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ptrace.h

/*
 *  include/asm-s390/ptrace.h
 *
 *  S390 version
 *    Copyright (C) 1999,2000 IBM Deutschland Entwicklung GmbH, IBM Corporation
 *    Author(s): Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com)
 */

#ifndef _S390_PTRACE_H
#define _S390_PTRACE_H

/*
 * Offsets in the user_regs_struct. They are used for the ptrace
 * system call and in entry.S
 */
#ifndef __s390x__

#define PT_PSWMASK  0x00
#define PT_PSWADDR  0x04
#define PT_GPR0     0x08
#define PT_GPR1     0x0C
#define PT_GPR2     0x10
#define PT_GPR3     0x14
#define PT_GPR4     0x18
#define PT_GPR5     0x1C
#define PT_GPR6     0x20
#define PT_GPR7     0x24
#define PT_GPR8     0x28
#define PT_GPR9     0x2C
#define PT_GPR10    0x30
#define PT_GPR11    0x34
#define PT_GPR12    0x38
#define PT_GPR13    0x3C
#define PT_GPR14    0x40
#define PT_GPR15    0x44
#define PT_ACR0     0x48
#define PT_ACR1     0x4C
#define PT_ACR2     0x50
#define PT_ACR3     0x54
#define PT_ACR4       0x58
#define PT_ACR5       0x5C
#define PT_ACR6       0x60
#define PT_ACR7       0x64
#define PT_ACR8       0x68
#define PT_ACR9       0x6C
#define PT_ACR10    0x70
#define PT_ACR11    0x74
#define PT_ACR12    0x78
#define PT_ACR13    0x7C
#define PT_ACR14    0x80
#define PT_ACR15    0x84
#define PT_ORIGGPR2 0x88
#define PT_FPC        0x90
/*
 * A nasty fact of life that the ptrace api
 * only supports passing of longs.
 */
#define PT_FPR0_HI  0x98
#define PT_FPR0_LO  0x9C
#define PT_FPR1_HI  0xA0
#define PT_FPR1_LO  0xA4
#define PT_FPR2_HI  0xA8
#define PT_FPR2_LO  0xAC
#define PT_FPR3_HI  0xB0
#define PT_FPR3_LO  0xB4
#define PT_FPR4_HI  0xB8
#define PT_FPR4_LO  0xBC
#define PT_FPR5_HI  0xC0
#define PT_FPR5_LO  0xC4
#define PT_FPR6_HI  0xC8
#define PT_FPR6_LO  0xCC
#define PT_FPR7_HI  0xD0
#define PT_FPR7_LO  0xD4
#define PT_FPR8_HI  0xD8
#define PT_FPR8_LO  0XDC
#define PT_FPR9_HI  0xE0
#define PT_FPR9_LO  0xE4
#define PT_FPR10_HI 0xE8
#define PT_FPR10_LO 0xEC
#define PT_FPR11_HI 0xF0
#define PT_FPR11_LO 0xF4
#define PT_FPR12_HI 0xF8
#define PT_FPR12_LO 0xFC
#define PT_FPR13_HI 0x100
#define PT_FPR13_LO 0x104
#define PT_FPR14_HI 0x108
#define PT_FPR14_LO 0x10C
#define PT_FPR15_HI 0x110
#define PT_FPR15_LO 0x114
#define PT_CR_9       0x118
#define PT_CR_10    0x11C
#define PT_CR_11    0x120
#define PT_IEEE_IP  0x13C
#define PT_LASTOFF  PT_IEEE_IP
#define PT_ENDREGS  0x140-1

