1 /* Native support for the SGI Iris running IRIX version 5, for GDB.
2 Copyright 1988, 89, 90, 91, 92, 93, 94, 95, 96, 98, 1999
3 Free Software Foundation, Inc.
4 Contributed by Alessandro Forin(af@cs.cmu.edu) at CMU
5 and by Per Bothner(bothner@cs.wisc.edu) at U.Wisconsin.
6 Implemented for Irix 4.x by Garrett A. Wollman.
7 Modified for Irix 5.x by Ian Lance Taylor.
9 This file is part of GDB.
11 This program is free software; you can redistribute it and/or modify
12 it under the terms of the GNU General Public License as published by
13 the Free Software Foundation; either version 2 of the License, or
14 (at your option) any later version.
16 This program is distributed in the hope that it will be useful,
17 but WITHOUT ANY WARRANTY; without even the implied warranty of
18 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 GNU General Public License for more details.
21 You should have received a copy of the GNU General Public License
22 along with this program; if not, write to the Free Software
23 Foundation, Inc., 59 Temple Place - Suite 330,
24 Boston, MA 02111-1307, USA. */
31 #include "gdb_string.h"
33 #include <sys/procfs.h>
34 #include <setjmp.h> /* For JB_XXX. */
36 /* Prototypes for supply_gregset etc. */
39 static void fetch_core_registers (char *, unsigned int, int, CORE_ADDR
);
41 /* Size of elements in jmpbuf */
43 #define JB_ELEMENT_SIZE 4
46 * See the comment in m68k-tdep.c regarding the utility of these functions.
48 * These definitions are from the MIPS SVR4 ABI, so they may work for
49 * any MIPS SVR4 target.
53 supply_gregset (gregsetp
)
57 register greg_t
*regp
= &(*gregsetp
)[0];
58 int gregoff
= sizeof (greg_t
) - MIPS_REGSIZE
;
59 static char zerobuf
[MAX_REGISTER_RAW_SIZE
] =
62 for (regi
= 0; regi
<= CTX_RA
; regi
++)
63 supply_register (regi
, (char *) (regp
+ regi
) + gregoff
);
65 supply_register (PC_REGNUM
, (char *) (regp
+ CTX_EPC
) + gregoff
);
66 supply_register (HI_REGNUM
, (char *) (regp
+ CTX_MDHI
) + gregoff
);
67 supply_register (LO_REGNUM
, (char *) (regp
+ CTX_MDLO
) + gregoff
);
68 supply_register (CAUSE_REGNUM
, (char *) (regp
+ CTX_CAUSE
) + gregoff
);
70 /* Fill inaccessible registers with zero. */
71 supply_register (BADVADDR_REGNUM
, zerobuf
);
75 fill_gregset (gregsetp
, regno
)
80 register greg_t
*regp
= &(*gregsetp
)[0];
82 /* Under Irix6, if GDB is built with N32 ABI and is debugging an O32
83 executable, we have to sign extend the registers to 64 bits before
84 filling in the gregset structure. */
86 for (regi
= 0; regi
<= CTX_RA
; regi
++)
87 if ((regno
== -1) || (regno
== regi
))
89 extract_signed_integer (®isters
[REGISTER_BYTE (regi
)],
90 REGISTER_RAW_SIZE (regi
));
92 if ((regno
== -1) || (regno
== PC_REGNUM
))
94 extract_signed_integer (®isters
[REGISTER_BYTE (PC_REGNUM
)],
95 REGISTER_RAW_SIZE (PC_REGNUM
));
97 if ((regno
== -1) || (regno
== CAUSE_REGNUM
))
99 extract_signed_integer (®isters
[REGISTER_BYTE (CAUSE_REGNUM
)],
100 REGISTER_RAW_SIZE (CAUSE_REGNUM
));
102 if ((regno
== -1) || (regno
== HI_REGNUM
))
104 extract_signed_integer (®isters
[REGISTER_BYTE (HI_REGNUM
)],
105 REGISTER_RAW_SIZE (HI_REGNUM
));
107 if ((regno
== -1) || (regno
== LO_REGNUM
))
109 extract_signed_integer (®isters
[REGISTER_BYTE (LO_REGNUM
)],
110 REGISTER_RAW_SIZE (LO_REGNUM
));
114 * Now we do the same thing for floating-point registers.
115 * We don't bother to condition on FP0_REGNUM since any
116 * reasonable MIPS configuration has an R3010 in it.
118 * Again, see the comments in m68k-tdep.c.
