1 files changed, 447 insertions, 0 deletions

diff --git a/REORG.TODO/sysdeps/aarch64/dl-machine.h b/REORG.TODO/sysdeps/aarch64/dl-machine.h
new file mode 100644
index 0000000000..15d79a6961
--- /dev/null
+++ b/REORG.TODO/sysdeps/aarch64/dl-machine.h
@@ -0,0 +1,447 @@
+/* Copyright (C) 1995-2017 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 "aarch64"
+
+#include <sysdep.h>
+#include <tls.h>
+#include <dl-tlsdesc.h>
+#include <dl-irel.h>
+#include <cpu-features.c>
+
+/* Return nonzero iff ELF header is compatible with the running host.  */
+static inline int __attribute__ ((unused))
+elf_machine_matches_host (const ElfW(Ehdr) *ehdr)
+{
+  return ehdr->e_machine == EM_AARCH64;
+}
+
+/* Return the link-time address of _DYNAMIC.  Conveniently, this is the
+   first element of the GOT. */
+static inline ElfW(Addr) __attribute__ ((unused))
+elf_machine_dynamic (void)
+{
+  extern const ElfW(Addr) _GLOBAL_OFFSET_TABLE_[] attribute_hidden;
+  return _GLOBAL_OFFSET_TABLE_[0];
+}
+
+/* Return the run-time load address of the shared object.  */
+
+static inline ElfW(Addr) __attribute__ ((unused))
+elf_machine_load_address (void)
+{
+  /* To figure out the load address we use the definition that for any symbol:
+     dynamic_addr(symbol) = static_addr(symbol) + load_addr
+
+     The choice of symbol is arbitrary. The static address we obtain
+     by constructing a non GOT reference to the symbol, the dynamic
+     address of the symbol we compute using adrp/add to compute the
+     symbol's address relative to the PC.
+     This depends on 32/16bit relocations being resolved at link time
+     and that the static address fits in the 32/16 bits.  */
+
+  ElfW(Addr) static_addr;
+  ElfW(Addr) dynamic_addr;
+
+  asm ("					\n"
+"	adrp	%1, _dl_start;			\n"
+#ifdef __LP64__
+"	add	%1, %1, #:lo12:_dl_start	\n"
+#else
+"	add	%w1, %w1, #:lo12:_dl_start	\n"
+#endif
+"	ldr	%w0, 1f				\n"
+"	b	2f				\n"
+"1:						\n"
+#ifdef __LP64__
+"	.word	_dl_start			\n"
+#else
+# ifdef __AARCH64EB__
+"	.short  0                               \n"
+# endif
+"	.short  _dl_start                       \n"
+# ifndef __AARCH64EB__
+"	.short  0                               \n"
+# endif
+#endif
+"2:						\n"
+    : "=r" (static_addr),  "=r" (dynamic_addr));
+  return dynamic_addr - static_addr;
+}
+
+/* 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))
+elf_machine_runtime_setup (struct link_map *l, int lazy, int profile)
+{
+  if (l->l_info[DT_JMPREL] && lazy)
+    {
+      ElfW(Addr) *got;
+      extern void _dl_runtime_resolve (ElfW(Word));
+      extern void _dl_runtime_profile (ElfW(Word));
+
+      got = (ElfW(Addr) *) D_PTR (l, l_info[DT_PLTGOT]);
+      if (got[1])
+	{
+	  l->l_mach.plt = got[1] + l->l_addr;
+	}
+      got[1] = (ElfW(Addr)) l;
+
+      /* The got[2] entry contains the address of a function which gets
+	 called to get the address of a so far unresolved function and
+	 jump to it.  The profiling extension of the dynamic linker allows
+	 to intercept the calls to collect information.  In this case we
