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Linux/arch/arm/include/asm/syscall.h

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  1 /*
  2  * Access to user system call parameters and results
  3  *
  4  * See asm-generic/syscall.h for descriptions of what we must do here.
  5  */
  6 
  7 #ifndef _ASM_ARM_SYSCALL_H
  8 #define _ASM_ARM_SYSCALL_H
  9 
 10 #include <linux/audit.h> /* for AUDIT_ARCH_* */
 11 #include <linux/elf.h> /* for ELF_EM */
 12 #include <linux/err.h>
 13 #include <linux/sched.h>
 14 
 15 #include <asm/unistd.h>
 16 
 17 #define NR_syscalls (__NR_syscalls)
 18 
 19 extern const unsigned long sys_call_table[];
 20 
 21 static inline int syscall_get_nr(struct task_struct *task,
 22                                  struct pt_regs *regs)
 23 {
 24         return task_thread_info(task)->syscall;
 25 }
 26 
 27 static inline void syscall_rollback(struct task_struct *task,
 28                                     struct pt_regs *regs)
 29 {
 30         regs->ARM_r0 = regs->ARM_ORIG_r0;
 31 }
 32 
 33 static inline long syscall_get_error(struct task_struct *task,
 34                                      struct pt_regs *regs)
 35 {
 36         unsigned long error = regs->ARM_r0;
 37         return IS_ERR_VALUE(error) ? error : 0;
 38 }
 39 
 40 static inline long syscall_get_return_value(struct task_struct *task,
 41                                             struct pt_regs *regs)
 42 {
 43         return regs->ARM_r0;
 44 }
 45 
 46 static inline void syscall_set_return_value(struct task_struct *task,
 47                                             struct pt_regs *regs,
 48                                             int error, long val)
 49 {
 50         regs->ARM_r0 = (long) error ? error : val;
 51 }
 52 
 53 #define SYSCALL_MAX_ARGS 7
 54 
 55 static inline void syscall_get_arguments(struct task_struct *task,
 56                                          struct pt_regs *regs,
 57                                          unsigned int i, unsigned int n,
 58                                          unsigned long *args)
 59 {
 60         if (n == 0)
 61                 return;
 62 
 63         if (i + n > SYSCALL_MAX_ARGS) {
 64                 unsigned long *args_bad = args + SYSCALL_MAX_ARGS - i;
 65                 unsigned int n_bad = n + i - SYSCALL_MAX_ARGS;
 66                 pr_warning("%s called with max args %d, handling only %d\n",
 67                            __func__, i + n, SYSCALL_MAX_ARGS);
 68                 memset(args_bad, 0, n_bad * sizeof(args[0]));
 69                 n = SYSCALL_MAX_ARGS - i;
 70         }
 71 
 72         if (i == 0) {
 73                 args[0] = regs->ARM_ORIG_r0;
 74                 args++;
 75                 i++;
 76                 n--;
 77         }
 78 
 79         memcpy(args, &regs->ARM_r0 + i, n * sizeof(args[0]));
 80 }
 81 
 82 static inline void syscall_set_arguments(struct task_struct *task,
 83                                          struct pt_regs *regs,
 84                                          unsigned int i, unsigned int n,
 85                                          const unsigned long *args)
 86 {
 87         if (n == 0)
 88                 return;
 89 
 90         if (i + n > SYSCALL_MAX_ARGS) {
 91                 pr_warning("%s called with max args %d, handling only %d\n",
 92                            __func__, i + n, SYSCALL_MAX_ARGS);
 93                 n = SYSCALL_MAX_ARGS - i;
 94         }
 95 
 96         if (i == 0) {
 97                 regs->ARM_ORIG_r0 = args[0];
 98                 args++;
 99                 i++;
100                 n--;
101         }
102 
103         memcpy(&regs->ARM_r0 + i, args, n * sizeof(args[0]));
104 }
105 
106 static inline int syscall_get_arch(struct task_struct *task,
107                                    struct pt_regs *regs)
108 {
109         /* ARM tasks don't change audit architectures on the fly. */
110         return AUDIT_ARCH_ARM;
111 }
112 
113 #endif /* _ASM_ARM_SYSCALL_H */
114 

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