/Modules/_ctypes/libffi_osx/powerpc/ppc-darwin_closure.S

  1#if defined(__ppc__)
  2
  3/* -----------------------------------------------------------------------
  4   ppc-darwin_closure.S - Copyright (c) 2002, 2003, 2004, Free Software Foundation,
  5   Inc. based on ppc_closure.S
  6
  7   PowerPC Assembly glue.
  8
  9   Permission is hereby granted, free of charge, to any person obtaining
 10   a copy of this software and associated documentation files (the
 11   ``Software''), to deal in the Software without restriction, including
 12   without limitation the rights to use, copy, modify, merge, publish,
 13   distribute, sublicense, and/or sell copies of the Software, and to
 14   permit persons to whom the Software is furnished to do so, subject to
 15   the following conditions:
 16
 17   The above copyright notice and this permission notice shall be included
 18   in all copies or substantial portions of the Software.
 19
 20   THE SOFTWARE IS PROVIDED ``AS IS'', WITHOUT WARRANTY OF ANY KIND, EXPRESS
 21   OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 22   MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
 23   IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY CLAIM, DAMAGES OR
 24   OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 25   ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 26   OTHER DEALINGS IN THE SOFTWARE.
 27   ----------------------------------------------------------------------- */
 28
 29#define LIBFFI_ASM
 30
 31#include <ffi.h>
 32#include <ppc-ffitarget.h>	// for FFI_TRAMPOLINE_SIZE
 33#include <ppc-darwin.h>
 34#include <architecture/ppc/mode_independent_asm.h>
 35
 36	.file	"ppc-darwin_closure.S"
 37.text
 38	.align	LOG2_GPR_BYTES
 39	.globl	_ffi_closure_ASM
 40
 41.text
 42	.align	LOG2_GPR_BYTES
 43
 44_ffi_closure_ASM:
 45LFB1:
 46	mflr	r0					// Save return address
 47	stg		r0,SF_RETURN(r1)
 48
 49LCFI0:
 50	/* 24/48 bytes (Linkage Area)
 51	   32/64 bytes (outgoing parameter area, always reserved)
 52	   104 bytes (13*8 from FPR)
 53	   16/32 bytes (result)
 54	   176/232 total bytes  */
 55
 56	/*	skip over caller save area and keep stack aligned to 16/32.	*/
 57	stgu	r1,-SF_ROUND(176)(r1)
 58
 59LCFI1:
 60	/* We want to build up an area for the parameters passed
 61	   in registers. (both floating point and integer)  */
 62
 63	/*	176/256 bytes (callee stack frame aligned to 16/32)
 64		24/48 bytes (caller linkage area)
 65		200/304 (start of caller parameter area aligned to 4/8)
 66	*/
 67
 68	/* Save GPRs 3 - 10 (aligned to 4/8)
 69	   in the parents outgoing area.  */
 70	stg		r3,200(r1)
 71	stg		r4,204(r1)
 72	stg		r5,208(r1)
 73	stg		r6,212(r1)
 74	stg		r7,216(r1)
 75	stg		r8,220(r1)
 76	stg		r9,224(r1)
 77	stg		r10,228(r1)
 78
 79	/* Save FPRs 1 - 13. (aligned to 8)  */
 80	stfd	f1,56(r1)
 81	stfd	f2,64(r1)
 82	stfd	f3,72(r1)
 83	stfd	f4,80(r1)
 84	stfd	f5,88(r1)
 85	stfd	f6,96(r1)
 86	stfd	f7,104(r1)
 87	stfd	f8,112(r1)
 88	stfd	f9,120(r1)
 89	stfd	f10,128(r1)
 90	stfd	f11,136(r1)
 91	stfd	f12,144(r1)
 92	stfd	f13,152(r1)
 93
 94	// Set up registers for the routine that actually does the work.
 95	mr		r3,r11		// context pointer from the trampoline
 96	addi	r4,r1,160	// result storage
 97	addi	r5,r1,200	// saved GPRs
 98	addi	r6,r1,56	// saved FPRs
 99	bl		Lffi_closure_helper_DARWIN$stub
100
101	/* Now r3 contains the return type. Use it to look up in a table
102	   so we know how to deal with each type.  */
103	addi	r5,r1,160				// Copy result storage pointer.
104	bl		Lget_ret_type0_addr		// Get pointer to Lret_type0 into LR.
105	mflr	r4						// Move to r4.
106	slwi	r3,r3,4					// Multiply return type by 16.
107	add		r3,r3,r4				// Add contents of table to table address.
