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Diffstat (limited to 'sysdeps/sparc64/dl-machine.h')
| -rw-r--r-- | sysdeps/sparc64/dl-machine.h | 304 |
1 files changed, 304 insertions, 0 deletions
diff --git a/sysdeps/sparc64/dl-machine.h b/sysdeps/sparc64/dl-machine.h new file mode 100644 index 0000000000..21c3d6b9bd --- /dev/null +++ b/sysdeps/sparc64/dl-machine.h @@ -0,0 +1,304 @@ +/* Machine-dependent ELF dynamic relocation inline functions. Sparc64 version. + Copyright (C) 1997 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 Library General Public License as + published by the Free Software Foundation; either version 2 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 + Library General Public License for more details. + + You should have received a copy of the GNU Library General Public + License along with the GNU C Library; see the file COPYING.LIB. If + not, write to the Free Software Foundation, Inc., + 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ + +#define ELF_MACHINE_NAME "sparc64" + +#include <assert.h> +#include <string.h> +#include <link.h> +#include <sys/param.h> +#include <sysdep.h> + + +/* Return nonzero iff E_MACHINE is compatible with the running host. */ +static inline int +elf_machine_matches_host (Elf64_Half e_machine) +{ + return e_machine == EM_SPARC64; +} + + +/* 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 Elf64_Addr +elf_machine_dynamic (void) +{ + register Elf64_Addr *got asm ("%l7"); + return *got; +} + + +/* Return the run-time load address of the shared object. */ +static inline Elf64_Addr +elf_machine_load_address (void) +{ + Elf64_Addr here; + + __asm("rd %pc,%0\n\t" + "ba 1f\n\t" + " add %0,12,%0\n\t" + ".weak __load_address_undefined\n\t" + "call __load_address_undefined\n" + "1:" + : "=r"(here)); + + return here + (*(int *)here << 2); +} + +#ifdef RESOLVE +/* Perform the relocation specified by RELOC and SYM (which is fully resolved). + MAP is the object containing the reloc. */ + +static inline void +elf_machine_rela (struct link_map *map, const Elf64_Rela *reloc, + const Elf64_Sym *sym, const struct r_found_version *version) +{ + Elf64_Addr *const reloc_addr = (void *) (map->l_addr + reloc->r_offset); + Elf64_Addr loadbase; + +#ifndef RTLD_BOOTSTRAP + /* 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 (ELF64_R_TYPE (reloc->r_info) == R_SPARC_RELATIVE) + { +#ifndef RTLD_BOOTSTRAP + if (map != &_dl_rtld_map) /* Already done in rtld itself. */ +#endif + *reloc_addr += map->l_addr + reloc->r_addend; + } + else + { + const Elf64_Sym *const refsym = sym; + Elf64_Addr value; + if (sym->st_shndx != SHN_UNDEF && + ELF64_ST_BIND (sym->st_info) == STB_LOCAL) + value = map->l_addr; + else + { + value = RESOLVE (&sym, version, ELF64_R_TYPE (reloc->r_info)); + if (sym) + value += sym->st_value; + } + value += reloc->r_addend; /* Assume copy relocs have zero addend. */ + + switch (ELF64_R_TYPE (reloc->r_info)) + { + case R_SPARC_COPY: + if (sym->st_size > refsym->st_size + || (_dl_verbose && sym->st_size < refsym->st_size)) + { + const char *strtab; + + strtab = ((void *) map->l_addr + + map->l_info[DT_STRTAB]->d_un.d_ptr); + _dl_sysdep_error ("Symbol `", strtab + refsym->st_name, + "' has different size in shared object, " + "consider re-linking\n", NULL); + } + memcpy (reloc_addr, (void *) value, MIN (sym->st_size, + refsym->st_size)); + break; + case R_SPARC_GLOB_DAT: + /* case R_SPARC_64: */ + case R_SPARC_JMP_SLOT: + *reloc_addr = value; + break; + 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 - (Elf64_Addr) reloc_addr); + break; + case R_SPARC_DISP16: + *(short *) reloc_addr = (value - (Elf64_Addr) reloc_addr); + break; + case R_SPARC_DISP32: + *(unsigned int *)reloc_addr = (value - (Elf64_Addr) reloc_addr); + break; + case R_SPARC_LO10: + *(unsigned *)reloc_addr = (*(unsigned *)reloc_addr & ~0x3ff) + | (value & 0x3ff); + break; + case R_SPARC_WDISP30: + *(unsigned *)reloc_addr = ((*(unsigned *)reloc_addr & 0xc0000000) + | ((value - (Elf64_Addr) reloc_addr) >> 2)); + break; + case