/* * Copyright (C) 2012 ARM Ltd. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see <http://www.gnu.org/licenses/>. */ #ifndef __ASM_SYSCALL_H #define __ASM_SYSCALL_H #include <uapi/linux/audit.h> #include <linux/compat.h> #include <linux/err.h> extern const void *sys_call_table[]; static inline int syscall_get_nr(struct task_struct *task, struct pt_regs *regs) { return regs->syscallno; } static inline void syscall_rollback(struct task_struct *task, struct pt_regs *regs) { regs->regs[0] = regs->orig_x0; } static inline long syscall_get_error(struct task_struct *task, struct pt_regs *regs) { unsigned long error = regs->regs[0]; return IS_ERR_VALUE(error) ? error : 0; } static inline long syscall_get_return_value(struct task_struct *task, struct pt_regs *regs) { return regs->regs[0]; } static inline void syscall_set_return_value(struct task_struct *task, struct pt_regs *regs, int error, long val) { regs->regs[0] = (long) error ? error : val; } #define SYSCALL_MAX_ARGS 6 static inline void syscall_get_arguments(struct task_struct *task, struct pt_regs *regs, unsigned int i, unsigned int n, unsigned long *args) { if (n == 0) return; if (i + n > SYSCALL_MAX_ARGS) { unsigned long *args_bad = args + SYSCALL_MAX_ARGS - i; unsigned int n_bad = n + i - SYSCALL_MAX_ARGS; pr_warning("%s called with max args %d, handling only %d\n", __func__, i + n, SYSCALL_MAX_ARGS); memset(args_bad, 0, n_bad * sizeof(args[0])); } if (i == 0) { args[0] = regs->orig_x0; args++; i++; n--; } memcpy(args, ®s->regs[i], n * sizeof(args[0])); } static inline void syscall_set_arguments(struct task_struct *task, struct pt_regs *regs, unsigned int i, unsigned int n, const unsigned long *args) { if (n == 0) return; if (i + n > SYSCALL_MAX_ARGS) { pr_warning("%s called with max args %d, handling only %d\n", __func__, i + n, SYSCALL_MAX_ARGS); n = SYSCALL_MAX_ARGS - i; } if (i == 0) { regs->orig_x0 = args[0]; args++; i++; n--; } memcpy(®s->regs[i], args, n * sizeof(args[0])); } /* * We don't care about endianness (__AUDIT_ARCH_LE bit) here because * AArch64 has the same system calls both on little- and big- endian. */ static inline int syscall_get_arch(void) { if (is_compat_task()) return AUDIT_ARCH_ARM; return AUDIT_ARCH_AARCH64; } #endif /* __ASM_SYSCALL_H */