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 (gregset_t
*gregsetp
)
56 register greg_t
*regp
= &(*gregsetp
)[0];
57 int gregoff
= sizeof (greg_t
) - MIPS_REGSIZE
;
58 static char zerobuf
[MAX_REGISTER_RAW_SIZE
] =
61 for (regi
= 0; regi
<= CTX_RA
; regi
++)
62 supply_register (regi
, (char *) (regp
+ regi
) + gregoff
);
64 supply_register (PC_REGNUM
, (char *) (regp
+ CTX_EPC
) + gregoff
);
65 supply_register (HI_REGNUM
, (char *) (regp
+ CTX_MDHI
) + gregoff
);
66 supply_register (LO_REGNUM
, (char *) (regp
+ CTX_MDLO
) + gregoff
);
67 supply_register (CAUSE_REGNUM
, (char *) (regp
+ CTX_CAUSE
) + gregoff
);
69 /* Fill inaccessible registers with zero. */
70 supply_register (BADVADDR_REGNUM
, zerobuf
);
74 fill_gregset (gregset_t
*gregsetp
, int regno
)
77 register greg_t
*regp
= &(*gregsetp
)[0];
79 /* Under Irix6, if GDB is built with N32 ABI and is debugging an O32
80 executable, we have to sign extend the registers to 64 bits before
81 filling in the gregset structure. */
83 for (regi
= 0; regi
<= CTX_RA
; regi
++)
84 if ((regno
== -1) || (regno
== regi
))
86 extract_signed_integer (®isters
[REGISTER_BYTE (regi
)],
87 REGISTER_RAW_SIZE (regi
));
89 if ((regno
== -1) || (regno
== PC_REGNUM
))
91 extract_signed_integer (®isters
[REGISTER_BYTE (PC_REGNUM
)],
92 REGISTER_RAW_SIZE (PC_REGNUM
));
94 if ((regno
== -1) || (regno
== CAUSE_REGNUM
))
96 extract_signed_integer (®isters
[REGISTER_BYTE (CAUSE_REGNUM
)],
97 REGISTER_RAW_SIZE (CAUSE_REGNUM
));
99 if ((regno
== -1) || (regno
== HI_REGNUM
))
101 extract_signed_integer (®isters
[REGISTER_BYTE (HI_REGNUM
)],
102 REGISTER_RAW_SIZE (HI_REGNUM
));
104 if ((regno
== -1) || (regno
== LO_REGNUM
))
106 extract_signed_integer (®isters
[REGISTER_BYTE (LO_REGNUM
)],
107 REGISTER_RAW_SIZE (LO_REGNUM
));
111 * Now we do the same thing for floating-point registers.
112 * We don't bother to condition on FP0_REGNUM since any
113 * reasonable MIPS configuration has an R3010 in it.
115 * Again, see the comments in m68k-tdep.c.
119 supply_fpregset (fpregset_t
*fpregsetp
)
122 static char zerobuf
[MAX_REGISTER_RAW_SIZE
] =
125 /* FIXME, this is wrong for the N32 ABI which has 64 bit FP regs. */
127 for (regi
= 0; regi
< 32; regi
++)
128 supply_register (FP0_REGNUM
+ regi
,
129 (char *) &fpregsetp
->fp_r
.fp_regs
[regi
]);
131 supply_register (FCRCS_REGNUM
, (char *) &fpregsetp
->fp_csr
);
133 /* FIXME: how can we supply FCRIR_REGNUM? SGI doesn't tell us. */
134 supply_register (FCRIR_REGNUM
, zerobuf
);
138 fill_fpregset (fpregset_t
*fpregsetp
, int regno
)
143 /* FIXME, this is wrong for the N32 ABI which has 64 bit FP regs. */
145 for (regi
= FP0_REGNUM
; regi
< FP0_REGNUM
+ 32; regi
++)
147 if ((regno
== -1) || (regno
== regi
))
149 from
= (char *) ®isters
[REGISTER_BYTE (regi
)];
150 to
= (char *) &(fpregsetp
->fp_r
.fp_regs
[regi
- FP0_REGNUM
]);
151 memcpy (to
, from
, REGISTER_RAW_SIZE (regi
));
155 if ((regno
== -1) || (regno
== FCRCS_REGNUM
))
156 fpregsetp
->fp_csr
= *(unsigned *) ®isters
[REGISTER_BYTE (FCRCS_REGNUM
)];
160 /* Figure out where the longjmp will land.
