diff options
Diffstat (limited to 'REORG.TODO/sysdeps/sh/dl-machine.h')
| -rw-r--r-- | REORG.TODO/sysdeps/sh/dl-machine.h | 466 |
1 files changed, 466 insertions, 0 deletions
diff --git a/REORG.TODO/sysdeps/sh/dl-machine.h b/REORG.TODO/sysdeps/sh/dl-machine.h new file mode 100644 index 0000000000..2b468af6fa --- /dev/null +++ b/REORG.TODO/sysdeps/sh/dl-machine.h @@ -0,0 +1,466 @@ +/* Machine-dependent ELF dynamic relocation inline functions. SH version. + Copyright (C) 1999-2017 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + <http://www.gnu.org/licenses/>. */ + +#ifndef dl_machine_h +#define dl_machine_h + +#define ELF_MACHINE_NAME "SH" + +#include <sys/param.h> +#include <sysdep.h> +#include <assert.h> + +/* Return nonzero iff ELF header is compatible with the running host. */ +static inline int __attribute__ ((unused)) +elf_machine_matches_host (const Elf32_Ehdr *ehdr) +{ + return ehdr->e_machine == EM_SH; +} + + +/* Return the link-time address of _DYNAMIC. Conveniently, this is the + first element of the GOT. This must be inlined in a function which + uses global data. */ +static inline Elf32_Addr __attribute__ ((unused)) +elf_machine_dynamic (void) +{ + register Elf32_Addr *got; + asm ("mov r12,%0" :"=r" (got)); + return *got; +} + + +/* Return the run-time load address of the shared object. */ +static inline Elf32_Addr __attribute__ ((unused)) +elf_machine_load_address (void) +{ + Elf32_Addr addr; + asm ("mov.l 1f,r0\n\ + mov.l 3f,r2\n\ + add r12,r2\n\ + mov.l @(r0,r12),r0\n\ + bra 2f\n\ + sub r0,r2\n\ + .align 2\n\ + 1: .long _dl_start@GOT\n\ + 3: .long _dl_start@GOTOFF\n\ + 2: mov r2,%0" + : "=r" (addr) : : "r0", "r1", "r2"); + return addr; +} + + +/* Set up the loaded object described by L so its unrelocated PLT + entries will jump to the on-demand fixup code in dl-runtime.c. */ + +static inline int __attribute__ ((unused, always_inline)) +elf_machine_runtime_setup (struct link_map *l, int lazy, int profile) +{ + Elf32_Addr *got; + extern void _dl_runtime_resolve (Elf32_Word); + extern void _dl_runtime_profile (Elf32_Word); + + if (l->l_info[DT_JMPREL] && lazy) + { + /* The GOT entries for functions in the PLT have not yet been filled + in. Their initial contents will arrange when called to load an + offset into the .rela.plt section and _GLOBAL_OFFSET_TABLE_[1], + and then jump to _GLOBAL_OFFSET_TABLE[2]. */ + got = (Elf32_Addr *) D_PTR (l, l_info[DT_PLTGOT]); + /* If a library is prelinked but we have to relocate anyway, + we have to be able to undo the prelinking of .got.plt. + The prelinker saved us here address of .plt + 36. */ + if (got[1]) + { + l->l_mach.plt = got[1] + l->l_addr; + l->l_mach.gotplt = (Elf32_Addr) &got[3]; + } + got[1] = (Elf32_Addr) l; /* Identify this shared object. */ + + /* The got[2] entry contains the address of a function which gets + called to get the address of a so far unresolved function and + jump to it. The profiling extension of the dynamic linker allows + to intercept the calls to collect information. In this case we + don't store the address in the GOT so that all future calls also + end in this function. */ + if (profile) + { + got[2] = (Elf32_Addr) &_dl_runtime_profile; + /* Say that we really want profiling and the timers are started. */ + if (GLRO(dl_profile) != NULL + && _dl_name_match_p (GLRO(dl_profile), l)) + GL(dl_profile_map) = l; + } + else + /* This function will get called to fix up the GOT entry indicated by + the offset on the stack, and then jump to the resolved address. */ + got[2] = (Elf32_Addr) &_dl_runtime_resolve; + } + return lazy; +} + +#define ELF_MACHINE_RUNTIME_FIXUP_ARGS int plt_type +#define ELF_MACHINE_RUNTIME_FIXUP_PARAMS plt_type + +/* Mask identifying addresses reserved for the user program, + where the dynamic linker should not map anything. */ +#define ELF_MACHINE_USER_ADDRESS_MASK 0x80000000UL + +/* Initial entry point code for the dynamic linker. + The C function `_dl_start' is the real entry point; + its return value is the user program's entry point. */ + +#define RTLD_START asm ("\ +.text\n\ +.globl _start\n\ +.globl _dl_start_user\n\ +_start:\n\ + mov r15,r4\n\ + mov.l .L_dl_start,r1\n\ + mova .L_dl_start,r0\n\ + add r1,r0\n\ + jsr @r0\n\ + nop\n\ +_dl_start_user:\n\ + ! Save the user entry point address in r8.\n\ + mov r0,r8\n\ + ! Point r12 at the GOT.\n\ + mov.l 1f,r12\n\ + mova 1f,r0\n\ + bra 2f\n\ + add r0,r12\n\ + .align 2\n\ +1: .long _GLOBAL_OFFSET_TABLE_\n\ +2: ! See if we were run as a command with the executable file\n\ + ! name as an extra leading argument.\n\ + mov.l .L_dl_skip_args,r0\n\ + mov.l @(r0,r12),r0\n\ + mov.l @r0,r0\n\ + ! Get the original argument count.\n\ + mov.l @r15,r5\n\ + ! Subtract _dl_skip_args from it.\n\ + sub r0,r5\n\ + ! Adjust the stack pointer to skip _dl_skip_args words.\n\ + shll2 r0\n\ + add r0,r15\n\ + ! Store back the modified argument count.\n\ + mov.l r5,@r15\n\ + ! Compute argv address and envp.\n\ + mov r15,r6\n\ + add #4,r6\n\ + mov r5,r7\n\ + shll2 r7\n\ + add r15,r7\n\ + add #8,r7\n\ + mov.l .L_dl_loaded,r0\n\ + mov.l @(r0,r12),r0\n\ + mov.l @r0,r4\n\ + ! Call _dl_init.\n\ + mov.l .L_dl_init,r1\n\ + mova .L_dl_init,r0\n\ + add r1,r0\n\ + jsr @r0\n\ + nop\n\ +1: ! Pass our finalizer function to the user in r4, as per ELF ABI.\n\ + mov.l .L_dl_fini,r0\n\ + mov.l @(r0,r12),r4\n\ + ! Jump to the user's entry point.\n\ + jmp @r8\n\ + nop\n\ + .align 2\n\ +.L_dl_start:\n\ + .long _dl_start@PLT\n\ +.L_dl_skip_args:\n\ + .long _dl_skip_args@GOT\n\ +.L_dl_init:\n\ + .long _dl_init@PLT\n\ +.L_dl_loaded:\n\ + .long _rtld_local@GOT\n\ +.L_dl_fini:\n\ + .long _dl_fini@GOT\n\ + .type __fpscr_values,@object\n\ + .global __fpscr_values\n\ +__fpscr_values:\n\ + .long 0\n\ + .long 0x80000\n\ + .weak __fpscr_values\n\ +.previous\n\ +"); + +/* ELF_RTYPE_CLASS_PLT iff TYPE describes relocation of a PLT entry or + TLS variable, so undefined references should not be allowed to + define the value. + ELF_RTYPE_CLASS_COPY iff TYPE should not be allowed to resolve to one + of the main executable's symbols, as for a COPY reloc. */ +#define elf_machine_type_class(type) \ + ((((type) == R_SH_JMP_SLOT || (type) == R_SH_TLS_DTPMOD32 \ + || (type) == R_SH_TLS_DTPOFF32 || (type) == R_SH_TLS_TPOFF32) \ + * ELF_RTYPE_CLASS_PLT) \ + | (((type) == R_SH_COPY) * ELF_RTYPE_CLASS_COPY)) + +/* A reloc type used for ld.so cmdline arg lookups to reject PLT entries. */ +#define ELF_MACHINE_JMP_SLOT R_SH_JMP_SLOT + +/* We define an initialization functions. This is called very early in + _dl_sysdep_start. */ +#define DL_PLATFORM_INIT dl_platform_init () + +static inline void __attribute__ ((unused)) +dl_platform_init (void) +{ + if (GLRO(dl_platform) != NULL && *GLRO(dl_platform) == '\0') + /* Avoid an empty string which would disturb us. */ + GLRO(dl_platform) = NULL; +} + +static inline Elf32_Addr +elf_machine_fixup_plt (struct link_map *map, lookup_t t, + const Elf32_Rela *reloc, + Elf32_Addr *reloc_addr, Elf32_Addr value) +{ + return *reloc_addr = value; +} + +/* Return the final value of a plt relocation. */ +static inline Elf32_Addr +elf_machine_plt_value (struct link_map *map, const Elf32_Rela *reloc, + Elf32_Addr value) +{ + return value + reloc->r_addend; +} + +#define ARCH_LA_PLTENTER sh_gnu_pltenter +#define ARCH_LA_PLTEXIT sh_gnu_pltexit + +#endif /* !dl_machine_h */ + +/* SH never uses Elf32_Rel relocations. */ +#define ELF_MACHINE_NO_REL 1 +#define ELF_MACHINE_NO_RELA 0 + +#ifdef RESOLVE_MAP + +/* Perform the relocation specified by RELOC and SYM (which is fully resolved). + MAP is the object containing the reloc. */ + +auto inline void +__attribute ((always_inline)) +elf_machine_rela (struct link_map *map, const Elf32_Rela *reloc, + const Elf32_Sym *sym, const struct r_found_version *version, + void *const reloc_addr_arg, int skip_ifunc) +{ + Elf32_Addr *const reloc_addr = reloc_addr_arg; + const unsigned int r_type = ELF32_R_TYPE (reloc->r_info); + Elf32_Addr value; + +#define COPY_UNALIGNED_WORD(swp, twp, align) \ + { \ + void *__s = (swp), *__t = (twp); \ + unsigned char *__s1 = __s, *__t1 = __t; \ + unsigned short *__s2 = __s, *__t2 = __t; \ + unsigned long *__s4 = __s, *__t4 = __t; \ + switch ((align)) \ + { \ + case 0: \ + *__t4 = *__s4; \ + break; \ + case 2: \ + *__t2++ = *__s2++; \ + *__t2 = *__s2; \ + break; \ + default: \ + *__t1++ = *__s1++; \ + *__t1++ = *__s1++; \ + *__t1++ = *__s1++; \ + *__t1 = *__s1; \ + break; \ + } \ + } + + if (__glibc_unlikely (r_type == R_SH_RELATIVE)) + { +#ifndef RTLD_BOOTSTRAP + if (map != &GL(dl_rtld_map)) /* Already done in rtld itself. */ +#endif + { + if (reloc->r_addend) + value = map->l_addr + reloc->r_addend; + else + { + COPY_UNALIGNED_WORD (reloc_addr_arg, &value, + (int) reloc_addr_arg & 3); + value += map->l_addr; + } + COPY_UNALIGNED_WORD (&value, reloc_addr_arg, + (int) reloc_addr_arg & 3); + } + } +#ifndef RTLD_BOOTSTRAP + else if (__glibc_unlikely (r_type == R_SH_NONE)) + return; +#endif + else + { + const Elf32_Sym *const refsym = sym; + struct link_map *sym_map = RESOLVE_MAP (&sym, version, r_type); + + value = sym_map == NULL ? 0 : sym_map->l_addr + sym->st_value; + value += reloc->r_addend; + + switch (r_type) + { + case R_SH_COPY: + if (sym == NULL) + /* This can happen in trace mode if an object could not be + found. */ + break; + if (sym->st_size > refsym->st_size + || (sym->st_size < refsym->st_size && GLRO(dl_verbose))) + { + const char *strtab; + + strtab = (const char *) D_PTR (map, l_info[DT_STRTAB]); + _dl_error_printf ("\ +%s: Symbol `%s' has different size in shared object, consider re-linking\n", + RTLD_PROGNAME, strtab + refsym->st_name); + } + memcpy (reloc_addr_arg, (void *) value, + MIN (sym->st_size, refsym->st_size)); + break; + case R_SH_GLOB_DAT: + case R_SH_JMP_SLOT: + /* These addresses are always aligned. */ + *reloc_addr = value; + break; + /* XXX Remove TLS relocations which are not needed. */ + case R_SH_TLS_DTPMOD32: +#ifdef RTLD_BOOTSTRAP + /* During startup the