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[PATCH 0/5] Improve x86 Position-Independent codegen
- From: "H.J. Lu" <hjl dot tools at gmail dot com>
- To: gcc-patches at gcc dot gnu dot org
- Date: Thu, 22 Oct 2015 10:09:00 -0700
- Subject: [PATCH 0/5] Improve x86 Position-Independent codegen
- Authentication-results: sourceware.org; auth=none
This set of patches improves x86 Position-Independent codegen by
1. Use copy reloction to access externally defined global data from
PIE if linker supports it.
2. Add -fsymbolic to control how references to global symbols are
bound, avoiding copy relocation in PIE against DSO created by
-Wl,-Bsymbolic.
3. Pass -fsymbolic to GCC if -Bsymbolic is used with -flto.
4. Properly handle -fno-plt in ix86_expand_call
5. Generate R_386_GOT32x relocation for -fno-plt -fno-pic if binutils
supports R_386_GOT32x.
H.J. Lu (5):
X86: Optimize access to globals in PIE with copy reloc
Enable -fsymbolic in LTO if -Bsymbolic is used
Properly handle -fno-plt in ix86_expand_call
Check if x86 binutils supports R_386_GOT32X/R_X86_64_GOTPCRELX
Generate R_386_GOT32x relocation for -fno-plt -fno-pic
gcc/calls.c | 12 --
gcc/collect2.c | 51 ++++++++-
gcc/common.opt | 4 +
gcc/config.in | 29 ++++-
gcc/config/i386/i386.c | 134 +++++++++++++++++------
gcc/config/i386/predicates.md | 7 +-
gcc/configure | 129 ++++++++++++++++++++--
gcc/configure.ac | 109 ++++++++++++++++--
gcc/doc/invoke.texi | 13 ++-
gcc/doc/tm.texi | 10 ++
gcc/doc/tm.texi.in | 2 +
gcc/output.h | 4 +-
gcc/target.def | 14 +++
gcc/testsuite/gcc.target/i386/pie-copyrelocs-1.c | 4 +-
gcc/testsuite/gcc.target/i386/pie-copyrelocs-2.c | 4 +-
gcc/testsuite/gcc.target/i386/pie-copyrelocs-3.c | 2 +-
gcc/testsuite/gcc.target/i386/pie-copyrelocs-4.c | 4 +-
gcc/testsuite/gcc.target/i386/pr32219-10.c | 16 +++
gcc/testsuite/gcc.target/i386/pr32219-9.c | 2 +
gcc/testsuite/gcc.target/i386/pr65886-1.c | 17 +++
gcc/testsuite/gcc.target/i386/pr65886-2.c | 15 +++
gcc/testsuite/gcc.target/i386/pr65886-3.c | 16 +++
gcc/testsuite/gcc.target/i386/pr65886-4.c | 15 +++
gcc/testsuite/gcc.target/i386/pr65886-5.c | 18 +++
gcc/testsuite/gcc.target/i386/pr65886-6.c | 18 +++
gcc/testsuite/gcc.target/i386/pr66232-10.c | 13 +++
gcc/testsuite/gcc.target/i386/pr66232-11.c | 14 +++
gcc/testsuite/gcc.target/i386/pr66232-12.c | 13 +++
gcc/testsuite/gcc.target/i386/pr66232-13.c | 13 +++
gcc/testsuite/gcc.target/i386/pr67215-1.c | 20 ++++
gcc/testsuite/gcc.target/i386/pr67215-2.c | 20 ++++
gcc/testsuite/gcc.target/i386/pr67215-3.c | 13 +++
gcc/testsuite/lib/target-supports.exp | 114 ++++++++++++++++++-
gcc/varasm.c | 69 +++++++++---
34 files changed, 848 insertions(+), 90 deletions(-)
create mode 100644 gcc/testsuite/gcc.target/i386/pr32219-10.c
create mode 100644 gcc/testsuite/gcc.target/i386/pr65886-1.c
create mode 100644 gcc/testsuite/gcc.target/i386/pr65886-2.c
create mode 100644 gcc/testsuite/gcc.target/i386/pr65886-3.c
create mode 100644 gcc/testsuite/gcc.target/i386/pr65886-4.c
create mode 100644 gcc/testsuite/gcc.target/i386/pr65886-5.c
create mode 100644 gcc/testsuite/gcc.target/i386/pr65886-6.c
create mode 100644 gcc/testsuite/gcc.target/i386/pr66232-10.c
create mode 100644 gcc/testsuite/gcc.target/i386/pr66232-11.c
create mode 100644 gcc/testsuite/gcc.target/i386/pr66232-12.c
create mode 100644 gcc/testsuite/gcc.target/i386/pr66232-13.c
create mode 100644 gcc/testsuite/gcc.target/i386/pr67215-1.c
create mode 100644 gcc/testsuite/gcc.target/i386/pr67215-2.c
create mode 100644 gcc/testsuite/gcc.target/i386/pr67215-3.c
--
2.4.3