1 /* Machine-dependent code which would otherwise be in inflow.c and core.c,
2 for GDB, the GNU debugger. This code is for the HP PA-RISC cpu.
3 Copyright 1986, 1987, 1989, 1990, 1991, 1992, 1993 Free Software Foundation, Inc.
5 Contributed by the Center for Software Science at the
6 University of Utah (pa-gdb-bugs@cs.utah.edu).
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., 675 Mass Ave, Cambridge, MA 02139, USA. */
29 /* For argument passing to the inferior */
33 #include <sys/types.h>
36 #include <sys/param.h>
39 #include <sys/ioctl.h>
41 #ifdef COFF_ENCAPSULATE
42 #include "a.out.encap.h"
47 #define N_SET_MAGIC(exec, val) ((exec).a_magic = (val))
50 /*#include <sys/user.h> After a.out.h */
53 #include <machine/psl.h>
62 static int restore_pc_queue
PARAMS ((struct frame_saved_regs
*fsr
));
63 static int hppa_alignof
PARAMS ((struct type
*arg
));
64 CORE_ADDR frame_saved_pc
PARAMS ((FRAME frame
));
67 /* Routines to extract various sized constants out of hppa
70 /* This assumes that no garbage lies outside of the lower bits of
74 sign_extend (val
, bits
)
77 return (int)(val
>> bits
- 1 ? (-1 << bits
) | val
: val
);
80 /* For many immediate values the sign bit is the low bit! */
83 low_sign_extend (val
, bits
)
86 return (int)((val
& 0x1 ? (-1 << (bits
- 1)) : 0) | val
>> 1);
88 /* extract the immediate field from a ld{bhw}s instruction */
91 get_field (val
, from
, to
)
92 unsigned val
, from
, to
;
95 return val
& ((1 << 32 - from
) - 1);
99 set_field (val
, from
, to
, new_val
)
100 unsigned *val
, from
, to
;
102 unsigned mask
= ~((1 << (to
- from
+ 1)) << (31 - from
));
103 return *val
= *val
& mask
| (new_val
<< (31 - from
));
106 /* extract a 3-bit space register number from a be, ble, mtsp or mfsp */
111 return GET_FIELD (word
, 18, 18) << 2 | GET_FIELD (word
, 16, 17);
114 extract_5_load (word
)
117 return low_sign_extend (word
>> 16 & MASK_5
, 5);
120 /* extract the immediate field from a st{bhw}s instruction */
123 extract_5_store (word
)
126 return low_sign_extend (word
& MASK_5
, 5);
129 /* extract the immediate field from a break instruction */
132 extract_5r_store (word
)
135 return (word
& MASK_5
);
138 /* extract the immediate field from a {sr}sm instruction */
141 extract_5R_store (word
)
144 return (word
>> 16 & MASK_5
);
147 /* extract an 11 bit immediate field */
153 return low_sign_extend (word
& MASK_11
, 11);
156 /* extract a 14 bit immediate field */
162 return low_sign_extend (word
& MASK_14
, 14);
165 /* deposit a 14 bit constant in a word */
168 deposit_14 (opnd
, word
)
172 unsigned sign
= (opnd
< 0 ? 1 : 0);
174 return word
| ((unsigned)opnd
<< 1 & MASK_14
) | sign
;
177 /* extract a 21 bit constant */
187 val
= GET_FIELD (word
, 20, 20);
189 val
|= GET_FIELD (word
, 9, 19);
191 val
|= GET_FIELD (word
, 5, 6);
193 val
|= GET_FIELD (word
, 0, 4);
195 val
|= GET_FIELD (word
, 7, 8);
196 return sign_extend (val
, 21) << 11;
199 /* deposit a 21 bit constant in a word. Although 21 bit constants are
200 usually the top 21 bits of a 32 bit constant, we assume that only
201 the low 21 bits of opnd are relevant */
204 deposit_21 (opnd
, word
)
209 val
|= GET_FIELD (opnd
, 11 + 14, 11 + 18);
211 val
|= GET_FIELD (opnd
, 11 + 12, 11 + 13);
