diff options
Diffstat (limited to 'arch/arc/kernel/entry.S')
| -rw-r--r-- | arch/arc/kernel/entry.S | 43 |
1 files changed, 18 insertions, 25 deletions
diff --git a/arch/arc/kernel/entry.S b/arch/arc/kernel/entry.S index 60406ec62eb8..54e91df678dd 100644 --- a/arch/arc/kernel/entry.S +++ b/arch/arc/kernel/entry.S @@ -29,8 +29,8 @@ ENTRY(sys_clone_wrapper) DISCARD_CALLEE_SAVED_USER GET_CURR_THR_INFO_FLAGS r10 - btst r10, TIF_SYSCALL_TRACE - bnz tracesys_exit + and.f 0, r10, _TIF_SYSCALL_WORK + bnz tracesys_exit b .Lret_from_system_call END(sys_clone_wrapper) @@ -41,8 +41,8 @@ ENTRY(sys_clone3_wrapper) DISCARD_CALLEE_SAVED_USER GET_CURR_THR_INFO_FLAGS r10 - btst r10, TIF_SYSCALL_TRACE - bnz tracesys_exit + and.f 0, r10, _TIF_SYSCALL_WORK + bnz tracesys_exit b .Lret_from_system_call END(sys_clone3_wrapper) @@ -101,11 +101,8 @@ ENTRY(EV_MachineCheck) lr r0, [efa] mov r1, sp - ; hardware auto-disables MMU, re-enable it to allow kernel vaddr - ; access for say stack unwinding of modules for crash dumps - lr r3, [ARC_REG_PID] - or r3, r3, MMU_ENABLE - sr r3, [ARC_REG_PID] + ; MC excpetions disable MMU + ARC_MMU_REENABLE r3 lsr r3, r2, 8 bmsk r3, r3, 7 @@ -165,7 +162,6 @@ END(EV_Extension) tracesys: ; save EFA in case tracer wants the PC of traced task ; using ERET won't work since next-PC has already committed - lr r12, [efa] GET_CURR_TASK_FIELD_PTR TASK_THREAD, r11 st r12, [r11, THREAD_FAULT_ADDR] ; thread.fault_address @@ -178,7 +174,7 @@ tracesys: ; Do the Sys Call as we normally would. ; Validate the Sys Call number - cmp r8, NR_syscalls + cmp r8, NR_syscalls - 1 mov.hi r0, -ENOSYS bhi tracesys_exit @@ -200,6 +196,7 @@ tracesys_exit: st r0, [sp, PT_r0] ; sys call return value in pt_regs ;POST Sys Call Ptrace Hook + mov r0, sp ; pt_regs needed bl @syscall_trace_exit b ret_from_exception ; NOT ret_from_system_call at is saves r0 which ; we'd done before calling post hook above @@ -208,15 +205,9 @@ tracesys_exit: ; Breakpoint TRAP ; --------------------------------------------- trap_with_param: - - ; stop_pc info by gdb needs this info - lr r0, [efa] + mov r0, r12 ; EFA in case ptracer/gdb wants stop_pc mov r1, sp - ; Now that we have read EFA, it is safe to do "fake" rtie - ; and get out of CPU exception mode - FAKE_RET_FROM_EXCPN - ; Save callee regs in case gdb wants to have a look ; SP will grow up by size of CALLEE Reg-File ; NOTE: clobbers r12 @@ -243,6 +234,10 @@ ENTRY(EV_Trap) EXCEPTION_PROLOGUE + lr r12, [efa] + + FAKE_RET_FROM_EXCPN + ;============ TRAP 1 :breakpoints ; Check ECR for trap with arg (PROLOGUE ensures r10 has ECR) bmsk.f 0, r10, 7 @@ -250,18 +245,15 @@ ENTRY(EV_Trap) ;============ TRAP (no param): syscall top level - ; First return from Exception to pure K mode (Exception/IRQs renabled) - FAKE_RET_FROM_EXCPN - ; If syscall tracing ongoing, invoke pre-post-hooks GET_CURR_THR_INFO_FLAGS r10 - btst r10, TIF_SYSCALL_TRACE - bnz tracesys ; this never comes back + and.f 0, r10, _TIF_SYSCALL_WORK + bnz tracesys ; this never comes back ;============ Normal syscall case ; syscall num shd not exceed the total system calls avail - cmp r8, NR_syscalls + cmp r8, NR_syscalls - 1 mov.hi r0, -ENOSYS bhi .Lret_from_system_call @@ -313,7 +305,8 @@ resume_user_mode_begin: mov r0, sp ; pt_regs for arg to do_signal()/do_notify_resume() GET_CURR_THR_INFO_FLAGS r9 - bbit0 r9, TIF_SIGPENDING, .Lchk_notify_resume + and.f 0, r9, _TIF_SIGPENDING|_TIF_NOTIFY_SIGNAL + bz .Lchk_notify_resume ; Normal Trap/IRQ entry only saves Scratch (caller-saved) regs ; in pt_reg since the "C" ABI (kernel code) will automatically |