__longjmp.c 5.4 KB

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  1. /* Copyright (C) 1992, 1995, 1997, 2000 Free Software Foundation, Inc.
  2. This file is part of the GNU C Library.
  3. Contributed by Brendan Kehoe (brendan@zen.org).
  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, see
  14. <http://www.gnu.org/licenses/>. */
  15. #include <features.h>
  16. #include <setjmp.h>
  17. #include <stdlib.h>
  18. #include <sgidefs.h>
  19. #ifndef __GNUC__
  20. #error This file uses GNU C extensions; you must compile with GCC.
  21. #endif
  22. extern void __longjmp (__jmp_buf __env, int __val) attribute_noreturn;
  23. libc_hidden_proto(__longjmp)
  24. void __longjmp (__jmp_buf env, int val_arg)
  25. {
  26. /* gcc 1.39.19 miscompiled the longjmp routine (as it did setjmp before
  27. the hack around it); force it to use $a1 for the longjmp value.
  28. Without this it saves $a1 in a register which gets clobbered
  29. along the way. */
  30. register int val __asm__ ("a1");
  31. /* Pull back the floating point callee-saved registers. */
  32. #if defined __UCLIBC_HAS_FLOATS__ && ! defined __UCLIBC_HAS_SOFT_FLOAT__
  33. #if _MIPS_SIM == _MIPS_SIM_ABI64
  34. __asm__ __volatile__ ("l.d $f24, %0" : : "m" (env[0].__fpregs[0]));
  35. __asm__ __volatile__ ("l.d $f25, %0" : : "m" (env[0].__fpregs[1]));
  36. __asm__ __volatile__ ("l.d $f26, %0" : : "m" (env[0].__fpregs[2]));
  37. __asm__ __volatile__ ("l.d $f27, %0" : : "m" (env[0].__fpregs[3]));
  38. __asm__ __volatile__ ("l.d $f28, %0" : : "m" (env[0].__fpregs[4]));
  39. __asm__ __volatile__ ("l.d $f29, %0" : : "m" (env[0].__fpregs[5]));
  40. __asm__ __volatile__ ("l.d $f30, %0" : : "m" (env[0].__fpregs[6]));
  41. __asm__ __volatile__ ("l.d $f31, %0" : : "m" (env[0].__fpregs[7]));
  42. #else /* O32 || N32 */
  43. __asm__ __volatile__ ("l.d $f20, %0" : : "m" (env[0].__fpregs[0]));
  44. __asm__ __volatile__ ("l.d $f22, %0" : : "m" (env[0].__fpregs[1]));
  45. __asm__ __volatile__ ("l.d $f24, %0" : : "m" (env[0].__fpregs[2]));
  46. __asm__ __volatile__ ("l.d $f26, %0" : : "m" (env[0].__fpregs[3]));
  47. __asm__ __volatile__ ("l.d $f28, %0" : : "m" (env[0].__fpregs[4]));
  48. __asm__ __volatile__ ("l.d $f30, %0" : : "m" (env[0].__fpregs[5]));
  49. #endif /* O32 || N32 */
  50. /* Get and reconstruct the floating point csr. */
  51. __asm__ __volatile__ ("lw $2, %0" : : "m" (env[0].__fpc_csr));
  52. __asm__ __volatile__ ("ctc1 $2, $31");
  53. #endif
  54. /* Get the GP. */
  55. #if _MIPS_SIM == _MIPS_SIM_ABI64
  56. __asm__ __volatile__ ("ld $gp, %0" : : "m" (env[0].__gp));
  57. #else /* O32 || N32 */
  58. __asm__ __volatile__ ("lw $gp, %0" : : "m" (env[0].__gp));
  59. #endif /* O32 || N32 */
  60. /* Get the callee-saved registers. */
  61. #if _MIPS_SIM == _MIPS_SIM_ABI32
  62. __asm__ __volatile__ ("lw $16, %0" : : "m" (env[0].__regs[0]));
  63. __asm__ __volatile__ ("lw $17, %0" : : "m" (env[0].__regs[1]));
  64. __asm__ __volatile__ ("lw $18, %0" : : "m" (env[0].__regs[2]));
  65. __asm__ __volatile__ ("lw $19, %0" : : "m" (env[0].__regs[3]));
  66. __asm__ __volatile__ ("lw $20, %0" : : "m" (env[0].__regs[4]));
  67. __asm__ __volatile__ ("lw $21, %0" : : "m" (env[0].__regs[5]));
  68. __asm__ __volatile__ ("lw $22, %0" : : "m" (env[0].__regs[6]));
  69. __asm__ __volatile__ ("lw $23, %0" : : "m" (env[0].__regs[7]));
  70. #else /* N32 || N64 */
  71. __asm__ __volatile__ ("ld $16, %0" : : "m" (env[0].__regs[0]));
  72. __asm__ __volatile__ ("ld $17, %0" : : "m" (env[0].__regs[1]));
  73. __asm__ __volatile__ ("ld $18, %0" : : "m" (env[0].__regs[2]));
  74. __asm__ __volatile__ ("ld $19, %0" : : "m" (env[0].__regs[3]));
  75. __asm__ __volatile__ ("ld $20, %0" : : "m" (env[0].__regs[4]));
  76. __asm__ __volatile__ ("ld $21, %0" : : "m" (env[0].__regs[5]));
  77. __asm__ __volatile__ ("ld $22, %0" : : "m" (env[0].__regs[6]));
  78. __asm__ __volatile__ ("ld $23, %0" : : "m" (env[0].__regs[7]));
  79. #endif /* N32 || N64 */
  80. /* Get the PC. */
  81. #if _MIPS_SIM == _MIPS_SIM_ABI32
  82. __asm__ __volatile__ ("lw $25, %0" : : "m" (env[0].__pc));
  83. #elif _MIPS_SIM == _MIPS_SIM_NABI32
  84. __asm__ __volatile__ ("lw $31, %0" : : "m" (env[0].__pc));
  85. #else /* N64 */
  86. __asm__ __volatile__ ("ld $31, %0" : : "m" (env[0].__pc));
  87. #endif /* N64 */
  88. /* Restore the stack pointer and the FP. They have to be restored
  89. last and in a single asm as gcc, depending on options used, may
  90. use either of them to access env. */
  91. #if _MIPS_SIM != _MIPS_SIM_ABI32
  92. __asm__ __volatile__ ("ld $29, %0\n\t"
  93. "ld $30, %1\n\t" : : "m" (env[0].__sp), "m" (env[0].__fp));
  94. #else /* O32 */
  95. __asm__ __volatile__ ("lw $29, %0\n\t"
  96. "lw $30, %1\n\t" : : "m" (env[0].__sp), "m" (env[0].__fp));
  97. #endif /* O32 */
  98. /* Give setjmp 1 if given a 0, or what they gave us if non-zero. */
  99. if (val == 0)
  100. __asm__ __volatile__ ("li $2, 1");
  101. else
  102. __asm__ __volatile__ ("move $2, %0" : : "r" (val));
  103. #if _MIPS_SIM == _MIPS_SIM_ABI32
  104. __asm__ __volatile__ ("jr $25");
  105. #else /* N32 || N64 */
  106. __asm__ __volatile__ ("jr $31");
  107. #endif /* N32 || N64 */
  108. /* Avoid `volatile function does return' warnings. */
  109. for (;;);
  110. }
  111. libc_hidden_def(__longjmp)