671 lines
18 KiB
C
671 lines
18 KiB
C
/* Kernel module help for PPC64.
|
|
Copyright (C) 2001, 2003 Rusty Russell IBM Corporation.
|
|
|
|
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; either version 2 of the License, or
|
|
(at your option) any later version.
|
|
|
|
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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*/
|
|
|
|
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/elf.h>
|
|
#include <linux/moduleloader.h>
|
|
#include <linux/err.h>
|
|
#include <linux/vmalloc.h>
|
|
#include <linux/ftrace.h>
|
|
#include <linux/bug.h>
|
|
#include <linux/uaccess.h>
|
|
#include <asm/module.h>
|
|
#include <asm/firmware.h>
|
|
#include <asm/code-patching.h>
|
|
#include <linux/sort.h>
|
|
#include <asm/setup.h>
|
|
|
|
/* FIXME: We don't do .init separately. To do this, we'd need to have
|
|
a separate r2 value in the init and core section, and stub between
|
|
them, too.
|
|
|
|
Using a magic allocator which places modules within 32MB solves
|
|
this, and makes other things simpler. Anton?
|
|
--RR. */
|
|
|
|
#if defined(_CALL_ELF) && _CALL_ELF == 2
|
|
#define R2_STACK_OFFSET 24
|
|
|
|
/* An address is simply the address of the function. */
|
|
typedef unsigned long func_desc_t;
|
|
|
|
static func_desc_t func_desc(unsigned long addr)
|
|
{
|
|
return addr;
|
|
}
|
|
static unsigned long func_addr(unsigned long addr)
|
|
{
|
|
return addr;
|
|
}
|
|
static unsigned long stub_func_addr(func_desc_t func)
|
|
{
|
|
return func;
|
|
}
|
|
|
|
/* PowerPC64 specific values for the Elf64_Sym st_other field. */
|
|
#define STO_PPC64_LOCAL_BIT 5
|
|
#define STO_PPC64_LOCAL_MASK (7 << STO_PPC64_LOCAL_BIT)
|
|
#define PPC64_LOCAL_ENTRY_OFFSET(other) \
|
|
(((1 << (((other) & STO_PPC64_LOCAL_MASK) >> STO_PPC64_LOCAL_BIT)) >> 2) << 2)
|
|
|
|
static unsigned int local_entry_offset(const Elf64_Sym *sym)
|
|
{
|
|
/* sym->st_other indicates offset to local entry point
|
|
* (otherwise it will assume r12 is the address of the start
|
|
* of function and try to derive r2 from it). */
|
|
return PPC64_LOCAL_ENTRY_OFFSET(sym->st_other);
|
|
}
|
|
#else
|
|
#define R2_STACK_OFFSET 40
|
|
|
|
/* An address is address of the OPD entry, which contains address of fn. */
|
|
typedef struct ppc64_opd_entry func_desc_t;
|
|
|
|
static func_desc_t func_desc(unsigned long addr)
|
|
{
|
|
return *(struct ppc64_opd_entry *)addr;
|
|
}
|
|
static unsigned long func_addr(unsigned long addr)
|
|
{
|
|
return func_desc(addr).funcaddr;
|
|
}
|
|
static unsigned long stub_func_addr(func_desc_t func)
|
|
{
|
|
return func.funcaddr;
|
|
}
|
|
static unsigned int local_entry_offset(const Elf64_Sym *sym)
|
|
{
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
/* Like PPC32, we need little trampolines to do > 24-bit jumps (into
|
|
the kernel itself). But on PPC64, these need to be used for every
|
|
jump, actually, to reset r2 (TOC+0x8000). */
|
|
struct ppc64_stub_entry
|
|
{
|
|
/* 28 byte jump instruction sequence (7 instructions). We only
|
|
* need 6 instructions on ABIv2 but we always allocate 7 so
|
|
* so we don't have to modify the trampoline load instruction. */
|
|
u32 jump[7];
|
|
u32 unused;
|
|
/* Data for the above code */
|
|
func_desc_t funcdata;
|
|
};
|
|
|
|
/*
|
|
* PPC64 uses 24 bit jumps, but we need to jump into other modules or
|
|
* the kernel which may be further. So we jump to a stub.
