diff mbox series

[RFC,07/43] x86/acpi: Adapt assembly for PIE support

Message ID 8b90798cb41604b2e2d47c8fcbb67913daafd85d.1682673543.git.houwenlong.hwl@antgroup.com
State New
Headers
Series x86/pie: Make kernel image's virtual address flexible |

Commit Message

Hou Wenlong April 28, 2023, 9:50 a.m. UTC 
  From: Thomas Garnier <thgarnie@chromium.org>

From: Thomas Garnier <thgarnie@chromium.org>

Change the assembly code to use only relative references of symbols for the
kernel to be PIE compatible.

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/kernel/acpi/wakeup_64.S | 31 ++++++++++++++++---------------
 1 file changed, 16 insertions(+), 15 deletions(-)

Comments

Rafael J. Wysocki April 28, 2023, 11:32 a.m. UTC | #1 
On Fri, Apr 28, 2023 at 11:52 AM Hou Wenlong
<houwenlong.hwl@antgroup.com> wrote:
>
> From: Thomas Garnier <thgarnie@chromium.org>
>
> From: Thomas Garnier <thgarnie@chromium.org>
>
> Change the assembly code to use only relative references of symbols for the
> kernel to be PIE compatible.
>
> 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>

Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

> ---
>  arch/x86/kernel/acpi/wakeup_64.S | 31 ++++++++++++++++---------------
>  1 file changed, 16 insertions(+), 15 deletions(-)
>
> diff --git a/arch/x86/kernel/acpi/wakeup_64.S b/arch/x86/kernel/acpi/wakeup_64.S
> index d5d8a352eafa..fe688bd87d72 100644
> --- a/arch/x86/kernel/acpi/wakeup_64.S
> +++ b/arch/x86/kernel/acpi/wakeup_64.S
> @@ -17,7 +17,7 @@
>          * Hooray, we are in Long 64-bit mode (but still running in low memory)
>          */
>  SYM_FUNC_START(wakeup_long64)
> -       movq    saved_magic, %rax
> +       movq    saved_magic(%rip), %rax
>         movq    $0x123456789abcdef0, %rdx
>         cmpq    %rdx, %rax
>         je      2f
> @@ -33,14 +33,14 @@ SYM_FUNC_START(wakeup_long64)
>         movw    %ax, %es
>         movw    %ax, %fs
>         movw    %ax, %gs
> -       movq    saved_rsp, %rsp
> +       movq    saved_rsp(%rip), %rsp
>
> -       movq    saved_rbx, %rbx
> -       movq    saved_rdi, %rdi
> -       movq    saved_rsi, %rsi
> -       movq    saved_rbp, %rbp
> +       movq    saved_rbx(%rip), %rbx
> +       movq    saved_rdi(%rip), %rdi
> +       movq    saved_rsi(%rip), %rsi
> +       movq    saved_rbp(%rip), %rbp
>
> -       movq    saved_rip, %rax
> +       movq    saved_rip(%rip), %rax
>         ANNOTATE_RETPOLINE_SAFE
>         jmp     *%rax
>  SYM_FUNC_END(wakeup_long64)
> @@ -51,7 +51,7 @@ SYM_FUNC_START(do_suspend_lowlevel)
>         xorl    %eax, %eax
>         call    save_processor_state
>
> -       movq    $saved_context, %rax
> +       leaq    saved_context(%rip), %rax
>         movq    %rsp, pt_regs_sp(%rax)
>         movq    %rbp, pt_regs_bp(%rax)
>         movq    %rsi, pt_regs_si(%rax)
> @@ -70,13 +70,14 @@ SYM_FUNC_START(do_suspend_lowlevel)
>         pushfq
>         popq    pt_regs_flags(%rax)
>
> -       movq    $.Lresume_point, saved_rip(%rip)
> +       leaq    .Lresume_point(%rip), %rax
> +       movq    %rax, saved_rip(%rip)
>
> -       movq    %rsp, saved_rsp
> -       movq    %rbp, saved_rbp
> -       movq    %rbx, saved_rbx
> -       movq    %rdi, saved_rdi
> -       movq    %rsi, saved_rsi
> +       movq    %rsp, saved_rsp(%rip)
> +       movq    %rbp, saved_rbp(%rip)
> +       movq    %rbx, saved_rbx(%rip)
> +       movq    %rdi, saved_rdi(%rip)
> +       movq    %rsi, saved_rsi(%rip)
>
>         addq    $8, %rsp
>         movl    $3, %edi
> @@ -88,7 +89,7 @@ SYM_FUNC_START(do_suspend_lowlevel)
>         .align 4
>  .Lresume_point:
>         /* We don't restore %rax, it must be 0 anyway */
> -       movq    $saved_context, %rax
> +       leaq    saved_context(%rip), %rax
>         movq    saved_context_cr4(%rax), %rbx
>         movq    %rbx, %cr4
>         movq    saved_context_cr3(%rax), %rbx
> --
> 2.31.1
>
diff mbox series

