![Linus Torvalds](/assets/img/avatar_default.png)
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
823 lines
22 KiB
C
823 lines
22 KiB
C
/* Kernel dynamically loadable module help for PARISC.
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*
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* The best reference for this stuff is probably the Processor-
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* Specific ELF Supplement for PA-RISC:
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* http://ftp.parisc-linux.org/docs/arch/elf-pa-hp.pdf
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*
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* Linux/PA-RISC Project (http://www.parisc-linux.org/)
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* Copyright (C) 2003 Randolph Chung <tausq at debian . org>
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*
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*
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* This program 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 2 of the License, or
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* (at your option) any later version.
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*
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* This program 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 this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*
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* Notes:
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* - SEGREL32 handling
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* We are not doing SEGREL32 handling correctly. According to the ABI, we
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* should do a value offset, like this:
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* if (is_init(me, (void *)val))
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* val -= (uint32_t)me->module_init;
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* else
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* val -= (uint32_t)me->module_core;
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* However, SEGREL32 is used only for PARISC unwind entries, and we want
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* those entries to have an absolute address, and not just an offset.
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*
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* The unwind table mechanism has the ability to specify an offset for
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* the unwind table; however, because we split off the init functions into
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* a different piece of memory, it is not possible to do this using a
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* single offset. Instead, we use the above hack for now.
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*/
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#include <linux/moduleloader.h>
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#include <linux/elf.h>
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#include <linux/vmalloc.h>
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#include <linux/fs.h>
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#include <linux/string.h>
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#include <linux/kernel.h>
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#include <asm/unwind.h>
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#if 0
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#define DEBUGP printk
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#else
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#define DEBUGP(fmt...)
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#endif
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#define CHECK_RELOC(val, bits) \
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if ( ( !((val) & (1<<((bits)-1))) && ((val)>>(bits)) != 0 ) || \
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( ((val) & (1<<((bits)-1))) && ((val)>>(bits)) != (((__typeof__(val))(~0))>>((bits)+2)))) { \
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printk(KERN_ERR "module %s relocation of symbol %s is out of range (0x%lx in %d bits)\n", \
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me->name, strtab + sym->st_name, (unsigned long)val, bits); \
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return -ENOEXEC; \
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}
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/* Maximum number of GOT entries. We use a long displacement ldd from
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* the bottom of the table, which has a maximum signed displacement of
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* 0x3fff; however, since we're only going forward, this becomes
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* 0x1fff, and thus, since each GOT entry is 8 bytes long we can have
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* at most 1023 entries */
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#define MAX_GOTS 1023
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/* three functions to determine where in the module core
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* or init pieces the location is */
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static inline int is_init(struct module *me, void *loc)
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{
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return (loc >= me->module_init &&
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loc <= (me->module_init + me->init_size));
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}
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static inline int is_core(struct module *me, void *loc)
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{
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return (loc >= me->module_core &&
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loc <= (me->module_core + me->core_size));
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}
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static inline int is_local(struct module *me, void *loc)
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{
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return is_init(me, loc) || is_core(me, loc);
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}
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#ifndef __LP64__
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struct got_entry {
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Elf32_Addr addr;
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};
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#define Elf_Fdesc Elf32_Fdesc
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struct stub_entry {
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Elf32_Word insns[2]; /* each stub entry has two insns */
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};
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#else
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struct got_entry {
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Elf64_Addr addr;
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};
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#define Elf_Fdesc Elf64_Fdesc
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struct stub_entry {
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Elf64_Word insns[4]; /* each stub entry has four insns */
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};
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#endif
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/* Field selection types defined by hppa */
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#define rnd(x) (((x)+0x1000)&~0x1fff)
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/* fsel: full 32 bits */
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#define fsel(v,a) ((v)+(a))
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/* lsel: select left 21 bits */
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#define lsel(v,a) (((v)+(a))>>11)
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/* rsel: select right 11 bits */
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#define rsel(v,a) (((v)+(a))&0x7ff)
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/* lrsel with rounding of addend to nearest 8k */
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#define lrsel(v,a) (((v)+rnd(a))>>11)
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/* rrsel with rounding of addend to nearest 8k */
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#define rrsel(v,a) ((((v)+rnd(a))&0x7ff)+((a)-rnd(a)))
