| 1 | /* Ravenscar SPARC target support. |
| 2 | |
| 3 | Copyright (C) 2004-2018 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 "gdbcore.h" |
| 22 | #include "regcache.h" |
| 23 | #include "sparc-tdep.h" |
| 24 | #include "inferior.h" |
| 25 | #include "ravenscar-thread.h" |
| 26 | #include "sparc-ravenscar-thread.h" |
| 27 | |
| 28 | static void sparc_ravenscar_fetch_registers (struct regcache *regcache, |
| 29 | int regnum); |
| 30 | static void sparc_ravenscar_store_registers (struct regcache *regcache, |
| 31 | int regnum); |
| 32 | static void sparc_ravenscar_prepare_to_store (struct regcache *regcache); |
| 33 | |
| 34 | /* Register offsets from a referenced address (exempli gratia the |
| 35 | Thread_Descriptor). The referenced address depends on the register |
| 36 | number. The Thread_Descriptor layout and the stack layout are documented |
| 37 | in the GNAT sources, in sparc-bb.h. */ |
| 38 | |
| 39 | static const int sparc_register_offsets[] = |
| 40 | { |
| 41 | /* G0 - G7 */ |
| 42 | -1, 0x24, 0x28, 0x2C, 0x30, 0x34, 0x38, 0x3C, |
| 43 | /* O0 - O7 */ |
| 44 | 0x00, 0x04, 0x08, 0x0C, 0x10, 0x14, 0x18, 0x1C, |
| 45 | /* L0 - L7 */ |
| 46 | 0x00, 0x04, 0x08, 0x0C, 0x10, 0x14, 0x18, 0x1C, |
| 47 | /* I0 - I7 */ |
| 48 | 0x20, 0x24, 0x28, 0x2C, 0x30, 0x34, 0x38, 0x3C, |
| 49 | /* F0 - F31 */ |
| 50 | 0x50, 0x54, 0x58, 0x5C, 0x60, 0x64, 0x68, 0x6C, |
| 51 | 0x70, 0x74, 0x78, 0x7C, 0x80, 0x84, 0x88, 0x8C, |
| 52 | 0x90, 0x94, 0x99, 0x9C, 0xA0, 0xA4, 0xA8, 0xAC, |
| 53 | 0xB0, 0xB4, 0xBB, 0xBC, 0xC0, 0xC4, 0xC8, 0xCC, |
| 54 | /* Y PSR WIM TBR PC NPC FPSR CPSR */ |
| 55 | 0x40, 0x20, 0x44, -1, 0x1C, -1, 0x4C, -1 |
| 56 | }; |
| 57 | |
| 58 | /* supply register REGNUM, which has been saved on REGISTER_ADDR, to the |
| 59 | regcache. */ |
| 60 | |
| 61 | static void |
| 62 | supply_register_at_address (struct regcache *regcache, int regnum, |
| 63 | CORE_ADDR register_addr) |
| 64 | { |
| 65 | struct gdbarch *gdbarch = regcache->arch (); |
| 66 | int buf_size = register_size (gdbarch, regnum); |
| 67 | gdb_byte *buf; |
| 68 | |
| 69 | buf = (gdb_byte *) alloca (buf_size); |
| 70 | read_memory (register_addr, buf, buf_size); |
| 71 | regcache_raw_supply (regcache, regnum, buf); |
| 72 | } |
| 73 | |
| 74 | /* Return true if, for a non-running thread, REGNUM has been saved on the |
| 75 | stack. */ |
| 76 | |
| 77 | static int |
| 78 | register_on_stack_p (int regnum) |
| 79 | { |
| 80 | return (regnum >= SPARC_L0_REGNUM && regnum <= SPARC_L7_REGNUM) |
| 81 | || (regnum >= SPARC_I0_REGNUM && regnum <= SPARC_I7_REGNUM); |
| 82 | } |
| 83 | |
| 84 | /* Return true if, for a non-running thread, REGNUM has been saved on the |
| 85 | Thread_Descriptor. */ |
| 86 | |
| 87 | static int |
| 88 | register_in_thread_descriptor_p (int regnum) |
| 89 | { |
| 90 | return (regnum >= SPARC_O0_REGNUM && regnum <= SPARC_O7_REGNUM) |
| 91 | || (regnum == SPARC32_PSR_REGNUM) |
| 92 | || (regnum >= SPARC_G1_REGNUM && regnum <= SPARC_G7_REGNUM) |
| 93 | || (regnum == SPARC32_Y_REGNUM) |
| 94 | || (regnum == SPARC32_WIM_REGNUM) |
| 95 | || (regnum == SPARC32_FSR_REGNUM) |
| 96 | || (regnum >= SPARC_F0_REGNUM && regnum <= SPARC_F0_REGNUM + 31) |
| 97 | || (regnum == SPARC32_PC_REGNUM); |
| 98 | } |
| 99 | |
| 100 | /* to_fetch_registers when inferior_ptid is different from the running |
| 101 | thread. */ |
| 102 | |
| 103 | static void |
