LXR linux/arch/s390/include/asm/ptrace.h

   1/* SPDX-License-Identifier: GPL-2.0 */
   2/*
   3 *  S390 version
   4 *    Copyright IBM Corp. 1999, 2000
   5 *    Author(s): Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com)
   6 */
   7#ifndef _S390_PTRACE_H
   8#define _S390_PTRACE_H
   9
  10#include <linux/const.h>
  11#include <uapi/asm/ptrace.h>
  12
  13#define PIF_SYSCALL             0       /* inside a system call */
  14#define PIF_PER_TRAP            1       /* deliver sigtrap on return to user */
  15#define PIF_SYSCALL_RESTART     2       /* restart the current system call */
  16#define PIF_GUEST_FAULT         3       /* indicates program check in sie64a */
  17
  18#define _PIF_SYSCALL            _BITUL(PIF_SYSCALL)
  19#define _PIF_PER_TRAP           _BITUL(PIF_PER_TRAP)
  20#define _PIF_SYSCALL_RESTART    _BITUL(PIF_SYSCALL_RESTART)
  21#define _PIF_GUEST_FAULT        _BITUL(PIF_GUEST_FAULT)
  22
  23#ifndef __ASSEMBLY__
  24
  25#define PSW_KERNEL_BITS (PSW_DEFAULT_KEY | PSW_MASK_BASE | PSW_ASC_HOME | \
  26                         PSW_MASK_EA | PSW_MASK_BA)
  27#define PSW_USER_BITS   (PSW_MASK_DAT | PSW_MASK_IO | PSW_MASK_EXT | \
  28                         PSW_DEFAULT_KEY | PSW_MASK_BASE | PSW_MASK_MCHECK | \
  29                         PSW_MASK_PSTATE | PSW_ASC_PRIMARY)
  30
  31struct psw_bits {
  32        unsigned long        :  1;
  33        unsigned long per    :  1; /* PER-Mask */
  34        unsigned long        :  3;
  35        unsigned long dat    :  1; /* DAT Mode */
  36        unsigned long io     :  1; /* Input/Output Mask */
  37        unsigned long ext    :  1; /* External Mask */
  38        unsigned long key    :  4; /* PSW Key */
  39        unsigned long        :  1;
  40        unsigned long mcheck :  1; /* Machine-Check Mask */
  41        unsigned long wait   :  1; /* Wait State */
  42        unsigned long pstate :  1; /* Problem State */
  43        unsigned long as     :  2; /* Address Space Control */
  44        unsigned long cc     :  2; /* Condition Code */
  45        unsigned long pm     :  4; /* Program Mask */
  46        unsigned long ri     :  1; /* Runtime Instrumentation */
  47        unsigned long        :  6;
  48        unsigned long eaba   :  2; /* Addressing Mode */
  49        unsigned long        : 31;
  50        unsigned long ia     : 64; /* Instruction Address */
  51};
  52
  53enum {
  54        PSW_BITS_AMODE_24BIT = 0,
  55        PSW_BITS_AMODE_31BIT = 1,
  56        PSW_BITS_AMODE_64BIT = 3
  57};
  58
  59enum {
  60        PSW_BITS_AS_PRIMARY     = 0,
  61        PSW_BITS_AS_ACCREG      = 1,
  62        PSW_BITS_AS_SECONDARY   = 2,
  63        PSW_BITS_AS_HOME        = 3
  64};
  65
  66#define psw_bits(__psw) (*({                    \
  67        typecheck(psw_t, __psw);                \
  68        &(*(struct psw_bits *)(&(__psw)));      \
  69}))
  70
  71/*
  72 * The pt_regs struct defines the way the registers are stored on
  73 * the stack during a system call.
  74 */
  75struct pt_regs 
  76{
  77        union {
  78                user_pt_regs user_regs;
  79                struct {
  80                        unsigned long args[1];
  81                        psw_t psw;
  82                        unsigned long gprs[NUM_GPRS];
  83                };
  84        };
  85        unsigned long orig_gpr2;
  86        unsigned int int_code;
  87        unsigned int int_parm;
  88        unsigned long int_parm_long;
  89        unsigned long flags;
  90};
  91
  92/*
  93 * Program event recording (PER) register set.