161 We expect the first arg to be a pointer to the jmp_buf structure from which
162 we extract the pc (JB_PC) that we will land at. The pc is copied into PC.
163 This routine returns true on success. */
166 get_longjmp_target (CORE_ADDR
*pc
)
168 char buf
[TARGET_PTR_BIT
/ TARGET_CHAR_BIT
];
171 jb_addr
= read_register (A0_REGNUM
);
173 if (target_read_memory (jb_addr
+ JB_PC
* JB_ELEMENT_SIZE
, buf
,
174 TARGET_PTR_BIT
/ TARGET_CHAR_BIT
))
177 *pc
= extract_address (buf
, TARGET_PTR_BIT
/ TARGET_CHAR_BIT
);
183 fetch_core_registers (core_reg_sect
, core_reg_size
, which
, reg_addr
)
185 unsigned core_reg_size
;
186 int which
; /* Unused */
187 CORE_ADDR reg_addr
; /* Unused */
189 if (core_reg_size
== REGISTER_BYTES
)
191 memcpy ((char *) registers
, core_reg_sect
, core_reg_size
);
193 else if (MIPS_REGSIZE
== 4 &&
194 core_reg_size
== (2 * MIPS_REGSIZE
) * NUM_REGS
)
196 /* This is a core file from a N32 executable, 64 bits are saved
197 for all registers. */
198 char *srcp
= core_reg_sect
;
199 char *dstp
= registers
;
202 for (regno
= 0; regno
< NUM_REGS
; regno
++)
204 if (regno
>= FP0_REGNUM
&& regno
< (FP0_REGNUM
+ 32))
206 /* FIXME, this is wrong, N32 has 64 bit FP regs, but GDB
207 currently assumes that they are 32 bit. */
212 if (REGISTER_RAW_SIZE (regno
) == 4)
214 /* copying 4 bytes from eight bytes?
215 I don't see how this can be right... */
220 /* copy all 8 bytes (sizeof(double)) */
239 warning ("wrong size gregset struct in core file");
243 registers_fetched ();
246 /* Irix 5 uses what appears to be a unique form of shared library
247 support. This is a copy of solib.c modified for Irix 5. */
248 /* FIXME: Most of this code could be merged with osfsolib.c and solib.c
249 by using next_link_map_member and xfer_link_map_member in solib.c. */
251 #include <sys/types.h>
253 #include <sys/param.h>
256 /* <obj.h> includes <sym.h> and <symconst.h>, which causes conflicts
257 with our versions of those files included by tm-mips.h. Prevent
258 <obj.h> from including them with some appropriate defines. */
260 #define __SYMCONST_H__
262 #ifdef HAVE_OBJLIST_H
266 #ifdef NEW_OBJ_INFO_MAGIC
267 #define HANDLE_NEW_OBJ_LIST
273 #include "objfiles.h"
276 #include "gdb_regex.h"
277 #include "inferior.h"
278 #include "language.h"
281 /* The symbol which starts off the list of shared libraries. */
282 #define DEBUG_BASE "__rld_obj_head"
284 /* Irix 6.x introduces a new variant of object lists.
285 To be able to debug O32 executables under Irix 6, we have to handle both
290 OBJ_LIST_OLD
, /* Pre Irix 6.x object list. */
291 OBJ_LIST_32
, /* 32 Bit Elf32_Obj_Info. */
292 OBJ_LIST_64
/* 64 Bit Elf64_Obj_Info, FIXME not yet implemented. */
296 /* Define our own link_map structure.
297 This will help to share code with osfsolib.c and solib.c. */
301 obj_list_variant l_variant
; /* which variant of object list */
302 CORE_ADDR l_lladdr
; /* addr in inferior list was read from */
303 CORE_ADDR l_next
; /* address of next object list entry */
306 /* Irix 5 shared objects are pre-linked to particular addresses
307 although the dynamic linker may have to relocate them if the
308 address ranges of the libraries used by the main program clash.