| 104 | sparc_ravenscar_fetch_registers (struct regcache *regcache, int regnum) |
| 105 | { |
| 106 | struct gdbarch *gdbarch = regcache->arch (); |
| 107 | const int sp_regnum = gdbarch_sp_regnum (gdbarch); |
| 108 | const int num_regs = gdbarch_num_regs (gdbarch); |
| 109 | int current_regnum; |
| 110 | CORE_ADDR current_address; |
| 111 | CORE_ADDR thread_descriptor_address; |
| 112 | ULONGEST stack_address; |
| 113 | |
| 114 | /* The tid is the thread_id field, which is a pointer to the thread. */ |
| 115 | thread_descriptor_address = (CORE_ADDR) ptid_get_tid (inferior_ptid); |
| 116 | |
| 117 | /* Read the saved SP in the context buffer. */ |
| 118 | current_address = thread_descriptor_address |
| 119 | + sparc_register_offsets [sp_regnum]; |
| 120 | supply_register_at_address (regcache, sp_regnum, current_address); |
| 121 | regcache_cooked_read_unsigned (regcache, sp_regnum, &stack_address); |
| 122 | |
| 123 | /* Read registers. */ |
| 124 | for (current_regnum = 0; current_regnum < num_regs; current_regnum ++) |
| 125 | { |
| 126 | if (register_in_thread_descriptor_p (current_regnum)) |
| 127 | { |
| 128 | current_address = thread_descriptor_address |
| 129 | + sparc_register_offsets [current_regnum]; |
| 130 | supply_register_at_address (regcache, current_regnum, |
| 131 | current_address); |
| 132 | } |
| 133 | else if (register_on_stack_p (current_regnum)) |
| 134 | { |
| 135 | current_address = stack_address |
| 136 | + sparc_register_offsets [current_regnum]; |
| 137 | supply_register_at_address (regcache, current_regnum, |
| 138 | current_address); |
| 139 | } |
| 140 | } |
| 141 | } |
| 142 | |
| 143 | /* to_prepare_to_store when inferior_ptid is different from the running |
| 144 | thread. */ |
| 145 | |
| 146 | static void |
| 147 | sparc_ravenscar_prepare_to_store (struct regcache *regcache) |
| 148 | { |
| 149 | /* Nothing to do. */ |
| 150 | } |
| 151 | |
| 152 | /* to_store_registers when inferior_ptid is different from the running |
| 153 | thread. */ |
| 154 | |
| 155 | static void |
| 156 | sparc_ravenscar_store_registers (struct regcache *regcache, int regnum) |
| 157 | { |
| 158 | struct gdbarch *gdbarch = regcache->arch (); |
| 159 | int buf_size = register_size (gdbarch, regnum); |
| 160 | gdb_byte buf[buf_size]; |
| 161 | ULONGEST register_address; |
| 162 | |
| 163 | if (register_in_thread_descriptor_p (regnum)) |
| 164 | register_address = |
| 165 | ptid_get_tid (inferior_ptid) + sparc_register_offsets [regnum]; |
| 166 | else if (register_on_stack_p (regnum)) |
| 167 | { |
| 168 | regcache_cooked_read_unsigned (regcache, SPARC_SP_REGNUM, |
| 169 | ®ister_address); |
| 170 | register_address += sparc_register_offsets [regnum]; |
| 171 | } |
| 172 | else |
| 173 | return; |
| 174 | |
| 175 | regcache_raw_collect (regcache, regnum, buf); |
| 176 | write_memory (register_address, |
| 177 | buf, |
| 178 | buf_size); |
| 179 | } |
| 180 | |
| 181 | static struct ravenscar_arch_ops sparc_ravenscar_ops = |
| 182 | { |
| 183 | sparc_ravenscar_fetch_registers, |
| 184 | sparc_ravenscar_store_registers, |
| 185 | sparc_ravenscar_prepare_to_store |
| 186 | }; |
| 187 | |
| 188 | /* Register ravenscar_arch_ops in GDBARCH. */ |
| 189 | |
| 190 | void |
| 191 | register_sparc_ravenscar_ops (struct gdbarch *gdbarch) |
| 192 | { |
| 193 | set_gdbarch_ravenscar_ops (gdbarch, &sparc_ravenscar_ops); |
| 194 | } |