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resolve.S

resolve.S 2.2 KB
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  1.      /* Copyright (C) 2003 Red Hat, Inc.
    2. 

  2. 	Contributed by Alexandre Oliva <aoliva@redhat.com>
    3. 

  3. 

  4. This file is part of uClibc.
    5. 

  5. 

  6. uClibc is free software; you can redistribute it and/or modify it
    7. 

  7. under the terms of the GNU Lesser General Public License as
    8. 

  8. published by the Free Software Foundation; either version 2.1 of the
    9. 

  9. License, or (at your option) any later version.
    10. 

  10. 

  11. uClibc is distributed in the hope that it will be useful, but WITHOUT
    12. 

  12. ANY WARRANTY; without even the implied warranty of
    13. 

  13. MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    14. 

  14. Library General Public License for more details.
    15. 

  15. 

  16. You should have received a copy of the GNU Lesser General Public
    17. 

  17. License along with uClibc; see the file COPYING.LIB.  If not, see
    18. 

  18. <http://www.gnu.org/licenses/>.  */
    19. 

  19. 

  20.      /* The function below is tail-called by resolver stubs when a
    21. 

  21. 	lazily-bound function is called.  It must preserve all
    22. 

  22. 	registers that could be used to pass arguments to the actual
    23. 

  23. 	function.  Upon _dl_linux_resolve entry, GR14 holds the
    24. 

  24. 	address of a lazy PLT entry, so @(GR14,-4) is the lazy
    25. 

  25. 	relocation number that we have to pass to _dl_linux_resolver.
    26. 

  26. 	GR15 holds the caller's GOT, from which we extract the
    27. 

  27. 	elf_resolve* that _dl_linux_resolver needs as well.
    28. 

  28. 

  29. 	_dl_linux_resolver() figures out where the jump symbol is
    30. 

  30. 	_really_ supposed to have jumped to and returns that to us.
    31. 

  31. 	Once we have that, we prepare to tail-call the actual
    32. 

  32. 	function, clean up after ourselves, restoring the original
    33. 

  33. 	arguments, then jump to the fixed up address.  */
    34. 

  34. 

  35. 	.text
    36. 

  36. 	.p2align 4
    37. 

  37. 

  38. 	.hidden	__dl_linux_resolve
    39. 

  39. 	.global	__dl_linux_resolve
    40. 

  40. 	.type	__dl_linux_resolve,@function
    41. 

  41. 

  42. __dl_linux_resolve:
    43. 

  43. 	/* Preserve arguments.  */
    44. 

  44. 	[--SP] = RETS;
    45. 

  45. 	[--SP] = P0;
    46. 

  46. 	[--SP] = R0;
    47. 

  47. 	[--SP] = R1;
    48. 

  48. 	[--SP] = R2;
    49. 

  49. 	sp += -12;
    50. 

  50. 

  51. 	/* Prepare to call _dl_linux_resolver.  */
    52. 

  52. 	R0 = [P3 + 8];
    53. 

  53. 	/* Not aligned for space reasons.  */
    54. 

  54. 	R1 = W[P1 + -4] (Z);
    55. 

  55. 	P1 += -2;
    56. 

  56. 	R1.H = W[P1];
    57. 

  57. 

  58. 	P3 = R3;
    59. 

  59. 	CALL	__dl_linux_resolver;
    60. 

  60. 

  61. 	/* Move aside return value that contains the FUNCDESC_VALUE.  */
    62. 

  62. 	P3 = R0;
    63. 

  63. 	P1 = [P3];
    64. 

  64. 	P3 = [P3 + 4];
    65. 

  65. 

  66. 	/* Restore arguments.  */
    67. 

  67. 	sp += 12;
    68. 

  68. 	R2 = [SP++];
    69. 

  69. 	R1 = [SP++];
    70. 

  70. 	R0 = [SP++];
    71. 

  71. 	P0 = [SP++];
    72. 

  72. 	RETS = [SP++];
    73. 

  73. 

  74. 	/* Now jump to the actual function.  */
    75. 

  75. 	JUMP	(P1);
    76. 

  76. 	.size	__dl_linux_resolve, . - __dl_linux_resolve
    77.