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
));
65 static int prologue_inst_adjust_sp
PARAMS ((unsigned long));
66 static int is_branch
PARAMS ((unsigned long));
67 static int inst_saves_gr
PARAMS ((unsigned long));
68 static int inst_saves_fr
PARAMS ((unsigned long));
69 static int pc_in_interrupt_handler
PARAMS ((CORE_ADDR
));
70 static int pc_in_linker_stub
PARAMS ((CORE_ADDR
));
73 /* Routines to extract various sized constants out of hppa
76 /* This assumes that no garbage lies outside of the lower bits of
80 sign_extend (val
, bits
)
83 return (int)(val
>> bits
- 1 ? (-1 << bits
) | val
: val
);
86 /* For many immediate values the sign bit is the low bit! */
89 low_sign_extend (val
, bits
)
92 return (int)((val
& 0x1 ? (-1 << (bits
- 1)) : 0) | val
>> 1);
94 /* extract the immediate field from a ld{bhw}s instruction */
97 get_field (val
, from
, to
)
98 unsigned val
, from
, to
;
100 val
= val
>> 31 - to
;
101 return val
& ((1 << 32 - from
) - 1);
105 set_field (val
, from
, to
, new_val
)
106 unsigned *val
, from
, to
;
108 unsigned mask
= ~((1 << (to
- from
+ 1)) << (31 - from
));
109 return *val
= *val
& mask
| (new_val
<< (31 - from
));
112 /* extract a 3-bit space register number from a be, ble, mtsp or mfsp */
117 return GET_FIELD (word
, 18, 18) << 2 | GET_FIELD (word
, 16, 17);
120 extract_5_load (word
)
123 return low_sign_extend (word
>> 16 & MASK_5
, 5);
126 /* extract the immediate field from a st{bhw}s instruction */
129 extract_5_store (word
)
132 return low_sign_extend (word
& MASK_5
, 5);
135 /* extract the immediate field from a break instruction */
138 extract_5r_store (word
)
141 return (word
& MASK_5
);
144 /* extract the immediate field from a {sr}sm instruction */
147 extract_5R_store (word
)
150 return (word
>> 16 & MASK_5
);
153 /* extract an 11 bit immediate field */
159 return low_sign_extend (word
& MASK_11
, 11);
162 /* extract a 14 bit immediate field */
168 return low_sign_extend (word
& MASK_14
, 14);
171 /* deposit a 14 bit constant in a word */
174 deposit_14 (opnd
, word
)
178 unsigned sign
= (opnd
< 0 ? 1 : 0);
180 return word
| ((unsigned)opnd
<< 1 & MASK_14
) | sign
;
183 /* extract a 21 bit constant */
193 val
= GET_FIELD (word
, 20, 20);
195 val
|= GET_FIELD (word
, 9, 19);
197 val
|= GET_FIELD (word
, 5, 6);
199 val
|= GET_FIELD (word
, 0, 4);
201 val
|= GET_FIELD (word
, 7, 8);
202 return sign_extend (val
, 21) << 11;
205 /* deposit a 21 bit constant in a word. Although 21 bit constants are
206 usually the top 21 bits of a 32 bit constant, we assume that only
207 the low 21 bits of opnd are relevant */
210 deposit_21 (opnd
, word
)
215 val
|= GET_FIELD (opnd
, 11 + 14, 11 + 18);
217 val
|= GET_FIELD (opnd
, 11 + 12, 11 + 13);
219 val
|= GET_FIELD (opnd
, 11 + 19, 11 + 20);
221 val
|= GET_FIELD (opnd
, 11 + 1, 11 + 11);
223 val
|= GET_FIELD (opnd
, 11 + 0, 11 + 0);
227 /* extract a 12 bit constant from branch instructions */
233 return sign_extend (GET_FIELD (word
, 19, 28) |
234 GET_FIELD (word
, 29, 29) << 10 |
235 (word
& 0x1) << 11, 12) << 2;
238 /* extract a 17 bit constant from branch instructions, returning the
239 19 bit signed value. */
245 return sign_extend (GET_FIELD (word
, 19, 28) |
246 GET_FIELD (word
, 29, 29) << 10 |
247 GET_FIELD (word
, 11, 15) << 11 |
248 (word
& 0x1) << 16, 17) << 2;
251 /* Lookup the unwind (stack backtrace) info for the given PC. We search all
252 of the objfiles seeking the unwind table entry for this PC. Each objfile
253 contains a sorted list of struct unwind_table_entry. Since we do a binary
254 search of the unwind tables, we depend upon them to be sorted. */
256 static struct unwind_table_entry
*
257 find_unwind_entry(pc
)
260 int first
, middle
, last
;
261 struct objfile
*objfile
;
263 ALL_OBJFILES (objfile
)
265 struct obj_unwind_info
*ui
;
267 ui
= OBJ_UNWIND_INFO (objfile
);
272 /* First, check the cache */
275 && pc
>= ui
->cache
->region_start
276 && pc
<= ui
->cache
->region_end
)
279 /* Not in the cache, do a binary search */
284 while (first
<= last
)
286 middle
= (first
+ last
) / 2;
287 if (pc
>= ui
->table
[middle
].region_start
288 && pc
<= ui
->table
[middle
].region_end
)
290 ui
->cache
= &ui
->table
[middle
];
291 return &ui
->table
[middle
];
294 if (pc
< ui
->table
[middle
].region_start
)
299 } /* ALL_OBJFILES() */
303 /* Called to determine if PC is in an interrupt handler of some
307 pc_in_interrupt_handler (pc
)
310 struct unwind_table_entry
*u
;
311 struct minimal_symbol
*msym_us
;
313 u
= find_unwind_entry (pc
);
317 /* Oh joys. HPUX sets the interrupt bit for _sigreturn even though
318 its frame isn't a pure interrupt frame. Deal with this. */
319 msym_us
= lookup_minimal_symbol_by_pc (pc
);
321 return u
->HP_UX_interrupt_marker
&& !IN_SIGTRAMP (pc
, SYMBOL_NAME (msym_us
));
324 /* Called when no unwind descriptor was found for PC. Returns 1 if it
325 appears that PC is in a linker stub. */
328 pc_in_linker_stub (pc
)
331 int found_magic_instruction
= 0;
335 /* If unable to read memory, assume pc is not in a linker stub. */
336 if (target_read_memory (pc
, buf
, 4) != 0)
339 /* We are looking for something like
341 ; $$dyncall jams RP into this special spot in the frame (RP')
342 ; before calling the "call stub"
345 ldsid (rp),r1 ; Get space associated with RP into r1
346 mtsp r1,sp ; Move it into space register 0
347 be,n 0(sr0),rp) ; back to your regularly scheduled program
350 /* Maximum known linker stub size is 4 instructions. Search forward
351 from the given PC, then backward. */
352 for (i
= 0; i
< 4; i
++)
354 /* If we hit something with an unwind, stop searching this direction. */
356 if (find_unwind_entry (pc