213 val
|= GET_FIELD (opnd
, 11 + 19, 11 + 20);
215 val
|= GET_FIELD (opnd
, 11 + 1, 11 + 11);
217 val
|= GET_FIELD (opnd
, 11 + 0, 11 + 0);
221 /* extract a 12 bit constant from branch instructions */
227 return sign_extend (GET_FIELD (word
, 19, 28) |
228 GET_FIELD (word
, 29, 29) << 10 |
229 (word
& 0x1) << 11, 12) << 2;
232 /* extract a 17 bit constant from branch instructions, returning the
233 19 bit signed value. */
239 return sign_extend (GET_FIELD (word
, 19, 28) |
240 GET_FIELD (word
, 29, 29) << 10 |
241 GET_FIELD (word
, 11, 15) << 11 |
242 (word
& 0x1) << 16, 17) << 2;
245 static int use_unwind
= 0;
247 /* Lookup the unwind (stack backtrace) info for the given PC. We search all
248 of the objfiles seeking the unwind table entry for this PC. Each objfile
249 contains a sorted list of struct unwind_table_entry. Since we do a binary
250 search of the unwind tables, we depend upon them to be sorted. */
252 static struct unwind_table_entry
*
253 find_unwind_entry(pc
)
256 int first
, middle
, last
;
257 struct objfile
*objfile
;
259 ALL_OBJFILES (objfile
)
261 struct obj_unwind_info
*ui
;
263 ui
= OBJ_UNWIND_INFO (objfile
);
268 /* First, check the cache */
271 && pc
>= ui
->cache
->region_start
272 && pc
<= ui
->cache
->region_end
)
275 /* Not in the cache, do a binary search */
280 while (first
<= last
)
282 middle
= (first
+ last
) / 2;
283 if (pc
>= ui
->table
[middle
].region_start
284 && pc
<= ui
->table
[middle
].region_end
)
286 ui
->cache
= &ui
->table
[middle
];
287 return &ui
->table
[middle
];
290 if (pc
< ui
->table
[middle
].region_start
)
295 } /* ALL_OBJFILES() */
300 find_return_regnum(pc
)
303 struct unwind_table_entry
*u
;
305 u
= find_unwind_entry (pc
);
317 find_proc_framesize(pc
)
320 struct unwind_table_entry
*u
;
325 u
= find_unwind_entry (pc
);
331 /* If this bit is set, it means there is a frame pointer and we should
335 return u
->Total_frame_size
<< 3;
341 struct unwind_table_entry
*u
;
343 u
= find_unwind_entry (pc
);
355 frameless_function_invocation (frame
)
361 struct unwind_table_entry
*u
;
363 u
= find_unwind_entry (frame
->pc
);
368 return (u
->Total_frame_size
== 0);
371 return frameless_look_for_prologue (frame
);
375 saved_pc_after_call (frame
)
380 ret_regnum
= find_return_regnum (get_frame_pc (frame
));
382 return read_register (ret_regnum
) & ~0x3;
386 frame_saved_pc (frame
)
389 CORE_ADDR pc
= get_frame_pc (frame
);
391 if (frameless_function_invocation (frame
))
395 ret_regnum
= find_return_regnum (pc
);
397 return read_register (ret_regnum
) & ~0x3;
399 else if (rp_saved (pc
))
400 return read_memory_integer (frame
->frame
- 20, 4) & ~0x3;
402 return read_register (RP_REGNUM
) & ~0x3;
405 /* We need to correct the PC and the FP for the outermost frame when we are
409 init_extra_frame_info (fromleaf
, frame
)
411 struct frame_info
*frame
;
416 if (frame
->next
) /* Only do this for outermost frame */
419 flags
= read_register (FLAGS_REGNUM
);
420 if (flags
& 2) /* In system call? */
421 frame
->pc
= read_register (31) & ~0x3;
423 /* The outermost frame is always derived from PC-framesize */
424 framesize
= find_proc_framesize(frame
->pc
);
426 frame
->frame
= read_register (FP_REGNUM
);
428 frame
->frame
