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binutils-gdb/gdb/irix5-nat.c

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/* Native support for the SGI Iris running IRIX version 5, for GDB.
Copyright 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996
Free Software Foundation, Inc.
Contributed by Alessandro Forin(af@cs.cmu.edu) at CMU
and by Per Bothner(bothner@cs.wisc.edu) at U.Wisconsin.
Implemented for Irix 4.x by Garrett A. Wollman.
Modified for Irix 5.x by Ian Lance Taylor.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
#include "defs.h"
#include "inferior.h"
#include "gdbcore.h"
#include "target.h"
#include "gdb_string.h"
#include <sys/time.h>
#include <sys/procfs.h>
#include <setjmp.h> /* For JB_XXX. */
static void
fetch_core_registers PARAMS ((char *, unsigned int, int, CORE_ADDR));
/* Size of elements in jmpbuf */
#define JB_ELEMENT_SIZE 4
/*
* See the comment in m68k-tdep.c regarding the utility of these functions.
*
* These definitions are from the MIPS SVR4 ABI, so they may work for
* any MIPS SVR4 target.
*/
void
supply_gregset (gregsetp)
gregset_t *gregsetp;
{
register int regi;
register greg_t *regp = &(*gregsetp)[0];
int gregoff = sizeof (greg_t) - MIPS_REGSIZE;
static char zerobuf[MAX_REGISTER_RAW_SIZE] = {0};
for(regi = 0; regi <= CTX_RA; regi++)
supply_register (regi, (char *)(regp + regi) + gregoff);
supply_register (PC_REGNUM, (char *)(regp + CTX_EPC) + gregoff);
supply_register (HI_REGNUM, (char *)(regp + CTX_MDHI) + gregoff);
supply_register (LO_REGNUM, (char *)(regp + CTX_MDLO) + gregoff);
supply_register (CAUSE_REGNUM, (char *)(regp + CTX_CAUSE) + gregoff);
/* Fill inaccessible registers with zero. */
supply_register (BADVADDR_REGNUM, zerobuf);
}
void
fill_gregset (gregsetp, regno)
gregset_t *gregsetp;
int regno;
{
int regi;
register greg_t *regp = &(*gregsetp)[0];
/* Under Irix6, if GDB is built with N32 ABI and is debugging an O32
executable, we have to sign extend the registers to 64 bits before
filling in the gregset structure. */
for (regi = 0; regi <= CTX_RA; regi++)
if ((regno == -1) || (regno == regi))
*(regp + regi) =
extract_signed_integer (&registers[REGISTER_BYTE (regi)],
REGISTER_RAW_SIZE (regi));
if ((regno == -1) || (regno == PC_REGNUM))
*(regp + CTX_EPC) =
extract_signed_integer (&registers[REGISTER_BYTE (PC_REGNUM)],
REGISTER_RAW_SIZE (PC_REGNUM));
if ((regno == -1) || (regno == CAUSE_REGNUM))
*(regp + CTX_CAUSE) =
extract_signed_integer (&registers[REGISTER_BYTE (CAUSE_REGNUM)],
REGISTER_RAW_SIZE (CAUSE_REGNUM));
if ((regno == -1) || (regno == HI_REGNUM))
*(regp + CTX_MDHI) =
extract_signed_integer (&registers[REGISTER_BYTE (HI_REGNUM)],
REGISTER_RAW_SIZE (HI_REGNUM));
if ((regno == -1) || (regno == LO_REGNUM))
*(regp + CTX_MDLO) =
extract_signed_integer (&registers[REGISTER_BYTE (LO_REGNUM)],
REGISTER_RAW_SIZE (LO_REGNUM));
}
/*
* Now we do the same thing for floating-point registers.
* We don't bother to condition on FP0_REGNUM since any
* reasonable MIPS configuration has an R3010 in it.
*
* Again, see the comments in m68k-tdep.c.
*/
void
supply_fpregset (fpregsetp)
fpregset_t *fpregsetp;
{
register int regi;
static char zerobuf[MAX_REGISTER_RAW_SIZE] = {0};
/* FIXME, this is wrong for the N32 ABI which has 64 bit FP regs. */
for (regi = 0; regi < 32; regi++)
supply_register (FP0_REGNUM + regi,
(char *)&fpregsetp->fp_r.fp_regs[regi]);
supply_register (FCRCS_REGNUM, (char *)&fpregsetp->fp_csr);
/* FIXME: how can we supply FCRIR_REGNUM? SGI doesn't tell us. */
supply_register (FCRIR_REGNUM, zerobuf);
}
void
fill_fpregset (fpregsetp, regno)
fpregset_t *fpregsetp;
int regno;
{
int regi;
char *from, *to;
/* FIXME, this is wrong for the N32 ABI which has 64 bit FP regs. */
for (regi = FP0_REGNUM; regi < FP0_REGNUM + 32; regi++)
{
if ((regno == -1) || (regno == regi))
{
from = (char *) &registers[REGISTER_BYTE (regi)];
to = (char *) &(fpregsetp->fp_r.fp_regs[regi - FP0_REGNUM]);
memcpy(to, from, REGISTER_RAW_SIZE (regi));
}
}
if ((regno == -1) || (regno == FCRCS_REGNUM))
fpregsetp->fp_csr = *(unsigned *) &registers[REGISTER_BYTE(FCRCS_REGNUM)];
}
/* Figure out where the longjmp will land.
