| 1 | /* Target-dependent code for Analog Devices Blackfin processor, for GDB. |
| 2 | |
| 3 | Copyright (C) 2005-2019 Free Software Foundation, Inc. |
| 4 | |
| 5 | Contributed by Analog Devices, Inc. |
| 6 | |
| 7 | This file is part of GDB. |
| 8 | |
| 9 | This program is free software; you can redistribute it and/or modify |
| 10 | it under the terms of the GNU General Public License as published by |
| 11 | the Free Software Foundation; either version 3 of the License, or |
| 12 | (at your option) any later version. |
| 13 | |
| 14 | This program is distributed in the hope that it will be useful, |
| 15 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 17 | GNU General Public License for more details. |
| 18 | |
| 19 | You should have received a copy of the GNU General Public License |
| 20 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| 21 | |
| 22 | #include "defs.h" |
| 23 | #include "arch-utils.h" |
| 24 | #include "regcache.h" |
| 25 | #include "tramp-frame.h" |
| 26 | #include "trad-frame.h" |
| 27 | #include "osabi.h" |
| 28 | #include "xml-syscall.h" |
| 29 | #include "linux-tdep.h" |
| 30 | #include "bfin-tdep.h" |
| 31 | |
| 32 | /* From <asm/sigcontext.h>. */ |
| 33 | |
| 34 | #define SIGCONTEXT_OFFSET 168 |
| 35 | |
| 36 | static const int bfin_linux_sigcontext_reg_offset[BFIN_NUM_REGS] = |
| 37 | { |
| 38 | 0 * 4, /* %r0 */ |
| 39 | 1 * 4, /* %r1 */ |
| 40 | 2 * 4, /* %r2 */ |
| 41 | 3 * 4, /* %r3 */ |
| 42 | 4 * 4, /* %r4 */ |
| 43 | 5 * 4, /* %r5 */ |
| 44 | 6 * 4, /* %r6 */ |
| 45 | 7 * 4, /* %r7 */ |
| 46 | 8 * 4, /* %p0 */ |
| 47 | 9 * 4, /* %p1 */ |
| 48 | 10 * 4, /* %p2 */ |
| 49 | 11 * 4, /* %p3 */ |
| 50 | 12 * 4, /* %p4 */ |
| 51 | 13 * 4, /* %p5 */ |
| 52 | 14 * 4, /* %sp */ |
| 53 | 23 * 4, /* %fp */ |
| 54 | 24 * 4, /* %i0 */ |
| 55 | 25 * 4, /* %i1 */ |
| 56 | 26 * 4, /* %i2 */ |
| 57 | 27 * 4, /* %i3 */ |
| 58 | 28 * 4, /* %m0 */ |
| 59 | 29 * 4, /* %m1 */ |
| 60 | 30 * 4, /* %m2 */ |
| 61 | 31 * 4, /* %m3 */ |
| 62 | 36 * 4, /* %b0 */ |
| 63 | 37 * 4, /* %b1 */ |
| 64 | 38 * 4, /* %b2 */ |
| 65 | 39 * 4, /* %b3 */ |
| 66 | 32 * 4, /* %l0 */ |
| 67 | 33 * 4, /* %l1 */ |
| 68 | 34 * 4, /* %l2 */ |
| 69 | 35 * 4, /* %l3 */ |
| 70 | 17 * 4, /* %a0x */ |
| 71 | 15 * 4, /* %a0w */ |
| 72 | 18 * 4, /* %a1x */ |
| 73 | 16 * 4, /* %a1w */ |
| 74 | 19 * 4, /* %astat */ |
| 75 | 20 * 4, /* %rets */ |
| 76 | 40 * 4, /* %lc0 */ |
| 77 | 42 * 4, /* %lt0 */ |
| 78 | 44 * 4, /* %lb0 */ |
| 79 | 41 * 4, /* %lc1 */ |
| 80 | 43 * 4, /* %lt1 */ |
| 81 | 45 * 4, /* %lb1 */ |
| 82 | -1, /* %cycles */ |
| 83 | -1, /* %cycles2 */ |
| 84 | -1, /* %usp */ |
| 85 | 46 * 4, /* %seqstat */ |
| 86 | -1, /* syscfg */ |
| 87 | 21 * 4, /* %reti */ |
| 88 | 22 * 4, /* %retx */ |
| 89 | -1, /* %retn */ |
| 90 | -1, /* %rete */ |
