diff options
Diffstat (limited to 'arch/ia64/kernel/module.c')
| -rw-r--r-- | arch/ia64/kernel/module.c | 959 |
1 files changed, 0 insertions, 959 deletions
diff --git a/arch/ia64/kernel/module.c b/arch/ia64/kernel/module.c deleted file mode 100644 index 3661135da9..0000000000 --- a/arch/ia64/kernel/module.c +++ /dev/null @@ -1,959 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 -/* - * IA-64-specific support for kernel module loader. - * - * Copyright (C) 2003 Hewlett-Packard Co - * David Mosberger-Tang <davidm@hpl.hp.com> - * - * Loosely based on patch by Rusty Russell. - */ - -/* relocs tested so far: - - DIR64LSB - FPTR64LSB - GPREL22 - LDXMOV - LDXMOV - LTOFF22 - LTOFF22X - LTOFF22X - LTOFF_FPTR22 - PCREL21B (for br.call only; br.cond is not supported out of modules!) - PCREL60B (for brl.cond only; brl.call is not supported for modules!) - PCREL64LSB - SECREL32LSB - SEGREL64LSB - */ - - -#include <linux/kernel.h> -#include <linux/sched.h> -#include <linux/elf.h> -#include <linux/moduleloader.h> -#include <linux/string.h> -#include <linux/vmalloc.h> - -#include <asm/patch.h> -#include <asm/unaligned.h> -#include <asm/sections.h> - -#define ARCH_MODULE_DEBUG 0 - -#if ARCH_MODULE_DEBUG -# define DEBUGP printk -# define inline -#else -# define DEBUGP(fmt , a...) -#endif - -#ifdef CONFIG_ITANIUM -# define USE_BRL 0 -#else -# define USE_BRL 1 -#endif - -#define MAX_LTOFF ((uint64_t) (1 << 22)) /* max. allowable linkage-table offset */ - -/* Define some relocation helper macros/types: */ - -#define FORMAT_SHIFT 0 -#define FORMAT_BITS 3 -#define FORMAT_MASK ((1 << FORMAT_BITS) - 1) -#define VALUE_SHIFT 3 -#define VALUE_BITS 5 -#define VALUE_MASK ((1 << VALUE_BITS) - 1) - -enum reloc_target_format { - /* direct encoded formats: */ - RF_NONE = 0, - RF_INSN14 = 1, - RF_INSN22 = 2, - RF_INSN64 = 3, - RF_32MSB = 4, - RF_32LSB = 5, - RF_64MSB = 6, - RF_64LSB = 7, - - /* formats that cannot be directly decoded: */ - RF_INSN60, - RF_INSN21B, /* imm21 form 1 */ - RF_INSN21M, /* imm21 form 2 */ - RF_INSN21F /* imm21 form 3 */ -}; - -enum reloc_value_formula { - RV_DIRECT = 4, /* S + A */ - RV_GPREL = 5, /* @gprel(S + A) */ - RV_LTREL = 6, /* @ltoff(S + A) */ - RV_PLTREL = 7, /* @pltoff(S + A) */ - RV_FPTR = 8, /* @fptr(S + A) */ - RV_PCREL = 9, /* S + A - P */ - RV_LTREL_FPTR = 10, /* @ltoff(@fptr(S + A)) */ - RV_SEGREL = 11, /* @segrel(S + A) */ - RV_SECREL = 12, /* @secrel(S + A) */ - RV_BDREL = 13, /* BD + A */ - RV_LTV = 14, /* S + A (like RV_DIRECT, except frozen at static link-time) */ - RV_PCREL2 = 15, /* S + A - P */ - RV_SPECIAL = 16, /* various (see below) */ - RV_RSVD17 = 17, - RV_TPREL = 18, /* @tprel(S + A) */ - RV_LTREL_TPREL = 19, /* @ltoff(@tprel(S + A)) */ - RV_DTPMOD = 20, /* @dtpmod(S + A) */ - RV_LTREL_DTPMOD = 21, /* @ltoff(@dtpmod(S + A)) */ - RV_DTPREL = 22, /* @dtprel(S + A) */ - RV_LTREL_DTPREL = 23, /* @ltoff(@dtprel(S + A)) */ - RV_RSVD24 = 24, - RV_RSVD25 = 25, - RV_RSVD26 = 26, - RV_RSVD27 = 27 - /* 28-31 reserved for implementation-specific purposes. */ -}; - -#define N(reloc) [R_IA64_##reloc] = #reloc - -static const char *reloc_name[256] = { - N(NONE), N(IMM14), N(IMM22), N(IMM64), - N(DIR32MSB), N(DIR32LSB), N(DIR64MSB), N(DIR64LSB), - N(GPREL22), N(GPREL64I), N(GPREL32MSB), N(GPREL32LSB), - N(GPREL64MSB), N(GPREL64LSB), N(LTOFF22), N(LTOFF64I), - N(PLTOFF22), N(PLTOFF64I), N(PLTOFF64MSB), N(PLTOFF64LSB), - N(FPTR64I), N(FPTR32MSB), N(FPTR32LSB), N(FPTR64MSB), - N(FPTR64LSB), N(PCREL60B), N(PCREL21B), N(PCREL21M), - N(PCREL21F), N(PCREL32MSB), N(PCREL32LSB), N(PCREL64MSB), - N(PCREL64LSB), N(LTOFF_FPTR22), N(LTOFF_FPTR64I), N(LTOFF_FPTR32MSB), - N(LTOFF_FPTR32LSB), N(LTOFF_FPTR64MSB), N(LTOFF_FPTR64LSB), N(SEGREL32MSB), - N(SEGREL32LSB), N(SEGREL64MSB), N(SEGREL64LSB), N(SECREL32MSB), - N(SECREL32LSB), N(SECREL64MSB), N(SECREL64LSB), N(REL32MSB), - N(REL32LSB), N(REL64MSB), N(REL64LSB), N(LTV32MSB), - N(LTV32LSB), N(LTV64MSB), N(LTV64LSB), N(PCREL21BI), - N(PCREL22), N(PCREL64I), N(IPLTMSB), N(IPLTLSB), - N(COPY), N(LTOFF22X), N(LDXMOV), N(TPREL14), - N(TPREL22), N(TPREL64I), N(TPREL64MSB), N(TPREL64LSB), - N(LTOFF_TPREL22), N(DTPMOD64MSB), N(DTPMOD64LSB), N(LTOFF_DTPMOD22), - N(DTPREL14), N(DTPREL22), N(DTPREL64I), N(DTPREL32MSB), - N(DTPREL32LSB), N(DTPREL64MSB), N(DTPREL64LSB), N(LTOFF_DTPREL22) -}; - -#undef N - -/* Opaque struct for insns, to protect against derefs. */ -struct insn; - -static inline uint64_t -bundle (const struct insn *insn) -{ - return (uint64_t) insn & ~0xfUL; -} - -static inline int -slot (const struct insn *insn) -{ - return (uint64_t) insn & 0x3; -} - -static int -apply_imm64 (struct module *mod, struct insn *insn, uint64_t val) -{ - if (slot(insn) != 1 && slot(insn) != 2) { - printk(KERN_ERR "%s: invalid slot number %d for IMM64\n", - mod->name, slot(insn)); - return 0; - } - ia64_patch_imm64((u64) insn, val); - return 1; -} - -static int -apply_imm60 (struct module *mod, struct insn *insn, uint64_t val) -{ - if (slot(insn) != 1 && slot(insn) != 2) { - printk(KERN_ERR "%s: invalid slot number %d for IMM60\n", - mod->name, slot(insn)); - return 0; - } - if (val + ((uint64_t) 1 << 59) >= (1UL << 60)) { - printk(KERN_ERR "%s: value %ld out of IMM60 range\n", - mod->name, (long) val); - return 0; - } - ia64_patch_imm60((u64) insn, val); - return 1; -} - -static int -apply_imm22 (struct module *mod, struct insn *insn, uint64_t val) -{ - if (val + (1 << 21) >= (1 << 22)) { - printk(KERN_ERR "%s: value %li out of IMM22 range\n", - mod->name, (long)val); - return 0; - } - ia64_patch((u64) insn, 0x01fffcfe000UL, ( ((val & 0x200000UL) << 15) /* bit 21 -> 36 */ - | ((val & 0x1f0000UL) << 6) /* bit 16 -> 22 */ - | ((val & 0x00ff80UL) << 20) /* bit 7 -> 27 */ - | ((val & 0x00007fUL) << 13) /* bit 0 -> 13 */)); - return 1; -} - -static int -apply_imm21b (struct module *mod, struct insn *insn, uint64_t val) -{ - if (val + (1 << 20) >= (1 << 21)) { - printk(KERN_ERR "%s: value %li out of IMM21b range\n", - mod->name, (long)val); - return 0; - } - ia64_patch((u64) insn, 0x11ffffe000UL, ( ((val & 0x100000UL) << 16) /* bit 20 -> 36 */ - | ((val & 0x0fffffUL) << 13) /* bit 0 -> 13 */)); - return 1; -} - -#if USE_BRL - -struct plt_entry { - /* Three instruction bundles in PLT. */ - unsigned char bundle[2][16]; -}; - -static const struct plt_entry ia64_plt_template = { - { - { - 0x04, 0x00, 0x00, 0x00, 0x01, 0x00, /* [MLX] nop.m 0 */ - 0x00, 0x00, 0x00, 0x00, 0x00, 0x20, /* movl gp=TARGET_GP */ - 0x00, 0x00, 0x00, 0x60 - }, - { - 0x05, 0x00, 0x00, 0x00, 0x01, 0x00, /* [MLX] nop.m 0 */ - 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* brl.many gp=TARGET_GP */ - 0x08, 0x00, 0x00, 0xc0 - } - } -}; - -static int -patch_plt (struct module *mod, struct plt_entry *plt, long target_ip, unsigned long target_gp) -{ - if (apply_imm64(mod, (struct insn *) (plt->bundle[0] + 2), target_gp) - && apply_imm60(mod, (struct insn *) (plt->bundle[1] + 2), - (target_ip - (int64_t) plt->bundle[1]) / 16)) - return 1; - return 0; -} - -unsigned long -plt_target (struct plt_entry *plt) -{ - uint64_t b0, b1, *b = (uint64_t *) plt->bundle[1]; - long off; - - b0 = b[0]; b1 = b[1]; - off = ( ((b1 & 0x00fffff000000000UL) >> 36) /* imm20b -> bit 0 */ - | ((b0 >> 48) << 20) | ((b1 & 0x7fffffUL) << 36) /* imm39 -> bit 20 */ - | ((b1 & 0x0800000000000000UL) << 0)); /* i -> bit 59 */ - return (long) plt->bundle[1] + 16*off; -} - -#else /* !USE_BRL */ - -struct plt_entry { - /* Three instruction bundles in PLT. */ - unsigned char bundle[3][16]; -}; - -static const struct plt_entry ia64_plt_template = { - { - { - 0x05, 0x00, 0x00, 0x00, 0x01, 0x00, /* [MLX] nop.m 0 */ - 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* movl r16=TARGET_IP */ - 0x02, 0x00, 0x00, 0x60 - }, - { - 0x04, 0x00, 0x00, 0x00, 0x01, 0x00, /* [MLX] nop.m 0 */ - 0x00, 0x00, 0x00, 0x00, 0x00, 0x20, /* movl gp=TARGET_GP */ - 0x00, 0x00, 0x00, 0x60 - }, - { - 0x11, 0x00, 0x00, 0x00, 0x01, 0x00, /* [MIB] nop.m 0 */ - 0x60, 0x80, 0x04, 0x80, 0x03, 0x00, /* mov b6=r16 */ - 0x60, 0x00, 0x80, 0x00 /* br.few b6 */ - } - } -}; - -static int -patch_plt (struct module *mod, struct plt_entry *plt, long target_ip, unsigned long target_gp) -{ - if (apply_imm64(mod, (struct insn *) (plt->bundle[0] + 2), target_ip) - && apply_imm64(mod, (struct insn *) (plt->bundle[1] + 2), target_gp)) - return 1; - return 0; -} - -unsigned long -plt_target (struct plt_entry *plt) -{ - uint64_t b0, b1, *b = (uint64_t *) plt->bundle[0]; - - b0 = b[0]; b1 = b[1]; - return ( ((b1 & 0x000007f000000000) >> 36) /* imm7b -> bit 0 */ - | ((b1 & 0x07fc000000000000) >> 43) /* imm9d -> bit 7 */ - | ((b1 & 0x0003e00000000000) >> 29) /* imm5c -> bit 16 */ - | ((b1 & 0x0000100000000000) >> 23) /* ic -> bit 21 */ - | ((b0 >> 46) << 22) | ((b1 & 0x7fffff) << 40) /* imm41 -> bit 22 */ - | ((b1 & 0x0800000000000000) << 4)); /* i -> bit 63 */ -} - -#endif /* !USE_BRL */ - -void -module_arch_freeing_init (struct module *mod) -{ - if (mod->arch.init_unw_table) { - unw_remove_unwind_table(mod->arch.init_unw_table); - mod->arch.init_unw_table = NULL; - } -} - -/* Have we already seen one of these relocations? */ -/* FIXME: we could look in other sections, too --RR */ -static int -duplicate_reloc (const Elf64_Rela *rela, unsigned int num) -{ - unsigned int i; - - for (i = 0; i < num; i++) { - if (rela[i].r_info == rela[num].r_info && rela[i].r_addend == rela[num].r_addend) - return 1; - } - return 0; -} - -/* Count how many GOT entries we may need */ -static unsigned int -count_gots (const Elf64_Rela *rela, unsigned int num) -{ - unsigned int i, ret = 0; - - /* Sure, this is order(n^2), but it's usually short, and not - time critical */ - for (i = 0; i < num; i++) { - switch (ELF64_R_TYPE(rela[i].r_info)) { - case R_IA64_LTOFF22: - case R_IA64_LTOFF22X: - case R_IA64_LTOFF64I: - case R_IA64_LTOFF_FPTR22: - case R_IA64_LTOFF_FPTR64I: - case R_IA64_LTOFF_FPTR32MSB: - case R_IA64_LTOFF_FPTR32LSB: - case R_IA64_LTOFF_FPTR64MSB: - case R_IA64_LTOFF_FPTR64LSB: - if (!duplicate_reloc(rela, i)) - ret++; - break; - } - } - return ret; -} - -/* Count how many PLT entries we may need */ -static unsigned int -count_plts (const Elf64_Rela *rela, unsigned int