diff options
Diffstat (limited to 'arch/cris/arch-v32/kernel/entry.S')
| -rw-r--r-- | arch/cris/arch-v32/kernel/entry.S | 80 |
1 files changed, 50 insertions, 30 deletions
diff --git a/arch/cris/arch-v32/kernel/entry.S b/arch/cris/arch-v32/kernel/entry.S index 1f39861eac8c..0ecb50b8f0d9 100644 --- a/arch/cris/arch-v32/kernel/entry.S +++ b/arch/cris/arch-v32/kernel/entry.S @@ -76,12 +76,15 @@ _need_resched: ; 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 @@ -91,9 +94,10 @@ ret_from_intr: 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. @@ -107,6 +111,7 @@ _resume_userspace: 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. @@ -122,30 +127,28 @@ _resume_userspace: ;; 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 @@ -217,7 +220,9 @@ ret_from_sys_call: 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. @@ -234,10 +239,12 @@ _Rexit: 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. @@ -253,14 +260,18 @@ _syscall_exit_work: 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 @@ -276,7 +287,9 @@ _work_resched: 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. @@ -288,6 +301,7 @@ _work_notifysig: 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 @@ -329,41 +343,43 @@ _syscall_trace_entry: ;; ;; 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: @@ -426,6 +442,7 @@ spurious_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. @@ -458,6 +475,7 @@ multiple_interrupt: move.d $sp, $r10 jump ret_from_intr nop + .size multiple_interrupt, . - multiple_interrupt do_sigtrap: ;; Sigtraps the process that executed the BREAK instruction. Creates a @@ -514,11 +532,13 @@ _ugdb_handle_exception: move.d [$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 |