-/*--------------------------------------------------------------
- * For early Exception Prologue, a core reg is temporarily needed to
- * code the rest of prolog (stack switching). This is done by stashing
- * 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 pt_regs.
- *-------------------------------------------------------------*/
-.macro EXCPN_PROLOG_FREEUP_REG reg
-#ifdef CONFIG_SMP
- sr \reg, [ARC_REG_SCRATCH_DATA0]
-#else
- st \reg, [@ex_saved_reg1]
-#endif
-.endm
-
-.macro EXCPN_PROLOG_RESTORE_REG reg
-#ifdef CONFIG_SMP
- lr \reg, [ARC_REG_SCRATCH_DATA0]
-#else
- ld \reg, [@ex_saved_reg1]
-#endif
-.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.
- * Registers are pushed / popped in the order defined in struct ptregs
- * in asm/ptrace.h
- * Note that syscalls are implemented via TRAP which is also a exception
- * from CPU's point of view
- *-------------------------------------------------------------*/
-.macro SAVE_ALL_SYS
-
- lr r9, [ecr]
- st r9, [sp, 8] /* ECR */
- st r0, [sp, 4] /* orig_r0, needed only for sys calls */
-
- /* Restore r9 used to code the early prologue */
- EXCPN_PROLOG_RESTORE_REG r9
-
- SAVE_R0_TO_R12
- PUSH gp
- PUSH fp
- PUSH blink
- PUSHAX eret
- PUSHAX erstatus
- PUSH lp_count
- PUSHAX lp_end
- PUSHAX lp_start
- PUSHAX erbta
-.endm
-
-/*--------------------------------------------------------------
- * Restore all registers used by system call or Exceptions
- * SP should always be pointing to the next free stack element
- * when entering this macro.
- *
- * NOTE:
- *
- * It is recommended that lp_count/ilink1/ilink2 not be used as a dest reg
- * for memory load operations. If used in that way interrupts are deffered
- * by hardware and that is not good.
- *-------------------------------------------------------------*/
-.macro RESTORE_ALL_SYS
- POPAX erbta
- POPAX lp_start
- POPAX lp_end
-
- POP r9
- mov lp_count, r9 ;LD to lp_count is not allowed
-
- POPAX erstatus
- POPAX eret
- POP blink
- POP fp
- POP gp
- RESTORE_R12_TO_R0
-
- ld sp, [sp] /* restore original sp */
- /* orig_r0, ECR, user_r25 skipped automatically */
-.endm
-
-
-/*--------------------------------------------------------------
- * Save all registers used by interrupt handlers.
- *-------------------------------------------------------------*/
-.macro SAVE_ALL_INT1
-
- /* restore original r9 to be saved as part of reg-file */
-#ifdef CONFIG_SMP
- lr r9, [ARC_REG_SCRATCH_DATA0]
-#else
- ld r9, [@int1_saved_reg]
-#endif
-
- /* now we are ready to save the remaining context :) */
- st event_IRQ1, [sp, 8] /* Dummy ECR */
- st 0, [sp, 4] /* orig_r0 , N/A for IRQ */
-
- SAVE_R0_TO_R12
- PUSH gp
- PUSH fp
- PUSH blink
- PUSH ilink1
- PUSHAX status32_l1
- PUSH lp_count
- PUSHAX lp_end
- PUSHAX lp_start
- PUSHAX bta_l1
-.endm
-
-.macro SAVE_ALL_INT2
-
- /* TODO-vineetg: SMP we can't use global nor can we use
- * SCRATCH0 as we do for int1 because while int1 is using
- * it, int2 can come
- */
- /* retsore original r9 , saved in sys_saved_r9 */
- ld r9, [@int2_saved_reg]
-
- /* now we are ready to save the remaining context :) */
- st event_IRQ2, [sp, 8] /* Dummy ECR */
- st 0, [sp, 4] /* orig_r0 , N/A for IRQ */
-
- SAVE_R0_TO_R12
- PUSH gp
- PUSH fp
- PUSH blink
- PUSH ilink2
- PUSHAX status32_l2
- PUSH lp_count
- PUSHAX lp_end
- PUSHAX lp_start
- PUSHAX bta_l2
-.endm
-
-/*--------------------------------------------------------------
- * Restore all registers used by interrupt handlers.
- *
- * NOTE:
- *
- * It is recommended that lp_count/ilink1/ilink2 not be used as a dest reg
- * for memory load operations. If used in that way interrupts are deffered
- * by hardware and that is not good.
- *-------------------------------------------------------------*/
-
-.macro RESTORE_ALL_INT1
- POPAX bta_l1
- POPAX lp_start
- POPAX lp_end
-
- POP r9
- mov lp_count, r9 ;LD to lp_count is not allowed
-
- POPAX status32_l1
- POP ilink1
- POP blink
- POP fp
- POP gp
- RESTORE_R12_TO_R0
-
- ld sp, [sp] /* restore original sp */
- /* orig_r0, ECR, user_r25 skipped automatically */
-.endm
-
-.macro RESTORE_ALL_INT2
- POPAX bta_l2
- POPAX lp_start
- POPAX lp_end
-
- POP r9
- mov lp_count, r9 ;LD to lp_count is not allowed
-
- POPAX status32_l2
- POP ilink2
- POP blink
- POP fp
- POP gp
- RESTORE_R12_TO_R0
-
- ld sp, [sp] /* restore original sp */
- /* orig_r0, ECR, user_r25 skipped automatically */
-.endm
-
-
-/* Get CPU-ID of this core */
-.macro GET_CPU_ID reg
- lr \reg, [identity]
- lsr \reg, \reg, 8
- bmsk \reg, \reg, 7
-.endm
-