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Diffstat (limited to 'sysdeps/sparc/sparc32/dl-machine.h')
| -rw-r--r-- | sysdeps/sparc/sparc32/dl-machine.h | 568 |
1 files changed, 0 insertions, 568 deletions
diff --git a/sysdeps/sparc/sparc32/dl-machine.h b/sysdeps/sparc/sparc32/dl-machine.h deleted file mode 100644 index 95f673270e..0000000000 --- a/sysdeps/sparc/sparc32/dl-machine.h +++ /dev/null @@ -1,568 +0,0 @@ -/* Machine-dependent ELF dynamic relocation inline functions. SPARC version. - Copyright (C) 1996-2017 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 "sparc" - -#include <string.h> -#include <sys/param.h> -#include <ldsodefs.h> -#include <sysdep.h> -#include <tls.h> -#include <dl-plt.h> -#include <elf/dl-hwcaps.h> - -/* Return nonzero iff ELF header is compatible with the running host. */ -static inline int -elf_machine_matches_host (const Elf32_Ehdr *ehdr) -{ - if (ehdr->e_machine == EM_SPARC) - return 1; - else if (ehdr->e_machine == EM_SPARC32PLUS) - { -#if HAVE_TUNABLES || defined SHARED - uint64_t hwcap_mask = GET_HWCAP_MASK(); - return GLRO(dl_hwcap) & hwcap_mask & HWCAP_SPARC_V9; -#else - return GLRO(dl_hwcap) & HWCAP_SPARC_V9; -#endif - } - else - return 0; -} - -/* We have to do this because elf_machine_{dynamic,load_address} can be - invoked from functions that have no GOT references, and thus the compiler - has no obligation to load the PIC register. */ -#define LOAD_PIC_REG(PIC_REG) \ -do { register Elf32_Addr pc __asm("o7"); \ - __asm("sethi %%hi(_GLOBAL_OFFSET_TABLE_-4), %1\n\t" \ - "call 1f\n\t" \ - "add %1, %%lo(_GLOBAL_OFFSET_TABLE_+4), %1\n" \ - "1:\tadd %1, %0, %1" \ - : "=r" (pc), "=r" (PIC_REG)); \ -} while (0) - -/* 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 -elf_machine_dynamic (void) -{ - register Elf32_Addr *got asm ("%l7"); - - LOAD_PIC_REG (got); - - return *got; -} - -/* Return the run-time load address of the shared object. */ -static inline Elf32_Addr -elf_machine_load_address (void) -{ - register Elf32_Addr *pc __asm ("%o7"), *got __asm ("%l7"); - - __asm ("sethi %%hi(_GLOBAL_OFFSET_TABLE_-4), %1\n\t" - "call 1f\n\t" - " add %1, %%lo(_GLOBAL_OFFSET_TABLE_+4), %1\n\t" - "call _DYNAMIC\n\t" - "call _GLOBAL_OFFSET_TABLE_\n" - "1:\tadd %1, %0, %1\n\t" : "=r" (pc), "=r" (got)); - - /* got is now l_addr + _GLOBAL_OFFSET_TABLE_ - *got is _DYNAMIC - pc[2]*4 is l_addr + _DYNAMIC - (long)pc - 8 - pc[3]*4 is l_addr + _GLOBAL_OFFSET_TABLE_ - (long)pc - 12 */ - return (Elf32_Addr) got - *got + (pc[2] - pc[3]) * 4 - 4; -} - -/* 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 -elf_machine_runtime_setup (struct link_map *l, int lazy, int profile) -{ - Elf32_Addr *plt; - extern void _dl_runtime_resolve (Elf32_Word); - extern void _dl_runtime_profile (Elf32_Word); - - if (l->l_info[DT_JMPREL] && lazy) - { - Elf32_Addr rfunc; - - /* The entries for functions in the PLT have not yet been filled in. - Their initial contents