577 lines
18 KiB
C
577 lines
18 KiB
C
/* Machine-dependent ELF dynamic relocation inline functions. Sparc64 version.
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Copyright (C) 1997-2022 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_machine_h
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#define dl_machine_h
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#define ELF_MACHINE_NAME "sparc64"
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#include <string.h>
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#include <sys/param.h>
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#include <ldsodefs.h>
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#include <sysdep.h>
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#include <dl-plt.h>
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#include <dl-static-tls.h>
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#include <dl-machine-rel.h>
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#define ELF64_R_TYPE_ID(info) ((info) & 0xff)
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#define ELF64_R_TYPE_DATA(info) ((info) >> 8)
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/* Return nonzero iff ELF header is compatible with the running host. */
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static inline int
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elf_machine_matches_host (const Elf64_Ehdr *ehdr)
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{
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return ehdr->e_machine == EM_SPARCV9;
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}
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/* We have to do this because elf_machine_{dynamic,load_address} can be
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invoked from functions that have no GOT references, and thus the compiler
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has no obligation to load the PIC register. */
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#define LOAD_PIC_REG(PIC_REG) \
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do { Elf64_Addr tmp; \
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__asm("sethi %%hi(_GLOBAL_OFFSET_TABLE_-4), %1\n\t" \
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"rd %%pc, %0\n\t" \
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"add %1, %%lo(_GLOBAL_OFFSET_TABLE_+4), %1\n\t" \
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"add %0, %1, %0" \
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: "=r" (PIC_REG), "=r" (tmp)); \
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} while (0)
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/* Return the link-time address of _DYNAMIC. Conveniently, this is the
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first element of the GOT. This must be inlined in a function which
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uses global data. */
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static inline Elf64_Addr
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elf_machine_dynamic (void)
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{
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register Elf64_Addr *elf_pic_register __asm__("%l7");
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LOAD_PIC_REG (elf_pic_register);
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return *elf_pic_register;
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}
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/* Return the run-time load address of the shared object. */
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static inline Elf64_Addr
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elf_machine_load_address (void)
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{
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register Elf32_Addr *pc __asm ("%o7");
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register Elf64_Addr *got __asm ("%l7");
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__asm ("sethi %%hi(_GLOBAL_OFFSET_TABLE_-4), %1\n\t"
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"call 1f\n\t"
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" add %1, %%lo(_GLOBAL_OFFSET_TABLE_+4), %1\n\t"
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"call _DYNAMIC\n\t"
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"call _GLOBAL_OFFSET_TABLE_\n"
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"1:\tadd %1, %0, %1\n\t" : "=r" (pc), "=r" (got));
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/* got is now l_addr + _GLOBAL_OFFSET_TABLE_
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*got is _DYNAMIC
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pc[2]*4 is l_addr + _DYNAMIC - (long)pc - 8
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pc[3]*4 is l_addr + _GLOBAL_OFFSET_TABLE_ - (long)pc - 12 */
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return (Elf64_Addr) got - *got + (Elf32_Sword) ((pc[2] - pc[3]) * 4) - 4;
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}
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static inline Elf64_Addr __attribute__ ((always_inline))
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elf_machine_fixup_plt (struct link_map *map, lookup_t t,
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const ElfW(Sym) *refsym, const ElfW(Sym) *sym,
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const Elf64_Rela *reloc,
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Elf64_Addr *reloc_addr, Elf64_Addr value)
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{
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sparc64_fixup_plt (map, reloc, reloc_addr, value + reloc->r_addend,
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reloc->r_addend, 1);
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return value;
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}
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/* Return the final value of a plt relocation. */
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static inline Elf64_Addr
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elf_machine_plt_value (struct link_map *map, const Elf64_Rela *reloc,
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Elf64_Addr value)
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{
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/* Don't add addend here, but in elf_machine_fixup_plt instead.
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value + reloc->r_addend is the value which should actually be
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stored into .plt data slot. */
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return value;
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}
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/* ELF_RTYPE_CLASS_PLT iff TYPE describes relocation of a PLT entry, so
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PLT entries should not be allowed to define the value.
