gdb/gdbserver/linux-aarch64-ipa.c

   1 /* GNU/Linux/AArch64 specific low level interface, for the in-process
   2    agent library for GDB.
   3
   4    Copyright (C) 2015-2016 Free Software Foundation, Inc.
   5
   6    This file is part of GDB.
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  20
  21 #include "server.h"
  22 #include "tracepoint.h"
  23
  24 /* Defined in auto-generated file aarch64.c.  */
  25 void init_registers_aarch64 (void);
  26 extern const struct target_desc *tdesc_aarch64;
  27
  28 /* Each register saved by the jump pad is in a 16 byte cell.  */
  29 #define FT_CR_SIZE 16
  30
  31 #define FT_CR_FPCR      0
  32 #define FT_CR_FPSR      1
  33 #define FT_CR_CPSR      2
  34 #define FT_CR_PC        3
  35 #define FT_CR_SP        4
  36 #define FT_CR_X0        5
  37 #define FT_CR_GPR(n)    (FT_CR_X0 + (n))
  38 #define FT_CR_FPR(n)    (FT_CR_GPR (31) + (n))
  39
  40 /* Mapping between registers collected by the jump pad and GDB's register
  41    array layout used by regcache.
  42
  43    See linux-aarch64-low.c (aarch64_install_fast_tracepoint_jump_pad) for
  44    more details.  */
  45
  46 static const int aarch64_ft_collect_regmap[] = {
  47   FT_CR_GPR (0),
  48   FT_CR_GPR (1),
  49   FT_CR_GPR (2),
  50   FT_CR_GPR (3),
  51   FT_CR_GPR (4),
  52   FT_CR_GPR (5),
  53   FT_CR_GPR (6),
  54   FT_CR_GPR (7),
  55   FT_CR_GPR (8),
  56   FT_CR_GPR (9),
  57   FT_CR_GPR (10),
  58   FT_CR_GPR (11),
  59   FT_CR_GPR (12),
  60   FT_CR_GPR (13),
  61   FT_CR_GPR (14),
  62   FT_CR_GPR (15),
  63   FT_CR_GPR (16),
  64   FT_CR_GPR (17),
  65   FT_CR_GPR (18),
  66   FT_CR_GPR (19),
  67   FT_CR_GPR (20),
  68   FT_CR_GPR (21),
  69   FT_CR_GPR (22),
  70   FT_CR_GPR (23),
  71   FT_CR_GPR (24),
  72   FT_CR_GPR (25),
  73   FT_CR_GPR (26),
  74   FT_CR_GPR (27),
  75   FT_CR_GPR (28),
  76   /* FP */
  77   FT_CR_GPR (29),
  78   /* LR */
  79   FT_CR_GPR (30),
  80   FT_CR_SP,
  81   FT_CR_PC,
  82   FT_CR_CPSR,
  83   FT_CR_FPR (0),
  84   FT_CR_FPR (1),
  85   FT_CR_FPR (2),
  86   FT_CR_FPR (3),
  87   FT_CR_FPR (4),
  88   FT_CR_FPR (5),
  89   FT_CR_FPR (6),
  90   FT_CR_FPR (7),
  91   FT_CR_FPR (8),
  92   FT_CR_FPR (9),
  93   FT_CR_FPR (10),
  94   FT_CR_FPR (11),
  95   FT_CR_FPR (12),
  96   FT_CR_FPR (13),
  97   FT_CR_FPR (14),
  98   FT_CR_FPR (15),
  99   FT_CR_FPR (16),
 100   FT_CR_FPR (17),
 101   FT_CR_FPR (18),
 102   FT_CR_FPR (19),
 103   FT_CR_FPR (20),
 104   FT_CR_FPR (21),
 105   FT_CR_FPR (22),
 106   FT_CR_FPR (23),
 107   FT_CR_FPR (24),
 108   FT_CR_FPR (25),
 109   FT_CR_FPR (26),
 110   FT_CR_FPR (27),
 111   FT_CR_FPR (28),
 112   FT_CR_FPR (29),
 113   FT_CR_FPR (30),
 114   FT_CR_FPR (31),
 115   FT_CR_FPSR,
 116   FT_CR_FPCR
 117 };
 118
 119 #define AARCH64_NUM_FT_COLLECT_GREGS \
 120   (sizeof (aarch64_ft_collect_regmap) / sizeof(aarch64_ft_collect_regmap[0]))
 121
 122 /* Fill in REGCACHE with registers saved by the jump pad in BUF.  */
 123
 124 void
 125 supply_fast_tracepoint_registers (struct regcache *regcache,
 126                                   const unsigned char *buf)
 127 {
 128   int i;
 129
 130   for (i = 0; i < AARCH64_NUM_FT_COLLECT_GREGS; i++)
 131     supply_register (regcache, i,
 132                      ((char *) buf)
 133                      + (aarch64_ft_collect_regmap[i] * FT_CR_SIZE));
 134 }
 135
 136 IP_AGENT_EXPORT_FUNC ULONGEST
 137 gdb_agent_get_raw_reg (const unsigned char *raw_regs, int regnum)
 138 {
 139   if (regnum >= AARCH64_NUM_FT_COLLECT_GREGS)
 140     return 0;
 141
 142   return *(ULONGEST *) (raw_regs
 143                         + aarch64_ft_collect_regmap[regnum] * FT_CR_SIZE);
 144 }
 145
 146 void
 147 initialize_low_tracepoint (void)
 148 {
 149   init_registers_aarch64 ();
 150   ipa_tdesc = tdesc_aarch64;
 151 }