277 lines
7.8 KiB
C
277 lines
7.8 KiB
C
/* dl.c - arch-dependent part of loadable module support */
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/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2002,2004,2005,2007,2009 Free Software Foundation, Inc.
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*
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* GRUB is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* GRUB is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <grub/dl.h>
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#include <grub/elf.h>
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#include <grub/misc.h>
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#include <grub/err.h>
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#include <grub/mm.h>
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#include <grub/i18n.h>
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/* Check if EHDR is a valid ELF header. */
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grub_err_t
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grub_arch_dl_check_header (void *ehdr)
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{
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Elf_Ehdr *e = ehdr;
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/* Check the magic numbers. */
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if (e->e_ident[EI_CLASS] != ELFCLASS64
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|| e->e_ident[EI_DATA] != ELFDATA2LSB
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|| e->e_machine != EM_IA_64)
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return grub_error (GRUB_ERR_BAD_OS, N_("invalid arch dependent ELF magic"));
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return GRUB_ERR_NONE;
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}
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#define MASK20 ((1 << 20) - 1)
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#define MASK19 ((1 << 19) - 1)
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struct unaligned_uint32
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{
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grub_uint32_t val;
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} __attribute__ ((packed));
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static void
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add_value_to_slot_20b (grub_addr_t addr, grub_uint32_t value)
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{
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struct unaligned_uint32 *p;
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switch (addr & 3)
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{
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case 0:
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p = (struct unaligned_uint32 *) ((addr & ~3ULL) + 2);
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p->val = ((((((p->val >> 2) & MASK20) + value) & MASK20) << 2)
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| (p->val & ~(MASK20 << 2)));
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break;
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case 1:
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p = (struct unaligned_uint32 *) ((grub_uint8_t *) (addr & ~3ULL) + 7);
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p->val = ((((((p->val >> 3) & MASK20) + value) & MASK20) << 3)
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| (p->val & ~(MASK20 << 3)));
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break;
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case 2:
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p = (struct unaligned_uint32 *) ((grub_uint8_t *) (addr & ~3ULL) + 12);
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p->val = ((((((p->val >> 4) & MASK20) + value) & MASK20) << 4)
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| (p->val & ~(MASK20 << 4)));
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break;
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}
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}
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#define MASKF21 ( ((1 << 23) - 1) & ~((1 << 7) | (1 << 8)) )
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static grub_uint32_t
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add_value_to_slot_21_real (grub_uint32_t a, grub_uint32_t value)
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{
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grub_uint32_t high, mid, low, c;
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low = (a & 0x00007f);
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mid = (a & 0x7fc000) >> 7;
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high = (a & 0x003e00) << 7;
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c = (low | mid | high) + value;
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return (c & 0x7f) | ((c << 7) & 0x7fc000) | ((c >> 7) & 0x0003e00); //0x003e00
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}
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static void
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add_value_to_slot_21 (grub_addr_t addr, grub_uint32_t value)
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{
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struct unaligned_uint32 *p;
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switch (addr & 3)
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{
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case 0:
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p = (struct unaligned_uint32 *) ((addr & ~3ULL) + 2);
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p->val = ((add_value_to_slot_21_real (((p->val >> 2) & MASKF21), value) & MASKF21) << 2) | (p->val & ~(MASKF21 << 2));
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break;
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case 1:
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p = (struct unaligned_uint32 *) ((grub_uint8_t *) (addr & ~3ULL) + 7);
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p->val = ((add_value_to_slot_21_real (((p->val >> 3) & MASKF21), value) & MASKF21) << 3) | (p->val & ~(MASKF21 << 3));
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break;
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case 2:
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p = (struct unaligned_uint32 *) ((grub_uint8_t *) (addr & ~3ULL) + 12);
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p->val = ((add_value_to_slot_21_real (((p->val >> 4) & MASKF21), value) & MASKF21) << 4) | (p->val & ~(MASKF21 << 4));
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break;
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}
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}
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static const grub_uint8_t nopm[5] =
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{
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/* [MLX] nop.m 0x0 */
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0x05, 0x00, 0x00, 0x00, 0x01
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};
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static const grub_uint8_t jump[0x20] =
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{
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/* ld8 r16=[r15],8 */
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0x02, 0x80, 0x20, 0x1e, 0x18, 0x14,
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/* mov r14=r1;; */
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0xe0, 0x00, 0x04, 0x00, 0x42, 0x00,
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/* nop.i 0x0 */
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0x00, 0x00, 0x04, 0x00,
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/* ld8 r1=[r15] */
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0x11, 0x08, 0x00, 0x1e, 0x18, 0x10,
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/* mov b6=r16 */
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0x60, 0x80, 0x04, 0x80, 0x03, 0x00,
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/* br.few b6;; */
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0x60, 0x00, 0x80, 0x00
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};
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struct ia64_trampoline
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{
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/* nop.m */
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grub_uint8_t nop[5];
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/* movl r15 = addr*/
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grub_uint8_t addr_hi[6];
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grub_uint8_t e0;
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grub_uint8_t addr_lo[4];
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grub_uint8_t jump[0x20];
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};
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static void
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make_trampoline (struct ia64_trampoline *tr, grub_uint64_t addr)
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{
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COMPILE_TIME_ASSERT (sizeof (struct ia64_trampoline)
