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
);
1060 msymbol
= lookup_minimal_symbol ("$$dyncall", (struct objfile
*) NULL
);
1061 if (msymbol
== NULL
)
1062 error ("Can't find an address for $$dyncall trampoline");
1064 dyncall_addr
= SYMBOL_VALUE_ADDRESS (msymbol
);
1066 msymbol
= lookup_minimal_symbol ("_sr4export", (struct objfile
*) NULL
);
1067 if (msymbol
== NULL
)
1068 error ("Can't find an address for _sr4export trampoline");
1070 sr4export_addr
= SYMBOL_VALUE_ADDRESS (msymbol
);
1072 store_unsigned_integer
1073 (&dummy
[9*REGISTER_SIZE
],
1075 deposit_21 (fun
>> 11,
1076 extract_unsigned_integer (&dummy
[9*REGISTER_SIZE
],
1078 store_unsigned_integer
1079 (&dummy
[10*REGISTER_SIZE
],
1081 deposit_14 (fun
& MASK_11
,
1082 extract_unsigned_integer (&dummy
[10*REGISTER_SIZE
],
1084 store_unsigned_integer
1085 (&dummy
[12*REGISTER_SIZE
],
1087 deposit_21 (sr4export_addr
>> 11,
1088 extract_unsigned_integer (&dummy
[12*REGISTER_SIZE
],
1090 store_unsigned_integer
1091 (&dummy
[13*REGISTER_SIZE
],
1093 deposit_14 (sr4export_addr
& MASK_11
,
1094 extract_unsigned_integer (&dummy
[13*REGISTER_SIZE
],
1097 write_register (22, pc
);
1099 /* If we are in a syscall, then we should call the stack dummy
1100 directly. $$dyncall is not needed as the kernel sets up the
1101 space id registers properly based on the value in %r31. In
1102 fact calling $$dyncall will not work because the value in %r22
1103 will be clobbered on the syscall exit path. */
1107 return dyncall_addr
;
1111 /* Get the PC from %r31 if currently in a syscall. Also mask out privilege
1116 int flags
= read_register (FLAGS_REGNUM
);
1119 return read_register (31) & ~0x3;
1120 return read_register (PC_REGNUM
) & ~0x3;
1123 /* Write out the PC. If currently in a syscall, then also write the new
1124 PC value into %r31. */
1129 int flags
= read_register (FLAGS_REGNUM
);
1131 /* If in a syscall, then set %r31. Also make sure to get the
1132 privilege bits set correctly. */
1134 write_register (31, (long) (v
| 0x3));
1136 write_register (PC_REGNUM
, (long) v
);
1137 write_register (NPC_REGNUM
, (long) v
+ 4);
1140 /* return the alignment of a type in bytes. Structures have the maximum
1141 alignment required by their fields. */
1147 int max_align
, align
, i
;
1148 switch (TYPE_CODE (arg
))
1153 return TYPE_LENGTH (arg
);
1154 case TYPE_CODE_ARRAY
:
1155 return hppa_alignof (TYPE_FIELD_TYPE (arg
, 0));
1156 case TYPE_CODE_STRUCT
:
1157 case TYPE_CODE_UNION
:
1159 for (i
= 0; i
< TYPE_NFIELDS (arg
); i
++)
1161 /* Bit fields have no real alignment. */
1162 if (!TYPE_FIELD_BITPOS (arg
, i
))
1164 align
= hppa_alignof (TYPE_FIELD_TYPE (arg
, i
));
1165 max_align
= max (max_align
, align
);
1174 /* Print the register regnum, or all registers if regnum is -1 */