#define GPR_SIZE  4
#define CR_SIZE         4

#define STACK_FRAME_OVERHEAD  96    /* size of minimum stack frame */

#else /* __s390x__ */

#define PT_PSWMASK  0x00
#define PT_PSWADDR  0x08
#define PT_GPR0     0x10
#define PT_GPR1     0x18
#define PT_GPR2     0x20
#define PT_GPR3     0x28
#define PT_GPR4     0x30
#define PT_GPR5     0x38
#define PT_GPR6     0x40
#define PT_GPR7     0x48
#define PT_GPR8     0x50
#define PT_GPR9     0x58
#define PT_GPR10    0x60
#define PT_GPR11    0x68
#define PT_GPR12    0x70
#define PT_GPR13    0x78
#define PT_GPR14    0x80
#define PT_GPR15    0x88
#define PT_ACR0     0x90
#define PT_ACR1     0x94
#define PT_ACR2     0x98
#define PT_ACR3     0x9C
#define PT_ACR4       0xA0
#define PT_ACR5       0xA4
#define PT_ACR6       0xA8
#define PT_ACR7       0xAC
#define PT_ACR8       0xB0
#define PT_ACR9       0xB4
#define PT_ACR10    0xB8
#define PT_ACR11    0xBC
#define PT_ACR12    0xC0
#define PT_ACR13    0xC4
#define PT_ACR14    0xC8
#define PT_ACR15    0xCC
#define PT_ORIGGPR2 0xD0
#define PT_FPC        0xD8
#define PT_FPR0     0xE0
#define PT_FPR1     0xE8
#define PT_FPR2     0xF0
#define PT_FPR3     0xF8
#define PT_FPR4     0x100
#define PT_FPR5     0x108
#define PT_FPR6     0x110
#define PT_FPR7     0x118
#define PT_FPR8     0x120
#define PT_FPR9     0x128
#define PT_FPR10    0x130
#define PT_FPR11    0x138
#define PT_FPR12    0x140
#define PT_FPR13    0x148
#define PT_FPR14    0x150
#define PT_FPR15    0x158
#define PT_CR_9     0x160
#define PT_CR_10    0x168
#define PT_CR_11    0x170
#define PT_IEEE_IP  0x1A8
#define PT_LASTOFF  PT_IEEE_IP
#define PT_ENDREGS  0x1B0-1

#define GPR_SIZE  8
#define CR_SIZE         8

#define STACK_FRAME_OVERHEAD    160      /* size of minimum stack frame */

#endif /* __s390x__ */

#define NUM_GPRS  16
#define NUM_FPRS  16
#define NUM_CRS         16
#define NUM_ACRS  16

#define FPR_SIZE  8
#define FPC_SIZE  4
#define FPC_PAD_SIZE    4 /* gcc insists on aligning the fpregs */
#define ACR_SIZE  4


#define PTRACE_OLDSETOPTIONS         21

#ifndef __ASSEMBLY__
#include <linux/stddef.h>
#include <linux/types.h>

typedef union
{
      float   f;
      double  d;
        __u64   ui;
      struct
      {
            __u32 hi;
            __u32 lo;
      } fp;
} freg_t;

typedef struct
{
      __u32   fpc;
      freg_t  fprs[NUM_FPRS];              
} s390_fp_regs;

#define FPC_EXCEPTION_MASK      0xF8000000
#define FPC_FLAGS_MASK          0x00F80000
#define FPC_DXC_MASK            0x0000FF00
#define FPC_RM_MASK             0x00000003
#define FPC_VALID_MASK          0xF8F8FF03

/* this typedef defines how a Program Status Word looks like */
typedef struct 
{
        unsigned long mask;
        unsigned long addr;
} __attribute__ ((aligned(8))) psw_t;

typedef struct
{
      __u32 mask;
      __u32 addr;
} __attribute__ ((aligned(8))) psw_compat_t;

#ifndef __s390x__

#define PSW_MASK_PER          0x40000000UL
#define PSW_MASK_DAT          0x04000000UL
#define PSW_MASK_IO           0x02000000UL
#define PSW_MASK_EXT          0x01000000UL
#define PSW_MASK_KEY          0x00F00000UL
#define PSW_MASK_MCHECK       0x00040000UL
#define PSW_MASK_WAIT         0x00020000UL
#define PSW_MASK_PSTATE       0x00010000UL
#define PSW_MASK_ASC          0x0000C000UL
#define PSW_MASK_CC           0x00003000UL
#define PSW_MASK_PM           0x00000F00UL

#define PSW_ADDR_AMODE        0x80000000UL
#define PSW_ADDR_INSN         0x7FFFFFFFUL

#define PSW_BASE_BITS         0x00080000UL
#define PSW_DEFAULT_KEY       (((unsigned long) PAGE_DEFAULT_ACC) << 20)

