sysdeps/mach/alpha/sysdep.h

   1 /* Copyright (C) 1994,97,2002 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, write to the Free
  16    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  17    02111-1307 USA.  */
  18
  19 #define MOVE(x,y)       mov x, y
  20
  21 #define LOSE asm volatile ("call_pal 0") /* halt */
  22
  23 #define START_MACHDEP \
  24   asm ("_start: mov     $30, $16\n" /* Put initial SP in a0.  */              \
  25        "        br      $27, 1f\n" /* Load GP from PC.  */                    \
  26        "1:      ldgp    $29, 0($27)\n"                                        \
  27        "        jmp     $26, _start0"); /* Jump to _start0; don't return.  */
  28 #define START_ARGS      char **sparg
  29 #define SNARF_ARGS(argc, argv, envp) \
  30   (envp = &(argv = &sparg[1])[(argc = *(int *) sparg) + 1])
  31
  32 #define CALL_WITH_SP(fn, sp) \
  33   ({ register long int __fn = (long int) fn, __sp = (long int) sp; \
  34      asm volatile ("mov %0,$30; jmp $31, (%1); ldgp $29, 0(%1)" \
  35                    : : "r" (__sp), "r" (__fn)); })
  36
  37 #define STACK_GROWTH_DOWN
  38
  39 #define RETURN_TO(sp, pc, retval) \
  40   asm volatile ("mov %0,$30; jmp $31, (%1); mov %2,$0" \
  41                 : : "r" (sp), "r" (pc), "r" ((long int) (retval)));
  42
  43 #define ALIGN 3
  44 #include <sysdeps/mach/sysdep.h>
  45
  46 /* Alpha needs the .ent and .frame magic that the generic version lacks.  */
  47 #undef ENTRY
  48 #define ENTRY(name)                             \
  49   .globl name;                                  \
  50   .align 3;                                     \
  51   .ent name, 0;                                 \
  52   name##:                                       \
  53   .frame sp, 0, ra
  54
  55 #include <mach/alpha/asm.h>
  56 #undef  at
  57 #define at      28
  58 #define AT      $28
  59 #define fp      s6