|
|
*
|
|
* For ELFv1 we need to use this to set up the new r2 value (aka TOC
|
|
* pointer). For ELFv2 it's the callee's responsibility to set up the
|
|
* new r2, but for both we need to save the old r2.
|
|
*
|
|
* We could simply patch the new r2 value and function pointer into
|
|
* the stub, but it's significantly shorter to put these values at the
|
|
* end of the stub code, and patch the stub address (32-bits relative
|
|
* to the TOC ptr, r2) into the stub.
|
|
*/
|
|
|
|
static u32 ppc64_stub_insns[] = {
|
|
0x3d620000, /* addis r11,r2, <high> */
|
|
0x396b0000, /* addi r11,r11, <low> */
|
|
/* Save current r2 value in magic place on the stack. */
|
|
0xf8410000|R2_STACK_OFFSET, /* std r2,R2_STACK_OFFSET(r1) */
|
|
0xe98b0020, /* ld r12,32(r11) */
|
|
#if !defined(_CALL_ELF) || _CALL_ELF != 2
|
|
/* Set up new r2 from function descriptor */
|
|
0xe84b0028, /* ld r2,40(r11) */
|
|
#endif
|
|
0x7d8903a6, /* mtctr r12 */
|
|
0x4e800420 /* bctr */
|
|
};
|
|
|
|
#ifdef CONFIG_DYNAMIC_FTRACE
|
|
|
|
static u32 ppc64_stub_mask[] = {
|
|
0xffff0000,
|
|
0xffff0000,
|
|
0xffffffff,
|
|
0xffffffff,
|
|
#if !defined(_CALL_ELF) || _CALL_ELF != 2
|
|
0xffffffff,
|
|
#endif
|
|
0xffffffff,
|
|
0xffffffff
|
|
};
|
|
|
|
bool is_module_trampoline(u32 *p)
|
|
{
|
|
unsigned int i;
|
|
u32 insns[ARRAY_SIZE(ppc64_stub_insns)];
|
|
|
|
BUILD_BUG_ON(sizeof(ppc64_stub_insns) != sizeof(ppc64_stub_mask));
|
|
|
|
if (probe_kernel_read(insns, p, sizeof(insns)))
|
|
return -EFAULT;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(ppc64_stub_insns); i++) {
|
|
u32 insna = insns[i];
|
|
u32 insnb = ppc64_stub_insns[i];
|
|
u32 mask = ppc64_stub_mask[i];
|
|
|
|
if ((insna & mask) != (insnb & mask))
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
int module_trampoline_target(struct module *mod, u32 *trampoline,
|
|
unsigned long *target)
|
|
{
|
|
u32 buf[2];
|
|
u16 upper, lower;
|
|
long offset;
|
|
void *toc_entry;
|
|
|
|
if (probe_kernel_read(buf, trampoline, sizeof(buf)))
|
|
return -EFAULT;
|
|
|
|
upper = buf[0] & 0xffff;
|
|
lower = buf[1] & 0xffff;
|
|
|
|
/* perform the addis/addi, both signed */
|
|
offset = ((short)upper << 16) + (short)lower;
|
|
|
|
/*
|
|
* Now get the address this trampoline jumps to. This
|
|
* is always 32 bytes into our trampoline stub.