We expect the first arg to be a pointer to the jmp_buf structure from which
we extract the pc (JB_PC) that we will land at. The pc is copied into PC.
This routine returns true on success. */
int
get_longjmp_target (pc)
CORE_ADDR *pc;
{
char buf[TARGET_PTR_BIT / TARGET_CHAR_BIT];
CORE_ADDR jb_addr;
jb_addr = read_register (A0_REGNUM);
if (target_read_memory (jb_addr + JB_PC * JB_ELEMENT_SIZE, buf,
TARGET_PTR_BIT / TARGET_CHAR_BIT))
return 0;
*pc = extract_address (buf, TARGET_PTR_BIT / TARGET_CHAR_BIT);
return 1;
}
static void
fetch_core_registers (core_reg_sect, core_reg_size, which, reg_addr)
char *core_reg_sect;
unsigned core_reg_size;
int which; /* Unused */
CORE_ADDR reg_addr; /* Unused */
{
if (core_reg_size == REGISTER_BYTES)
{
memcpy ((char *)registers, core_reg_sect, core_reg_size);
}
else if (core_reg_size == (2 * REGISTER_BYTES) && MIPS_REGSIZE == 4)
{
/* This is a core file from a N32 executable, 64 bits are saved
for all registers. */
char *srcp = core_reg_sect;
char *dstp = registers;
int regno;
for (regno = 0; regno < NUM_REGS; regno++)
{
if (regno >= FP0_REGNUM && regno < (FP0_REGNUM + 32))
{
/* FIXME, this is wrong, N32 has 64 bit FP regs, but GDB
currently assumes that they are 32 bit. */
*dstp++ = *srcp++;
*dstp++ = *srcp++;
*dstp++ = *srcp++;
*dstp++ = *srcp++;
srcp += 4;
}
else
{
srcp += 4;
*dstp++ = *srcp++;
*dstp++ = *srcp++;
*dstp++ = *srcp++;
*dstp++ = *srcp++;
}
}
}
else
{
warning ("wrong size gregset struct in core file");
return;
}
registers_fetched ();
}
/* Irix 5 uses what appears to be a unique form of shared library
support. This is a copy of solib.c modified for Irix 5. */
/* FIXME: Most of this code could be merged with osfsolib.c and solib.c
by using next_link_map_member and xfer_link_map_member in solib.c. */
#include <sys/types.h>
#include <signal.h>
#include <sys/param.h>
#include <fcntl.h>
/* <obj.h> includes <sym.h> and <symconst.h>, which causes conflicts
with our versions of those files included by tm-mips.h. Prevent
<obj.h> from including them with some appropriate defines. */
#define __SYM_H__
#define __SYMCONST_H__
#include <obj.h>
#ifdef HAVE_OBJLIST_H
#include <objlist.h>
#endif
#ifdef NEW_OBJ_INFO_MAGIC
#define HANDLE_NEW_OBJ_LIST
#endif
#include "symtab.h"
#include "bfd.h"
#include "symfile.h"
#include "objfiles.h"
#include "command.h"
#include "frame.h"
#include "gnu-regex.h"
#include "inferior.h"
#include "language.h"
#include "gdbcmd.h"
/* The symbol which starts off the list of shared libraries. */
#define DEBUG_BASE "__rld_obj_head"
/* Irix 6.x introduces a new variant of object lists.
To be able to debug O32 executables under Irix 6, we have to handle both
variants. */
typedef enum
{
OBJ_LIST_OLD, /* Pre Irix 6.x object list. */
OBJ_LIST_32, /* 32 Bit Elf32_Obj_Info. */
OBJ_LIST_64 /* 64 Bit Elf64_Obj_Info, FIXME not yet implemented. */
} obj_list_variant;
/* Define our own link_map structure.
