Skip to content

L
linux
Commit 3999e97e authored by Martin Schwidefsky's avatar Martin Schwidefsky Committed by Linus Torvalds
Browse files
Options

[PATCH] s390: core changes 

s390 core changes:
 - Rework system call entry cleanup code to fix a potential asynchronous
   interrupt stack overflow if the user stack pointer happens to be in
   the same range as the asynchronous stack.
 - Replace broken schedule_timeout call with msleep.
 - Regenerate default configuration
Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 901408d3
Show whitespace changes
Inline Side-by-side
Showing with 242 additions and 297 deletions
arch/s390/defconfig
View file @ 3999e97e
......@@ -268,10 +268,12 @@ CONFIG_XFRM=y
# QoS and/or fair queueing
#
CONFIG_NET_SCHED=y
CONFIG_NET_SCH_CLK_JIFFIES=y
# CONFIG_NET_SCH_CLK_GETTIMEOFDAY is not set
# CONFIG_NET_SCH_CLK_CPU is not set
CONFIG_NET_SCH_CBQ=m
# CONFIG_NET_SCH_HTB is not set
# CONFIG_NET_SCH_HFSC is not set
CONFIG_NET_SCH_CSZ=m
CONFIG_NET_SCH_PRIO=m
CONFIG_NET_SCH_RED=m
CONFIG_NET_SCH_SFQ=m
......@@ -279,7 +281,7 @@ CONFIG_NET_SCH_TEQL=m
CONFIG_NET_SCH_TBF=m
CONFIG_NET_SCH_GRED=m
CONFIG_NET_SCH_DSMARK=m
# CONFIG_NET_SCH_DELAY is not set
# CONFIG_NET_SCH_NETEM is not set
# CONFIG_NET_SCH_INGRESS is not set
CONFIG_NET_QOS=y
CONFIG_NET_ESTIMATOR=y
......@@ -391,7 +393,8 @@ CONFIG_FS_MBCACHE=y
#
# DOS/FAT/NT Filesystems
#
# CONFIG_FAT_FS is not set
# CONFIG_MSDOS_FS is not set
# CONFIG_VFAT_FS is not set
# CONFIG_NTFS_FS is not set
#
......@@ -416,6 +419,7 @@ CONFIG_RAMFS=y
# CONFIG_BEFS_FS is not set
# CONFIG_BFS_FS is not set
# CONFIG_EFS_FS is not set
# CONFIG_JFFS2_COMPRESSION_OPTIONS is not set
# CONFIG_CRAMFS is not set
# CONFIG_VXFS_FS is not set
# CONFIG_HPFS_FS is not set
......@@ -520,6 +524,6 @@ CONFIG_CRYPTO=y
#
# Library routines
#
# CONFIG_CRC16 is not set
# CONFIG_CRC_CCITT is not set
# CONFIG_CRC32 is not set
# CONFIG_LIBCRC32C is not set
arch/s390/kernel/entry.S
View file @ 3999e97e
......@@ -62,109 +62,55 @@ _TIF_WORK_INT = (_TIF_SIGPENDING | _TIF_NEED_RESCHED)
* R15 - kernel stack pointer
*/
.macro SAVE_ALL_BASE psworg,savearea,sync
.macro SAVE_ALL_BASE savearea
stm %r12,%r15,\savearea
l %r13,__LC_SVC_NEW_PSW+4 # load &system_call to %r13
.endm
.macro CLEANUP_SAVE_ALL_BASE psworg,savearea,sync
l %r1,SP_PSW+4(%r15)
cli 1(%r1),0xcf
bne BASED(0f)
mvc \savearea(16),SP_R12(%r15)
0: st %r13,SP_R13(%r15)
.endm
.macro SAVE_ALL psworg,savearea,sync
la %r12,\psworg
.if \sync
tm \psworg+1,0x01 # test problem state bit
bz BASED(1f) # skip stack setup save
bz BASED(2f) # skip stack setup save
l %r15,__LC_KERNEL_STACK # problem state -> load ksp
.else
tm \psworg+1,0x01 # test problem state bit
bnz BASED(0f) # from user -> load async stack
l %r14,__LC_ASYNC_STACK # are we already on the async stack ?
bnz BASED(1f) # from user -> load async stack
clc \psworg+4(4),BASED(.Lcritical_end)
bhe BASED(0f)
clc \psworg+4(4),BASED(.Lcritical_start)
bl BASED(0f)
l %r14,BASED(.Lcleanup_critical)
basr %r14,%r14
tm 0(%r12),0x01 # retest problem state after cleanup
bnz BASED(1f)
0: l %r14,__LC_ASYNC_STACK # are we already on the async stack ?
