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 (void *);
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 (void *);
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 (void *arg
)
399 struct so_list
*so
= (struct so_list
*) arg
; /* catch_errors bogon */
401 char *scratch_pathname
;
403 struct section_table
*p
;
404 struct cleanup
*old_chain
;
407 filename
= tilde_expand (so
->so_name
);
408 old_chain
= make_cleanup (free
, filename
);
410 scratch_chan
= openp (getenv ("PATH"), 1, filename
, O_RDONLY
, 0,
412 if (scratch_chan
< 0)
414 scratch_chan
= openp (getenv ("LD_LIBRARY_PATH"), 1, filename
,
415 O_RDONLY
, 0, &scratch_pathname
);
417 if (scratch_chan
< 0)
419 perror_with_name (filename
);
421 /* Leave scratch_pathname allocated. abfd->name will point to it. */
423 abfd
= bfd_fdopenr (scratch_pathname
, gnutarget
, scratch_chan
);
426 close (scratch_chan
);
427 error ("Could not open `%s' as an executable file: %s",
428 scratch_pathname
, bfd_errmsg (bfd_get_error ()));
430 /* Leave bfd open, core_xfer_memory and "info files" need it. */
432 abfd
->cacheable
= true;
434 if (!bfd_check_format (abfd
, bfd_object
))
436 error ("\"%s\": not in executable format: %s.",
437 scratch_pathname
, bfd_errmsg (bfd_get_error ()));
439 if (build_section_table (abfd
, &so
->sections
, &so
->sections_end
))
441 error ("Can't find the file sections in `%s': %s",
442 bfd_get_filename (exec_bfd
), bfd_errmsg (bfd_get_error ()));
445 for (p
= so
->sections
; p
< so
->sections_end
; p
++)
447 /* Relocate the section binding addresses as recorded in the shared
448 object's file by the offset to get the address to which the
449 object was actually mapped. */
450 p
->addr
+= LM_OFFSET (so
);
451 p
->endaddr
+= LM_OFFSET (so
);
452 so
->lmend
= (CORE_ADDR
) max (p
->endaddr
, so
->lmend
);
453 if (STREQ (p
->the_bfd_section
->name
, ".text"))
459 /* Free the file names, close the file now. */
460 do_cleanups (old_chain
);
462 /* must be non-zero */
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 /* The MIPS Sign extends addresses. */
568 lladdr
= host_pointer_to_address (listp
);
569 read_memory (lladdr
, (char *) &list_old
, sizeof (struct obj_list
));
571 /* The first entry in the list is the object file we are debugging,
573 next_lladdr
= host_pointer_to_address (list_old
.next
);
575 #ifdef HANDLE_NEW_OBJ_LIST
576 if (list_old
.data
== NEW_OBJ_INFO_MAGIC
)
578 Elf32_Obj_Info list_32
;
580 read_memory (lladdr
, (char *) &list_32
, sizeof (Elf32_Obj_Info
));
581 if (list_32
.oi_size
!= sizeof (Elf32_Obj_Info
))
583 next_lladdr
= (CORE_ADDR
) list_32
.oi_next
;
587 if (next_lladdr
== 0)
590 first_lm
.l_lladdr
= next_lladdr
;
599 next_link_map_member -- locate next member in dynamic linker's map
603 static struct link_map *next_link_map_member (so_list_ptr)
607 Read in a copy of the next member in the inferior's dynamic
608 link map from the inferior's dynamic linker structures, and return
609 a pointer to the link map descriptor.
