linux/arch/parisc/kernel/module.c
Andrey Ryabinin cb9e3c292d mm: vmalloc: pass additional vm_flags to __vmalloc_node_range()
For instrumenting global variables KASan will shadow memory backing memory
for modules.  So on module loading we will need to allocate memory for
shadow and map it at address in shadow that corresponds to the address
allocated in module_alloc().

__vmalloc_node_range() could be used for this purpose, except it puts a
guard hole after allocated area.  Guard hole in shadow memory should be a
problem because at some future point we might need to have a shadow memory
at address occupied by guard hole.  So we could fail to allocate shadow
for module_alloc().

Now we have VM_NO_GUARD flag disabling guard page, so we need to pass into
__vmalloc_node_range().  Add new parameter 'vm_flags' to
__vmalloc_node_range() function.

Signed-off-by: Andrey Ryabinin <a.ryabinin@samsung.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Konstantin Serebryany <kcc@google.com>
Cc: Dmitry Chernenkov <dmitryc@google.com>
Signed-off-by: Andrey Konovalov <adech.fo@gmail.com>
Cc: Yuri Gribov <tetra2005@gmail.com>
Cc: Konstantin Khlebnikov <koct9i@gmail.com>
Cc: Sasha Levin <sasha.levin@oracle.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: David Rientjes <rientjes@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2015-02-13 21:21:42 -08:00

941 lines
25 KiB
C

/* Kernel dynamically loadable module help for PARISC.
*
* The best reference for this stuff is probably the Processor-
* Specific ELF Supplement for PA-RISC:
* http://ftp.parisc-linux.org/docs/arch/elf-pa-hp.pdf
*
* Linux/PA-RISC Project (http://www.parisc-linux.org/)
* Copyright (C) 2003 Randolph Chung <tausq at debian . org>
* Copyright (C) 2008 Helge Deller <deller@gmx.de>
*
*
* 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
*
*
* Notes:
* - PLT stub handling
* On 32bit (and sometimes 64bit) and with big kernel modules like xfs or
* ipv6 the relocation types R_PARISC_PCREL17F and R_PARISC_PCREL22F may
* fail to reach their PLT stub if we only create one big stub array for
* all sections at the beginning of the core or init section.
* Instead we now insert individual PLT stub entries directly in front of
* of the code sections where the stubs are actually called.
* This reduces the distance between the PCREL location and the stub entry
* so that the relocations can be fulfilled.
* While calculating the final layout of the kernel module in memory, the
* kernel module loader calls arch_mod_section_prepend() to request the
* to be reserved amount of memory in front of each individual section.
*
* - SEGREL32 handling
* We are not doing SEGREL32 handling correctly. According to the ABI, we
* should do a value offset, like this:
* if (in_init(me, (void *)val))
* val -= (uint32_t)me->module_init;
* else
* val -= (uint32_t)me->module_core;
* However, SEGREL32 is used only for PARISC unwind entries, and we want
* those entries to have an absolute address, and not just an offset.
*
* The unwind table mechanism has the ability to specify an offset for
* the unwind table; however, because we split off the init functions into
* a different piece of memory, it is not possible to do this using a
* single offset. Instead, we use the above hack for now.
*/
#include <linux/moduleloader.h>
#include <linux/elf.h>
#include <linux/vmalloc.h>
#include <linux/fs.h>
#include <linux/string.h>
#include <linux/kernel.h>
#include <linux/bug.h>
#include <linux/mm.h>
#include <linux/slab.h>
#include <asm/pgtable.h>
#include <asm/unwind.h>
#if 0
#define DEBUGP printk
#else
#define DEBUGP(fmt...)