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ELF_RTYPE_CLASS_COPY iff TYPE should not be allowed to resolve to one
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of the main executable's symbols, as for a COPY reloc. */
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#define elf_machine_type_class(type) \
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((((type) == R_SPARC_JMP_SLOT \
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|| ((type) >= R_SPARC_TLS_GD_HI22 && (type) <= R_SPARC_TLS_TPOFF64)) \
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* ELF_RTYPE_CLASS_PLT) \
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| (((type) == R_SPARC_COPY) * ELF_RTYPE_CLASS_COPY))
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/* A reloc type used for ld.so cmdline arg lookups to reject PLT entries. */
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#define ELF_MACHINE_JMP_SLOT R_SPARC_JMP_SLOT
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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 int
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elf_machine_runtime_setup (struct link_map *l, struct r_scope_elem *scope[],
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int lazy, int profile)
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{
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if (l->l_info[DT_JMPREL] && lazy)
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{
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extern void _dl_runtime_resolve_0 (void);
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extern void _dl_runtime_resolve_1 (void);
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extern void _dl_runtime_profile_0 (void);
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extern void _dl_runtime_profile_1 (void);
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Elf64_Addr res0_addr, res1_addr;
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unsigned int *plt = (void *) D_PTR (l, l_info[DT_PLTGOT]);
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if (__builtin_expect(profile, 0))
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{
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res0_addr = (Elf64_Addr) &_dl_runtime_profile_0;
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res1_addr = (Elf64_Addr) &_dl_runtime_profile_1;
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if (GLRO(dl_profile) != NULL
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&& _dl_name_match_p (GLRO(dl_profile), l))
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GL(dl_profile_map) = l;
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}
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else
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{
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res0_addr = (Elf64_Addr) &_dl_runtime_resolve_0;
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res1_addr = (Elf64_Addr) &_dl_runtime_resolve_1;
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}
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/* PLT0 looks like:
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sethi %uhi(_dl_runtime_{resolve,profile}_0), %g4
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sethi %hi(_dl_runtime_{resolve,profile}_0), %g5
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or %g4, %ulo(_dl_runtime_{resolve,profile}_0), %g4
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or %g5, %lo(_dl_runtime_{resolve,profile}_0), %g5
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sllx %g4, 32, %g4
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add %g4, %g5, %g5
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jmpl %g5, %g4
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nop
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*/
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plt[0] = 0x09000000 | (res0_addr >> (64 - 22));
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plt[1] = 0x0b000000 | ((res0_addr >> 10) & 0x003fffff);
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plt[2] = 0x88112000 | ((res0_addr >> 32) & 0x3ff);
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plt[3] = 0x8a116000 | (res0_addr & 0x3ff);
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plt[4] = 0x89293020;
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plt[5] = 0x8a010005;
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plt[6] = 0x89c14000;
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plt[7] = 0x01000000;
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/* PLT1 looks like:
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sethi %uhi(_dl_runtime_{resolve,profile}_1), %g4
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sethi %hi(_dl_runtime_{resolve,profile}_1), %g5
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or %g4, %ulo(_dl_runtime_{resolve,profile}_1), %g4
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or %g5, %lo(_dl_runtime_{resolve,profile}_1), %g5
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sllx %g4, 32, %g4
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add %g4, %g5, %g5
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jmpl %g5, %g4
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nop
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*/
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plt[8] = 0x09000000 | (res1_addr >> (64 - 22));
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plt[9] = 0x0b000000 | ((res1_addr >> 10) & 0x003fffff);
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plt[10] = 0x88112000 | ((res1_addr >> 32) & 0x3ff);
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plt[11] = 0x8a116000 | (res1_addr & 0x3ff);
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plt[12] = 0x89293020;
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plt[13] = 0x8a010005;
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plt[14] = 0x89c14000;
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plt[15] = 0x01000000;
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/* Now put the magic cookie at the beginning of .PLT2
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Entry .PLT3 is unused by this implementation. */
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*((struct link_map **)(&plt[16])) = l;
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}
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return lazy;
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}
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/* The PLT uses Elf64_Rela relocs. */
