| 1 | /* Native-dependent code for GNU/Linux m32r. |
| 2 | |
| 3 | Copyright (C) 2004-2019 Free Software Foundation, Inc. |
| 4 | |
| 5 | This file is part of GDB. |
| 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, see <http://www.gnu.org/licenses/>. */ |
| 19 | |
| 20 | #include "defs.h" |
| 21 | #include "inferior.h" |
| 22 | #include "gdbcore.h" |
| 23 | #include "regcache.h" |
| 24 | #include "linux-nat.h" |
| 25 | #include "target.h" |
| 26 | #include "nat/gdb_ptrace.h" |
| 27 | #include <sys/user.h> |
| 28 | #include <sys/procfs.h> |
| 29 | #include "inf-ptrace.h" |
| 30 | |
| 31 | /* Prototypes for supply_gregset etc. */ |
| 32 | #include "gregset.h" |
| 33 | |
| 34 | #include "m32r-tdep.h" |
| 35 | \f |
| 36 | |
| 37 | class m32r_linux_nat_target final : public linux_nat_target |
| 38 | { |
| 39 | public: |
| 40 | /* Add our register access methods. */ |
| 41 | void fetch_registers (struct regcache *, int) override; |
| 42 | void store_registers (struct regcache *, int) override; |
| 43 | }; |
| 44 | |
| 45 | static m32r_linux_nat_target the_m32r_linux_nat_target; |
| 46 | |
| 47 | /* Since EVB register is not available for native debug, we reduce |
| 48 | the number of registers. */ |
| 49 | #define M32R_LINUX_NUM_REGS (M32R_NUM_REGS - 1) |
| 50 | |
| 51 | /* Mapping between the general-purpose registers in `struct user' |
| 52 | format and GDB's register array layout. */ |
| 53 | static int regmap[] = { |
| 54 | 4, 5, 6, 7, 0, 1, 2, 8, |
| 55 | 9, 10, 11, 12, 13, 24, 25, 23, |
| 56 | 19, 19, 26, 23, 22, 20, 16, 15 |
| 57 | }; |
| 58 | |
| 59 | #define PSW_REGMAP 19 |
| 60 | #define BBPSW_REGMAP 21 |
| 61 | #define SPU_REGMAP 23 |
| 62 | #define SPI_REGMAP 26 |
| 63 | |
| 64 | /* Doee (??) apply to the corresponding SET requests as well. */ |
| 65 | #define GETREGS_SUPPLIES(regno) (0 <= (regno) \ |
| 66 | && (regno) <= M32R_LINUX_NUM_REGS) |
| 67 | \f |
| 68 | |
| 69 | |
| 70 | /* Transfering the general-purpose registers between GDB, inferiors |
| 71 | and core files. */ |
| 72 | |
| 73 | /* Fill GDB's register array with the general-purpose register values |
| 74 | in *GREGSETP. */ |
| 75 | |
| 76 | void |
| 77 | supply_gregset (struct regcache *regcache, const elf_gregset_t * gregsetp) |
| 78 | { |
| 79 | const elf_greg_t *regp = (const elf_greg_t *) gregsetp; |
| 80 | int i; |
| 81 | unsigned long psw, bbpsw; |
| 82 | |
| 83 | psw = *(regp + PSW_REGMAP); |
| 84 | bbpsw = *(regp + BBPSW_REGMAP); |
| 85 | |
| 86 | for (i = 0; i < M32R_LINUX_NUM_REGS; i++) |
| 87 | { |
| 88 | elf_greg_t regval; |
| 89 | |
| 90 | switch (i) |
| 91 | { |
| 92 | case PSW_REGNUM: |
| 93 | regval = ((0x00c1 & bbpsw) << 8) | ((0xc100 & psw) >> 8); |
| 94 | break; |
| 95 | case CBR_REGNUM: |
| 96 | regval = ((psw >> 8) & 1); |
| 97 | break; |
| 98 | default: |
| 99 | regval = *(regp + regmap[i]); |
| 100 | break; |
| 101 | } |
| 102 | |
| 103 | if (i != M32R_SP_REGNUM) |
| 104 | regcache->raw_supply (i, ®val); |
| 105 | else if (psw & 0x8000) |
| 106 | regcache->raw_supply (i, regp + SPU_REGMAP); |
| 107 | else |
| 108 | regcache->raw_supply (i, regp + SPI_REGMAP); |
| 109 | } |
| 110 | } |
| 111 | |
| 112 | /* Fetch all general-purpose registers from process/thread TID and |
| 113 | store their values in GDB's register array. */ |
| 114 | |
| 115 | static void |
| 116 | fetch_regs (struct regcache *regcache, int tid) |
| 117 | { |
| 118 | elf_gregset_t regs; |
| 119 | |
| 120 | if (ptrace (PTRACE_GETREGS, tid, 0, (int) ®s) < 0) |
| 121 | perror_with_name (_("Couldn't get registers")); |
| 122 | |
| 123 | supply_gregset (regcache, (const elf_gregset_t *) ®s); |
| 124 | } |
| 125 | |
| 126 | /* Fill register REGNO (if it is a general-purpose register) in |
| 127 | *GREGSETPS with the value in GDB's register array. If REGNO is -1, |
| 128 | do this for all registers. */ |
| 129 | |
| 130 | void |
| 131 | fill_gregset (const struct regcache *regcache, |