num) -{ - unsigned int i, ret = 0; - - /* Sure, this is order(n^2), but it's usually short, and not - time critical */ - for (i = 0; i < num; i++) { - switch (ELF64_R_TYPE(rela[i].r_info)) { - case R_IA64_PCREL21B: - case R_IA64_PLTOFF22: - case R_IA64_PLTOFF64I: - case R_IA64_PLTOFF64MSB: - case R_IA64_PLTOFF64LSB: - case R_IA64_IPLTMSB: - case R_IA64_IPLTLSB: - if (!duplicate_reloc(rela, i)) - ret++; - break; - } - } - return ret; -} - -/* We need to create an function-descriptors for any internal function - which is referenced. */ -static unsigned int -count_fdescs (const Elf64_Rela *rela, unsigned int num) -{ - unsigned int i, ret = 0; - - /* Sure, this is order(n^2), but it's usually short, and not time critical. */ - for (i = 0; i < num; i++) { - switch (ELF64_R_TYPE(rela[i].r_info)) { - case R_IA64_FPTR64I: - case R_IA64_FPTR32LSB: - case R_IA64_FPTR32MSB: - case R_IA64_FPTR64LSB: - case R_IA64_FPTR64MSB: - case R_IA64_LTOFF_FPTR22: - case R_IA64_LTOFF_FPTR32LSB: - case R_IA64_LTOFF_FPTR32MSB: - case R_IA64_LTOFF_FPTR64I: - case R_IA64_LTOFF_FPTR64LSB: - case R_IA64_LTOFF_FPTR64MSB: - case R_IA64_IPLTMSB: - case R_IA64_IPLTLSB: - /* - * Jumps to static functions sometimes go straight to their - * offset. Of course, that may not be possible if the jump is - * from init -> core or vice. versa, so we need to generate an - * FDESC (and PLT etc) for that. - */ - case R_IA64_PCREL21B: - if (!duplicate_reloc(rela, i)) - ret++; - break; - } - } - return ret; -} - -int -module_frob_arch_sections (Elf_Ehdr *ehdr, Elf_Shdr *sechdrs, char *secstrings, - struct module *mod) -{ - unsigned long core_plts = 0, init_plts = 0, gots = 0, fdescs = 0; - Elf64_Shdr *s, *sechdrs_end = sechdrs + ehdr->e_shnum; - - /* - * To store the PLTs and function-descriptors, we expand the .text section for - * core module-code and the .init.text section for initialization code. - */ - for (s = sechdrs; s < sechdrs_end; ++s) - if (strcmp(".core.plt", secstrings + s->sh_name) == 0) - mod->arch.core_plt = s; - else if (strcmp(".init.plt", secstrings + s->sh_name) == 0) - mod->arch.init_plt = s; - else if (strcmp(".got", secstrings + s->sh_name) == 0) - mod->arch.got = s; - else if (strcmp(".opd", secstrings + s->sh_name) == 0) - mod->arch.opd = s; - else if (strcmp(".IA_64.unwind", secstrings + s->sh_name) == 0) - mod->arch.unwind = s; - - if (!mod->arch.core_plt || !mod->arch.init_plt || !mod->arch.got || !mod->arch.opd) { - printk(KERN_ERR "%s: sections missing\n", mod->name); - return -ENOEXEC; - } - - /* GOT and PLTs can occur in any relocated section... */ - for (s = sechdrs + 1; s < sechdrs_end; ++s) { - const Elf64_Rela *rels = (void *)ehdr + s->sh_offset; - unsigned long numrels = s->sh_size/sizeof(Elf64_Rela); - - if (s->sh_type != SHT_RELA) - continue; - - gots += count_gots(rels, numrels); - fdescs += count_fdescs(rels, numrels); - if (strstr(secstrings + s->sh_name, ".init")) - init_plts += count_plts(rels, numrels); - else - core_plts += count_plts(rels, numrels); - } - - mod->arch.core_plt->sh_type = SHT_NOBITS; - mod->arch.core_plt->sh_flags = SHF_EXECINSTR | SHF_ALLOC; - mod->arch.core_plt->sh_addralign = 16; - mod->arch.core_plt->sh_size = core_plts * sizeof(struct plt_entry); - mod->arch.init_plt->sh_type = SHT_NOBITS; - mod->arch.init_plt->sh_flags = SHF_EXECINSTR | SHF_ALLOC; - mod->arch.init_plt->sh_addralign = 16; - mod->arch.init_plt->sh_size = init_plts * sizeof(struct plt_entry); - mod->arch.got->sh_type = SHT_NOBITS; - mod->arch.got->sh_flags = ARCH_SHF_SMALL | SHF_ALLOC; - mod->arch.got->sh_addralign = 8; - mod->arch.got->sh_size = gots * sizeof(struct got_entry); - mod->arch.opd->sh_type = SHT_NOBITS; - mod->arch.opd->sh_flags = SHF_ALLOC; - mod->arch.opd->sh_addralign = 8; - mod->arch.opd->sh_size = fdescs * sizeof(struct fdesc); - DEBUGP("%s: core.plt=%lx, init.plt=%lx, got=%lx, fdesc=%lx\n", - __func__, mod->arch.core_plt->sh_size, mod->arch.init_plt->sh_size, - mod->arch.got->sh_size, mod->arch.opd->sh_size); - return 0; -} - -static inline bool -in_init (const struct module *mod, uint64_t addr) -{ - return within_module_init(addr, mod); -} - -static inline bool -in_core (const struct module *mod, uint64_t addr) -{ - return within_module_core(addr, mod); -} - -static inline bool -is_internal (const struct module *mod, uint64_t value) -{ - return in_init(mod, value) || in_core(mod, value); -} - -/* - * Get gp-relative offset for the linkage-table entry of VALUE. - */ -static uint64_t -get_ltoff (struct module *mod, uint64_t value, int *okp) -{ - struct got_entry *got, *e; - - if (!*okp) - return 0; - - got = (void *) mod->arch.got->sh_addr; - for (e = got; e < got + mod->arch.next_got_entry; ++e) - if (e->val == value) - goto found; - - /* Not enough GOT entries? */ - BUG_ON(e >= (struct got_entry *) (mod->arch.got->sh_addr + mod->arch.got->sh_size)); - - e->val = value; - ++mod->arch.next_got_entry; - found: - return (uint64_t) e - mod->arch.gp; -} - -static inline int -gp_addressable (struct module *mod, uint64_t value) -{ - return value - mod->arch.gp + MAX_LTOFF/2 < MAX_LTOFF; -} - -/* Get PC-relative PLT entry for this value. Returns 0 on failure. */ -static uint64_t -get_plt (struct module *mod, const struct insn *insn, uint64_t value, int *okp) -{ - struct plt_entry *plt, *plt_end; - uint64_t target_ip, target_gp; - - if (!*okp) - return 0; - - if (in_init(mod, (uint64_t) insn)) { - plt = (void *) mod->arch.init_plt->sh_addr; - plt_end = (void *) plt + mod->arch.init_plt->sh_size; - } else { - plt = (void *) mod->arch.core_plt->sh_addr; - plt_end = (void *) plt + mod->arch.core_plt->sh_size; - } - - /* "value" is a pointer to a function-descriptor; fetch the target ip/gp from it: */ - target_ip = ((uint64_t *) value)[0]; - target_gp = ((uint64_t *) value)[1]; - - /* Look for existing PLT entry. */ - while (plt->bundle[0][0]) { - if (plt_target(plt) == target_ip) - goto found; - if (++plt >= plt_end) - BUG(); - } - *plt = ia64_plt_template; - if (!patch_plt(mod, plt, target_ip, target_gp)) { - *okp = 0; - return 0; - } -#if ARCH_MODULE_DEBUG - if (plt_target(plt) != target_ip) { - printk("%s: mistargeted PLT: wanted %lx, got %lx\n", - __func__, target_ip, plt_target(plt)); - *okp = 0; - return 0; - } -#endif - found: - return (uint64_t) plt; -} - -/* Get function descriptor for VALUE. */ -static uint64_t -get_fdesc (struct module *mod, uint64_t value, int *okp) -{ - struct fdesc *fdesc = (void *) mod->arch.opd->sh_addr; - - if (!*okp) - return 0; - - if (!value) { - printk(KERN_ERR "%s: fdesc for zero requested!