This will help to share code with osfsolib.c and solib.c. */
struct link_map {
obj_list_variant l_variant; /* which variant of object list */
CORE_ADDR l_lladdr; /* addr in inferior list was read from */
CORE_ADDR l_next; /* address of next object list entry */
};
/* Irix 5 shared objects are pre-linked to particular addresses
although the dynamic linker may have to relocate them if the
address ranges of the libraries used by the main program clash.
The offset is the difference between the address where the object
is mapped and the binding address of the shared library. */
#define LM_OFFSET(so) ((so) -> offset)
/* Loaded address of shared library. */
#define LM_ADDR(so) ((so) -> lmstart)
char shadow_contents[BREAKPOINT_MAX]; /* Stash old bkpt addr contents */
struct so_list {
struct so_list *next; /* next structure in linked list */
struct link_map lm;
CORE_ADDR offset; /* prelink to load address offset */
char *so_name; /* shared object lib name */
CORE_ADDR lmstart; /* lower addr bound of mapped object */
CORE_ADDR lmend; /* upper addr bound of mapped object */
char symbols_loaded; /* flag: symbols read in yet? */
char from_tty; /* flag: print msgs? */
struct objfile *objfile; /* objfile for loaded lib */
struct section_table *sections;
struct section_table *sections_end;
struct section_table *textsection;
bfd *abfd;
};
static struct so_list *so_list_head; /* List of known shared objects */
static CORE_ADDR debug_base; /* Base of dynamic linker structures */
static CORE_ADDR breakpoint_addr; /* Address where end bkpt is set */
/* Local function prototypes */
static void
sharedlibrary_command PARAMS ((char *, int));
static int
enable_break PARAMS ((void));
static int
disable_break PARAMS ((void));
static void
info_sharedlibrary_command PARAMS ((char *, int));
static int
symbol_add_stub PARAMS ((char *));
static struct so_list *
find_solib PARAMS ((struct so_list *));
static struct link_map *
first_link_map_member PARAMS ((void));
static struct link_map *
next_link_map_member PARAMS ((struct so_list *));
static void
xfer_link_map_member PARAMS ((struct so_list *, struct link_map *));
static CORE_ADDR
locate_base PARAMS ((void));
static void
solib_map_sections PARAMS ((struct so_list *));
/*
LOCAL FUNCTION
solib_map_sections -- open bfd and build sections for shared lib
SYNOPSIS
static void solib_map_sections (struct so_list *so)
DESCRIPTION
Given a pointer to one of the shared objects in our list
of mapped objects, use the recorded name to open a bfd
descriptor for the object, build a section table, and then
relocate all the section addresses by the base address at
which the shared object was mapped.
FIXMES
In most (all?) cases the shared object file name recorded in the
dynamic linkage tables will be a fully qualified pathname. For
cases where it isn't, do we really mimic the systems search
mechanism correctly in the below code (particularly the tilde
expansion stuff?).
*/
static void
solib_map_sections (so)
struct so_list *so;
{
char *filename;
char *scratch_pathname;
int scratch_chan;
struct section_table *p;
struct cleanup *old_chain;
bfd *abfd;
filename = tilde_expand (so -> so_name);
old_chain = make_cleanup (free, filename);
scratch_chan = openp (getenv ("PATH"), 1, filename, O_RDONLY, 0,
&scratch_pathname);
if (scratch_chan < 0)
{
scratch_chan = openp (getenv ("LD_LIBRARY_PATH"), 1, filename,
O_RDONLY, 0, &scratch_pathname);
}
if (scratch_chan < 0)
{
perror_with_name (filename);
}
/* Leave scratch_pathname allocated. abfd->name will point to it. */
abfd = bfd_fdopenr (scratch_pathname, gnutarget, scratch_chan);
if (!abfd)
{
close (scratch_chan);
error ("Could not open `%s' as an executable file: %s",
scratch_pathname, bfd_errmsg (bfd_get_error ()));
}
/* Leave bfd open, core_xfer_memory and "info files" need it. */
so -> abfd = abfd;
abfd -> cacheable = true;
if (!bfd_check_format (abfd, bfd_object))
{
error ("\"%s\": not in executable format: %s.",
scratch_pathname, bfd_errmsg (bfd_get_error ()));
}
if (build_section_table (abfd, &so -> sections, &so -> sections_end))
{
error ("Can't find the file sections in `%s': %s",
bfd_get_filename (exec_bfd), bfd_errmsg (bfd_get_error ()));
}
for (p = so -> sections; p < so -> sections_end; p++)
{
/* Relocate the section binding addresses as recorded in the shared
object's file by the offset to get the address to which the
object was actually mapped. */
p -> addr += LM_OFFSET (so);
p -> endaddr += LM_OFFSET (so);
so -> lmend = (CORE_ADDR) max (p -> endaddr, so -> lmend);
if (STREQ (p -> the_bfd_section -> name, ".text"))
{
so -> textsection = p;
}
}
/* Free the file names, close the file now. */
do_cleanups (old_chain);
}
/*
LOCAL FUNCTION
locate_base -- locate the base address of dynamic linker structs
SYNOPSIS
CORE_ADDR locate_base (void)
DESCRIPTION
For both the SunOS and SVR4 shared library implementations, if the
inferior executable has been linked dynamically, there is a single
address somewhere in the inferior's data space which is the key to
locating all of the dynamic linker's runtime structures. This
address is the value of the symbol defined by the macro DEBUG_BASE.
