s390: simplify early program check handler
Due to historic reasons the base program check handler calls a
configurable function. Given that there is only the early program
check handler left, simplify the code by directly calling that
function.
The only other user was removed with commit d485235b0054 ("s390:
assume diag308 set always works").
Also rename all functions and the asm file to reflect this.
Reviewed-by: Sven Schnelle <svens@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
diff --git a/arch/s390/include/asm/processor.h b/arch/s390/include/asm/processor.h
index add764a..bd66f8e 100644
--- a/arch/s390/include/asm/processor.h
+++ b/arch/s390/include/asm/processor.h
@@ -304,12 +304,6 @@ static __always_inline void __noreturn disabled_wait(void)
while (1);
}
-/*
- * Basic Program Check Handler.
- */
-extern void s390_base_pgm_handler(void);
-extern void (*s390_base_pgm_handler_fn)(struct pt_regs *regs);
-
#define ARCH_LOW_ADDRESS_LIMIT 0x7fffffffUL
extern int memcpy_real(void *, unsigned long, size_t);
diff --git a/arch/s390/kernel/Makefile b/arch/s390/kernel/Makefile
index 5851041..27d6b3c7 100644
--- a/arch/s390/kernel/Makefile
+++ b/arch/s390/kernel/Makefile
@@ -33,7 +33,7 @@
CFLAGS_dumpstack.o += -fno-optimize-sibling-calls
CFLAGS_unwind_bc.o += -fno-optimize-sibling-calls
-obj-y := traps.o time.o process.o base.o early.o setup.o idle.o vtime.o
+obj-y := traps.o time.o process.o earlypgm.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 diag.o vdso.o
obj-y += sysinfo.o lgr.o os_info.o machine_kexec.o
diff --git a/arch/s390/kernel/base.S b/arch/s390/kernel/base.S
deleted file mode 100644
index 172c23c..0000000
--- a/arch/s390/kernel/base.S
+++ /dev/null
@@ -1,50 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-/*
- * arch/s390/kernel/base.S
- *
- * Copyright IBM Corp. 2006, 2007
- * Author(s): Michael Holzheu <holzheu@de.ibm.com>
- */
-
-#include <linux/linkage.h>
-#include <asm/asm-offsets.h>
-#include <asm/nospec-insn.h>
-#include <asm/ptrace.h>
-
- GEN_BR_THUNK %r9
- GEN_BR_THUNK %r14
-
-__PT_R0 = __PT_GPRS
-__PT_R8 = __PT_GPRS + 64
-
-ENTRY(s390_base_pgm_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
- larl %r1,s390_base_pgm_handler_fn
- lg %r9,0(%r1)
- ltgr %r9,%r9
- jz 1f
- BASR_EX %r14,%r9
- mvc __LC_RETURN_PSW(16),STACK_FRAME_OVERHEAD+__PT_PSW(%r15)
- lmg %r0,%r15,STACK_FRAME_OVERHEAD+__PT_R0(%r15)
- lpswe __LC_RETURN_PSW
-1: larl %r13,disabled_wait_psw
- lpswe 0(%r13)
-ENDPROC(s390_base_pgm_handler)
-
- .align 8
-disabled_wait_psw:
- .quad 0x0002000180000000,0x0000000000000000 + s390_base_pgm_handler
-
- .section .bss
- .align 8
- .globl s390_base_pgm_handler_fn
-s390_base_pgm_handler_fn:
- .quad 0
- .previous
diff --git a/arch/s390/kernel/early.c b/arch/s390/kernel/early.c
index 08cc86a0..432c8c9 100644
--- a/arch/s390/kernel/early.c
+++ b/arch/s390/kernel/early.c
@@ -149,7 +149,7 @@ static __init void setup_topology(void)
topology_max_mnest = max_mnest;
}
-static void early_pgm_check_handler(struct pt_regs *regs)
+void __do_early_pgm_check(struct pt_regs *regs)
{
if (!fixup_exception(regs))
disabled_wait();
@@ -159,12 +159,11 @@ static noinline __init void setup_lowcore_early(void)
{
psw_t psw;
- psw.addr = (unsigned long)s390_base_pgm_handler;
+ psw.addr = (unsigned long)early_pgm_check_handler;
psw.mask = PSW_MASK_BASE | PSW_DEFAULT_KEY | PSW_MASK_EA | PSW_MASK_BA;
if (IS_ENABLED(CONFIG_KASAN))
psw.mask |= PSW_MASK_DAT;
S390_lowcore.program_new_psw = psw;
- s390_base_pgm_handler_fn = early_pgm_check_handler;
S390_lowcore.preempt_count = INIT_PREEMPT_COUNT;
}
diff --git a/arch/s390/kernel/earlypgm.S b/arch/s390/kernel/earlypgm.S
new file mode 100644
index 0000000..fbc7d2d
--- /dev/null
+++ b/arch/s390/kernel/earlypgm.S
@@ -0,0 +1,26 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright IBM Corp. 2006, 2007
+ * Author(s): Michael Holzheu <holzheu@de.ibm.com>
+ */
+
+#include <linux/linkage.h>
+#include <asm/asm-offsets.h>
+
+__PT_R0 = __PT_GPRS
+__PT_R8 = __PT_GPRS + 64
+
+ENTRY(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
+ENDPROC(early_pgm_check_handler)
diff --git a/arch/s390/kernel/entry.h b/arch/s390/kernel/entry.h
index 56e5e37..995ec74 100644
--- a/arch/s390/kernel/entry.h
+++ b/arch/s390/kernel/entry.h
@@ -17,10 +17,12 @@ void ext_int_handler(void);
void io_int_handler(void);
void mcck_int_handler(void);
void restart_int_handler(void);
+void early_pgm_check_handler(void);
void __ret_from_fork(struct task_struct *prev, struct pt_regs *regs);
void __do_pgm_check(struct pt_regs *regs);
void __do_syscall(struct pt_regs *regs, int per_trap);
+void __do_early_pgm_check(struct pt_regs *regs);
void do_protection_exception(struct pt_regs *regs);
void do_dat_exception(struct pt_regs *regs);
