139 lines
3.2 KiB
C
139 lines
3.2 KiB
C
/*
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* Copyright (C) 2012 ARM Ltd.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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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 int i, unsigned int n,
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unsigned long *args)
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{
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if (n == 0)
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return;
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if (i + n > SYSCALL_MAX_ARGS) {
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unsigned long *args_bad = args + SYSCALL_MAX_ARGS - i;
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unsigned int n_bad = n + i - SYSCALL_MAX_ARGS;
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pr_warning("%s called with max args %d, handling only %d\n",
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__func__, i + n, SYSCALL_MAX_ARGS);
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memset(args_bad, 0, n_bad * sizeof(args[0]));
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}
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if (i == 0) {
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args[0] = regs->orig_x0;
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args++;
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i++;
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n--;
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}
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memcpy(args, ®s->regs[i], n * 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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unsigned int i, unsigned int n,
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const unsigned long *args)
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{
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if (n == 0)
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return;
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if (i + n > SYSCALL_MAX_ARGS) {
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pr_warning("%s called with max args %d, handling only %d\n",
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__func__, i + n, SYSCALL_MAX_ARGS);
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n = SYSCALL_MAX_ARGS - i;
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}
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if (i == 0) {
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regs->orig_x0 = args[0];
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args++;
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i++;
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n--;
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}
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memcpy(®s->regs[i], args, n * 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(void)
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{
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if (is_compat_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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