sdcc-3.9.0 fork implementing GNU assembler syntax

This fork aims to provide better support for stm8-binutils

1 files changed, 610 insertions, 0 deletions

diff --git a/support/sdbinutils/bfd/compress.c b/support/sdbinutils/bfd/compress.c
new file mode 100644
index 0000000..1a531ea
--- /dev/null
+++ b/support/sdbinutils/bfd/compress.c
@@ -0,0 +1,610 @@
+/* Compressed section support (intended for debug sections).
+   Copyright (C) 2008-2018 Free Software Foundation, Inc.
+
+   This file is part of BFD, the Binary File Descriptor library.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program 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 General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
+   MA 02110-1301, USA.  */
+
+#include "sysdep.h"
+#include <zlib.h>
+#include "bfd.h"
+#include "libbfd.h"
+#include "safe-ctype.h"
+
+#define MAX_COMPRESSION_HEADER_SIZE 24
+
+static bfd_boolean
+decompress_contents (bfd_byte *compressed_buffer,
+		     bfd_size_type compressed_size,
+		     bfd_byte *uncompressed_buffer,
+		     bfd_size_type uncompressed_size)
+{
+  z_stream strm;
+  int rc;
+
+  /* It is possible the section consists of several compressed
+     buffers concatenated together, so we uncompress in a loop.  */
+  /* PR 18313: The state field in the z_stream structure is supposed
+     to be invisible to the user (ie us), but some compilers will
+     still complain about it being used without initialisation.  So
+     we first zero the entire z_stream structure and then set the fields
+     that we need.  */
+  memset (& strm, 0, sizeof strm);
+  strm.avail_in = compressed_size;
+  strm.next_in = (Bytef*) compressed_buffer;
+  strm.avail_out = uncompressed_size;
+
+  BFD_ASSERT (Z_OK == 0);
+  rc = inflateInit (&strm);
+  while (strm.avail_in > 0 && strm.avail_out > 0)
+    {
+      if (rc != Z_OK)
+	break;
+      strm.next_out = ((Bytef*) uncompressed_buffer
+		       + (uncompressed_size - strm.avail_out));
+      rc = inflate (&strm, Z_FINISH);
+      if (rc != Z_STREAM_END)
+	break;
+      rc = inflateReset (&strm);
+    }
+  rc |= inflateEnd (&strm);
+  return rc == Z_OK && strm.avail_out == 0;
+}
+
+/* Compress data of the size specified in @var{uncompressed_size}
+   and pointed to by @var{uncompressed_buffer} using zlib and store
+   as the contents field.  This function assumes the contents
+   field was allocated using bfd_malloc() or equivalent.
+
+   Return the uncompressed size if the full section contents is
+   compressed successfully.  Otherwise return 0.  */
+
+static bfd_size_type
+bfd_compress_section_contents (bfd *abfd, sec_ptr sec,
+			       bfd_byte *uncompressed_buffer,
+			       bfd_size_type uncompressed_size)
+{
+  uLong compressed_size;
+  bfd_byte *buffer;
+  bfd_size_type buffer_size;
+  bfd_boolean decompress;
+  int zlib_size = 0;
+  int orig_compression_header_size;
+  bfd_size_type orig_uncompressed_size;
+  int header_size = bfd_get_compression_header_size (abfd, NULL);
+  bfd_boolean compressed
+    = bfd_is_section_compressed_with_header (abfd, sec,
+					     &orig_compression_header_size,
+					     &orig_uncompressed_size);
+
+  /* Either ELF compression header or the 12-byte, "ZLIB" + 8-byte size,
+     overhead in .zdebug* section.  */
+  if (!header_size)
+     header_size = 12;
+
+  if (compressed)
+    {
+      /* We shouldn't decompress unsupported compressed section.  */
