1 // SPDX-License-Identifier: GPL-2.0-only 1
2 /*
3 * Kernel module loader for Hexagon
4 *
5 * Copyright (c) 2010-2011, The Linux Foundati
6 */
7
8 #include <asm/module.h>
9 #include <linux/elf.h>
10 #include <linux/module.h>
11 #include <linux/moduleloader.h>
12 #include <linux/vmalloc.h>
13
14 #if 0
15 #define DEBUGP printk
16 #else
17 #define DEBUGP(fmt , ...)
18 #endif
19
20 /*
21 * module_frob_arch_sections - tweak got/plt s
22 * @hdr - pointer to elf header
23 * @sechdrs - pointer to elf load section head
24 * @secstrings - symbol names
25 * @mod - pointer to module
26 */
27 int module_frob_arch_sections(Elf_Ehdr *hdr, E
28 char *secstrin
29 struct module
30 {
31 unsigned int i;
32 int found = 0;
33
34 /* Look for .plt and/or .got.plt and/o
35 for (i = 0; i < hdr->e_shnum; i++) {
36 DEBUGP("Section %d is %s\n", i
37 secstrings + sechdrs[i]
38 if (strcmp(secstrings + sechdr
39 found = i+1;
40 if (strcmp(secstrings + sechdr
41 found = i+1;
42 if (strcmp(secstrings + sechdr
43 found = i+1;
44 }
45
46 /* At this time, we don't support modu
47 if (found) {
48 printk(KERN_WARNING
49 "Module '%s' contains
50 mod->name);
51 /* return -ENOEXEC; */
52 }
53
54 return 0;
55 }
56
57 /*
58 * apply_relocate_add - perform rela relocatio
59 * @sechdrs - pointer to section headers
60 * @strtab - some sort of start address?
61 * @symindex - symbol index offset or somethin
62 * @relsec - address to relocate to?
63 * @module - pointer to module
64 *
65 * Perform rela relocations.
66 */
67 int apply_relocate_add(Elf_Shdr *sechdrs, cons
68 unsigned int symindex,
69 struct module *module)
70 {
71 unsigned int i;
72 Elf32_Sym *sym;
73 uint32_t *location;
74 uint32_t value;
75 unsigned int nrelocs = sechdrs[relsec]
76 Elf32_Rela *rela = (void *)sechdrs[rel
77 Elf32_Word sym_info = sechdrs[relsec].
78 Elf32_Sym *sym_base = (Elf32_Sym *) se
79 void *loc_base = (void *) sechdrs[sym_
80
81 DEBUGP("Applying relocations in sectio
82 relsec, sym_info, loc_base);
83
84 for (i = 0; i < nrelocs; i++) {
85
86 /* Symbol to relocate */
87 sym = sym_base + ELF32_R_SYM(r
88
89 /* Where to make the change */
90 location = loc_base + rela[i].
91
92 /* `Everything is relative'. *
93 value = sym->st_value + rela[i
94
95 DEBUGP("%d: value=%08x loc=%p
96 i, value, location, ELF
97 sym->st_name ?
98 &strtab[sym->st_name] :
99
100 switch (ELF32_R_TYPE(rela[i].r
101 case R_HEXAGON_B22_PCREL: {
102 int dist = (int)(value
103 if ((dist < -0x0080000
104 (dist >= 0x0080000
105 printk(KERN_ER
106 "%s: %s
107 module-
108 "R_HEXA
109 dist, v
110 sym->st
111 &strtab
112 return -ENOEXE
113 }
114 DEBUGP("B22_PCREL cont
115 *location &= ~0x01ff3f
116 *location |= 0x00003ff
117 *location |= 0x01ff000
118 DEBUGP("Contents after
119 break;
120 }
121 case R_HEXAGON_HI16:
122 value = (value>>16) &
123 fallthrough;
124 case R_HEXAGON_LO16:
125 *location &= ~0x00c03f
126 *location |= value & 0
127 *location |= (value &
128 break;
129 case R_HEXAGON_32:
130 *location = value;
131 break;
132 case R_HEXAGON_32_PCREL:
133 *location = value - (u
134 break;
135 case R_HEXAGON_PLT_B22_PCREL:
136 case R_HEXAGON_GOTOFF_LO16:
137 case R_HEXAGON_GOTOFF_HI16:
138 printk(KERN_ERR "%s: G
139 module->name);
140 return -ENOEXEC;
141 default:
142 printk(KERN_ERR "%s: u
143 module->name,
144 ELF32_R_TYPE(re
145 return -ENOEXEC;
146 }
147 }
148 return 0;
149 }
150
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