arch/s390/include/asm/ptrace.h

/*
 *  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

/*
 * 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 NUM_CR_WORDS	3

#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_BASE		0x00080000UL	/* always one */
#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_MASK_EA		0x00000000UL
#define PSW_MASK_BA		0x00000000UL

#define PSW_MASK_USER		0x00003F00UL

#define PSW_ADDR_AMODE		0x80000000UL
#define PSW_ADDR_INSN		0x7FFFFFFFUL

#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_BASE		0x0000000000000000UL
#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_MASK_EA		0x0000000100000000UL
#define PSW_MASK_BA		0x0000000080000000UL

#define PSW_MASK_USER		0x00003F0180000000UL

#define PSW_ADDR_AMODE		0x0000000000000000UL
#define PSW_ADDR_INSN		0xFFFFFFFFFFFFFFFFUL

#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

#endif /* __s390x__ */

#ifdef __KERNEL__
extern long psw_kernel_bits;
extern long psw_user_bits;
#endif

/*
 * 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;

typedef struct
{
	__u32		gprs_high[NUM_GPRS];
} s390_compat_regs_high;

#ifdef __KERNEL__

/*
 * 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			0xE9000000UL

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

#define PER_CONTROL_MASK		0x00a00000UL

#define PER_CONTROL_BRANCH_ADDRESS	0x00800000UL
#define PER_CONTROL_ALTERATION		0x00200000UL

#endif

/*
 * Now for the user space program event recording (trace) definitions.
 * The following structures are used only for the ptrace interface, don't
 * touch or even look at it if you don't want to modify the user-space
 * ptrace interface. In particular stay away from it for in-kernel PER.
 */
typedef struct
{
	unsigned long cr[NUM_CR_WORDS];
} 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
#define PTRACE_GET_LAST_BREAK	      0x5006
#define PTRACE_PEEK_SYSTEM_CALL       0x5007
#define PTRACE_POKE_SYSTEM_CALL	      0x5008

/*
 * 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;	/* obsolete, always 0 */
};

#ifdef __KERNEL__
/*
 * 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 /* __KERNEL__ */
#endif /* __ASSEMBLY__ */

#endif /* _S390_PTRACE_H */