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[RFC,02/22] x86: Use symbol name on bug table for PIE support

Message ID 20170718223333.110371-3-thgarnie@google.com (mailing list archive)
State New, archived
Headers show

Commit Message

Thomas Garnier July 18, 2017, 10:33 p.m. UTC 
Replace the %c constraint with %P. The %c is incompatible with PIE
because it implies an immediate value whereas %P reference a symbol.

Position Independent Executable (PIE) support will allow to extended the
KASLR randomization range below the -2G memory limit.

Signed-off-by: Thomas Garnier <thgarnie@google.com>
---
 arch/x86/include/asm/bug.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
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Patch

diff --git a/arch/x86/include/asm/bug.h b/arch/x86/include/asm/bug.h
index 39e702d90cdb..2307e2aceb00 100644
--- a/arch/x86/include/asm/bug.h
+++ b/arch/x86/include/asm/bug.h
@@ -37,7 +37,7 @@  do {									\
 	asm volatile("1:\t" ins "\n"					\
 		     ".pushsection __bug_table,\"a\"\n"			\
 		     "2:\t" __BUG_REL(1b) "\t# bug_entry::bug_addr\n"	\
-		     "\t"  __BUG_REL(%c0) "\t# bug_entry::file\n"	\
+		     "\t"  __BUG_REL(%P0) "\t# bug_entry::file\n"	\
 		     "\t.word %c1"        "\t# bug_entry::line\n"	\
 		     "\t.word %c2"        "\t# bug_entry::flags\n"	\
 		     "\t.org 2b+%c3\n"					\