slr %r14,%r15
sra %r14,13
be BASED(1f)
0: l %r15,__LC_ASYNC_STACK
be BASED(2f)
1: l %r15,__LC_ASYNC_STACK
.endif
1: s %r15,BASED(.Lc_spsize) # make room for registers & psw
l %r14,BASED(.L\psworg)
slr %r12,%r12
icm %r14,12,__LC_SVC_ILC
stm %r0,%r11,SP_R0(%r15) # store gprs 0-12 to kernel stack
2: s %r15,BASED(.Lc_spsize) # make room for registers & psw
mvc SP_PSW(8,%r15),0(%r12) # move user PSW to stack
la %r12,\psworg
st %r2,SP_ORIG_R2(%r15) # store original content of gpr 2
mvc SP_R12(16,%r15),\savearea # move R13-R15 to stack
mvc SP_PSW(8,%r15),\psworg # move user PSW to stack
st %r14,SP_ILC(%r15)
icm %r12,12,__LC_SVC_ILC
stm %r0,%r11,SP_R0(%r15) # store gprs %r0-%r11 to kernel stack
st %r12,SP_ILC(%r15)
mvc SP_R12(16,%r15),\savearea # move %r12-%r15 to stack
la %r12,0
st %r12,0(%r15) # clear back chain
.endm
.macro CLEANUP_SAVE_ALL psworg,savearea,sync
l %r1,\savearea+12
.if \sync
tm \psworg+1,0x01
bz BASED(1f)
l %r1,__LC_KERNEL_STACK
.else
tm \psworg+1,0x01
bnz BASED(0f)
l %r0,__LC_ASYNC_STACK
slr %r0,%r1
sra %r0,13
bz BASED(1f)
0: l %r1,__LC_ASYNC_STACK
.endif
1: s %r1,BASED(.Lc_spsize)
st %r1,SP_R15(%r15)
l %r0,BASED(.L\psworg)
xc SP_R12(4,%r15),SP_R12(%r15)
icm %r0,12,__LC_SVC_ILC
st %r0,SP_R14(%r15)
mvc SP_R0(48,%r1),SP_R0(%r15)
mvc SP_ORIG_R2(4,%r1),SP_R2(%r15)
mvc SP_R12(16,%r1),\savearea
mvc SP_PSW(8,%r1),\psworg
st %r0,SP_ILC(%r1)
xc 0(4,%r1),0(%r1)
.endm
.macro RESTORE_ALL # system exit macro
.macro RESTORE_ALL sync
mvc __LC_RETURN_PSW(8),SP_PSW(%r15) # move user PSW to lowcore
.if !\sync
ni __LC_RETURN_PSW+1,0xfd # clear wait state bit
.endif
lm %r0,%r15,SP_R0(%r15) # load gprs 0-15 of user
lpsw __LC_RETURN_PSW # back to caller
.endm
.macro CLEANUP_RESTORE_ALL
l %r1,SP_PSW+4(%r15)
cli 0(%r1),0x82
bne BASED(0f)
mvc SP_PSW(8,%r15),__LC_RETURN_PSW
b BASED(1f)
0: l %r1,SP_R15(%r15)
mvc SP_PSW(8,%r15),SP_PSW(%r1)
mvc SP_R0(64,%r15),SP_R0(%r1)
1:
.endm
.macro GET_THREAD_INFO
l %r9,__LC_THREAD_INFO
.endm
.macro CHECK_CRITICAL
tm SP_PSW+1(%r15),0x01 # test problem state bit
bnz BASED(0f) # from user -> not critical
clc SP_PSW+4(4,%r15),BASED(.Lcritical_end)
bnl BASED(0f)
clc SP_PSW+4(4,%r15),BASED(.Lcritical_start)
bl BASED(0f)
l %r1,BASED(.Lcleanup_critical)
basr %r14,%r1
0:
.endm
/*
* Scheduler resume function, called by switch_to
* gpr2 = (task_struct *) prev
......@@ -226,12 +172,11 @@ __critical_start:
.globl system_call
system_call:
SAVE_ALL_BASE __LC_SVC_OLD_PSW,__LC_SAVE_AREA,1
SAVE_ALL_BASE __LC_SAVE_AREA
SAVE_ALL __LC_SVC_OLD_PSW,__LC_SAVE_AREA,1
lh %r7,0x8a # get svc number from lowcore
sysc_enter:
GET_THREAD_INFO # load pointer to task_struct to R9
sysc_do_svc:
l %r9,__LC_THREAD_INFO # load pointer to thread_info struct
sla %r7,2 # *4 and test for svc 0
bnz BASED(sysc_nr_ok) # svc number > 0
# svc 0: system call number in %r1
......@@ -256,13 +201,12 @@ sysc_return:
tm __TI_flags+3(%r9),_TIF_WORK_SVC
bnz BASED(sysc_work) # there is work to do (signals etc.)
sysc_leave:
RESTORE_ALL
RESTORE_ALL 1
#
# recheck if there is more work to do
#
sysc_work_loop:
GET_THREAD_INFO # load pointer to task_struct to R9
tm __TI_flags+3(%r9),_TIF_WORK_SVC
bz BASED(sysc_leave) # there is no work to do
#
......@@ -359,7 +303,7 @@ sysc_tracenogo:
.globl ret_from_fork
ret_from_fork:
l %r13,__LC_SVC_NEW_PSW+4
GET_THREAD_INFO # load pointer to task_struct to R9
l %r9,__LC_THREAD_INFO # load pointer to thread_info struct
l %r1,BASED(.Lschedtail)
basr %r14,%r1
stosm 24(%r15),0x03 # reenable interrupts
......@@ -455,17 +399,17 @@ pgm_check_handler:
* we just ignore the PER event (FIXME: is there anything we have to do
* for LPSW?).
