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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. */
25int 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 int i;
33
34 for (symidx = 0; sechdrs[symidx].sh_type != SHT_SYMTAB; symidx++) {
35 if (symidx == hdr->e_shnum-1) {
36 printk("%s: no symtab found.\n", mod->name);
37 return -ENOEXEC;
38 }
39 }
40 sym = (Elf_Sym *)sechdrs[symidx].sh_addr;
41
42 for (i = 1; i < sechdrs[symidx].sh_size / sizeof(Elf_Sym); i++) {
43 if (sym[i].st_shndx == SHN_UNDEF) {
44 if (ELF_ST_TYPE(sym[i].st_info) == STT_REGISTER)
45 sym[i].st_shndx = SHN_ABS;
46 }
47 }
48 return 0;
49}
50
51int apply_relocate_add(Elf_Shdr *sechdrs,
52 const char *strtab,
53 unsigned int symindex,
54 unsigned int relsec,
55 struct module *me)
56{
57 unsigned int i;
58 Elf_Rela *rel = (void *)sechdrs[relsec].sh_addr;
59 Elf_Sym *sym;
60 u8 *location;
61 u32 *loc32;
62
63 for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
64 Elf_Addr v;
65
66 /* This is where to make the change */
67 location = (u8 *)sechdrs[sechdrs[relsec].sh_info].sh_addr
68 + rel[i].r_offset;
69 loc32 = (u32 *) location;
70
71#ifdef CONFIG_SPARC64
72 BUG_ON(((u64)location >> (u64)32) != (u64)0);
73#endif /* CONFIG_SPARC64 */
74
75 /* This is the symbol it is referring to. Note that all
76 undefined symbols have been resolved. */
77 sym = (Elf_Sym *)sechdrs[symindex].sh_addr
78 + ELF_R_SYM(rel[i].r_info);
79 v = sym->st_value + rel[i].r_addend;
80
81 switch (ELF_R_TYPE(rel[i].r_info) & 0xff) {
82 case R_SPARC_DISP32:
83 v -= (Elf_Addr) location;
84 *loc32 = v;
85 break;
86#ifdef CONFIG_SPARC64
87 case R_SPARC_64:
88 case R_SPARC_UA64:
89 location[0] = v >> 56;
90 location[1] = v >> 48;
91 location[2] = v >> 40;
92 location[3] = v >> 32;
93 location[4] = v >> 24;
94 location[5] = v >> 16;
95 location[6] = v >> 8;
96 location[7] = v >> 0;
97 break;
98
99 case R_SPARC_WDISP19:
100 v -= (Elf_Addr) location;
101 *loc32 = (*loc32 & ~0x7ffff) |
102 ((v >> 2) & 0x7ffff);
103 break;
104
105 case R_SPARC_OLO10:
106 *loc32 = (*loc32 & ~0x1fff) |
107 (((v & 0x3ff) +
108 (ELF_R_TYPE(rel[i].r_info) >> 8))
109 & 0x1fff);
110 break;
111#endif /* CONFIG_SPARC64 */
112
113 case R_SPARC_32:
114 case R_SPARC_UA32:
115 location[0] = v >> 24;
116 location[1] = v >> 16;
117 location[2] = v >> 8;
118 location[3] = v >> 0;
119 break;
120
121 case R_SPARC_WDISP30:
122 v -= (Elf_Addr) location;
123 *loc32 = (*loc32 & ~0x3fffffff) |
124 ((v >> 2) & 0x3fffffff);
125 break;
126
127 case R_SPARC_WDISP22:
128 v -= (Elf_Addr) location;
129 *loc32 = (*loc32 & ~0x3fffff) |
130 ((v >> 2) & 0x3fffff);
131 break;
132
133 case R_SPARC_LO10:
134 *loc32 = (*loc32 & ~0x3ff) | (v & 0x3ff);
135 break;
136
137 case R_SPARC_HI22:
138 *loc32 = (*loc32 & ~0x3fffff) |
139 ((v >> 10) & 0x3fffff);
140 break;
141
142 default:
143 printk(KERN_ERR "module %s: Unknown relocation: 0x%x\n",
144 me->name,
145 (int) (ELF_R_TYPE(rel[i].r_info) & 0xff));
146 return -ENOEXEC;
147 }
148 }
149 return 0;
150}
151
152#ifdef CONFIG_SPARC64
153static void do_patch_sections(const Elf_Ehdr *hdr,
154 const Elf_Shdr *sechdrs)
155{
156 const Elf_Shdr *s, *sun4v_1insn = NULL, *sun4v_2insn = NULL;
157 char *secstrings = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
158
159 for (s = sechdrs; s < sechdrs + hdr->e_shnum; s++) {
160 if (!strcmp(".sun4v_1insn_patch", secstrings + s->sh_name))
161 sun4v_1insn = s;
162 if (!strcmp(".sun4v_2insn_patch", secstrings + s->sh_name))
163 sun4v_2insn = s;
164 }
165
166 if (sun4v_1insn && tlb_type == hypervisor) {
167 void *p = (void *) sun4v_1insn->sh_addr;
168 sun4v_patch_1insn_range(p, p + sun4v_1insn->sh_size);
169 }
170 if (sun4v_2insn && tlb_type == hypervisor) {
171 void *p = (void *) sun4v_2insn->sh_addr;
172 sun4v_patch_2insn_range(p, p + sun4v_2insn->sh_size);
173 }
174}
175
176int module_finalize(const Elf_Ehdr *hdr,
177 const Elf_Shdr *sechdrs,
178 struct module *me)
179{
180 do_patch_sections(hdr, sechdrs);
181
182 /* Cheetah's I-cache is fully coherent. */
183 if (tlb_type == spitfire) {
184 unsigned long va;
185
186 flushw_all();
187 for (va = 0; va < (PAGE_SIZE << 1); va += 32)
188 spitfire_put_icache_tag(va, 0x0);
189 __asm__ __volatile__("flush %g6");
190 }
191
192 return 0;
193}
194#endif /* CONFIG_SPARC64 */