LXR linux/arch/arc/include/asm/ptrace.h

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