powerpc: Move most remaining ppc64 files over to arch/powerpc
Also deletes files in arch/ppc64 that are no longer used now that we don't compile with ARCH=ppc64 any more. Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Paul Mackerras
455
arch/powerpc/kernel/module_64.c
Normal file
455
arch/powerpc/kernel/module_64.c
Normal file
@@ -0,0 +1,455 @@
|
||||
/* 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
|
||||
*/
|
||||
#include <linux/module.h>
|
||||
#include <linux/elf.h>
|
||||
#include <linux/moduleloader.h>
|
||||
#include <linux/err.h>
|
||||
#include <linux/vmalloc.h>
|
||||
#include <asm/module.h>
|
||||
#include <asm/uaccess.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 0
|
||||
#define DEBUGP printk
|
||||
#else
|
||||
#define DEBUGP(fmt , ...)
|
||||
#endif
|
||||
|
||||
/* There's actually a third entry here, but it's unused */
|
||||
struct ppc64_opd_entry
|
||||
{
|
||||
unsigned long funcaddr;
|
||||
unsigned long r2;
|
||||
};
|
||||
|
||||
/* 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) */
|
||||
unsigned char jump[28];
|
||||
unsigned char unused[4];
|
||||
/* Data for the above code */
|
||||
struct ppc64_opd_entry opd;
|
||||
};
|
||||
|
||||
/* We use a stub to fix up r2 (TOC ptr) and to jump to the (external)
|
||||
function which may be more than 24-bits away. 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 struct ppc64_stub_entry ppc64_stub =
|
||||
{ .jump = {
|
||||
0x3d, 0x82, 0x00, 0x00, /* addis r12,r2, <high> */
|
||||
0x39, 0x8c, 0x00, 0x00, /* addi r12,r12, <low> */
|
||||
/* Save current r2 value in magic place on the stack. */
|
||||
0xf8, 0x41, 0x00, 0x28, /* std r2,40(r1) */
|
||||
0xe9, 0x6c, 0x00, 0x20, /* ld r11,32(r12) */
|
||||
0xe8, 0x4c, 0x00, 0x28, /* ld r2,40(r12) */
|
||||
0x7d, 0x69, 0x03, 0xa6, /* mtctr r11 */
|
||||
0x4e, 0x80, 0x04, 0x20 /* bctr */
|
||||
} };
|
||||
|
||||
/* 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, j, ret = 0;
|
||||
|
||||
/* FIXME: Only count external ones --RR */
|
||||
/* Sure, this is order(n^2), but it's usually short, and not
|
||||
time critical */
|
||||
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)
|
||||
continue;
|
||||
for (j = 0; j < i; j++) {
|
||||
/* If this addend appeared before, it's
|
||||
already been counted */
|
||||
if (rela[i].r_info == rela[j].r_info
|
||||
&& rela[i].r_addend == rela[j].r_addend)
|
||||
break;
|
||||
}
|
||||
if (j == i) ret++;
|
||||
}
|
||||
return ret;
|
||||
}
|
||||
|
||||
void *module_alloc(unsigned long size)
|
||||
{
|
||||
if (size == 0)
|
||||
return NULL;
|
||||
|
||||
return vmalloc_exec(size);
|
||||
}
|
||||
|
||||
/* Free memory returned from module_alloc */
|
||||
void module_free(struct module *mod, void *module_region)
|
||||
{
|
||||
vfree(module_region);
|
||||
/* FIXME: If module_region == mod->init_region, trim exception
|
||||
table entries. */
|
||||
}
|
||||
|
||||
/* 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) {
|
||||
DEBUGP("Found relocations in section %u\n", i);
|
||||
DEBUGP("Ptr: %p. Number: %lu\n",
|
||||
(void *)sechdrs[i].sh_addr,
|
||||
sechdrs[i].sh_size / sizeof(Elf64_Rela));
|
||||
relocs += count_relocs((void *)sechdrs[i].sh_addr,
|
||||
sechdrs[i].sh_size
|
||||
/ sizeof(Elf64_Rela));
|
||||
}
|
||||
}
|
||||
|
||||
DEBUGP("Looks like a total of %lu stubs, max\n", relocs);
|
||||
return relocs * sizeof(struct ppc64_stub_entry);
|
||||
}
|
||||
|
||||
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));
|
||||
}
|
||||
|
||||
/* Undefined symbols which refer to .funcname, hack to funcname */
|
||||
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));
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
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 || !me->arch.toc_section) {
|
||||
printk("%s: doesn't contain .toc or .stubs.\n", me->name);
|
||||
return -ENOEXEC;
|
||||
}
|
||||
|
||||
/* Override the stubs size */
|
||||
sechdrs[me->arch.stubs_section].sh_size = get_stubs_size(hdr, sechdrs);
|
||||
return 0;
|
||||
}
|
||||
|
||||
int apply_relocate(Elf64_Shdr *sechdrs,
|
||||
const char *strtab,
|
||||
unsigned int symindex,
|
||||
unsigned int relsec,
|
||||
struct module *me)
|
||||
{
|
||||
printk(KERN_ERR "%s: Non-ADD RELOCATION unsupported\n", me->name);
|
||||
return -ENOEXEC;
|
||||
}
|
||||
|
||||
/* 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,
|
||||
struct ppc64_opd_entry *opd,
|
||||
struct module *me)
|
||||
{
|
||||
Elf64_Half *loc1, *loc2;
|
||||
long reladdr;
|
||||
|
||||
*entry = ppc64_stub;
|
||||
|
||||
loc1 = (Elf64_Half *)&entry->jump[2];