+ i
* 4) != 0)
359 /* Check for ldsid (rp),r1 which is the magic instruction for a
360 return from a cross-space function call. */
361 if (read_memory_integer (pc
+ i
* 4, 4) == 0x004010a1)
363 found_magic_instruction
= 1;
366 /* Add code to handle long call/branch and argument relocation stubs
370 if (found_magic_instruction
!= 0)
373 /* Now look backward. */
374 for (i
= 0; i
< 4; i
++)
376 /* If we hit something with an unwind, stop searching this direction. */
378 if (find_unwind_entry (pc
- i
* 4) != 0)
381 /* Check for ldsid (rp),r1 which is the magic instruction for a
382 return from a cross-space function call. */
383 if (read_memory_integer (pc
- i
* 4, 4) == 0x004010a1)
385 found_magic_instruction
= 1;
388 /* Add code to handle long call/branch and argument relocation stubs
391 return found_magic_instruction
;
395 find_return_regnum(pc
)
398 struct unwind_table_entry
*u
;
400 u
= find_unwind_entry (pc
);
411 /* Return size of frame, or -1 if we should use a frame pointer. */
413 find_proc_framesize (pc
)
416 struct unwind_table_entry
*u
;
417 struct minimal_symbol
*msym_us
;
419 u
= find_unwind_entry (pc
);
423 if (pc_in_linker_stub (pc
))
424 /* Linker stubs have a zero size frame. */
430 msym_us
= lookup_minimal_symbol_by_pc (pc
);
432 /* If Save_SP is set, and we're not in an interrupt or signal caller,
433 then we have a frame pointer. Use it. */
434 if (u
->Save_SP
&& !pc_in_interrupt_handler (pc
)
435 && !IN_SIGTRAMP (pc
, SYMBOL_NAME (msym_us
)))
438 return u
->Total_frame_size
<< 3;
441 /* Return offset from sp at which rp is saved, or 0 if not saved. */
442 static int rp_saved
PARAMS ((CORE_ADDR
));
448 struct unwind_table_entry
*u
;
450 u
= find_unwind_entry (pc
);
454 if (pc_in_linker_stub (pc
))
455 /* This is the so-called RP'. */
463 else if (u
->stub_type
!= 0)
465 switch (u
->stub_type
)
469 case PARAMETER_RELOCATION
:
480 frameless_function_invocation (frame
)
483 struct unwind_table_entry
*u
;
485 u
= find_unwind_entry (frame
->pc
);
488 return frameless_look_for_prologue (frame
);
490 return (u
->Total_frame_size
== 0 && u
->stub_type
== 0);
494 saved_pc_after_call (frame
)
499 ret_regnum
= find_return_regnum (get_frame_pc (frame
));
501 return read_register (ret_regnum
) & ~0x3;
505 frame_saved_pc (frame
)
508 CORE_ADDR pc
= get_frame_pc (frame
);
510 /* BSD, HPUX & OSF1 all lay out the hardware state in the same manner
511 at the base of the frame in an interrupt handler. Registers within
512 are saved in the exact same order as GDB numbers registers. How
514 if (pc_in_interrupt_handler (pc
))
515 return read_memory_integer (frame
->frame
+ PC_REGNUM
* 4, 4) & ~0x3;
517 /* Deal with signal handler caller frames too. */
518 if (frame
->signal_handler_caller
)
521 FRAME_SAVED_PC_IN_SIGTRAMP (frame
, &rp
);
525 if (frameless_function_invocation (frame
))
529 ret_regnum
= find_return_regnum (pc
);
531 /* If the next frame is an interrupt frame or a signal
532 handler caller, then we need to look in the saved
533 register area to get the return pointer (the values
534 in the registers may not correspond to anything useful). */
536 && (frame
->next
->signal_handler_caller
537 || pc_in_interrupt_handler (frame
->next
->pc
)))
539 struct frame_info
*fi
;
540 struct frame_saved_regs saved_regs
;
542 fi
= get_frame_info (frame
->next
);
543 get_frame_saved_regs (fi
, &saved_regs
);
544 if (read_memory_integer (saved_regs
.regs
[FLAGS_REGNUM
] & 0x2, 4))
545 return read_memory_integer (saved_regs
.regs
[31], 4);
547 return read_memory_integer (saved_regs
.regs
[RP_REGNUM
], 4);
550 return read_register (ret_regnum
) & ~0x3;
554 int rp_offset
= rp_saved (pc
);
556 /* Similar to code in frameless function case. If the next
557 frame is a signal or interrupt handler, then dig the right
558 information out of the saved register info. */
561 && (frame
->next
->signal_handler_caller
562 || pc_in_interrupt_handler (frame
->next
->pc
)))
564 struct frame_info
*fi
;
565 struct frame_saved_regs saved_regs
;
567 fi
= get_frame_info (frame
->next
);
568 get_frame_saved_regs (fi
, &saved_regs
);
569 if (read_memory_integer (saved_regs
.regs
[FLAGS_REGNUM
] & 0x2, 4))
570 return read_memory_integer (saved_regs
.regs
[31], 4);
572 return read_memory_integer (saved_regs
.regs
[RP_REGNUM
], 4);
574 else if (rp_offset
== 0)
575 return read_register (RP_REGNUM
) & ~0x3;
577 return read_memory_integer (frame
->frame
+ rp_offset
, 4) & ~0x3;
581 /* We need to correct the PC and the FP for the outermost frame when we are
585 init_extra_frame_info (fromleaf
, frame
)
587 struct frame_info
*frame
;
592 if (frame
->next
&& !fromleaf
)
595 /* If the next frame represents a frameless function invocation
596 then we have to do some adjustments that are normally done by
597 FRAME_CHAIN. (FRAME_CHAIN is not called in this case.) */
600 /* Find the framesize of *this* frame without peeking at the PC
601 in the current frame structure (it isn't set yet). */
602 framesize
= find_proc_framesize (FRAME_SAVED_PC (get_next_frame (frame
)));
604 /* Now adjust our base frame accordingly. If we have a frame pointer
605 use it, else subtract the size of this frame from the current
606 frame. (we always want frame->frame to point at the lowest address
609 frame
->frame
= read_register (FP_REGNUM
);
611 frame
->frame
-= framesize
;
615 flags
= read_register (FLAGS_REGNUM
);
616 if (flags
& 2) /* In system call? */
617 frame
->pc
= read_register (31) & ~0x3;
619 /* The outermost frame is always derived from PC-framesize
621 One might think frameless innermost frames should have
622 a frame->frame that is the same as the parent's frame->frame.
