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- /*
- * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- *
- * Vineetg: March 2009 (Supporting 2 levels of Interrupts)
- * Stack switching code can no longer reliably rely on the fact that
- * if we are NOT in user mode, stack is switched to kernel mode.
- * e.g. L2 IRQ interrupted a L1 ISR which had not yet completed
- * it's prologue including stack switching from user mode
- *
- * Vineetg: Aug 28th 2008: Bug #94984
- * -Zero Overhead Loop Context shd be cleared when entering IRQ/EXcp/Trap
- * Normally CPU does this automatically, however when doing FAKE rtie,
- * we also need to explicitly do this. The problem in macros
- * FAKE_RET_FROM_EXCPN and FAKE_RET_FROM_EXCPN_LOCK_IRQ was that this bit
- * was being "CLEARED" rather then "SET". Actually "SET" clears ZOL context
- *
- * Vineetg: May 5th 2008
- * -Modified CALLEE_REG save/restore macros to handle the fact that
- * r25 contains the kernel current task ptr
- * - Defined Stack Switching Macro to be reused in all intr/excp hdlrs
- * - Shaved off 11 instructions from RESTORE_ALL_INT1 by using the
- * address Write back load ld.ab instead of seperate ld/add instn
- *
- * Amit Bhor, Sameer Dhavale: Codito Technologies 2004
- */
- #ifndef __ASM_ARC_ENTRY_H
- #define __ASM_ARC_ENTRY_H
- #ifdef __ASSEMBLY__
- #include <asm/unistd.h> /* For NR_syscalls defination */
- #include <asm/asm-offsets.h>
- #include <asm/arcregs.h>
- #include <asm/ptrace.h>
- #include <asm/processor.h> /* For VMALLOC_START */
- #include <asm/thread_info.h> /* For THREAD_SIZE */
- /* Note on the LD/ST addr modes with addr reg wback
- *
- * LD.a same as LD.aw
- *
- * LD.a reg1, [reg2, x] => Pre Incr
- * Eff Addr for load = [reg2 + x]
- *
- * LD.ab reg1, [reg2, x] => Post Incr
- * Eff Addr for load = [reg2]
- */
- /*--------------------------------------------------------------
- * Save caller saved registers (scratch registers) ( r0 - r12 )
- * Registers are pushed / popped in the order defined in struct ptregs
- * in asm/ptrace.h
- *-------------------------------------------------------------*/
- .macro SAVE_CALLER_SAVED
- st.a r0, [sp, -4]
- st.a r1, [sp, -4]
- st.a r2, [sp, -4]
- st.a r3, [sp, -4]
- st.a r4, [sp, -4]
- st.a r5, [sp, -4]
- st.a r6, [sp, -4]
- st.a r7, [sp, -4]
- st.a r8, [sp, -4]
- st.a r9, [sp, -4]
- st.a r10, [sp, -4]
- st.a r11, [sp, -4]
- st.a r12, [sp, -4]
- .endm
- /*--------------------------------------------------------------
- * Restore caller saved registers (scratch registers)
- *-------------------------------------------------------------*/
- .macro RESTORE_CALLER_SAVED
- ld.ab r12, [sp, 4]
- ld.ab r11, [sp, 4]
- ld.ab r10, [sp, 4]
- ld.ab r9, [sp, 4]
- ld.ab r8, [sp, 4]
- ld.ab r7, [sp, 4]
- ld.ab r6, [sp, 4]
- ld.ab r5, [sp, 4]
- ld.ab r4, [sp, 4]
- ld.ab r3, [sp, 4]
- ld.ab r2, [sp, 4]
- ld.ab r1, [sp, 4]
- ld.ab r0, [sp, 4]
- .endm
- /*--------------------------------------------------------------
- * Save callee saved registers (non scratch registers) ( r13 - r25 )
- * on kernel stack.
