/*
* Based on arch/arm/include/asm/ptrace.h
*
* Copyright (C) 1996-2003 Russell King
* Copyright (C) 2012 ARM Ltd.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef __ASM_PTRACE_H
#define __ASM_PTRACE_H

#include <uapi/asm/ptrace.h>

/* AArch32-specific ptrace requests */
#define COMPAT_PTRACE_GETREGS 12
#define COMPAT_PTRACE_SETREGS 13
#define COMPAT_PTRACE_GET_THREAD_AREA 22
#define COMPAT_PTRACE_SET_SYSCALL 23
#define COMPAT_PTRACE_GETVFPREGS 27
#define COMPAT_PTRACE_SETVFPREGS 28
#define COMPAT_PTRACE_GETHBPREGS 29
#define COMPAT_PTRACE_SETHBPREGS 30

/* AArch32 CPSR bits */
#define COMPAT_PSR_MODE_MASK 0x0000001f
#define COMPAT_PSR_MODE_USR 0x00000010
#define COMPAT_PSR_MODE_FIQ 0x00000011
#define COMPAT_PSR_MODE_IRQ 0x00000012
#define COMPAT_PSR_MODE_SVC 0x00000013
#define COMPAT_PSR_MODE_ABT 0x00000017
#define COMPAT_PSR_MODE_HYP 0x0000001a
#define COMPAT_PSR_MODE_UND 0x0000001b
#define COMPAT_PSR_MODE_SYS 0x0000001f
#define COMPAT_PSR_T_BIT 0x00000020
#define COMPAT_PSR_E_BIT 0x00000200
#define COMPAT_PSR_F_BIT 0x00000040
#define COMPAT_PSR_I_BIT 0x00000080
#define COMPAT_PSR_A_BIT 0x00000100
#define COMPAT_PSR_E_BIT 0x00000200
#define COMPAT_PSR_J_BIT 0x01000000
#define COMPAT_PSR_Q_BIT 0x08000000
#define COMPAT_PSR_V_BIT 0x10000000
#define COMPAT_PSR_C_BIT 0x20000000
#define COMPAT_PSR_Z_BIT 0x40000000
#define COMPAT_PSR_N_BIT 0x80000000
#define COMPAT_PSR_IT_MASK 0x0600fc00 /* If-Then execution state mask */
/*
* These are 'magic' values for PTRACE_PEEKUSR that return info about where a
* process is located in memory.
*/
#define COMPAT_PT_TEXT_ADDR 0x10000
#define COMPAT_PT_DATA_ADDR 0x10004
#define COMPAT_PT_TEXT_END_ADDR 0x10008
#ifndef __ASSEMBLY__

/* sizeof(struct user) for AArch32 */
#define COMPAT_USER_SZ 296

/* Architecturally defined mapping between AArch32 and AArch64 registers */
#define compat_usr(x) regs[(x)]
#define compat_sp regs[13]
#define compat_lr regs[14]
#define compat_sp_hyp regs[15]
#define compat_sp_irq regs[16]
#define compat_lr_irq regs[17]
#define compat_sp_svc regs[18]
#define compat_lr_svc regs[19]
#define compat_sp_abt regs[20]
#define compat_lr_abt regs[21]
#define compat_sp_und regs[22]
#define compat_lr_und regs[23]
#define compat_r8_fiq regs[24]
#define compat_r9_fiq regs[25]
#define compat_r10_fiq regs[26]
#define compat_r11_fiq regs[27]
#define compat_r12_fiq regs[28]
#define compat_sp_fiq regs[29]
#define compat_lr_fiq regs[30]

/*
* This struct defines the way the registers are stored on the stack during an
* exception. Note that sizeof(struct pt_regs) has to be a multiple of 16 (for
* stack alignment). struct user_pt_regs must form a prefix of struct pt_regs.
*/
struct pt_regs {
union {
struct user_pt_regs user_regs;
struct {
u64 regs[31];
u64 sp;
u64 pc;
u64 pstate;
};
};
u64 orig_x0;
u64 syscallno;
};

#define arch_has_single_step() (1)

#ifdef CONFIG_COMPAT
#define compat_thumb_mode(regs) \
(((regs)->pstate & COMPAT_PSR_T_BIT))
#else
#define compat_thumb_mode(regs) (0)
#endif

#define user_mode(regs) \
(((regs)->pstate & PSR_MODE_MASK) == PSR_MODE_EL0t)

#define compat_user_mode(regs) \
(((regs)->pstate & (PSR_MODE32_BIT | PSR_MODE_MASK)) == \
(PSR_MODE32_BIT | PSR_MODE_EL0t))

#define processor_mode(regs) \
((regs)->pstate & PSR_MODE_MASK)

#define interrupts_enabled(regs) \
(!((regs)->pstate & PSR_I_BIT))

#define fast_interrupts_enabled(regs) \
(!((regs)->pstate & PSR_F_BIT))

#define user_stack_pointer(regs) \
((regs)->sp)

/*
* Are the current registers suitable for user mode? (used to maintain
* security in signal handlers)
*/
static inline int valid_user_regs(struct user_pt_regs *regs)
{
if (user_mode(regs) && (regs->pstate & PSR_I_BIT) == 0) {
regs->pstate &= ~(PSR_F_BIT | PSR_A_BIT);

/* The T bit is reserved for AArch64 */
if (!(regs->pstate & PSR_MODE32_BIT))
regs->pstate &= ~COMPAT_PSR_T_BIT;

return 1;
}

/*
* Force PSR to something logical...
*/
regs->pstate &= PSR_f | PSR_s | (PSR_x & ~PSR_A_BIT) | \
COMPAT_PSR_T_BIT | PSR_MODE32_BIT;

if (!(regs->pstate & PSR_MODE32_BIT)) {
regs->pstate &= ~COMPAT_PSR_T_BIT;
regs->pstate |= PSR_MODE_EL0t;
}

return 0;
}

#define instruction_pointer(regs) (regs)->pc

#ifdef CONFIG_SMP
extern unsigned long profile_pc(struct pt_regs *regs);
#else
#define profile_pc(regs) instruction_pointer(regs)
#endif

#endif /* __ASSEMBLY__ */
#endif