/Modules/_ctypes/libffi/src/powerpc/sysv.S

http://unladen-swallow.googlecode.com/ · Assembly · 230 lines · 174 code · 16 blank · 40 comment · 5 complexity · 889b214acb97d36fa25441c00a9a0ea1 MD5 · raw file 

    

  1. /* -----------------------------------------------------------------------
    2. 

  2.    sysv.S - Copyright (c) 1998 Geoffrey Keating
    3. 

  3.    Copyright (C) 2007 Free Software Foundation, Inc
    4. 

    5. 

  5.    PowerPC Assembly glue.
    6. 

    7. 

  7.    Permission is hereby granted, free of charge, to any person obtaining
    8. 

  8.    a copy of this software and associated documentation files (the
    9. 

  9.    ``Software''), to deal in the Software without restriction, including
    10. 

  10.    without limitation the rights to use, copy, modify, merge, publish,
    11. 

  11.    distribute, sublicense, and/or sell copies of the Software, and to
    12. 

  12.    permit persons to whom the Software is furnished to do so, subject to
    13. 

  13.    the following conditions:
    14. 

    15. 

  15.    The above copyright notice and this permission notice shall be included
    16. 

  16.    in all copies or substantial portions of the Software.
    17. 

    18. 

  18.    THE SOFTWARE IS PROVIDED ``AS IS'', WITHOUT WARRANTY OF ANY KIND,
    19. 

  19.    EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
    20. 

  20.    MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
    21. 

  21.    NONINFRINGEMENT.  IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
    22. 

  22.    HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
    23. 

  23.    WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
    24. 

  24.    OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
    25. 

  25.    DEALINGS IN THE SOFTWARE.
    26. 

  26.    ----------------------------------------------------------------------- */
    27. 

  27. 

  28. #define LIBFFI_ASM
    29. 

  29. #include <fficonfig.h>
    30. 

  30. #include <ffi.h>
    31. 

  31. #include <powerpc/asm.h>
    32. 

  32. 

  33. #ifndef __powerpc64__
    34. 

  34. 	.globl ffi_prep_args_SYSV
    35. 

  35. ENTRY(ffi_call_SYSV)
    36. 

  36. .LFB1:
    37. 

  37. 	/* Save the old stack pointer as AP.  */
    38. 

  38. 	mr	%r8,%r1
    39. 

  39. 

  40. .LCFI0:
    41. 

  41. 	/* Allocate the stack space we need.  */
    42. 

  42. 	stwux	%r1,%r1,%r4
    43. 

  43. 	/* Save registers we use.  */
    44. 

  44. 	mflr	%r9
    45. 

  45. 	stw	%r28,-16(%r8)
    46. 

  46. .LCFI1:
    47. 

  47. 	stw	%r29,-12(%r8)
    48. 

  48. .LCFI2:
    49. 

  49. 	stw	%r30, -8(%r8)
    50. 

  50. .LCFI3:
    51. 

  51. 	stw	%r31, -4(%r8)
    52. 

  52. .LCFI4:
    53. 

  53. 	stw	%r9,   4(%r8)
    54. 

  54. .LCFI5:
    55. 

  55. 

  56. 	/* Save arguments over call...  */
    57. 

  57. 	mr	%r31,%r5	/* flags, */
    58. 

  58. 	mr	%r30,%r6	/* rvalue, */
    59. 

  59. 	mr	%r29,%r7	/* function address, */
    60. 

  60. 	mr	%r28,%r8	/* our AP. */
    61. 

  61. .LCFI6:
    62. 

  62. 

  63. 	/* Call ffi_prep_args_SYSV.  */
    64. 

  64. 	mr	%r4,%r1
    65. 

  65. 	bl	ffi_prep_args_SYSV@local
    66. 

  66. 

  67. 	/* Now do the call.  */
    68. 

  68. 	/* Set up cr1 with bits 4-7 of the flags.  */
    69. 

  69. 	mtcrf	0x40,%r31
    70. 

  70. 	/* Get the address to call into CTR.  */
    71. 

  71. 	mtctr	%r29
    72. 

  72. 	/* Load all those argument registers.  */
    73. 

  73. 	lwz	%r3,-16-(8*4)(%r28)
    74. 

  74. 	lwz	%r4,-16-(7*4)(%r28)
    75. 

  75. 	lwz	%r5,-16-(6*4)(%r28)
    76. 

  76. 	lwz	%r6,-16-(5*4)(%r28)
    77. 

  77. 	bf-	5,1f
    78. 

  78. 	nop
    79. 

  79. 	lwz	%r7,-16-(4*4)(%r28)
    80. 