- * User mode callee regs need to be saved in case of
- * -fork and friends for replicating from parent to child
- * -before going into do_signal( ) for ptrace/core-dump
- * Special case handling is required for r25 in case it is used by kernel
- * for caching task ptr. Low level exception/ISR save user mode r25
- * into task->thread.user_r25. So it needs to be retrieved from there and
- * saved into kernel stack with rest of callee reg-file
- *-------------------------------------------------------------*/
- .macro SAVE_CALLEE_SAVED_USER
- st.a r13, [sp, -4]
- st.a r14, [sp, -4]
- st.a r15, [sp, -4]
- st.a r16, [sp, -4]
- st.a r17, [sp, -4]
- st.a r18, [sp, -4]
- st.a r19, [sp, -4]
- st.a r20, [sp, -4]
- st.a r21, [sp, -4]
- st.a r22, [sp, -4]
- st.a r23, [sp, -4]
- st.a r24, [sp, -4]
- #ifdef CONFIG_ARC_CURR_IN_REG
- ; Retrieve orig r25 and save it on stack
- ld r12, [r25, TASK_THREAD + THREAD_USER_R25]
- st.a r12, [sp, -4]
- #else
- st.a r25, [sp, -4]
- #endif
- /* move up by 1 word to "create" callee_regs->"stack_place_holder" */
- sub sp, sp, 4
- .endm
- /*--------------------------------------------------------------
- * Save callee saved registers (non scratch registers) ( r13 - r25 )
- * kernel mode callee regs needed to be saved in case of context switch
- * If r25 is used for caching task pointer then that need not be saved
- * as it can be re-created from current task global
- *-------------------------------------------------------------*/
- .macro SAVE_CALLEE_SAVED_KERNEL
- st.a r13, [sp, -4]
- st.a r14, [sp, -4]
- st.a r15, [sp, -4]
- st.a r16, [sp, -4]
- st.a r17, [sp, -4]
- st.a r18, [sp, -4]
- st.a r19, [sp, -4]
- st.a r20, [sp, -4]
- st.a r21, [sp, -4]
- st.a r22, [sp, -4]
- st.a r23, [sp, -4]
- st.a r24, [sp, -4]
- #ifdef CONFIG_ARC_CURR_IN_REG
- sub sp, sp, 8
- #else
- st.a r25, [sp, -4]
- sub sp, sp, 4
- #endif
- .endm
- /*--------------------------------------------------------------
- * RESTORE_CALLEE_SAVED_KERNEL:
- * Loads callee (non scratch) Reg File by popping from Kernel mode stack.
- * This is reverse of SAVE_CALLEE_SAVED,
- *
- * NOTE:
- * Ideally this shd only be called in switch_to for loading
- * switched-IN task's CALLEE Reg File.
- * For all other cases RESTORE_CALLEE_SAVED_FAST must be used
- * which simply pops the stack w/o touching regs.
- *-------------------------------------------------------------*/
- .macro RESTORE_CALLEE_SAVED_KERNEL
- #ifdef CONFIG_ARC_CURR_IN_REG
- add sp, sp, 8 /* skip callee_reg gutter and user r25 placeholder */
- #else
- add sp, sp, 4 /* skip "callee_regs->stack_place_holder" */
- ld.ab r25, [sp, 4]
- #endif
- ld.ab r24, [sp, 4]
- ld.ab r23, [sp, 4]
- ld.ab r22, [sp, 4]
- ld.ab r21, [sp, 4]
- ld.ab r20, [sp, 4]
- ld.ab r19, [sp, 4]
- ld.ab r18, [sp, 4]
- ld.ab r17, [sp, 4]
- ld.ab r16, [sp, 4]
- ld.ab r15, [sp, 4]
- ld.ab r14, [sp, 4]
- ld.ab r13, [sp, 4]
- .endm
- /*--------------------------------------------------------------
- * RESTORE_CALLEE_SAVED_USER:
- * This is called after do_signal where tracer might have changed callee regs
- * thus we need to restore the reg file.