612 static struct link_map
*
613 next_link_map_member (so_list_ptr
)
614 struct so_list
*so_list_ptr
;
616 struct link_map
*lm
= &so_list_ptr
->lm
;
617 CORE_ADDR next_lladdr
= lm
->l_next
;
618 static struct link_map next_lm
;
620 if (next_lladdr
== 0)
622 /* We have hit the end of the list, so check to see if any were
623 added, but be quiet if we can't read from the target any more. */
626 if (lm
->l_variant
== OBJ_LIST_OLD
)
628 struct obj_list list_old
;
630 status
= target_read_memory (lm
->l_lladdr
,
632 sizeof (struct obj_list
));
633 next_lladdr
= host_pointer_to_address (list_old
.next
);
635 #ifdef HANDLE_NEW_OBJ_LIST
636 else if (lm
->l_variant
== OBJ_LIST_32
)
638 Elf32_Obj_Info list_32
;
639 status
= target_read_memory (lm
->l_lladdr
,
641 sizeof (Elf32_Obj_Info
));
642 next_lladdr
= (CORE_ADDR
) list_32
.oi_next
;
646 if (status
!= 0 || next_lladdr
== 0)
650 next_lm
.l_lladdr
= next_lladdr
;
659 xfer_link_map_member -- set local variables from dynamic linker's map
663 static void xfer_link_map_member (so_list_ptr, lm)
667 Read in a copy of the requested member in the inferior's dynamic
668 link map from the inferior's dynamic linker structures, and fill
669 in the necessary so_list_ptr elements.
673 xfer_link_map_member (so_list_ptr
, lm
)
674 struct so_list
*so_list_ptr
;
677 struct obj_list list_old
;
678 CORE_ADDR lladdr
= lm
->l_lladdr
;
679 struct link_map
*new_lm
= &so_list_ptr
->lm
;
682 read_memory (lladdr
, (char *) &list_old
, sizeof (struct obj_list
));
684 new_lm
->l_variant
= OBJ_LIST_OLD
;
685 new_lm
->l_lladdr
= lladdr
;
686 new_lm
->l_next
= host_pointer_to_address (list_old
.next
);
688 #ifdef HANDLE_NEW_OBJ_LIST
689 if (list_old
.data
== NEW_OBJ_INFO_MAGIC
)
691 Elf32_Obj_Info list_32
;
693 read_memory (lladdr
, (char *) &list_32
, sizeof (Elf32_Obj_Info
));
694 if (list_32
.oi_size
!= sizeof (Elf32_Obj_Info
))
696 new_lm
->l_variant
= OBJ_LIST_32
;
697 new_lm
->l_next
= (CORE_ADDR
) list_32
.oi_next
;
699 target_read_string ((CORE_ADDR
) list_32
.oi_pathname
,
700 &so_list_ptr
->so_name
,
701 list_32
.oi_pathname_len
+ 1, &errcode
);
703 memory_error (errcode
, (CORE_ADDR
) list_32
.oi_pathname
);
705 LM_ADDR (so_list_ptr
) = (CORE_ADDR
) list_32
.oi_ehdr
;
706 LM_OFFSET (so_list_ptr
) =
707 (CORE_ADDR
) list_32
.oi_ehdr
- (CORE_ADDR
) list_32
.oi_orig_ehdr
;
712 #if defined (_MIPS_SIM_NABI32) && _MIPS_SIM == _MIPS_SIM_NABI32
713 /* If we are compiling GDB under N32 ABI, the alignments in
714 the obj struct are different from the O32 ABI and we will get
715 wrong values when accessing the struct.
716 As a workaround we use fixed values which are good for
720 read_memory ((CORE_ADDR
) list_old
.data
, buf
, sizeof (buf
));
722 target_read_string (extract_address (&buf
[236], 4),
723 &so_list_ptr
->so_name
,
726 memory_error (errcode
, extract_address (&buf
[236], 4));
728 LM_ADDR (so_list_ptr
) = extract_address (&buf
[196], 4);
729 LM_OFFSET (so_list_ptr
) =
730 extract_address (&buf
[196], 4) - extract_address (&buf
[248], 4);
734 read_memory ((CORE_ADDR
) list_old
.data
, (char *) &obj_old
,
735 sizeof (struct obj
));
737 target_read_string ((CORE_ADDR
) obj_old
.o_path
,
738 &so_list_ptr
->so_name
,
741 memory_error (errcode
, (CORE_ADDR
) obj_old
.o_path
);
743 LM_ADDR (so_list_ptr
) = (CORE_ADDR
) obj_old
.o_praw
;
744 LM_OFFSET (so_list_ptr
) =
745 (CORE_ADDR
) obj_old
.o_praw
- obj_old
.o_base_address
;
749 catch_errors (solib_map_sections
, (char *) so_list_ptr
,
750 "Error while mapping shared library sections:\n",
