601650f878
* Tue May 31 2022 Arjun Shankar <arjun@redhat.com> - 2.34-35 - Sync with upstream branch release/2.34/master, commit ff450cdbdee0b8cb6b9d653d6d2fa892de29be31: - Fix deadlock when pthread_atfork handler calls pthread_atfork or dlclose - x86: Fallback {str|wcs}cmp RTM in the ncmp overflow case [BZ #29127] - string.h: fix __fortified_attr_access macro call [BZ #29162] - linux: Add a getauxval test [BZ #23293] - rtld: Use generic argv adjustment in ld.so [BZ #23293] - S390: Enable static PIE * Thu May 19 2022 Florian Weimer <fweimer@redhat.com> - 2.34-34 - Sync with upstream branch release/2.34/master, commit ede8d94d154157d269b18f3601440ac576c1f96a: - csu: Implement and use _dl_early_allocate during static startup - Linux: Introduce __brk_call for invoking the brk system call - Linux: Implement a useful version of _startup_fatal - ia64: Always define IA64_USE_NEW_STUB as a flag macro - Linux: Define MMAP_CALL_INTERNAL - i386: Honor I386_USE_SYSENTER for 6-argument Linux system calls - i386: Remove OPTIMIZE_FOR_GCC_5 from Linux libc-do-syscall.S - elf: Remove __libc_init_secure - Linux: Consolidate auxiliary vector parsing (redo) - Linux: Include <dl-auxv.h> in dl-sysdep.c only for SHARED - Revert "Linux: Consolidate auxiliary vector parsing" - Linux: Consolidate auxiliary vector parsing - Linux: Assume that NEED_DL_SYSINFO_DSO is always defined - Linux: Remove DL_FIND_ARG_COMPONENTS - Linux: Remove HAVE_AUX_SECURE, HAVE_AUX_XID, HAVE_AUX_PAGESIZE - elf: Merge dl-sysdep.c into the Linux version - elf: Remove unused NEED_DL_BASE_ADDR and _dl_base_addr - x86: Optimize {str|wcs}rchr-evex - x86: Optimize {str|wcs}rchr-avx2 - x86: Optimize {str|wcs}rchr-sse2 - x86: Cleanup page cross code in memcmp-avx2-movbe.S - x86: Remove memcmp-sse4.S - x86: Small improvements for wcslen - x86: Remove AVX str{n}casecmp - x86: Add EVEX optimized str{n}casecmp - x86: Add AVX2 optimized str{n}casecmp - x86: Optimize str{n}casecmp TOLOWER logic in strcmp-sse42.S - x86: Optimize str{n}casecmp TOLOWER logic in strcmp.S - x86: Remove strspn-sse2.S and use the generic implementation - x86: Remove strpbrk-sse2.S and use the generic implementation - x87: Remove strcspn-sse2.S and use the generic implementation - x86: Optimize strspn in strspn-c.c - x86: Optimize strcspn and strpbrk in strcspn-c.c - x86: Code cleanup in strchr-evex and comment justifying branch - x86: Code cleanup in strchr-avx2 and comment justifying branch - x86_64: Remove bcopy optimizations - x86-64: Remove bzero weak alias in SS2 memset - x86_64/multiarch: Sort sysdep_routines and put one entry per line - x86: Improve L to support L(XXX_SYMBOL (YYY, ZZZ)) - fortify: Ensure that __glibc_fortify condition is a constant [BZ #29141] * Thu May 12 2022 Florian Weimer <fweimer@redhat.com> - 2.34-33 - Sync with upstream branch release/2.34/master, commit 91c2e6c3db44297bf4cb3a2e3c40236c5b6a0b23: - dlfcn: Implement the RTLD_DI_PHDR request type for dlinfo - manual: Document the dlinfo function - x86: Fix fallback for wcsncmp_avx2 in strcmp-avx2.S [BZ #28896] - x86: Fix bug in strncmp-evex and strncmp-avx2 [BZ #28895] - x86: Set .text section in memset-vec-unaligned-erms - x86-64: Optimize bzero - x86: Remove SSSE3 instruction for broadcast in memset.S (SSE2 Only) - x86: Improve vec generation in memset-vec-unaligned-erms.S - x86-64: Fix strcmp-evex.S - x86-64: Fix strcmp-avx2.S - x86: Optimize strcmp-evex.S - x86: Optimize strcmp-avx2.S - manual: Clarify that abbreviations of long options are allowed - Add HWCAP2_AFP, HWCAP2_RPRES from Linux 5.17 to AArch64 bits/hwcap.h - aarch64: Add HWCAP2_ECV from Linux 5.16 - Add SOL_MPTCP, SOL_MCTP from Linux 5.16 to bits/socket.h - Update kernel version to 5.17 in tst-mman-consts.py - Update kernel version to 5.16 in tst-mman-consts.py - Update syscall lists for Linux 5.17 - Add ARPHRD_CAN, ARPHRD_MCTP to net/if_arp.h - Update kernel version to 5.15 in tst-mman-consts.py - Add PF_MCTP, AF_MCTP from Linux 5.15 to bits/socket.h Resolves: #2091541
411 lines
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411 lines
12 KiB
Diff
commit 4b9cd5465d5158dad7b4f0762bc70a3a1209b481
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Author: Florian Weimer <fweimer@redhat.com>
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Date: Thu Feb 3 10:58:59 2022 +0100
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Linux: Consolidate auxiliary vector parsing
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And optimize it slightly.
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The large switch statement in _dl_sysdep_start can be replaced with
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a large array. This reduces source code and binary size. On
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i686-linux-gnu:
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Before:
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text data bss dec hex filename
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7791 12 0 7803 1e7b elf/dl-sysdep.os
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After:
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text data bss dec hex filename
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7135 12 0 7147 1beb elf/dl-sysdep.os