  80. 	lwz	%r8,-16-(3*4)(%r28)
    81. 

  81. 	lwz	%r9,-16-(2*4)(%r28)
    82. 

  82. 	lwz	%r10,-16-(1*4)(%r28)
    83. 

  83. 	nop
    84. 

  84. 1:
    85. 

  85. 

  86. 	/* Load all the FP registers.  */
    87. 

  87. 	bf-	6,2f
    88. 

  88. 	lfd	%f1,-16-(8*4)-(8*8)(%r28)
    89. 

  89. 	lfd	%f2,-16-(8*4)-(7*8)(%r28)
    90. 

  90. 	lfd	%f3,-16-(8*4)-(6*8)(%r28)
    91. 

  91. 	lfd	%f4,-16-(8*4)-(5*8)(%r28)
    92. 

  92. 	nop
    93. 

  93. 	lfd	%f5,-16-(8*4)-(4*8)(%r28)
    94. 

  94. 	lfd	%f6,-16-(8*4)-(3*8)(%r28)
    95. 

  95. 	lfd	%f7,-16-(8*4)-(2*8)(%r28)
    96. 

  96. 	lfd	%f8,-16-(8*4)-(1*8)(%r28)
    97. 

  97. 2:
    98. 

  98. 

  99. 	/* Make the call.  */
    100. 

  100. 	bctrl
    101. 

  101. 

  102. 	/* Now, deal with the return value.  */
    103. 

  103. 	mtcrf	0x01,%r31 /* cr7  */
    104. 

  104. 	bt-	31,L(small_struct_return_value)
    105. 

  105. 	bt-	30,L(done_return_value)
    106. 

  106. 	bt-	29,L(fp_return_value)
    107. 

  107. 	stw	%r3,0(%r30)
    108. 

  108. 	bf+	28,L(done_return_value)
    109. 

  109. 	stw	%r4,4(%r30)
    110. 

  110. 	mtcrf	0x02,%r31 /* cr6  */
    111. 

  111. 	bf	27,L(done_return_value)
    112. 

  112. 	stw     %r5,8(%r30)
    113. 

  113. 	stw	%r6,12(%r30)
    114. 

  114. 	/* Fall through...  */
    115. 

  115. 

  116. L(done_return_value):
    117. 

  117. 	/* Restore the registers we used and return.  */
    118. 

  118. 	lwz	%r9,   4(%r28)
    119. 

  119. 	lwz	%r31, -4(%r28)
    120. 

  120. 	mtlr	%r9
    121. 

  121. 	lwz	%r30, -8(%r28)
    122. 

  122. 	lwz	%r29,-12(%r28)
    123. 

  123. 	lwz	%r28,-16(%r28)
    124. 

  124. 	lwz	%r1,0(%r1)
    125. 

  125. 	blr
    126. 

  126. 

  127. L(fp_return_value):
    128. 

  128. 	bf	28,L(float_return_value)
    129. 

  129. 	stfd	%f1,0(%r30)
    130. 

  130. 	mtcrf   0x02,%r31 /* cr6  */
    131. 

  131. 	bf	27,L(done_return_value)
    132. 

  132. 	stfd	%f2,8(%r30)
    133. 

  133. 	b	L(done_return_value)
    134. 

  134. L(float_return_value):
    135. 

  135. 	stfs	%f1,0(%r30)
    136. 

  136. 	b	L(done_return_value)
    137. 

  137. 

  138. L(small_struct_return_value):
    139. 

  139. 	mtcrf	0x10,%r31	/* cr3  */
    140. 

  140. 	bt-	15,L(smst_one_register)
    141. 

  141. 	mtcrf	0x08,%r31	/* cr4  */
    142. 

  142. 	bt-	16,L(smst_two_register)
    143. 

  143. 	b       L(done_return_value)
    144. 

  144. 

  145. L(smst_one_register):
    146. 

  146. 	rlwinm  %r5,%r31,5+23,32-5,31 /* Extract the value to shift.  */
    147. 

  147. 	slw	%r3,%r3,%r5
    148. 

  148. 	stw	%r3,0(%r30)
    149. 

  149. 	b	L(done_return_value)
    150. 

  150. L(smst_two_register):
    151. 

  151. 	rlwinm  %r5,%r31,5+23,32-5,31 /* Extract the value to shift.  */
    152. 

  152. 	cmpwi	%r5,0
    153. 

  153. 	subfic	%r9,%r5,32
    154. 

  154. 	slw	%r29,%r3,%r5
    155. 

  155. 	srw	%r9,%r4,%r9
    156. 

  156. 	beq-	L(smst_8byte)
    157. 

  157. 	or	%r3,%r9,%r29
    158. 

