syscall.S 1.9 KB

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  1. /* Copyright (C) 1996, 1997 Free Software Foundation, Inc.
  2. This file is part of the GNU C Library.
  3. The GNU C Library is free software; you can redistribute it and/or
  4. modify it under the terms of the GNU Lesser General Public
  5. License as published by the Free Software Foundation; either
  6. version 2.1 of the License, or (at your option) any later version.
  7. The GNU C Library is distributed in the hope that it will be useful,
  8. but WITHOUT ANY WARRANTY; without even the implied warranty of
  9. MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  10. Lesser General Public License for more details.
  11. You should have received a copy of the GNU Lesser General Public
  12. License along with the GNU C Library; if not, see
  13. <http://www.gnu.org/licenses/>. */
  14. #include <features.h>
  15. #include <sys/asm.h>
  16. #include <sys/regdef.h>
  17. #ifdef __PIC__
  18. .option pic2
  19. #endif
  20. .text
  21. .align 2
  22. .globl syscall
  23. .type syscall,@function
  24. .ent syscall
  25. syscall:
  26. #ifdef __PIC__
  27. SETUP_GP
  28. #endif
  29. move v0, a0 /* Load system call number from first arg. */
  30. move a0, a1 /* Move the next three args up a register. */
  31. move a1, a2
  32. move a2, a3
  33. /* Load the remaining possible args (up to 7) from the stack. */
  34. #ifdef __mips64
  35. move a3, a4
  36. move a4, a5
  37. move a5, a6
  38. move a6, a7
  39. daddiu sp,sp,-16
  40. sd v0,0*8(sp)
  41. ld v0,0*8(sp) /* for system call restarts */
  42. #else
  43. lw a3,4*4(sp)
  44. lw t0,5*4(sp)
  45. lw t1,6*4(sp)
  46. lw t2,7*4(sp)
  47. addiu sp,sp,-32
  48. sw t0,4*4(sp)
  49. sw t1,5*4(sp)
  50. sw t2,6*4(sp)
  51. sw v0,7*4(sp)
  52. lw v0,7*4(sp) /* for system call restarts */
  53. #endif
  54. syscall /* Do the system call. */
  55. #ifdef __mips64
  56. daddiu sp,sp,16
  57. #else
  58. addiu sp,sp,32
  59. #endif
  60. bnez a3, 1f
  61. j ra /* Return to caller. */
  62. 1:
  63. move a0,v0 /* Pass return val to C function. */
  64. #ifdef __PIC__
  65. SETUP_GP64(v0, syscall)
  66. PTR_LA t9, __syscall_error
  67. RESTORE_GP64
  68. jr t9
  69. #else
  70. j __syscall_error
  71. #endif
  72. .end syscall
  73. .size syscall,.-syscall