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sysdeps
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arm
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getcontext.S

getcontext.S 2.3 KB
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  1. /* Copyright (C) 2012 Free Software Foundation, Inc.
    2. 

  2.    This file is part of the GNU C Library.
    3. 

  3. 

  4.    The GNU C Library is free software; you can redistribute it and/or
    5. 

  5.    modify it under the terms of the GNU Lesser General Public
    6. 

  6.    License as published by the Free Software Foundation; either
    7. 

  7.    version 2.1 of the License, or (at your option) any later version.
    8. 

  8. 

  9.    The GNU C Library is distributed in the hope that it will be useful,
    10. 

  10.    but WITHOUT ANY WARRANTY; without even the implied warranty of
    11. 

  11.    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    12. 

  12.    Lesser General Public License for more details.
    13. 

  13. 

  14.    You should have received a copy of the GNU Lesser General Public
    15. 

  15.    License along with the GNU C Library; if not, see
    16. 

  16.    <http://www.gnu.org/licenses/>.  */
    17. 

  17. 

  18. #include <sysdep.h>
    19. 

  19. 

  20. #include "ucontext_i.h"
    21. 

  21. 

  22. 	.syntax unified
    23. 

  23. 	.text
    24. 

  24. 

  25. /* int getcontext (ucontext_t *ucp) */
    26. 

  26. 

  27. ENTRY(__getcontext)
    28. 

  28. 	/* No need to save r0-r3, d0-d7, or d16-d31.  */
    29. 

  29. 	add	r1, r0, #MCONTEXT_ARM_R4
    30. 

  30. 	stmia   r1, {r4-r11}
    31. 

  31. 

  32. 	/* Save R13 separately as Thumb can't STM it.  */
    33. 

  33. 	str     r13, [r0, #MCONTEXT_ARM_SP]
    34. 

  34. 	str     r14, [r0, #MCONTEXT_ARM_LR]
    35. 

  35. 	/* Return to LR */
    36. 

  36. 	str     r14, [r0, #MCONTEXT_ARM_PC]
    37. 

  37. 	/* Return zero */
    38. 

  38. 	mov     r2, #0
    39. 

  39. 	str     r2, [r0, #MCONTEXT_ARM_R0]
    40. 

  40. 

  41. 	/* Save ucontext_t * across the next call.  */
    42. 

  42. 	mov	r4, r0
    43. 

  43. 

  44. 	/* __sigprocmask(SIG_BLOCK, NULL, &(ucontext->uc_sigmask)) */
    45. 

  45. 	mov     r0, #SIG_BLOCK
    46. 

  46. 	mov     r1, #0
    47. 

  47. 	add     r2, r4, #UCONTEXT_SIGMASK
    48. 

  48. 	bl      PLTJMP(sigprocmask)
    49. 

  49. 

  50. #if defined __UCLIBC_HAS_FLOATS__ && ! defined __UCLIBC_HAS_SOFT_FLOAT__
    51. 

  51. # ifdef __VFP_FP__
    52. 

  52. 	/* Store the VFP registers.  */
    53. 

  53. 	/* Following instruction is fstmiax ip!, {d8-d15}.  */
    54. 

  54. 	stc     p11, cr8, [r0], #64
    55. 

  55. 	/* Store the floating-point status register.  */
    56. 

  56. 	/* Following instruction is fmrx r2, fpscr.  */
    57. 

  57. 	mrc     p10, 7, r1, cr1, cr0, 0
    58. 

  58. 	str     r1, [r0], #4
    59. 

  59. # endif
    60. 

  60. #endif
    61. 

  61. #ifdef __IWMMXT__
    62. 

  62. 	/* Save the call-preserved iWMMXt registers.  */
    63. 

  63. 	/* Following instructions are wstrd wr10, [r0], #8 (etc.)  */
    64. 

  64. 	stcl    p1, cr10, [r0], #8
    65. 

  65. 	stcl    p1, cr11, [r0], #8
    66. 

  66. 	stcl    p1, cr12, [r0], #8
    67. 

  67. 	stcl    p1, cr13, [r0], #8
    68. 

  68. 	stcl    p1, cr14, [r0], #8
    69. 

  69. 	stcl    p1, cr15, [r0], #8
    70. 

  70. #endif
    71. 

  71. 

  72. 	/* Restore the clobbered R4 and LR.  */
    73. 

  73. 	ldr	r14, [r4, #MCONTEXT_ARM_LR]
    74. 

  74. 	ldr	r4, [r4, #MCONTEXT_ARM_R4]
    75. 

  75. 

  76. 	mov	r0, #0
    77. 

  77. 	DO_RET(r14)
    78. 

  78. 

  79. END(__getcontext)
    80. 

  80. weak_alias(__getcontext, getcontext)
    81.