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s390: introduce execute-trampolines for branches 

[ Upstream commit f19fbd5ed6 ]

Add CONFIG_EXPOLINE to enable the use of the new -mindirect-branch= and
-mfunction_return= compiler options to create a kernel fortified against
the specte v2 attack.

With CONFIG_EXPOLINE=y all indirect branches will be issued with an
execute type instruction. For z10 or newer the EXRL instruction will
be used, for older machines the EX instruction. The typical indirect
call

	basr	%r14,%r1

is replaced with a PC relative call to a new thunk

	brasl	%r14,__s390x_indirect_jump_r1

The thunk contains the EXRL/EX instruction to the indirect branch

__s390x_indirect_jump_r1:
	exrl	0,0f
	j	.
0:	br	%r1

The detour via the execute type instruction has a performance impact.
To get rid of the detour the new kernel parameter "nospectre_v2" and
"spectre_v2=[on,off,auto]" can be used. If the parameter is specified
the kernel and module code will be patched at runtime.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
pull/10/head
Martin Schwidefsky 2018-04-27 07:36:33 +02:00 committed by Greg Kroah-Hartman
parent 0bd4c47c20
commit b609eb65f3
12 changed files with 326 additions and 35 deletions
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28
arch/s390/Kconfig
View File

@ -555,6 +555,34 @@ config KERNEL_NOBP
If unsure, say N.
config EXPOLINE
def_bool n
prompt "Avoid speculative indirect branches in the kernel"
help
Compile the kernel with the expoline compiler options to guard
against kernel-to-user data leaks by avoiding speculative indirect
branches.
Requires a compiler with -mindirect-branch=thunk support for full
protection. The kernel may run slower.
If unsure, say N.
choice
prompt "Expoline default"
depends on EXPOLINE
default EXPOLINE_FULL
config EXPOLINE_OFF
bool "spectre_v2=off"
config EXPOLINE_MEDIUM
bool "spectre_v2=auto"
config EXPOLINE_FULL
bool "spectre_v2=on"
endchoice
endmenu
menu "Memory setup"

10
arch/s390/Makefile
View File

@ -81,6 +81,16 @@ ifeq ($(call cc-option-yn,-mwarn-dynamicstack),y)
cflags-$(CONFIG_WARN_DYNAMIC_STACK) += -mwarn-dynamicstack
endif
ifdef CONFIG_EXPOLINE
ifeq ($(call cc-option-yn,$(CC_FLAGS_MARCH) -mindirect-branch=thunk),y)
CC_FLAGS_EXPOLINE := -mindirect-branch=thunk
CC_FLAGS_EXPOLINE += -mfunction-return=thunk
CC_FLAGS_EXPOLINE += -mindirect-branch-table
export CC_FLAGS_EXPOLINE
cflags-y += $(CC_FLAGS_EXPOLINE)
endif
endif
ifdef CONFIG_FUNCTION_TRACER
# make use of hotpatch feature if the compiler supports it
cc_hotpatch := -mhotpatch=0,3

4
arch/s390/include/asm/lowcore.h
View File

@ -140,7 +140,9 @@ struct lowcore {
/* Per cpu primary space access list */
__u32 paste[16]; /* 0x0400 */
__u8 pad_0x04c0[0x0e00-0x0440]; /* 0x0440 */
/* br %r1 trampoline */
__u16 br_r1_trampoline; /* 0x0440 */
__u8 pad_0x0442[0x0e00-0x0442]; /* 0x0442 */
/*
* 0xe00 contains the address of the IPL Parameter Information

18
arch/s390/include/asm/nospec-branch.h 100644
View File

@ -0,0 +1,18 @@
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_S390_EXPOLINE_H
#define _ASM_S390_EXPOLINE_H
#ifndef __ASSEMBLY__
#include <linux/types.h>
extern int nospec_call_disable;
extern int nospec_return_disable;
void nospec_init_branches(void);
void nospec_call_revert(s32 *start, s32 *end);
void nospec_return_revert(s32 *start, s32 *end);
#endif /* __ASSEMBLY__ */
#endif /* _ASM_S390_EXPOLINE_H */

