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Move _dl_important_hwcaps to dl-hwcaps.c
This commit is contained in:
H.J. Lu
parent
1d1b34df90
commit
53cea63e99
@ -1,5 +1,12 @@
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2012-10-05 H.J. Lu <hongjiu.lu@intel.com>
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* elf/Makefile (dl-routines): Add hwcaps.
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* elf/dl-support.c (_dl_important_hwcaps): Removed.
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* elf/dl-sysdep.c (_DL_FIRST_EXTRA): Likewise.
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(_dl_important_hwcaps): Moved to ...
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* elf/dl-hwcaps.c: Here. New file.
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* sysdeps/mach/hurd/dl-sysdep.c (_dl_important_hwcaps): Removed.
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[BZ #14557]
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* elf/setup-vdso.h (setup_vdso): Set GL(dl_nns) to 1 for vDSO
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if IS_IN_rtld isn't defined.
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@ -28,7 +28,7 @@ routines = $(dl-routines) dl-support dl-iteratephdr \
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# The core dynamic linking functions are in libc for the static and
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# profiled libraries.
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dl-routines = $(addprefix dl-,load lookup object reloc deps \
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dl-routines = $(addprefix dl-,load lookup object reloc deps hwcaps \
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runtime error init fini debug misc \
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version profile conflict tls origin scope \
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execstack caller open close trampoline)
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279
elf/dl-hwcaps.c
Normal file
279
elf/dl-hwcaps.c
Normal file
@ -0,0 +1,279 @@
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/* Hardware capability support for run-time dynamic loader.
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Copyright (C) 2012 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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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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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 <libintl.h>
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#include <unistd.h>
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#include <ldsodefs.h>
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#include <dl-procinfo.h>
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#ifdef _DL_FIRST_PLATFORM
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# define _DL_FIRST_EXTRA (_DL_FIRST_PLATFORM + _DL_PLATFORMS_COUNT)
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#else
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# define _DL_FIRST_EXTRA _DL_HWCAP_COUNT
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#endif
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/* Return an array of useful/necessary hardware capability names. */
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const struct r_strlenpair *
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internal_function
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_dl_important_hwcaps (const char *platform, size_t platform_len, size_t *sz,
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size_t *max_capstrlen)
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{
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/* Determine how many important bits are set. */
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uint64_t masked = GLRO(dl_hwcap) & GLRO(dl_hwcap_mask);
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size_t cnt = platform != NULL;
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size_t n, m;
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size_t total;
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struct r_strlenpair *temp;
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struct r_strlenpair *result;
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struct r_strlenpair *rp;
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char *cp;
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/* Count the number of bits set in the masked value. */
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for (n = 0; (~((1ULL << n) - 1) & masked) != 0; ++n)
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if ((masked & (1ULL << n)) != 0)
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++cnt;
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#if defined NEED_DL_SYSINFO || defined NEED_DL_SYSINFO_DSO
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/* The system-supplied DSO can contain a note of type 2, vendor "GNU".
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This gives us a list of names to treat as fake hwcap bits. */
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const char *dsocaps = NULL;
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size_t dsocapslen = 0;
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if (GLRO(dl_sysinfo_map) != NULL)
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{
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const ElfW(Phdr) *const phdr = GLRO(dl_sysinfo_map)->l_phdr;
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const ElfW(Word) phnum = GLRO(dl_sysinfo_map)->l_phnum;
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for (uint_fast16_t i = 0; i < phnum; ++i)
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if (phdr[i].p_type == PT_NOTE)
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{
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const ElfW(Addr) start = (phdr[i].p_vaddr
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+ GLRO(dl_sysinfo_map)->l_addr);
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const struct
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{
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ElfW(Word) vendorlen;
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ElfW(Word) datalen;
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ElfW(Word) type;
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} *note = (const void *) start;
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while ((ElfW(Addr)) (note + 1) - start < phdr[i].p_memsz)
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{
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#define ROUND(len) (((len) + sizeof (ElfW(Word)) - 1) & -sizeof (ElfW(Word)))
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if (note->type == NT_GNU_HWCAP
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&& note->vendorlen == sizeof "GNU"
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&& !memcmp ((note + 1), "GNU", sizeof "GNU")
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&& note->datalen > 2 * sizeof (ElfW(Word)) + 2)
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{
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const ElfW(Word) *p = ((const void *) (note + 1)
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+ ROUND (sizeof "GNU"));
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cnt += *p++;
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++p; /* Skip mask word. */
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dsocaps = (const char *) p;
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dsocapslen = note->datalen - sizeof *p * 2;
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break;
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}
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note = ((const void *) (note + 1)
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+ ROUND (note->vendorlen) + ROUND (note->datalen));
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#undef ROUND
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}
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if (dsocaps != NULL)
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break;
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}
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}
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#endif
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/* For TLS enabled builds always add 'tls'. */
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++cnt;
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/* Create temporary data structure to generate result table. */
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temp = (struct r_strlenpair *) alloca (cnt * sizeof (*temp));
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m = 0;
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#if defined NEED_DL_SYSINFO || defined NEED_DL_SYSINFO_DSO
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if (dsocaps != NULL)
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{
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const ElfW(Word) mask = ((const ElfW(Word) *) dsocaps)[-1];
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GLRO(dl_hwcap) |= (uint64_t) mask << _DL_FIRST_EXTRA;
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/* Note that we add the dsocaps to the set already chosen by the
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LD_HWCAP_MASK environment variable (or default HWCAP_IMPORTANT).
