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/* * Magic syscall break down functions * * Copyright 2010 Analog Devices Inc. * * Licensed under the GPL-2 or later. */ #ifndef __ASM_BLACKFIN_SYSCALL_H__ #define __ASM_BLACKFIN_SYSCALL_H__ /* * Blackfin syscalls are simple: * enter: * p0: syscall number * r{0,1,2,3,4,5}: syscall args 0,1,2,3,4,5 * exit: * r0: return/error value */ #include <linux/err.h> #include <linux/sched.h> #include <asm/ptrace.h> static inline long syscall_get_nr(struct task_struct *task, struct pt_regs *regs) { return regs->p0; } static inline void syscall_rollback(struct task_struct *task, struct pt_regs *regs) { regs->p0 = regs->orig_p0; } static inline long syscall_get_error(struct task_struct *task, struct pt_regs *regs) { return IS_ERR_VALUE(regs->r0) ? regs->r0 : 0; } static inline long syscall_get_return_value(struct task_struct *task, struct pt_regs *regs) { return regs->r0; } static inline void syscall_set_return_value(struct task_struct *task, struct pt_regs *regs, int error, long val) { regs->r0 = error ? -error : val; } /** * syscall_get_arguments() * @task: unused * @regs: the register layout to extract syscall arguments from * @i: first syscall argument to extract * @n: number of syscall arguments to extract * @args: array to return the syscall arguments in * * args[0] gets i'th argument, args[n - 1] gets the i+n-1'th argument */ static inline void syscall_get_arguments(struct task_struct *task, struct pt_regs *regs, unsigned int i, unsigned int n, unsigned long *args) { /* * Assume the ptrace layout doesn't change -- r5 is first in memory, * then r4, ..., then r0. So we simply reverse the ptrace register * array in memory to store into the args array. */ long *aregs = ®s->r0 - i; BUG_ON(i > 5 || i + n > 6); while (n--) *args++ = *aregs--; } /* See syscall_get_arguments() comments */ static inline void syscall_set_arguments(struct task_struct *task, struct pt_regs *regs, unsigned int i, unsigned int n, const unsigned long *args) { long *aregs = ®s->r0 - i; BUG_ON(i > 5 || i + n > 6); while (n--) *aregs-- = *args++; } #endif