- * Special case handling is required for r25 in case it is used by kernel
- * for caching task ptr. Ptrace would have modified on-kernel-stack value of
- * r25, which needs to be shoved back into task->thread.user_r25 where from
- * Low level exception/ISR return code will retrieve to populate with rest of
- * callee reg-file.
- *-------------------------------------------------------------*/
- .macro RESTORE_CALLEE_SAVED_USER
- add sp, sp, 4 /* skip "callee_regs->stack_place_holder" */
- #ifdef CONFIG_ARC_CURR_IN_REG
- ld.ab r12, [sp, 4]
- st r12, [r25, TASK_THREAD + THREAD_USER_R25]
- #else
- ld.ab r25, [sp, 4]
- #endif
- ld.ab r24, [sp, 4]
- ld.ab r23, [sp, 4]
- ld.ab r22, [sp, 4]
- ld.ab r21, [sp, 4]
- ld.ab r20, [sp, 4]
- ld.ab r19, [sp, 4]
- ld.ab r18, [sp, 4]
- ld.ab r17, [sp, 4]
- ld.ab r16, [sp, 4]
- ld.ab r15, [sp, 4]
- ld.ab r14, [sp, 4]
- ld.ab r13, [sp, 4]
- .endm
- /*--------------------------------------------------------------
- * Super FAST Restore callee saved regs by simply re-adjusting SP
- *-------------------------------------------------------------*/
- .macro DISCARD_CALLEE_SAVED_USER
- add sp, sp, 14 * 4
- .endm
- /*--------------------------------------------------------------
- * Restore User mode r25 saved in task_struct->thread.user_r25
- *-------------------------------------------------------------*/
- .macro RESTORE_USER_R25
- ld r25, [r25, TASK_THREAD + THREAD_USER_R25]
- .endm
- /*-------------------------------------------------------------
- * given a tsk struct, get to the base of it's kernel mode stack
- * tsk->thread_info is really a PAGE, whose bottom hoists stack
- * which grows upwards towards thread_info
- *------------------------------------------------------------*/
- .macro GET_TSK_STACK_BASE tsk, out
- /* Get task->thread_info (this is essentially start of a PAGE) */
- ld \out, [\tsk, TASK_THREAD_INFO]
- /* Go to end of page where stack begins (grows upwards) */
- add2 \out, \out, (THREAD_SIZE - 4)/4 /* one word GUTTER */
- .endm
- /*--------------------------------------------------------------
- * Switch to Kernel Mode stack if SP points to User Mode stack
- *
- * Entry : r9 contains pre-IRQ/exception/trap status32
- * Exit : SP is set to kernel mode stack pointer
- * If CURR_IN_REG, r25 set to "current" task pointer
- * Clobbers: r9
- *-------------------------------------------------------------*/
- .macro SWITCH_TO_KERNEL_STK
- /* User Mode when this happened ? Yes: Proceed to switch stack */
- bbit1 r9, STATUS_U_BIT, 88f
- /* OK we were already in kernel mode when this event happened, thus can
- * assume SP is kernel mode SP. _NO_ need to do any stack switching
- */
- #ifdef CONFIG_ARC_COMPACT_IRQ_LEVELS
- /* However....
- * If Level 2 Interrupts enabled, we may end up with a corner case:
- * 1. User Task executing
- * 2. L1 IRQ taken, ISR starts (CPU auto-switched to KERNEL mode)
- * 3. But before it could switch SP from USER to KERNEL stack
- * a L2 IRQ "Interrupts" L1
- * Thay way although L2 IRQ happened in Kernel mode, stack is still
- * not switched.
- * To handle this, we may need to switch stack even if in kernel mode
- * provided SP has values in range of USER mode stack ( < 0x7000_0000 )
- */
- brlo sp, VMALLOC_START, 88f
- /* TODO: vineetg:
- * We need to be a bit more cautious here. What if a kernel bug in
- * L1 ISR, caused SP to go whaco (some small value which looks like
- * USER stk) and then we take L2 ISR.