= read_register (SP_REGNUM
) - framesize
;
430 if (!frameless_function_invocation (frame
)) /* Frameless? */
431 return; /* No, quit now */
433 /* For frameless functions, we need to look at the caller's frame */
434 framesize
= find_proc_framesize(FRAME_SAVED_PC(frame
));
436 frame
->frame
-= framesize
;
441 struct frame_info
*frame
;
445 framesize
= find_proc_framesize(FRAME_SAVED_PC(frame
));
448 return frame
->frame
- framesize
;
450 return read_memory_integer (frame
->frame
, 4);
453 /* To see if a frame chain is valid, see if the caller looks like it
454 was compiled with gcc. */
457 frame_chain_valid (chain
, thisframe
)
461 struct minimal_symbol
*msym
;
469 struct unwind_table_entry
*u
;
471 u
= find_unwind_entry (thisframe
->pc
);
473 if (u
&& (u
->Save_SP
|| u
->Total_frame_size
))
480 msym
= lookup_minimal_symbol_by_pc (FRAME_SAVED_PC (thisframe
));
483 && (strcmp (SYMBOL_NAME (msym
), "_start") == 0))
491 * These functions deal with saving and restoring register state
492 * around a function call in the inferior. They keep the stack
493 * double-word aligned; eventually, on an hp700, the stack will have
494 * to be aligned to a 64-byte boundary.
500 register CORE_ADDR sp
;
505 /* Space for "arguments"; the RP goes in here. */
506 sp
= read_register (SP_REGNUM
) + 48;
507 int_buffer
= read_register (RP_REGNUM
) | 0x3;
508 write_memory (sp
- 20, (char *)&int_buffer
, 4);
510 int_buffer
= read_register (FP_REGNUM
);
511 write_memory (sp
, (char *)&int_buffer
, 4);
513 write_register (FP_REGNUM
, sp
);
517 for (regnum
= 1; regnum
< 32; regnum
++)
518 if (regnum
!= RP_REGNUM
&& regnum
!= FP_REGNUM
)
519 sp
= push_word (sp
, read_register (regnum
));
523 for (regnum
= FP0_REGNUM
; regnum
< NUM_REGS
; regnum
++)
525 read_register_bytes (REGISTER_BYTE (regnum
), (char *)&freg_buffer
, 8);
526 sp
= push_bytes (sp
, (char *)&freg_buffer
, 8);
528 sp
= push_word (sp
, read_register (IPSW_REGNUM
));
529 sp
= push_word (sp
, read_register (SAR_REGNUM
));
530 sp
= push_word (sp
, read_register (PCOQ_HEAD_REGNUM
));
531 sp
= push_word (sp
, read_register (PCSQ_HEAD_REGNUM
));
532 sp
= push_word (sp
, read_register (PCOQ_TAIL_REGNUM
));
533 sp
= push_word (sp
, read_register (PCSQ_TAIL_REGNUM
));
534 write_register (SP_REGNUM
, sp
);
537 find_dummy_frame_regs (frame
, frame_saved_regs
)
538 struct frame_info
*frame
;
539 struct frame_saved_regs
*frame_saved_regs
;
541 CORE_ADDR fp
= frame
->frame
;
544 frame_saved_regs
->regs
[RP_REGNUM
] = fp
- 20 & ~0x3;
545 frame_saved_regs
->regs
[FP_REGNUM
] = fp
;
546 frame_saved_regs
->regs
[1] = fp
+ 8;
548 for (fp
+= 12, i
= 3; i
< 32; i
++)
552 frame_saved_regs
->regs
[i
] = fp
;
558 for (i
= FP0_REGNUM
; i
< NUM_REGS
; i
++, fp
+= 8)
559 frame_saved_regs
->regs
[i
] = fp
;
561 frame_saved_regs
->regs
[IPSW_REGNUM
] = fp
;
562 frame_saved_regs
->regs
[SAR_REGNUM
] = fp
+ 4;
563 frame_saved_regs
->regs
[PCOQ_HEAD_REGNUM
] = fp
+ 8;
564 frame_saved_regs
->regs
[PCSQ_HEAD_REGNUM
] = fp
+ 12;
565 frame_saved_regs
->regs
[PCOQ_TAIL_REGNUM
] = fp
+ 16;
566 frame_saved_regs
->regs
[PCSQ_TAIL_REGNUM
] = fp
+ 20;
572 register FRAME frame
= get_current_frame ();
573 register CORE_ADDR fp
;
575 struct frame_saved_regs fsr
;