+	 don't store the address in the GOT so that all future calls also
+	 end in this function.  */
+      if ( profile)
+	{
+	   got[2] = (ElfW(Addr)) &_dl_runtime_profile;
+
+	  if (GLRO(dl_profile) != NULL
+	      && _dl_name_match_p (GLRO(dl_profile), l))
+	    /* Say that we really want profiling and the timers are
+	       started.  */
+	    GL(dl_profile_map) = l;
+	}
+      else
+	{
+	  /* 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] = (ElfW(Addr)) &_dl_runtime_resolve;
+	}
+    }
+
+  if (l->l_info[ADDRIDX (DT_TLSDESC_GOT)] && lazy)
+    *(ElfW(Addr)*)(D_PTR (l, l_info[ADDRIDX (DT_TLSDESC_GOT)]) + l->l_addr)
+      = (ElfW(Addr)) &_dl_tlsdesc_resolve_rela;
+
+  return lazy;
+}
+
+/* Initial entry point for the dynamic linker. The C function
+   _dl_start is the real entry point, its return value is the user
+   program's entry point */
+#ifdef __LP64__
+# define RTLD_START RTLD_START_1 ("x", "3", "sp")
+#else
+# define RTLD_START RTLD_START_1 ("w", "2", "wsp")
+#endif
+
+
+#define RTLD_START_1(PTR, PTR_SIZE_LOG, PTR_SP) asm ("\
+.text									\n\
+.globl _start								\n\
+.type _start, %function							\n\
+.globl _dl_start_user							\n\
+.type _dl_start_user, %function						\n\
+_start:									\n\
+	mov	" PTR "0, " PTR_SP "					\n\
+	bl	_dl_start						\n\
+	// returns user entry point in x0				\n\
+	mov	x21, x0							\n\
+_dl_start_user:								\n\
+	// get the original arg count					\n\
+	ldr	" PTR "1, [sp]						\n\
+	// get the argv address						\n\
+	add	" PTR "2, " PTR_SP ", #(1<<"  PTR_SIZE_LOG ")		\n\
+	// get _dl_skip_args to see if we were				\n\
+	// invoked as an executable					\n\
+	adrp	x4, _dl_skip_args					\n\
+        ldr	w4, [x4, #:lo12:_dl_skip_args]				\n\
+	// do we need to adjust argc/argv				\n\
+        cmp	w4, 0							\n\
+	beq	.L_done_stack_adjust					\n\
+	// subtract _dl_skip_args from original arg count		\n\
+	sub	" PTR "1, " PTR "1, " PTR "4				\n\
+	// store adjusted argc back to stack				\n\
+	str	" PTR "1, [sp]						\n\
+	// find the first unskipped argument				\n\
+	mov	" PTR "3, " PTR "2					\n\
+	add	" PTR "4, " PTR "2, " PTR "4, lsl #" PTR_SIZE_LOG "	\n\
+	// shuffle argv down						\n\
+1:	ldr	" PTR "5, [x4], #(1<<"  PTR_SIZE_LOG ")			\n\
+	str	" PTR "5, [x3], #(1<<"  PTR_SIZE_LOG ")			\n\
+	cmp	" PTR "5, #0						\n\
+	bne	1b							\n\
+	// shuffle envp down						\n\
+1:	ldr	" PTR "5, [x4], #(1<<"  PTR_SIZE_LOG ")			\n\
+	str	" PTR "5, [x3], #(1<<"  PTR_SIZE_LOG ")			\n\
+	cmp	" PTR "5, #0						\n\
+	bne	1b							\n\
+	// shuffle auxv down						\n\
+1:	ldp	" PTR "0, " PTR "5, [x4, #(2<<"  PTR_SIZE_LOG ")]!	\n\
+	stp	" PTR "0, " PTR "5, [x3], #(2<<"  PTR_SIZE_LOG ")	\n\
+	cmp	" PTR "0, #0						\n\
+	bne	1b							\n\
+	// Update _dl_argv						\n\
+	adrp	x3, _dl_argv						\n\
+	str	" PTR "2, [x3, #:lo12:_dl_argv]				\n\
+.L_done_stack_adjust:							\n\
+	// compute envp							\n\
+	add	" PTR "3, " PTR "2, " PTR "1, lsl #" PTR_SIZE_LOG "	\n\
+	add	" PTR "3, " PTR "3, #(1<<"  PTR_SIZE_LOG ")		\n\
+	adrp	x16, _rtld_local					\n\
+        add	" PTR "16, " PTR "16, #:lo12:_rtld_local		\n\
