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authorIgor Zamyatin <igor.zamyatin@intel.com>2014-04-01 10:16:04 -0700
committerH.J. Lu <hjl.tools@gmail.com>2014-04-09 15:38:09 -0700
commita4c75cfd56e536c2b18556e8a482d88dffa0fffc (patch)
tree209bb53676f4cee8fde2a1f9d038829dd78fe28c /config.h.in
parent27822ce67fbf7f2b204992a410e7da2e8c1e2607 (diff)
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Save/restore bound registers in _dl_runtime_resolve
This patch saves and restores bound registers in symbol lookup for x86-64:

1. Branches without BND prefix clear bound registers.
2. x86-64 pass bounds in bound registers as specified in MPX psABI
extension on hjl/mpx/master branch at

https://github.com/hjl-tools/x86-64-psABI
https://groups.google.com/forum/#!topic/x86-64-abi/KFsB0XTgWYc

Binutils has been updated to create an alternate PLT to add BND prefix
when branching to ld.so.

	* config.h.in (HAVE_MPX_SUPPORT): New #undef.
	* sysdeps/x86_64/configure.ac: Set HAVE_MPX_SUPPORT.
	* sysdeps/x86_64/configure: Regenerated.
	* sysdeps/x86_64/dl-trampoline.S (REGISTER_SAVE_AREA): New
	macro.
	(REGISTER_SAVE_RAX): Likewise.
	(REGISTER_SAVE_RCX): Likewise.
	(REGISTER_SAVE_RDX): Likewise.
	(REGISTER_SAVE_RSI): Likewise.
	(REGISTER_SAVE_RDI): Likewise.
	(REGISTER_SAVE_R8): Likewise.
	(REGISTER_SAVE_R9): Likewise.
	(REGISTER_SAVE_BND0): Likewise.
	(REGISTER_SAVE_BND1): Likewise.
	(REGISTER_SAVE_BND2): Likewise.
	(_dl_runtime_resolve): Use them.  Save and restore Intel MPX
	bound registers when calling _dl_fixup.
Diffstat (limited to 'config.h.in')
-rw-r--r--config.h.in3
1 files changed, 3 insertions, 0 deletions
diff --git a/config.h.in b/config.h.in
index 3fc34bdb1e..b6e3623d92 100644
--- a/config.h.in
+++ b/config.h.in
@@ -104,6 +104,9 @@
 /* Define if assembler supports AVX512.  */
 #undef  HAVE_AVX512_ASM_SUPPORT
 
+/* Define if assembler supports Intel MPX.  */
+#undef  HAVE_MPX_SUPPORT
+
 /* Define if gcc supports FMA4.  */
 #undef	HAVE_FMA4_SUPPORT