* after a timer-interrupt and after each system call.
*
* Stack layout in 'ret_from_system_call':
- * ptrace needs to have all regs on the stack.
- * if the order here is changed, it needs to be
+ * ptrace needs to have all regs on the stack.
+ * if the order here is changed, it needs to be
* updated in fork.c:copy_process, signal.c:do_signal,
* ptrace.c and ptrace.h
*
#include <asm/pgtable.h>
;; functions exported from this file
-
+
.globl system_call
.globl ret_from_intr
.globl ret_from_fork
.globl do_sigtrap
.globl gdb_handle_breakpoint
.globl sys_call_table
-
+
;; below are various parts of system_call which are not in the fast-path
-
-#ifdef CONFIG_PREEMPT
+
+#ifdef CONFIG_PREEMPT
; Check if preemptive kernel scheduling should be done
_resume_kernel:
di
nop
#else
#define _resume_kernel _Rexit
-#endif
+#endif
; Called at exit from fork. schedule_tail must be called to drop
; spinlock if CONFIG_PREEMPT
ba ret_from_sys_call
ret_from_intr:
- ;; check for resched if preemptive kernel or if we're going back to user-mode
+ ;; check for resched if preemptive kernel or if we're going back to user-mode
;; this test matches the user_regs(regs) macro
;; we cannot simply test $dccr, because that does not necessarily
;; reflect what mode we'll return into.
-
+
move.d [$sp + PT_dccr], $r0; regs->dccr
btstq 8, $r0 ; U-flag
bpl _resume_kernel
- ; Note that di below is in delay slot
-
+ ; Note that di below is in delay slot
+
_resume_userspace:
di ; so need_resched and sigpending don't change
nop
ba _Rexit
nop
-
+
;; The system_call is called by a BREAK instruction, which works like
;; an interrupt call but it stores the return PC in BRP instead of IRP.
;; Since we dont really want to have two epilogues (one for system calls
;;
;; Since we can't have system calls inside interrupts, it should not matter
;; that we don't stack IRP.
- ;;
+ ;;
;; In r9 we have the wanted syscall number. Arguments come in r10,r11,r12,r13,mof,srp
;;
;; This function looks on the _surface_ like spaghetti programming, but it's
movem $r13, [$sp] ; push r0-r13
push $r10 ; push orig_r10
clear.d [$sp=$sp-4] ; frametype == 0, normal stackframe
-
+
movs.w -ENOSYS, $r0
move.d $r0, [$sp+PT_r10] ; put the default return value in r10 in the frame
movs.w -8192, $r0 ; THREAD_SIZE == 8192
and.d $sp, $r0
-
+
move.d [$r0+TI_flags], $r0
btstq TIF_SYSCALL_TRACE, $r0
bmi _syscall_trace_entry
- nop
+ nop
-_syscall_traced:
+_syscall_traced:
;; check for sanity in the requested syscall number
-
- cmpu.w NR_syscalls, $r9
+
+ cmpu.w NR_syscalls, $r9
bcc ret_from_sys_call
lslq 2, $r9 ; multiply by 4, in the delay slot
;; of the register structure itself. some syscalls need this.
push $sp
-
+
;; the parameter carrying registers r10, r11, r12 and 13 are intact.
- ;; the fifth and sixth parameters (if any) was in mof and srp
+ ;; the fifth and sixth parameters (if any) was in mof and srp
;; respectively, and we need to put them on the stack.
push $srp
push $mof
-
+
jsr [$r9+sys_call_table] ; actually do the system call
addq 3*4, $sp ; pop the mof, srp and regs parameters
move.d $r10, [$sp+PT_r10] ; save the return value
moveq 1, $r9 ; "parameter" to ret_from_sys_call to show it was a sys call
-
+
;; fall through into ret_from_sys_call to return
-
+
ret_from_sys_call:
;; r9 is a parameter - if >=1 we came from a syscall, if 0, from an irq
-
+
;; get the current task-struct pointer (see top for defs)
- movs.w -8192, $r0 ; THREAD_SIZE == 8192
+ movs.w -8192, $r0 ; THREAD_SIZE == 8192
and.d $sp, $r0
di ; make sure need_resched and sigpending don't change
bne _RBFexit ; was not CRIS_FRAME_NORMAL, handle otherwise
addq 4, $sp ; skip orig_r10, in delayslot
movem [$sp+], $r13 ; registers r0-r13
- pop $mof ; multiply overflow register
+ pop $mof ; multiply overflow register
pop $dccr ; condition codes
pop $srp ; subroutine return pointer
;; now we have a 4-word SBFS frame which we do not want to restore
_RBFexit:
movem [$sp+], $r13 ; registers r0-r13, in delay slot
- pop $mof ; multiply overflow register
+ pop $mof ; multiply overflow register
pop $dccr ; condition codes
pop $srp ; subroutine return pointer
rbf [$sp+] ; return by popping the CPU status
;; We get here after doing a syscall if extra work might need to be done
;; perform syscall exit tracing if needed
-
+
_syscall_exit_work:
;; $r0 contains current at this point and irq's are disabled
btstq TIF_SYSCALL_TRACE, $r1
bpl _work_pending
nop
-
+
ei
move.d $r9, $r1 ; preserve r9
jsr do_syscall_trace
move.d $r1, $r9
-
+
ba _resume_userspace
nop
-
+
_work_pending:
move.d [$r0+TI_flags], $r1
btstq TIF_NEED_RESCHED, $r1
bpl _work_notifysig ; was neither trace nor sched, must be signal/notify
nop
-
+
_work_resched:
move.d $r9, $r1 ; preserve r9
jsr schedule
move.d $sp, $r11 ; the regs param
move.d $r1, $r12 ; the thread_info_flags parameter
jsr do_notify_resume
-
+
ba _Rexit
nop
;; We get here as a sidetrack when we've entered a syscall with the
;; trace-bit set. We need to call do_syscall_trace and then continue
;; with the call.
