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klibc/arch/parisc/syscall.c

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/*

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 * arch/parisc/syscall.c

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 *

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 * This function is called from a stub with %r20 already set up.

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 * Compile this function with -ffixed-r20 so that it doesn't clobber

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 * this register by mistake.

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 */

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#include <klibc/compiler.h>

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#include <errno.h>

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long __syscall_common(long a0, long a1, long a2, long a3, long a4, long a5)

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{

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  register unsigned long rv asm ("r28");

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  asm volatile("\tble 0x100(%%sr2, %%r0)\n"

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               : "=r" (rv)

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               : "r" (a0), "r" (a1), "r" (a2), "r" (a3), "r" (a4), "r" (a5)

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               : "%r1", "%r2", "%r29", "%r31");

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  if ( __unlikely(rv >= -4095UL) ) {

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    errno = -rv;

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    return -1L;

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  } else {

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    return (long)rv;

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  }

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}

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