|
|
*/
|
|
toc_entry = (void *)mod->arch.toc + offset + 32;
|
|
|
|
if (probe_kernel_read(target, toc_entry, sizeof(*target)))
|
|
return -EFAULT;
|
|
|
|
return 0;
|
|
}
|
|
|
|
#endif
|
|
|
|
/* Count how many different 24-bit relocations (different symbol,
|
|
different addend) */
|
|
static unsigned int count_relocs(const Elf64_Rela *rela, unsigned int num)
|
|
{
|
|
unsigned int i, r_info, r_addend, _count_relocs;
|
|
|
|
/* FIXME: Only count external ones --RR */
|
|
_count_relocs = 0;
|
|
r_info = 0;
|
|
r_addend = 0;
|
|
for (i = 0; i < num; i++)
|
|
/* Only count 24-bit relocs, others don't need stubs */
|
|
if (ELF64_R_TYPE(rela[i].r_info) == R_PPC_REL24 &&
|
|
(r_info != ELF64_R_SYM(rela[i].r_info) ||
|
|
r_addend != rela[i].r_addend)) {
|
|
_count_relocs++;
|
|
r_info = ELF64_R_SYM(rela[i].r_info);
|
|
r_addend = rela[i].r_addend;
|
|
}
|
|
|
|
return _count_relocs;
|
|
}
|
|
|
|
static int relacmp(const void *_x, const void *_y)
|
|
{
|
|
const Elf64_Rela *x, *y;
|
|
|
|
y = (Elf64_Rela *)_x;
|
|
x = (Elf64_Rela *)_y;
|
|
|
|
/* Compare the entire r_info (as opposed to ELF64_R_SYM(r_info) only) to
|
|
* make the comparison cheaper/faster. It won't affect the sorting or
|
|
* the counting algorithms' performance
|
|
*/
|
|
if (x->r_info < y->r_info)
|
|
return -1;
|
|
else if (x->r_info > y->r_info)
|
|
return 1;
|
|
else if (x->r_addend < y->r_addend)
|
|
return -1;
|
|
else if (x->r_addend > y->r_addend)
|
|
return 1;
|
|
else
|
|
return 0;
|
|
}
|
|
|
|
static void relaswap(void *_x, void *_y, int size)
|
|
{
|
|
uint64_t *x, *y, tmp;
|
|
int i;
|
|
|
|
y = (uint64_t *)_x;
|
|
x = (uint64_t *)_y;
|
|
|
|
for (i = 0; i < sizeof(Elf64_Rela) / sizeof(uint64_t); i++) {
|
|
tmp = x[i];
|
|
x[i] = y[i];
|
|
y[i] = tmp;
|
|
}
|
|
}
|
|
|
|
/* Get size of potential trampolines required. */
|
|
static unsigned long get_stubs_size(const Elf64_Ehdr *hdr,
|
|
const Elf64_Shdr *sechdrs)
|
|
{
|
|
/* One extra reloc so it's always 0-funcaddr terminated */
|
|
unsigned long relocs = 1;
|
|
unsigned i;
|
|
|
|
/* Every relocated section... */
|
|
for (i = 1; i < hdr->e_shnum; i++) {
|
|
if (sechdrs[i].sh_type == SHT_RELA) {
|
|
pr_debug("Found relocations in section %u\n", i);
|
|
pr_debug("Ptr: %p. Number: %Lu\n",
|
|
(void *)sechdrs[i].sh_addr,
|
|
sechdrs[i].sh_size / sizeof(Elf64_Rela));
|
|
|
|
/* Sort the relocation information based on a symbol and
|
|
* addend key. This is a stable O(n*log n) complexity
|
|
* alogrithm but it will reduce the complexity of
|
|
* count_relocs() to linear complexity O(n)
|
|
*/
|
|
sort((void *)sechdrs[i].sh_addr,
|
|
sechdrs[i].sh_size / sizeof(Elf64_Rela),
|
|
sizeof(Elf64_Rela), relacmp, relaswap);
|
|
|
|
relocs += count_relocs((void *)sechdrs[i].sh_addr,
|
|
sechdrs[i].sh_size
|
|
/ sizeof(Elf64_Rela));
|
|
}
|
|
}
|
|
|
|
#ifdef CONFIG_DYNAMIC_FTRACE
|
|
/* make the trampoline to the ftrace_caller */
|
|
relocs++;
|
|
#endif
|
|
|
|
pr_debug("Looks like a total of %lu stubs, max\n", relocs);
|
|
return relocs * sizeof(struct ppc64_stub_entry);
|
|
}
|
|
|
|
/* Still needed for ELFv2, for .TOC. */
|
|
static void dedotify_versions(struct modversion_info *vers,
|
|
unsigned long size)
|
|
{
|
|
struct modversion_info *end;
|
|
|
|
for (end = (void *)vers + size; vers < end; vers++)
|
|
if (vers->name[0] == '.') {
|
|
memmove(vers->name, vers->name+1, strlen(vers->name));
|
|
#ifdef ARCH_RELOCATES_KCRCTAB
|
|
/* The TOC symbol has no CRC computed. To avoid CRC
|
|
* check failing, we must force it to the expected
|
|
* value (see CRC check in module.c).
