^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /* Kernel module help for PPC.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) Copyright (C) 2001 Rusty Russell.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/moduleloader.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/elf.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/vmalloc.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/fs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/string.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/ftrace.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/cache.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/bug.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <linux/sort.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <asm/setup.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) /* Count how many different relocations (different symbol, different
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) addend) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) static unsigned int count_relocs(const Elf32_Rela *rela, unsigned int num)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) unsigned int i, r_info, r_addend, _count_relocs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) _count_relocs = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) r_info = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) r_addend = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) for (i = 0; i < num; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) /* Only count 24-bit relocs, others don't need stubs */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) if (ELF32_R_TYPE(rela[i].r_info) == R_PPC_REL24 &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) (r_info != ELF32_R_SYM(rela[i].r_info) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) r_addend != rela[i].r_addend)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) _count_relocs++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) r_info = ELF32_R_SYM(rela[i].r_info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) r_addend = rela[i].r_addend;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) #ifdef CONFIG_DYNAMIC_FTRACE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) _count_relocs++; /* add one for ftrace_caller */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) return _count_relocs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) static int relacmp(const void *_x, const void *_y)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) const Elf32_Rela *x, *y;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) y = (Elf32_Rela *)_x;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) x = (Elf32_Rela *)_y;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) /* Compare the entire r_info (as opposed to ELF32_R_SYM(r_info) only) to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) * make the comparison cheaper/faster. It won't affect the sorting or
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) * the counting algorithms' performance
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) if (x->r_info < y->r_info)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) else if (x->r_info > y->r_info)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) else if (x->r_addend < y->r_addend)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) else if (x->r_addend > y->r_addend)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) /* Get the potential trampolines size required of the init and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) non-init sections */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) static unsigned long get_plt_size(const Elf32_Ehdr *hdr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) const Elf32_Shdr *sechdrs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) const char *secstrings,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) int is_init)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) unsigned long ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) unsigned i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) /* Everything marked ALLOC (this includes the exported
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) symbols) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) for (i = 1; i < hdr->e_shnum; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) /* If it's called *.init*, and we're not init, we're
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) not interested */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) if ((strstr(secstrings + sechdrs[i].sh_name, ".init") != NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) != is_init)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) /* We don't want to look at debug sections. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) if (strstr(secstrings + sechdrs[i].sh_name, ".debug"))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) if (sechdrs[i].sh_type == SHT_RELA) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) pr_debug("Found relocations in section %u\n", i);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) pr_debug("Ptr: %p. Number: %u\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) (void *)hdr + sechdrs[i].sh_offset,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) sechdrs[i].sh_size / sizeof(Elf32_Rela));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) /* Sort the relocation information based on a symbol and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) * addend key. This is a stable O(n*log n) complexity
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) * alogrithm but it will reduce the complexity of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) * count_relocs() to linear complexity O(n)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) sort((void *)hdr + sechdrs[i].sh_offset,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) sechdrs[i].sh_size / sizeof(Elf32_Rela),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) sizeof(Elf32_Rela), relacmp, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) ret += count_relocs((void *)hdr
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) + sechdrs[i].sh_offset,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) sechdrs[i].sh_size
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) / sizeof(Elf32_Rela))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) * sizeof(struct ppc_plt_entry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) int module_frob_arch_sections(Elf32_Ehdr *hdr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) Elf32_Shdr *sechdrs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) char *secstrings,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) struct module *me)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) unsigned int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) /* Find .plt and .init.plt sections */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) for (i = 0; i < hdr->e_shnum; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) if (strcmp(secstrings + sechdrs[i].sh_name, ".init.plt") == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) me->arch.init_plt_section = i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) else if (strcmp(secstrings + sechdrs[i].sh_name, ".plt") == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) me->arch.core_plt_section = i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) if (!me->arch.core_plt_section || !me->arch.init_plt_section) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) pr_err("Module doesn't contain .plt or .init.plt sections.\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) return -ENOEXEC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) /* Override their sizes */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) sechdrs[me->arch.core_plt_section].sh_size
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) = get_plt_size(hdr, sechdrs, secstrings, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) sechdrs[me->arch.init_plt_section].sh_size
