mmap64.S 2.2 KB

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  1. /* Copyright (C) 1995,96,97,98,99,2000,2002 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, write to the Free
  13. Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  14. 02111-1307 USA. */
  15. #define _ERRNO_H 1
  16. #include <features.h>
  17. #include <bits/errno.h>
  18. #include <sys/syscall.h>
  19. #if defined __UCLIBC_HAS_LFS__ && defined __NR_mmap2
  20. #define LINKAGE 4
  21. #define PTR_SIZE 4
  22. #define SVRSP 16 /* saved register space */
  23. #define PARMS LINKAGE+SVRSP /* space for 4 saved regs */
  24. #define ADDR PARMS
  25. #define LEN ADDR+PTR_SIZE
  26. #define PROT LEN+4
  27. #define FLAGS PROT+4
  28. #define FD FLAGS+4
  29. #define OFFLO FD+4
  30. #define OFFHI OFFLO+4
  31. .text
  32. .global mmap64
  33. .type mmap64,%function
  34. mmap64:
  35. /* Save registers. */
  36. pushl %ebp
  37. pushl %ebx
  38. pushl %esi
  39. pushl %edi
  40. movl OFFLO(%esp), %edx
  41. movl OFFHI(%esp), %ecx
  42. testl $0xfff, %edx
  43. jne L_einval
  44. shrdl $12, %ecx, %edx /* mmap2 takes the offset in pages. */
  45. shrl $12, %ecx
  46. jne L_einval
  47. movl %edx, %ebp
  48. movl ADDR(%esp), %ebx
  49. movl LEN(%esp), %ecx
  50. movl PROT(%esp), %edx
  51. movl FLAGS(%esp), %esi
  52. movl FD(%esp), %edi
  53. movl $__NR_mmap2, %eax /* System call number in %eax. */
  54. /* Do the system call trap. */
  55. int $0x80
  56. /* Restore registers. */
  57. popl %edi
  58. popl %esi
  59. popl %ebx
  60. popl %ebp
  61. /* If 0 > %eax > -4096 there was an error. */
  62. cmpl $-4095,%eax
  63. ja __syscall_error
  64. /* Successful; return the syscall's value. */
  65. ret
  66. /* This means the offset value is too large. */
  67. L_einval:
  68. popl %edi
  69. popl %esi
  70. popl %ebx
  71. popl %ebp
  72. movl $-EINVAL, %eax
  73. jmp __syscall_error
  74. .size mmap64,.-mmap64
  75. #endif