global_init.c 3.0 KB

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  1. /*
  2. * Copyright (C) 2011-2016 Intel Corporation. All rights reserved.
  3. *
  4. * Redistribution and use in source and binary forms, with or without
  5. * modification, are permitted provided that the following conditions
  6. * are met:
  7. *
  8. * * Redistributions of source code must retain the above copyright
  9. * notice, this list of conditions and the following disclaimer.
  10. * * Redistributions in binary form must reproduce the above copyright
  11. * notice, this list of conditions and the following disclaimer in
  12. * the documentation and/or other materials provided with the
  13. * distribution.
  14. * * Neither the name of Intel Corporation nor the names of its
  15. * contributors may be used to endorse or promote products derived
  16. * from this software without specific prior written permission.
  17. *
  18. * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  19. * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  20. * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  21. * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  22. * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  23. * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  24. * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  25. * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  26. * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  27. * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  28. * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  29. *
  30. */
  31. #include "internal/global_init.h"
  32. #include "linux/elf_parser.h"
  33. #include "global_data.h"
  34. #include "internal/util.h"
  35. #include "thread_data.h"
  36. #include "sgx_trts.h"
  37. #include <assert.h>
  38. #include <stdlib.h>
  39. typedef void (*fp_t)(void);
  40. /* required by global constructor when -fuse-cxa-atexit is enabled */
  41. void *__dso_handle __attribute__((weak)) = &(__dso_handle);
  42. int __cxa_atexit(void (*fun)(void *), void *para, void *dso)
  43. {
  44. (void)(fun);
  45. (void)(para);
  46. (void)(dso);
  47. return 0;
  48. }
  49. /* auxiliary routines */
  50. static void do_ctors_aux(void)
  51. {
  52. /* SGX RTS does not support .ctors currently */
  53. fp_t *p = NULL;
  54. uintptr_t init_array_addr;
  55. size_t init_array_size;
  56. const void *enclave_start = (const void*)&__ImageBase;
  57. elf_get_init_array(enclave_start, &init_array_addr, &init_array_size);
  58. if (init_array_addr == 0 || init_array_size == 0)
  59. return;
  60. fp_t *fp_start = (fp_t*)(init_array_addr + (uintptr_t)(enclave_start));
  61. fp_t *fp_end = fp_start + (init_array_size / sizeof(fp_t));
  62. /* traverse .init_array in forward order */
  63. for (p = fp_start; p < fp_end; p++)
  64. {
  65. (*p)();
  66. }
  67. }
  68. void init_global_object(void)
  69. {
  70. do_ctors_aux();
  71. }
  72. void init_stack_guard(void)
  73. {
  74. thread_data_t *thread_data = get_thread_data();
  75. assert(thread_data != NULL);
  76. if (SGX_SUCCESS != sgx_read_rand(
  77. (unsigned char*)&thread_data->stack_guard,
  78. sizeof(thread_data->stack_guard)))
  79. abort();
  80. }