/* ARC system call interface */
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/* ARC system call interface */
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/* A special version of the flag insn is used to distinguish syscalls from
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/* A special version of the flag insn is used to distinguish syscalls from
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breakpoints (a breakpoint might be set at the same place).
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breakpoints (a breakpoint might be set at the same place).
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The upper 23 bits of the argument to a flag insn are not currently used.
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The upper 23 bits of the argument to a flag insn are not currently used.
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By convention, bit 31 is one to indicate this is a specially coded operand.
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By convention, bit 31 is one to indicate this is a specially coded operand.
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The next 15 bits (bits 30-16) can be used for software purposes.
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The next 15 bits (bits 30-16) can be used for software purposes.
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The format isn't documented yet, so the pattern we use here may change. */
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The format isn't documented yet, so the pattern we use here may change. */
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#define SYSCALL_MARKER 0x80010000
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#define SYSCALL_MARKER 0x80010000
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#define SYSCALL_MAGIC 0x61082300
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#define SYSCALL_MAGIC 0x61082300
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/* Perform a system call.
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/* Perform a system call.
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If ERR is 0, it succeeded. Otherwise it is a positive value for errno. */
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If ERR is 0, it succeeded. Otherwise it is a positive value for errno. */
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#define SYSCALL(op, rc, err, r0, r1, r2) \
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#define SYSCALL(op, rc, err, r0, r1, r2) \
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asm volatile ( "\
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asm volatile ( "\
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mov r0,%2\n\t \
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mov r0,%2\n\t \
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mov r1,%3\n\t \
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mov r1,%3\n\t \
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mov r2,%4\n\t \
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mov r2,%4\n\t \
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mov r3,%5\n\t \
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mov r3,%5\n\t \
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mov r4,%6\n\t \
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mov r4,%6\n\t \
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flag %7\n\t \
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flag %7\n\t \
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nop\n\t \
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nop\n\t \
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nop\n\t \
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nop\n\t \
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nop\n\t \
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nop\n\t \
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mov %0,r0\n\t \
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mov %0,r0\n\t \
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mov %1,r1" \
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mov %1,r1" \
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: "=r" (rc), "=r" (err) \
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: "=r" (rc), "=r" (err) \
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: "i" (SYSCALL_MAGIC), "r" (op), "r" (r0), "r" (r1), "r" (r2), \
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: "i" (SYSCALL_MAGIC), "r" (op), "r" (r0), "r" (r1), "r" (r2), \
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"i" (1 | SYSCALL_MARKER) \
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"i" (1 | SYSCALL_MARKER) \
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: "r0", "r1", "r2", "r3", "r4");
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: "r0", "r1", "r2", "r3", "r4");
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#define SYS_exit 1
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#define SYS_exit 1
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#define SYS_open 2
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#define SYS_open 2
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#define SYS_close 3
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#define SYS_close 3
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#define SYS_read 4
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#define SYS_read 4
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#define SYS_write 5
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#define SYS_write 5
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#define SYS_lseek 6
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#define SYS_lseek 6
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#define SYS_link 7
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#define SYS_link 7
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#define SYS_unlink 8
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#define SYS_unlink 8
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#define SYS_chdir 9
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#define SYS_chdir 9
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#define SYS_chmod 10
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#define SYS_chmod 10
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#define SYS_stat 11
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#define SYS_stat 11
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#define SYS_fstat 12
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#define SYS_fstat 12
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#define SYS_access 13
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#define SYS_access 13
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#define SYS_getpid 14
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#define SYS_getpid 14
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#define SYS_kill 15
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#define SYS_kill 15
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#define SYS_time 16
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#define SYS_time 16
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#define SYS_MAX 17
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#define SYS_MAX 17
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