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Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
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(cherry picked from commit 8c8510ab2790039e58995ef3a22309582413d3ff)
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diff --git a/elf/dl-support.c b/elf/dl-support.c
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index f29dc965f4d10648..40ef07521336857d 100644
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--- a/elf/dl-support.c
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+++ b/elf/dl-support.c
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@@ -241,93 +241,21 @@ __rtld_lock_define_initialized_recursive (, _dl_load_tls_lock)
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#ifdef HAVE_AUX_VECTOR
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+#include <dl-parse_auxv.h>
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+
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int _dl_clktck;
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void
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_dl_aux_init (ElfW(auxv_t) *av)
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{
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- int seen = 0;
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- uid_t uid = 0;
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- gid_t gid = 0;
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-
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#ifdef NEED_DL_SYSINFO
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/* NB: Avoid RELATIVE relocation in static PIE. */
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GL(dl_sysinfo) = DL_SYSINFO_DEFAULT;
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#endif
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_dl_auxv = av;
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- for (; av->a_type != AT_NULL; ++av)
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- switch (av->a_type)
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- {
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- case AT_PAGESZ:
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- if (av->a_un.a_val != 0)
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- GLRO(dl_pagesize) = av->a_un.a_val;
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- break;
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- case AT_CLKTCK:
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- GLRO(dl_clktck) = av->a_un.a_val;
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- break;
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- case AT_PHDR:
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- GL(dl_phdr) = (const void *) av->a_un.a_val;
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- break;
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- case AT_PHNUM:
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- GL(dl_phnum) = av->a_un.a_val;
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- break;
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- case AT_PLATFORM:
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- GLRO(dl_platform) = (void *) av->a_un.a_val;
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- break;
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- case AT_HWCAP:
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- GLRO(dl_hwcap) = (unsigned long int) av->a_un.a_val;
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- break;
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- case AT_HWCAP2:
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- GLRO(dl_hwcap2) = (unsigned long int) av->a_un.a_val;
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- break;
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- case AT_FPUCW:
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- GLRO(dl_fpu_control) = av->a_un.a_val;
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- break;
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-#ifdef NEED_DL_SYSINFO
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- case AT_SYSINFO:
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- GL(dl_sysinfo) = av->a_un.a_val;
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- break;
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-#endif
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-#ifdef NEED_DL_SYSINFO_DSO
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- case AT_SYSINFO_EHDR:
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- GL(dl_sysinfo_dso) = (void *) av->a_un.a_val;
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- break;
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-#endif
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- case AT_UID:
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- uid ^= av->a_un.a_val;
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- seen |= 1;
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- break;
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- case AT_EUID:
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- uid ^= av->a_un.a_val;
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- seen |= 2;
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- break;
