1 /* Native support for the SGI Iris running IRIX version 5, for GDB.
2 Copyright 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996
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, Boston, MA 02111-1307, USA. */
30 #include "gdb_string.h"
32 #include <sys/procfs.h>
33 #include <setjmp.h> /* For JB_XXX. */
36 fetch_core_registers
PARAMS ((char *, unsigned int, int, CORE_ADDR
));
38 /* Size of elements in jmpbuf */
40 #define JB_ELEMENT_SIZE 4
43 * See the comment in m68k-tdep.c regarding the utility of these functions.
45 * These definitions are from the MIPS SVR4 ABI, so they may work for
46 * any MIPS SVR4 target.
50 supply_gregset (gregsetp
)
54 register greg_t
*regp
= &(*gregsetp
)[0];
55 int gregoff
= sizeof (greg_t
) - MIPS_REGSIZE
;
56 static char zerobuf
[MAX_REGISTER_RAW_SIZE
] = {0};
58 for(regi
= 0; regi
<= CTX_RA
; regi
++)
59 supply_register (regi
, (char *)(regp
+ regi
) + gregoff
);
61 supply_register (PC_REGNUM
, (char *)(regp
+ CTX_EPC
) + gregoff
);
62 supply_register (HI_REGNUM
, (char *)(regp
+ CTX_MDHI
) + gregoff
);
63 supply_register (LO_REGNUM
, (char *)(regp
+ CTX_MDLO
) + gregoff
);
64 supply_register (CAUSE_REGNUM
, (char *)(regp
+ CTX_CAUSE
) + gregoff
);
66 /* Fill inaccessible registers with zero. */
67 supply_register (BADVADDR_REGNUM
, zerobuf
);
71 fill_gregset (gregsetp
, regno
)
76 register greg_t
*regp
= &(*gregsetp
)[0];
78 for (regi
= 0; regi
<= CTX_RA
; regi
++)
79 if ((regno
== -1) || (regno
== regi
))
81 extract_address (®isters
[REGISTER_BYTE (regi
)],
82 REGISTER_RAW_SIZE (regi
));
84 if ((regno
== -1) || (regno
== PC_REGNUM
))
86 extract_address (®isters
[REGISTER_BYTE (PC_REGNUM
)],
87 REGISTER_RAW_SIZE (PC_REGNUM
));
89 if ((regno
== -1) || (regno
== CAUSE_REGNUM
))
91 extract_address (®isters
[REGISTER_BYTE (CAUSE_REGNUM
)],
92 REGISTER_RAW_SIZE (CAUSE_REGNUM
));
94 if ((regno
== -1) || (regno
== HI_REGNUM
))
96 extract_address (®isters
[REGISTER_BYTE (HI_REGNUM
)],
97 REGISTER_RAW_SIZE (HI_REGNUM
));
99 if ((regno
== -1) || (regno
== LO_REGNUM
))
101 extract_address (®isters
[REGISTER_BYTE (LO_REGNUM
)],
102 REGISTER_RAW_SIZE (LO_REGNUM
));
106 * Now we do the same thing for floating-point registers.
107 * We don't bother to condition on FP0_REGNUM since any
108 * reasonable MIPS configuration has an R3010 in it.
110 * Again, see the comments in m68k-tdep.c.
114 supply_fpregset (fpregsetp
)
115 fpregset_t
*fpregsetp
;
118 static char zerobuf
[MAX_REGISTER_RAW_SIZE
] = {0};
120 /* FIXME, this is wrong for the N32 ABI which has 64 bit FP regs. */
122 for (regi
= 0; regi
< 32; regi
++)
123 supply_register (FP0_REGNUM
+ regi
,
124 (char *)&fpregsetp
->fp_r
.fp_regs
[regi
]);
126 supply_register (FCRCS_REGNUM
, (char *)&fpregsetp
->fp_csr
);
128 /* FIXME: how can we supply FCRIR_REGNUM? SGI doesn't tell us. */
129 supply_register (FCRIR_REGNUM
, zerobuf
);
133 fill_fpregset (fpregsetp
, regno
)
134 fpregset_t
*fpregsetp
;
140 /* FIXME, this is wrong for the N32 ABI which has 64 bit FP regs. */
142 for (regi
= FP0_REGNUM
; regi
< FP0_REGNUM
+ 32; regi
++)
144 if ((regno
== -1) || (regno
== regi
))
146 from
= (char *) ®isters
[REGISTER_BYTE (regi
)];
147 to
= (char *) &(fpregsetp
->fp_r
.fp_regs
[regi
- FP0_REGNUM
]);
148 memcpy(to
, from
, REGISTER_RAW_SIZE (regi
));
152 if ((regno
== -1) || (regno
== FCRCS_REGNUM
))
153 fpregsetp
->fp_csr
= *(unsigned *) ®isters
[REGISTER_BYTE(FCRCS_REGNUM
)];
157 /* Figure out where the longjmp will land.
