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 if (fsr
.regs
[IPSW_REGNUM
]) /* Restoring a call dummy frame */
895 restore_pc_queue (&fsr
);
897 for (regnum
= 31; regnum
> 0; regnum
--)
898 if (fsr
.regs
[regnum
])
899 write_register (regnum
, read_memory_integer (fsr
.regs
[regnum
], 4));
901 for (regnum
= NUM_REGS
- 1; regnum
>= FP0_REGNUM
; regnum
--)
902 if (fsr
.regs
[regnum
])
904 read_memory (fsr
.regs
[regnum
], (char *)&freg_buffer
, 8);
905 write_register_bytes (REGISTER_BYTE (regnum
), (char *)&freg_buffer
, 8);
908 if (fsr
.regs
[IPSW_REGNUM
])
909 write_register (IPSW_REGNUM
,
910 read_memory_integer (fsr
.regs
[IPSW_REGNUM
], 4));
912 if (fsr
.regs
[SAR_REGNUM
])
913 write_register (SAR_REGNUM
,
914 read_memory_integer (fsr
.regs
[SAR_REGNUM
], 4));
916 /* If the PC was explicitly saved, then just restore it. */
917 if (fsr
.regs
[PCOQ_TAIL_REGNUM
])
918 write_register (PCOQ_TAIL_REGNUM
,
919 read_memory_integer (fsr
.regs
[PCOQ_TAIL_REGNUM
], 4));
921 /* Else use the value in %rp to set the new PC. */
923 target_write_pc (read_register (RP_REGNUM
));
925 write_register (FP_REGNUM
, read_memory_integer (fp
, 4));
927 if (fsr
.regs
[IPSW_REGNUM
]) /* call dummy */
928 write_register (SP_REGNUM
, fp
- 48);
930 write_register (SP_REGNUM
, fp
);
932 flush_cached_frames ();
933 set_current_frame (create_new_frame (read_register (FP_REGNUM
),
938 * After returning to a dummy on the stack, restore the instruction
939 * queue space registers. */
942 restore_pc_queue (fsr
)
943 struct frame_saved_regs
*fsr
;
945 CORE_ADDR pc
= read_pc ();
946 CORE_ADDR new_pc
= read_memory_integer (fsr
->regs
[PCOQ_HEAD_REGNUM
], 4);
948 struct target_waitstatus w
;
951 /* Advance past break instruction in the call dummy. */
952 write_register (PCOQ_HEAD_REGNUM
, pc
+ 4);
953 write_register (PCOQ_TAIL_REGNUM
, pc
+ 8);
956 * HPUX doesn't let us set the space registers or the space
957 * registers of the PC queue through ptrace. Boo, hiss.
958 * Conveniently, the call dummy has this sequence of instructions
963 * So, load up the registers and single step until we are in the
967 write_register (21, read_memory_integer (fsr
->regs
[PCSQ_HEAD_REGNUM
], 4));
968 write_register (22, new_pc
);
970 for (insn_count
= 0; insn_count
< 3; insn_count
++)
972 /* FIXME: What if the inferior gets a signal right now? Want to
973 merge this into wait_for_inferior (as a special kind of
974 watchpoint? By setting a breakpoint at the end? Is there
975 any other choice? Is there *any* way to do this stuff with
976 ptrace() or some equivalent?). */
978 target_wait (inferior_pid
, &w
);
980 if (w
.kind
== TARGET_WAITKIND_SIGNALLED
)
982 stop_signal
= w
.value
.sig
;
983 terminal_ours_for_output ();
984 printf_unfiltered ("\nProgram terminated with signal %s, %s.\n",
985 target_signal_to_name (stop_signal
),
986 target_signal_to_string (stop_signal
));
987 gdb_flush (gdb_stdout
);
991 target_terminal_ours ();
992 fetch_inferior_registers (-1);
997 hppa_push_arguments (nargs
, args
, sp
, struct_return
, struct_addr
)
1002 CORE_ADDR struct_addr
;
1004 /* array of arguments' offsets */
1005 int *offset
= (int *)alloca(nargs
* sizeof (int));
1009 for (i
= 0; i
< nargs
; i
++)
1011 /* Coerce chars to int & float to double if necessary */
1012 args
[i
] = value_arg_coerce (args
[i
]);
1014 cum
+= TYPE_LENGTH (VALUE_TYPE (args
[i
]));
1016 /* value must go at proper alignment. Assume alignment is a
1018 alignment
= hppa_alignof (VALUE_TYPE (args
[i
]));
1019 if (cum
% alignment
)
1020 cum
= (cum
+ alignment
) & -alignment
;
1023 sp
+= max ((cum
+ 7) & -8, 16);
1025 for (i
= 0; i
< nargs
; i
++)
1026 write_memory (sp
+ offset
[i
], VALUE_CONTENTS (args
[i
]),
1027 TYPE_LENGTH (VALUE_TYPE (args
[i
])));
1030 write_register (28, struct_addr
);
1035 * Insert the specified number of args and function address
1036 * into a call sequence of the above form stored at DUMMYNAME.