+      if (orig_compression_header_size < 0)
+	abort ();
+
+      /* Different compression schemes.  Just move the compressed section
+	 contents to the right position. */
+      if (orig_compression_header_size == 0)
+	{
+	  /* Convert it from .zdebug* section.  Get the uncompressed
+	     size first.  We need to subtract the 12-byte overhead in
+	     .zdebug* section.  Set orig_compression_header_size to
+	     the 12-bye overhead.  */
+	  orig_compression_header_size = 12;
+	  zlib_size = uncompressed_size - 12;
+	}
+      else
+	{
+	  /* Convert it to .zdebug* section.  */
+	  zlib_size = uncompressed_size - orig_compression_header_size;
+	}
+
+      /* Add the header size.  */
+      compressed_size = zlib_size + header_size;
+    }
+  else
+    compressed_size = compressBound (uncompressed_size) + header_size;
+
+  /* Uncompress if it leads to smaller size.  */
+  if (compressed && compressed_size > orig_uncompressed_size)
+    {
+      decompress = TRUE;
+      buffer_size = orig_uncompressed_size;
+    }
+  else
+    {
+      decompress = FALSE;
+      buffer_size = compressed_size;
+    }
+  buffer = (bfd_byte *) bfd_alloc (abfd, buffer_size);
+  if (buffer == NULL)
+    return 0;
+
+  if (compressed)
+    {
+      sec->size = orig_uncompressed_size;
+      if (decompress)
+	{
+	  if (!decompress_contents (uncompressed_buffer
+				    + orig_compression_header_size,
+				    zlib_size, buffer, buffer_size))
+	    {
+	      bfd_set_error (bfd_error_bad_value);
+	      bfd_release (abfd, buffer);
+	      return 0;
+	    }
+	  free (uncompressed_buffer);
+	  sec->contents = buffer;
+	  sec->compress_status = COMPRESS_SECTION_DONE;
+	  return orig_uncompressed_size;
+	}
+      else
+	{
+	  bfd_update_compression_header (abfd, buffer, sec);
+	  memmove (buffer + header_size,
+		   uncompressed_buffer + orig_compression_header_size,
+		   zlib_size);
+	}
+    }
+  else
+    {
+      if (compress ((Bytef*) buffer + header_size,
+		    &compressed_size,
+		    (const Bytef*) uncompressed_buffer,
+		    uncompressed_size) != Z_OK)
+	{
+	  bfd_release (abfd, buffer);
+	  bfd_set_error (bfd_error_bad_value);
+	  return 0;
+	}
+
+      compressed_size += header_size;
+      /* PR binutils/18087: If compression didn't make the section smaller,
+	 just keep it uncompressed.  */
+      if (compressed_size < uncompressed_size)
+	bfd_update_compression_header (abfd, buffer, sec);
+      else
+	{
+	  /* NOTE: There is a small memory leak here since
+	     uncompressed_buffer is malloced and won't be freed.  */
+	  bfd_release (abfd, buffer);
+	  sec->contents = uncompressed_buffer;
+	  sec->compress_status = COMPRESS_SECTION_NONE;
+	  return uncompressed_size;
+	}
+    }
+
+  free (uncompressed_buffer);
+  sec->contents = buffer;
+  sec->size = compressed_size;
+  sec->compress_status = COMPRESS_SECTION_DONE;
+
+  return uncompressed_size;
+}
+
+/*
+FUNCTION
+	bfd_get_full_section_contents
+
+SYNOPSIS
+	bfd_boolean bfd_get_full_section_contents
+	  (bfd *abfd, asection *section, bfd_byte **ptr);
+
+DESCRIPTION
+	Read all data from @var{section} in BFD @var{abfd}, decompress
+	if needed, and store in @var{*ptr}.  If @var{*ptr} is NULL,
+	return @var{*ptr} with memory malloc'd by this function.
+
+	Return @code{TRUE} if the full section contents is retrieved
+	successfully.  If the section has no contents then this function
+	returns @code{TRUE} but @var{*ptr} is set to NULL.
