
112 CORE_ADDR sig_fixed_saved_pc_valid;
113 CORE_ADDR sig_fixed_saved_pc;
114 CORE_ADDR frame_pointer_saved_pc; /* frame pointer needed for alloca */
115 CORE_ADDR stack_bought; /* amount we decrement the stack pointer by */
116 CORE_ADDR sigcontext;
120 static CORE_ADDR s390_frame_saved_pc_nofix (struct frame_info *fi);
123 s390_readinstruction (bfd_byte instr[], CORE_ADDR at,
124 struct disassemble_info *info)
128 static int s390_instrlen[] = {
134 if ((*info->read_memory_func) (at, &instr[0], 2, info))
136 instrlen = s390_instrlen[instr[0] >> 6];
139 if ((*info->read_memory_func) (at + 2, &instr[2], instrlen - 2, info))
146 s390_memset_extra_info (struct frame_extra_info *fextra_info)
148 memset (fextra_info, 0, sizeof (struct frame_extra_info));
154 s390_register_name (int reg_nr)
156 static char *register_names[] = {
158 "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
159 "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15",
160 "acr0", "acr1", "acr2", "acr3", "acr4", "acr5", "acr6", "acr7",
161 "acr8", "acr9", "acr10", "acr11", "acr12", "acr13", "acr14", "acr15",
162 "cr0", "cr1", "cr2", "cr3", "cr4", "cr5", "cr6", "cr7",
163 "cr8", "cr9", "cr10", "cr11", "cr12", "cr13", "cr14", "cr15",
165 "f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7",
166 "f8", "f9", "f10", "f11", "f12", "f13", "f14", "f15"
169 if (reg_nr <= S390_LAST_REGNUM)
170 return register_names[reg_nr];
179 s390_stab_reg_to_regnum (int regno)
181 return regno >= 64 ? S390_PSWM_REGNUM - 64 :
182 regno >= 48 ? S390_FIRST_ACR - 48 :
183 regno >= 32 ? S390_FIRST_CR - 32 :
184 regno <= 15 ? (regno + 2) :
185 S390_FP0_REGNUM + ((regno - 16) & 8) + (((regno - 16) & 3) << 1) +
186 (((regno - 16) & 4) >> 2);
190 /* Return true if REGIDX is the number of a register used to pass
191 arguments, false otherwise. */
193 is_arg_reg (int regidx)
195 return 2 <= regidx && regidx <= 6;
199 /* s390_get_frame_info based on Hartmuts
200 prologue definition in
201 gcc-2.8.1/config/l390/linux.c
203 It reads one instruction at a time & based on whether
204 it looks like prologue code or not it makes a decision on
205 whether the prologue is over, there are various state machines
206 in the code to determine if the prologue code is possilby valid.
208 This is done to hopefully allow the code survive minor revs of
214 s390_get_frame_info (CORE_ADDR pc, struct frame_extra_info *fextra_info,
215 struct frame_info *fi, int init_extra_info)
217 #define CONST_POOL_REGIDX 13
218 #define GOT_REGIDX 12
219 bfd_byte instr[S390_MAX_INSTR_SIZE];
220 CORE_ADDR test_pc = pc, test_pc2;
221 CORE_ADDR orig_sp = 0, save_reg_addr = 0, *saved_regs = NULL;
222 int valid_prologue, good_prologue = 0;
223 int gprs_saved[S390_NUM_GPRS];
224 int fprs_saved[S390_NUM_FPRS];
225 int regidx, instrlen;
226 int const_pool_state;
228 int loop_cnt, gdb_gpr_store, gdb_fpr_store;
229 int offset, expected_offset;
231 disassemble_info info;
233 /* Have we seen an instruction initializing the frame pointer yet?
234 If we've seen an `lr %r11, %r15', then frame_pointer_found is
235 non-zero, and frame_pointer_regidx == 11. Otherwise,
236 frame_pointer_found is zero and frame_pointer_regidx is 15,
237 indicating that we're using the stack pointer as our frame
239 int frame_pointer_found = 0;
240 int frame_pointer_regidx = 0xf;
242 /* What we've seen so far regarding saving the back chain link:
243 0 -- nothing yet; sp still has the same value it had at the entry
244 point. Since not all functions allocate frames, this is a
245 valid state for the prologue to finish in.
246 1 -- We've saved the original sp in some register other than the
247 frame pointer (hard-coded to be %r11, yuck).
248 save_link_regidx is the register we saved it in.
249 2 -- We've seen the initial `bras' instruction of the sequence for
250 reserving more than 32k of stack:
254 where %rX is not the constant pool register.
255 subtract_sp_regidx is %rX, and fextra_info->stack_bought is N.
256 3 -- We've reserved space for a new stack frame. This means we
257 either saw a simple `ahi %r15,-N' in state 1, or the final
258 `s %r15, ...' in state 2.
259 4 -- The frame and link are now fully initialized. We've
260 reserved space for the new stack frame, and stored the old
261 stack pointer captured in the back chain pointer field. */
262 int save_link_state = 0;
263 int save_link_regidx, subtract_sp_regidx;
265 /* What we've seen so far regarding r12 --- the GOT (Global Offset
266 Table) pointer. We expect to see `l %r12, N(%r13)', which loads
267 r12 with the offset from the constant pool to the GOT, and then
268 an `ar %r12, %r13', which adds the constant pool address,
269 yielding the GOT's address. Here's what got_state means:
271 1 -- seen `l %r12, N(%r13)', but no `ar'
272 2 -- seen load and add, so GOT pointer is totally initialized
273 When got_state is 1, then got_load_addr is the address of the
274 load instruction, and got_load_len is the length of that
277 CORE_ADDR got_load_addr = 0, got_load_len = 0;
279 const_pool_state = varargs_state = 0;
281 memset (gprs_saved, 0, sizeof (gprs_saved));
282 memset (fprs_saved, 0, sizeof (fprs_saved));
283 info.read_memory_func = deprecated_tm_print_insn_info.read_memory_func;
285 save_link_regidx = subtract_sp_regidx = 0;
288 if (fi && get_frame_base (fi))
290 orig_sp = get_frame_base (fi);
291 if (! init_extra_info && fextra_info->initialised)
292 orig_sp += fextra_info->stack_bought;
293 saved_regs = get_frame_saved_regs (fi);
295 if (init_extra_info || !fextra_info->initialised)
297 s390_memset_extra_info (fextra_info);
298 fextra_info->function_start = pc;
299 fextra_info->initialised = 1;
307 /* add the previous instruction len */
308 instrlen = s390_readinstruction (instr, test_pc, &info);
315 /* We probably are in a glibc syscall */