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So there is no way to request ignoring an OS-supplied dsocap
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string and bit like you can ignore an OS-supplied HWCAP bit. */
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GLRO(dl_hwcap_mask) |= (uint64_t) mask << _DL_FIRST_EXTRA;
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size_t len;
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for (const char *p = dsocaps; p < dsocaps + dsocapslen; p += len + 1)
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{
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uint_fast8_t bit = *p++;
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len = strlen (p);
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/* Skip entries that are not enabled in the mask word. */
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if (__builtin_expect (mask & ((ElfW(Word)) 1 << bit), 1))
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{
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temp[m].str = p;
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temp[m].len = len;
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++m;
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}
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else
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--cnt;
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}
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}
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#endif
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for (n = 0; masked != 0; ++n)
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if ((masked & (1ULL << n)) != 0)
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{
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temp[m].str = _dl_hwcap_string (n);
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temp[m].len = strlen (temp[m].str);
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masked ^= 1ULL << n;
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++m;
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}
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if (platform != NULL)
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{
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temp[m].str = platform;
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temp[m].len = platform_len;
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++m;
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}
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temp[m].str = "tls";
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temp[m].len = 3;
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++m;
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assert (m == cnt);
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/* Determine the total size of all strings together. */
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if (cnt == 1)
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total = temp[0].len + 1;
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else
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{
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total = temp[0].len + temp[cnt - 1].len + 2;
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if (cnt > 2)
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{
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total <<= 1;
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for (n = 1; n + 1 < cnt; ++n)
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total += temp[n].len + 1;
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if (cnt > 3
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&& (cnt >= sizeof (size_t) * 8
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|| total + (sizeof (*result) << 3)
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>= (1UL << (sizeof (size_t) * 8 - cnt + 3))))
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_dl_signal_error (ENOMEM, NULL, NULL,
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N_("cannot create capability list"));
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total <<= cnt - 3;
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}
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}
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/* The result structure: we use a very compressed way to store the
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various combinations of capability names. */
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*sz = 1 << cnt;
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result = (struct r_strlenpair *) malloc (*sz * sizeof (*result) + total);
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if (result == NULL)
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_dl_signal_error (ENOMEM, NULL, NULL,
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N_("cannot create capability list"));
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if (cnt == 1)
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{
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result[0].str = (char *) (result + *sz);
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result[0].len = temp[0].len + 1;
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result[1].str = (char *) (result + *sz);
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result[1].len = 0;
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cp = __mempcpy ((char *) (result + *sz), temp[0].str, temp[0].len);
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*cp = '/';
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*sz = 2;
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*max_capstrlen = result[0].len;
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return result;
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}
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/* Fill in the information. This follows the following scheme
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(indeces from TEMP for four strings):
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entry #0: 0, 1, 2, 3 binary: 1111
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#1: 0, 1, 3 1101
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#2: 0, 2, 3 1011
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#3: 0, 3 1001
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This allows the representation of all possible combinations of
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capability names in the string. First generate the strings. */
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result[1].str = result[0].str = cp = (char *) (result + *sz);
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#define add(idx) \
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cp = __mempcpy (__mempcpy (cp, temp[idx].str, temp[idx].len), "/", 1);
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if (cnt == 2)
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{
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add (1);
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add (0);
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}
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else
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{
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n = 1 << (cnt - 1);
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do
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{
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n -= 2;
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/* We always add the last string. */
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add (cnt - 1);