623 That is wrong; frame->frame in that case should be the *high*
624 address of the parent's frame. It's complicated as hell to
625 explain, but the parent *always* creates some stack space for
626 the child. So the child actually does have a frame of some
627 sorts, and its base is the high address in its parent's frame. */
628 framesize
= find_proc_framesize(frame
->pc
);
630 frame
->frame
= read_register (FP_REGNUM
);
632 frame
->frame
= read_register (SP_REGNUM
) - framesize
;
635 /* Given a GDB frame, determine the address of the calling function's frame.
636 This will be used to create a new GDB frame struct, and then
637 INIT_EXTRA_FRAME_INFO and INIT_FRAME_PC will be called for the new frame.
639 This may involve searching through prologues for several functions
640 at boundaries where GCC calls HP C code, or where code which has
641 a frame pointer calls code without a frame pointer. */
646 struct frame_info
*frame
;
648 int my_framesize
, caller_framesize
;
649 struct unwind_table_entry
*u
;
650 CORE_ADDR frame_base
;
652 /* Handle HPUX, BSD, and OSF1 style interrupt frames first. These
653 are easy; at *sp we have a full save state strucutre which we can
654 pull the old stack pointer from. Also see frame_saved_pc for
655 code to dig a saved PC out of the save state structure. */
656 if (pc_in_interrupt_handler (frame
->pc
))
657 frame_base
= read_memory_integer (frame
->frame
+ SP_REGNUM
* 4, 4);
658 else if (frame
->signal_handler_caller
)
660 FRAME_BASE_BEFORE_SIGTRAMP (frame
, &frame_base
);
663 frame_base
= frame
->frame
;
665 /* Get frame sizes for the current frame and the frame of the
667 my_framesize
= find_proc_framesize (frame
->pc
);
668 caller_framesize
= find_proc_framesize (FRAME_SAVED_PC(frame
));
670 /* If caller does not have a frame pointer, then its frame
671 can be found at current_frame - caller_framesize. */
672 if (caller_framesize
!= -1)
673 return frame_base
- caller_framesize
;
675 /* Both caller and callee have frame pointers and are GCC compiled
676 (SAVE_SP bit in unwind descriptor is on for both functions.
677 The previous frame pointer is found at the top of the current frame. */
678 if (caller_framesize
== -1 && my_framesize
== -1)
679 return read_memory_integer (frame_base
, 4);
681 /* Caller has a frame pointer, but callee does not. This is a little
682 more difficult as GCC and HP C lay out locals and callee register save
683 areas very differently.
685 The previous frame pointer could be in a register, or in one of
686 several areas on the stack.
688 Walk from the current frame to the innermost frame examining
689 unwind descriptors to determine if %r3 ever gets saved into the
690 stack. If so return whatever value got saved into the stack.
691 If it was never saved in the stack, then the value in %r3 is still
694 We use information from unwind descriptors to determine if %r3
695 is saved into the stack (Entry_GR field has this information). */
699 u
= find_unwind_entry (frame
->pc
);
703 /* We could find this information by examining prologues. I don't
704 think anyone has actually written any tools (not even "strip")
705 which leave them out of an executable, so maybe this is a moot
707 warning ("Unable to find unwind for PC 0x%x -- Help!", frame
->pc
);
711 /* Entry_GR specifies the number of callee-saved general registers
712 saved in the stack. It starts at %r3, so %r3 would be 1. */
713 if (u
->Entry_GR
>= 1 || u
->Save_SP
714 || frame
->signal_handler_caller
715 || pc_in_interrupt_handler (frame
->pc
))
723 /* We may have walked down the chain into a function with a frame
726 && !frame
->signal_handler_caller
727 && !pc_in_interrupt_handler (frame
->pc
))
728 return read_memory_integer (frame
->frame
, 4);
729 /* %r3 was saved somewhere in the stack. Dig it out. */
732 struct frame_info
*fi
;
733 struct frame_saved_regs saved_regs
;
735 fi
= get_frame_info (frame
);
736 get_frame_saved_regs (fi
, &saved_regs
);
737 return read_memory_integer (saved_regs
.regs
[FP_REGNUM
], 4);
742 /* The value in %r3 was never saved into the stack (thus %r3 still
743 holds the value of the previous frame pointer). */
744 return read_register (FP_REGNUM
);
749 /* To see if a frame chain is valid, see if the caller looks like it
750 was compiled with gcc. */
753 frame_chain_valid (chain
, thisframe
)
757 struct minimal_symbol
*msym_us
;
758 struct minimal_symbol
*msym_start
;
759 struct unwind_table_entry
*u
, *next_u
= NULL
;
765 u
= find_unwind_entry (thisframe
->pc
);
770 /* We can't just check that the same of msym_us is "_start", because
771 someone idiotically decided that they were going to make a Ltext_end
772 symbol with the same address. This Ltext_end symbol is totally
773 indistinguishable (as nearly as I can tell) from the symbol for a function
774 which is (legitimately, since it is in the user's namespace)
775 named Ltext_end, so we can't just ignore it. */
776 msym_us
= lookup_minimal_symbol_by_pc (FRAME_SAVED_PC (thisframe
));
777 msym_start
= lookup_minimal_symbol ("_start", NULL
);
780 && SYMBOL_VALUE_ADDRESS (msym_us
) == SYMBOL_VALUE_ADDRESS (msym_start
))
783 next
= get_next_frame (thisframe
);
785 next_u
= find_unwind_entry (next
->pc
);
787 /* If this frame does not save SP, has no stack, isn't a stub,
788 and doesn't "call" an interrupt routine or signal handler caller,
789 then its not valid. */
790 if (u
->Save_SP
|| u
->Total_frame_size
|| u
->stub_type
!= 0
791 || (thisframe
->next
&& thisframe
->next
->signal_handler_caller
)
792 || (next_u
&& next_u
->HP_UX_interrupt_marker
))
795 if (pc_in_linker_stub (thisframe
->pc
))
802 * These functions deal with saving and restoring register state
803 * around a function call in the inferior. They keep the stack
804 * double-word aligned; eventually, on an hp700, the stack will have
805 * to be aligned to a 64-byte boundary.
