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97 lines
2.1 KiB
97 lines
2.1 KiB
/* SPDX-License-Identifier: GPL-2.0-only */ |
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/* |
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* Copyright (C) 2012 ARM Ltd. |
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*/ |
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#ifndef __ASM_SYSCALL_H |
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#define __ASM_SYSCALL_H |
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#include <uapi/linux/audit.h> |
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#include <linux/compat.h> |
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#include <linux/err.h> |
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typedef long (*syscall_fn_t)(const struct pt_regs *regs); |
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extern const syscall_fn_t sys_call_table[]; |
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#ifdef CONFIG_COMPAT |
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extern const syscall_fn_t compat_sys_call_table[]; |
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#endif |
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static inline int 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->syscallno; |
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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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regs->regs[0] = regs->orig_x0; |
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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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unsigned long error = regs->regs[0]; |
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if (is_compat_thread(task_thread_info(task))) |
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error = sign_extend64(error, 31); |
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return IS_ERR_VALUE(error) ? error : 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->regs[0]; |
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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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val = error; |
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if (is_compat_thread(task_thread_info(task))) |
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val = lower_32_bits(val); |
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regs->regs[0] = val; |
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} |
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#define SYSCALL_MAX_ARGS 6 |
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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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args[0] = regs->orig_x0; |
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args++; |
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memcpy(args, ®s->regs[1], 5 * sizeof(args[0])); |
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} |
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static inline void syscall_set_arguments(struct task_struct *task, |
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struct pt_regs *regs, |
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const unsigned long *args) |
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{ |
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regs->orig_x0 = args[0]; |
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args++; |
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memcpy(®s->regs[1], args, 5 * sizeof(args[0])); |
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} |
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/* |
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* We don't care about endianness (__AUDIT_ARCH_LE bit) here because |
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* AArch64 has the same system calls both on little- and big- endian. |
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*/ |
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static inline int syscall_get_arch(struct task_struct *task) |
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{ |
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if (is_compat_thread(task_thread_info(task))) |
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return AUDIT_ARCH_ARM; |
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return AUDIT_ARCH_AARCH64; |
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} |
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#endif /* __ASM_SYSCALL_H */
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