arch/arc/include/asm/entry.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * Copyright (C) 2014-15 Synopsys, Inc. (www.synopsys.com)
   4  * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
   5  */
   6
   7 #ifndef __ASM_ARC_ENTRY_H
   8 #define __ASM_ARC_ENTRY_H
   9
  10 #include <asm/unistd.h>         /* For NR_syscalls definition */
  11 #include <asm/arcregs.h>
  12 #include <asm/ptrace.h>
  13 #include <asm/processor.h>      /* For VMALLOC_START */
  14 #include <asm/mmu.h>
  15
  16 #ifdef __ASSEMBLY__
  17
  18 #ifdef CONFIG_ISA_ARCOMPACT
  19 #include <asm/entry-compact.h>  /* ISA specific bits */
  20 #else
  21 #include <asm/entry-arcv2.h>
  22 #endif
  23
  24 /*
  25  * save user mode callee regs as struct callee_regs
  26  *  - needed by fork/do_signal/unaligned-access-emulation.
  27  */
  28 .macro SAVE_CALLEE_SAVED_USER
  29         SAVE_ABI_CALLEE_REGS
  30 .endm
  31
  32 /*
  33  * restore user mode callee regs as struct callee_regs
  34  *  - could have been changed by ptrace tracer or unaligned-access fixup
  35  */
  36 .macro RESTORE_CALLEE_SAVED_USER
  37         RESTORE_ABI_CALLEE_REGS
  38 .endm
  39
  40 /*
  41  * save/restore kernel mode callee regs at the time of context switch
  42  */
  43 .macro SAVE_CALLEE_SAVED_KERNEL
  44         SAVE_ABI_CALLEE_REGS
  45 .endm
  46
  47 .macro RESTORE_CALLEE_SAVED_KERNEL
  48         RESTORE_ABI_CALLEE_REGS
  49 .endm
  50
  51 /*--------------------------------------------------------------
  52  * Super FAST Restore callee saved regs by simply re-adjusting SP
  53  *-------------------------------------------------------------*/
  54 .macro DISCARD_CALLEE_SAVED_USER
  55         add     sp, sp, SZ_CALLEE_REGS
  56 .endm
  57
  58 /*-------------------------------------------------------------
  59  * given a tsk struct, get to the base of its kernel mode stack
  60  * tsk->thread_info is really a PAGE, whose bottom hoists stack
  61  * which grows upwards towards thread_info
  62  *------------------------------------------------------------*/
  63
  64 .macro GET_TSK_STACK_BASE tsk, out
  65
  66         /* Get task->thread_info (this is essentially start of a PAGE) */
  67         ld  \out, [\tsk, TASK_THREAD_INFO]
  68
  69         /* Go to end of page where stack begins (grows upwards) */
  70         add2 \out, \out, (THREAD_SIZE)/4
  71
  72 .endm
  73
  74 /*
  75  * @reg [OUT] thread_info->flags of "current"
  76  */
  77 .macro GET_CURR_THR_INFO_FLAGS  reg
  78         GET_CURR_THR_INFO_FROM_SP  \reg
  79         ld  \reg, [\reg, THREAD_INFO_FLAGS]
  80 .endm
  81
  82 #ifdef CONFIG_SMP
  83
  84 /*
  85  * Retrieve the current running task on this CPU
  86  *  - loads it from backing _current_task[] (and can't use the
  87  *    caching reg for current task
  88  */
  89 .macro  GET_CURR_TASK_ON_CPU   reg
  90         GET_CPU_ID  \reg
  91         ld.as  \reg, [@_current_task, \reg]
  92 .endm
  93
  94 /*-------------------------------------------------
  95  * Save a new task as the "current" task on this CPU
  96  * 1. Determine curr CPU id.
  97  * 2. Use it to index into _current_task[ ]
  98  *
  99  * Coded differently than GET_CURR_TASK_ON_CPU (which uses LD.AS)
 100  * because ST r0, [r1, offset] can ONLY have s9 @offset
 101  * while   LD can take s9 (4 byte insn) or LIMM (8 byte insn)
 102  */
 103
 104 .macro  SET_CURR_TASK_ON_CPU    tsk, tmp
 105         GET_CPU_ID  \tmp
 106         add2 \tmp, @_current_task, \tmp
 107         st   \tsk, [\tmp]
 108 #ifdef CONFIG_ARC_CURR_IN_REG
 109         mov gp, \tsk
 110 #endif
 111
 112 .endm
 113
 114
 115 #else   /* Uniprocessor implementation of macros */
 116
 117 .macro  GET_CURR_TASK_ON_CPU    reg
 118         ld  \reg, [@_current_task]
 119 .endm
 120
 121 .macro  SET_CURR_TASK_ON_CPU    tsk, tmp
 122         st  \tsk, [@_current_task]
 123 #ifdef CONFIG_ARC_CURR_IN_REG
 124         mov gp, \tsk
 125 #endif
 126 .endm
 127
 128 #endif /* SMP / UNI */
 129
 130 /*
 131  * Get the ptr to some field of Current Task at @off in task struct
 132  *  - Uses current task cached in reg if enabled
 133  */
 134 #ifdef CONFIG_ARC_CURR_IN_REG
 135
 136 .macro GET_CURR_TASK_FIELD_PTR  off,  reg
 137         add \reg, gp, \off
 138 .endm
 139
 140 #else
 141
 142 .macro GET_CURR_TASK_FIELD_PTR  off,  reg
 143         GET_CURR_TASK_ON_CPU  \reg
 144         add \reg, \reg, \off
 145 .endm
 146
 147 #endif  /* CONFIG_ARC_CURR_IN_REG */
 148
 149 #else   /* !__ASSEMBLY__ */
 150
 151 extern void do_signal(struct pt_regs *);
 152 extern void do_notify_resume(struct pt_regs *);
 153 extern int do_privilege_fault(unsigned long, struct pt_regs *);
 154 extern int do_extension_fault(unsigned long, struct pt_regs *);
 155 extern int insterror_is_error(unsigned long, struct pt_regs *);
 156 extern int do_memory_error(unsigned long, struct pt_regs *);
 157 extern int trap_is_brkpt(unsigned long, struct pt_regs *);
 158 extern int do_misaligned_error(unsigned long, struct pt_regs *);
 159 extern int do_trap5_error(unsigned long, struct pt_regs *);
 160 extern int do_misaligned_access(unsigned long, struct pt_regs *, struct callee_regs *);
 161 extern void do_machine_check_fault(unsigned long, struct pt_regs *);
 162 extern void do_non_swi_trap(unsigned long, struct pt_regs *);
 163 extern void do_insterror_or_kprobe(unsigned long, struct pt_regs *);
 164 extern void do_page_fault(unsigned long, struct pt_regs *);
 165
 166 #endif
 167
 168 #endif  /* __ASM_ARC_ENTRY_H */