/* Machine-dependent ELF dynamic relocation inline functions. PowerPC version.
- Copyright (C) 1995-2002, 2003, 2005 Free Software Foundation, Inc.
+ Copyright (C) 1995-2020 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
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, write to the Free
- Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
- 02111-1307 USA. */
+ License along with the GNU C Library; if not, see
+ <https://www.gnu.org/licenses/>. */
#ifndef dl_machine_h
#define dl_machine_h
#include <assert.h>
#include <dl-tls.h>
+#include <dl-irel.h>
+#include <hwcapinfo.h>
+
+/* Translate a processor specific dynamic tag to the index
+ in l_info array. */
+#define DT_PPC(x) (DT_PPC_##x - DT_LOPROC + DT_NUM)
/* Return nonzero iff ELF header is compatible with the running host. */
static inline int
return ehdr->e_machine == EM_PPC;
}
+/* Return the value of the GOT pointer. */
+static inline Elf32_Addr * __attribute__ ((const))
+ppc_got (void)
+{
+ Elf32_Addr *got;
+
+ asm ("bcl 20,31,1f\n"
+ "1: mflr %0\n"
+ " addis %0,%0,_GLOBAL_OFFSET_TABLE_-1b@ha\n"
+ " addi %0,%0,_GLOBAL_OFFSET_TABLE_-1b@l\n"
+ : "=b" (got) : : "lr");
+
+ return got;
+}
/* Return the link-time address of _DYNAMIC, stored as
the first value in the GOT. */
-static inline Elf32_Addr
+static inline Elf32_Addr __attribute__ ((const))
elf_machine_dynamic (void)
{
- Elf32_Addr *got;
- asm (" bl _GLOBAL_OFFSET_TABLE_-4@local"
- : "=l"(got));
- return *got;
+ return *ppc_got ();
}
/* Return the run-time load address of the shared object. */
-static inline Elf32_Addr
+static inline Elf32_Addr __attribute__ ((const))
elf_machine_load_address (void)
{
- unsigned int *got;
- unsigned int *branchaddr;
+ Elf32_Addr *branchaddr;
+ Elf32_Addr runtime_dynamic;
/* This is much harder than you'd expect. Possibly I'm missing something.
The 'obvious' way:
the address ourselves. That gives us the following code: */
/* Get address of the 'b _DYNAMIC@local'... */
- asm ("bl 0f ;"
+ asm ("bcl 20,31,0f;"
"b _DYNAMIC@local;"
"0:"
- : "=l"(branchaddr));
-
- /* ... and the address of the GOT. */
- asm (" bl _GLOBAL_OFFSET_TABLE_-4@local"
- : "=l"(got));
+ : "=l" (branchaddr));
/* So now work out the difference between where the branch actually points,
and the offset of that location in memory from the start of the file. */
- return ((Elf32_Addr)branchaddr - *got
- + ((int)(*branchaddr << 6 & 0xffffff00) >> 6));
+ runtime_dynamic = ((Elf32_Addr) branchaddr
+ + ((Elf32_Sword) (*branchaddr << 6 & 0xffffff00) >> 6));
+
+ return runtime_dynamic - elf_machine_dynamic ();
}
#define ELF_MACHINE_BEFORE_RTLD_RELOC(dynamic_info) /* nothing */
/* 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_NOCOPY iff TYPE should not be allowed to resolve to one
+ 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. */
/* We never want to use a PLT entry as the destination of a
reloc, when what is being relocated is a branch. This is
partly for efficiency, but mostly so we avoid loops. */
-#if defined USE_TLS && (!defined RTLD_BOOTSTRAP || USE___THREAD)
#define elf_machine_type_class(type) \
((((type) == R_PPC_JMP_SLOT \
|| (type) == R_PPC_REL24 \
&& (type) <= R_PPC_DTPREL32) \
|| (type) == R_PPC_ADDR24) * ELF_RTYPE_CLASS_PLT) \
| (((type) == R_PPC_COPY) * ELF_RTYPE_CLASS_COPY))
-#else
-#define elf_machine_type_class(type) \
- ((((type) == R_PPC_JMP_SLOT \
- || (type) == R_PPC_REL24 \
- || (type) == R_PPC_ADDR24) * ELF_RTYPE_CLASS_PLT) \
- | (((type) == R_PPC_COPY) * ELF_RTYPE_CLASS_COPY))
-#endif
/* A reloc type used for ld.so cmdline arg lookups to reject PLT entries. */
#define ELF_MACHINE_JMP_SLOT R_PPC_JMP_SLOT
/* The PowerPC never uses REL relocations. */
#define ELF_MACHINE_NO_REL 1
+#define ELF_MACHINE_NO_RELA 0
+
+/* We define an initialization function to initialize HWCAP/HWCAP2 and
+ platform data so it can be copied into the TCB later. This is called
+ very early in _dl_sysdep_start for dynamically linked binaries. */
+#ifdef SHARED
+# define DL_PLATFORM_INIT dl_platform_init ()
+
+static inline void __attribute__ ((unused))
+dl_platform_init (void)
+{
+ __tcb_parse_hwcap_and_convert_at_platform ();
+}
+#endif
-/* Set up the loaded object described by L so its unrelocated PLT
+/* Set up the loaded object described by MAP so its unrelocated PLT
entries will jump to the on-demand fixup code in dl-runtime.c.
