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Diffstat (limited to 'sysdeps/ia64/dl-machine.h')
| -rw-r--r-- | sysdeps/ia64/dl-machine.h | 510 |
1 files changed, 510 insertions, 0 deletions
diff --git a/sysdeps/ia64/dl-machine.h b/sysdeps/ia64/dl-machine.h new file mode 100644 index 0000000000..853e6fd349 --- /dev/null +++ b/sysdeps/ia64/dl-machine.h @@ -0,0 +1,510 @@ +/* Machine-dependent ELF dynamic relocation inline functions. IA-64 version. + Copyright (C) 1995-2014 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 1 + +#define ELF_MACHINE_NAME "ia64" + +#include <assert.h> +#include <string.h> +#include <link.h> +#include <errno.h> +#include <dl-fptr.h> +#include <tls.h> + +/* Translate a processor specific dynamic tag to the index + in l_info array. */ +#define DT_IA_64(x) (DT_IA_64_##x - DT_LOPROC + DT_NUM) + +static inline void __attribute__ ((always_inline)) +__ia64_init_bootstrap_fdesc_table (struct link_map *map) +{ + Elf64_Addr *boot_table; + + /* careful: this will be called before got has been relocated... */ + asm (";; addl %0 = @gprel (_dl_boot_fptr_table), gp" : "=r"(boot_table)); + + map->l_mach.fptr_table_len = ELF_MACHINE_BOOT_FPTR_TABLE_LEN; + map->l_mach.fptr_table = boot_table; +} + +#define ELF_MACHINE_BEFORE_RTLD_RELOC(dynamic_info) \ + __ia64_init_bootstrap_fdesc_table (&bootstrap_map); + +/* Return nonzero iff ELF header is compatible with the running host. */ +static inline int __attribute__ ((unused)) +elf_machine_matches_host (const Elf64_Ehdr *ehdr) +{ + return ehdr->e_machine == EM_IA_64; +} + + +/* Return the link-time address of _DYNAMIC. */ +static inline Elf64_Addr __attribute__ ((unused, const)) +elf_machine_dynamic (void) +{ + Elf64_Addr *p; + + __asm__ ( + ".section .sdata\n" + " .type __dynamic_ltv#, @object\n" + " .size __dynamic_ltv#, 8\n" + "__dynamic_ltv:\n" + " data8 @ltv(_DYNAMIC#)\n" + ".previous\n" + " addl %0 = @gprel(__dynamic_ltv#), gp ;;" + : "=r" (p)); + + return *p; +} + + +/* Return the run-time load address of the shared object. */ +static inline Elf64_Addr __attribute__ ((unused)) +elf_machine_load_address (void) +{ + Elf64_Addr ip; + int *p; + + __asm__ ( + "1: mov %0 = ip\n" + ".section .sdata\n" + "2: data4 @ltv(1b)\n" + " .align 8\n" + ".previous\n" + " addl %1 = @gprel(2b), gp ;;" + : "=r" (ip), "=r" (p)); + + return ip - (Elf64_Addr) *p; +} + +/* 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) +{ + extern void _dl_runtime_resolve (void); + extern void _dl_runtime_profile (void); + + if (lazy) + { + register Elf64_Addr gp __asm__ ("gp"); + Elf64_Addr *reserve, doit; + + /* + * Careful with the typecast here or it will try to add l-l_addr + * pointer elements + */ + reserve = ((Elf64_Addr *) + (l->l_info[DT_IA_64 (PLT_RESERVE)]->d_un.d_ptr + l->l_addr)); + /* Identify this shared object. */ + reserve[0] = (Elf64_Addr) l; + + /* This function will be called to perform the relocation. */ + if (!profile) + doit = (Elf64_Addr) ELF_PTR_TO_FDESC (&_dl_runtime_resolve)->ip; + else + { + if (GLRO(dl_profile) != NULL + && _dl_name_match_p (GLRO(dl_profile), l)) + { + /* This is the object we are looking for. Say that we really + want profiling and the timers are started. */ + GL(dl_profile_map) = l; + } + doit = (Elf64_Addr) ELF_PTR_TO_FDESC (&_dl_runtime_profile)->ip; + } + + reserve[1] = doit; + reserve[2] = gp; + } + + return lazy; +} + +/* Names of the architecture-specific auditing