dynamic linker is always the module + with index 1. + XXX If this relocation is necessary move before RESOLVE + call. */ + *reloc_addr = 1; +#else + /* Get the information from the link map returned by the + resolv function. */ + if (sym_map != NULL) + *reloc_addr = sym_map->l_tls_modid; +#endif + break; + case R_SH_TLS_DTPOFF32: +#ifndef RTLD_BOOTSTRAP + /* During relocation all TLS symbols are defined and used. + Therefore the offset is already correct. */ + if (sym != NULL) + *reloc_addr = sym->st_value; +#endif + break; + case R_SH_TLS_TPOFF32: + /* The offset is positive, afterward from the thread pointer. */ +#ifdef RTLD_BOOTSTRAP + *reloc_addr = map->l_tls_offset + sym->st_value + reloc->r_addend; +#else + /* We know the offset of object the symbol is contained in. + It is a positive value which will be added to the thread + pointer. To get the variable position in the TLS block + we add the offset from that of the TLS block. */ + if (sym != NULL) + { + CHECK_STATIC_TLS (map, sym_map); + *reloc_addr = sym_map->l_tls_offset + sym->st_value + + reloc->r_addend; + } +#endif + break; + case R_SH_DIR32: + { +#if !defined RTLD_BOOTSTRAP && !defined RESOLVE_CONFLICT_FIND_MAP + /* This is defined in rtld.c, but nowhere in the static + libc.a; make the reference weak so static programs can + still link. This declaration cannot be done when + compiling rtld.c (i.e. #ifdef RTLD_BOOTSTRAP) because + rtld.c contains the common defn for _dl_rtld_map, which + is incompatible with a weak decl in the same file. */ +# ifndef SHARED + weak_extern (_dl_rtld_map); +# endif + if (map == &GL(dl_rtld_map)) + /* Undo the relocation done here during bootstrapping. + Now we will relocate it anew, possibly using a + binding found in the user program or a loaded library + rather than the dynamic linker's built-in definitions + used while loading those libraries. */ + value -= map->l_addr + refsym->st_value + reloc->r_addend; +#endif + COPY_UNALIGNED_WORD (&value, reloc_addr_arg, + (int) reloc_addr_arg & 3); + break; + } + case R_SH_REL32: + value = (value - (Elf32_Addr) reloc_addr); + COPY_UNALIGNED_WORD (&value, reloc_addr_arg, + (int) reloc_addr_arg & 3); + break; + default: + _dl_reloc_bad_type (map, r_type, 0); + break; + } + } +} + +auto inline void +__attribute__ ((always_inline)) +elf_machine_rela_relative (Elf32_Addr l_addr, const Elf32_Rela *reloc, + void *const reloc_addr_arg) +{ + Elf32_Addr value; + + if (reloc->r_addend) + value = l_addr + reloc->r_addend; + else + { + COPY_UNALIGNED_WORD (reloc_addr_arg, &value, (int) reloc_addr_arg & 3); + value += l_addr; + } + COPY_UNALIGNED_WORD (&value, reloc_addr_arg, (int) reloc_addr_arg & 3); + +#undef COPY_UNALIGNED_WORD +} + +auto inline void +__attribute__ ((always_inline)) +elf_machine_lazy_rel (struct link_map *map, + Elf32_Addr l_addr, const Elf32_Rela *reloc, + int skip_ifunc) +{ + Elf32_Addr *const reloc_addr = (void *) (l_addr + reloc->r_offset); + /* Check for unexpected PLT reloc type. */ + if (ELF32_R_TYPE (reloc->r_info) == R_SH_JMP_SLOT) + { + if (__builtin_expect (map->l_mach.plt, 0) == 0) + *reloc_addr += l_addr; + else + *reloc_addr = + map->l_mach.plt + + (((Elf32_Addr) reloc_addr) - map->l_mach.gotplt) * 7; + } + else + _dl_reloc_bad_type (map, ELF32_R_TYPE (reloc->r_info), 1); +} + +#endif /* RESOLVE_MAP */ |