| 91 | 21 * 4, /* %pc */ |
| 92 | }; |
| 93 | |
| 94 | /* Signal trampolines. */ |
| 95 | |
| 96 | static void |
| 97 | bfin_linux_sigframe_init (const struct tramp_frame *self, |
| 98 | struct frame_info *this_frame, |
| 99 | struct trad_frame_cache *this_cache, |
| 100 | CORE_ADDR func) |
| 101 | { |
| 102 | CORE_ADDR sp = get_frame_sp (this_frame); |
| 103 | CORE_ADDR pc = get_frame_pc (this_frame); |
| 104 | CORE_ADDR sigcontext = sp + SIGCONTEXT_OFFSET; |
| 105 | const int *reg_offset = bfin_linux_sigcontext_reg_offset; |
| 106 | int i; |
| 107 | |
| 108 | for (i = 0; i < BFIN_NUM_REGS; i++) |
| 109 | if (reg_offset[i] != -1) |
| 110 | trad_frame_set_reg_addr (this_cache, i, sigcontext + reg_offset[i]); |
| 111 | |
| 112 | /* This would come after the LINK instruction in the ret_from_signal |
| 113 | function, hence the frame id would be SP + 8. */ |
| 114 | trad_frame_set_id (this_cache, frame_id_build (sp + 8, pc)); |
| 115 | } |
| 116 | |
| 117 | static const struct tramp_frame bfin_linux_sigframe = |
| 118 | { |
| 119 | SIGTRAMP_FRAME, |
| 120 | 4, |
| 121 | { |
| 122 | { 0x00ADE128, 0xffffffff }, /* P0 = __NR_rt_sigreturn; */ |
| 123 | { 0x00A0, 0xffff }, /* EXCPT 0; */ |
| 124 | { TRAMP_SENTINEL_INSN, ULONGEST_MAX }, |
| 125 | }, |
| 126 | bfin_linux_sigframe_init, |
| 127 | }; |
| 128 | |
| 129 | static LONGEST |
| 130 | bfin_linux_get_syscall_number (struct gdbarch *gdbarch, |
| 131 | thread_info *thread) |
| 132 | { |
| 133 | struct regcache *regcache = get_thread_regcache (thread); |
| 134 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
| 135 | /* The content of a register. */ |
| 136 | gdb_byte buf[4]; |
| 137 | /* The result. */ |
| 138 | LONGEST ret; |
| 139 | |
| 140 | /* Getting the system call number from the register. |
| 141 | When dealing with Blackfin architecture, this information |
| 142 | is stored at %p0 register. */ |
| 143 | regcache->cooked_read (BFIN_P0_REGNUM, buf); |
| 144 | |
| 145 | ret = extract_signed_integer (buf, 4, byte_order); |
| 146 | |
| 147 | return ret; |
| 148 | } |
| 149 | |
| 150 | static void |
| 151 | bfin_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) |
| 152 | { |
| 153 | linux_init_abi (info, gdbarch); |
| 154 | |
| 155 | /* Set the sigtramp frame sniffer. */ |
| 156 | tramp_frame_prepend_unwinder (gdbarch, &bfin_linux_sigframe); |
| 157 | |
| 158 | /* Functions for 'catch syscall'. */ |
| 159 | set_xml_syscall_file_name (gdbarch, "syscalls/bfin-linux.xml"); |
| 160 | set_gdbarch_get_syscall_number (gdbarch, |
| 161 | bfin_linux_get_syscall_number); |
| 162 | } |
| 163 | |
| 164 | void |
| 165 | _initialize_bfin_linux_tdep (void) |
| 166 | { |
| 167 | gdbarch_register_osabi (bfd_arch_bfin, 0, GDB_OSABI_LINUX, |
| 168 | bfin_linux_init_abi); |
| 169 | } |