759 find_solib -- step through list of shared objects
763 struct so_list *find_solib (struct so_list *so_list_ptr)
767 This module contains the routine which finds the names of any
768 loaded "images" in the current process. The argument in must be
769 NULL on the first call, and then the returned value must be passed
770 in on subsequent calls. This provides the capability to "step" down
771 the list of loaded objects. On the last object, a NULL value is
775 static struct so_list
*
776 find_solib (so_list_ptr
)
777 struct so_list
*so_list_ptr
; /* Last lm or NULL for first one */
779 struct so_list
*so_list_next
= NULL
;
780 struct link_map
*lm
= NULL
;
783 if (so_list_ptr
== NULL
)
785 /* We are setting up for a new scan through the loaded images. */
786 if ((so_list_next
= so_list_head
) == NULL
)
788 /* Find the first link map list member. */
789 lm
= first_link_map_member ();
794 /* We have been called before, and are in the process of walking
795 the shared library list. Advance to the next shared object. */
796 lm
= next_link_map_member (so_list_ptr
);
797 so_list_next
= so_list_ptr
->next
;
799 if ((so_list_next
== NULL
) && (lm
!= NULL
))
801 new = (struct so_list
*) xmalloc (sizeof (struct so_list
));
802 memset ((char *) new, 0, sizeof (struct so_list
));
803 /* Add the new node as the next node in the list, or as the root
804 node if this is the first one. */
805 if (so_list_ptr
!= NULL
)
807 so_list_ptr
->next
= new;
814 xfer_link_map_member (new, lm
);
816 return (so_list_next
);
819 /* A small stub to get us past the arg-passing pinhole of catch_errors. */
822 symbol_add_stub (void *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);
851 /* must be non-zero */
859 solib_add -- add a shared library file to the symtab and section list
863 void solib_add (char *arg_string, int from_tty,
864 struct target_ops *target)
871 solib_add (arg_string
, from_tty
, target
)
874 struct target_ops
*target
;
876 register struct so_list
*so
= NULL
; /* link map state variable */
878 /* Last shared library that we read. */
879 struct so_list
*so_last
= NULL
;
885 if ((re_err
= re_comp (arg_string
? arg_string
: ".")) != NULL
)
887 error ("Invalid regexp: %s", re_err
);
890 /* Add the shared library sections to the section table of the
891 specified target, if any. */
894 /* Count how many new section_table entries there are. */
897 while ((so
= find_solib (so
)) != NULL
)
901 count
+= so
->sections_end
- so
->sections
;
907 old
= target_resize_to_sections (target
, count
);
909 /* Add these section table entries to the target's table. */
910 while ((so
= find_solib (so
)) != NULL
)
914 count
= so
->sections_end
- so
->sections
;
915 memcpy ((char *) (target
->to_sections
+ old
),
917 (sizeof (struct section_table
)) * count
);
924 /* Now add the symbol files. */
925 while ((so
= find_solib (so
)) != NULL
)
927 if (so
->so_name
[0] && re_exec (so
->so_name
))
929 so
->from_tty
= from_tty
;
930 if (so
->symbols_loaded
)
934 printf_unfiltered ("Symbols already loaded for %s\n", so
->so_name
);
937 else if (catch_errors
938 (symbol_add_stub
, (char *) so
,
939 "Error while reading shared library symbols:\n",
943 so
->symbols_loaded
= 1;
948 /* Getting new symbols may change our opinion about what is
951 reinit_frame_cache ();
958 info_sharedlibrary_command -- code for "info sharedlibrary"
962 static void info_sharedlibrary_command ()
966 Walk through the shared library list and print information
967 about each attached library.