callback functions. */ +#define ARCH_LA_PLTENTER ia64_gnu_pltenter +#define ARCH_LA_PLTEXIT ia64_gnu_pltexit + +/* Undo the adds out0 = 16, sp below to get at the value we want in + __libc_stack_end. */ +#define DL_STACK_END(cookie) \ + ((void *) (((long) (cookie)) - 16)) + +/* 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" \ +" .global _start#\n" \ +" .proc _start#\n" \ +"_start:\n" \ +"0: { .mii\n" \ +" .prologue\n" \ +" .save rp, r0\n" \ +" .body\n" \ +" .prologue\n" \ +" .save ar.pfs, r32\n" \ +" alloc loc0 = ar.pfs, 0, 3, 4, 0\n" \ +" .body\n" \ +" mov r2 = ip\n" \ +" addl r3 = @gprel(0b), r0\n" \ +" ;;\n" \ +" }\n" \ +" { .mlx\n" \ +" /* Calculate the GP, and save a copy in loc1. */\n" \ +" sub gp = r2, r3\n" \ +" movl r8 = 0x9804c0270033f\n" \ +" ;;\n" \ +" }\n" \ +" { .mii\n" \ +" mov ar.fpsr = r8\n" \ +" sub loc1 = r2, r3\n" \ +" /* _dl_start wants a pointer to the pointer to the arg block and\n" \ +" the arg block starts with an integer, thus the magic 16. */\n" \ +" adds out0 = 16, sp\n" \ +" }\n" \ +" { .bbb\n" \ +" br.call.sptk.many b0 = _dl_start#\n" \ +" ;;\n" \ +" }\n" \ +" .endp _start#\n" \ +" /* FALLTHRU */\n" \ +" .global _dl_start_user#\n" \ +" .proc _dl_start_user#\n" \ +"_dl_start_user:\n" \ +" .prologue\n" \ +" .save rp, r0\n" \ +" .body\n" \ +" .prologue\n" \ +" .save ar.pfs, r32\n" \ +" .body\n" \ +" { .mii\n" \ +" addl r3 = @gprel(_dl_skip_args), gp\n" \ +" adds r11 = 24, sp /* Load the address of argv. */\n" \ +" /* Save the pointer to the user entry point fptr in loc2. */\n" \ +" mov loc2 = ret0\n" \ +" ;;\n" \ +" }\n" \ +" { .mii\n" \ +" ld4 r3 = [r3]\n" \ +" adds r10 = 16, sp /* Load the address of argc. */\n" \ +" mov out2 = r11\n" \ +" ;;\n" \ +" /* See if we were run as a command with the executable file\n" \ +" name as an extra leading argument. If so, adjust the argv\n" \ +" pointer to skip _dl_skip_args words.\n" \ +" Note that _dl_skip_args is an integer, not a long - Jes\n" \ +"\n" \ +" The stack pointer has to be 16 byte aligned. We cannot simply\n" \ +" addjust the stack pointer. We have to move the whole argv and\n" \ +" envp and adjust _dl_argv by _dl_skip_args. H.J. */\n" \ +" }\n" \ +" { .mib\n" \ +" ld8 out1 = [r10] /* is argc actually stored as a long\n" \ +" or as an int? */\n" \ +" addl r2 = @ltoff(_dl_argv), gp\n" \ +" ;;\n" \ +" }\n" \ +" { .mmi\n" \ +" ld8 r2 = [r2] /* Get the address of _dl_argv. */\n" \ +" sub out1 = out1, r3 /* Get the new argc. */\n" \ +" shladd r3 = r3, 3, r0\n" \ +" ;;\n" \ +" }\n" \ +" {\n" \ +" .mib\n" \ +" ld8 r17 = [r2] /* Get _dl_argv. */\n" \ +" add r15 = r11, r3 /* The address of the argv we move */\n" \ +" ;;\n" \ +" }\n" \ +" /* ??? Could probably merge these two loops into 3 bundles.\n" \ +" using predication to control which set of copies we're on. */\n" \ +"1: /* Copy argv. */\n" \ +" { .mfi\n" \ +" ld8 r16 = [r15], 8 /* Load the value in the old argv. */\n" \ +" ;;\n" \ +" }\n" \ +" { .mib\n" \ +" st8 [r11] = r16, 8 /* Store it in the new argv. */\n" \ +" cmp.ne p6, p7 = 0, r16\n" \ +"(p6) br.cond.dptk.few 1b\n" \ +" ;;\n" \ +" }\n" \ +" { .mmi\n" \ +" mov out3 = r11\n" \ +" sub r17 = r17, r3 /* Substract _dl_skip_args. */\n" \ +" addl out0 = @gprel(_rtld_local), gp\n" \ +" }\n" \ +"1: /* Copy env. */\n" \ +" { .mfi\n" \ +" ld8 r16 = [r15], 8 /* Load the value in the old env. */\n" \ +" ;;\n" \ +" }\n" \ +" { .mib\n" \ +" st8 [r11] = r16, 8 /* Store it in the