#endif
#define RELOC_REACHABLE(val, bits) \
(( ( !((val) & (1<<((bits)-1))) && ((val)>>(bits)) != 0 ) || \
( ((val) & (1<<((bits)-1))) && ((val)>>(bits)) != (((__typeof__(val))(~0))>>((bits)+2)))) ? \
0 : 1)
#define CHECK_RELOC(val, bits) \
if (!RELOC_REACHABLE(val, bits)) { \
printk(KERN_ERR "module %s relocation of symbol %s is out of range (0x%lx in %d bits)\n", \
me->name, strtab + sym->st_name, (unsigned long)val, bits); \
return -ENOEXEC; \
}
/* Maximum number of GOT entries. We use a long displacement ldd from
* the bottom of the table, which has a maximum signed displacement of
* 0x3fff; however, since we're only going forward, this becomes
* 0x1fff, and thus, since each GOT entry is 8 bytes long we can have
* at most 1023 entries.
* To overcome this 14bit displacement with some kernel modules, we'll
* use instead the unusal 16bit displacement method (see reassemble_16a)
* which gives us a maximum positive displacement of 0x7fff, and as such
* allows us to allocate up to 4095 GOT entries. */
#define MAX_GOTS 4095
/* three functions to determine where in the module core
* or init pieces the location is */
static inline int in_init(struct module *me, void *loc)
{
return (loc >= me->module_init &&
loc <= (me->module_init + me->init_size));
}
static inline int in_core(struct module *me, void *loc)
{
return (loc >= me->module_core &&
loc <= (me->module_core + me->core_size));
}
static inline int in_local(struct module *me, void *loc)
{
return in_init(me, loc) || in_core(me, loc);
}
#ifndef CONFIG_64BIT
struct got_entry {
Elf32_Addr addr;
};
struct stub_entry {
Elf32_Word insns[2]; /* each stub entry has two insns */
};
#else
struct got_entry {
Elf64_Addr addr;
};
struct stub_entry {
Elf64_Word insns[4]; /* each stub entry has four insns */
};
#endif
/* Field selection types defined by hppa */
#define rnd(x) (((x)+0x1000)&~0x1fff)
/* fsel: full 32 bits */
#define fsel(v,a) ((v)+(a))
/* lsel: select left 21 bits */
#define lsel(v,a) (((v)+(a))>>11)
/* rsel: select right 11 bits */
#define rsel(v,a) (((v)+(a))&0x7ff)
/* lrsel with rounding of addend to nearest 8k */
#define lrsel(v,a) (((v)+rnd(a))>>11)
/* rrsel with rounding of addend to nearest 8k */
#define rrsel(v,a) ((((v)+rnd(a))&0x7ff)+((a)-rnd(a)))
#define mask(x,sz) ((x) & ~((1<<(sz))-1))
/* The reassemble_* functions prepare an immediate value for
insertion into an opcode. pa-risc uses all sorts of weird bitfields
in the instruction to hold the value. */
static inline int sign_unext(int x, int len)
{
int len_ones;
len_ones = (1 << len) - 1;
return x & len_ones;
}
static inline int low_sign_unext(int x, int len)
{
int sign, temp;
sign = (x >> (len-1)) & 1;
temp = sign_unext(x, len-1);
return (temp << 1) | sign;
}
static inline int reassemble_14(int as14)
{
return (((as14 & 0x1fff) << 1) |
((as14 & 0x2000) >> 13));
}
static inline int reassemble_16a(int as16)
{
int s, t;
/* Unusual 16-bit encoding, for wide mode only. */
t = (as16 << 1) & 0xffff;
s = (as16 & 0x8000);
return (t ^ s ^ (s >> 1)) | (s >> 15);
}
static inline int reassemble_17(int as17)
{
return (((as17 & 0x10000) >> 16) |
((as17 & 0x0f800) << 5) |
((as17 & 0x00400) >> 8) |
((as17 & 0x003ff) << 3));
}
static inline int reassemble_21(int as21)
{
return (((as21 & 0x100000) >> 20) |
((as21 & 0x0ffe00) >> 8) |
((as21 & 0x000180) << 7) |