316 if (instr[0] == S390_SYSCALL_OPCODE && test_pc == pc)
319 if (saved_regs && fextra_info && get_next_frame (fi)
320 && get_frame_extra_info (get_next_frame (fi))
321 && get_frame_extra_info (get_next_frame (fi))->sigcontext)
323 /* We are backtracing from a signal handler */
324 save_reg_addr = get_frame_extra_info (get_next_frame (fi))->sigcontext +
325 REGISTER_BYTE (S390_GP0_REGNUM);
326 for (regidx = 0; regidx < S390_NUM_GPRS; regidx++)
328 saved_regs[S390_GP0_REGNUM + regidx] = save_reg_addr;
329 save_reg_addr += S390_GPR_SIZE;
331 save_reg_addr = get_frame_extra_info (get_next_frame (fi))->sigcontext +
332 (GDB_TARGET_IS_ESAME ? S390X_SIGREGS_FP0_OFFSET :
333 S390_SIGREGS_FP0_OFFSET);
334 for (regidx = 0; regidx < S390_NUM_FPRS; regidx++)
336 saved_regs[S390_FP0_REGNUM + regidx] = save_reg_addr;
337 save_reg_addr += S390_FPR_SIZE;
342 if (save_link_state == 0)
344 /* check for a stack relative STMG or STM */
345 if (((GDB_TARGET_IS_ESAME &&
346 ((instr[0] == 0xeb) && (instr[5] == 0x24))) ||
347 (instr[0] == 0x90)) && ((instr[2] >> 4) == 0xf))
349 regidx = (instr[1] >> 4);
352 offset = ((instr[2] & 0xf) << 8) + instr[3];
354 S390_GPR6_STACK_OFFSET + (S390_GPR_SIZE * (regidx - 6));
355 if (offset != expected_offset)
361 save_reg_addr = orig_sp + offset;
362 for (; regidx <= (instr[1] & 0xf); regidx++)
364 if (gprs_saved[regidx])
370 gprs_saved[regidx] = 1;
373 saved_regs[S390_GP0_REGNUM + regidx] = save_reg_addr;
374 save_reg_addr += S390_GPR_SIZE;
381 /* check for a stack relative STG or ST */
382 if ((save_link_state == 0 || save_link_state == 3) &&
383 ((GDB_TARGET_IS_ESAME &&
384 ((instr[0] == 0xe3) && (instr[5] == 0x24))) ||
385 (instr[0] == 0x50)) && ((instr[2] >> 4) == 0xf))
387 regidx = instr[1] >> 4;
388 offset = ((instr[2] & 0xf) << 8) + instr[3];
391 if (save_link_state == 3 && regidx == save_link_regidx)
403 S390_GPR6_STACK_OFFSET + (S390_GPR_SIZE * (regidx - 6));
404 if (offset != expected_offset)
409 if (gprs_saved[regidx])
415 gprs_saved[regidx] = 1;
418 save_reg_addr = orig_sp + offset;
419 saved_regs[S390_GP0_REGNUM + regidx] = save_reg_addr;
425 /* Check for an fp-relative STG, ST, or STM. This is probably
426 spilling an argument from a register out into a stack slot.
427 This could be a user instruction, but if we haven't included
428 any other suspicious instructions in the prologue, this
429 could only be an initializing store, which isn't too bad to
430 skip. The consequences of not including arg-to-stack spills
431 are more serious, though --- you don't see the proper values
433 if ((save_link_state == 3 || save_link_state == 4)
434 && ((instr[0] == 0x50 /* st %rA, D(%rX,%rB) */
435 && (instr[1] & 0xf) == 0 /* %rX is zero, no index reg */
436 && is_arg_reg ((instr[1] >> 4) & 0xf)
437 && ((instr[2] >> 4) & 0xf) == frame_pointer_regidx)
438 || (instr[0] == 0x90 /* stm %rA, %rB, D(%rC) */
439 && is_arg_reg ((instr[1] >> 4) & 0xf)
440 && is_arg_reg (instr[1] & 0xf)
441 && ((instr[2] >> 4) & 0xf) == frame_pointer_regidx)))
448 if (instr[0] == 0x60 && (instr[2] >> 4) == 0xf)
450 regidx = instr[1] >> 4;
451 if (regidx == 0 || regidx == 2)
453 if (fprs_saved[regidx])
458 fprs_saved[regidx] = 1;
461 save_reg_addr = orig_sp + (((instr[2] & 0xf) << 8) + instr[3]);
462 saved_regs[S390_FP0_REGNUM + regidx] = save_reg_addr;
469 if (const_pool_state == 0)
472 if (GDB_TARGET_IS_ESAME)
474 /* Check for larl CONST_POOL_REGIDX,offset on ESAME */
475 if ((instr[0] == 0xc0)
476 && (instr[1] == (CONST_POOL_REGIDX << 4)))
478 const_pool_state = 2;
485 /* Check for BASR gpr13,gpr0 used to load constant pool pointer to r13 in old compiler */
486 if (instr[0] == 0xd && (instr[1] & 0xf) == 0
487 && ((instr[1] >> 4) == CONST_POOL_REGIDX))
489 const_pool_state = 1;
494 /* Check for new fangled bras %r13,newpc to load new constant pool */
495 /* embedded in code, older pre abi compilers also emitted this stuff. */
496 if ((instr[0] == 0xa7) && ((instr[1] & 0xf) == 0x5) &&
497 ((instr[1] >> 4) == CONST_POOL_REGIDX)
498 && ((instr[2] & 0x80) == 0))
500 const_pool_state = 2;
502 (((((instr[2] & 0xf) << 8) + instr[3]) << 1) - instrlen);
507 /* Check for AGHI or AHI CONST_POOL_REGIDX,val */
508 if (const_pool_state == 1 && (instr[0] == 0xa7) &&
509 ((GDB_TARGET_IS_ESAME &&
510 (instr[1] == ((CONST_POOL_REGIDX << 4) | 0xb))) ||
511 (instr[1] == ((CONST_POOL_REGIDX << 4) | 0xa))))
513 const_pool_state = 2;
517 /* Check for LGR or LR gprx,15 */
518 if ((GDB_TARGET_IS_ESAME &&
519 instr[0] == 0xb9 && instr[1] == 0x04 && (instr[3] & 0xf) == 0xf) ||
520 (instr[0] == 0x18 && (instr[1] & 0xf) == 0xf))
522 if (GDB_TARGET_IS_ESAME)
523 regidx = instr[3] >> 4;
525 regidx = instr[1] >> 4;
526 if (save_link_state == 0 && regidx != 0xb)
528 /* Almost defintely code for
529 decrementing the stack pointer
530 ( i.e. a non leaf function
531 or else leaf with locals ) */
532 save_link_regidx = regidx;
537 /* We use this frame pointer for alloca
538 unfortunately we need to assume its gpr11
539 otherwise we would need a smarter prologue
541 if (!frame_pointer_found && regidx == 0xb)
543 frame_pointer_regidx = 0xb;
544 frame_pointer_found = 1;
546 fextra_info->frame_pointer_saved_pc = test_pc;
551 /* Check for AHI or AGHI gpr15,val */
552 if (save_link_state == 1 && (instr[0] == 0xa7) &&
553 ((GDB_TARGET_IS_ESAME && (instr[1] == 0xfb)) || (instr[1] == 0xfa)))
556 fextra_info->stack_bought =
557 -extract_signed_integer (&instr[2], 2);
562 /* Alternatively check for the complex construction for
563 buying more than 32k of stack
566 s %r15,0(%gprx) gprx currently r1 */
567 if ((save_link_state == 1) && (instr[0] == 0xa7)
568 && ((instr[1] & 0xf) == 0x5) && (instr[2] == 0)
569 && (instr[3] == 0x4) && ((instr[1] >> 4) != CONST_POOL_REGIDX))
571 subtract_sp_regidx = instr[1] >> 4;
