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| author | H.J. Lu <hjl.tools@gmail.com> | 2018-02-27 11:34:20 -0800 |
|---|---|---|
| committer | H.J. Lu <hjl.tools@gmail.com> | 2018-02-27 11:34:29 -0800 |
| commit | f6aec96dce1ddbd8961a3aa8a2925db2021719bb (patch) | |
| tree | 0837083a3f8011754f0fa415afa4a6fb27795580 /ld/configure.ac | |
| parent | 55089490f79ce1ddb9610fd6abeeaf896825fb71 (diff) | |
| download | gdb-f6aec96dce1ddbd8961a3aa8a2925db2021719bb.zip gdb-f6aec96dce1ddbd8961a3aa8a2925db2021719bb.tar.gz gdb-f6aec96dce1ddbd8961a3aa8a2925db2021719bb.tar.bz2 | |
ld: Add --enable-separate-code
This patch adds --enable-separate-code to ld configure to turn on
-z separate-code by default and enables it by default for Linux/x86.
This avoids mixing code pages with data to improve cache performance
as well as security.
To reduce x86-64 executable and shared object sizes, the maximum page
size is reduced from 2MB to 4KB when -z separate-code is turned on by
default. Note: -z max-page-size= can be used to set the maximum page
size.
We compared SPEC CPU 2017 performance before and after this change on
Skylake server. There are no any significant performance changes.
Everything is mostly below +/-1%.
bfd/
* config.in: Regenerated.
* configure: Likewise.
* configure.ac: Add --enable-separate-code.
(DEFAULT_LD_Z_SEPARATE_CODE): New AC_DEFINE_UNQUOTED. Default
to 1 for Linux/x86 targets,
* elf64-x86-64.c (ELF_MAXPAGESIZE): Set to 0x1000 if
DEFAULT_LD_Z_SEPARATE_CODE is 1.
ld/
* NEWS: Mention --enable-separate-code.
* configure.ac: Add --enable-separate-code.
(DEFAULT_LD_Z_SEPARATE_CODE): New AC_DEFINE_UNQUOTED.
* configure.tgt: Default ac_default_ld_z_separate_code to 1 for
Linux/x86 targets.
* config.in: Regenerated.
* configure: Likewise.
* emultempl/elf32.em (gld${EMULATION_NAME}_before_parse): Set
link_info.separate_code DEFAULT_LD_Z_SEPARATE_CODE.
Diffstat (limited to 'ld/configure.ac')
| -rw-r--r-- | ld/configure.ac | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/ld/configure.ac b/ld/configure.ac index 6da8c8e..3552926 100644 --- a/ld/configure.ac +++ b/ld/configure.ac @@ -177,6 +177,16 @@ AC_ARG_ENABLE(relro, no) ac_default_ld_z_relro=0 ;; esac])dnl +# Decide if -z separate-code should be enabled in ELF linker by default. +ac_default_ld_z_separate_code=unset +AC_ARG_ENABLE(separate-code, + AS_HELP_STRING([--enable-separate-code], + [enable -z separate-code in ELF linker by default]), +[case "${enableval}" in + yes) ac_default_ld_z_separate_code=1 ;; + no) ac_default_ld_z_separate_code=0 ;; +esac]) + # Decide which "--hash-style" to use by default # Provide a configure time option to override our default. AC_ARG_ENABLE([default-hash-style], @@ -434,6 +444,13 @@ AC_DEFINE_UNQUOTED(DEFAULT_LD_Z_RELRO, $ac_default_ld_z_relro, [Define to 1 if you want to enable -z relro in ELF linker by default.]) +if test "${ac_default_ld_z_separate_code}" = unset; then + ac_default_ld_z_separate_code=0 +fi +AC_DEFINE_UNQUOTED(DEFAULT_LD_Z_SEPARATE_CODE, + $ac_default_ld_z_separate_code, + [Define to 1 if you want to enable -z separate-code in ELF linker by default.]) + AC_DEFINE_UNQUOTED([DEFAULT_EMIT_SYSV_HASH], [$ac_default_emit_sysv_hash], [Define to 1 if you want to emit sysv hash in the ELF linker by default.]) |