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745c3cc10f
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>
60 lines
1.9 KiB
C
60 lines
1.9 KiB
C
/* Function descriptors. HPPA version.
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Copyright (C) 2003-2024 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library 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 GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library. If not, see
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<https://www.gnu.org/licenses/>. */
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#ifndef dl_hppa_fptr_h
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#define dl_hppa_fptr_h 1
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/* An FDESC is a function descriptor. */
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struct fdesc
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{
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ElfW(Addr) ip; /* code entry point */
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ElfW(Addr) gp; /* global pointer */
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};
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struct fdesc_table
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{
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struct fdesc_table *next;
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unsigned int len; /* # of entries in fdesc table */
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volatile unsigned int first_unused; /* index of first available entry */
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struct fdesc fdesc[0];
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};
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struct link_map;
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extern ElfW(Addr) _dl_boot_fptr_table [];
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extern ElfW(Addr) _dl_make_fptr (struct link_map *, const ElfW(Sym) *,
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ElfW(Addr));
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/* Initialize function pointer code. Call before relocation processing. */
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extern void _dl_fptr_init (void);
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/* There are currently 33 dynamic symbols in ld.so.
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ELF_MACHINE_BOOT_FPTR_TABLE_LEN needs to be at least that big. */
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#define ELF_MACHINE_BOOT_FPTR_TABLE_LEN 64
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#define ELF_MACHINE_LOAD_ADDRESS(var, symbol) \
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asm ( \
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" b,l 1f,%0\n" \
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" addil L'" #symbol " - ($PIC_pcrel$0 - 1),%0\n" \
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"1: ldo R'" #symbol " - ($PIC_pcrel$0 - 5)(%%r1),%0\n" \
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: "=&r" (var) : : "r1");
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#endif /* !dl_hppa_fptr_h */
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