mirror of
https://sourceware.org/git/glibc.git
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Sat Feb 10 13:09:03 1996 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de>
* sysdeps/unix/sysv/linux/sys/mman.h: Define MAP_ANON and MAP_FILE if not already defined. * elf/elf.h: Add m68k reloc definitions. * sysdeps/m68k/dl-machine.h, sysdeps/m68k/elf/start.S: New files.
This commit is contained in:
Roland McGrath
parent
7fb027dc33
commit
5f51e1132a
230
sysdeps/m68k/dl-machine.h
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230
sysdeps/m68k/dl-machine.h
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/* Machine-dependent ELF dynamic relocation inline functions. m68k version.
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Copyright (C) 1996 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 Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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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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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If
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not, write to the Free Software Foundation, Inc., 675 Mass Ave,
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Cambridge, MA 02139, USA. */
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#define ELF_MACHINE_NAME "m68k"
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#include <assert.h>
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#include <string.h>
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#include <link.h>
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/* Return nonzero iff E_MACHINE is compatible with the running host. */
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static inline int
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elf_machine_matches_host (Elf32_Half e_machine)
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{
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switch (e_machine)
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{
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case EM_68K:
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return 1;
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default:
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return 0;
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}
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}
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/* Return the run-time address of the _GLOBAL_OFFSET_TABLE_.
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Must be inlined in a function which uses global data. */
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static inline Elf32_Addr *
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elf_machine_got (void)
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{
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register Elf32_Addr *got asm ("%a5");
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return got;
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}
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/* Return the run-time load address of the shared object. */
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static inline Elf32_Addr
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elf_machine_load_address (void)
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{
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...
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}
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/* Perform the relocation specified by RELOC and SYM (which is fully resolved).
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MAP is the object containing the reloc. */
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static inline void
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elf_machine_rela (struct link_map *map,
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const Elf32_Rela *reloc,
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Elf32_Addr sym_loadaddr, const Elf32_Sym *sym)
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{
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Elf32_Addr *const reloc_addr = (void *) (map->l_addr + reloc->r_offset);
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const Elf32_Addr sym_value = sym ? sym_loadaddr + sym->st_value : 0;
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switch (ELF32_R_TYPE (reloc->r_info))
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{
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case R_68K_COPY:
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memcpy (reloc_addr, (void *) sym_value, sym->st_size);
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break;
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case R_68K_GLOB_DAT:
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case R_68K_JMP_SLOT:
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*reloc_addr = sym_value;
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break;
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case R_68K_8:
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*(char *) reloc_addr = sym_value + reloc->r_addend;
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break;
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case R_68K_16:
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*(short *) reloc_addr = sym_value + reloc->r_addend;
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break;
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case R_68K_32:
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*reloc_addr = sym_value + reloc->r_addend;
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break;
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case R_68K_RELATIVE:
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*reloc_addr = map->l_addr + reloc->r_addend;
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break;
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case R_68K_PC8:
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*(char *) reloc_addr = (sym_value + reloc->r_addend
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- (Elf32_Addr) reloc_addr);
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break;
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case R_68K_PC16:
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*(short *) reloc_addr = (sym_value + reloc->r_addend
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- (Elf32_Addr) reloc_addr);
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break;
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case R_68K_PC32:
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*reloc_addr = sym_value + reloc->r_addend - (Elf32_Addr) reloc_addr;
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break;
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case R_68K_NONE: /* Alright, Wilbur. */
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break;
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default:
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assert (! "unexpected dynamic reloc type");
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break;
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}
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}
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static inline void
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elf_machine_lazy_rel (struct link_map *map, const Elf32_Rela *reloc)
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{
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Elf32_Addr *const reloc_addr = (void *) (map->l_addr + reloc->r_offset);
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switch (ELF32_R_TYPE (reloc->r_info))
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{
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case R_68K_NONE:
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break;
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case R_68K_JMP_SLOT:
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*reloc_addr += map->l_addr;
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break;
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default:
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assert (! "unexpected PLT reloc type");
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break;
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}
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}
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/* The m68k never uses Elf32_Rel relocations. */
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#define ELF_MACHINE_NO_REL 1
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/* Set up the loaded object described by L so its unrelocated PLT
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entries will jump to the on-demand fixup code in dl-runtime.c. */
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static inline void
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elf_machine_runtime_setup (struct link_map *l, int lazy)
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{
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Elf32_Addr *got;
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extern void _dl_runtime_resolve (Elf32_Word);
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if (l->l_info[DT_JMPREL] && lazy)
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{
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/* The GOT entries for functions in the PLT have not yet been
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filled in. Their initial contents will arrange when called
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to push an offset into the .rela.plt section, push
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_GLOBAL_OFFSET_TABLE_[1], and then jump to
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_GLOBAL_OFFSET_TABLE_[2]. */
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got = (Elf32_Addr *) (l->l_addr + l->l_info[DT_PLTGOT]->d_un.d_ptr);
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got[1] = (Elf32_Addr) l; /* Identify this shared object. */
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/* This function will get called to fix up the GOT entry
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indicated by the offset on the stack, and then jump to the
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resolved address. */
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got[2] = (Elf32_Addr) &_dl_runtime_resolve;
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}
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/* This code is used in dl-runtime.c to call the `fixup' function
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and then redirect to the address it returns. */
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#define ELF_MACHINE_RUNTIME_TRAMPOLINE asm ("\
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| Trampoline for _dl_runtime_resolver
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.globl _dl_runtime_resolve
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.type _dl_runtime_resolve, @function
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_dl_runtime_resolve:
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| Save %a0 (struct return address).