  158. 	slw	%r4,%r4,%r5
    159. 

  159. L(smst_8byte):
    160. 

  160. 	stw	%r3,0(%r30)
    161. 

  161. 	stw	%r4,4(%r30)
    162. 

  162. 	b	L(done_return_value)
    163. 

  163. 

  164. .LFE1:
    165. 

  165. END(ffi_call_SYSV)
    166. 

  166. 

  167.       .section	".eh_frame",EH_FRAME_FLAGS,@progbits
    168. 

  168. .Lframe1:
    169. 

  169.       .4byte    .LECIE1-.LSCIE1  /*  Length of Common Information Entry */
    170. 

  170. .LSCIE1:
    171. 

  171.       .4byte    0x0      /*  CIE Identifier Tag */
    172. 

  172.       .byte     0x1      /*  CIE Version */
    173. 

  173. #if defined _RELOCATABLE || defined __PIC__
    174. 

  174.       .ascii	"zR\0"   /*  CIE Augmentation */
    175. 

  175. #else
    176. 

  176.       .ascii	"\0"	 /*  CIE Augmentation */
    177. 

  177. #endif
    178. 

  178.       .uleb128  0x1      /*  CIE Code Alignment Factor */
    179. 

  179.       .sleb128  -4	 /*  CIE Data Alignment Factor */
    180. 

  180.       .byte     0x41     /*  CIE RA Column */
    181. 

  181. #if defined _RELOCATABLE || defined __PIC__
    182. 

  182.       .uleb128  0x1      /*  Augmentation size */
    183. 

  183.       .byte	0x1b	 /*  FDE Encoding (pcrel sdata4) */
    184. 

  184. #endif
    185. 

  185.       .byte     0xc      /*  DW_CFA_def_cfa */
    186. 

  186.       .uleb128  0x1
    187. 

  187.       .uleb128  0x0
    188. 

  188.       .align 2
    189. 

  189. .LECIE1:
    190. 

  190. .LSFDE1:
    191. 

  191.       .4byte    .LEFDE1-.LASFDE1         /*  FDE Length */
    192. 

  192. .LASFDE1:
    193. 

  193.       .4byte    .LASFDE1-.Lframe1         /*  FDE CIE offset */
    194. 

  194. #if defined _RELOCATABLE || defined __PIC__
    195. 

  195.       .4byte    .LFB1-.  /*  FDE initial location */
    196. 

  196. #else
    197. 

  197.       .4byte    .LFB1    /*  FDE initial location */
    198. 

  198. #endif
    199. 

  199.       .4byte    .LFE1-.LFB1      /*  FDE address range */
    200. 

  200. #if defined _RELOCATABLE || defined __PIC__
    201. 

  201.       .uleb128  0x0	 /*  Augmentation size */
    202. 

  202. #endif
    203. 

  203.       .byte     0x4      /*  DW_CFA_advance_loc4 */
    204. 

  204.       .4byte    .LCFI0-.LFB1
    205. 

  205.       .byte     0xd      /*  DW_CFA_def_cfa_register */
    206. 

  206.       .uleb128  0x08
    207. 

  207.       .byte     0x4      /*  DW_CFA_advance_loc4 */
    208. 

  208.       .4byte    .LCFI5-.LCFI0
    209. 

  209.       .byte     0x11     /*  DW_CFA_offset_extended_sf */
    210. 

  210.       .uleb128  0x41
    211. 

  211.       .sleb128  -1
    212. 

  212.       .byte     0x9f     /*  DW_CFA_offset, column 0x1f */
    213. 

  213.       .uleb128  0x1
    214. 

  214.       .byte     0x9e     /*  DW_CFA_offset, column 0x1e */
    215. 

  215.       .uleb128  0x2
    216. 

  216.       .byte     0x9d     /*  DW_CFA_offset, column 0x1d */
    217. 

  217.       .uleb128  0x3
    218. 

  218.       .byte     0x9c     /*  DW_CFA_offset, column 0x1c */
    219. 

  219.       .uleb128  0x4
    220. 

  220.       .byte     0x4      /*  DW_CFA_advance_loc4 */
    221. 

  221.       .4byte    .LCFI6-.LCFI5
    222. 

  222.       .byte     0xd      /*  DW_CFA_def_cfa_register */
    223. 

  223.       .uleb128  0x1c
    224. 

  224.       .align 2
    225. 

  225. .LEFDE1:
    226. 

  226. #endif
    227. 

  227. 

  228. #if defined __ELF__ && defined __linux__
    229. 

  229. 	.section	.note.GNU-stack,"",@progbits
    230. 

  230. #endif
    231.