From 88cdf2977590c1a5405c709b41f7d916f1c129f0 Mon Sep 17 00:00:00 2001
From: Nick Clifton <nickc@redhat.com>
Date: Fri, 28 Jul 2000 00:57:45 +0000
Subject: [PATCH] Implement -taso command line option.

---
 ld/ChangeLog                |  8 ++++
 ld/emulparams/elf64alpha.sh | 85 +++++++++++++++++++++++++++++++++++++
 2 files changed, 93 insertions(+)

diff --git a/ld/ChangeLog b/ld/ChangeLog
index d082eb86dd..24557cad8a 100644
--- a/ld/ChangeLog
+++ b/ld/ChangeLog
@@ -1,3 +1,11 @@
+2000-07-27  Ivan Kokshaysky  <ink@jurassic.park.msu.ru>
+
+	* emulparams/elf64alpha.sh: Implement "-taso" emulation
+	specific option to fit 64-bit executable in the lower
+	31-bit address range.  This is done by changing start
+	address of .interp (the very first section of executable)
+	and then setting EF_ALPHA_32BIT elf header flag.
+
 2000-07-21  Michael Sokolov  <msokolov@ivan.Harhan.ORG>
 
 	* emultempl/m68kcoff.em: New file.
diff --git a/ld/emulparams/elf64alpha.sh b/ld/emulparams/elf64alpha.sh
index afa21f2271..c3e4e52b8c 100644
--- a/ld/emulparams/elf64alpha.sh
+++ b/ld/emulparams/elf64alpha.sh
@@ -13,3 +13,88 @@ DATA_PLT=
 NOP=0x47ff041f
 
 OTHER_READONLY_SECTIONS='.reginfo : { *(.reginfo) }'
+
+# This code gets inserted into the generic elf32.sc linker script
+# and allows us to define our own command line switches.
+PARSE_AND_LIST_ARGS='
+#define OPTION_TASO            300
+/* Set the start address as in the Tru64 ld */
+#define ALPHA_TEXT_START_32BIT 0x12000000
+
+static int elf64alpha_32bit = 0;
+
+static struct option longopts[] =
+{
+  {"taso", no_argument, NULL, OPTION_TASO},
+  {NULL, no_argument, NULL, 0}
+};
+
+static void
+gld_elf64alpha_list_options (file)
+     FILE * file;
+{
+  fprintf (file, _(
+"  -taso                       Load executable in the lower 31-bit addressable
+                                virtual address range.\n"));
+}
+
+struct ld_emulation_xfer_struct ld_elf64alpha_emulation;
+static void gld_elf64alpha_finish ();
+
+static int
+gld_elf64alpha_parse_args (argc, argv)
+     int argc;
+     char ** argv;
+{
+  int        longind;
+  int        optc;
+  int        prevoptind = optind;
+  int        prevopterr = opterr;
+  int        wanterror;
+  static int lastoptind = -1;
+
+  if (lastoptind != optind)
+    opterr = 0;
+  
+  wanterror  = opterr;
+  lastoptind = optind;
+
+  optc   = getopt_long_only (argc, argv, "-", longopts, & longind);
+  opterr = prevopterr;
+
+  switch (optc)
+    {
+    default:
+      if (wanterror)
+       xexit (1);
+      optind =  prevoptind;
+      return 0;
+
+    case EOF:
+      if (elf64alpha_32bit && !link_info.shared && !link_info.relocateable)
+	{
+	  lang_section_start (".interp",
+			      exp_binop ('\''+'\'',
+					 exp_intop (ALPHA_TEXT_START_32BIT),
+					 exp_nameop (SIZEOF_HEADERS, NULL)));
+	  ld_elf64alpha_emulation.finish = gld_elf64alpha_finish;
+	}
+      return 0;
+
+    case OPTION_TASO:
+      elf64alpha_32bit = 1;
+      break;
+    }
+  
+  return 1;
+}
+
+#include "elf/internal.h"
+#include "elf/alpha.h"
+#include "elf-bfd.h"
+
+static void
+gld_elf64alpha_finish ()
+{
+  elf_elfheader (output_bfd)->e_flags |= EF_ALPHA_32BIT;
+}'