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/* Add the strings which have the bit set in N. */
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for (m = cnt - 2; m > 0; --m)
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if ((n & (1 << m)) != 0)
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add (m);
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/* Always add the first string. */
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add (0);
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}
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while (n != 0);
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}
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#undef add
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/* Now we are ready to install the string pointers and length. */
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for (n = 0; n < (1UL << cnt); ++n)
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result[n].len = 0;
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n = cnt;
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do
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{
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size_t mask = 1 << --n;
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rp = result;
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for (m = 1 << cnt; m > 0; ++rp)
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if ((--m & mask) != 0)
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rp->len += temp[n].len + 1;
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}
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while (n != 0);
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/* The first half of the strings all include the first string. */
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n = (1 << cnt) - 2;
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rp = &result[2];
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while (n != (1UL << (cnt - 1)))
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{
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if ((--n & 1) != 0)
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rp[0].str = rp[-2].str + rp[-2].len;
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else
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rp[0].str = rp[-1].str;
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++rp;
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}
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/* The second half starts right after the first part of the string of
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the corresponding entry in the first half. */
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do
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{
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rp[0].str = rp[-(1 << (cnt - 1))].str + temp[cnt - 1].len + 1;
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++rp;
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}
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while (--n != 0);
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/* The maximum string length. */
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*max_capstrlen = result[0].len;
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return result;
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}
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@ -335,23 +335,6 @@ _dl_non_dynamic_init (void)
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}
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}
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const struct r_strlenpair *
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internal_function
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_dl_important_hwcaps (const char *platform, size_t platform_len, size_t *sz,
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size_t *max_capstrlen)
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{
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static struct r_strlenpair result;
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static char buf[1];
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result.str = buf; /* Does not really matter. */
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result.len = 0;
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*sz = 1;
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return &result;
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}
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#ifdef DL_SYSINFO_IMPLEMENTATION
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DL_SYSINFO_IMPLEMENTATION
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#endif
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254
elf/dl-sysdep.c
254
elf/dl-sysdep.c
@ -44,12 +44,6 @@
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#include <hp-timing.h>
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#include <tls.h>
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#ifdef _DL_FIRST_PLATFORM
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# define _DL_FIRST_EXTRA (_DL_FIRST_PLATFORM + _DL_PLATFORMS_COUNT)
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#else
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# define _DL_FIRST_EXTRA _DL_HWCAP_COUNT
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#endif
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extern char **_environ attribute_hidden;
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extern char _end[] attribute_hidden;
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@ -350,252 +344,4 @@ _dl_show_auxv (void)
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}
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}
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/* Return an array of useful/necessary hardware capability names. */
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const struct r_strlenpair *
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internal_function
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_dl_important_hwcaps (const char *platform, size_t platform_len, size_t *sz,
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size_t *max_capstrlen)
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{
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/* Determine how many important bits are set. */
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uint64_t masked = GLRO(dl_hwcap) & GLRO(dl_hwcap_mask);
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size_t cnt = platform != NULL;
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size_t n, m;
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size_t total;
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struct r_strlenpair *temp;
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struct r_strlenpair *result;
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struct r_strlenpair *rp;
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char *cp;
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/* Count the number of bits set in the masked value. */
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for (n = 0; (~((1ULL << n) - 1) & masked) != 0; ++n)
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if ((masked & (1ULL << n)) != 0)
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++cnt;
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#if (defined NEED_DL_SYSINFO || defined NEED_DL_SYSINFO_DSO) && defined SHARED
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/* The system-supplied DSO can contain a note of type 2, vendor "GNU".