4
arch/s390/kernel/Makefile
View File

@ -29,6 +29,7 @@ UBSAN_SANITIZE_early.o := n
#
ifneq ($(CC_FLAGS_MARCH),-march=z900)
CFLAGS_REMOVE_als.o += $(CC_FLAGS_MARCH)
CFLAGS_REMOVE_als.o += $(CC_FLAGS_EXPOLINE)
CFLAGS_als.o += -march=z900
AFLAGS_REMOVE_head.o += $(CC_FLAGS_MARCH)
AFLAGS_head.o += -march=z900
@ -61,6 +62,9 @@ obj-y += entry.o reipl.o relocate_kernel.o kdebugfs.o alternative.o
extra-y += head.o head64.o vmlinux.lds
obj-$(CONFIG_EXPOLINE) += nospec-branch.o
CFLAGS_REMOVE_expoline.o += $(CC_FLAGS_EXPOLINE)
obj-$(CONFIG_MODULES) += module.o
obj-$(CONFIG_SMP) += smp.o
obj-$(CONFIG_SCHED_TOPOLOGY) += topology.o

113
arch/s390/kernel/entry.S
View File

@ -221,6 +221,68 @@ _PIF_WORK = (_PIF_PER_TRAP | _PIF_SYSCALL_RESTART)
.popsection
.endm
#ifdef CONFIG_EXPOLINE
.macro GEN_BR_THUNK name,reg,tmp
.section .text.\name,"axG",@progbits,\name,comdat
.globl \name
.hidden \name
.type \name,@function
\name:
.cfi_startproc
#ifdef CONFIG_HAVE_MARCH_Z10_FEATURES
exrl 0,0f
#else
larl \tmp,0f
ex 0,0(\tmp)
#endif
j .
0: br \reg
.cfi_endproc
.endm
GEN_BR_THUNK __s390x_indirect_jump_r1use_r9,%r9,%r1
GEN_BR_THUNK __s390x_indirect_jump_r1use_r14,%r14,%r1
GEN_BR_THUNK __s390x_indirect_jump_r11use_r14,%r14,%r11
.macro BASR_R14_R9
0: brasl %r14,__s390x_indirect_jump_r1use_r9
.pushsection .s390_indirect_branches,"a",@progbits
.long 0b-.
.popsection
.endm
.macro BR_R1USE_R14
0: jg __s390x_indirect_jump_r1use_r14
.pushsection .s390_indirect_branches,"a",@progbits
.long 0b-.
.popsection
.endm
.macro BR_R11USE_R14
0: jg __s390x_indirect_jump_r11use_r14
.pushsection .s390_indirect_branches,"a",@progbits
.long 0b-.
.popsection
.endm
#else /* CONFIG_EXPOLINE */
.macro BASR_R14_R9
basr %r14,%r9
.endm
.macro BR_R1USE_R14
br %r14
.endm
.macro BR_R11USE_R14
br %r14
.endm
#endif /* CONFIG_EXPOLINE */
.section .kprobes.text, "ax"
.Ldummy:
/*
@ -236,7 +298,7 @@ _PIF_WORK = (_PIF_PER_TRAP | _PIF_SYSCALL_RESTART)
ENTRY(__bpon)
.globl __bpon
BPON
br %r14
BR_R1USE_R14
/*
* Scheduler resume function, called by switch_to
@ -261,9 +323,9 @@ ENTRY(__switch_to)
mvc __LC_CURRENT_PID(4,%r0),__TASK_pid(%r3) # store pid of next
lmg %r6,%r15,__SF_GPRS(%r15) # load gprs of next task
TSTMSK __LC_MACHINE_FLAGS,MACHINE_FLAG_LPP
bzr %r14
jz 0f
.insn s,0xb2800000,__LC_LPP # set program parameter
br %r14
0: BR_R1USE_R14
.L__critical_start:
@ -330,7 +392,7 @@ sie_exit:
xgr %r5,%r5
lmg %r6,%r14,__SF_GPRS(%r15) # restore kernel registers
lg %r2,__SF_EMPTY+16(%r15) # return exit reason code
br %r14
BR_R1USE_R14
.Lsie_fault:
lghi %r14,-EFAULT
stg %r14,__SF_EMPTY+16(%r15) # set exit reason code
@ -389,7 +451,7 @@ ENTRY(system_call)
lgf %r9,0(%r8,%r10) # get system call add.
TSTMSK __TI_flags(%r12),_TIF_TRACE
jnz .Lsysc_tracesys
basr %r14,%r9 # call sys_xxxx
BASR_R14_R9 # call sys_xxxx
stg %r2,__PT_R2(%r11) # store return value
.Lsysc_return:
@ -566,7 +628,7 @@ ENTRY(system_call)
lmg %r3,%r7,__PT_R3(%r11)
stg %r7,STACK_FRAME_OVERHEAD(%r15)
lg %r2,__PT_ORIG_GPR2(%r11)
basr %r14,%r9 # call sys_xxx
BASR_R14_R9 # call sys_xxx
stg %r2,__PT_R2(%r11) # store return value
.Lsysc_tracenogo:
TSTMSK __TI_flags(%r12),_TIF_TRACE
@ -590,7 +652,7 @@ ENTRY(ret_from_fork)
lmg %r9,%r10,__PT_R9(%r11) # load gprs
ENTRY(kernel_thread_starter)
la %r2,0(%r10)
basr %r14,%r9
BASR_R14_R9
j .Lsysc_tracenogo
/*
@ -667,9 +729,9 @@ ENTRY(pgm_check_handler)