309 The offset is the difference between the address where the object
310 is mapped and the binding address of the shared library. */
311 #define LM_OFFSET(so) ((so) -> offset)
312 /* Loaded address of shared library. */
313 #define LM_ADDR(so) ((so) -> lmstart)
315 char shadow_contents
[BREAKPOINT_MAX
]; /* Stash old bkpt addr contents */
319 struct so_list
*next
; /* next structure in linked list */
321 CORE_ADDR offset
; /* prelink to load address offset */
322 char *so_name
; /* shared object lib name */
323 CORE_ADDR lmstart
; /* lower addr bound of mapped object */
324 CORE_ADDR lmend
; /* upper addr bound of mapped object */
325 char symbols_loaded
; /* flag: symbols read in yet? */
326 char from_tty
; /* flag: print msgs? */
327 struct objfile
*objfile
; /* objfile for loaded lib */
328 struct section_table
*sections
;
329 struct section_table
*sections_end
;
330 struct section_table
*textsection
;
334 static struct so_list
*so_list_head
; /* List of known shared objects */
335 static CORE_ADDR debug_base
; /* Base of dynamic linker structures */
336 static CORE_ADDR breakpoint_addr
; /* Address where end bkpt is set */
338 /* Local function prototypes */
340 static void sharedlibrary_command (char *, int);
342 static int enable_break (void);
344 static int disable_break (void);
346 static void info_sharedlibrary_command (char *, int);
348 static int symbol_add_stub (void *);
350 static struct so_list
*find_solib (struct so_list
*);
352 static struct link_map
*first_link_map_member (void);
354 static struct link_map
*next_link_map_member (struct so_list
*);
356 static void xfer_link_map_member (struct so_list
*, struct link_map
*);
358 static CORE_ADDR
locate_base (void);
360 static int solib_map_sections (void *);
366 solib_map_sections -- open bfd and build sections for shared lib
370 static int solib_map_sections (struct so_list *so)
374 Given a pointer to one of the shared objects in our list
375 of mapped objects, use the recorded name to open a bfd
376 descriptor for the object, build a section table, and then
377 relocate all the section addresses by the base address at
378 which the shared object was mapped.
382 In most (all?) cases the shared object file name recorded in the
383 dynamic linkage tables will be a fully qualified pathname. For
384 cases where it isn't, do we really mimic the systems search
385 mechanism correctly in the below code (particularly the tilde
390 solib_map_sections (void *arg
)
392 struct so_list
*so
= (struct so_list
*) arg
; /* catch_errors bogon */
394 char *scratch_pathname
;
396 struct section_table
*p
;
397 struct cleanup
*old_chain
;
400 filename
= tilde_expand (so
->so_name
);
401 old_chain
= make_cleanup (free
, filename
);
403 scratch_chan
= openp (getenv ("PATH"), 1, filename
, O_RDONLY
, 0,
405 if (scratch_chan
< 0)
407 scratch_chan
= openp (getenv ("LD_LIBRARY_PATH"), 1, filename
,
408 O_RDONLY
, 0, &scratch_pathname
);
410 if (scratch_chan
< 0)
412 perror_with_name (filename
);
414 /* Leave scratch_pathname allocated. abfd->name will point to it. */
416 abfd
= bfd_fdopenr (scratch_pathname
, gnutarget
, scratch_chan
);
419 close (scratch_chan
);
420 error ("Could not open `%s' as an executable file: %s",
421 scratch_pathname
, bfd_errmsg (bfd_get_error ()));
423 /* Leave bfd open, core_xfer_memory and "info files" need it. */
425 abfd
->cacheable
= true;
427 if (!bfd_check_format (abfd
, bfd_object
))
429 error ("\"%s\": not in executable format: %s.",
430 scratch_pathname
, bfd_errmsg (bfd_get_error ()));
432 if (build_section_table (abfd
, &so
->sections
, &so
->sections_end
))
434 error ("Can't find the file sections in `%s': %s",
435 bfd_get_filename (exec_bfd
), bfd_errmsg (bfd_get_error ()));
438 for (p
= so
->sections
; p
< so
->sections_end
; p
++)
440 /* Relocate the section binding addresses as recorded in the shared
441 object's file by the offset to get the address to which the
442 object was actually mapped. */
443 p
->addr
+= LM_OFFSET (so
);
444 p
->endaddr
+= LM_OFFSET (so
);
445 so
->lmend
= (CORE_ADDR
) max (p
->endaddr
, so
->lmend
);
446 if (STREQ (p
->the_bfd_section
->name
, ".text"))
452 /* Free the file names, close the file now. */
453 do_cleanups (old_chain
);
455 /* must be non-zero */
463 locate_base -- locate the base address of dynamic linker structs
467 CORE_ADDR locate_base (void)
471 For both the SunOS and SVR4 shared library implementations, if the
472 inferior executable has been linked dynamically, there is a single
473 address somewhere in the inferior's data space which is the key to
474 locating all of the dynamic linker's runtime structures. This
475 address is the value of the symbol defined by the macro DEBUG_BASE.