+*/
+
+bfd_boolean
+bfd_get_full_section_contents (bfd *abfd, sec_ptr sec, bfd_byte **ptr)
+{
+  bfd_size_type sz;
+  bfd_byte *p = *ptr;
+  bfd_boolean ret;
+  bfd_size_type save_size;
+  bfd_size_type save_rawsize;
+  bfd_byte *compressed_buffer;
+  unsigned int compression_header_size;
+
+  if (abfd->direction != write_direction && sec->rawsize != 0)
+    sz = sec->rawsize;
+  else
+    sz = sec->size;
+  if (sz == 0)
+    {
+      *ptr = NULL;
+      return TRUE;
+    }
+
+  switch (sec->compress_status)
+    {
+    case COMPRESS_SECTION_NONE:
+      if (p == NULL)
+	{
+	  p = (bfd_byte *) bfd_malloc (sz);
+	  if (p == NULL)
+	    {
+	      /* PR 20801: Provide a more helpful error message.  */
+	      if (bfd_get_error () == bfd_error_no_memory)
+		_bfd_error_handler
+		  /* xgettext:c-format */
+		  (_("error: %B(%A) is too large (%#Lx bytes)"),
+		  abfd, sec, sz);
+	      return FALSE;
+	    }
+	}
+
+      if (!bfd_get_section_contents (abfd, sec, p, 0, sz))
+	{
+	  if (*ptr != p)
+	    free (p);
+	  return FALSE;
+	}
+      *ptr = p;
+      return TRUE;
+
+    case DECOMPRESS_SECTION_SIZED:
+      /* Read in the full compressed section contents.  */
+      compressed_buffer = (bfd_byte *) bfd_malloc (sec->compressed_size);
+      if (compressed_buffer == NULL)
+	return FALSE;
+      save_rawsize = sec->rawsize;
+      save_size = sec->size;
+      /* Clear rawsize, set size to compressed size and set compress_status
+	 to COMPRESS_SECTION_NONE.  If the compressed size is bigger than
+	 the uncompressed size, bfd_get_section_contents will fail.  */
+      sec->rawsize = 0;
+      sec->size = sec->compressed_size;
+      sec->compress_status = COMPRESS_SECTION_NONE;
+      ret = bfd_get_section_contents (abfd, sec, compressed_buffer,
+				      0, sec->compressed_size);
+      /* Restore rawsize and size.  */
+      sec->rawsize = save_rawsize;
+      sec->size = save_size;
+      sec->compress_status = DECOMPRESS_SECTION_SIZED;
+      if (!ret)
+	goto fail_compressed;
+
+      if (p == NULL)
+	p = (bfd_byte *) bfd_malloc (sz);
+      if (p == NULL)
+	goto fail_compressed;
+
+      compression_header_size = bfd_get_compression_header_size (abfd, sec);
+      if (compression_header_size == 0)
+	/* Set header size to the zlib header size if it is a
+	   SHF_COMPRESSED section.  */
+	compression_header_size = 12;
+      if (!decompress_contents (compressed_buffer + compression_header_size,
+				sec->compressed_size - compression_header_size, p, sz))
+	{
+	  bfd_set_error (bfd_error_bad_value);
+	  if (p != *ptr)
+	    free (p);
+	fail_compressed:
+	  free (compressed_buffer);
+	  return FALSE;
+	}
+
+      free (compressed_buffer);
+      *ptr = p;
+      return TRUE;
+
+    case COMPRESS_SECTION_DONE:
+      if (sec->contents == NULL)
+	return FALSE;
+      if (p == NULL)
+	{
+	  p = (bfd_byte *) bfd_malloc (sz);
+	  if (p == NULL)
+	    return FALSE;
+	  *ptr = p;
+	}
+      /* PR 17512; file: 5bc29788.  */
+      if (p != sec->contents)
+	memcpy (p, sec->contents, sz);
+      return TRUE;
+
+    default:
+      abort ();
+    }
+}
+
+/*
+FUNCTION
+	bfd_cache_section_contents
+
+SYNOPSIS
+	void bfd_cache_section_contents
+	  (asection *sec, void *contents);
+
+DESCRIPTION
+	Stash @var(contents) so any following reads of @var(sec) do
+	not need to decompress again.
+*/
+
+void
+bfd_cache_section_contents (asection *sec, void *contents)
+{
+  if (sec->compress_status == DECOMPRESS_SECTION_SIZED)
+    sec->compress_status = COMPRESS_SECTION_DONE;
+  sec->contents = contents;
+  sec->flags |= SEC_IN_MEMORY;
+}
+
+/*
+FUNCTION
+	bfd_is_section_compressed_with_header
+
+SYNOPSIS
+	bfd_boolean bfd_is_section_compressed_with_header
+	  (bfd *abfd, asection *section,
+	  int *compression_header_size_p,
+	  bfd_size_type *uncompressed_size_p);
+
+DESCRIPTION
+	Return @code{TRUE} if @var{section} is compressed.  Compression
+	header size is returned in @var{compression_header_size_p} and
+	uncompressed size is returned in @var{uncompressed_size_p}.  If
+	compression is unsupported, compression header size is returned
+	with -1 and uncompressed size is returned with 0.