- * Above brlo alone would treat it as a valid L1-L2 sceanrio
- * instead of shouting alound
- * The only feasible way is to make sure this L2 happened in
- * L1 prelogue ONLY i.e. ilink2 is less than a pre-set marker in
- * L1 ISR before it switches stack
- */
- #endif
- /* Save Pre Intr/Exception KERNEL MODE SP on kernel stack
- * safe-keeping not really needed, but it keeps the epilogue code
- * (SP restore) simpler/uniform.
- */
- b.d 77f
- st.a sp, [sp, -12] ; Make room for orig_r0 and orig_r8
- 88: /*------Intr/Ecxp happened in user mode, "switch" stack ------ */
- GET_CURR_TASK_ON_CPU r9
- #ifdef CONFIG_ARC_CURR_IN_REG
- /* If current task pointer cached in r25, time to
- * -safekeep USER r25 in task->thread_struct->user_r25
- * -load r25 with current task ptr
- */
- st.as r25, [r9, (TASK_THREAD + THREAD_USER_R25)/4]
- mov r25, r9
- #endif
- /* With current tsk in r9, get it's kernel mode stack base */
- GET_TSK_STACK_BASE r9, r9
- #ifdef PT_REGS_CANARY
- st 0xabcdabcd, [r9, 0]
- #endif
- /* Save Pre Intr/Exception User SP on kernel stack */
- st.a sp, [r9, -12] ; Make room for orig_r0 and orig_r8
- /* CAUTION:
- * SP should be set at the very end when we are done with everything
- * In case of 2 levels of interrupt we depend on value of SP to assume
- * that everything else is done (loading r25 etc)
- */
- /* set SP to point to kernel mode stack */
- mov sp, r9
- 77: /* ----- Stack Switched to kernel Mode, Now save REG FILE ----- */
- .endm
- /*------------------------------------------------------------
- * "FAKE" a rtie to return from CPU Exception context
- * This is to re-enable Exceptions within exception
- * Look at EV_ProtV to see how this is actually used
- *-------------------------------------------------------------*/
- .macro FAKE_RET_FROM_EXCPN reg
- ld \reg, [sp, PT_status32]
- bic \reg, \reg, (STATUS_U_MASK|STATUS_DE_MASK)
- bset \reg, \reg, STATUS_L_BIT
- sr \reg, [erstatus]
- mov \reg, 55f
- sr \reg, [eret]
- rtie
- 55:
- .endm
- /*
- * @reg [OUT] &thread_info of "current"
- */
- .macro GET_CURR_THR_INFO_FROM_SP reg
- and \reg, sp, ~(THREAD_SIZE - 1)
- .endm
- /*
- * @reg [OUT] thread_info->flags of "current"
- */
- .macro GET_CURR_THR_INFO_FLAGS reg
- GET_CURR_THR_INFO_FROM_SP \reg
- ld \reg, [\reg, THREAD_INFO_FLAGS]
- .endm
- /*--------------------------------------------------------------
- * 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 ptregs.
- *-------------------------------------------------------------*/
- .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
- /*--------------------------------------------------------------
- * 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_EXCEPTION marker
- st \marker, [sp, 8] /* orig_r8 */
- 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_CALLER_SAVED
- st.a r26, [sp, -4] /* gp */
- st.a fp, [sp, -4]
- st.a blink, [sp, -4]
- lr r9, [eret]
- st.a r9, [sp, -4]
- lr r9, [erstatus]
- st.a r9, [sp, -4]
- st.a lp_count, [sp, -4]
- lr r9, [lp_end]
- st.a r9, [sp, -4]
- lr r9, [lp_start]
- st.a r9, [sp, -4]
- lr r9, [erbta]
- st.a r9, [sp, -4]
- #ifdef PT_REGS_CANARY
- mov r9, 0xdeadbeef
- st r9, [sp, -4]
- #endif
- /* move up by 1 word to "create" pt_regs->"stack_place_holder" */
- sub sp, sp, 4
- .endm
- /*--------------------------------------------------------------
- * Save scratch regs for exceptions
- *-------------------------------------------------------------*/
- .macro SAVE_ALL_SYS
- SAVE_ALL_EXCEPTION orig_r8_IS_EXCPN
- .endm
- /*--------------------------------------------------------------
- * Save scratch regs for sys calls
- *-------------------------------------------------------------*/
- .macro SAVE_ALL_TRAP
- /*
- * Setup pt_regs->orig_r8.
