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/*
* Copyright (C) 2005-2006 Zou Nan hai (nanhai.zou@intel.com)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation (version 2 of the License).
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/* pugatory relocation code
* Most of the code in this file is
* based on arch/ia64/kernel/module.c in Linux kernel
*/
/* Most of the code in this file is
* based on arch/ia64/kernel/module.c in Linux kernel
*/
#include <stdio.h>
#include <elf.h>
#include "../../kexec.h"
#include "../../kexec-elf.h"
#define MAX_LTOFF ((uint64_t) (1 << 22))
int machine_verify_elf_rel(struct mem_ehdr *ehdr)
{
if (ehdr->ei_data != ELFDATA2LSB) {
return 0;
}
if (ehdr->ei_class != ELFCLASS64) {
return 0;
}
if (ehdr->e_machine != EM_IA_64) {
return 0;
}
return 1;
}
static void
ia64_patch (uint64_t insn_addr, uint64_t mask, uint64_t val)
{
uint64_t m0, m1, v0, v1, b0, b1, *b = (uint64_t *) (insn_addr & -16);
# define insn_mask ((1UL << 41) - 1)
unsigned long shift;
b0 = b[0]; b1 = b[1];
shift = 5 + 41 * (insn_addr % 16); /* 5 bits of template, then 3 x 41-bit instructions */
if (shift >= 64) {
m1 = mask << (shift - 64);
v1 = val << (shift - 64);
} else {
m0 = mask << shift; m1 = mask >> (64 - shift);
v0 = val << shift; v1 = val >> (64 - shift);
b[0] = (b0 & ~m0) | (v0 & m0);
}
b[1] = (b1 & ~m1) | (v1 & m1);
}
static inline uint64_t
bundle (const uint64_t insn)
{
return insn & ~0xfUL;
}
void machine_apply_elf_rel(struct mem_ehdr *ehdr, unsigned long r_type,
void *location, unsigned long address, unsigned long value)
{
uint64_t gp_value = ehdr->rel_addr + 0x200000;
switch(r_type) {
case R_IA64_NONE:
break;
case R_IA64_SEGREL64LSB:
case R_IA64_DIR64LSB:
*((uint64_t *)location) = value;
break;
case R_IA64_DIR32LSB:
*((uint32_t *)location) = value;
if (value != *((uint32_t *)location))
goto overflow;
break;
case R_IA64_IMM64:
ia64_patch((uint64_t)location, 0x01fffefe000UL,
/* bit 63 -> 36 */
(((value & 0x8000000000000000UL) >> 27)
/* bit 21 -> 21 */
| ((value & 0x0000000000200000UL) << 0)
/* bit 16 -> 22 */
| ((value & 0x00000000001f0000UL) << 6)
/* bit 7 -> 27 */
| ((value & 0x000000000000ff80UL) << 20)
/* bit 0 -> 13 */
| ((value & 0x000000000000007fUL) << 13)));
ia64_patch((uint64_t)location - 1, 0x1ffffffffffUL, value>>22);
break;
case R_IA64_IMM22:
if (value + (1 << 21) >= (1 << 22))
die("value out of IMM22 range\n");
ia64_patch((uint64_t)location, 0x01fffcfe000UL,
/* bit 21 -> 36 */
(((value & 0x200000UL) << 15)
/* bit 16 -> 22 */
| ((value & 0x1f0000UL) << 6)
/* bit 7 -> 27 */
| ((value & 0x00ff80UL) << 20)
/* bit 0 -> 13 */
| ((value & 0x00007fUL) << 13) ));
break;
case R_IA64_PCREL21B: {
uint64_t delta = ((int64_t)value - (int64_t)address)/16;
if (delta + (1 << 20) >= (1 << 21))
die("value out of IMM21B range\n");
value = ((int64_t)(value - bundle(address)))/16;
ia64_patch((uint64_t)location, 0x11ffffe000UL,
(((value & 0x100000UL) << 16) /* bit 20 -> 36 */
| ((value & 0x0fffffUL) << 13) /* bit 0 -> 13 */));
}
break;
case R_IA64_PCREL64LSB: {
value = value - address;
put_unaligned(value, (uint64_t *)location);
} break;
case R_IA64_GPREL22:
case R_IA64_LTOFF22X:
if (value - gp_value + MAX_LTOFF/2 >= MAX_LTOFF)
die("value out of gp relative range");
value -= gp_value;
ia64_patch((uint64_t)location, 0x01fffcfe000UL,
(((value & 0x200000UL) << 15) /* bit 21 -> 36 */
|((value & 0x1f0000UL) << 6) /* bit 16 -> 22 */
|((value & 0x00ff80UL) << 20) /* bit 7 -> 27 */
|((value & 0x00007fUL) << 13) /* bit 0 -> 13 */));
break;
case R_IA64_LDXMOV:
if (value - gp_value + MAX_LTOFF/2 >= MAX_LTOFF)
die("value out of gp relative range");
ia64_patch((uint64_t)location, 0x1fff80fe000UL, 0x10000000000UL);
break;
case R_IA64_LTOFF22:
default:
die("Unknown rela relocation: 0x%lx 0x%lx\n",
r_type, address);
break;
}
return;
overflow:
die("overflow in relocation type %lu val %Lx\n",
r_type, value);
}
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