122 supply_fpregset (fpregsetp
)
123 fpregset_t
*fpregsetp
;
126 static char zerobuf
[MAX_REGISTER_RAW_SIZE
] =
129 /* FIXME, this is wrong for the N32 ABI which has 64 bit FP regs. */
131 for (regi
= 0; regi
< 32; regi
++)
132 supply_register (FP0_REGNUM
+ regi
,
133 (char *) &fpregsetp
->fp_r
.fp_regs
[regi
]);
135 supply_register (FCRCS_REGNUM
, (char *) &fpregsetp
->fp_csr
);
137 /* FIXME: how can we supply FCRIR_REGNUM? SGI doesn't tell us. */
138 supply_register (FCRIR_REGNUM
, zerobuf
);
142 fill_fpregset (fpregsetp
, regno
)
143 fpregset_t
*fpregsetp
;
149 /* FIXME, this is wrong for the N32 ABI which has 64 bit FP regs. */
151 for (regi
= FP0_REGNUM
; regi
< FP0_REGNUM
+ 32; regi
++)
153 if ((regno
== -1) || (regno
== regi
))
155 from
= (char *) ®isters
[REGISTER_BYTE (regi
)];
156 to
= (char *) &(fpregsetp
->fp_r
.fp_regs
[regi
- FP0_REGNUM
]);
157 memcpy (to
, from
, REGISTER_RAW_SIZE (regi
));
161 if ((regno
== -1) || (regno
== FCRCS_REGNUM
))
162 fpregsetp
->fp_csr
= *(unsigned *) ®isters
[REGISTER_BYTE (FCRCS_REGNUM
)];
166 /* Figure out where the longjmp will land.
167 We expect the first arg to be a pointer to the jmp_buf structure from which
168 we extract the pc (JB_PC) that we will land at. The pc is copied into PC.
169 This routine returns true on success. */
172 get_longjmp_target (pc
)
175 char buf
[TARGET_PTR_BIT
/ TARGET_CHAR_BIT
];
178 jb_addr
= read_register (A0_REGNUM
);
180 if (target_read_memory (jb_addr
+ JB_PC
* JB_ELEMENT_SIZE
, buf
,
181 TARGET_PTR_BIT
/ TARGET_CHAR_BIT
))
184 *pc
= extract_address (buf
, TARGET_PTR_BIT
/ TARGET_CHAR_BIT
);
190 fetch_core_registers (core_reg_sect
, core_reg_size
, which
, reg_addr
)
192 unsigned core_reg_size
;
193 int which
; /* Unused */
194 CORE_ADDR reg_addr
; /* Unused */
196 if (core_reg_size
== REGISTER_BYTES
)
198 memcpy ((char *) registers
, core_reg_sect
, core_reg_size
);
200 else if (MIPS_REGSIZE
== 4 &&
201 core_reg_size
== (2 * MIPS_REGSIZE
) * NUM_REGS
)
203 /* This is a core file from a N32 executable, 64 bits are saved
204 for all registers. */
205 char *srcp
= core_reg_sect
;
206 char *dstp
= registers
;
209 for (regno
= 0; regno
< NUM_REGS
; regno
++)
211 if (regno
>= FP0_REGNUM
&& regno
< (FP0_REGNUM
+ 32))
213 /* FIXME, this is wrong, N32 has 64 bit FP regs, but GDB
214 currently assumes that they are 32 bit. */
219 if (REGISTER_RAW_SIZE (regno
) == 4)
221 /* copying 4 bytes from eight bytes?
222 I don't see how this can be right... */
227 /* copy all 8 bytes (sizeof(double)) */
246 warning ("wrong size gregset struct in core file");
250 registers_fetched ();
253 /* Irix 5 uses what appears to be a unique form of shared library
254 support. This is a copy of solib.c modified for Irix 5. */
255 /* FIXME: Most of this code could be merged with osfsolib.c and solib.c
256 by using next_link_map_member and xfer_link_map_member in solib.c. */
258 #include <sys/types.h>
260 #include <sys/param.h>
263 /* <obj.h> includes <sym.h> and <symconst.h>, which causes conflicts
264 with our versions of those files included by tm-mips.h. Prevent
265 <obj.h> from including them with some appropriate defines. */
267 #define __SYMCONST_H__
269 #ifdef HAVE_OBJLIST_H
273 #ifdef NEW_OBJ_INFO_MAGIC
274 #define HANDLE_NEW_OBJ_LIST
280 #include "objfiles.h"
283 #include "gdb_regex.h"
284 #include "inferior.h"
285 #include "language.h"
288 /* The symbol which starts off the list of shared libraries. */
289 #define DEBUG_BASE "__rld_obj_head"
291 /* Irix 6.x introduces a new variant of object lists.
