crt0.S 1.5 KB

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  1. /*
  2. * libc/sysdeps/linux/v850/crt0.S -- Initial program entry point for linux/v850
  3. *
  4. * Copyright (C) 2001,02,03 NEC Electronics Corporation
  5. * Copyright (C) 2001,02,03 Miles Bader <miles@gnu.org>
  6. *
  7. * This file is subject to the terms and conditions of the GNU Lesser
  8. * General Public License. See the file COPYING.LIB in the main
  9. * directory of this archive for more details.
  10. *
  11. * Written by Miles Bader <miles@gnu.org>
  12. */
  13. #include <clinkage.h>
  14. /* Upon entry, the stack contains the following data:
  15. argc, argv[0], ..., argv[argc-1], 0, envp[0], ..., 0
  16. */
  17. .text
  18. C_ENTRY(start):
  19. ld.w 0[sp], r6 // Arg 0: argc
  20. addi 4, sp, r7 // Arg 1: argv
  21. mov r7, r8 // Arg 2: envp
  22. mov r6, r10 // skip argc elements to get envp start
  23. add 1, r10 // ...plus the NULL at the end of argv
  24. shl 2, r10 // Convert to byte-count to skip
  25. add r10, r8
  26. // Load CTBP register
  27. mov hilo(C_SYMBOL_NAME(_ctbp)), r19
  28. ldsr r19, ctbp
  29. // Load GP
  30. mov hilo(C_SYMBOL_NAME(_gp)), gp
  31. // tail-call uclibc's startup routine
  32. addi -24, sp, sp // Stack space reserved for args
  33. jr C_SYMBOL_NAME(__uClibc_main)
  34. /* Stick in a dummy reference to `main', so that if an application
  35. is linking when the `main' function is in a static library (.a)
  36. we can be sure that `main' actually gets linked in. */
  37. L_dummy_main_reference:
  38. .long C_SYMBOL_NAME(main)
  39. /* Define a symbol for the first piece of initialized data. */
  40. .data
  41. .globl __data_start
  42. __data_start:
  43. .long 0
  44. .weak data_start
  45. data_start = __data_start