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) = get_plt_size(hdr, sechdrs, secstrings, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) static inline int entry_matches(struct ppc_plt_entry *entry, Elf32_Addr val)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) if (entry->jump[0] != (PPC_INST_ADDIS | __PPC_RT(R12) | PPC_HA(val)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) if (entry->jump[1] != (PPC_INST_ADDI | __PPC_RT(R12) | __PPC_RA(R12) |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) PPC_LO(val)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) /* Set up a trampoline in the PLT to bounce us to the distant function */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) static uint32_t do_plt_call(void *location,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) Elf32_Addr val,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) const Elf32_Shdr *sechdrs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) struct module *mod)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) struct ppc_plt_entry *entry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) pr_debug("Doing plt for call to 0x%x at 0x%x\n", val, (unsigned int)location);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) /* Init, or core PLT? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) if (location >= mod->core_layout.base
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) && location < mod->core_layout.base + mod->core_layout.size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) entry = (void *)sechdrs[mod->arch.core_plt_section].sh_addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) entry = (void *)sechdrs[mod->arch.init_plt_section].sh_addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) /* Find this entry, or if that fails, the next avail. entry */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) while (entry->jump[0]) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) if (entry_matches(entry, val)) return (uint32_t)entry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) entry++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) * lis r12, sym@ha
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) * addi r12, r12, sym@l
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) * mtctr r12
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) * bctr
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) entry->jump[0] = PPC_INST_ADDIS | __PPC_RT(R12) | PPC_HA(val);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) entry->jump[1] = PPC_INST_ADDI | __PPC_RT(R12) | __PPC_RA(R12) | PPC_LO(val);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) entry->jump[2] = PPC_INST_MTCTR | __PPC_RS(R12);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) entry->jump[3] = PPC_INST_BCTR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) pr_debug("Initialized plt for 0x%x at %p\n", val, entry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) return (uint32_t)entry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) int apply_relocate_add(Elf32_Shdr *sechdrs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) const char *strtab,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) unsigned int symindex,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) unsigned int relsec,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) struct module *module)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) unsigned int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) Elf32_Rela *rela = (void *)sechdrs[relsec].sh_addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) Elf32_Sym *sym;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) uint32_t *location;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) uint32_t value;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) pr_debug("Applying ADD relocate section %u to %u\n", relsec,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) sechdrs[relsec].sh_info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rela); i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) /* This is where to make the change */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) + rela[i].r_offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) /* This is the symbol it is referring to. Note that all
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) undefined symbols have been resolved. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) sym = (Elf32_Sym *)sechdrs[symindex].sh_addr
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) + ELF32_R_SYM(rela[i].r_info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) /* `Everything is relative'. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) value = sym->st_value + rela[i].r_addend;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) switch (ELF32_R_TYPE(rela[i].r_info)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) case R_PPC_ADDR32:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) /* Simply set it */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) *(uint32_t *)location = value;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) case R_PPC_ADDR16_LO:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) /* Low half of the symbol */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) *(uint16_t *)location = value;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) case R_PPC_ADDR16_HI:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) /* Higher half of the symbol */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) *(uint16_t *)location = (value >> 16);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) case R_PPC_ADDR16_HA:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) /* Sign-adjusted lower 16 bits: PPC ELF ABI says:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) (((x >> 16) + ((x & 0x8000) ? 1 : 0))) & 0xFFFF.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) This is the same, only sane.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) *(uint16_t *)location = (value + 0x8000) >> 16;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) case R_PPC_REL24:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) if ((int)(value - (uint32_t)location) < -0x02000000
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) || (int)(value - (uint32_t)location) >= 0x02000000)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) value = do_plt_call(location, value,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) sechdrs, module);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) /* Only replace bits 2 through 26 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) pr_debug("REL24 value = %08X. location = %08X\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) value, (uint32_t)location);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) pr_debug("Location before: %08X.\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) *(uint32_t *)location);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) *(uint32_t *)location
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) = (*(uint32_t *)location & ~0x03fffffc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) | ((value - (uint32_t)location)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) & 0x03fffffc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) pr_debug("Location after: %08X.\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) *(uint32_t *)location);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) pr_debug("ie. jump to %08X+%08X = %08X\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) *(uint32_t *)location & 0x03fffffc,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) (uint32_t)location,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) (*(uint32_t *)location & 0x03fffffc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) + (uint32_t)location);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) case R_PPC_REL32:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) /* 32-bit relative jump. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) *(uint32_t *)location = value - (uint32_t)location;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) pr_err("%s: unknown ADD relocation: %u\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) module->name,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) ELF32_R_TYPE(rela[i].r_info));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) return -ENOEXEC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) #ifdef CONFIG_DYNAMIC_FTRACE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) int module_finalize_ftrace(struct module *module, const Elf_Shdr *sechdrs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) module->arch.tramp = do_plt_call(module->core_layout.base,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) (unsigned long)ftrace_caller,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) sechdrs, module);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) if (!module->arch.tramp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) return -ENOENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) #endif
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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