158 We expect the first arg to be a pointer to the jmp_buf structure from which
159 we extract the pc (JB_PC) that we will land at. The pc is copied into PC.
160 This routine returns true on success. */
163 get_longjmp_target (pc
)
166 char buf
[TARGET_PTR_BIT
/ TARGET_CHAR_BIT
];
169 jb_addr
= read_register (A0_REGNUM
);
171 if (target_read_memory (jb_addr
+ JB_PC
* JB_ELEMENT_SIZE
, buf
,
172 TARGET_PTR_BIT
/ TARGET_CHAR_BIT
))
175 *pc
= extract_address (buf
, TARGET_PTR_BIT
/ TARGET_CHAR_BIT
);
181 fetch_core_registers (core_reg_sect
, core_reg_size
, which
, reg_addr
)
183 unsigned core_reg_size
;
184 int which
; /* Unused */
185 CORE_ADDR reg_addr
; /* Unused */
187 if (core_reg_size
== REGISTER_BYTES
)
189 memcpy ((char *)registers
, core_reg_sect
, core_reg_size
);
191 else if (core_reg_size
== (2 * REGISTER_BYTES
) && MIPS_REGSIZE
== 4)
193 /* This is a core file from a N32 executable, 64 bits are saved
194 for all registers. */
195 char *srcp
= core_reg_sect
;
196 char *dstp
= registers
;
199 for (regno
= 0; regno
< NUM_REGS
; regno
++)
201 if (regno
>= FP0_REGNUM
&& regno
< (FP0_REGNUM
+ 32))
203 /* FIXME, this is wrong, N32 has 64 bit FP regs, but GDB
204 currently assumes that they are 32 bit. */
223 warning ("wrong size gregset struct in core file");
227 registers_fetched ();
230 /* Irix 5 uses what appears to be a unique form of shared library
231 support. This is a copy of solib.c modified for Irix 5. */
232 /* FIXME: Most of this code could be merged with osfsolib.c and solib.c
233 by using next_link_map_member and xfer_link_map_member in solib.c. */
235 #include <sys/types.h>
237 #include <sys/param.h>
240 /* <obj.h> includes <sym.h> and <symconst.h>, which causes conflicts
241 with our versions of those files included by tm-mips.h. Prevent
242 <obj.h> from including them with some appropriate defines. */
244 #define __SYMCONST_H__
246 #ifdef HAVE_OBJLIST_H
250 #ifdef NEW_OBJ_INFO_MAGIC
251 #define HANDLE_NEW_OBJ_LIST
257 #include "objfiles.h"
260 #include "gnu-regex.h"
261 #include "inferior.h"
262 #include "language.h"
265 /* The symbol which starts off the list of shared libraries. */
266 #define DEBUG_BASE "__rld_obj_head"
268 /* Irix 6.x introduces a new variant of object lists.
269 To be able to debug O32 executables under Irix 6, we have to handle both
274 OBJ_LIST_OLD
, /* Pre Irix 6.x object list. */
275 OBJ_LIST_32
, /* 32 Bit Elf32_Obj_Info. */
276 OBJ_LIST_64
/* 64 Bit Elf64_Obj_Info, FIXME not yet implemented. */
279 /* Define our own link_map structure.
280 This will help to share code with osfsolib.c and solib.c. */
283 obj_list_variant l_variant
; /* which variant of object list */
284 CORE_ADDR l_lladdr
; /* addr in inferior list was read from */
285 CORE_ADDR l_next
; /* address of next object list entry */
288 /* Irix 5 shared objects are pre-linked to particular addresses
289 although the dynamic linker may have to relocate them if the
290 address ranges of the libraries used by the main program clash.
