301 lines
10 KiB
C
301 lines
10 KiB
C
/* Target-dependent code for the Xtensa port of GDB, the GNU debugger.
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Copyright (C) 2003, 2005, 2006, 2007 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor,
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Boston, MA 02110-1301, USA. */
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/* XTENSA_TDEP_VERSION can/should be changed along with XTENSA_CONFIG_VERSION
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whenever the "tdep" structure changes in an incompatible way. */
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#define XTENSA_TDEP_VERSION 0x60
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/* Xtensa register type. */
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typedef enum
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{
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xtRegisterTypeArRegfile = 1, /* Register File ar0..arXX. */
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xtRegisterTypeSpecialReg, /* CPU states, such as PS, Booleans, (rsr). */
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xtRegisterTypeUserReg, /* User defined registers (rur). */
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xtRegisterTypeTieRegfile, /* User define register files. */
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xtRegisterTypeTieState, /* TIE States (mapped on user regs). */
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xtRegisterTypeMapped, /* Mapped on Special Registers. */
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xtRegisterTypeUnmapped, /* Special case of masked registers. */
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xtRegisterTypeWindow, /* Live window registers (a0..a15). */
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xtRegisterTypeVirtual, /* PC, FP. */
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xtRegisterTypeUnknown
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} xtensa_register_type_t;
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/* Xtensa register group. */
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typedef enum
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{
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xtRegisterGroupUnknown = 0,
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xtRegisterGroupRegFile = 0x0001, /* Register files without ARx. */
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xtRegisterGroupAddrReg = 0x0002, /* ARx. */
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xtRegisterGroupSpecialReg = 0x0004, /* SRxx. */
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xtRegisterGroupUserReg = 0x0008, /* URxx. */
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xtRegisterGroupState = 0x0010, /* States. */
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xtRegisterGroupGeneral = 0x0100, /* General registers, Ax, SR. */
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xtRegisterGroupUser = 0x0200, /* User registers. */
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xtRegisterGroupFloat = 0x0400, /* Floating Point. */
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xtRegisterGroupVectra = 0x0800, /* Vectra. */
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xtRegisterGroupSystem = 0x1000, /* System. */
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} xtensa_register_group_t;
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/* Xtensa target flags. */
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typedef enum
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{
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xtTargetFlagsNonVisibleRegs = 0x0001,
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xtTargetFlagsUseFetchStore = 0x0002,
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} xtensa_target_flags_t;
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/* Xtensa ELF core file register set representation ('.reg' section).
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Copied from target-side ELF header <xtensa/elf.h>. */
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typedef unsigned long xtensa_elf_greg_t;
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typedef struct
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{
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xtensa_elf_greg_t xchal_config_id0;
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xtensa_elf_greg_t xchal_config_id1;
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xtensa_elf_greg_t cpux;
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xtensa_elf_greg_t cpuy;
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xtensa_elf_greg_t pc;
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xtensa_elf_greg_t ps;
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xtensa_elf_greg_t exccause;
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xtensa_elf_greg_t excvaddr;
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xtensa_elf_greg_t windowbase;
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xtensa_elf_greg_t windowstart;
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xtensa_elf_greg_t lbeg;
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xtensa_elf_greg_t lend;
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xtensa_elf_greg_t lcount;
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xtensa_elf_greg_t sar;
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xtensa_elf_greg_t syscall;
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xtensa_elf_greg_t ar[0]; /* variable size (per config). */
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} xtensa_elf_gregset_t;
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#define SIZEOF_GREGSET (sizeof (xtensa_elf_gregset_t) + NUM_AREGS * 4)
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#define XTENSA_ELF_NGREG (SIZEOF_GREGSET / sizeof(xtensa_elf_greg_t))
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/* Mask. */
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typedef struct
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{
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int reg_num;
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int bit_start;
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int bit_size;
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} xtensa_reg_mask_t;
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typedef struct
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{
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int count;
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xtensa_reg_mask_t *mask;
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} xtensa_mask_t;
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/* Xtensa register representation. */
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typedef struct
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{
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char* name; /* Register name. */
