Update.
* sysdeps/generic/dl-sysdep.c (_dl_sysdep_start): If HAVE_AUX_XID is defined don't look whether the AT_*ID values were set. If HAVE_AUX_PAGESIZE is defined don't look whether the pagesize is set. (_dl_show_auxv): Rewrite to avoid switch statement. * sysdeps/unix/sysv/linux/kernel-features.h: Define __ASSUME_AT_PAGESIZE for kernel >= 2.4.1. * sysdeps/unix/sysv/linux/ldsodefs.h: Define HAVE_AUX_XID. Define HAVE_AUX_PAGESIZE if __ASSUME_AT_PAGESIZE is defined.
This commit is contained in:
Ulrich Drepper
parent
5287b1d872
commit
4e56fdbce3
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@ -1,5 +1,14 @@
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2001-01-18 Ulrich Drepper <drepper@redhat.com>
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* sysdeps/generic/dl-sysdep.c (_dl_sysdep_start): If HAVE_AUX_XID is
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defined don't look whether the AT_*ID values were set.
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If HAVE_AUX_PAGESIZE is defined don't look whether the pagesize is set.
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(_dl_show_auxv): Rewrite to avoid switch statement.
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* sysdeps/unix/sysv/linux/kernel-features.h: Define
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__ASSUME_AT_PAGESIZE for kernel >= 2.4.1.
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* sysdeps/unix/sysv/linux/ldsodefs.h: Define HAVE_AUX_XID.
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Define HAVE_AUX_PAGESIZE if __ASSUME_AT_PAGESIZE is defined.
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* sysdeps/unix/sysv/linux/fxstat64.c: Add one __builtin_expect.
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* sysdeps/unix/sysv/linux/lxstat64.c: Likewise.
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* sysdeps/unix/sysv/linux/xstat64.c: Likewise.
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@ -17,6 +17,7 @@
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include <assert.h>
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#include <elf.h>
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#include <errno.h>
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#include <fcntl.h>
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@ -87,7 +88,10 @@ _dl_sysdep_start (void **start_argptr,
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uid_t euid = 0;
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gid_t gid = 0;
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gid_t egid = 0;
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unsigned int seen;
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#ifndef HAVE_AUX_X
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unsigned int seen = 0;
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# define M(type) (1 << (type))
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#endif
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DL_FIND_ARG_COMPONENTS (start_argptr, _dl_argc, _dl_argv, _environ,
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_dl_auxv);
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@ -95,9 +99,6 @@ _dl_sysdep_start (void **start_argptr,
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user_entry = (ElfW(Addr)) &ENTRY_POINT;
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_dl_platform = NULL; /* Default to nothing known about the platform. */
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seen = 0;
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#define M(type) (1 << (type))
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for (av = _dl_auxv; av->a_type != AT_NULL; seen |= M ((++av)->a_type))
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switch (av->a_type)
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{
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@ -149,16 +150,20 @@ _dl_sysdep_start (void **start_argptr,
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/* Linux doesn't provide us with any of these values on the stack
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when the dynamic linker is run directly as a program. */
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#define SEE(UID, uid) if ((seen & M (AT_##UID)) == 0) uid = __get##uid ()
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#ifndef HAVE_AUX_XID
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# define SEE(UID, uid) if ((seen & M (AT_##UID)) == 0) uid = __get##uid ()
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SEE (UID, uid);
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SEE (GID, gid);
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SEE (EUID, euid);
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SEE (EGID, egid);
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#endif
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__libc_enable_secure = uid != euid || gid != egid;
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#ifndef HAVE_AUX_PAGESIZE
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if (_dl_pagesize == 0)
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_dl_pagesize = __getpagesize ();
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#endif
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#ifdef DL_SYSDEP_INIT
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DL_SYSDEP_INIT;
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@ -206,87 +211,56 @@ _dl_show_auxv (void)
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/* Terminate string. */
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buf[63] = '\0';
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/* The following code assumes that the AT_* values are encoded
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starting from 0 with AT_NULL, 1 for AT_IGNORE, and all other values
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close by (otherwise the array will be too large). In case we have
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to support a platform where these requirements are not fulfilled
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some alternative implementation has to be used. */
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for (av = _dl_auxv; av->a_type != AT_NULL; ++av)
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switch (av->a_type)
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{
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static const struct
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{
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case AT_PHDR:
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_dl_sysdep_message ("AT_PHDR: 0x",
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_itoa_word (av->a_un.a_val, buf + sizeof buf - 1,
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16, 0),
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"\n", NULL);
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break;
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case AT_PHNUM:
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_dl_sysdep_message ("AT_PHNUM: ",
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_itoa_word (av->a_un.a_val, buf + sizeof buf - 1,
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10, 0),
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"\n", NULL);
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break;
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case AT_PAGESZ:
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_dl_sysdep_message ("AT_PAGESZ: ",
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_itoa_word (av->a_un.a_val, buf + sizeof buf - 1,
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10, 0),
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"\n", NULL);
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break;
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case AT_ENTRY:
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_dl_sysdep_message ("AT_ENTRY: 0x",
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_itoa_word (av->a_un.a_val, buf + sizeof buf - 1,
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16, 0),
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"\n", NULL);
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break;
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case AT_BASE:
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_dl_sysdep_message ("AT_BASE: 0x",
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_itoa_word (av->a_un.a_val, buf + sizeof buf - 1,
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16, 0),
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"\n", NULL);
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break;
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case AT_UID:
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_dl_sysdep_message ("AT_UID: ",
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_itoa_word (av->a_un.a_val, buf + sizeof buf - 1,
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10, 0),
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"\n", NULL);
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break;
