linux-kernel - [PATCH v3 3/5] LoongArch: Add JUMP_LINK_ADDR macro implementation to avoid using la.abs

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Date:   Thu,  9 Feb 2023 01:16:05 +0800
From:   Xi Ruoyao <xry111@...111.site>
To:     Youling Tang <tangyouling@...ngson.cn>,
        Huacai Chen <chenhuacai@...nel.org>,
        Jinyang He <hejinyang@...ngson.cn>
Cc:     Xuerui Wang <kernel@...0n.name>, loongarch@...ts.linux.dev,
        linux-kernel@...r.kernel.org
Subject: [PATCH v3 3/5] LoongArch: Add JUMP_LINK_ADDR macro implementation to avoid using la.abs

From: Youling Tang <tangyouling@...ngson.cn>

Add JUMP_LINK_ADDR macro implementation to avoid using la.abs.

Signed-off-by: Youling Tang <tangyouling@...ngson.cn>
---
 arch/loongarch/include/asm/stackframe.h |  8 ++++++++
 arch/loongarch/kernel/head.S            | 10 ++++------
 arch/loongarch/power/suspend_asm.S      |  5 ++---
 3 files changed, 14 insertions(+), 9 deletions(-)

diff --git a/arch/loongarch/include/asm/stackframe.h b/arch/loongarch/include/asm/stackframe.h
index bbec1e56b61b..cd8240858599 100644
--- a/arch/loongarch/include/asm/stackframe.h
+++ b/arch/loongarch/include/asm/stackframe.h
@@ -217,4 +217,12 @@
 	RESTORE_SP_AND_RET \docfi
 	.endm
 
+/* Jump to the virtual address of the link. */
+	.macro JUMP_LINK_ADDR
+	li.d	t0, CACHE_BASE
+	pcaddi	t1, 0
+	or	t0, t0, t1
+	jirl	zero, t0, 0xc
+	.endm
+
 #endif /* _ASM_STACKFRAME_H */
diff --git a/arch/loongarch/kernel/head.S b/arch/loongarch/kernel/head.S
index aa6181714ec3..e8a4bf9d7599 100644
--- a/arch/loongarch/kernel/head.S
+++ b/arch/loongarch/kernel/head.S
@@ -52,9 +52,8 @@ SYM_CODE_START(kernel_entry)			# kernel entry point
 
 	/* We might not get launched at the address the kernel is linked to,
 	   so we jump there.  */
-	la.abs		t0, 0f
-	jr		t0
-0:
+	JUMP_LINK_ADDR
+
 	/* Enable PG */
 	li.w		t0, 0xb0		# PLV=0, IE=0, PG=1
 	csrwr		t0, LOONGARCH_CSR_CRMD
@@ -106,9 +105,8 @@ SYM_CODE_START(smpboot_entry)
 	li.d		t0, CSR_DMW1_INIT	# CA, PLV0
 	csrwr		t0, LOONGARCH_CSR_DMWIN1
 
-	la.abs		t0, 0f
-	jr		t0
-0:
+	JUMP_LINK_ADDR
+
 	/* Enable PG */
 	li.w		t0, 0xb0		# PLV=0, IE=0, PG=1
 	csrwr		t0, LOONGARCH_CSR_CRMD
diff --git a/arch/loongarch/power/suspend_asm.S b/arch/loongarch/power/suspend_asm.S
index eb2675642f9f..596a682a7924 100644
--- a/arch/loongarch/power/suspend_asm.S
+++ b/arch/loongarch/power/suspend_asm.S
@@ -78,9 +78,8 @@ SYM_INNER_LABEL(loongarch_wakeup_start, SYM_L_GLOBAL)
 	li.d		t0, CSR_DMW1_INIT	# CA, PLV0
 	csrwr		t0, LOONGARCH_CSR_DMWIN1
 
-	la.abs		t0, 0f
-	jr		t0
-0:
+	JUMP_LINK_ADDR
+
 	la.pcrel	t0, acpi_saved_sp
 	ld.d		sp, t0, 0
 	SETUP_WAKEUP
-- 
2.39.1