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
= dis_asm_read_memory
;
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_next_frame (fi
)->extra_info
321 && get_next_frame (fi
)->extra_info
->sigcontext
)
323 /* We are backtracing from a signal handler */
324 save_reg_addr
= get_next_frame (fi
)->extra_info
->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_next_frame (fi
)->extra_info
->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
= dis_asm_read_memory
;
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 (fi
->extra_info
&& fi
->extra_info
->initialised
)
776 function_start
= fi
->extra_info
->function_start
;
777 else if (get_frame_pc (fi
))
778 function_start
= get_pc_function_start (get_frame_pc (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 */
794 fextra_info_ptr
= fi
->extra_info
;
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
= dis_asm_read_memory
;
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 fi
->extra_info
, fi
, 1);
912 s390_memset_extra_info (fi
->extra_info
);
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
= (fi
->extra_info
&& fi
->extra_info
->initialised
932 && fi
->extra_info
->good_prologue
);
933 s390_get_frame_info (quick
? fi
->extra_info
->function_start
:
934 s390_sniff_pc_function_start (get_frame_pc (fi
), fi
),
935 fi
->extra_info
, fi
, !quick
);
943 s390_frame_args_address (struct frame_info
*fi
)
946 /* Apparently gdb already knows gdb_args_offset itself */
947 return get_frame_base (fi
);
952 s390_frame_saved_pc_nofix (struct frame_info
*fi
)
954 if (fi
->extra_info
&& fi
->extra_info
->saved_pc_valid
)
955 return fi
->extra_info
->saved_pc
;
957 if (deprecated_generic_find_dummy_frame (get_frame_pc (fi
),
958 get_frame_base (fi
)))
959 return deprecated_read_register_dummy (get_frame_pc (fi
),
960 get_frame_base (fi
), S390_PC_REGNUM
);
962 s390_frame_init_saved_regs (fi
);
965 fi
->extra_info
->saved_pc_valid
= 1;
966 if (fi
->extra_info
->good_prologue
967 && get_frame_saved_regs (fi
)[S390_RETADDR_REGNUM
])
968 fi
->extra_info
->saved_pc
969 = ADDR_BITS_REMOVE (read_memory_integer
970 (get_frame_saved_regs (fi
)[S390_RETADDR_REGNUM
],
973 fi
->extra_info
->saved_pc
974 = ADDR_BITS_REMOVE (read_register (S390_RETADDR_REGNUM
));
975 return fi
->extra_info
->saved_pc
;
981 s390_frame_saved_pc (struct frame_info
*fi
)
983 CORE_ADDR saved_pc
= 0, sig_pc
;
985 if (fi
->extra_info
&& fi
->extra_info
->sig_fixed_saved_pc_valid
)
986 return fi
->extra_info
->sig_fixed_saved_pc
;
987 saved_pc
= s390_frame_saved_pc_nofix (fi
);
991 fi
->extra_info
->sig_fixed_saved_pc_valid
= 1;
994 if (s390_is_sigreturn (saved_pc
, fi
, NULL
, &sig_pc
))
997 fi
->extra_info
->sig_fixed_saved_pc
= saved_pc
;
1005 /* We want backtraces out of signal handlers so we don't set
1006 (get_frame_type (thisframe) == SIGTRAMP_FRAME) to 1 */
1009 s390_frame_chain (struct frame_info
*thisframe
)
1011 CORE_ADDR prev_fp
= 0;
1013 if (deprecated_generic_find_dummy_frame (get_frame_pc (thisframe
),
1014 get_frame_base (thisframe
)))
1015 return deprecated_read_register_dummy (get_frame_pc (thisframe
),
1016 get_frame_base (thisframe
),
1021 CORE_ADDR sregs
= 0;
1022 struct frame_extra_info prev_fextra_info
;
1024 memset (&prev_fextra_info
, 0, sizeof (prev_fextra_info
));
1025 if (get_frame_pc (thisframe
))
1027 CORE_ADDR saved_pc
, sig_pc
;
1029 saved_pc
= s390_frame_saved_pc_nofix (thisframe
);
1033 s390_is_sigreturn (saved_pc
, thisframe
, &sregs
, &sig_pc
)))
1035 s390_get_frame_info (s390_sniff_pc_function_start