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This gives us a list of names to treat as fake hwcap bits. */
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const char *dsocaps = NULL;
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size_t dsocapslen = 0;
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if (GLRO(dl_sysinfo_map) != NULL)
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{
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const ElfW(Phdr) *const phdr = GLRO(dl_sysinfo_map)->l_phdr;
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const ElfW(Word) phnum = GLRO(dl_sysinfo_map)->l_phnum;
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for (uint_fast16_t i = 0; i < phnum; ++i)
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if (phdr[i].p_type == PT_NOTE)
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{
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const ElfW(Addr) start = (phdr[i].p_vaddr
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+ GLRO(dl_sysinfo_map)->l_addr);
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const struct
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{
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ElfW(Word) vendorlen;
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ElfW(Word) datalen;
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ElfW(Word) type;
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} *note = (const void *) start;
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while ((ElfW(Addr)) (note + 1) - start < phdr[i].p_memsz)
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{
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#define ROUND(len) (((len) + sizeof (ElfW(Word)) - 1) & -sizeof (ElfW(Word)))
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if (note->type == NT_GNU_HWCAP
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&& note->vendorlen == sizeof "GNU"
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&& !memcmp ((note + 1), "GNU", sizeof "GNU")
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&& note->datalen > 2 * sizeof (ElfW(Word)) + 2)
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{
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const ElfW(Word) *p = ((const void *) (note + 1)
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+ ROUND (sizeof "GNU"));
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cnt += *p++;
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++p; /* Skip mask word. */
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dsocaps = (const char *) p;
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dsocapslen = note->datalen - sizeof *p * 2;
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break;
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}
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note = ((const void *) (note + 1)
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+ ROUND (note->vendorlen) + ROUND (note->datalen));
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#undef ROUND
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}
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if (dsocaps != NULL)
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break;
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}
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}
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#endif
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/* For TLS enabled builds always add 'tls'. */
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++cnt;
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/* Create temporary data structure to generate result table. */
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temp = (struct r_strlenpair *) alloca (cnt * sizeof (*temp));
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m = 0;
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#if (defined NEED_DL_SYSINFO || defined NEED_DL_SYSINFO_DSO) && defined SHARED
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if (dsocaps != NULL)
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{
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const ElfW(Word) mask = ((const ElfW(Word) *) dsocaps)[-1];
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GLRO(dl_hwcap) |= (uint64_t) mask << _DL_FIRST_EXTRA;
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/* Note that we add the dsocaps to the set already chosen by the
|
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LD_HWCAP_MASK environment variable (or default HWCAP_IMPORTANT).
|
||||
So there is no way to request ignoring an OS-supplied dsocap
|
||||
string and bit like you can ignore an OS-supplied HWCAP bit. */
|
||||
GLRO(dl_hwcap_mask) |= (uint64_t) mask << _DL_FIRST_EXTRA;
|
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size_t len;
|
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for (const char *p = dsocaps; p < dsocaps + dsocapslen; p += len + 1)
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{
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uint_fast8_t bit = *p++;
|
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len = strlen (p);
|
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|
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/* Skip entries that are not enabled in the mask word. */
|
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if (__builtin_expect (mask & ((ElfW(Word)) 1 << bit), 1))
|
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{
|
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temp[m].str = p;
|
