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2003-04-22  Roland McGrath  <roland@redhat.com>

	* elf/elf.h (AT_SYSINFO_EHDR): New macro, replaces AT_SYSINFO_EH_FRAME.
	* sysdeps/generic/ldsodefs.h (struct rtld_global): Remove
	dl_sysinfo_eh_frame member, add dl_sysinfo_dso member instead.
	* elf/dl-support.c: Update defn.
	* sysdeps/generic/libc-start.c: Don't call __register_frame_info_bases.
	* sysdeps/generic/dl-sysdep.c (_dl_sysdep_start) [NEED_DL_SYSINFO]:
	Set GL(dl_sysinfo_dso) from AT_SYSINFO_EHDR.
	(_dl_show_auxv): Grok AT_SYSINFO_EHDR, not AT_SYSINFO_EH_FRAME.
	* elf/rtld.c (dl_main) [NEED_DL_SYSINFO]: If GL(dl_sysinfo_dso) is
	set, set up a link_map for the preloaded, prelinked object.
This commit is contained in:
Ulrich Drepper 2003-05-04 04:30:13 +00:00
parent 003f9e7223
commit f866314b89
6 changed files with 87 additions and 43 deletions
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13
ChangeLog
View File

@ -1,3 +1,16 @@
2003-04-22 Roland McGrath <roland@redhat.com>
* elf/elf.h (AT_SYSINFO_EHDR): New macro, replaces AT_SYSINFO_EH_FRAME.
* sysdeps/generic/ldsodefs.h (struct rtld_global): Remove
dl_sysinfo_eh_frame member, add dl_sysinfo_dso member instead.
* elf/dl-support.c: Update defn.
* sysdeps/generic/libc-start.c: Don't call __register_frame_info_bases.
* sysdeps/generic/dl-sysdep.c (_dl_sysdep_start) [NEED_DL_SYSINFO]:
Set GL(dl_sysinfo_dso) from AT_SYSINFO_EHDR.
(_dl_show_auxv): Grok AT_SYSINFO_EHDR, not AT_SYSINFO_EH_FRAME.
* elf/rtld.c (dl_main) [NEED_DL_SYSINFO]: If GL(dl_sysinfo_dso) is
set, set up a link_map for the preloaded, prelinked object.
2003-05-03 Roland McGrath <roland@redhat.com>
* sysdeps/gnu/Makefile (generated): Append errlist-compat.c here, ...

4
elf/dl-support.c
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@ -127,8 +127,8 @@ size_t _dl_phnum;
#ifdef NEED_DL_SYSINFO
/* Needed for improved syscall handling on at least x86/Linux. */
uintptr_t _dl_sysinfo = DL_SYSINFO_DEFAULT;
/* Address of the unwind info for the vsyscall page. */
uintptr_t _dl_sysinfo_eh_frame;
/* Address of the ELF headers in the vsyscall page. */
const ElfW(Ehdr) *_dl_sysinfo_dso;
#endif
/* During the program run we must not modify the global data of

42
elf/rtld.c
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@ -1069,6 +1069,48 @@ of this helper program; chances are you did not intend to run this program.\n\
assert (i == npreloads);
}
#ifdef NEED_DL_SYSINFO
if (GL(dl_sysinfo_dso) != NULL)
{
/* We have a prelinked DSO preloaded by the system. */
GL(dl_sysinfo) = GL(dl_sysinfo_dso)->e_entry;
/* Do an abridged version of the work _dl_map_object_from_fd would do
to map in the object. It's already mapped and prelinked (and
better be, since it's read-only and so we couldn't relocate it).
We just want our data structures to describe it as if we had just
mapped and relocated it normally. */
struct link_map *l = _dl_new_object ((char *) "", "", lt_library, NULL);
if (__builtin_expect (l != NULL, 1))
{
l->l_phdr = ((const void *) GL(dl_sysinfo_dso)
+ GL(dl_sysinfo_dso)->e_phoff);
l->l_phnum = GL(dl_sysinfo_dso)->e_phnum;
for (uint_fast16_t i = 0; i < l->l_phnum; ++i)
{
const ElfW(Phdr) *const ph = &l->l_phdr[i];
if (ph->p_type == PT_DYNAMIC)
{
l->l_ld = (void *) ph->p_vaddr;
l->l_ldnum = ph->p_memsz / sizeof (ElfW(Dyn));
break;
}
if (ph->p_type == PT_LOAD)
assert ((void *) ph->p_vaddr == GL(dl_sysinfo_dso));
}
elf_get_dynamic_info (l);
_dl_setup_hash (l);
l->l_relocated = 1;
/* Now that we have the info handy, use the DSO image's soname
so this object can be looked up by name. */
if (l->l_info[DT_SONAME] != NULL)
l->l_libname->name = ((char *) D_PTR (l, l_info[DT_STRTAB])
+ l->l_info[DT_SONAME]->d_un.d_val);
}
}
#endif
/* Load all the libraries specified by DT_NEEDED entries. If LD_PRELOAD
specified some libraries to load, these are inserted before the actual
dependencies in the executable's searchlist for symbol resolution. */

