#include <asm/thread_info.h>
#include <asm/offsets.h>
#include <asm/unistd.h>
+#include <asm/page.h>
/*
* Stack layout for the system_call stack entry.
_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)
/*
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
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
__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
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)
#
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)
/*
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
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.
#
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)
# _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
/*
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
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:
.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
git://git.onelab.eu / linux-2.6.git / blobdiff