((as21 & 0x00007c) << 14) |
((as21 & 0x000003) << 12));
}
static inline int reassemble_22(int as22)
{
return (((as22 & 0x200000) >> 21) |
((as22 & 0x1f0000) << 5) |
((as22 & 0x00f800) << 5) |
((as22 & 0x000400) >> 8) |
((as22 & 0x0003ff) << 3));
}
void *module_alloc(unsigned long size)
{
/* using RWX means less protection for modules, but it's
* easier than trying to map the text, data, init_text and
* init_data correctly */
return __vmalloc_node_range(size, 1, VMALLOC_START, VMALLOC_END,
GFP_KERNEL | __GFP_HIGHMEM,
PAGE_KERNEL_RWX, 0, NUMA_NO_NODE,
__builtin_return_address(0));
}
#ifndef CONFIG_64BIT
static inline unsigned long count_gots(const Elf_Rela *rela, unsigned long n)
{
return 0;
}
static inline unsigned long count_fdescs(const Elf_Rela *rela, unsigned long n)
{
return 0;
}
static inline unsigned long count_stubs(const Elf_Rela *rela, unsigned long n)
{
unsigned long cnt = 0;
for (; n > 0; n--, rela++)
{
switch (ELF32_R_TYPE(rela->r_info)) {
case R_PARISC_PCREL17F:
case R_PARISC_PCREL22F:
cnt++;
}
}
return cnt;
}
#else
static inline unsigned long count_gots(const Elf_Rela *rela, unsigned long n)
{
unsigned long cnt = 0;
for (; n > 0; n--, rela++)
{
switch (ELF64_R_TYPE(rela->r_info)) {
case R_PARISC_LTOFF21L:
case R_PARISC_LTOFF14R:
case R_PARISC_PCREL22F:
cnt++;
}
}
return cnt;
}
static inline unsigned long count_fdescs(const Elf_Rela *rela, unsigned long n)
{
unsigned long cnt = 0;
for (; n > 0; n--, rela++)
{
switch (ELF64_R_TYPE(rela->r_info)) {
case R_PARISC_FPTR64:
cnt++;
}
}
return cnt;
}
static inline unsigned long count_stubs(const Elf_Rela *rela, unsigned long n)
{
unsigned long cnt = 0;
for (; n > 0; n--, rela++)
{
switch (ELF64_R_TYPE(rela->r_info)) {
case R_PARISC_PCREL22F:
cnt++;
}
}
return cnt;
}
#endif
void module_arch_freeing_init(struct module *mod)
{
kfree(mod->arch.section);
mod->arch.section = NULL;
}
/* Additional bytes needed in front of individual sections */
unsigned int arch_mod_section_prepend(struct module *mod,
unsigned int section)
{
/* size needed for all stubs of this section (including
* one additional for correct alignment of the stubs) */
return (mod->arch.section[section].stub_entries + 1)
* sizeof(struct stub_entry);
}
#define CONST
int module_frob_arch_sections(CONST Elf_Ehdr *hdr,
CONST Elf_Shdr *sechdrs,
CONST char *secstrings,
struct module *me)
{
unsigned long gots = 0, fdescs = 0, len;
unsigned int i;
len = hdr->e_shnum * sizeof(me->arch.section[0]);
me->arch.section = kzalloc(len, GFP_KERNEL);
if (!me->arch.section)
return -ENOMEM;
for (i = 1; i < hdr->e_shnum; i++) {
const Elf_Rela *rels = (void *)sechdrs[i].sh_addr;
unsigned long nrels = sechdrs[i].sh_size / sizeof(*rels);
unsigned int count, s;
if (strncmp(secstrings + sechdrs[i].sh_name,
".PARISC.unwind", 14) == 0)
me->arch.unwind_section = i;
if (sechdrs[i].sh_type != SHT_RELA)
continue;
/* some of these are not relevant for 32-bit/64-bit
* we leave them here to make the code common. the
* compiler will do its thing and optimize out the
* stuff we don't need
*/
gots += count_gots(rels, nrels);
fdescs += count_fdescs(rels, nrels);
/* XXX: By sorting the relocs and finding duplicate entries
* we could reduce the number of necessary stubs and save
* some memory. */
count = count_stubs(rels, nrels);
if (!count)
continue;
