1 /* Common hooks for ARM. 2 Copyright (C) 1991-2015 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 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 (ARM_DWARF_UNWIND_TABLES) 52 return UI_DWARF2; 53 54 /* If not using ARM EABI unwind tables... */ 55 if (ARM_UNWIND_INFO) 56 { 57 /* For simplicity elsewhere in this file, indicate that all unwind 58 info is disabled if we're not emitting unwind tables. */ 59 if (!opts->x_flag_exceptions && !opts->x_flag_unwind_tables) 60 return UI_NONE; 61 else 62 return UI_TARGET; 63 } 64 65 /* ... we use sjlj exceptions for backwards compatibility. */ 66 return UI_SJLJ; 67 } 68 69 #define ARM_CPU_NAME_LENGTH 20 70 71 /* Truncate NAME at the first '.' character seen, or return 72 NAME unmodified. */ 73 74 const char * 75 arm_rewrite_selected_cpu (const char *name) 76 { 77 static char output_buf[ARM_CPU_NAME_LENGTH + 1] = {0}; 78 char *arg_pos; 79 80 strncpy (output_buf, name, ARM_CPU_NAME_LENGTH); 81 arg_pos = strchr (output_buf, '.'); 82 83 /* If we found a '.' truncate the entry at that point. */ 84 if (arg_pos) 85 *arg_pos = '\0'; 86 87 return output_buf; 88 } 89 90 /* Called by the driver to rewrite a name passed to the -mcpu 91 argument in preparation to be passed to the assembler. The 92 names passed from the command line will be in ARGV, we want 93 to use the right-most argument, which should be in 94 ARGV[ARGC - 1]. ARGC should always be greater than 0. */ 95 96 const char * 97 arm_rewrite_mcpu (int argc, const char **argv) 98 { 99 gcc_assert (argc); 100 return arm_rewrite_selected_cpu (argv[argc - 1]); 101 } 102 103 #undef ARM_CPU_NAME_LENGTH 104 105 106 #undef TARGET_DEFAULT_TARGET_FLAGS 107 #define TARGET_DEFAULT_TARGET_FLAGS (TARGET_DEFAULT | MASK_SCHED_PROLOG) 108 109 #undef TARGET_OPTION_OPTIMIZATION_TABLE 110 #define TARGET_OPTION_OPTIMIZATION_TABLE arm_option_optimization_table 111 112 #undef TARGET_EXCEPT_UNWIND_INFO 113 #define TARGET_EXCEPT_UNWIND_INFO arm_except_unwind_info 114 115 struct gcc_targetm_common targetm_common = TARGETM_COMMON_INITIALIZER; 116