291 The offset is the difference between the address where the object
292 is mapped and the binding address of the shared library. */
293 #define LM_OFFSET(so) ((so) -> offset)
294 /* Loaded address of shared library. */
295 #define LM_ADDR(so) ((so) -> lmstart)
297 char shadow_contents
[BREAKPOINT_MAX
]; /* Stash old bkpt addr contents */
300 struct so_list
*next
; /* next structure in linked list */
302 CORE_ADDR offset
; /* prelink to load address offset */
303 char *so_name
; /* shared object lib name */
304 CORE_ADDR lmstart
; /* lower addr bound of mapped object */
305 CORE_ADDR lmend
; /* upper addr bound of mapped object */
306 char symbols_loaded
; /* flag: symbols read in yet? */
307 char from_tty
; /* flag: print msgs? */
308 struct objfile
*objfile
; /* objfile for loaded lib */
309 struct section_table
*sections
;
310 struct section_table
*sections_end
;
311 struct section_table
*textsection
;
315 static struct so_list
*so_list_head
; /* List of known shared objects */
316 static CORE_ADDR debug_base
; /* Base of dynamic linker structures */
317 static CORE_ADDR breakpoint_addr
; /* Address where end bkpt is set */
319 /* Local function prototypes */
322 sharedlibrary_command
PARAMS ((char *, int));
325 enable_break
PARAMS ((void));
328 disable_break
PARAMS ((void));
331 info_sharedlibrary_command
PARAMS ((char *, int));
334 symbol_add_stub
PARAMS ((char *));
336 static struct so_list
*
337 find_solib
PARAMS ((struct so_list
*));
339 static struct link_map
*
340 first_link_map_member
PARAMS ((void));
342 static struct link_map
*
343 next_link_map_member
PARAMS ((struct so_list
*));
346 xfer_link_map_member
PARAMS ((struct so_list
*, struct link_map
*));
349 locate_base
PARAMS ((void));
352 solib_map_sections
PARAMS ((struct so_list
*));
358 solib_map_sections -- open bfd and build sections for shared lib
362 static void solib_map_sections (struct so_list *so)
366 Given a pointer to one of the shared objects in our list
367 of mapped objects, use the recorded name to open a bfd
368 descriptor for the object, build a section table, and then
369 relocate all the section addresses by the base address at
370 which the shared object was mapped.
374 In most (all?) cases the shared object file name recorded in the
375 dynamic linkage tables will be a fully qualified pathname. For
376 cases where it isn't, do we really mimic the systems search
377 mechanism correctly in the below code (particularly the tilde
382 solib_map_sections (so
)
386 char *scratch_pathname
;
388 struct section_table
*p
;
389 struct cleanup
*old_chain
;
392 filename
= tilde_expand (so
-> so_name
);
393 old_chain
= make_cleanup (free
, filename
);
395 scratch_chan
= openp (getenv ("PATH"), 1, filename
, O_RDONLY
, 0,
397 if (scratch_chan
< 0)
399 scratch_chan
= openp (getenv ("LD_LIBRARY_PATH"), 1, filename
,
400 O_RDONLY
, 0, &scratch_pathname
);
402 if (scratch_chan
< 0)
404 perror_with_name (filename
);
406 /* Leave scratch_pathname allocated. abfd->name will point to it. */
408 abfd
= bfd_fdopenr (scratch_pathname
, gnutarget
, scratch_chan
);
411 close (scratch_chan
);
412 error ("Could not open `%s' as an executable file: %s",
413 scratch_pathname
, bfd_errmsg (bfd_get_error ()));
415 /* Leave bfd open, core_xfer_memory and "info files" need it. */
417 abfd
-> cacheable
= true;
419 if (!bfd_check_format (abfd
, bfd_object
))
421 error ("\"%s\": not in executable format: %s.",
422 scratch_pathname
, bfd_errmsg (bfd_get_error ()));
424 if (build_section_table (abfd
, &so
-> sections
, &so
-> sections_end
))
426 error ("Can't find the file sections in `%s': %s",
427 bfd_get_filename (exec_bfd
), bfd_errmsg (bfd_get_error ()));
430 for (p
= so
-> sections
; p
< so
-> sections_end
; p
++)
432 /* Relocate the section binding addresses as recorded in the shared
433 object's file by the offset to get the address to which the
434 object was actually mapped. */
435 p
-> addr
+= LM_OFFSET (so
);
436 p
-> endaddr
+= LM_OFFSET (so
);
437 so
-> lmend
= (CORE_ADDR
) max (p
-> endaddr
, so
-> lmend
);
438 if (STREQ (p
-> the_bfd_section
-> name
, ".text"))
440 so
-> textsection
= p
;
444 /* Free the file names, close the file now. */
445 do_cleanups (old_chain
);
452 locate_base -- locate the base address of dynamic linker structs
456 CORE_ADDR locate_base (void)
460 For both the SunOS and SVR4 shared library implementations, if the
461 inferior executable has been linked dynamically, there is a single
462 address somewhere in the inferior's data space which is the key to
463 locating all of the dynamic linker's runtime structures. This
464 address is the value of the symbol defined by the macro DEBUG_BASE.
