347 lines
11 KiB
C
347 lines
11 KiB
C
/* Machine-dependent ELF dynamic relocation inline functions. C-SKY version.
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Copyright (C) 2018-2022 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 "csky"
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#include <sys/param.h>
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#include <sysdep.h>
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#include <dl-tls.h>
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#include <dl-static-tls.h>
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#include <dl-machine-rel.h>
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/* Return nonzero if ELF header is compatible with the running host. */
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static inline int
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elf_machine_matches_host (const Elf32_Ehdr *ehdr)
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{
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return ehdr->e_machine == EM_CSKY;
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}
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/* Return the link-time address of _DYNAMIC.
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This must be inlined in a function which uses global data. */
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static inline Elf32_Addr
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elf_machine_dynamic (void)
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{
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register Elf32_Addr *got __asm__ ("gb");
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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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extern Elf32_Addr __dl_start (void *) asm ("_dl_start");
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Elf32_Addr got_addr = (Elf32_Addr) &__dl_start;
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Elf32_Addr pcrel_addr;
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asm ("grs %0,_dl_start\n" : "=r" (pcrel_addr));
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return pcrel_addr - got_addr;
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}
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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 __attribute__ ((always_inline))
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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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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 *) D_PTR (l, l_info[DT_PLTGOT]);
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if (got[1])
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l->l_mach.plt = got[1] + l->l_addr;
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got[1] = (Elf32_Addr) l; /* Identify this shared object. */
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/* The got[2] entry contains the address of a function which gets
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called to get the address of a so far unresolved function and
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jump to it. The profiling extension of the dynamic linker allows
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to intercept the calls to collect information. In this case we
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don't store the address in the GOT so that all future calls also
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end in this function. */
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got[2] = (Elf32_Addr) &_dl_runtime_resolve;
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}
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return lazy;
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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\n\
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.globl _start\n\
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.type _start, @function\n\
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.globl _dl_start_user\n\
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.type _dl_start_user, @function\n\
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_start:\n\
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grs gb, .Lgetpc1\n\
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.Lgetpc1:\n\
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lrw t0, .Lgetpc1@GOTPC\n\
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addu gb, t0\n\
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mov a0, sp\n\
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lrw t1, _dl_start@GOTOFF\n\
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addu t1, gb\n\
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jsr t1\n\
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_dl_start_user:\n\
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/* store program entry address in r10 */ \n\
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mov r10, a0\n\
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/* Get argc */\n\
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ldw a1, (sp, 0)\n\
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/* Get **argv */\n\
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mov a2, sp\n\
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addi a2, 4\n\
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cmpnei r11, 0\n\
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mov a3, a1\n\
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lsli a3, 2\n\
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add a3, a2\n\
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addi a3, 4\n\
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lrw a0, _rtld_local@GOTOFF\n\
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addu a0, gb\n\
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ldw a0, (a0, 0)\n\
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lrw t1, _dl_init@PLT\n\
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addu t1, gb\n\
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ldw t1, (t1)\n\
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jsr t1\n\
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lrw a0, _dl_fini@GOTOFF\n\
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addu a0, gb\n\
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jmp r10\n\
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");
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/* ELF_RTYPE_CLASS_PLT iff TYPE describes relocation of a PLT entry or
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TLS variable, so undefined references should not be allowed to
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define the value.
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ELF_RTYPE_CLASS_NOCOPY 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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#ifndef RTLD_BOOTSTRAP
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# define elf_machine_type_class(type) \
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((((type) == R_CKCORE_JUMP_SLOT || (type) == R_CKCORE_TLS_DTPMOD32 \
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|| (type) == R_CKCORE_TLS_DTPOFF32 || (type) == R_CKCORE_TLS_TPOFF32) \
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* ELF_RTYPE_CLASS_PLT) \
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| (((type) == R_CKCORE_COPY) * ELF_RTYPE_CLASS_COPY))
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#else
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# define elf_machine_type_class(type) \
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((((type) == R_CKCORE_JUMP_SLOT \
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| (((type) == R_CKCORE_COPY) * ELF_RTYPE_CLASS_COPY))
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#endif
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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_CKCORE_JUMP_SLOT
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/* We define an initialization functions. This is called very early in
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_dl_sysdep_start. */
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#define DL_PLATFORM_INIT dl_platform_init ()
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static inline void __attribute__ ((unused))
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dl_platform_init (void)
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{
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if (GLRO(dl_platform) != NULL && *GLRO(dl_platform) == '\0')
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/* Avoid an empty string which would disturb us. */
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GLRO(dl_platform) = NULL;
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}
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static inline Elf32_Addr
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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 Elf32_Rela *reloc,
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Elf32_Addr *reloc_addr, Elf32_Addr value)
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{
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return *reloc_addr = value;
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}
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/* Return the final value of a plt relocation. On the csky the JMP_SLOT
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relocation ignores the addend. */
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static inline Elf32_Addr
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elf_machine_plt_value (struct link_map *map, const Elf32_Rela *reloc,
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Elf32_Addr value)
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{