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- case AT_GID:
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- gid ^= av->a_un.a_val;
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- seen |= 4;
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- break;
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- case AT_EGID:
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- gid ^= av->a_un.a_val;
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- seen |= 8;
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- break;
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- case AT_SECURE:
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- seen = -1;
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- __libc_enable_secure = av->a_un.a_val;
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- __libc_enable_secure_decided = 1;
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- break;
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- case AT_RANDOM:
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- _dl_random = (void *) av->a_un.a_val;
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- break;
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- case AT_MINSIGSTKSZ:
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- _dl_minsigstacksize = av->a_un.a_val;
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- break;
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- DL_PLATFORM_AUXV
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- }
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- if (seen == 0xf)
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- {
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- __libc_enable_secure = uid != 0 || gid != 0;
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- __libc_enable_secure_decided = 1;
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- }
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+ dl_parse_auxv_t auxv_values = { 0, };
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+ _dl_parse_auxv (av, auxv_values);
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}
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#endif
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diff --git a/sysdeps/unix/sysv/linux/alpha/dl-auxv.h b/sysdeps/unix/sysv/linux/alpha/dl-auxv.h
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index 1aa9dca80d189ebe..8c99e776a0af9cef 100644
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--- a/sysdeps/unix/sysv/linux/alpha/dl-auxv.h
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+++ b/sysdeps/unix/sysv/linux/alpha/dl-auxv.h
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@@ -20,16 +20,8 @@
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extern long __libc_alpha_cache_shape[4];
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-#define DL_PLATFORM_AUXV \
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- case AT_L1I_CACHESHAPE: \
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- __libc_alpha_cache_shape[0] = av->a_un.a_val; \
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- break; \
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- case AT_L1D_CACHESHAPE: \
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- __libc_alpha_cache_shape[1] = av->a_un.a_val; \
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- break; \
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- case AT_L2_CACHESHAPE: \
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- __libc_alpha_cache_shape[2] = av->a_un.a_val; \
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- break; \
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- case AT_L3_CACHESHAPE: \
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- __libc_alpha_cache_shape[3] = av->a_un.a_val; \
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- break;
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+#define DL_PLATFORM_AUXV \
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+ __libc_alpha_cache_shape[0] = auxv_values[AT_L1I_CACHESHAPE]; \
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+ __libc_alpha_cache_shape[1] = auxv_values[AT_L1D_CACHESHAPE]; \
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+ __libc_alpha_cache_shape[2] = auxv_values[AT_L2_CACHESHAPE]; \
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+ __libc_alpha_cache_shape[3] = auxv_values[AT_L3_CACHESHAPE];
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diff --git a/sysdeps/unix/sysv/linux/dl-parse_auxv.h b/sysdeps/unix/sysv/linux/dl-parse_auxv.h
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new file mode 100644
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index 0000000000000000..b3d82f69946d6d2c
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--- /dev/null
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+++ b/sysdeps/unix/sysv/linux/dl-parse_auxv.h
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@@ -0,0 +1,61 @@
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+/* Parse the Linux auxiliary vector.
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+ Copyright (C) 1995-2022 Free Software Foundation, Inc.
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+ This file is part of the GNU C Library.