476 The job of this function is to find and return that address, or to
477 return 0 if there is no such address (the executable is statically
480 For SunOS, the job is almost trivial, since the dynamic linker and
481 all of it's structures are statically linked to the executable at
482 link time. Thus the symbol for the address we are looking for has
483 already been added to the minimal symbol table for the executable's
484 objfile at the time the symbol file's symbols were read, and all we
485 have to do is look it up there. Note that we explicitly do NOT want
486 to find the copies in the shared library.
488 The SVR4 version is much more complicated because the dynamic linker
489 and it's structures are located in the shared C library, which gets
490 run as the executable's "interpreter" by the kernel. We have to go
491 to a lot more work to discover the address of DEBUG_BASE. Because
492 of this complexity, we cache the value we find and return that value
493 on subsequent invocations. Note there is no copy in the executable
496 Irix 5 is basically like SunOS.
498 Note that we can assume nothing about the process state at the time
499 we need to find this address. We may be stopped on the first instruc-
500 tion of the interpreter (C shared library), the first instruction of
501 the executable itself, or somewhere else entirely (if we attached
502 to the process for example).
509 struct minimal_symbol
*msymbol
;
510 CORE_ADDR address
= 0;
512 msymbol
= lookup_minimal_symbol (DEBUG_BASE
, NULL
, symfile_objfile
);
513 if ((msymbol
!= NULL
) && (SYMBOL_VALUE_ADDRESS (msymbol
) != 0))
515 address
= SYMBOL_VALUE_ADDRESS (msymbol
);
524 first_link_map_member -- locate first member in dynamic linker's map
528 static struct link_map *first_link_map_member (void)
532 Read in a copy of the first member in the inferior's dynamic
533 link map from the inferior's dynamic linker structures, and return
534 a pointer to the link map descriptor.
537 static struct link_map
*
538 first_link_map_member (void)
540 struct obj_list
*listp
;
541 struct obj_list list_old
;
543 static struct link_map first_lm
;
545 CORE_ADDR next_lladdr
;
547 /* We have not already read in the dynamic linking structures
548 from the inferior, lookup the address of the base structure. */
549 debug_base
= locate_base ();
553 /* Get address of first list entry. */
554 read_memory (debug_base
, (char *) &listp
, sizeof (struct obj_list
*));
559 /* Get first list entry. */
560 /* The MIPS Sign extends addresses. */
561 lladdr
= host_pointer_to_address (listp
);
562 read_memory (lladdr
, (char *) &list_old
, sizeof (struct obj_list
));
564 /* The first entry in the list is the object file we are debugging,
566 next_lladdr
= host_pointer_to_address (list_old
.next
);
568 #ifdef HANDLE_NEW_OBJ_LIST
569 if (list_old
.data
== NEW_OBJ_INFO_MAGIC
)
571 Elf32_Obj_Info list_32
;
573 read_memory (lladdr
, (char *) &list_32
, sizeof (Elf32_Obj_Info
));
574 if (list_32
.oi_size
!= sizeof (Elf32_Obj_Info
))
576 next_lladdr
= (CORE_ADDR
) list_32
.oi_next
;
580 if (next_lladdr
== 0)
583 first_lm
.l_lladdr
= next_lladdr
;
592 next_link_map_member -- locate next member in dynamic linker's map
596 static struct link_map *next_link_map_member (so_list_ptr)
600 Read in a copy of the next member in the inferior's dynamic
601 link map from the inferior's dynamic linker structures, and return
602 a pointer to the link map descriptor.
