; Called at exit from fork. schedule_tail must be called to drop
; spinlock if CONFIG_PREEMPT.
+ .type ret_from_fork,@function
ret_from_fork:
jsr schedule_tail
nop
ba ret_from_sys_call
nop
+ .size ret_from_fork, . - ret_from_fork
+ .type ret_from_intr,@function
ret_from_intr:
;; Check for resched if preemptive kernel, or if we're going back to
;; user-mode. This test matches the user_regs(regs) macro. Don't simply
move.d [$acr], $r0
btstq 16, $r0 ; User-mode flag.
bpl _resume_kernel
+ .size ret_from_intr, . - ret_from_intr + 2 ; +2 includes the dslot.
; Note that di below is in delay slot.
-
+ .type _resume_userspace,@function
_resume_userspace:
di ; So need_resched and sigpending don't change.
nop
ba _Rexit
nop
+ .size _resume_userspace, . - _resume_userspace
;; The system_call is called by a BREAK instruction, which looks pretty
;; much like any other exception.
;; non-used instructions. Only the non-common cases cause the outlined code
;; to run..
+ .type system_call,@function
system_call:
;; Stack-frame similar to the irq heads, which is reversed in
;; ret_from_sys_call.
- subq 12, $sp ; Skip EXS, EDA.
- move $erp, [$sp]
- subq 4, $sp
- move $srp, [$sp]
- subq 4, $sp
- move $ccs, [$sp]
- subq 4, $sp
- ei ; Allow IRQs while handling system call
- move $spc, [$sp]
- subq 4, $sp
- move $mof, [$sp]
- subq 4, $sp
- move $srs, [$sp]
- subq 4, $sp
- move.d $acr, [$sp]
- subq 14*4, $sp ; Make room for R0-R13.
- movem $r13, [$sp] ; Push R0-R13
- subq 4, $sp
- move.d $r10, [$sp] ; Push orig_r10.
-; Set S-bit when kernel debugging to keep hardware breakpoints active.
+ sub.d 92, $sp ; Skip EXS and EDA.
+ movem $r13, [$sp]
+ move.d $sp, $r8
+ addq 14*4, $r8
+ move.d $acr, $r0
+ move $srs, $r1
+ move $mof, $r2
+ move $spc, $r3
+ move $ccs, $r4
+ move $srp, $r5
+ move $erp, $r6
+ subq 4, $sp
+ movem $r6, [$r8]
+ ei ; Enable interrupts while processing syscalls.
+ move.d $r10, [$sp]
+
+ ; Set S-bit when kernel debugging to keep hardware breakpoints active.
#ifdef CONFIG_ETRAX_KGDB
move $ccs, $r0
or.d (1<<9), $r0
and.d _TIF_ALLWORK_MASK, $r1
bne _syscall_exit_work
nop
+ .size system_call, . - system_call
+ .type _Rexit,@function
_Rexit:
;; This epilogue MUST match the prologues in multiple_interrupt, irq.h
;; and ptregs.h.
addq 8, $sp ; Skip EXS, EDA.
jump $erp
rfe ; Restore condition code stack in delay-slot.
+ .size _Rexit, . - _Rexit
;; We get here after doing a syscall if extra work might need to be done
;; perform syscall exit tracing if needed.
+ .type _syscall_exit_work,@function
_syscall_exit_work:
;; R0 contains current at this point and irq's are disabled.
move.d $r1, $r9
ba _resume_userspace
nop
+ .size _syscall_exit_work, . - _syscall_exit_work
+ .type _work_pending,@function
_work_pending:
addoq +TI_flags, $r0, $acr
move.d [$acr], $r10
btstq TIF_NEED_RESCHED, $r10 ; Need resched?
bpl _work_notifysig ; No, must be signal/notify.
nop
+ .size _work_pending, . - _work_pending
+ .type _work_resched,@function
_work_resched:
move.d $r9, $r1 ; Preserve R9.
jsr schedule
btstq TIF_NEED_RESCHED, $r1
bmi _work_resched ; current->work.need_resched.
nop
+ .size _work_resched, . - _work_resched
+ .type _work_notifysig,@function
_work_notifysig:
;; Deal with pending signals and notify-resume requests.
ba _Rexit
nop
+ .size _work_notifysig, . - _work_notifysig
;; 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
;;
;; Returns old current in R10.
+ .type resume,@function
resume:
- subq 4, $sp
- move $srp, [$sp] ; Keep old/new PC on the stack.
+ subq 4, $sp ; Make space for srp.
+
add.d $r12, $r10 ; R10 = current tasks tss.
addoq +THREAD_ccs, $r10, $acr
+ move $srp, [$sp] ; Keep old/new PC on the stack.
move $ccs, [$acr] ; Save IRQ enable state.
di
addoq +THREAD_usp, $r10, $acr
+ subq 10*4, $sp ; Make room for R9.
move $usp, [$acr] ; 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.
addoq +THREAD_ksp, $r10, $acr
+ move.d $sp, $r10 ; Return last running task in R10.
move.d $sp, [$acr] ; Save kernel SP for old task.
- move.d $sp, $r10 ; Return last running task in R10.
and.d -8192, $r10 ; Get thread_info from stackpointer.
addoq +TI_task, $r10, $acr
- move.d [$acr], $r10 ; Get task.
add.d $r12, $r11 ; Find the new tasks tss.
+ move.d [$acr], $r10 ; Get task.
addoq +THREAD_ksp, $r11, $acr
move.d [$acr], $sp ; Switch to new stackframe.
+ addoq +THREAD_usp, $r11, $acr
movem [$sp+], $r9 ; Restore non-scratch registers and R9.
- addoq +THREAD_usp, $r11, $acr
move [$acr], $usp ; Restore user-mode stackpointer.
addoq +THREAD_ccs, $r11, $acr
+ move.d [$sp+], $r11
+ jump $r11 ; Restore PC.
move [$acr], $ccs ; Restore IRQ enable status.
- move.d [$sp+], $acr
- jump $acr ; Restore PC.
- nop
+ .size resume, . - resume
nmi_interrupt:
;; time. Jump to the first set interrupt bit in a priotiry fashion. The
;; hardware will call the unserved interrupts after the handler
;; finishes.
+ .type multiple_interrupt, @function
multiple_interrupt:
;; This prologue MUST match the one in irq.h and the struct in ptregs.h!
subq 12, $sp ; Skip EXS, EDA.
move.d $sp, $r10
jump ret_from_intr
nop
+ .size multiple_interrupt, . - multiple_interrupt
do_sigtrap:
;; Sigtraps the process that executed the BREAK instruction. Creates a
move.d [$sp+], $r0 ; Restore R0 in delay slot.
.global kernel_execve
+ .type kernel_execve,@function
kernel_execve:
move.d __NR_execve, $r9
break 13
ret
nop
+ .size kernel_execve, . - kernel_execve
.data
projects / mv-sheeva.git / blobdiff