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

http://unladen-swallow.googlecode.com/
Assembly | 230 lines | 210 code | 20 blank | 0 comment | 5 complexity | 889b214acb97d36fa25441c00a9a0ea1 MD5 | raw file
  1/* -----------------------------------------------------------------------
  2   sysv.S - Copyright (c) 1998 Geoffrey Keating
  3   Copyright (C) 2007 Free Software Foundation, Inc
  4
  5   PowerPC Assembly glue.
  6
  7   Permission is hereby granted, free of charge, to any person obtaining
  8   a copy of this software and associated documentation files (the
  9   ``Software''), to deal in the Software without restriction, including
 10   without limitation the rights to use, copy, modify, merge, publish,
 11   distribute, sublicense, and/or sell copies of the Software, and to
 12   permit persons to whom the Software is furnished to do so, subject to
 13   the following conditions:
 14
 15   The above copyright notice and this permission notice shall be included
 16   in all copies or substantial portions of the Software.
 17
 18   THE SOFTWARE IS PROVIDED ``AS IS'', WITHOUT WARRANTY OF ANY KIND,
 19   EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 20   MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 21   NONINFRINGEMENT.  IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
 22   HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
 23   WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 24   OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 25   DEALINGS IN THE SOFTWARE.
 26   ----------------------------------------------------------------------- */
 27
 28#define LIBFFI_ASM
 29#include <fficonfig.h>
 30#include <ffi.h>
 31#include <powerpc/asm.h>
 32
 33#ifndef __powerpc64__
 34	.globl ffi_prep_args_SYSV
 35ENTRY(ffi_call_SYSV)
 36.LFB1:
 37	/* Save the old stack pointer as AP.  */
 38	mr	%r8,%r1
 39
 40.LCFI0:
 41	/* Allocate the stack space we need.  */
 42	stwux	%r1,%r1,%r4
 43	/* Save registers we use.  */
 44	mflr	%r9
 45	stw	%r28,-16(%r8)
 46.LCFI1:
 47	stw	%r29,-12(%r8)
 48.LCFI2:
 49	stw	%r30, -8(%r8)
 50.LCFI3:
 51	stw	%r31, -4(%r8)
 52.LCFI4:
 53	stw	%r9,   4(%r8)
 54.LCFI5:
 55
 56	/* Save arguments over call...  */
 57	mr	%r31,%r5	/* flags, */
 58	mr	%r30,%r6	/* rvalue, */
 59	mr	%r29,%r7	/* function address, */
 60	mr	%r28,%r8	/* our AP. */
 61.LCFI6:
 62
 63	/* Call ffi_prep_args_SYSV.  */
 64	mr	%r4,%r1
 65	bl	ffi_prep_args_SYSV@local
 66
 67	/* Now do the call.  */
 68	/* Set up cr1 with bits 4-7 of the flags.  */
 69	mtcrf	0x40,%r31
 70	/* Get the address to call into CTR.  */
 71	mtctr	%r29
 72	/* Load all those argument registers.  */
 73	lwz	%r3,-16-(8*4)(%r28)
 74	lwz	%r4,-16-(7*4)(%r28)
 75	lwz	%r5,-16-(6*4)(%r28)
 76	lwz	%r6,-16-(5*4)(%r28)
 77	bf-	5,1f
 78	nop
 79	lwz	%r7,-16-(4*4)(%r28)
 80	lwz	%r8,-16-(3*4)(%r28)
 81	lwz	%r9,-16-(2*4)(%r28)
 82	lwz	%r10,-16-(1*4)(%r28)
 83	nop
 841:
 85
 86	/* Load all the FP registers.  */
 87	bf-	6,2f
 88	lfd	%f1,-16-(8*4)-(8*8)(%r28)
 89	lfd	%f2,-16-(8*4)-(7*8)(%r28)
 90	lfd	%f3,-16-(8*4)-(6*8)(%r28)
 91	lfd	%f4,-16-(8*4)-(5*8)(%r28)
 92	nop
 93	lfd	%f5,-16-(8*4)-(4*8)(%r28)
 94	lfd	%f6,-16-(8*4)-(3*8)(%r28)
 95	lfd	%f7,-16-(8*4)-(2*8)(%r28)
 96	lfd	%f8,-16-(8*4)-(1*8)(%r28)
 972:
 98
 99	/* Make the call.  */
100	bctrl
101
102	/* Now, deal with the return value.  */
103	mtcrf	0x01,%r31 /* cr7  */
104	bt-	31,L(small_struct_return_value)
105	bt-	30,L(done_return_value)
106	bt-	29,L(fp_return_value)
107	stw	%r3,0(%r30)
108	bf+	28,L(done_return_value)
109	stw	%r4,4(%r30)
110	mtcrf	0x02,%r31 /* cr6  */
111	bf	27,L(done_return_value)
112	stw     %r5,8(%r30)
113	stw	%r6,12(%r30)