576 struct frame_info
*fi
;
579 fi
= get_frame_info (frame
);
581 get_frame_saved_regs (fi
, &fsr
);
583 if (fsr
.regs
[IPSW_REGNUM
]) /* Restoring a call dummy frame */
584 restore_pc_queue (&fsr
);
586 for (regnum
= 31; regnum
> 0; regnum
--)
587 if (fsr
.regs
[regnum
])
588 write_register (regnum
, read_memory_integer (fsr
.regs
[regnum
], 4));
590 for (regnum
= NUM_REGS
- 1; regnum
>= FP0_REGNUM
; regnum
--)
591 if (fsr
.regs
[regnum
])
593 read_memory (fsr
.regs
[regnum
], (char *)&freg_buffer
, 8);
594 write_register_bytes (REGISTER_BYTE (regnum
), (char *)&freg_buffer
, 8);
597 if (fsr
.regs
[IPSW_REGNUM
])
598 write_register (IPSW_REGNUM
,
599 read_memory_integer (fsr
.regs
[IPSW_REGNUM
], 4));
601 if (fsr
.regs
[SAR_REGNUM
])
602 write_register (SAR_REGNUM
,
603 read_memory_integer (fsr
.regs
[SAR_REGNUM
], 4));
605 if (fsr
.regs
[PCOQ_TAIL_REGNUM
])
606 write_register (PCOQ_TAIL_REGNUM
,
607 read_memory_integer (fsr
.regs
[PCOQ_TAIL_REGNUM
], 4));
609 write_register (FP_REGNUM
, read_memory_integer (fp
, 4));
611 if (fsr
.regs
[IPSW_REGNUM
]) /* call dummy */
612 write_register (SP_REGNUM
, fp
- 48);
614 write_register (SP_REGNUM
, fp
);
616 flush_cached_frames ();
617 set_current_frame (create_new_frame (read_register (FP_REGNUM
),
622 * After returning to a dummy on the stack, restore the instruction
623 * queue space registers. */
626 restore_pc_queue (fsr
)
627 struct frame_saved_regs
*fsr
;
629 CORE_ADDR pc
= read_pc ();
630 CORE_ADDR new_pc
= read_memory_integer (fsr
->regs
[PCOQ_HEAD_REGNUM
], 4);
635 /* Advance past break instruction in the call dummy. */
636 write_register (PCOQ_HEAD_REGNUM
, pc
+ 4);
637 write_register (PCOQ_TAIL_REGNUM
, pc
+ 8);
640 * HPUX doesn't let us set the space registers or the space
641 * registers of the PC queue through ptrace. Boo, hiss.
642 * Conveniently, the call dummy has this sequence of instructions
647 * So, load up the registers and single step until we are in the
651 write_register (21, read_memory_integer (fsr
->regs
[PCSQ_HEAD_REGNUM
], 4));
652 write_register (22, new_pc
);
654 for (insn_count
= 0; insn_count
< 3; insn_count
++)
661 stop_signal
= WTERMSIG (w
);
662 terminal_ours_for_output ();
663 printf ("\nProgram terminated with signal %d, %s\n",
664 stop_signal
, safe_strsignal (stop_signal
));
669 fetch_inferior_registers (-1);
674 hppa_push_arguments (nargs
, args
, sp
, struct_return
, struct_addr
)
679 CORE_ADDR struct_addr
;
681 /* array of arguments' offsets */
682 int *offset
= (int *)alloca(nargs
* sizeof (int));
686 for (i
= 0; i
< nargs
; i
++)
688 /* Coerce chars to int & float to double if necessary */
689 args
[i
] = value_arg_coerce (args
[i
]);
691 cum
+= TYPE_LENGTH (VALUE_TYPE (args
[i
]));
693 /* value must go at proper alignment. Assume alignment is a
695 alignment
= hppa_alignof (VALUE_TYPE (args
[i
]));
697 cum
= (cum
+ alignment
) & -alignment
;
700 sp
+= max ((cum
+ 7) & -8, 16);
702 for (i
= 0; i
< nargs
; i
++)
703 write_memory (sp
+ offset
[i
], VALUE_CONTENTS (args
[i
]),
704 TYPE_LENGTH (VALUE_TYPE (args
[i
])));
707 write_register (28, struct_addr
);
712 * Insert the specified number of args and function address
713 * into a call sequence of the above form stored at DUMMYNAME.