*/
SAVE_ALL_BASE __LC_PGM_OLD_PSW,__LC_SAVE_AREA,1
SAVE_ALL_BASE __LC_SAVE_AREA
tm __LC_PGM_INT_CODE+1,0x80 # check whether we got a per exception
bnz BASED(pgm_per) # got per exception -> special case
SAVE_ALL __LC_PGM_OLD_PSW,__LC_SAVE_AREA,1
l %r9,__LC_THREAD_INFO # load pointer to thread_info struct
l %r3,__LC_PGM_ILC # load program interruption code
la %r8,0x7f
nr %r8,%r3
pgm_do_call:
l %r7,BASED(.Ljump_table)
sll %r8,2
GET_THREAD_INFO
l %r7,0(%r8,%r7) # load address of handler routine
la %r2,SP_PTREGS(%r15) # address of register-save area
la %r14,BASED(sysc_return)
......@@ -481,7 +425,7 @@ pgm_per:
clc __LC_PGM_OLD_PSW(8),__LC_SVC_NEW_PSW
be BASED(pgm_svcper)
# no interesting special case, ignore PER event
lm %r13,%r15,__LC_SAVE_AREA
lm %r12,%r15,__LC_SAVE_AREA
lpsw 0x28
#
......@@ -489,7 +433,7 @@ pgm_per:
#
pgm_per_std:
SAVE_ALL __LC_PGM_OLD_PSW,__LC_SAVE_AREA,1
GET_THREAD_INFO
l %r9,__LC_THREAD_INFO # load pointer to thread_info struct
l %r1,__TI_task(%r9)
mvc __THREAD_per+__PER_atmid(2,%r1),__LC_PER_ATMID
mvc __THREAD_per+__PER_address(4,%r1),__LC_PER_ADDRESS
......@@ -507,7 +451,7 @@ pgm_per_std:
pgm_svcper:
SAVE_ALL __LC_SVC_OLD_PSW,__LC_SAVE_AREA,1
lh %r7,0x8a # get svc number from lowcore
GET_THREAD_INFO # load pointer to task_struct to R9
l %r9,__LC_THREAD_INFO # load pointer to thread_info struct
l %r1,__TI_task(%r9)
mvc __THREAD_per+__PER_atmid(2,%r1),__LC_PER_ATMID
mvc __THREAD_per+__PER_address(4,%r1),__LC_PER_ADDRESS
......@@ -522,11 +466,10 @@ pgm_svcper:
.globl io_int_handler
io_int_handler:
SAVE_ALL_BASE __LC_IO_OLD_PSW,__LC_SAVE_AREA+16,0
SAVE_ALL __LC_IO_OLD_PSW,__LC_SAVE_AREA+16,0
stck __LC_INT_CLOCK
CHECK_CRITICAL
GET_THREAD_INFO # load pointer to task_struct to R9
SAVE_ALL_BASE __LC_SAVE_AREA+16
SAVE_ALL __LC_IO_OLD_PSW,__LC_SAVE_AREA+16,0
l %r9,__LC_THREAD_INFO # load pointer to thread_info struct
l %r1,BASED(.Ldo_IRQ) # load address of do_IRQ
la %r2,SP_PTREGS(%r15) # address of register-save area
basr %r14,%r1 # branch to standard irq handler
......@@ -541,7 +484,7 @@ io_return:
tm __TI_flags+3(%r9),_TIF_WORK_INT
bnz BASED(io_work) # there is work to do (signals etc.)