811 register CORE_ADDR sp
;
816 /* Space for "arguments"; the RP goes in here. */
817 sp
= read_register (SP_REGNUM
) + 48;
818 int_buffer
= read_register (RP_REGNUM
) | 0x3;
819 write_memory (sp
- 20, (char *)&int_buffer
, 4);
821 int_buffer
= read_register (FP_REGNUM
);
822 write_memory (sp
, (char *)&int_buffer
, 4);
824 write_register (FP_REGNUM
, sp
);
828 for (regnum
= 1; regnum
< 32; regnum
++)
829 if (regnum
!= RP_REGNUM
&& regnum
!= FP_REGNUM
)
830 sp
= push_word (sp
, read_register (regnum
));
834 for (regnum
= FP0_REGNUM
; regnum
< NUM_REGS
; regnum
++)
836 read_register_bytes (REGISTER_BYTE (regnum
), (char *)&freg_buffer
, 8);
837 sp
= push_bytes (sp
, (char *)&freg_buffer
, 8);
839 sp
= push_word (sp
, read_register (IPSW_REGNUM
));
840 sp
= push_word (sp
, read_register (SAR_REGNUM
));
841 sp
= push_word (sp
, read_register (PCOQ_HEAD_REGNUM
));
842 sp
= push_word (sp
, read_register (PCSQ_HEAD_REGNUM
));
843 sp
= push_word (sp
, read_register (PCOQ_TAIL_REGNUM
));
844 sp
= push_word (sp
, read_register (PCSQ_TAIL_REGNUM
));
845 write_register (SP_REGNUM
, sp
);
848 find_dummy_frame_regs (frame
, frame_saved_regs
)
849 struct frame_info
*frame
;
850 struct frame_saved_regs
*frame_saved_regs
;
852 CORE_ADDR fp
= frame
->frame
;
855 frame_saved_regs
->regs
[RP_REGNUM
] = fp
- 20 & ~0x3;
856 frame_saved_regs
->regs
[FP_REGNUM
] = fp
;
857 frame_saved_regs
->regs
[1] = fp
+ 8;
859 for (fp
+= 12, i
= 3; i
< 32; i
++)
863 frame_saved_regs
->regs
[i
] = fp
;
869 for (i
= FP0_REGNUM
; i
< NUM_REGS
; i
++, fp
+= 8)
870 frame_saved_regs
->regs
[i
] = fp
;
872 frame_saved_regs
->regs
[IPSW_REGNUM
] = fp
;
873 frame_saved_regs
->regs
[SAR_REGNUM
] = fp
+ 4;
874 frame_saved_regs
->regs
[PCOQ_HEAD_REGNUM
] = fp
+ 8;
875 frame_saved_regs
->regs
[PCSQ_HEAD_REGNUM
] = fp
+ 12;
876 frame_saved_regs
->regs
[PCOQ_TAIL_REGNUM
] = fp
+ 16;
877 frame_saved_regs
->regs
[PCSQ_TAIL_REGNUM
] = fp
+ 20;
883 register FRAME frame
= get_current_frame ();
884 register CORE_ADDR fp
;
886 struct frame_saved_regs fsr
;
887 struct frame_info
*fi
;
890 fi
= get_frame_info (frame
);
892 get_frame_saved_regs (fi
, &fsr
);
894 #ifndef NO_PC_SPACE_QUEUE_RESTORE
895 if (fsr
.regs
[IPSW_REGNUM
]) /* Restoring a call dummy frame */
896 restore_pc_queue (&fsr
);
899 for (regnum
= 31; regnum
> 0; regnum
--)
900 if (fsr
.regs
[regnum
])
901 write_register (regnum
, read_memory_integer (fsr
.regs
[regnum
], 4));
903 for (regnum
= NUM_REGS
- 1; regnum
>= FP0_REGNUM
; regnum
--)
904 if (fsr
.regs
[regnum
])
906 read_memory (fsr
.regs
[regnum
], (char *)&freg_buffer
, 8);
907 write_register_bytes (REGISTER_BYTE (regnum
), (char *)&freg_buffer
, 8);
910 if (fsr
.regs
[IPSW_REGNUM
])
911 write_register (IPSW_REGNUM
,
912 read_memory_integer (fsr
.regs
[IPSW_REGNUM
], 4));
914 if (fsr
.regs
[SAR_REGNUM
])
915 write_register (SAR_REGNUM
,
916 read_memory_integer (fsr
.regs
[SAR_REGNUM
], 4));
918 /* If the PC was explicitly saved, then just restore it. */
919 if (fsr
.regs
[PCOQ_TAIL_REGNUM
])
920 write_register (PCOQ_TAIL_REGNUM
,
921 read_memory_integer (fsr
.regs
[PCOQ_TAIL_REGNUM
], 4));
923 /* Else use the value in %rp to set the new PC. */
925 target_write_pc (read_register (RP_REGNUM
));
927 write_register (FP_REGNUM
, read_memory_integer (fp
, 4));
929 if (fsr
.regs
[IPSW_REGNUM
]) /* call dummy */
930 write_register (SP_REGNUM
, fp
- 48);
932 write_register (SP_REGNUM
, fp
);
934 flush_cached_frames ();
935 set_current_frame (create_new_frame (read_register (FP_REGNUM
),
940 * After returning to a dummy on the stack, restore the instruction
941 * queue space registers. */
944 restore_pc_queue (fsr
)
945 struct frame_saved_regs
*fsr
;
947 CORE_ADDR pc
= read_pc ();
948 CORE_ADDR new_pc
= read_memory_integer (fsr
->regs
[PCOQ_HEAD_REGNUM
], 4);
950 struct target_waitstatus w
;
953 /* Advance past break instruction in the call dummy. */
954 write_register (PCOQ_HEAD_REGNUM
, pc
+ 4);
955 write_register (PCOQ_TAIL_REGNUM
, pc
+ 8);
958 * HPUX doesn't let us set the space registers or the space
959 * registers of the PC queue through ptrace. Boo, hiss.
960 * Conveniently, the call dummy has this sequence of instructions
965 * So, load up the registers and single step until we are in the
969 write_register (21, read_memory_integer (fsr
->regs
[PCSQ_HEAD_REGNUM
], 4));
970 write_register (22, new_pc
);
972 for (insn_count
= 0; insn_count
< 3; insn_count
++)
974 /* FIXME: What if the inferior gets a signal right now? Want to
975 merge this into wait_for_inferior (as a special kind of
976 watchpoint? By setting a breakpoint at the end? Is there
977 any other choice? Is there *any* way to do this stuff with
978 ptrace() or some equivalent?). */
980 target_wait (inferior_pid
, &w
);
982 if (w
.kind
== TARGET_WAITKIND_SIGNALLED
)
984 stop_signal
= w
.value
.sig
;
985 terminal_ours_for_output ();
986 printf_unfiltered ("\nProgram terminated with signal %s, %s.\n",
987 target_signal_to_name (stop_signal
),
988 target_signal_to_string (stop_signal
));
989 gdb_flush (gdb_stdout
);
993 target_terminal_ours ();
994 fetch_inferior_registers (-1);
999 hppa_push_arguments (nargs
, args
, sp
, struct_return
, struct_addr
)
1004 CORE_ADDR struct_addr
;
1006 /* array of arguments' offsets */
1007 int *offset
= (int *)alloca(nargs
* sizeof (int));
1011 for (i
= 0; i
< nargs
; i
++)
1013 /* Coerce chars to int & float to double if necessary */
1014 args
[i
] = value_arg_coerce (args
[i
]);
1016 cum
+= TYPE_LENGTH (VALUE_TYPE (args
[i
]));
1018 /* value must go at proper alignment. Assume alignment is a
1020 alignment
= hppa_alignof (VALUE_TYPE (args
[i
]));
1021 if (cum
% alignment
)
1022 cum
= (cum
+ alignment
) & -alignment
;
1025 sp
+= max ((cum
+ 7) & -8, 16);
1027 for (i
= 0; i
< nargs
; i
++)
1028 write_memory (sp
+ offset
[i
], VALUE_CONTENTS (args
[i
]),
1029 TYPE_LENGTH (VALUE_TYPE (args
[i
])));
1032 write_register (28, struct_addr
);
1037 * Insert the specified number of args and function address
1038 * into a call sequence of the above form stored at DUMMYNAME.