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temp[m].len = len;
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++m;
|
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}
|
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else
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--cnt;
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}
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}
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#endif
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for (n = 0; masked != 0; ++n)
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if ((masked & (1ULL << n)) != 0)
|
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{
|
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temp[m].str = _dl_hwcap_string (n);
|
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temp[m].len = strlen (temp[m].str);
|
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masked ^= 1ULL << n;
|
||||
++m;
|
||||
}
|
||||
if (platform != NULL)
|
||||
{
|
||||
temp[m].str = platform;
|
||||
temp[m].len = platform_len;
|
||||
++m;
|
||||
}
|
||||
|
||||
temp[m].str = "tls";
|
||||
temp[m].len = 3;
|
||||
++m;
|
||||
|
||||
assert (m == cnt);
|
||||
|
||||
/* Determine the total size of all strings together. */
|
||||
if (cnt == 1)
|
||||
total = temp[0].len + 1;
|
||||
else
|
||||
{
|
||||
total = temp[0].len + temp[cnt - 1].len + 2;
|
||||
if (cnt > 2)
|
||||
{
|
||||
total <<= 1;
|
||||
for (n = 1; n + 1 < cnt; ++n)
|
||||
total += temp[n].len + 1;
|
||||
if (cnt > 3
|
||||
&& (cnt >= sizeof (size_t) * 8
|
||||
|| total + (sizeof (*result) << 3)
|
||||
>= (1UL << (sizeof (size_t) * 8 - cnt + 3))))
|
||||
_dl_signal_error (ENOMEM, NULL, NULL,
|
||||
N_("cannot create capability list"));
|
||||
|
||||
total <<= cnt - 3;
|
||||
}
|
||||
}
|
||||
|
||||
/* The result structure: we use a very compressed way to store the
|
||||
various combinations of capability names. */
|
||||
*sz = 1 << cnt;
|
||||
result = (struct r_strlenpair *) malloc (*sz * sizeof (*result) + total);
|
||||
if (result == NULL)
|
||||
_dl_signal_error (ENOMEM, NULL, NULL,
|
||||
N_("cannot create capability list"));
|
||||
|
||||
if (cnt == 1)
|
||||
{
|
||||
result[0].str = (char *) (result + *sz);
|
||||
result[0].len = temp[0].len + 1;
|
||||
result[1].str = (char *) (result + *sz);
|
||||
result[1].len = 0;
|
||||
cp = __mempcpy ((char *) (result + *sz), temp[0].str, temp[0].len);
|
||||
*cp = '/';
|
||||
*sz = 2;
|
||||
*max_capstrlen = result[0].len;
|
||||
|
||||
return result;
|
||||
}
|
||||
|
||||
/* Fill in the information. This follows the following scheme
|
||||
(indeces from TEMP for four strings):
|
||||
entry #0: 0, 1, 2, 3 binary: 1111
|
||||
#1: 0, 1, 3 1101
|
||||
#2: 0, 2, 3 1011
|
||||
#3: 0, 3 1001
|
||||
This allows the representation of all possible combinations of
|
||||
capability names in the string. First generate the strings. */
|
||||
result[1].str = result[0].str = cp = (char *) (result + *sz);
|
||||
#define add(idx) \
|
||||
cp = __mempcpy (__mempcpy (cp, temp[idx].str, temp[idx].len), "/", 1);
|
||||
if (cnt == 2)
|
||||
{
|
||||
add (1);
|
||||
add (0);
|
||||
}
|
||||
else
|
||||
{
|
||||
n = 1 << (cnt - 1);
|
||||
do
|
||||
{
|
||||
n -= 2;
|
||||
|
||||
/* We always add the last string. */
|
||||
add (cnt - 1);
|
||||
|
||||
/* Add the strings which have the bit set in N. */
|
||||
for (m = cnt - 2; m > 0; --m)
|
||||
if ((n & (1 << m)) != 0)
|
||||
add (m);
|
||||
|
||||
/* Always add the first string. */
|
||||
add (0);
|
||||
}
|
||||
while (n != 0);
|
||||
}
|
||||
#undef add
|
||||
|
||||
/* Now we are ready to install the string pointers and length. */
|
||||
for (n = 0; n < (1UL << cnt); ++n)
|
||||
result[n].len = 0;
|
||||
n = cnt;
|
||||
do
|
||||
{
|
||||
size_t mask = 1 << --n;
|
||||
|
||||
rp = result;
|
||||
for (m = 1 << cnt; m > 0; ++rp)
|
||||
if ((--m & mask) != 0)
|
||||
rp->len += temp[n].len + 1;
|
||||
}
|
||||
while (n != 0);
|
||||
|
||||
/* The first half of the strings all include the first string. */
|
||||
n = (1 << cnt) - 2;
|
||||
rp = &result[2];
|
||||
while (n != (1UL << (cnt - 1)))
|
||||
{
|
||||
if ((--n & 1) != 0)
|
||||
rp[0].str = rp[-2].str + rp[-2].len;
|
||||
else
|
||||
rp[0].str = rp[-1].str;
|
||||
++rp;
|
||||
}
|
||||
|
||||
/* The second half starts right after the first part of the string of
|
||||
the corresponding entry in the first half. */
|
||||
do
|
||||
{
|
||||
rp[0].str = rp[-(1 << (cnt - 1))].str + temp[cnt - 1].len + 1;
|
||||
++rp;
|
||||
}
|
||||
while (--n != 0);
|
||||
|
||||
/* The maximum string length. */
|
||||
*max_capstrlen = result[0].len;
|
||||
|
||||
return result;
|
||||
}
|
||||
|
||||
#endif
|
||||
|
||||
@ -646,26 +646,6 @@ _dl_show_auxv (void)
|
||||
}
|
||||
|
||||
|
||||
/* Return an array of useful/necessary hardware capability names. */
|
||||
const struct r_strlenpair *
|
||||
internal_function
|
||||
_dl_important_hwcaps (const char *platform, size_t platform_len, size_t *sz,
|
||||
size_t *max_capstrlen)
|
||||
{
|
||||
struct r_strlenpair *result;
|
||||
|
||||
/* Return an empty array. Hurd has no hardware capabilities. */
|
||||
result = (struct r_strlenpair *) malloc (sizeof (*result));
|
||||
if (result == NULL)
|
||||
_dl_signal_error (ENOMEM, NULL, NULL, "cannot create capability list");
|
||||
|
||||
result[0].str = (char *) result; /* Does not really matter. */
|
||||
result[0].len = 0;
|
||||
|
||||
*sz = 1;
|
||||
return result;
|
||||
}
|
||||
|
||||
void weak_function
|
||||
_dl_init_first (int argc, ...)
|
||||
{
|
||||
|
||||
Loading…
Reference in New Issue
Block a user