1 // SPDX-License-Identifier: GPL-2.0
2 /* Kernel module help for sparc64.
3 *
4 * Copyright (C) 2001 Rusty Russell.
5 * Copyright (C) 2002 David S. Miller.
6 */
7
8 #include <linux/moduleloader.h>
9 #include <linux/kernel.h>
10 #include <linux/elf.h>
11 #include <linux/vmalloc.h>
12 #include <linux/fs.h>
13 #include <linux/gfp.h>
14 #include <linux/string.h>
15 #include <linux/ctype.h>
16 #include <linux/mm.h>
17
18 #include <asm/processor.h>
19 #include <asm/spitfire.h>
20 #include <asm/cacheflush.h>
21
22 #include "entry.h"
23
24 /* Make generic code ignore STT_REGISTER dummy undefined symbols. */
25 int module_frob_arch_sections(Elf_Ehdr *hdr,
26 Elf_Shdr *sechdrs,
27 char *secstrings,
28 struct module *mod)
29 {
30 unsigned int symidx;
31 Elf_Sym *sym;
32 char *strtab;
33 int i;
34
35 for (symidx = 0; sechdrs[symidx].sh_type != SHT_SYMTAB; symidx++) {
36 if (symidx == hdr->e_shnum-1) {
37 printk("%s: no symtab found.\n", mod->name);
38 return -ENOEXEC;
39 }
40 }
41 sym = (Elf_Sym *)sechdrs[symidx].sh_addr;
42 strtab = (char *)sechdrs[sechdrs[symidx].sh_link].sh_addr;
43
44 for (i = 1; i < sechdrs[symidx].sh_size / sizeof(Elf_Sym); i++) {
45 if (sym[i].st_shndx == SHN_UNDEF) {
46 if (ELF_ST_TYPE(sym[i].st_info) == STT_REGISTER)
47 sym[i].st_shndx = SHN_ABS;
48 }
49 }
50 return 0;
51 }
52
53 int apply_relocate_add(Elf_Shdr *sechdrs,
54 const char *strtab,
55 unsigned int symindex,
56 unsigned int relsec,
57 struct module *me)
58 {
59 unsigned int i;
60 Elf_Rela *rel = (void *)sechdrs[relsec].sh_addr;
61 Elf_Sym *sym;
62 u8 *location;
63 u32 *loc32;
64
65 for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
66 Elf_Addr v;
67
68 /* This is where to make the change */
69 location = (u8 *)sechdrs[sechdrs[relsec].sh_info].sh_addr
70 + rel[i].r_offset;
71 loc32 = (u32 *) location;
72
73 #ifdef CONFIG_SPARC64
74 BUG_ON(((u64)location >> (u64)32) != (u64)0);
75 #endif /* CONFIG_SPARC64 */
76
77 /* This is the symbol it is referring to. Note that all
78 undefined symbols have been resolved. */
79 sym = (Elf_Sym *)sechdrs[symindex].sh_addr
80 + ELF_R_SYM(rel[i].r_info);
81 v = sym->st_value + rel[i].r_addend;
82
83 switch (ELF_R_TYPE(rel[i].r_info) & 0xff) {
84 case R_SPARC_DISP32:
85 v -= (Elf_Addr) location;
86 *loc32 = v;
87 break;
88 #ifdef CONFIG_SPARC64
89 case R_SPARC_64:
90 location[0] = v >> 56;
91 location[1] = v >> 48;
92 location[2] = v >> 40;
93 location[3] = v >> 32;
94 location[4] = v >> 24;
95 location[5] = v >> 16;
96 location[6] = v >> 8;
97 location[7] = v >> 0;
98 break;
99
100 case R_SPARC_WDISP19:
101 v -= (Elf_Addr) location;
102 *loc32 = (*loc32 & ~0x7ffff) |
103 ((v >> 2) & 0x7ffff);
104 break;
105
106 case R_SPARC_OLO10:
107 *loc32 = (*loc32 & ~0x1fff) |
108 (((v & 0x3ff) +
109 (ELF_R_TYPE(rel[i].r_info) >> 8))
110 & 0x1fff);
111 break;
112 #endif /* CONFIG_SPARC64 */
113
114 case R_SPARC_32:
115 case R_SPARC_UA32:
116 location[0] = v >> 24;
117 location[1] = v >> 16;
118 location[2] = v >> 8;
119 location[3] = v >> 0;
120 break;
121
122 case R_SPARC_WDISP30:
123 v -= (Elf_Addr) location;
124 *loc32 = (*loc32 & ~0x3fffffff) |
125 ((v >> 2) & 0x3fffffff);
126 break;
127
128 case R_SPARC_WDISP22:
129 v -= (Elf_Addr) location;
130 *loc32 = (*loc32 & ~0x3fffff) |
131 ((v >> 2) & 0x3fffff);
132 break;
133
134 case R_SPARC_LO10:
135 *loc32 = (*loc32 & ~0x3ff) | (v & 0x3ff);
136 break;
137
138 case R_SPARC_HI22:
139 *loc32 = (*loc32 & ~0x3fffff) |
140 ((v >> 10) & 0x3fffff);
141 break;
142
143 default:
144 printk(KERN_ERR "module %s: Unknown relocation: %x\n",
145 me->name,
146 (int) (ELF_R_TYPE(rel[i].r_info) & 0xff));
147 return -ENOEXEC;
148 }
149 }
150 return 0;
151 }
152
153 #ifdef CONFIG_SPARC64
154 static void do_patch_sections(const Elf_Ehdr *hdr,
155 const Elf_Shdr *sechdrs)
156 {
157 const Elf_Shdr *s, *sun4v_1insn = NULL, *sun4v_2insn = NULL;
158 char *secstrings = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
159
160 for (s = sechdrs; s < sechdrs + hdr->e_shnum; s++) {
161 if (!strcmp(".sun4v_1insn_patch", secstrings + s->sh_name))
162 sun4v_1insn = s;
163 if (!strcmp(".sun4v_2insn_patch", secstrings + s->sh_name))
164 sun4v_2insn = s;
165 }
166
167 if (sun4v_1insn && tlb_type == hypervisor) {
168 void *p = (void *) sun4v_1insn->sh_addr;
169 sun4v_patch_1insn_range(p, p + sun4v_1insn->sh_size);
170 }
171 if (sun4v_2insn && tlb_type == hypervisor) {
172 void *p = (void *) sun4v_2insn->sh_addr;
173 sun4v_patch_2insn_range(p, p + sun4v_2insn->sh_size);
174 }
175 }
176
177 int module_finalize(const Elf_Ehdr *hdr,
178 const Elf_Shdr *sechdrs,
179 struct module *me)
180 {
181 do_patch_sections(hdr, sechdrs);
182
183 /* Cheetah's I-cache is fully coherent. */
184 if (tlb_type == spitfire) {
185 unsigned long va;
186
187 flushw_all();
188 for (va = 0; va < (PAGE_SIZE << 1); va += 32)
189 spitfire_put_icache_tag(va, 0x0);
190 __asm__ __volatile__("flush %g6");
191 }
192
193 return 0;
194 }
195 #endif /* CONFIG_SPARC64 */
196
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