user.h 3.7 KB

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  1. #ifndef _SYS_USER_H
  2. #define _SYS_USER_H 1
  3. /*
  4. This file was taken from the nios2 port of the Linux Kernel.
  5. Copyright (c) 2008 Atle Nissestad <atle@nissestad.no>
  6. Copyright (c) 2010 Tobias Klauser <tklauser@distanz.ch>
  7. This file is licensed under the terms of the GNU General Public License,
  8. Version 2.
  9. */
  10. #include <bits/uClibc_page.h>
  11. /* Core file format: The core file is written in such a way that gdb
  12. can understand it and provide useful information to the user (under
  13. linux we use the 'trad-core' bfd). There are quite a number of
  14. obstacles to being able to view the contents of the floating point
  15. registers, and until these are solved you will not be able to view the
  16. contents of them. Actually, you can read in the core file and look at
  17. the contents of the user struct to find out what the floating point
  18. registers contain.
  19. The actual file contents are as follows:
  20. UPAGE: 1 page consisting of a user struct that tells gdb what is present
  21. in the file. Directly after this is a copy of the task_struct, which
  22. is currently not used by gdb, but it may come in useful at some point.
  23. All of the registers are stored as part of the upage. The upage should
  24. always be only one page.
  25. DATA: The data area is stored. We use current->end_text to
  26. current->brk to pick up all of the user variables, plus any memory
  27. that may have been malloced. No attempt is made to determine if a page
  28. is demand-zero or if a page is totally unused, we just cover the entire
  29. range. All of the addresses are rounded in such a way that an integral
  30. number of pages is written.
  31. STACK: We need the stack information in order to get a meaningful
  32. backtrace. We need to write the data from (esp) to
  33. current->start_stack, so we round each of these off in order to be able
  34. to write an integer number of pages.
  35. The minimum core file size is 3 pages, or 12288 bytes.
  36. */
  37. struct user_nios2fp_struct {
  38. };
  39. /* This is the old layout of "struct pt_regs" as of Linux 1.x, and
  40. is still the layout used by user (the new pt_regs doesn't have
  41. all registers). */
  42. struct user_regs_struct {
  43. long r1,r2,r3,r4,r5,r6,r7,r8;
  44. long r9,r10,r11,r12,r13,r14,r15;
  45. long r16,r17,r18,r19,r20,r21,r22,r23;
  46. long gp;
  47. long sp;
  48. long ra;
  49. long fp;
  50. long orig_r2;
  51. long estatus;
  52. long status_extension;
  53. long ea;
  54. };
  55. /* When the kernel dumps core, it starts by dumping the user struct -
  56. this will be used by gdb to figure out where the data and stack segments
  57. are within the file, and what virtual addresses to use. */
  58. struct user {
  59. /* We start with the registers, to mimic the way that "memory" is returned
  60. from the ptrace(3,...) function. */
  61. struct user_regs_struct regs; /* Where the registers are actually stored */
  62. /* The rest of this junk is to help gdb figure out what goes where */
  63. unsigned long int u_tsize; /* Text segment size (pages). */
  64. unsigned long int u_dsize; /* Data segment size (pages). */
  65. unsigned long int u_ssize; /* Stack segment size (pages). */
  66. unsigned long start_code; /* Starting virtual address of text. */
  67. unsigned long start_stack; /* Starting virtual address of stack area.
  68. This is actually the bottom of the stack,
  69. the top of the stack is always found in the
  70. esp register. */
  71. long int signal; /* Signal that caused the core dump. */
  72. int reserved; /* No longer used */
  73. unsigned long u_ar0; /* Used by gdb to help find the values for */
  74. /* the registers. */
  75. unsigned long magic; /* To uniquely identify a core file */
  76. char u_comm[32]; /* User command that was responsible */
  77. };
  78. #define NBPG PAGE_SIZE
  79. #define UPAGES 1
  80. #define HOST_TEXT_START_ADDR (u.start_code)
  81. #define HOST_STACK_END_ADDR (u.start_stack + u.u_ssize * NBPG)
  82. #endif