574 target_read_memory (test_pc + instrlen,
575 (char *) &fextra_info->stack_bought,
576 sizeof (fextra_info->stack_bought));
581 if (save_link_state == 2 && instr[0] == 0x5b
582 && instr[1] == 0xf0 &&
583 instr[2] == (subtract_sp_regidx << 4) && instr[3] == 0)
589 /* check for LA gprx,offset(15) used for varargs */
590 if ((instr[0] == 0x41) && ((instr[2] >> 4) == 0xf) &&
591 ((instr[1] & 0xf) == 0))
593 /* some code uses gpr7 to point to outgoing args */
594 if (((instr[1] >> 4) == 7) && (save_link_state == 0) &&
595 ((instr[2] & 0xf) == 0)
596 && (instr[3] == S390_STACK_FRAME_OVERHEAD))
601 if (varargs_state == 1)
608 /* Check for a GOT load */
610 if (GDB_TARGET_IS_ESAME)
612 /* Check for larl GOT_REGIDX, on ESAME */
613 if ((got_state == 0) && (instr[0] == 0xc0)
614 && (instr[1] == (GOT_REGIDX << 4)))
623 /* check for l GOT_REGIDX,x(CONST_POOL_REGIDX) */
624 if (got_state == 0 && const_pool_state == 2 && instr[0] == 0x58
625 && (instr[2] == (CONST_POOL_REGIDX << 4))
626 && ((instr[1] >> 4) == GOT_REGIDX))
629 got_load_addr = test_pc;
630 got_load_len = instrlen;
634 /* Check for subsequent ar got_regidx,basr_regidx */
635 if (got_state == 1 && instr[0] == 0x1a &&
636 instr[1] == ((GOT_REGIDX << 4) | CONST_POOL_REGIDX))
644 while (valid_prologue && good_prologue);
647 /* If this function doesn't reference the global offset table,
648 then the compiler may use r12 for other things. If the last
649 instruction we saw was a load of r12 from the constant pool,
650 with no subsequent add to make the address PC-relative, then
651 the load was probably a genuine body instruction; don't treat
652 it as part of the prologue. */
654 && got_load_addr + got_load_len == test_pc)
656 test_pc = got_load_addr;
657 instrlen = got_load_len;
660 good_prologue = (((const_pool_state == 0) || (const_pool_state == 2)) &&
661 ((save_link_state == 0) || (save_link_state == 4)) &&
662 ((varargs_state == 0) || (varargs_state == 2)));
666 fextra_info->good_prologue = good_prologue;
667 fextra_info->skip_prologue_function_start =
668 (good_prologue ? test_pc : pc);
671 /* The SP's element of the saved_regs array holds the old SP,
672 not the address at which it is saved. */
673 saved_regs[S390_SP_REGNUM] = orig_sp;
679 s390_check_function_end (CORE_ADDR pc)
681 bfd_byte instr[S390_MAX_INSTR_SIZE];
682 disassemble_info info;
683 int regidx, instrlen;
685 info.read_memory_func = deprecated_tm_print_insn_info.read_memory_func;
686 instrlen = s390_readinstruction (instr, pc, &info);
690 if (instrlen != 2 || instr[0] != 07 || (instr[1] >> 4) != 0xf)
692 regidx = instr[1] & 0xf;
693 /* Check for LMG or LG */
695 s390_readinstruction (instr, pc - (GDB_TARGET_IS_ESAME ? 6 : 4), &info);
698 if (GDB_TARGET_IS_ESAME)
701 if (instrlen != 6 || instr[0] != 0xeb || instr[5] != 0x4)
704 else if (instrlen != 4 || instr[0] != 0x98)
708 if ((instr[2] >> 4) != 0xf)
712 instrlen = s390_readinstruction (instr, pc - (GDB_TARGET_IS_ESAME ? 12 : 8),
716 if (GDB_TARGET_IS_ESAME)
719 if (instrlen != 6 || instr[0] != 0xe3 || instr[5] != 0x4)
725 if (instrlen != 4 || instr[0] != 0x58)
728 if (instr[2] >> 4 != 0xf)
730 if (instr[1] >> 4 != regidx)
736 s390_sniff_pc_function_start (CORE_ADDR pc, struct frame_info *fi)
738 CORE_ADDR function_start, test_function_start;
739 int loop_cnt, err, function_end;
740 struct frame_extra_info fextra_info;
741 function_start = get_pc_function_start (pc);
743 if (function_start == 0)
745 test_function_start = pc;
746 if (test_function_start & 1)
747 return 0; /* This has to be bogus */
753 s390_get_frame_info (test_function_start, &fextra_info, fi, 1);
755 test_function_start -= 2;
756 function_end = s390_check_function_end (test_function_start);
758 while (!(function_end == 1 || err || loop_cnt >= 4096 ||
759 (fextra_info.good_prologue)));
760 if (fextra_info.good_prologue)
761 function_start = fextra_info.function_start;
762 else if (function_end == 1)
763 function_start = test_function_start;
765 return function_start;
771 s390_function_start (struct frame_info *fi)
773 CORE_ADDR function_start = 0;
775 if (get_frame_extra_info (fi) && get_frame_extra_info (fi)->initialised)
776 function_start = get_frame_extra_info (fi)->function_start;
777 else if (get_frame_pc (fi))
778 function_start = get_frame_func (fi);
779 return function_start;
786 s390_frameless_function_invocation (struct frame_info *fi)
788 struct frame_extra_info fextra_info, *fextra_info_ptr;
791 if (get_next_frame (fi) == NULL) /* no may be frameless */
793 if (get_frame_extra_info (fi))
794 fextra_info_ptr = get_frame_extra_info (fi);
797 fextra_info_ptr = &fextra_info;
798 s390_get_frame_info (s390_sniff_pc_function_start (get_frame_pc (fi), fi),
799 fextra_info_ptr, fi, 1);
801 frameless = ((fextra_info_ptr->stack_bought == 0));
809 s390_is_sigreturn (CORE_ADDR pc, struct frame_info *sighandler_fi,
810 CORE_ADDR *sregs, CORE_ADDR *sigcaller_pc)
812 bfd_byte instr[S390_MAX_INSTR_SIZE];
813 disassemble_info info;
818 CORE_ADDR temp_sregs;
820 scontext = temp_sregs = 0;
822 info.read_memory_func = deprecated_tm_print_insn_info.read_memory_func;
823 instrlen = s390_readinstruction (instr, pc, &info);
826 if (((instrlen == S390_SYSCALL_SIZE) &&
827 (instr[0] == S390_SYSCALL_OPCODE)) &&
828 ((instr[1] == s390_NR_sigreturn) || (instr[1] == s390_NR_rt_sigreturn)))
832 if (s390_frameless_function_invocation (sighandler_fi))
833 orig_sp = get_frame_base (sighandler_fi);
835 orig_sp = ADDR_BITS_REMOVE ((CORE_ADDR)
836 read_memory_integer (get_frame_base (sighandler_fi),
838 if (orig_sp && sigcaller_pc)
840 scontext = orig_sp + S390_SIGNAL_FRAMESIZE;
841 if (pc == scontext && instr[1] == s390_NR_rt_sigreturn)
843 /* We got a new style rt_signal */
844 /* get address of read ucontext->uc_mcontext */
845 temp_sregs = orig_sp + (GDB_TARGET_IS_ESAME ?