1176 pa_do_registers_info (regnum
, fpregs
)
1180 char raw_regs
[REGISTER_BYTES
];
1183 for (i
= 0; i
< NUM_REGS
; i
++)
1184 read_relative_register_raw_bytes (i
, raw_regs
+ REGISTER_BYTE (i
));
1186 pa_print_registers (raw_regs
, regnum
, fpregs
);
1187 else if (regnum
< FP0_REGNUM
)
1188 printf_unfiltered ("%s %x\n", reg_names
[regnum
], *(long *)(raw_regs
+
1189 REGISTER_BYTE (regnum
)));
1191 pa_print_fp_reg (regnum
);
1194 pa_print_registers (raw_regs
, regnum
, fpregs
)
1201 for (i
= 0; i
< 18; i
++)
1202 printf_unfiltered ("%8.8s: %8x %8.8s: %8x %8.8s: %8x %8.8s: %8x\n",
1204 *(int *)(raw_regs
+ REGISTER_BYTE (i
)),
1206 *(int *)(raw_regs
+ REGISTER_BYTE (i
+ 18)),
1208 *(int *)(raw_regs
+ REGISTER_BYTE (i
+ 36)),
1210 *(int *)(raw_regs
+ REGISTER_BYTE (i
+ 54)));
1213 for (i
= 72; i
< NUM_REGS
; i
++)
1214 pa_print_fp_reg (i
);
1220 unsigned char raw_buffer
[MAX_REGISTER_RAW_SIZE
];
1221 unsigned char virtual_buffer
[MAX_REGISTER_VIRTUAL_SIZE
];
1223 /* Get the data in raw format. */
1224 read_relative_register_raw_bytes (i
, raw_buffer
);
1226 /* Convert raw data to virtual format if necessary. */
1227 #ifdef REGISTER_CONVERTIBLE
1228 if (REGISTER_CONVERTIBLE (i
))
1230 REGISTER_CONVERT_TO_VIRTUAL (i
, REGISTER_VIRTUAL_TYPE (i
),
1231 raw_buffer
, virtual_buffer
);
1235 memcpy (virtual_buffer
, raw_buffer
,
1236 REGISTER_VIRTUAL_SIZE (i
));
1238 fputs_filtered (reg_names
[i
], gdb_stdout
);
1239 print_spaces_filtered (15 - strlen (reg_names
[i
]), gdb_stdout
);
1241 val_print (REGISTER_VIRTUAL_TYPE (i
), virtual_buffer
, 0, gdb_stdout
, 0,
1242 1, 0, Val_pretty_default
);
1243 printf_filtered ("\n");
1246 /* Function calls that pass into a new compilation unit must pass through a
1247 small piece of code that does long format (`external' in HPPA parlance)
1248 jumps. We figure out where the trampoline is going to end up, and return
1249 the PC of the final destination. If we aren't in a trampoline, we just
1252 For computed calls, we just extract the new PC from r22. */
1255 skip_trampoline_code (pc
, name
)
1260 static CORE_ADDR dyncall
= 0;
1261 struct minimal_symbol
*msym
;
1263 /* FIXME XXX - dyncall must be initialized whenever we get a new exec file */
1267 msym
= lookup_minimal_symbol ("$$dyncall", NULL
);
1269 dyncall
= SYMBOL_VALUE_ADDRESS (msym
);
1275 return (CORE_ADDR
)(read_register (22) & ~0x3);
1277 inst0
= read_memory_integer (pc
, 4);
1278 inst1
= read_memory_integer (pc
+4, 4);
1280 if ( (inst0
& 0xffe00000) == 0x20200000 /* ldil xxx, r1 */
1281 && (inst1
& 0xffe0e002) == 0xe0202002) /* be,n yyy(sr4, r1) */
1282 pc
= extract_21 (inst0
) + extract_17 (inst1
);
1284 pc
= (CORE_ADDR
)NULL
;
1289 /* For the given instruction (INST), return any adjustment it makes
1290 to the stack pointer or zero for no adjustment.