new env. */\n" \ +" cmp.ne p6, p7 = 0, r16\n" \ +"(p6) br.cond.dptk.few 1b\n" \ +" ;;\n" \ +" }\n" \ +" { .mmb\n" \ +" st8 [r10] = out1 /* Record the new argc. */\n" \ +" ld8 out0 = [out0] /* get the linkmap */\n" \ +" }\n" \ +" { .mmb\n" \ +" st8 [r2] = r17 /* Load the new _dl_argv. */\n" \ +" br.call.sptk.many b0 = _dl_init_internal#\n" \ +" ;;\n" \ +" }\n" \ +" /* Pass our finalizer function to the user,\n" \ +" and jump to the user's entry point. */\n" \ +" { .mmi\n" \ +" ld8 r3 = [loc2], 8\n" \ +" mov b0 = r0\n" \ +" }\n" \ +" { .mmi\n" \ +" addl ret0 = @ltoff(@fptr(_dl_fini#)), gp\n" \ +" ;;\n" \ +" mov b6 = r3\n" \ +" }\n" \ +" { .mmi\n" \ +" ld8 ret0 = [ret0]\n" \ +" ld8 gp = [loc2]\n" \ +" mov ar.pfs = loc0\n" \ +" ;;\n" \ +" }\n" \ +" { .mfb\n" \ +" br.sptk.many b6\n" \ +" ;;\n" \ +" }\n" \ +" .endp _dl_start_user#\n" \ +".previous\n"); + + +#ifndef RTLD_START_SPECIAL_INIT +#define RTLD_START_SPECIAL_INIT /* nothing */ +#endif + +/* 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_NOCOPY iff TYPE should not be allowed to resolve to one + of the main executable's symbols, as for a COPY reloc, which we don't + use. */ +/* ??? Ignore *MSB for now. */ +#define elf_machine_type_class(type) \ + (((type) == R_IA64_IPLTLSB || (type) == R_IA64_DTPMOD64LSB \ + || (type) == R_IA64_DTPREL64LSB || (type) == R_IA64_TPREL64LSB) \ + * ELF_RTYPE_CLASS_PLT) + +/* A reloc type used for ld.so cmdline arg lookups to reject PLT entries. */ +#define ELF_MACHINE_JMP_SLOT R_IA64_IPLTLSB + +/* According to the IA-64 specific documentation, Rela is always used. */ +#define ELF_MACHINE_NO_REL 1 + +/* Return the address of the entry point. */ +#define ELF_MACHINE_START_ADDRESS(map, start) \ +({ \ + ElfW(Addr) addr; \ + DL_DT_FUNCTION_ADDRESS(map, start, static, addr) \ + addr; \ +}) + +/* Fixup a PLT entry to bounce directly to the function at VALUE. */ +static inline struct fdesc __attribute__ ((always_inline)) +elf_machine_fixup_plt (struct link_map *l, lookup_t t, + const Elf64_Rela *reloc, + Elf64_Addr *reloc_addr, struct fdesc value) +{ + /* l is the link_map for the caller, t is the link_map for the object + * being called */ + /* got has already been relocated in elf_get_dynamic_info() */ + reloc_addr[1] = value.gp; + /* we need a "release" here to ensure that the gp is visible before + the code entry point is updated: */ + ((volatile Elf64_Addr *) reloc_addr)[0] = value.ip; + return value; +} + +/* Return the final value of a plt relocation. */ +static inline struct fdesc +elf_machine_plt_value (struct link_map *map, const Elf64_Rela *reloc, + struct fdesc value) +{ + /* No need to handle rel vs rela since IA64 is rela only */ + return (struct fdesc) { value.ip + reloc->r_addend, value.gp }; +} + +#endif /* !dl_machine_h */ + +#ifdef RESOLVE_MAP + +#define R_IA64_TYPE(R) ((R) & -8) +#define R_IA64_FORMAT(R) ((R) & 7) + +#define R_IA64_FORMAT_32MSB 4 +#define R_IA64_FORMAT_32LSB 5 +#define R_IA64_FORMAT_64MSB 6 +#define R_IA64_FORMAT_64LSB 7 + + +/* 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 Elf64_Rela *reloc, + const Elf64_Sym *sym, + const struct r_found_version *version, + void *const reloc_addr_arg, + int skip_ifunc) +{ + Elf64_Addr *const reloc_addr = reloc_addr_arg; + const unsigned long int r_type = ELF64_R_TYPE (reloc->r_info); + Elf64_Addr value; + +#if !defined RTLD_BOOTSTRAP && !defined HAVE_Z_COMBRELOC && !defined SHARED + /* 