+        ldr	" PTR "0, [x16]						\n\
+	bl	_dl_init						\n\
+	// load the finalizer function					\n\
+	adrp	x0, _dl_fini						\n\
+	add	" PTR "0, " PTR "0, #:lo12:_dl_fini			\n\
+	// jump to the user_s entry point				\n\
+	br      x21							\n\
+");
+
+#define elf_machine_type_class(type)					\
+  ((((type) == AARCH64_R(JUMP_SLOT)					\
+     || (type) == AARCH64_R(TLS_DTPMOD)					\
+     || (type) == AARCH64_R(TLS_DTPREL)					\
+     || (type) == AARCH64_R(TLS_TPREL)					\
+     || (type) == AARCH64_R(TLSDESC)) * ELF_RTYPE_CLASS_PLT)		\
+   | (((type) == AARCH64_R(COPY)) * ELF_RTYPE_CLASS_COPY)		\
+   | (((type) == AARCH64_R(GLOB_DAT)) * ELF_RTYPE_CLASS_EXTERN_PROTECTED_DATA))
+
+#define ELF_MACHINE_JMP_SLOT	AARCH64_R(JUMP_SLOT)
+
+/* AArch64 uses RELA not REL */
+#define ELF_MACHINE_NO_REL 1
+#define ELF_MACHINE_NO_RELA 0
+
+#define DL_PLATFORM_INIT dl_platform_init ()
+
+static inline void __attribute__ ((unused))
+dl_platform_init (void)
+{
+  if (GLRO(dl_platform) != NULL && *GLRO(dl_platform) == '\0')
+    /* Avoid an empty string which would disturb us.  */
+    GLRO(dl_platform) = NULL;
+
+#ifdef SHARED
+  /* init_cpu_features has been called early from __libc_start_main in
+     static executable.  */
+  init_cpu_features (&GLRO(dl_aarch64_cpu_features));
+#endif
+}
+
+
+static inline ElfW(Addr)
+elf_machine_fixup_plt (struct link_map *map, lookup_t t,
+		       const ElfW(Rela) *reloc,
+		       ElfW(Addr) *reloc_addr,
+		       ElfW(Addr) value)
+{
+  return *reloc_addr = value;
+}
+
+/* Return the final value of a plt relocation.  */
+static inline ElfW(Addr)
+elf_machine_plt_value (struct link_map *map,
+		       const ElfW(Rela) *reloc,
+		       ElfW(Addr) value)
+{
+  return value;
+}
+
+#endif
+
+/* Names of the architecture-specific auditing callback functions.  */
+#define ARCH_LA_PLTENTER aarch64_gnu_pltenter
+#define ARCH_LA_PLTEXIT  aarch64_gnu_pltexit
+
+#ifdef RESOLVE_MAP
+
+auto inline void
+__attribute__ ((always_inline))
+elf_machine_rela (struct link_map *map, const ElfW(Rela) *reloc,
+		  const ElfW(Sym) *sym, const struct r_found_version *version,
+		  void *const reloc_addr_arg, int skip_ifunc)
+{
+  ElfW(Addr) *const reloc_addr = reloc_addr_arg;
+  const unsigned int r_type = ELFW (R_TYPE) (reloc->r_info);
+
+  if (__builtin_expect (r_type == AARCH64_R(RELATIVE), 0))
+      *reloc_addr = map->l_addr + reloc->r_addend;
+  else if (__builtin_expect (r_type == R_AARCH64_NONE, 0))
+      return;
+  else
+    {
+      const ElfW(Sym) *const refsym = sym;
+      struct link_map *sym_map = RESOLVE_MAP (&sym, version, r_type);
+      ElfW(Addr) value = sym_map == NULL ? 0 : sym_map->l_addr + sym->st_value;
+
+      if (sym != NULL
+	  && __glibc_unlikely (ELFW(ST_TYPE) (sym->st_info) == STT_GNU_IFUNC)
+	  && __glibc_likely (sym->st_shndx != SHN_UNDEF)
+	  && __glibc_likely (!skip_ifunc))
+	value = elf_ifunc_invoke (value);
+
+      switch (r_type)
+	{
+	case AARCH64_R(COPY):
+	  if (sym == NULL)
+	      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;
+
+	case AARCH64_R(RELATIVE):
