1/* -----------------------------------------------------------------------
2   sysv.h - Copyright (c) 1998 Geoffrey Keating
3
4   PowerPC Assembly glue.
5
6   Permission is hereby granted, free of charge, to any person obtaining
7   a copy of this software and associated documentation files (the
8   ``Software''), to deal in the Software without restriction, including
9   without limitation the rights to use, copy, modify, merge, publish,
10   distribute, sublicense, and/or sell copies of the Software, and to
11   permit persons to whom the Software is furnished to do so, subject to
12   the following conditions:
13
14   The above copyright notice and this permission notice shall be included
15   in all copies or substantial portions of the Software.
16
17   THE SOFTWARE IS PROVIDED ``AS IS'', WITHOUT WARRANTY OF ANY KIND, EXPRESS
18   OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
19   MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
20   IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY CLAIM, DAMAGES OR
21   OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
22   ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
23   OTHER DEALINGS IN THE SOFTWARE.
24   ----------------------------------------------------------------------- */
25
26#define LIBFFI_ASM
27#include <fficonfig.h>
28#include <ffi.h>
29#include <powerpc/asm.h>
30
31#ifndef __powerpc64__
32	.globl ffi_prep_args_SYSV
33ENTRY(ffi_call_SYSV)
34.LFB1:
35	/* Save the old stack pointer as AP.  */
36	mr	%r8,%r1
37
38.LCFI0:
39	/* Allocate the stack space we need.  */
40	stwux	%r1,%r1,%r4
41	/* Save registers we use.  */
42	mflr	%r9
43	stw	%r28,-16(%r8)
44.LCFI1:
45	stw	%r29,-12(%r8)
46.LCFI2:
47	stw	%r30, -8(%r8)
48.LCFI3:
49	stw	%r31, -4(%r8)
50.LCFI4:
51	stw	%r9,   4(%r8)
52.LCFI5:
53
54	/* Save arguments over call...  */
55	mr	%r31,%r5	/* flags, */
56	mr	%r30,%r6	/* rvalue, */
57	mr	%r29,%r7	/* function address, */
58	mr	%r28,%r8	/* our AP. */
59.LCFI6:
60
61	/* Call ffi_prep_args_SYSV.  */
62	mr	%r4,%r1
63	bl	JUMPTARGET(ffi_prep_args_SYSV)
64
65	/* Now do the call.  */
66	/* Set up cr1 with bits 4-7 of the flags.  */
67	mtcrf	0x40,%r31
68	/* Get the address to call into CTR.  */
69	mtctr	%r29
70	/* Load all those argument registers.  */
71	lwz	%r3,-16-(8*4)(%r28)
72	lwz	%r4,-16-(7*4)(%r28)
73	lwz	%r5,-16-(6*4)(%r28)
74	lwz	%r6,-16-(5*4)(%r28)
75	bf-	5,1f
76	nop
77	lwz	%r7,-16-(4*4)(%r28)
78	lwz	%r8,-16-(3*4)(%r28)
79	lwz	%r9,-16-(2*4)(%r28)
80	lwz	%r10,-16-(1*4)(%r28)
81	nop
821:
83
84	/* Load all the FP registers.  */
85	bf-	6,2f
86	lfd	%f1,-16-(8*4)-(8*8)(%r28)
87	lfd	%f2,-16-(8*4)-(7*8)(%r28)
88	lfd	%f3,-16-(8*4)-(6*8)(%r28)
89	lfd	%f4,-16-(8*4)-(5*8)(%r28)
90	nop
91	lfd	%f5,-16-(8*4)-(4*8)(%r28)
92	lfd	%f6,-16-(8*4)-(3*8)(%r28)
93	lfd	%f7,-16-(8*4)-(2*8)(%r28)
94	lfd	%f8,-16-(8*4)-(1*8)(%r28)
952:
96
97	/* Make the call.  */
98	bctrl
99
100	/* Now, deal with the return value.  */