1040 * On the hppa we need to call the stack dummy through $$dyncall.
1041 * Therefore our version of FIX_CALL_DUMMY takes an extra argument,
1042 * real_pc, which is the location where gdb should start up the
1043 * inferior to do the function call.
1047 hppa_fix_call_dummy (dummy
, pc
, fun
, nargs
, args
, type
, gcc_p
)
1056 CORE_ADDR dyncall_addr
, sr4export_addr
;
1057 struct minimal_symbol
*msymbol
;
1058 int flags
= read_register (FLAGS_REGNUM
);
1059 struct unwind_table_entry
*u
;
1061 msymbol
= lookup_minimal_symbol ("$$dyncall", (struct objfile
*) NULL
);
1062 if (msymbol
== NULL
)
1063 error ("Can't find an address for $$dyncall trampoline");
1065 dyncall_addr
= SYMBOL_VALUE_ADDRESS (msymbol
);
1067 /* If we are calling an import stub (eg calling into a dynamic library)
1068 then have sr4export call the magic __d_plt_call routine which is linked
1069 in from end.o. (You can't use _sr4export to call the import stub as
1070 the value in sp-24 will get fried and you end up returning to the
1071 wrong location. You can't call the import stub directly as the code
1072 to bind the PLT entry to a function can't return to a stack address.) */
1073 u
= find_unwind_entry (fun
);
1074 if (u
&& u
->stub_type
== IMPORT
)
1077 msymbol
= lookup_minimal_symbol ("__d_plt_call", (struct objfile
*) NULL
);
1078 if (msymbol
== NULL
)
1079 error ("Can't find an address for __d_plt_call trampoline");
1081 /* This is where sr4export will jump to. */
1082 new_fun
= SYMBOL_VALUE_ADDRESS (msymbol
);
1084 /* We have to store the address of the stub in __shlib_funcptr. */
1085 msymbol
= lookup_minimal_symbol ("__shlib_funcptr",
1086 (struct objfile
*)NULL
);
1087 if (msymbol
== NULL
)
1088 error ("Can't find an address for __shlib_funcptr");
1090 target_write_memory (SYMBOL_VALUE_ADDRESS (msymbol
), (char *)&fun
, 4);
1095 /* We still need sr4export's address too. */
1096 msymbol
= lookup_minimal_symbol ("_sr4export", (struct objfile
*) NULL
);
1097 if (msymbol
== NULL
)
1098 error ("Can't find an address for _sr4export trampoline");
1100 sr4export_addr
= SYMBOL_VALUE_ADDRESS (msymbol
);
1102 store_unsigned_integer
1103 (&dummy
[9*REGISTER_SIZE
],
1105 deposit_21 (fun
>> 11,
1106 extract_unsigned_integer (&dummy
[9*REGISTER_SIZE
],
1108 store_unsigned_integer
1109 (&dummy
[10*REGISTER_SIZE
],
1111 deposit_14 (fun
& MASK_11
,
1112 extract_unsigned_integer (&dummy
[10*REGISTER_SIZE
],
1114 store_unsigned_integer
1115 (&dummy
[12*REGISTER_SIZE
],
1117 deposit_21 (sr4export_addr
>> 11,
1118 extract_unsigned_integer (&dummy
[12*REGISTER_SIZE
],
1120 store_unsigned_integer
1121 (&dummy
[13*REGISTER_SIZE
],
1123 deposit_14 (sr4export_addr
& MASK_11
,
1124 extract_unsigned_integer (&dummy
[13*REGISTER_SIZE
],
1127 write_register (22, pc
);
1129 /* If we are in a syscall, then we should call the stack dummy
1130 directly. $$dyncall is not needed as the kernel sets up the
1131 space id registers properly based on the value in %r31. In
1132 fact calling $$dyncall will not work because the value in %r22
1133 will be clobbered on the syscall exit path. */
1137 return dyncall_addr
;
1141 /* Get the PC from %r31 if currently in a syscall. Also mask out privilege
1146 int flags
= read_register (FLAGS_REGNUM
);
1149 return read_register (31) & ~0x3;
1150 return read_register (PC_REGNUM
) & ~0x3;
1153 /* Write out the PC. If currently in a syscall, then also write the new
1154 PC value into %r31. */
1159 int flags
= read_register (FLAGS_REGNUM
);
1161 /* If in a syscall, then set %r31. Also make sure to get the
1162 privilege bits set correctly. */
1164 write_register (31, (long) (v
| 0x3));
1166 write_register (PC_REGNUM
, (long) v
);
1167 write_register (NPC_REGNUM
, (long) v
+ 4);
1170 /* return the alignment of a type in bytes. Structures have the maximum
1171 alignment required by their fields. */
1177 int max_align
, align
, i
;
1178 switch (TYPE_CODE (arg
))
1183 return TYPE_LENGTH (arg
);
1184 case TYPE_CODE_ARRAY
:
1185 return hppa_alignof (TYPE_FIELD_TYPE (arg
, 0));
1186 case TYPE_CODE_STRUCT
:
1187 case TYPE_CODE_UNION
:
1189 for (i
= 0; i
< TYPE_NFIELDS (arg
); i
++)
1191 /* Bit fields have no real alignment. */
1192 if (!TYPE_FIELD_BITPOS (arg
, i
))
1194 align
= hppa_alignof (TYPE_FIELD_TYPE (arg
, i
));
1195 max_align
= max (max_align
, align
);
1204 /* Print the register regnum, or all registers if regnum is -1 */
1206 pa_do_registers_info (regnum
, fpregs
)
1210 char raw_regs
[REGISTER_BYTES
];
1213 for (i
= 0; i
< NUM_REGS
; i
++)
1214 read_relative_register_raw_bytes (i
, raw_regs
+ REGISTER_BYTE (i
));
1216 pa_print_registers (raw_regs
, regnum
, fpregs
);
1217 else if (regnum
< FP0_REGNUM
)
1218 printf_unfiltered ("%s %x\n", reg_names
[regnum
], *(long *)(raw_regs
+
1219 REGISTER_BYTE (regnum
)));
1221 pa_print_fp_reg (regnum
);
1224 pa_print_registers (raw_regs
, regnum
, fpregs
)
1231 for (i
= 0; i
< 18; i
++)
1232 printf_unfiltered ("%8.8s: %8x %8.8s: %8x %8.8s: %8x %8.8s: %8x\n",
1234 *(int *)(raw_regs
+ REGISTER_BYTE (i
)),
1236 *(int *)(raw_regs
+ REGISTER_BYTE (i
+ 18)),
1238 *(int *)(raw_regs
+ REGISTER_BYTE (i
+ 36)),
1240 *(int *)(raw_regs
+ REGISTER_BYTE (i
+ 54)));
1243 for (i
= 72; i
< NUM_REGS
; i
++)
1244 pa_print_fp_reg (i
);
1250 unsigned char raw_buffer
[MAX_REGISTER_RAW_SIZE
];
1251 unsigned char virtual_buffer
[MAX_REGISTER_VIRTUAL_SIZE
];
1253 /* Get 32bits of data. */
1254 read_relative_register_raw_bytes (i
, raw_buffer
);