|
||||
loc2 = (Elf64_Half *)&entry->jump[6];
|
||||
|
||||
/* Stub uses address relative to r2. */
|
||||
reladdr = (unsigned long)entry - my_r2(sechdrs, me);
|
||||
if (reladdr > 0x7FFFFFFF || reladdr < -(0x80000000L)) {
|
||||
printk("%s: Address %p of stub out of range of %p.\n",
|
||||
me->name, (void *)reladdr, (void *)my_r2);
|
||||
return 0;
|
||||
}
|
||||
DEBUGP("Stub %p get data from reladdr %li\n", entry, reladdr);
|
||||
|
||||
*loc1 = PPC_HA(reladdr);
|
||||
*loc2 = PPC_LO(reladdr);
|
||||
entry->opd.funcaddr = opd->funcaddr;
|
||||
entry->opd.r2 = opd->r2;
|
||||
return 1;
|
||||
}
|
||||
|
||||
/* Create stub to jump to function described in this OPD: 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 opdaddr,
|
||||
struct module *me)
|
||||
{
|
||||
struct ppc64_stub_entry *stubs;
|
||||
struct ppc64_opd_entry *opd = (void *)opdaddr;
|
||||
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; stubs[i].opd.funcaddr; i++) {
|
||||
BUG_ON(i >= num_stubs);
|
||||
|
||||
if (stubs[i].opd.funcaddr == opd->funcaddr)
|
||||
return (unsigned long)&stubs[i];
|
||||
}
|
||||
|
||||
if (!create_stub(sechdrs, &stubs[i], opd, 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 != 0x60000000) {
|
||||
printk("%s: Expect noop after relocate, got %08x\n",
|
||||
me->name, *instruction);
|
||||
return 0;
|
||||
}
|
||||
*instruction = 0xe8410028; /* ld r2,40(r1) */
|
||||
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;
|
||||
|
||||
DEBUGP("Applying ADD relocate section %u to %u\n", relsec,
|
||||
sechdrs[relsec].sh_info);
|
||||
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);
|
||||
|
||||
DEBUGP("RELOC at %p: %li-type as %s (%lu) + %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:
|
||||
/* Subtact TOC pointer */
|
||||
value -= my_r2(sechdrs, me);
|
||||
if (value + 0x8000 > 0xffff) {
|
||||
printk("%s: bad TOC16 relocation (%lu)\n",
|
||||
me->name, value);
|
||||
return -ENOEXEC;
|
||||
}
|
||||
*((uint16_t *) location)
|
||||
= (*((uint16_t *) location) & ~0xffff)
|
||||
| (value & 0xffff);
|
||||
break;
|
||||
|
||||
case R_PPC64_TOC16_DS:
|
||||
/* Subtact TOC pointer */
|
||||
value -= my_r2(sechdrs, me);
|
||||
if ((value & 3) != 0 || value + 0x8000 > 0xffff) {
|
||||
printk("%s: bad TOC16_DS relocation (%lu)\n",
|
||||
me->name, value);
|
||||
return -ENOEXEC;
|
||||
}
|
||||
*((uint16_t *) location)
|
||||
= (*((uint16_t *) location) & ~0xfffc)
|
||||
| (value & 0xfffc);
|
||||
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;
|
||||
}
|
||||
|
||||
/* Convert value to relative */
|
||||
value -= (unsigned long)location;
|
||||
if (value + 0x2000000 > 0x3ffffff || (value & 3) != 0){
|
||||
printk("%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;
|
||||
|
||||
default:
|
||||
printk("%s: Unknown ADD relocation: %lu\n",
|
||||
me->name,
|
||||
(unsigned long)ELF64_R_TYPE(rela[i].r_info));
|
||||
return -ENOEXEC;
|
||||
}
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
LIST_HEAD(module_bug_list);
|
||||
|
||||
int module_finalize(const Elf_Ehdr *hdr,
|
||||
const Elf_Shdr *sechdrs, struct module *me)
|
||||
{
|
||||
char *secstrings;
|
||||
unsigned int i;
|
||||
|
||||
me->arch.bug_table = NULL;
|
||||
me->arch.num_bugs = 0;
|
||||
|
||||
/* Find the __bug_table section, if present */
|
||||
secstrings = (char *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
|
||||
for (i = 1; i < hdr->e_shnum; i++) {
|
||||
if (strcmp(secstrings+sechdrs[i].sh_name, "__bug_table"))
|
||||
continue;
|
||||
me->arch.bug_table = (void *) sechdrs[i].sh_addr;
|
||||
me->arch.num_bugs = sechdrs[i].sh_size / sizeof(struct bug_entry);
|
||||
break;
|
||||
}
|
||||
|
||||
/*
|
||||
* Strictly speaking this should have a spinlock to protect against
|
||||
* traversals, but since we only traverse on BUG()s, a spinlock
|
||||
* could potentially lead to deadlock and thus be counter-productive.
|
||||
*/
|
||||
list_add(&me->arch.bug_list, &module_bug_list);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
void module_arch_cleanup(struct module *mod)
|
||||
{
|
||||
list_del(&mod->arch.bug_list);
|
||||
}
|
||||
|
||||
struct bug_entry *module_find_bug(unsigned long bugaddr)
|
||||
{
|
||||
struct mod_arch_specific *mod;
|
||||
unsigned int i;
|
||||
struct bug_entry *bug;
|
||||
|
||||
list_for_each_entry(mod, &module_bug_list, bug_list) {
|
||||
bug = mod->bug_table;
|
||||
for (i = 0; i < mod->num_bugs; ++i, ++bug)
|
||||
if (bugaddr == bug->bug_addr)
|
||||
return bug;
|
||||
}
|
||||
return NULL;
|
||||
}
|
||||
Reference in New Issue
Block a user