Prepare for radical source tree reorganization.zack/build-layout-experiment

All top-level files and directories are moved into a temporary storage
directory, REORG.TODO, except for files that will certainly still
exist in their current form at top level when we're done (COPYING,
COPYING.LIB, LICENSES, NEWS, README), all old ChangeLog files (which
are moved to the new directory OldChangeLogs, instead), and the
generated file INSTALL (which is just deleted; in the new order, there
will be no generated files checked into version control).

1 files changed, 368 insertions, 0 deletions

diff --git a/REORG.TODO/sysdeps/hppa/dl-fptr.c b/REORG.TODO/sysdeps/hppa/dl-fptr.c
new file mode 100644
index 0000000000..83bdb91202
--- /dev/null
+++ b/REORG.TODO/sysdeps/hppa/dl-fptr.c
@@ -0,0 +1,368 @@
+/* Manage function descriptors.  Generic version.
+   Copyright (C) 1999-2017 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, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+#include <libintl.h>
+#include <unistd.h>
+#include <string.h>
+#include <sys/param.h>
+#include <sys/mman.h>
+#include <link.h>
+#include <ldsodefs.h>
+#include <elf/dynamic-link.h>
+#include <dl-fptr.h>
+#include <dl-unmap-segments.h>
+#include <atomic.h>
+
+#ifndef ELF_MACHINE_BOOT_FPTR_TABLE_LEN
+/* ELF_MACHINE_BOOT_FPTR_TABLE_LEN should be greater than the number of
+   dynamic symbols in ld.so.  */
+# define ELF_MACHINE_BOOT_FPTR_TABLE_LEN 256
+#endif
+
+#ifndef ELF_MACHINE_LOAD_ADDRESS
+# error "ELF_MACHINE_LOAD_ADDRESS is not defined."
+#endif
+
+#ifndef COMPARE_AND_SWAP
+# define COMPARE_AND_SWAP(ptr, old, new) \
+  (catomic_compare_and_exchange_bool_acq (ptr, new, old) == 0)
+#endif
+
+ElfW(Addr) _dl_boot_fptr_table [ELF_MACHINE_BOOT_FPTR_TABLE_LEN];
+
+static struct local
+  {
+    struct fdesc_table *root;
+    struct fdesc *free_list;
+    unsigned int npages;		/* # of pages to allocate */
+    /* the next to members MUST be consecutive! */
+    struct fdesc_table boot_table;
+    struct fdesc boot_fdescs[1024];
+  }
+local =
+  {
+#ifdef SHARED
+    /* Address of .boot_table is not known until runtime.  */
+    .root = 0,
+#else
+    .root = &local.boot_table,
+#endif
+    .npages = 2,
+    .boot_table =
+      {
+	.len = sizeof (local.boot_fdescs) / sizeof (local.boot_fdescs[0]),
+	.first_unused = 0
+      }
+  };
+
+/* Create a new fdesc table and return a pointer to the first fdesc
+   entry.  The fdesc lock must have been acquired already.  */
+
+static struct fdesc_table *
+new_fdesc_table (struct local *l, size_t *size)
+{
+  size_t old_npages = l->npages;
+  size_t new_npages = old_npages + old_npages;
+  struct fdesc_table *new_table;
+
+  /* If someone has just created a new table, we return NULL to tell
+     the caller to use the new table.  */
+  if (! COMPARE_AND_SWAP (&l->npages, old_npages, new_npages))
+    return (struct fdesc_table *) NULL;
+
+  *size = old_npages * GLRO(dl_pagesize);
+  new_table = __mmap (NULL, *size,
+		      PROT_READ | PROT_WRITE, MAP_ANON | MAP_PRIVATE, -1, 0);
+  if (new_table == MAP_FAILED)
+    _dl_signal_error (errno, NULL, NULL,
+		      N_("cannot map pages for fdesc table"));
+
+  new_table->len
+    = (*size - sizeof (*new_table)) / sizeof (struct fdesc);
+  new_table->first_unused = 1;
+  return new_table;
+}
+
+/* Must call _dl_fptr_init before using any other function.  */
+void
+_dl_fptr_init (void)
+{
+  struct local *l;
+
+  ELF_MACHINE_LOAD_ADDRESS (l, local);