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#define mask(x,sz) ((x) & ~((1<<(sz))-1))
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/* The reassemble_* functions prepare an immediate value for
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insertion into an opcode. pa-risc uses all sorts of weird bitfields
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in the instruction to hold the value. */
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static inline int reassemble_14(int as14)
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{
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return (((as14 & 0x1fff) << 1) |
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((as14 & 0x2000) >> 13));
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}
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static inline int reassemble_17(int as17)
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{
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return (((as17 & 0x10000) >> 16) |
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((as17 & 0x0f800) << 5) |
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((as17 & 0x00400) >> 8) |
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((as17 & 0x003ff) << 3));
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}
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static inline int reassemble_21(int as21)
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{
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return (((as21 & 0x100000) >> 20) |
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((as21 & 0x0ffe00) >> 8) |
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((as21 & 0x000180) << 7) |
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((as21 & 0x00007c) << 14) |
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((as21 & 0x000003) << 12));
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}
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static inline int reassemble_22(int as22)
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{
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return (((as22 & 0x200000) >> 21) |
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((as22 & 0x1f0000) << 5) |
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((as22 & 0x00f800) << 5) |
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((as22 & 0x000400) >> 8) |
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((as22 & 0x0003ff) << 3));
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}
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void *module_alloc(unsigned long size)
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{
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if (size == 0)
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return NULL;
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return vmalloc(size);
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}
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#ifndef __LP64__
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static inline unsigned long count_gots(const Elf_Rela *rela, unsigned long n)
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{
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return 0;
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}
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static inline unsigned long count_fdescs(const Elf_Rela *rela, unsigned long n)
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{
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return 0;
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}
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static inline unsigned long count_stubs(const Elf_Rela *rela, unsigned long n)
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{
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unsigned long cnt = 0;
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for (; n > 0; n--, rela++)
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{
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switch (ELF32_R_TYPE(rela->r_info)) {
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case R_PARISC_PCREL17F:
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case R_PARISC_PCREL22F:
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cnt++;
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}
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}
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return cnt;
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}
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#else
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static inline unsigned long count_gots(const Elf_Rela *rela, unsigned long n)
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{
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unsigned long cnt = 0;
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for (; n > 0; n--, rela++)
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{
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switch (ELF64_R_TYPE(rela->r_info)) {
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case R_PARISC_LTOFF21L:
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case R_PARISC_LTOFF14R:
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case R_PARISC_PCREL22F:
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cnt++;
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}
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}
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return cnt;
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}
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static inline unsigned long count_fdescs(const Elf_Rela *rela, unsigned long n)
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{
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unsigned long cnt = 0;
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for (; n > 0; n--, rela++)
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{
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switch (ELF64_R_TYPE(rela->r_info)) {
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case R_PARISC_FPTR64:
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cnt++;
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}
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}
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return cnt;
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}
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static inline unsigned long count_stubs(const Elf_Rela *rela, unsigned long n)
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{
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unsigned long cnt = 0;
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for (; n > 0; n--, rela++)
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{
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switch (ELF64_R_TYPE(rela->r_info)) {
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case R_PARISC_PCREL22F:
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cnt++;
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}
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}
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return cnt;
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}
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#endif
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/* Free memory returned from module_alloc */
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void module_free(struct module *mod, void *module_region)
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{
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vfree(module_region);
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/* FIXME: If module_region == mod->init_region, trim exception
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table entries. */
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}
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#define CONST
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int module_frob_arch_sections(CONST Elf_Ehdr *hdr,
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CONST Elf_Shdr *sechdrs,
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CONST char *secstrings,
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struct module *me)
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{
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unsigned long gots = 0, fdescs = 0, stubs = 0, init_stubs = 0;
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unsigned int i;
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for (i = 1; i < hdr->e_shnum; i++) {
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const Elf_Rela *rels = (void *)hdr + sechdrs[i].sh_offset;
