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 #ifdef CONFIG_SPARC64 25 26 #include <linux/jump_label.h> 27 28 static void *module_map(unsigned long size) 29 { 30 if (PAGE_ALIGN(size) > MODULES_LEN) 31 return NULL; 32 return __vmalloc_node_range(size, 1, MODULES_VADDR, MODULES_END, 33 GFP_KERNEL, PAGE_KERNEL, 0, NUMA_NO_NODE, 34 __builtin_return_address(0)); 35 } 36 #else 37 static void *module_map(unsigned long size) 38 { 39 return vmalloc(size); 40 } 41 #endif /* CONFIG_SPARC64 */ 42 43 void *module_alloc(unsigned long size) 44 { 45 void *ret; 46 47 ret = module_map(size); 48 if (ret) 49 memset(ret, 0, size); 50 51 return ret; 52 } 53 54 /* Make generic code ignore STT_REGISTER dummy undefined symbols. */ 55 int module_frob_arch_sections(Elf_Ehdr *hdr, 56 Elf_Shdr *sechdrs, 57 char *secstrings, 58 struct module *mod) 59 { 60 unsigned int symidx; 61 Elf_Sym *sym; 62 char *strtab; 63 int i; 64 65 for (symidx = 0; sechdrs[symidx].sh_type != SHT_SYMTAB; symidx++) { 66 if (symidx == hdr->e_shnum-1) { 67 printk("%s: no symtab found.\n", mod->name); 68 return -ENOEXEC; 69 } 70 } 71 sym = (Elf_Sym *)sechdrs[symidx].sh_addr; 72 strtab = (char *)sechdrs[sechdrs[symidx].sh_link].sh_addr; 73 74 for (i = 1; i < sechdrs[symidx].sh_size / sizeof(Elf_Sym); i++) { 75 if (sym[i].st_shndx == SHN_UNDEF) { 76 if (ELF_ST_TYPE(sym[i].st_info) == STT_REGISTER) 77 sym[i].st_shndx = SHN_ABS; 78 } 79 } 80 return 0; 81 } 82 83 int apply_relocate_add(Elf_Shdr *sechdrs, 84 const char *strtab, 85 unsigned int symindex, 86 unsigned int relsec, 87 struct module *me) 88 { 89 unsigned int i; 90 Elf_Rela *rel = (void *)sechdrs[relsec].sh_addr; 91 Elf_Sym *sym; 92 u8 *location; 93 u32 *loc32; 94 95 for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) { 96 Elf_Addr v; 97 98 /* This is where to make the change */ 99 location = (u8 *)sechdrs[sechdrs[relsec].sh_info].sh_addr 100 + rel[i].r_offset; 101 loc32 = (u32 *) location; 102 103 #ifdef CONFIG_SPARC64 104 BUG_ON(((u64)location >> (u64)32) != (u64)0); 105 #endif /* CONFIG_SPARC64 */ 106 107 /* This is the symbol it is referring to. Note that all 108 undefined symbols have been resolved. */ 109 sym = (Elf_Sym *)sechdrs[symindex].sh_addr 110 + ELF_R_SYM(rel[i].r_info); 111 v = sym->st_value + rel[i].r_addend; 112 113 switch (ELF_R_TYPE(rel[i].r_info) & 0xff) { 114 case R_SPARC_DISP32: 115 v -= (Elf_Addr) location; 116 *loc32 = v; 117 break; 118 #ifdef CONFIG_SPARC64 119 case R_SPARC_64: 120 location[0] = v >> 56; 121 location[1] = v >> 48; 122 location[2] = v >> 40; 123 location[3] = v >> 32; 124 location[4] = v >> 24; 125 location[5] = v >> 16; 126 location[6] = v >> 8; 127 location[7] = v >> 0; 128 break; 129 130 case R_SPARC_WDISP19: 131 v -= (Elf_Addr) location; 132 *loc32 = (*loc32 & ~0x7ffff) | 133 ((v >> 2) & 0x7ffff); 134 break; 135 136 case R_SPARC_OLO10: 137 *loc32 = (*loc32 & ~0x1fff) | 138 (((v & 0x3ff) + 139 (ELF_R_TYPE(rel[i].r_info) >> 8)) 140 & 0x1fff); 141 break; 142 #endif /* CONFIG_SPARC64 */ 143 144 case R_SPARC_32: 145 case R_SPARC_UA32: 146 location[0] = v >> 24; 147 location[1] = v >> 16; 148 location[2] = v >> 8; 149 location[3] = v >> 0; 150 break; 151 152 case R_SPARC_WDISP30: 153 v -= (Elf_Addr) location; 154 *loc32 = (*loc32 & ~0x3fffffff) | 155 ((v >> 2) & 0x3fffffff); 156 break; 157 158 case R_SPARC_WDISP22: 159 v -= (Elf_Addr) location; 160 *loc32 = (*loc32 & ~0x3fffff) | 161 ((v >> 2) & 0x3fffff); 162 break; 163 164 case R_SPARC_LO10: 165 *loc32 = (*loc32 & ~0x3ff) | (v & 0x3ff); 166 break; 167 168 case R_SPARC_HI22: 169 *loc32 = (*loc32 & ~0x3fffff) | 170 ((v >> 10) & 0x3fffff); 171 break; 172 173 default: 174 printk(KERN_ERR "module %s: Unknown relocation: %x\n", 175 me->name, 176 (int) (ELF_R_TYPE(rel[i].r_info) & 0xff)); 177 return -ENOEXEC; 178 } 179 } 180 return 0; 181 } 182 183 #ifdef CONFIG_SPARC64 184 static void do_patch_sections(const Elf_Ehdr *hdr, 185 const Elf_Shdr *sechdrs) 186 { 187 const Elf_Shdr *s, *sun4v_1insn = NULL, *sun4v_2insn = NULL; 188 char *secstrings = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset; 189 190 for (s = sechdrs; s < sechdrs + hdr->e_shnum; s++) { 191 if (!strcmp(".sun4v_1insn_patch", secstrings + s->sh_name)) 192 sun4v_1insn = s; 193 if (!strcmp(".sun4v_2insn_patch", secstrings + s->sh_name)) 194 sun4v_2insn = s; 195 } 196 197 if (sun4v_1insn && tlb_type == hypervisor) { 198 void *p = (void *) sun4v_1insn->sh_addr; 199 sun4v_patch_1insn_range(p, p + sun4v_1insn->sh_size); 200 } 201 if (sun4v_2insn && tlb_type == hypervisor) { 202 void *p = (void *) sun4v_2insn->sh_addr; 203 sun4v_patch_2insn_range(p, p + sun4v_2insn->sh_size); 204 } 205 } 206 207 int module_finalize(const Elf_Ehdr *hdr, 208 const Elf_Shdr *sechdrs, 209 struct module *me) 210 { 211 do_patch_sections(hdr, sechdrs); 212 213 /* Cheetah's I-cache is fully coherent. */ 214 if (tlb_type == spitfire) { 215 unsigned long va; 216 217 flushw_all(); 218 for (va = 0; va < (PAGE_SIZE << 1); va += 32) 219 spitfire_put_icache_tag(va, 0x0); 220 __asm__ __volatile__("flush %g6"); 221 } 222 223 return 0; 224 } 225 #endif /* CONFIG_SPARC64 */ 226