846 S390X_UC_MCONTEXT_OFFSET :
847 S390_UC_MCONTEXT_OFFSET);
851 /* read sigcontext->sregs */
852 temp_sregs = ADDR_BITS_REMOVE ((CORE_ADDR)
853 read_memory_integer (scontext
857 S390X_SIGCONTEXT_SREGS_OFFSET
859 S390_SIGCONTEXT_SREGS_OFFSET),
863 /* read sigregs->psw.addr */
865 ADDR_BITS_REMOVE ((CORE_ADDR)
866 read_memory_integer (temp_sregs +
869 S390_PSW_ADDR_SIZE));
880 We need to do something better here but this will keep us out of trouble
882 For some reason the blockframe.c calls us with fi->next->fromleaf
883 so this seems of little use to us. */
885 s390_init_frame_pc_first (int next_fromleaf, struct frame_info *fi)
887 CORE_ADDR sigcaller_pc;
891 pc = ADDR_BITS_REMOVE (read_register (S390_RETADDR_REGNUM));
892 /* fix signal handlers */
894 else if (get_next_frame (fi) && get_frame_pc (get_next_frame (fi)))
895 pc = s390_frame_saved_pc_nofix (get_next_frame (fi));
896 if (pc && get_next_frame (fi) && get_frame_base (get_next_frame (fi))
897 && s390_is_sigreturn (pc, get_next_frame (fi), NULL, &sigcaller_pc))
905 s390_init_extra_frame_info (int fromleaf, struct frame_info *fi)
907 frame_extra_info_zalloc (fi, sizeof (struct frame_extra_info));
908 if (get_frame_pc (fi))
909 s390_get_frame_info (s390_sniff_pc_function_start (get_frame_pc (fi), fi),
910 get_frame_extra_info (fi), fi, 1);
912 s390_memset_extra_info (get_frame_extra_info (fi));
915 /* If saved registers of frame FI are not known yet, read and cache them.
916 &FEXTRA_INFOP contains struct frame_extra_info; TDATAP can be NULL,
917 in which case the framedata are read. */
920 s390_frame_init_saved_regs (struct frame_info *fi)
925 if (get_frame_saved_regs (fi) == NULL)
927 /* zalloc memsets the saved regs */
928 frame_saved_regs_zalloc (fi);
929 if (get_frame_pc (fi))
931 quick = (get_frame_extra_info (fi)
932 && get_frame_extra_info (fi)->initialised
933 && get_frame_extra_info (fi)->good_prologue);
934 s390_get_frame_info (quick
935 ? get_frame_extra_info (fi)->function_start
936 : s390_sniff_pc_function_start (get_frame_pc (fi), fi),
937 get_frame_extra_info (fi), fi, !quick);
945 s390_frame_saved_pc_nofix (struct frame_info *fi)
947 if (get_frame_extra_info (fi) && get_frame_extra_info (fi)->saved_pc_valid)
948 return get_frame_extra_info (fi)->saved_pc;
950 if (deprecated_generic_find_dummy_frame (get_frame_pc (fi),
951 get_frame_base (fi)))
952 return deprecated_read_register_dummy (get_frame_pc (fi),
953 get_frame_base (fi), S390_PC_REGNUM);
955 s390_frame_init_saved_regs (fi);
956 if (get_frame_extra_info (fi))
958 get_frame_extra_info (fi)->saved_pc_valid = 1;
959 if (get_frame_extra_info (fi)->good_prologue
960 && get_frame_saved_regs (fi)[S390_RETADDR_REGNUM])
961 get_frame_extra_info (fi)->saved_pc
962 = ADDR_BITS_REMOVE (read_memory_integer
963 (get_frame_saved_regs (fi)[S390_RETADDR_REGNUM],
966 get_frame_extra_info (fi)->saved_pc
967 = ADDR_BITS_REMOVE (read_register (S390_RETADDR_REGNUM));
968 return get_frame_extra_info (fi)->saved_pc;
974 s390_frame_saved_pc (struct frame_info *fi)
976 CORE_ADDR saved_pc = 0, sig_pc;
978 if (get_frame_extra_info (fi)
979 && get_frame_extra_info (fi)->sig_fixed_saved_pc_valid)
980 return get_frame_extra_info (fi)->sig_fixed_saved_pc;
981 saved_pc = s390_frame_saved_pc_nofix (fi);
983 if (get_frame_extra_info (fi))
985 get_frame_extra_info (fi)->sig_fixed_saved_pc_valid = 1;
988 if (s390_is_sigreturn (saved_pc, fi, NULL, &sig_pc))
991 get_frame_extra_info (fi)->sig_fixed_saved_pc = saved_pc;
999 /* We want backtraces out of signal handlers so we don't set
1000 (get_frame_type (thisframe) == SIGTRAMP_FRAME) to 1 */
1003 s390_frame_chain (struct frame_info *thisframe)
1005 CORE_ADDR prev_fp = 0;
1007 if (deprecated_generic_find_dummy_frame (get_frame_pc (thisframe),
1008 get_frame_base (thisframe)))
1009 return deprecated_read_register_dummy (get_frame_pc (thisframe),
1010 get_frame_base (thisframe),
1015 CORE_ADDR sregs = 0;
1016 struct frame_extra_info prev_fextra_info;
1018 memset (&prev_fextra_info, 0, sizeof (prev_fextra_info));
1019 if (get_frame_pc (thisframe))
1021 CORE_ADDR saved_pc, sig_pc;
1023 saved_pc = s390_frame_saved_pc_nofix (thisframe);
1027 s390_is_sigreturn (saved_pc, thisframe, &sregs, &sig_pc)))
1029 s390_get_frame_info (s390_sniff_pc_function_start
1030 (saved_pc, NULL), &prev_fextra_info, NULL,
1036 /* read sigregs,regs.gprs[11 or 15] */
1037 prev_fp = read_memory_integer (sregs +
1038 REGISTER_BYTE (S390_GP0_REGNUM +
1040 frame_pointer_saved_pc
1043 get_frame_extra_info (thisframe)->sigcontext = sregs;
1047 if (get_frame_saved_regs (thisframe))
1051 if (prev_fextra_info.frame_pointer_saved_pc
1052 && get_frame_saved_regs (thisframe)[S390_FRAME_REGNUM])
1053 regno = S390_FRAME_REGNUM;
1055 regno = S390_SP_REGNUM;
1057 if (get_frame_saved_regs (thisframe)[regno])
1059 /* The SP's entry of `saved_regs' is special. */
1060 if (regno == S390_SP_REGNUM)
1061 prev_fp = get_frame_saved_regs (thisframe)[regno];
1064 read_memory_integer (get_frame_saved_regs (thisframe)[regno],
1070 return ADDR_BITS_REMOVE (prev_fp);
1074 Whether struct frame_extra_info is actually needed I'll have to figure
1075 out as our frames are similar to rs6000 there is a possibility
1076 i386 dosen't need it. */
1080 /* a given return value in `regbuf' with a type `valtype', extract and copy its
1081 value into `valbuf' */
1083 s390_extract_return_value (struct type *valtype, char *regbuf, char *valbuf)
1085 /* floats and doubles are returned in fpr0. fpr's have a size of 8 bytes.
