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32 results

dm-thin.c

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  • syscall.h 2.23 KiB
    /* SPDX-License-Identifier: GPL-2.0 */
    /*
     * Access to user system call parameters and results
     *
     *  Copyright IBM Corp. 2008
     *  Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com)
     */
    
    #ifndef _ASM_SYSCALL_H
    #define _ASM_SYSCALL_H	1
    
    #include <uapi/linux/audit.h>
    #include <linux/sched.h>
    #include <linux/err.h>
    #include <asm/ptrace.h>
    
    extern const unsigned long sys_call_table[];
    extern const unsigned long sys_call_table_emu[];
    
    static inline long syscall_get_nr(struct task_struct *task,
    				  struct pt_regs *regs)
    {
    	return test_pt_regs_flag(regs, PIF_SYSCALL) ?
    		(regs->int_code & 0xffff) : -1;
    }
    
    static inline void syscall_rollback(struct task_struct *task,
    				    struct pt_regs *regs)
    {
    	regs->gprs[2] = regs->orig_gpr2;
    }
    
    static inline long syscall_get_error(struct task_struct *task,
    				     struct pt_regs *regs)
    {
    	unsigned long error = regs->gprs[2];
    #ifdef CONFIG_COMPAT
    	if (test_tsk_thread_flag(task, TIF_31BIT)) {
    		/*
    		 * Sign-extend the value so (int)-EFOO becomes (long)-EFOO
    		 * and will match correctly in comparisons.
    		 */
    		error = (long)(int)error;
    	}
    #endif
    	return IS_ERR_VALUE(error) ? error : 0;
    }
    
    static inline long syscall_get_return_value(struct task_struct *task,
    					    struct pt_regs *regs)
    {
    	return regs->gprs[2];
    }
    
    static inline void syscall_set_return_value(struct task_struct *task,
    					    struct pt_regs *regs,
    					    int error, long val)
    {
    	regs->gprs[2] = error ? error : val;
    }
    
    static inline void syscall_get_arguments(struct task_struct *task,
    					 struct pt_regs *regs,
    					 unsigned long *args)
    {
    	unsigned long mask = -1UL;
    	unsigned int n = 6;
    
    #ifdef CONFIG_COMPAT
    	if (test_tsk_thread_flag(task, TIF_31BIT))
    		mask = 0xffffffff;
    #endif
    	while (n-- > 0)
    		if (n > 0)
    			args[n] = regs->gprs[2 + n] & mask;
    
    	args[0] = regs->orig_gpr2 & mask;
    }
    
    static inline void syscall_set_arguments(struct task_struct *task,
    					 struct pt_regs *regs,
    					 const unsigned long *args)
    {
    	unsigned int n = 6;
    
    	while (n-- > 0)
    		if (n > 0)
    			regs->gprs[2 + n] = args[n];
    	regs->orig_gpr2 = args[0];
    }
    
    static inline int syscall_get_arch(struct task_struct *task)
    {
    #ifdef CONFIG_COMPAT
    	if (test_tsk_thread_flag(task, TIF_31BIT))
    		return AUDIT_ARCH_S390;
    #endif
    	return AUDIT_ARCH_S390X;
    }
    #endif	/* _ASM_SYSCALL_H */