971 info_sharedlibrary_command (ignore
, from_tty
)
975 register struct so_list
*so
= NULL
; /* link map state variable */
978 if (exec_bfd
== NULL
)
980 printf_unfiltered ("No executable file.\n");
983 while ((so
= find_solib (so
)) != NULL
)
989 printf_unfiltered ("%-12s%-12s%-12s%s\n", "From", "To", "Syms Read",
990 "Shared Object Library");
993 printf_unfiltered ("%-12s",
994 local_hex_string_custom ((unsigned long) LM_ADDR (so
),
996 printf_unfiltered ("%-12s",
997 local_hex_string_custom ((unsigned long) so
->lmend
,
999 printf_unfiltered ("%-12s", so
->symbols_loaded
? "Yes" : "No");
1000 printf_unfiltered ("%s\n", so
->so_name
);
1003 if (so_list_head
== NULL
)
1005 printf_unfiltered ("No shared libraries loaded at this time.\n");
1013 solib_address -- check to see if an address is in a shared lib
1017 char *solib_address (CORE_ADDR address)
1021 Provides a hook for other gdb routines to discover whether or
1022 not a particular address is within the mapped address space of
1023 a shared library. Any address between the base mapping address
1024 and the first address beyond the end of the last mapping, is
1025 considered to be within the shared library address space, for
1028 For example, this routine is called at one point to disable
1029 breakpoints which are in shared libraries that are not currently
1034 solib_address (address
)
1037 register struct so_list
*so
= 0; /* link map state variable */
1039 while ((so
= find_solib (so
)) != NULL
)
1043 if ((address
>= (CORE_ADDR
) LM_ADDR (so
)) &&
1044 (address
< (CORE_ADDR
) so
->lmend
))
1045 return (so
->so_name
);
1051 /* Called by free_all_symtabs */
1056 struct so_list
*next
;
1059 disable_breakpoints_in_shlibs (1);
1061 while (so_list_head
)
1063 if (so_list_head
->sections
)
1065 free ((PTR
) so_list_head
->sections
);
1067 if (so_list_head
->abfd
)
1069 bfd_filename
= bfd_get_filename (so_list_head
->abfd
);
1070 if (!bfd_close (so_list_head
->abfd
))
1071 warning ("cannot close \"%s\": %s",
1072 bfd_filename
, bfd_errmsg (bfd_get_error ()));
1075 /* This happens for the executable on SVR4. */
1076 bfd_filename
= NULL
;
1078 next
= so_list_head
->next
;
1080 free ((PTR
) bfd_filename
);
1081 free (so_list_head
->so_name
);
1082 free ((PTR
) so_list_head
);
1083 so_list_head
= next
;
1092 disable_break -- remove the "mapping changed" breakpoint
1096 static int disable_break ()
1100 Removes the breakpoint that gets hit when the dynamic linker
1101 completes a mapping change.
1111 /* Note that breakpoint address and original contents are in our address
1112 space, so we just need to write the original contents back. */
1114 if (memory_remove_breakpoint (breakpoint_addr
, shadow_contents
) != 0)
1119 /* For the SVR4 version, we always know the breakpoint address. For the
1120 SunOS version we don't know it until the above code is executed.
1121 Grumble if we are stopped anywhere besides the breakpoint address. */
1123 if (stop_pc
!= breakpoint_addr
)
1125 warning ("stopped at unknown breakpoint while handling shared libraries");
1135 enable_break -- arrange for dynamic linker to hit breakpoint
1139 int enable_break (void)
1143 This functions inserts a breakpoint at the entry point of the
1144 main executable, where all shared libraries are mapped in.
1150 if (symfile_objfile
!= NULL
1151 && target_insert_breakpoint (symfile_objfile
->ei
.entry_point
,
1152 shadow_contents
) == 0)
1154 breakpoint_addr
= symfile_objfile
->ei
.entry_point
;
1165 solib_create_inferior_hook -- shared library startup support
1169 void solib_create_inferior_hook()
1173 When gdb starts up the inferior, it nurses it along (through the
1174 shell) until it is ready to execute it's first instruction. At this
1175 point, this function gets called via expansion of the macro
1176 SOLIB_CREATE_INFERIOR_HOOK.
1178 For SunOS executables, this first instruction is typically the
1179 one at "_start", or a similar text label, regardless of whether
1180 the executable is statically or dynamically linked. The runtime
1181 startup code takes care of dynamically linking in any shared
1182 libraries, once gdb allows the inferior to continue.