Patch

diff --git a/arch/x86/kernel/acpi/wakeup_64.S b/arch/x86/kernel/acpi/wakeup_64.S
index d5d8a352eafa..fe688bd87d72 100644
--- a/arch/x86/kernel/acpi/wakeup_64.S
+++ b/arch/x86/kernel/acpi/wakeup_64.S
@@ -17,7 +17,7 @@ 
 	 * Hooray, we are in Long 64-bit mode (but still running in low memory)
 	 */
 SYM_FUNC_START(wakeup_long64)
-	movq	saved_magic, %rax
+	movq	saved_magic(%rip), %rax
 	movq	$0x123456789abcdef0, %rdx
 	cmpq	%rdx, %rax
 	je	2f
@@ -33,14 +33,14 @@  SYM_FUNC_START(wakeup_long64)
 	movw	%ax, %es
 	movw	%ax, %fs
 	movw	%ax, %gs
-	movq	saved_rsp, %rsp
+	movq	saved_rsp(%rip), %rsp
 
-	movq	saved_rbx, %rbx
-	movq	saved_rdi, %rdi
-	movq	saved_rsi, %rsi
-	movq	saved_rbp, %rbp
+	movq	saved_rbx(%rip), %rbx
+	movq	saved_rdi(%rip), %rdi
+	movq	saved_rsi(%rip), %rsi
+	movq	saved_rbp(%rip), %rbp
 
-	movq	saved_rip, %rax
+	movq	saved_rip(%rip), %rax
 	ANNOTATE_RETPOLINE_SAFE
 	jmp	*%rax
 SYM_FUNC_END(wakeup_long64)
@@ -51,7 +51,7 @@  SYM_FUNC_START(do_suspend_lowlevel)
 	xorl	%eax, %eax
 	call	save_processor_state
 
-	movq	$saved_context, %rax
+	leaq	saved_context(%rip), %rax
 	movq	%rsp, pt_regs_sp(%rax)
 	movq	%rbp, pt_regs_bp(%rax)
 	movq	%rsi, pt_regs_si(%rax)
@@ -70,13 +70,14 @@  SYM_FUNC_START(do_suspend_lowlevel)
 	pushfq
 	popq	pt_regs_flags(%rax)
 
-	movq	$.Lresume_point, saved_rip(%rip)
+	leaq	.Lresume_point(%rip), %rax
+	movq	%rax, saved_rip(%rip)
 
-	movq	%rsp, saved_rsp
-	movq	%rbp, saved_rbp
-	movq	%rbx, saved_rbx
-	movq	%rdi, saved_rdi
-	movq	%rsi, saved_rsi
+	movq	%rsp, saved_rsp(%rip)
+	movq	%rbp, saved_rbp(%rip)
+	movq	%rbx, saved_rbx(%rip)
+	movq	%rdi, saved_rdi(%rip)
+	movq	%rsi, saved_rsi(%rip)
 
 	addq	$8, %rsp
 	movl	$3, %edi
@@ -88,7 +89,7 @@  SYM_FUNC_START(do_suspend_lowlevel)
 	.align 4
 .Lresume_point:
 	/* We don't restore %rax, it must be 0 anyway */
-	movq	$saved_context, %rax
+	leaq	saved_context(%rip), %rax
 	movq	saved_context_cr4(%rax), %rbx
 	movq	%rbx, %cr4
 	movq	saved_context_cr3(%rax), %rbx