[v9,05/11] x86: pm-trace - Adapt assembly for PIE support
diff mbox series

Message ID 20190730191303.206365-6-thgarnie@chromium.org
State New
Headers show
Series
  • x86: PIE support to extend KASLR randomization
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Commit Message

Thomas Garnier July 30, 2019, 7:12 p.m. UTC
Change assembly to use the new _ASM_MOVABS macro instead of _ASM_MOV for
the assembly to be PIE compatible.

Position Independent Executable (PIE) support will allow to extend the
KASLR randomization range below 0xffffffff80000000.

Signed-off-by: Thomas Garnier <thgarnie@chromium.org>
Reviewed-by: Kees Cook <keescook@chromium.org>
---
 arch/x86/include/asm/pm-trace.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Patch
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diff --git a/arch/x86/include/asm/pm-trace.h b/arch/x86/include/asm/pm-trace.h
index bfa32aa428e5..972070806ce9 100644
--- a/arch/x86/include/asm/pm-trace.h
+++ b/arch/x86/include/asm/pm-trace.h
@@ -8,7 +8,7 @@ 
 do {								\
 	if (pm_trace_enabled) {					\
 		const void *tracedata;				\
-		asm volatile(_ASM_MOV " $1f,%0\n"		\
+		asm volatile(_ASM_MOVABS " $1f,%0\n"		\
 			     ".section .tracedata,\"a\"\n"	\
 			     "1:\t.word %c1\n\t"		\
 			     _ASM_PTR " %c2\n"			\