nill %r10,0x007f
sll %r10,2
je .Lpgm_return
lgf %r1,0(%r10,%r1) # load address of handler routine
lgf %r9,0(%r10,%r1) # load address of handler routine
lgr %r2,%r11 # pass pointer to pt_regs
basr %r14,%r1 # branch to interrupt-handler
BASR_R14_R9 # branch to interrupt-handler
.Lpgm_return:
LOCKDEP_SYS_EXIT
tm __PT_PSW+1(%r11),0x01 # returning to user ?
@ -979,7 +1041,7 @@ ENTRY(psw_idle)
stpt __TIMER_IDLE_ENTER(%r2)
.Lpsw_idle_lpsw:
lpswe __SF_EMPTY(%r15)
br %r14
BR_R1USE_R14
.Lpsw_idle_end:
/*
@ -993,7 +1055,7 @@ ENTRY(save_fpu_regs)
lg %r2,__LC_CURRENT
aghi %r2,__TASK_thread
TSTMSK __LC_CPU_FLAGS,_CIF_FPU
bor %r14
jo .Lsave_fpu_regs_exit
stfpc __THREAD_FPU_fpc(%r2)
lg %r3,__THREAD_FPU_regs(%r2)
TSTMSK __LC_MACHINE_FLAGS,MACHINE_FLAG_VX
@ -1020,7 +1082,8 @@ ENTRY(save_fpu_regs)
std 15,120(%r3)
.Lsave_fpu_regs_done:
oi __LC_CPU_FLAGS+7,_CIF_FPU
br %r14
.Lsave_fpu_regs_exit:
BR_R1USE_R14
.Lsave_fpu_regs_end:
EXPORT_SYMBOL(save_fpu_regs)
@ -1038,7 +1101,7 @@ load_fpu_regs:
lg %r4,__LC_CURRENT
aghi %r4,__TASK_thread
TSTMSK __LC_CPU_FLAGS,_CIF_FPU
bnor %r14
jno .Lload_fpu_regs_exit
lfpc __THREAD_FPU_fpc(%r4)
TSTMSK __LC_MACHINE_FLAGS,MACHINE_FLAG_VX
lg %r4,__THREAD_FPU_regs(%r4) # %r4 <- reg save area
@ -1065,7 +1128,8 @@ load_fpu_regs:
ld 15,120(%r4)
.Lload_fpu_regs_done:
ni __LC_CPU_FLAGS+7,255-_CIF_FPU
br %r14
.Lload_fpu_regs_exit:
BR_R1USE_R14
.Lload_fpu_regs_end:
.L__critical_end:
@ -1237,7 +1301,7 @@ cleanup_critical:
jl 0f
clg %r9,BASED(.Lcleanup_table+104) # .Lload_fpu_regs_end
jl .Lcleanup_load_fpu_regs
0: br %r14
0: BR_R11USE_R14
.align 8
.Lcleanup_table:
@ -1273,7 +1337,7 @@ cleanup_critical:
ni __SIE_PROG0C+3(%r9),0xfe # no longer in SIE
lctlg %c1,%c1,__LC_USER_ASCE # load primary asce
larl %r9,sie_exit # skip forward to sie_exit
br %r14
BR_R11USE_R14
#endif
.Lcleanup_system_call:
@ -1326,7 +1390,7 @@ cleanup_critical:
stg %r15,56(%r11) # r15 stack pointer
# set new psw address and exit
larl %r9,.Lsysc_do_svc
br %r14
BR_R11USE_R14
.Lcleanup_system_call_insn:
.quad system_call
.quad .Lsysc_stmg
@ -1338,7 +1402,7 @@ cleanup_critical:
.Lcleanup_sysc_tif:
larl %r9,.Lsysc_tif
br %r14
BR_R11USE_R14
.Lcleanup_sysc_restore:
# check if stpt has been executed
@ -1355,14 +1419,14 @@ cleanup_critical:
mvc 0(64,%r11),__PT_R8(%r9)
lmg %r0,%r7,__PT_R0(%r9)
1: lmg %r8,%r9,__LC_RETURN_PSW
br %r14
BR_R11USE_R14
.Lcleanup_sysc_restore_insn:
.quad .Lsysc_exit_timer
.quad .Lsysc_done - 4
.Lcleanup_io_tif:
larl %r9,.Lio_tif
br %r14
BR_R11USE_R14
.Lcleanup_io_restore:
# check if stpt has been executed
@ -1376,7 +1440,7 @@ cleanup_critical:
mvc 0(64,%r11),__PT_R8(%r9)
lmg %r0,%r7,__PT_R0(%r9)
1: lmg %r8,%r9,__LC_RETURN_PSW
br %r14
BR_R11USE_R14
.Lcleanup_io_restore_insn:
.quad .Lio_exit_timer
.quad .Lio_done - 4
@ -1429,17 +1493,17 @@ cleanup_critical:
# prepare return psw
nihh %r8,0xfcfd # clear irq & wait state bits
lg %r9,48(%r11) # return from psw_idle
br %r14
BR_R11USE_R14
.Lcleanup_idle_insn:
.quad .Lpsw_idle_lpsw
.Lcleanup_save_fpu_regs:
larl %r9,save_fpu_regs
br %r14
BR_R11USE_R14
.Lcleanup_load_fpu_regs:
larl %r9,load_fpu_regs
br %r14
BR_R11USE_R14
/*
* Integer constants
@ -1459,7 +1523,6 @@ cleanup_critical:
.Lsie_crit_mcck_length:
.quad .Lsie_skip - .Lsie_entry
#endif
.section .rodata, "a"
#define SYSCALL(esame,emu) .long esame
.globl sys_call_table