Also install a small trampoline to be used by entries that have
been relocated to an address too far away for a single branch. */
extern int __elf_machine_runtime_setup (struct link_map *map,
int lazy, int profile);
-#define elf_machine_runtime_setup __elf_machine_runtime_setup
+
+static inline int
+elf_machine_runtime_setup (struct link_map *map,
+ int lazy, int profile)
+{
+ if (map->l_info[DT_JMPREL] == 0)
+ return lazy;
+
+ if (map->l_info[DT_PPC(GOT)] == 0)
+ /* Handle old style PLT. */
+ return __elf_machine_runtime_setup (map, lazy, profile);
+
+ /* New style non-exec PLT consisting of an array of addresses. */
+ map->l_info[DT_PPC(GOT)]->d_un.d_ptr += map->l_addr;
+ if (lazy)
+ {
+ Elf32_Addr *plt, *got, glink;
+ Elf32_Word num_plt_entries;
+ void (*dlrr) (void);
+ extern void _dl_runtime_resolve (void);
+ extern void _dl_prof_resolve (void);
+
+ if (__glibc_likely (!profile))
+ dlrr = _dl_runtime_resolve;
+ else
+ {
+ if (GLRO(dl_profile) != NULL
+ &&_dl_name_match_p (GLRO(dl_profile), map))
+ GL(dl_profile_map) = map;
+ dlrr = _dl_prof_resolve;
+ }
+ got = (Elf32_Addr *) map->l_info[DT_PPC(GOT)]->d_un.d_ptr;
+ glink = got[1];
+ got[1] = (Elf32_Addr) dlrr;
+ got[2] = (Elf32_Addr) map;
+
+ /* Relocate everything in .plt by the load address offset. */
+ plt = (Elf32_Addr *) D_PTR (map, l_info[DT_PLTGOT]);
+ num_plt_entries = (map->l_info[DT_PLTRELSZ]->d_un.d_val
+ / sizeof (Elf32_Rela));
+
+ /* If a library is prelinked but we have to relocate anyway,
+ we have to be able to undo the prelinking of .plt section.
+ The prelinker saved us at got[1] address of .glink
+ section's start. */
+ if (glink)
+ {
+ glink += map->l_addr;
+ while (num_plt_entries-- != 0)
+ *plt++ = glink, glink += 4;
+ }
+ else
+ while (num_plt_entries-- != 0)
+ *plt++ += map->l_addr;
+ }
+ return lazy;
+}
/* Change the PLT entry whose reloc is 'reloc' to call the actual routine. */
extern Elf32_Addr __elf_machine_fixup_plt (struct link_map *map,
- const Elf32_Rela *reloc,
Elf32_Addr *reloc_addr,
Elf32_Addr finaladdr);
static inline Elf32_Addr
elf_machine_fixup_plt (struct link_map *map, lookup_t t,
+ const ElfW(Sym) *refsym, const ElfW(Sym) *sym,
const Elf32_Rela *reloc,
Elf32_Addr *reloc_addr, Elf64_Addr finaladdr)
{
- return __elf_machine_fixup_plt (map, reloc, reloc_addr, finaladdr);
+ if (map->l_info[DT_PPC(GOT)] == 0)
+ /* Handle old style PLT. */
+ return __elf_machine_fixup_plt (map, reloc_addr, finaladdr);
+
+ *reloc_addr = finaladdr;
+ return finaladdr;
}
/* Return the final value of a plt relocation. */
const Elf32_Sym *refsym,
Elf32_Addr *const reloc_addr,
Elf32_Addr finaladdr,
- int rinfo) attribute_hidden;
+ int rinfo, bool skip_ifunc)
+ attribute_hidden;
/* Call _dl_signal_error when a resolved value overflows a relocated area. */
extern void _dl_reloc_overflow (struct link_map *map,
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)
+ void *const reloc_addr_arg, int skip_ifunc)
{
Elf32_Addr *const reloc_addr = reloc_addr_arg;
const Elf32_Sym *const refsym = sym;
return;
}
- if (__builtin_expect (r_type == R_PPC_NONE, 0))
+ if (__glibc_unlikely (r_type == R_PPC_NONE))
return;
/* binutils on ppc32 includes st_value in r_addend for relocations