+  l->root = &l->boot_table;
+}
+
+static ElfW(Addr)
+make_fdesc (ElfW(Addr) ip, ElfW(Addr) gp)
+{
+  struct fdesc *fdesc = NULL;
+  struct fdesc_table *root;
+  unsigned int old;
+  struct local *l;
+
+  ELF_MACHINE_LOAD_ADDRESS (l, local);
+
+ retry:
+  root = l->root;
+  while (1)
+    {
+      old = root->first_unused;
+      if (old >= root->len)
+	break;
+      else if (COMPARE_AND_SWAP (&root->first_unused, old, old + 1))
+	{
+	  fdesc = &root->fdesc[old];
+	  goto install;
+	}
+    }
+
+  if (l->free_list)
+    {
+      /* Get it from free-list.  */
+      do
+	{
+	  fdesc = l->free_list;
+	  if (fdesc == NULL)
+	    goto retry;
+	}
+      while (! COMPARE_AND_SWAP ((ElfW(Addr) *) &l->free_list,
+				 (ElfW(Addr)) fdesc, fdesc->ip));
+    }
+  else
+    {
+      /* Create a new fdesc table.  */
+      size_t size;
+      struct fdesc_table *new_table = new_fdesc_table (l, &size);
+
+      if (new_table == NULL)
+	goto retry;
+
+      new_table->next = root;
+      if (! COMPARE_AND_SWAP ((ElfW(Addr) *) &l->root,
+			      (ElfW(Addr)) root,
+			      (ElfW(Addr)) new_table))
+	{
+	  /* Someone has just installed a new table. Return NULL to
+	     tell the caller to use the new table.  */
+	  __munmap (new_table, size);
+	  goto retry;
+	}
+
+      /* Note that the first entry was reserved while allocating the
+	 memory for the new page.  */
+      fdesc = &new_table->fdesc[0];
+    }
+
+ install:
+  fdesc->ip = ip;
+  fdesc->gp = gp;
+
+  return (ElfW(Addr)) fdesc;
+}
+
+
+static inline ElfW(Addr) * __attribute__ ((always_inline))
+make_fptr_table (struct link_map *map)
+{
+  const ElfW(Sym) *symtab
+    = (const void *) D_PTR (map, l_info[DT_SYMTAB]);
+  const char *strtab = (const void *) D_PTR (map, l_info[DT_STRTAB]);
+  ElfW(Addr) *fptr_table;
+  size_t size;
+  size_t len;
+
+  /* XXX Apparently the only way to find out the size of the dynamic
+     symbol section is to assume that the string table follows right
+     afterwards...  */
+  len = ((strtab - (char *) symtab)
+	 / map->l_info[DT_SYMENT]->d_un.d_val);
+  size = ((len * sizeof (fptr_table[0]) + GLRO(dl_pagesize) - 1)
+	  & -GLRO(dl_pagesize));
+  /* XXX We don't support here in the moment systems without MAP_ANON.
+     There probably are none for IA-64.  In case this is proven wrong
+     we will have to open /dev/null here and use the file descriptor
+     instead of the hard-coded -1.  */
+  fptr_table = __mmap (NULL, size,
+		       PROT_READ | PROT_WRITE, MAP_ANON | MAP_PRIVATE,
+		       -1, 0);
+  if (fptr_table == MAP_FAILED)
+    _dl_signal_error (errno, NULL, NULL,
+		      N_("cannot map pages for fptr table"));
+
+  if (COMPARE_AND_SWAP ((ElfW(Addr) *) &map->l_mach.fptr_table,
+			(ElfW(Addr)) NULL, (ElfW(Addr)) fptr_table))
+    map->l_mach.fptr_table_len = len;
+  else
+    __munmap (fptr_table, len * sizeof (fptr_table[0]));
+
+  return map->l_mach.fptr_table;
+}
+
+
+ElfW(Addr)
+_dl_make_fptr (struct link_map *map, const ElfW(Sym) *sym,
+	       ElfW(Addr) ip)
+{
+  ElfW(Addr) *ftab = map->l_mach.fptr_table;
+  const ElfW(Sym) *symtab;
+  Elf_Symndx symidx;
+  struct local *l;
+
+  if (__builtin_expect (ftab == NULL, 0))
+    ftab = make_fptr_table (map);
+
+  symtab = (const void *) D_PTR (map, l_info[DT_SYMTAB]);
+  symidx = sym - symtab;
+
+  if (symidx >= map->l_mach.fptr_table_len)
+    _dl_signal_error (0, NULL, NULL,
+		      N_("internal error: symidx out of range of fptr table"));
+
+  while (ftab[symidx] == 0)
