1# This shell script emits a C file. -*- C -*-
2#   Copyright 2003, 2005 Free Software Foundation, Inc.
3#
4# This file is part of GLD, the Gnu Linker.
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 2 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, MA 02110-1301, USA.
19#
20
21# This file is sourced from elf32.em, and defines extra powerpc32-elf
22# specific routines.
23#
24cat >>e${EMULATION_NAME}.c <<EOF
25
26#include "libbfd.h"
27#include "elf32-ppc.h"
28
29extern const bfd_target bfd_elf32_powerpc_vec;
30extern const bfd_target bfd_elf32_powerpcle_vec;
31extern const bfd_target bfd_elf32_powerpc_vxworks_vec;
32
33static inline int
34is_ppc_elf32_vec(const bfd_target * vec)
35{
36  return (vec == &bfd_elf32_powerpc_vec
37	  || vec == &bfd_elf32_powerpc_vxworks_vec
38	  || vec == &bfd_elf32_powerpcle_vec);
39}
40
41/* Whether to run tls optimization.  */
42static int notlsopt = 0;
43
44/* Whether to emit symbols for stubs.  */
45static int emit_stub_syms = 0;
46
47/* Chooses the correct place for .plt and .got.  */
48static int old_plt = 0;
49static int old_got = 0;
50
51static void
52ppc_after_open (void)
53{
54  if (is_ppc_elf32_vec (link_info.hash->creator))
55    {
56      int new_plt;
57      int keep_new;
58      unsigned int num_plt;
59      unsigned int num_got;
60      lang_output_section_statement_type *os;
61      lang_output_section_statement_type *plt_os[2];
62      lang_output_section_statement_type *got_os[2];
63
64      emit_stub_syms |= link_info.emitrelocations;
65      new_plt = ppc_elf_select_plt_layout (output_bfd, &link_info, old_plt,
66					   emit_stub_syms);
67      if (new_plt < 0)
68	einfo ("%X%P: select_plt_layout problem %E\n");
69
70      num_got = 0;
71      num_plt = 0;
72      for (os = &lang_output_section_statement.head->output_section_statement;
73	   os != NULL;
74	   os = os->next)
75	{
76	  if (os->constraint == SPECIAL && strcmp (os->name, ".plt") == 0)
77	    {
78	      if (num_plt < 2)
79		plt_os[num_plt] = os;
80	      ++num_plt;
81	    }
82	  if (os->constraint == SPECIAL && strcmp (os->name, ".got") == 0)
83	    {
84	      if (num_got < 2)
85		got_os[num_got] = os;
86	      ++num_got;
87	    }
88	}
89
90      keep_new = new_plt == 1 ? 0 : -1;
91      if (num_plt == 2)
92	{
93	  plt_os[0]->constraint = keep_new;
94	  plt_os[1]->constraint = ~keep_new;
95	}
96      if (num_got == 2)
97	{
98	  if (old_got)
99	    keep_new = -1;
100	  got_os[0]->constraint = keep_new;
101	  got_os[1]->constraint = ~keep_new;
102	}
103    }
104
105  gld${EMULATION_NAME}_after_open ();
106}
107
108static void
109ppc_before_allocation (void)
110{
111  if (is_ppc_elf32_vec (link_info.hash->creator))
112    {
113      if (ppc_elf_tls_setup (output_bfd, &link_info) && !notlsopt)
114	{
115	  if (!ppc_elf_tls_optimize (output_bfd, &link_info))
116	    {
117	      einfo ("%X%P: TLS problem %E\n");
118	      return;
119	    }
120	}
121    }
122  gld${EMULATION_NAME}_before_allocation ();
123}
124
125EOF
126
127# Define some shell vars to insert bits of code into the standard elf
128# parse_args and list_options functions.
129#
130PARSE_AND_LIST_PROLOGUE='
131#define OPTION_NO_TLS_OPT		301
132#define OPTION_OLD_PLT			302
133#define OPTION_OLD_GOT			303
134#define OPTION_STUBSYMS			304
135'
136
137PARSE_AND_LIST_LONGOPTS='
138  { "emit-stub-syms", no_argument, NULL, OPTION_STUBSYMS },
139  { "no-tls-optimize", no_argument, NULL, OPTION_NO_TLS_OPT },
140  { "bss-plt", no_argument, NULL, OPTION_OLD_PLT },
141  { "sdata-got", no_argument, NULL, OPTION_OLD_GOT },
142'
143
144PARSE_AND_LIST_OPTIONS='
145  fprintf (file, _("\
146  --emit-stub-syms      Label linker stubs with a symbol.\n\
147  --no-tls-optimize     Don'\''t try to optimize TLS accesses.\n\
148  --bss-plt             Force old-style BSS PLT.\n\
149  --sdata-got           Force GOT location just before .sdata.\n"
150		   ));
151'
152
153PARSE_AND_LIST_ARGS_CASES='
154    case OPTION_STUBSYMS:
155      emit_stub_syms = 1;
156      break;
157
158    case OPTION_NO_TLS_OPT:
159      notlsopt = 1;
160      break;
161
162    case OPTION_OLD_PLT:
163      old_plt = 1;
164      break;
165
166    case OPTION_OLD_GOT:
167      old_got = 1;
168      break;
169'
170
171# Put these extra ppc32elf routines in ld_${EMULATION_NAME}_emulation
172#
173LDEMUL_AFTER_OPEN=ppc_after_open
174LDEMUL_BEFORE_ALLOCATION=ppc_before_allocation
175