R_SPARC_HI22: + *(unsigned *)reloc_addr = (*(unsigned *)reloc_addr & 0xffc00000) + | (value >> 10); + break; + case R_SPARC_NONE: /* Alright, Wilbur. */ + break; + default: + assert (! "unexpected dynamic reloc type"); + break; + } + } +} + +static inline void +elf_machine_lazy_rel (struct link_map *map, const Elf64_Rela *reloc) +{ + switch (ELF64_R_TYPE (reloc->r_info)) + { + case R_SPARC_NONE: + break; + case R_SPARC_JMP_SLOT: + break; + default: + assert (! "unexpected PLT reloc type"); + break; + } +} + +#endif /* RESOLVE */ + +/* Nonzero iff TYPE should not be allowed to resolve to one of + the main executable's symbols, as for a COPY reloc. */ +#define elf_machine_lookup_noexec_p(type) ((type) == R_SPARC_COPY) + +/* Nonzero iff TYPE describes relocation of a PLT entry, so + PLT entries should not be allowed to define the value. */ +#define elf_machine_lookup_noplt_p(type) ((type) == R_SPARC_JMP_SLOT) + +/* A reloc type used for ld.so cmdline arg lookups to reject PLT entries. */ +#define ELF_MACHINE_RELOC_NOPLT R_SPARC_JMP_SLOT + +/* The SPARC never uses Elf64_Rel relocations. */ +#define ELF_MACHINE_NO_REL 1 + + +/* 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) +{ + Elf64_Addr *got; + extern void _dl_runtime_resolve (Elf64_Word); + + if (l->l_info[DT_JMPREL] && lazy) + { + got = (Elf64_Addr *) (l->l_addr + l->l_info[DT_PLTGOT]->d_un.d_ptr); + got[1] = (Elf64_Addr) l; /* Identify this shared object. */ + /* 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] = (Elf64_Addr) &_dl_runtime_resolve; + } + + return lazy; +} + +/* This code is used in dl-runtime.c to call the `fixup' function + and then redirect to the address it returns. */ +#define ELF_MACHINE_RUNTIME_TRAMPOLINE asm ("\ + .globl _dl_runtime_resolve + .type _dl_runtime_resolve, @function +_dl_runtime_resolve: + save %sp, -160, %sp + mov %g1, %o1 + call fixup + mov %g2, %o0 + jmp %o0 + restore + .size _dl_runtime_resolve, .-_dl_runtime_resolve +"); + +/* The PLT uses Elf64_Rela relocs. */ +#define elf_machine_relplt elf_machine_rela + + +/* Mask identifying addresses reserved for the user program, + where the dynamic linker should not map anything. */ +#define ELF_MACHINE_USER_ADDRESS_MASK ??? + +/* 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 __S1(x) #x +#define __S(x) __S1(x) + +#define RTLD_START __asm__ ( "\ + .global _start + .type _start, @function +_start: + /* Make room for functions to drop their arguments on the stack. */ + sub %sp, 6*8, %sp + /* Pass pointer to argument block to _dl_start. */ + call _dl_start + add %sp," __S(STACK_BIAS) "+22*8,%o0 + /* FALLTHRU */ + + .global _dl_start_user + .type _dl_start_user, @function +_dl_start_user: + /* Load the GOT register. */ +1: rd %pc,%g1 + sethi %hi(_GLOBAL_OFFSET_TABLE_-(1b-.)),%l7 + or %l2,%lo(_GLOBAL_OFFSET_TABLE_-(1b-.)),%l7 + add %l7,%g1,%l7 + /* Save the user entry point address in %l0. */ + mov %o0,%l0 + /* See if we were run as a command with the executable file name as an + extra leading argument. If so, adjust the stack pointer. */ + sethi %hi(_dl_skip_args), %g2 + or %g2, %lo(_dl_skip_args), %g2 + ld [%l7+%g2], %i0 + brz,pt %i0, 2f + ldx [%sp+" __S(STACK_BIAS) "+22*8], %i1 + sub %i1, %i0, %i1 + sllx %i0, 3, %i2 + add %sp, %i2, %sp + stx %i1, [%sp+" __S(STACK_BIAS) "+22*8] + /* Load _dl_default_scope[2] to pass to _dl_init_next. */ +2: sethi %hi(_dl_default_scope), %g2 + or %g2, %lo(_dl_defalt_scope), %g2 + add %g2, 2*8, %g2 + ldx [%l7+%g2], %l1 + /* Call _dl_init_next to return the address of an initializer to run. */ +3: call _dl_init_next + mov %l1, %o0 + brz,pn %o0, 4f + nop + jmpl %o0, %o7 + nop + ba,a 3b + /* Clear the startup flag. */ +4: sethi %hi(_dl_starting_up), %g2 + or %g2, %lo(_dl_starting_up), %g2 + st %g0, [%l7+%g2] + /* Pass our finalizer function to the user in %g1 + sethi %hi(_dl_fini), %g1 + or %g1, %lo(_dl_fini), %g1 + ldx [%l7+%g1], %g1 + /* Jump to the user's entry point & undo the allocation of the xtra regs. */ + jmp %l0 + add %sp, 6*8, %sp + .size _dl_start_user, .-_dl_start_user"); |