1036 (saved_pc
, NULL
), &prev_fextra_info
, NULL
,
1042 /* read sigregs,regs.gprs[11 or 15] */
1043 prev_fp
= read_memory_integer (sregs
+
1044 REGISTER_BYTE (S390_GP0_REGNUM
+
1046 frame_pointer_saved_pc
1049 thisframe
->extra_info
->sigcontext
= sregs
;
1053 if (get_frame_saved_regs (thisframe
))
1057 if (prev_fextra_info
.frame_pointer_saved_pc
1058 && get_frame_saved_regs (thisframe
)[S390_FRAME_REGNUM
])
1059 regno
= S390_FRAME_REGNUM
;
1061 regno
= S390_SP_REGNUM
;
1063 if (get_frame_saved_regs (thisframe
)[regno
])
1065 /* The SP's entry of `saved_regs' is special. */
1066 if (regno
== S390_SP_REGNUM
)
1067 prev_fp
= get_frame_saved_regs (thisframe
)[regno
];
1070 read_memory_integer (get_frame_saved_regs (thisframe
)[regno
],
1076 return ADDR_BITS_REMOVE (prev_fp
);
1080 Whether struct frame_extra_info is actually needed I'll have to figure
1081 out as our frames are similar to rs6000 there is a possibility
1082 i386 dosen't need it. */
1086 /* a given return value in `regbuf' with a type `valtype', extract and copy its
1087 value into `valbuf' */
1089 s390_extract_return_value (struct type
*valtype
, char *regbuf
, char *valbuf
)
1091 /* floats and doubles are returned in fpr0. fpr's have a size of 8 bytes.
1092 We need to truncate the return value into float size (4 byte) if
1094 int len
= TYPE_LENGTH (valtype
);
1096 if (TYPE_CODE (valtype
) == TYPE_CODE_FLT
)
1097 memcpy (valbuf
, ®buf
[REGISTER_BYTE (S390_FP0_REGNUM
)], len
);
1101 /* return value is copied starting from r2. */
1102 if (TYPE_LENGTH (valtype
) < S390_GPR_SIZE
)
1103 offset
= S390_GPR_SIZE
- TYPE_LENGTH (valtype
);
1105 regbuf
+ REGISTER_BYTE (S390_GP0_REGNUM
+ 2) + offset
,
1106 TYPE_LENGTH (valtype
));
1112 s390_promote_integer_argument (struct type
*valtype
, char *valbuf
,
1113 char *reg_buff
, int *arglen
)
1115 char *value
= valbuf
;
1116 int len
= TYPE_LENGTH (valtype
);
1118 if (len
< S390_GPR_SIZE
)
1120 /* We need to upgrade this value to a register to pass it correctly */
1121 int idx
, diff
= S390_GPR_SIZE
- len
, negative
=
1122 (!TYPE_UNSIGNED (valtype
) && value
[0] & 0x80);
1123 for (idx
= 0; idx
< S390_GPR_SIZE
; idx
++)
1125 reg_buff
[idx
] = (idx
< diff
? (negative
? 0xff : 0x0) :
1129 *arglen
= S390_GPR_SIZE
;
1133 if (len
& (S390_GPR_SIZE
- 1))
1135 fprintf_unfiltered (gdb_stderr
,
1136 "s390_promote_integer_argument detected an argument not "
1137 "a multiple of S390_GPR_SIZE & greater than S390_GPR_SIZE "
1138 "we might not deal with this correctly.\n");
1147 s390_store_return_value (struct type
*valtype
, char *valbuf
)
1150 char *reg_buff
= alloca (max (S390_FPR_SIZE
, REGISTER_SIZE
)), *value
;
1152 if (TYPE_CODE (valtype
) == TYPE_CODE_FLT
)
1154 if (TYPE_LENGTH (valtype
) == 4
1155 || TYPE_LENGTH (valtype
) == 8)
1156 deprecated_write_register_bytes (REGISTER_BYTE (S390_FP0_REGNUM
),
1157 valbuf
, TYPE_LENGTH (valtype
));
1159 error ("GDB is unable to return `long double' values "
1160 "on this architecture.");
1165 s390_promote_integer_argument (valtype
, valbuf
, reg_buff
, &arglen
);
1166 /* Everything else is returned in GPR2 and up. */
1167 deprecated_write_register_bytes (REGISTER_BYTE (S390_GP0_REGNUM
+ 2),
1172 gdb_print_insn_s390 (bfd_vma memaddr
, disassemble_info
* info
)
1174 bfd_byte instrbuff
[S390_MAX_INSTR_SIZE
];
1177 instrlen
= s390_readinstruction (instrbuff
, (CORE_ADDR
) memaddr
, info
);
1180 (*info
->memory_error_func
) (instrlen
, memaddr
, info
);
1183 for (cnt
= 0; cnt
< instrlen
; cnt
++)
1184 info
->fprintf_func (info
->stream
