Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * include/asm-v850/flat.h -- uClinux flat-format executables | |
3 | * | |
4 | * Copyright (C) 2002,03 NEC Electronics Corporation | |
5 | * Copyright (C) 2002,03 Miles Bader <miles@gnu.org> | |
6 | * | |
7 | * This file is subject to the terms and conditions of the GNU General | |
8 | * Public License. See the file COPYING in the main directory of this | |
9 | * archive for more details. | |
10 | * | |
11 | * Written by Miles Bader <miles@gnu.org> | |
12 | */ | |
13 | ||
14 | #ifndef __V850_FLAT_H__ | |
15 | #define __V850_FLAT_H__ | |
16 | ||
17 | /* The amount by which a relocation can exceed the program image limits | |
18 | without being regarded as an error. On the v850, the relocations of | |
19 | some base-pointers can be offset by 0x8000 (to allow better usage of the | |
20 | space offered by 16-bit signed offsets -- in most cases the offsets used | |
21 | with such a base-pointer will be negative). */ | |
22 | ||
23 | #define flat_reloc_valid(reloc, size) ((reloc) <= (size + 0x8000)) | |
24 | ||
25 | #define flat_stack_align(sp) /* nothing needed */ | |
26 | #define flat_argvp_envp_on_stack() 0 | |
27 | #define flat_old_ram_flag(flags) (flags) | |
28 | ||
29 | /* We store the type of relocation in the top 4 bits of the `relval.' */ | |
30 | ||
31 | /* Convert a relocation entry into an address. */ | |
32 | static inline unsigned long | |
33 | flat_get_relocate_addr (unsigned long relval) | |
34 | { | |
35 | return relval & 0x0fffffff; /* Mask out top 4-bits */ | |
36 | } | |
37 | ||
38 | #define flat_v850_get_reloc_type(relval) ((relval) >> 28) | |
39 | ||
40 | #define FLAT_V850_R_32 0 /* Normal 32-bit reloc */ | |
41 | #define FLAT_V850_R_HI16S_LO15 1 /* High 16-bits + signed 15-bit low field */ | |
42 | #define FLAT_V850_R_HI16S_LO16 2 /* High 16-bits + signed 16-bit low field */ | |
43 | ||
44 | /* Extract the address to be relocated from the symbol reference at RP; | |
45 | RELVAL is the raw relocation-table entry from which RP is derived. | |
46 | For the v850, RP should always be half-word aligned. */ | |
47 | static inline unsigned long flat_get_addr_from_rp (unsigned long *rp, | |
48 | unsigned long relval, | |
49 | unsigned long flags) | |
50 | { | |
51 | short *srp = (short *)rp; | |
52 | ||
53 | switch (flat_v850_get_reloc_type (relval)) | |
54 | { | |
55 | case FLAT_V850_R_32: | |
56 | /* Simple 32-bit address. */ | |
57 | return srp[0] | (srp[1] << 16); | |
58 | ||
59 | case FLAT_V850_R_HI16S_LO16: | |
60 | /* The high and low halves of the address are in the 16 | |
61 | bits at RP, and the 2nd word of the 32-bit instruction | |
62 | following that, respectively. The low half is _signed_ | |
63 | so we have to sign-extend it and add it to the upper | |
64 | half instead of simply or-ing them together. | |
65 | ||
66 | Unlike most relocated address, this one is stored in | |
67 | native (little-endian) byte-order to avoid problems with | |
68 | trashing the low-order bit, so we have to convert to | |
69 | network-byte-order before returning, as that's what the | |
70 | caller expects. */ | |
71 | return htonl ((srp[0] << 16) + srp[2]); | |
72 | ||
73 | case FLAT_V850_R_HI16S_LO15: | |
74 | /* The high and low halves of the address are in the 16 | |
75 | bits at RP, and the upper 15 bits of the 2nd word of the | |
76 | 32-bit instruction following that, respectively. The | |
77 | low half is _signed_ so we have to sign-extend it and | |
78 | add it to the upper half instead of simply or-ing them | |
79 | together. The lowest bit is always zero. | |
80 | ||
81 | Unlike most relocated address, this one is stored in | |
82 | native (little-endian) byte-order to avoid problems with | |
83 | trashing the low-order bit, so we have to convert to | |
84 | network-byte-order before returning, as that's what the | |
85 | caller expects. */ | |
86 | return htonl ((srp[0] << 16) + (srp[2] & ~0x1)); | |
87 | ||
88 | default: | |
89 | return ~0; /* bogus value */ | |
90 | } | |
91 | } | |
92 | ||
93 | /* Insert the address ADDR into the symbol reference at RP; | |
94 | RELVAL is the raw relocation-table entry from which RP is derived. | |
95 | For the v850, RP should always be half-word aligned. */ | |
96 | static inline void flat_put_addr_at_rp (unsigned long *rp, unsigned long addr, | |
97 | unsigned long relval) | |
98 | { | |
99 | short *srp = (short *)rp; | |
100 | ||
101 | switch (flat_v850_get_reloc_type (relval)) { | |
102 | case FLAT_V850_R_32: | |
103 | /* Simple 32-bit address. */ | |
104 | srp[0] = addr & 0xFFFF; | |
105 | srp[1] = (addr >> 16); | |
106 | break; | |
107 | ||
108 | case FLAT_V850_R_HI16S_LO16: | |
109 | /* The high and low halves of the address are in the 16 | |
110 | bits at RP, and the 2nd word of the 32-bit instruction | |
111 | following that, respectively. The low half is _signed_ | |
112 | so we must carry its sign bit to the upper half before | |
113 | writing the upper half. */ | |
114 | srp[0] = (addr >> 16) + ((addr >> 15) & 0x1); | |
115 | srp[2] = addr & 0xFFFF; | |
116 | break; | |
117 | ||
118 | case FLAT_V850_R_HI16S_LO15: | |
119 | /* The high and low halves of the address are in the 16 | |
120 | bits at RP, and the upper 15 bits of the 2nd word of the | |
121 | 32-bit instruction following that, respectively. The | |
122 | low half is _signed_ so we must carry its sign bit to | |
123 | the upper half before writing the upper half. The | |
124 | lowest bit we preserve from the existing instruction. */ | |
125 | srp[0] = (addr >> 16) + ((addr >> 15) & 0x1); | |
126 | srp[2] = (addr & 0xFFFE) | (srp[2] & 0x1); | |
127 | break; | |
128 | } | |
129 | } | |
130 | ||
131 | #endif /* __V850_FLAT_H__ */ |