io_leave:
RESTORE_ALL
RESTORE_ALL 0
#ifdef CONFIG_PREEMPT
io_preempt:
......@@ -560,7 +503,6 @@ io_resume_loop:
l %r1,BASED(.Lschedule)
basr %r14,%r1 # call schedule
stnsm 24(%r15),0xfc # disable I/O and ext. interrupts
GET_THREAD_INFO # load pointer to task_struct to R9
xc __TI_precount(4,%r9),__TI_precount(%r9)
b BASED(io_resume_loop)
#endif
......@@ -593,7 +535,6 @@ io_reschedule:
stosm 24(%r15),0x03 # reenable interrupts
basr %r14,%r1 # call scheduler
stnsm 24(%r15),0xfc # disable I/O and ext. interrupts
GET_THREAD_INFO # load pointer to task_struct to R9
tm __TI_flags+3(%r9),_TIF_WORK_INT
bz BASED(io_leave) # there is no work to do
b BASED(io_work_loop)
......@@ -616,11 +557,10 @@ io_sigpending:
.globl ext_int_handler
ext_int_handler:
SAVE_ALL_BASE __LC_EXT_OLD_PSW,__LC_SAVE_AREA+16,0
SAVE_ALL __LC_EXT_OLD_PSW,__LC_SAVE_AREA+16,0
stck __LC_INT_CLOCK
CHECK_CRITICAL
GET_THREAD_INFO # load pointer to task_struct to R9
SAVE_ALL_BASE __LC_SAVE_AREA+16
SAVE_ALL __LC_EXT_OLD_PSW,__LC_SAVE_AREA+16,0
l %r9,__LC_THREAD_INFO # load pointer to thread_info struct
la %r2,SP_PTREGS(%r15) # address of register-save area
lh %r3,__LC_EXT_INT_CODE # get interruption code
l %r1,BASED(.Ldo_extint)
......@@ -633,12 +573,12 @@ ext_int_handler:
.globl mcck_int_handler
mcck_int_handler:
SAVE_ALL_BASE __LC_MCK_OLD_PSW,__LC_SAVE_AREA+32,0
SAVE_ALL_BASE __LC_SAVE_AREA+32
SAVE_ALL __LC_MCK_OLD_PSW,__LC_SAVE_AREA+32,0
l %r1,BASED(.Ls390_mcck)
basr %r14,%r1 # call machine check handler
mcck_return:
RESTORE_ALL
RESTORE_ALL 0
#ifdef CONFIG_SMP
/*
......@@ -671,50 +611,68 @@ restart_crash:
restart_go:
#endif
cleanup_table:
.long system_call, sysc_enter, cleanup_sysc_enter
.long sysc_return, sysc_leave, cleanup_sysc_return
.long sysc_leave, sysc_work_loop, cleanup_sysc_leave
.long sysc_work_loop, sysc_reschedule, cleanup_sysc_return
cleanup_table_entries=(.-cleanup_table) / 12
cleanup_table_system_call:
.long system_call + 0x80000000, sysc_do_svc + 0x80000000
cleanup_table_sysc_return:
.long sysc_return + 0x80000000, sysc_leave + 0x80000000
cleanup_table_sysc_leave:
.long sysc_leave + 0x80000000, sysc_work_loop + 0x80000000
cleanup_table_sysc_work_loop:
.long sysc_work_loop + 0x80000000, sysc_reschedule + 0x80000000
cleanup_critical:
lhi %r0,cleanup_table_entries
la %r1,BASED(cleanup_table)
l %r2,SP_PSW+4(%r15)
la %r2,0(%r2)
cleanup_loop:
cl %r2,0(%r1)
bl BASED(cleanup_cont)
cl %r2,4(%r1)
bl BASED(cleanup_found)
cleanup_cont:
la %r1,12(%r1)
bct %r0,BASED(cleanup_loop)
clc 4(4,%r12),BASED(cleanup_table_system_call)
bl BASED(0f)
clc 4(4,%r12),BASED(cleanup_table_system_call+4)
bl BASED(cleanup_system_call)
0:
clc 4(4,%r12),BASED(cleanup_table_sysc_return)
bl BASED(0f)
clc 4(4,%r12),BASED(cleanup_table_sysc_return+4)
bl BASED(cleanup_sysc_return)
0:
clc 4(4,%r12),BASED(cleanup_table_sysc_leave)
bl BASED(0f)
clc 4(4,%r12),BASED(cleanup_table_sysc_leave+4)
bl BASED(cleanup_sysc_leave)
0:
clc 4(4,%r12),BASED(cleanup_table_sysc_work_loop)
bl BASED(0f)
clc 4(4,%r12),BASED(cleanup_table_sysc_work_loop+4)
bl BASED(cleanup_sysc_leave)
0:
br %r14
cleanup_found:
l %r1,8(%r1)
br %r1
cleanup_sysc_enter:
CLEANUP_SAVE_ALL_BASE __LC_SVC_OLD_PSW,__LC_SAVE_AREA,1
CLEANUP_SAVE_ALL __LC_SVC_OLD_PSW,__LC_SAVE_AREA,1
lh %r0,0x8a
st %r0,SP_R7(%r15)
la %r1,BASED(sysc_enter)
o %r1,BASED(.Lamode)
st %r1,SP_PSW+4(%r15)
cleanup_system_call:
mvc __LC_RETURN_PSW(4),0(%r12)
clc 4(4,%r12),BASED(cleanup_table_system_call)
bne BASED(0f)
mvc __LC_SAVE_AREA(16),__LC_SAVE_AREA+16
0: st %r13,__LC_SAVE_AREA+20
SAVE_ALL __LC_SVC_OLD_PSW,__LC_SAVE_AREA,1
st %r15,__LC_SAVE_AREA+28
lh %r7,0x8a
mvc __LC_RETURN_PSW+4(4),BASED(cleanup_table_system_call+4)
la %r12,__LC_RETURN_PSW
br %r14
cleanup_sysc_return:
la %r1,BASED(sysc_return)
o %r1,BASED(.Lamode)
st %r1,SP_PSW+4(%r15)
mvc __LC_RETURN_PSW(4),0(%r12)
mvc __LC_RETURN_PSW+4(4),BASED(cleanup_table_sysc_return)
la %r12,__LC_RETURN_PSW
br %r14
cleanup_sysc_leave:
CLEANUP_RESTORE_ALL
clc 4(4,%r12),BASED(cleanup_sysc_leave_lpsw)
be BASED(0f)
mvc __LC_RETURN_PSW(8),SP_PSW(%r15)
mvc __LC_SAVE_AREA+16(16),SP_R12(%r15)
lm %r0,%r11,SP_R0(%r15)
l %r15,SP_R15(%r15)
0: la %r12,__LC_RETURN_PSW
br %r14
cleanup_sysc_leave_lpsw:
.long sysc_leave + 10 + 0x80000000
/*
* Integer constants
......@@ -724,12 +682,11 @@ cleanup_sysc_leave:
.Lc_overhead: .long STACK_FRAME_OVERHEAD
.Lc_pactive: .long PREEMPT_ACTIVE
.Lnr_syscalls: .long NR_syscalls
.L0x018: .long 0x018
.L0x020: .long 0x020
.L0x028: .long 0x028
.L0x030: .long 0x030
.L0x038: .long 0x038
.Lamode: .long 0x80000000
.L0x018: .short 0x018
.L0x020: .short 0x020
.L0x028: .short 0x028
.L0x030: .short 0x030
.L0x038: .short 0x038
/*
* Symbol constants
......