, "%02X ", instrbuff
[cnt
]);
1185 for (cnt
= instrlen
; cnt
< S390_MAX_INSTR_SIZE
; cnt
++)
1186 info
->fprintf_func (info
->stream
, " ");
1187 instrlen
= print_insn_s390 (memaddr
, info
);
1193 /* Not the most efficent code in the world */
1195 s390_fp_regnum (void)
1197 int regno
= S390_SP_REGNUM
;
1198 struct frame_extra_info fextra_info
;
1200 CORE_ADDR pc
= ADDR_BITS_REMOVE (read_register (S390_PC_REGNUM
));
1202 s390_get_frame_info (s390_sniff_pc_function_start (pc
, NULL
), &fextra_info
,
1204 if (fextra_info
.frame_pointer_saved_pc
)
1205 regno
= S390_FRAME_REGNUM
;
1212 return read_register (s390_fp_regnum ());
1217 s390_pop_frame_regular (struct frame_info
*frame
)
1221 write_register (S390_PC_REGNUM
, FRAME_SAVED_PC (frame
));
1223 /* Restore any saved registers. */
1224 if (get_frame_saved_regs (frame
))
1226 for (regnum
= 0; regnum
< NUM_REGS
; regnum
++)
1227 if (get_frame_saved_regs (frame
)[regnum
] != 0)
1231 value
= read_memory_unsigned_integer (get_frame_saved_regs (frame
)[regnum
],
1232 REGISTER_RAW_SIZE (regnum
));
1233 write_register (regnum
, value
);
1236 /* Actually cut back the stack. Remember that the SP's element of
1237 saved_regs is the old SP itself, not the address at which it is
1239 write_register (S390_SP_REGNUM
, get_frame_saved_regs (frame
)[S390_SP_REGNUM
]);
1242 /* Throw away any cached frame information. */
1243 flush_cached_frames ();
1247 /* Destroy the innermost (Top-Of-Stack) stack frame, restoring the
1248 machine state that was in effect before the frame was created.
1249 Used in the contexts of the "return" command, and of
1250 target function calls from the debugger. */
1252 s390_pop_frame (void)
1254 /* This function checks for and handles generic dummy frames, and
1255 calls back to our function for ordinary frames. */
1256 generic_pop_current_frame (s390_pop_frame_regular
);
1260 /* Return non-zero if TYPE is an integer-like type, zero otherwise.
1261 "Integer-like" types are those that should be passed the way
1262 integers are: integers, enums, ranges, characters, and booleans. */
1264 is_integer_like (struct type
*type
)
1266 enum type_code code
= TYPE_CODE (type
);
1268 return (code
== TYPE_CODE_INT
1269 || code
== TYPE_CODE_ENUM
1270 || code
== TYPE_CODE_RANGE
1271 || code
== TYPE_CODE_CHAR
1272 || code
== TYPE_CODE_BOOL
);
1276 /* Return non-zero if TYPE is a pointer-like type, zero otherwise.
1277 "Pointer-like" types are those that should be passed the way
1278 pointers are: pointers and references. */
1280 is_pointer_like (struct type
*type
)
1282 enum type_code code
= TYPE_CODE (type
);
1284 return (code
== TYPE_CODE_PTR
1285 || code
== TYPE_CODE_REF
);
1289 /* Return non-zero if TYPE is a `float singleton' or `double
1290 singleton', zero otherwise.
1292 A `T singleton' is a struct type with one member, whose type is
1293 either T or a `T singleton'. So, the following are all float
1297 struct { struct { float x; } x; };
1298 struct { struct { struct { float x; } x; } x; };
1302 WHY THE HECK DO WE CARE ABOUT THIS??? Well, it turns out that GCC
1303 passes all float singletons and double singletons as if they were
1304 simply floats or doubles. This is *not* what the ABI says it
1307 is_float_singleton (struct type
*type
)
1309 return (TYPE_CODE (type
) == TYPE_CODE_STRUCT
1310 && TYPE_NFIELDS (type
) == 1
1311 && (TYPE_CODE (TYPE_FIELD_TYPE (type
, 0)) == TYPE_CODE_FLT
1312 || is_float_singleton (TYPE_FIELD_TYPE (type
, 0))));
1316 /* Return non-zero if TYPE is a struct-like type, zero otherwise.