\n", mod->name); - return 0; - } - - if (!is_internal(mod, value)) - /* - * If it's not a module-local entry-point, "value" already points to a - * function-descriptor. - */ - return value; - - /* Look for existing function descriptor. */ - while (fdesc->addr) { - if (fdesc->addr == value) - return (uint64_t)fdesc; - if ((uint64_t) ++fdesc >= mod->arch.opd->sh_addr + mod->arch.opd->sh_size) - BUG(); - } - - /* Create new one */ - fdesc->addr = value; - fdesc->gp = mod->arch.gp; - return (uint64_t) fdesc; -} - -static inline int -do_reloc (struct module *mod, uint8_t r_type, Elf64_Sym *sym, uint64_t addend, - Elf64_Shdr *sec, void *location) -{ - enum reloc_target_format format = (r_type >> FORMAT_SHIFT) & FORMAT_MASK; - enum reloc_value_formula formula = (r_type >> VALUE_SHIFT) & VALUE_MASK; - uint64_t val; - int ok = 1; - - val = sym->st_value + addend; - - switch (formula) { - case RV_SEGREL: /* segment base is arbitrarily chosen to be 0 for kernel modules */ - case RV_DIRECT: - break; - - case RV_GPREL: val -= mod->arch.gp; break; - case RV_LTREL: val = get_ltoff(mod, val, &ok); break; - case RV_PLTREL: val = get_plt(mod, location, val, &ok); break; - case RV_FPTR: val = get_fdesc(mod, val, &ok); break; - case RV_SECREL: val -= sec->sh_addr; break; - case RV_LTREL_FPTR: val = get_ltoff(mod, get_fdesc(mod, val, &ok), &ok); break; - - case RV_PCREL: - switch (r_type) { - case R_IA64_PCREL21B: - if ((in_init(mod, val) && in_core(mod, (uint64_t)location)) || - (in_core(mod, val) && in_init(mod, (uint64_t)location))) { - /* - * Init section may have been allocated far away from core, - * if the branch won't reach, then allocate a plt for it. - */ - uint64_t delta = ((int64_t)val - (int64_t)location) / 16; - if (delta + (1 << 20) >= (1 << 21)) { - val = get_fdesc(mod, val, &ok); - val = get_plt(mod, location, val, &ok); - } - } else if (!is_internal(mod, val)) - val = get_plt(mod, location, val, &ok); - fallthrough; - default: - val -= bundle(location); - break; - - case R_IA64_PCREL32MSB: - case R_IA64_PCREL32LSB: - case R_IA64_PCREL64MSB: - case R_IA64_PCREL64LSB: - val -= (uint64_t) location; - break; - - } - switch (r_type) { - case R_IA64_PCREL60B: format = RF_INSN60; break; - case R_IA64_PCREL21B: format = RF_INSN21B; break; - case R_IA64_PCREL21M: format = RF_INSN21M; break; - case R_IA64_PCREL21F: format = RF_INSN21F; break; - default: break; - } - break; - - case RV_BDREL: - val -= (uint64_t) (in_init(mod, val) ? mod->mem[MOD_INIT_TEXT].base : - mod->mem[MOD_TEXT].base); - break; - - case RV_LTV: - /* can link-time value relocs happen here? */ - BUG(); - break; - - case RV_PCREL2: - if (r_type == R_IA64_PCREL21BI) { - if (!is_internal(mod, val)) { - printk(KERN_ERR "%s: %s reloc against " - "non-local symbol (%lx)\n", __func__, - reloc_name[r_type], (unsigned long)val); - return -ENOEXEC; - } - format = RF_INSN21B; - } - val -= bundle(location); - break; - - case RV_SPECIAL: - switch (r_type) { - case R_IA64_IPLTMSB: - case R_IA64_IPLTLSB: - val = get_fdesc(mod, get_plt(mod, location, val, &ok), &ok); - format = RF_64LSB; - if (r_type == R_IA64_IPLTMSB) - format = RF_64MSB; - break; - - case R_IA64_SUB: - val = addend - sym->st_value; - format = RF_INSN64; - break; - - case R_IA64_LTOFF22X: - if (gp_addressable(mod, val)) - val -= mod->arch.gp; - else - val = get_ltoff(mod, val, &ok); - format = RF_INSN22; - break; - - case R_IA64_LDXMOV: - if (gp_addressable(mod, val)) { - /* turn "ld8" into "mov": */ - DEBUGP("%s: patching ld8 at %p to mov\n", __func__, location); - ia64_patch((u64) location, 0x1fff80fe000UL, 0x10000000000UL); - } - return 