292 To be able to debug O32 executables under Irix 6, we have to handle both
297 OBJ_LIST_OLD
, /* Pre Irix 6.x object list. */
298 OBJ_LIST_32
, /* 32 Bit Elf32_Obj_Info. */
299 OBJ_LIST_64
/* 64 Bit Elf64_Obj_Info, FIXME not yet implemented. */
303 /* Define our own link_map structure.
304 This will help to share code with osfsolib.c and solib.c. */
308 obj_list_variant l_variant
; /* which variant of object list */
309 CORE_ADDR l_lladdr
; /* addr in inferior list was read from */
310 CORE_ADDR l_next
; /* address of next object list entry */
313 /* Irix 5 shared objects are pre-linked to particular addresses
314 although the dynamic linker may have to relocate them if the
315 address ranges of the libraries used by the main program clash.
316 The offset is the difference between the address where the object
317 is mapped and the binding address of the shared library. */
318 #define LM_OFFSET(so) ((so) -> offset)
319 /* Loaded address of shared library. */
320 #define LM_ADDR(so) ((so) -> lmstart)
322 char shadow_contents
[BREAKPOINT_MAX
]; /* Stash old bkpt addr contents */
326 struct so_list
*next
; /* next structure in linked list */
328 CORE_ADDR offset
; /* prelink to load address offset */
329 char *so_name
; /* shared object lib name */
330 CORE_ADDR lmstart
; /* lower addr bound of mapped object */
331 CORE_ADDR lmend
; /* upper addr bound of mapped object */
332 char symbols_loaded
; /* flag: symbols read in yet? */
333 char from_tty
; /* flag: print msgs? */
334 struct objfile
*objfile
; /* objfile for loaded lib */
335 struct section_table
*sections
;
336 struct section_table
*sections_end
;
337 struct section_table
*textsection
;
341 static struct so_list
*so_list_head
; /* List of known shared objects */
342 static CORE_ADDR debug_base
; /* Base of dynamic linker structures */
343 static CORE_ADDR breakpoint_addr
; /* Address where end bkpt is set */
345 /* Local function prototypes */
347 static void sharedlibrary_command (char *, int);
349 static int enable_break (void);
351 static int disable_break (void);
353 static void info_sharedlibrary_command (char *, int);
355 static int symbol_add_stub (char *);
357 static struct so_list
*find_solib (struct so_list
*);
359 static struct link_map
*first_link_map_member (void);
361 static struct link_map
*next_link_map_member (struct so_list
*);
363 static void xfer_link_map_member (struct so_list
*, struct link_map
*);
365 static CORE_ADDR
locate_base (void);
367 static int solib_map_sections (char *);
373 solib_map_sections -- open bfd and build sections for shared lib
377 static int solib_map_sections (struct so_list *so)
381 Given a pointer to one of the shared objects in our list
382 of mapped objects, use the recorded name to open a bfd
383 descriptor for the object, build a section table, and then
384 relocate all the section addresses by the base address at
385 which the shared object was mapped.
389 In most (all?) cases the shared object file name recorded in the
390 dynamic linkage tables will be a fully qualified pathname. For
391 cases where it isn't, do we really mimic the systems search
392 mechanism correctly in the below code (particularly the tilde
397 solib_map_sections (arg
)
400 struct so_list
*so
= (struct so_list
*) arg
; /* catch_errors bogon */
402 char *scratch_pathname
;
404 struct section_table
*p
;
405 struct cleanup
*old_chain
;
408 filename
= tilde_expand (so
->so_name
);
409 old_chain
= make_cleanup (free
, filename
);
411 scratch_chan
= openp (getenv ("PATH"), 1, filename
, O_RDONLY
, 0,
413 if (scratch_chan
< 0)
415 scratch_chan
= openp (getenv ("LD_LIBRARY_PATH"), 1, filename
,
416 O_RDONLY
, 0, &scratch_pathname
);
418 if (scratch_chan
< 0)
420 perror_with_name (filename
);
422 /* Leave scratch_pathname allocated. abfd->name will point to it. */
424 abfd
= bfd_fdopenr (scratch_pathname
, gnutarget
, scratch_chan
);
427 close (scratch_chan
);
428 error ("Could not open `%s' as an executable file: %s",
429 scratch_pathname
, bfd_errmsg (bfd_get_error ()));
431 /* Leave bfd open, core_xfer_memory and "info files" need it. */
433 abfd
->cacheable
= true;
435 if (!bfd_check_format (abfd
, bfd_object
))
437 error ("\"%s\": not in executable format: %s.",
438 scratch_pathname
, bfd_errmsg (bfd_get_error ()));
440 if (build_section_table (abfd
, &so
->sections
, &so
->sections_end
))
442 error ("Can't find the file sections in `%s': %s",
443 bfd_get_filename (exec_bfd
), bfd_errmsg (bfd_get_error ()));
446 for (p
= so
->sections
; p
< so
->sections_end
; p
++)
448 /* Relocate the section binding addresses as recorded in the shared
449 object's file by the offset to get the address to which the
450 object was actually mapped. */
451 p
->addr
+= LM_OFFSET (so
);
452 p
->endaddr
+= LM_OFFSET (so
);
453 so
->lmend
= (CORE_ADDR
) max (p
->endaddr
, so
->lmend
);
454 if (STREQ (p
->the_bfd_section
->name
, ".text"))
460 /* Free the file names, close the file now. */
461 do_cleanups (old_chain
);
470 locate_base -- locate the base address of dynamic linker structs
474 CORE_ADDR locate_base (void)
478 For both the SunOS and SVR4 shared library implementations, if the
479 inferior executable has been linked dynamically, there is a single
480 address somewhere in the inferior's data space which is the key to
481 locating all of the dynamic linker's runtime structures. This
482 address is the value of the symbol defined by the macro DEBUG_BASE.