/* so we need relocation stubs. reserve necessary memory. */
/* sh_info gives the section for which we need to add stubs. */
s = sechdrs[i].sh_info;
/* each code section should only have one relocation section */
WARN_ON(me->arch.section[s].stub_entries);
/* store number of stubs we need for this section */
me->arch.section[s].stub_entries += count;
}
/* align things a bit */
me->core_size = ALIGN(me->core_size, 16);
me->arch.got_offset = me->core_size;
me->core_size += gots * sizeof(struct got_entry);
me->core_size = ALIGN(me->core_size, 16);
me->arch.fdesc_offset = me->core_size;
me->core_size += fdescs * sizeof(Elf_Fdesc);
me->arch.got_max = gots;
me->arch.fdesc_max = fdescs;
return 0;
}
#ifdef CONFIG_64BIT
static Elf64_Word get_got(struct module *me, unsigned long value, long addend)
{
unsigned int i;
struct got_entry *got;
value += addend;
BUG_ON(value == 0);
got = me->module_core + me->arch.got_offset;
for (i = 0; got[i].addr; i++)
if (got[i].addr == value)
goto out;
BUG_ON(++me->arch.got_count > me->arch.got_max);
got[i].addr = value;
out:
DEBUGP("GOT ENTRY %d[%x] val %lx\n", i, i*sizeof(struct got_entry),
value);
return i * sizeof(struct got_entry);
}
#endif /* CONFIG_64BIT */
#ifdef CONFIG_64BIT
static Elf_Addr get_fdesc(struct module *me, unsigned long value)
{
Elf_Fdesc *fdesc = me->module_core + me->arch.fdesc_offset;
if (!value) {
printk(KERN_ERR "%s: zero OPD requested!\n", me->name);
return 0;
}
/* Look for existing fdesc entry. */
while (fdesc->addr) {
if (fdesc->addr == value)
return (Elf_Addr)fdesc;
fdesc++;
}
BUG_ON(++me->arch.fdesc_count > me->arch.fdesc_max);
/* Create new one */
fdesc->addr = value;
fdesc->gp = (Elf_Addr)me->module_core + me->arch.got_offset;
return (Elf_Addr)fdesc;
}
#endif /* CONFIG_64BIT */
enum elf_stub_type {
ELF_STUB_GOT,
ELF_STUB_MILLI,
ELF_STUB_DIRECT,
};
static Elf_Addr get_stub(struct module *me, unsigned long value, long addend,
enum elf_stub_type stub_type, Elf_Addr loc0, unsigned int targetsec)
{
struct stub_entry *stub;
int __maybe_unused d;
/* initialize stub_offset to point in front of the section */
if (!me->arch.section[targetsec].stub_offset) {
loc0 -= (me->arch.section[targetsec].stub_entries + 1) *
sizeof(struct stub_entry);
/* get correct alignment for the stubs */
loc0 = ALIGN(loc0, sizeof(struct stub_entry));
me->arch.section[targetsec].stub_offset = loc0;
}
/* get address of stub entry */
stub = (void *) me->arch.section[targetsec].stub_offset;
me->arch.section[targetsec].stub_offset += sizeof(struct stub_entry);
/* do not write outside available stub area */
BUG_ON(0 == me->arch.section[targetsec].stub_entries--);
#ifndef CONFIG_64BIT
/* for 32-bit the stub looks like this:
* ldil L'XXX,%r1
* be,n R'XXX(%sr4,%r1)
*/
//value = *(unsigned long *)((value + addend) & ~3); /* why? */
stub->insns[0] = 0x20200000; /* ldil L'XXX,%r1 */
stub->insns[1] = 0xe0202002; /* be,n R'XXX(%sr4,%r1) */
stub->insns[0] |= reassemble_21(lrsel(value, addend));
stub->insns[1] |= reassemble_17(rrsel(value, addend) / 4);
#else
/* for 64-bit we have three kinds of stubs:
* for normal function calls:
* ldd 0(%dp),%dp
* ldd 10(%dp), %r1
* bve (%r1)
* ldd 18(%dp), %dp
*
* for millicode:
* ldil 0, %r1
* ldo 0(%r1), %r1
* ldd 10(%r1), %r1
* bve,n (%r1)
*
* for direct branches (jumps between different section of the
* same module):
* ldil 0, %r1