-
+
_syscall_trace_entry:
;; PT_r10 in the frame contains -ENOSYS as required, at this point
-
+
jsr do_syscall_trace
;; now re-enter the syscall code to do the syscall itself
move.d [$sp+PT_r13], $r13
move [$sp+PT_mof], $mof
move [$sp+PT_srp], $srp
-
+
ba _syscall_traced
nop
-
+
;; resume performs the actual task-switching, by switching stack pointers
;; input arguments: r10 = prev, r11 = next, r12 = thread offset in task struct
;; returns old current in r10
;; TODO: see the i386 version. The switch_to which calls resume in our version
;; could really be an inline asm of this.
-resume:
- push $srp ; we keep the old/new PC on the stack
+resume:
+ push $srp ; we keep the old/new PC on the stack
add.d $r12, $r10 ; r10 = current tasks tss
move $dccr, [$r10+THREAD_dccr]; save irq enable state
di
move $usp, [$r10+ THREAD_usp] ; save user-mode stackpointer
-
+
;; See copy_thread for the reason why register R9 is saved.
subq 10*4, $sp
movem $r9, [$sp] ; save non-scratch registers and R9.
-
+
move.d $sp, [$r10+THREAD_ksp] ; save the kernel stack pointer for the old task
move.d $sp, $r10 ; return last running task in r10
and.d -8192, $r10 ; get thread_info from stackpointer
- move.d [$r10+TI_task], $r10 ; get task
+ move.d [$r10+TI_task], $r10 ; get task
add.d $r12, $r11 ; find the new tasks tss
move.d [$r11+THREAD_ksp], $sp ; switch into the new stackframe by restoring kernel sp
movem [$sp+], $r9 ; restore non-scratch registers and R9.
move [$r11+THREAD_usp], $usp ; restore user-mode stackpointer
-
+
move [$r11+THREAD_dccr], $dccr ; restore irq enable status
jump [$sp+] ; restore PC
push $r10 ; frametype == 1, BUSFAULT frame type
move.d $sp, $r10 ; pt_regs argument to handle_mmu_bus_fault
-
+
jsr handle_mmu_bus_fault ; in arch/cris/arch-v10/mm/fault.c
;; now we need to return through the normal path, we cannot just
;; whatever.
moveq 0, $r9 ; busfault is equivalent to an irq
-
+
ba ret_from_intr
nop
-
+
;; special handlers for breakpoint and NMI
hwbreakpoint:
push $dccr
pop $dccr
retb
nop
-
+
IRQ1_interrupt:
;; this prologue MUST match the one in irq.h and the struct in ptregs.h!!!
move $brp,[$sp=$sp-16]; instruction pointer and room for a fake SBFS frame
move.d $r10, [$r11]
#endif
-
+
;; Note that we don't do "setf m" here (or after two necessary NOPs),
;; since *not* doing that saves us from re-entrancy checks. We don't want
;; to get here again due to possible subsequent NMIs; we want the watchdog
#endif /* CONFIG_ETRAX_WATCHDOG and not CONFIG_SVINTO_SIM */
-spurious_interrupt:
+spurious_interrupt:
di
jump hard_reset_now
;; this handles the case when multiple interrupts arrive at the same time
;; we jump to the first set interrupt bit in a priority fashion
;; the hardware will call the unserved interrupts after the handler finishes
-
+
multiple_interrupt:
;; this prologue MUST match the one in irq.h and the struct in ptregs.h!!!
move $irp,[$sp=$sp-16]; instruction pointer and room for a fake SBFS frame
jump ret_from_intr
do_sigtrap:
- ;;
+ ;;
;; SIGTRAP the process that executed the break instruction.
;; Make a frame that Rexit in entry.S expects.
;;
movs.w -8192,$r9 ; THREAD_SIZE == 8192
and.d $sp, $r9
move.d [$r9+TI_task], $r10
- move.d [$r10+TASK_pid], $r10 ; current->pid as arg1.
+ move.d [$r10+TASK_pid], $r10 ; current->pid as arg1.
moveq 5, $r11 ; SIGTRAP as arg2.
- jsr sys_kill
+ jsr sys_kill
jump ret_from_intr ; Use the return routine for interrupts.
