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| 2 | |
| 3 | * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
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| 4 |
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| 5 |
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| 6 | #ifndef _ASM_ARC_SYSCALL_H
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| 7 | #define _ASM_ARC_SYSCALL_H 1
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| 8 |
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| 9 | #include <uapi/linux/audit.h>
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| 10 | #include <linux/err.h>
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| 11 | #include <linux/sched.h>
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| 12 | #include <asm/unistd.h>
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| 13 | #include <asm/ptrace.h>
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| 14 |
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| 15 | extern void *sys_call_table[];
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| 16 |
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| 17 | static inline long
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| 18 | syscall_get_nr(struct task_struct *task, struct pt_regs *regs)
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| 19 | {
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| 20 | if (user_mode(regs) && in_syscall(regs))
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| 21 | return regs->r8;
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| 22 | else
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| 23 | return -1;
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| 24 | }
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| 25 |
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| 26 | static inline void
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| 27 | syscall_set_nr(struct task_struct *task, struct pt_regs *regs, int nr)
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| 28 | {
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| 29 | |
| 30 | * Unlike syscall_get_nr(), syscall_set_nr() can be called only when
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| 31 | * the target task is stopped for tracing on entering syscall, so
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| 32 | * there is no need to have the same check syscall_get_nr() has.
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| 33 |
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| 34 | regs->r8 = nr;
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| 35 | }
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| 36 |
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| 37 | static inline void
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| 38 | syscall_rollback(struct task_struct *task, struct pt_regs *regs)
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| 39 | {
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| 40 | regs->r0 = regs->orig_r0;
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| 41 | }
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| 42 |
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| 43 | static inline long
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| 44 | syscall_get_error(struct task_struct *task, struct pt_regs *regs)
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| 45 | {
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| 46 |
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| 47 | return IS_ERR_VALUE(regs->r0) ? regs->r0 : 0;
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| 48 | }
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| 49 |
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| 50 | static inline long
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| 51 | syscall_get_return_value(struct task_struct *task, struct pt_regs *regs)
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| 52 | {
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| 53 | return regs->r0;
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| 54 | }
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| 55 |
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| 56 | static inline void
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| 57 | syscall_set_return_value(struct task_struct *task, struct pt_regs *regs,
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| 58 | int error, long val)
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| 59 | {
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| 60 | regs->r0 = (long) error ?: val;
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| 61 | }
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| 62 |
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| 63 | |
| 64 | * @i: argument index [0,5]
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| 65 | * @n: number of arguments; n+i must be [1,6].
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| 66 |
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| 67 | static inline void
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| 68 | syscall_get_arguments(struct task_struct *task, struct pt_regs *regs,
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| 69 | unsigned long *args)
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| 70 | {
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| 71 | unsigned long *inside_ptregs = &(regs->r0);
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| 72 | unsigned int n = 6;
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| 73 | unsigned int i = 0;
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| 74 |
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| 75 | while (n--) {
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| 76 | args[i++] = (*inside_ptregs);
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| 77 | inside_ptregs--;
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| 78 | }
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| 79 | }
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| 80 |
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| 81 | static inline void
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| 82 | syscall_set_arguments(struct task_struct *task, struct pt_regs *regs,
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| 83 | unsigned long *args)
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| 84 | {
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| 85 | unsigned long *inside_ptregs = ®s->r0;
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| 86 | unsigned int n = 6;
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| 87 | unsigned int i = 0;
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| 88 |
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| 89 | while (n--) {
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| 90 | *inside_ptregs = args[i++];
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| 91 | inside_ptregs--;
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| 92 | }
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| 93 | }
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| 94 |
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| 95 | static inline int
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| 96 | syscall_get_arch(struct task_struct *task)
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| 97 | {
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| 98 | return IS_ENABLED(CONFIG_ISA_ARCOMPACT)
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| 99 | ? (IS_ENABLED(CONFIG_CPU_BIG_ENDIAN)
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| 100 | ? AUDIT_ARCH_ARCOMPACTBE : AUDIT_ARCH_ARCOMPACT)
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| 101 | : (IS_ENABLED(CONFIG_CPU_BIG_ENDIAN)
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| 102 | ? AUDIT_ARCH_ARCV2BE : AUDIT_ARCH_ARCV2);
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| 103 | }
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| 104 |
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| 105 | #endif
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