root/arch/arc/include/asm/ptrace.h

INCLUDED FROM

DEFINITIONS

1. regs_return_value

   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 #ifdef CONFIG_ARC_PLAT_EZNPS
  20         unsigned long eflags;   /* Extended FLAGS */
  21         unsigned long gpa1;     /* General Purpose Aux */
  22 #endif
  23 
  24         /* Real registers */
  25         unsigned long bta;      /* bta_l1, bta_l2, erbta */
  26 
  27         unsigned long lp_start, lp_end, lp_count;
  28 
  29         unsigned long status32; /* status32_l1, status32_l2, erstatus */
  30         unsigned long ret;      /* ilink1, ilink2 or eret */
  31         unsigned long blink;
  32         unsigned long fp;
  33         unsigned long r26;      /* gp */
  34 
  35         unsigned long r12, r11, r10, r9, r8, r7, r6, r5, r4, r3, r2, r1, r0;
  36 
  37         unsigned long sp;       /* User/Kernel depending on where we came from */
  38         unsigned long orig_r0;
  39 
  40         /*
  41          * To distinguish bet excp, syscall, irq
  42          * For traps and exceptions, Exception Cause Register.
  43          *      ECR: <00> <VV> <CC> <PP>
  44          *      Last word used by Linux for extra state mgmt (syscall-restart)
  45          * For interrupts, use artificial ECR values to note current prio-level
  46          */
  47         union {
  48                 struct {
  49 #ifdef CONFIG_CPU_BIG_ENDIAN
  50                         unsigned long state:8, ecr_vec:8,
  51                                       ecr_cause:8, ecr_param:8;
  52 #else
  53                         unsigned long ecr_param:8, ecr_cause:8,
  54                                       ecr_vec:8, state:8;
  55 #endif
  56                 };
  57                 unsigned long event;
  58         };
  59 
  60         unsigned long user_r25;
  61 };
  62 #else
  63 
  64 struct pt_regs {
  65 
  66         unsigned long orig_r0;
  67 
  68         union {
  69                 struct {
  70 #ifdef CONFIG_CPU_BIG_ENDIAN
  71                         unsigned long state:8, ecr_vec:8,
  72                                       ecr_cause:8, ecr_param:8;
  73 #else
  74                         unsigned long ecr_param:8, ecr_cause:8,
  75                                       ecr_vec:8, state:8;
  76 #endif
  77                 };
  78                 unsigned long event;
  79         };
  80 
  81         unsigned long bta;      /* bta_l1, bta_l2, erbta */
  82 
  83         unsigned long user_r25;
  84 
  85         unsigned long r26;      /* gp */
  86         unsigned long fp;
  87         unsigned long sp;       /* user/kernel sp depending on where we came from  */
  88 
  89         unsigned long r12, r30;
  90 
  91 #ifdef CONFIG_ARC_HAS_ACCL_REGS
  92         unsigned long r58, r59; /* ACCL/ACCH used by FPU / DSP MPY */
  93 #endif
  94 
  95         /*------- Below list auto saved by h/w -----------*/
  96         unsigned long r0, r1, r2, r3, r4, r5, r6, r7, r8, r9, r10, r11;
  97 
  98         unsigned long blink;
  99         unsigned long lp_end, lp_start, lp_count;
 100 
 101         unsigned long ei, ldi, jli;
 102 
 103         unsigned long ret;
 104         unsigned long status32;
 105 };
 106 
 107 #endif
 108 
 109 /* Callee saved registers - need to be saved only when you are scheduled out */
 110 
 111 struct callee_regs {
 112         unsigned long r25, r24, r23, r22, r21, r20, r19, r18, r17, r16, r15, r14, r13;
 113 };
 114 
 115 #define instruction_pointer(regs)       ((regs)->ret)
 116 #define profile_pc(regs)                instruction_pointer(regs)
 117 
 118 /* return 1 if user mode or 0 if kernel mode */
 119 #define user_mode(regs) (regs->status32 & STATUS_U_MASK)
 120 
 121 #define user_stack_pointer(regs)\
 122 ({  unsigned int sp;            \
 123         if (user_mode(regs))    \
 124                 sp = (regs)->sp;\
 125         else                    \
 126                 sp = -1;        \
 127         sp;                     \
 128 })
 129 
 130 /* return 1 if PC in delay slot */
 131 #define delay_mode(regs) ((regs->status32 & STATUS_DE_MASK) == STATUS_DE_MASK)
 132 
 133 #define in_syscall(regs)    ((regs->ecr_vec == ECR_V_TRAP) && !regs->ecr_param)
 134 #define in_brkpt_trap(regs) ((regs->ecr_vec == ECR_V_TRAP) && regs->ecr_param)
 135 
 136 #define STATE_SCALL_RESTARTED   0x01
 137 
 138 #define syscall_wont_restart(reg) (reg->state |= STATE_SCALL_RESTARTED)
 139 #define syscall_restartable(reg) !(reg->state &  STATE_SCALL_RESTARTED)
 140 
 141 #define current_pt_regs()                                       \
 142 ({                                                              \
 143         /* open-coded current_thread_info() */                  \
 144         register unsigned long sp asm ("sp");                   \
 145         unsigned long pg_start = (sp & ~(THREAD_SIZE - 1));     \
 146         (struct pt_regs *)(pg_start + THREAD_SIZE) - 1; \
 147 })
 148 
 149 static inline long regs_return_value(struct pt_regs *regs)
 150 {
 151         return (long)regs->r0;
 152 }
 153 
 154 #endif /* !__ASSEMBLY__ */
 155 
 156 #endif /* __ASM_PTRACE_H */