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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/arch/microblaze/include/asm/syscall.h
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/* SPDX-License-Identifier: GPL-2.0 */

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#ifndef __ASM_MICROBLAZE_SYSCALL_H

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#define __ASM_MICROBLAZE_SYSCALL_H

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#include <uapi/linux/audit.h>

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#include <linux/kernel.h>

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#include <linux/sched.h>

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#include <asm/ptrace.h>

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/* The system call number is given by the user in R12 */

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static inline long syscall_get_nr(struct task_struct *task,

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				  struct pt_regs *regs)

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{

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	return regs->r12;

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}

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static inline void syscall_set_nr(struct task_struct *task,

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				  struct pt_regs *regs,

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				  int nr)

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{

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	regs->r12 = nr;

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}

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static inline void syscall_rollback(struct task_struct *task,

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				    struct pt_regs *regs)

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{

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	/* TODO.  */

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}

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static inline long syscall_get_error(struct task_struct *task,

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				     struct pt_regs *regs)

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{

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	return IS_ERR_VALUE(regs->r3) ? regs->r3 : 0;

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}

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static inline long syscall_get_return_value(struct task_struct *task,

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					    struct pt_regs *regs)

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{

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	return regs->r3;

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}

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static inline void syscall_set_return_value(struct task_struct *task,

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					    struct pt_regs *regs,

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					    int error, long val)

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{

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	if (error)

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		regs->r3 = -error;

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	else

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		regs->r3 = val;

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}

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static inline microblaze_reg_t microblaze_get_syscall_arg(struct pt_regs *regs,

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							  unsigned int n)

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{

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	switch (n) {

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	case 5: return regs->r10;

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	case 4: return regs->r9;

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	case 3: return regs->r8;

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	case 2: return regs->r7;

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	case 1: return regs->r6;

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	case 0: return regs->r5;

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	default:

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		BUG();

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	}

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	return ~0;

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}

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static inline void syscall_get_arguments(struct task_struct *task,

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					 struct pt_regs *regs,

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					 unsigned long *args)

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{

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	unsigned int i = 0;

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	unsigned int n = 6;

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	while (n--)

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		*args++ = microblaze_get_syscall_arg(regs, i++);

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}

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asmlinkage unsigned long do_syscall_trace_enter(struct pt_regs *regs);

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asmlinkage void do_syscall_trace_leave(struct pt_regs *regs);

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static inline int syscall_get_arch(struct task_struct *task)

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{

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	return AUDIT_ARCH_MICROBLAZE;

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}

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#endif /* __ASM_MICROBLAZE_SYSCALL_H */

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