1292 This only handles instructions commonly found in prologues. */
1295 prologue_inst_adjust_sp (inst
)
1298 /* This must persist across calls. */
1299 static int save_high21
;
1301 /* The most common way to perform a stack adjustment ldo X(sp),sp */
1302 if ((inst
& 0xffffc000) == 0x37de0000)
1303 return extract_14 (inst
);
1306 if ((inst
& 0xffe00000) == 0x6fc00000)
1307 return extract_14 (inst
);
1309 /* addil high21,%r1; ldo low11,(%r1),%r30)
1310 save high bits in save_high21 for later use. */
1311 if ((inst
& 0xffe00000) == 0x28200000)
1313 save_high21
= extract_21 (inst
);
1317 if ((inst
& 0xffff0000) == 0x343e0000)
1318 return save_high21
+ extract_14 (inst
);
1320 /* fstws as used by the HP compilers. */
1321 if ((inst
& 0xffffffe0) == 0x2fd01220)
1322 return extract_5_load (inst
);
1324 /* No adjustment. */
1328 /* Return nonzero if INST is a branch of some kind, else return zero. */
1358 /* Return the register number for a GR which is saved by INST or
1359 zero it INST does not save a GR.
1361 Note we only care about full 32bit register stores (that's the only
1362 kind of stores the prologue will use). */
1365 inst_saves_gr (inst
)
1368 /* Does it look like a stw? */
1369 if ((inst
>> 26) == 0x1a)
1370 return extract_5R_store (inst
);
1372 /* Does it look like a stwm? */
1373 if ((inst
>> 26) == 0x1b)
1374 return extract_5R_store (inst
);
1379 /* Return the register number for a FR which is saved by INST or
1380 zero it INST does not save a FR.
1382 Note we only care about full 64bit register stores (that's the only
1383 kind of stores the prologue will use). */
1386 inst_saves_fr (inst
)
1389 if ((inst
& 0xfc1fffe0) == 0x2c101220)
1390 return extract_5r_store (inst
);
1394 /* Advance PC across any function entry prologue instructions
1395 to reach some "real" code.
1397 Use information in the unwind table to determine what exactly should
1398 be in the prologue. */
1405 unsigned long inst
, stack_remaining
, save_gr
, save_fr
, save_rp
, save_sp
;
1407 struct unwind_table_entry
*u
;
1409 u
= find_unwind_entry (pc
);
1413 /* This is how much of a frame adjustment we need to account for. */
1414 stack_remaining
= u
->Total_frame_size
<< 3;
1416 /* Magic register saves we want to know about. */
1417 save_rp
= u
->Save_RP
;
1418 save_sp
= u
->Save_SP
;
1420 /* Turn the Entry_GR field into a bitmask. */
1422 for (i
= 3; i
< u
->Entry_GR
+ 3; i
++)
1424 /* Frame pointer gets saved into a special location. */
1425 if (u
->Save_SP
&& i
== FP_REGNUM
)
1428 save_gr
|= (1 << i
);
1431 /* Turn the Entry_FR field into a bitmask too. */
1433 for (i
= 12; i
< u
->Entry_FR
+ 12; i
++)
1434 save_fr
|= (1 << i
);
1436 /* Loop until we find everything of interest or hit a branch.
1438 For unoptimized GCC code and for any HP CC code this will never ever
1439 examine any user instructions.
1441 For optimzied GCC code we're faced with problems. GCC will schedule
1442 its prologue and make prologue instructions available for delay slot
1443 filling. The end result is user code gets mixed in with the prologue
1444 and a prologue instruction may be in the delay slot of the first branch
1447 Some unexpected things are expected with debugging optimized code, so
1448 we allow this routine to walk past user instructions in optimized
1450 while (save_gr
|| save_fr
|| save_rp
|| save_sp
|| stack_remaining
> 0)
1452 status
= target_read_memory (pc
, buf
, 4);
1453 inst
= extract_unsigned_integer (buf
, 4);
1459 /* Note the interesting effects of this instruction. */
1460 stack_remaining
-= prologue_inst_adjust_sp (inst
);
1462 /* There is only one instruction used for saving RP into the stack. */
1463 if (inst
== 0x6bc23fd9)
1466 /* This is the only way we save SP into the stack. At this time
1467 the HP compilers never bother to save SP into the stack. */
1468 if ((inst
& 0xffffc000) == 0x6fc10000)
1471 /* Account for general and floating-point register saves. */
1472 save_gr
&= ~(1 << inst_saves_gr (inst
));
1473 save_fr
&= ~(1 << inst_saves_fr (inst
));
1475 /* Quit if we hit any kind of branch. This can happen if a prologue
1476 instruction is in the delay slot of the first call/branch. */
1477 if (is_branch (inst
))
1487 /* Put here the code to store, into a struct frame_saved_regs,
1488 the addresses of the saved registers of frame described by FRAME_INFO.