1038 * On the hppa we need to call the stack dummy through $$dyncall.
1039 * Therefore our version of FIX_CALL_DUMMY takes an extra argument,
1040 * real_pc, which is the location where gdb should start up the
1041 * inferior to do the function call.
1045 hppa_fix_call_dummy (dummy
, pc
, fun
, nargs
, args
, type
, gcc_p
)
1054 CORE_ADDR dyncall_addr
, sr4export_addr
;
1055 struct minimal_symbol
*msymbol
;
1056 int flags
= read_register (FLAGS_REGNUM
);
1058 msymbol
= lookup_minimal_symbol ("$$dyncall", (struct objfile
*) NULL
);
1059 if (msymbol
== NULL
)
1060 error ("Can't find an address for $$dyncall trampoline");
1062 dyncall_addr
= SYMBOL_VALUE_ADDRESS (msymbol
);
1064 msymbol
= lookup_minimal_symbol ("_sr4export", (struct objfile
*) NULL
);
1065 if (msymbol
== NULL
)
1066 error ("Can't find an address for _sr4export trampoline");
1068 sr4export_addr
= SYMBOL_VALUE_ADDRESS (msymbol
);
1070 store_unsigned_integer
1071 (&dummy
[9*REGISTER_SIZE
],
1073 deposit_21 (fun
>> 11,
1074 extract_unsigned_integer (&dummy
[9*REGISTER_SIZE
],
1076 store_unsigned_integer
1077 (&dummy
[10*REGISTER_SIZE
],
1079 deposit_14 (fun
& MASK_11
,
1080 extract_unsigned_integer (&dummy
[10*REGISTER_SIZE
],
1082 store_unsigned_integer
1083 (&dummy
[12*REGISTER_SIZE
],
1085 deposit_21 (sr4export_addr
>> 11,
1086 extract_unsigned_integer (&dummy
[12*REGISTER_SIZE
],
1088 store_unsigned_integer
1089 (&dummy
[13*REGISTER_SIZE
],
1091 deposit_14 (sr4export_addr
& MASK_11
,
1092 extract_unsigned_integer (&dummy
[13*REGISTER_SIZE
],
1095 write_register (22, pc
);
1097 /* If we are in a syscall, then we should call the stack dummy
1098 directly. $$dyncall is not needed as the kernel sets up the
1099 space id registers properly based on the value in %r31. In
1100 fact calling $$dyncall will not work because the value in %r22
1101 will be clobbered on the syscall exit path. */
1105 return dyncall_addr
;
1109 /* Get the PC from %r31 if currently in a syscall. Also mask out privilege
1114 int flags
= read_register (FLAGS_REGNUM
);
1117 return read_register (31) & ~0x3;
1118 return read_register (PC_REGNUM
) & ~0x3;
1121 /* Write out the PC. If currently in a syscall, then also write the new
1122 PC value into %r31. */
1127 int flags
= read_register (FLAGS_REGNUM
);
1129 /* If in a syscall, then set %r31. Also make sure to get the
1130 privilege bits set correctly. */
1132 write_register (31, (long) (v
| 0x3));
1134 write_register (PC_REGNUM
, (long) v
);
1135 write_register (NPC_REGNUM
, (long) v
+ 4);
1138 /* return the alignment of a type in bytes. Structures have the maximum
1139 alignment required by their fields. */
1145 int max_align
, align
, i
;
1146 switch (TYPE_CODE (arg
))
1151 return TYPE_LENGTH (arg
);
1152 case TYPE_CODE_ARRAY
:
1153 return hppa_alignof (TYPE_FIELD_TYPE (arg
, 0));
1154 case TYPE_CODE_STRUCT
:
1155 case TYPE_CODE_UNION
:
1157 for (i
= 0; i
< TYPE_NFIELDS (arg
); i
++)
1159 /* Bit fields have no real alignment. */
1160 if (!TYPE_FIELD_BITPOS (arg
