diff mbox series

[v2,09/17] x86: Move return_thunk to __pitext section

Message ID 20240125112818.2016733-28-ardb+git@google.com
State New
Headers
Series x86: Confine early 1:1 mapped startup code |

Commit Message

Ard Biesheuvel Jan. 25, 2024, 11:28 a.m. UTC 
  From: Ard Biesheuvel <ardb@kernel.org>

The x86 return thunk will function correctly even when it is called via
a different virtual mapping than the one it was linked at, so it can
safely be moved to .pi.text. This allows other code in that section to
call it.

Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
---
 arch/x86/kernel/vmlinux.lds.S | 2 +-
 arch/x86/lib/retpoline.S      | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)
diff mbox series

Patch

diff --git a/arch/x86/kernel/vmlinux.lds.S b/arch/x86/kernel/vmlinux.lds.S
index a349dbfc6d5a..77262e804250 100644
--- a/arch/x86/kernel/vmlinux.lds.S
+++ b/arch/x86/kernel/vmlinux.lds.S
@@ -134,7 +134,7 @@  SECTIONS
 		SOFTIRQENTRY_TEXT
 #ifdef CONFIG_RETPOLINE
 		*(.text..__x86.indirect_thunk)
-		*(.text..__x86.return_thunk)
+		*(.pi.text..__x86.return_thunk)
 #endif
 		STATIC_CALL_TEXT
 
diff --git a/arch/x86/lib/retpoline.S b/arch/x86/lib/retpoline.S
index 7b2589877d06..003b35445bbb 100644
--- a/arch/x86/lib/retpoline.S
+++ b/arch/x86/lib/retpoline.S
@@ -136,7 +136,7 @@  SYM_CODE_END(__x86_indirect_jump_thunk_array)
  * relocations for same-section JMPs and that breaks the returns
  * detection logic in apply_returns() and in objtool.
  */
-	.section .text..__x86.return_thunk
+	.section .pi.text..__x86.return_thunk, "ax"
 
 #ifdef CONFIG_CPU_SRSO