52
sysdeps/generic/dl-sysdep.c
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@ -139,8 +139,8 @@ _dl_sysdep_start (void **start_argptr,
case AT_SYSINFO:
GL(dl_sysinfo) = av->a_un.a_val;
break;
case AT_SYSINFO_EH_FRAME:
GL(dl_sysinfo_eh_frame) = av->a_un.a_val;
case AT_SYSINFO_EHDR:
GL(dl_sysinfo_dso) = av->a_un.a_ptr;
break;
#endif
#ifdef DL_PLATFORM_AUXV
@ -227,32 +227,34 @@ _dl_show_auxv (void)
{
static const struct
{
const char label[23];
const char label[20];
enum { dec, hex, str } form;
} auxvars[] =
{
[AT_EXECFD - 2] = { "AT_EXECFD: ", dec },
[AT_PHDR - 2] = { "AT_PHDR: 0x", hex },
[AT_PHENT - 2] = { "AT_PHENT: ", dec },
[AT_PHNUM - 2] = { "AT_PHNUM: ", dec },
[AT_PAGESZ - 2] = { "AT_PAGESZ: ", dec },
[AT_BASE - 2] = { "AT_BASE: 0x", hex },
[AT_FLAGS - 2] = { "AT_FLAGS: 0x", hex },
[AT_ENTRY - 2] = { "AT_ENTRY: 0x", hex },
[AT_NOTELF - 2] = { "AT_NOTELF: ", hex },
[AT_UID - 2] = { "AT_UID: ", dec },
[AT_EUID - 2] = { "AT_EUID: ", dec },
[AT_GID - 2] = { "AT_GID: ", dec },
[AT_EGID - 2] = { "AT_EGID: ", dec },
[AT_PLATFORM - 2] = { "AT_PLATFORM: ", str },
[AT_HWCAP - 2] = { "AT_HWCAP: ", hex },
[AT_CLKTCK - 2] = { "AT_CLKTCK: ", dec },
[AT_FPUCW - 2] = { "AT_FPUCW: ", hex },
[AT_DCACHEBSIZE - 2] = { "AT_DCACHEBSIZE: 0x", hex },
[AT_ICACHEBSIZE - 2] = { "AT_ICACHEBSIZE: 0x", hex },
[AT_UCACHEBSIZE - 2] = { "AT_UCACHEBSIZE: 0x", hex },
[AT_SYSINFO - 2] = { "AT_SYSINFO: 0x", hex },
[AT_SYSINFO_EH_FRAME - 2] = { "AT_SYSINFO_EH_FRAME: 0x", hex }
[AT_EXECFD - 2] = { "AT_EXECFD: ", dec },
[AT_PHDR - 2] = { "AT_PHDR: 0x", hex },
[AT_PHENT - 2] = { "AT_PHENT: ", dec },
[AT_PHNUM - 2] = { "AT_PHNUM: ", dec },
[AT_PAGESZ - 2] = { "AT_PAGESZ: ", dec },
[AT_BASE - 2] = { "AT_BASE: 0x", hex },
[AT_FLAGS - 2] = { "AT_FLAGS: 0x", hex },
[AT_ENTRY - 2] = { "AT_ENTRY: 0x", hex },
[AT_NOTELF - 2] = { "AT_NOTELF: ", hex },
[AT_UID - 2] = { "AT_UID: ", dec },
[AT_EUID - 2] = { "AT_EUID: ", dec },
[AT_GID - 2] = { "AT_GID: ", dec },
[AT_EGID - 2] = { "AT_EGID: ", dec },
[AT_PLATFORM - 2] = { "AT_PLATFORM: ", str },
[AT_HWCAP - 2] = { "AT_HWCAP: ", hex },
[AT_CLKTCK - 2] = { "AT_CLKTCK: ", dec },
[AT_FPUCW - 2] = { "AT_FPUCW: ", hex },
[AT_DCACHEBSIZE - 2] = { "AT_DCACHEBSIZE: 0x", hex },
[AT_ICACHEBSIZE - 2] = { "AT_ICACHEBSIZE: 0x", hex },
[AT_UCACHEBSIZE - 2] = { "AT_UCACHEBSIZE: 0x", hex },
#ifdef DL_NEED_SYSINFO
[AT_SYSINFO - 2] = { "AT_SYSINFO: 0x", hex },
[AT_SYSINFO_EHDR - 2] = { "AT_SYSINFO_EHDR: 0x", hex }
#endif
};
unsigned int idx = (unsigned int) (av->a_type - 2);

5
sysdeps/generic/ldsodefs.h
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@ -395,8 +395,9 @@ struct rtld_global
/* Syscall handling improvements. This is very specific to x86. */
EXTERN uintptr_t _dl_sysinfo;
/* Address of the unwind info for the vsyscall page. */
EXTERN uintptr_t _dl_sysinfo_eh_frame;
/* The vsyscall page is a virtual DSO pre-mapped by the kernel.
This points to its ELF header. */
EXTERN const ElfW(Ehdr) *_dl_sysinfo_dso;
#endif
#ifdef SHARED

14
sysdeps/generic/libc-start.c
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@ -28,13 +28,6 @@ extern void __libc_init_first (int argc, char **argv, char **envp);
extern int __libc_multiple_libcs;
extern void *__libc_stack_end;
#ifdef NEED_DL_SYSINFO
# include "unwind-dw2-fde.h"
extern __typeof (__register_frame_info_bases)
INTUSE(__register_frame_info_bases);
static struct object eh_obj;
#endif
#include <tls.h>
#ifndef SHARED
# include <dl-osinfo.h>
@ -157,13 +150,6 @@ LIBC_START_MAIN (int (*main) (int, char **, char ** MAIN_AUXVEC_DECL),
__libc_check_standard_fds ();
#endif
#ifdef NEED_DL_SYSINFO
/* Register the kernel's unwind table. */
if (GL(dl_sysinfo_eh_frame) != 0)
INTUSE(__register_frame_info_bases) ((void *) GL(dl_sysinfo_eh_frame),
&eh_obj, 0, 0);
#endif
/* Register the destructor of the dynamic linker if there is any. */
if (__builtin_expect (rtld_fini != NULL, 1))
__cxa_atexit ((void (*) (void *)) rtld_fini, NULL, NULL);