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unsigned long nrels = sechdrs[i].sh_size / sizeof(*rels);
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if (strncmp(secstrings + sechdrs[i].sh_name,
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".PARISC.unwind", 14) == 0)
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me->arch.unwind_section = i;
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if (sechdrs[i].sh_type != SHT_RELA)
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continue;
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/* some of these are not relevant for 32-bit/64-bit
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* we leave them here to make the code common. the
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* compiler will do its thing and optimize out the
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* stuff we don't need
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*/
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gots += count_gots(rels, nrels);
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fdescs += count_fdescs(rels, nrels);
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if(strncmp(secstrings + sechdrs[i].sh_name,
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".rela.init", 10) == 0)
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init_stubs += count_stubs(rels, nrels);
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else
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stubs += count_stubs(rels, nrels);
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}
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/* align things a bit */
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me->core_size = ALIGN(me->core_size, 16);
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me->arch.got_offset = me->core_size;
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me->core_size += gots * sizeof(struct got_entry);
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me->core_size = ALIGN(me->core_size, 16);
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me->arch.fdesc_offset = me->core_size;
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me->core_size += fdescs * sizeof(Elf_Fdesc);
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me->core_size = ALIGN(me->core_size, 16);
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me->arch.stub_offset = me->core_size;
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me->core_size += stubs * sizeof(struct stub_entry);
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me->init_size = ALIGN(me->init_size, 16);
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me->arch.init_stub_offset = me->init_size;
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me->init_size += init_stubs * sizeof(struct stub_entry);
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me->arch.got_max = gots;
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me->arch.fdesc_max = fdescs;
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me->arch.stub_max = stubs;
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me->arch.init_stub_max = init_stubs;
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return 0;
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}
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#ifdef __LP64__
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static Elf64_Word get_got(struct module *me, unsigned long value, long addend)
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{
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unsigned int i;
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struct got_entry *got;
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value += addend;
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BUG_ON(value == 0);
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got = me->module_core + me->arch.got_offset;
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for (i = 0; got[i].addr; i++)
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if (got[i].addr == value)
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goto out;
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BUG_ON(++me->arch.got_count > me->arch.got_max);
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got[i].addr = value;
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out:
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DEBUGP("GOT ENTRY %d[%x] val %lx\n", i, i*sizeof(struct got_entry),
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value);
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return i * sizeof(struct got_entry);
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}
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#endif /* __LP64__ */
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#ifdef __LP64__
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static Elf_Addr get_fdesc(struct module *me, unsigned long value)
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{
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Elf_Fdesc *fdesc = me->module_core + me->arch.fdesc_offset;
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if (!value) {
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printk(KERN_ERR "%s: zero OPD requested!\n", me->name);
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return 0;
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}
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/* Look for existing fdesc entry. */
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while (fdesc->addr) {
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if (fdesc->addr == value)
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return (Elf_Addr)fdesc;
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fdesc++;
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}
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BUG_ON(++me->arch.fdesc_count > me->arch.fdesc_max);
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/* Create new one */
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fdesc->addr = value;
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fdesc->gp = (Elf_Addr)me->module_core + me->arch.got_offset;
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return (Elf_Addr)fdesc;
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}
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#endif /* __LP64__ */
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static Elf_Addr get_stub(struct module *me, unsigned long value, long addend,
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int millicode, int init_section)
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{
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unsigned long i;
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struct stub_entry *stub;
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if(init_section) {
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i = me->arch.init_stub_count++;
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BUG_ON(me->arch.init_stub_count > me->arch.init_stub_max);
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stub = me->module_init + me->arch.init_stub_offset +
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i * sizeof(struct stub_entry);
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} else {
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i = me->arch.stub_count++;
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BUG_ON(me->arch.stub_count > me->arch.stub_max);
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stub = me->module_core + me->arch.stub_offset +
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i * sizeof(struct stub_entry);
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}
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#ifndef __LP64__
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/* for 32-bit the stub looks like this:
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* ldil L'XXX,%r1
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* be,n R'XXX(%sr4,%r1)
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*/
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//value = *(unsigned long *)((value + addend) & ~3); /* why? */
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stub->insns[0] = 0x20200000; /* ldil L'XXX,%r1 */
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stub->insns[1] = 0xe0202002; /* be,n R'XXX(%sr4,%r1) */
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stub->insns[0] |= reassemble_21(lrsel(value, addend));
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stub->insns[1] |= reassemble_17(rrsel(value, addend) / 4);
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#else
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/* for 64-bit we have two kinds of stubs:
