s390/entry: Move early program check handler to entry.S

JIRA: https://issues.redhat.com/browse/RHEL-113452

commit f2bb5b9
Author: Heiko Carstens <hca@linux.ibm.com>
Date:   Wed Jul 31 15:25:59 2024 +0200

    s390/entry: Move early program check handler to entry.S

    Have all program check handlers in one file to make future changes easy.

    Reviewed-by: Alexander Gordeev <agordeev@linux.ibm.com>
    Reviewed-by: Sven Schnelle <svens@linux.ibm.com>
    Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
    Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>

Conflicts:
    arch/s390/kernel/Makefile
    (conflict due to missing patch "kbuild: use obj-y instead extra-y for
     objects placed at the head" in downstream)
Signed-off-by: Thomas Huth <thuth@redhat.com>

Author: huth

arch/s390/kernel/Makefile

@@ -36,7 +36,7 @@ CFLAGS_stacktrace.o	+= -fno-optimize-sibling-calls
 CFLAGS_dumpstack.o	+= -fno-optimize-sibling-calls
 CFLAGS_unwind_bc.o	+= -fno-optimize-sibling-calls
 
-obj-y	:= traps.o time.o process.o earlypgm.o early.o setup.o idle.o vtime.o
+obj-y	:= traps.o time.o process.o early.o setup.o idle.o vtime.o
 obj-y	+= processor.o syscall.o ptrace.o signal.o cpcmd.o ebcdic.o nmi.o
 obj-y	+= debug.o irq.o ipl.o dis.o vdso.o cpufeature.o
 obj-y	+= sysinfo.o lgr.o os_info.o ctlreg.o

arch/s390/kernel/earlypgm.S

@@ -583,6 +583,21 @@ SYM_CODE_START(restart_int_handler)
 3:	j	3b
 SYM_CODE_END(restart_int_handler)
 
+SYM_CODE_START(early_pgm_check_handler)
+	stmg	%r8,%r15,__LC_SAVE_AREA_SYNC
+	aghi	%r15,-(STACK_FRAME_OVERHEAD+__PT_SIZE)
+	la	%r11,STACK_FRAME_OVERHEAD(%r15)
+	xc	__SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15)
+	stmg	%r0,%r7,__PT_R0(%r11)
+	mvc	__PT_PSW(16,%r11),__LC_PGM_OLD_PSW
+	mvc	__PT_R8(64,%r11),__LC_SAVE_AREA_SYNC
+	lgr	%r2,%r11
+	brasl	%r14,__do_early_pgm_check
+	mvc	__LC_RETURN_PSW(16),STACK_FRAME_OVERHEAD+__PT_PSW(%r15)
+	lmg	%r0,%r15,STACK_FRAME_OVERHEAD+__PT_R0(%r15)
+	lpswe	__LC_RETURN_PSW
+SYM_CODE_END(early_pgm_check_handler)
+
 	.section .kprobes.text, "ax"
 
 #if defined(CONFIG_CHECK_STACK) || defined(CONFIG_VMAP_STACK)