1256 /* Put it in the buffer. No conversions are ever necessary. */
1257 memcpy (virtual_buffer
, raw_buffer
, REGISTER_RAW_SIZE (i
));
1259 fputs_filtered (reg_names
[i
], gdb_stdout
);
1260 print_spaces_filtered (8 - strlen (reg_names
[i
]), gdb_stdout
);
1261 fputs_filtered ("(single precision) ", gdb_stdout
);
1263 val_print (REGISTER_VIRTUAL_TYPE (i
), virtual_buffer
, 0, gdb_stdout
, 0,
1264 1, 0, Val_pretty_default
);
1265 printf_filtered ("\n");
1267 /* If "i" is even, then this register can also be a double-precision
1268 FP register. Dump it out as such. */
1271 /* Get the data in raw format for the 2nd half. */
1272 read_relative_register_raw_bytes (i
+ 1, raw_buffer
);
1274 /* Copy it into the appropriate part of the virtual buffer. */
1275 memcpy (virtual_buffer
+ REGISTER_RAW_SIZE (i
), raw_buffer
,
1276 REGISTER_RAW_SIZE (i
));
1278 /* Dump it as a double. */
1279 fputs_filtered (reg_names
[i
], gdb_stdout
);
1280 print_spaces_filtered (8 - strlen (reg_names
[i
]), gdb_stdout
);
1281 fputs_filtered ("(double precision) ", gdb_stdout
);
1283 val_print (builtin_type_double
, virtual_buffer
, 0, gdb_stdout
, 0,
1284 1, 0, Val_pretty_default
);
1285 printf_filtered ("\n");
1289 /* Figure out if PC is in a trampoline, and if so find out where
1290 the trampoline will jump to. If not in a trampoline, return zero.
1292 Simple code examination probably is not a good idea since the code
1293 sequences in trampolines can also appear in user code.
1295 We use unwinds and information from the minimal symbol table to
1296 determine when we're in a trampoline. This won't work for ELF
1297 (yet) since it doesn't create stub unwind entries. Whether or
1298 not ELF will create stub unwinds or normal unwinds for linker
1299 stubs is still being debated.
1301 This should handle simple calls through dyncall or sr4export,
1302 long calls, argument relocation stubs, and dyncall/sr4export
1303 calling an argument relocation stub. It even handles some stubs
1304 used in dynamic executables. */
1307 skip_trampoline_code (pc
, name
)
1312 long prev_inst
, curr_inst
, loc
;
1313 static CORE_ADDR dyncall
= 0;
1314 static CORE_ADDR sr4export
= 0;
1315 struct minimal_symbol
*msym
;
1316 struct unwind_table_entry
*u
;
1318 /* FIXME XXX - dyncall and sr4export must be initialized whenever we get a
1323 msym
= lookup_minimal_symbol ("$$dyncall", NULL
);
1325 dyncall
= SYMBOL_VALUE_ADDRESS (msym
);
1332 msym
= lookup_minimal_symbol ("_sr4export", NULL
);
1334 sr4export
= SYMBOL_VALUE_ADDRESS (msym
);
1339 /* Addresses passed to dyncall may *NOT* be the actual address
1340 of the funtion. So we may have to do something special. */
1343 pc
= (CORE_ADDR
) read_register (22);
1345 /* If bit 30 (counting from the left) is on, then pc is the address of
1346 the PLT entry for this function, not the address of the function
1347 itself. Bit 31 has meaning too, but only for MPE. */
1349 pc
= (CORE_ADDR
) read_memory_integer (pc
& ~0x3, 4);
1351 else if (pc
== sr4export
)
1352 pc
= (CORE_ADDR
) (read_register (22));
1354 /* Get the unwind descriptor corresponding to PC, return zero
1355 if no unwind was found. */
1356 u
= find_unwind_entry (pc
);
1360 /* If this isn't a linker stub, then return now. */
1361 if (u
->stub_type
== 0)
1362 return orig_pc
== pc
? 0 : pc
& ~0x3;
1364 /* It's a stub. Search for a branch and figure out where it goes.
1365 Note we have to handle multi insn branch sequences like ldil;ble.
1366 Most (all?) other branches can be determined by examining the contents
1367 of certain registers and the stack. */
1373 /* Make sure we haven't walked outside the range of this stub. */
1374 if (u
!= find_unwind_entry (loc
))
1376 warning ("Unable to find branch in linker stub");
1377 return orig_pc
== pc
? 0 : pc
& ~0x3;
1380 prev_inst
= curr_inst
;
1381 curr_inst
= read_memory_integer (loc
, 4);
1383 /* Does it look like a branch external using %r1? Then it's the
1384 branch from the stub to the actual function. */
1385 if ((curr_inst
& 0xffe0e000) == 0xe0202000)
1387 /* Yup. See if the previous instruction loaded
1388 a value into %r1. If so compute and return the jump address. */
1389 if ((prev_inst
& 0xffe00000) == 0x20202000)
1390 return (extract_21 (prev_inst
) + extract_17 (curr_inst
)) & ~0x3;
1393 warning ("Unable to find ldil X,%%r1 before ble Y(%%sr4,%%r1).");
1394 return orig_pc
== pc
? 0 : pc
& ~0x3;
1398 /* Does it look like bl X,rp? Another way to do a branch from the
1399 stub to the actual function. */
1400 else if ((curr_inst
& 0xffe0e000) == 0xe8400000)
1401 return (loc
+ extract_17 (curr_inst
) + 8) & ~0x3;
1403 /* Does it look like bv (rp)? Note this depends on the
1404 current stack pointer being the same as the stack
1405 pointer in the stub itself! This is a branch on from the
1406 stub back to the original caller. */
1407 else if ((curr_inst
& 0xffe0e000) == 0xe840c000)
1409 /* Yup. See if the previous instruction loaded
1411 if (prev_inst
== 0x4bc23ff1)
1412 return (read_memory_integer
1413 (read_register (SP_REGNUM
) - 8, 4)) & ~0x3;
1416 warning ("Unable to find restore of %%rp before bv (%%rp).");
1417 return orig_pc
== pc
? 0 : pc
& ~0x3;
1421 /* What about be,n 0(sr0,%rp)? It's just another way we return to
1422 the original caller from the stub. Used in dynamic executables. */
1423 else if (curr_inst
== 0xe0400002)
1425 /* The value we jump to is sitting in sp - 24. But that's
1426 loaded several instructions before the be instruction.