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+
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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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+
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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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+
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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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+ <https://www.gnu.org/licenses/>. */
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+
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+#include <elf.h>
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+#include <entry.h>
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+#include <fpu_control.h>
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+#include <ldsodefs.h>
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+#include <link.h>
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+
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+typedef ElfW(Addr) dl_parse_auxv_t[AT_MINSIGSTKSZ + 1];
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+
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+/* Copy the auxiliary vector into AUX_VALUES and set up GLRO
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+ variables. */
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+static inline
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+void _dl_parse_auxv (ElfW(auxv_t) *av, dl_parse_auxv_t auxv_values)
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+{
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+ auxv_values[AT_ENTRY] = (ElfW(Addr)) ENTRY_POINT;
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+ auxv_values[AT_PAGESZ] = EXEC_PAGESIZE;
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+ auxv_values[AT_FPUCW] = _FPU_DEFAULT;
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+
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+ /* NB: Default to a constant CONSTANT_MINSIGSTKSZ. */
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+ _Static_assert (__builtin_constant_p (CONSTANT_MINSIGSTKSZ),
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+ "CONSTANT_MINSIGSTKSZ is constant");
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+ auxv_values[AT_MINSIGSTKSZ] = CONSTANT_MINSIGSTKSZ;
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+
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+ for (; av->a_type != AT_NULL; av++)
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+ if (av->a_type <= AT_MINSIGSTKSZ)
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+ auxv_values[av->a_type] = av->a_un.a_val;
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+
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+ GLRO(dl_pagesize) = auxv_values[AT_PAGESZ];
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+ __libc_enable_secure = auxv_values[AT_SECURE];
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+ GLRO(dl_platform) = (void *) auxv_values[AT_PLATFORM];
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+ GLRO(dl_hwcap) = auxv_values[AT_HWCAP];
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+ GLRO(dl_hwcap2) = auxv_values[AT_HWCAP2];
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+ GLRO(dl_clktck) = auxv_values[AT_CLKTCK];
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+ GLRO(dl_fpu_control) = auxv_values[AT_FPUCW];
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+ _dl_random = (void *) auxv_values[AT_RANDOM];
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+ GLRO(dl_minsigstacksize) = auxv_values[AT_MINSIGSTKSZ];
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+ GLRO(dl_sysinfo_dso) = (void *) auxv_values[AT_SYSINFO_EHDR];
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+#ifdef NEED_DL_SYSINFO
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+ if (GLRO(dl_sysinfo_dso) != NULL)
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+ GLRO(dl_sysinfo) = auxv_values[AT_SYSINFO];
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+#endif
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+
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+ DL_PLATFORM_AUXV
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+}
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diff --git a/sysdeps/unix/sysv/linux/dl-sysdep.c b/sysdeps/unix/sysv/linux/dl-sysdep.c
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index 1829dab4f38b560c..80aa9f6f4acb7e3c 100644
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--- a/sysdeps/unix/sysv/linux/dl-sysdep.c
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+++ b/sysdeps/unix/sysv/linux/dl-sysdep.c
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@@ -21,13 +21,12 @@
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#include <dl-auxv.h>
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#include <dl-hwcap-check.h>
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#include <dl-osinfo.h>
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+#include <dl-parse_auxv.h>
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#include <dl-procinfo.h>
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#include <dl-tunables.h>
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#include <elf.h>
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-#include <entry.h>
