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s390/entry: Add base register to MBEAR macro

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In preparation of having lowcore at different address than zero,
add the base register to MBEAR. No functional change, because
%r0 is passed to the macro.

Reviewed-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Sven Schnelle <svens@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
This commit is contained in:
Sven Schnelle 2024-07-22 15:41:17 +02:00 committed by Vasily Gorbik
parent 12184a4676
commit ca2f0a26c4
1 changed files with 5 additions and 4 deletions
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9
arch/s390/kernel/entry.S
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@ -44,8 +44,9 @@ _LPP_OFFSET = __LC_LPP
ALTERNATIVE "b \lpswe; nopr", ".insn siy,0xeb0000000071,\address,0", ALT_FACILITY(193)
.endm
.macro MBEAR reg
ALTERNATIVE "brcl 0,0", __stringify(mvc __PT_LAST_BREAK(8,\reg),__LC_LAST_BREAK), ALT_FACILITY(193)
.macro MBEAR reg, lowcore
ALTERNATIVE "brcl 0,0", __stringify(mvc __PT_LAST_BREAK(8,\reg),__LC_LAST_BREAK(\lowcore)),\
ALT_FACILITY(193)
.endm
.macro CHECK_STACK savearea
@ -282,7 +283,7 @@ SYM_CODE_START(system_call)
xgr %r11,%r11
la %r2,STACK_FRAME_OVERHEAD(%r15) # pointer to pt_regs
mvc __PT_R8(64,%r2),__LC_SAVE_AREA_SYNC
MBEAR %r2
MBEAR %r2,%r0
lgr %r3,%r14
brasl %r14,__do_syscall
STACKLEAK_ERASE
@ -424,7 +425,7 @@ SYM_CODE_START(\name)
xgr %r10,%r10
xc __PT_FLAGS(8,%r11),__PT_FLAGS(%r11)
mvc __PT_R8(64,%r11),__LC_SAVE_AREA_ASYNC
MBEAR %r11
MBEAR %r11,%r0
stmg %r8,%r9,__PT_PSW(%r11)
lgr %r2,%r11 # pass pointer to pt_regs
brasl %r14,\handler