syscall.h

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#ifndef __ASM_SPARC_SYSCALL_H
#define __ASM_SPARC_SYSCALL_H

#include <linux/kernel.h>
#include <linux/sched.h>
#include <asm/ptrace.h>

/*
 * The syscall table always contains 32 bit pointers since we know that the
 * address of the function to be called is (way) below 4GB.  So the "int"
 * type here is what we want [need] for both 32 bit and 64 bit systems.
 */
extern const unsigned int sys_call_table[];

/* The system call number is given by the user in %g1 */
static inline long syscall_get_nr(struct task_struct *task,
                  struct pt_regs *regs)
{
    int syscall_p = pt_regs_is_syscall(regs);

    return (syscall_p ? regs->u_regs[UREG_G1] : -1L);
}

static inline void syscall_rollback(struct task_struct *task,
                    struct pt_regs *regs)
{
    /* XXX This needs some thought.  On Sparc we don't
     * XXX save away the original %o0 value somewhere.
     * XXX Instead we hold it in register %l5 at the top
     * XXX level trap frame and pass this down to the signal
     * XXX dispatch code which is the only place that value
     * XXX ever was needed.
     */
}

#ifdef CONFIG_SPARC32
static inline bool syscall_has_error(struct pt_regs *regs)
{
    return (regs->psr & PSR_C) ? true : false;
}
static inline void syscall_set_error(struct pt_regs *regs)
{
    regs->psr |= PSR_C;
}
static inline void syscall_clear_error(struct pt_regs *regs)
{
    regs->psr &= ~PSR_C;
}
#else
static inline bool syscall_has_error(struct pt_regs *regs)
{
    return (regs->tstate & (TSTATE_XCARRY | TSTATE_ICARRY)) ? true : false;
}
static inline void syscall_set_error(struct pt_regs *regs)
{
    regs->tstate |= (TSTATE_XCARRY | TSTATE_ICARRY);
}
static inline void syscall_clear_error(struct pt_regs *regs)
{
    regs->tstate &= ~(TSTATE_XCARRY | TSTATE_ICARRY);
}
#endif

static inline long syscall_get_error(struct task_struct *task,
                     struct pt_regs *regs)
{
    long val = regs->u_regs[UREG_I0];

    return (syscall_has_error(regs) ? -val : 0);
}

static inline long syscall_get_return_value(struct task_struct *task,
                        struct pt_regs *regs)
{
    long val = regs->u_regs[UREG_I0];

    return val;
}

static inline void syscall_set_return_value(struct task_struct *task,
                        struct pt_regs *regs,
                        int error, long val)
{
    if (error) {
        syscall_set_error(regs);
        regs->u_regs[UREG_I0] = -error;
    } else {
        syscall_clear_error(regs);
        regs->u_regs[UREG_I0] = val;
    }
}

static inline void syscall_get_arguments(struct task_struct *task,
                     struct pt_regs *regs,
                     unsigned int i, unsigned int n,
                     unsigned long *args)
{
    int zero_extend = 0;
    unsigned int j;

#ifdef CONFIG_SPARC64
    if (test_tsk_thread_flag(task, TIF_32BIT))
        zero_extend = 1;
#endif

    for (j = 0; j < n; j++) {
        unsigned long val = regs->u_regs[UREG_I0 + i + j];

        if (zero_extend)
            args[j] = (u32) val;
        else
            args[j] = val;
    }
}

static inline void syscall_set_arguments(struct task_struct *task,
                     struct pt_regs *regs,
                     unsigned int i, unsigned int n,
                     const unsigned long *args)
{
    unsigned int j;

    for (j = 0; j < n; j++)
        regs->u_regs[UREG_I0 + i + j] = args[j];
}

#endif /* __ASM_SPARC_SYSCALL_H */