108	mtctr	r3
109	bctr
110
111LFE1:
112/* Each of the ret_typeX code fragments has to be exactly 16 bytes long
113   (4 instructions). For cache effectiveness we align to a 16 byte boundary
114   first.  */
115	.align 4
116	nop
117	nop
118	nop
119
120Lget_ret_type0_addr:
121	blrl
122
123/* case FFI_TYPE_VOID  */
124Lret_type0:
125	b		Lfinish
126	nop
127	nop
128	nop
129
130/* case FFI_TYPE_INT  */
131Lret_type1:
132	lwz		r3,0(r5)
133	b		Lfinish
134	nop
135	nop
136
137/* case FFI_TYPE_FLOAT  */
138Lret_type2:
139	lfs		f1,0(r5)
140	b		Lfinish
141	nop
142	nop
143
144/* case FFI_TYPE_DOUBLE  */
145Lret_type3:
146	lfd		f1,0(r5)
147	b		Lfinish
148	nop
149	nop
150
151/* case FFI_TYPE_LONGDOUBLE  */
152Lret_type4:
153	lfd		f1,0(r5)
154	lfd		f2,8(r5)
155	b		Lfinish
156	nop
157
158/* case FFI_TYPE_UINT8  */
159Lret_type5:
160	lbz		r3,3(r5)
161	b		Lfinish
162	nop
163	nop
164
165/* case FFI_TYPE_SINT8  */
166Lret_type6:
167	lbz		r3,3(r5)
168	extsb	r3,r3
169	b		Lfinish
170	nop
171
172/* case FFI_TYPE_UINT16  */
173Lret_type7:
174	lhz		r3,2(r5)
175	b		Lfinish
176	nop
177	nop
178
179/* case FFI_TYPE_SINT16  */
180Lret_type8:
181	lha		r3,2(r5)
182	b		Lfinish
183	nop
184	nop
185
186/* case FFI_TYPE_UINT32  */
187Lret_type9:		// same as Lret_type1
188	lwz		r3,0(r5)
189	b		Lfinish
190	nop
191	nop
192
193/* case FFI_TYPE_SINT32  */
194Lret_type10:	// same as Lret_type1
195	lwz		r3,0(r5)
196	b		Lfinish
197	nop
198	nop
199
200/* case FFI_TYPE_UINT64  */
201Lret_type11:
202	lwz		r3,0(r5)
203	lwz		r4,4(r5)
204	b		Lfinish
205	nop
206
207/* case FFI_TYPE_SINT64  */
208Lret_type12:	// same as Lret_type11
209	lwz		r3,0(r5)
210	lwz		r4,4(r5)
211	b		Lfinish
212	nop
213
214/* case FFI_TYPE_STRUCT  */
215Lret_type13:
216	b		Lfinish
217	nop
218	nop
219	nop
220
221/* End 16-byte aligned cases */
222/* case FFI_TYPE_POINTER  */
223// This case assumes that FFI_TYPE_POINTER == FFI_TYPE_LAST. If more types
224// are added in future, the following code will need to be updated and
225// padded to 16 bytes.
226Lret_type14:
227	lg		r3,0(r5)
228	// fall through
229
230/* case done  */
231Lfinish:
232	addi	r1,r1,SF_ROUND(176)	// Restore stack pointer.
233	lg		r0,SF_RETURN(r1)	// Restore return address.
234	mtlr	r0					// Restore link register.
235	blr
236
237/* END(ffi_closure_ASM)  */
238
239.section __TEXT,__eh_frame,coalesced,no_toc+strip_static_syms+live_support
240EH_frame1:
241	.set	L$set$0,LECIE1-LSCIE1
242	.long	L$set$0		; Length of Common Information Entry
243LSCIE1:
244	.long	0x0			; CIE Identifier Tag
245	.byte	0x1			; CIE Version
246	.ascii	"zR\0"		; CIE Augmentation
247	.byte	0x1			; uleb128 0x1; CIE Code Alignment Factor
248	.byte	0x7c		; sleb128 -4; CIE Data Alignment Factor
249	.byte	0x41		; CIE RA Column
250	.byte	0x1			; uleb128 0x1; Augmentation size
251	.byte	0x10		; FDE Encoding (pcrel)
252	.byte	0xc			; DW_CFA_def_cfa
253	.byte	0x1			; uleb128 0x1
254	.byte	0x0			; uleb128 0x0
255	.align	LOG2_GPR_BYTES
256LECIE1:
257.globl _ffi_closure_ASM.eh
258_ffi_closure_ASM.eh:
259LSFDE1:
260	.set	L$set$1,LEFDE1-LASFDE1
261	.long	L$set$1		; FDE Length
262
263LASFDE1:
264	.long	LASFDE1-EH_frame1		; FDE CIE offset
265	.g_long	LFB1-.					; FDE initial location
266	.set	L$set$3,LFE1-LFB1
267	.g_long	L$set$3					; FDE address range
268	.byte   0x0						; uleb128 0x0; Augmentation size
269	.byte	0x4						; DW_CFA_advance_loc4
270	.set	L$set$3,LCFI1-LCFI0
271	.long	L$set$3
272	.byte	0xe						; DW_CFA_def_cfa_offset
273	.byte	176,1					; uleb128 176
274	.byte	0x4						; DW_CFA_advance_loc4
275	.set	L$set$4,LCFI0-LFB1
276	.long	L$set$4
277	.byte   0x11					; DW_CFA_offset_extended_sf
278	.byte	0x41					; uleb128 0x41
279	.byte   0x7e					; sleb128 -2
280	.align	LOG2_GPR_BYTES
281
282LEFDE1:
283.data
284	.align	LOG2_GPR_BYTES
285LDFCM0:
286.section __TEXT,__picsymbolstub1,symbol_stubs,pure_instructions,32
287	.align	LOG2_GPR_BYTES
288
289Lffi_closure_helper_DARWIN$stub:
290	.indirect_symbol _ffi_closure_helper_DARWIN
291	mflr	r0
292	bcl		20,31,LO$ffi_closure_helper_DARWIN
293
294LO$ffi_closure_helper_DARWIN:
295	mflr	r11
296	addis	r11,r11,ha16(L_ffi_closure_helper_DARWIN$lazy_ptr - LO$ffi_closure_helper_DARWIN)
297	mtlr	r0
298	lgu		r12,lo16(L_ffi_closure_helper_DARWIN$lazy_ptr - LO$ffi_closure_helper_DARWIN)(r11)
299	mtctr	r12
300	bctr
301
302.lazy_symbol_pointer
303L_ffi_closure_helper_DARWIN$lazy_ptr:
304	.indirect_symbol _ffi_closure_helper_DARWIN
305	.g_long dyld_stub_binding_helper
306
307
308#endif // __ppc__