483 The job of this function is to find and return that address, or to
484 return 0 if there is no such address (the executable is statically
487 For SunOS, the job is almost trivial, since the dynamic linker and
488 all of it's structures are statically linked to the executable at
489 link time. Thus the symbol for the address we are looking for has
490 already been added to the minimal symbol table for the executable's
491 objfile at the time the symbol file's symbols were read, and all we
492 have to do is look it up there. Note that we explicitly do NOT want
493 to find the copies in the shared library.
495 The SVR4 version is much more complicated because the dynamic linker
496 and it's structures are located in the shared C library, which gets
497 run as the executable's "interpreter" by the kernel. We have to go
498 to a lot more work to discover the address of DEBUG_BASE. Because
499 of this complexity, we cache the value we find and return that value
500 on subsequent invocations. Note there is no copy in the executable
503 Irix 5 is basically like SunOS.
505 Note that we can assume nothing about the process state at the time
506 we need to find this address. We may be stopped on the first instruc-
507 tion of the interpreter (C shared library), the first instruction of
508 the executable itself, or somewhere else entirely (if we attached
509 to the process for example).
516 struct minimal_symbol
*msymbol
;
517 CORE_ADDR address
= 0;
519 msymbol
= lookup_minimal_symbol (DEBUG_BASE
, NULL
, symfile_objfile
);
520 if ((msymbol
!= NULL
) && (SYMBOL_VALUE_ADDRESS (msymbol
) != 0))
522 address
= SYMBOL_VALUE_ADDRESS (msymbol
);
531 first_link_map_member -- locate first member in dynamic linker's map
535 static struct link_map *first_link_map_member (void)
539 Read in a copy of the first member in the inferior's dynamic
540 link map from the inferior's dynamic linker structures, and return
541 a pointer to the link map descriptor.
544 static struct link_map
*
545 first_link_map_member ()
547 struct obj_list
*listp
;
548 struct obj_list list_old
;
550 static struct link_map first_lm
;
552 CORE_ADDR next_lladdr
;
554 /* We have not already read in the dynamic linking structures
555 from the inferior, lookup the address of the base structure. */
556 debug_base
= locate_base ();
560 /* Get address of first list entry. */
561 read_memory (debug_base
, (char *) &listp
, sizeof (struct obj_list
*));
566 /* Get first list entry. */
567 lladdr
= (CORE_ADDR
) listp
;
568 read_memory (lladdr
, (char *) &list_old
, sizeof (struct obj_list
));
570 /* The first entry in the list is the object file we are debugging,
572 next_lladdr
= (CORE_ADDR
) list_old
.next
;
574 #ifdef HANDLE_NEW_OBJ_LIST
575 if (list_old
.data
== NEW_OBJ_INFO_MAGIC
)
577 Elf32_Obj_Info list_32
;
579 read_memory (lladdr
, (char *) &list_32
, sizeof (Elf32_Obj_Info
));
580 if (list_32
.oi_size
!= sizeof (Elf32_Obj_Info
))
582 next_lladdr
= (CORE_ADDR
) list_32
.oi_next
;
586 if (next_lladdr
== 0)
589 first_lm
.l_lladdr
= next_lladdr
;
598 next_link_map_member -- locate next member in dynamic linker's map
602 static struct link_map *next_link_map_member (so_list_ptr)
606 Read in a copy of the next member in the inferior's dynamic
607 link map from the inferior's dynamic linker structures, and return
608 a pointer to the link map descriptor.
