ptrace.h

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/*
 *  S390 version
 *    Copyright IBM Corp. 1999, 2000
 *    Author(s): Denis Joseph Barrow ([email protected],[email protected])
 */
#ifndef _S390_PTRACE_H
#define _S390_PTRACE_H

#include <uapi/asm/ptrace.h>

#ifndef __ASSEMBLY__
#ifndef __s390x__
#else /* __s390x__ */
#endif /* __s390x__ */
extern long psw_kernel_bits;
extern long psw_user_bits;

/*
 * 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 int int_code;
    unsigned long int_parm_long;
};

/*
 * Program event recording (PER) register set.
 */
struct per_regs {
    unsigned long control;      /* PER control bits */
    unsigned long start;        /* PER starting address */
    unsigned long end;      /* PER ending address */
};

/*
 * PER event contains information about the cause of the last PER exception.
 */
struct per_event {
    unsigned short cause;       /* PER code, ATMID and AI */
    unsigned long address;      /* PER address */
    unsigned char paid;     /* PER access identification */
};

/*
 * Simplified per_info structure used to decode the ptrace user space ABI.
 */
struct per_struct_kernel {
    unsigned long cr9;      /* PER control bits */
    unsigned long cr10;     /* PER starting address */
    unsigned long cr11;     /* PER ending address */
    unsigned long bits;     /* Obsolete software bits */
    unsigned long starting_addr;    /* User specified start address */
    unsigned long ending_addr;  /* User specified end address */
    unsigned short perc_atmid;  /* PER trap ATMID */
    unsigned long address;      /* PER trap instruction address */
    unsigned char access_id;    /* PER trap access identification */
};

#define PER_EVENT_MASK          0xEB000000UL

#define PER_EVENT_BRANCH        0x80000000UL
#define PER_EVENT_IFETCH        0x40000000UL
#define PER_EVENT_STORE         0x20000000UL
#define PER_EVENT_STORE_REAL        0x08000000UL
#define PER_EVENT_TRANSACTION_END   0x02000000UL
#define PER_EVENT_NULLIFICATION     0x01000000UL

#define PER_CONTROL_MASK        0x00e00000UL

#define PER_CONTROL_BRANCH_ADDRESS  0x00800000UL
#define PER_CONTROL_SUSPENSION      0x00400000UL
#define PER_CONTROL_ALTERATION      0x00200000UL

#ifdef __s390x__
#endif /* __s390x__ */
/*
 * These are defined as per linux/ptrace.h, which see.
 */
#define arch_has_single_step()  (1)

#define user_mode(regs) (((regs)->psw.mask & PSW_MASK_PSTATE) != 0)
#define instruction_pointer(regs) ((regs)->psw.addr & PSW_ADDR_INSN)
#define user_stack_pointer(regs)((regs)->gprs[15])
#define profile_pc(regs) instruction_pointer(regs)

static inline long regs_return_value(struct pt_regs *regs)
{
    return regs->gprs[2];
}

int regs_query_register_offset(const char *name);
const char *regs_query_register_name(unsigned int offset);
unsigned long regs_get_register(struct pt_regs *regs, unsigned int offset);
unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs, unsigned int n);

static inline unsigned long kernel_stack_pointer(struct pt_regs *regs)
{
    return regs->gprs[15] & PSW_ADDR_INSN;
}

#endif /* __ASSEMBLY__ */
#endif /* _S390_PTRACE_H */