/* * Copyright (C) 2014-15 Synopsys, Inc. (www.synopsys.com) * 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. */ #ifndef __ASM_ARC_ENTRY_H #define __ASM_ARC_ENTRY_H #include /* For NR_syscalls defination */ #include #include #include /* For VMALLOC_START */ #include #ifdef CONFIG_ISA_ARCOMPACT #include /* ISA specific bits */ #else #include #endif /* 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] */ .macro PUSH reg st.a \reg, [sp, -4] .endm .macro PUSHAX aux lr r9, [\aux] PUSH r9 .endm .macro POP reg ld.ab \reg, [sp, 4] .endm .macro POPAX aux POP r9 sr r9, [\aux] .endm /*-------------------------------------------------------------- * Helpers to save/restore Scratch Regs: * used by Interrupt/Exception Prologue/Epilogue *-------------------------------------------------------------*/ .macro SAVE_R0_TO_R12 PUSH r0 PUSH r1 PUSH r2 PUSH r3 PUSH r4 PUSH r5 PUSH r6 PUSH r7 PUSH r8 PUSH r9 PUSH r10 PUSH r11 PUSH r12 .endm .macro RESTORE_R12_TO_R0 POP r12 POP r11 POP r10 POP r9 POP r8 POP r7 POP r6 POP r5 POP r4 POP r3 POP r2 POP r1 POP r0 #ifdef CONFIG_ARC_CURR_IN_REG ld r25, [sp, 12] #endif .endm /*-------------------------------------------------------------- * Helpers to save/restore callee-saved regs: * used by several macros below *-------------------------------------------------------------*/ .macro SAVE_R13_TO_R24 PUSH r13 PUSH r14 PUSH r15 PUSH r16 PUSH r17 PUSH r18 PUSH r19 PUSH r20 PUSH r21 PUSH r22 PUSH r23 PUSH r24 .endm .macro RESTORE_R24_TO_R13 POP r24 POP r23 POP r22 POP r21 POP r20 POP r19 POP r18 POP r17 POP r16 POP r15 POP r14 POP r13 .endm #define OFF_USER_R25_FROM_R24 (SZ_CALLEE_REGS + SZ_PT_REGS - 8)/4 /*-------------------------------------------------------------- * Collect User Mode callee regs as struct callee_regs - needed by * fork/do_signal/unaligned-access-emulation. * (By default only scratch regs are saved on entry to kernel) * * Special handling for r25 if used for caching Task Pointer. * It would have been saved in task->thread.user_r25 already, but to keep * the interface same it is copied into regular r25 placeholder in * struct callee_regs. *-------------------------------------------------------------*/ .macro SAVE_CALLEE_SAVED_USER SAVE_R13_TO_R24 #ifdef CONFIG_ARC_CURR_IN_REG ; Retrieve orig r25 and save it on stack ld.as r12, [sp, OFF_USER_R25_FROM_R24] st.a r12, [sp, -4] #else PUSH r25 #endif .endm /*-------------------------------------------------------------- * Save kernel Mode callee regs at the time of Contect Switch. * * Special handling for r25 if used for caching Task Pointer. * Kernel simply skips saving it since it will be loaded with * incoming task pointer anyways *-------------------------------------------------------------*/ .macro SAVE_CALLEE_SAVED_KERNEL SAVE_R13_TO_R24 #ifdef CONFIG_ARC_CURR_IN_REG sub sp, sp, 4 #else PUSH r25 #endif .endm /*-------------------------------------------------------------- * Opposite of SAVE_CALLEE_SAVED_KERNEL *-------------------------------------------------------------*/ .macro RESTORE_CALLEE_SAVED_KERNEL #ifdef CONFIG_ARC_CURR_IN_REG add sp, sp, 4 /* skip usual r25 placeholder */ #else POP r25 #endif RESTORE_R24_TO_R13 .endm /*-------------------------------------------------------------- * Opposite of SAVE_CALLEE_SAVED_USER * * ptrace tracer or unaligned-access fixup might have changed a user mode * callee reg which is saved back to usual r25 storage location *-------------------------------------------------------------*/ .macro RESTORE_CALLEE_SAVED_USER #ifdef CONFIG_ARC_CURR_IN_REG ld.ab r12, [sp, 4] st.as r12, [sp, OFF_USER_R25_FROM_R24] #else POP r25 #endif RESTORE_R24_TO_R13 .endm /*-------------------------------------------------------------- * Super FAST Restore callee saved regs by simply re-adjusting SP *-------------------------------------------------------------*/ .macro DISCARD_CALLEE_SAVED_USER add sp, sp, SZ_CALLEE_REGS .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 .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 #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 /* __ASM_ARC_ENTRY_H */