973 lines
26 KiB
C
973 lines
26 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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* Copyright (C) 2008 Helge Deller <deller@gmx.de>
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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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* - PLT stub handling
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* On 32bit (and sometimes 64bit) and with big kernel modules like xfs or
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* ipv6 the relocation types R_PARISC_PCREL17F and R_PARISC_PCREL22F may
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* fail to reach their PLT stub if we only create one big stub array for
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* all sections at the beginning of the core or init section.
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* Instead we now insert individual PLT stub entries directly in front of
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* of the code sections where the stubs are actually called.
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* This reduces the distance between the PCREL location and the stub entry
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* so that the relocations can be fulfilled.
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* While calculating the final layout of the kernel module in memory, the
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* kernel module loader calls arch_mod_section_prepend() to request the
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* to be reserved amount of memory in front of each individual section.
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*
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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 (in_init(me, (void *)val))
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* val -= (uint32_t)me->init_layout.base;
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* else
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* val -= (uint32_t)me->core_layout.base;
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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 <linux/bug.h>
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#include <linux/mm.h>
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#include <linux/slab.h>
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#include <asm/pgtable.h>
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#include <asm/unwind.h>
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#include <asm/sections.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 RELOC_REACHABLE(val, bits) \
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(( ( !((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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0 : 1)
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#define CHECK_RELOC(val, bits) \
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if (!RELOC_REACHABLE(val, bits)) { \
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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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* To overcome this 14bit displacement with some kernel modules, we'll
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* use instead the unusal 16bit displacement method (see reassemble_16a)
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* which gives us a maximum positive displacement of 0x7fff, and as such
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* allows us to allocate up to 4095 GOT entries. */
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#define MAX_GOTS 4095
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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 in_init(struct module *me, void *loc)
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{
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return (loc >= me->init_layout.base &&
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loc <= (me->init_layout.base + me->init_layout.size));
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}
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static inline int in_core(struct module *me, void *loc)
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{
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return (loc >= me->core_layout.base &&
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loc <= (me->core_layout.base + me->core_layout.size));
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}
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static inline int in_local(struct module *me, void *loc)
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{
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return in_init(me, loc) || in_core(me, loc);
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}
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#ifndef CONFIG_64BIT
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struct got_entry {
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Elf32_Addr addr;
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};
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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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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 sign_unext(int x, int len)
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{
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int len_ones;
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len_ones = (1 << len) - 1;
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return x & len_ones;
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}
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static inline int low_sign_unext(int x, int len)
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{
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int sign, temp;
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sign = (x >> (len-1)) & 1;
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temp = sign_unext(x, len-1);
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return (temp << 1) | sign;
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}
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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_16a(int as16)
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{
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int s, t;
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/* Unusual 16-bit encoding, for wide mode only. */
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t = (as16 << 1) & 0xffff;
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s = (as16 & 0x8000);
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return (t ^ s ^ (s >> 1)) | (s >> 15);
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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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/* using RWX means less protection for modules, but it's
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* easier than trying to map the text, data, init_text and
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* init_data correctly */
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return __vmalloc_node_range(size, 1, VMALLOC_START, VMALLOC_END,
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GFP_KERNEL,
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PAGE_KERNEL_RWX, 0, NUMA_NO_NODE,
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__builtin_return_address(0));
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}
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#ifndef CONFIG_64BIT
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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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void module_arch_freeing_init(struct module *mod)
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{
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kfree(mod->arch.section);
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mod->arch.section = NULL;
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}
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/* Additional bytes needed in front of individual sections */
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unsigned int arch_mod_section_prepend(struct module *mod,
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unsigned int section)
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{
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/* size needed for all stubs of this section (including