, i
))
1162 align
= hppa_alignof (TYPE_FIELD_TYPE (arg
, i
));
1163 max_align
= max (max_align
, align
);
1172 /* Print the register regnum, or all registers if regnum is -1 */
1174 pa_do_registers_info (regnum
, fpregs
)
1178 char raw_regs
[REGISTER_BYTES
];
1181 for (i
= 0; i
< NUM_REGS
; i
++)
1182 read_relative_register_raw_bytes (i
, raw_regs
+ REGISTER_BYTE (i
));
1184 pa_print_registers (raw_regs
, regnum
, fpregs
);
1185 else if (regnum
< FP0_REGNUM
)
1186 printf_unfiltered ("%s %x\n", reg_names
[regnum
], *(long *)(raw_regs
+
1187 REGISTER_BYTE (regnum
)));
1189 pa_print_fp_reg (regnum
);
1192 pa_print_registers (raw_regs
, regnum
, fpregs
)
1199 for (i
= 0; i
< 18; i
++)
1200 printf_unfiltered ("%8.8s: %8x %8.8s: %8x %8.8s: %8x %8.8s: %8x\n",
1202 *(int *)(raw_regs
+ REGISTER_BYTE (i
)),
1204 *(int *)(raw_regs
+ REGISTER_BYTE (i
+ 18)),
1206 *(int *)(raw_regs
+ REGISTER_BYTE (i
+ 36)),
1208 *(int *)(raw_regs
+ REGISTER_BYTE (i
+ 54)));
1211 for (i
= 72; i
< NUM_REGS
; i
++)
1212 pa_print_fp_reg (i
);
1218 unsigned char raw_buffer
[MAX_REGISTER_RAW_SIZE
];
1219 unsigned char virtual_buffer
[MAX_REGISTER_VIRTUAL_SIZE
];
1221 /* Get the data in raw format. */
1222 read_relative_register_raw_bytes (i
, raw_buffer
);
1224 /* Convert raw data to virtual format if necessary. */
1225 #ifdef REGISTER_CONVERTIBLE
1226 if (REGISTER_CONVERTIBLE (i
))
1228 REGISTER_CONVERT_TO_VIRTUAL (i
, REGISTER_VIRTUAL_TYPE (i
),
1229 raw_buffer
, virtual_buffer
);
1233 memcpy (virtual_buffer
, raw_buffer
,
1234 REGISTER_VIRTUAL_SIZE (i
));
1236 fputs_filtered (reg_names
[i
], gdb_stdout
);
1237 print_spaces_filtered (15 - strlen (reg_names
[i
]), gdb_stdout
);
1239 val_print (REGISTER_VIRTUAL_TYPE (i
), virtual_buffer
, 0, gdb_stdout
, 0,
1240 1, 0, Val_pretty_default
);
1241 printf_filtered ("\n");
1244 /* Function calls that pass into a new compilation unit must pass through a
1245 small piece of code that does long format (`external' in HPPA parlance)
1246 jumps. We figure out where the trampoline is going to end up, and return
1247 the PC of the final destination. If we aren't in a trampoline, we just
1250 For computed calls, we just extract the new PC from r22. */
1253 skip_trampoline_code (pc
, name
)
1258 static CORE_ADDR dyncall
= 0;
1259 struct minimal_symbol
*msym
;
1261 /* FIXME XXX - dyncall must be initialized whenever we get a new exec file */
1265 msym
= lookup_minimal_symbol ("$$dyncall", NULL
);
1267 dyncall
= SYMBOL_VALUE_ADDRESS (msym
);
1273 return (CORE_ADDR
)(read_register (22) & ~0x3);
1275 inst0
= read_memory_integer (pc
, 4);
1276 inst1
= read_memory_integer (pc
+4, 4);
1278 if ( (inst0
& 0xffe00000) == 0x20200000 /* ldil xxx, r1 */
1279 && (inst1
& 0xffe0e002) == 0xe0202002) /* be,n yyy(sr4, r1) */
1280 pc
= extract_21 (inst0
) + extract_17 (inst1
);
1282 pc
= (CORE_ADDR
)NULL
;
1287 /* For the given instruction (INST), return any adjustment it makes
1288 to the stack pointer or zero for no adjustment.