62
arch/s390/kernel/module.c
View File

@ -32,6 +32,8 @@
#include <linux/moduleloader.h>
#include <linux/bug.h>
#include <asm/alternative.h>
#include <asm/nospec-branch.h>
#include <asm/facility.h>
#if 0
#define DEBUGP printk
@ -169,7 +171,11 @@ int module_frob_arch_sections(Elf_Ehdr *hdr, Elf_Shdr *sechdrs,
me->arch.got_offset = me->core_layout.size;
me->core_layout.size += me->arch.got_size;
me->arch.plt_offset = me->core_layout.size;
me->core_layout.size += me->arch.plt_size;
if (me->arch.plt_size) {
if (IS_ENABLED(CONFIG_EXPOLINE) && !nospec_call_disable)
me->arch.plt_size += PLT_ENTRY_SIZE;
me->core_layout.size += me->arch.plt_size;
}
return 0;
}
@ -323,9 +329,21 @@ static int apply_rela(Elf_Rela *rela, Elf_Addr base, Elf_Sym *symtab,
unsigned int *ip;
ip = me->core_layout.base + me->arch.plt_offset +
info->plt_offset;
ip[0] = 0x0d10e310; /* basr 1,0; lg 1,10(1); br 1 */
ip[1] = 0x100a0004;
ip[2] = 0x07f10000;
ip[0] = 0x0d10e310; /* basr 1,0 */
ip[1] = 0x100a0004; /* lg 1,10(1) */
if (IS_ENABLED(CONFIG_EXPOLINE) &&
!nospec_call_disable) {
unsigned int *ij;
ij = me->core_layout.base +
me->arch.plt_offset +
me->arch.plt_size - PLT_ENTRY_SIZE;
ip[2] = 0xa7f40000 + /* j __jump_r1 */
(unsigned int)(u16)
(((unsigned long) ij - 8 -
(unsigned long) ip) / 2);
} else {
ip[2] = 0x07f10000; /* br %r1 */
}
ip[3] = (unsigned int) (val >> 32);
ip[4] = (unsigned int) val;
info->plt_initialized = 1;
@ -431,16 +449,42 @@ int module_finalize(const Elf_Ehdr *hdr,
struct module *me)
{
const Elf_Shdr *s;
char *secstrings;
char *secstrings, *secname;
void *aseg;
if (IS_ENABLED(CONFIG_EXPOLINE) &&
!nospec_call_disable && me->arch.plt_size) {
unsigned int *ij;
ij = me->core_layout.base + me->arch.plt_offset +
me->arch.plt_size - PLT_ENTRY_SIZE;
if (test_facility(35)) {
ij[0] = 0xc6000000; /* exrl %r0,.+10 */
ij[1] = 0x0005a7f4; /* j . */
ij[2] = 0x000007f1; /* br %r1 */
} else {
ij[0] = 0x44000000 | (unsigned int)
offsetof(struct lowcore, br_r1_trampoline);
ij[1] = 0xa7f40000; /* j . */
}
}
secstrings = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
for (s = sechdrs; s < sechdrs + hdr->e_shnum; s++) {
if (!strcmp(".altinstructions", secstrings + s->sh_name)) {
/* patch .altinstructions */
void *aseg = (void *)s->sh_addr;
aseg = (void *) s->sh_addr;
secname = secstrings + s->sh_name;
if (!strcmp(".altinstructions", secname))
/* patch .altinstructions */
apply_alternatives(aseg, aseg + s->sh_size);
}
if (IS_ENABLED(CONFIG_EXPOLINE) &&
(!strcmp(".nospec_call_table", secname)))
nospec_call_revert(aseg, aseg + s->sh_size);
if (IS_ENABLED(CONFIG_EXPOLINE) &&
(!strcmp(".nospec_return_table", secname)))
nospec_return_revert(aseg, aseg + s->sh_size);
}
jump_label_apply_nops(me);

101
arch/s390/kernel/nospec-branch.c 100644