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* for normal function calls:
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* ldd 0(%dp),%dp
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* ldd 10(%dp), %r1
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* bve (%r1)
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* ldd 18(%dp), %dp
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*
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* for millicode:
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* ldil 0, %r1
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* ldo 0(%r1), %r1
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* ldd 10(%r1), %r1
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* bve,n (%r1)
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*/
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if (!millicode)
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{
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stub->insns[0] = 0x537b0000; /* ldd 0(%dp),%dp */
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stub->insns[1] = 0x53610020; /* ldd 10(%dp),%r1 */
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stub->insns[2] = 0xe820d000; /* bve (%r1) */
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stub->insns[3] = 0x537b0030; /* ldd 18(%dp),%dp */
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stub->insns[0] |= reassemble_14(get_got(me, value, addend) & 0x3fff);
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}
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else
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{
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stub->insns[0] = 0x20200000; /* ldil 0,%r1 */
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stub->insns[1] = 0x34210000; /* ldo 0(%r1), %r1 */
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stub->insns[2] = 0x50210020; /* ldd 10(%r1),%r1 */
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stub->insns[3] = 0xe820d002; /* bve,n (%r1) */
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stub->insns[0] |= reassemble_21(lrsel(value, addend));
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stub->insns[1] |= reassemble_14(rrsel(value, addend));
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}
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#endif
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return (Elf_Addr)stub;
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}
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|
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int apply_relocate(Elf_Shdr *sechdrs,
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const char *strtab,
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unsigned int symindex,
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unsigned int relsec,
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struct module *me)
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{
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/* parisc should not need this ... */
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printk(KERN_ERR "module %s: RELOCATION unsupported\n",
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me->name);
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return -ENOEXEC;
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}
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|
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#ifndef __LP64__
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int apply_relocate_add(Elf_Shdr *sechdrs,
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const char *strtab,
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unsigned int symindex,
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unsigned int relsec,
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struct module *me)
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{
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int i;
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Elf32_Rela *rel = (void *)sechdrs[relsec].sh_addr;
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Elf32_Sym *sym;
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Elf32_Word *loc;
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Elf32_Addr val;
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Elf32_Sword addend;
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Elf32_Addr dot;
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//unsigned long dp = (unsigned long)$global$;
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register unsigned long dp asm ("r27");
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DEBUGP("Applying relocate section %u to %u\n", relsec,
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sechdrs[relsec].sh_info);
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for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
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/* This is where to make the change */
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loc = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr
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+ rel[i].r_offset;
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/* This is the symbol it is referring to */
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sym = (Elf32_Sym *)sechdrs[symindex].sh_addr
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+ ELF32_R_SYM(rel[i].r_info);
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if (!sym->st_value) {
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printk(KERN_WARNING "%s: Unknown symbol %s\n",
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me->name, strtab + sym->st_name);
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return -ENOENT;
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}
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//dot = (sechdrs[relsec].sh_addr + rel->r_offset) & ~0x03;
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dot = (Elf32_Addr)loc & ~0x03;
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val = sym->st_value;
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addend = rel[i].r_addend;
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#if 0
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#define r(t) ELF32_R_TYPE(rel[i].r_info)==t ? #t :
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DEBUGP("Symbol %s loc 0x%x val 0x%x addend 0x%x: %s\n",
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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 */
|
|
val = get_stub(me, val, addend, 0, is_init(me, loc));
|
|
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 */
|
|
val = get_stub(me, val, addend, 0, is_init(me, loc));
|
|
DEBUGP("STUB FOR %s loc %lx+%lx at %lx\n",
|
|
strtab + sym->st_name, (unsigned long)loc, addend,
|
|
val)
|
|
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;
|
|
|
|
DEBUGP("Applying relocate section %u to %u\n", relsec,
|
|
sechdrs[relsec].sh_info);
|
|
for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
|
|
/* This is where to make the change */
|
|
loc = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr
|
|
+ rel[i].r_offset;
|
|
/* 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);
|
|
/* can we reach it locally? */
|
|
if(!is_local(me, (void *)val)) {
|
|
if (strncmp(strtab + sym->st_name, "$$", 2)
|
|
== 0)
|
|
val = get_stub(me, val, addend, 1,
|
|
is_init(me, loc));
|
|
else
|
|
val = get_stub(me, val, addend, 0,
|
|
is_init(me, loc));
|
|
}
|
|
DEBUGP("STUB FOR %s loc %lx, val %lx+%lx at %lx\n",
|
|
strtab + sym->st_name, loc, sym->st_value,
|
|
addend, val);
|
|
/* FIXME: local symbols work as long as the
|
|
* core and init pieces aren't separated too
|
|
* far. If this is ever broken, you will trip
|
|
* the check below. The way to fix it would
|
|
* be to generate local stubs to go between init
|
|
* and core */
|
|
if((Elf64_Sxword)(val - dot - 8) > 0x800000 -1 ||
|
|
(Elf64_Sxword)(val - dot - 8) < -0x800000) {
|
|
printk(KERN_ERR "Module %s, symbol %s is out of range for PCREL22F relocation\n",
|
|
me->name, strtab + sym->st_name);
|
|
return -ENOEXEC;
|
|
}
|
|
val = (val - dot - 8)/4;
|
|
*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(is_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("stubs used %ld, stubs max %ld\n"
|
|
"init_stubs used %ld, init stubs max %ld\n"
|
|
"got entries used %ld, gots max %ld\n"
|
|
"fdescs used %ld, fdescs max %ld\n",
|
|
me->arch.stub_count, me->arch.stub_max,
|
|
me->arch.init_stub_count, me->arch.init_stub_max,
|
|
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_type & 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;
|
|
}
|
|
|
|
/* 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);
|
|
}
|