|
|
*/
|
|
if (!strcmp(vers->name, "TOC."))
|
|
vers->crc = -(unsigned long)reloc_start;
|
|
#endif
|
|
}
|
|
}
|
|
|
|
/* Undefined symbols which refer to .funcname, hack to funcname (or .TOC.) */
|
|
static void dedotify(Elf64_Sym *syms, unsigned int numsyms, char *strtab)
|
|
{
|
|
unsigned int i;
|
|
|
|
for (i = 1; i < numsyms; i++) {
|
|
if (syms[i].st_shndx == SHN_UNDEF) {
|
|
char *name = strtab + syms[i].st_name;
|
|
if (name[0] == '.')
|
|
memmove(name, name+1, strlen(name));
|
|
}
|
|
}
|
|
}
|
|
|
|
static Elf64_Sym *find_dot_toc(Elf64_Shdr *sechdrs,
|
|
const char *strtab,
|
|
unsigned int symindex)
|
|
{
|
|
unsigned int i, numsyms;
|
|
Elf64_Sym *syms;
|
|
|
|
syms = (Elf64_Sym *)sechdrs[symindex].sh_addr;
|
|
numsyms = sechdrs[symindex].sh_size / sizeof(Elf64_Sym);
|
|
|
|
for (i = 1; i < numsyms; i++) {
|
|
if (syms[i].st_shndx == SHN_UNDEF
|
|
&& strcmp(strtab + syms[i].st_name, "TOC.") == 0)
|
|
return &syms[i];
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
int module_frob_arch_sections(Elf64_Ehdr *hdr,
|
|
Elf64_Shdr *sechdrs,
|
|
char *secstrings,
|
|
struct module *me)
|
|
{
|
|
unsigned int i;
|
|
|
|
/* Find .toc and .stubs sections, symtab and strtab */
|
|
for (i = 1; i < hdr->e_shnum; i++) {
|
|
char *p;
|
|
if (strcmp(secstrings + sechdrs[i].sh_name, ".stubs") == 0)
|
|
me->arch.stubs_section = i;
|
|
else if (strcmp(secstrings + sechdrs[i].sh_name, ".toc") == 0)
|
|
me->arch.toc_section = i;
|
|
else if (strcmp(secstrings+sechdrs[i].sh_name,"__versions")==0)
|
|
dedotify_versions((void *)hdr + sechdrs[i].sh_offset,
|
|
sechdrs[i].sh_size);
|
|
|
|
/* We don't handle .init for the moment: rename to _init */
|
|
while ((p = strstr(secstrings + sechdrs[i].sh_name, ".init")))
|
|
p[0] = '_';
|
|
|
|
if (sechdrs[i].sh_type == SHT_SYMTAB)
|
|
dedotify((void *)hdr + sechdrs[i].sh_offset,
|
|
sechdrs[i].sh_size / sizeof(Elf64_Sym),
|
|
(void *)hdr
|
|
+ sechdrs[sechdrs[i].sh_link].sh_offset);
|
|
}
|
|
|
|
if (!me->arch.stubs_section) {
|
|
pr_err("%s: doesn't contain .stubs.\n", me->name);
|
|
return -ENOEXEC;
|
|
}
|
|
|
|
/* If we don't have a .toc, just use .stubs. We need to set r2
|
|
to some reasonable value in case the module calls out to
|
|
other functions via a stub, or if a function pointer escapes
|
|
the module by some means. */
|
|
if (!me->arch.toc_section)
|
|
me->arch.toc_section = me->arch.stubs_section;
|
|
|
|
/* Override the stubs size */
|
|
sechdrs[me->arch.stubs_section].sh_size = get_stubs_size(hdr, sechdrs);
|
|
return 0;
|
|
}
|
|
|
|