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int offset; /* Offset. */
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xtensa_register_type_t type; /* Register type. */
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xtensa_register_group_t group;/* Register group. */
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struct type* ctype; /* C-type. */
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int bit_size; /* The actual bit size in the target. */
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int byte_size; /* Actual space allocated in registers[]. */
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int align; /* Alignment for this register. */
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unsigned int target_number; /* Register target number. */
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int flags; /* Flags. */
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const xtensa_mask_t *mask; /* Register is a compilation of other regs. */
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const char *fetch; /* Instruction sequence to fetch register. */
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const char *store; /* Instruction sequence to store register. */
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} xtensa_register_t;
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#define XTENSA_REGISTER_FLAGS_PRIVILEDGED 0x0001
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#define XTENSA_REGISTER_FLAGS_READABLE 0x0002
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#define XTENSA_REGISTER_FLAGS_WRITABLE 0x0004
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#define XTENSA_REGISTER_FLAGS_VOLATILE 0x0008
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/* Call-ABI for stack frame. */
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typedef enum
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{
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CallAbiDefault = 0, /* Any 'callX' instructions; default stack. */
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CallAbiCall0Only, /* Only 'call0' instructions; flat stack. */
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} call_abi_t;
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/* Xtensa-specific target dependencies. */
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struct gdbarch_tdep
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{
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unsigned int target_flags;
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/* Spill location for TIE register files under ocd. */
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unsigned int spill_location;
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unsigned int spill_size;
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char *unused; /* Placeholder for compatibility. */
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call_abi_t call_abi; /* Calling convention. */
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/* CPU configuration. */
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unsigned int debug_interrupt_level;
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unsigned int icache_line_bytes;
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unsigned int dcache_line_bytes;
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unsigned int dcache_writeback;
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unsigned int isa_use_windowed_registers;
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unsigned int isa_use_density_instructions;
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unsigned int isa_use_exceptions;
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unsigned int isa_use_ext_l32r;
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unsigned int isa_max_insn_size; /* Maximum instruction length. */
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unsigned int debug_num_ibreaks; /* Number of IBREAKs. */
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unsigned int debug_num_dbreaks;
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/* Register map. */
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xtensa_register_t* regmap;
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unsigned int num_regs; /* Number of registers in regmap. */
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unsigned int num_pseudo_regs; /* Number of pseudo registers. */
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unsigned int num_aregs; /* Size of register file. */
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unsigned int num_contexts;
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int ar_base; /* Register number for AR0. */
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int a0_base; /* Register number for A0 (pseudo). */
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int wb_regnum; /* Register number for WB. */
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int ws_regnum; /* Register number for WS. */
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int pc_regnum; /* Register number for PC. */
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int ps_regnum; /* Register number for PS. */
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int lbeg_regnum; /* Register numbers for count regs. */
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int lend_regnum;
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int lcount_regnum;
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int sar_regnum; /* Register number of SAR. */
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int litbase_regnum; /* Register number of LITBASE. */
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int interrupt_regnum; /* Register number for interrupt. */
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int interrupt2_regnum; /* Register number for interrupt2. */
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int cpenable_regnum; /* Register number for cpenable. */
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int debugcause_regnum; /* Register number for debugcause. */
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int exccause_regnum; /* Register number for exccause. */
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int excvaddr_regnum; /* Register number for excvaddr. */
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int max_register_raw_size;
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int max_register_virtual_size;
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unsigned long *fp_layout; /* Layout of custom/TIE regs in 'FP' area. */
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unsigned int fp_layout_bytes; /* Size of layout information (in bytes). */
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unsigned long *gregmap;
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};
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/* Define macros to access some of the gdbarch entries. */
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#define XTENSA_TARGET_FLAGS \