1086 We need to truncate the return value into float size (4 byte) if
1088 int len = TYPE_LENGTH (valtype);
1090 if (TYPE_CODE (valtype) == TYPE_CODE_FLT)
1091 memcpy (valbuf, ®buf[REGISTER_BYTE (S390_FP0_REGNUM)], len);
1095 /* return value is copied starting from r2. */
1096 if (TYPE_LENGTH (valtype) < S390_GPR_SIZE)
1097 offset = S390_GPR_SIZE - TYPE_LENGTH (valtype);
1099 regbuf + REGISTER_BYTE (S390_GP0_REGNUM + 2) + offset,
1100 TYPE_LENGTH (valtype));
1106 s390_promote_integer_argument (struct type *valtype, char *valbuf,
1107 char *reg_buff, int *arglen)
1109 char *value = valbuf;
1110 int len = TYPE_LENGTH (valtype);
1112 if (len < S390_GPR_SIZE)
1114 /* We need to upgrade this value to a register to pass it correctly */
1115 int idx, diff = S390_GPR_SIZE - len, negative =
1116 (!TYPE_UNSIGNED (valtype) && value[0] & 0x80);
1117 for (idx = 0; idx < S390_GPR_SIZE; idx++)
1119 reg_buff[idx] = (idx < diff ? (negative ? 0xff : 0x0) :
1123 *arglen = S390_GPR_SIZE;
1127 if (len & (S390_GPR_SIZE - 1))
1129 fprintf_unfiltered (gdb_stderr,
1130 "s390_promote_integer_argument detected an argument not "
1131 "a multiple of S390_GPR_SIZE & greater than S390_GPR_SIZE "
1132 "we might not deal with this correctly.\n");
1141 s390_store_return_value (struct type *valtype, char *valbuf)
1144 char *reg_buff = alloca (max (S390_FPR_SIZE, DEPRECATED_REGISTER_SIZE)), *value;
1146 if (TYPE_CODE (valtype) == TYPE_CODE_FLT)
1148 if (TYPE_LENGTH (valtype) == 4
1149 || TYPE_LENGTH (valtype) == 8)
1150 deprecated_write_register_bytes (REGISTER_BYTE (S390_FP0_REGNUM),
1151 valbuf, TYPE_LENGTH (valtype));
1153 error ("GDB is unable to return `long double' values "
1154 "on this architecture.");
1159 s390_promote_integer_argument (valtype, valbuf, reg_buff, &arglen);
1160 /* Everything else is returned in GPR2 and up. */
1161 deprecated_write_register_bytes (REGISTER_BYTE (S390_GP0_REGNUM + 2),
1166 gdb_print_insn_s390 (bfd_vma memaddr, disassemble_info * info)
1168 bfd_byte instrbuff[S390_MAX_INSTR_SIZE];
1171 instrlen = s390_readinstruction (instrbuff, (CORE_ADDR) memaddr, info);
1174 (*info->memory_error_func) (instrlen, memaddr, info);
1177 for (cnt = 0; cnt < instrlen; cnt++)
1178 info->fprintf_func (info->stream, "%02X ", instrbuff[cnt]);
1179 for (cnt = instrlen; cnt < S390_MAX_INSTR_SIZE; cnt++)
1180 info->fprintf_func (info->stream, " ");
1181 instrlen = print_insn_s390 (memaddr, info);
1187 /* Not the most efficent code in the world */
1189 s390_fp_regnum (void)
1191 int regno = S390_SP_REGNUM;
1192 struct frame_extra_info fextra_info;
1194 CORE_ADDR pc = ADDR_BITS_REMOVE (read_register (S390_PC_REGNUM));
1196 s390_get_frame_info (s390_sniff_pc_function_start (pc, NULL), &fextra_info,
1198 if (fextra_info.frame_pointer_saved_pc)
1199 regno = S390_FRAME_REGNUM;
1206 return read_register (s390_fp_regnum ());
1211 s390_pop_frame_regular (struct frame_info *frame)
1215 write_register (S390_PC_REGNUM, DEPRECATED_FRAME_SAVED_PC (frame));
1217 /* Restore any saved registers. */
1218 if (get_frame_saved_regs (frame))
1220 for (regnum = 0; regnum < NUM_REGS; regnum++)
1221 if (get_frame_saved_regs (frame)[regnum] != 0)
1225 value = read_memory_unsigned_integer (get_frame_saved_regs (frame)[regnum],
1226 REGISTER_RAW_SIZE (regnum));
1227 write_register (regnum, value);
1230 /* Actually cut back the stack. Remember that the SP's element of
1231 saved_regs is the old SP itself, not the address at which it is
1233 write_register (S390_SP_REGNUM, get_frame_saved_regs (frame)[S390_SP_REGNUM]);
1236 /* Throw away any cached frame information. */
1237 flush_cached_frames ();
1241 /* Destroy the innermost (Top-Of-Stack) stack frame, restoring the
1242 machine state that was in effect before the frame was created.
1243 Used in the contexts of the "return" command, and of
1244 target function calls from the debugger. */
1246 s390_pop_frame (void)
1248 /* This function checks for and handles generic dummy frames, and
1249 calls back to our function for ordinary frames. */
1250 generic_pop_current_frame (s390_pop_frame_regular);
1254 /* Return non-zero if TYPE is an integer-like type, zero otherwise.
1255 "Integer-like" types are those that should be passed the way
1256 integers are: integers, enums, ranges, characters, and booleans. */
1258 is_integer_like (struct type *type)
1260 enum type_code code = TYPE_CODE (type);
1262 return (code == TYPE_CODE_INT
1263 || code == TYPE_CODE_ENUM
1264 || code == TYPE_CODE_RANGE
1265 || code == TYPE_CODE_CHAR
1266 || code == TYPE_CODE_BOOL);
1270 /* Return non-zero if TYPE is a pointer-like type, zero otherwise.
1271 "Pointer-like" types are those that should be passed the way
1272 pointers are: pointers and references. */
1274 is_pointer_like (struct type *type)
1276 enum type_code code = TYPE_CODE (type);
1278 return (code == TYPE_CODE_PTR
1279 || code == TYPE_CODE_REF);
1283 /* Return non-zero if TYPE is a `float singleton' or `double
1284 singleton', zero otherwise.
1286 A `T singleton' is a struct type with one member, whose type is
1287 either T or a `T singleton'. So, the following are all float
1291 struct { struct { float x; } x; };
1292 struct { struct { struct { float x; } x; } x; };
1296 WHY THE HECK DO WE CARE ABOUT THIS??? Well, it turns out that GCC
1297 passes all float singletons and double singletons as if they were
1298 simply floats or doubles. This is *not* what the ABI says it
1301 is_float_singleton (struct type *type)
1303 return (TYPE_CODE (type) == TYPE_CODE_STRUCT
1304 && TYPE_NFIELDS (type) == 1
1305 && (TYPE_CODE (TYPE_FIELD_TYPE (type, 0)) == TYPE_CODE_FLT
1306 || is_float_singleton (TYPE_FIELD_TYPE (type, 0))));
1310 /* Return non-zero if TYPE is a struct-like type, zero otherwise.
