[v8,02/11] x86: Add macro to get symbol address for PIE support
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Message ID 20190708174913.123308-3-thgarnie@chromium.org
State New
Headers show
  • x86: PIE support to extend KASLR randomization
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Commit Message

Thomas Garnier July 8, 2019, 5:48 p.m. UTC
Add a new _ASM_MOVABS macro to fetch a symbol address. It will be used
to replace "_ASM_MOV $<symbol>, %dst" code construct that are not
compatible with PIE.

Signed-off-by: Thomas Garnier <thgarnie@chromium.org>
 arch/x86/include/asm/asm.h | 1 +
 1 file changed, 1 insertion(+)

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diff --git a/arch/x86/include/asm/asm.h b/arch/x86/include/asm/asm.h
index 3ff577c0b102..3a686057e882 100644
--- a/arch/x86/include/asm/asm.h
+++ b/arch/x86/include/asm/asm.h
@@ -30,6 +30,7 @@ 
 #define _ASM_ALIGN	__ASM_SEL(.balign 4, .balign 8)
 #define _ASM_MOV	__ASM_SIZE(mov)
+#define _ASM_MOVABS	__ASM_SEL(movl, movabsq)
 #define _ASM_INC	__ASM_SIZE(inc)
 #define _ASM_DEC	__ASM_SIZE(dec)
 #define _ASM_ADD	__ASM_SIZE(add)