+    {
+      /* GOT has already been relocated in elf_get_dynamic_info -
+	 don't try to relocate it again.  */
+      ElfW(Addr) fdesc
+	= make_fdesc (ip, map->l_info[DT_PLTGOT]->d_un.d_ptr);
+
+      if (__builtin_expect (COMPARE_AND_SWAP (&ftab[symidx], (ElfW(Addr)) NULL,
+					      fdesc), 1))
+	{
+	  /* Noone has updated the entry and the new function
+	     descriptor has been installed.  */
+#if 0
+	  const char *strtab
+	    = (const void *) D_PTR (map, l_info[DT_STRTAB]);
+
+	  ELF_MACHINE_LOAD_ADDRESS (l, local);
+	  if (l->root != &l->boot_table
+	      || l->boot_table.first_unused > 20)
+	    _dl_debug_printf ("created fdesc symbol `%s' at %lx\n",
+			      strtab + sym->st_name, ftab[symidx]);
+#endif
+	  break;
+	}
+      else
+	{
+	  /* We created a duplicated function descriptor. We put it on
+	     free-list.  */
+	  struct fdesc *f = (struct fdesc *) fdesc;
+
+	  ELF_MACHINE_LOAD_ADDRESS (l, local);
+
+	  do
+	    f->ip = (ElfW(Addr)) l->free_list;
+	  while (! COMPARE_AND_SWAP ((ElfW(Addr) *) &l->free_list,
+				     f->ip, fdesc));
+	}
+    }
+
+  return ftab[symidx];
+}
+
+
+void
+_dl_unmap (struct link_map *map)
+{
+  ElfW(Addr) *ftab = map->l_mach.fptr_table;
+  struct fdesc *head = NULL, *tail = NULL;
+  size_t i;
+
+  _dl_unmap_segments (map);
+
+  if (ftab == NULL)
+    return;
+
+  /* String together the fdesc structures that are being freed.  */
+  for (i = 0; i < map->l_mach.fptr_table_len; ++i)
+    {
+      if (ftab[i])
+	{
+	  *(struct fdesc **) ftab[i] = head;
+	  head = (struct fdesc *) ftab[i];
+	  if (tail == NULL)
+	    tail = head;
+	}
+    }
+
+  /* Prepend the new list to the free_list: */
+  if (tail)
+    do
+      tail->ip = (ElfW(Addr)) local.free_list;
+    while (! COMPARE_AND_SWAP ((ElfW(Addr) *) &local.free_list,
+			       tail->ip, (ElfW(Addr)) head));
+
+  __munmap (ftab, (map->l_mach.fptr_table_len
+		   * sizeof (map->l_mach.fptr_table[0])));
+
+  map->l_mach.fptr_table = NULL;
+}
+
+extern ElfW(Addr) _dl_fixup (struct link_map *, ElfW(Word)) attribute_hidden;
+
+static inline Elf32_Addr
+elf_machine_resolve (void)
+{
+  Elf32_Addr addr;
+
+  asm ("b,l     1f,%0\n"
+"	depi	0,31,2,%0\n"
+"1:	addil	L'_dl_runtime_resolve - ($PIC_pcrel$0 - 8),%0\n"
+"	ldo	R'_dl_runtime_resolve - ($PIC_pcrel$0 - 12)(%%r1),%0\n"
+       : "=r" (addr) : : "r1");
+
+  return addr;
+}
+
+ElfW(Addr)
+_dl_lookup_address (const void *address)
+{
+  ElfW(Addr) addr = (ElfW(Addr)) address;
+  unsigned int *desc, *gptr;
+
+  /* Check for special cases.  */
+  if ((int) addr == -1
+      || (unsigned int) addr < 4096
+      || !((unsigned int) addr & 2))
+    return addr;
+
+  /* Clear least-significant two bits from descriptor address.  */
+  desc = (unsigned int *) ((unsigned int) addr & ~3);
+
+  /* Check if descriptor requires resolution.  The following trampoline is
+     used in each global offset table for function resolution:
+
+		ldw 0(r20),r22
+		bv r0(r22)
+		ldw 4(r20),r21
+     tramp:	b,l .-12,r20
+		depwi 0,31,2,r20
+		.word _dl_runtime_resolve
+		.word "_dl_runtime_resolve ltp"
+     got:	.word _DYNAMIC
+		.word "struct link map address" */
+  gptr = (unsigned int *) desc[0];
+  if (gptr[0] == 0xea9f1fdd			/* b,l .-12,r20     */
+      && gptr[1] == 0xd6801c1e			/* depwi 0,31,2,r20 */
+      && (ElfW(Addr)) gptr[2] == elf_machine_resolve ())
+    _dl_fixup ((struct link_map *) gptr[5], (ElfW(Word)) desc[1]);
+
+  return (ElfW(Addr)) desc[0];
+}