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1/*
2 * include/asm-m32r/flat.h
3 *
4 * uClinux flat-format executables
5 *
6 * Copyright (C) 2004 Kazuhiro Inaoka
7 *
8 * This file is subject to the terms and conditions of the GNU General Public
9 * License. See the file "COPYING" in the main directory of this archive for
10 * more details.
11 */
12#ifndef __ASM_M32R_FLAT_H
13#define __ASM_M32R_FLAT_H
14
15#define flat_stack_align(sp) (*sp += (*sp & 3 ? (4 - (*sp & 3)): 0))
16#define flat_argvp_envp_on_stack() 0
17#define flat_old_ram_flag(flags) (flags)
18#define flat_set_persistent(relval, p) 0
19#define flat_reloc_valid(reloc, size) \
20 (((reloc) - textlen_for_m32r_lo16_data) <= (size))
21#define flat_get_addr_from_rp(rp, relval, flags, persistent) \
22 m32r_flat_get_addr_from_rp(rp, relval, (text_len) )
23
24#define flat_put_addr_at_rp(rp, addr, relval) \
25 m32r_flat_put_addr_at_rp(rp, addr, relval)
26
27/* Convert a relocation entry into an address. */
28static inline unsigned long
29flat_get_relocate_addr (unsigned long relval)
30{
31 return relval & 0x00ffffff; /* Mask out top 8-bits */
32}
33
34#define flat_m32r_get_reloc_type(relval) ((relval) >> 24)
35
36#define M32R_SETH_OPCODE 0xd0c00000 /* SETH instruction code */
37
38#define FLAT_M32R_32 0x00 /* 32bits reloc */
39#define FLAT_M32R_24 0x01 /* unsigned 24bits reloc */
40#define FLAT_M32R_16 0x02 /* 16bits reloc */
41#define FLAT_M32R_LO16 0x03 /* signed low 16bits reloc (low()) */
42#define FLAT_M32R_LO16_DATA 0x04 /* signed low 16bits reloc (low())
43 for a symbol in .data section */
44 /* High 16bits of an address used
45 when the lower 16bbits are treated
46 as unsigned.
47 To create SETH instruction only.
48 0x1X: X means a number of register.
49 0x10 - 0x3F are reserved. */
50#define FLAT_M32R_HI16_ULO 0x10 /* reloc for SETH Rn,#high(imm16) */
51 /* High 16bits of an address used
52 when the lower 16bbits are treated
53 as signed.
54 To create SETH instruction only.
55 0x2X: X means a number of register.
56 0x20 - 0x4F are reserved. */
57#define FLAT_M32R_HI16_SLO 0x20 /* reloc for SETH Rn,#shigh(imm16) */
58
59static unsigned long textlen_for_m32r_lo16_data = 0;
60
61static inline unsigned long m32r_flat_get_addr_from_rp (unsigned long *rp,
62 unsigned long relval,
63 unsigned long textlen)
64{
65 unsigned int reloc = flat_m32r_get_reloc_type (relval);
66 textlen_for_m32r_lo16_data = 0;
67 if (reloc & 0xf0) {
68 unsigned long addr = htonl(*rp);
69 switch (reloc & 0xf0)
70 {
71 case FLAT_M32R_HI16_ULO:
72 case FLAT_M32R_HI16_SLO:
73 if (addr == 0) {
74 /* put "seth Rn,#0x0" instead of 0 (addr). */
75 *rp = (M32R_SETH_OPCODE | ((reloc & 0x0f)<<24));
76 }
77 return addr;
78 default:
79 break;
80 }
81 } else {
82 switch (reloc)
83 {
84 case FLAT_M32R_LO16:
85 return htonl(*rp) & 0xFFFF;
86 case FLAT_M32R_LO16_DATA:
87 /* FIXME: The return value will decrease by textlen
88 at m32r_flat_put_addr_at_rp () */
89 textlen_for_m32r_lo16_data = textlen;
90 return (htonl(*rp) & 0xFFFF) + textlen;
91 case FLAT_M32R_16:
92 return htons(*(unsigned short *)rp) & 0xFFFF;
93 case FLAT_M32R_24:
94 return htonl(*rp) & 0xFFFFFF;
95 case FLAT_M32R_32:
96 return htonl(*rp);
97 default:
98 break;
99 }
100 }
101 return ~0; /* bogus value */
102}
103
104static inline void m32r_flat_put_addr_at_rp (unsigned long *rp,
105 unsigned long addr,
106 unsigned long relval)
107{
108 unsigned int reloc = flat_m32r_get_reloc_type (relval);
109 if (reloc & 0xf0) {
110 unsigned long Rn = reloc & 0x0f; /* get a number of register */
111 Rn <<= 24; /* 0x0R000000 */
112 reloc &= 0xf0;
113 switch (reloc)
114 {
115 case FLAT_M32R_HI16_ULO: /* To create SETH Rn,#high(imm16) */
116 *rp = (M32R_SETH_OPCODE | Rn
117 | ((addr >> 16) & 0xFFFF));
118 break;
119 case FLAT_M32R_HI16_SLO: /* To create SETH Rn,#shigh(imm16) */
120 *rp = (M32R_SETH_OPCODE | Rn
121 | (((addr >> 16) + ((addr & 0x8000) ? 1 : 0))
122 & 0xFFFF));
123 break;
124 }
125 } else {
126 switch (reloc) {
127 case FLAT_M32R_LO16_DATA:
128 addr -= textlen_for_m32r_lo16_data;
129 textlen_for_m32r_lo16_data = 0;
130 case FLAT_M32R_LO16:
131 *rp = (htonl(*rp) & 0xFFFF0000) | (addr & 0xFFFF);
132 break;
133 case FLAT_M32R_16:
134 *(unsigned short *)rp = addr & 0xFFFF;
135 break;
136 case FLAT_M32R_24:
137 *rp = (htonl(*rp) & 0xFF000000) | (addr & 0xFFFFFF);
138 break;
139 case FLAT_M32R_32:
140 *rp = addr;
141 break;
142 }
143 }
144}
145
146#endif /* __ASM_M32R_FLAT_H */