605 static struct link_map
*
606 next_link_map_member (struct so_list
*so_list_ptr
)
608 struct link_map
*lm
= &so_list_ptr
->lm
;
609 CORE_ADDR next_lladdr
= lm
->l_next
;
610 static struct link_map next_lm
;
612 if (next_lladdr
== 0)
614 /* We have hit the end of the list, so check to see if any were
615 added, but be quiet if we can't read from the target any more. */
618 if (lm
->l_variant
== OBJ_LIST_OLD
)
620 struct obj_list list_old
;
622 status
= target_read_memory (lm
->l_lladdr
,
624 sizeof (struct obj_list
));
625 next_lladdr
= host_pointer_to_address (list_old
.next
);
627 #ifdef HANDLE_NEW_OBJ_LIST
628 else if (lm
->l_variant
== OBJ_LIST_32
)
630 Elf32_Obj_Info list_32
;
631 status
= target_read_memory (lm
->l_lladdr
,
633 sizeof (Elf32_Obj_Info
));
634 next_lladdr
= (CORE_ADDR
) list_32
.oi_next
;
638 if (status
!= 0 || next_lladdr
== 0)
642 next_lm
.l_lladdr
= next_lladdr
;
651 xfer_link_map_member -- set local variables from dynamic linker's map
655 static void xfer_link_map_member (so_list_ptr, lm)
659 Read in a copy of the requested member in the inferior's dynamic
660 link map from the inferior's dynamic linker structures, and fill
661 in the necessary so_list_ptr elements.
665 xfer_link_map_member (struct so_list
*so_list_ptr
, struct link_map
*lm
)
667 struct obj_list list_old
;
668 CORE_ADDR lladdr
= lm
->l_lladdr
;
669 struct link_map
*new_lm
= &so_list_ptr
->lm
;
672 read_memory (lladdr
, (char *) &list_old
, sizeof (struct obj_list
));
674 new_lm
->l_variant
= OBJ_LIST_OLD
;
675 new_lm
->l_lladdr
= lladdr
;
676 new_lm
->l_next
= host_pointer_to_address (list_old
.next
);
678 #ifdef HANDLE_NEW_OBJ_LIST
679 if (list_old
.data
== NEW_OBJ_INFO_MAGIC
)
681 Elf32_Obj_Info list_32
;
683 read_memory (lladdr
, (char *) &list_32
, sizeof (Elf32_Obj_Info
));
684 if (list_32
.oi_size
!= sizeof (Elf32_Obj_Info
))
686 new_lm
->l_variant
= OBJ_LIST_32
;
687 new_lm
->l_next
= (CORE_ADDR
) list_32
.oi_next
;
689 target_read_string ((CORE_ADDR
) list_32
.oi_pathname
,
690 &so_list_ptr
->so_name
,
691 list_32
.oi_pathname_len
+ 1, &errcode
);
693 memory_error (errcode
, (CORE_ADDR
) list_32
.oi_pathname
);
695 LM_ADDR (so_list_ptr
) = (CORE_ADDR
) list_32
.oi_ehdr
;
696 LM_OFFSET (so_list_ptr
) =
697 (CORE_ADDR
) list_32
.oi_ehdr
- (CORE_ADDR
) list_32
.oi_orig_ehdr
;
702 #if defined (_MIPS_SIM_NABI32) && _MIPS_SIM == _MIPS_SIM_NABI32
703 /* If we are compiling GDB under N32 ABI, the alignments in
704 the obj struct are different from the O32 ABI and we will get
705 wrong values when accessing the struct.
706 As a workaround we use fixed values which are good for
710 read_memory ((CORE_ADDR
) list_old
.data
, buf
, sizeof (buf
));
712 target_read_string (extract_address (&buf
[236], 4),
713 &so_list_ptr
->so_name
,
716 memory_error (errcode
, extract_address (&buf
[236], 4));
718 LM_ADDR (so_list_ptr
) = extract_address (&buf
[196], 4);
719 LM_OFFSET (so_list_ptr
) =
720 extract_address (&buf
[196], 4) - extract_address (&buf
[248], 4);
724 read_memory ((CORE_ADDR
) list_old
.data
, (char *) &obj_old
,
725 sizeof (struct obj
));
727 target_read_string ((CORE_ADDR
) obj_old
.o_path
,
728 &so_list_ptr
->so_name
,
731 memory_error (errcode
, (CORE_ADDR
) obj_old
.o_path
);
733 LM_ADDR (so_list_ptr
) = (CORE_ADDR
) obj_old
.o_praw
;
734 LM_OFFSET (so_list_ptr
) =
735 (CORE_ADDR
) obj_old
.o_praw
- obj_old
.o_base_address
;
739 catch_errors (solib_map_sections
, (char *) so_list_ptr
,
740 "Error while mapping shared library sections:\n",
749 find_solib -- step through list of shared objects
753 struct so_list *find_solib (struct so_list *so_list_ptr)
757 This module contains the routine which finds the names of any
758 loaded "images" in the current process. The argument in must be
759 NULL on the first call, and then the returned value must be passed
760 in on subsequent calls. This provides the capability to "step" down
