| 1 |
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| 2 | |
| 3 | * Access to user system call parameters and results
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| 4 | *
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| 5 | * See asm-generic/syscall.h for function descriptions.
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| 6 | *
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| 7 | * Copyright (C) 2015 Mickaël Salaün <[email protected]>
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| 8 |
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| 9 |
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| 10 | #ifndef __UM_SYSCALL_GENERIC_H
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| 11 | #define __UM_SYSCALL_GENERIC_H
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| 12 |
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| 13 | #include <asm/ptrace.h>
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| 14 | #include <linux/err.h>
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| 15 | #include <linux/sched.h>
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| 16 | #include <sysdep/ptrace.h>
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| 17 |
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| 18 | static inline int syscall_get_nr(struct task_struct *task, struct pt_regs *regs)
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| 19 | {
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| 20 |
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| 21 | return PT_REGS_SYSCALL_NR(regs);
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| 22 | }
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| 23 |
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| 24 | static inline void syscall_set_nr(struct task_struct *task, struct pt_regs *regs, int nr)
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| 25 | {
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| 26 | PT_REGS_SYSCALL_NR(regs) = nr;
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| 27 | }
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| 28 |
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| 29 | static inline void syscall_rollback(struct task_struct *task,
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| 30 | struct pt_regs *regs)
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| 31 | {
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| 32 |
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| 33 | }
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| 34 |
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| 35 | static inline long syscall_get_error(struct task_struct *task,
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| 36 | struct pt_regs *regs)
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| 37 | {
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| 38 | const long error = regs_return_value(regs);
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| 39 |
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| 40 | return IS_ERR_VALUE(error) ? error : 0;
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| 41 | }
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| 42 |
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| 43 | static inline long syscall_get_return_value(struct task_struct *task,
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| 44 | struct pt_regs *regs)
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| 45 | {
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| 46 | return regs_return_value(regs);
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| 47 | }
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| 48 |
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| 49 | static inline void syscall_set_return_value(struct task_struct *task,
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| 50 | struct pt_regs *regs,
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| 51 | int error, long val)
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| 52 | {
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| 53 | PT_REGS_SET_SYSCALL_RETURN(regs, (long) error ?: val);
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| 54 | }
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| 55 |
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| 56 | static inline void syscall_get_arguments(struct task_struct *task,
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| 57 | struct pt_regs *regs,
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| 58 | unsigned long *args)
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| 59 | {
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| 60 | const struct uml_pt_regs *r = ®s->regs;
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| 61 |
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| 62 | *args++ = UPT_SYSCALL_ARG1(r);
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| 63 | *args++ = UPT_SYSCALL_ARG2(r);
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| 64 | *args++ = UPT_SYSCALL_ARG3(r);
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| 65 | *args++ = UPT_SYSCALL_ARG4(r);
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| 66 | *args++ = UPT_SYSCALL_ARG5(r);
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| 67 | *args = UPT_SYSCALL_ARG6(r);
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| 68 | }
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| 69 |
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| 70 | static inline void syscall_set_arguments(struct task_struct *task,
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| 71 | struct pt_regs *regs,
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| 72 | const unsigned long *args)
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| 73 | {
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| 74 | struct uml_pt_regs *r = ®s->regs;
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| 75 |
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| 76 | UPT_SYSCALL_ARG1(r) = *args++;
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| 77 | UPT_SYSCALL_ARG2(r) = *args++;
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| 78 | UPT_SYSCALL_ARG3(r) = *args++;
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| 79 | UPT_SYSCALL_ARG4(r) = *args++;
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| 80 | UPT_SYSCALL_ARG5(r) = *args++;
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| 81 | UPT_SYSCALL_ARG6(r) = *args;
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| 82 | }
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| 83 |
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| 84 |
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| 85 |
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| 86 | #endif
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