ld-elf.so.1 assumed a few too many things about the ordering of sections
produced by ld(8) (ie: that _DYNAMIC immediately follows the _GOT). The new binutils import changed that, and the intial GOT relocation broke. Use a custom linker script to provide a real end-of-GOT symbol. Update ld.so to deal with the new (faster) PLT format that gcc-3.1 and binutils can produce. This is probably incomplete, but appears to be working again. Obtained from: NetBSD (And a fix to a silly mistake that I made by: gallatin)
This commit is contained in:
Peter Wemm
parent
39e37e7212
commit
939bc65715
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=90826
@ -1 +1,4 @@
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# $FreeBSD$
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CFLAGS+= -mno-fp-regs
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LDFLAGS+= -Wl,--script,${.CURDIR}/alpha/ld.so.script
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135
libexec/rtld-elf/alpha/ld.so.script
Normal file
135
libexec/rtld-elf/alpha/ld.so.script
Normal file
@ -0,0 +1,135 @@
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/* $NetBSD: ld.so.script,v 1.2 2001/12/13 20:31:31 thorpej Exp $ */
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/* $FreeBSD$ */
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OUTPUT_FORMAT("elf64-alpha", "elf64-alpha",
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"elf64-alpha")
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OUTPUT_ARCH(alpha)
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ENTRY(__start)
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/* SEARCH_DIR(/usr/lib); JRT */
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/* Do we need any of these for elf?
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__DYNAMIC = 0; */
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SECTIONS
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||||
{
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||||
/* Read-only sections, merged into text segment: */
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||||
. = 0 + SIZEOF_HEADERS;
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||||
.hash : { *(.hash) }
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||||
.dynsym : { *(.dynsym) }
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||||
.dynstr : { *(.dynstr) }
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||||
.gnu.version : { *(.gnu.version) }
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.gnu.version_d : { *(.gnu.version_d) }
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||||
.gnu.version_r : { *(.gnu.version_r) }
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||||
.rel.text :
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{ *(.rel.text) *(.rel.gnu.linkonce.t*) }
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.rela.text :
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||||
{ *(.rela.text) *(.rela.gnu.linkonce.t*) }
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.rel.data :
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{ *(.rel.data) *(.rel.gnu.linkonce.d*) }
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.rela.data :
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{ *(.rela.data) *(.rela.gnu.linkonce.d*) }
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.rel.rodata :
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{ *(.rel.rodata) *(.rel.gnu.linkonce.r*) }
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.rela.rodata :
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{ *(.rela.rodata) *(.rela.gnu.linkonce.r*) }
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.rel.got : { *(.rel.got) }
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.rela.got : { *(.rela.got) }
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.rel.ctors : { *(.rel.ctors) }
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.rela.ctors : { *(.rela.ctors) }
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.rel.dtors : { *(.rel.dtors) }
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.rela.dtors : { *(.rela.dtors) }
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.rel.init : { *(.rel.init) }
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.rela.init : { *(.rela.init) }
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.rel.fini : { *(.rel.fini) }
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.rela.fini : { *(.rela.fini) }
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.rel.bss : { *(.rel.bss) }
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.rela.bss : { *(.rela.bss) }
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.rel.plt : { *(.rel.plt) }
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.rela.plt : { *(.rela.plt) }
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.init : { *(.init) } =0x47ff041f
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.text :
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{
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*(.text)
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*(.stub)
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/* .gnu.warning sections are handled specially by elf32.em. */
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*(.gnu.warning)
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*(.gnu.linkonce.t*)
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} =0x47ff041f
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_etext = .;
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PROVIDE (etext = .);
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.fini : { *(.fini) } =0x47ff041f
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.rodata : { *(.rodata) *(.gnu.linkonce.r*) }
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.rodata1 : { *(.rodata1) }
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.reginfo : { *(.reginfo) }
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/* Adjust the address for the data segment. We want to adjust up to
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the same address within the page on the next page up. */
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. = ALIGN(0x100000) + (. & (0x100000 - 1));
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.data :
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{
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*(.data)
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*(.gnu.linkonce.d*)
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CONSTRUCTORS
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}
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.data1 : { *(.data1) }
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.ctors :
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{
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*(.ctors)
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}
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.dtors :
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{
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*(.dtors)
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}
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.plt : { *(.plt) }
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.got : { *(.got.plt) *(.got) }
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PROVIDE (_GOT_END_ = .);
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.dynamic : { *(.dynamic) }
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/* We want the small data sections together, so single-instruction offsets
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can access them all, and initialized data all before uninitialized, so
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we can shorten the on-disk segment size. */
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.sdata : { *(.sdata) }
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_edata = .;
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PROVIDE (edata = .);
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__bss_start = .;
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.sbss : { *(.sbss) *(.scommon) }
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.bss :
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{
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*(.dynbss)
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*(.bss)
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*(COMMON)
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}
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. = ALIGN(64 / 8);
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_end = . ;
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PROVIDE (end = .);
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/* Stabs debugging sections. */
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.stab 0 : { *(.stab) }
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.stabstr 0 : { *(.stabstr) }
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.stab.excl 0 : { *(.stab.excl) }
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.stab.exclstr 0 : { *(.stab.exclstr) }
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.stab.index 0 : { *(.stab.index) }
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.stab.indexstr 0 : { *(.stab.indexstr) }
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.comment 0 : { *(.comment) }
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/* DWARF debug sections.