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#define elf_machine_relplt elf_machine_rela
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/* Undo the sub %sp, 6*8, %sp; add %sp, STACK_BIAS + 22*8, %o0 below
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(but w/o STACK_BIAS) to get at the value we want in __libc_stack_end. */
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#define DL_STACK_END(cookie) \
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((void *) (((long) (cookie)) - (22 - 6) * 8))
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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_GOT_ADDRESS(pic_reg, reg, symbol) \
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"sethi %gdop_hix22(" #symbol "), " #reg "\n\t" \
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"xor " #reg ", %gdop_lox10(" #symbol "), " #reg "\n\t" \
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"ldx [" #pic_reg " + " #reg "], " #reg ", %gdop(" #symbol ")\n"
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#define __S1(x) #x
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#define __S(x) __S1(x)
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#define RTLD_START __asm__ ( "\n" \
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" .text\n" \
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" .global _start\n" \
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" .type _start, @function\n" \
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" .align 32\n" \
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"_start:\n" \
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" /* Make room for functions to drop their arguments on the stack. */\n" \
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" sub %sp, 6*8, %sp\n" \
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" /* Pass pointer to argument block to _dl_start. */\n" \
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" call _dl_start\n" \
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" add %sp," __S(STACK_BIAS) "+22*8,%o0\n" \
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" /* FALLTHRU */\n" \
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" .size _start, .-_start\n" \
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"\n" \
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" .global _dl_start_user\n" \
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" .type _dl_start_user, @function\n" \
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"_dl_start_user:\n" \
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" /* Load the GOT register. */\n" \
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"1: call 11f\n" \
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" sethi %hi(_GLOBAL_OFFSET_TABLE_-(1b-.)), %l7\n" \
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"11: or %l7, %lo(_GLOBAL_OFFSET_TABLE_-(1b-.)), %l7\n" \
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" add %l7, %o7, %l7\n" \
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" /* Save the user entry point address in %l0. */\n" \
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" mov %o0, %l0\n" \
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" ldx [%sp + " __S(STACK_BIAS) " + 22*8], %i5\n" \
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" /* %o0 = _dl_loaded, %o1 = argc, %o2 = argv, %o3 = envp. */\n" \
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"" RTLD_GOT_ADDRESS(%l7, %o0, _rtld_local) \
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" sllx %i5, 3, %o3\n" \
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" add %sp, " __S(STACK_BIAS) " + 23*8, %o2\n" \
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" add %o3, 8, %o3\n" \
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" mov %i5, %o1\n" \
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" add %o2, %o3, %o3\n" \
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" call _dl_init\n" \
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" ldx [%o0], %o0\n" \
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" /* Pass our finalizer function to the user in %g1. */\n" \
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RTLD_GOT_ADDRESS(%l7, %g1, _dl_fini) \
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" /* Jump to the user's entry point and deallocate the extra stack we got. */\n" \
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" jmp %l0\n" \
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" add %sp, 6*8, %sp\n" \
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" .size _dl_start_user, . - _dl_start_user\n" \
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" .previous\n");
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#endif /* dl_machine_h */
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#define ARCH_LA_PLTENTER sparc64_gnu_pltenter
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#define ARCH_LA_PLTEXIT sparc64_gnu_pltexit
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#ifdef RESOLVE_MAP
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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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__attribute__ ((always_inline))
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elf_machine_rela (struct link_map *map, struct r_scope_elem *scope[],
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const Elf64_Rela *reloc, const Elf64_Sym *sym,
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const struct r_found_version *version,
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void *const reloc_addr_arg, int skip_ifunc)
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{
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Elf64_Addr *const reloc_addr = reloc_addr_arg;
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#if !defined RTLD_BOOTSTRAP
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const Elf64_Sym *const refsym = sym;
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#endif
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Elf64_Addr value;
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const unsigned long int r_type = ELF64_R_TYPE_ID (reloc->r_info);
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struct link_map *sym_map = NULL;
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if (__glibc_unlikely (r_type == R_SPARC_NONE))
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return;
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if (__glibc_unlikely (r_type == R_SPARC_SIZE64))
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{