1489 This includes special registers such as pc and fp saved in special
1490 ways in the stack frame. sp is even more special:
1491 the address we return for it IS the sp for the next frame. */
1494 hppa_frame_find_saved_regs (frame_info
, frame_saved_regs
)
1495 struct frame_info
*frame_info
;
1496 struct frame_saved_regs
*frame_saved_regs
;
1499 struct unwind_table_entry
*u
;
1500 unsigned long inst
, stack_remaining
, save_gr
, save_fr
, save_rp
, save_sp
;
1505 /* Zero out everything. */
1506 memset (frame_saved_regs
, '\0', sizeof (struct frame_saved_regs
));
1508 /* Call dummy frames always look the same, so there's no need to
1509 examine the dummy code to determine locations of saved registers;
1510 instead, let find_dummy_frame_regs fill in the correct offsets
1511 for the saved registers. */
1512 if ((frame_info
->pc
>= frame_info
->frame
1513 && frame_info
->pc
<= (frame_info
->frame
+ CALL_DUMMY_LENGTH
1514 + 32 * 4 + (NUM_REGS
- FP0_REGNUM
) * 8
1516 find_dummy_frame_regs (frame_info
, frame_saved_regs
);
1518 /* Interrupt handlers are special too. They lay out the register
1519 state in the exact same order as the register numbers in GDB. */
1520 if (pc_in_interrupt_handler (frame_info
->pc
))
1522 for (i
= 0; i
< NUM_REGS
; i
++)
1524 /* SP is a little special. */
1526 frame_saved_regs
->regs
[SP_REGNUM
]
1527 = read_memory_integer (frame_info
->frame
+ SP_REGNUM
* 4, 4);
1529 frame_saved_regs
->regs
[i
] = frame_info
->frame
+ i
* 4;
1534 /* Handle signal handler callers. */
1535 if (frame_info
->signal_handler_caller
)
1537 FRAME_FIND_SAVED_REGS_IN_SIGTRAMP (frame_info
, frame_saved_regs
);
1541 /* Get the starting address of the function referred to by the PC
1542 saved in frame_info. */
1543 pc
= get_pc_function_start (frame_info
->pc
);
1546 u
= find_unwind_entry (pc
);
1550 /* This is how much of a frame adjustment we need to account for. */
1551 stack_remaining
= u
->Total_frame_size
<< 3;
1553 /* Magic register saves we want to know about. */
1554 save_rp
= u
->Save_RP
;
1555 save_sp
= u
->Save_SP
;
1557 /* Turn the Entry_GR field into a bitmask. */
1559 for (i
= 3; i
< u
->Entry_GR
+ 3; i
++)
1561 /* Frame pointer gets saved into a special location. */
1562 if (u
->Save_SP
&& i
== FP_REGNUM
)
1565 save_gr
|= (1 << i
);
1568 /* Turn the Entry_FR field into a bitmask too. */
1570 for (i
= 12; i
< u
->Entry_FR
+ 12; i
++)
1571 save_fr
|= (1 << i
);
1573 /* The frame always represents the value of %sp at entry to the
1574 current function (and is thus equivalent to the "saved" stack
1576 frame_saved_regs
->regs
[SP_REGNUM
] = frame_info
->frame
;
1578 /* Loop until we find everything of interest or hit a branch.
1580 For unoptimized GCC code and for any HP CC code this will never ever
1581 examine any user instructions.