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#include <errno.h>
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#include <fcntl.h>
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-#include <fpu_control.h>
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#include <ldsodefs.h>
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#include <libc-internal.h>
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#include <libintl.h>
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@@ -63,24 +62,24 @@ void *_dl_random attribute_relro = NULL;
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# define DL_STACK_END(cookie) ((void *) (cookie))
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#endif
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-ElfW(Addr)
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-_dl_sysdep_start (void **start_argptr,
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- void (*dl_main) (const ElfW(Phdr) *phdr, ElfW(Word) phnum,
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- ElfW(Addr) *user_entry, ElfW(auxv_t) *auxv))
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+/* Arguments passed to dl_main. */
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+struct dl_main_arguments
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{
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- const ElfW(Phdr) *phdr = NULL;
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- ElfW(Word) phnum = 0;
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+ const ElfW(Phdr) *phdr;
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+ ElfW(Word) phnum;
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ElfW(Addr) user_entry;
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- ElfW(auxv_t) *av;
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-#ifdef NEED_DL_SYSINFO
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- uintptr_t new_sysinfo = 0;
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-#endif
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+};
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- __libc_stack_end = DL_STACK_END (start_argptr);
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+/* Separate function, so that dl_main can be called without the large
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+ array on the stack. */
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+static void
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+_dl_sysdep_parse_arguments (void **start_argptr,
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+ struct dl_main_arguments *args)
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+{
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_dl_argc = (intptr_t) *start_argptr;
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_dl_argv = (char **) (start_argptr + 1); /* Necessary aliasing violation. */
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_environ = _dl_argv + _dl_argc + 1;
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- for (char **tmp = _environ + 1; ; ++tmp)
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+ for (char **tmp = _environ; ; ++tmp)
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if (*tmp == NULL)
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{
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/* Another necessary aliasing violation. */
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@@ -88,74 +87,25 @@ _dl_sysdep_start (void **start_argptr,
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break;
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}
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- user_entry = (ElfW(Addr)) ENTRY_POINT;
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- GLRO(dl_platform) = NULL; /* Default to nothing known about the platform. */
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+ dl_parse_auxv_t auxv_values = { 0, };
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+ _dl_parse_auxv (GLRO(dl_auxv), auxv_values);
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- /* NB: Default to a constant CONSTANT_MINSIGSTKSZ. */
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- _Static_assert (__builtin_constant_p (CONSTANT_MINSIGSTKSZ),
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- "CONSTANT_MINSIGSTKSZ is constant");
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- GLRO(dl_minsigstacksize) = CONSTANT_MINSIGSTKSZ;
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+ args->phdr = (const ElfW(Phdr) *) auxv_values[AT_PHDR];
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+ args->phnum = auxv_values[AT_PHNUM];
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+ args->user_entry = auxv_values[AT_ENTRY];
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+}
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- for (av = GLRO(dl_auxv); av->a_type != AT_NULL; av++)
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- switch (av->a_type)
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- {
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- case AT_PHDR:
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- phdr = (void *) av->a_un.a_val;
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- break;
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- case AT_PHNUM:
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- phnum = av->a_un.a_val;
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- break;