611 static struct link_map
*
612 next_link_map_member (so_list_ptr
)
613 struct so_list
*so_list_ptr
;
615 struct link_map
*lm
= &so_list_ptr
->lm
;
616 CORE_ADDR next_lladdr
= lm
->l_next
;
617 static struct link_map next_lm
;
619 if (next_lladdr
== 0)
621 /* We have hit the end of the list, so check to see if any were
622 added, but be quiet if we can't read from the target any more. */
625 if (lm
->l_variant
== OBJ_LIST_OLD
)
627 struct obj_list list_old
;
629 status
= target_read_memory (lm
->l_lladdr
,
631 sizeof (struct obj_list
));
632 next_lladdr
= (CORE_ADDR
) list_old
.next
;
634 #ifdef HANDLE_NEW_OBJ_LIST
635 else if (lm
->l_variant
== OBJ_LIST_32
)
637 Elf32_Obj_Info list_32
;
638 status
= target_read_memory (lm
->l_lladdr
,
640 sizeof (Elf32_Obj_Info
));
641 next_lladdr
= (CORE_ADDR
) list_32
.oi_next
;
645 if (status
!= 0 || next_lladdr
== 0)
649 next_lm
.l_lladdr
= next_lladdr
;
658 xfer_link_map_member -- set local variables from dynamic linker's map
662 static void xfer_link_map_member (so_list_ptr, lm)
666 Read in a copy of the requested member in the inferior's dynamic
667 link map from the inferior's dynamic linker structures, and fill
668 in the necessary so_list_ptr elements.
672 xfer_link_map_member (so_list_ptr
, lm
)
673 struct so_list
*so_list_ptr
;
676 struct obj_list list_old
;
677 CORE_ADDR lladdr
= lm
->l_lladdr
;
678 struct link_map
*new_lm
= &so_list_ptr
->lm
;
681 read_memory (lladdr
, (char *) &list_old
, sizeof (struct obj_list
));
683 new_lm
->l_variant
= OBJ_LIST_OLD
;
684 new_lm
->l_lladdr
= lladdr
;
685 new_lm
->l_next
= (CORE_ADDR
) list_old
.next
;
687 #ifdef HANDLE_NEW_OBJ_LIST
688 if (list_old
.data
== NEW_OBJ_INFO_MAGIC
)
690 Elf32_Obj_Info list_32
;
692 read_memory (lladdr
, (char *) &list_32
, sizeof (Elf32_Obj_Info
));
693 if (list_32
.oi_size
!= sizeof (Elf32_Obj_Info
))
695 new_lm
->l_variant
= OBJ_LIST_32
;
696 new_lm
->l_next
= (CORE_ADDR
) list_32
.oi_next
;
698 target_read_string ((CORE_ADDR
) list_32
.oi_pathname
,
699 &so_list_ptr
->so_name
,
700 list_32
.oi_pathname_len
+ 1, &errcode
);
702 memory_error (errcode
, (CORE_ADDR
) list_32
.oi_pathname
);
704 LM_ADDR (so_list_ptr
) = (CORE_ADDR
) list_32
.oi_ehdr
;
705 LM_OFFSET (so_list_ptr
) =
706 (CORE_ADDR
) list_32
.oi_ehdr
- (CORE_ADDR
) list_32
.oi_orig_ehdr
;
711 #if defined (_MIPS_SIM_NABI32) && _MIPS_SIM == _MIPS_SIM_NABI32
712 /* If we are compiling GDB under N32 ABI, the alignments in
713 the obj struct are different from the O32 ABI and we will get
714 wrong values when accessing the struct.
