74444a2ddb
and push the outer loop into it. This actually shaves a couple % off startup time at least on PCs.
262 lines
6.8 KiB
C
262 lines
6.8 KiB
C
/* $NetBSD: ppc_reloc.c,v 1.14 2002/09/05 20:08:18 mycroft Exp $ */
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/*-
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* Copyright (C) 1998 Tsubai Masanari
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <stdarg.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <machine/cpu.h>
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#include "debug.h"
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#include "rtld.h"
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caddr_t _rtld_bind_powerpc __P((Obj_Entry *, Elf_Word));
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void _rtld_powerpc_pltcall __P((Elf_Word));
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void _rtld_powerpc_pltresolve __P((Elf_Word, Elf_Word));
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#define ha(x) ((((u_int32_t)(x) & 0x8000) ? \
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((u_int32_t)(x) + 0x10000) : (u_int32_t)(x)) >> 16)
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#define l(x) ((u_int32_t)(x) & 0xffff)
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/*
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* Bind a pltgot slot indexed by reloff.
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*/
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caddr_t
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_rtld_bind_powerpc(obj, reloff)
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Obj_Entry *obj;
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Elf_Word reloff;
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{
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const Elf_Rela *rela;
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caddr_t addr;
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if (reloff < 0 || reloff >= 0x8000) {
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dbg(("_rtld_bind_powerpc: broken reloff %x", reloff));
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_rtld_die();
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}
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rela = obj->pltrela + reloff;
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if (_rtld_relocate_plt_object(obj, rela, &addr, true, true) < 0)
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_rtld_die();
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return addr;
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}
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/*
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* Make a pltgot slot.
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* Initial value is "pltresolve" unless bind_now is true.
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*/
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int
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_rtld_relocate_plt_object(
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Obj_Entry *obj,
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const Elf_Rela *rela,
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caddr_t *addrp,
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bool bind_now,
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bool dodebug)
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{
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Elf_Word *where = (Elf_Word *)(obj->relocbase + rela->r_offset);
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int distance;
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if (bind_now) {
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const Elf_Sym *def;
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const Obj_Entry *defobj;
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Elf_Addr value;
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assert(ELF_R_TYPE(rela->r_info) == R_TYPE(JMP_SLOT));
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def = _rtld_find_symdef(rela->r_info, obj, &defobj, true);
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if (def == NULL)
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return (-1);
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value = (Elf_Addr)(defobj->relocbase + def->st_value);
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distance = value - (Elf_Addr)where;
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if (abs(distance) < 32*1024*1024) { /* inside 32MB? */
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/* b value # branch directly */
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*where = 0x48000000 | (distance & 0x03fffffc);
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__syncicache(where, 4);
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} else {
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Elf_Addr *pltcall, *jmptab;
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int N = obj->pltrelalim - obj->pltrela;
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int reloff = rela - obj->pltrela;
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if (reloff < 0 || reloff >= 0x8000)
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return (-1);
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pltcall = obj->pltgot;
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jmptab = pltcall + 18 + N * 2;
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jmptab[reloff] = value;
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distance = (Elf_Addr)pltcall - (Elf_Addr)(where + 1);
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/* li r11,reloff */
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/* b pltcall # use pltcall routine */
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where[0] = 0x39600000 | reloff;
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where[1] = 0x48000000 | (distance & 0x03fffffc);
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__syncicache(where, 8);
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}
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if (addrp != NULL)
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*addrp = (caddr_t)value;
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return (0);
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} else {
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Elf_Addr *pltresolve;
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int reloff = rela - obj->pltrela;
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if (reloff < 0 || reloff >= 0x8000)
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return (-1);
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pltresolve = obj->pltgot + 8;
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distance = (Elf_Addr)pltresolve - (Elf_Addr)(where + 1);
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/* li r11,reloff */
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/* b pltresolve */
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where[0] = 0x39600000 | reloff;
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where[1] = 0x48000000 | (distance & 0x03fffffc);
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/* __syncicache(where, 8); */
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}
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return 0;
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}
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/*
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* Setup the plt glue routines.