The job of this function is to find and return that address, or to
return 0 if there is no such address (the executable is statically
linked for example).
For SunOS, the job is almost trivial, since the dynamic linker and
all of it's structures are statically linked to the executable at
link time. Thus the symbol for the address we are looking for has
already been added to the minimal symbol table for the executable's
objfile at the time the symbol file's symbols were read, and all we
have to do is look it up there. Note that we explicitly do NOT want
to find the copies in the shared library.
The SVR4 version is much more complicated because the dynamic linker
and it's structures are located in the shared C library, which gets
run as the executable's "interpreter" by the kernel. We have to go
to a lot more work to discover the address of DEBUG_BASE. Because
of this complexity, we cache the value we find and return that value
on subsequent invocations. Note there is no copy in the executable
symbol tables.
Irix 5 is basically like SunOS.
Note that we can assume nothing about the process state at the time
we need to find this address. We may be stopped on the first instruc-
tion of the interpreter (C shared library), the first instruction of
the executable itself, or somewhere else entirely (if we attached
to the process for example).
*/
static CORE_ADDR
locate_base ()
{
struct minimal_symbol *msymbol;
CORE_ADDR address = 0;
msymbol = lookup_minimal_symbol (DEBUG_BASE, NULL, symfile_objfile);
if ((msymbol != NULL) && (SYMBOL_VALUE_ADDRESS (msymbol) != 0))
{
address = SYMBOL_VALUE_ADDRESS (msymbol);
}
return (address);
}
/*
LOCAL FUNCTION
first_link_map_member -- locate first member in dynamic linker's map
SYNOPSIS
static struct link_map *first_link_map_member (void)
DESCRIPTION
Read in a copy of the first member in the inferior's dynamic
link map from the inferior's dynamic linker structures, and return
a pointer to the link map descriptor.
*/
static struct link_map *
first_link_map_member ()
{
struct obj_list *listp;
struct obj_list list_old;
struct link_map *lm;
static struct link_map first_lm;
CORE_ADDR lladdr;
CORE_ADDR next_lladdr;
/* We have not already read in the dynamic linking structures
from the inferior, lookup the address of the base structure. */
debug_base = locate_base ();
if (debug_base == 0)
return NULL;
/* Get address of first list entry. */
read_memory (debug_base, (char *) &listp, sizeof (struct obj_list *));
if (listp == NULL)
return NULL;
/* Get first list entry. */
lladdr = (CORE_ADDR) listp;
read_memory (lladdr, (char *) &list_old, sizeof (struct obj_list));
/* The first entry in the list is the object file we are debugging,
so skip it. */
next_lladdr = (CORE_ADDR) list_old.next;
#ifdef HANDLE_NEW_OBJ_LIST
if (list_old.data == NEW_OBJ_INFO_MAGIC)
{
Elf32_Obj_Info list_32;
read_memory (lladdr, (char *) &list_32, sizeof (Elf32_Obj_Info));
if (list_32.oi_size != sizeof (Elf32_Obj_Info))
return NULL;
next_lladdr = (CORE_ADDR) list_32.oi_next;
}
#endif
if (next_lladdr == 0)
return NULL;
first_lm.l_lladdr = next_lladdr;
lm = &first_lm;
return lm;
}
/*
LOCAL FUNCTION
next_link_map_member -- locate next member in dynamic linker's map
SYNOPSIS
static struct link_map *next_link_map_member (so_list_ptr)
DESCRIPTION
Read in a copy of the next member in the inferior's dynamic
link map from the inferior's dynamic linker structures, and return
a pointer to the link map descriptor.
