setjmp.h 2.9 KB

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  1. /* Define the machine-dependent type `jmp_buf'. Alpha version.
  2. Copyright (C) 1992,1997,2003,2005,2006 Free Software Foundation, Inc.
  3. This file is part of the GNU C Library.
  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. The GNU C Library is distributed in the hope that it will be useful,
  9. but WITHOUT ANY WARRANTY; without even the implied warranty of
  10. MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  11. Lesser General Public License for more details.
  12. You should have received a copy of the GNU Lesser General Public
  13. License along with the GNU C Library; if not, write to the Free
  14. Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  15. 02111-1307 USA. */
  16. #ifndef _BITS_SETJMP_H
  17. #define _BITS_SETJMP_H 1
  18. #if !defined _SETJMP_H && !defined _PTHREAD_H
  19. # error "Never include <bits/setjmp.h> directly; use <setjmp.h> instead."
  20. #endif
  21. /* The previous bits/setjmp.h had __jmp_buf defined as a structure.
  22. We use an array of 'long int' instead, to make writing the
  23. assembler easier. Naturally, user code should not depend on
  24. either representation. */
  25. /*
  26. * Integer registers:
  27. * $0 is the return value (va);
  28. * $1-$8, $22-$25, $28 are call-used (t0-t7, t8-t11, at);
  29. * $9-$14 we save here (s0-s5);
  30. * $15 is the FP and we save it here (fp or s6);
  31. * $16-$21 are input arguments (call-used) (a0-a5);
  32. * $26 is the return PC and we save it here (ra);
  33. * $27 is the procedure value (i.e., the address of __setjmp) (pv or t12);
  34. * $29 is the global pointer, which the caller will reconstruct
  35. * from the return address restored in $26 (gp);
  36. * $30 is the stack pointer and we save it here (sp);
  37. * $31 is always zero (zero).
  38. *
  39. * Floating-point registers:
  40. * $f0 is the floating return value;
  41. * $f1, $f10-$f15, $f22-$f30 are call-used;
  42. * $f2-$f9 we save here;
  43. * $f16-$21 are input args (call-used);
  44. * $f31 is always zero.
  45. *
  46. * Note that even on Alpha hardware that does not have an FPU (there
  47. * isn't such a thing currently) it is required to implement the FP
  48. * registers.
  49. */
  50. #if defined __USE_MISC || defined __ASSEMBLY__
  51. # define JB_S0 0
  52. # define JB_S1 1
  53. # define JB_S2 2
  54. # define JB_S3 3
  55. # define JB_S4 4
  56. # define JB_S5 5
  57. # define JB_PC 6
  58. # define JB_FP 7
  59. # define JB_SP 8
  60. # define JB_F2 9
  61. # define JB_F3 10
  62. # define JB_F4 11
  63. # define JB_F5 12
  64. # define JB_F6 13
  65. # define JB_F7 14
  66. # define JB_F8 15
  67. # define JB_F9 16
  68. #endif
  69. #ifndef __ASSEMBLY__
  70. typedef long int __jmp_buf[17];
  71. /* Test if longjmp to JMPBUF would unwind the frame containing a local
  72. variable at ADDRESS. */
  73. #define _JMPBUF_UNWINDS(_jmpbuf, _address) \
  74. ((void *)(_address) < (void *)((_jmpbuf)[JB_SP]))
  75. #endif
  76. #endif /* bits/setjmp.h */