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From: "Hou Wenlong" <houwenlong.hwl@antgroup.com>
To: linux-kernel@vger.kernel.org
Cc: "Thomas Garnier" <thgarnie@chromium.org>,
"Lai Jiangshan" <jiangshan.ljs@antgroup.com>,
"Kees Cook" <keescook@chromium.org>,
"Hou Wenlong" <houwenlong.hwl@antgroup.com>,
"Thomas Gleixner" <tglx@linutronix.de>,
"Ingo Molnar" <mingo@redhat.com>, "Borislav Petkov" <bp@alien8.de>,
"Dave Hansen" <dave.hansen@linux.intel.com>, <x86@kernel.org>,
"H. Peter Anvin" <hpa@zytor.com>
Subject: [PATCH RFC 02/43] x86: Add macro to get symbol address for PIE
support
Date: Fri, 28 Apr 2023 17:50:42 +0800
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| Series |
x86/pie: Make kernel image's virtual address flexible
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Commit Message
Hou Wenlong
April 28, 2023, 9:50 a.m. UTC
From: Thomas Garnier <thgarnie@chromium.org> From: Thomas Garnier <thgarnie@chromium.org> Add a new _ASM_MOVABS macro to fetch a symbol address. Replace "_ASM_MOV $<symbol>, %dst" code construct that are not compatible with PIE. Signed-off-by: Thomas Garnier <thgarnie@chromium.org> Signed-off-by: Hou Wenlong <houwenlong.hwl@antgroup.com> Cc: Lai Jiangshan <jiangshan.ljs@antgroup.com> Cc: Kees Cook <keescook@chromium.org> --- arch/x86/include/asm/asm.h | 1 + 1 file changed, 1 insertion(+)
diff --git a/arch/x86/include/asm/asm.h b/arch/x86/include/asm/asm.h index fbcfec4dc4cc..05974cc060c6 100644 --- a/arch/x86/include/asm/asm.h +++ b/arch/x86/include/asm/asm.h @@ -35,6 +35,7 @@ #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)