arch/s390/kernel/entry64.S
View file @ 3999e97e
......@@ -52,6 +52,8 @@ _TIF_WORK_SVC = (_TIF_SIGPENDING | _TIF_NEED_RESCHED | \
_TIF_RESTART_SVC | _TIF_SINGLE_STEP )
_TIF_WORK_INT = (_TIF_SIGPENDING | _TIF_NEED_RESCHED)
#define BASED(name) name-system_call(%r13)
/*
* Register usage in interrupt handlers:
* R9 - pointer to current task structure
......@@ -60,101 +62,54 @@ _TIF_WORK_INT = (_TIF_SIGPENDING | _TIF_NEED_RESCHED)
* R15 - kernel stack pointer
*/
.macro SAVE_ALL_BASE savearea
stmg %r12,%r15,\savearea
larl %r13,system_call
.endm
.macro SAVE_ALL psworg,savearea,sync
stmg %r13,%r15,\savearea
la %r12,\psworg
.if \sync
tm \psworg+1,0x01 # test problem state bit
jz 1f # skip stack setup save
jz 2f # skip stack setup save
lg %r15,__LC_KERNEL_STACK # problem state -> load ksp
.else
tm \psworg+1,0x01 # test problem state bit
jnz 0f # from user -> load kernel stack
lg %r14,__LC_ASYNC_STACK # are we already on the async. stack ?
jnz 1f # from user -> load kernel stack
clc \psworg+8(8),BASED(.Lcritical_end)
jhe 0f
clc \psworg+8(8),BASED(.Lcritical_start)
jl 0f
brasl %r14,cleanup_critical
tm 0(%r12),0x01 # retest problem state after cleanup
jnz 1f
0: lg %r14,__LC_ASYNC_STACK # are we already on the async. stack ?
slgr %r14,%r15
srag %r14,%r14,14
jz 1f
0: lg %r15,__LC_ASYNC_STACK # load async stack
jz 2f
1: lg %r15,__LC_ASYNC_STACK # load async stack
.endif
1: aghi %r15,-SP_SIZE # make room for registers & psw
lghi %r14,\psworg
slgr %r13,%r13
icm %r14,12,__LC_SVC_ILC
stmg %r0,%r12,SP_R0(%r15) # store gprs 0-13 to kernel stack
2: aghi %r15,-SP_SIZE # make room for registers & psw
mvc SP_PSW(16,%r15),0(%r12) # move user PSW to stack
la %r12,\psworg
stg %r2,SP_ORIG_R2(%r15) # store original content of gpr 2
mvc SP_R13(24,%r15),\savearea # move r13, r14 and r15 to stack
mvc SP_PSW(16,%r15),\psworg # move user PSW to stack
st %r14,SP_ILC(%r15)
stg %r13,0(%r15)
.endm
.macro CLEANUP_SAVE_ALL psworg,savearea,sync
lg %r1,SP_PSW+8(%r15)
cli 1(%r1),0xdf
jne 2f
mvc \savearea(24),SP_R13(%r15)
2: lg %r1,\savearea+16
.if \sync
tm \psworg+1,0x01
jz 1f
lg %r1,__LC_KERNEL_STACK
.else
tm \psworg+1,0x01
jnz 0f
lg %r0,__LC_ASYNC_STACK
slgr %r0,%r1
srag %r0,%r0,14
jz 1f
0: lg %r1,__LC_ASYNC_STACK
.endif
1: aghi %r1,-SP_SIZE
stg %r1,SP_R15(%r15)
lghi %r0,\psworg
xc SP_R13(8,%r15),SP_R13(%r15)
icm %r0,12,__LC_SVC_ILC
stg %r0,SP_R14(%r15)
mvc SP_R0(104,%r1),SP_R0(%r15)
mvc SP_ORIG_R2(8,%r1),SP_R2(%r15)
mvc SP_R13(24,%r1),\savearea
mvc SP_PSW(16,%r1),\psworg
st %r0,SP_ILC(%r1)
xc 0(8,%r1),0(%r1)
icm %r12,12,__LC_SVC_ILC
