gdb/bfin-linux-tdep.c

   1 /* Target-dependent code for Analog Devices Blackfin processor, for GDB.
   2
   3    Copyright (C) 2005-2024 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 "arch-utils.h"
  23 #include "regcache.h"
  24 #include "tramp-frame.h"
  25 #include "trad-frame.h"
  26 #include "osabi.h"
  27 #include "xml-syscall.h"
  28 #include "linux-tdep.h"
  29 #include "bfin-tdep.h"
  30
  31 /* From <asm/sigcontext.h>.  */
  32
  33 #define SIGCONTEXT_OFFSET       168
  34
  35 static const int bfin_linux_sigcontext_reg_offset[BFIN_NUM_REGS] =
  36 {
  37   0 * 4,        /* %r0 */
  38   1 * 4,        /* %r1 */
  39   2 * 4,        /* %r2 */
  40   3 * 4,        /* %r3 */
  41   4 * 4,        /* %r4 */
  42   5 * 4,        /* %r5 */
  43   6 * 4,        /* %r6 */
  44   7 * 4,        /* %r7 */
  45   8 * 4,        /* %p0 */
  46   9 * 4,        /* %p1 */
  47   10 * 4,       /* %p2 */
  48   11 * 4,       /* %p3 */
  49   12 * 4,       /* %p4 */
  50   13 * 4,       /* %p5 */
  51   14 * 4,       /* %sp */
  52   23 * 4,       /* %fp */
  53   24 * 4,       /* %i0 */
  54   25 * 4,       /* %i1 */
  55   26 * 4,       /* %i2 */
  56   27 * 4,       /* %i3 */
  57   28 * 4,       /* %m0 */
  58   29 * 4,       /* %m1 */
  59   30 * 4,       /* %m2 */
  60   31 * 4,       /* %m3 */
  61   36 * 4,       /* %b0 */
  62   37 * 4,       /* %b1 */
  63   38 * 4,       /* %b2 */
  64   39 * 4,       /* %b3 */
  65   32 * 4,       /* %l0 */
  66   33 * 4,       /* %l1 */
  67   34 * 4,       /* %l2 */
  68   35 * 4,       /* %l3 */
  69   17 * 4,       /* %a0x */
  70   15 * 4,       /* %a0w */
  71   18 * 4,       /* %a1x */
  72   16 * 4,       /* %a1w */
  73   19 * 4,       /* %astat */
  74   20 * 4,       /* %rets */
  75   40 * 4,       /* %lc0 */
  76   42 * 4,       /* %lt0 */
  77   44 * 4,       /* %lb0 */
  78   41 * 4,       /* %lc1 */
  79   43 * 4,       /* %lt1 */
  80   45 * 4,       /* %lb1 */
  81   -1,           /* %cycles */
  82   -1,           /* %cycles2 */
  83   -1,           /* %usp */
  84   46 * 4,       /* %seqstat */
  85   -1,           /* syscfg */
  86   21 * 4,       /* %reti */
  87   22 * 4,       /* %retx */
  88   -1,           /* %retn */
  89   -1,           /* %rete */
  90   21 * 4,       /* %pc */
  91 };
  92
  93 /* Signal trampolines.  */
  94
  95 static void
  96 bfin_linux_sigframe_init (const struct tramp_frame *self,
  97                           const frame_info_ptr &this_frame,
  98                           struct trad_frame_cache *this_cache,
  99                           CORE_ADDR func)
 100 {
 101   CORE_ADDR sp = get_frame_sp (this_frame);
 102   CORE_ADDR pc = get_frame_pc (this_frame);
 103   CORE_ADDR sigcontext = sp + SIGCONTEXT_OFFSET;
 104   const int *reg_offset = bfin_linux_sigcontext_reg_offset;
 105   int i;
 106
 107   for (i = 0; i < BFIN_NUM_REGS; i++)
 108     if (reg_offset[i] != -1)
 109       trad_frame_set_reg_addr (this_cache, i, sigcontext + reg_offset[i]);
 110
 111   /* This would come after the LINK instruction in the ret_from_signal
 112      function, hence the frame id would be SP + 8.  */
 113   trad_frame_set_id (this_cache, frame_id_build (sp + 8, pc));
 114 }
 115
 116 static const struct tramp_frame bfin_linux_sigframe =
 117 {
 118   SIGTRAMP_FRAME,
 119   4,
 120   {
 121     { 0x00ADE128, 0xffffffff }, /* P0 = __NR_rt_sigreturn; */
 122     { 0x00A0, 0xffff },         /* EXCPT 0; */
 123     { TRAMP_SENTINEL_INSN, ULONGEST_MAX },
 124   },
 125   bfin_linux_sigframe_init,
 126 };
 127
 128 static LONGEST
 129 bfin_linux_get_syscall_number (struct gdbarch *gdbarch,
 130                                thread_info *thread)
 131 {
 132   struct regcache *regcache = get_thread_regcache (thread);
 133   enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
 134   /* The content of a register.  */
 135   gdb_byte buf[4];
 136   /* The result.  */
 137   LONGEST ret;
 138
 139   /* Getting the system call number from the register.
 140      When dealing with Blackfin architecture, this information
 141      is stored at %p0 register.  */
 142   regcache->cooked_read (BFIN_P0_REGNUM, buf);
 143
 144   ret = extract_signed_integer (buf, 4, byte_order);
 145
 146   return ret;
 147 }
 148
 149 static void
 150 bfin_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
 151 {
 152   linux_init_abi (info, gdbarch, 0);
 153
 154   /* Set the sigtramp frame sniffer.  */
 155   tramp_frame_prepend_unwinder (gdbarch, &bfin_linux_sigframe);
 156
 157   /* Functions for 'catch syscall'.  */
 158   set_xml_syscall_file_name (gdbarch, "syscalls/bfin-linux.xml");
 159   set_gdbarch_get_syscall_number (gdbarch,
 160                                   bfin_linux_get_syscall_number);
 161 }
 162
 163 void _initialize_bfin_linux_tdep ();
 164 void
 165 _initialize_bfin_linux_tdep ()
 166 {
 167   gdbarch_register_osabi (bfd_arch_bfin, 0, GDB_OSABI_LINUX,
 168                           bfin_linux_init_abi);
 169 }