715 As a workaround we use fixed values which are good for
719 read_memory ((CORE_ADDR
) list_old
.data
, buf
, sizeof (buf
));
721 target_read_string (extract_address (&buf
[236], 4),
722 &so_list_ptr
->so_name
,
725 memory_error (errcode
, extract_address (&buf
[236], 4));
727 LM_ADDR (so_list_ptr
) = extract_address (&buf
[196], 4);
728 LM_OFFSET (so_list_ptr
) =
729 extract_address (&buf
[196], 4) - extract_address (&buf
[248], 4);
733 read_memory ((CORE_ADDR
) list_old
.data
, (char *) &obj_old
,
734 sizeof (struct obj
));
736 target_read_string ((CORE_ADDR
) obj_old
.o_path
,
737 &so_list_ptr
->so_name
,
740 memory_error (errcode
, (CORE_ADDR
) obj_old
.o_path
);
742 LM_ADDR (so_list_ptr
) = (CORE_ADDR
) obj_old
.o_praw
;
743 LM_OFFSET (so_list_ptr
) =
744 (CORE_ADDR
) obj_old
.o_praw
- obj_old
.o_base_address
;
748 catch_errors (solib_map_sections
, (char *) so_list_ptr
,
749 "Error while mapping shared library sections:\n",
758 find_solib -- step through list of shared objects
762 struct so_list *find_solib (struct so_list *so_list_ptr)
766 This module contains the routine which finds the names of any
767 loaded "images" in the current process. The argument in must be
768 NULL on the first call, and then the returned value must be passed
769 in on subsequent calls. This provides the capability to "step" down
770 the list of loaded objects. On the last object, a NULL value is
774 static struct so_list
*
775 find_solib (so_list_ptr
)
776 struct so_list
*so_list_ptr
; /* Last lm or NULL for first one */
778 struct so_list
*so_list_next
= NULL
;
779 struct link_map
*lm
= NULL
;
782 if (so_list_ptr
== NULL
)
784 /* We are setting up for a new scan through the loaded images. */
785 if ((so_list_next
= so_list_head
) == NULL
)
787 /* Find the first link map list member. */
788 lm
= first_link_map_member ();
793 /* We have been called before, and are in the process of walking
794 the shared library list. Advance to the next shared object. */
795 lm
= next_link_map_member (so_list_ptr
);
796 so_list_next
= so_list_ptr
->next
;
798 if ((so_list_next
== NULL
) && (lm
!= NULL
))
800 new = (struct so_list
*) xmalloc (sizeof (struct so_list
));
801 memset ((char *) new, 0, sizeof (struct so_list
));
802 /* Add the new node as the next node in the list, or as the root
803 node if this is the first one. */
804 if (so_list_ptr
!= NULL
)
806 so_list_ptr
->next
= new;
813 xfer_link_map_member (new, lm
);
815 return (so_list_next
);
818 /* A small stub to get us past the arg-passing pinhole of catch_errors. */
821 symbol_add_stub (arg
)
824 register struct so_list
*so
= (struct so_list
*) arg
; /* catch_errs bogon */
825 CORE_ADDR text_addr
= 0;
826 struct section_addr_info section_addrs
;
828 memset (§ion_addrs
, 0, sizeof (section_addrs
));
830 text_addr
= so
->textsection
->addr
;
831 else if (so
->abfd
!= NULL
)
833 asection
*lowest_sect
;
835 /* If we didn't find a mapped non zero sized .text section, set up
836 text_addr so that the relocation in symbol_file_add does no harm. */
838 lowest_sect
= bfd_get_section_by_name (so
->abfd
, ".text");
839 if (lowest_sect
== NULL
)
840 bfd_map_over_sections (so
->abfd
, find_lowest_section
,
843 text_addr
= bfd_section_vma (so
->abfd
, lowest_sect
) + LM_OFFSET (so
);
847 section_addrs
.other
[0].name
= ".text";
848 section_addrs
.other
[0].addr
= text_addr
;
849 so
->objfile
= symbol_file_add (so
->so_name
, so
->from_tty
,
850 §ion_addrs
, 0, 0);
858 solib_add -- add a shared library file to the symtab and section list
862 void solib_add (char *arg_string, int from_tty,
863 struct target_ops *target)
870 solib_add (arg_string
, from_tty
, target
)
873 struct target_ops
*target
;
875 register struct so_list
*so
= NULL
; /* link map state variable */
877 /* Last shared library that we read. */
878 struct so_list
*so_last
= NULL
;
884 if ((re_err
= re_comp (arg_string
? arg_string
: ".")) != NULL
)
886 error ("Invalid regexp: %s", re_err
);
889 /* Add the shared library sections to the section table of the
890 specified target, if any. */
893 /* Count how many new section_table entries there are. */
896 while ((so
= find_solib (so
)) != NULL
)
900 count
+= so
->sections_end
- so
->sections
;
906 old
= target_resize_to_sections (target
, count
);
908 /* Add these section table entries to the target's table. */
909 while ((so
= find_solib (so
)) != NULL
)
913 count
= so
->sections_end
- so
->sections
;
914 memcpy ((char *) (target
->to_sections
+ old
),
916 (sizeof (struct section_table
)) * count
);
923 /* Now add the symbol files. */
924 while ((so
= find_solib (so
)) != NULL
)
926 if (so
->so_name
[0] && re_exec (so
->so_name
))
928 so
->from_tty
= from_tty
;
929 if (so
->symbols_loaded
)
933 printf_unfiltered ("Symbols already loaded for %s\n", so
->so_name
);
936 else if (catch_errors
937 (symbol_add_stub
, (char *) so
,
938 "Error while reading shared library symbols:\n",
942 so
->symbols_loaded
= 1;
947 /* Getting new symbols may change our opinion about what is
950 reinit_frame_cache ();
957 info_sharedlibrary_command -- code for "info sharedlibrary"
961 static void info_sharedlibrary_command ()
965 Walk through the shared library list and print information
966 about each attached library.