+*/
+
+bfd_boolean
+bfd_is_section_compressed_with_header (bfd *abfd, sec_ptr sec,
+				       int *compression_header_size_p,
+				       bfd_size_type *uncompressed_size_p)
+{
+  bfd_byte header[MAX_COMPRESSION_HEADER_SIZE];
+  int compression_header_size;
+  int header_size;
+  unsigned int saved = sec->compress_status;
+  bfd_boolean compressed;
+
+  compression_header_size = bfd_get_compression_header_size (abfd, sec);
+  if (compression_header_size > MAX_COMPRESSION_HEADER_SIZE)
+    abort ();
+  header_size = compression_header_size ? compression_header_size : 12;
+
+  /* Don't decompress the section.  */
+  sec->compress_status = COMPRESS_SECTION_NONE;
+
+  /* Read the header.  */
+  if (bfd_get_section_contents (abfd, sec, header, 0, header_size))
+    {
+      if (compression_header_size == 0)
+	/* In this case, it should be "ZLIB" followed by the uncompressed
+	   section size, 8 bytes in big-endian order.  */
+	compressed = CONST_STRNEQ ((char*) header , "ZLIB");
+      else
+	compressed = TRUE;
+    }
+  else
+    compressed = FALSE;
+
+  *uncompressed_size_p = sec->size;
+  if (compressed)
+    {
+      if (compression_header_size != 0)
+	{
+	  if (!bfd_check_compression_header (abfd, header, sec,
+					     uncompressed_size_p))
+	    compression_header_size = -1;
+	}
+      /* Check for the pathalogical case of a debug string section that
+	 contains the string ZLIB.... as the first entry.  We assume that
+	 no uncompressed .debug_str section would ever be big enough to
+	 have the first byte of its (big-endian) size be non-zero.  */
+      else if (strcmp (sec->name, ".debug_str") == 0
+	       && ISPRINT (header[4]))
+	compressed = FALSE;
+      else
+	*uncompressed_size_p = bfd_getb64 (header + 4);
+    }
+
+  /* Restore compress_status.  */
+  sec->compress_status = saved;
+  *compression_header_size_p = compression_header_size;
+  return compressed;
+}
+
+/*
+FUNCTION
+	bfd_is_section_compressed
+
+SYNOPSIS
+	bfd_boolean bfd_is_section_compressed
+	  (bfd *abfd, asection *section);
+
+DESCRIPTION
+	Return @code{TRUE} if @var{section} is compressed.
+*/
+
+bfd_boolean
+bfd_is_section_compressed (bfd *abfd, sec_ptr sec)
+{
+  int compression_header_size;
+  bfd_size_type uncompressed_size;
+  return (bfd_is_section_compressed_with_header (abfd, sec,
+						 &compression_header_size,
+						 &uncompressed_size)
+	  && compression_header_size >= 0
+	  && uncompressed_size > 0);
+}
+
+/*
+FUNCTION
+	bfd_init_section_decompress_status
+
+SYNOPSIS
+	bfd_boolean bfd_init_section_decompress_status
+	  (bfd *abfd, asection *section);
+
+DESCRIPTION
+	Record compressed section size, update section size with
+	decompressed size and set compress_status to
+	DECOMPRESS_SECTION_SIZED.
+
+	Return @code{FALSE} if the section is not a valid compressed
+	section.  Otherwise, return @code{TRUE}.