- * Encode syscall number (r8) in upper short word of event type (r9)
- * N.B. #1: This is already endian safe (see ptrace.h)
- * #2: Only r9 can be used as scratch as it is already clobbered
- * and it's contents are no longer needed by the latter part
- * of exception prologue
- */
- lsl r9, r8, 16
- or r9, r9, orig_r8_IS_SCALL
- SAVE_ALL_EXCEPTION r9
- .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
- add sp, sp, 4 /* hop over unused "pt_regs->stack_place_holder" */
- ld.ab r9, [sp, 4]
- sr r9, [erbta]
- ld.ab r9, [sp, 4]
- sr r9, [lp_start]
- ld.ab r9, [sp, 4]
- sr r9, [lp_end]
- ld.ab r9, [sp, 4]
- mov lp_count, r9
- ld.ab r9, [sp, 4]
- sr r9, [erstatus]
- ld.ab r9, [sp, 4]
- sr r9, [eret]
- ld.ab blink, [sp, 4]
- ld.ab fp, [sp, 4]
- ld.ab r26, [sp, 4] /* gp */
- RESTORE_CALLER_SAVED
- ld sp, [sp] /* restore original sp */
- /* orig_r0 and orig_r8 skipped automatically */
- .endm
- /*--------------------------------------------------------------
- * Save all registers used by interrupt handlers.
- *-------------------------------------------------------------*/
- .macro SAVE_ALL_INT1
- /* restore original r9 , saved in int1_saved_reg
- * It will be saved on stack in macro: SAVE_CALLER_SAVED
- */
- #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 orig_r8_IS_IRQ1, [sp, 8] /* Event Type */
- st 0, [sp, 4] /* orig_r0 , N/A for IRQ */
- SAVE_CALLER_SAVED
- st.a r26, [sp, -4] /* gp */
- st.a fp, [sp, -4]
- st.a blink, [sp, -4]
- st.a ilink1, [sp, -4]
- lr r9, [status32_l1]
- st.a r9, [sp, -4]
- st.a lp_count, [sp, -4]
- lr r9, [lp_end]
- st.a r9, [sp, -4]
- lr r9, [lp_start]
- st.a r9, [sp, -4]
- lr r9, [bta_l1]
- st.a r9, [sp, -4]
- #ifdef PT_REGS_CANARY
- mov r9, 0xdeadbee1
- st r9, [sp, -4]
- #endif
- /* move up by 1 word to "create" pt_regs->"stack_place_holder" */
- sub sp, sp, 4
- .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 orig_r8_IS_IRQ2, [sp, 8] /* Event Type */
- st 0, [sp, 4] /* orig_r0 , N/A for IRQ */
- SAVE_CALLER_SAVED
- st.a r26, [sp, -4] /* gp */
- st.a fp, [sp, -4]
- st.a blink, [sp, -4]
- st.a ilink2, [sp, -4]
- lr r9, [status32_l2]
- st.a r9, [sp, -4]
- st.a lp_count, [sp, -4]
- lr r9, [lp_end]
- st.a r9, [sp, -4]
- lr r9, [lp_start]
- st.a r9, [sp, -4]
- lr r9, [bta_l2]
- st.a r9, [sp, -4]
- #ifdef PT_REGS_CANARY
- mov r9, 0xdeadbee2
- st r9, [sp, -4]
- #endif
- /* move up by 1 word to "create" pt_regs->"stack_place_holder" */
- sub sp, sp, 4
- .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
- add sp, sp, 4 /* hop over unused "pt_regs->stack_place_holder" */
- ld.ab r9, [sp, 4] /* Actual reg file */
- sr r9, [bta_l1]
