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authorMike Frysinger <vapier@gentoo.org>2014-02-15 22:07:25 -0500
committerMike Frysinger <vapier@gentoo.org>2014-02-16 01:12:38 -0500
commitc70a4b1db0cf5e813ae24b0fa96a352399eb6edf (patch)
tree5a36b0f0955682ae5232907d04fdf68589990783 /sysdeps/ia64/dl-machine.h
parent591aeaf7a99bc9aa9179f013114d92496952dced (diff)
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ia64: relocate out of ports/ subdir
Diffstat (limited to 'sysdeps/ia64/dl-machine.h')
-rw-r--r--sysdeps/ia64/dl-machine.h510
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 */