*/
static struct link_map *
next_link_map_member (so_list_ptr)
struct so_list *so_list_ptr;
{
struct link_map *lm = &so_list_ptr -> lm;
CORE_ADDR next_lladdr = lm -> l_next;
static struct link_map next_lm;
if (next_lladdr == 0)
{
/* We have hit the end of the list, so check to see if any were
added, but be quiet if we can't read from the target any more. */
int status = 0;
if (lm -> l_variant == OBJ_LIST_OLD)
{
struct obj_list list_old;
status = target_read_memory (lm -> l_lladdr,
(char *) &list_old,
sizeof (struct obj_list));
next_lladdr = (CORE_ADDR) list_old.next;
}
#ifdef HANDLE_NEW_OBJ_LIST
else if (lm -> l_variant == OBJ_LIST_32)
{
Elf32_Obj_Info list_32;
status = target_read_memory (lm -> l_lladdr,
(char *) &list_32,
sizeof (Elf32_Obj_Info));
next_lladdr = (CORE_ADDR) list_32.oi_next;
}
#endif
if (status != 0 || next_lladdr == 0)
return NULL;
}
next_lm.l_lladdr = next_lladdr;
lm = &next_lm;
return lm;
}
/*
LOCAL FUNCTION
xfer_link_map_member -- set local variables from dynamic linker's map
SYNOPSIS
static void xfer_link_map_member (so_list_ptr, lm)
DESCRIPTION
Read in a copy of the requested member in the inferior's dynamic
link map from the inferior's dynamic linker structures, and fill
in the necessary so_list_ptr elements.
*/
static void
xfer_link_map_member (so_list_ptr, lm)
struct so_list *so_list_ptr;
struct link_map *lm;
{
struct obj_list list_old;
CORE_ADDR lladdr = lm -> l_lladdr;
struct link_map *new_lm = &so_list_ptr -> lm;
int errcode;
read_memory (lladdr, (char *) &list_old, sizeof (struct obj_list));
new_lm -> l_variant = OBJ_LIST_OLD;
new_lm -> l_lladdr = lladdr;
new_lm -> l_next = (CORE_ADDR) list_old.next;
#ifdef HANDLE_NEW_OBJ_LIST
if (list_old.data == NEW_OBJ_INFO_MAGIC)
{
Elf32_Obj_Info list_32;
read_memory (lladdr, (char *) &list_32, sizeof (Elf32_Obj_Info));
if (list_32.oi_size != sizeof (Elf32_Obj_Info))
return;
new_lm -> l_variant = OBJ_LIST_32;
new_lm -> l_next = (CORE_ADDR) list_32.oi_next;
target_read_string ((CORE_ADDR) list_32.oi_pathname,
&so_list_ptr -> so_name,
list_32.oi_pathname_len + 1, &errcode);
if (errcode != 0)
memory_error (errcode, (CORE_ADDR) list_32.oi_pathname);
LM_ADDR (so_list_ptr) = (CORE_ADDR) list_32.oi_ehdr;
LM_OFFSET (so_list_ptr) =
(CORE_ADDR) list_32.oi_ehdr - (CORE_ADDR) list_32.oi_orig_ehdr;
}
else
#endif
{
#if defined (_MIPS_SIM_NABI32) && _MIPS_SIM == _MIPS_SIM_NABI32
/* If we are compiling GDB under N32 ABI, the alignments in
the obj struct are different from the O32 ABI and we will get
wrong values when accessing the struct.
As a workaround we use fixed values which are good for
Irix 6.2. */
char buf[432];
read_memory ((CORE_ADDR) list_old.data, buf, sizeof (buf));
target_read_string (extract_address (&buf[236], 4),
&so_list_ptr -> so_name,
INT_MAX, &errcode);
if (errcode != 0)
memory_error (errcode, extract_address (&buf[236], 4));
LM_ADDR (so_list_ptr) = extract_address (&buf[196], 4);
LM_OFFSET (so_list_ptr) =
extract_address (&buf[196], 4) - extract_address (&buf[248], 4);
#else
struct obj obj_old;
read_memory ((CORE_ADDR) list_old.data, (char *) &obj_old,
sizeof (struct obj));
target_read_string ((CORE_ADDR) obj_old.o_path,
&so_list_ptr -> so_name,
INT_MAX, &errcode);
if (errcode != 0)
memory_error (errcode, (CORE_ADDR) obj_old.o_path);
LM_ADDR (so_list_ptr) = (CORE_ADDR) obj_old.o_praw;
LM_OFFSET (so_list_ptr) =
(CORE_ADDR) obj_old.o_praw - obj_old.o_base_address;
#endif
}
solib_map_sections (so_list_ptr);
}
/*
LOCAL FUNCTION
find_solib -- step through list of shared objects
SYNOPSIS
struct so_list *find_solib (struct so_list *so_list_ptr)
DESCRIPTION
This module contains the routine which finds the names of any
loaded "images" in the current process. The argument in must be
NULL on the first call, and then the returned value must be passed
in on subsequent calls. This provides the capability to "step" down
the list of loaded objects. On the last object, a NULL value is
returned.