465 The job of this function is to find and return that address, or to
466 return 0 if there is no such address (the executable is statically
469 For SunOS, the job is almost trivial, since the dynamic linker and
470 all of it's structures are statically linked to the executable at
471 link time. Thus the symbol for the address we are looking for has
472 already been added to the minimal symbol table for the executable's
473 objfile at the time the symbol file's symbols were read, and all we
474 have to do is look it up there. Note that we explicitly do NOT want
475 to find the copies in the shared library.
477 The SVR4 version is much more complicated because the dynamic linker
478 and it's structures are located in the shared C library, which gets
479 run as the executable's "interpreter" by the kernel. We have to go
480 to a lot more work to discover the address of DEBUG_BASE. Because
481 of this complexity, we cache the value we find and return that value
482 on subsequent invocations. Note there is no copy in the executable
485 Irix 5 is basically like SunOS.
487 Note that we can assume nothing about the process state at the time
488 we need to find this address. We may be stopped on the first instruc-
489 tion of the interpreter (C shared library), the first instruction of
490 the executable itself, or somewhere else entirely (if we attached
491 to the process for example).
498 struct minimal_symbol
*msymbol
;
499 CORE_ADDR address
= 0;
501 msymbol
= lookup_minimal_symbol (DEBUG_BASE
, NULL
, symfile_objfile
);
502 if ((msymbol
!= NULL
) && (SYMBOL_VALUE_ADDRESS (msymbol
) != 0))
504 address
= SYMBOL_VALUE_ADDRESS (msymbol
);
513 first_link_map_member -- locate first member in dynamic linker's map
517 static struct link_map *first_link_map_member (void)
521 Read in a copy of the first member in the inferior's dynamic
522 link map from the inferior's dynamic linker structures, and return
523 a pointer to the link map descriptor.
526 static struct link_map
*
527 first_link_map_member ()
529 struct obj_list
*listp
;
530 struct obj_list list_old
;
532 static struct link_map first_lm
;
534 CORE_ADDR next_lladdr
;
536 /* We have not already read in the dynamic linking structures
537 from the inferior, lookup the address of the base structure. */
538 debug_base
= locate_base ();
542 /* Get address of first list entry. */
543 read_memory (debug_base
, (char *) &listp
, sizeof (struct obj_list
*));
548 /* Get first list entry. */
549 lladdr
= (CORE_ADDR
) listp
;
550 read_memory (lladdr
, (char *) &list_old
, sizeof (struct obj_list
));
552 /* The first entry in the list is the object file we are debugging,
554 next_lladdr
= (CORE_ADDR
) list_old
.next
;
556 #ifdef HANDLE_NEW_OBJ_LIST
557 if (list_old
.data
== NEW_OBJ_INFO_MAGIC
)
559 Elf32_Obj_Info list_32
;
561 read_memory (lladdr
, (char *) &list_32
, sizeof (Elf32_Obj_Info
));
562 if (list_32
.oi_size
!= sizeof (Elf32_Obj_Info
))
564 next_lladdr
= (CORE_ADDR
) list_32
.oi_next
;
568 if (next_lladdr
== 0)
571 first_lm
.l_lladdr
= next_lladdr
;
580 next_link_map_member -- locate next member in dynamic linker's map
584 static struct link_map *next_link_map_member (so_list_ptr)
588 Read in a copy of the next member in the inferior's dynamic
589 link map from the inferior's dynamic linker structures, and return
590 a pointer to the link map descriptor.
593 static struct link_map
*
594 next_link_map_member (so_list_ptr
)
595 struct so_list
*so_list_ptr
;
597 struct link_map
*lm
= &so_list_ptr
-> lm
;
598 CORE_ADDR next_lladdr
= lm
-> l_next
;
599 static struct link_map next_lm
;
601 if (next_lladdr
== 0)
603 /* We have hit the end of the list, so check to see if any were
604 added, but be quiet if we can't read from the target any more. */
607 if (lm
-> l_variant
== OBJ_LIST_OLD
)
609 struct obj_list list_old
;
611 status
= target_read_memory (lm
-> l_lladdr
,
613 sizeof (struct obj_list
));
614 next_lladdr
= (CORE_ADDR
) list_old
.next
;
616 #ifdef HANDLE_NEW_OBJ_LIST
617 else if (lm
-> l_variant
== OBJ_LIST_32
)
619 Elf32_Obj_Info list_32
;
620 status
= target_read_memory (lm
-> l_lladdr
,
622 sizeof (Elf32_Obj_Info
));
623 next_lladdr
= (CORE_ADDR
) list_32
.oi_next
;
627 if (status
!= 0 || next_lladdr
== 0)
631 next_lm
.l_lladdr
= next_lladdr
;
640 xfer_link_map_member -- set local variables from dynamic linker's map
644 static void xfer_link_map_member (so_list_ptr, lm)
648 Read in a copy of the requested member in the inferior's dynamic
649 link map from the inferior's dynamic linker structures, and fill
650 in the necessary so_list_ptr elements.