101	mtcrf	0x01,%r31
102	bt-	30,L(done_return_value)
103	bt-	29,L(fp_return_value)
104	stw	%r3,0(%r30)
105	bf+	28,L(done_return_value)
106	stw	%r4,4(%r30)
107	/* Fall through...  */
108
109L(done_return_value):
110	/* Restore the registers we used and return.  */
111	lwz	%r9,   4(%r28)
112	lwz	%r31, -4(%r28)
113	mtlr	%r9
114	lwz	%r30, -8(%r28)
115	lwz	%r29,-12(%r28)
116	lwz	%r28,-16(%r28)
117	lwz	%r1,0(%r1)
118	blr
119
120L(fp_return_value):
121	bf	28,L(float_return_value)
122	stfd	%f1,0(%r30)
123	b	L(done_return_value)
124L(float_return_value):
125	stfs	%f1,0(%r30)
126	b	L(done_return_value)
127.LFE1:
128END(ffi_call_SYSV)
129
130      .section	".eh_frame",EH_FRAME_FLAGS,@progbits
131.Lframe1:
132      .4byte    .LECIE1-.LSCIE1  /*  Length of Common Information Entry */
133.LSCIE1:
134      .4byte    0x0      /*  CIE Identifier Tag */
135      .byte     0x1      /*  CIE Version */
136#if defined _RELOCATABLE || defined __PIC__
137      .ascii	"zR\0"   /*  CIE Augmentation */
138#else
139      .ascii	"\0"	 /*  CIE Augmentation */
140#endif
141      .uleb128  0x1      /*  CIE Code Alignment Factor */
142      .sleb128  -4	 /*  CIE Data Alignment Factor */
143      .byte     0x41     /*  CIE RA Column */
144#if defined _RELOCATABLE || defined __PIC__
145      .uleb128  0x1      /*  Augmentation size */
146      .byte	0x1b	 /*  FDE Encoding (pcrel sdata4) */
147#endif
148      .byte     0xc      /*  DW_CFA_def_cfa */
149      .uleb128  0x1
150      .uleb128  0x0
151      .align 2
152.LECIE1:
153.LSFDE1:
154      .4byte    .LEFDE1-.LASFDE1         /*  FDE Length */
155.LASFDE1:
156      .4byte    .LASFDE1-.Lframe1         /*  FDE CIE offset */
157#if defined _RELOCATABLE || defined __PIC__
158      .4byte    .LFB1-.  /*  FDE initial location */
159#else
160      .4byte    .LFB1    /*  FDE initial location */
161#endif
162      .4byte    .LFE1-.LFB1      /*  FDE address range */
163#if defined _RELOCATABLE || defined __PIC__
164      .uleb128  0x0	 /*  Augmentation size */
165#endif
166      .byte     0x4      /*  DW_CFA_advance_loc4 */
167      .4byte    .LCFI0-.LFB1
168      .byte     0xd      /*  DW_CFA_def_cfa_register */
169      .uleb128  0x08
170      .byte     0x4      /*  DW_CFA_advance_loc4 */
171      .4byte    .LCFI5-.LCFI0
172      .byte     0x2f     /*  DW_CFA_GNU_negative_offset_extended */
173      .uleb128  0x41
174      .uleb128  0x1
175      .byte     0x9f     /*  DW_CFA_offset, column 0x1f */
176      .uleb128  0x1
177      .byte     0x9e     /*  DW_CFA_offset, column 0x1e */
178      .uleb128  0x2
179      .byte     0x9d     /*  DW_CFA_offset, column 0x1d */
180      .uleb128  0x3
181      .byte     0x9c     /*  DW_CFA_offset, column 0x1c */
182      .uleb128  0x4
183      .byte     0x4      /*  DW_CFA_advance_loc4 */
184      .4byte    .LCFI6-.LCFI5
185      .byte     0xd      /*  DW_CFA_def_cfa_register */
186      .uleb128  0x1c
187      .align 2
188.LEFDE1:
189#endif
190