stmg %r0,%r11,SP_R0(%r15) # store gprs %r0-%r11 to kernel stack
st %r12,SP_ILC(%r15)
mvc SP_R12(32,%r15),\savearea # move %r12-%r15 to stack
la %r12,0
stg %r12,0(%r15)
.endm
.macro RESTORE_ALL # system exit macro
.macro RESTORE_ALL sync
mvc __LC_RETURN_PSW(16),SP_PSW(%r15) # move user PSW to lowcore
.if !\sync
ni __LC_RETURN_PSW+1,0xfd # clear wait state bit
.endif
lmg %r0,%r15,SP_R0(%r15) # load gprs 0-15 of user
lpswe __LC_RETURN_PSW # back to caller
.endm
.macro CLEANUP_RESTORE_ALL
lg %r1,SP_PSW+8(%r15)
cli 0(%r1),0xb2
jne 0f
mvc SP_PSW(16,%r15),__LC_RETURN_PSW
j 1f
0: lg %r1,SP_R15(%r15)
mvc SP_PSW(16,%r15),SP_PSW(%r1)
mvc SP_R0(128,%r15),SP_R0(%r1)
1:
.endm
.macro GET_THREAD_INFO
lg %r9,__LC_THREAD_INFO # load pointer to thread_info struct
.endm
.macro CHECK_CRITICAL
tm SP_PSW+1(%r15),0x01 # test problem state bit
jnz 0f # from user -> not critical
larl %r1,.Lcritical_start
clc SP_PSW+8(8,%r15),8(%r1) # compare ip with __critical_end
jnl 0f
clc SP_PSW+8(8,%r15),0(%r1) # compare ip with __critical_start
jl 0f
brasl %r14,cleanup_critical
0:
.endm
/*
* Scheduler resume function, called by switch_to
* gpr2 = (task_struct *) prev
......@@ -211,16 +166,15 @@ __critical_start:
.globl system_call
system_call:
SAVE_ALL_BASE __LC_SAVE_AREA
SAVE_ALL __LC_SVC_OLD_PSW,__LC_SAVE_AREA,1
llgh %r7,__LC_SVC_INT_CODE # get svc number from lowcore
sysc_enter:
GET_THREAD_INFO # load pointer to task_struct to R9
sysc_do_svc:
lg %r9,__LC_THREAD_INFO # load pointer to thread_info struct
slag %r7,%r7,2 # *4 and test for svc 0
jnz sysc_nr_ok
# svc 0: system call number in %r1
lghi %r0,NR_syscalls
clr %r1,%r0
cl %r1,BASED(.Lnr_syscalls)
jnl sysc_nr_ok
lgfr %r7,%r1 # clear high word in r1
slag %r7,%r7,2 # svc 0: system call number in %r1
......@@ -248,13 +202,12 @@ sysc_return:
tm __TI_flags+7(%r9),_TIF_WORK_SVC
jnz sysc_work # there is work to do (signals etc.)
sysc_leave:
RESTORE_ALL
RESTORE_ALL 1
#
# recheck if there is more work to do
#
sysc_work_loop:
GET_THREAD_INFO # load pointer to task_struct to R9
tm __TI_flags+7(%r9),_TIF_WORK_SVC
jz sysc_leave # there is no work to do
#
......@@ -349,7 +302,8 @@ sysc_tracenogo:
#
.globl ret_from_fork
ret_from_fork:
GET_THREAD_INFO # load pointer to task_struct to R9
lg %r13,__LC_SVC_NEW_PSW+8
lg %r9,__LC_THREAD_INFO # load pointer to thread_info struct
brasl %r14,schedule_tail
stosm 24(%r15),0x03 # reenable interrupts
j sysc_return
......@@ -492,15 +446,16 @@ pgm_check_handler:
* we just ignore the PER event (FIXME: is there anything we have to do
* for LPSW?).
