x86/acpi: Use %rip-relative addressing in wakeup_64.S

This is a "nice-to-have" change with minor code generation benefits:

 - Instruction with %rip-relative address operand is one byte shorter than
   its absolute address counterpart,

 - it is also compatible with position independent executable (-fpie) builds,

 - it is also consistent with what the compiler emits by default when
   a symbol is accessed.

No functional changes intended.

Signed-off-by: Uros Bizjak <ubizjak@gmail.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Acked-by: Rafael J. Wysocki <rafael@kernel.org>
Link: https://lore.kernel.org/r/20231103104900.409470-1-ubizjak@gmail.com

diff --git a/arch/x86/kernel/acpi/wakeup_64.S b/arch/x86/kernel/acpi/wakeup_64.S
index d5d8a352eafaa1b0bf77bd61a1f4edf444d9b23b..94ff83f3d3fe927dbd67a00f8ad2cb91eb276486 100644 (file)
--- 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)
@@ -72,11 +72,11 @@ SYM_FUNC_START(do_suspend_lowlevel)
 
        movq    $.Lresume_point, 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