-gdb_handle_breakpoint:
+gdb_handle_breakpoint:
push $dccr
push $r0
#ifdef CONFIG_ETRAX_KGDB
- move $dccr, $r0 ; U-flag not affected by previous insns.
+ move $dccr, $r0 ; U-flag not affected by previous insns.
btstq 8, $r0 ; Test the U-flag.
- bmi _ugdb_handle_breakpoint ; Go to user mode debugging.
- nop ; Empty delay slot (cannot pop r0 here).
+ bmi _ugdb_handle_breakpoint ; Go to user mode debugging.
+ nop ; Empty delay slot (cannot pop r0 here).
pop $r0 ; Restore r0.
- ba kgdb_handle_breakpoint ; Go to kernel debugging.
+ ba kgdb_handle_breakpoint ; Go to kernel debugging.
pop $dccr ; Restore dccr in delay slot.
#endif
-
-_ugdb_handle_breakpoint:
+
+_ugdb_handle_breakpoint:
move $brp, $r0 ; Use r0 temporarily for calculation.
subq 2, $r0 ; Set to address of previous instruction.
move $r0, $brp
- pop $r0 ; Restore r0.
- ba do_sigtrap ; SIGTRAP the offending process.
+ pop $r0 ; Restore r0.
+ ba do_sigtrap ; SIGTRAP the offending process.
pop $dccr ; Restore dccr in delay slot.
.data
.dword hw_bp_trigs
.section .rodata,"a"
-sys_call_table:
+sys_call_table:
.long sys_restart_syscall /* 0 - old "setup()" system call, used for restarting */
.long sys_exit
.long sys_fork
.long sys_newlstat
.long sys_newfstat
.long sys_ni_syscall /* old sys_uname holder */
- .long sys_ni_syscall /* sys_iopl in i386 */
+ .long sys_ni_syscall /* 110 */ /* sys_iopl in i386 */
.long sys_vhangup
.long sys_ni_syscall /* old "idle" system call */
.long sys_ni_syscall /* vm86old in i386 */
.long sys_adjtimex
.long sys_mprotect /* 125 */
.long sys_sigprocmask
- .long sys_ni_syscall /* old "create_module" */
+ .long sys_ni_syscall /* old "create_module" */
.long sys_init_module
.long sys_delete_module
.long sys_ni_syscall /* 130: old "get_kernel_syms" */
.long sys_ni_syscall /* streams2 */
.long sys_vfork /* 190 */
.long sys_getrlimit
- .long sys_mmap2
+ .long sys_mmap2 /* mmap_pgoff */
.long sys_truncate64
.long sys_ftruncate64
.long sys_stat64 /* 195 */
.long sys_epoll_ctl /* 255 */
.long sys_epoll_wait
.long sys_remap_file_pages
- .long sys_set_tid_address
- .long sys_timer_create
- .long sys_timer_settime /* 260 */
- .long sys_timer_gettime
- .long sys_timer_getoverrun
- .long sys_timer_delete
- .long sys_clock_settime
- .long sys_clock_gettime /* 265 */
- .long sys_clock_getres
- .long sys_clock_nanosleep
+ .long sys_set_tid_address
+ .long sys_timer_create
+ .long sys_timer_settime /* 260 */
+ .long sys_timer_gettime
+ .long sys_timer_getoverrun
+ .long sys_timer_delete
+ .long sys_clock_settime
+ .long sys_clock_gettime /* 265 */
+ .long sys_clock_getres
+ .long sys_clock_nanosleep
.long sys_statfs64
- .long sys_fstatfs64
- .long sys_tgkill /* 270 */
+ .long sys_fstatfs64
+ .long sys_tgkill /* 270 */
.long sys_utimes
- .long sys_fadvise64_64
+ .long sys_fadvise64_64
.long sys_ni_syscall /* sys_vserver */
.long sys_ni_syscall /* sys_mbind */
.long sys_ni_syscall /* 275 sys_get_mempolicy */
.long sys_mq_timedreceive /* 280 */
.long sys_mq_notify
.long sys_mq_getsetattr
- .long sys_ni_syscall /* reserved for kexec */
+ .long sys_ni_syscall
.long sys_waitid
.long sys_ni_syscall /* 285 */ /* available */
.long sys_add_key
.long sys_preadv
.long sys_pwritev
.long sys_setns /* 335 */
+ .long sys_name_to_handle_at
+ .long sys_open_by_handle_at
+ .long sys_rt_tgsigqueueinfo
+ .long sys_perf_event_open
+ .long sys_recvmmsg /* 340 */
+ .long sys_accept4
+ .long sys_fanotify_init
+ .long sys_fanotify_mark
+ .long sys_prlimit64
+ .long sys_clock_adjtime /* 345 */
+ .long sys_syncfs
+ .long sys_sendmmsg
+ .long sys_process_vm_readv
+ .long sys_process_vm_writev
+ .long sys_kcmp /* 350 */
+ .long sys_finit_module
/*
* NOTE!! This doesn't have to be exact - we just have
.rept NR_syscalls-(.-sys_call_table)/4
.long sys_ni_syscall
.endr
-
+
projects / ~andy / linux / commitdiff