*/
SAVE_ALL_BASE __LC_SAVE_AREA
tm __LC_PGM_INT_CODE+1,0x80 # check whether we got a per exception
jnz pgm_per # got per exception -> special case
SAVE_ALL __LC_PGM_OLD_PSW,__LC_SAVE_AREA,1
lg %r9,__LC_THREAD_INFO # load pointer to thread_info struct
lgf %r3,__LC_PGM_ILC # load program interruption code
lghi %r8,0x7f
ngr %r8,%r3
pgm_do_call:
sll %r8,3
GET_THREAD_INFO
larl %r1,pgm_check_table
lg %r1,0(%r8,%r1) # load address of handler routine
la %r2,SP_PTREGS(%r15) # address of register-save area
......@@ -517,6 +472,7 @@ pgm_per:
clc __LC_PGM_OLD_PSW(16),__LC_SVC_NEW_PSW
je pgm_svcper
# no interesting special case, ignore PER event
lmg %r12,%r15,__LC_SAVE_AREA
lpswe __LC_PGM_OLD_PSW
#
......@@ -524,7 +480,7 @@ pgm_per:
#
pgm_per_std:
SAVE_ALL __LC_PGM_OLD_PSW,__LC_SAVE_AREA,1
GET_THREAD_INFO
lg %r9,__LC_THREAD_INFO # load pointer to thread_info struct
lg %r1,__TI_task(%r9)
mvc __THREAD_per+__PER_atmid(2,%r1),__LC_PER_ATMID
mvc __THREAD_per+__PER_address(8,%r1),__LC_PER_ADDRESS
......@@ -542,7 +498,7 @@ pgm_per_std:
pgm_svcper:
SAVE_ALL __LC_SVC_OLD_PSW,__LC_SAVE_AREA,1
llgh %r7,__LC_SVC_INT_CODE # get svc number from lowcore
GET_THREAD_INFO # load pointer to task_struct to R9
lg %r9,__LC_THREAD_INFO # load pointer to thread_info struct
lg %r1,__TI_task(%r9)
mvc __THREAD_per+__PER_atmid(2,%r1),__LC_PER_ATMID
mvc __THREAD_per+__PER_address(8,%r1),__LC_PER_ADDRESS
......@@ -556,10 +512,10 @@ pgm_svcper:
*/
.globl io_int_handler
io_int_handler:
SAVE_ALL __LC_IO_OLD_PSW,__LC_SAVE_AREA+32,0
stck __LC_INT_CLOCK
CHECK_CRITICAL
GET_THREAD_INFO # load pointer to task_struct to R9
SAVE_ALL_BASE __LC_SAVE_AREA+32
SAVE_ALL __LC_IO_OLD_PSW,__LC_SAVE_AREA+32,0
lg %r9,__LC_THREAD_INFO # load pointer to thread_info struct
la %r2,SP_PTREGS(%r15) # address of register-save area
brasl %r14,do_IRQ # call standard irq handler
......@@ -573,7 +529,7 @@ io_return:
tm __TI_flags+7(%r9),_TIF_WORK_INT
jnz io_work # there is work to do (signals etc.)
io_leave:
RESTORE_ALL
RESTORE_ALL 0
#ifdef CONFIG_PREEMPT
io_preempt:
......@@ -593,7 +549,6 @@ io_resume_loop:
stosm 48(%r15),0x03 # reenable interrupts
brasl %r14,schedule # call schedule
stnsm 48(%r15),0xfc # disable I/O and ext. interrupts
GET_THREAD_INFO # load pointer to task_struct to R9
xc __TI_precount(4,%r9),__TI_precount(%r9)
j io_resume_loop
#endif
......@@ -625,7 +580,6 @@ io_reschedule:
stosm 48(%r15),0x03 # reenable interrupts
brasl %r14,schedule # call scheduler
stnsm 48(%r15),0xfc # disable I/O and ext. interrupts
GET_THREAD_INFO # load pointer to task_struct to R9
tm __TI_flags+7(%r9),_TIF_WORK_INT
jz io_leave # there is no work to do
j io_work_loop
......@@ -646,10 +600,10 @@ io_sigpending:
*/
.globl ext_int_handler
ext_int_handler:
SAVE_ALL __LC_EXT_OLD_PSW,__LC_SAVE_AREA+32,0
CHECK_CRITICAL
GET_THREAD_INFO # load pointer to task_struct to R9
stck __LC_INT_CLOCK
SAVE_ALL_BASE __LC_SAVE_AREA+32
SAVE_ALL __LC_EXT_OLD_PSW,__LC_SAVE_AREA+32,0
lg %r9,__LC_THREAD_INFO # load pointer to thread_info struct
la %r2,SP_PTREGS(%r15) # address of register-save area
llgh %r3,__LC_EXT_INT_CODE # get interruption code
brasl %r14,do_extint
......@@ -660,10 +614,11 @@ ext_int_handler:
*/
.globl mcck_int_handler
mcck_int_handler:
SAVE_ALL_BASE __LC_SAVE_AREA+64
SAVE_ALL __LC_MCK_OLD_PSW,__LC_SAVE_AREA+64,0
brasl %r14,s390_do_machine_check
mcck_return:
RESTORE_ALL
RESTORE_ALL 0
#ifdef CONFIG_SMP
/*
......@@ -694,46 +649,68 @@ restart_crash:
restart_go:
#endif