#define PSW_ASC_PRIMARY       0x00000000UL
#define PSW_ASC_ACCREG        0x00004000UL
#define PSW_ASC_SECONDARY     0x00008000UL
#define PSW_ASC_HOME          0x0000C000UL

#else /* __s390x__ */

#define PSW_MASK_PER          0x4000000000000000UL
#define PSW_MASK_DAT          0x0400000000000000UL
#define PSW_MASK_IO           0x0200000000000000UL
#define PSW_MASK_EXT          0x0100000000000000UL
#define PSW_MASK_KEY          0x00F0000000000000UL
#define PSW_MASK_MCHECK       0x0004000000000000UL
#define PSW_MASK_WAIT         0x0002000000000000UL
#define PSW_MASK_PSTATE       0x0001000000000000UL
#define PSW_MASK_ASC          0x0000C00000000000UL
#define PSW_MASK_CC           0x0000300000000000UL
#define PSW_MASK_PM           0x00000F0000000000UL

#define PSW_ADDR_AMODE        0x0000000000000000UL
#define PSW_ADDR_INSN         0xFFFFFFFFFFFFFFFFUL

#define PSW_BASE_BITS         0x0000000180000000UL
#define PSW_BASE32_BITS       0x0000000080000000UL
#define PSW_DEFAULT_KEY       (((unsigned long) PAGE_DEFAULT_ACC) << 52)

#define PSW_ASC_PRIMARY       0x0000000000000000UL
#define PSW_ASC_ACCREG        0x0000400000000000UL
#define PSW_ASC_SECONDARY     0x0000800000000000UL
#define PSW_ASC_HOME          0x0000C00000000000UL

extern long psw_user32_bits;

#endif /* __s390x__ */

extern long psw_kernel_bits;
extern long psw_user_bits;

/* This macro merges a NEW PSW mask specified by the user into
   the currently active PSW mask CURRENT, modifying only those
   bits in CURRENT that the user may be allowed to change: this
   is the condition code and the program mask bits.  */
#define PSW_MASK_MERGE(CURRENT,NEW) \
      (((CURRENT) & ~(PSW_MASK_CC|PSW_MASK_PM)) | \
       ((NEW) & (PSW_MASK_CC|PSW_MASK_PM)))

/*
 * The s390_regs structure is used to define the elf_gregset_t.
 */
typedef struct
{
      psw_t psw;
      unsigned long gprs[NUM_GPRS];
      unsigned int  acrs[NUM_ACRS];
      unsigned long orig_gpr2;
} s390_regs;

typedef struct
{
      psw_compat_t      psw;
      __u32       gprs[NUM_GPRS];
      __u32       acrs[NUM_ACRS];
      __u32       orig_gpr2;
} s390_compat_regs;


#ifdef __KERNEL__
#include <asm/setup.h>
#include <asm/page.h>

/*
 * The pt_regs struct defines the way the registers are stored on
 * the stack during a system call.
 */
struct pt_regs 
{
      unsigned long args[1];
      psw_t psw;
      unsigned long gprs[NUM_GPRS];
      unsigned long orig_gpr2;
      unsigned short ilc;
      unsigned short trap;
};
#endif

/*
 * Now for the program event recording (trace) definitions.
 */
typedef struct
{
      unsigned long cr[3];
} per_cr_words;

#define PER_EM_MASK 0xE8000000UL

typedef     struct
{
#ifdef __s390x__
      unsigned                       : 32;
#endif /* __s390x__ */
      unsigned em_branching          : 1;
      unsigned em_instruction_fetch  : 1;
      /*
       * Switching on storage alteration automatically fixes
       * the storage alteration event bit in the users std.
       */
      unsigned em_storage_alteration : 1;
      unsigned em_gpr_alt_unused     : 1;
      unsigned em_store_real_address : 1;
      unsigned                       : 3;
      unsigned branch_addr_ctl       : 1;
      unsigned                       : 1;
      unsigned storage_alt_space_ctl : 1;
      unsigned                       : 21;
      unsigned long starting_addr;
      unsigned long ending_addr;
} per_cr_bits;

typedef struct
{
      unsigned short perc_atmid;
      unsigned long address;
      unsigned char access_id;
} per_lowcore_words;