654 xfer_link_map_member (so_list_ptr
, lm
)
655 struct so_list
*so_list_ptr
;
658 struct obj_list list_old
;
659 CORE_ADDR lladdr
= lm
-> l_lladdr
;
660 struct link_map
*new_lm
= &so_list_ptr
-> lm
;
663 read_memory (lladdr
, (char *) &list_old
, sizeof (struct obj_list
));
665 new_lm
-> l_variant
= OBJ_LIST_OLD
;
666 new_lm
-> l_lladdr
= lladdr
;
667 new_lm
-> l_next
= (CORE_ADDR
) list_old
.next
;
669 #ifdef HANDLE_NEW_OBJ_LIST
670 if (list_old
.data
== NEW_OBJ_INFO_MAGIC
)
672 Elf32_Obj_Info list_32
;
674 read_memory (lladdr
, (char *) &list_32
, sizeof (Elf32_Obj_Info
));
675 if (list_32
.oi_size
!= sizeof (Elf32_Obj_Info
))
677 new_lm
-> l_variant
= OBJ_LIST_32
;
678 new_lm
-> l_next
= (CORE_ADDR
) list_32
.oi_next
;
680 target_read_string ((CORE_ADDR
) list_32
.oi_pathname
,
681 &so_list_ptr
-> so_name
,
682 list_32
.oi_pathname_len
+ 1, &errcode
);
684 memory_error (errcode
, (CORE_ADDR
) list_32
.oi_pathname
);
686 LM_ADDR (so_list_ptr
) = (CORE_ADDR
) list_32
.oi_ehdr
;
687 LM_OFFSET (so_list_ptr
) =
688 (CORE_ADDR
) list_32
.oi_ehdr
- (CORE_ADDR
) list_32
.oi_orig_ehdr
;
693 #if defined (_MIPS_SIM_NABI32) && _MIPS_SIM == _MIPS_SIM_NABI32
694 /* If we are compiling GDB under N32 ABI, the alignments in
695 the obj struct are different from the O32 ABI and we will get
696 wrong values when accessing the struct.
697 As a workaround we use fixed values which are good for
701 read_memory ((CORE_ADDR
) list_old
.data
, buf
, sizeof (buf
));
703 target_read_string (extract_address (&buf
[236], 4),
704 &so_list_ptr
-> so_name
,
707 memory_error (errcode
, extract_address (&buf
[236], 4));
709 LM_ADDR (so_list_ptr
) = extract_address (&buf
[196], 4);
710 LM_OFFSET (so_list_ptr
) =
711 extract_address (&buf
[196], 4) - extract_address (&buf
[248], 4);
715 read_memory ((CORE_ADDR
) list_old
.data
, (char *) &obj_old
,
716 sizeof (struct obj
));
718 target_read_string ((CORE_ADDR
) obj_old
.o_path
,
719 &so_list_ptr
-> so_name
,
722 memory_error (errcode
, (CORE_ADDR
) obj_old
.o_path
);
724 LM_ADDR (so_list_ptr
) = (CORE_ADDR
) obj_old
.o_praw
;
725 LM_OFFSET (so_list_ptr
) =
726 (CORE_ADDR
) obj_old
.o_praw
- obj_old
.o_base_address
;
730 solib_map_sections (so_list_ptr
);
738 find_solib -- step through list of shared objects
742 struct so_list *find_solib (struct so_list *so_list_ptr)
746 This module contains the routine which finds the names of any
747 loaded "images" in the current process. The argument in must be
748 NULL on the first call, and then the returned value must be passed
749 in on subsequent calls. This provides the capability to "step" down
750 the list of loaded objects. On the last object, a NULL value is
754 static struct so_list
*
755 find_solib (so_list_ptr
)
756 struct so_list
*so_list_ptr
; /* Last lm or NULL for first one */
758 struct so_list
*so_list_next
= NULL
;
759 struct link_map
*lm
= NULL
;
762 if (so_list_ptr
== NULL
)
764 /* We are setting up for a new scan through the loaded images. */
765 if ((so_list_next
= so_list_head
) == NULL
)
767 /* Find the first link map list member. */
768 lm
= first_link_map_member ();
773 /* We have been called before, and are in the process of walking
774 the shared library list. Advance to the next shared object. */
775 lm
= next_link_map_member (so_list_ptr
);
776 so_list_next
= so_list_ptr
-> next
;
778 if ((so_list_next
== NULL
) && (lm
!= NULL
))
780 new = (struct so_list
*) xmalloc (sizeof (struct so_list
));
781 memset ((char *) new, 0, sizeof (struct so_list
));
782 /* Add the new node as the next node in the list, or as the root
783 node if this is the first one. */
784 if (so_list_ptr