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*reloc_addr = sym->st_size + reloc->r_addend;
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return;
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}
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#if !defined RTLD_BOOTSTRAP
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if (__glibc_unlikely (r_type == R_SPARC_RELATIVE))
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{
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*reloc_addr += map->l_addr + reloc->r_addend;
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return;
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}
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#endif
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if (__builtin_expect (ELF64_ST_BIND (sym->st_info) == STB_LOCAL, 0)
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&& sym->st_shndx != SHN_UNDEF)
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{
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sym_map = map;
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value = map->l_addr;
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}
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else
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{
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sym_map = RESOLVE_MAP (map, scope, &sym, version, r_type);
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value = SYMBOL_ADDRESS (sym_map, sym, true);
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}
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value += reloc->r_addend; /* Assume copy relocs have zero addend. */
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if (sym != NULL
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&& __builtin_expect (ELFW(ST_TYPE) (sym->st_info) == STT_GNU_IFUNC, 0)
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&& __builtin_expect (sym->st_shndx != SHN_UNDEF, 1)
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&& __builtin_expect (!skip_ifunc, 1))
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value = ((Elf64_Addr (*) (int)) value) (GLRO(dl_hwcap));
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switch (r_type)
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{
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#if !defined RTLD_BOOTSTRAP
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case R_SPARC_COPY:
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if (sym == NULL)
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/* This can happen in trace mode if an object could not be
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found. */
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break;
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if (sym->st_size > refsym->st_size
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|| (GLRO(dl_verbose) && sym->st_size < refsym->st_size))
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{
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const char *strtab;
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strtab = (const void *) D_PTR (map, l_info[DT_STRTAB]);
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_dl_error_printf ("\
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%s: Symbol `%s' has different size in shared object, consider re-linking\n",
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RTLD_PROGNAME, strtab + refsym->st_name);
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}
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memcpy (reloc_addr_arg, (void *) value,
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MIN (sym->st_size, refsym->st_size));
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break;
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#endif
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case R_SPARC_64:
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case R_SPARC_GLOB_DAT:
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*reloc_addr = value;
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break;
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case R_SPARC_IRELATIVE:
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if (__glibc_likely (!skip_ifunc))
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value = ((Elf64_Addr (*) (int)) value) (GLRO(dl_hwcap));
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*reloc_addr = value;
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break;
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case R_SPARC_JMP_IREL:
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if (__glibc_likely (!skip_ifunc))
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value = ((Elf64_Addr (*) (int)) value) (GLRO(dl_hwcap));
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/* 'high' is always zero, for large PLT entries the linker
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emits an R_SPARC_IRELATIVE. */
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sparc64_fixup_plt (map, reloc, reloc_addr, value, 0, 0);
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break;
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case R_SPARC_JMP_SLOT:
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sparc64_fixup_plt (map, reloc, reloc_addr, value, reloc->r_addend, 0);
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break;
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case R_SPARC_TLS_DTPMOD64:
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/* Get the information from the link map returned by the
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resolv function. */
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if (sym_map != NULL)
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*reloc_addr = sym_map->l_tls_modid;
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break;
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case R_SPARC_TLS_DTPOFF64:
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/* During relocation all TLS symbols are defined and used.
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Therefore the offset is already correct. */
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*reloc_addr = (sym == NULL ? 0 : sym->st_value) + reloc->r_addend;
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break;
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case R_SPARC_TLS_TPOFF64:
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/* The offset is negative, forward from the thread pointer. */
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/* We know the offset of object the symbol is contained in.
