LoongArch: Add JUMP_VIRT_ADDR macro implementation to avoid using la.abs

Add JUMP_VIRT_ADDR macro implementation to avoid using la.abs directly.
This is a preparation for subsequent patches.
Signed-off-by: Youling Tang <tangyouling@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>

arch/loongarch/include/asm/stackframe.h

@@ -7,6 +7,7 @@
 
 #include <linux/threads.h>
 
+#include <asm/addrspace.h>
 #include <asm/asm.h>
 #include <asm/asmmacro.h>
 #include <asm/asm-offsets.h>
@@ -36,6 +37,14 @@
 	cfi_restore \reg \offset \docfi
 	.endm
 
+/* Jump to the runtime virtual address. */
+	.macro JUMP_VIRT_ADDR temp1 temp2
+	li.d	\temp1, CACHE_BASE
+	pcaddi	\temp2, 0
+	or	\temp1, \temp1, \temp2
+	jirl	zero, \temp1, 0xc
+	.endm
+
 	.macro BACKUP_T0T1
 	csrwr	t0, EXCEPTION_KS0
 	csrwr	t1, EXCEPTION_KS1

arch/loongarch/kernel/head.S

@@ -50,11 +50,8 @@ SYM_CODE_START(kernel_entry)			# kernel entry point
 	li.d		t0, CSR_DMW1_INIT	# CA, PLV0, 0x9000 xxxx xxxx xxxx
 	csrwr		t0, LOONGARCH_CSR_DMWIN1
 
-	/* 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_VIRT_ADDR	t0, t1
+
 	/* Enable PG */
 	li.w		t0, 0xb0		# PLV=0, IE=0, PG=1
 	csrwr		t0, LOONGARCH_CSR_CRMD
@@ -106,9 +103,8 @@ 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_VIRT_ADDR	t0, t1
+
 	/* Enable PG */
 	li.w		t0, 0xb0		# PLV=0, IE=0, PG=1
 	csrwr		t0, LOONGARCH_CSR_CRMD

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_VIRT_ADDR	t0, t1
+
 	la.pcrel	t0, acpi_saved_sp
 	ld.d		sp, t0, 0
 	SETUP_WAKEUP