* ldo 0(%r1), %r1
* bve,n (%r1)
*/
switch (stub_type) {
case ELF_STUB_GOT:
d = get_got(me, value, addend);
if (d <= 15) {
/* Format 5 */
stub->insns[0] = 0x0f6010db; /* ldd 0(%dp),%dp */
stub->insns[0] |= low_sign_unext(d, 5) << 16;
} else {
/* Format 3 */
stub->insns[0] = 0x537b0000; /* ldd 0(%dp),%dp */
stub->insns[0] |= reassemble_16a(d);
}
stub->insns[1] = 0x53610020; /* ldd 10(%dp),%r1 */
stub->insns[2] = 0xe820d000; /* bve (%r1) */
stub->insns[3] = 0x537b0030; /* ldd 18(%dp),%dp */
break;
case ELF_STUB_MILLI:
stub->insns[0] = 0x20200000; /* ldil 0,%r1 */
stub->insns[1] = 0x34210000; /* ldo 0(%r1), %r1 */
stub->insns[2] = 0x50210020; /* ldd 10(%r1),%r1 */
stub->insns[3] = 0xe820d002; /* bve,n (%r1) */
stub->insns[0] |= reassemble_21(lrsel(value, addend));
stub->insns[1] |= reassemble_14(rrsel(value, addend));
break;
case ELF_STUB_DIRECT:
stub->insns[0] = 0x20200000; /* ldil 0,%r1 */
stub->insns[1] = 0x34210000; /* ldo 0(%r1), %r1 */
stub->insns[2] = 0xe820d002; /* bve,n (%r1) */
stub->insns[0] |= reassemble_21(lrsel(value, addend));
stub->insns[1] |= reassemble_14(rrsel(value, addend));
break;
}
#endif
return (Elf_Addr)stub;
}
#ifndef CONFIG_64BIT
int apply_relocate_add(Elf_Shdr *sechdrs,
const char *strtab,
unsigned int symindex,
unsigned int relsec,
struct module *me)
{
int i;
Elf32_Rela *rel = (void *)sechdrs[relsec].sh_addr;
Elf32_Sym *sym;
Elf32_Word *loc;
Elf32_Addr val;
Elf32_Sword addend;
Elf32_Addr dot;
Elf_Addr loc0;
unsigned int targetsec = sechdrs[relsec].sh_info;
//unsigned long dp = (unsigned long)$global$;
register unsigned long dp asm ("r27");
DEBUGP("Applying relocate section %u to %u\n", relsec,
targetsec);
for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
/* This is where to make the change */
loc = (void *)sechdrs[targetsec].sh_addr
+ rel[i].r_offset;
/* This is the start of the target section */
loc0 = sechdrs[targetsec].sh_addr;
/* This is the symbol it is referring to */
sym = (Elf32_Sym *)sechdrs[symindex].sh_addr
+ ELF32_R_SYM(rel[i].r_info);
if (!sym->st_value) {
printk(KERN_WARNING "%s: Unknown symbol %s\n",
me->name, strtab + sym->st_name);
return -ENOENT;
}
//dot = (sechdrs[relsec].sh_addr + rel->r_offset) & ~0x03;
dot = (Elf32_Addr)loc & ~0x03;
val = sym->st_value;
addend = rel[i].r_addend;
#if 0
#define r(t) ELF32_R_TYPE(rel[i].r_info)==t ? #t :
DEBUGP("Symbol %s loc 0x%x val 0x%x addend 0x%x: %s\n",
strtab + sym->st_name,
(uint32_t)loc, val, addend,
r(R_PARISC_PLABEL32)
r(R_PARISC_DIR32)
r(R_PARISC_DIR21L)
r(R_PARISC_DIR14R)
r(R_PARISC_SEGREL32)
r(R_PARISC_DPREL21L)
r(R_PARISC_DPREL14R)
r(R_PARISC_PCREL17F)
r(R_PARISC_PCREL22F)
"UNKNOWN");
#undef r
#endif
switch (ELF32_R_TYPE(rel[i].r_info)) {
case R_PARISC_PLABEL32:
/* 32-bit function address */
/* no function descriptors... */
*loc = fsel(val, addend);
break;
case R_PARISC_DIR32:
/* direct 32-bit ref */
*loc = fsel(val, addend);
break;
case R_PARISC_DIR21L:
/* left 21 bits of effective address */
val = lrsel(val, addend);
*loc = mask(*loc, 21) | reassemble_21(val);
break;
case R_PARISC_DIR14R:
/* right 14 bits of effective address */
val = rrsel(val, addend);
*loc = mask(*loc, 14) | reassemble_14(val);
break;
case R_PARISC_SEGREL32:
/* 32-bit segment relative address */
/* See note about special handling of SEGREL32 at
* the beginning of this file.
