[hppa-linux] syscall work

[Mike Shaver]

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I've committed a mildly updated version of unistd.h, which contains the
magic _syscall<n> macros.  I'm sure I'm doing silly things, so you
should all point and laugh as approriate.

I've attached the relevant chunks for your easy mocking.

Mike

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22863.99 20474.77
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#define syscall_prolog                                                        \
    register long __res __asm__("%r22");                                      \
    register long __err __asm__("%r28");

#define syscall_epilog(type)                                                  \
if (__err == 0)                                                               \
        return (type) __res;                                                  \
errno = __res;                                                                \
return -1;

#define _syscall0(type,name)                                                  \
type name(void)                                                               \
{                                                                             \
    syscall_prolog;                                                           \
    __asm__ volatile ("ldil L%%0xC0000004,%%r1\n\t"                           \
                      "ble  R%%0xC0000004(%%sr7,%%r1)\n\t"                    \
                      "ldo  %2,%%r22"                                         \
                      : "=r" (__res), "=r" (__err)                            \
                      : "i" (__NR_##name));                                   \
    syscall_epilog(type);                                                     \
}

#define _syscall1(type,name,atype,a)                                          \
type name(atype a)                                                            \
{                                                                             \
    syscall_prolog;                                                           \
    __asm__ volatile ("ldo  %2,%%arg0\n\t"                                    \
                      "ldil L%%0xC0000004,%%r1\n\t"                           \
                      "ble  R%%0xC0000004(%%sr7,%%r1)\n\t"                    \
                      "ldo  %3,%%r22"                                         \
                      : "=r" (__res), "=r" (__err)                            \
                      : "i" (__NR_##name), "r" ((long)a));                    \
    syscall_epilog(type);                                                     \
}

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