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sysdeps
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linux
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arm
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setcontext.S

setcontext.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 setcontext (const ucontext_t *ucp) */
    26. 

  26. 

  27. ENTRY(__setcontext)
    28. 

  28. 	mov	r4, r0
    29. 

  29. 

  30. #if defined __UCLIBC_HAS_FLOATS__ && ! defined __UCLIBC_HAS_SOFT_FLOAT__
    31. 

  31. # ifdef __VFP_FP__
    32. 

  32. 	/* Following instruction is vldmia r0!, {d8-d15}.  */
    33. 

  33. 	ldc     p11, cr8, [r0], #64
    34. 

  34. 	/* Restore the floating-point status register.  */
    35. 

  35. 	ldr     r1, [r0], #4
    36. 

  36. 	/* Following instruction is fmxr fpscr, r1.  */
    37. 

  37. 	mcr     p10, 7, r1, cr1, cr0, 0
    38. 

  38. # endif
    39. 

  39. #endif
    40. 

  40. 

  41. #ifdef __IWMMXT__
    42. 

  42. 	/* Restore the call-preserved iWMMXt registers.  */
    43. 

  43. 	/* Following instructions are wldrd wr10, [r0], #8 (etc.)  */
    44. 

  44. 	ldcl    p1, cr10, [r0], #8
    45. 

  45. 	ldcl    p1, cr11, [r0], #8
    46. 

  46. 	ldcl    p1, cr12, [r0], #8
    47. 

  47. 	ldcl    p1, cr13, [r0], #8
    48. 

  48. 	ldcl    p1, cr14, [r0], #8
    49. 

  49. 	ldcl    p1, cr15, [r0], #8
    50. 

  50. #endif
    51. 

  51. 

  52. 	/* Now bring back the signal status.  */
    53. 

  53. 	mov	r0, #SIG_SETMASK
    54. 

  54. 	add	r1, r4, #UCONTEXT_SIGMASK
    55. 

  55. 	mov	r2, #0
    56. 

  56. 	bl	PLTJMP(sigprocmask)
    57. 

  57. 

  58.         /* Loading r0-r3 makes makecontext easier.  */
    59. 

  59.         add     r14, r4, #MCONTEXT_ARM_R0
    60. 

  60.         ldmia   r14, {r0-r11}
    61. 

  61.         ldr     r13, [r14, #(MCONTEXT_ARM_SP - MCONTEXT_ARM_R0)]
    62. 

  62.         add     r14, r14, #(MCONTEXT_ARM_LR - MCONTEXT_ARM_R0)
    63. 

  63.         ldmia   r14, {r14, pc}
    64. 

  64. 

  65. END(setcontext)
    66. 

  66. weak_alias(__setcontext, setcontext)
    67. 

  67. 

  68. 	/* Called when a makecontext() context returns.  Start the
    69. 

  69. 	   context in R4 or fall through to exit().  */
    70. 

  70. ENTRY(__startcontext)
    71. 

  71.         movs    r0, r4
    72. 

  72.         bne     PLTJMP(__setcontext)
    73. 

  73. 

  74.         @ New context was 0 - exit
    75. 

  75.         b       PLTJMP(_exit)
    76. 

  76. END(__startcontext)
    77.