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. .align 1<<4
  35. mmap64:
  36. /* Save registers. */
  37. pushl %ebp
  38. pushl %ebx
  39. pushl %esi
  40. pushl %edi
  41. movl OFFLO(%esp), %edx
  42. movl OFFHI(%esp), %ecx
  43. testl $0xfff, %edx
  44. jne L_einval
  45. shrdl $12, %ecx, %edx /* mmap2 takes the offset in pages. */
  46. shrl $12, %ecx
  47. jne L_einval
  48. movl %edx, %ebp
  49. movl ADDR(%esp), %ebx
  50. movl LEN(%esp), %ecx
  51. movl PROT(%esp), %edx
  52. movl FLAGS(%esp), %esi
  53. movl FD(%esp), %edi
  54. movl $__NR_mmap2, %eax /* System call number in %eax. */
  55. /* Do the system call trap. */
  56. int $0x80
  57. /* Restore registers. */
  58. popl %edi
  59. popl %esi
  60. popl %ebx
  61. popl %ebp
  62. /* If 0 > %eax > -4096 there was an error. */
  63. cmpl $-4095,%eax
  64. ja __syscall_error
  65. /* Successful; return the syscall's value. */
  66. ret
  67. /* This means the offset value is too large. */
  68. L_einval:
  69. popl %edi
  70. popl %esi
  71. popl %ebx
  72. popl %ebp
  73. movl $-EINVAL, %eax
  74. jmp __syscall_error
  75. .size mmap64,.-mmap64
  76. #endif