_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
* R15 - kernel stack pointer
*/
- .macro SAVE_ALL_BASE savearea
- stmg %r12,%r15,\savearea
- larl %r13,system_call
- .endm
-
.macro SAVE_ALL psworg,savearea,sync
- la %r12,\psworg
+ stmg %r13,%r15,\savearea
.if \sync
- tm \psworg+1,0x01 # test problem state bit
- jz 2f # skip stack setup save
- lg %r15,__LC_KERNEL_STACK # problem state -> load ksp
+ tm \psworg+1,0x01 # test problem state bit
+ jz 1f # skip stack setup save
+ lg %r15,__LC_KERNEL_STACK # problem state -> load ksp
.else
- tm \psworg+1,0x01 # test problem state bit
- 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 ?
+ 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 ?
slgr %r14,%r15
srag %r14,%r14,14
- jz 2f
-1: lg %r15,__LC_ASYNC_STACK # load async stack
+ jz 1f
+0: lg %r15,__LC_ASYNC_STACK # load async stack
.endif
-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
- 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)
+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
+ 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 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
+ .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
- lmg %r0,%r15,SP_R0(%r15) # load gprs 0-15 of user
- lpswe __LC_RETURN_PSW # back to caller
+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)
+ .endm
+
+ .macro RESTORE_ALL # system exit macro
+ mvc __LC_RETURN_PSW(16),SP_PSW(%r15) # move user PSW to lowcore
+ ni __LC_RETURN_PSW+1,0xfd # clear wait state bit
+ 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
/*
.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
- cl %r1,BASED(.Lnr_syscalls)
+ lghi %r0,NR_syscalls
+ clr %r1,%r0
jnl sysc_nr_ok
lgfr %r7,%r1 # clear high word in r1
slag %r7,%r7,2 # svc 0: system call number in %r1
tm __TI_flags+7(%r9),_TIF_WORK_SVC
jnz sysc_work # there is work to do (signals etc.)
sysc_leave:
- RESTORE_ALL 1
+ RESTORE_ALL
#
# 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
#
# _TIF_SIGPENDING is set, call do_signal
#
sysc_sigpending:
- ni __TI_flags+7(%r9),255-_TIF_SINGLE_STEP # clear TIF_SINGLE_STEP
la %r2,SP_PTREGS(%r15) # load pt_regs
sgr %r3,%r3 # clear *oldset
brasl %r14,do_signal # call do_signal
j sysc_do_restart # restart svc
#
-# _TIF_SINGLE_STEP is set, call do_single_step
+# _TIF_SINGLE_STEP is set, call do_debugger_trap
#
sysc_singlestep:
ni __TI_flags+7(%r9),255-_TIF_SINGLE_STEP # clear TIF_SINGLE_STEP
- lhi %r0,__LC_PGM_OLD_PSW
- sth %r0,SP_TRAP(%r15) # set trap indication to pgm check
+ mvi SP_TRAP+1(%r15),0x28 # set trap indication to pgm check
la %r2,SP_PTREGS(%r15) # address of register-save area
larl %r14,sysc_return # load adr. of system return
- jg do_single_step # branch to do_sigtrap
+ jg do_debugger_trap # branch to do_debugger_trap
__critical_end:
# a new process exits the kernel with ret_from_fork
#
.globl ret_from_fork
-ret_from_fork:
- lg %r13,__LC_SVC_NEW_PSW+8
- lg %r9,__LC_THREAD_INFO # load pointer to thread_info struct
+ret_from_fork:
+ GET_THREAD_INFO # load pointer to task_struct to R9
brasl %r14,schedule_tail
stosm 24(%r15),0x03 # reenable interrupts
j sysc_return
* 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
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
#
#
pgm_per_std:
SAVE_ALL __LC_PGM_OLD_PSW,__LC_SAVE_AREA,1
- lg %r9,__LC_THREAD_INFO # load pointer to thread_info struct
+ GET_THREAD_INFO
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
mvc __THREAD_per+__PER_access_id(1,%r1),__LC_PER_ACCESS_ID
- oi __TI_flags+7(%r9),_TIF_SINGLE_STEP # set TIF_SINGLE_STEP
+ lghi %r4,0x7f
lgf %r3,__LC_PGM_ILC # load program interruption code
- lghi %r8,0x7f
- ngr %r8,%r3 # clear per-event-bit and ilc
- je sysc_return
- j pgm_do_call
+ nr %r4,%r3 # clear per-event-bit and ilc
+ je pgm_per_only # only per of per+check ?
+ sll %r4,3
+ larl %r1,pgm_check_table
+ lg %r1,0(%r4,%r1) # load address of handler routine
+ la %r2,SP_PTREGS(%r15) # address of register-save area
+ basr %r14,%r1 # branch to interrupt-handler
+pgm_per_only:
+ la %r2,SP_PTREGS(15) # address of register-save area
+ larl %r14,sysc_return # load adr. of system return
+ jg do_debugger_trap
#
# it was a single stepped SVC that is causing all the trouble
pgm_svcper:
SAVE_ALL __LC_SVC_OLD_PSW,__LC_SAVE_AREA,1
llgh %r7,__LC_SVC_INT_CODE # get svc number from lowcore
- lg %r9,__LC_THREAD_INFO # load pointer to thread_info struct
+ GET_THREAD_INFO # load pointer to task_struct to R9
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
*/
.globl io_int_handler
io_int_handler:
- stck __LC_INT_CLOCK
- 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
+ stck __LC_INT_CLOCK
+ CHECK_CRITICAL
+ GET_THREAD_INFO # load pointer to task_struct to R9
la %r2,SP_PTREGS(%r15) # address of register-save area
brasl %r14,do_IRQ # call standard irq handler
tm __TI_flags+7(%r9),_TIF_WORK_INT
jnz io_work # there is work to do (signals etc.)
io_leave:
- RESTORE_ALL 0
+ RESTORE_ALL
#ifdef CONFIG_PREEMPT
io_preempt:
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
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
*/
.globl ext_int_handler
ext_int_handler:
- 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
+ CHECK_CRITICAL
+ GET_THREAD_INFO # load pointer to task_struct to R9
+ stck __LC_INT_CLOCK
la %r2,SP_PTREGS(%r15) # address of register-save area
llgh %r3,__LC_EXT_INT_CODE # get interruption code
brasl %r14,do_extint
*/
.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 0
+ RESTORE_ALL
#ifdef CONFIG_SMP
/*
restart_go:
#endif
-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_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_critical:
- 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:
+ 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
br %r14
-
-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
+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)
br %r14
cleanup_sysc_return:
- mvc __LC_RETURN_PSW(8),0(%r12)
- mvc __LC_RETURN_PSW+8(8),BASED(cleanup_table_sysc_return)
- la %r12,__LC_RETURN_PSW
+ larl %r1,sysc_return
+ stg %r1,SP_PSW+8(%r15)
br %r14
cleanup_sysc_leave:
- 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
+ CLEANUP_RESTORE_ALL
br %r14
-cleanup_sysc_leave_lpsw:
- .quad sysc_leave + 12
/*
* Integer constants
.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:
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