1# This shell script emits a C file. -*- C -*-
2#   Copyright (C) 2003-2016 Free Software Foundation, Inc.
3#
4# This file is part of the GNU Binutils.
5#
6# This program is free software; you can redistribute it and/or modify
7# it under the terms of the GNU General Public License as published by
8# the Free Software Foundation; either version 3 of the License, or
9# (at your option) any later version.
10#
11# This program is distributed in the hope that it will be useful,
12# but WITHOUT ANY WARRANTY; without even the implied warranty of
13# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14# GNU General Public License for more details.
15#
16# You should have received a copy of the GNU General Public License
17# along with this program; if not, write to the Free Software
18# Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
19# MA 02110-1301, USA.
20#
21
22# This file is sourced from elf32.em, and defines extra alpha
23# specific routines.
24#
25fragment <<EOF
26
27#include "elf/internal.h"
28#include "elf/alpha.h"
29#include "elf-bfd.h"
30
31static bfd_boolean limit_32bit;
32
33extern bfd_boolean elf64_alpha_use_secureplt;
34
35
36/* Set the start address as in the Tru64 ld.  */
37#define ALPHA_TEXT_START_32BIT 0x12000000
38
39static void
40alpha_after_open (void)
41{
42  if (bfd_get_flavour (link_info.output_bfd) == bfd_target_elf_flavour
43      && elf_object_id (link_info.output_bfd) == ALPHA_ELF_DATA)
44    {
45      unsigned int num_plt;
46      lang_output_section_statement_type *os;
47      lang_output_section_statement_type *plt_os[2];
48
49      num_plt = 0;
50      for (os = &lang_output_section_statement.head->output_section_statement;
51	   os != NULL;
52	   os = os->next)
53	{
54	  if (os->constraint == SPECIAL && strcmp (os->name, ".plt") == 0)
55	    {
56	      if (num_plt < 2)
57		plt_os[num_plt] = os;
58	      ++num_plt;
59	    }
60	}
61
62      if (num_plt == 2)
63	{
64	  plt_os[0]->constraint = elf64_alpha_use_secureplt ? 0 : -1;
65	  plt_os[1]->constraint = elf64_alpha_use_secureplt ? -1 : 0;
66	}
67    }
68
69  gld${EMULATION_NAME}_after_open ();
70}
71
72static void
73alpha_after_parse (void)
74{
75  link_info.relax_pass = 2;
76  if (limit_32bit
77      && !bfd_link_pic (&link_info)
78      && !bfd_link_relocatable (&link_info))
79    lang_section_start (".interp",
80			exp_binop ('+',
81				   exp_intop (ALPHA_TEXT_START_32BIT),
82				   exp_nameop (SIZEOF_HEADERS, NULL)),
83			NULL);
84
85  gld${EMULATION_NAME}_after_parse ();
86}
87
88static void
89alpha_before_allocation (void)
90{
91  /* Call main function; we're just extending it.  */
92  gld${EMULATION_NAME}_before_allocation ();
93
94  /* Add -relax if -O, not -r, and not explicitly disabled.  */
95  if (link_info.optimize
96      && !bfd_link_relocatable (&link_info)
97      && ! RELAXATION_DISABLED_BY_USER)
98    ENABLE_RELAXATION;
99}
100
101static void
102alpha_finish (void)
103{
104  if (limit_32bit)
105    elf_elfheader (link_info.output_bfd)->e_flags |= EF_ALPHA_32BIT;
106
107  finish_default ();
108}
109EOF
110
111# Define some shell vars to insert bits of code into the standard elf
112# parse_args and list_options functions.
113#
114PARSE_AND_LIST_PROLOGUE='
115#define OPTION_TASO		300
116#define OPTION_SECUREPLT	(OPTION_TASO + 1)
117#define OPTION_NO_SECUREPLT	(OPTION_SECUREPLT + 1)
118'
119
120PARSE_AND_LIST_LONGOPTS='
121  { "taso", no_argument, NULL, OPTION_TASO },
122  { "secureplt", no_argument, NULL, OPTION_SECUREPLT },
123  { "no-secureplt", no_argument, NULL, OPTION_NO_SECUREPLT },
124'
125
126PARSE_AND_LIST_OPTIONS='
127  fprintf (file, _("\
128  --taso                      Load executable in the lower 31-bit addressable\n\
129                                virtual address range.\n\
130  --secureplt                 Force PLT in text segment.\n\
131  --no-secureplt              Force PLT in data segment.\n\
132"));
133'
134
135PARSE_AND_LIST_ARGS_CASES='
136    case OPTION_TASO:
137      limit_32bit = 1;
138      break;
139    case OPTION_SECUREPLT:
140      elf64_alpha_use_secureplt = TRUE;
141      break;
142    case OPTION_NO_SECUREPLT:
143      elf64_alpha_use_secureplt = FALSE;
144      break;
145'
146
147# Put these extra alpha routines in ld_${EMULATION_NAME}_emulation
148#
149LDEMUL_AFTER_OPEN=alpha_after_open
150LDEMUL_AFTER_PARSE=alpha_after_parse
151LDEMUL_BEFORE_ALLOCATION=alpha_before_allocation
152LDEMUL_FINISH=alpha_finish
153