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It is a negative value which will be added to the
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thread pointer. */
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if (sym != NULL)
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{
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CHECK_STATIC_TLS (map, sym_map);
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*reloc_addr = sym->st_value - sym_map->l_tls_offset
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+ reloc->r_addend;
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}
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break;
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#ifndef RTLD_BOOTSTRAP
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case R_SPARC_TLS_LE_HIX22:
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case R_SPARC_TLS_LE_LOX10:
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if (sym != NULL)
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{
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CHECK_STATIC_TLS (map, sym_map);
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value = sym->st_value - sym_map->l_tls_offset
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+ reloc->r_addend;
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if (r_type == R_SPARC_TLS_LE_HIX22)
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*(unsigned int *)reloc_addr =
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((*(unsigned int *)reloc_addr & 0xffc00000)
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| (((~value) >> 10) & 0x3fffff));
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else
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*(unsigned int *)reloc_addr =
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((*(unsigned int *)reloc_addr & 0xffffe000) | (value & 0x3ff)
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| 0x1c00);
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}
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break;
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#endif
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#ifndef RTLD_BOOTSTRAP
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case R_SPARC_8:
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*(char *) reloc_addr = value;
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break;
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case R_SPARC_16:
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*(short *) reloc_addr = value;
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break;
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case R_SPARC_32:
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*(unsigned int *) reloc_addr = value;
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break;
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case R_SPARC_DISP8:
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*(char *) reloc_addr = (value - (Elf64_Addr) reloc_addr);
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break;
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case R_SPARC_DISP16:
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*(short *) reloc_addr = (value - (Elf64_Addr) reloc_addr);
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break;
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case R_SPARC_DISP32:
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*(unsigned int *) reloc_addr = (value - (Elf64_Addr) reloc_addr);
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break;
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case R_SPARC_DISP64:
|
|
*reloc_addr = (value - (Elf64_Addr) reloc_addr);
|
|
break;
|
|
case R_SPARC_REGISTER:
|
|
*reloc_addr = value;
|
|
break;
|
|
case R_SPARC_WDISP30:
|
|
*(unsigned int *) reloc_addr =
|
|
((*(unsigned int *)reloc_addr & 0xc0000000)
|
|
| (((value - (Elf64_Addr) reloc_addr) >> 2) & 0x3fffffff));
|
|
break;
|
|
|
|
/* MEDLOW code model relocs */
|
|
case R_SPARC_LO10:
|
|
*(unsigned int *) reloc_addr =
|