1311 "Struct-like" types are those that should be passed as structs are:
1314 As an odd quirk, not mentioned in the ABI, GCC passes float and
1315 double singletons as if they were a plain float, double, etc. (The
1316 corresponding union types are handled normally.) So we exclude
1317 those types here. *shrug* */
1319 is_struct_like (struct type *type)
1321 enum type_code code = TYPE_CODE (type);
1323 return (code == TYPE_CODE_UNION
1324 || (code == TYPE_CODE_STRUCT && ! is_float_singleton (type)));
1328 /* Return non-zero if TYPE is a float-like type, zero otherwise.
1329 "Float-like" types are those that should be passed as
1330 floating-point values are.
1332 You'd think this would just be floats, doubles, long doubles, etc.
1333 But as an odd quirk, not mentioned in the ABI, GCC passes float and
1334 double singletons as if they were a plain float, double, etc. (The
1335 corresponding union types are handled normally.) So we exclude
1336 those types here. *shrug* */
1338 is_float_like (struct type *type)
1340 return (TYPE_CODE (type) == TYPE_CODE_FLT
1341 || is_float_singleton (type));
1345 /* Return non-zero if TYPE is considered a `DOUBLE_OR_FLOAT', as
1346 defined by the parameter passing conventions described in the
1347 "GNU/Linux for S/390 ELF Application Binary Interface Supplement".
1348 Otherwise, return zero. */
1350 is_double_or_float (struct type *type)
1352 return (is_float_like (type)
1353 && (TYPE_LENGTH (type) == 4
1354 || TYPE_LENGTH (type) == 8));
1358 /* Return non-zero if TYPE is considered a `SIMPLE_ARG', as defined by
1359 the parameter passing conventions described in the "GNU/Linux for
1360 S/390 ELF Application Binary Interface Supplement". Return zero
1363 is_simple_arg (struct type *type)
1365 unsigned length = TYPE_LENGTH (type);
1367 /* This is almost a direct translation of the ABI's language, except
1368 that we have to exclude 8-byte structs; those are DOUBLE_ARGs. */
1369 return ((is_integer_like (type) && length <= 4)
1370 || is_pointer_like (type)
1371 || (is_struct_like (type) && length != 8)
1372 || (is_float_like (type) && length == 16));
1376 /* Return non-zero if TYPE should be passed as a pointer to a copy,
1377 zero otherwise. TYPE must be a SIMPLE_ARG, as recognized by
1380 pass_by_copy_ref (struct type *type)
1382 unsigned length = TYPE_LENGTH (type);
1384 return ((is_struct_like (type) && length != 1 && length != 2 && length != 4)
1385 || (is_float_like (type) && length == 16));
1389 /* Return ARG, a `SIMPLE_ARG', sign-extended or zero-extended to a full
1390 word as required for the ABI. */
1392 extend_simple_arg (struct value *arg)
1394 struct type *type = VALUE_TYPE (arg);
1396 /* Even structs get passed in the least significant bits of the
1397 register / memory word. It's not really right to extract them as
1398 an integer, but it does take care of the extension. */
1399 if (TYPE_UNSIGNED (type))
1400 return extract_unsigned_integer (VALUE_CONTENTS (arg),
1401 TYPE_LENGTH (type));
1403 return extract_signed_integer (VALUE_CONTENTS (arg),
1404 TYPE_LENGTH (type));
1408 /* Return non-zero if TYPE is a `DOUBLE_ARG', as defined by the
1409 parameter passing conventions described in the "GNU/Linux for S/390
1410 ELF Application Binary Interface Supplement". Return zero
1413 is_double_arg (struct type *type)
1415 unsigned length = TYPE_LENGTH (type);
1417 return ((is_integer_like (type)
1418 || is_struct_like (type))
1423 /* Round ADDR up to the next N-byte boundary. N must be a power of
1426 round_up (CORE_ADDR addr, int n)
1428 /* Check that N is really a power of two. */
1429 gdb_assert (n && (n & (n-1)) == 0);
1430 return ((addr + n - 1) & -n);
1434 /* Round ADDR down to the next N-byte boundary. N must be a power of
1437 round_down (CORE_ADDR addr, int n)
1439 /* Check that N is really a power of two. */
1440 gdb_assert (n && (n & (n-1)) == 0);
1445 /* Return the alignment required by TYPE. */
1447 alignment_of (struct type *type)
1451 if (is_integer_like (type)
1452 || is_pointer_like (type)
1453 || TYPE_CODE (type) == TYPE_CODE_FLT)
1454 alignment = TYPE_LENGTH (type);
1455 else if (TYPE_CODE (type) == TYPE_CODE_STRUCT
1456 || TYPE_CODE (type) == TYPE_CODE_UNION)
1461 for (i = 0; i < TYPE_NFIELDS (type); i++)
1463 int field_alignment = alignment_of (TYPE_FIELD_TYPE (type, i));
1465 if (field_alignment > alignment)
1466 alignment = field_alignment;
1472 /* Check that everything we ever return is a power of two. Lots of
1473 code doesn't want to deal with aligning things to arbitrary
1475 gdb_assert ((alignment & (alignment - 1)) == 0);
1481 /* Put the actual parameter values pointed to by ARGS[0..NARGS-1] in
1482 place to be passed to a function, as specified by the "GNU/Linux
1483 for S/390 ELF Application Binary Interface Supplement".
1485 SP is the current stack pointer. We must put arguments, links,
1486 padding, etc. whereever they belong, and return the new stack
1489 If STRUCT_RETURN is non-zero, then the function we're calling is
1490 going to return a structure by value; STRUCT_ADDR is the address of
1491 a block we've allocated for it on the stack.