114	/* Fall through...  */
115
116L(done_return_value):
117	/* Restore the registers we used and return.  */
118	lwz	%r9,   4(%r28)
119	lwz	%r31, -4(%r28)
120	mtlr	%r9
121	lwz	%r30, -8(%r28)
122	lwz	%r29,-12(%r28)
123	lwz	%r28,-16(%r28)
124	lwz	%r1,0(%r1)
125	blr
126
127L(fp_return_value):
128	bf	28,L(float_return_value)
129	stfd	%f1,0(%r30)
130	mtcrf   0x02,%r31 /* cr6  */
131	bf	27,L(done_return_value)
132	stfd	%f2,8(%r30)
133	b	L(done_return_value)
134L(float_return_value):
135	stfs	%f1,0(%r30)
136	b	L(done_return_value)
137
138L(small_struct_return_value):
139	mtcrf	0x10,%r31	/* cr3  */
140	bt-	15,L(smst_one_register)
141	mtcrf	0x08,%r31	/* cr4  */
142	bt-	16,L(smst_two_register)
143	b       L(done_return_value)
144
145L(smst_one_register):
146	rlwinm  %r5,%r31,5+23,32-5,31 /* Extract the value to shift.  */
147	slw	%r3,%r3,%r5
148	stw	%r3,0(%r30)
149	b	L(done_return_value)
150L(smst_two_register):
151	rlwinm  %r5,%r31,5+23,32-5,31 /* Extract the value to shift.  */
152	cmpwi	%r5,0
153	subfic	%r9,%r5,32
154	slw	%r29,%r3,%r5
155	srw	%r9,%r4,%r9
156	beq-	L(smst_8byte)
157	or	%r3,%r9,%r29
158	slw	%r4,%r4,%r5
159L(smst_8byte):
160	stw	%r3,0(%r30)
161	stw	%r4,4(%r30)
162	b	L(done_return_value)
163
164.LFE1:
165END(ffi_call_SYSV)
166
167      .section	".eh_frame",EH_FRAME_FLAGS,@progbits
168.Lframe1:
169      .4byte    .LECIE1-.LSCIE1  /*  Length of Common Information Entry */
170.LSCIE1:
171      .4byte    0x0      /*  CIE Identifier Tag */
172      .byte     0x1      /*  CIE Version */
173#if defined _RELOCATABLE || defined __PIC__
174      .ascii	"zR\0"   /*  CIE Augmentation */
175#else
176      .ascii	"\0"	 /*  CIE Augmentation */
177#endif
178      .uleb128  0x1      /*  CIE Code Alignment Factor */
179      .sleb128  -4	 /*  CIE Data Alignment Factor */
180      .byte     0x41     /*  CIE RA Column */
181#if defined _RELOCATABLE || defined __PIC__
182      .uleb128  0x1      /*  Augmentation size */
183      .byte	0x1b	 /*  FDE Encoding (pcrel sdata4) */
184#endif
185      .byte     0xc      /*  DW_CFA_def_cfa */
186      .uleb128  0x1
187      .uleb128  0x0
188      .align 2
189.LECIE1:
190.LSFDE1:
191      .4byte    .LEFDE1-.LASFDE1         /*  FDE Length */
192.LASFDE1:
193      .4byte    .LASFDE1-.Lframe1         /*  FDE CIE offset */
194#if defined _RELOCATABLE || defined __PIC__
195      .4byte    .LFB1-.  /*  FDE initial location */
196#else
197      .4byte    .LFB1    /*  FDE initial location */
198#endif
199      .4byte    .LFE1-.LFB1      /*  FDE address range */
200#if defined _RELOCATABLE || defined __PIC__
201      .uleb128  0x0	 /*  Augmentation size */
202#endif
203      .byte     0x4      /*  DW_CFA_advance_loc4 */
204      .4byte    .LCFI0-.LFB1
205      .byte     0xd      /*  DW_CFA_def_cfa_register */
206      .uleb128  0x08
207      .byte     0x4      /*  DW_CFA_advance_loc4 */
208      .4byte    .LCFI5-.LCFI0
209      .byte     0x11     /*  DW_CFA_offset_extended_sf */
210      .uleb128  0x41
211      .sleb128  -1
212      .byte     0x9f     /*  DW_CFA_offset, column 0x1f */
213      .uleb128  0x1
214      .byte     0x9e     /*  DW_CFA_offset, column 0x1e */
215      .uleb128  0x2
216      .byte     0x9d     /*  DW_CFA_offset, column 0x1d */
217      .uleb128  0x3
218      .byte     0x9c     /*  DW_CFA_offset, column 0x1c */
219      .uleb128  0x4
220      .byte     0x4      /*  DW_CFA_advance_loc4 */
221      .4byte    .LCFI6-.LCFI5
222      .byte     0xd      /*  DW_CFA_def_cfa_register */
223      .uleb128  0x1c
224      .align 2
225.LEFDE1:
226#endif
227
228#if defined __ELF__ && defined __linux__
229	.section	.note.GNU-stack,"",@progbits
230#endif