  94 */
  95struct per_regs {
  96        unsigned long control;          /* PER control bits */
  97        unsigned long start;            /* PER starting address */
  98        unsigned long end;              /* PER ending address */
  99};
 100
 101/*
 102 * PER event contains information about the cause of the last PER exception.
 103 */
 104struct per_event {
 105        unsigned short cause;           /* PER code, ATMID and AI */
 106        unsigned long address;          /* PER address */
 107        unsigned char paid;             /* PER access identification */
 108};
 109
 110/*
 111 * Simplified per_info structure used to decode the ptrace user space ABI.
 112 */
 113struct per_struct_kernel {
 114        unsigned long cr9;              /* PER control bits */
 115        unsigned long cr10;             /* PER starting address */
 116        unsigned long cr11;             /* PER ending address */
 117        unsigned long bits;             /* Obsolete software bits */
 118        unsigned long starting_addr;    /* User specified start address */
 119        unsigned long ending_addr;      /* User specified end address */
 120        unsigned short perc_atmid;      /* PER trap ATMID */
 121        unsigned long address;          /* PER trap instruction address */
 122        unsigned char access_id;        /* PER trap access identification */
 123};
 124
 125#define PER_EVENT_MASK                  0xEB000000UL
 126
 127#define PER_EVENT_BRANCH                0x80000000UL
 128#define PER_EVENT_IFETCH                0x40000000UL
 129#define PER_EVENT_STORE                 0x20000000UL
 130#define PER_EVENT_STORE_REAL            0x08000000UL
 131#define PER_EVENT_TRANSACTION_END       0x02000000UL
 132#define PER_EVENT_NULLIFICATION         0x01000000UL
 133
 134#define PER_CONTROL_MASK                0x00e00000UL
 135
 136#define PER_CONTROL_BRANCH_ADDRESS      0x00800000UL
 137#define PER_CONTROL_SUSPENSION          0x00400000UL
 138#define PER_CONTROL_ALTERATION          0x00200000UL
 139
 140static inline void set_pt_regs_flag(struct pt_regs *regs, int flag)
 141{
 142        regs->flags |= (1UL << flag);
 143}
 144
 145static inline void clear_pt_regs_flag(struct pt_regs *regs, int flag)
 146{
 147        regs->flags &= ~(1UL << flag);
 148}
 149
 150static inline int test_pt_regs_flag(struct pt_regs *regs, int flag)
 151{
 152        return !!(regs->flags & (1UL << flag));
 153}
 154
 155/*
 156 * These are defined as per linux/ptrace.h, which see.
 157 */
 158#define arch_has_single_step()  (1)
 159#define arch_has_block_step()   (1)
 160
 161#define user_mode(regs) (((regs)->psw.mask & PSW_MASK_PSTATE) != 0)
 162#define instruction_pointer(regs) ((regs)->psw.addr)
 163#define user_stack_pointer(regs)((regs)->gprs[15])
 164#define profile_pc(regs) instruction_pointer(regs)
 165
 166static inline long regs_return_value(struct pt_regs *regs)
 167{
 168        return regs->gprs[2];
 169}
 170
 171static inline void instruction_pointer_set(struct pt_regs *regs,
 172                                           unsigned long val)
 173{
 174        regs->psw.addr = val;
 175}
 176
 177int regs_query_register_offset(const char *name);
 178const char *regs_query_register_name(unsigned int offset);
 179unsigned long regs_get_register(struct pt_regs *regs, unsigned int offset);
 180unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs, unsigned int n);
 181
 182static inline unsigned long kernel_stack_pointer(struct pt_regs *regs)
 183{
 184        return regs->gprs[15];
 185}
 186
 187#endif /* __ASSEMBLY__ */
 188#endif /* _S390_PTRACE_H */
 189