715 * On the hppa we need to call the stack dummy through $$dyncall.
716 * Therefore our version of FIX_CALL_DUMMY takes an extra argument,
717 * real_pc, which is the location where gdb should start up the
718 * inferior to do the function call.
722 hppa_fix_call_dummy (dummy
, pc
, fun
, nargs
, args
, type
, gcc_p
)
723 REGISTER_TYPE
*dummy
;
731 CORE_ADDR dyncall_addr
, sr4export_addr
;
732 struct minimal_symbol
*msymbol
;
734 msymbol
= lookup_minimal_symbol ("$$dyncall", (struct objfile
*) NULL
);
736 error ("Can't find an address for $$dyncall trampoline");
738 dyncall_addr
= SYMBOL_VALUE_ADDRESS (msymbol
);
740 msymbol
= lookup_minimal_symbol ("_sr4export", (struct objfile
*) NULL
);
742 error ("Can't find an address for _sr4export trampoline");
744 sr4export_addr
= SYMBOL_VALUE_ADDRESS (msymbol
);
746 dummy
[9] = deposit_21 (fun
>> 11, dummy
[9]);
747 dummy
[10] = deposit_14 (fun
& MASK_11
, dummy
[10]);
748 dummy
[12] = deposit_21 (sr4export_addr
>> 11, dummy
[12]);
749 dummy
[13] = deposit_14 (sr4export_addr
& MASK_11
, dummy
[13]);
751 write_register (22, pc
);
756 /* return the alignment of a type in bytes. Structures have the maximum
757 alignment required by their fields. */
763 int max_align
, align
, i
;
764 switch (TYPE_CODE (arg
))
769 return TYPE_LENGTH (arg
);
770 case TYPE_CODE_ARRAY
:
771 return hppa_alignof (TYPE_FIELD_TYPE (arg
, 0));
772 case TYPE_CODE_STRUCT
:
773 case TYPE_CODE_UNION
:
775 for (i
= 0; i
< TYPE_NFIELDS (arg
); i
++)
777 /* Bit fields have no real alignment. */
778 if (!TYPE_FIELD_BITPOS (arg
, i
))
780 align
= hppa_alignof (TYPE_FIELD_TYPE (arg
, i
));
781 max_align
= max (max_align
, align
);
790 /* Print the register regnum, or all registers if regnum is -1 */
792 pa_do_registers_info (regnum
, fpregs
)
796 char raw_regs
[REGISTER_BYTES
];
799 for (i
= 0; i
< NUM_REGS
; i
++)
800 read_relative_register_raw_bytes (i
, raw_regs
+ REGISTER_BYTE (i
));
802 pa_print_registers (raw_regs
, regnum
, fpregs
);
803 else if (regnum
< FP0_REGNUM
)
804 printf ("%s %x\n", reg_names
[regnum
], *(long *)(raw_regs
+
805 REGISTER_BYTE (regnum
)));
807 pa_print_fp_reg (regnum
);
810 pa_print_registers (raw_regs
, regnum
, fpregs
)
817 for (i
= 0; i
< 18; i
++)
818 printf ("%8.8s: %8x %8.8s: %8x %8.8s: %8x %8.8s: %8x\n",
820 *(int *)(raw_regs
+ REGISTER_BYTE (i
)),
822 *(int *)(raw_regs
+ REGISTER_BYTE (i
+ 18)),
824 *(int *)(raw_regs
+ REGISTER_BYTE (i
+ 36)),
826 *(int *)(raw_regs
+ REGISTER_BYTE (i
+ 54)));
829 for (i
= 72; i
< NUM_REGS
; i
++)
836 unsigned char raw_buffer
[MAX_REGISTER_RAW_SIZE
];
837 unsigned char virtual_buffer
[MAX_REGISTER_VIRTUAL_SIZE
];
840 /* Get the data in raw format, then convert also to virtual format. */
