293 lines
9.5 KiB
C
293 lines
9.5 KiB
C
/* Target-dependent code for the Xtensa port of GDB, the GNU debugger.
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Copyright (C) 2003-2016 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 3 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, see <http://www.gnu.org/licenses/>. */
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#include "arch/xtensa.h"
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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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#define XTENSA_MAX_COPROCESSOR 0x10 /* Number of Xtensa coprocessors. */
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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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xtRegisterGroupNCP = 0x00800000, /* Non-CP non-base opt/custom. */
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xtRegisterGroupCP0 = 0x01000000, /* CP0. */
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xtRegisterGroupCP1 = 0x02000000, /* CP1. */
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xtRegisterGroupCP2 = 0x04000000, /* CP2. */
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xtRegisterGroupCP3 = 0x08000000, /* CP3. */
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xtRegisterGroupCP4 = 0x10000000, /* CP4. */
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xtRegisterGroupCP5 = 0x20000000, /* CP5. */
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xtRegisterGroupCP6 = 0x40000000, /* CP6. */
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xtRegisterGroupCP7 = 0x80000000, /* CP7. */
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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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/* 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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int coprocessor; /* Coprocessor num, -1 for non-CP, else -2. */
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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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/* For xtensa-config.c to expand to the structure above. */
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#define XTREG(index,ofs,bsz,sz,al,tnum,flg,cp,ty,gr,name,fet,sto,mas,ct,x,y) \
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{#name, ofs, (xtensa_register_type_t) (ty), \
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((xtensa_register_group_t) \
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((gr) | ((xtRegisterGroupNCP >> 2) << (cp + 2)))), \
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ct, bsz, sz, al, tnum, flg, cp, mas, fet, sto},
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#define XTREG_END \
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{0, 0, (xtensa_register_type_t) 0, (xtensa_register_group_t) 0, \
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0, 0, 0, 0, -1, 0, 0, 0, 0, 0},
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#define XTENSA_REGISTER_FLAGS_PRIVILEGED 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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struct ctype_cache
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{
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struct ctype_cache *next;
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int size;
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struct type *virtual_type;
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};
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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 register map. */
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unsigned int num_nopriv_regs; /* Number of non-privileged registers. */
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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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/* Cached register types. */
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struct ctype_cache *type_entries;
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};
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/* Macro to instantiate a gdbarch_tdep structure. */
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#define XTENSA_GDBARCH_TDEP_INSTANTIATE(rmap,spillsz) \
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{ \
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.target_flags = 0, \
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.spill_location = -1, \
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.spill_size = (spillsz), \
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.unused = 0, \
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.call_abi = (XSHAL_ABI == XTHAL_ABI_CALL0 \
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? CallAbiCall0Only \
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: CallAbiDefault), \
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.debug_interrupt_level = XCHAL_DEBUGLEVEL, \
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.icache_line_bytes = XCHAL_ICACHE_LINESIZE, \
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.dcache_line_bytes = XCHAL_DCACHE_LINESIZE, \
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.dcache_writeback = XCHAL_DCACHE_IS_WRITEBACK, \
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.isa_use_windowed_registers = (XSHAL_ABI != XTHAL_ABI_CALL0), \
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.isa_use_density_instructions = XCHAL_HAVE_DENSITY, \
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.isa_use_exceptions = XCHAL_HAVE_EXCEPTIONS, \
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.isa_use_ext_l32r = XSHAL_USE_ABSOLUTE_LITERALS, \
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.isa_max_insn_size = XCHAL_MAX_INSTRUCTION_SIZE, \
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.debug_num_ibreaks = XCHAL_NUM_IBREAK, \
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.debug_num_dbreaks = XCHAL_NUM_DBREAK, \
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.regmap = rmap, \
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.num_regs = 0, \
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.num_nopriv_regs = 0, \
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.num_pseudo_regs = 0, \
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.num_aregs = XCHAL_NUM_AREGS, \
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.num_contexts = XCHAL_NUM_CONTEXTS, \
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.ar_base = -1, \
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.a0_base = -1, \
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.wb_regnum = -1, \
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.ws_regnum = -1, \
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.pc_regnum = -1, \
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.ps_regnum = -1, \
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.lbeg_regnum = -1, \
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.lend_regnum = -1, \
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.lcount_regnum = -1, \
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.sar_regnum = -1, \
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.litbase_regnum = -1, \
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.interrupt_regnum = -1, \
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.interrupt2_regnum = -1, \
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.cpenable_regnum = -1, \
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.debugcause_regnum = -1, \
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.exccause_regnum = -1, \
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.excvaddr_regnum = -1, \
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.max_register_raw_size = 0, \
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.max_register_virtual_size = 0, \
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.fp_layout = 0, \
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.fp_layout_bytes = 0, \
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.gregmap = 0, \
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}
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#define XTENSA_CONFIG_INSTANTIATE(rmap,spill_size) \
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struct gdbarch_tdep xtensa_tdep = \
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XTENSA_GDBARCH_TDEP_INSTANTIATE(rmap,spill_size);
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#ifndef XCHAL_NUM_CONTEXTS
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#define XCHAL_NUM_CONTEXTS 0
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#endif
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#ifndef XCHAL_HAVE_EXCEPTIONS
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#define XCHAL_HAVE_EXCEPTIONS 1
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#endif
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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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