761 the list of loaded objects. On the last object, a NULL value is
765 static struct so_list
*
766 find_solib (so_list_ptr
)
767 struct so_list
*so_list_ptr
; /* Last lm or NULL for first one */
769 struct so_list
*so_list_next
= NULL
;
770 struct link_map
*lm
= NULL
;
773 if (so_list_ptr
== NULL
)
775 /* We are setting up for a new scan through the loaded images. */
776 if ((so_list_next
= so_list_head
) == NULL
)
778 /* Find the first link map list member. */
779 lm
= first_link_map_member ();
784 /* We have been called before, and are in the process of walking
785 the shared library list. Advance to the next shared object. */
786 lm
= next_link_map_member (so_list_ptr
);
787 so_list_next
= so_list_ptr
->next
;
789 if ((so_list_next
== NULL
) && (lm
!= NULL
))
791 new = (struct so_list
*) xmalloc (sizeof (struct so_list
));
792 memset ((char *) new, 0, sizeof (struct so_list
));
793 /* Add the new node as the next node in the list, or as the root
794 node if this is the first one. */
795 if (so_list_ptr
!= NULL
)
797 so_list_ptr
->next
= new;
804 xfer_link_map_member (new, lm
);
806 return (so_list_next
);
809 /* A small stub to get us past the arg-passing pinhole of catch_errors. */
812 symbol_add_stub (void *arg
)
814 register struct so_list
*so
= (struct so_list
*) arg
; /* catch_errs bogon */
815 CORE_ADDR text_addr
= 0;
816 struct section_addr_info section_addrs
;
818 memset (§ion_addrs
, 0, sizeof (section_addrs
));
820 text_addr
= so
->textsection
->addr
;
821 else if (so
->abfd
!= NULL
)
823 asection
*lowest_sect
;
825 /* If we didn't find a mapped non zero sized .text section, set up
826 text_addr so that the relocation in symbol_file_add does no harm. */
828 lowest_sect
= bfd_get_section_by_name (so
->abfd
, ".text");
829 if (lowest_sect
== NULL
)
830 bfd_map_over_sections (so
->abfd
, find_lowest_section
,
833 text_addr
= bfd_section_vma (so
->abfd
, lowest_sect
) + LM_OFFSET (so
);
837 section_addrs
.other
[0].name
= ".text";
838 section_addrs
.other
[0].addr
= text_addr
;
839 so
->objfile
= symbol_file_add (so
->so_name
, so
->from_tty
,
840 §ion_addrs
, 0, 0);
841 /* must be non-zero */
849 solib_add -- add a shared library file to the symtab and section list
853 void solib_add (char *arg_string, int from_tty,
854 struct target_ops *target)
861 solib_add (char *arg_string
, int from_tty
, struct target_ops
*target
)
863 register struct so_list
*so
= NULL
; /* link map state variable */
865 /* Last shared library that we read. */
866 struct so_list
*so_last
= NULL
;
872 if ((re_err
= re_comp (arg_string
? arg_string
: ".")) != NULL
)
874 error ("Invalid regexp: %s", re_err
);
877 /* Add the shared library sections to the section table of the
878 specified target, if any. */
881 /* Count how many new section_table entries there are. */
884 while ((so
= find_solib (so
)) != NULL
)
888 count
+= so
->sections_end
- so
->sections
;
894 old
= target_resize_to_sections (target
, count
);
896 /* Add these section table entries to the target's table. */
897 while ((so
= find_solib (so
)) != NULL
)
901 count
= so
->sections_end
- so
->sections
;
902 memcpy ((char *) (target
->to_sections
+ old
),
904 (sizeof (struct section_table
)) * count
);
911 /* Now add the symbol files. */
912 while ((so
= find_solib (so
)) != NULL
)
914 if (so
->so_name
[0] && re_exec (so
->so_name
))
916 so
->from_tty
= from_tty
;
917 if (so
->symbols_loaded
)
921 printf_unfiltered ("Symbols already loaded for %s\n", so
->so_name
);
924 else if (catch_errors
925 (symbol_add_stub
, (char *) so
,
926 "Error while reading shared library symbols:\n",
930 so
->symbols_loaded
= 1;
935 /* Getting new symbols may change our opinion about what is
938 reinit_frame_cache ();
945 info_sharedlibrary_command -- code for "info sharedlibrary"
949 static void info_sharedlibrary_command ()
953 Walk through the shared library list and print information
954 about each attached library.