1317 "Struct-like" types are those that should be passed as structs are:
1320 As an odd quirk, not mentioned in the ABI, GCC passes float and
1321 double singletons as if they were a plain float, double, etc. (The
1322 corresponding union types are handled normally.) So we exclude
1323 those types here. *shrug* */
1325 is_struct_like (struct type
*type
)
1327 enum type_code code
= TYPE_CODE (type
);
1329 return (code
== TYPE_CODE_UNION
1330 || (code
== TYPE_CODE_STRUCT
&& ! is_float_singleton (type
)));
1334 /* Return non-zero if TYPE is a float-like type, zero otherwise.
1335 "Float-like" types are those that should be passed as
1336 floating-point values are.
1338 You'd think this would just be floats, doubles, long doubles, etc.
1339 But as an odd quirk, not mentioned in the ABI, GCC passes float and
1340 double singletons as if they were a plain float, double, etc. (The
1341 corresponding union types are handled normally.) So we exclude
1342 those types here. *shrug* */
1344 is_float_like (struct type
*type
)
1346 return (TYPE_CODE (type
) == TYPE_CODE_FLT
1347 || is_float_singleton (type
));
1351 /* Return non-zero if TYPE is considered a `DOUBLE_OR_FLOAT', as
1352 defined by the parameter passing conventions described in the
1353 "GNU/Linux for S/390 ELF Application Binary Interface Supplement".
1354 Otherwise, return zero. */
1356 is_double_or_float (struct type
*type
)
1358 return (is_float_like (type
)
1359 && (TYPE_LENGTH (type
) == 4
1360 || TYPE_LENGTH (type
) == 8));
1364 /* Return non-zero if TYPE is considered a `SIMPLE_ARG', as defined by
1365 the parameter passing conventions described in the "GNU/Linux for
1366 S/390 ELF Application Binary Interface Supplement". Return zero
1369 is_simple_arg (struct type
*type
)
1371 unsigned length
= TYPE_LENGTH (type
);
1373 /* This is almost a direct translation of the ABI's language, except
1374 that we have to exclude 8-byte structs; those are DOUBLE_ARGs. */
1375 return ((is_integer_like (type
) && length
<= 4)
1376 || is_pointer_like (type
)
1377 || (is_struct_like (type
) && length
!= 8)
1378 || (is_float_like (type
) && length
== 16));
1382 /* Return non-zero if TYPE should be passed as a pointer to a copy,
1383 zero otherwise. TYPE must be a SIMPLE_ARG, as recognized by
1386 pass_by_copy_ref (struct type
*type
)
1388 unsigned length
= TYPE_LENGTH (type
);
1390 return ((is_struct_like (type
) && length
!= 1 && length
!= 2 && length
!= 4)
1391 || (is_float_like (type
) && length
== 16));
1395 /* Return ARG, a `SIMPLE_ARG', sign-extended or zero-extended to a full
1396 word as required for the ABI. */
1398 extend_simple_arg (struct value
*arg
)
1400 struct type
*type
= VALUE_TYPE (arg
);
1402 /* Even structs get passed in the least significant bits of the
1403 register / memory word. It's not really right to extract them as
1404 an integer, but it does take care of the extension. */
1405 if (TYPE_UNSIGNED (type
))
1406 return extract_unsigned_integer (VALUE_CONTENTS (arg
),
1407 TYPE_LENGTH (type
));
1409 return extract_signed_integer (VALUE_CONTENTS (arg
),
1410 TYPE_LENGTH (type
));
1414 /* Return non-zero if TYPE is a `DOUBLE_ARG', as defined by the
1415 parameter passing conventions described in the "GNU/Linux for S/390
1416 ELF Application Binary Interface Supplement". Return zero
1419 is_double_arg (struct type
*type
)
1421 unsigned length
= TYPE_LENGTH (type
);
1423 return ((is_integer_like (type
)
1424 || is_struct_like (type
))
1429 /* Round ADDR up to the next N-byte boundary. N must be a power of
1432 round_up (CORE_ADDR addr
, int n
)
1434 /* Check that N is really a power of two. */
1435 gdb_assert (n
&& (n
& (n
-1)) == 0);
1436 return ((addr
+ n
- 1) & -n
);
1440 /* Round ADDR down to the next N-byte boundary. N must be a power of
1443 round_down (CORE_ADDR addr
, int n
)
1445 /* Check that N is really a power of two. */
1446 gdb_assert (n
&& (n
& (n
-1)) == 0);
1451 /* Return the alignment required by TYPE. */
1453 alignment_of (struct type
*type
)
1457 if (is_integer_like (type
)
1458 || is_pointer_like (type
)
1459 || TYPE_CODE (type
) == TYPE_CODE_FLT
)
1460 alignment
= TYPE_LENGTH (type
);
1461 else if (TYPE_CODE (type
) == TYPE_CODE_STRUCT
1462 || TYPE_CODE (type
) == TYPE_CODE_UNION
)
1467 for (i
= 0; i
< TYPE_NFIELDS (type
); i
++)
1469 int field_alignment
= alignment_of (TYPE_FIELD_TYPE (type
, i
));
1471 if (field_alignment
> alignment
)
1472 alignment
= field_alignment
;
1478 /* Check that everything we ever return is a power of two. Lots of
1479 code doesn't want to deal with aligning things to arbitrary
1481 gdb_assert ((alignment
& (alignment
- 1)) == 0);
1487 /* Put the actual parameter values pointed to by ARGS[0..NARGS-1] in
1488 place to be passed to a function, as specified by the "GNU/Linux
1489 for S/390 ELF Application Binary Interface Supplement".