970 info_sharedlibrary_command (ignore
, from_tty
)
974 register struct so_list
*so
= NULL
; /* link map state variable */
977 if (exec_bfd
== NULL
)
979 printf_unfiltered ("No executable file.\n");
982 while ((so
= find_solib (so
)) != NULL
)
988 printf_unfiltered ("%-12s%-12s%-12s%s\n", "From", "To", "Syms Read",
989 "Shared Object Library");
992 printf_unfiltered ("%-12s",
993 local_hex_string_custom ((unsigned long) LM_ADDR (so
),
995 printf_unfiltered ("%-12s",
996 local_hex_string_custom ((unsigned long) so
->lmend
,
998 printf_unfiltered ("%-12s", so
->symbols_loaded
? "Yes" : "No");
999 printf_unfiltered ("%s\n", so
->so_name
);
1002 if (so_list_head
== NULL
)
1004 printf_unfiltered ("No shared libraries loaded at this time.\n");
1012 solib_address -- check to see if an address is in a shared lib
1016 char *solib_address (CORE_ADDR address)
1020 Provides a hook for other gdb routines to discover whether or
1021 not a particular address is within the mapped address space of
1022 a shared library. Any address between the base mapping address
1023 and the first address beyond the end of the last mapping, is
1024 considered to be within the shared library address space, for
1027 For example, this routine is called at one point to disable
1028 breakpoints which are in shared libraries that are not currently
1033 solib_address (address
)
1036 register struct so_list
*so
= 0; /* link map state variable */
1038 while ((so
= find_solib (so
)) != NULL
)
1042 if ((address
>= (CORE_ADDR
) LM_ADDR (so
)) &&
1043 (address
< (CORE_ADDR
) so
->lmend
))
1044 return (so
->so_name
);
1050 /* Called by free_all_symtabs */
1055 struct so_list
*next
;
1058 disable_breakpoints_in_shlibs (1);
1060 while (so_list_head
)
1062 if (so_list_head
->sections
)
1064 free ((PTR
) so_list_head
->sections
);
1066 if (so_list_head
->abfd
)
1068 bfd_filename
= bfd_get_filename (so_list_head
->abfd
);
1069 if (!bfd_close (so_list_head
->abfd
))
1070 warning ("cannot close \"%s\": %s",
1071 bfd_filename
, bfd_errmsg (bfd_get_error ()));
1074 /* This happens for the executable on SVR4. */
1075 bfd_filename
= NULL
;
1077 next
= so_list_head
->next
;
1079 free ((PTR
) bfd_filename
);
1080 free (so_list_head
->so_name
);
1081 free ((PTR
) so_list_head
);
1082 so_list_head
= next
;
1091 disable_break -- remove the "mapping changed" breakpoint
1095 static int disable_break ()
1099 Removes the breakpoint that gets hit when the dynamic linker
1100 completes a mapping change.
1110 /* Note that breakpoint address and original contents are in our address
1111 space, so we just need to write the original contents back. */
1113 if (memory_remove_breakpoint (breakpoint_addr
, shadow_contents
) != 0)
1118 /* For the SVR4 version, we always know the breakpoint address. For the
1119 SunOS version we don't know it until the above code is executed.
1120 Grumble if we are stopped anywhere besides the breakpoint address. */
1122 if (stop_pc
!= breakpoint_addr
)
1124 warning ("stopped at unknown breakpoint while handling shared libraries");
1134 enable_break -- arrange for dynamic linker to hit breakpoint
1138 int enable_break (void)
1142 This functions inserts a breakpoint at the entry point of the
1143 main executable, where all shared libraries are mapped in.
1149 if (symfile_objfile
!= NULL
1150 && target_insert_breakpoint (symfile_objfile
->ei
.entry_point
,
1151 shadow_contents
) == 0)
1153 breakpoint_addr
= symfile_objfile
->ei
.entry_point
;
1164 solib_create_inferior_hook -- shared library startup support
1168 void solib_create_inferior_hook()
1172 When gdb starts up the inferior, it nurses it along (through the
1173 shell) until it is ready to execute it's first instruction. At this
1174 point, this function gets called via expansion of the macro
1175 SOLIB_CREATE_INFERIOR_HOOK.
1177 For SunOS executables, this first instruction is typically the
1178 one at "_start", or a similar text label, regardless of whether
1179 the executable is statically or dynamically linked. The runtime
1180 startup code takes care of dynamically linking in any shared
1181 libraries, once gdb allows the inferior to continue.