1427 I guess we could check for the previous instruction being
1428 mtsp %r1,%sr0 if we want to do sanity checking. */
1429 return (read_memory_integer
1430 (read_register (SP_REGNUM
) - 24, 4)) & ~0x3;
1433 /* Haven't found the branch yet, but we're still in the stub.
1439 /* For the given instruction (INST), return any adjustment it makes
1440 to the stack pointer or zero for no adjustment.
1442 This only handles instructions commonly found in prologues. */
1445 prologue_inst_adjust_sp (inst
)
1448 /* This must persist across calls. */
1449 static int save_high21
;
1451 /* The most common way to perform a stack adjustment ldo X(sp),sp */
1452 if ((inst
& 0xffffc000) == 0x37de0000)
1453 return extract_14 (inst
);
1456 if ((inst
& 0xffe00000) == 0x6fc00000)
1457 return extract_14 (inst
);
1459 /* addil high21,%r1; ldo low11,(%r1),%r30)
1460 save high bits in save_high21 for later use. */
1461 if ((inst
& 0xffe00000) == 0x28200000)
1463 save_high21
= extract_21 (inst
);
1467 if ((inst
& 0xffff0000) == 0x343e0000)
1468 return save_high21
+ extract_14 (inst
);
1470 /* fstws as used by the HP compilers. */
1471 if ((inst
& 0xffffffe0) == 0x2fd01220)
1472 return extract_5_load (inst
);
1474 /* No adjustment. */
1478 /* Return nonzero if INST is a branch of some kind, else return zero. */
1508 /* Return the register number for a GR which is saved by INST or
1509 zero it INST does not save a GR.
1511 Note we only care about full 32bit register stores (that's the only
1512 kind of stores the prologue will use). */
1515 inst_saves_gr (inst
)
1518 /* Does it look like a stw? */
1519 if ((inst
>> 26) == 0x1a)
1520 return extract_5R_store (inst
);
1522 /* Does it look like a stwm? */
1523 if ((inst
>> 26) == 0x1b)
1524 return extract_5R_store (inst
);
1529 /* Return the register number for a FR which is saved by INST or
1530 zero it INST does not save a FR.
1532 Note we only care about full 64bit register stores (that's the only
1533 kind of stores the prologue will use). */
1536 inst_saves_fr (inst
)
1539 if ((inst
& 0xfc1fffe0) == 0x2c101220)
1540 return extract_5r_store (inst
);
1544 /* Advance PC across any function entry prologue instructions
1545 to reach some "real" code.
1547 Use information in the unwind table to determine what exactly should
1548 be in the prologue. */
1555 unsigned long inst
, stack_remaining
, save_gr
, save_fr
, save_rp
, save_sp
;
1557 struct unwind_table_entry
*u
;
1559 u
= find_unwind_entry (pc
);
1563 /* If we are not at the beginning of a function, then return now. */
1564 if ((pc
& ~0x3) != u
->region_start
)
1567 /* This is how much of a frame adjustment we need to account for. */
1568 stack_remaining
= u
->Total_frame_size
<< 3;
1570 /* Magic register saves we want to know about. */
1571 save_rp
= u
->Save_RP
;
1572 save_sp
= u
->Save_SP
;
1574 /* Turn the Entry_GR field into a bitmask. */
1576 for (i
= 3; i
< u
->Entry_GR
+ 3; i
++)
1578 /* Frame pointer gets saved into a special location. */
1579 if (u
->Save_SP
&& i
== FP_REGNUM
)
1582 save_gr
|= (1 << i
);
1585 /* Turn the Entry_FR field into a bitmask too. */
1587 for (i
= 12; i
< u
->Entry_FR
+ 12; i
++)
1588 save_fr
|= (1 << i
);
1590 /* Loop until we find everything of interest or hit a branch.
1592 For unoptimized GCC code and for any HP CC code this will never ever
1593 examine any user instructions.
1595 For optimzied GCC code we're faced with problems. GCC will schedule
1596 its prologue and make prologue instructions available for delay slot
1597 filling. The end result is user code gets mixed in with the prologue
1598 and a prologue instruction may be in the delay slot of the first branch
1601 Some unexpected things are expected with debugging optimized code, so
1602 we allow this routine to walk past user instructions in optimized
1604 while (save_gr
|| save_fr
|| save_rp
|| save_sp
|| stack_remaining
> 0)
1606 status
= target_read_memory (pc
, buf
, 4);
1607 inst
= extract_unsigned_integer (buf
, 4);
1613 /* Note the interesting effects of this instruction. */
1614 stack_remaining
-= prologue_inst_adjust_sp (inst
);
1616 /* There is only one instruction used for saving RP into the stack. */
1617 if (inst
== 0x6bc23fd9)
1620 /* This is the only way we save SP into the stack. At this time
1621 the HP compilers never bother to save SP into the stack. */
1622 if ((inst
& 0xffffc000) == 0x6fc10000)
1625 /* Account for general and floating-point register saves. */
1626 save_gr
&= ~(1 << inst_saves_gr (inst
));
1627 save_fr
&= ~(1 << inst_saves_fr (inst
));
1629 /* Quit if we hit any kind of branch. This can happen if a prologue
1630 instruction is in the delay slot of the first call/branch. */
1631 if (is_branch (inst
))
1641 /* Put here the code to store, into a struct frame_saved_regs,
1642 the addresses of the saved registers of frame described by FRAME_INFO.
