1 // SPDX-License-Identifier: GPL-2.0-only <<
2 /* 1 /*
3 * Kernel module loader for Hexagon !! 2 * This file is subject to the terms and conditions of the GNU General Public
4 * !! 3 * License. See the file COPYING in the main directory of this archive
5 * Copyright (c) 2010-2011, The Linux Foundati !! 4 * for more details.
6 */ 5 */
7 6
8 #include <asm/module.h> <<
9 #include <linux/elf.h> <<
10 #include <linux/module.h> <<
11 #include <linux/moduleloader.h> 7 #include <linux/moduleloader.h>
>> 8 #include <linux/elf.h>
12 #include <linux/vmalloc.h> 9 #include <linux/vmalloc.h>
>> 10 #include <linux/fs.h>
>> 11 #include <linux/string.h>
>> 12 #include <linux/kernel.h>
13 13
14 #if 0 14 #if 0
15 #define DEBUGP printk !! 15 #define DEBUGP(fmt, ...) printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
16 #else 16 #else
17 #define DEBUGP(fmt , ...) !! 17 #define DEBUGP(fmt, ...) no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
18 #endif 18 #endif
19 19
20 /* !! 20 #ifdef CONFIG_MODULES
21 * module_frob_arch_sections - tweak got/plt s !! 21
22 * @hdr - pointer to elf header !! 22 int apply_relocate(Elf32_Shdr *sechdrs,
23 * @sechdrs - pointer to elf load section head !! 23 const char *strtab,
24 * @secstrings - symbol names !! 24 unsigned int symindex,
25 * @mod - pointer to module !! 25 unsigned int relsec,
26 */ !! 26 struct module *me)
27 int module_frob_arch_sections(Elf_Ehdr *hdr, E <<
28 char *secstrin <<
29 struct module <<
30 { 27 {
31 unsigned int i; 28 unsigned int i;
32 int found = 0; !! 29 Elf32_Rel *rel = (void *)sechdrs[relsec].sh_addr;
33 !! 30 Elf32_Sym *sym;
34 /* Look for .plt and/or .got.plt and/o !! 31 uint32_t *location;
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 32
46 /* At this time, we don't support modu !! 33 DEBUGP("Applying relocate section %u to %u\n", relsec,
47 if (found) { !! 34 sechdrs[relsec].sh_info);
48 printk(KERN_WARNING !! 35 for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
49 "Module '%s' contains !! 36 /* This is where to make the change */
50 mod->name); !! 37 location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr
51 /* return -ENOEXEC; */ !! 38 + rel[i].r_offset;
>> 39 /* This is the symbol it is referring to. Note that all
>> 40 undefined symbols have been resolved. */
>> 41 sym = (Elf32_Sym *)sechdrs[symindex].sh_addr
>> 42 + ELF32_R_SYM(rel[i].r_info);
>> 43
>> 44 switch (ELF32_R_TYPE(rel[i].r_info)) {
>> 45 case R_68K_32:
>> 46 /* We add the value into the location given */
>> 47 *location += sym->st_value;
>> 48 break;
>> 49 case R_68K_PC32:
>> 50 /* Add the value, subtract its position */
>> 51 *location += sym->st_value - (uint32_t)location;
>> 52 break;
>> 53 default:
>> 54 pr_err("module %s: Unknown relocation: %u\n", me->name,
>> 55 ELF32_R_TYPE(rel[i].r_info));
>> 56 return -ENOEXEC;
>> 57 }
52 } 58 }
53 <<
54 return 0; 59 return 0;
55 } 60 }
56 61
57 /* !! 62 int apply_relocate_add(Elf32_Shdr *sechdrs,
58 * apply_relocate_add - perform rela relocatio !! 63 const char *strtab,
59 * @sechdrs - pointer to section headers !! 64 unsigned int symindex,
60 * @strtab - some sort of start address? !! 65 unsigned int relsec,
61 * @symindex - symbol index offset or somethin !! 66 struct module *me)
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 { 67 {
71 unsigned int i; 68 unsigned int i;
>> 69 Elf32_Rela *rel = (void *)sechdrs[relsec].sh_addr;
72 Elf32_Sym *sym; 70 Elf32_Sym *sym;
73 uint32_t *location; 71 uint32_t *location;
74 uint32_t value; !! 72
75 unsigned int nrelocs = sechdrs[relsec] !! 73 DEBUGP("Applying relocate_add section %u to %u\n", relsec,
76 Elf32_Rela *rela = (void *)sechdrs[rel !! 74 sechdrs[relsec].sh_info);
77 Elf32_Word sym_info = sechdrs[relsec]. !! 75 for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
78 Elf32_Sym *sym_base = (Elf32_Sym *) se !! 76 /* This is where to make the change */
79 void *loc_base = (void *) sechdrs[sym_ !! 77 location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr
80 !! 78 + rel[i].r_offset;
81 DEBUGP("Applying relocations in sectio !! 79 /* This is the symbol it is referring to. Note that all
82 relsec, sym_info, loc_base); !! 80 undefined symbols have been resolved. */
83 !! 81 sym = (Elf32_Sym *)sechdrs[symindex].sh_addr
84 for (i = 0; i < nrelocs; i++) { !! 82 + ELF32_R_SYM(rel[i].r_info);
85 !! 83
86 /* Symbol to relocate */ !! 84 switch (ELF32_R_TYPE(rel[i].r_info)) {
87 sym = sym_base + ELF32_R_SYM(r !! 85 case R_68K_32:
88 !! 86 /* We add the value into the location given */
89 /* Where to make the change */ !! 87 *location = rel[i].r_addend + sym->st_value;
90 location = loc_base + rela[i]. !! 88 break;
91 !! 89 case R_68K_PC32:
92 /* `Everything is relative'. * !! 90 /* Add the value, subtract its position */
93 value = sym->st_value + rela[i !! 91 *location = rel[i].r_addend + sym->st_value - (uint32_t)location;
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; 92 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: 93 default:
142 printk(KERN_ERR "%s: u !! 94 pr_err("module %s: Unknown relocation: %u\n", me->name,
143 module->name, !! 95 ELF32_R_TYPE(rel[i].r_info));
144 ELF32_R_TYPE(re <<
145 return -ENOEXEC; 96 return -ENOEXEC;
146 } 97 }
147 } 98 }
148 return 0; 99 return 0;
>> 100 }
>> 101
>> 102 int module_finalize(const Elf_Ehdr *hdr,
>> 103 const Elf_Shdr *sechdrs,
>> 104 struct module *mod)
>> 105 {
>> 106 module_fixup(mod, mod->arch.fixup_start, mod->arch.fixup_end);
>> 107 return 0;
>> 108 }
>> 109
>> 110 #endif /* CONFIG_MODULES */
>> 111
>> 112 void module_fixup(struct module *mod, struct m68k_fixup_info *start,
>> 113 struct m68k_fixup_info *end)
>> 114 {
>> 115 #ifdef CONFIG_MMU
>> 116 struct m68k_fixup_info *fixup;
>> 117
>> 118 for (fixup = start; fixup < end; fixup++) {
>> 119 switch (fixup->type) {
>> 120 case m68k_fixup_memoffset:
>> 121 *(u32 *)fixup->addr = m68k_memoffset;
>> 122 break;
>> 123 case m68k_fixup_vnode_shift:
>> 124 *(u16 *)fixup->addr += m68k_virt_to_node_shift;
>> 125 break;
>> 126 }
>> 127 }
>> 128 #endif
149 } 129 }
150 130
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