*/
*loc = fsel(val, addend);
break;
case R_PARISC_DPREL21L:
/* left 21 bit of relative address */
val = lrsel(val - dp, addend);
*loc = mask(*loc, 21) | reassemble_21(val);
break;
case R_PARISC_DPREL14R:
/* right 14 bit of relative address */
val = rrsel(val - dp, addend);
*loc = mask(*loc, 14) | reassemble_14(val);
break;
case R_PARISC_PCREL17F:
/* 17-bit PC relative address */
/* calculate direct call offset */
val += addend;
val = (val - dot - 8)/4;
if (!RELOC_REACHABLE(val, 17)) {
/* direct distance too far, create
* stub entry instead */
val = get_stub(me, sym->st_value, addend,
ELF_STUB_DIRECT, loc0, targetsec);
val = (val - dot - 8)/4;
CHECK_RELOC(val, 17);
}
*loc = (*loc & ~0x1f1ffd) | reassemble_17(val);
break;
case R_PARISC_PCREL22F:
/* 22-bit PC relative address; only defined for pa20 */
/* calculate direct call offset */
val += addend;
val = (val - dot - 8)/4;
if (!RELOC_REACHABLE(val, 22)) {
/* direct distance too far, create
* stub entry instead */
val = get_stub(me, sym->st_value, addend,
ELF_STUB_DIRECT, loc0, targetsec);
val = (val - dot - 8)/4;
CHECK_RELOC(val, 22);
}
*loc = (*loc & ~0x3ff1ffd) | reassemble_22(val);
break;
default:
printk(KERN_ERR "module %s: Unknown relocation: %u\n",
me->name, ELF32_R_TYPE(rel[i].r_info));
return -ENOEXEC;
}
}
return 0;
}
#else
int apply_relocate_add(Elf_Shdr *sechdrs,
const char *strtab,
unsigned int symindex,
unsigned int relsec,
struct module *me)
{
int i;
Elf64_Rela *rel = (void *)sechdrs[relsec].sh_addr;
Elf64_Sym *sym;
Elf64_Word *loc;
Elf64_Xword *loc64;
Elf64_Addr val;
Elf64_Sxword addend;
Elf64_Addr dot;
Elf_Addr loc0;
unsigned int targetsec = sechdrs[relsec].sh_info;
DEBUGP("Applying relocate section %u to %u\n", relsec,
targetsec);
for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
/* This is where to make the change */
loc = (void *)sechdrs[targetsec].sh_addr
+ rel[i].r_offset;
/* This is the start of the target section */
loc0 = sechdrs[targetsec].sh_addr;
/* This is the symbol it is referring to */
sym = (Elf64_Sym *)sechdrs[symindex].sh_addr
+ ELF64_R_SYM(rel[i].r_info);
if (!sym->st_value) {
printk(KERN_WARNING "%s: Unknown symbol %s\n",
me->name, strtab + sym->st_name);
return -ENOENT;
}
//dot = (sechdrs[relsec].sh_addr + rel->r_offset) & ~0x03;