!= NULL
)
786 so_list_ptr
-> next
= new;
793 xfer_link_map_member (new, lm
);
795 return (so_list_next
);
798 /* A small stub to get us past the arg-passing pinhole of catch_errors. */
801 symbol_add_stub (arg
)
804 register struct so_list
*so
= (struct so_list
*) arg
; /* catch_errs bogon */
805 CORE_ADDR text_addr
= 0;
807 if (so
-> textsection
)
808 text_addr
= so
-> textsection
-> addr
;
811 asection
*lowest_sect
;
813 /* If we didn't find a mapped non zero sized .text section, set up
814 text_addr so that the relocation in symbol_file_add does no harm. */
816 lowest_sect
= bfd_get_section_by_name (so
-> abfd
, ".text");
817 if (lowest_sect
== NULL
)
818 bfd_map_over_sections (so
-> abfd
, find_lowest_section
,
821 text_addr
= bfd_section_vma (so
-> abfd
, lowest_sect
) + LM_OFFSET (so
);
824 so
-> objfile
= symbol_file_add (so
-> so_name
, so
-> from_tty
,
834 solib_add -- add a shared library file to the symtab and section list
838 void solib_add (char *arg_string, int from_tty,
839 struct target_ops *target)
846 solib_add (arg_string
, from_tty
, target
)
849 struct target_ops
*target
;
851 register struct so_list
*so
= NULL
; /* link map state variable */
853 /* Last shared library that we read. */
854 struct so_list
*so_last
= NULL
;
860 if ((re_err
= re_comp (arg_string
? arg_string
: ".")) != NULL
)
862 error ("Invalid regexp: %s", re_err
);
865 /* Add the shared library sections to the section table of the
866 specified target, if any. */
869 /* Count how many new section_table entries there are. */
872 while ((so
= find_solib (so
)) != NULL
)
874 if (so
-> so_name
[0])
876 count
+= so
-> sections_end
- so
-> sections
;
884 /* We must update the to_sections field in the core_ops structure
885 here, otherwise we dereference a potential dangling pointer
886 for each call to target_read/write_memory within this routine. */
887 update_coreops
= core_ops
.to_sections
== target
->to_sections
;
889 /* Reallocate the target's section table including the new size. */
890 if (target
-> to_sections
)
892 old
= target
-> to_sections_end
- target
-> to_sections
;
893 target
-> to_sections
= (struct section_table
*)
894 xrealloc ((char *)target
-> to_sections
,
895 (sizeof (struct section_table
)) * (count
+ old
));
900 target
-> to_sections
= (struct section_table
*)
901 xmalloc ((sizeof (struct section_table
)) * count
);
903 target
-> to_sections_end
= target
-> to_sections
+ (count
+ old
);
905 /* Update the to_sections field in the core_ops structure
909 core_ops
.to_sections
= target
->to_sections
;
910 core_ops
.to_sections_end
= target
->to_sections_end
;
913 /* Add these section table entries to the target's table. */
914 while ((so
= find_solib (so
)) != NULL
)
916 if (so
-> so_name
[0])
918 count
= so
-> sections_end
- so
-> sections
;
919 memcpy ((char *) (target
-> to_sections
+ old
),
921 (sizeof (struct section_table
)) * count
);
928 /* Now add the symbol files. */
929 while ((so
= find_solib (so
)) != NULL
)
931 if (so
-> so_name
[0] && re_exec (so
-> so_name
))
933 so
-> from_tty
= from_tty
;
934 if (so
-> symbols_loaded
)
938 printf_unfiltered ("Symbols already loaded for %s\n", so
-> so_name
);
941 else if (catch_errors
942 (symbol_add_stub
, (char *) so
,
943 "Error while reading shared library symbols:\n",
947 so
-> symbols_loaded
= 1;
952 /* Getting new symbols may change our opinion about what is
955 reinit_frame_cache ();
962 info_sharedlibrary_command -- code for "info sharedlibrary"
966 static void info_sharedlibrary_command ()
970 Walk through the shared library list and print information
971 about each attached library.