/* r2 is the TOC pointer: it actually points 0x8000 into the TOC (this
|
|
gives the value maximum span in an instruction which uses a signed
|
|
offset) */
|
|
static inline unsigned long my_r2(Elf64_Shdr *sechdrs, struct module *me)
|
|
{
|
|
return sechdrs[me->arch.toc_section].sh_addr + 0x8000;
|
|
}
|
|
|
|
/* Both low and high 16 bits are added as SIGNED additions, so if low
|
|
16 bits has high bit set, high 16 bits must be adjusted. These
|
|
macros do that (stolen from binutils). */
|
|
#define PPC_LO(v) ((v) & 0xffff)
|
|
#define PPC_HI(v) (((v) >> 16) & 0xffff)
|
|
#define PPC_HA(v) PPC_HI ((v) + 0x8000)
|
|
|
|
/* Patch stub to reference function and correct r2 value. */
|
|
static inline int create_stub(Elf64_Shdr *sechdrs,
|
|
struct ppc64_stub_entry *entry,
|
|
unsigned long addr,
|
|
struct module *me)
|
|
{
|
|
long reladdr;
|
|
|
|
memcpy(entry->jump, ppc64_stub_insns, sizeof(ppc64_stub_insns));
|
|
|
|
/* Stub uses address relative to r2. */
|
|
reladdr = (unsigned long)entry - my_r2(sechdrs, me);
|
|
if (reladdr > 0x7FFFFFFF || reladdr < -(0x80000000L)) {
|
|
pr_err("%s: Address %p of stub out of range of %p.\n",
|
|
me->name, (void *)reladdr, (void *)my_r2);
|
|
return 0;
|
|
}
|
|
pr_debug("Stub %p get data from reladdr %li\n", entry, reladdr);
|
|
|
|
entry->jump[0] |= PPC_HA(reladdr);
|
|
entry->jump[1] |= PPC_LO(reladdr);
|
|
entry->funcdata = func_desc(addr);
|
|
return 1;
|
|
}
|
|
|
|
/* Create stub to jump to function described in this OPD/ptr: we need the
|
|
stub to set up the TOC ptr (r2) for the function. */
|
|
static unsigned long stub_for_addr(Elf64_Shdr *sechdrs,
|
|
unsigned long addr,
|
|
struct module *me)
|
|
{
|
|
struct ppc64_stub_entry *stubs;
|
|
unsigned int i, num_stubs;
|
|
|
|
num_stubs = sechdrs[me->arch.stubs_section].sh_size / sizeof(*stubs);
|
|
|
|
/* Find this stub, or if that fails, the next avail. entry */
|
|
stubs = (void *)sechdrs[me->arch.stubs_section].sh_addr;
|
|
for (i = 0; stub_func_addr(stubs[i].funcdata); i++) {
|
|
BUG_ON(i >= num_stubs);
|
|
|
|
if (stub_func_addr(stubs[i].funcdata) == func_addr(addr))
|
|
return (unsigned long)&stubs[i];
|
|
}
|
|
|
|
if (!create_stub(sechdrs, &stubs[i], addr, me))
|
|
return 0;
|
|
|
|
return (unsigned long)&stubs[i];
|
|
}
|
|
|
|
/* We expect a noop next: if it is, replace it with instruction to
|
|
restore r2. */
|
|
static int restore_r2(u32 *instruction, struct module *me)
|
|
{
|
|
if (*instruction != PPC_INST_NOP) {
|
|
pr_err("%s: Expect noop after relocate, got %08x\n",
|
|
me->name, *instruction);
|
|
return 0;
|
|
}
|
|
/* ld r2,R2_STACK_OFFSET(r1) */
