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tramp_table_c6000.c
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1 /*
2  * tramp_table_c6000.c
3  *
4  * DSP-BIOS Bridge driver support functions for TI OMAP processors.
5  *
6  * Copyright (C) 2005-2006 Texas Instruments, Inc.
7  *
8  * This package is free software; you can redistribute it and/or modify
9  * it under the terms of the GNU General Public License version 2 as
10  * published by the Free Software Foundation.
11  *
12  * THIS PACKAGE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
13  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
14  * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
15  */
16 
17 #include "dload_internal.h"
18 
19 /* These are defined in coff.h, but may not be available on all platforms
20  so we'll go ahead and define them here. */
21 #ifndef R_C60LO16
22 #define R_C60LO16 0x54 /* C60: MVK Low Half Register */
23 #define R_C60HI16 0x55 /* C60: MVKH/MVKLH High Half Register */
24 #endif
25 
26 #define C6X_TRAMP_WORD_COUNT 8
27 #define C6X_TRAMP_MAX_RELOS 8
28 
29 /* THIS HASH FUNCTION MUST MATCH THE ONE reloc_table_c6000.c */
30 #define HASH_FUNC(zz) (((((zz) + 1) * 1845UL) >> 11) & 63)
31 
32 /* THIS MUST MATCH reloc_record_t FOR A SYMBOL BASED RELO */
33 struct c6000_relo_record {
34  s32 vaddr;
35  s32 symndx;
36 #ifndef _BIG_ENDIAN
37  u16 disp;
38  u16 type;
39 #else
40  u16 type;
41  u16 disp;
42 #endif
43 };
44 
45 struct c6000_gen_code {
46  struct tramp_gen_code_hdr hdr;
47  u32 tramp_instrs[C6X_TRAMP_WORD_COUNT];
48  struct c6000_relo_record relos[C6X_TRAMP_MAX_RELOS];
49 };
50 
51 /* Hash mapping for relos that can cause trampolines. */
52 static const u16 tramp_map[] = {
53  65535,
54  65535,
55  65535,
56  65535,
57  65535,
58  65535,
59  65535,
60  65535,
61  65535,
62  65535,
63  0,
64  65535,
65  65535,
66  65535,
67  65535,
68  65535,
69  65535,
70  65535,
71  65535,
72  65535,
73  65535,
74  65535,
75  65535,
76  65535,
77  65535,
78  65535,
79  65535,
80  65535,
81  65535,
82  65535,
83  65535,
84  65535,
85  65535,
86  65535,
87  65535,
88  65535,
89  65535,
90  65535,
91  65535,
92  65535,
93  65535,
94  65535,
95  65535,
96  65535,
97  65535,
98  65535,
99  65535,
100  65535,
101  65535,
102  65535,
103  65535,
104  65535,
105  65535,
106  65535,
107  65535,
108  65535,
109  65535,
110  65535,
111  65535,
112  65535,
113  65535,
114  65535,
115  65535,
116  65535
117 };
118 
119 static const struct c6000_gen_code tramp_gen_info[] = {
120  /* Tramp caused by R_C60PCR21 */
121  {
122  /* Header - 8 instructions, 2 relos */
123  {
124  sizeof(u32) * C6X_TRAMP_WORD_COUNT,
125  2,
126  FIELD_OFFSET(struct c6000_gen_code, relos)
127  },
128 
129  /* Trampoline instructions */
130  {
131  0x053C54F7, /* STW.D2T2 B10, *sp--[2] */
132  0x0500002A, /* || MVK.S2 <blank>, B10 */
133  0x0500006A, /* MVKH.S2 <blank>, B10 */
134  0x00280362, /* B.S2 B10 */
135  0x053C52E6, /* LDW.D2T2 *++sp[2], B10 */
136  0x00006000, /* NOP 4 */
137  0x00000000, /* NOP */
138  0x00000000 /* NOP */
139  },
140 
141  /* Relocations */
142  {
143  {4, 0, 0, R_C60LO16},
144  {8, 0, 0, R_C60HI16},
145  {0, 0, 0, 0x0000},
146  {0, 0, 0, 0x0000},
147  {0, 0, 0, 0x0000},
148  {0, 0, 0, 0x0000},
149  {0, 0, 0, 0x0000},
150  {0, 0, 0, 0x0000}
151  }
152  }
153 };
154 
155 /* TARGET SPECIFIC FUNCTIONS THAT MUST BE DEFINED */
156 static u32 tramp_size_get(void)
157 {
158  return sizeof(u32) * C6X_TRAMP_WORD_COUNT;
159 }
160 
161 static u32 tramp_img_pkt_size_get(void)
162 {
163  return sizeof(struct c6000_gen_code);
164 }
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