libsel4utils/arch_include/arm/sel4utils/arch/util.h

/*
 * Copyright 2014, NICTA
 *
 * This software may be distributed and modified according to the terms of
 * the BSD 2-Clause license. Note that NO WARRANTY is provided.
 * See "LICENSE_BSD2.txt" for details.
 *
 * @TAG(NICTA_BSD)
 */
#ifndef _SEL4UTILS_ARCH_UTIL_H
#define _SEL4UTILS_ARCH_UTIL_H

#include <sel4/sel4.h>
#include <sel4/arch/pfIPC.h>
#include <sel4/arch/exIPC.h>

#define EXCEPT_IPC_SYS_MR_IP EXCEPT_IPC_SYS_MR_PC

static inline int
sel4utils_is_read_fault(void)
{
    seL4_Word fsr = seL4_GetMR(SEL4_PFIPC_FSR);
#if defined(ARM_HYP)
    return (fsr & (1 << 6)) == 0;
#else
    return (fsr & (1 << 11)) == 0;
#endif
}


static inline void
sel4utils_set_instruction_pointer(seL4_UserContext *regs, seL4_Word value)
{
    regs->pc = value;
}

static inline seL4_Word
sel4utils_get_instruction_pointer(seL4_UserContext regs)
{
    return regs.pc;
}

static inline void
sel4utils_set_stack_pointer(seL4_UserContext *regs, seL4_Word value)
{
    regs->sp = value;
}

static inline void
sel4utils_set_arg0(seL4_UserContext *regs, seL4_Word value)
{
    regs->r0 = value;
}

static inline seL4_Word
sel4utils_get_sp(seL4_UserContext regs)
{
    return regs.sp;
}

#endif /* _SEL4UTILS_ARCH_UTIL_H */