1183 For SVR4 executables, this first instruction is either the first
1184 instruction in the dynamic linker (for dynamically linked
1185 executables) or the instruction at "start" for statically linked
1186 executables. For dynamically linked executables, the system
1187 first exec's /lib/libc.so.N, which contains the dynamic linker,
1188 and starts it running. The dynamic linker maps in any needed
1189 shared libraries, maps in the actual user executable, and then
1190 jumps to "start" in the user executable.
1192 For both SunOS shared libraries, and SVR4 shared libraries, we
1193 can arrange to cooperate with the dynamic linker to discover the
1194 names of shared libraries that are dynamically linked, and the
1195 base addresses to which they are linked.
1197 This function is responsible for discovering those names and
1198 addresses, and saving sufficient information about them to allow
1199 their symbols to be read at a later time.
1203 Between enable_break() and disable_break(), this code does not
1204 properly handle hitting breakpoints which the user might have
1205 set in the startup code or in the dynamic linker itself. Proper
1206 handling will probably have to wait until the implementation is
1207 changed to use the "breakpoint handler function" method.
1209 Also, what if child has exit()ed? Must exit loop somehow.
1213 solib_create_inferior_hook ()
1215 if (!enable_break ())
1217 warning ("shared library handler failed to enable breakpoint");
1221 /* Now run the target. It will eventually hit the breakpoint, at
1222 which point all of the libraries will have been mapped in and we
1223 can go groveling around in the dynamic linker structures to find
1224 out what we need to know about them. */
1226 clear_proceed_status ();
1227 stop_soon_quietly
= 1;
1228 stop_signal
= TARGET_SIGNAL_0
;
1231 target_resume (-1, 0, stop_signal
);
1232 wait_for_inferior ();
1234 while (stop_signal
!= TARGET_SIGNAL_TRAP
);
1236 /* We are now either at the "mapping complete" breakpoint (or somewhere
1237 else, a condition we aren't prepared to deal with anyway), so adjust
1238 the PC as necessary after a breakpoint, disable the breakpoint, and
1239 add any shared libraries that were mapped in. */
1241 if (DECR_PC_AFTER_BREAK
)
1243 stop_pc
-= DECR_PC_AFTER_BREAK
;
1244 write_register (PC_REGNUM
, stop_pc
);
1247 if (!disable_break ())
1249 warning ("shared library handler failed to disable breakpoint");
1252 /* solib_add will call reinit_frame_cache.
1253 But we are stopped in the startup code and we might not have symbols
1254 for the startup code, so heuristic_proc_start could be called
1255 and will put out an annoying warning.
1256 Delaying the resetting of stop_soon_quietly until after symbol loading
1257 suppresses the warning. */
1259 solib_add ((char *) 0, 0, (struct target_ops
*) 0);
1260 stop_soon_quietly
= 0;
1267 sharedlibrary_command -- handle command to explicitly add library
1271 static void sharedlibrary_command (char *args, int from_tty)
1278 sharedlibrary_command (args
, from_tty
)
1283 solib_add (args
, from_tty
, (struct target_ops
*) 0);
1287 _initialize_solib ()
1289 add_com ("sharedlibrary", class_files
, sharedlibrary_command
,
1290 "Load shared object library symbols for files matching REGEXP.");
1291 add_info ("sharedlibrary", info_sharedlibrary_command
,
1292 "Status of loaded shared object libraries.");
1295 (add_set_cmd ("auto-solib-add", class_support
, var_zinteger
,
1296 (char *) &auto_solib_add
,
1297 "Set autoloading of shared library symbols.\n\
1298 If nonzero, symbols from all shared object libraries will be loaded\n\
1299 automatically when the inferior begins execution or when the dynamic linker\n\
1300 informs gdb that a new library has been loaded. Otherwise, symbols\n\
1301 must be loaded manually, using `sharedlibrary'.",
1307 /* Register that we are able to handle irix5 core file formats.
1308 This really is bfd_target_unknown_flavour */
1310 static struct core_fns irix5_core_fns
=
1312 bfd_target_unknown_flavour
, /* core_flavour */
1313 default_check_format
, /* check_format */
1314 default_core_sniffer
, /* core_sniffer */
1315 fetch_core_registers
, /* core_read_registers */
1320 _initialize_core_irix5 ()
1322 add_core_fns (&irix5_core_fns
);