- ld.ab r9, [sp, 4]
- sr r9, [lp_start]
- ld.ab r9, [sp, 4]
- sr r9, [lp_end]
- ld.ab r9, [sp, 4]
- mov lp_count, r9
- ld.ab r9, [sp, 4]
- sr r9, [status32_l1]
- ld.ab r9, [sp, 4]
- mov ilink1, r9
- ld.ab blink, [sp, 4]
- ld.ab fp, [sp, 4]
- ld.ab r26, [sp, 4] /* gp */
- RESTORE_CALLER_SAVED
- ld sp, [sp] /* restore original sp */
- /* orig_r0 and orig_r8 skipped automatically */
- .endm
- .macro RESTORE_ALL_INT2
- add sp, sp, 4 /* hop over unused "pt_regs->stack_place_holder" */
- ld.ab r9, [sp, 4]
- sr r9, [bta_l2]
- ld.ab r9, [sp, 4]
- sr r9, [lp_start]
- ld.ab r9, [sp, 4]
- sr r9, [lp_end]
- ld.ab r9, [sp, 4]
- mov lp_count, r9
- ld.ab r9, [sp, 4]
- sr r9, [status32_l2]
- ld.ab r9, [sp, 4]
- mov ilink2, r9
- ld.ab blink, [sp, 4]
- ld.ab fp, [sp, 4]
- ld.ab r26, [sp, 4] /* gp */
- RESTORE_CALLER_SAVED
- ld sp, [sp] /* restore original sp */
- /* orig_r0 and orig_r8 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
- #ifdef CONFIG_SMP
- /*-------------------------------------------------
- * Retrieve the current running task on this CPU
- * 1. Determine curr CPU id.
- * 2. Use it to index into _current_task[ ]
- */
- .macro GET_CURR_TASK_ON_CPU reg
- GET_CPU_ID \reg
- ld.as \reg, [@_current_task, \reg]
- .endm
- /*-------------------------------------------------
- * Save a new task as the "current" task on this CPU
- * 1. Determine curr CPU id.
- * 2. Use it to index into _current_task[ ]
- *
- * Coded differently than GET_CURR_TASK_ON_CPU (which uses LD.AS)
- * because ST r0, [r1, offset] can ONLY have s9 @offset
- * while LD can take s9 (4 byte insn) or LIMM (8 byte insn)
- */
- .macro SET_CURR_TASK_ON_CPU tsk, tmp
- GET_CPU_ID \tmp
- add2 \tmp, @_current_task, \tmp
- st \tsk, [\tmp]
- #ifdef CONFIG_ARC_CURR_IN_REG
- mov r25, \tsk
- #endif
- .endm
- #else /* Uniprocessor implementation of macros */
- .macro GET_CURR_TASK_ON_CPU reg
- ld \reg, [@_current_task]
- .endm
- .macro SET_CURR_TASK_ON_CPU tsk, tmp
- st \tsk, [@_current_task]
- #ifdef CONFIG_ARC_CURR_IN_REG
- mov r25, \tsk
- #endif
- .endm
- #endif /* SMP / UNI */
- /* ------------------------------------------------------------------
- * Get the ptr to some field of Current Task at @off in task struct
- * -Uses r25 for Current task ptr if that is enabled
- */
- #ifdef CONFIG_ARC_CURR_IN_REG
- .macro GET_CURR_TASK_FIELD_PTR off, reg
- add \reg, r25, \off
- .endm
- #else
- .macro GET_CURR_TASK_FIELD_PTR off, reg
- GET_CURR_TASK_ON_CPU \reg
- add \reg, \reg, \off
- .endm
- #endif /* CONFIG_ARC_CURR_IN_REG */
- #endif /* __ASSEMBLY__ */
- #endif /* __ASM_ARC_ENTRY_H */
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