| 1 | /* BFD support for the ARC processor |
| 2 | Copyright (C) 1994-2020 Free Software Foundation, Inc. |
| 3 | Contributed by Doug Evans (dje@cygnus.com). |
| 4 | |
| 5 | This file is part of BFD, the Binary File Descriptor library. |
| 6 | |
| 7 | This program is free software; you can redistribute it and/or modify |
| 8 | it under the terms of the GNU General Public License as published by |
| 9 | the Free Software Foundation; either version 3 of the License, or |
| 10 | (at your option) any later version. |
| 11 | |
| 12 | This program is distributed in the hope that it will be useful, |
| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | GNU General Public License for more details. |
| 16 | |
| 17 | You should have received a copy of the GNU General Public License |
| 18 | along with this program; if not, write to the Free Software |
| 19 | Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, |
| 20 | MA 02110-1301, USA. */ |
| 21 | |
| 22 | #include "sysdep.h" |
| 23 | #include "bfd.h" |
| 24 | #include "libbfd.h" |
| 25 | |
| 26 | static const bfd_arch_info_type * |
| 27 | arc_compatible (const bfd_arch_info_type *a, const bfd_arch_info_type *b); |
| 28 | |
| 29 | #define ARC(mach, print_name, default_p, next) \ |
| 30 | { \ |
| 31 | 32, /* Bits in a word. */ \ |
| 32 | 32, /* Bits in an address. */ \ |
| 33 | 8, /* Bits in a byte. */ \ |
| 34 | bfd_arch_arc, \ |
| 35 | mach, \ |
| 36 | "arc", \ |
| 37 | print_name, \ |
| 38 | 4, /* Section alignment power. */ \ |
| 39 | default_p, \ |
| 40 | arc_compatible, \ |
| 41 | bfd_default_scan, \ |
| 42 | bfd_arch_default_fill, \ |
| 43 | next, \ |
| 44 | 0 /* Maximum offset of a reloc from the start of an insn. */ \ |
| 45 | } |
| 46 | |
| 47 | static const bfd_arch_info_type arch_info_struct[] = |
| 48 | { |
| 49 | ARC (bfd_mach_arc_arc600, "A6" , FALSE, &arch_info_struct[1]), |
| 50 | ARC (bfd_mach_arc_arc601, "ARC601", FALSE, &arch_info_struct[2]), |
| 51 | ARC (bfd_mach_arc_arc700, "ARC700", FALSE, &arch_info_struct[3]), |
| 52 | ARC (bfd_mach_arc_arc700, "A7", FALSE, &arch_info_struct[4]), |
| 53 | ARC (bfd_mach_arc_arcv2, "ARCv2", FALSE, &arch_info_struct[5]), |
| 54 | ARC (bfd_mach_arc_arcv2, "EM", FALSE, &arch_info_struct[6]), |
| 55 | ARC (bfd_mach_arc_arcv2, "HS", FALSE, NULL), |
| 56 | }; |
| 57 | |
| 58 | const bfd_arch_info_type bfd_arc_arch = |
| 59 | ARC (bfd_mach_arc_arc600, "ARC600", TRUE, &arch_info_struct[0]); |
| 60 | |
| 61 | /* ARC-specific "compatible" function. The general rule is that if A and B are |
| 62 | compatible, then this function should return architecture that is more |
| 63 | "feature-rich", that is, can run both A and B. ARCv2, EM and HS all has |
| 64 | same mach number, so bfd_default_compatible assumes they are the same, and |
| 65 | returns an A. That causes issues with GDB, because GDB assumes that if |
| 66 | machines are compatible, then "compatible ()" always returns same machine |
| 67 | regardless of argument order. As a result GDB gets confused because, for |
| 68 | example, compatible (ARCv2, EM) returns ARCv2, but compatible (EM, ARCv2) |
| 69 | returns EM, hence GDB is not sure if they are compatible and prints a |
| 70 | warning. */ |
| 71 | |
| 72 | static const bfd_arch_info_type * |
| 73 | arc_compatible (const bfd_arch_info_type *a, const bfd_arch_info_type *b) |
| 74 | { |
| 75 | const bfd_arch_info_type * const em = &arch_info_struct[5]; |
| 76 | const bfd_arch_info_type * const hs = &arch_info_struct[6]; |
| 77 | |
| 78 | /* Trivial case where a and b is the same instance. Some callers already |
| 79 | check this condition but some do not and get an invalid result. */ |
| 80 | if (a == b) |
| 81 | return a; |
| 82 | |
| 83 | /* If a & b are for different architecture we can do nothing. */ |
| 84 | if (a->arch != b->arch) |
| 85 | return NULL; |
| 86 | |
| 87 | if (a->bits_per_word != b->bits_per_word) |
| 88 | return NULL; |
| 89 | |
| 90 | /* ARCv2|EM and EM. */ |
| 91 | if ((a->mach == bfd_mach_arc_arcv2 && b == em) |
| 92 | || (b->mach == bfd_mach_arc_arcv2 && a == em)) |
| 93 | return em; |
| 94 | |
| 95 | /* ARCv2|HS and HS. */ |
| 96 | if ((a->mach == bfd_mach_arc_arcv2 && b == hs) |
| 97 | || (b->mach == bfd_mach_arc_arcv2 && a == hs)) |
| 98 | return hs; |
| 99 | |
| 100 | return bfd_default_compatible (a, b); |
| 101 | } |