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== GRUB_IA64_DL_TRAMP_SIZE);
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grub_memcpy (tr->nop, nopm, sizeof (tr->nop));
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tr->addr_hi[0] = ((addr & 0xc00000) >> 16);
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tr->addr_hi[1] = (addr >> 24) & 0xff;
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tr->addr_hi[2] = (addr >> 32) & 0xff;
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tr->addr_hi[3] = (addr >> 40) & 0xff;
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tr->addr_hi[4] = (addr >> 48) & 0xff;
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tr->addr_hi[5] = (addr >> 56) & 0xff;
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tr->e0 = 0xe0;
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tr->addr_lo[0] = ((addr & 0x000f) << 4) | 0x01;
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tr->addr_lo[1] = (((addr & 0x0070) >> 4) | ((addr & 0x070000) >> 11)
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| ((addr & 0x200000) >> 17));
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tr->addr_lo[2] = ((addr & 0x1f80) >> 5) | ((addr & 0x180000) >> 19);
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tr->addr_lo[3] = ((addr & 0xe000) >> 13) | 0x60;
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grub_memcpy (tr->jump, jump, sizeof (tr->jump));
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}
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/* Relocate symbols. */
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grub_err_t
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grub_arch_dl_relocate_symbols (grub_dl_t mod, void *ehdr)
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{
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Elf_Ehdr *e = ehdr;
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Elf_Shdr *s;
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Elf_Word entsize;
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unsigned i;
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grub_uint64_t *gp, *gpptr;
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struct ia64_trampoline *tr;
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gp = (grub_uint64_t *) mod->base;
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gpptr = (grub_uint64_t *) mod->got;
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tr = mod->tramp;
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/* Find a symbol table. */
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for (i = 0, s = (Elf_Shdr *) ((char *) e + e->e_shoff);
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i < e->e_shnum;
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i++, s = (Elf_Shdr *) ((char *) s + e->e_shentsize))
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if (s->sh_type == SHT_SYMTAB)
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break;
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if (i == e->e_shnum)
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return grub_error (GRUB_ERR_BAD_MODULE, N_("no symbol table"));
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entsize = s->sh_entsize;
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for (i = 0, s = (Elf_Shdr *) ((char *) e + e->e_shoff);
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i < e->e_shnum;
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i++, s = (Elf_Shdr *) ((char *) s + e->e_shentsize))
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if (s->sh_type == SHT_RELA)
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{
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grub_dl_segment_t seg;
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/* Find the target segment. */
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for (seg = mod->segment; seg; seg = seg->next)
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if (seg->section == s->sh_info)
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break;
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if (seg)
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{
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Elf_Rela *rel, *max;
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for (rel = (Elf_Rela *) ((char *) e + s->sh_offset),
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max = rel + s->sh_size / s->sh_entsize;
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rel < max;
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rel++)
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{
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grub_addr_t addr;
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Elf_Sym *sym;
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grub_uint64_t value;
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if (seg->size < (rel->r_offset & ~3))
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return grub_error (GRUB_ERR_BAD_MODULE,
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"reloc offset is out of the segment");
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addr = (grub_addr_t) seg->addr + rel->r_offset;
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sym = (Elf_Sym *) ((char *) mod->symtab
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+ entsize * ELF_R_SYM (rel->r_info));
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/* On the PPC the value does not have an explicit
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addend, add it. */
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value = sym->st_value + rel->r_addend;
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switch (ELF_R_TYPE (rel->r_info))
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{
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case R_IA64_PCREL21B:
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{
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grub_uint64_t noff;
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make_trampoline (tr, value);
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noff = ((char *) tr - (char *) (addr & ~3)) >> 4;
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tr++;
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if (noff & ~MASK19)
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return grub_error (GRUB_ERR_BAD_OS,
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"trampoline offset too big (%lx)", noff);
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add_value_to_slot_20b (addr, noff);
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}
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break;
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case R_IA64_SEGREL64LSB:
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*(grub_uint64_t *) addr += value - (grub_addr_t) seg->addr;
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break;
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case R_IA64_FPTR64LSB:
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case R_IA64_DIR64LSB:
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*(grub_uint64_t *) addr += value;
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break;
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case R_IA64_PCREL64LSB:
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*(grub_uint64_t *) addr += value - addr;
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break;
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case R_IA64_GPREL22:
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add_value_to_slot_21 (addr, value - (grub_addr_t) gp);
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break;
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case R_IA64_LTOFF22X:
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case R_IA64_LTOFF22:
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if (ELF_ST_TYPE (sym->st_info) == STT_FUNC)
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value = *(grub_uint64_t *) sym->st_value + rel->r_addend;
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case R_IA64_LTOFF_FPTR22:
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*gpptr = value;
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add_value_to_slot_21 (addr, (grub_addr_t) gpptr - (grub_addr_t) gp);
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gpptr++;
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break;
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/* We treat LTOFF22X as LTOFF22, so we can ignore LDXMOV. */
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case R_IA64_LDXMOV:
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break;
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default:
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return grub_error (GRUB_ERR_NOT_IMPLEMENTED_YET,
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N_("relocation 0x%x is not implemented yet"),
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ELF_R_TYPE (rel->r_info));
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}
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}
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}
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}
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return GRUB_ERR_NONE;
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}
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