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move.l %a0, -(%sp)
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| Call the real address resolver.
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bsr.l fixup
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| Restore register %a0.
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move.l (%sp)+, %a0
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| Pop parameters
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addq.l #8, %sp
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| Call real function.
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jmp (%d0)
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.size _dl_runtime_resolve, . - _dl_runtime_resolve
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");
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#define ELF_MACHINE_RUNTIME_FIXUP_ARGS long int save_a0
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}
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/* Mask identifying addresses reserved for the user program,
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where the dynamic linker should not map anything. */
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#define ELF_MACHINE_USER_ADDRESS_MASK 0x80000000UL
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/* Initial entry point code for the dynamic linker.
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The C function `_dl_start' is the real entry point;
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its return value is the user program's entry point. */
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#define RTLD_START asm ("\
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.text
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.globl _start
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.globl _dl_start_user
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_start:
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jbsr _dl_start
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_dl_start_user:
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| Save the user entry point address in %a4.
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move.l %d0, %a4
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| Point %a5 at the GOT.
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lea _GLOBAL_OFFSET_TABLE_@GOTPC(%pc), %a5
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| See if we were run as a command with the executable file
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| name as an extra leading argument.
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move.l ([_dl_skip_args@GOT, %a5]), %d0
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jeq 0f
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| Pop the original argument count
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move.l (%sp)+, %d1
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| Subtract _dl_skip_args from it.
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sub.l %d0, %d1
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| Adjust the stack pointer to skip _dl_skip_args words.
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lea (%sp, %d0*4), %sp
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| Push back the modified argument count.
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move.l %d1, -(%sp)
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| Call _dl_init_next to return the address of an initializer
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| function to run.
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0: bsr.l _dl_init_next@PLTPC
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| Check for zero return, when out of initializers.
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tst.l %d0
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jeq 1f
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| Call the shared object initializer function.
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| NOTE: We depend only on the registers (%a4 and %a5)
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| and the return address pushed by this call;
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| the initializer is called with the stack just
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| as it appears on entry, and it is free to move
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| the stack around, as long as it winds up jumping to
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| the return address on the top of the stack.
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move.l %d0, %a0
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jsr (%a0)
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| Loop to call _dl_init_next for the next initializer.
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jra 0b
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1: | Pass our finalizer function to the user in %a1.
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move.l _dl_fini@GOT(%a5), %a1
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| Initialize %fp with the stack pointer.
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move.l %sp, %fp
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| Jump to the user's entry point.
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jmp (%a4)");
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90
sysdeps/m68k/elf/start.S
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90
sysdeps/m68k/elf/start.S
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@ -0,0 +1,90 @@
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/* Startup code compliant to the ELF m68k ABI.
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Copyright (C) 1996 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 Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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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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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If
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not, write to the Free Software Foundation, Inc., 675 Mass Ave,
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Cambridge, MA 02139, USA. */
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/* This is the canonical entry point, usually the first thing in the text
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segment. The SVR4/m68k ABI says that when the entry point runs,
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most registers' values are unspecified, except for:
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%a1 Contains a function pointer to be registered with `atexit'.
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This is how the dynamic linker arranges to have DT_FINI
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functions called for shared libraries that have been loaded
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before this code runs.
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%sp The stack contains the arguments and environment:
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0(%sp) argc
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4(%sp) argv[0]
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...
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(4*argc)(%sp) NULL
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(4*(argc+1))(%sp) envp[0]
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...
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NULL
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*/
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.text
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.globl _start
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_start:
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/* Clear the frame pointer. The ABI suggests this be done, to mark
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the outermost frame obviously. */
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sub.l %fp, %fp
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/* %a1 contains the address of the shared library termination
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function, which we will register with `atexit' to be called by
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`exit'. */
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tstl %a1
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jbeq 1f
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move.l %a1, -(%sp)
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jbsr atexit
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addql #4, %sp
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1:
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/* Do essential libc initialization. In statically linked
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programs under the GNU Hurd, this is what sets up the
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arguments on the stack for the code below. */
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jbsr __libc_init_first
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/* Extract the arguments and environment as encoded on the stack
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and set up the arguments for `main': argc, argv, envp. */
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move.l (%sp)+, %d0 /* Pop the argument count. */
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lea (4,%sp,%d0*4), %a0 /* envp = &argv[argc + 1] */
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move.l %a0, _environ /* Store it in the global variable. */
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pea (%a0) /* Push third argument: envp. */
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pea 4(%sp) /* Push second argument: argv. */
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move.l %d0, -(%sp) /* Push first argument: argc. */
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/* Call `_init', which is the entry point to our own `.init'
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section; and register with `atexit' to have `exit' call
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`_fini', which is the entry point to our own `.fini' section. */
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jbsr _init
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move.l #_fini, -(%sp)
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jbsr atexit
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addq.l #4, %sp
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/* Call the user's main function, and exit with its value. */
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jbsr main
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move.l %d0, (%sp)
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1: jbsr exit /* This should never return. */
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jbra 1b /* Try again if somehow it does return. */
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/* Define a symbol for the first piece of initialized data. */
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.data
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.globl __data_start
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__data_start:
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.long 0
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.weak data_start
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data_start = __data_start
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