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Diffstat (limited to 'arch/arm64/include/asm/syscall.h')
| -rw-r--r-- | arch/arm64/include/asm/syscall.h | 122 |
1 files changed, 122 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/syscall.h b/arch/arm64/include/asm/syscall.h new file mode 100644 index 000000000..709a57446 --- /dev/null +++ b/arch/arm64/include/asm/syscall.h @@ -0,0 +1,122 @@ +/* + * 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 */ |