1290 This only handles instructions commonly found in prologues. */
1293 prologue_inst_adjust_sp (inst
)
1296 /* This must persist across calls. */
1297 static int save_high21
;
1299 /* The most common way to perform a stack adjustment ldo X(sp),sp */
1300 if ((inst
& 0xffffc000) == 0x37de0000)
1301 return extract_14 (inst
);
1304 if ((inst
& 0xffe00000) == 0x6fc00000)
1305 return extract_14 (inst
);
1307 /* addil high21,%r1; ldo low11,(%r1),%r30)
1308 save high bits in save_high21 for later use. */
1309 if ((inst
& 0xffe00000) == 0x28200000)
1311 save_high21
= extract_21 (inst
);
1315 if ((inst
& 0xffff0000) == 0x343e0000)
1316 return save_high21
+ extract_14 (inst
);
1318 /* fstws as used by the HP compilers. */
1319 if ((inst
& 0xffffffe0) == 0x2fd01220)
1320 return extract_5_load (inst
);
1322 /* No adjustment. */
1326 /* Return nonzero if INST is a branch of some kind, else return zero. */
1356 /* Return the register number for a GR which is saved by INST or
1357 zero it INST does not save a GR.
1359 Note we only care about full 32bit register stores (that's the only
1360 kind of stores the prologue will use). */
1363 inst_saves_gr (inst
)
1366 /* Does it look like a stw? */
1367 if ((inst
>> 26) == 0x1a)
1368 return extract_5R_store (inst
);
1370 /* Does it look like a stwm? */
1371 if ((inst
>> 26) == 0x1b)
1372 return extract_5R_store (inst
);
1377 /* Return the register number for a FR which is saved by INST or
1378 zero it INST does not save a FR.
1380 Note we only care about full 64bit register stores (that's the only
1381 kind of stores the prologue will use). */
1384 inst_saves_fr (inst
)
1387 if ((inst
& 0xfc1fffe0) == 0x2c101220)
1388 return extract_5r_store (inst
);
1392 /* Advance PC across any function entry prologue instructions
1393 to reach some "real" code.
1395 Use information in the unwind table to determine what exactly should
1396 be in the prologue. */
1403 unsigned long inst
, stack_remaining
, save_gr
, save_fr
, save_rp
, save_sp
;
1405 struct unwind_table_entry
*u
;
1407 u
= find_unwind_entry (pc
);
1411 /* This is how much of a frame adjustment we need to account for. */
1412 stack_remaining
= u
->Total_frame_size
<< 3;
1414 /* Magic register saves we want to know about. */
1415 save_rp
= u
->Save_RP
;
1416 save_sp
= u
->Save_SP
;
1418 /* Turn the Entry_GR field into a bitmask. */
1420 for (i
= 3; i
< u
->Entry_GR
+ 3; i
++)
1422 /* Frame pointer gets saved into a special location. */
1423 if (u
->Save_SP
&& i
== FP_REGNUM
)
1426 save_gr
|= (1 << i
);
1429 /* Turn the Entry_FR field into a bitmask too. */
1431 for (i
= 12; i
< u
->Entry_FR
+ 12; i
++)
1432 save_fr
|= (1 << i
);
1434 /* Loop until we find everything of interest or hit a branch.
1436 For unoptimized GCC code and for any HP CC code this will never ever
1437 examine any user instructions.
1439 For optimzied GCC code we're faced with problems. GCC will schedule
1440 its prologue and make prologue instructions available for delay slot
1441 filling. The end result is user code gets mixed in with the prologue
1442 and a prologue instruction may be in the delay slot of the first branch
1445 Some unexpected things are expected with debugging optimized code, so
1446 we allow this routine to walk past user instructions in optimized
1448 while (save_gr
|| save_fr
|| save_rp
|| save_sp
|| stack_remaining
> 0)
1450 status
= target_read_memory (pc
, buf
, 4);
1451 inst
= extract_unsigned_integer (buf
, 4);
1457 /* Note the interesting effects of this instruction. */
1458 stack_remaining
-= prologue_inst_adjust_sp (inst
);
1460 /* There is only one instruction used for saving RP into the stack. */
1461 if (inst
== 0x6bc23fd9)
1464 /* This is the only way we save SP into the stack. At this time
1465 the HP compilers never bother to save SP into the stack. */
1466 if ((inst
& 0xffffc000) == 0x6fc10000)
1469 /* Account for general and floating-point register saves. */
1470 save_gr
&= ~(1 << inst_saves_gr (inst
));
1471 save_fr
&= ~(1 << inst_saves_fr (inst
));
1473 /* Quit if we hit any kind of branch. This can happen if a prologue
1474 instruction is in the delay slot of the first call/branch. */
1475 if (is_branch (inst
))
1485 /* Put here the code to store, into a struct frame_saved_regs,
1486 the addresses of the saved registers of frame described by FRAME_INFO.