1491 SP is the current stack pointer. We must put arguments, links,
1492 padding, etc. whereever they belong, and return the new stack
1495 If STRUCT_RETURN is non-zero, then the function we're calling is
1496 going to return a structure by value; STRUCT_ADDR is the address of
1497 a block we've allocated for it on the stack.
1499 Our caller has taken care of any type promotions needed to satisfy
1500 prototypes or the old K&R argument-passing rules. */
1502 s390_push_arguments (int nargs
, struct value
**args
, CORE_ADDR sp
,
1503 int struct_return
, CORE_ADDR struct_addr
)
1506 int pointer_size
= (TARGET_PTR_BIT
/ TARGET_CHAR_BIT
);
1508 /* The number of arguments passed by reference-to-copy. */
1511 /* If the i'th argument is passed as a reference to a copy, then
1512 copy_addr[i] is the address of the copy we made. */
1513 CORE_ADDR
*copy_addr
= alloca (nargs
* sizeof (CORE_ADDR
));
1515 /* Build the reference-to-copy area. */
1517 for (i
= 0; i
< nargs
; i
++)
1519 struct value
*arg
= args
[i
];
1520 struct type
*type
= VALUE_TYPE (arg
);
1521 unsigned length
= TYPE_LENGTH (type
);
1523 if (is_simple_arg (type
)
1524 && pass_by_copy_ref (type
))
1527 sp
= round_down (sp
, alignment_of (type
));
1528 write_memory (sp
, VALUE_CONTENTS (arg
), length
);
1534 /* Reserve space for the parameter area. As a conservative
1535 simplification, we assume that everything will be passed on the
1540 for (i
= 0; i
< nargs
; i
++)
1542 struct value
*arg
= args
[i
];
1543 struct type
*type
= VALUE_TYPE (arg
);
1544 int length
= TYPE_LENGTH (type
);
1546 sp
= round_down (sp
, alignment_of (type
));
1548 /* SIMPLE_ARG values get extended to 32 bits. Assume every
1550 if (length
< 4) length
= 4;
1555 /* Include space for any reference-to-copy pointers. */
1556 sp
= round_down (sp
, pointer_size
);
1557 sp
-= num_copies
* pointer_size
;
1559 /* After all that, make sure it's still aligned on an eight-byte
1561 sp
= round_down (sp
, 8);
1563 /* Finally, place the actual parameters, working from SP towards
1564 higher addresses. The code above is supposed to reserve enough
1569 CORE_ADDR starg
= sp
;
1571 for (i
= 0; i
< nargs
; i
++)
1573 struct value
*arg
= args
[i
];
1574 struct type
*type
= VALUE_TYPE (arg
);
1576 if (is_double_or_float (type
)
1579 /* When we store a single-precision value in an FP register,
1580 it occupies the leftmost bits. */
1581 deprecated_write_register_bytes (REGISTER_BYTE (S390_FP0_REGNUM
+ fr
),
1582 VALUE_CONTENTS (arg
),
1583 TYPE_LENGTH (type
));
1586 else if (is_simple_arg (type
)
1589 /* Do we need to pass a pointer to our copy of this
1591 if (pass_by_copy_ref (type
))
1592 write_register (S390_GP0_REGNUM
+ gr
, copy_addr
[i
]);
1594 write_register (S390_GP0_REGNUM
+ gr
, extend_simple_arg (arg
));
1598 else if (is_double_arg (type
)
1601 deprecated_write_register_gen (S390_GP0_REGNUM
+ gr
,
