glibc/sysdeps/hppa/dl-fptr.h
Adhemerval Zanella 745c3cc10f elf: Make dl-fptr and dl-symaddr hppa specific
With ia64 removal, the function descriptor supports is only used
by HPPA and new architectures do not seem leaning towards this
design.

Reviewed-by: Florian Weimer <fweimer@redhat.com>
2024-08-19 14:54:07 -03:00

60 lines
1.9 KiB
C

/* Function descriptors. HPPA version.
Copyright (C) 2003-2024 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
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library. If not, see
<https://www.gnu.org/licenses/>. */
#ifndef dl_hppa_fptr_h
#define dl_hppa_fptr_h 1
/* An FDESC is a function descriptor. */
struct fdesc
{
ElfW(Addr) ip; /* code entry point */
ElfW(Addr) gp; /* global pointer */
};
struct fdesc_table
{
struct fdesc_table *next;
unsigned int len; /* # of entries in fdesc table */
volatile unsigned int first_unused; /* index of first available entry */
struct fdesc fdesc[0];
};
struct link_map;
extern ElfW(Addr) _dl_boot_fptr_table [];
extern ElfW(Addr) _dl_make_fptr (struct link_map *, const ElfW(Sym) *,
ElfW(Addr));
/* Initialize function pointer code. Call before relocation processing. */
extern void _dl_fptr_init (void);
/* 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 64
#define ELF_MACHINE_LOAD_ADDRESS(var, symbol) \
asm ( \
" b,l 1f,%0\n" \
" addil L'" #symbol " - ($PIC_pcrel$0 - 1),%0\n" \
"1: ldo R'" #symbol " - ($PIC_pcrel$0 - 5)(%%r1),%0\n" \
: "=&r" (var) : : "r1");
#endif /* !dl_hppa_fptr_h */