1583 For optimzied GCC code we're faced with problems. GCC will schedule
1584 its prologue and make prologue instructions available for delay slot
1585 filling. The end result is user code gets mixed in with the prologue
1586 and a prologue instruction may be in the delay slot of the first branch
1589 Some unexpected things are expected with debugging optimized code, so
1590 we allow this routine to walk past user instructions in optimized
1592 while (save_gr
|| save_fr
|| save_rp
|| save_sp
|| stack_remaining
> 0)
1594 status
= target_read_memory (pc
, buf
, 4);
1595 inst
= extract_unsigned_integer (buf
, 4);
1601 /* Note the interesting effects of this instruction. */
1602 stack_remaining
-= prologue_inst_adjust_sp (inst
);
1604 /* There is only one instruction used for saving RP into the stack. */
1605 if (inst
== 0x6bc23fd9)
1608 frame_saved_regs
->regs
[RP_REGNUM
] = frame_info
->frame
- 20;
1611 /* Just note that we found the save of SP into the stack. The
1612 value for frame_saved_regs was computed above. */
1613 if ((inst
& 0xffffc000) == 0x6fc10000)
1616 /* Account for general and floating-point register saves. */
1617 reg
= inst_saves_gr (inst
);
1618 if (reg
>= 3 && reg
<= 18
1619 && (!u
->Save_SP
|| reg
!= FP_REGNUM
))
1621 save_gr
&= ~(1 << reg
);
1623 /* stwm with a positive displacement is a *post modify*. */
1624 if ((inst
>> 26) == 0x1b
1625 && extract_14 (inst
) >= 0)
1626 frame_saved_regs
->regs
[reg
] = frame_info
->frame
;
1629 /* Handle code with and without frame pointers. */
1631 frame_saved_regs
->regs
[reg
]
1632 = frame_info
->frame
+ extract_14 (inst
);
1634 frame_saved_regs
->regs
[reg
]
1635 = frame_info
->frame
+ (u
->Total_frame_size
<< 3)
1636 + extract_14 (inst
);
1641 /* GCC handles callee saved FP regs a little differently.
1643 It emits an instruction to put the value of the start of
1644 the FP store area into %r1. It then uses fstds,ma with
1645 a basereg of %r1 for the stores.
1647 HP CC emits them at the current stack pointer modifying
1648 the stack pointer as it stores each register. */
1650 /* ldo X(%r3),%r1 or ldo X(%r30),%r1. */
1651 if ((inst
& 0xffffc000) == 0x34610000
1652 || (inst
& 0xffffc000) == 0x37c10000)
1653 fp_loc
= extract_14 (inst
);
1655 reg
= inst_saves_fr (inst
);
1656 if (reg
>= 12 && reg
<= 21)
1658 /* Note +4 braindamage below is necessary because the FP status
1659 registers are internally 8 registers rather than the expected
1661 save_fr
&= ~(1 << reg
);
1664 /* 1st HP CC FP register store. After this instruction
1665 we've set enough state that the GCC and HPCC code are
1666 both handled in the same manner. */
1667 frame_saved_regs
->regs
[reg
+ FP4_REGNUM
+ 4] = frame_info
->frame
;
1672 frame_saved_regs
->regs
[reg
+ FP0_REGNUM
+ 4]
1673 = frame_info
->frame
+ fp_loc
;
1678 /* Quit if we hit any kind of branch. This can happen if a prologue
1679 instruction is in the delay slot of the first call/branch. */
1680 if (is_branch (inst
))
1688 #ifdef MAINTENANCE_CMDS
1691 unwind_command (exp
, from_tty
)
1699 struct unwind_table_entry
*u
;
1702 /* If we have an expression, evaluate it and use it as the address. */
1704 if (exp
!= 0 && *exp
!= 0)
1705 address
= parse_and_eval_address (exp
);
1709 xxx
.u
= find_unwind_entry (address
);
1713 printf_unfiltered ("Can't find unwind table entry for PC 0x%x\n", address
);
1717 printf_unfiltered ("%08x\n%08X\n%08X\n%08X\n", xxx
.foo
[0], xxx
.foo
[1], xxx
.foo
[2],
1720 #endif /* MAINTENANCE_CMDS */
1723 _initialize_hppa_tdep ()
1725 #ifdef MAINTENANCE_CMDS
1726 add_cmd ("unwind", class_maintenance
, unwind_command
,
1727 "Print unwind table entry at given address.",
1728 &maintenanceprintlist
);
1729 #endif /* MAINTENANCE_CMDS */