958 info_sharedlibrary_command (char *ignore
, int from_tty
)
960 register struct so_list
*so
= NULL
; /* link map state variable */
963 if (exec_bfd
== NULL
)
965 printf_unfiltered ("No executable file.\n");
968 while ((so
= find_solib (so
)) != NULL
)
974 printf_unfiltered ("%-12s%-12s%-12s%s\n", "From", "To", "Syms Read",
975 "Shared Object Library");
978 printf_unfiltered ("%-12s",
979 local_hex_string_custom ((unsigned long) LM_ADDR (so
),
981 printf_unfiltered ("%-12s",
982 local_hex_string_custom ((unsigned long) so
->lmend
,
984 printf_unfiltered ("%-12s", so
->symbols_loaded
? "Yes" : "No");
985 printf_unfiltered ("%s\n", so
->so_name
);
988 if (so_list_head
== NULL
)
990 printf_unfiltered ("No shared libraries loaded at this time.\n");
998 solib_address -- check to see if an address is in a shared lib
1002 char *solib_address (CORE_ADDR address)
1006 Provides a hook for other gdb routines to discover whether or
1007 not a particular address is within the mapped address space of
1008 a shared library. Any address between the base mapping address
1009 and the first address beyond the end of the last mapping, is
1010 considered to be within the shared library address space, for
1013 For example, this routine is called at one point to disable
1014 breakpoints which are in shared libraries that are not currently
1019 solib_address (CORE_ADDR address
)
1021 register struct so_list
*so
= 0; /* link map state variable */
1023 while ((so
= find_solib (so
)) != NULL
)
1027 if ((address
>= (CORE_ADDR
) LM_ADDR (so
)) &&
1028 (address
< (CORE_ADDR
) so
->lmend
))
1029 return (so
->so_name
);
1035 /* Called by free_all_symtabs */
1040 struct so_list
*next
;
1043 disable_breakpoints_in_shlibs (1);
1045 while (so_list_head
)
1047 if (so_list_head
->sections
)
1049 free ((PTR
) so_list_head
->sections
);
1051 if (so_list_head
->abfd
)
1053 bfd_filename
= bfd_get_filename (so_list_head
->abfd
);
1054 if (!bfd_close (so_list_head
->abfd
))
1055 warning ("cannot close \"%s\": %s",
1056 bfd_filename
, bfd_errmsg (bfd_get_error ()));
1059 /* This happens for the executable on SVR4. */
1060 bfd_filename
= NULL
;
1062 next
= so_list_head
->next
;
1064 free ((PTR
) bfd_filename
);
1065 free (so_list_head
->so_name
);
1066 free ((PTR
) so_list_head
);
1067 so_list_head
= next
;
1076 disable_break -- remove the "mapping changed" breakpoint
1080 static int disable_break ()
1084 Removes the breakpoint that gets hit when the dynamic linker
1085 completes a mapping change.
1090 disable_break (void)
1095 /* Note that breakpoint address and original contents are in our address
1096 space, so we just need to write the original contents back. */
1098 if (memory_remove_breakpoint (breakpoint_addr
, shadow_contents
) != 0)
1103 /* For the SVR4 version, we always know the breakpoint address. For the
1104 SunOS version we don't know it until the above code is executed.
1105 Grumble if we are stopped anywhere besides the breakpoint address. */
1107 if (stop_pc
!= breakpoint_addr
)
1109 warning ("stopped at unknown breakpoint while handling shared libraries");
1119 enable_break -- arrange for dynamic linker to hit breakpoint
1123 int enable_break (void)
1127 This functions inserts a breakpoint at the entry point of the
1128 main executable, where all shared libraries are mapped in.
1134 if (symfile_objfile
!= NULL
1135 && target_insert_breakpoint (symfile_objfile
->ei
.entry_point
,
1136 shadow_contents
) == 0)
1138 breakpoint_addr
= symfile_objfile
->ei
.entry_point
;
1149 solib_create_inferior_hook -- shared library startup support
1153 void solib_create_inferior_hook()
1157 When gdb starts up the inferior, it nurses it along (through the
1158 shell) until it is ready to execute it's first instruction. At this
1159 point, this function gets called via expansion of the macro
1160 SOLIB_CREATE_INFERIOR_HOOK.
1162 For SunOS executables, this first instruction is typically the
1163 one at "_start", or a similar text label, regardless of whether
1164 the executable is statically or dynamically linked. The runtime
1165 startup code takes care of dynamically linking in any shared
1166 libraries, once gdb allows the inferior to continue.