975 info_sharedlibrary_command (ignore
, from_tty
)
979 register struct so_list
*so
= NULL
; /* link map state variable */
982 if (exec_bfd
== NULL
)
984 printf_unfiltered ("No exec file.\n");
987 while ((so
= find_solib (so
)) != NULL
)
989 if (so
-> so_name
[0])
993 printf_unfiltered("%-12s%-12s%-12s%s\n", "From", "To", "Syms Read",
994 "Shared Object Library");
997 printf_unfiltered ("%-12s",
998 local_hex_string_custom ((unsigned long) LM_ADDR (so
),
1000 printf_unfiltered ("%-12s",
1001 local_hex_string_custom ((unsigned long) so
-> lmend
,
1003 printf_unfiltered ("%-12s", so
-> symbols_loaded
? "Yes" : "No");
1004 printf_unfiltered ("%s\n", so
-> so_name
);
1007 if (so_list_head
== NULL
)
1009 printf_unfiltered ("No shared libraries loaded at this time.\n");
1017 solib_address -- check to see if an address is in a shared lib
1021 char *solib_address (CORE_ADDR address)
1025 Provides a hook for other gdb routines to discover whether or
1026 not a particular address is within the mapped address space of
1027 a shared library. Any address between the base mapping address
1028 and the first address beyond the end of the last mapping, is
1029 considered to be within the shared library address space, for
1032 For example, this routine is called at one point to disable
1033 breakpoints which are in shared libraries that are not currently
1038 solib_address (address
)
1041 register struct so_list
*so
= 0; /* link map state variable */
1043 while ((so
= find_solib (so
)) != NULL
)
1045 if (so
-> so_name
[0])
1047 if ((address
>= (CORE_ADDR
) LM_ADDR (so
)) &&
1048 (address
< (CORE_ADDR
) so
-> lmend
))
1049 return (so
->so_name
);
1055 /* Called by free_all_symtabs */
1060 struct so_list
*next
;
1063 while (so_list_head
)
1065 if (so_list_head
-> sections
)
1067 free ((PTR
)so_list_head
-> sections
);
1069 if (so_list_head
-> abfd
)
1071 bfd_filename
= bfd_get_filename (so_list_head
-> abfd
);
1072 if (!bfd_close (so_list_head
-> abfd
))
1073 warning ("cannot close \"%s\": %s",
1074 bfd_filename
, bfd_errmsg (bfd_get_error ()));
1077 /* This happens for the executable on SVR4. */
1078 bfd_filename
= NULL
;
1080 next
= so_list_head
-> next
;
1082 free ((PTR
)bfd_filename
);
1083 free (so_list_head
->so_name
);
1084 free ((PTR
)so_list_head
);
1085 so_list_head
= next
;
1094 disable_break -- remove the "mapping changed" breakpoint
1098 static int disable_break ()
1102 Removes the breakpoint that gets hit when the dynamic linker
1103 completes a mapping change.
1113 /* Note that breakpoint address and original contents are in our address
1114 space, so we just need to write the original contents back. */
1116 if (memory_remove_breakpoint (breakpoint_addr
, shadow_contents
) != 0)
1121 /* For the SVR4 version, we always know the breakpoint address. For the
1122 SunOS version we don't know it until the above code is executed.
1123 Grumble if we are stopped anywhere besides the breakpoint address. */
1125 if (stop_pc
!= breakpoint_addr
)
1127 warning ("stopped at unknown breakpoint while handling shared libraries");
1137 enable_break -- arrange for dynamic linker to hit breakpoint
1141 int enable_break (void)
1145 This functions inserts a breakpoint at the entry point of the
1146 main executable, where all shared libraries are mapped in.
1152 if (symfile_objfile
!= NULL
1153 && target_insert_breakpoint (symfile_objfile
->ei
.entry_point
,
1154 shadow_contents
) == 0)
1156 breakpoint_addr
= symfile_objfile
->ei
.entry_point
;
1167 solib_create_inferior_hook -- shared library startup support
1171 void solib_create_inferior_hook()
1175 When gdb starts up the inferior, it nurses it along (through the
1176 shell) until it is ready to execute it's first instruction. At this
1177 point, this function gets called via expansion of the macro
1178 SOLIB_CREATE_INFERIOR_HOOK.
1180 For SunOS executables, this first instruction is typically the
1181 one at "_start", or a similar text label, regardless of whether
1182 the executable is statically or dynamically linked. The runtime
1183 startup code takes care of dynamically linking in any shared
1184 libraries, once gdb allows the inferior to continue.
