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/* ARC system call interface */

/* A special version of the flag insn is used to distinguish syscalls from

   breakpoints (a breakpoint might be set at the same place).

   The upper 23 bits of the argument to a flag insn are not currently used.

   By convention, bit 31 is one to indicate this is a specially coded operand.

   The next 15 bits (bits 30-16) can be used for software purposes.

   The format isn't documented yet, so the pattern we use here may change.  */

#define SYSCALL_MARKER 0x80010000

#define SYSCALL_MAGIC 0x61082300

/* Perform a system call.

   If ERR is 0, it succeeded.  Otherwise it is a positive value for errno.  */

#define SYSCALL(op, rc, err, r0, r1, r2) \

asm volatile ( "\

              mov r0,%2\n\t \

              mov r1,%3\n\t \

              mov r2,%4\n\t \

              mov r3,%5\n\t \

              mov r4,%6\n\t \

              flag %7\n\t \

              nop\n\t \

              nop\n\t \

              nop\n\t \

              mov %0,r0\n\t \

              mov %1,r1" \

              : "=r" (rc), "=r" (err) \

              : "i" (SYSCALL_MAGIC), "r" (op), "r" (r0), "r" (r1), "r" (r2), \

                "i" (1 | SYSCALL_MARKER) \

              : "r0", "r1", "r2", "r3", "r4");

#define SYS_exit        1

#define SYS_open        2

#define SYS_close       3

#define SYS_read        4

#define SYS_write       5

#define SYS_lseek       6

#define SYS_link        7

#define SYS_unlink      8

#define SYS_chdir       9

#define SYS_chmod       10

#define SYS_stat        11

#define SYS_fstat       12

#define SYS_access      13

#define SYS_getpid      14

#define SYS_kill        15

#define SYS_time        16

#define SYS_MAX         17