1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * Access to user system call parameters and results 4 * 5 * See asm-generic/syscall.h for descriptions of what we must do here. 6 */ 7 8 #ifndef _ASM_ARM_SYSCALL_H 9 #define _ASM_ARM_SYSCALL_H 10 11 #include <uapi/linux/audit.h> /* for AUDIT_ARCH_* */ 12 #include <linux/elf.h> /* for ELF_EM */ 13 #include <linux/err.h> 14 #include <linux/sched.h> 15 16 #include <asm/unistd.h> 17 18 #define NR_syscalls (__NR_syscalls) 19 20 extern const unsigned long sys_call_table[]; 21 22 static inline int syscall_get_nr(struct task_struct *task, 23 struct pt_regs *regs) 24 { 25 if (IS_ENABLED(CONFIG_AEABI) && !IS_ENABLED(CONFIG_OABI_COMPAT)) 26 return task_thread_info(task)->abi_syscall; 27 28 return task_thread_info(task)->abi_syscall & __NR_SYSCALL_MASK; 29 } 30 31 static inline bool __in_oabi_syscall(struct task_struct *task) 32 { 33 return IS_ENABLED(CONFIG_OABI_COMPAT) && 34 (task_thread_info(task)->abi_syscall & __NR_OABI_SYSCALL_BASE); 35 } 36 37 static inline bool in_oabi_syscall(void) 38 { 39 return __in_oabi_syscall(current); 40 } 41 42 static inline void syscall_rollback(struct task_struct *task, 43 struct pt_regs *regs) 44 { 45 regs->ARM_r0 = regs->ARM_ORIG_r0; 46 } 47 48 static inline long syscall_get_error(struct task_struct *task, 49 struct pt_regs *regs) 50 { 51 unsigned long error = regs->ARM_r0; 52 return IS_ERR_VALUE(error) ? error : 0; 53 } 54 55 static inline long syscall_get_return_value(struct task_struct *task, 56 struct pt_regs *regs) 57 { 58 return regs->ARM_r0; 59 } 60 61 static inline void syscall_set_return_value(struct task_struct *task, 62 struct pt_regs *regs, 63 int error, long val) 64 { 65 regs->ARM_r0 = (long) error ? error : val; 66 } 67 68 #define SYSCALL_MAX_ARGS 7 69 70 static inline void syscall_get_arguments(struct task_struct *task, 71 struct pt_regs *regs, 72 unsigned long *args) 73 { 74 args[0] = regs->ARM_ORIG_r0; 75 args++; 76 77 memcpy(args, ®s->ARM_r0 + 1, 5 * sizeof(args[0])); 78 } 79 80 static inline int syscall_get_arch(struct task_struct *task) 81 { 82 /* ARM tasks don't change audit architectures on the fly. */ 83 return AUDIT_ARCH_ARM; 84 } 85 86 #endif /* _ASM_ARM_SYSCALL_H */ 87