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/* SPDX-License-Identifier: GPL-2.0 */
/*
* S390 version
* Copyright IBM Corp. 1999, 2000
* Author(s): Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com)
*/
#ifndef _S390_PTRACE_H
#define _S390_PTRACE_H
#include <linux/bits.h>
#include <uapi/asm/ptrace.h>
#include <asm/tpi.h>
#define PIF_SYSCALL 0 /* inside a system call */
#define PIF_EXECVE_PGSTE_RESTART 1 /* restart execve for PGSTE binaries */
#define PIF_SYSCALL_RET_SET 2 /* return value was set via ptrace */
#define PIF_GUEST_FAULT 3 /* indicates program check in sie64a */
#define PIF_FTRACE_FULL_REGS 4 /* all register contents valid (ftrace) */
#define _PIF_SYSCALL BIT(PIF_SYSCALL)
#define _PIF_EXECVE_PGSTE_RESTART BIT(PIF_EXECVE_PGSTE_RESTART)
#define _PIF_SYSCALL_RET_SET BIT(PIF_SYSCALL_RET_SET)
#define _PIF_GUEST_FAULT BIT(PIF_GUEST_FAULT)
#define _PIF_FTRACE_FULL_REGS BIT(PIF_FTRACE_FULL_REGS)
#ifndef __ASSEMBLY__
#define PSW_KERNEL_BITS (PSW_DEFAULT_KEY | PSW_MASK_BASE | PSW_ASC_HOME | \
PSW_MASK_EA | PSW_MASK_BA)
#define PSW_USER_BITS (PSW_MASK_DAT | PSW_MASK_IO | PSW_MASK_EXT | \
PSW_DEFAULT_KEY | PSW_MASK_BASE | PSW_MASK_MCHECK | \
PSW_MASK_PSTATE | PSW_ASC_PRIMARY)
struct psw_bits {
unsigned long : 1;
unsigned long per : 1; /* PER-Mask */
unsigned long : 3;
unsigned long dat : 1; /* DAT Mode */
unsigned long io : 1; /* Input/Output Mask */
unsigned long ext : 1; /* External Mask */
unsigned long key : 4; /* PSW Key */
unsigned long : 1;
unsigned long mcheck : 1; /* Machine-Check Mask */
unsigned long wait : 1; /* Wait State */
unsigned long pstate : 1; /* Problem State */
unsigned long as : 2; /* Address Space Control */
unsigned long cc : 2; /* Condition Code */
unsigned long pm : 4; /* Program Mask */
unsigned long ri : 1; /* Runtime Instrumentation */
unsigned long : 6;
unsigned long eaba : 2; /* Addressing Mode */
unsigned long : 31;
unsigned long ia : 64; /* Instruction Address */
};
enum {
PSW_BITS_AMODE_24BIT = 0,
PSW_BITS_AMODE_31BIT = 1,
PSW_BITS_AMODE_64BIT = 3
};
enum {
PSW_BITS_AS_PRIMARY = 0,
PSW_BITS_AS_ACCREG = 1,
PSW_BITS_AS_SECONDARY = 2,
PSW_BITS_AS_HOME = 3
};
#define psw_bits(__psw) (*({ \
typecheck(psw_t, __psw); \
&(*(struct psw_bits *)(&(__psw))); \
}))
#define PGM_INT_CODE_MASK 0x7f
#define PGM_INT_CODE_PER 0x80
/*
* The pt_regs struct defines the way the registers are stored on
* the stack during a system call.
*/
struct pt_regs {
union {
user_pt_regs user_regs;
struct {
unsigned long args[1];
psw_t psw;
unsigned long gprs[NUM_GPRS];
};
};
unsigned long orig_gpr2;
union {
struct {
unsigned int int_code;
unsigned int int_parm;
unsigned long int_parm_long;
};
struct tpi_info tpi_info;
};
unsigned long flags;
unsigned long cr1;
unsigned long last_break;
};
/*
* 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
static inline void set_pt_regs_flag(struct pt_regs *regs, int flag)
{
regs->flags |= (1UL << flag);
}
static inline void clear_pt_regs_flag(struct pt_regs *regs, int flag)
{
regs->flags &= ~(1UL << flag);
}
static inline int test_pt_regs_flag(struct pt_regs *regs, int flag)
{
return !!(regs->flags & (1UL << flag));
}
static inline int test_and_clear_pt_regs_flag(struct pt_regs *regs, int flag)
{
int ret = test_pt_regs_flag(regs, flag);
clear_pt_regs_flag(regs, flag);
return ret;
}
/*
* These are defined as per linux/ptrace.h, which see.
*/
#define arch_has_single_step() (1)
#define arch_has_block_step() (1)
#define user_mode(regs) (((regs)->psw.mask & PSW_MASK_PSTATE) != 0)
#define instruction_pointer(regs) ((regs)->psw.addr)
#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];
}
static inline void instruction_pointer_set(struct pt_regs *regs,
unsigned long val)
{
regs->psw.addr = val;
}
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);
/**
* regs_get_kernel_argument() - get Nth function argument in kernel
* @regs: pt_regs of that context
* @n: function argument number (start from 0)
*
* regs_get_kernel_argument() returns @n th argument of the function call.
*/
static inline unsigned long regs_get_kernel_argument(struct pt_regs *regs,
unsigned int n)
{
unsigned int argoffset = STACK_FRAME_OVERHEAD / sizeof(long);
#define NR_REG_ARGUMENTS 5
if (n < NR_REG_ARGUMENTS)
return regs_get_register(regs, 2 + n);
n -= NR_REG_ARGUMENTS;
return regs_get_kernel_stack_nth(regs, argoffset + n);
}
static inline unsigned long kernel_stack_pointer(struct pt_regs *regs)
{
return regs->gprs[15];
}
static inline void regs_set_return_value(struct pt_regs *regs, unsigned long rc)
{
regs->gprs[2] = rc;
}
#endif /* __ASSEMBLY__ */
#endif /* _S390_PTRACE_H */
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