dot = (Elf64_Addr)loc & ~0x03;
loc64 = (Elf64_Xword *)loc;
val = sym->st_value;
addend = rel[i].r_addend;
#if 0
#define r(t) ELF64_R_TYPE(rel[i].r_info)==t ? #t :
printk("Symbol %s loc %p val 0x%Lx addend 0x%Lx: %s\n",
strtab + sym->st_name,
loc, val, addend,
r(R_PARISC_LTOFF14R)
r(R_PARISC_LTOFF21L)
r(R_PARISC_PCREL22F)
r(R_PARISC_DIR64)
r(R_PARISC_SEGREL32)
r(R_PARISC_FPTR64)
"UNKNOWN");
#undef r
#endif
switch (ELF64_R_TYPE(rel[i].r_info)) {
case R_PARISC_LTOFF21L:
/* LT-relative; left 21 bits */
val = get_got(me, val, addend);
DEBUGP("LTOFF21L Symbol %s loc %p val %lx\n",
strtab + sym->st_name,
loc, val);
val = lrsel(val, 0);
*loc = mask(*loc, 21) | reassemble_21(val);
break;
case R_PARISC_LTOFF14R:
/* L(ltoff(val+addend)) */
/* LT-relative; right 14 bits */
val = get_got(me, val, addend);
val = rrsel(val, 0);
DEBUGP("LTOFF14R Symbol %s loc %p val %lx\n",
strtab + sym->st_name,
loc, val);
*loc = mask(*loc, 14) | reassemble_14(val);
break;
case R_PARISC_PCREL22F:
/* PC-relative; 22 bits */
DEBUGP("PCREL22F Symbol %s loc %p val %lx\n",
strtab + sym->st_name,
loc, val);
val += addend;
/* can we reach it locally? */
if (in_local(me, (void *)val)) {
/* this is the case where the symbol is local
* to the module, but in a different section,
* so stub the jump in case it's more than 22
* bits away */
val = (val - dot - 8)/4;
if (!RELOC_REACHABLE(val, 22)) {
/* direct distance too far, create
* stub entry instead */
val = get_stub(me, sym->st_value,
addend, ELF_STUB_DIRECT,
loc0, targetsec);
} else {
/* Ok, we can reach it directly. */
val = sym->st_value;
val += addend;
}
} else {
val = sym->st_value;
if (strncmp(strtab + sym->st_name, "$$", 2)
== 0)
val = get_stub(me, val, addend, ELF_STUB_MILLI,
loc0, targetsec);
else
val = get_stub(me, val, addend, ELF_STUB_GOT,
loc0, targetsec);
}
DEBUGP("STUB FOR %s loc %lx, val %lx+%lx at %lx\n",
strtab + sym->st_name, loc, sym->st_value,
addend, val);
val = (val - dot - 8)/4;
CHECK_RELOC(val, 22);
*loc = (*loc & ~0x3ff1ffd) | reassemble_22(val);
break;
case R_PARISC_DIR64:
/* 64-bit effective address */
*loc64 = val + addend;
break;
case R_PARISC_SEGREL32:
/* 32-bit segment relative address */
/* See note about special handling of SEGREL32 at
* the beginning of this file.