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*/
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#define PLTCALL_SIZE 20
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#define PLTRESOLVE_SIZE 24
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void
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_rtld_setup_pltgot(obj)
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const Obj_Entry *obj;
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{
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Elf_Word *pltcall, *pltresolve;
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Elf_Word *jmptab;
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int N = obj->pltrelalim - obj->pltrela;
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pltcall = obj->pltgot;
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memcpy(pltcall, _rtld_powerpc_pltcall, PLTCALL_SIZE);
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jmptab = pltcall + 18 + N * 2;
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pltcall[1] |= ha(jmptab);
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pltcall[2] |= l(jmptab);
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pltresolve = obj->pltgot + 8;
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memcpy(pltresolve, _rtld_powerpc_pltresolve, PLTRESOLVE_SIZE);
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pltresolve[0] |= ha(_rtld_bind_start);
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pltresolve[1] |= l(_rtld_bind_start);
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pltresolve[3] |= ha(obj);
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pltresolve[4] |= l(obj);
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__syncicache(pltcall, 72 + N * 8);
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}
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int
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_rtld_relocate_nonplt_objects(obj, dodebug)
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Obj_Entry *obj;
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bool dodebug;
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{
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const Elf_Rela *rela;
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for (rela = obj->rela; rela < obj->relalim; rela++) {
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Elf_Addr *where;
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const Elf_Sym *def;
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const Obj_Entry *defobj;
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Elf_Addr tmp;
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where = (Elf_Addr *)(obj->relocbase + rela->r_offset);
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switch (ELF_R_TYPE(rela->r_info)) {
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case R_TYPE(NONE):
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break;
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case R_TYPE(32): /* word32 S + A */
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case R_TYPE(GLOB_DAT): /* word32 S + A */
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def = _rtld_find_symdef(rela->r_info, obj, &defobj,
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false);
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if (def == NULL)
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return -1;
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tmp = (Elf_Addr)(defobj->relocbase + def->st_value +
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rela->r_addend);
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if (*where != tmp)
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*where = tmp;
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rdbg(dodebug, ("32/GLOB_DAT %s in %s --> %p in %s",
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defobj->strtab + def->st_name, obj->path,
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(void *)*where, defobj->path));
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break;
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case R_TYPE(RELATIVE): /* word32 B + A */
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tmp = (Elf_Addr)(obj->relocbase + rela->r_addend);
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if (*where != tmp)
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*where = tmp;
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rdbg(dodebug, ("RELATIVE in %s --> %p", obj->path,
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(void *)*where));
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break;
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case R_TYPE(COPY):
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/*
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* These are deferred until all other relocations have
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* been done. All we do here is make sure that the
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* COPY relocation is not in a shared library. They
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* are allowed only in executable files.
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*/
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if (!obj->mainprog) {
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_rtld_error(
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"%s: Unexpected R_COPY relocation in shared library",
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obj->path);
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return -1;
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}
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rdbg(dodebug, ("COPY (avoid in main)"));
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break;
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default:
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def = _rtld_find_symdef(rela->r_info, obj, &defobj,
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true);
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rdbg(dodebug, ("sym = %lu, type = %lu, offset = %p, "
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"addend = %p, contents = %p, symbol = %s",
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(u_long)ELF_R_SYM(rela->r_info),
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(u_long)ELF_R_TYPE(rela->r_info),
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(void *)rela->r_offset, (void *)rela->r_addend,
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(void *)*where,
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def ? defobj->strtab + def->st_name : "??"));
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_rtld_error("%s: Unsupported relocation type %ld "
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"in non-PLT relocations\n",
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obj->path, (u_long) ELF_R_TYPE(rela->r_info));
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return -1;
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}
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}
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return 0;
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}
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