1487 This includes special registers such as pc and fp saved in special
1488 ways in the stack frame. sp is even more special:
1489 the address we return for it IS the sp for the next frame. */
1492 hppa_frame_find_saved_regs (frame_info
, frame_saved_regs
)
1493 struct frame_info
*frame_info
;
1494 struct frame_saved_regs
*frame_saved_regs
;
1497 struct unwind_table_entry
*u
;
1498 unsigned long inst
, stack_remaining
, save_gr
, save_fr
, save_rp
, save_sp
;
1503 /* Zero out everything. */
1504 memset (frame_saved_regs
, '\0', sizeof (struct frame_saved_regs
));
1506 /* Call dummy frames always look the same, so there's no need to
1507 examine the dummy code to determine locations of saved registers;
1508 instead, let find_dummy_frame_regs fill in the correct offsets
1509 for the saved registers. */
1510 if ((frame_info
->pc
>= frame_info
->frame
1511 && frame_info
->pc
<= (frame_info
->frame
+ CALL_DUMMY_LENGTH
1512 + 32 * 4 + (NUM_REGS
- FP0_REGNUM
) * 8
1514 find_dummy_frame_regs (frame_info
, frame_saved_regs
);
1516 /* Interrupt handlers are special too. They lay out the register
1517 state in the exact same order as the register numbers in GDB. */
1518 if (pc_in_interrupt_handler (frame_info
->pc
))
1520 for (i
= 0; i
< NUM_REGS
; i
++)
1522 /* SP is a little special. */
1524 frame_saved_regs
->regs
[SP_REGNUM
]
1525 = read_memory_integer (frame_info
->frame
+ SP_REGNUM
* 4, 4);
1527 frame_saved_regs
->regs
[i
] = frame_info
->frame
+ i
* 4;
1532 /* Handle signal handler callers. */
1533 if (frame_info
->signal_handler_caller
)
1535 FRAME_FIND_SAVED_REGS_IN_SIGTRAMP (frame_info
, frame_saved_regs
);
1539 /* Get the starting address of the function referred to by the PC
1540 saved in frame_info. */
1541 pc
= get_pc_function_start (frame_info
->pc
);
1544 u
= find_unwind_entry (pc
);
1548 /* This is how much of a frame adjustment we need to account for. */
1549 stack_remaining
= u
->Total_frame_size
<< 3;
1551 /* Magic register saves we want to know about. */
1552 save_rp
= u
->Save_RP
;
1553 save_sp
= u
->Save_SP
;
1555 /* Turn the Entry_GR field into a bitmask. */
1557 for (i
= 3; i
< u
->Entry_GR
+ 3; i
++)
1559 /* Frame pointer gets saved into a special location. */
1560 if (u
->Save_SP
&& i
== FP_REGNUM
)
1563 save_gr
|= (1 << i
);
1566 /* Turn the Entry_FR field into a bitmask too. */
1568 for (i
= 12; i
< u
->Entry_FR
+ 12; i
++)
1569 save_fr
|= (1 << i
);
1571 /* The frame always represents the value of %sp at entry to the
1572 current function (and is thus equivalent to the "saved" stack
1574 frame_saved_regs
->regs
[SP_REGNUM
] = frame_info
->frame
;
1576 /* Loop until we find everything of interest or hit a branch.
1578 For unoptimized GCC code and for any HP CC code this will never ever
1579 examine any user instructions.