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return value;
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}
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/* Names of the architecture-specific auditing callback functions. */
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#define ARCH_LA_PLTENTER csky_gnu_pltenter
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#define ARCH_LA_PLTEXIT csky_gnu_pltexit
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#endif /* !dl_machine_h */
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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 __attribute__ ((unused, always_inline))
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elf_machine_rela (struct link_map *map, struct r_scope_elem *scope[],
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const Elf32_Rela *reloc, const Elf32_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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Elf32_Addr *const reloc_addr = reloc_addr_arg;
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const unsigned int r_type = ELF32_R_TYPE (reloc->r_info);
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unsigned short __attribute__ ((unused)) *opcode16_addr;
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Elf32_Addr __attribute__ ((unused)) insn_opcode = 0x0;
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if (__builtin_expect (r_type == R_CKCORE_RELATIVE, 0))
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*reloc_addr = map->l_addr + reloc->r_addend;
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else
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{
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const Elf32_Sym *const refsym = sym;
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struct link_map *sym_map = RESOLVE_MAP (map, scope, &sym, version,
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r_type);
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ElfW(Addr) value = SYMBOL_ADDRESS (sym_map, sym, true);
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opcode16_addr = (unsigned short *)reloc_addr;
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switch (r_type)
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{
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case R_CKCORE_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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|| (sym->st_size < refsym->st_size && GLRO(dl_verbose)))
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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 ?: "<program name unknown>",
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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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case R_CKCORE_GLOB_DAT:
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case R_CKCORE_JUMP_SLOT:
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*reloc_addr = value;
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break;
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case R_CKCORE_ADDR32:
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*reloc_addr = value + reloc->r_addend;
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break;
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case R_CKCORE_PCREL32:
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*reloc_addr = value + reloc->r_addend - (Elf32_Addr) reloc_addr;
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break;
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#if defined(__CK810__) || defined(__CK807__)
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case R_CKCORE_ADDR_HI16:
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insn_opcode = (*opcode16_addr << 16) | (*(opcode16_addr + 1));
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insn_opcode = (insn_opcode & 0xffff0000)
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| (((value + reloc->r_addend) >> 16) & 0xffff);
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*(opcode16_addr++) = (unsigned short)(insn_opcode >> 16);
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*opcode16_addr = (unsigned short)(insn_opcode & 0xffff);
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break;
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case R_CKCORE_ADDR_LO16:
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insn_opcode = (*opcode16_addr << 16) | (*(opcode16_addr + 1));
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insn_opcode = (insn_opcode & 0xffff0000)
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| ((value + reloc->r_addend) & 0xffff);
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*(opcode16_addr++) = (unsigned short)(insn_opcode >> 16);
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*opcode16_addr = (unsigned short)(insn_opcode & 0xffff);
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break;
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case R_CKCORE_PCREL_IMM26BY2:
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{
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unsigned int offset = ((value + reloc->r_addend
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- (unsigned int)reloc_addr) >> 1);
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insn_opcode = (*opcode16_addr << 16) | (*(opcode16_addr + 1));
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if (offset > 0x3ffffff){
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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:The reloc R_CKCORE_PCREL_IMM26BY2 cannot reach the symbol '%s'.\n",
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rtld_progname ?: "<program name unknown>",
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strtab + refsym->st_name);
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break;
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}
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insn_opcode = (insn_opcode & ~0x3ffffff) | offset;
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*(opcode16_addr++) = (unsigned short)(insn_opcode >> 16);
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*opcode16_addr = (unsigned short)(insn_opcode & 0xffff);
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break;
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}
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case R_CKCORE_PCREL_JSR_IMM26BY2:
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break;
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#endif
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#ifndef RTLD_BOOTSTRAP
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case R_CKCORE_TLS_DTPMOD32:
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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_CKCORE_TLS_DTPOFF32:
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if (sym != NULL)
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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_CKCORE_TLS_TPOFF32:
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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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#endif /* !RTLD_BOOTSTRAP */
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case R_CKCORE_NONE:
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break;
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default:
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break;
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}
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}
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}
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static inline void __attribute__ ((unused, always_inline))
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elf_machine_rela_relative (Elf32_Addr l_addr, const Elf32_Rela *reloc,
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void *const reloc_addr_arg)
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{
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Elf32_Addr *const reloc_addr = reloc_addr_arg;
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*reloc_addr = l_addr + reloc->r_addend;
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}
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static inline void __attribute__ ((unused, always_inline))
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elf_machine_lazy_rel (struct link_map *map, struct r_scope_elem *scope[],
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Elf32_Addr l_addr, const Elf32_Rela *reloc,
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int skip_ifunc)
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{
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Elf32_Addr *const reloc_addr = (void *) (l_addr + reloc->r_offset);
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const unsigned int r_type = ELF32_R_TYPE (reloc->r_info);
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if (ELF32_R_TYPE (reloc->r_info) == R_CKCORE_JUMP_SLOT)
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{
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/* Check for unexpected PLT reloc type. */
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if (__builtin_expect (r_type == R_CKCORE_JUMP_SLOT, 1))
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{
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if (__builtin_expect (map->l_mach.plt, 0) == 0)
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*reloc_addr = l_addr + reloc->r_addend;
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else
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*reloc_addr = map->l_mach.plt;
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}
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}
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}
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#endif /* RESOLVE_MAP */
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