*/
static struct so_list *
find_solib (so_list_ptr)
struct so_list *so_list_ptr; /* Last lm or NULL for first one */
{
struct so_list *so_list_next = NULL;
struct link_map *lm = NULL;
struct so_list *new;
if (so_list_ptr == NULL)
{
/* We are setting up for a new scan through the loaded images. */
if ((so_list_next = so_list_head) == NULL)
{
/* Find the first link map list member. */
lm = first_link_map_member ();
}
}
else
{
/* We have been called before, and are in the process of walking
the shared library list. Advance to the next shared object. */
lm = next_link_map_member (so_list_ptr);
so_list_next = so_list_ptr -> next;
}
if ((so_list_next == NULL) && (lm != NULL))
{
new = (struct so_list *) xmalloc (sizeof (struct so_list));
memset ((char *) new, 0, sizeof (struct so_list));
/* Add the new node as the next node in the list, or as the root
node if this is the first one. */
if (so_list_ptr != NULL)
{
so_list_ptr -> next = new;
}
else
{
so_list_head = new;
}
so_list_next = new;
xfer_link_map_member (new, lm);
}
return (so_list_next);
}
/* A small stub to get us past the arg-passing pinhole of catch_errors. */
static int
symbol_add_stub (arg)
char *arg;
{
register struct so_list *so = (struct so_list *) arg; /* catch_errs bogon */
CORE_ADDR text_addr = 0;
if (so -> textsection)
text_addr = so -> textsection -> addr;
else
{
asection *lowest_sect;
/* If we didn't find a mapped non zero sized .text section, set up
text_addr so that the relocation in symbol_file_add does no harm. */
lowest_sect = bfd_get_section_by_name (so -> abfd, ".text");
if (lowest_sect == NULL)
bfd_map_over_sections (so -> abfd, find_lowest_section,
(PTR) &lowest_sect);
if (lowest_sect)
text_addr = bfd_section_vma (so -> abfd, lowest_sect) + LM_OFFSET (so);
}
so -> objfile = symbol_file_add (so -> so_name, so -> from_tty,
text_addr,
0, 0, 0);
return (1);
}
/*
GLOBAL FUNCTION
solib_add -- add a shared library file to the symtab and section list
SYNOPSIS
void solib_add (char *arg_string, int from_tty,
struct target_ops *target)
DESCRIPTION
*/
void
solib_add (arg_string, from_tty, target)
char *arg_string;
int from_tty;
struct target_ops *target;
{
register struct so_list *so = NULL; /* link map state variable */
/* Last shared library that we read. */
struct so_list *so_last = NULL;
char *re_err;
int count;
int old;
if ((re_err = re_comp (arg_string ? arg_string : ".")) != NULL)
{
error ("Invalid regexp: %s", re_err);
}
/* Add the shared library sections to the section table of the
specified target, if any. */
if (target)
{
/* Count how many new section_table entries there are. */
so = NULL;
count = 0;
while ((so = find_solib (so)) != NULL)
{
if (so -> so_name[0])
{
count += so -> sections_end - so -> sections;
}
}
if (count)
{
int update_coreops;
/* We must update the to_sections field in the core_ops structure
here, otherwise we dereference a potential dangling pointer
for each call to target_read/write_memory within this routine. */
update_coreops = core_ops.to_sections == target->to_sections;
/* Reallocate the target's section table including the new size. */
if (target -> to_sections)
{
old = target -> to_sections_end - target -> to_sections;
target -> to_sections = (struct section_table *)
xrealloc ((char *)target -> to_sections,
(sizeof (struct section_table)) * (count + old));
}
else
{
old = 0;
target -> to_sections = (struct section_table *)
xmalloc ((sizeof (struct section_table)) * count);
}
target -> to_sections_end = target -> to_sections + (count + old);
/* Update the to_sections field in the core_ops structure
if needed. */
if (update_coreops)
{
core_ops.to_sections = target->to_sections;
core_ops.to_sections_end = target->to_sections_end;
}
/* Add these section table entries to the target's table. */
while ((so = find_solib (so)) != NULL)
{
if (so -> so_name[0])
{
count = so -> sections_end - so -> sections;
memcpy ((char *) (target -> to_sections + old),
so -> sections,
(sizeof (struct section_table)) * count);
old += count;
}
}
}
}
/* Now add the symbol files. */
while ((so = find_solib (so)) != NULL)
{
if (so -> so_name[0] && re_exec (so -> so_name))
{
so -> from_tty = from_tty;
if (so -> symbols_loaded)
{
if (from_tty)
{
printf_unfiltered ("Symbols already loaded for %s\n", so -> so_name);
}
}
else if (catch_errors
(symbol_add_stub, (char *) so,
"Error while reading shared library symbols:\n",
RETURN_MASK_ALL))
{
so_last = so;
so -> symbols_loaded = 1;
}
}
}
/* Getting new symbols may change our opinion about what is
frameless. */
if (so_last)
reinit_frame_cache ();
}
/*
LOCAL FUNCTION
info_sharedlibrary_command -- code for "info sharedlibrary"
SYNOPSIS
static void info_sharedlibrary_command ()
DESCRIPTION
Walk through the shared library list and print information
about each attached library.