1186 For SVR4 executables, this first instruction is either the first
1187 instruction in the dynamic linker (for dynamically linked
1188 executables) or the instruction at "start" for statically linked
1189 executables. For dynamically linked executables, the system
1190 first exec's /lib/libc.so.N, which contains the dynamic linker,
1191 and starts it running. The dynamic linker maps in any needed
1192 shared libraries, maps in the actual user executable, and then
1193 jumps to "start" in the user executable.
1195 For both SunOS shared libraries, and SVR4 shared libraries, we
1196 can arrange to cooperate with the dynamic linker to discover the
1197 names of shared libraries that are dynamically linked, and the
1198 base addresses to which they are linked.
1200 This function is responsible for discovering those names and
1201 addresses, and saving sufficient information about them to allow
1202 their symbols to be read at a later time.
1206 Between enable_break() and disable_break(), this code does not
1207 properly handle hitting breakpoints which the user might have
1208 set in the startup code or in the dynamic linker itself. Proper
1209 handling will probably have to wait until the implementation is
1210 changed to use the "breakpoint handler function" method.
1212 Also, what if child has exit()ed? Must exit loop somehow.
1216 solib_create_inferior_hook()
1218 if (!enable_break ())
1220 warning ("shared library handler failed to enable breakpoint");
1224 /* Now run the target. It will eventually hit the breakpoint, at
1225 which point all of the libraries will have been mapped in and we
1226 can go groveling around in the dynamic linker structures to find
1227 out what we need to know about them. */
1229 clear_proceed_status ();
1230 stop_soon_quietly
= 1;
1231 stop_signal
= TARGET_SIGNAL_0
;
1234 target_resume (-1, 0, stop_signal
);
1235 wait_for_inferior ();
1237 while (stop_signal
!= TARGET_SIGNAL_TRAP
);
1239 /* We are now either at the "mapping complete" breakpoint (or somewhere
1240 else, a condition we aren't prepared to deal with anyway), so adjust
1241 the PC as necessary after a breakpoint, disable the breakpoint, and
1242 add any shared libraries that were mapped in. */
1244 if (DECR_PC_AFTER_BREAK
)
1246 stop_pc
-= DECR_PC_AFTER_BREAK
;
1247 write_register (PC_REGNUM
, stop_pc
);
1250 if (!disable_break ())
1252 warning ("shared library handler failed to disable breakpoint");
1255 /* solib_add will call reinit_frame_cache.
1256 But we are stopped in the startup code and we might not have symbols
1257 for the startup code, so heuristic_proc_start could be called
1258 and will put out an annoying warning.
1259 Delaying the resetting of stop_soon_quietly until after symbol loading
1260 suppresses the warning. */
1262 solib_add ((char *) 0, 0, (struct target_ops
*) 0);
1263 stop_soon_quietly
= 0;
1270 sharedlibrary_command -- handle command to explicitly add library
1274 static void sharedlibrary_command (char *args, int from_tty)
1281 sharedlibrary_command (args
, from_tty
)
1286 solib_add (args
, from_tty
, (struct target_ops
*) 0);
1292 add_com ("sharedlibrary", class_files
, sharedlibrary_command
,
1293 "Load shared object library symbols for files matching REGEXP.");
1294 add_info ("sharedlibrary", info_sharedlibrary_command
,
1295 "Status of loaded shared object libraries.");
1298 (add_set_cmd ("auto-solib-add", class_support
, var_zinteger
,
1299 (char *) &auto_solib_add
,
1300 "Set autoloading of shared library symbols.\n\
1301 If nonzero, symbols from all shared object libraries will be loaded\n\
1302 automatically when the inferior begins execution or when the dynamic linker\n\
1303 informs gdb that a new library has been loaded. Otherwise, symbols\n\
1304 must be loaded manually, using `sharedlibrary'.",
1310 /* Register that we are able to handle irix5 core file formats.
1311 This really is bfd_target_unknown_flavour */
1313 static struct core_fns irix5_core_fns
=
1315 bfd_target_unknown_flavour
,
1316 fetch_core_registers
,
1321 _initialize_core_irix5 ()
1323 add_core_fns (&irix5_core_fns
);