powerpc/32: Add a prepare_transfer_to_handler macro for exception prologs

In order to increase flexibility, add a macro that will for now
call transfer_to_handler.

As transfer_to_handler doesn't do the actual transfer anymore,
also name it prepare_transfer_to_handler. The following patches
will progressively remove the use of transfer_to_handler label.
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/7f757c52518ab1d7b27ad5113b10f860e803f467.1615552867.git.christophe.leroy@csgroup.eu

arch/powerpc/kernel/entry_32.S

@@ -86,6 +86,8 @@ _ASM_NOKPROBE_SYMBOL(transfer_to_handler_full)
 
 	.globl	transfer_to_handler
 transfer_to_handler:
+	.globl	prepare_transfer_to_handler
+prepare_transfer_to_handler:
 	SAVE_NVGPRS(r11)
 	addi	r3,r1,STACK_FRAME_OVERHEAD
 	stw	r2,GPR2(r11)
@@ -133,6 +135,7 @@ transfer_to_handler_cont:
 	lwz	r2, GPR2(r11)
 	b	fast_exception_return
 #endif
+_ASM_NOKPROBE_SYMBOL(prepare_transfer_to_handler)
 _ASM_NOKPROBE_SYMBOL(transfer_to_handler)
 _ASM_NOKPROBE_SYMBOL(transfer_to_handler_cont)
 

arch/powerpc/kernel/head_32.h

@@ -115,6 +115,10 @@
 _ASM_NOKPROBE_SYMBOL(\name\()_virt)
 .endm
 
+.macro prepare_transfer_to_handler
+	bl	prepare_transfer_to_handler
+.endm
+
 .macro SYSCALL_ENTRY trapno
 	mfspr	r9, SPRN_SRR1
 	mfspr	r10, SPRN_SRR0

arch/powerpc/kernel/head_booke.h

@@ -87,6 +87,10 @@ END_BTB_FLUSH_SECTION
 	SAVE_4GPRS(3, r11);						     \
 	SAVE_2GPRS(7, r11)
 
+.macro prepare_transfer_to_handler
+	bl	prepare_transfer_to_handler
+.endm
+
 .macro SYSCALL_ENTRY trapno intno srr1
 	mfspr	r10, SPRN_SPRG_THREAD
 #ifdef CONFIG_KVM_BOOKE_HV