1168 For SVR4 executables, this first instruction is either the first
1169 instruction in the dynamic linker (for dynamically linked
1170 executables) or the instruction at "start" for statically linked
1171 executables. For dynamically linked executables, the system
1172 first exec's /lib/libc.so.N, which contains the dynamic linker,
1173 and starts it running. The dynamic linker maps in any needed
1174 shared libraries, maps in the actual user executable, and then
1175 jumps to "start" in the user executable.
1177 For both SunOS shared libraries, and SVR4 shared libraries, we
1178 can arrange to cooperate with the dynamic linker to discover the
1179 names of shared libraries that are dynamically linked, and the
1180 base addresses to which they are linked.
1182 This function is responsible for discovering those names and
1183 addresses, and saving sufficient information about them to allow
1184 their symbols to be read at a later time.
1188 Between enable_break() and disable_break(), this code does not
1189 properly handle hitting breakpoints which the user might have
1190 set in the startup code or in the dynamic linker itself. Proper
1191 handling will probably have to wait until the implementation is
1192 changed to use the "breakpoint handler function" method.
1194 Also, what if child has exit()ed? Must exit loop somehow.
1198 solib_create_inferior_hook (void)
1200 if (!enable_break ())
1202 warning ("shared library handler failed to enable breakpoint");
1206 /* Now run the target. It will eventually hit the breakpoint, at
1207 which point all of the libraries will have been mapped in and we
1208 can go groveling around in the dynamic linker structures to find
1209 out what we need to know about them. */
1211 clear_proceed_status ();
1212 stop_soon_quietly
= 1;
1213 stop_signal
= TARGET_SIGNAL_0
;
1216 target_resume (-1, 0, stop_signal
);
1217 wait_for_inferior ();
1219 while (stop_signal
!= TARGET_SIGNAL_TRAP
);
1221 /* We are now either at the "mapping complete" breakpoint (or somewhere
1222 else, a condition we aren't prepared to deal with anyway), so adjust
1223 the PC as necessary after a breakpoint, disable the breakpoint, and
1224 add any shared libraries that were mapped in. */
1226 if (DECR_PC_AFTER_BREAK
)
1228 stop_pc
-= DECR_PC_AFTER_BREAK
;
1229 write_register (PC_REGNUM
, stop_pc
);
1232 if (!disable_break ())
1234 warning ("shared library handler failed to disable breakpoint");
1237 /* solib_add will call reinit_frame_cache.
1238 But we are stopped in the startup code and we might not have symbols
1239 for the startup code, so heuristic_proc_start could be called
1240 and will put out an annoying warning.
1241 Delaying the resetting of stop_soon_quietly until after symbol loading
1242 suppresses the warning. */
1244 solib_add ((char *) 0, 0, (struct target_ops
*) 0);
1245 stop_soon_quietly
= 0;
1252 sharedlibrary_command -- handle command to explicitly add library
1256 static void sharedlibrary_command (char *args, int from_tty)
1263 sharedlibrary_command (char *args
, int from_tty
)
1266 solib_add (args
, from_tty
, (struct target_ops
*) 0);
1270 _initialize_solib (void)
1272 add_com ("sharedlibrary", class_files
, sharedlibrary_command
,
1273 "Load shared object library symbols for files matching REGEXP.");
1274 add_info ("sharedlibrary", info_sharedlibrary_command
,
1275 "Status of loaded shared object libraries.");
1278 (add_set_cmd ("auto-solib-add", class_support
, var_zinteger
,
1279 (char *) &auto_solib_add
,
1280 "Set autoloading of shared library symbols.\n\
1281 If nonzero, symbols from all shared object libraries will be loaded\n\
1282 automatically when the inferior begins execution or when the dynamic linker\n\
1283 informs gdb that a new library has been loaded. Otherwise, symbols\n\
1284 must be loaded manually, using `sharedlibrary'.",
1290 /* Register that we are able to handle irix5 core file formats.
1291 This really is bfd_target_unknown_flavour */
1293 static struct core_fns irix5_core_fns
=
1295 bfd_target_unknown_flavour
, /* core_flavour */
1296 default_check_format
, /* check_format */
1297 default_core_sniffer
, /* core_sniffer */
1298 fetch_core_registers
, /* core_read_registers */
1303 _initialize_core_irix5 (void)
1305 add_core_fns (&irix5_core_fns
);