1602 VALUE_CONTENTS (arg
));
1603 deprecated_write_register_gen (S390_GP0_REGNUM
+ gr
+ 1,
1604 VALUE_CONTENTS (arg
) + 4);
1609 /* The `OTHER' case. */
1610 enum type_code code
= TYPE_CODE (type
);
1611 unsigned length
= TYPE_LENGTH (type
);
1613 /* If we skipped r6 because we couldn't fit a DOUBLE_ARG
1614 in it, then don't go back and use it again later. */
1615 if (is_double_arg (type
) && gr
== 6)
1618 if (is_simple_arg (type
))
1620 /* Simple args are always either extended to 32 bits,
1622 starg
= round_up (starg
, 4);
1624 /* Do we need to pass a pointer to our copy of this
1626 if (pass_by_copy_ref (type
))
1627 write_memory_signed_integer (starg
, pointer_size
,
1630 /* Simple args are always extended to 32 bits. */
1631 write_memory_signed_integer (starg
, 4,
1632 extend_simple_arg (arg
));
1637 /* You'd think we should say:
1638 starg = round_up (starg, alignment_of (type));
1639 Unfortunately, GCC seems to simply align the stack on
1640 a four-byte boundary, even when passing doubles. */
1641 starg
= round_up (starg
, 4);
1642 write_memory (starg
, VALUE_CONTENTS (arg
), length
);
1649 /* Allocate the standard frame areas: the register save area, the
1650 word reserved for the compiler (which seems kind of meaningless),
1651 and the back chain pointer. */
1654 /* Write the back chain pointer into the first word of the stack
1655 frame. This will help us get backtraces from within functions
1657 write_memory_unsigned_integer (sp
, (TARGET_PTR_BIT
/ TARGET_CHAR_BIT
),
1665 s390_use_struct_convention (int gcc_p
, struct type
*value_type
)
1667 enum type_code code
= TYPE_CODE (value_type
);
1669 return (code
== TYPE_CODE_STRUCT
1670 || code
== TYPE_CODE_UNION
);
1674 /* Return the GDB type object for the "standard" data type
1675 of data in register N. */
1677 s390_register_virtual_type (int regno
)
1679 if (S390_FP0_REGNUM
<= regno
&& regno
< S390_FP0_REGNUM
+ S390_NUM_FPRS
)
1680 return builtin_type_double
;
1682 return builtin_type_int
;
1687 s390x_register_virtual_type (int regno
)
1689 return (regno
== S390_FPC_REGNUM
) ||
1690 (regno
>= S390_FIRST_ACR
&& regno
<= S390_LAST_ACR
) ? builtin_type_int
:
1691 (regno
>= S390_FP0_REGNUM
) ? builtin_type_double
: builtin_type_long
;
1697 s390_store_struct_return (CORE_ADDR addr
, CORE_ADDR sp
)
1699 write_register (S390_GP0_REGNUM
+ 2, addr
);
1704 const static unsigned char *
1705 s390_breakpoint_from_pc (CORE_ADDR
*pcptr
, int *lenptr
)
1707 static unsigned char breakpoint
[] = { 0x0, 0x1 };
1709 *lenptr
= sizeof (breakpoint
);
1713 /* Advance PC across any function entry prologue instructions to reach some
1716 s390_skip_prologue (CORE_ADDR pc
)
1718 struct frame_extra_info fextra_info
;
1720 s390_get_frame_info (pc
, &fextra_info
, NULL
, 1);
1721 return fextra_info
.skip_prologue_function_start
;
1724 /* Immediately after a function call, return the saved pc.
