1 /* Common hooks for ARM.
2 Copyright (C) 1991-2016 Free Software Foundation, Inc.
3
4 This file is part of GCC.
5
6 GCC is free software; you can redistribute it and/or modify it
7 under the terms of the GNU General Public License as published
8 by the Free Software Foundation; either version 3, or (at your
9 option) any later version.
10
11 GCC is distributed in the hope that it will be useful, but WITHOUT
12 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
13 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
14 License for more details.
15
16 You should have received a copy of the GNU General Public License
17 along with GCC; see the file COPYING3. If not see
18 <http://www.gnu.org/licenses/>. */
19
20 #include "config.h"
21 #include "system.h"
22 #include "coretypes.h"
23 #include "tm.h"
24 #include "tm_p.h"
25 #include "common/common-target.h"
26 #include "common/common-target-def.h"
27 #include "opts.h"
28 #include "flags.h"
29
30 /* Set default optimization options. */
31 static const struct default_options arm_option_optimization_table[] =
32 {
33 /* Enable section anchors by default at -O1 or higher. */
34 { OPT_LEVELS_1_PLUS, OPT_fsection_anchors, NULL, 1 },
35 { OPT_LEVELS_1_PLUS, OPT_fomit_frame_pointer, NULL, 1 },
36 { OPT_LEVELS_1_PLUS, OPT_fsched_pressure, NULL, 1 },
37 { OPT_LEVELS_NONE, 0, NULL, 0 }
38 };
39
40 /* Implement TARGET_EXCEPT_UNWIND_INFO. */
41
42 enum unwind_info_type
arm_except_unwind_info(struct gcc_options * opts)43 arm_except_unwind_info (struct gcc_options *opts)
44 {
45 /* Honor the --enable-sjlj-exceptions configure switch. */
46 #ifdef CONFIG_SJLJ_EXCEPTIONS
47 if (CONFIG_SJLJ_EXCEPTIONS)
48 return UI_SJLJ;
49 #endif
50
51 /* If not using ARM EABI unwind tables... */
52 if (ARM_UNWIND_INFO)
53 {
54 /* For simplicity elsewhere in this file, indicate that all unwind
55 info is disabled if we're not emitting unwind tables. */
56 if (!opts->x_flag_exceptions && !opts->x_flag_unwind_tables)
57 return UI_NONE;
58 else
59 return UI_TARGET;
60 }
61
62 /* ... we use sjlj exceptions for backwards compatibility. */
63 return UI_SJLJ;
64 }
65
66 #define ARM_CPU_NAME_LENGTH 20
67
68 /* Truncate NAME at the first '.' character seen, or return
69 NAME unmodified. */
70
71 const char *
arm_rewrite_selected_cpu(const char * name)72 arm_rewrite_selected_cpu (const char *name)
73 {
74 static char output_buf[ARM_CPU_NAME_LENGTH + 1] = {0};
75 char *arg_pos;
76
77 strncpy (output_buf, name, ARM_CPU_NAME_LENGTH);
78 arg_pos = strchr (output_buf, '.');
79
80 /* If we found a '.' truncate the entry at that point. */
81 if (arg_pos)
82 *arg_pos = '\0';
83
84 return output_buf;
85 }
86
87 /* Called by the driver to rewrite a name passed to the -mcpu
88 argument in preparation to be passed to the assembler. The
89 names passed from the command line will be in ARGV, we want
90 to use the right-most argument, which should be in
91 ARGV[ARGC - 1]. ARGC should always be greater than 0. */
92
93 const char *
arm_rewrite_mcpu(int argc,const char ** argv)94 arm_rewrite_mcpu (int argc, const char **argv)
95 {
96 gcc_assert (argc);
97 return arm_rewrite_selected_cpu (argv[argc - 1]);
98 }
99
100 #undef ARM_CPU_NAME_LENGTH
101
102
103 #undef TARGET_DEFAULT_TARGET_FLAGS
104 #define TARGET_DEFAULT_TARGET_FLAGS (TARGET_DEFAULT | MASK_SCHED_PROLOG)
105
106 #undef TARGET_OPTION_OPTIMIZATION_TABLE
107 #define TARGET_OPTION_OPTIMIZATION_TABLE arm_option_optimization_table
108
109 #undef TARGET_EXCEPT_UNWIND_INFO
110 #define TARGET_EXCEPT_UNWIND_INFO arm_except_unwind_info
111
112 struct gcc_targetm_common targetm_common = TARGETM_COMMON_INITIALIZER;
113