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The test now takes the callgraph into account. Only code called
during runtime relocation is affected by the limitation. We now
determine the affected object files as closely as possible from
the outside. This allowed to remove some the specializations
for some of the string functions as they are only used in other
code paths.
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This patch introduces a test to make sure no function modifies the
xmm/ymm registers. With the exception of the auditing functions.
The test is probably too pessimistic. All code linked into ld.so
is checked. Perhaps at some point the callgraph starting from
_dl_fixup and _dl_profile_fixup is checked and we can start using
faster SSE-using functions in parts of ld.so.
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The file contained some code which was never used. Don't compile it
in.
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When multiarch is enabled we have this information stored. Use it.
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The most recent AP 485 describes a few more cache descriptors for
L3 caches with 24-way associativity.
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There will be more than one function which, in multiarch mode, wants
to use SSSE3. We should not test in each of them for Atoms with
slow SSSE3. Instead, disable the SSSE3 bit in the startup code for
such machines.
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This patch implements SSE4.2 strstr/strcasestr, using Knuth-Morris-Pratt
string searching algorithm.
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The patch mainly reduces the code size but also avoids some jumps.
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Don't use AVX instructions too often.
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The original AVX patch used a function pointer to handle the difference
between machines with and without AVX support. This is insecure. A
well-placed memory exploit could lead to redirection of the execution.
Using a variable and several tests is a bit slower but cannot be
exploited in this way.
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Some of the new multi-arch string functions for x86-64 were
not aligned to 16 byte boundarie,s possibly creating unnecessary
cache line misses and delays.
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This patch adds SSSE3 strcpy/stpcpy. I got up to 4X speed up on Core 2
and Core i7. I disabled it on Atom since SSSE3 version is slower for
shorter (<64byte) data.
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gcc 4.4 is more picky. And the x86-64 version of <bits/select.h>
contained a now unnecessary asm optimization. Remove it.
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The SSE4.2 implementation is used in the DSO only. The patch also adds
some infrastructure to be used in similar code later one.
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I didn't remove an instruction from a previous version in the final
version.
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The test to call the indirect function now includes a subtest to
checked whether the symbol is defined. When coming to that point
this is almost always the case. The test for STT_GNU_IFUNC on the
other hand rarely is true. Move it to the front means we don't have
to perform the second test unless really necessary.
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Now that static executables can handle IFUNC functions don't exclude
optimization for sched_cpucount for !SHARED.
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Add support for the IRELAIVE relocation and IFUNC in static executables.
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SO far Intel and AMD use exactly the same bits meaning the same
things in CPUID index 1. Simplify the code. Should an architecture
come along which doesn't use the same semantics then it must use a
different index value than COMMON_CPUID_INDEX_1.
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This saves about 1.5kB in the DSO.
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The ____longjmp_chk functions on x86 and x86-64 were placed in .rodata.str1.1.
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If longjmp restores the stack frame to an address which is beyond
the stack frame at the time of the longjmp call it would install
an uninitialized stack frame. If compiled with _FORTIFY_SOURCE
defined, longjmp will now bail out in this situation.
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* nss/getXXbyYY_r.c: If NO_COMPAT_NEEDED is defined don't define any
compatibility functions.
* nss/getXXent_r.c: Likewise.
* gshadow/getsgent_r.c: Define NO_COMPAT_NEEDED.
* gshadow/getsgnam_r.c: Likewise.
* gshadow/Version: Remove duplicate entries.
* sysdeps/x86_64/cacheinfo.c (intel_02_cache_info): Add missing entries
for recent processor.
* sysdeps/unix/sysv/linux/i386/sysconf.c (intel_02_cache_info):
Likewise.
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count is zero.
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* sysdeps/ieee754/flt-32/s_expm1f.c: Likewise.
* sysdeps/x86_64/fpu/s_expm1l.S: Likewise.
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from definition.
* sysdeps/x86_64/dl-machine.h (elf_machine_rela): Don't define
label if it is not used.
* elf/dl-profile.c (_dl_start_profile): Define real-type variant
of gmon_hist_hdr and gmon_hdr structures and use them.
* elf/dl-load.c (open_verify): Add temporary variable to avoid
warning.
* nscd/nscd_helper.c (get_mapping): Avoid casts to avoid warnings.
* sunrpc/clnt_raw.c (clntraw_private_s): Use union in definition
to avoid cast.
* inet/rexec.c (rexec_af): Make sa2 a union to avoid warnings.
* inet/rcmd.c (rcmd_af): Make from a union of the various needed types
to avoid warnings.
(iruserok_af): Use ss_family instead of casts.
* gmon/gmon.c (write_hist): Define real-type variant of
gmon_hist_hdr structure and use it.
(write_gmon): Likewise for gmon_hdr.
* sysdeps/unix/sysv/linux/readv.c: Avoid declaration of replacement
function if we are not going to define it.
* sysdeps/unix/sysv/linux/writev.c: Likewise.
* inet/inet6_option.c (optin_alloc): Add temporary variable to
avoid warning.
* libio/strfile.h (struct _IO_streambuf): Use correct type and
name of VTable element.
* libio/iovsprintf.c: Avoid casts to avoid warnings.
* libio/iovsscanf.c: Likewise.
* libio/vasprintf.c: Likewise.
* libio/vsnprintf.c: Likewise.
* stdio-common/isoc99_vsscanf.c: Likewise.
* stdlib/strfmon_l.c: Likewise.
* debug/vasprintf_chk.c: Likewise.
* debug/vsnprintf_chk.c: Likewise.
* debug/vsprintf_chk.c: Likewise.
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