1581 For optimzied GCC code we're faced with problems. GCC will schedule
1582 its prologue and make prologue instructions available for delay slot
1583 filling. The end result is user code gets mixed in with the prologue
1584 and a prologue instruction may be in the delay slot of the first branch
1587 Some unexpected things are expected with debugging optimized code, so
1588 we allow this routine to walk past user instructions in optimized
1590 while (save_gr
|| save_fr
|| save_rp
|| save_sp
|| stack_remaining
> 0)
1592 status
= target_read_memory (pc
, buf
, 4);
1593 inst
= extract_unsigned_integer (buf
, 4);
1599 /* Note the interesting effects of this instruction. */
1600 stack_remaining
-= prologue_inst_adjust_sp (inst
);
1602 /* There is only one instruction used for saving RP into the stack. */
1603 if (inst
== 0x6bc23fd9)
1606 frame_saved_regs
->regs
[RP_REGNUM
] = frame_info
->frame
- 20;
1609 /* Just note that we found the save of SP into the stack. The
1610 value for frame_saved_regs was computed above. */
1611 if ((inst
& 0xffffc000) == 0x6fc10000)
1614 /* Account for general and floating-point register saves. */
1615 reg
= inst_saves_gr (inst
);
1616 if (reg
>= 3 && reg
<= 18
1617 && (!u
->Save_SP
|| reg
!= FP_REGNUM
))
1619 save_gr
&= ~(1 << reg
);
1621 /* stwm with a positive displacement is a *post modify*. */
1622 if ((inst
>> 26) == 0x1b
1623 && extract_14 (inst
) >= 0)
1624 frame_saved_regs
->regs
[reg
] = frame_info
->frame
;
1627 /* Handle code with and without frame pointers. */
1629 frame_saved_regs
->regs
[reg
]
1630 = frame_info
->frame
+ extract_14 (inst
);
1632 frame_saved_regs
->regs
[reg
]
1633 = frame_info
->frame
+ (u
->Total_frame_size
<< 3)
1634 + extract_14 (inst
);
1639 /* GCC handles callee saved FP regs a little differently.
1641 It emits an instruction to put the value of the start of
1642 the FP store area into %r1. It then uses fstds,ma with
1643 a basereg of %r1 for the stores.
1645 HP CC emits them at the current stack pointer modifying
1646 the stack pointer as it stores each register. */
1648 /* ldo X(%r3),%r1 or ldo X(%r30),%r1. */
1649 if ((inst
& 0xffffc000) == 0x34610000
1650 || (inst
& 0xffffc000) == 0x37c10000)
1651 fp_loc
= extract_14 (inst
);
1653 reg
= inst_saves_fr (inst
);
1654 if (reg
>= 12 && reg
<= 21)
1656 /* Note +4 braindamage below is necessary because the FP status
1657 registers are internally 8 registers rather than the expected
1659 save_fr
&= ~(1 << reg
);
1662 /* 1st HP CC FP register store. After this instruction
1663 we've set enough state that the GCC and HPCC code are
1664 both handled in the same manner. */
1665 frame_saved_regs
->regs
[reg
+ FP4_REGNUM
+ 4] = frame_info
->frame
;
1670 frame_saved_regs
->regs
[reg
+ FP0_REGNUM
+ 4]
1671 = frame_info
->frame
+ fp_loc
;
1676 /* Quit if we hit any kind of branch. This can happen if a prologue
1677 instruction is in the delay slot of the first call/branch. */
1678 if (is_branch (inst
))
1686 #ifdef MAINTENANCE_CMDS
1689 unwind_command (exp
, from_tty
)
1697 struct unwind_table_entry
*u
;
1700 /* If we have an expression, evaluate it and use it as the address. */
1702 if (exp
!= 0 && *exp
!= 0)
1703 address
= parse_and_eval_address (exp
);
1707 xxx
.u
= find_unwind_entry (address
);
1711 printf_unfiltered ("Can't find unwind table entry for PC 0x%x\n", address
);
1715 printf_unfiltered ("%08x\n%08X\n%08X\n%08X\n", xxx
.foo
[0], xxx
.foo
[1], xxx
.foo
[2],
1718 #endif /* MAINTENANCE_CMDS */
1721 _initialize_hppa_tdep ()
1723 #ifdef MAINTENANCE_CMDS
1724 add_cmd ("unwind", class_maintenance
, unwind_command
,
1725 "Print unwind table entry at given address.",
1726 &maintenanceprintlist
);
1727 #endif /* MAINTENANCE_CMDS */