*/
static void
info_sharedlibrary_command (ignore, from_tty)
char *ignore;
int from_tty;
{
register struct so_list *so = NULL; /* link map state variable */
int header_done = 0;
if (exec_bfd == NULL)
{
printf_unfiltered ("No exec file.\n");
return;
}
while ((so = find_solib (so)) != NULL)
{
if (so -> so_name[0])
{
if (!header_done)
{
printf_unfiltered("%-12s%-12s%-12s%s\n", "From", "To", "Syms Read",
"Shared Object Library");
header_done++;
}
printf_unfiltered ("%-12s",
local_hex_string_custom ((unsigned long) LM_ADDR (so),
"08l"));
printf_unfiltered ("%-12s",
local_hex_string_custom ((unsigned long) so -> lmend,
"08l"));
printf_unfiltered ("%-12s", so -> symbols_loaded ? "Yes" : "No");
printf_unfiltered ("%s\n", so -> so_name);
}
}
if (so_list_head == NULL)
{
printf_unfiltered ("No shared libraries loaded at this time.\n");
}
}
/*
GLOBAL FUNCTION
solib_address -- check to see if an address is in a shared lib
SYNOPSIS
char *solib_address (CORE_ADDR address)
DESCRIPTION
Provides a hook for other gdb routines to discover whether or
not a particular address is within the mapped address space of
a shared library. Any address between the base mapping address
and the first address beyond the end of the last mapping, is
considered to be within the shared library address space, for
our purposes.
For example, this routine is called at one point to disable
breakpoints which are in shared libraries that are not currently
mapped in.
*/
char *
solib_address (address)
CORE_ADDR address;
{
register struct so_list *so = 0; /* link map state variable */
while ((so = find_solib (so)) != NULL)
{
if (so -> so_name[0])
{
if ((address >= (CORE_ADDR) LM_ADDR (so)) &&
(address < (CORE_ADDR) so -> lmend))
return (so->so_name);
}
}
return (0);
}
/* Called by free_all_symtabs */
void
clear_solib()
{
struct so_list *next;
char *bfd_filename;
while (so_list_head)
{
if (so_list_head -> sections)
{
free ((PTR)so_list_head -> sections);
}
if (so_list_head -> abfd)
{
bfd_filename = bfd_get_filename (so_list_head -> abfd);
if (!bfd_close (so_list_head -> abfd))
warning ("cannot close \"%s\": %s",
bfd_filename, bfd_errmsg (bfd_get_error ()));
}
else
/* This happens for the executable on SVR4. */
bfd_filename = NULL;
next = so_list_head -> next;
if (bfd_filename)
free ((PTR)bfd_filename);
free (so_list_head->so_name);
free ((PTR)so_list_head);
so_list_head = next;
}
debug_base = 0;
}
/*
LOCAL FUNCTION
disable_break -- remove the "mapping changed" breakpoint
SYNOPSIS
static int disable_break ()
DESCRIPTION
Removes the breakpoint that gets hit when the dynamic linker
completes a mapping change.
*/
static int
disable_break ()
{
int status = 1;
/* Note that breakpoint address and original contents are in our address
space, so we just need to write the original contents back. */
if (memory_remove_breakpoint (breakpoint_addr, shadow_contents) != 0)
{
status = 0;
}
/* For the SVR4 version, we always know the breakpoint address. For the
SunOS version we don't know it until the above code is executed.
Grumble if we are stopped anywhere besides the breakpoint address. */
if (stop_pc != breakpoint_addr)
{
warning ("stopped at unknown breakpoint while handling shared libraries");
}
return (status);
}
/*
LOCAL FUNCTION
enable_break -- arrange for dynamic linker to hit breakpoint
SYNOPSIS
int enable_break (void)
DESCRIPTION
This functions inserts a breakpoint at the entry point of the
main executable, where all shared libraries are mapped in.
