linux-kernel - [PATCH 2/4] arm64: Track the sigreturn landing pad location

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Message-Id: <20210529081620.164422-3-Houdek.Ryan@fex-emu.org>
Date:   Sat, 29 May 2021 01:16:18 -0700
From:   houdek.ryan@...-emu.org
To:     unlisted-recipients:; (no To-header on input)
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Ryan Houdek <Houdek.Ryan@...-emu.org>
Subject: [PATCH 2/4] arm64: Track the sigreturn landing pad location

From: Ryan Houdek <Houdek.Ryan@...-emu.org>

This will be required once userspace dispatch is implemented

Signed-off-by: Ryan Houdek <Houdek.Ryan@...-emu.org>
---
 arch/arm64/kernel/vdso/sigreturn.S | 1 +
 arch/arm64/kernel/vdso/vdso.lds.S  | 1 +
 2 files changed, 2 insertions(+)

diff --git a/arch/arm64/kernel/vdso/sigreturn.S b/arch/arm64/kernel/vdso/sigreturn.S
index 0e18729abc3b..44ed8c5486d0 100644
--- a/arch/arm64/kernel/vdso/sigreturn.S
+++ b/arch/arm64/kernel/vdso/sigreturn.S
@@ -73,6 +73,7 @@ SYM_CODE_START(__kernel_rt_sigreturn)
 	mov	x8, #__NR_rt_sigreturn
 //	PLEASE DO NOT MODIFY
 	svc	#0
+SYM_INNER_LABEL(__kernel_vdso_sigreturn_landing_pad, SYM_L_GLOBAL)
 //	PLEASE DO NOT MODIFY
 //	.cfi_endproc
 SYM_CODE_END(__kernel_rt_sigreturn)
diff --git a/arch/arm64/kernel/vdso/vdso.lds.S b/arch/arm64/kernel/vdso/vdso.lds.S
index a5e61e09ea92..65d2bd880e2f 100644
--- a/arch/arm64/kernel/vdso/vdso.lds.S
+++ b/arch/arm64/kernel/vdso/vdso.lds.S
@@ -91,3 +91,4 @@ VERSION
  * Make the sigreturn code visible to the kernel.
  */
 VDSO_sigtramp		= __kernel_rt_sigreturn;
+VDSO_vdso_sigreturn_landing_pad	= __kernel_vdso_sigreturn_landing_pad;
-- 
2.30.2