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- case AT_PAGESZ:
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- GLRO(dl_pagesize) = av->a_un.a_val;
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- break;
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- case AT_ENTRY:
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- user_entry = av->a_un.a_val;
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- break;
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- case AT_SECURE:
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- __libc_enable_secure = av->a_un.a_val;
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- break;
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- case AT_PLATFORM:
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- GLRO(dl_platform) = (void *) av->a_un.a_val;
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- break;
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- case AT_HWCAP:
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- GLRO(dl_hwcap) = (unsigned long int) av->a_un.a_val;
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- break;
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- case AT_HWCAP2:
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- GLRO(dl_hwcap2) = (unsigned long int) av->a_un.a_val;
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- break;
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- case AT_CLKTCK:
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- GLRO(dl_clktck) = av->a_un.a_val;
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- break;
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- case AT_FPUCW:
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- GLRO(dl_fpu_control) = av->a_un.a_val;
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- break;
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-#ifdef NEED_DL_SYSINFO
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- case AT_SYSINFO:
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- new_sysinfo = av->a_un.a_val;
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- break;
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-#endif
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- case AT_SYSINFO_EHDR:
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- GLRO(dl_sysinfo_dso) = (void *) av->a_un.a_val;
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- break;
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- case AT_RANDOM:
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- _dl_random = (void *) av->a_un.a_val;
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- break;
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- case AT_MINSIGSTKSZ:
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- GLRO(dl_minsigstacksize) = av->a_un.a_val;
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- break;
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- DL_PLATFORM_AUXV
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- }
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+ElfW(Addr)
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+_dl_sysdep_start (void **start_argptr,
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+ void (*dl_main) (const ElfW(Phdr) *phdr, ElfW(Word) phnum,
|
|
+ ElfW(Addr) *user_entry, ElfW(auxv_t) *auxv))
|
|
+{
|
|
+ __libc_stack_end = DL_STACK_END (start_argptr);
|
|
|
|
- dl_hwcap_check ();
|
|
+ struct dl_main_arguments dl_main_args;
|
|
+ _dl_sysdep_parse_arguments (start_argptr, &dl_main_args);
|
|
|
|
-#ifdef NEED_DL_SYSINFO
|
|
- if (new_sysinfo != 0)
|
|
- {
|
|
- /* Only set the sysinfo value if we also have the vsyscall DSO. */
|
|
- if (GLRO(dl_sysinfo_dso) != 0)
|
|
- GLRO(dl_sysinfo) = new_sysinfo;
|
|
- }
|
|
-#endif
|
|
+ dl_hwcap_check ();
|
|
|
|
__tunables_init (_environ);
|
|
|
|
@@ -187,8 +137,9 @@ _dl_sysdep_start (void **start_argptr,
|
|
if (__builtin_expect (__libc_enable_secure, 0))
|
|
__libc_check_standard_fds ();
|
|
|
|
- (*dl_main) (phdr, phnum, &user_entry, GLRO(dl_auxv));
|
|
- return user_entry;
|
|
+ (*dl_main) (dl_main_args.phdr, dl_main_args.phnum,
|
|
+ &dl_main_args.user_entry, GLRO(dl_auxv));
|
|
+ return dl_main_args.user_entry;
|
|
}
|
|
|
|
void
|
|
diff --git a/sysdeps/unix/sysv/linux/powerpc/dl-auxv.h b/sysdeps/unix/sysv/linux/powerpc/dl-auxv.h
|
|
index 36ba0f3e9e45f3e2..7f35fb531ba22098 100644
|
|
--- a/sysdeps/unix/sysv/linux/powerpc/dl-auxv.h
|
|
+++ b/sysdeps/unix/sysv/linux/powerpc/dl-auxv.h
|
|
@@ -16,15 +16,5 @@
|
|
License along with the GNU C Library; if not, see
|
|
<https://www.gnu.org/licenses/>. */
|
|
|
|
-#include <ldsodefs.h>
|
|
-
|
|
-#if IS_IN (libc) && !defined SHARED
|
|
-int GLRO(dl_cache_line_size);
|
|
-#endif
|
|
-
|
|
-/* Scan the Aux Vector for the "Data Cache Block Size" entry and assign it
|
|
- to dl_cache_line_size. */
|
|
-#define DL_PLATFORM_AUXV \
|
|
- case AT_DCACHEBSIZE: \
|
|
- GLRO(dl_cache_line_size) = av->a_un.a_val; \
|
|
- break;
|
|
+#define DL_PLATFORM_AUXV \
|
|
+ GLRO(dl_cache_line_size) = auxv_values[AT_DCACHEBSIZE];
|
|
diff --git a/sysdeps/unix/sysv/linux/powerpc/dl-support.c b/sysdeps/unix/sysv/linux/powerpc/dl-support.c
|
|
new file mode 100644
|
|
index 0000000000000000..abe68a704946b90f
|
|
--- /dev/null
|
|
+++ b/sysdeps/unix/sysv/linux/powerpc/dl-support.c
|
|
@@ -0,0 +1,4 @@
|
|
+#include <elf/dl-support.c>
|
|
+
|
|
+/* Populated from the auxiliary vector. */
|
|
+int _dl_cache_line_size;
|