2006-11-14 Maxim Grigoriev <maxim@tensilica.com>

	* NEWS: New port to Xtensa.
	* Makefile.in: Add dependencies for Xtensa files.
	* configure.tgt (xtensa*, xtensa*-*-elf*): New.
	* configure.host (xtensa*-*-elf*): New.
	* config/xtensa/xtensa.mt: New file.
	* xtensa-config.c: New file.
	* xtensa-tdep.h: New file.
	* xtensa-tdep.c: New file.

2006-11-14  Maxim Grigoriev  <maxim@tensilica.com>

	* gdb.texinfo (Contributors): Add contributors of Xtensa port.

1 files changed, 298 insertions, 0 deletions

diff --git a/gdb/xtensa-tdep.h b/gdb/xtensa-tdep.h
new file mode 100644
index 0000000..3d5390c
--- /dev/null
+++ b/gdb/xtensa-tdep.h
@@ -0,0 +1,298 @@
+/* Target-dependent code for the Xtensa port of GDB, the GNU debugger.
+
+   Copyright (C) 2003, 2005, 2006 Free Software Foundation, Inc.
+
+   This file is part of GDB.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 51 Franklin Street, Fifth Floor,
+   Boston, MA 02110-1301, USA.  */
+
+
+/* XTENSA_TDEP_VERSION can/should be changed along with XTENSA_CONFIG_VERSION
+   whenever the "tdep" structure changes in an incompatible way.  */
+
+#define XTENSA_TDEP_VERSION 0x60
+
+/*  Xtensa register type.  */
+
+typedef enum 
+{
+  xtRegisterTypeArRegfile = 1,	/* Register File ar0..arXX.  */
+  xtRegisterTypeSpecialReg,	/* CPU states, such as PS, Booleans, (rsr).  */
+  xtRegisterTypeUserReg,	/* User defined registers (rur).  */
+  xtRegisterTypeTieRegfile,	/* User define register files.  */
+  xtRegisterTypeTieState,	/* TIE States (mapped on user regs).  */
+  xtRegisterTypeMapped,		/* Mapped on Special Registers.  */
+  xtRegisterTypeUnmapped,	/* Special case of masked registers.  */
+  xtRegisterTypeWindow,		/* Live window registers (a0..a15).  */
+  xtRegisterTypeVirtual,	/* PC, FP.  */
+  xtRegisterTypeUnknown
+} xtensa_register_type_t;
+
+
+/*  Xtensa register group.  */
+
+typedef enum 
+{
+  xtRegisterGroupUnknown = 0,
+  xtRegisterGroupRegFile	= 0x0001,    /* Register files without ARx.  */
+  xtRegisterGroupAddrReg	= 0x0002,    /* ARx.  */
+  xtRegisterGroupSpecialReg	= 0x0004,    /* SRxx.  */
+  xtRegisterGroupUserReg	= 0x0008,    /* URxx.  */
+  xtRegisterGroupState 		= 0x0010,    /* States.  */
+
+  xtRegisterGroupGeneral	= 0x0100,    /* General registers, Ax, SR.  */
+  xtRegisterGroupUser		= 0x0200,    /* User registers.  */
+  xtRegisterGroupFloat		= 0x0400,    /* Floating Point.  */
+  xtRegisterGroupVectra		= 0x0800,    /* Vectra.  */
+  xtRegisterGroupSystem		= 0x1000,    /* System.  */
+} xtensa_register_group_t;
+
+
+/*  Xtensa target flags.  */
+
+typedef enum 
+{
+  xtTargetFlagsNonVisibleRegs	= 0x0001,
+  xtTargetFlagsUseFetchStore	= 0x0002,
+} xtensa_target_flags_t;
+
+
+/* Xtensa ELF core file register set representation ('.reg' section). 
+   Copied from target-side ELF header <xtensa/elf.h>.  */
+
+typedef unsigned long xtensa_elf_greg_t;
+
+typedef struct
+{
+  xtensa_elf_greg_t xchal_config_id0;
+  xtensa_elf_greg_t xchal_config_id1;
+  xtensa_elf_greg_t cpux;
+  xtensa_elf_greg_t cpuy;
+  xtensa_elf_greg_t pc;
+  xtensa_elf_greg_t ps;
+  xtensa_elf_greg_t exccause;
+  xtensa_elf_greg_t excvaddr;
+  xtensa_elf_greg_t windowbase;
+  xtensa_elf_greg_t windowstart;
+  xtensa_elf_greg_t lbeg;
+  xtensa_elf_greg_t lend;