View File

@ -0,0 +1,101 @@
// SPDX-License-Identifier: GPL-2.0
#include <linux/module.h>
#include <asm/facility.h>
#include <asm/nospec-branch.h>
int nospec_call_disable = IS_ENABLED(EXPOLINE_OFF);
int nospec_return_disable = !IS_ENABLED(EXPOLINE_FULL);
static int __init nospectre_v2_setup_early(char *str)
{
nospec_call_disable = 1;
nospec_return_disable = 1;
return 0;
}
early_param("nospectre_v2", nospectre_v2_setup_early);
static int __init spectre_v2_setup_early(char *str)
{
if (str && !strncmp(str, "on", 2)) {
nospec_call_disable = 0;
nospec_return_disable = 0;
}
if (str && !strncmp(str, "off", 3)) {
nospec_call_disable = 1;
nospec_return_disable = 1;
}
if (str && !strncmp(str, "auto", 4)) {
nospec_call_disable = 0;
nospec_return_disable = 1;
}
return 0;
}
early_param("spectre_v2", spectre_v2_setup_early);
static void __init_or_module __nospec_revert(s32 *start, s32 *end)
{
enum { BRCL_EXPOLINE, BRASL_EXPOLINE } type;
u8 *instr, *thunk, *br;
u8 insnbuf[6];
s32 *epo;
/* Second part of the instruction replace is always a nop */
memcpy(insnbuf + 2, (char[]) { 0x47, 0x00, 0x00, 0x00 }, 4);
for (epo = start; epo < end; epo++) {
instr = (u8 *) epo + *epo;
if (instr[0] == 0xc0 && (instr[1] & 0x0f) == 0x04)
type = BRCL_EXPOLINE; /* brcl instruction */
else if (instr[0] == 0xc0 && (instr[1] & 0x0f) == 0x05)
type = BRASL_EXPOLINE; /* brasl instruction */
else
continue;
thunk = instr + (*(int *)(instr + 2)) * 2;
if (thunk[0] == 0xc6 && thunk[1] == 0x00)
/* exrl %r0,<target-br> */
br = thunk + (*(int *)(thunk + 2)) * 2;
else if (thunk[0] == 0xc0 && (thunk[1] & 0x0f) == 0x00 &&
thunk[6] == 0x44 && thunk[7] == 0x00 &&
(thunk[8] & 0x0f) == 0x00 && thunk[9] == 0x00 &&
(thunk[1] & 0xf0) == (thunk[8] & 0xf0))
/* larl %rx,<target br> + ex %r0,0(%rx) */
br = thunk + (*(int *)(thunk + 2)) * 2;
else
continue;
if (br[0] != 0x07 || (br[1] & 0xf0) != 0xf0)
continue;
switch (type) {
case BRCL_EXPOLINE:
/* brcl to thunk, replace with br + nop */
insnbuf[0] = br[0];
insnbuf[1] = (instr[1] & 0xf0) | (br[1] & 0x0f);
break;
case BRASL_EXPOLINE:
/* brasl to thunk, replace with basr + nop */
insnbuf[0] = 0x0d;
insnbuf[1] = (instr[1] & 0xf0) | (br[1] & 0x0f);
break;
}
s390_kernel_write(instr, insnbuf, 6);
}
}
void __init_or_module nospec_call_revert(s32 *start, s32 *end)
{
if (nospec_call_disable)
__nospec_revert(start, end);
}
void __init_or_module nospec_return_revert(s32 *start, s32 *end)
{
if (nospec_return_disable)
__nospec_revert(start, end);
}
extern s32 __nospec_call_start[], __nospec_call_end[];
extern s32 __nospec_return_start[], __nospec_return_end[];
void __init nospec_init_branches(void)
{
nospec_call_revert(__nospec_call_start, __nospec_call_end);
nospec_return_revert(__nospec_return_start, __nospec_return_end);
}