|
|
*instruction = 0xe8410000 | R2_STACK_OFFSET;
|
|
return 1;
|
|
}
|
|
|
|
int apply_relocate_add(Elf64_Shdr *sechdrs,
|
|
const char *strtab,
|
|
unsigned int symindex,
|
|
unsigned int relsec,
|
|
struct module *me)
|
|
{
|
|
unsigned int i;
|
|
Elf64_Rela *rela = (void *)sechdrs[relsec].sh_addr;
|
|
Elf64_Sym *sym;
|
|
unsigned long *location;
|
|
unsigned long value;
|
|
|
|
pr_debug("Applying ADD relocate section %u to %u\n", relsec,
|
|
sechdrs[relsec].sh_info);
|
|
|
|
/* First time we're called, we can fix up .TOC. */
|
|
if (!me->arch.toc_fixed) {
|
|
sym = find_dot_toc(sechdrs, strtab, symindex);
|
|
/* It's theoretically possible that a module doesn't want a
|
|
* .TOC. so don't fail it just for that. */
|
|
if (sym)
|
|
sym->st_value = my_r2(sechdrs, me);
|
|
me->arch.toc_fixed = true;
|
|
}
|
|
|
|
for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rela); i++) {
|
|
/* This is where to make the change */
|
|
location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr
|
|
+ rela[i].r_offset;
|
|
/* This is the symbol it is referring to */
|
|
sym = (Elf64_Sym *)sechdrs[symindex].sh_addr
|
|
+ ELF64_R_SYM(rela[i].r_info);
|
|
|
|
pr_debug("RELOC at %p: %li-type as %s (0x%lx) + %li\n",
|
|
location, (long)ELF64_R_TYPE(rela[i].r_info),
|
|
strtab + sym->st_name, (unsigned long)sym->st_value,
|
|
(long)rela[i].r_addend);
|
|
|
|
/* `Everything is relative'. */
|
|
value = sym->st_value + rela[i].r_addend;
|
|
|
|
switch (ELF64_R_TYPE(rela[i].r_info)) {
|
|
case R_PPC64_ADDR32:
|
|
/* Simply set it */
|
|
*(u32 *)location = value;
|
|
break;
|
|
|
|
case R_PPC64_ADDR64:
|
|
/* Simply set it */
|
|
*(unsigned long *)location = value;
|
|
break;
|
|
|
|
case R_PPC64_TOC:
|
|
*(unsigned long *)location = my_r2(sechdrs, me);
|
|
break;
|
|
|
|
case R_PPC64_TOC16:
|
|
/* Subtract TOC pointer */
|
|
value -= my_r2(sechdrs, me);
|
|
if (value + 0x8000 > 0xffff) {
|
|
pr_err("%s: bad TOC16 relocation (0x%lx)\n",
|
|
me->name, value);
|
|
return -ENOEXEC;
|
|
}
|
|
*((uint16_t *) location)
|
|
= (*((uint16_t *) location) & ~0xffff)
|
|
| (value & 0xffff);
|
|
break;
|
|
|
|
case R_PPC64_TOC16_LO:
|
|
/* Subtract TOC pointer */
|
|
value -= my_r2(sechdrs, me);
|
|
*((uint16_t *) location)
|
|
= (*((uint16_t *) location) & ~0xffff)
|
|
| (value & 0xffff);
|
|
break;
|
|
|
|
case R_PPC64_TOC16_DS:
|
|
/* Subtract TOC pointer */
|
|
value -= my_r2(sechdrs, me);
|
|
if ((value & 3) != 0 || value + 0x8000 > 0xffff) {
|
|
pr_err("%s: bad TOC16_DS relocation (0x%lx)\n",
|
|
me->name, value);
|
|
return -ENOEXEC;