*/
*loc = fsel(val, addend);
break;
case R_PARISC_FPTR64:
/* 64-bit function address */
if(in_local(me, (void *)(val + addend))) {
*loc64 = get_fdesc(me, val+addend);
DEBUGP("FDESC for %s at %p points to %lx\n",
strtab + sym->st_name, *loc64,
((Elf_Fdesc *)*loc64)->addr);
} else {
/* if the symbol is not local to this
* module then val+addend is a pointer
* to the function descriptor */
DEBUGP("Non local FPTR64 Symbol %s loc %p val %lx\n",
strtab + sym->st_name,
loc, val);
*loc64 = val + addend;
}
break;
default:
printk(KERN_ERR "module %s: Unknown relocation: %Lu\n",
me->name, ELF64_R_TYPE(rel[i].r_info));
return -ENOEXEC;
}
}
return 0;
}
#endif
static void
register_unwind_table(struct module *me,
const Elf_Shdr *sechdrs)
{
unsigned char *table, *end;
unsigned long gp;
if (!me->arch.unwind_section)
return;
table = (unsigned char *)sechdrs[me->arch.unwind_section].sh_addr;
end = table + sechdrs[me->arch.unwind_section].sh_size;
gp = (Elf_Addr)me->module_core + me->arch.got_offset;
DEBUGP("register_unwind_table(), sect = %d at 0x%p - 0x%p (gp=0x%lx)\n",
me->arch.unwind_section, table, end, gp);
me->arch.unwind = unwind_table_add(me->name, 0, gp, table, end);
}
static void
deregister_unwind_table(struct module *me)
{
if (me->arch.unwind)
unwind_table_remove(me->arch.unwind);
}
int module_finalize(const Elf_Ehdr *hdr,
const Elf_Shdr *sechdrs,
struct module *me)
{
int i;
unsigned long nsyms;
const char *strtab = NULL;
Elf_Sym *newptr, *oldptr;
Elf_Shdr *symhdr = NULL;
#ifdef DEBUG
Elf_Fdesc *entry;
u32 *addr;
entry = (Elf_Fdesc *)me->init;
printk("FINALIZE, ->init FPTR is %p, GP %lx ADDR %lx\n", entry,
entry->gp, entry->addr);
addr = (u32 *)entry->addr;
printk("INSNS: %x %x %x %x\n",
addr[0], addr[1], addr[2], addr[3]);
printk("got entries used %ld, gots max %ld\n"
"fdescs used %ld, fdescs max %ld\n",
me->arch.got_count, me->arch.got_max,
me->arch.fdesc_count, me->arch.fdesc_max);
#endif
register_unwind_table(me, sechdrs);
/* haven't filled in me->symtab yet, so have to find it
* ourselves */
for (i = 1; i < hdr->e_shnum; i++) {
if(sechdrs[i].sh_type == SHT_SYMTAB
&& (sechdrs[i].sh_flags & SHF_ALLOC)) {
int strindex = sechdrs[i].sh_link;
/* FIXME: AWFUL HACK
* The cast is to drop the const from
* the sechdrs pointer */
symhdr = (Elf_Shdr *)&sechdrs[i];
strtab = (char *)sechdrs[strindex].sh_addr;
break;
}
}
DEBUGP("module %s: strtab %p, symhdr %p\n",
me->name, strtab, symhdr);
if(me->arch.got_count > MAX_GOTS) {
printk(KERN_ERR "%s: Global Offset Table overflow (used %ld, allowed %d)\n",
me->name, me->arch.got_count, MAX_GOTS);
return -EINVAL;
}
kfree(me->arch.section);
me->arch.section = NULL;
/* no symbol table */
if(symhdr == NULL)
return 0;
oldptr = (void *)symhdr->sh_addr;
newptr = oldptr + 1; /* we start counting at 1 */
nsyms = symhdr->sh_size / sizeof(Elf_Sym);
DEBUGP("OLD num_symtab %lu\n", nsyms);
for (i = 1; i < nsyms; i++) {
oldptr++; /* note, count starts at 1 so preincrement */
if(strncmp(strtab + oldptr->st_name,
".L", 2) == 0)
continue;
if(newptr != oldptr)
*newptr++ = *oldptr;
else
newptr++;
}
nsyms = newptr - (Elf_Sym *)symhdr->sh_addr;
DEBUGP("NEW num_symtab %lu\n", nsyms);
symhdr->sh_size = nsyms * sizeof(Elf_Sym);
return 0;
}
void module_arch_cleanup(struct module *mod)
{
deregister_unwind_table(mod);
}