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 + + /* We cannot use a switch here because we cannot locate the switch + jump table until we've self-relocated. */ + +#if !defined RTLD_BOOTSTRAP || !defined HAVE_Z_COMBRELOC + if (__builtin_expect (R_IA64_TYPE (r_type) == R_IA64_TYPE (R_IA64_REL64LSB), + 0)) + { + assert (ELF64_R_TYPE (reloc->r_info) == R_IA64_REL64LSB); + value = *reloc_addr; +# if !defined RTLD_BOOTSTRAP && !defined HAVE_Z_COMBRELOC + /* Already done in dynamic linker. */ + if (map != &GL(dl_rtld_map)) +# endif + value += map->l_addr; + } + else +#endif + if (__builtin_expect (r_type == R_IA64_NONE, 0)) + return; + else + { + struct link_map *sym_map; + + /* RESOLVE_MAP() will return NULL if it fail to locate the symbol. */ + if ((sym_map = RESOLVE_MAP (&sym, version, r_type))) + { + value = sym_map->l_addr + sym->st_value + reloc->r_addend; + + if (R_IA64_TYPE (r_type) == R_IA64_TYPE (R_IA64_DIR64LSB)) + ;/* No adjustment. */ + else if (r_type == R_IA64_IPLTLSB) + { + elf_machine_fixup_plt (NULL, NULL, reloc, reloc_addr, + DL_FIXUP_MAKE_VALUE (sym_map, value)); + return; + } + else if (R_IA64_TYPE (r_type) == R_IA64_TYPE (R_IA64_FPTR64LSB)) + value = _dl_make_fptr (sym_map, sym, value); + else if (R_IA64_TYPE (r_type) == R_IA64_TYPE (R_IA64_PCREL64LSB)) + value -= (Elf64_Addr) reloc_addr & -16; + else if (R_IA64_TYPE (r_type) == R_IA64_TYPE (R_IA64_DTPMOD64LSB)) +#ifdef RTLD_BOOTSTRAP + /* During startup the dynamic linker is always index 1. */ + value = 1; +#else + /* Get the information from the link map returned by the + resolv function. */ + value = sym_map->l_tls_modid; + else if (R_IA64_TYPE (r_type) == R_IA64_TYPE (R_IA64_DTPREL64LSB)) + value -= sym_map->l_addr; +#endif + else if (R_IA64_TYPE (r_type) == R_IA64_TYPE (R_IA64_TPREL64LSB)) + { +#ifndef RTLD_BOOTSTRAP + CHECK_STATIC_TLS (map, sym_map); +#endif + value += sym_map->l_tls_offset - sym_map->l_addr; + } + else + _dl_reloc_bad_type (map, r_type, 0); + } + else + value = 0; + } + + /* ??? Ignore MSB and Instruction format for now. */ + if (R_IA64_FORMAT (r_type) == R_IA64_FORMAT_64LSB) + *reloc_addr = value; + else if (R_IA64_FORMAT (r_type) == R_IA64_FORMAT_32LSB) + *(int *) reloc_addr = value; + else if (r_type == R_IA64_IPLTLSB) + { + reloc_addr[0] = 0; + reloc_addr[1] = 0; + } + else + _dl_reloc_bad_type (map, r_type, 0); +} + +/* Let do-rel.h know that on IA-64 if l_addr is 0, all RELATIVE relocs + can be skipped. */ +#define ELF_MACHINE_REL_RELATIVE 1 + +auto inline void +__attribute ((always_inline)) +elf_machine_rela_relative (Elf64_Addr l_addr, const Elf64_Rela *reloc, + void *const reloc_addr_arg) +{ + Elf64_Addr *const reloc_addr = reloc_addr_arg; + /* ??? Ignore MSB and Instruction format for now. */ + assert (ELF64_R_TYPE (reloc->r_info) == R_IA64_REL64LSB); + + *reloc_addr += l_addr; +} + +/* Perform a RELATIVE reloc on the .got entry that transfers to the .plt. */ +auto inline void +__attribute ((always_inline)) +elf_machine_lazy_rel (struct link_map *map, + Elf64_Addr l_addr, const Elf64_Rela *reloc, + int skip_ifunc) +{ + Elf64_Addr *const reloc_addr = (void *) (l_addr + reloc->r_offset); + const unsigned long int r_type = ELF64_R_TYPE (reloc->r_info); + + if (r_type == R_IA64_IPLTLSB) + { + reloc_addr[0] += l_addr; + reloc_addr[1] += l_addr; + } + else if (r_type == R_IA64_NONE) + return; + else + _dl_reloc_bad_type (map, r_type, 1); +} + +#endif /* RESOLVE_MAP */ |