|
|
}
|
|
*((uint16_t *) location)
|
|
= (*((uint16_t *) location) & ~0xfffc)
|
|
| (value & 0xfffc);
|
|
break;
|
|
|
|
case R_PPC64_TOC16_LO_DS:
|
|
/* Subtract TOC pointer */
|
|
value -= my_r2(sechdrs, me);
|
|
if ((value & 3) != 0) {
|
|
pr_err("%s: bad TOC16_LO_DS relocation (0x%lx)\n",
|
|
me->name, value);
|
|
return -ENOEXEC;
|
|
}
|
|
*((uint16_t *) location)
|
|
= (*((uint16_t *) location) & ~0xfffc)
|
|
| (value & 0xfffc);
|
|
break;
|
|
|
|
case R_PPC64_TOC16_HA:
|
|
/* Subtract TOC pointer */
|
|
value -= my_r2(sechdrs, me);
|
|
value = ((value + 0x8000) >> 16);
|
|
*((uint16_t *) location)
|
|
= (*((uint16_t *) location) & ~0xffff)
|
|
| (value & 0xffff);
|
|
break;
|
|
|
|
case R_PPC_REL24:
|
|
/* FIXME: Handle weak symbols here --RR */
|
|
if (sym->st_shndx == SHN_UNDEF) {
|
|
/* External: go via stub */
|
|
value = stub_for_addr(sechdrs, value, me);
|
|
if (!value)
|
|
return -ENOENT;
|
|
if (!restore_r2((u32 *)location + 1, me))
|
|
return -ENOEXEC;
|
|
} else
|
|
value += local_entry_offset(sym);
|
|
|
|
/* Convert value to relative */
|
|
value -= (unsigned long)location;
|
|
if (value + 0x2000000 > 0x3ffffff || (value & 3) != 0){
|
|
pr_err("%s: REL24 %li out of range!\n",
|
|
me->name, (long int)value);
|
|
return -ENOEXEC;
|
|
}
|
|
|
|
/* Only replace bits 2 through 26 */
|
|
*(uint32_t *)location
|
|
= (*(uint32_t *)location & ~0x03fffffc)
|
|
| (value & 0x03fffffc);
|
|
break;
|
|
|
|
case R_PPC64_REL64:
|
|
/* 64 bits relative (used by features fixups) */
|
|
*location = value - (unsigned long)location;
|
|
break;
|
|
|
|
case R_PPC64_TOCSAVE:
|
|
/*
|
|
* Marker reloc indicates we don't have to save r2.
|
|
* That would only save us one instruction, so ignore
|
|
* it.
|
|
*/
|
|
break;
|
|
|
|
case R_PPC64_REL16_HA:
|
|
/* Subtract location pointer */
|
|
value -= (unsigned long)location;
|
|
value = ((value + 0x8000) >> 16);
|
|
*((uint16_t *) location)
|
|
= (*((uint16_t *) location) & ~0xffff)
|
|
| (value & 0xffff);
|
|
break;
|
|
|
|
case R_PPC64_REL16_LO:
|
|
/* Subtract location pointer */
|
|
value -= (unsigned long)location;
|
|
*((uint16_t *) location)
|
|
= (*((uint16_t *) location) & ~0xffff)
|
|
| (value & 0xffff);
|
|
break;
|
|
|
|
default:
|
|
pr_err("%s: Unknown ADD relocation: %lu\n",
|
|
me->name,
|
|
(unsigned long)ELF64_R_TYPE(rela[i].r_info));
|
|
return -ENOEXEC;
|
|
}
|
|
}
|
|
|
|
#ifdef CONFIG_DYNAMIC_FTRACE
|
|
me->arch.toc = my_r2(sechdrs, me);
|
|
me->arch.tramp = stub_for_addr(sechdrs,
|
|
(unsigned long)ftrace_caller,
|
|
me);
|
|
#endif
|
|
|
|
return 0;
|
|
}
|