|
((*(unsigned int *)reloc_addr & ~0x3ff)
|
|
| (value & 0x3ff));
|
|
break;
|
|
case R_SPARC_HI22:
|
|
*(unsigned int *) reloc_addr =
|
|
((*(unsigned int *)reloc_addr & 0xffc00000)
|
|
| ((value >> 10) & 0x3fffff));
|
|
break;
|
|
case R_SPARC_OLO10:
|
|
*(unsigned int *) reloc_addr =
|
|
((*(unsigned int *)reloc_addr & ~0x1fff)
|
|
| (((value & 0x3ff) + ELF64_R_TYPE_DATA (reloc->r_info)) & 0x1fff));
|
|
break;
|
|
|
|
/* ABS34 code model reloc */
|
|
case R_SPARC_H34:
|
|
*(unsigned int *) reloc_addr =
|
|
((*(unsigned int *)reloc_addr & 0xffc00000)
|
|
| ((value >> 12) & 0x3fffff));
|
|
break;
|
|
|
|
/* MEDMID code model relocs */
|
|
case R_SPARC_H44:
|
|
*(unsigned int *) reloc_addr =
|
|
((*(unsigned int *)reloc_addr & 0xffc00000)
|
|
| ((value >> 22) & 0x3fffff));
|
|
break;
|
|
case R_SPARC_M44:
|
|
*(unsigned int *) reloc_addr =
|
|
((*(unsigned int *)reloc_addr & ~0x3ff)
|
|
| ((value >> 12) & 0x3ff));
|
|
break;
|
|
case R_SPARC_L44:
|
|
*(unsigned int *) reloc_addr =
|
|
((*(unsigned int *)reloc_addr & ~0xfff)
|
|
| (value & 0xfff));
|
|
break;
|
|
|
|
/* MEDANY code model relocs */
|
|
case R_SPARC_HH22:
|
|
*(unsigned int *) reloc_addr =
|
|
((*(unsigned int *)reloc_addr & 0xffc00000)
|
|
| (value >> 42));
|
|
break;
|
|
case R_SPARC_HM10:
|
|
*(unsigned int *) reloc_addr =
|
|
((*(unsigned int *)reloc_addr & ~0x3ff)
|
|
| ((value >> 32) & 0x3ff));
|
|
break;
|
|
case R_SPARC_LM22:
|
|
*(unsigned int *) reloc_addr =
|
|
((*(unsigned int *)reloc_addr & 0xffc00000)
|
|
| ((value >> 10) & 0x003fffff));
|
|
break;
|
|
case R_SPARC_UA16:
|
|
((unsigned char *) reloc_addr_arg) [0] = value >> 8;
|
|
((unsigned char *) reloc_addr_arg) [1] = value;
|
|
break;
|
|
case R_SPARC_UA32:
|
|
((unsigned char *) reloc_addr_arg) [0] = value >> 24;
|
|
((unsigned char *) reloc_addr_arg) [1] = value >> 16;
|
|
((unsigned char *) reloc_addr_arg) [2] = value >> 8;
|
|
((unsigned char *) reloc_addr_arg) [3] = value;
|
|
break;
|
|
case R_SPARC_UA64:
|
|
if (! ((long) reloc_addr_arg & 3))
|
|
{
|
|
/* Common in .eh_frame */
|
|
((unsigned int *) reloc_addr_arg) [0] = value >> 32;
|
|
((unsigned int *) reloc_addr_arg) [1] = value;
|
|
break;
|
|
}
|
|
((unsigned char *) reloc_addr_arg) [0] = value >> 56;
|
|
((unsigned char *) reloc_addr_arg) [1] = value >> 48;
|
|
((unsigned char *) reloc_addr_arg) [2] = value >> 40;
|
|
((unsigned char *) reloc_addr_arg) [3] = value >> 32;
|
|
((unsigned char *) reloc_addr_arg) [4] = value >> 24;
|
|
((unsigned char *) reloc_addr_arg) [5] = value >> 16;
|
|
((unsigned char *) reloc_addr_arg) [6] = value >> 8;
|
|
((unsigned char *) reloc_addr_arg) [7] = value;
|
|
break;
|
|
#endif
|
|
#if !defined RTLD_BOOTSTRAP || defined _NDEBUG
|
|
default:
|
|
_dl_reloc_bad_type (map, r_type, 0);
|
|
break;
|
|
#endif
|
|
}
|
|
}
|
|
|
|
static inline void
|
|
__attribute__ ((always_inline))
|
|
elf_machine_rela_relative (Elf64_Addr l_addr, const Elf64_Rela *reloc,
|
|
void *const reloc_addr_arg)
|
|
{
|
|
Elf64_Addr *const reloc_addr = reloc_addr_arg;
|
|
*reloc_addr = l_addr + reloc->r_addend;
|
|
}
|
|
|
|
static inline void
|
|
__attribute__ ((always_inline))
|
|
elf_machine_lazy_rel (struct link_map *map, struct r_scope_elem *scope[],
|
|
Elf64_Addr l_addr, const Elf64_Rela *reloc,
|
|
int skip_ifunc)
|
|
{
|
|
Elf64_Addr *const reloc_addr = (void *) (l_addr + reloc->r_offset);
|
|
const unsigned int r_type = ELF64_R_TYPE (reloc->r_info);
|
|
|
|
if (__glibc_likely (r_type == R_SPARC_JMP_SLOT))
|
|
;
|
|
else if (r_type == R_SPARC_JMP_IREL
|
|
|| r_type == R_SPARC_IRELATIVE)
|
|
{
|
|
Elf64_Addr value = map->l_addr + reloc->r_addend;
|
|
if (__glibc_likely (!skip_ifunc))
|
|
value = ((Elf64_Addr (*) (int)) value) (GLRO(dl_hwcap));
|
|
if (r_type == R_SPARC_JMP_IREL)
|
|
{
|
|
/* 'high' is always zero, for large PLT entries the linker
|
|
emits an R_SPARC_IRELATIVE. */
|
|
sparc64_fixup_plt (map, reloc, reloc_addr, value, 0, 1);
|
|
}
|
|
else
|
|
*reloc_addr = value;
|
|
}
|
|
else if (r_type == R_SPARC_NONE)
|
|
;
|
|
else
|
|
_dl_reloc_bad_type (map, r_type, 1);
|
|
}
|
|
|
|
#endif /* RESOLVE_MAP */
|