0; - - default: - if (reloc_name[r_type]) - printk(KERN_ERR "%s: special reloc %s not supported", - mod->name, reloc_name[r_type]); - else - printk(KERN_ERR "%s: unknown special reloc %x\n", - mod->name, r_type); - return -ENOEXEC; - } - break; - - case RV_TPREL: - case RV_LTREL_TPREL: - case RV_DTPMOD: - case RV_LTREL_DTPMOD: - case RV_DTPREL: - case RV_LTREL_DTPREL: - printk(KERN_ERR "%s: %s reloc not supported\n", - mod->name, reloc_name[r_type] ? reloc_name[r_type] : "?"); - return -ENOEXEC; - - default: - printk(KERN_ERR "%s: unknown reloc %x\n", mod->name, r_type); - return -ENOEXEC; - } - - if (!ok) - return -ENOEXEC; - - DEBUGP("%s: [%p]<-%016lx = %s(%lx)\n", __func__, location, val, - reloc_name[r_type] ? reloc_name[r_type] : "?", sym->st_value + addend); - - switch (format) { - case RF_INSN21B: ok = apply_imm21b(mod, location, (int64_t) val / 16); break; - case RF_INSN22: ok = apply_imm22(mod, location, val); break; - case RF_INSN64: ok = apply_imm64(mod, location, val); break; - case RF_INSN60: ok = apply_imm60(mod, location, (int64_t) val / 16); break; - case RF_32LSB: put_unaligned(val, (uint32_t *) location); break; - case RF_64LSB: put_unaligned(val, (uint64_t *) location); break; - case RF_32MSB: /* ia64 Linux is little-endian... */ - case RF_64MSB: /* ia64 Linux is little-endian... */ - case RF_INSN14: /* must be within-module, i.e., resolved by "ld -r" */ - case RF_INSN21M: /* must be within-module, i.e., resolved by "ld -r" */ - case RF_INSN21F: /* must be within-module, i.e., resolved by "ld -r" */ - printk(KERN_ERR "%s: format %u needed by %s reloc is not supported\n", - mod->name, format, reloc_name[r_type] ? reloc_name[r_type] : "?"); - return -ENOEXEC; - - default: - printk(KERN_ERR "%s: relocation %s resulted in unknown format %u\n", - mod->name, reloc_name[r_type] ? reloc_name[r_type] : "?", format); - return -ENOEXEC; - } - return ok ? 0 : -ENOEXEC; -} - -int -apply_relocate_add (Elf64_Shdr *sechdrs, const char *strtab, unsigned int symindex, - unsigned int relsec, struct module *mod) -{ - unsigned int i, n = sechdrs[relsec].sh_size / sizeof(Elf64_Rela); - Elf64_Rela *rela = (void *) sechdrs[relsec].sh_addr; - Elf64_Shdr *target_sec; - int ret; - - DEBUGP("%s: applying section %u (%u relocs) to %u\n", __func__, - relsec, n, sechdrs[relsec].sh_info); - - target_sec = sechdrs + sechdrs[relsec].sh_info; - - if (target_sec->sh_entsize == ~0UL) - /* - * If target section wasn't allocated, we don't need to relocate it. - * Happens, e.g., for debug sections. - */ - return 0; - - if (!mod->arch.gp) { - /* - * XXX Should have an arch-hook for running this after final section - * addresses have been selected... - */ - uint64_t gp; - struct module_memory *mod_mem; - - mod_mem = &mod->mem[MOD_DATA]; - if (mod_mem->size > MAX_LTOFF) - /* - * This takes advantage of fact that SHF_ARCH_SMALL gets allocated - * at the end of the module. - */ - gp = mod_mem->size - MAX_LTOFF / 2; - else - gp = mod_mem->size / 2; - gp = (uint64_t) mod_mem->base + ((gp + 7) & -8); - mod->arch.gp = gp; - DEBUGP("%s: placing gp at 0x%lx\n", __func__, gp); - } - - for (i = 0; i < n; i++) { - ret = do_reloc(mod, ELF64_R_TYPE(rela[i].r_info), - ((Elf64_Sym *) sechdrs[symindex].sh_addr - + ELF64_R_SYM(rela[i].r_info)), - rela[i].r_addend, target_sec, - (void *) target_sec->sh_addr + rela[i].r_offset); - if (ret < 0) - return ret; - } - return 