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uclibc-ng
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libc
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sysdeps
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linux
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nds32
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setcontext.S

setcontext.S 2.0 KB
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  1. /*
    2. 

  2.  * Copyright (C) 2016-2017 Andes Technology, Inc.
    3. 

  3.  * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
    4. 

  4.  */
    5. 

  5. 

  6. #include <sysdep.h>
    7. 

  7. 

  8. #include "ucontext_i.h"
    9. 

  9. 

  10. ENTRY(__setcontext)
    11. 

  11.         move    $r4, $r0
    12. 

  12. 

  13. #ifdef __NDS32_ABI_2FP_PLUS__
    14. 

  14. 	addi	$r0,  $r4, UCONTEXT_FDREGS
    15. 

  15. 

  16. 	/* Case switch for $r20 as $fpcfg.freg.  */
    17. 

  17. 	beqz    $r20, .LCFG0         /* Branch if $fpcfg.freg = 0b00.  */
    18. 

  18. 	xori    $r15, $r20, #0b10
    19. 

  19. 	beqz    $r15, .LCFG2         /* Branch if $fpcfg.freg = 0b10.  */
    20. 

  20. 	srli    $r20, $r20, #0b01
    21. 

  21. 	beqz    $r20, .LCFG1         /* Branch if $fpcfg.freg = 0b01.  */
    22. 

  22. 	/* Fall-through if $fpcfg.freg = 0b11.  */
    23. 

  23. .LCFG3:
    24. 

  24. 	fldi $fd31, [$r0 + 248]
    25. 

  25. 	fldi $fd30, [$r0 + 240]
    26. 

  26. 	fldi $fd29, [$r0 + 232]
    27. 

  27. 	fldi $fd28, [$r0 + 224]
    28. 

  28. 	fldi $fd27, [$r0 + 216]
    29. 

  29. 	fldi $fd26, [$r0 + 208]
    30. 

  30. 	fldi $fd25, [$r0 + 200]
    31. 

  31. 	fldi $fd24, [$r0 + 192]
    32. 

  32. .LCFG2:
    33. 

  33. 	fldi $fd10, [$r0 + 80]
    34. 

  34. 	fldi $fd9, [$r0 + 72]
    35. 

  35. 	fldi $fd8, [$r0 + 64]
    36. 

  36. .LCFG1:
    37. 

  37. 	fldi $fd7, [$r0 + 56]
    38. 

  38. 	fldi $fd6, [$r0 + 48]
    39. 

  39. 	fldi $fd5, [$r0 + 40]
    40. 

  40. 	fldi $fd4, [$r0 + 32]
    41. 

  41. .LCFG0:
    42. 

  42. 	fldi $fd3, [$r0 + 24]
    43. 

  43. 	/*save fpcsr*/
    44. 

  44. 	lwi $r1, [$r0 + 0x100]
    45. 

  45. 	fmtcsr $r1
    46. 

  46. #endif /* __NDS32_ABI_2FP_PLUS__ */
    47. 

  47. 

  48. 	/* sigprocmask (SIG_BLOCK, &sc->sc_mask, NULL).  */
    49. 

  49. 	move    $r0, SIG_SETMASK
    50. 

  50. 	addi	$r1, $r4, UCONTEXT_SIGMASK
    51. 

  51. 	move	$r2, 0
    52. 

  52. 	move	$r3, _NSIG8
    53. 

  53. 	syscall SYS_ify(rt_sigprocmask)
    54. 

  54.         bnez    $r0, 1f
    55. 

  55. 

  56.         move    $r0, $r4
    57. 

  57.         addi    $r15, $r4, UCONTEXT_GREGS + 4
    58. 

  58. 	lmw.bim	$r1, [$r15], $r14
    59. 

  59.         addi    $r15, $r15, 4
    60. 

  60. 	lmw.bim	$r16, [$r15], $r25, #0xf
    61. 

  61.         lwi     $r15, [$r0 + UCONTEXT_PC]
    62. 

  62.         push    $r1
    63. 

  63. 	cfi_adjust_cfa_offset (4)
    64. 

  64.         move    $r1, $r0
    65. 

  65.         lwi     $r0, [$r1 + UCONTEXT_GREGS]
    66. 

  66.         pop     $r1
    67. 

  67. 	cfi_adjust_cfa_offset (-4)
    68. 

  68.         jr      $r15
    69. 

  69. 1:
    70. 

  70. 	move $r0, -1
    71. 

  71. 	ret
    72. 

  72. END(__setcontext)
    73. 

  73. 

  74. weak_alias (__setcontext, setcontext)
    75. 

  75. libc_hidden_def(__setcontext)
    76. 

  76. 

  77. ENTRY (__startcontext)
    78. 

  78.         move $r0, $r6
    79. 

  79. 	beqz $r0, 1f
    80. 

  80. 	jal HIDDEN_JUMPTARGET(__setcontext)
    81. 

  81. 1:	
    82. 

  82. 	move $r0, 0
    83. 

  83. 	j HIDDEN_JUMPTARGET(exit)
    84. 

  84. END (__startcontext)
    85. 

  85.