1643 This includes special registers such as pc and fp saved in special
1644 ways in the stack frame. sp is even more special:
1645 the address we return for it IS the sp for the next frame. */
1648 hppa_frame_find_saved_regs (frame_info
, frame_saved_regs
)
1649 struct frame_info
*frame_info
;
1650 struct frame_saved_regs
*frame_saved_regs
;
1653 struct unwind_table_entry
*u
;
1654 unsigned long inst
, stack_remaining
, save_gr
, save_fr
, save_rp
, save_sp
;
1659 /* Zero out everything. */
1660 memset (frame_saved_regs
, '\0', sizeof (struct frame_saved_regs
));
1662 /* Call dummy frames always look the same, so there's no need to
1663 examine the dummy code to determine locations of saved registers;
1664 instead, let find_dummy_frame_regs fill in the correct offsets
1665 for the saved registers. */
1666 if ((frame_info
->pc
>= frame_info
->frame
1667 && frame_info
->pc
<= (frame_info
->frame
+ CALL_DUMMY_LENGTH
1668 + 32 * 4 + (NUM_REGS
- FP0_REGNUM
) * 8
1670 find_dummy_frame_regs (frame_info
, frame_saved_regs
);
1672 /* Interrupt handlers are special too. They lay out the register
1673 state in the exact same order as the register numbers in GDB. */
1674 if (pc_in_interrupt_handler (frame_info
->pc
))
1676 for (i
= 0; i
< NUM_REGS
; i
++)
1678 /* SP is a little special. */
1680 frame_saved_regs
->regs
[SP_REGNUM
]
1681 = read_memory_integer (frame_info
->frame
+ SP_REGNUM
* 4, 4);
1683 frame_saved_regs
->regs
[i
] = frame_info
->frame
+ i
* 4;
1688 /* Handle signal handler callers. */
1689 if (frame_info
->signal_handler_caller
)
1691 FRAME_FIND_SAVED_REGS_IN_SIGTRAMP (frame_info
, frame_saved_regs
);
1695 /* Get the starting address of the function referred to by the PC
1696 saved in frame_info. */
1697 pc
= get_pc_function_start (frame_info
->pc
);
1700 u
= find_unwind_entry (pc
);
1704 /* This is how much of a frame adjustment we need to account for. */
1705 stack_remaining
= u
->Total_frame_size
<< 3;
1707 /* Magic register saves we want to know about. */
1708 save_rp
= u
->Save_RP
;
1709 save_sp
= u
->Save_SP
;
1711 /* Turn the Entry_GR field into a bitmask. */
1713 for (i
= 3; i
< u
->Entry_GR
+ 3; i
++)
1715 /* Frame pointer gets saved into a special location. */
1716 if (u
->Save_SP
&& i
== FP_REGNUM
)
1719 save_gr
|= (1 << i
);
1722 /* Turn the Entry_FR field into a bitmask too. */
1724 for (i
= 12; i
< u
->Entry_FR
+ 12; i
++)
1725 save_fr
|= (1 << i
);
1727 /* The frame always represents the value of %sp at entry to the
1728 current function (and is thus equivalent to the "saved" stack
1730 frame_saved_regs
->regs
[SP_REGNUM
] = frame_info
->frame
;
1732 /* Loop until we find everything of interest or hit a branch.
1734 For unoptimized GCC code and for any HP CC code this will never ever
1735 examine any user instructions.
1737 For optimzied GCC code we're faced with problems. GCC will schedule
1738 its prologue and make prologue instructions available for delay slot
1739 filling. The end result is user code gets mixed in with the prologue
1740 and a prologue instruction may be in the delay slot of the first branch
1743 Some unexpected things are expected with debugging optimized code, so
1744 we allow this routine to walk past user instructions in optimized
1746 while (save_gr
|| save_fr
|| save_rp
|| save_sp
|| stack_remaining
> 0)
1748 status
= target_read_memory (pc
, buf
, 4);
1749 inst
= extract_unsigned_integer (buf
, 4);
1755 /* Note the interesting effects of this instruction. */
1756 stack_remaining
-= prologue_inst_adjust_sp (inst
);
1758 /* There is only one instruction used for saving RP into the stack. */
1759 if (inst
== 0x6bc23fd9)
1762 frame_saved_regs
->regs
[RP_REGNUM
] = frame_info
->frame
- 20;
1765 /* Just note that we found the save of SP into the stack. The
1766 value for frame_saved_regs was computed above. */
1767 if ((inst
& 0xffffc000) == 0x6fc10000)
1770 /* Account for general and floating-point register saves. */
1771 reg
= inst_saves_gr (inst
);
1772 if (reg
>= 3 && reg
<= 18
1773 && (!u
->Save_SP
|| reg
!= FP_REGNUM
))
1775 save_gr
&= ~(1 << reg
);
1777 /* stwm with a positive displacement is a *post modify*. */
1778 if ((inst
>> 26) == 0x1b
1779 && extract_14 (inst
) >= 0)
1780 frame_saved_regs
->regs
[reg
] = frame_info
->frame
;
1783 /* Handle code with and without frame pointers. */
1785 frame_saved_regs
->regs
[reg
]
1786 = frame_info
->frame
+ extract_14 (inst
);
1788 frame_saved_regs
->regs
[reg
]
1789 = frame_info
->frame
+ (u
->Total_frame_size
<< 3)
1790 + extract_14 (inst
);
1795 /* GCC handles callee saved FP regs a little differently.
1797 It emits an instruction to put the value of the start of
1798 the FP store area into %r1. It then uses fstds,ma with
1799 a basereg of %r1 for the stores.
1801 HP CC emits them at the current stack pointer modifying
1802 the stack pointer as it stores each register. */
1804 /* ldo X(%r3),%r1 or ldo X(%r30),%r1. */
1805 if ((inst
& 0xffffc000) == 0x34610000
1806 || (inst
& 0xffffc000) == 0x37c10000)
1807 fp_loc
= extract_14 (inst
);
1809 reg
= inst_saves_fr (inst
);
1810 if (reg
>= 12 && reg
<= 21)
1812 /* Note +4 braindamage below is necessary because the FP status
1813 registers are internally 8 registers rather than the expected
1815 save_fr
&= ~(1 << reg
);
1818 /* 1st HP CC FP register store. After this instruction
1819 we've set enough state that the GCC and HPCC code are
1820 both handled in the same manner. */
1821 frame_saved_regs
->regs
[reg
+ FP4_REGNUM
+ 4] = frame_info
->frame
;
1826 frame_saved_regs
->regs
[reg
+ FP0_REGNUM
+ 4]
1827 = frame_info
->frame
+ fp_loc
;
1832 /* Quit if we hit any kind of branch. This can happen if a prologue
1833 instruction is in the delay slot of the first call/branch. */
1834 if (is_branch (inst
))
1842 #ifdef MAINTENANCE_CMDS
1845 unwind_command (exp
, from_tty
)
1853 struct unwind_table_entry
*u
;
1856 /* If we have an expression, evaluate it and use it as the address. */
1858 if (exp
!= 0 && *exp
!= 0)
1859 address
= parse_and_eval_address (exp
);
1863 xxx
.u
= find_unwind_entry (address
);
1867 printf_unfiltered ("Can't find unwind table entry for PC 0x%x\n", address
);
1871 printf_unfiltered ("%08x\n%08X\n%08X\n%08X\n", xxx
.foo
[0], xxx
.foo
[1], xxx
.foo
[2],
1874 #endif /* MAINTENANCE_CMDS */
1877 _initialize_hppa_tdep ()
1879 #ifdef MAINTENANCE_CMDS
1880 add_cmd ("unwind", class_maintenance
, unwind_command
,
1881 "Print unwind table entry at given address.",
1882 &maintenanceprintlist
);
1883 #endif /* MAINTENANCE_CMDS */