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* one additional for correct alignment of the stubs) */
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return (mod->arch.section[section].stub_entries + 1)
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* sizeof(struct stub_entry);
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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, len;
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unsigned int i;
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len = hdr->e_shnum * sizeof(me->arch.section[0]);
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me->arch.section = kzalloc(len, GFP_KERNEL);
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if (!me->arch.section)
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return -ENOMEM;
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for (i = 1; i < hdr->e_shnum; i++) {
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const Elf_Rela *rels = (void *)sechdrs[i].sh_addr;
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unsigned long nrels = sechdrs[i].sh_size / sizeof(*rels);
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unsigned int count, s;
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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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/* XXX: By sorting the relocs and finding duplicate entries
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* we could reduce the number of necessary stubs and save
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* some memory. */
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count = count_stubs(rels, nrels);
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if (!count)
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continue;
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/* so we need relocation stubs. reserve necessary memory. */
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/* sh_info gives the section for which we need to add stubs. */
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s = sechdrs[i].sh_info;
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/* each code section should only have one relocation section */
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WARN_ON(me->arch.section[s].stub_entries);
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/* store number of stubs we need for this section */
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me->arch.section[s].stub_entries += count;
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}
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/* align things a bit */
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me->core_layout.size = ALIGN(me->core_layout.size, 16);
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me->arch.got_offset = me->core_layout.size;
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me->core_layout.size += gots * sizeof(struct got_entry);
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me->core_layout.size = ALIGN(me->core_layout.size, 16);
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me->arch.fdesc_offset = me->core_layout.size;
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me->core_layout.size += fdescs * sizeof(Elf_Fdesc);
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me->arch.got_max = gots;
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me->arch.fdesc_max = fdescs;
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return 0;
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}
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#ifdef CONFIG_64BIT
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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->core_layout.base + 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 /* CONFIG_64BIT */
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#ifdef CONFIG_64BIT
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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->core_layout.base + 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->core_layout.base + me->arch.got_offset;
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return (Elf_Addr)fdesc;
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}
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#endif /* CONFIG_64BIT */
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enum elf_stub_type {
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ELF_STUB_GOT,
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ELF_STUB_MILLI,
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ELF_STUB_DIRECT,
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};
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static Elf_Addr get_stub(struct module *me, unsigned long value, long addend,
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enum elf_stub_type stub_type, Elf_Addr loc0, unsigned int targetsec)
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{
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struct stub_entry *stub;
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int __maybe_unused d;
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/* initialize stub_offset to point in front of the section */
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if (!me->arch.section[targetsec].stub_offset) {
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loc0 -= (me->arch.section[targetsec].stub_entries + 1) *
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sizeof(struct stub_entry);
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/* get correct alignment for the stubs */
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loc0 = ALIGN(loc0, sizeof(struct stub_entry));
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me->arch.section[targetsec].stub_offset = loc0;
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}
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/* get address of stub entry */
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stub = (void *) me->arch.section[targetsec].stub_offset;
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me->arch.section[targetsec].stub_offset += sizeof(struct stub_entry);
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/* do not write outside available stub area */
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BUG_ON(0 == me->arch.section[targetsec].stub_entries--);
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|
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#ifndef CONFIG_64BIT
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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 three 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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* for direct branches (jumps between different section of the
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|
* same module):
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* ldil 0, %r1
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* ldo 0(%r1), %r1
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* bve,n (%r1)
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*/
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switch (stub_type) {
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case ELF_STUB_GOT:
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d = get_got(me, value, addend);
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if (d <= 15) {
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/* 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_SECREL32:
|
|
/* 32-bit section relative address. */
|
|
*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;
|
|
case R_PARISC_PCREL32:
|
|
/* 32-bit PC relative address */
|
|
*loc = val - dot - 8 + addend;
|
|
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_PCREL32:
|
|
/* 32-bit PC relative address */
|
|
*loc = val - dot - 8 + addend;
|
|
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_SECREL32:
|
|
/* 32-bit section relative address. */
|
|
*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->core_layout.base + 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);
|
|
}
|
|
|
|
#ifdef CONFIG_64BIT
|
|
void *dereference_module_function_descriptor(struct module *mod, void *ptr)
|
|
{
|
|
unsigned long start_opd = (Elf64_Addr)mod->core_layout.base +
|
|
mod->arch.fdesc_offset;
|
|
unsigned long end_opd = start_opd +
|
|
mod->arch.fdesc_count * sizeof(Elf64_Fdesc);
|
|
|
|
if (ptr < (void *)start_opd || ptr >= (void *)end_opd)
|
|
return ptr;
|
|
|
|
return dereference_function_descriptor(ptr);
|
|
}
|
|
#endif
|