cleanup_table:
.quad system_call, sysc_enter, cleanup_sysc_enter
.quad sysc_return, sysc_leave, cleanup_sysc_return
.quad sysc_leave, sysc_work_loop, cleanup_sysc_leave
.quad sysc_work_loop, sysc_reschedule, cleanup_sysc_return
cleanup_table_entries=(.-cleanup_table) / 24
cleanup_table_system_call:
.quad system_call, sysc_do_svc
cleanup_table_sysc_return:
.quad sysc_return, sysc_leave
cleanup_table_sysc_leave:
.quad sysc_leave, sysc_work_loop
cleanup_table_sysc_work_loop:
.quad sysc_work_loop, sysc_reschedule
cleanup_critical:
lghi %r0,cleanup_table_entries
larl %r1,cleanup_table
lg %r2,SP_PSW+8(%r15)
cleanup_loop:
clg %r2,0(%r1)
jl cleanup_cont
clg %r2,8(%r1)
jl cleanup_found
cleanup_cont:
la %r1,24(%r1)
brct %r0,cleanup_loop
clc 8(8,%r12),BASED(cleanup_table_system_call)
jl 0f
clc 8(8,%r12),BASED(cleanup_table_system_call+8)
jl cleanup_system_call
0:
clc 8(8,%r12),BASED(cleanup_table_sysc_return)
jl 0f
clc 8(8,%r12),BASED(cleanup_table_sysc_return+8)
jl cleanup_sysc_return
0:
clc 8(8,%r12),BASED(cleanup_table_sysc_leave)
jl 0f
clc 8(8,%r12),BASED(cleanup_table_sysc_leave+8)
jl cleanup_sysc_leave
0:
clc 8(8,%r12),BASED(cleanup_table_sysc_work_loop)
jl 0f
clc 8(8,%r12),BASED(cleanup_table_sysc_work_loop+8)
jl cleanup_sysc_leave
0:
br %r14
cleanup_found:
lg %r1,16(%r1)
br %r1
cleanup_sysc_enter:
CLEANUP_SAVE_ALL __LC_SVC_OLD_PSW,__LC_SAVE_AREA,1
llgh %r0,0x8a
stg %r0,SP_R7(%r15)
larl %r1,sysc_enter
stg %r1,SP_PSW+8(%r15)
cleanup_system_call:
mvc __LC_RETURN_PSW(8),0(%r12)
clc 8(8,%r12),BASED(cleanup_table_system_call)
jne 0f
mvc __LC_SAVE_AREA(32),__LC_SAVE_AREA+32
0: stg %r13,__LC_SAVE_AREA+40
SAVE_ALL __LC_SVC_OLD_PSW,__LC_SAVE_AREA,1
stg %r15,__LC_SAVE_AREA+56
llgh %r7,__LC_SVC_INT_CODE
mvc __LC_RETURN_PSW+8(8),BASED(cleanup_table_system_call+8)
la %r12,__LC_RETURN_PSW
br %r14
cleanup_sysc_return:
larl %r1,sysc_return
stg %r1,SP_PSW+8(%r15)
mvc __LC_RETURN_PSW(8),0(%r12)
mvc __LC_RETURN_PSW+8(8),BASED(cleanup_table_sysc_return)
la %r12,__LC_RETURN_PSW
br %r14
cleanup_sysc_leave:
CLEANUP_RESTORE_ALL
clc 8(8,%r12),BASED(cleanup_sysc_leave_lpsw)
je 0f
mvc __LC_RETURN_PSW(16),SP_PSW(%r15)
mvc __LC_SAVE_AREA+32(32),SP_R12(%r15)
lmg %r0,%r11,SP_R0(%r15)
lg %r15,SP_R15(%r15)
0: la %r12,__LC_RETURN_PSW
br %r14
cleanup_sysc_leave_lpsw:
.quad sysc_leave + 12
/*
* Integer constants
......@@ -741,6 +718,12 @@ cleanup_sysc_leave:
.align 4
.Lconst:
.Lc_pactive: .long PREEMPT_ACTIVE
.Lnr_syscalls: .long NR_syscalls
.L0x0130: .short 0x130
.L0x0140: .short 0x140
.L0x0150: .short 0x150
.L0x0160: .short 0x160
.L0x0170: .short 0x170
.Lcritical_start:
.quad __critical_start
.Lcritical_end:
......
drivers/s390/cio/device_ops.c
View file @ 3999e97e
/*
* drivers/s390/cio/device_ops.c
*
* $Revision: 1.47 $
* $Revision: 1.49 $
*
* Copyright (C) 2002 IBM Deutschland Entwicklung GmbH,
* IBM Corporation
......@@ -15,6 +15,7 @@
#include <linux/slab.h>
#include <linux/list.h>
#include <linux/device.h>
#include <linux/delay.h>
#include <asm/ccwdev.h>
#include <asm/idals.h>
......@@ -268,7 +269,7 @@ __ccw_device_retry_loop(struct ccw_device *cdev, struct ccw1 *ccw, long magic)
if ((ret == -EBUSY) || (ret == -EACCES)) {
/* Try again later. */
spin_unlock_irq(&sch->lock);
schedule_timeout(1);
msleep(10);
spin_lock_irq(&sch->lock);
continue;
}
......
Markdown is supported
0% or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment
GitLab Nexedi Edition | About GitLab | About Nexedi | 沪ICP备2021021310号-2 | 沪ICP备2021021310号-7