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Implement ELF_MACHINE_LOAD_ADDRESS using PC relative loads.

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The current ELF_MACHINE_LOAD_ADDRESS used by the generic
function pointer code was not safe for use before relocation.
The macro has been rewritten to use only PC relative loads.

2009-11-15  Carlos O'Donell  <carlos@codesourcery.com>

	* sysdeps/hppa/dl-fptr.h: Update copyright year.
	Reduce ELF_MACHINE_BOOT_FPTR_TABLE_LEN to 64.
	Implement ELF_MACHINE_LOAD_ADDRESS using PC relative loads.
This commit is contained in:
Carlos O'Donell 2009-11-15 15:11:48 -05:00
parent a2ed3d2a8e
commit 057c783bca
2 changed files with 16 additions and 8 deletions
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6
ChangeLog.hppa
View File

@ -1,3 +1,9 @@
2009-11-15 Carlos O'Donell <carlos@codesourcery.com>
* sysdeps/hppa/dl-fptr.h: Update copyright year.
Reduce ELF_MACHINE_BOOT_FPTR_TABLE_LEN to 64.
Implement ELF_MACHINE_LOAD_ADDRESS using PC relative loads.
2009-11-15 Carlos O'Donell <carlos@codesourcery.com>
* sysdeps/unix/sysv/linux/hppa/nptl/lowlevellock.h:

18
sysdeps/hppa/dl-fptr.h
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@ -1,5 +1,5 @@
/* Function descriptors. HPPA version.
Copyright (C) 2003 Free Software Foundation, Inc.
Copyright (C) 2003, 2009 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
@ -22,14 +22,16 @@
#include <sysdeps/generic/dl-fptr.h>
/* There are currently 20 dynamic symbols in ld.so.
/* There are currently 33 dynamic symbols in ld.so.
ELF_MACHINE_BOOT_FPTR_TABLE_LEN needs to be at least that big. */
#define ELF_MACHINE_BOOT_FPTR_TABLE_LEN 200
#define ELF_MACHINE_LOAD_ADDRESS(var, symbol) \
asm (" addil LT%%" #symbol ", %%r19\n" \
" ldw RT%%" #symbol "(%%sr0,%%r1), %0\n" \
: "=&r" (var));
#define ELF_MACHINE_BOOT_FPTR_TABLE_LEN 64
#define ELF_MACHINE_LOAD_ADDRESS(var, symbol) \
asm ( \
" b,l 1f,%0\n" \
" depi 0,31,2,%0\n" \
"1: addil L'" #symbol " - ($PIC_pcrel$0 - 8),%0\n" \
" ldo R'" #symbol " - ($PIC_pcrel$0 - 12)(%%r1),%0\n" \
: "=&r" (var) : : "r1");
#endif /* !dl_hppa_fptr_h */