__longjmp.c 3.1 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, write to the Free
  14. Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  15. 02111-1307 USA. */
  16. #include <setjmp.h>
  17. #include <stdlib.h>
  18. #undef __longjmp
  19. #ifndef __GNUC__
  20. #error This file uses GNU C extensions; you must compile with GCC.
  21. #endif
  22. void
  23. __longjmp (env, val_arg)
  24. __jmp_buf env;
  25. int val_arg;
  26. {
  27. /* gcc 1.39.19 miscompiled the longjmp routine (as it did setjmp before
  28. the hack around it); force it to use $a1 for the longjmp value.
  29. Without this it saves $a1 in a register which gets clobbered
  30. along the way. */
  31. register int val asm ("a1");
  32. /* Pull back the floating point callee-saved registers. */
  33. asm volatile ("l.d $f20, %0" : : "m" (env[0].__fpregs[0]));
  34. asm volatile ("l.d $f22, %0" : : "m" (env[0].__fpregs[1]));
  35. asm volatile ("l.d $f24, %0" : : "m" (env[0].__fpregs[2]));
  36. asm volatile ("l.d $f26, %0" : : "m" (env[0].__fpregs[3]));
  37. asm volatile ("l.d $f28, %0" : : "m" (env[0].__fpregs[4]));
  38. asm volatile ("l.d $f30, %0" : : "m" (env[0].__fpregs[5]));
  39. /* Get and reconstruct the floating point csr. */
  40. asm volatile ("lw $2, %0" : : "m" (env[0].__fpc_csr));
  41. asm volatile ("ctc1 $2, $31");
  42. /* Get the GP. */
  43. asm volatile ("lw $gp, %0" : : "m" (env[0].__gp));
  44. /* Get the callee-saved registers. */
  45. asm volatile ("lw $16, %0" : : "m" (env[0].__regs[0]));
  46. asm volatile ("lw $17, %0" : : "m" (env[0].__regs[1]));
  47. asm volatile ("lw $18, %0" : : "m" (env[0].__regs[2]));
  48. asm volatile ("lw $19, %0" : : "m" (env[0].__regs[3]));
  49. asm volatile ("lw $20, %0" : : "m" (env[0].__regs[4]));
  50. asm volatile ("lw $21, %0" : : "m" (env[0].__regs[5]));
  51. asm volatile ("lw $22, %0" : : "m" (env[0].__regs[6]));
  52. asm volatile ("lw $23, %0" : : "m" (env[0].__regs[7]));
  53. /* Get the PC. */
  54. asm volatile ("lw $25, %0" : : "m" (env[0].__pc));
  55. /* Restore the stack pointer and the FP. They have to be restored
  56. last and in a single asm as gcc, depending on options used, may
  57. use either of them to access env. */
  58. asm volatile ("lw $29, %0\n\t"
  59. "lw $30, %1\n\t" : : "m" (env[0].__sp), "m" (env[0].__fp));
  60. /* Give setjmp 1 if given a 0, or what they gave us if non-zero. */
  61. if (val == 0)
  62. asm volatile ("li $2, 1");
  63. else
  64. asm volatile ("move $2, %0" : : "r" (val));
  65. asm volatile ("jr $25");
  66. /* Avoid `volatile function does return' warnings. */
  67. for (;;);
  68. }