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Symbols in the DWARF debugging sections are relative to the beginning
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of the section so we begin them at 0. */
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/* DWARF 1 */
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.debug 0 : { *(.debug) }
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.line 0 : { *(.line) }
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/* GNU DWARF 1 extensions */
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.debug_srcinfo 0 : { *(.debug_srcinfo) }
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.debug_sfnames 0 : { *(.debug_sfnames) }
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/* DWARF 1.1 and DWARF 2 */
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.debug_aranges 0 : { *(.debug_aranges) }
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.debug_pubnames 0 : { *(.debug_pubnames) }
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/* DWARF 2 */
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.debug_info 0 : { *(.debug_info) }
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.debug_abbrev 0 : { *(.debug_abbrev) }
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.debug_line 0 : { *(.debug_line) }
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.debug_frame 0 : { *(.debug_frame) }
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.debug_str 0 : { *(.debug_str) }
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.debug_loc 0 : { *(.debug_loc) }
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.debug_macinfo 0 : { *(.debug_macinfo) }
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/* SGI/MIPS DWARF 2 extensions */
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.debug_weaknames 0 : { *(.debug_weaknames) }
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.debug_funcnames 0 : { *(.debug_funcnames) }
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.debug_typenames 0 : { *(.debug_typenames) }
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.debug_varnames 0 : { *(.debug_varnames) }
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/* These must appear regardless of . */
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}
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@ -47,7 +47,7 @@
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#include "debug.h"
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#include "rtld.h"
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extern Elf_Dyn _DYNAMIC;
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extern Elf_Dyn _GOT_END_;
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/*
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* Macros for loading/storing unaligned 64-bit values. These are
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@ -111,7 +111,7 @@ reloc_non_plt_obj(Obj_Entry *obj_rtld, Obj_Entry *obj, const Elf_Rela *rela,
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case R_ALPHA_RELATIVE: {
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if (obj != obj_rtld ||
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(caddr_t)where < (caddr_t)_GLOBAL_OFFSET_TABLE_ ||
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(caddr_t)where >= (caddr_t)&_DYNAMIC)
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(caddr_t)where >= (caddr_t)&_GOT_END_)
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store64(where,
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load64(where) + (Elf_Addr) obj->relocbase);
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}
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@ -476,10 +476,20 @@ do_copy_relocations(Obj_Entry *dstobj)
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void
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init_pltgot(Obj_Entry *obj)
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{
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u_int32_t *pltgot;
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if (obj->pltgot != NULL &&
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(obj->pltrelsize != 0 || obj->pltrelasize != 0)) {
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/* This function will be called to perform the relocation. */
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obj->pltgot[2] = (Elf_Addr) &_rtld_bind_start;
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/*
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* This function will be called to perform the relocation.
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* Look for the ldah instruction from the old PLT format since
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* that will tell us what format we are trying to relocate.