0; -} - -/* - * Modules contain a single unwind table which covers both the core and the init text - * sections but since the two are not contiguous, we need to split this table up such that - * we can register (and unregister) each "segment" separately. Fortunately, this sounds - * more complicated than it really is. - */ -static void -register_unwind_table (struct module *mod) -{ - struct unw_table_entry *start = (void *) mod->arch.unwind->sh_addr; - struct unw_table_entry *end = start + mod->arch.unwind->sh_size / sizeof (*start); - struct unw_table_entry *e1, *e2, *core, *init; - unsigned long num_init = 0, num_core = 0; - - /* First, count how many init and core unwind-table entries there are. */ - for (e1 = start; e1 < end; ++e1) - if (in_init(mod, e1->start_offset)) - ++num_init; - else - ++num_core; - /* - * Second, sort the table such that all unwind-table entries for the init and core - * text sections are nicely separated. We do this with a stupid bubble sort - * (unwind tables don't get ridiculously huge). - */ - for (e1 = start; e1 < end; ++e1) { - for (e2 = e1 + 1; e2 < end; ++e2) { - if (e2->start_offset < e1->start_offset) { - swap(*e1, *e2); - } - } - } - /* - * Third, locate the init and core segments in the unwind table: - */ - if (in_init(mod, start->start_offset)) { - init = start; - core = start + num_init; - } else { - core = start; - init = start + num_core; - } - - DEBUGP("%s: name=%s, gp=%lx, num_init=%lu, num_core=%lu\n", __func__, - mod->name, mod->arch.gp, num_init, num_core); - - /* - * Fourth, register both tables (if not empty). - */ - if (num_core > 0) { - mod->arch.core_unw_table = unw_add_unwind_table(mod->name, 0, mod->arch.gp, - core, core + num_core); - DEBUGP("%s: core: handle=%p [%p-%p)\n", __func__, - mod->arch.core_unw_table, core, core + num_core); - } - if (num_init > 0) { - mod->arch.init_unw_table = unw_add_unwind_table(mod->name, 0, mod->arch.gp, - init, init + num_init); - DEBUGP("%s: init: handle=%p [%p-%p)\n", __func__, - mod->arch.init_unw_table, init, init + num_init); - } -} - -int -module_finalize (const Elf_Ehdr *hdr, const Elf_Shdr *sechdrs, struct module *mod) -{ - struct mod_arch_specific *mas = &mod->arch; - - DEBUGP("%s: init: entry=%p\n", __func__, mod->init); - if (mas->unwind) - register_unwind_table(mod); - - /* - * ".opd" was already relocated to the final destination. Store - * it's address for use in symbolizer. - */ - mas->opd_addr = (void *)mas->opd->sh_addr; - mas->opd_size = mas->opd->sh_size; - - /* - * Module relocation was already done at this point. Section - * headers are about to be deleted. Wipe out load-time context. - */ - mas->core_plt = NULL; - mas->init_plt = NULL; - mas->got = NULL; - mas->opd = NULL; - mas->unwind = NULL; - mas->gp = 0; - mas->next_got_entry = 0; - - return 0; -} - -void -module_arch_cleanup (struct module *mod) -{ - if (mod->arch.init_unw_table) { - unw_remove_unwind_table(mod->arch.init_unw_table); - mod->arch.init_unw_table = NULL; - } - if (mod->arch.core_unw_table) { - unw_remove_unwind_table(mod->arch.core_unw_table); - mod->arch.core_unw_table = NULL; - } -} - -void *dereference_module_function_descriptor(struct module *mod, void *ptr) -{ - struct mod_arch_specific *mas = &mod->arch; - - if (ptr < mas->opd_addr || ptr >= mas->opd_addr + mas->opd_size) - return ptr; - - return dereference_function_descriptor(ptr); -} |