sysdeps/powerpc/novmxsetjmp.h

   1 /* Copyright (C) 1991-1999, 2001, 2002, 2004 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, see
  16    <http://www.gnu.org/licenses/>.  */
  17
  18 /* Copied from setjmp/setjmp.h, powerpc/bits/setjmp.h and modified
  19    appropriately to keep backward compatible with setjmp without
  20    AltiVec/VMX support.
  21
  22    This file is not exported and the interfaces are private to libc.  */
  23
  24 #ifndef __NOVMX_SETJMP_H
  25 #define __NOVMX_SETJMP_H        1
  26
  27 #include <bits/wordsize.h>
  28
  29 /* The following definitions are needed by ASM implementations of the old
  30    (novmx) __longjmp/__setjmp functions.  */
  31
  32 # define JB_GPR1   0  /* Also known as the stack pointer */
  33 # define JB_GPR2   1
  34 # define JB_LR     2  /* The address we will return to */
  35 # if __WORDSIZE == 64
  36 #  define JB_GPRS   3  /* GPRs 14 through 31 are saved, 18*2 words total.  */
  37 #  define JB_CR     21 /* Condition code registers. */
  38 #  define JB_FPRS   22 /* FPRs 14 through 31 are saved, 18*2 words total.  */
  39 #  define JB_SIZE   (40 * 8)
  40 # else
  41 #  define JB_GPRS   3  /* GPRs 14 through 31 are saved, 18 in total.  */
  42 #  define JB_CR     21 /* Condition code registers.  */
  43 #  define JB_FPRS   22 /* FPRs 14 through 31 are saved, 18*2 words total.  */
  44 #  define JB_SIZE   (58 * 4)
  45 # endif
  46
  47 #ifndef _ASM
  48 /* The following definitions are needed by the novmx* implementations of
  49    setjmp/longjmp/sigsetjmp/etc that wrapper __setjmp/__longjmp.  */
  50
  51 # if __WORDSIZE == 64
  52 typedef long int __jmp_buf[40];
  53 # else
  54 typedef long int __jmp_buf[58];
  55 # endif
  56
  57 # include <bits/sigset.h>               /* Get `__sigset_t'.  */
  58
  59 /* Calling environment, plus possibly a saved signal mask.  */
  60 typedef struct __novmx__jmp_buf_tag
  61   {
  62     /* NOTE: The machine-dependent definitions of `__sigsetjmp'
  63        assume that a `jmp_buf' begins with a `__jmp_buf' and that
  64        `__mask_was_saved' follows it.  Do not move these members
  65        or add others before it.  */
  66     __jmp_buf __jmpbuf;         /* Calling environment.  */
  67     int __mask_was_saved;       /* Saved the signal mask?  */
  68     __sigset_t __saved_mask;    /* Saved signal mask.  */
  69   } __novmx__jmp_buf[1];
  70
  71
  72 /* Store the calling environment in ENV, also saving the signal mask.
  73    Return 0.  */
  74 extern int __novmxsetjmp (__novmx__jmp_buf __env);
  75
  76 /* Store the calling environment in ENV, also saving the
  77    signal mask if SAVEMASK is nonzero.  Return 0.
  78    This is the internal name for `sigsetjmp'.  */
  79 extern int __novmx__sigsetjmp (struct __novmx__jmp_buf_tag __env[1],
  80                                int __savemask);
  81
  82 /* Store the calling environment in ENV, not saving the signal mask.
  83    Return 0.  */
  84 extern int __novmx_setjmp (struct __novmx__jmp_buf_tag __env[1]);
  85
  86 /* Jump to the environment saved in ENV, making the
  87    `setjmp' call there return VAL, or 1 if VAL is 0.  */
  88 extern void __novmxlongjmp (struct __novmx__jmp_buf_tag __env[1], int __val)
  89      __attribute__ ((__noreturn__));
  90
  91 /* Same.  Usually `_longjmp' is used with `_setjmp', which does not save
  92    the signal mask.  But it is how ENV was saved that determines whether
  93    `longjmp' restores the mask; `_longjmp' is just an alias.  */
  94 extern void __novmx_longjmp (struct __novmx__jmp_buf_tag __env[1], int __val)
  95      __attribute__ ((__noreturn__));
  96
  97 /* Use the same type for `jmp_buf' and `sigjmp_buf'.
  98    The `__mask_was_saved' flag determines whether
  99    or not `longjmp' will restore the signal mask.  */
 100 typedef struct __novmx__jmp_buf_tag __novmx__sigjmp_buf[1];
 101
 102 /* Jump to the environment saved in ENV, making the
 103    sigsetjmp call there return VAL, or 1 if VAL is 0.
 104    Restore the signal mask if that sigsetjmp call saved it.
 105    This is just an alias `longjmp'.  */
 106 extern void __novmxsiglongjmp (__novmx__sigjmp_buf __env, int __val)
 107      __attribute__ ((__noreturn__));
 108
 109 /* Internal machine-dependent function to restore context sans signal mask.  */
 110 extern void __novmx__longjmp (__jmp_buf __env, int __val)
 111      __attribute__ ((__noreturn__));
 112
 113 /* Internal function to possibly save the current mask of blocked signals
 114    in ENV, and always set the flag saying whether or not it was saved.
 115    This is used by the machine-dependent definition of `__sigsetjmp'.
 116    Always returns zero, for convenience.  */
 117 extern int __novmx__sigjmp_save (__novmx__jmp_buf __env, int __savemask);
 118
 119 extern void _longjmp_unwind (__novmx__jmp_buf env, int val);
 120
 121 extern void __novmx__libc_siglongjmp (__novmx__sigjmp_buf env, int val)
 122           __attribute__ ((noreturn));
 123
 124 extern void __novmx__libc_longjmp (__novmx__sigjmp_buf env, int val)
 125      __attribute__ ((noreturn));
 126
 127 libc_hidden_proto (__novmx__libc_longjmp)
 128 libc_hidden_proto (__novmx_setjmp)
 129 libc_hidden_proto (__novmx__sigsetjmp)
 130 #endif /* !_ASM */
 131
 132 #endif