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*/
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pltgot = (u_int32_t *) obj->pltgot;
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if ((pltgot[8] & 0xffff0000) == 0x279f0000)
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obj->pltgot[2] = (Elf_Addr) &_rtld_bind_start_old;
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else
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obj->pltgot[2] = (Elf_Addr) &_rtld_bind_start;
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/* Identify this shared object */
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obj->pltgot[3] = (Elf_Addr) obj;
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}
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@ -43,6 +43,9 @@ Elf_Addr reloc_jmpslot(Elf_Addr *, Elf_Addr,
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#define call_initfini_pointer(obj, target) \
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(((InitFunc)(target))())
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/* Lazy binding entry point, called via PLT. */
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void _rtld_bind_start_old(void);
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/* Atomic operations. */
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int cmp0_and_store_int(volatile int *, int);
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void atomic_add_int(volatile int *, int);
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@ -33,6 +33,7 @@
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#include <machine/pal.h>
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.extern _GLOBAL_OFFSET_TABLE_
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.extern _GOT_END_
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LEAF(_rtld_start, 0) /* XXX */
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.set noreorder
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@ -58,7 +59,7 @@ $34: ldiq t3, $34 /* get where the linker thought we were */
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lda t5, _GLOBAL_OFFSET_TABLE_
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addq t8, t5, t9 /* add the displacement */
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lda t4, _DYNAMIC
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lda t4, _GOT_END_
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addq t8, t4, t10 /* add the displacement */
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/*
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@ -87,7 +88,7 @@ $35: ldq t1, 0(t9) /* load the value */
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lda sp, 16(sp) /* readjust our stack */
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mov s0, a0 /* stack pointer */
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mov s1, a3 /* ps_strings pointer */
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mov v0, t12
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mov v0, pv
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jsr ra, (v0), 0 /* (*_start)(sp, cleanup, obj); */
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ldgp gp, 0(ra)
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@ -95,77 +96,118 @@ $35: ldq t1, 0(t9) /* load the value */
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halt
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END(_rtld_start)
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.set noat
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.globl _rtld_bind_start
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.ent _rtld_bind_start
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_rtld_bind_start:
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#define RTLD_BIND_START_PROLOGUE \
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/* at_reg already used by PLT code. */ \
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.set noat ; \
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\
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/* \
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* Allocate stack frame and preserve all registers that the \
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* caller would have normally saved themselves. \
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*/ \
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lda sp, -168(sp) ; \
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stq ra, 0(sp) ; \
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stq v0, 8(sp) ; \
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stq t0, 16(sp) ; \
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stq t1, 24(sp) ; \
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stq t2, 32(sp) ; \
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stq t3, 40(sp) ; \
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stq t4, 48(sp) ; \
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stq t5, 56(sp) ; \
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stq t6, 64(sp) ; \
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stq t7, 72(sp) ; \
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stq a0, 80(sp) ; \
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stq a1, 88(sp) ; \
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stq a2, 96(sp) ; \
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stq a3, 104(sp) ; \
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stq a4, 112(sp) ; \
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stq a5, 120(sp) ; \
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stq t8, 128(sp) ; \
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stq t9, 136(sp) ; \
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stq t10, 144(sp) ; \
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stq t11, 152(sp) ; \
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stq gp, 160(sp) ; \
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\
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/* \
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* Load our global pointer. Note, can't use pv, since it is \
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* already used by the PLT code. \
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*/ \
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br t0, 1f ; \
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1: LDGP(t0)
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#define RTLD_BIND_START_EPILOGUE \
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/* Move the destination address into position. */ \
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mov v0, pv ; \
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\
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/* Restore program registers. */ \
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ldq ra, 0(sp) ; \
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ldq v0, 8(sp) ; \
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ldq t0, 16(sp) ; \
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ldq t1, 24(sp) ; \
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ldq t2, 32(sp) ; \
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ldq t3, 40(sp) ; \
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ldq t4, 48(sp) ; \
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ldq t5, 56(sp) ; \
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ldq t6, 64(sp) ; \
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ldq t7, 72(sp) ; \
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ldq a0, 80(sp) ; \
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ldq a1, 88(sp) ; \
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ldq a2, 96(sp) ; \
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ldq a3, 104(sp) ; \
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ldq a4, 112(sp) ; \
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ldq a5, 120(sp) ; \
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ldq t8, 128(sp) ; \
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ldq t9, 136(sp) ; \
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ldq t10, 144(sp) ; \
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ldq t11, 152(sp) ; \
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ldq gp, 160(sp) ; \
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/* XXX LDGP? */ \
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\
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/* \
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* We've patched the PLT; sync the I-stream. \
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*/ \
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imb ; \
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\
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/* Pop the stack frame and turn control to the destination. */ \
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lda sp, 168(sp) ; \
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jmp zero, (pv)
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/*
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* Lazy binding entry point, called via PLT.