1493 Our caller has taken care of any type promotions needed to satisfy
1494 prototypes or the old K&R argument-passing rules. */
1496 s390_push_arguments (int nargs, struct value **args, CORE_ADDR sp,
1497 int struct_return, CORE_ADDR struct_addr)
1500 int pointer_size = (TARGET_PTR_BIT / TARGET_CHAR_BIT);
1502 /* The number of arguments passed by reference-to-copy. */
1505 /* If the i'th argument is passed as a reference to a copy, then
1506 copy_addr[i] is the address of the copy we made. */
1507 CORE_ADDR *copy_addr = alloca (nargs * sizeof (CORE_ADDR));
1509 /* Build the reference-to-copy area. */
1511 for (i = 0; i < nargs; i++)
1513 struct value *arg = args[i];
1514 struct type *type = VALUE_TYPE (arg);
1515 unsigned length = TYPE_LENGTH (type);
1517 if (is_simple_arg (type)
1518 && pass_by_copy_ref (type))
1521 sp = round_down (sp, alignment_of (type));
1522 write_memory (sp, VALUE_CONTENTS (arg), length);
1528 /* Reserve space for the parameter area. As a conservative
1529 simplification, we assume that everything will be passed on the
1534 for (i = 0; i < nargs; i++)
1536 struct value *arg = args[i];
1537 struct type *type = VALUE_TYPE (arg);
1538 int length = TYPE_LENGTH (type);
1540 sp = round_down (sp, alignment_of (type));
1542 /* SIMPLE_ARG values get extended to 32 bits. Assume every
1544 if (length < 4) length = 4;
1549 /* Include space for any reference-to-copy pointers. */
1550 sp = round_down (sp, pointer_size);
1551 sp -= num_copies * pointer_size;
1553 /* After all that, make sure it's still aligned on an eight-byte
1555 sp = round_down (sp, 8);
1557 /* Finally, place the actual parameters, working from SP towards
1558 higher addresses. The code above is supposed to reserve enough
1563 CORE_ADDR starg = sp;
1565 for (i = 0; i < nargs; i++)
1567 struct value *arg = args[i];
1568 struct type *type = VALUE_TYPE (arg);
1570 if (is_double_or_float (type)
1573 /* When we store a single-precision value in an FP register,
1574 it occupies the leftmost bits. */
1575 deprecated_write_register_bytes (REGISTER_BYTE (S390_FP0_REGNUM + fr),
1576 VALUE_CONTENTS (arg),
1577 TYPE_LENGTH (type));
1580 else if (is_simple_arg (type)
1583 /* Do we need to pass a pointer to our copy of this
1585 if (pass_by_copy_ref (type))
1586 write_register (S390_GP0_REGNUM + gr, copy_addr[i]);
1588 write_register (S390_GP0_REGNUM + gr, extend_simple_arg (arg));
1592 else if (is_double_arg (type)
1595 deprecated_write_register_gen (S390_GP0_REGNUM + gr,
1596 VALUE_CONTENTS (arg));
1597 deprecated_write_register_gen (S390_GP0_REGNUM + gr + 1,
1598 VALUE_CONTENTS (arg) + 4);
1603 /* The `OTHER' case. */
1604 enum type_code code = TYPE_CODE (type);
1605 unsigned length = TYPE_LENGTH (type);
1607 /* If we skipped r6 because we couldn't fit a DOUBLE_ARG
1608 in it, then don't go back and use it again later. */
1609 if (is_double_arg (type) && gr == 6)
1612 if (is_simple_arg (type))
1614 /* Simple args are always either extended to 32 bits,
1616 starg = round_up (starg, 4);
1618 /* Do we need to pass a pointer to our copy of this
1620 if (pass_by_copy_ref (type))
1621 write_memory_signed_integer (starg, pointer_size,
1624 /* Simple args are always extended to 32 bits. */
1625 write_memory_signed_integer (starg, 4,
1626 extend_simple_arg (arg));
1631 /* You'd think we should say:
1632 starg = round_up (starg, alignment_of (type));
1633 Unfortunately, GCC seems to simply align the stack on
1634 a four-byte boundary, even when passing doubles. */
1635 starg = round_up (starg, 4);
1636 write_memory (starg, VALUE_CONTENTS (arg), length);
1643 /* Allocate the standard frame areas: the register save area, the
1644 word reserved for the compiler (which seems kind of meaningless),
1645 and the back chain pointer. */
1648 /* Write the back chain pointer into the first word of the stack
1649 frame. This will help us get backtraces from within functions
1651 write_memory_unsigned_integer (sp, (TARGET_PTR_BIT / TARGET_CHAR_BIT),
1652 deprecated_read_fp ());
1659 s390_frame_align (struct gdbarch *gdbarch, CORE_ADDR addr)
1661 /* Both the 32- and 64-bit ABI's say that the stack pointer should
1662 always be aligned on an eight-byte boundary. */
1668 s390_use_struct_convention (int gcc_p, struct type *value_type)
1670 enum type_code code = TYPE_CODE (value_type);
1672 return (code == TYPE_CODE_STRUCT
1673 || code == TYPE_CODE_UNION);
1677 /* Return the GDB type object for the "standard" data type
1678 of data in register N. */
1679 static struct type *
1680 s390_register_virtual_type (int regno)
1682 if (S390_FP0_REGNUM <= regno && regno < S390_FP0_REGNUM + S390_NUM_FPRS)
1683 return builtin_type_double;
1685 return builtin_type_int;
1689 static struct type *
1690 s390x_register_virtual_type (int regno)
1692 return (regno == S390_FPC_REGNUM) ||
1693 (regno >= S390_FIRST_ACR && regno <= S390_LAST_ACR) ? builtin_type_int :
1694 (regno >= S390_FP0_REGNUM) ? builtin_type_double : builtin_type_long;
1700 s390_store_struct_return (CORE_ADDR addr, CORE_ADDR sp)
1702 write_register (S390_GP0_REGNUM + 2, addr);
1707 static const unsigned char *
1708 s390_breakpoint_from_pc (CORE_ADDR *pcptr, int *lenptr)
1710 static unsigned char breakpoint[] = { 0x0, 0x1 };
1712 *lenptr = sizeof (breakpoint);
1716 /* Advance PC across any function entry prologue instructions to reach some
1719 s390_skip_prologue (CORE_ADDR pc)
1721 struct frame_extra_info fextra_info;
1723 s390_get_frame_info (pc, &fextra_info, NULL, 1);
1724 return fextra_info.skip_prologue_function_start;
1727 /* Immediately after a function call, return the saved pc.
1728 Can't go through the frames for this because on some machines
1729 the new frame is not set up until the new function executes
1730 some instructions. */
1732 s390_saved_pc_after_call (struct frame_info *frame)
1734 return ADDR_BITS_REMOVE (read_register (S390_RETADDR_REGNUM));
1738 s390_addr_bits_remove (CORE_ADDR addr)
1740 return (addr) & 0x7fffffff;
1745 s390_push_return_address (CORE_ADDR pc, CORE_ADDR sp)
1747 write_register (S390_RETADDR_REGNUM, CALL_DUMMY_ADDRESS ());
1752 s390_address_class_type_flags (int byte_size, int dwarf2_addr_class)
1755 return TYPE_FLAG_ADDRESS_CLASS_1;
1761 s390_address_class_type_flags_to_name (struct gdbarch *gdbarch, int type_flags)
1763 if (type_flags & TYPE_FLAG_ADDRESS_CLASS_1)
1770 s390_address_class_name_to_type_flags (struct gdbarch *gdbarch, const char *name,
1771 int *type_flags_ptr)
1773 if (strcmp (name, "mode32") == 0)
1775 *type_flags_ptr = TYPE_FLAG_ADDRESS_CLASS_1;
1782 static struct gdbarch *
1783 s390_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
1785 static LONGEST s390_call_dummy_words[] = { 0 };
1786 struct gdbarch *gdbarch;
1787 struct gdbarch_tdep *tdep;
1790 /* First see if there is already a gdbarch that can satisfy the request. */
1791 arches = gdbarch_list_lookup_by_info (arches, &info);
1793 return arches->gdbarch;
1795 /* None found: is the request for a s390 architecture? */
1796 if (info.bfd_arch_info->arch != bfd_arch_s390)
1797 return NULL; /* No; then it's not for us. */
1799 /* Yes: create a new gdbarch for the specified machine type. */
1800 gdbarch = gdbarch_alloc (&info, NULL);
1802 /* NOTE: cagney/2002-12-06: This can be deleted when this arch is
1803 ready to unwind the PC first (see frame.c:get_prev_frame()). */
1804 set_gdbarch_deprecated_init_frame_pc (gdbarch, init_frame_pc_default);
1806 set_gdbarch_believe_pcc_promotion (gdbarch, 0);
1807 set_gdbarch_char_signed (gdbarch, 0);
1809 set_gdbarch_frame_args_skip (gdbarch, 0);
1810 set_gdbarch_deprecated_frame_chain (gdbarch, s390_frame_chain);
1811 set_gdbarch_deprecated_frame_init_saved_regs (gdbarch, s390_frame_init_saved_regs);
1812 set_gdbarch_deprecated_store_struct_return (gdbarch, s390_store_struct_return);
1813 set_gdbarch_deprecated_extract_return_value (gdbarch, s390_extract_return_value);
1814 set_gdbarch_deprecated_store_return_value (gdbarch, s390_store_return_value);
1815 /* Amount PC must be decremented by after a breakpoint. This is
1816 often the number of bytes returned by BREAKPOINT_FROM_PC but not
1818 set_gdbarch_decr_pc_after_break (gdbarch, 2);
1819 set_gdbarch_deprecated_pop_frame (gdbarch, s390_pop_frame);
1820 /* Stack grows downward. */
1821 set_gdbarch_inner_than (gdbarch, core_addr_lessthan);
1822 /* Offset from address of function to start of its code.
