X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=arch%2Fs390%2Fkernel%2Fentry.S;h=06312d09c1a6cfa7d4e19e12e06b4150cefa0174;hb=c7b5ebbddf7bcd3651947760f423e3783bbe6573;hp=1f87bf29c79e76cc6b4ecc673e60aa8562b7b84d;hpb=a2c21200f1c81b08cb55e417b68150bba439b646;p=linux-2.6.git diff --git a/arch/s390/kernel/entry.S b/arch/s390/kernel/entry.S index 1f87bf29c..06312d09c 100644 --- a/arch/s390/kernel/entry.S +++ b/arch/s390/kernel/entry.S @@ -19,6 +19,7 @@ #include #include #include +#include /* * Stack layout for the system_call stack entry. @@ -52,6 +53,9 @@ _TIF_WORK_SVC = (_TIF_SIGPENDING | _TIF_NEED_RESCHED | \ _TIF_RESTART_SVC | _TIF_SINGLE_STEP ) _TIF_WORK_INT = (_TIF_SIGPENDING | _TIF_NEED_RESCHED) +STACK_SHIFT = PAGE_SHIFT + THREAD_ORDER +STACK_SIZE = 1 << STACK_SHIFT + #define BASED(name) name-system_call(%r13) /* @@ -86,10 +90,16 @@ _TIF_WORK_INT = (_TIF_SIGPENDING | _TIF_NEED_RESCHED) bnz BASED(1f) 0: l %r14,__LC_ASYNC_STACK # are we already on the async stack ? slr %r14,%r15 - sra %r14,13 + sra %r14,STACK_SHIFT be BASED(2f) 1: l %r15,__LC_ASYNC_STACK .endif +#ifdef CONFIG_CHECK_STACK + b BASED(3f) +2: tml %r15,STACK_SIZE - CONFIG_STACK_GUARD + bz BASED(stack_overflow) +3: +#endif 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 @@ -99,7 +109,7 @@ _TIF_WORK_INT = (_TIF_SIGPENDING | _TIF_NEED_RESCHED) 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 + st %r12,__SF_BACKCHAIN(%r15) # clear back chain .endm .macro RESTORE_ALL sync @@ -124,46 +134,22 @@ __switch_to: __switch_to_base: tm __THREAD_per(%r3),0xe8 # new process is using per ? bz __switch_to_noper-__switch_to_base(%r1) # if not we're fine - stctl %c9,%c11,24(%r15) # We are using per stuff - clc __THREAD_per(12,%r3),24(%r15) + stctl %c9,%c11,__SF_EMPTY(%r15) # We are using per stuff + clc __THREAD_per(12,%r3),__SF_EMPTY(%r15) be __switch_to_noper-__switch_to_base(%r1) # we got away w/o bashing TLB's lctl %c9,%c11,__THREAD_per(%r3) # Nope we didn't __switch_to_noper: - stm %r6,%r15,24(%r15) # store __switch_to registers of prev task + stm %r6,%r15,__SF_GPRS(%r15)# store __switch_to registers of prev task st %r15,__THREAD_ksp(%r2) # store kernel stack to prev->tss.ksp l %r15,__THREAD_ksp(%r3) # load kernel stack from next->tss.ksp - lm %r6,%r15,24(%r15) # load __switch_to registers of next task + lm %r6,%r15,__SF_GPRS(%r15)# load __switch_to registers of next task st %r3,__LC_CURRENT # __LC_CURRENT = current task struct l %r3,__THREAD_info(%r3) # load thread_info from task struct st %r3,__LC_THREAD_INFO - ahi %r3,8192 + ahi %r3,STACK_SIZE st %r3,__LC_KERNEL_STACK # __LC_KERNEL_STACK = new kernel stack br %r14 -/* - * do_softirq calling function. We want to run the softirq functions on the - * asynchronous interrupt stack. - */ - .global do_call_softirq -do_call_softirq: - stnsm 24(%r15),0xfc - stm %r12,%r15,28(%r15) - lr %r12,%r15 - basr %r13,0 -do_call_base: - l %r0,__LC_ASYNC_STACK - slr %r0,%r15 - sra %r0,13 - be 0f-do_call_base(%r13) - l %r15,__LC_ASYNC_STACK -0: sl %r15,.Lc_overhead-do_call_base(%r13) - st %r12,0(%r15) # store backchain - l %r1,.Ldo_softirq-do_call_base(%r13) - basr %r14,%r1 - lm %r12,%r15,28(%r12) - ssm 24(%r15) - br %r14 - __critical_start: /* * SVC interrupt handler routine. System calls are synchronous events and @@ -304,9 +290,12 @@ sysc_tracenogo: ret_from_fork: l %r13,__LC_SVC_NEW_PSW+4 l %r9,__LC_THREAD_INFO # load pointer to thread_info struct - l %r1,BASED(.Lschedtail) + tm SP_PSW+1(%r15),0x01 # forking a kernel thread ? + bo BASED(0f) + st %r15,SP_R15(%r15) # store stack pointer for new kthread +0: l %r1,BASED(.Lschedtail) basr %r14,%r1 - stosm 24(%r15),0x03 # reenable interrupts + stosm __SF_EMPTY(%r15),0x03 # reenable interrupts b BASED(sysc_return) # @@ -457,7 +446,7 @@ pgm_svcper: mvc __THREAD_per+__PER_address(4,%r1),__LC_PER_ADDRESS mvc __THREAD_per+__PER_access_id(1,%r1),__LC_PER_ACCESS_ID oi __TI_flags+3(%r9),_TIF_SINGLE_STEP # set TIF_SINGLE_STEP - stosm 24(%r15),0x03 # reenable interrupts + stosm __SF_EMPTY(%r15),0x03 # reenable interrupts b BASED(sysc_do_svc) /* @@ -493,16 +482,16 @@ io_preempt: l %r1,SP_R15(%r15) s %r1,BASED(.Lc_spsize) mvc SP_PTREGS(__PT_SIZE,%r1),SP_PTREGS(%r15) - xc 0(4,%r1),0(%r1) # clear back chain + xc __SF_BACKCHAIN(4,%r1),__SF_BACKCHAIN(%r1) # clear back chain lr %r15,%r1 io_resume_loop: tm __TI_flags+3(%r9),_TIF_NEED_RESCHED bno BASED(io_leave) mvc __TI_precount(4,%r9),BASED(.Lc_pactive) - stosm 24(%r15),0x03 # reenable interrupts + stosm __SF_EMPTY(%r15),0x03 # reenable interrupts l %r1,BASED(.Lschedule) basr %r14,%r1 # call schedule - stnsm 24(%r15),0xfc # disable I/O and ext. interrupts + stnsm __SF_EMPTY(%r15),0xfc # disable I/O and ext. interrupts xc __TI_precount(4,%r9),__TI_precount(%r9) b BASED(io_resume_loop) #endif @@ -514,7 +503,7 @@ io_work: l %r1,__LC_KERNEL_STACK s %r1,BASED(.Lc_spsize) mvc SP_PTREGS(__PT_SIZE,%r1),SP_PTREGS(%r15) - xc 0(4,%r1),0(%r1) # clear back chain + xc __SF_BACKCHAIN(4,%r1),__SF_BACKCHAIN(%r1) # clear back chain lr %r15,%r1 # # One of the work bits is on. Find out which one. @@ -532,9 +521,9 @@ io_work_loop: # io_reschedule: l %r1,BASED(.Lschedule) - stosm 24(%r15),0x03 # reenable interrupts + stosm __SF_EMPTY(%r15),0x03 # reenable interrupts basr %r14,%r1 # call scheduler - stnsm 24(%r15),0xfc # disable I/O and ext. interrupts + stnsm __SF_EMPTY(%r15),0xfc # disable I/O and ext. interrupts tm __TI_flags+3(%r9),_TIF_WORK_INT bz BASED(io_leave) # there is no work to do b BASED(io_work_loop) @@ -543,12 +532,12 @@ io_reschedule: # _TIF_SIGPENDING is set, call do_signal # io_sigpending: - stosm 24(%r15),0x03 # reenable interrupts + stosm __SF_EMPTY(%r15),0x03 # reenable interrupts la %r2,SP_PTREGS(%r15) # load pt_regs sr %r3,%r3 # clear *oldset l %r1,BASED(.Ldo_signal) basr %r14,%r1 # call do_signal - stnsm 24(%r15),0xfc # disable I/O and ext. interrupts + stnsm __SF_EMPTY(%r15),0xfc # disable I/O and ext. interrupts b BASED(io_leave) # out of here, do NOT recheck /* @@ -589,8 +578,8 @@ restart_int_handler: l %r15,__LC_SAVE_AREA+60 # load ksp lctl %c0,%c15,__LC_CREGS_SAVE_AREA # get new ctl regs lam %a0,%a15,__LC_AREGS_SAVE_AREA - stosm 0(%r15),0x04 # now we can turn dat on - lm %r6,%r15,24(%r15) # load registers from clone + lm %r6,%r15,__SF_GPRS(%r15) # load registers from clone + stosm __SF_EMPTY(%r15),0x04 # now we can turn dat on basr %r14,0 l %r14,restart_addr-.(%r14) br %r14 # branch to start_secondary @@ -611,6 +600,31 @@ restart_crash: restart_go: #endif +#ifdef CONFIG_CHECK_STACK +/* + * The synchronous or the asynchronous stack overflowed. We are dead. + * No need to properly save the registers, we are going to panic anyway. + * Setup a pt_regs so that show_trace can provide a good call trace. + */ +stack_overflow: + l %r15,__LC_PANIC_STACK # change to panic stack + sl %r15,BASED(.Lc_spsize) + mvc SP_PSW(8,%r15),0(%r12) # move user PSW to stack + stm %r0,%r11,SP_R0(%r15) # store gprs %r0-%r11 to kernel stack + la %r1,__LC_SAVE_AREA + ch %r12,BASED(.L0x020) # old psw addr == __LC_SVC_OLD_PSW ? + be BASED(0f) + ch %r12,BASED(.L0x028) # old psw addr == __LC_PGM_OLD_PSW ? + be BASED(0f) + la %r1,__LC_SAVE_AREA+16 +0: mvc SP_R12(16,%r15),0(%r1) # move %r12-%r15 to stack + xc __SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15) # clear back chain + l %r1,BASED(1f) # branch to kernel_stack_overflow + la %r2,SP_PTREGS(%r15) # load pt_regs + br %r1 +1: .long kernel_stack_overflow +#endif + cleanup_table_system_call: .long system_call + 0x80000000, sysc_do_svc + 0x80000000 cleanup_table_sysc_return: @@ -695,7 +709,6 @@ cleanup_sysc_leave_lpsw: .Ldo_IRQ: .long do_IRQ .Ldo_extint: .long do_extint .Ldo_signal: .long do_signal -.Ldo_softirq: .long do_softirq .Lhandle_per: .long do_single_step .Ljump_table: .long pgm_check_table .Lschedule: .long schedule