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(gdbarch_tdep (current_gdbarch)->target_flags)
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#define SPILL_LOCATION \
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(gdbarch_tdep (current_gdbarch)->spill_location)
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#define SPILL_SIZE \
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(gdbarch_tdep (current_gdbarch)->spill_size)
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#define CALL_ABI \
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(gdbarch_tdep (current_gdbarch)->call_abi)
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#define ISA_USE_WINDOWED_REGISTERS \
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(gdbarch_tdep (current_gdbarch)->isa_use_windowed_registers)
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#define ISA_USE_DENSITY_INSTRUCTIONS \
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(gdbarch_tdep (current_gdbarch)->isa_use_density_instructions)
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#define ISA_USE_EXCEPTIONS \
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(gdbarch_tdep (current_gdbarch)->isa_use_exceptions)
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#define ISA_USE_EXT_L32R \
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(gdbarch_tdep (current_gdbarch)->isa_use_ext_l32r)
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#define DEBUG_DATA_VADDR_TRAP_COUNT \
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(gdbarch_tdep (current_gdbarch)->debug_data_vaddr_trap_count)
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#define DEBUG_INST_VADDR_TRAP_COUNT \
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(gdbarch_tdep (current_gdbarch)->debug_inst_vaddr_trap_count)
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#define ISA_MAX_INSN_SIZE \
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(gdbarch_tdep (current_gdbarch)->isa_max_insn_size)
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#define DEBUG_NUM_IBREAKS \
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(gdbarch_tdep (current_gdbarch)->debug_num_ibreaks)
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#define DEBUG_NUM_DBREAKS \
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(gdbarch_tdep (current_gdbarch)->debug_num_dbreaks)
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#define NUM_AREGS (gdbarch_tdep (current_gdbarch)->num_aregs)
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#define WB_REGNUM (gdbarch_tdep (current_gdbarch)->wb_regnum)
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#define WS_REGNUM (gdbarch_tdep (current_gdbarch)->ws_regnum)
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#define LBEG_REGNUM (gdbarch_tdep (current_gdbarch)->lbeg_regnum)
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#define LEND_REGNUM (gdbarch_tdep (current_gdbarch)->lend_regnum)
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#define LCOUNT_REGNUM (gdbarch_tdep (current_gdbarch)->lcount_regnum)
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#define SAR_REGNUM (gdbarch_tdep (current_gdbarch)->sar_regnum)
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#define REGMAP (gdbarch_tdep (current_gdbarch)->regmap)
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#define LITBASE_REGNUM (gdbarch_tdep (current_gdbarch)->litbase_regnum)
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#define DEBUGCAUSE_REGNUM (gdbarch_tdep (current_gdbarch)->debugcause_regnum)
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#define EXCCAUSE_REGNUM (gdbarch_tdep (current_gdbarch)->exccause_regnum)
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#define EXCVADDR_REGNUM (gdbarch_tdep (current_gdbarch)->excvaddr_regnum)
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#define NUM_IBREAKS (gdbarch_tdep (current_gdbarch)->num_ibreaks)
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#define REGMAP_BYTES (gdbarch_tdep (current_gdbarch)->regmap_bytes)
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#define A0_BASE (gdbarch_tdep (current_gdbarch)->a0_base)
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#define AR_BASE (gdbarch_tdep (current_gdbarch)->ar_base)
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#define FP_ALIAS (NUM_REGS + NUM_PSEUDO_REGS)
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#define CALL_ABI (gdbarch_tdep (current_gdbarch)->call_abi)
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#define NUM_CONTEXTS (gdbarch_tdep (current_gdbarch)->num_contexts)
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#define FP_LAYOUT (gdbarch_tdep (current_gdbarch)->fp_layout)
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#define FP_LAYOUT_BYTES (gdbarch_tdep (current_gdbarch)->fp_layout_bytes)
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#define GREGMAP (gdbarch_tdep (current_gdbarch)->gregmap)
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#define AREGS_MASK (NUM_AREGS - 1)
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#define WB_MASK (AREGS_MASK >> 2)
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#define WB_SHIFT 2
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/* We assign fixed numbers to the registers of the "current" window
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(i.e., relative to WB). The registers get remapped via the reg_map
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data structure to their corresponding register in the AR register
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file (see xtensa-tdep.c). */
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#define A0_REGNUM (A0_BASE + 0)
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#define A1_REGNUM (A0_BASE + 1)
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#define A2_REGNUM (A0_BASE + 2)
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#define A3_REGNUM (A0_BASE + 3)
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#define A4_REGNUM (A0_BASE + 4)
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#define A5_REGNUM (A0_BASE + 5)
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#define A6_REGNUM (A0_BASE + 6)
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#define A7_REGNUM (A0_BASE + 7)
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#define A8_REGNUM (A0_BASE + 8)
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#define A9_REGNUM (A0_BASE + 9)
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#define A10_REGNUM (A0_BASE + 10)
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#define A11_REGNUM (A0_BASE + 11)
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#define A12_REGNUM (A0_BASE + 12)
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#define A13_REGNUM (A0_BASE + 13)
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#define A14_REGNUM (A0_BASE + 14)
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#define A15_REGNUM (A0_BASE + 15)
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