1823 Zero on most machines. */
1824 set_gdbarch_function_start_offset (gdbarch, 0);
1825 set_gdbarch_deprecated_max_register_raw_size (gdbarch, 8);
1826 set_gdbarch_deprecated_max_register_virtual_size (gdbarch, 8);
1827 set_gdbarch_breakpoint_from_pc (gdbarch, s390_breakpoint_from_pc);
1828 set_gdbarch_skip_prologue (gdbarch, s390_skip_prologue);
1829 set_gdbarch_deprecated_init_extra_frame_info (gdbarch, s390_init_extra_frame_info);
1830 set_gdbarch_deprecated_init_frame_pc_first (gdbarch, s390_init_frame_pc_first);
1831 set_gdbarch_deprecated_target_read_fp (gdbarch, s390_read_fp);
1832 /* This function that tells us whether the function invocation represented
1833 by FI does not have a frame on the stack associated with it. If it
1834 does not, FRAMELESS is set to 1, else 0. */
1835 set_gdbarch_frameless_function_invocation (gdbarch,
1836 s390_frameless_function_invocation);
1837 /* Return saved PC from a frame */
1838 set_gdbarch_deprecated_frame_saved_pc (gdbarch, s390_frame_saved_pc);
1839 /* DEPRECATED_FRAME_CHAIN takes a frame's nominal address and
1840 produces the frame's chain-pointer. */
1841 set_gdbarch_deprecated_frame_chain (gdbarch, s390_frame_chain);
1842 set_gdbarch_deprecated_saved_pc_after_call (gdbarch, s390_saved_pc_after_call);
1843 set_gdbarch_register_byte (gdbarch, s390_register_byte);
1844 set_gdbarch_pc_regnum (gdbarch, S390_PC_REGNUM);
1845 set_gdbarch_sp_regnum (gdbarch, S390_SP_REGNUM);
1846 set_gdbarch_deprecated_fp_regnum (gdbarch, S390_FP_REGNUM);
1847 set_gdbarch_fp0_regnum (gdbarch, S390_FP0_REGNUM);
1848 set_gdbarch_num_regs (gdbarch, S390_NUM_REGS);
1849 set_gdbarch_cannot_fetch_register (gdbarch, s390_cannot_fetch_register);
1850 set_gdbarch_cannot_store_register (gdbarch, s390_cannot_fetch_register);
1851 set_gdbarch_use_struct_convention (gdbarch, s390_use_struct_convention);
1852 set_gdbarch_register_name (gdbarch, s390_register_name);
1853 set_gdbarch_stab_reg_to_regnum (gdbarch, s390_stab_reg_to_regnum);
1854 set_gdbarch_dwarf_reg_to_regnum (gdbarch, s390_stab_reg_to_regnum);
1855 set_gdbarch_dwarf2_reg_to_regnum (gdbarch, s390_stab_reg_to_regnum);
1856 set_gdbarch_deprecated_extract_struct_value_address
1857 (gdbarch, generic_cannot_extract_struct_value_address);
1859 /* Parameters for inferior function calls. */
1860 set_gdbarch_deprecated_pc_in_call_dummy (gdbarch, deprecated_pc_in_call_dummy_at_entry_point);
1861 set_gdbarch_frame_align (gdbarch, s390_frame_align);
1862 set_gdbarch_deprecated_push_arguments (gdbarch, s390_push_arguments);
1863 set_gdbarch_save_dummy_frame_tos (gdbarch, generic_save_dummy_frame_tos);
1864 set_gdbarch_deprecated_push_return_address (gdbarch,
1865 s390_push_return_address);
1866 set_gdbarch_deprecated_sizeof_call_dummy_words (gdbarch, sizeof (s390_call_dummy_words));
1867 set_gdbarch_deprecated_call_dummy_words (gdbarch, s390_call_dummy_words);
1869 switch (info.bfd_arch_info->mach)
1871 case bfd_mach_s390_31:
1872 set_gdbarch_deprecated_register_size (gdbarch, 4);
1873 set_gdbarch_register_raw_size (gdbarch, s390_register_raw_size);
1874 set_gdbarch_register_virtual_size (gdbarch, s390_register_raw_size);
1875 set_gdbarch_register_virtual_type (gdbarch, s390_register_virtual_type);
1877 set_gdbarch_addr_bits_remove (gdbarch, s390_addr_bits_remove);
1878 set_gdbarch_deprecated_register_bytes (gdbarch, S390_REGISTER_BYTES);
1880 case bfd_mach_s390_64:
1881 set_gdbarch_deprecated_register_size (gdbarch, 8);
1882 set_gdbarch_register_raw_size (gdbarch, s390x_register_raw_size);
1883 set_gdbarch_register_virtual_size (gdbarch, s390x_register_raw_size);
1884 set_gdbarch_register_virtual_type (gdbarch,
1885 s390x_register_virtual_type);
1887 set_gdbarch_long_bit (gdbarch, 64);
1888 set_gdbarch_long_long_bit (gdbarch, 64);
1889 set_gdbarch_ptr_bit (gdbarch, 64);
1890 set_gdbarch_deprecated_register_bytes (gdbarch, S390X_REGISTER_BYTES);
1891 set_gdbarch_address_class_type_flags (gdbarch,
1892 s390_address_class_type_flags);
1893 set_gdbarch_address_class_type_flags_to_name (gdbarch,
1894 s390_address_class_type_flags_to_name);
1895 set_gdbarch_address_class_name_to_type_flags (gdbarch,
1896 s390_address_class_name_to_type_flags);
1900 /* Should be using push_dummy_call. */
1901 set_gdbarch_deprecated_dummy_write_sp (gdbarch, deprecated_write_sp);
1908 extern initialize_file_ftype _initialize_s390_tdep; /* -Wmissing-prototypes */
1911 _initialize_s390_tdep (void)
1914 /* Hook us into the gdbarch mechanism. */
1915 register_gdbarch_init (bfd_arch_s390, s390_gdbarch_init);
1916 if (!deprecated_tm_print_insn) /* Someone may have already set it */
1917 deprecated_tm_print_insn = gdb_print_insn_s390;
1920 #endif /* GDBSERVER */