+	case AARCH64_R(GLOB_DAT):
+	case AARCH64_R(JUMP_SLOT):
+	case AARCH64_R(ABS32):
+#ifdef __LP64__
+	case AARCH64_R(ABS64):
+#endif
+	  *reloc_addr = value + reloc->r_addend;
+	  break;
+
+	case AARCH64_R(TLSDESC):
+	  {
+	    struct tlsdesc volatile *td =
+	      (struct tlsdesc volatile *)reloc_addr;
+#ifndef RTLD_BOOTSTRAP
+	    if (! sym)
+	      {
+		td->arg = (void*)reloc->r_addend;
+		td->entry = _dl_tlsdesc_undefweak;
+	      }
+	    else
+#endif
+	      {
+#ifndef RTLD_BOOTSTRAP
+# ifndef SHARED
+		CHECK_STATIC_TLS (map, sym_map);
+# else
+		if (!TRY_STATIC_TLS (map, sym_map))
+		  {
+		    td->arg = _dl_make_tlsdesc_dynamic
+		      (sym_map, sym->st_value + reloc->r_addend);
+		    td->entry = _dl_tlsdesc_dynamic;
+		  }
+		else
+# endif
+#endif
+		  {
+		    td->arg = (void*)(sym->st_value + sym_map->l_tls_offset
+				      + reloc->r_addend);
+		    td->entry = _dl_tlsdesc_return;
+		  }
+	      }
+	    break;
+	  }
+
+	case AARCH64_R(TLS_DTPMOD):
+#ifdef RTLD_BOOTSTRAP
+	  *reloc_addr = 1;
+#else
+	  if (sym_map != NULL)
+	    {
+	      *reloc_addr = sym_map->l_tls_modid;
+	    }
+#endif
+	  break;
+
+	case AARCH64_R(TLS_DTPREL):
+	  if (sym)
+	    *reloc_addr = sym->st_value + reloc->r_addend;
+	  break;
+
+	case AARCH64_R(TLS_TPREL):
+	  if (sym)
+	    {
+	      CHECK_STATIC_TLS (map, sym_map);
+	      *reloc_addr =
+		sym->st_value + reloc->r_addend + sym_map->l_tls_offset;
+	    }
+	  break;
+
+	case AARCH64_R(IRELATIVE):
+	  value = map->l_addr + reloc->r_addend;
+	  value = elf_ifunc_invoke (value);
+	  *reloc_addr = value;
+	  break;
+
+	default:
+	  _dl_reloc_bad_type (map, r_type, 0);
+	  break;
+	}
+    }
+}
+
+inline void
+__attribute__ ((always_inline))
+elf_machine_rela_relative (ElfW(Addr) l_addr,
+			   const ElfW(Rela) *reloc,
+			   void *const reloc_addr_arg)
+{
+  ElfW(Addr) *const reloc_addr = reloc_addr_arg;
+  *reloc_addr = l_addr + reloc->r_addend;
+}
+
+inline void
+__attribute__ ((always_inline))
+elf_machine_lazy_rel (struct link_map *map,
+		      ElfW(Addr) l_addr,
+		      const ElfW(Rela) *reloc,
+		      int skip_ifunc)
+{
+  ElfW(Addr) *const reloc_addr = (void *) (l_addr + reloc->r_offset);
+  const unsigned int r_type = ELFW (R_TYPE) (reloc->r_info);
+  /* Check for unexpected PLT reloc type.  */
+  if (__builtin_expect (r_type == AARCH64_R(JUMP_SLOT), 1))
+    {
+      if (__builtin_expect (map->l_mach.plt, 0) == 0)
+	*reloc_addr += l_addr;
+      else
+	*reloc_addr = map->l_mach.plt;
+    }
+  else if (__builtin_expect (r_type == AARCH64_R(TLSDESC), 1))
+    {
+      struct tlsdesc volatile *td =
+	(struct tlsdesc volatile *)reloc_addr;
+
+      td->arg = (void*)reloc;
+      td->entry = (void*)(D_PTR (map, l_info[ADDRIDX (DT_TLSDESC_PLT)])
+			  + map->l_addr);
+    }
+  else if (__glibc_unlikely (r_type == AARCH64_R(IRELATIVE)))
+    {
+      ElfW(Addr) value = map->l_addr + reloc->r_addend;
+      if (__glibc_likely (!skip_ifunc))
+	value = elf_ifunc_invoke (value);
+      *reloc_addr = value;
+    }
+  else
+    _dl_reloc_bad_type (map, r_type, 1);
+}
+
+#endif