| 132 | elf_gregset_t * gregsetp, int regno) |
| 133 | { |
| 134 | elf_greg_t *regp = (elf_greg_t *) gregsetp; |
| 135 | int i; |
| 136 | unsigned long psw, bbpsw, tmp; |
| 137 | |
| 138 | psw = *(regp + PSW_REGMAP); |
| 139 | bbpsw = *(regp + BBPSW_REGMAP); |
| 140 | |
| 141 | for (i = 0; i < M32R_LINUX_NUM_REGS; i++) |
| 142 | { |
| 143 | if (regno != -1 && regno != i) |
| 144 | continue; |
| 145 | |
| 146 | if (i == CBR_REGNUM || i == PSW_REGNUM) |
| 147 | continue; |
| 148 | |
| 149 | if (i == SPU_REGNUM || i == SPI_REGNUM) |
| 150 | continue; |
| 151 | |
| 152 | if (i != M32R_SP_REGNUM) |
| 153 | regcache->raw_collect (i, regp + regmap[i]); |
| 154 | else if (psw & 0x8000) |
| 155 | regcache->raw_collect (i, regp + SPU_REGMAP); |
| 156 | else |
| 157 | regcache->raw_collect (i, regp + SPI_REGMAP); |
| 158 | } |
| 159 | } |
| 160 | |
| 161 | /* Store all valid general-purpose registers in GDB's register array |
| 162 | into the process/thread specified by TID. */ |
| 163 | |
| 164 | static void |
| 165 | store_regs (const struct regcache *regcache, int tid, int regno) |
| 166 | { |
| 167 | elf_gregset_t regs; |
| 168 | |
| 169 | if (ptrace (PTRACE_GETREGS, tid, 0, (int) ®s) < 0) |
| 170 | perror_with_name (_("Couldn't get registers")); |
| 171 | |
| 172 | fill_gregset (regcache, ®s, regno); |
| 173 | |
| 174 | if (ptrace (PTRACE_SETREGS, tid, 0, (int) ®s) < 0) |
| 175 | perror_with_name (_("Couldn't write registers")); |
| 176 | } |
| 177 | \f |
| 178 | |
| 179 | |
| 180 | /* Transfering floating-point registers between GDB, inferiors and cores. |
| 181 | Since M32R has no floating-point registers, these functions do nothing. */ |
| 182 | |
| 183 | void |
| 184 | supply_fpregset (struct regcache *regcache, const gdb_fpregset_t *fpregs) |
| 185 | { |
| 186 | } |
| 187 | |
| 188 | void |
| 189 | fill_fpregset (const struct regcache *regcache, |
| 190 | gdb_fpregset_t *fpregs, int regno) |
| 191 | { |
| 192 | } |
| 193 | \f |
| 194 | |
| 195 | |
| 196 | /* Transferring arbitrary registers between GDB and inferior. */ |
| 197 | |
| 198 | /* Fetch register REGNO from the child process. If REGNO is -1, do |
| 199 | this for all registers (including the floating point and SSE |
| 200 | registers). */ |
| 201 | |
| 202 | void |
| 203 | m32r_linux_nat_target::fetch_registers (struct regcache *regcache, int regno) |
| 204 | { |
| 205 | pid_t tid = get_ptrace_pid (regcache->ptid ()); |
| 206 | |
| 207 | /* Use the PTRACE_GETREGS request whenever possible, since it |
| 208 | transfers more registers in one system call, and we'll cache the |
| 209 | results. */ |
| 210 | if (regno == -1 || GETREGS_SUPPLIES (regno)) |
| 211 | { |
| 212 | fetch_regs (regcache, tid); |
| 213 | return; |
| 214 | } |
| 215 | |
| 216 | internal_error (__FILE__, __LINE__, |
| 217 | _("Got request for bad register number %d."), regno); |
| 218 | } |
| 219 | |
| 220 | /* Store register REGNO back into the child process. If REGNO is -1, |
| 221 | do this for all registers (including the floating point and SSE |
| 222 | registers). */ |
| 223 | void |
| 224 | m32r_linux_nat_target::store_registers (struct regcache *regcache, int regno) |
| 225 | { |
| 226 | pid_t tid = get_ptrace_pid (regcache->ptid ()); |
| 227 | |
| 228 | /* Use the PTRACE_SETREGS request whenever possible, since it |
| 229 | transfers more registers in one system call. */ |
| 230 | if (regno == -1 || GETREGS_SUPPLIES (regno)) |
| 231 | { |
| 232 | store_regs (regcache, tid, regno); |
| 233 | return; |
| 234 | } |
| 235 | |
| 236 | internal_error (__FILE__, __LINE__, |
| 237 | _("Got request to store bad register number %d."), regno); |
| 238 | } |
| 239 | |
| 240 | void |
| 241 | _initialize_m32r_linux_nat (void) |
| 242 | { |
| 243 | /* Register the target. */ |
| 244 | linux_target = &the_m32r_linux_nat_target; |
| 245 | add_inf_child_target (&the_m32r_linux_nat_target); |
| 246 | } |