4
arch/s390/kernel/setup.c
View File

@ -67,6 +67,7 @@
#include <asm/sysinfo.h>
#include <asm/numa.h>
#include <asm/alternative.h>
#include <asm/nospec-branch.h>
#include "entry.h"
/*
@ -384,6 +385,7 @@ static void __init setup_lowcore(void)
#ifdef CONFIG_SMP
lc->spinlock_lockval = arch_spin_lockval(0);
#endif
lc->br_r1_trampoline = 0x07f1; /* br %r1 */
set_prefix((u32)(unsigned long) lc);
lowcore_ptr[0] = lc;
@ -959,6 +961,8 @@ void __init setup_arch(char **cmdline_p)
set_preferred_console();
apply_alternative_instructions();
if (IS_ENABLED(CONFIG_EXPOLINE))
nospec_init_branches();
/* Setup zfcpdump support */
setup_zfcpdump();

1
arch/s390/kernel/smp.c
View File

@ -228,6 +228,7 @@ static int pcpu_alloc_lowcore(struct pcpu *pcpu, int cpu)
lc->mcesad = mcesa_origin | mcesa_bits;
lc->cpu_nr = cpu;
lc->spinlock_lockval = arch_spin_lockval(cpu);
lc->br_r1_trampoline = 0x07f1; /* br %r1 */
if (vdso_alloc_per_cpu(lc))
goto out;
lowcore_ptr[cpu] = lc;

14
arch/s390/kernel/vmlinux.lds.S
View File

@ -128,6 +128,20 @@ SECTIONS
*(.altinstr_replacement)
}
/*
* Table with the patch locations to undo expolines
*/
.nospec_call_table : {
__nospec_call_start = . ;
*(.s390_indirect*)
__nospec_call_end = . ;
}
.nospec_return_table : {
__nospec_return_start = . ;
*(.s390_return*)
__nospec_return_end = . ;
}
/* early.c uses stsi, which requires page aligned data. */
. = ALIGN(PAGE_SIZE);
INIT_DATA_SECTION(0x100)

2
drivers/s390/char/Makefile
View File

@ -17,6 +17,8 @@ CFLAGS_REMOVE_sclp_early_core.o += $(CC_FLAGS_MARCH)
CFLAGS_sclp_early_core.o += -march=z900
endif
CFLAGS_REMOVE_sclp_early_core.o += $(CC_FLAGS_EXPOLINE)
obj-y += ctrlchar.o keyboard.o defkeymap.o sclp.o sclp_rw.o sclp_quiesce.o \
sclp_cmd.o sclp_config.o sclp_cpi_sys.o sclp_ocf.o sclp_ctl.o \
sclp_early.o sclp_early_core.o