841 read_relative_register_raw_bytes (i
, raw_buffer
);
842 REGISTER_CONVERT_TO_VIRTUAL (i
, raw_buffer
, virtual_buffer
);
844 fputs_filtered (reg_names
[i
], stdout
);
845 print_spaces_filtered (15 - strlen (reg_names
[i
]), stdout
);
847 val_print (REGISTER_VIRTUAL_TYPE (i
), virtual_buffer
, 0, stdout
, 0,
848 1, 0, Val_pretty_default
);
849 printf_filtered ("\n");
852 /* Function calls that pass into a new compilation unit must pass through a
853 small piece of code that does long format (`external' in HPPA parlance)
854 jumps. We figure out where the trampoline is going to end up, and return
855 the PC of the final destination. If we aren't in a trampoline, we just
858 For computed calls, we just extract the new PC from r22. */
861 skip_trampoline_code (pc
, name
)
866 static CORE_ADDR dyncall
= 0;
867 struct minimal_symbol
*msym
;
869 /* FIXME XXX - dyncall must be initialized whenever we get a new exec file */
873 msym
= lookup_minimal_symbol ("$$dyncall", NULL
);
875 dyncall
= SYMBOL_VALUE_ADDRESS (msym
);
881 return (CORE_ADDR
)(read_register (22) & ~0x3);
883 inst0
= read_memory_integer (pc
, 4);
884 inst1
= read_memory_integer (pc
+4, 4);
886 if ( (inst0
& 0xffe00000) == 0x20200000 /* ldil xxx, r1 */
887 && (inst1
& 0xffe0e002) == 0xe0202002) /* be,n yyy(sr4, r1) */
888 pc
= extract_21 (inst0
) + extract_17 (inst1
);
890 pc
= (CORE_ADDR
)NULL
;
895 /* Advance PC across any function entry prologue instructions
896 to reach some "real" code. */
898 /* skip (stw rp, -20(0,sp)); copy 4,1; copy sp, 4; stwm 1,framesize(sp)
899 for gcc, or (stw rp, -20(0,sp); stwm 1, framesize(sp) for hcc */
909 status
= target_read_memory (pc
, buf
, 4);
910 inst
= extract_unsigned_integer (buf
, 4);
914 if (inst
== 0x6BC23FD9) /* stw rp,-20(sp) */
916 if (read_memory_integer (pc
+ 4, 4) == 0x8040241) /* copy r4,r1 */
918 else if ((read_memory_integer (pc
+ 4, 4) & ~MASK_14
) == 0x68810000) /* stw r1,(r4) */
921 else if (read_memory_integer (pc
, 4) == 0x8040241) /* copy r4,r1 */
923 else if ((read_memory_integer (pc
, 4) & ~MASK_14
) == 0x68810000) /* stw r1,(r4) */
930 unwind_command (exp
, from_tty
)
938 struct unwind_table_entry
*u
;
941 /* If we have an expression, evaluate it and use it as the address. */
943 if (exp
!= 0 && *exp
!= 0)
944 address
= parse_and_eval_address (exp
);
948 xxx
.u
= find_unwind_entry (address
);
952 printf ("Can't find unwind table entry for PC 0x%x\n", address
);
956 printf ("%08x\n%08X\n%08X\n%08X\n", xxx
.foo
[0], xxx
.foo
[1], xxx
.foo
[2],
961 _initialize_hppa_tdep ()
963 add_com ("unwind", class_obscure
, unwind_command
, "Print unwind info\n");
965 (add_set_cmd ("use_unwind", class_obscure
, var_boolean
,
967 "Set the usage of unwind info", &setlist
),