typedef struct
{
      unsigned perc_branching          : 1;
      unsigned perc_instruction_fetch  : 1;
      unsigned perc_storage_alteration : 1;
      unsigned perc_gpr_alt_unused     : 1;
      unsigned perc_store_real_address : 1;
      unsigned                         : 3;
      unsigned atmid_psw_bit_31        : 1;
      unsigned atmid_validity_bit      : 1;
      unsigned atmid_psw_bit_32        : 1;
      unsigned atmid_psw_bit_5         : 1;
      unsigned atmid_psw_bit_16        : 1;
      unsigned atmid_psw_bit_17        : 1;
      unsigned si                      : 2;
      unsigned long address;
      unsigned                         : 4;
      unsigned access_id               : 4;
} per_lowcore_bits;

typedef struct
{
      union {
            per_cr_words   words;
            per_cr_bits    bits;
      } control_regs;
      /*
       * Use these flags instead of setting em_instruction_fetch
       * directly they are used so that single stepping can be
       * switched on & off while not affecting other tracing
       */
      unsigned  single_step       : 1;
      unsigned  instruction_fetch : 1;
      unsigned                    : 30;
      /*
       * These addresses are copied into cr10 & cr11 if single
       * stepping is switched off
       */
      unsigned long starting_addr;
      unsigned long ending_addr;
      union {
            per_lowcore_words words;
            per_lowcore_bits  bits;
      } lowcore; 
} per_struct;

typedef struct
{
      unsigned int  len;
      unsigned long kernel_addr;
      unsigned long process_addr;
} ptrace_area;

/*
 * S/390 specific non posix ptrace requests. I chose unusual values so
 * they are unlikely to clash with future ptrace definitions.
 */
#define PTRACE_PEEKUSR_AREA           0x5000
#define PTRACE_POKEUSR_AREA           0x5001
#define PTRACE_PEEKTEXT_AREA        0x5002
#define PTRACE_PEEKDATA_AREA        0x5003
#define PTRACE_POKETEXT_AREA        0x5004
#define PTRACE_POKEDATA_AREA        0x5005

/*
 * PT_PROT definition is loosely based on hppa bsd definition in
 * gdb/hppab-nat.c
 */
#define PTRACE_PROT                       21

typedef enum
{
      ptprot_set_access_watchpoint,
      ptprot_set_write_watchpoint,
      ptprot_disable_watchpoint
} ptprot_flags;

typedef struct
{
      unsigned long lowaddr;
      unsigned long hiaddr;
      ptprot_flags prot;
} ptprot_area;                     

/* Sequence of bytes for breakpoint illegal instruction.  */
#define S390_BREAKPOINT     {0x0,0x1}
#define S390_BREAKPOINT_U16 ((__u16)0x0001)
#define S390_SYSCALL_OPCODE ((__u16)0x0a00)
#define S390_SYSCALL_SIZE   2

/*
 * The user_regs_struct defines the way the user registers are
 * store on the stack for signal handling.
 */
struct user_regs_struct
{
      psw_t psw;
      unsigned long gprs[NUM_GPRS];
      unsigned int  acrs[NUM_ACRS];
      unsigned long orig_gpr2;
      s390_fp_regs fp_regs;
      /*
       * These per registers are in here so that gdb can modify them
       * itself as there is no "official" ptrace interface for hardware
       * watchpoints. This is the way intel does it.
       */
      per_struct per_info;
      unsigned long ieee_instruction_pointer; 
      /* Used to give failing instruction back to user for ieee exceptions */
};

#ifdef __KERNEL__
/*
 * These are defined as per linux/ptrace.h, which see.
 */
#define arch_has_single_step()      (1)
struct task_struct;
extern void user_enable_single_step(struct task_struct *);
extern void user_disable_single_step(struct task_struct *);

#define __ARCH_WANT_COMPAT_SYS_PTRACE

#define user_mode(regs) (((regs)->psw.mask & PSW_MASK_PSTATE) != 0)
#define instruction_pointer(regs) ((regs)->psw.addr & PSW_ADDR_INSN)
#define regs_return_value(regs)((regs)->gprs[2])
#define profile_pc(regs) instruction_pointer(regs)
extern void show_regs(struct pt_regs * regs);
#endif /* __KERNEL__ */
#endif /* __ASSEMBLY__ */

#endif /* _S390_PTRACE_H */

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