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2004-06-09 Andrew Cagney <cagney@gnu.org>

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* solib-svr4.c [HANDLE_SVR4_EXEC_EMULATORS]: Delete #ifdef code.
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Andrew Cagney 2004-06-09 20:03:33 +00:00
parent 2d62ecc7b6
commit 4b38d6f1a4
2 changed files with 2 additions and 132 deletions
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2
gdb/ChangeLog
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@ -1,5 +1,7 @@
2004-06-09 Andrew Cagney <cagney@gnu.org>
* solib-svr4.c [HANDLE_SVR4_EXEC_EMULATORS]: Delete #ifdef code.
* config/ia64/tm-linux.h (TARGET_ELF64): Delete macro, Update
copyright.
* config/ia64/tm-aix.h (TARGET_ELF64): Ditto.

132
gdb/solib-svr4.c
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@ -272,133 +272,6 @@ bfd_lookup_symbol (bfd *abfd, char *symname, flagword sect_flags)
return symaddr;
}
#ifdef HANDLE_SVR4_EXEC_EMULATORS
/*
Solaris BCP (the part of Solaris which allows it to run SunOS4
a.out files) throws in another wrinkle. Solaris does not fill
in the usual a.out link map structures when running BCP programs,
the only way to get at them is via groping around in the dynamic
linker.
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.
Note that we can assume nothing about the process state at the time
we need to find these structures. We may be stopped on the first
instruction 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 char *debug_base_symbols[] =
{
"r_debug", /* Solaris 2.3 */
"_r_debug", /* Solaris 2.1, 2.2 */
NULL
};
static int look_for_base (int, CORE_ADDR);
/*
LOCAL FUNCTION
look_for_base -- examine file for each mapped address segment
SYNOPSYS
static int look_for_base (int fd, CORE_ADDR baseaddr)
DESCRIPTION
This function is passed to proc_iterate_over_mappings, which
causes it to get called once for each mapped address space, with
an open file descriptor for the file mapped to that space, and the
base address of that mapped space.
Our job is to find the debug base symbol in the file that this
fd is open on, if it exists, and if so, initialize the dynamic
linker structure base address debug_base.
Note that this is a computationally expensive proposition, since
we basically have to open a bfd on every call, so we specifically
avoid opening the exec file.
*/
static int
look_for_base (int fd, CORE_ADDR baseaddr)
{
bfd *interp_bfd;
CORE_ADDR address = 0;
char **symbolp;
/* If the fd is -1, then there is no file that corresponds to this
mapped memory segment, so skip it. Also, if the fd corresponds
to the exec file, skip it as well. */
if (fd == -1
|| (exec_bfd != NULL
&& fdmatch (fileno ((FILE *) (exec_bfd->iostream)), fd)))
{
return (0);
}
/* Try to open whatever random file this fd corresponds to. Note that
we have no way currently to find the filename. Don't gripe about
any problems we might have, just fail. */
if ((interp_bfd = bfd_fdopenr ("unnamed", gnutarget, fd)) == NULL)
{
return (0);
}
if (!bfd_check_format (interp_bfd, bfd_object))
{
/* FIXME-leak: on failure, might not free all memory associated with
interp_bfd. */
bfd_close (interp_bfd);
return (0);
}
/* Now try to find our debug base symbol in this file, which we at
least know to be a valid ELF executable or shared library. */
for (symbolp = debug_base_symbols; *symbolp != NULL; symbolp++)
{
address = bfd_lookup_symbol (interp_bfd, *symbolp, 0);
if (address != 0)
{
break;
}
}
if (address == 0)
{
/* FIXME-leak: on failure, might not free all memory associated with
interp_bfd. */
bfd_close (interp_bfd);
return (0);
}
/* Eureka! We found the symbol. But now we may need to relocate it
by the base address. If the symbol's value is less than the base
address of the shared library, then it hasn't yet been relocated
by the dynamic linker, and we have to do it ourself. FIXME: Note
that we make the assumption that the first segment that corresponds
to the shared library has the base address to which the library
was relocated. */
if (address < baseaddr)
{
address += baseaddr;
}
debug_base = address;
/* FIXME-leak: on failure, might not free all memory associated with
interp_bfd. */
bfd_close (interp_bfd);
return (1);
}
#endif /* HANDLE_SVR4_EXEC_EMULATORS */
/*
LOCAL FUNCTION
@ -579,11 +452,6 @@ locate_base (void)
if (exec_bfd != NULL
&& bfd_get_flavour (exec_bfd) == bfd_target_elf_flavour)
debug_base = elf_locate_base ();
#ifdef HANDLE_SVR4_EXEC_EMULATORS
/* Try it the hard way for emulated executables. */
else if (!ptid_equal (inferior_ptid, null_ptid) && target_has_execution)
proc_iterate_over_mappings (look_for_base);
#endif
}
return (debug_base);
}