*/
static int
enable_break ()
{
if (symfile_objfile != NULL
&& target_insert_breakpoint (symfile_objfile->ei.entry_point,
shadow_contents) == 0)
{
breakpoint_addr = symfile_objfile->ei.entry_point;
return 1;
}
return 0;
}
/*
GLOBAL FUNCTION
solib_create_inferior_hook -- shared library startup support
SYNOPSIS
void solib_create_inferior_hook()
DESCRIPTION
When gdb starts up the inferior, it nurses it along (through the
shell) until it is ready to execute it's first instruction. At this
point, this function gets called via expansion of the macro
SOLIB_CREATE_INFERIOR_HOOK.
For SunOS executables, this first instruction is typically the
one at "_start", or a similar text label, regardless of whether
the executable is statically or dynamically linked. The runtime
startup code takes care of dynamically linking in any shared
libraries, once gdb allows the inferior to continue.
For SVR4 executables, this first instruction is either the first
instruction in the dynamic linker (for dynamically linked
executables) or the instruction at "start" for statically linked
executables. For dynamically linked executables, the system
first exec's /lib/libc.so.N, which contains the dynamic linker,
and starts it running. The dynamic linker maps in any needed
shared libraries, maps in the actual user executable, and then
jumps to "start" in the user executable.
For both SunOS shared libraries, and SVR4 shared libraries, we
can arrange to cooperate with the dynamic linker to discover the
names of shared libraries that are dynamically linked, and the
base addresses to which they are linked.
This function is responsible for discovering those names and
addresses, and saving sufficient information about them to allow
their symbols to be read at a later time.
FIXME
Between enable_break() and disable_break(), this code does not
properly handle hitting breakpoints which the user might have
set in the startup code or in the dynamic linker itself. Proper
handling will probably have to wait until the implementation is
changed to use the "breakpoint handler function" method.
Also, what if child has exit()ed? Must exit loop somehow.
*/
void
solib_create_inferior_hook()
{
if (!enable_break ())
{
warning ("shared library handler failed to enable breakpoint");
return;
}
/* Now run the target. It will eventually hit the breakpoint, at
which point all of the libraries will have been mapped in and we
can go groveling around in the dynamic linker structures to find
out what we need to know about them. */
clear_proceed_status ();
stop_soon_quietly = 1;
stop_signal = TARGET_SIGNAL_0;
do
{
target_resume (-1, 0, stop_signal);
wait_for_inferior ();
}
while (stop_signal != TARGET_SIGNAL_TRAP);
/* We are now either at the "mapping complete" breakpoint (or somewhere
else, a condition we aren't prepared to deal with anyway), so adjust
the PC as necessary after a breakpoint, disable the breakpoint, and
add any shared libraries that were mapped in. */
if (DECR_PC_AFTER_BREAK)
{
stop_pc -= DECR_PC_AFTER_BREAK;
write_register (PC_REGNUM, stop_pc);
}
if (!disable_break ())
{
warning ("shared library handler failed to disable breakpoint");
}
/* solib_add will call reinit_frame_cache.
But we are stopped in the startup code and we might not have symbols
for the startup code, so heuristic_proc_start could be called
and will put out an annoying warning.
Delaying the resetting of stop_soon_quietly until after symbol loading
suppresses the warning. */
if (auto_solib_add)
solib_add ((char *) 0, 0, (struct target_ops *) 0);
stop_soon_quietly = 0;
}
/*
LOCAL FUNCTION
sharedlibrary_command -- handle command to explicitly add library
SYNOPSIS
static void sharedlibrary_command (char *args, int from_tty)
DESCRIPTION
*/
static void
sharedlibrary_command (args, from_tty)
char *args;
int from_tty;
{
dont_repeat ();
solib_add (args, from_tty, (struct target_ops *) 0);
}
void
_initialize_solib()
{
add_com ("sharedlibrary", class_files, sharedlibrary_command,
"Load shared object library symbols for files matching REGEXP.");
add_info ("sharedlibrary", info_sharedlibrary_command,
"Status of loaded shared object libraries.");
add_show_from_set
(add_set_cmd ("auto-solib-add", class_support, var_zinteger,
(char *) &auto_solib_add,
"Set autoloading of shared library symbols.\n\
If nonzero, symbols from all shared object libraries will be loaded\n\
automatically when the inferior begins execution or when the dynamic linker\n\
informs gdb that a new library has been loaded. Otherwise, symbols\n\
must be loaded manually, using `sharedlibrary'.",
&setlist),
&showlist);
}
/* Register that we are able to handle irix5 core file formats.
This really is bfd_target_unknown_flavour */
static struct core_fns irix5_core_fns =
{
bfd_target_unknown_flavour,
fetch_core_registers,
NULL
};
void
_initialize_core_irix5 ()
{
add_core_fns (&irix5_core_fns);
}
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