1725 Can't go through the frames for this because on some machines
1726 the new frame is not set up until the new function executes
1727 some instructions. */
1729 s390_saved_pc_after_call (struct frame_info
*frame
)
1731 return ADDR_BITS_REMOVE (read_register (S390_RETADDR_REGNUM
));
1735 s390_addr_bits_remove (CORE_ADDR addr
)
1737 return (addr
) & 0x7fffffff;
1742 s390_push_return_address (CORE_ADDR pc
, CORE_ADDR sp
)
1744 write_register (S390_RETADDR_REGNUM
, CALL_DUMMY_ADDRESS ());
1749 s390_gdbarch_init (struct gdbarch_info info
, struct gdbarch_list
*arches
)
1751 static LONGEST s390_call_dummy_words
[] = { 0 };
1752 struct gdbarch
*gdbarch
;
1753 struct gdbarch_tdep
*tdep
;
1756 /* First see if there is already a gdbarch that can satisfy the request. */
1757 arches
= gdbarch_list_lookup_by_info (arches
, &info
);
1759 return arches
->gdbarch
;
1761 /* None found: is the request for a s390 architecture? */
1762 if (info
.bfd_arch_info
->arch
!= bfd_arch_s390
)
1763 return NULL
; /* No; then it's not for us. */
1765 /* Yes: create a new gdbarch for the specified machine type. */
1766 gdbarch
= gdbarch_alloc (&info
, NULL
);
1768 /* NOTE: cagney/2002-12-06: This can be deleted when this arch is
1769 ready to unwind the PC first (see frame.c:get_prev_frame()). */
1770 set_gdbarch_deprecated_init_frame_pc (gdbarch
, init_frame_pc_default
);
1772 set_gdbarch_believe_pcc_promotion (gdbarch
, 0);
1773 set_gdbarch_char_signed (gdbarch
, 0);
1775 set_gdbarch_frame_args_skip (gdbarch
, 0);
1776 set_gdbarch_frame_args_address (gdbarch
, s390_frame_args_address
);
1777 set_gdbarch_frame_chain (gdbarch
, s390_frame_chain
);
1778 set_gdbarch_frame_init_saved_regs (gdbarch
, s390_frame_init_saved_regs
);
1779 set_gdbarch_frame_locals_address (gdbarch
, s390_frame_args_address
);
1780 /* We can't do this */
1781 set_gdbarch_frame_num_args (gdbarch
, frame_num_args_unknown
);
1782 set_gdbarch_store_struct_return (gdbarch
, s390_store_struct_return
);
1783 set_gdbarch_deprecated_extract_return_value (gdbarch
, s390_extract_return_value
);
1784 set_gdbarch_deprecated_store_return_value (gdbarch
, s390_store_return_value
);
1785 /* Amount PC must be decremented by after a breakpoint.
1786 This is often the number of bytes in BREAKPOINT
1788 set_gdbarch_decr_pc_after_break (gdbarch
, 2);
1789 set_gdbarch_pop_frame (gdbarch
, s390_pop_frame
);
1790 /* Stack grows downward. */
1791 set_gdbarch_inner_than (gdbarch
, core_addr_lessthan
);
1792 /* Offset from address of function to start of its code.
1793 Zero on most machines. */
1794 set_gdbarch_function_start_offset (gdbarch
, 0);
1795 set_gdbarch_max_register_raw_size (gdbarch
, 8);
1796 set_gdbarch_max_register_virtual_size (gdbarch
, 8);
1797 set_gdbarch_breakpoint_from_pc (gdbarch
, s390_breakpoint_from_pc
);
1798 set_gdbarch_skip_prologue (gdbarch
, s390_skip_prologue
);
1799 set_gdbarch_init_extra_frame_info (gdbarch
, s390_init_extra_frame_info
);
1800 set_gdbarch_deprecated_init_frame_pc_first (gdbarch
, s390_init_frame_pc_first
);
1801 set_gdbarch_read_fp (gdbarch
, s390_read_fp
);
1802 /* This function that tells us whether the function invocation represented
1803 by FI does not have a frame on the stack associated with it. If it
1804 does not, FRAMELESS is set to 1, else 0. */
1805 set_gdbarch_frameless_function_invocation (gdbarch
,
1806 s390_frameless_function_invocation
);
1807 /* Return saved PC from a frame */
1808 set_gdbarch_frame_saved_pc (gdbarch
, s390_frame_saved_pc
);
1809 /* FRAME_CHAIN takes a frame's nominal address
