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