against local symbols. */
if (__builtin_expect (ELF32_ST_BIND (sym->st_info) == STB_LOCAL, 0)
&& sym->st_shndx != SHN_UNDEF)
- value = map->l_addr;
+ {
+ sym_map = map;
+ 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;
+ value = SYMBOL_ADDRESS (sym_map, sym, true);
}
value += reloc->r_addend;
#else
value = reloc->r_addend;
#endif
+ 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 = elf_ifunc_invoke (value);
+
/* A small amount of code is duplicated here for speed. In libc,
more than 90% of the relocs are R_PPC_RELATIVE; in the X11 shared
libraries, 60% are R_PPC_RELATIVE, 24% are R_PPC_GLOB_DAT or
*reloc_addr = value;
break;
-#if defined USE_TLS && (!defined RTLD_BOOTSTRAP || USE___THREAD) \
- && !defined RESOLVE_CONFLICT_FIND_MAP
+#ifndef RESOLVE_CONFLICT_FIND_MAP
# ifdef RTLD_BOOTSTRAP
# define NOT_BOOTSTRAP 0
# else
# endif
case R_PPC_DTPMOD32:
+ if (map->l_info[DT_PPC(OPT)]
+ && (map->l_info[DT_PPC(OPT)]->d_un.d_val & PPC_OPT_TLS))
+ {
+ if (!NOT_BOOTSTRAP)
+ {
+ reloc_addr[0] = 0;
+ reloc_addr[1] = (sym_map->l_tls_offset - TLS_TP_OFFSET
+ + TLS_DTV_OFFSET);
+ break;
+ }
+ else if (sym_map != NULL)
+ {
+# ifndef SHARED
+ CHECK_STATIC_TLS (map, sym_map);
+# else
+ if (TRY_STATIC_TLS (map, sym_map))
+# endif
+ {
+ reloc_addr[0] = 0;
+ /* Set up for local dynamic. */
+ reloc_addr[1] = (sym_map->l_tls_offset - TLS_TP_OFFSET
+ + TLS_DTV_OFFSET);
+ break;
+ }
+ }
+ }
if (!NOT_BOOTSTRAP)
/* During startup the dynamic linker is always index 1. */
*reloc_addr = 1;
*reloc_addr = sym_map->l_tls_modid;
break;
case R_PPC_DTPREL32:
+ if (map->l_info[DT_PPC(OPT)]
+ && (map->l_info[DT_PPC(OPT)]->d_un.d_val & PPC_OPT_TLS))
+ {
+ if (!NOT_BOOTSTRAP)
+ {
+ *reloc_addr = TLS_TPREL_VALUE (sym_map, sym, reloc);
+ break;
+ }
+ else if (sym_map != NULL)
+ {
+ /* This reloc is always preceded by R_PPC_DTPMOD32. */
+# ifndef SHARED
+ assert (HAVE_STATIC_TLS (map, sym_map));
+# else
+ if (HAVE_STATIC_TLS (map, sym_map))
+# endif
+ {
+ *reloc_addr = TLS_TPREL_VALUE (sym_map, sym, reloc);
+ break;
+ }
+ }
+ }
/* During relocation all TLS symbols are defined and used.
Therefore the offset is already correct. */
if (NOT_BOOTSTRAP && sym_map != NULL)
*reloc_addr = TLS_TPREL_VALUE (sym_map, sym, reloc);
}
break;
-#endif /* USE_TLS etc. */
+#endif
-#ifdef RESOLVE_CONFLICT_FIND_MAP
case R_PPC_JMP_SLOT:
+#ifdef RESOLVE_CONFLICT_FIND_MAP
RESOLVE_CONFLICT_FIND_MAP (map, reloc_addr);
- /* FALLTHROUGH */
#endif
+ if (map->l_info[DT_PPC(GOT)] != 0)
+ {
+ *reloc_addr = value;
+ break;
+ }
+ /* FALLTHROUGH */
default:
__process_machine_rela (map, reloc, sym_map, sym, refsym,
- reloc_addr, value, r_type);
+ reloc_addr, value, r_type, skip_ifunc);
}
}
auto inline void __attribute__ ((always_inline))
elf_machine_lazy_rel (struct link_map *map,
- Elf32_Addr l_addr, const Elf32_Rela *reloc)
+ Elf32_Addr l_addr, const Elf32_Rela *reloc,
+ int skip_ifunc)
{
/* elf_machine_runtime_setup handles this. */
}
-/* The SVR4 ABI specifies that the JMPREL relocs must be inside the
- DT_RELA table. */
-#define ELF_MACHINE_PLTREL_OVERLAP 1
-
#endif /* RESOLVE_MAP */
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