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case AT_GID:
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_dl_sysdep_message ("AT_GID: ",
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_itoa_word (av->a_un.a_val, buf + sizeof buf - 1,
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10, 0),
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"\n", NULL);
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break;
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case AT_EUID:
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_dl_sysdep_message ("AT_EUID: ",
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_itoa_word (av->a_un.a_val, buf + sizeof buf - 1,
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10, 0),
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"\n", NULL);
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break;
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case AT_EGID:
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_dl_sysdep_message ("AT_EGID: ",
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_itoa_word (av->a_un.a_val, buf + sizeof buf - 1,
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10, 0),
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"\n", NULL);
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break;
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case AT_PLATFORM:
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_dl_sysdep_message ("AT_PLATFORM: ", av->a_un.a_ptr, "\n", NULL);
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break;
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case AT_HWCAP:
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_dl_hwcap = av->a_un.a_val;
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if (_dl_procinfo (_dl_hwcap) < 0)
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_dl_sysdep_message ("AT_HWCAP: ",
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_itoa_word (_dl_hwcap, buf + sizeof buf - 1,
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16, 0),
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"\n", NULL);
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break;
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case AT_CLKTCK:
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_dl_sysdep_message ("AT_CLKTCK: ",
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_itoa_word (av->a_un.a_val, buf + sizeof buf - 1,
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10, 0),
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"\n", NULL);
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break;
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case AT_FPUCW:
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_dl_sysdep_message ("AT_FPUCW: ",
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_itoa_word (av->a_un.a_val, buf + sizeof buf - 1,
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10, 0),
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"\n", NULL);
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break;
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}
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const char label[16];
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enum { dec, hex, str } form;
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} auxvars[] =
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{
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[AT_EXECFD - 2] = { "AT_EXECFD: ", dec },
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[AT_PHDR - 2] = { "AT_PHDR: 0x", hex },
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[AT_PHENT - 2] = { "AT_PHENT: ", dec },
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[AT_PHNUM - 2] = { "AT_PHNUM: ", dec },
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[AT_PAGESZ - 2] = { "AT_PAGESZ: ", dec },
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[AT_BASE - 2] = { "AT_BASE: 0x", hex },
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[AT_FLAGS - 2] = { "AT_FLAGS: 0x", hex },
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[AT_ENTRY - 2] = { "AT_ENTRY: 0x", hex },
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[AT_NOTELF - 2] = { "AT_NOTELF: ", hex },
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[AT_UID - 2] = { "AT_UID: ", dec },
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[AT_EUID - 2] = { "AT_EUID: ", dec },
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[AT_GID - 2] = { "AT_GID: ", dec },
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[AT_EGID - 2] = { "AT_EGID: ", dec },
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[AT_PLATFORM - 2] = { "AT_PLATFORM: ", str },
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[AT_HWCAP - 2] = { "AT_HWCAP: ", hex },
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[AT_CLKTCK - 2] = { "AT_CLKTCK: ", dec },
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[AT_FPUCW - 2] = { "AT_FPUCW: ", hex }
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};
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unsigned int idx = (unsigned int) (av->a_type - 2);
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assert (AT_NULL == 0);
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assert (AT_IGNORE == 1);
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if (idx < sizeof (auxvars) / sizeof (auxvars[0]))
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{
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if (av->a_type != AT_HWCAP || _dl_procinfo (av->a_un.a_val) < 0)
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{
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const char *val = av->a_un.a_ptr;
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if (__builtin_expect (auxvars[idx].form, dec) == dec)
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val = _itoa_word (av->a_un.a_val, buf + sizeof buf - 1, 10, 0);
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else if (__builtin_expect (auxvars[idx].form, hex) == hex)
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val = _itoa_word (av->a_un.a_val, buf + sizeof buf - 1, 16, 0);
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_dl_sysdep_message (auxvars[idx].label, val, "\n", NULL);
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}
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}
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}
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}
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@ -1,6 +1,6 @@
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/* Set flags signalling availability of kernel features based on given
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kernel version number.
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Copyright (C) 1999, 2000 Free Software Foundation, Inc.
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Copyright (C) 1999, 2000, 2001 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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@ -157,3 +157,9 @@
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#if __LINUX_KERNEL_VERSION >= 131939
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# define __ASSUME_O_DIRECTORY 1
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#endif
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/* Starting with one of the 2.4.0 pre-releases the Linux kernel passes
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up the page size information. */
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#if __LINUX_KERNEL_VERSION >= 132097
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# define __ASSUME_AT_PAGESIZE 1
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#endif
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@ -19,6 +19,8 @@
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#ifndef _LDSODEFS_H
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#include "kernel-features.h"
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/* Get the real definitions. */
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#include_next <ldsodefs.h>
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@ -30,4 +32,14 @@
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/* Used by static binaries to check the auxiliary vector. */
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extern void _dl_aux_init (ElfW(auxv_t) *av) internal_function;
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/* We can assume that the kernel always provides the AT_UID, AT_EUID,
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AT_GID, and AT_EGID values in the auxiliary vector. */
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#define HAVE_AUX_XID
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/* Starting with one of the 2.4.0 pre-releases the Linux kernel passes
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up the page size information. */
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#if __ASSUME_AT_PAGESIZE
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# define HAVE_AUX_PAGESIZE
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#endif
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#endif /* ldsodefs.h */
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