arch/arc/include/asm/ptrace.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
   4  *
   5  * Amit Bhor, Sameer Dhavale: Codito Technologies 2004
   6  */
   7 #ifndef __ASM_ARC_PTRACE_H
   8 #define __ASM_ARC_PTRACE_H
   9
  10 #include <uapi/asm/ptrace.h>
  11
  12 #ifndef __ASSEMBLY__
  13
  14 /* THE pt_regs: Defines how regs are saved during entry into kernel */
  15
  16 #ifdef CONFIG_ISA_ARCOMPACT
  17 struct pt_regs {
  18
  19         /* Real registers */
  20         unsigned long bta;      /* bta_l1, bta_l2, erbta */
  21
  22         unsigned long lp_start, lp_end, lp_count;
  23
  24         unsigned long status32; /* status32_l1, status32_l2, erstatus */
  25         unsigned long ret;      /* ilink1, ilink2 or eret */
  26         unsigned long blink;
  27         unsigned long fp;
  28         unsigned long r26;      /* gp */
  29
  30         unsigned long r12, r11, r10, r9, r8, r7, r6, r5, r4, r3, r2, r1, r0;
  31
  32         unsigned long sp;       /* User/Kernel depending on where we came from */
  33         unsigned long orig_r0;
  34
  35         /*
  36          * To distinguish bet excp, syscall, irq
  37          * For traps and exceptions, Exception Cause Register.
  38          *      ECR: <00> <VV> <CC> <PP>
  39          *      Last word used by Linux for extra state mgmt (syscall-restart)
  40          * For interrupts, use artificial ECR values to note current prio-level
  41          */
  42         union {
  43                 struct {
  44 #ifdef CONFIG_CPU_BIG_ENDIAN
  45                         unsigned long state:8, ecr_vec:8,
  46                                       ecr_cause:8, ecr_param:8;
  47 #else
  48                         unsigned long ecr_param:8, ecr_cause:8,
  49                                       ecr_vec:8, state:8;
  50 #endif
  51                 };
  52                 unsigned long event;
  53         };
  54
  55         unsigned long user_r25;
  56 };
  57 #else
  58
  59 struct pt_regs {
  60
  61         unsigned long orig_r0;
  62
  63         union {
  64                 struct {
  65 #ifdef CONFIG_CPU_BIG_ENDIAN
  66                         unsigned long state:8, ecr_vec:8,
  67                                       ecr_cause:8, ecr_param:8;
  68 #else
  69                         unsigned long ecr_param:8, ecr_cause:8,
  70                                       ecr_vec:8, state:8;
  71 #endif
  72                 };
  73                 unsigned long event;
  74         };
  75
  76         unsigned long bta;      /* bta_l1, bta_l2, erbta */
  77
  78         unsigned long user_r25;
  79
  80         unsigned long r26;      /* gp */
  81         unsigned long fp;
  82         unsigned long sp;       /* user/kernel sp depending on where we came from  */
  83
  84         unsigned long r12, r30;
  85
  86 #ifdef CONFIG_ARC_HAS_ACCL_REGS
  87         unsigned long r58, r59; /* ACCL/ACCH used by FPU / DSP MPY */
  88 #endif
  89 #ifdef CONFIG_ARC_DSP_SAVE_RESTORE_REGS
  90         unsigned long DSP_CTRL;
  91 #endif
  92
  93         /*------- Below list auto saved by h/w -----------*/
  94         unsigned long r0, r1, r2, r3, r4, r5, r6, r7, r8, r9, r10, r11;
  95
  96         unsigned long blink;
  97         unsigned long lp_end, lp_start, lp_count;
  98
  99         unsigned long ei, ldi, jli;
 100
 101         unsigned long ret;
 102         unsigned long status32;
 103 };
 104
 105 #endif
 106
 107 /* Callee saved registers - need to be saved only when you are scheduled out */
 108
 109 struct callee_regs {
 110         unsigned long r25, r24, r23, r22, r21, r20, r19, r18, r17, r16, r15, r14, r13;
 111 };
 112
 113 #define instruction_pointer(regs)       ((regs)->ret)
 114 #define profile_pc(regs)                instruction_pointer(regs)
 115
 116 /* return 1 if user mode or 0 if kernel mode */
 117 #define user_mode(regs) (regs->status32 & STATUS_U_MASK)
 118
 119 #define user_stack_pointer(regs)\
 120 ({  unsigned int sp;            \
 121         if (user_mode(regs))    \
 122                 sp = (regs)->sp;\
 123         else                    \
 124                 sp = -1;        \
 125         sp;                     \
 126 })
 127
 128 /* return 1 if PC in delay slot */
 129 #define delay_mode(regs) ((regs->status32 & STATUS_DE_MASK) == STATUS_DE_MASK)
 130
 131 #define in_syscall(regs)    ((regs->ecr_vec == ECR_V_TRAP) && !regs->ecr_param)
 132 #define in_brkpt_trap(regs) ((regs->ecr_vec == ECR_V_TRAP) && regs->ecr_param)
 133
 134 #define STATE_SCALL_RESTARTED   0x01
 135
 136 #define syscall_wont_restart(reg) (reg->state |= STATE_SCALL_RESTARTED)
 137 #define syscall_restartable(reg) !(reg->state &  STATE_SCALL_RESTARTED)
 138
 139 #define current_pt_regs()                                       \
 140 ({                                                              \
 141         /* open-coded current_thread_info() */                  \
 142         register unsigned long sp asm ("sp");                   \
 143         unsigned long pg_start = (sp & ~(THREAD_SIZE - 1));     \
 144         (struct pt_regs *)(pg_start + THREAD_SIZE) - 1; \
 145 })
 146
 147 static inline long regs_return_value(struct pt_regs *regs)
 148 {
 149         return (long)regs->r0;
 150 }
 151
 152 #endif /* !__ASSEMBLY__ */
 153
 154 #endif /* __ASM_PTRACE_H */