diff options
Diffstat (limited to 'arch/arm/include/asm/syscall.h')
-rw-r--r-- | arch/arm/include/asm/syscall.h | 89 |
1 files changed, 89 insertions, 0 deletions
diff --git a/arch/arm/include/asm/syscall.h b/arch/arm/include/asm/syscall.h new file mode 100644 index 0000000000..fe4326d938 --- /dev/null +++ b/arch/arm/include/asm/syscall.h @@ -0,0 +1,89 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Access to user system call parameters and results + * + * See asm-generic/syscall.h for descriptions of what we must do here. + */ + +#ifndef _ASM_ARM_SYSCALL_H +#define _ASM_ARM_SYSCALL_H + +#include <uapi/linux/audit.h> /* for AUDIT_ARCH_* */ +#include <linux/elf.h> /* for ELF_EM */ +#include <linux/err.h> +#include <linux/sched.h> + +#include <asm/unistd.h> + +#define NR_syscalls (__NR_syscalls) + +extern const unsigned long sys_call_table[]; + +static inline int syscall_get_nr(struct task_struct *task, + struct pt_regs *regs) +{ + if (IS_ENABLED(CONFIG_AEABI) && !IS_ENABLED(CONFIG_OABI_COMPAT)) + return task_thread_info(task)->abi_syscall; + + if (task_thread_info(task)->abi_syscall == -1) + return -1; + + return task_thread_info(task)->abi_syscall & __NR_SYSCALL_MASK; +} + +static inline bool __in_oabi_syscall(struct task_struct *task) +{ + return IS_ENABLED(CONFIG_OABI_COMPAT) && + (task_thread_info(task)->abi_syscall & __NR_OABI_SYSCALL_BASE); +} + +static inline bool in_oabi_syscall(void) +{ + return __in_oabi_syscall(current); +} + +static inline void syscall_rollback(struct task_struct *task, + struct pt_regs *regs) +{ + regs->ARM_r0 = regs->ARM_ORIG_r0; +} + +static inline long syscall_get_error(struct task_struct *task, + struct pt_regs *regs) +{ + unsigned long error = regs->ARM_r0; + return IS_ERR_VALUE(error) ? error : 0; +} + +static inline long syscall_get_return_value(struct task_struct *task, + struct pt_regs *regs) +{ + return regs->ARM_r0; +} + +static inline void syscall_set_return_value(struct task_struct *task, + struct pt_regs *regs, + int error, long val) +{ + regs->ARM_r0 = (long) error ? error : val; +} + +#define SYSCALL_MAX_ARGS 7 + +static inline void syscall_get_arguments(struct task_struct *task, + struct pt_regs *regs, + unsigned long *args) +{ + args[0] = regs->ARM_ORIG_r0; + args++; + + memcpy(args, ®s->ARM_r0 + 1, 5 * sizeof(args[0])); +} + +static inline int syscall_get_arch(struct task_struct *task) +{ + /* ARM tasks don't change audit architectures on the fly. */ + return AUDIT_ARCH_ARM; +} + +#endif /* _ASM_ARM_SYSCALL_H */ |