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s390/entry: Make pgm_check_handler() ready for lowcore relocation

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In preparation of having lowcore at different address than zero,
add the base register to all lowcore accesses in pgm_check_handler().

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 15:41:20 +02:00 committed by Vasily Gorbik
parent 86e08d64ee
commit 9e1e275fa2
2 changed files with 32 additions and 21 deletions
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6
arch/s390/include/asm/lowcore.h
View File

@ -244,5 +244,11 @@ static inline void set_prefix(__u32 address)
ALT_LOWCORE
.endm
.macro STMG_LC start, end, savearea
ALTERNATIVE "stmg \start, \end, \savearea", \
__stringify(stmg \start, \end, LOWCORE_ALT_ADDRESS + \savearea), \
ALT_LOWCORE
.endm
#endif /* __ASSEMBLY__ */
#endif /* _ASM_S390_LOWCORE_H */

47
arch/s390/kernel/entry.S
View File

@ -40,8 +40,11 @@ _LPP_OFFSET = __LC_LPP
ALTERNATIVE "nop", ".insn s,0xb2000000,\address", ALT_FACILITY(193)
.endm
.macro LPSWEY address,lpswe
ALTERNATIVE "b \lpswe; nopr", ".insn siy,0xeb0000000071,\address,0", ALT_FACILITY(193)
.macro LPSWEY address, lpswe
ALTERNATIVE_2 "b \lpswe;nopr", \
".insn siy,0xeb0000000071,\address,0", ALT_FACILITY_EARLY(193), \
__stringify(.insn siy,0xeb0000000071,LOWCORE_ALT_ADDRESS+\address,0), \
ALT_LOWCORE
.endm
.macro MBEAR reg, lowcore
@ -317,39 +320,40 @@ SYM_CODE_END(ret_from_fork)
*/
SYM_CODE_START(pgm_check_handler)
stpt __LC_SYS_ENTER_TIMER
STMG_LC %r8,%r15,__LC_SAVE_AREA_SYNC
GET_LC %r13
stpt __LC_SYS_ENTER_TIMER(%r13)
BPOFF
stmg %r8,%r15,__LC_SAVE_AREA_SYNC
lgr %r10,%r15
lmg %r8,%r9,__LC_PGM_OLD_PSW
lmg %r8,%r9,__LC_PGM_OLD_PSW(%r13)
tmhh %r8,0x0001 # coming from user space?
jno .Lpgm_skip_asce
lctlg %c1,%c1,__LC_KERNEL_ASCE
lctlg %c1,%c1,__LC_KERNEL_ASCE(%r13)
j 3f # -> fault in user space
.Lpgm_skip_asce:
1: tmhh %r8,0x4000 # PER bit set in old PSW ?
jnz 2f # -> enabled, can't be a double fault
tm __LC_PGM_ILC+3,0x80 # check for per exception
tm __LC_PGM_ILC+3(%r13),0x80 # check for per exception
jnz .Lpgm_svcper # -> single stepped svc
2: CHECK_STACK __LC_SAVE_AREA_SYNC,%r0
2: CHECK_STACK __LC_SAVE_AREA_SYNC,%r13
aghi %r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE)
# CHECK_VMAP_STACK branches to stack_overflow or 4f
CHECK_VMAP_STACK __LC_SAVE_AREA_SYNC,%r0,4f
3: lg %r15,__LC_KERNEL_STACK
CHECK_VMAP_STACK __LC_SAVE_AREA_SYNC,%r13,4f
3: lg %r15,__LC_KERNEL_STACK(%r13)
4: la %r11,STACK_FRAME_OVERHEAD(%r15)
xc __PT_FLAGS(8,%r11),__PT_FLAGS(%r11)
xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15)
stmg %r0,%r7,__PT_R0(%r11)
mvc __PT_R8(64,%r11),__LC_SAVE_AREA_SYNC
mvc __PT_LAST_BREAK(8,%r11),__LC_PGM_LAST_BREAK
mvc __PT_R8(64,%r11),__LC_SAVE_AREA_SYNC(%r13)
mvc __PT_LAST_BREAK(8,%r11),__LC_PGM_LAST_BREAK(%r13)
stctg %c1,%c1,__PT_CR1(%r11)
#if IS_ENABLED(CONFIG_KVM)
ltg %r12,__LC_GMAP
ltg %r12,__LC_GMAP(%r13)
jz 5f
clc __GMAP_ASCE(8,%r12), __PT_CR1(%r11)
jne 5f
BPENTER __SF_SIE_FLAGS(%r10),_TIF_ISOLATE_BP_GUEST
SIEEXIT __SF_SIE_CONTROL(%r10),%r0
SIEEXIT __SF_SIE_CONTROL(%r10),%r13
#endif
5: stmg %r8,%r9,__PT_PSW(%r11)
# clear user controlled registers to prevent speculative use
@ -365,11 +369,11 @@ SYM_CODE_START(pgm_check_handler)
tmhh %r8,0x0001 # returning to user space?
jno .Lpgm_exit_kernel
STACKLEAK_ERASE
lctlg %c1,%c1,__LC_USER_ASCE
lctlg %c1,%c1,__LC_USER_ASCE(%r13)
BPON
stpt __LC_EXIT_TIMER
stpt __LC_EXIT_TIMER(%r13)
.Lpgm_exit_kernel:
mvc __LC_RETURN_PSW(16),STACK_FRAME_OVERHEAD+__PT_PSW(%r15)
mvc __LC_RETURN_PSW(16,%r13),STACK_FRAME_OVERHEAD+__PT_PSW(%r15)
LBEAR STACK_FRAME_OVERHEAD+__PT_LAST_BREAK(%r15)
lmg %r0,%r15,STACK_FRAME_OVERHEAD+__PT_R0(%r15)
LPSWEY __LC_RETURN_PSW,__LC_RETURN_LPSWE
@ -378,11 +382,11 @@ SYM_CODE_START(pgm_check_handler)
# single stepped system call
#
.Lpgm_svcper:
mvc __LC_RETURN_PSW(8),__LC_SVC_NEW_PSW
mvc __LC_RETURN_PSW(8,%r13),__LC_SVC_NEW_PSW(%r13)
larl %r14,.Lsysc_per
stg %r14,__LC_RETURN_PSW+8
stg %r14,__LC_RETURN_PSW+8(%r13)
lghi %r14,1
LBEAR __LC_PGM_LAST_BREAK
LBEAR __LC_PGM_LAST_BREAK(%r13)
LPSWEY __LC_RETURN_PSW,__LC_RETURN_LPSWE # branch to .Lsysc_per
SYM_CODE_END(pgm_check_handler)
@ -596,7 +600,8 @@ SYM_CODE_END(restart_int_handler)
* Setup a pt_regs so that show_trace can provide a good call trace.
*/
SYM_CODE_START(stack_overflow)
lg %r15,__LC_NODAT_STACK # change to panic stack
GET_LC %r15
lg %r15,__LC_NODAT_STACK(%r15) # change to panic stack
la %r11,STACK_FRAME_OVERHEAD(%r15)
stmg %r0,%r7,__PT_R0(%r11)
stmg %r8,%r9,__PT_PSW(%r11)