+*/
+
+bfd_boolean
+bfd_init_section_decompress_status (bfd *abfd, sec_ptr sec)
+{
+  bfd_byte header[MAX_COMPRESSION_HEADER_SIZE];
+  int compression_header_size;
+  int header_size;
+  bfd_size_type uncompressed_size;
+
+  compression_header_size = bfd_get_compression_header_size (abfd, sec);
+  if (compression_header_size > MAX_COMPRESSION_HEADER_SIZE)
+    abort ();
+  header_size = compression_header_size ? compression_header_size : 12;
+
+  /* Read the header.  */
+  if (sec->rawsize != 0
+      || sec->contents != NULL
+      || sec->compress_status != COMPRESS_SECTION_NONE
+      || !bfd_get_section_contents (abfd, sec, header, 0, header_size))
+    {
+      bfd_set_error (bfd_error_invalid_operation);
+      return FALSE;
+    }
+
+  if (compression_header_size == 0)
+    {
+      /* In this case, it should be "ZLIB" followed by the uncompressed
+	 section size, 8 bytes in big-endian order.  */
+      if (! CONST_STRNEQ ((char*) header, "ZLIB"))
+	{
+	  bfd_set_error (bfd_error_wrong_format);
+	  return FALSE;
+	}
+      uncompressed_size = bfd_getb64 (header + 4);
+    }
+  else if (!bfd_check_compression_header (abfd, header, sec,
+					 &uncompressed_size))
+    {
+      bfd_set_error (bfd_error_wrong_format);
+      return FALSE;
+    }
+
+  sec->compressed_size = sec->size;
+  sec->size = uncompressed_size;
+  sec->compress_status = DECOMPRESS_SECTION_SIZED;
+
+  return TRUE;
+}
+
+/*
+FUNCTION
+	bfd_init_section_compress_status
+
+SYNOPSIS
+	bfd_boolean bfd_init_section_compress_status
+	  (bfd *abfd, asection *section);
+
+DESCRIPTION
+	If open for read, compress section, update section size with
+	compressed size and set compress_status to COMPRESS_SECTION_DONE.
+
+	Return @code{FALSE} if the section is not a valid compressed
+	section.  Otherwise, return @code{TRUE}.
+*/
+
+bfd_boolean
+bfd_init_section_compress_status (bfd *abfd, sec_ptr sec)
+{
+  bfd_size_type uncompressed_size;
+  bfd_byte *uncompressed_buffer;
+
+  /* Error if not opened for read.  */
+  if (abfd->direction != read_direction
+      || sec->size == 0
+      || sec->rawsize != 0
+      || sec->contents != NULL
+      || sec->compress_status != COMPRESS_SECTION_NONE)
+    {
+      bfd_set_error (bfd_error_invalid_operation);
+      return FALSE;
+    }
+
+  /* Read in the full section contents and compress it.  */
+  uncompressed_size = sec->size;
+  uncompressed_buffer = (bfd_byte *) bfd_malloc (uncompressed_size);
+  /* PR 21431 */
+  if (uncompressed_buffer == NULL)
+    return FALSE;
+
+  if (!bfd_get_section_contents (abfd, sec, uncompressed_buffer,
+				 0, uncompressed_size))
+    return FALSE;
+
+  uncompressed_size = bfd_compress_section_contents (abfd, sec,
+						     uncompressed_buffer,
+						     uncompressed_size);
+  return uncompressed_size != 0;
+}
+
+/*
+FUNCTION
+	bfd_compress_section
+
+SYNOPSIS
+	bfd_boolean bfd_compress_section
+	  (bfd *abfd, asection *section, bfd_byte *uncompressed_buffer);
+
+DESCRIPTION
+	If open for write, compress section, update section size with
+	compressed size and set compress_status to COMPRESS_SECTION_DONE.
+
+	Return @code{FALSE} if compression fail.  Otherwise, return
+	@code{TRUE}.
+*/
+
+bfd_boolean
+bfd_compress_section (bfd *abfd, sec_ptr sec, bfd_byte *uncompressed_buffer)
+{
+  bfd_size_type uncompressed_size = sec->size;
+
+  /* Error if not opened for write.  */
+  if (abfd->direction != write_direction
+      || uncompressed_size == 0
+      || uncompressed_buffer == NULL
+      || sec->contents != NULL
+      || sec->compressed_size != 0
+      || sec->compress_status != COMPRESS_SECTION_NONE)
+    {
+      bfd_set_error (bfd_error_invalid_operation);
+      return FALSE;
+    }
+
+  /* Compress it.  */
+  return bfd_compress_section_contents (abfd, sec, uncompressed_buffer,
+					uncompressed_size) != 0;
+}