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Diffstat (limited to 'REORG.TODO/sysdeps/sparc/sparc32/dl-machine.h')
| -rw-r--r-- | REORG.TODO/sysdeps/sparc/sparc32/dl-machine.h | 568 |
1 files changed, 568 insertions, 0 deletions
diff --git a/REORG.TODO/sysdeps/sparc/sparc32/dl-machine.h b/REORG.TODO/sysdeps/sparc/sparc32/dl-machine.h new file mode 100644 index 0000000000..95f673270e --- /dev/null +++ b/REORG.TODO/sysdeps/sparc/sparc32/dl-machine.h @@ -0,0 +1,568 @@ +/* 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 */ |