1810 and produces the frame's chain-pointer. */
1811 set_gdbarch_frame_chain (gdbarch
, s390_frame_chain
);
1812 set_gdbarch_saved_pc_after_call (gdbarch
, s390_saved_pc_after_call
);
1813 set_gdbarch_register_byte (gdbarch
, s390_register_byte
);
1814 set_gdbarch_pc_regnum (gdbarch
, S390_PC_REGNUM
);
1815 set_gdbarch_sp_regnum (gdbarch
, S390_SP_REGNUM
);
1816 set_gdbarch_fp_regnum (gdbarch
, S390_FP_REGNUM
);
1817 set_gdbarch_fp0_regnum (gdbarch
, S390_FP0_REGNUM
);
1818 set_gdbarch_num_regs (gdbarch
, S390_NUM_REGS
);
1819 set_gdbarch_cannot_fetch_register (gdbarch
, s390_cannot_fetch_register
);
1820 set_gdbarch_cannot_store_register (gdbarch
, s390_cannot_fetch_register
);
1821 set_gdbarch_use_struct_convention (gdbarch
, s390_use_struct_convention
);
1822 set_gdbarch_register_name (gdbarch
, s390_register_name
);
1823 set_gdbarch_stab_reg_to_regnum (gdbarch
, s390_stab_reg_to_regnum
);
1824 set_gdbarch_dwarf_reg_to_regnum (gdbarch
, s390_stab_reg_to_regnum
);
1825 set_gdbarch_dwarf2_reg_to_regnum (gdbarch
, s390_stab_reg_to_regnum
);
1826 set_gdbarch_deprecated_extract_struct_value_address
1827 (gdbarch
, generic_cannot_extract_struct_value_address
);
1829 /* Parameters for inferior function calls. */
1830 set_gdbarch_call_dummy_p (gdbarch
, 1);
1831 set_gdbarch_call_dummy_length (gdbarch
, 0);
1832 set_gdbarch_call_dummy_address (gdbarch
, entry_point_address
);
1833 set_gdbarch_call_dummy_start_offset (gdbarch
, 0);
1834 set_gdbarch_deprecated_pc_in_call_dummy (gdbarch
, deprecated_pc_in_call_dummy_at_entry_point
);
1835 set_gdbarch_push_dummy_frame (gdbarch
, generic_push_dummy_frame
);
1836 set_gdbarch_push_arguments (gdbarch
, s390_push_arguments
);
1837 set_gdbarch_save_dummy_frame_tos (gdbarch
, generic_save_dummy_frame_tos
);
1838 set_gdbarch_call_dummy_breakpoint_offset_p (gdbarch
, 1);
1839 set_gdbarch_call_dummy_breakpoint_offset (gdbarch
, 0);
1840 set_gdbarch_call_dummy_stack_adjust_p (gdbarch
, 0);
1841 set_gdbarch_fix_call_dummy (gdbarch
, generic_fix_call_dummy
);
1842 set_gdbarch_push_return_address (gdbarch
, s390_push_return_address
);
1843 set_gdbarch_sizeof_call_dummy_words (gdbarch
,
1844 sizeof (s390_call_dummy_words
));
1845 set_gdbarch_call_dummy_words (gdbarch
, s390_call_dummy_words
);
1847 switch (info
.bfd_arch_info
->mach
)
1849 case bfd_mach_s390_31
:
1850 set_gdbarch_register_size (gdbarch
, 4);
1851 set_gdbarch_register_raw_size (gdbarch
, s390_register_raw_size
);
1852 set_gdbarch_register_virtual_size (gdbarch
, s390_register_raw_size
);
1853 set_gdbarch_register_virtual_type (gdbarch
, s390_register_virtual_type
);
1855 set_gdbarch_addr_bits_remove (gdbarch
, s390_addr_bits_remove
);
1856 set_gdbarch_register_bytes (gdbarch
, S390_REGISTER_BYTES
);
1858 case bfd_mach_s390_64
:
1859 set_gdbarch_register_size (gdbarch
, 8);
1860 set_gdbarch_register_raw_size (gdbarch
, s390x_register_raw_size
);
1861 set_gdbarch_register_virtual_size (gdbarch
, s390x_register_raw_size
);
1862 set_gdbarch_register_virtual_type (gdbarch
,
1863 s390x_register_virtual_type
);
1865 set_gdbarch_long_bit (gdbarch
, 64);
1866 set_gdbarch_long_long_bit (gdbarch
, 64);
1867 set_gdbarch_ptr_bit (gdbarch
, 64);
1868 set_gdbarch_register_bytes (gdbarch
, S390X_REGISTER_BYTES
);
1878 _initialize_s390_tdep (void)
1881 /* Hook us into the gdbarch mechanism. */
1882 register_gdbarch_init (bfd_arch_s390
, s390_gdbarch_init
);
1883 if (!tm_print_insn
) /* Someone may have already set it */
1884 tm_print_insn
= gdb_print_insn_s390
;
1887 #endif /* GDBSERVER */