will arrange when called to set the high 22 - bits of %g1 with an offset into the .rela.plt section and jump to - the beginning of the PLT. */ - plt = (Elf32_Addr *) D_PTR (l, l_info[DT_PLTGOT]); - if (__builtin_expect(profile, 0)) - { - rfunc = (Elf32_Addr) &_dl_runtime_profile; - - if (GLRO(dl_profile) != NULL - && _dl_name_match_p (GLRO(dl_profile), l)) - GL(dl_profile_map) = l; - } - else - { - rfunc = (Elf32_Addr) &_dl_runtime_resolve; - } - - /* The beginning of the PLT does: - - sethi %hi(_dl_runtime_{resolve,profile}), %g2 - pltpc: jmpl %g2 + %lo(_dl_runtime_{resolve,profile}), %g2 - nop - .word MAP - - The PC value (pltpc) saved in %g2 by the jmpl points near the - location where we store the link_map pointer for this object. */ - - plt[0] = 0x05000000 | ((rfunc >> 10) & 0x003fffff); - plt[1] = 0x85c0a000 | (rfunc & 0x3ff); - plt[2] = OPCODE_NOP; /* Fill call delay slot. */ - plt[3] = (Elf32_Addr) l; - if (__builtin_expect (l->l_info[VALIDX(DT_GNU_PRELINKED)] != NULL, 0) - || __builtin_expect (l->l_info [VALIDX (DT_GNU_LIBLISTSZ)] != NULL, 0)) - { - /* Need to reinitialize .plt to undo prelinking. */ - Elf32_Rela *rela = (Elf32_Rela *) D_PTR (l, l_info[DT_JMPREL]); - Elf32_Rela *relaend - = (Elf32_Rela *) ((char *) rela - + l->l_info[DT_PLTRELSZ]->d_un.d_val); -#if !defined RTLD_BOOTSTRAP && !defined __sparc_v9__ - /* Note that we don't mask the hwcap here, as the flush is - essential to functionality on those cpu's that implement it. - For sparcv9 we can assume flush is present. */ - const int do_flush = GLRO(dl_hwcap) & HWCAP_SPARC_FLUSH; -#else - const int do_flush = 1; -#endif - - /* prelink must ensure there are no R_SPARC_NONE relocs left - in .rela.plt. */ - while (rela < relaend) - { - *(unsigned int *) (rela->r_offset + l->l_addr) - = OPCODE_SETHI_G1 | (rela->r_offset + l->l_addr - - (Elf32_Addr) plt); - *(unsigned int *) (rela->r_offset + l->l_addr + 4) - = OPCODE_BA | ((((Elf32_Addr) plt - - rela->r_offset - l->l_addr - 4) >> 2) - & 0x3fffff); - if (do_flush) - { - __asm __volatile ("flush %0" : : "r" (rela->r_offset - + l->l_addr)); - __asm __volatile ("flush %0+4" : : "r" (rela->r_offset - + l->l_addr)); - } - ++rela; - } - } - } - - return lazy; -} - -/* ELF_RTYPE_CLASS_PLT iff TYPE describes relocation of a PLT entry, so - PLT entries 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_SPARC_JMP_SLOT \ - || ((type) >= R_SPARC_TLS_GD_HI22 && (type) <= R_SPARC_TLS_TPOFF64)) \ - * ELF_RTYPE_CLASS_PLT) \ - | (((type) == R_SPARC_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_SPARC_JMP_SLOT - -/* The SPARC never uses Elf32_Rel relocations. */ -#define ELF_MACHINE_NO_REL 1 -#define ELF_MACHINE_NO_RELA 0 - -/* Undo the sub %sp, 6*4, %sp; add %sp, 22*4, %o0 below to get at the - value we want in __libc_stack_end. */ -#define DL_STACK_END(cookie) \ - ((void *) (((long) (cookie)) - (22 - 6) * 4)) - -/* 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_GOT_ADDRESS(pic_reg, reg, symbol) \ - "sethi %gdop_hix22(" #symbol "), " #reg "\n\t" \ - "xor " #reg ", %gdop_lox10(" #symbol "), " #reg "\n\t" \ - "ld [" #pic_reg " + " #reg "], " #reg ", %gdop(" #symbol ")" - -#define RTLD_START __asm__ ("\ - .text\n\ - .globl _start\n\ - .type _start, @function\n\ - .align 32\n\ -_start:\n\ - /* Allocate space for functions to drop their arguments. */\n\ - sub %sp, 6*4, %sp\n\ - /* Pass pointer to argument block to _dl_start. */\n\ - call _dl_start\n\ - add %sp, 22*4, %o0\n\ - /* FALTHRU */\n\ - .globl _dl_start_user\n\ - .type _dl_start_user, @function\n\ -_dl_start_user:\n\ - /* Load the PIC register. */\n\ -1: call 2f\n\ - sethi %hi(_GLOBAL_OFFSET_TABLE_-(1b-.)), %l7\n\ -2: or %l7, %lo(_GLOBAL_OFFSET_TABLE_-(1b-.)), %l7\n\ - add %l7, %o7, %l7\n\ - /* Save the user entry point address in %l0 */\n\ - mov %o0, %l0\n\ - /* See if we were run as a command with the executable file name as an\n\ - extra leading argument. If so, adjust the contents of the stack. */\n\ - " RTLD_GOT_ADDRESS(%l7, %g2, _dl_skip_args) "\n\ - ld [%g2], %i0\n\ - tst %i0\n\ - beq 3f\n\ - ld [%sp+22*4], %i5 /* load argc */\n\ - /* Find out how far to shift. */\n\ - " RTLD_GOT_ADDRESS(%l7, %l3, _dl_argv) "\n\ - sub %i5, %i0, %i5\n\ - ld [%l3], %l4\n\ - sll %i0, 2, %i2\n\ - st %i5, [%sp+22*4]\n\ - sub %l4, %i2, %l4\n\ - add %sp, 23*4, %i1\n\ - add %i1, %i2, %i2\n\ - st %l4, [%l3]\n\ - /* Copy down argv */\n\ -21: ld [%i2], %i3\n\ - add %i2, 4, %i2\n\ - tst %i3\n\ - st %i3, [%i1]\n\ - bne 21b\n\ - add %i1, 4, %i1\n\ - /* Copy down env */\n\ -22: ld [%i2], %i3\n\ - add %i2, 4, %i2\n\ - tst %i3\n\ - st %i3, [%i1]\n\ - bne 22b\n\ - add %i1, 4, %i1\n\ - /* Copy down auxiliary table. */\n\ -23: ld [%i2], %i3\n\ - ld [%i2+4], %i4\n\ - add %i2, 8, %i2\n\ - tst %i3\n\ - st %i3, [%i1]\n\ - st %i4, [%i1+4]\n\ - bne 23b\n\ - add %i1, 8, %i1\n\ - /* %o0 = _dl_loaded, %o1 = argc, %o2 = argv, %o3 = envp. */\n\ -3: " RTLD_GOT_ADDRESS(%l7, %o0, _rtld_local) "\n\ - add %sp, 23*4, %o2\n\ - sll %i5, 2, %o3\n\ - add %o3, 4, %o3\n\ - mov %i5, %o1\n\ - add %o2, %o3, %o3\n\ - call _dl_init\n\ - ld [%o0], %o0\n\ - /* Pass our finalizer function to the user in %g1. */\n\ - " RTLD_GOT_ADDRESS(%l7, %g1, _dl_fini) "\n\ - /* Jump to the user's entry point and deallocate the extra stack we got. */\n\ - jmp %l0\n\ - add %sp, 6*4, %sp\n\ - .size _dl_start_user, . - _dl_start_user\n\ - .previous"); - -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) -{ -#ifdef __sparc_v9__ - /* Sparc v9 can assume flush is always present. */ - const int do_flush = 1; -#else - /* Note that we don't mask the hwcap here, as the flush is essential to - functionality on those cpu's that implement it. */ - const int do_flush = GLRO(dl_hwcap) & HWCAP_SPARC_FLUSH; -#endif - return sparc_fixup_plt (reloc, reloc_addr, value, 1, do_flush); -} - -/* 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; -} - -#endif /* dl_machine_h */ - -#define ARCH_LA_PLTENTER sparc32_gnu_pltenter -#define ARCH_LA_PLTEXIT sparc32_gnu_pltexit - -#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; -#if !defined RTLD_BOOTSTRAP && !defined RESOLVE_CONFLICT_FIND_MAP - const Elf32_Sym *const refsym = sym; -#endif - Elf32_Addr value; - const unsigned int r_type = ELF32_R_TYPE (reloc->r_info); -#if !defined RESOLVE_CONFLICT_FIND_MAP - struct link_map *sym_map = NULL; -#endif - -#if !defined RTLD_BOOTSTRAP && !defined HAVE_Z_COMBRELOC - /* 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. */ - weak_extern (_dl_rtld_map); -#endif - - if (__glibc_unlikely (r_type == R_SPARC_NONE)) - return; - - if (__glibc_unlikely (r_type == R_SPARC_SIZE32)) - { - *reloc_addr = sym->st_size + reloc->r_addend; - return; - } - -#if !defined RTLD_BOOTSTRAP || !defined HAVE_Z_COMBRELOC - if (__glibc_unlikely (r_type == R_SPARC_RELATIVE)) - { -# if !defined RTLD_BOOTSTRAP && !defined HAVE_Z_COMBRELOC - if (map != &_dl_rtld_map) /* Already done in rtld itself. */ -# endif - *reloc_addr += map->l_addr + reloc->r_addend; - return; - } -#endif - -#ifndef RESOLVE_CONFLICT_FIND_MAP - if (__builtin_expect (ELF32_ST_BIND (sym->st_info) == STB_LOCAL, 0) - && sym->st_shndx != SHN_UNDEF) - { - value = map->l_addr; - } - else - { - sym_map = RESOLVE_MAP (&sym, version, r_type); - value = sym_map == NULL ? 0 : sym_map->l_addr + sym->st_value; - } -#else - value = 0; -#endif - - value += reloc->r_addend; /* Assume copy relocs have zero addend. */ - - if (sym != NULL - && __builtin_expect (ELFW(ST_TYPE) (sym->st_info) == STT_GNU_IFUNC, 0) - && __builtin_expect (sym->st_shndx != SHN_UNDEF, 1) - && __builtin_expect (!skip_ifunc, 1)) - { - value = ((Elf32_Addr (*) (int)) value) (GLRO(dl_hwcap)); - } - - switch (r_type) - { -#if !defined RTLD_BOOTSTRAP && !defined RESOLVE_CONFLICT_FIND_MAP - case R_SPARC_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 - || (GLRO(dl_verbose) && sym->st_size < refsym->st_size)) - { - const char *strtab; - - strtab = (const void *) 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; -#endif - case R_SPARC_GLOB_DAT: - case R_SPARC_32: - *reloc_addr = value; - break; - case R_SPARC_IRELATIVE: - value = ((Elf32_Addr (*) (int)) value) (GLRO(dl_hwcap)); - *reloc_addr = value; - break; - case R_SPARC_JMP_IREL: - value = ((Elf32_Addr (*) (int)) value) (GLRO(dl_hwcap)); - /* Fall thru */ - case R_SPARC_JMP_SLOT: - { -#if !defined RTLD_BOOTSTRAP && !defined __sparc_v9__ - /* Note that we don't mask the hwcap here, as the flush is - essential to functionality on those cpu's that implement - it. For sparcv9 we can assume flush is present. */ - const int do_flush = GLRO(dl_hwcap) & HWCAP_SPARC_FLUSH; -#else - /* Unfortunately, this is necessary, so that we can ensure - ld.so will not execute corrupt PLT entry instructions. */ - const int do_flush = 1; -#endif - /* At this point we don't need to bother with thread safety, - so