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*/
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NESTED_NOPROFILE(_rtld_bind_start, 0, 168, ra, 0, 0)
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RTLD_BIND_START_PROLOGUE
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lda sp, -168(sp)
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.frame sp, 168, $26
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/* Preserve all registers that C normally doesn't. */
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stq $26, 0(sp)
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stq $0, 8(sp)
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stq $1, 16(sp)
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stq $2, 24(sp)
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stq $3, 32(sp)
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stq $4, 40(sp)
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stq $5, 48(sp)
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stq $6, 56(sp)
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stq $7, 64(sp)
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stq $8, 72(sp)
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stq $16, 80(sp)
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stq $17, 88(sp)
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stq $18, 96(sp)
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stq $19, 104(sp)
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stq $20, 112(sp)
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stq $21, 120(sp)
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stq $22, 128(sp)
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stq $23, 136(sp)
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stq $24, 144(sp)
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stq $25, 152(sp)
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stq $29, 160(sp)
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.mask 0x27ff01ff, -168
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/* Set up our $gp */
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br gp, $100
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$100: ldgp gp, 0(gp)
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.prologue 1
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/* Set up the arguments for _rtld_bind. */
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subq at_reg, t12, a1 /* calculate reloc offset */
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ldq a0, 8(t12) /* object structure */
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subq at_reg, pv, a1 /* calculate reloc offset */
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ldq a0, 8(pv) /* object structure */
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subq a1, 20, a1 /* = (at - t11 - 20) / 12 * 24 */
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addq a1, a1, a1
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CALL(_rtld_bind)
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/* Move the destination address into position. */
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mov $0, $27
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/* Restore program registers. */
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ldq $26, 0(sp)
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ldq $0, 8(sp)
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ldq $1, 16(sp)
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ldq $2, 24(sp)
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ldq $3, 32(sp)
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||||
ldq $4, 40(sp)
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||||
ldq $5, 48(sp)
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||||
ldq $6, 56(sp)
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||||
ldq $7, 64(sp)
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||||
ldq $8, 72(sp)
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||||
ldq $16, 80(sp)
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||||
ldq $17, 88(sp)
|
||||
ldq $18, 96(sp)
|
||||
ldq $19, 104(sp)
|
||||
ldq $20, 112(sp)
|
||||
ldq $21, 120(sp)
|
||||
ldq $22, 128(sp)
|
||||
ldq $23, 136(sp)
|
||||
ldq $24, 144(sp)
|
||||
ldq $25, 152(sp)
|
||||
ldq $29, 160(sp)
|
||||
/* Flush the Icache after having modified the .plt code. */
|
||||
imb
|
||||
/* Clean up and turn control to the destination */
|
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lda sp, 168(sp)
|
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jmp $31, ($27)
|
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.end _rtld_bind_start
|
||||
RTLD_BIND_START_EPILOGUE
|
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|
||||
END(_rtld_bind_start)
|
||||
|
||||
/*
|
||||
* Lazy binding entry point, called via PLT. This version is for the
|
||||
* old PLT entry format.
|
||||
*/
|
||||
NESTED_NOPROFILE(_rtld_bind_start_old, 0, 168, ra, 0, 0)
|
||||
|
||||
RTLD_BIND_START_PROLOGUE
|
||||
|
||||
/* Set up the arguments for _rtld_bind. */
|
||||
ldq a0, 8(pv) /* object structure */
|
||||
mov at_reg, a1 /* offset of reloc entry */
|
||||
|
||||
CALL(_rtld_bind)
|
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|
||||
RTLD_BIND_START_EPILOGUE
|
||||
|
||||
END(_rtld_bind_start_old)
|
||||
|
||||
/*
|
||||
* int cmp0_and_store_int(volatile int *p, int newval);
|
||||
|
||||
Loading…
Reference in New Issue
Block a user