diff options
| -rw-r--r-- | arch/arc/include/asm/entry.h | 24 | ||||
| -rw-r--r-- | arch/arc/kernel/entry.S | 56 | ||||
| -rw-r--r-- | arch/arc/mm/tlbex.S | 8 |
3 files changed, 37 insertions, 51 deletions
diff --git a/arch/arc/include/asm/entry.h b/arch/arc/include/asm/entry.h index df57611..8840810 100644 --- a/arch/arc/include/asm/entry.h +++ b/arch/arc/include/asm/entry.h @@ -365,7 +365,7 @@ * it to memory (non-SMP case) or SCRATCH0 Aux Reg (SMP). * * Before saving the full regfile - this reg is restored back, only - * to be saved again on kernel mode stack, as part of ptregs. + * to be saved again on kernel mode stack, as part of pt_regs. *-------------------------------------------------------------*/ .macro EXCPN_PROLOG_FREEUP_REG reg #ifdef CONFIG_SMP @@ -384,6 +384,28 @@ .endm /*-------------------------------------------------------------- + * Exception Entry prologue + * -Switches stack to K mode (if not already) + * -Saves the register file + * + * After this it is safe to call the "C" handlers + *-------------------------------------------------------------*/ +.macro EXCEPTION_PROLOGUE + + /* Need at least 1 reg to code the early exception prologue */ + EXCPN_PROLOG_FREEUP_REG r9 + + /* U/K mode at time of exception (stack not switched if already K) */ + lr r9, [erstatus] + + /* ARC700 doesn't provide auto-stack switching */ + SWITCH_TO_KERNEL_STK + + /* save the regfile */ + SAVE_ALL_SYS +.endm + +/*-------------------------------------------------------------- * Save all registers used by Exceptions (TLB Miss, Prot-V, Mem err etc) * Requires SP to be already switched to kernel mode Stack * sp points to the next free element on the stack at exit of this macro. diff --git a/arch/arc/kernel/entry.S b/arch/arc/kernel/entry.S index 1d71651..059ca94 100644 --- a/arch/arc/kernel/entry.S +++ b/arch/arc/kernel/entry.S @@ -267,12 +267,7 @@ ARC_EXIT handle_interrupt_level1 ARC_ENTRY instr_service - EXCPN_PROLOG_FREEUP_REG r9 - - lr r9, [erstatus] - - SWITCH_TO_KERNEL_STK - SAVE_ALL_SYS + EXCEPTION_PROLOGUE lr r0, [efa] mov r1, sp @@ -289,15 +284,13 @@ ARC_EXIT instr_service ARC_ENTRY mem_service - EXCPN_PROLOG_FREEUP_REG r9 - - lr r9, [erstatus] - - SWITCH_TO_KERNEL_STK - SAVE_ALL_SYS + EXCEPTION_PROLOGUE lr r0, [efa] mov r1, sp + + FAKE_RET_FROM_EXCPN r9 + bl do_memory_error b ret_from_exception ARC_EXIT mem_service @@ -308,11 +301,7 @@ ARC_EXIT mem_service ARC_ENTRY EV_MachineCheck - EXCPN_PROLOG_FREEUP_REG r9 - lr r9, [erstatus] - - SWITCH_TO_KERNEL_STK - SAVE_ALL_SYS + EXCEPTION_PROLOGUE lr r2, [ecr] lr r0, [efa] @@ -342,13 +331,7 @@ ARC_EXIT EV_MachineCheck ARC_ENTRY EV_TLBProtV - EXCPN_PROLOG_FREEUP_REG r9 - - ;Which mode (user/kernel) was the system in when Exception occured - lr r9, [erstatus] - - SWITCH_TO_KERNEL_STK - SAVE_ALL_SYS + EXCEPTION_PROLOGUE ;---------(3) Save some more regs----------------- ; vineetg: Mar 6th: Random Seg Fault issue #1 @@ -406,12 +389,7 @@ ARC_EXIT EV_TLBProtV ; --------------------------------------------- ARC_ENTRY EV_PrivilegeV - EXCPN_PROLOG_FREEUP_REG r9 - - lr r9, [erstatus] - - SWITCH_TO_KERNEL_STK - SAVE_ALL_SYS + EXCEPTION_PROLOGUE lr r0, [efa] mov r1, sp @@ -427,14 +405,13 @@ ARC_EXIT EV_PrivilegeV ; --------------------------------------------- ARC_ENTRY EV_Extension - EXCPN_PROLOG_FREEUP_REG r9 - lr r9, [erstatus] - - SWITCH_TO_KERNEL_STK - SAVE_ALL_SYS + EXCEPTION_PROLOGUE lr r0, [efa] mov r1, sp + + FAKE_RET_FROM_EXCPN r9 + bl do_extension_fault b ret_from_exception ARC_EXIT EV_Extension @@ -526,14 +503,7 @@ trap_with_param: ARC_ENTRY EV_Trap - ; Need at least 1 reg to code the early exception prolog - EXCPN_PROLOG_FREEUP_REG r9 - - ;Which mode (user/kernel) was the system in when intr occured - lr r9, [erstatus] - - SWITCH_TO_KERNEL_STK - SAVE_ALL_SYS + EXCEPTION_PROLOGUE ;------- (4) What caused the Trap -------------- lr r12, [ecr] diff --git a/arch/arc/mm/tlbex.S b/arch/arc/mm/tlbex.S index 5c5bb23..fc34ebc 100644 --- a/arch/arc/mm/tlbex.S +++ b/arch/arc/mm/tlbex.S @@ -371,13 +371,7 @@ do_slow_path_pf: ; Slow path TLB Miss handled as a regular ARC Exception ; (stack switching / save the complete reg-file). - ; That requires freeing up r9 - EXCPN_PROLOG_FREEUP_REG r9 - - lr r9, [erstatus] - - SWITCH_TO_KERNEL_STK - SAVE_ALL_SYS + EXCEPTION_PROLOGUE ; ------- setup args for Linux Page fault Hanlder --------- mov_s r0, sp |
