1bf2c9f98SWade Farnsworth /* 2bf2c9f98SWade Farnsworth * Access to user system call parameters and results 3bf2c9f98SWade Farnsworth * 4bf2c9f98SWade Farnsworth * See asm-generic/syscall.h for descriptions of what we must do here. 5bf2c9f98SWade Farnsworth */ 6bf2c9f98SWade Farnsworth 7bf2c9f98SWade Farnsworth #ifndef _ASM_ARM_SYSCALL_H 8bf2c9f98SWade Farnsworth #define _ASM_ARM_SYSCALL_H 9bf2c9f98SWade Farnsworth 10bf2c9f98SWade Farnsworth #include <linux/err.h> 11bf2c9f98SWade Farnsworth 121f66e06fSWade Farnsworth #include <asm/unistd.h> 131f66e06fSWade Farnsworth 141f66e06fSWade Farnsworth #define NR_syscalls (__NR_syscalls) 151f66e06fSWade Farnsworth 16bf2c9f98SWade Farnsworth extern const unsigned long sys_call_table[]; 17bf2c9f98SWade Farnsworth 18bf2c9f98SWade Farnsworth static inline int syscall_get_nr(struct task_struct *task, 19bf2c9f98SWade Farnsworth struct pt_regs *regs) 20bf2c9f98SWade Farnsworth { 21bf2c9f98SWade Farnsworth return task_thread_info(task)->syscall; 22bf2c9f98SWade Farnsworth } 23bf2c9f98SWade Farnsworth 24bf2c9f98SWade Farnsworth static inline void syscall_rollback(struct task_struct *task, 25bf2c9f98SWade Farnsworth struct pt_regs *regs) 26bf2c9f98SWade Farnsworth { 27bf2c9f98SWade Farnsworth regs->ARM_r0 = regs->ARM_ORIG_r0; 28bf2c9f98SWade Farnsworth } 29bf2c9f98SWade Farnsworth 30bf2c9f98SWade Farnsworth static inline long syscall_get_error(struct task_struct *task, 31bf2c9f98SWade Farnsworth struct pt_regs *regs) 32bf2c9f98SWade Farnsworth { 33bf2c9f98SWade Farnsworth unsigned long error = regs->ARM_r0; 34bf2c9f98SWade Farnsworth return IS_ERR_VALUE(error) ? error : 0; 35bf2c9f98SWade Farnsworth } 36bf2c9f98SWade Farnsworth 37bf2c9f98SWade Farnsworth static inline long syscall_get_return_value(struct task_struct *task, 38bf2c9f98SWade Farnsworth struct pt_regs *regs) 39bf2c9f98SWade Farnsworth { 40bf2c9f98SWade Farnsworth return regs->ARM_r0; 41bf2c9f98SWade Farnsworth } 42bf2c9f98SWade Farnsworth 43bf2c9f98SWade Farnsworth static inline void syscall_set_return_value(struct task_struct *task, 44bf2c9f98SWade Farnsworth struct pt_regs *regs, 45bf2c9f98SWade Farnsworth int error, long val) 46bf2c9f98SWade Farnsworth { 47bf2c9f98SWade Farnsworth regs->ARM_r0 = (long) error ? error : val; 48bf2c9f98SWade Farnsworth } 49bf2c9f98SWade Farnsworth 50bf2c9f98SWade Farnsworth #define SYSCALL_MAX_ARGS 7 51bf2c9f98SWade Farnsworth 52bf2c9f98SWade Farnsworth static inline void syscall_get_arguments(struct task_struct *task, 53bf2c9f98SWade Farnsworth struct pt_regs *regs, 54bf2c9f98SWade Farnsworth unsigned int i, unsigned int n, 55bf2c9f98SWade Farnsworth unsigned long *args) 56bf2c9f98SWade Farnsworth { 57bf2c9f98SWade Farnsworth if (i + n > SYSCALL_MAX_ARGS) { 58bf2c9f98SWade Farnsworth unsigned long *args_bad = args + SYSCALL_MAX_ARGS - i; 59bf2c9f98SWade Farnsworth unsigned int n_bad = n + i - SYSCALL_MAX_ARGS; 60bf2c9f98SWade Farnsworth pr_warning("%s called with max args %d, handling only %d\n", 61bf2c9f98SWade Farnsworth __func__, i + n, SYSCALL_MAX_ARGS); 62bf2c9f98SWade Farnsworth memset(args_bad, 0, n_bad * sizeof(args[0])); 63bf2c9f98SWade Farnsworth n = SYSCALL_MAX_ARGS - i; 64bf2c9f98SWade Farnsworth } 65bf2c9f98SWade Farnsworth 66bf2c9f98SWade Farnsworth if (i == 0) { 67bf2c9f98SWade Farnsworth args[0] = regs->ARM_ORIG_r0; 68bf2c9f98SWade Farnsworth args++; 69bf2c9f98SWade Farnsworth i++; 70bf2c9f98SWade Farnsworth n--; 71bf2c9f98SWade Farnsworth } 72bf2c9f98SWade Farnsworth 73bf2c9f98SWade Farnsworth memcpy(args, ®s->ARM_r0 + i, n * sizeof(args[0])); 74bf2c9f98SWade Farnsworth } 75bf2c9f98SWade Farnsworth 76bf2c9f98SWade Farnsworth static inline void syscall_set_arguments(struct task_struct *task, 77bf2c9f98SWade Farnsworth struct pt_regs *regs, 78bf2c9f98SWade Farnsworth unsigned int i, unsigned int n, 79bf2c9f98SWade Farnsworth const unsigned long *args) 80bf2c9f98SWade Farnsworth { 81bf2c9f98SWade Farnsworth if (i + n > SYSCALL_MAX_ARGS) { 82bf2c9f98SWade Farnsworth pr_warning("%s called with max args %d, handling only %d\n", 83bf2c9f98SWade Farnsworth __func__, i + n, SYSCALL_MAX_ARGS); 84bf2c9f98SWade Farnsworth n = SYSCALL_MAX_ARGS - i; 85bf2c9f98SWade Farnsworth } 86bf2c9f98SWade Farnsworth 87bf2c9f98SWade Farnsworth if (i == 0) { 88bf2c9f98SWade Farnsworth regs->ARM_ORIG_r0 = args[0]; 89bf2c9f98SWade Farnsworth args++; 90bf2c9f98SWade Farnsworth i++; 91bf2c9f98SWade Farnsworth n--; 92bf2c9f98SWade Farnsworth } 93bf2c9f98SWade Farnsworth 94bf2c9f98SWade Farnsworth memcpy(®s->ARM_r0 + i, args, n * sizeof(args[0])); 95bf2c9f98SWade Farnsworth } 96bf2c9f98SWade Farnsworth 97bf2c9f98SWade Farnsworth #endif /* _ASM_ARM_SYSCALL_H */ 98