1184 For SVR4 executables, this first instruction is either the first
1185 instruction in the dynamic linker (for dynamically linked
1186 executables) or the instruction at "start" for statically linked
1187 executables. For dynamically linked executables, the system
1188 first exec's /lib/libc.so.N, which contains the dynamic linker,
1189 and starts it running. The dynamic linker maps in any needed
1190 shared libraries, maps in the actual user executable, and then
1191 jumps to "start" in the user executable.
1193 For both SunOS shared libraries, and SVR4 shared libraries, we
1194 can arrange to cooperate with the dynamic linker to discover the
1195 names of shared libraries that are dynamically linked, and the
1196 base addresses to which they are linked.
1198 This function is responsible for discovering those names and
1199 addresses, and saving sufficient information about them to allow
1200 their symbols to be read at a later time.
1204 Between enable_break() and disable_break(), this code does not
1205 properly handle hitting breakpoints which the user might have
1206 set in the startup code or in the dynamic linker itself. Proper
1207 handling will probably have to wait until the implementation is
1208 changed to use the "breakpoint handler function" method.
1210 Also, what if child has exit()ed? Must exit loop somehow.
1214 solib_create_inferior_hook ()
1216 if (!enable_break ())
1218 warning ("shared library handler failed to enable breakpoint");
1222 /* Now run the target. It will eventually hit the breakpoint, at
1223 which point all of the libraries will have been mapped in and we
1224 can go groveling around in the dynamic linker structures to find
1225 out what we need to know about them. */
1227 clear_proceed_status ();
1228 stop_soon_quietly
= 1;
1229 stop_signal
= TARGET_SIGNAL_0
;
1232 target_resume (-1, 0, stop_signal
);
1233 wait_for_inferior ();
1235 while (stop_signal
!= TARGET_SIGNAL_TRAP
);
1237 /* We are now either at the "mapping complete" breakpoint (or somewhere
1238 else, a condition we aren't prepared to deal with anyway), so adjust
1239 the PC as necessary after a breakpoint, disable the breakpoint, and
1240 add any shared libraries that were mapped in. */
1242 if (DECR_PC_AFTER_BREAK
)
1244 stop_pc
-= DECR_PC_AFTER_BREAK
;
1245 write_register (PC_REGNUM
, stop_pc
);
1248 if (!disable_break ())
1250 warning ("shared library handler failed to disable breakpoint");
1253 /* solib_add will call reinit_frame_cache.
1254 But we are stopped in the startup code and we might not have symbols
1255 for the startup code, so heuristic_proc_start could be called
1256 and will put out an annoying warning.
1257 Delaying the resetting of stop_soon_quietly until after symbol loading
1258 suppresses the warning. */
1260 solib_add ((char *) 0, 0, (struct target_ops
*) 0);
1261 stop_soon_quietly
= 0;
1268 sharedlibrary_command -- handle command to explicitly add library
1272 static void sharedlibrary_command (char *args, int from_tty)
1279 sharedlibrary_command (args
, from_tty
)
1284 solib_add (args
, from_tty
, (struct target_ops
*) 0);
1288 _initialize_solib ()
1290 add_com ("sharedlibrary", class_files
, sharedlibrary_command
,
1291 "Load shared object library symbols for files matching REGEXP.");
1292 add_info ("sharedlibrary", info_sharedlibrary_command
,
1293 "Status of loaded shared object libraries.");
1296 (add_set_cmd ("auto-solib-add", class_support
, var_zinteger
,
1297 (char *) &auto_solib_add
,
1298 "Set autoloading of shared library symbols.\n\
1299 If nonzero, symbols from all shared object libraries will be loaded\n\
1300 automatically when the inferior begins execution or when the dynamic linker\n\
1301 informs gdb that a new library has been loaded. Otherwise, symbols\n\
1302 must be loaded manually, using `sharedlibrary'.",
1308 /* Register that we are able to handle irix5 core file formats.
1309 This really is bfd_target_unknown_flavour */
1311 static struct core_fns irix5_core_fns
=
1313 bfd_target_unknown_flavour
, /* core_flavour */
1314 default_check_format
, /* check_format */
1315 default_core_sniffer
, /* core_sniffer */
1316 fetch_core_registers
, /* core_read_registers */
1321 _initialize_core_irix5 ()
1323 add_core_fns (&irix5_core_fns
);