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-rw-r--r--arch/ia64/kernel/module.c936
1 files changed, 0 insertions, 936 deletions
diff --git a/arch/ia64/kernel/module.c b/arch/ia64/kernel/module.c
deleted file mode 100644
index 1a42ba885188..000000000000
--- a/arch/ia64/kernel/module.c
+++ /dev/null
@@ -1,936 +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 int
-in_init (const struct module *mod, uint64_t addr)
-{
- return addr - (uint64_t) mod->init_layout.base < mod->init_layout.size;
-}
-
-static inline int
-in_core (const struct module *mod, uint64_t addr)
-{
- return addr - (uint64_t) mod->core_layout.base < mod->core_layout.size;
-}
-
-static inline int
-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->ip) {
- if (fdesc->ip == value)
- return (uint64_t)fdesc;
- if ((uint64_t) ++fdesc >= mod->arch.opd->sh_addr + mod->arch.opd->sh_size)
- BUG();
- }
-
- /* Create new one */
- fdesc->ip = 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);
- /* FALL THROUGH */
- 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->init_layout.base : mod->core_layout.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;
- if (mod->core_layout.size > MAX_LTOFF)
- /*
- * This takes advantage of fact that SHF_ARCH_SMALL gets allocated
- * at the end of the module.
- */
- gp = mod->core_layout.size - MAX_LTOFF / 2;
- else
- gp = mod->core_layout.size / 2;
- gp = (uint64_t) mod->core_layout.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 tmp, *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) {
- tmp = *e1;
- *e1 = *e2;
- *e2 = tmp;
- }
- }
- }
- /*
- * 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)
-{
- DEBUGP("%s: init: entry=%p\n", __func__, mod->init);
- if (mod->arch.unwind)
- register_unwind_table(mod);
- 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)
-{
- Elf64_Shdr *opd = mod->arch.opd;
-
- if (ptr < (void *)opd->sh_addr ||
- ptr >= (void *)(opd->sh_addr + opd->sh_size))
- return ptr;
-
- return dereference_function_descriptor(ptr);
-}
generated by cgit (git 2.34.1) at 2024-05-08 07:43:07 +0000