we can optimize the first instruction of .plt out. */ - sparc_fixup_plt (reloc, reloc_addr, value, 0, do_flush); - } - break; -#ifndef RESOLVE_CONFLICT_FIND_MAP - case R_SPARC_TLS_DTPMOD32: - /* Get the information from the link map returned by the - resolv function. */ - if (sym_map != NULL) - *reloc_addr = sym_map->l_tls_modid; - break; - case R_SPARC_TLS_DTPOFF32: - /* During relocation all TLS symbols are defined and used. - Therefore the offset is already correct. */ - *reloc_addr = (sym == NULL ? 0 : sym->st_value) + reloc->r_addend; - break; - case R_SPARC_TLS_TPOFF32: - /* The offset is negative, forward from the thread pointer. */ - /* We know the offset of object the symbol is contained in. - It is a negative value which will be added to the - thread pointer. */ - if (sym != NULL) - { - CHECK_STATIC_TLS (map, sym_map); - *reloc_addr = sym->st_value - sym_map->l_tls_offset - + reloc->r_addend; - } - break; -# ifndef RTLD_BOOTSTRAP - case R_SPARC_TLS_LE_HIX22: - case R_SPARC_TLS_LE_LOX10: - if (sym != NULL) - { - CHECK_STATIC_TLS (map, sym_map); - value = sym->st_value - sym_map->l_tls_offset - + reloc->r_addend; - if (r_type == R_SPARC_TLS_LE_HIX22) - *reloc_addr = (*reloc_addr & 0xffc00000) | ((~value) >> 10); - else - *reloc_addr = (*reloc_addr & 0xffffe000) | (value & 0x3ff) - | 0x1c00; - } - break; -# endif -#endif -#ifndef RTLD_BOOTSTRAP - case R_SPARC_8: - *(char *) reloc_addr = value; - break; - case R_SPARC_16: - *(short *) reloc_addr = value; - break; - case R_SPARC_DISP8: - *(char *) reloc_addr = (value - (Elf32_Addr) reloc_addr); - break; - case R_SPARC_DISP16: - *(short *) reloc_addr = (value - (Elf32_Addr) reloc_addr); - break; - case R_SPARC_DISP32: - *reloc_addr = (value - (Elf32_Addr) reloc_addr); - break; - case R_SPARC_LO10: - *reloc_addr = (*reloc_addr & ~0x3ff) | (value & 0x3ff); - break; - case R_SPARC_WDISP30: - *reloc_addr = ((*reloc_addr & 0xc0000000) - | ((value - (unsigned int) reloc_addr) >> 2)); - break; - case R_SPARC_HI22: - *reloc_addr = (*reloc_addr & 0xffc00000) | (value >> 10); - 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; -#endif -#if !defined RTLD_BOOTSTRAP || defined _NDEBUG - default: - _dl_reloc_bad_type (map, r_type, 0); - break; -#endif - } -} - -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 *const reloc_addr = reloc_addr_arg; - *reloc_addr += l_addr + reloc->r_addend; -} - -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); - const unsigned int r_type = ELF32_R_TYPE (reloc->r_info); - - if (__glibc_likely (r_type == R_SPARC_JMP_SLOT)) - ; - else if (r_type == R_SPARC_JMP_IREL) - { - Elf32_Addr value = map->l_addr + reloc->r_addend; - if (__glibc_likely (!skip_ifunc)) - value = ((Elf32_Addr (*) (int)) value) (GLRO(dl_hwcap)); - sparc_fixup_plt (reloc, reloc_addr, value, 1, 1); - } - else if (r_type == R_SPARC_NONE) - ; - else - _dl_reloc_bad_type (map, r_type, 1); -} - -#endif /* RESOLVE_MAP */ |