+  xtensa_elf_greg_t lcount;
+  xtensa_elf_greg_t sar;
+  xtensa_elf_greg_t syscall;
+  xtensa_elf_greg_t ar[0];	/* variable size (per config).  */
+} xtensa_elf_gregset_t;
+
+#define SIZEOF_GREGSET (sizeof (xtensa_elf_gregset_t) + NUM_AREGS * 4)
+#define XTENSA_ELF_NGREG (SIZEOF_GREGSET / sizeof(xtensa_elf_greg_t))
+
+
+/*  Mask.  */
+
+typedef struct 
+{
+  int count;
+  struct 
+  {
+    int reg_num;
+    int bit_start;
+    int bit_size;
+  } mask[0];
+} xtensa_mask_t;
+
+
+/*  Xtensa register representation.  */
+
+typedef struct 
+{
+  char* name;             	/* Register name.  */
+  int offset;             	/* Offset.  */
+  xtensa_register_type_t type;  /* Register type.  */
+  xtensa_register_group_t group;/* Register group.  */
+  struct type* ctype;		/* C-type.  */
+  int bit_size;  		/* The actual bit size in the target.  */
+  int byte_size;          	/* Actual space allocated in registers[].  */
+  int align;			/* Alignment for this register.  */
+
+  unsigned int target_number;	/* Register target number.  */
+
+  int flags;			/* Flags.  */
+
+  const xtensa_mask_t *mask;	/* Register is a compilation of other regs.  */
+  const char *fetch;		/* Instruction sequence to fetch register.  */
+  const char *store;		/* Instruction sequence to store register.  */
+} xtensa_register_t;
+
+
+#define XTENSA_REGISTER_FLAGS_PRIVILEDGED	0x0001
+#define XTENSA_REGISTER_FLAGS_READABLE		0x0002
+#define XTENSA_REGISTER_FLAGS_WRITABLE		0x0004
+#define XTENSA_REGISTER_FLAGS_VOLATILE		0x0008
+
+
+/*  Call-ABI for stack frame.  */
+
+typedef enum 
+{
+  CallAbiDefault = 0,		/* Any 'callX' instructions; default stack.  */
+  CallAbiCall0Only,		/* Only 'call0' instructions; flat stack.  */
+} call_abi_t;
+
+
+/*  Xtensa-specific target dependencies.  */
+
+struct gdbarch_tdep
+{
+  unsigned int target_flags;
+
+  /* Spill location for TIE register files under ocd.  */
+
+  unsigned int spill_location;
+  unsigned int spill_size;
+
+  char *unused;				/* Placeholder for compatibility.  */
+  call_abi_t call_abi;			/* Calling convention.  */
+
+  /* CPU configuration.  */
+
+  unsigned int debug_interrupt_level;
+
+  unsigned int icache_line_bytes;
+  unsigned int dcache_line_bytes;
+  unsigned int dcache_writeback;
+
+  unsigned int isa_use_windowed_registers;
+  unsigned int isa_use_density_instructions;
+  unsigned int isa_use_exceptions;
+  unsigned int isa_use_ext_l32r;
+  unsigned int isa_max_insn_size;	/* Maximum instruction length.  */
+  unsigned int debug_num_ibreaks;	/* Number of IBREAKs.  */
+  unsigned int debug_num_dbreaks;
+
+  /* Register map.  */
+
+  xtensa_register_t* regmap;
+
+  unsigned int num_regs;	/* Number of registers in regmap.  */
+  unsigned int num_pseudo_regs;	/* Number of pseudo registers.  */
+  unsigned int num_aregs;	/* Size of register file.  */
+  unsigned int num_contexts;
+
+  int ar_base;			/* Register number for AR0.  */
+  int a0_base;			/* Register number for A0 (pseudo).  */
+  int wb_regnum;		/* Register number for WB.  */
+  int ws_regnum;		/* Register number for WS.  */
+  int pc_regnum;		/* Register number for PC.  */
+  int ps_regnum;		/* Register number for PS.  */
+  int lbeg_regnum;		/* Register numbers for count regs.  */
+  int lend_regnum;
+  int lcount_regnum;
+  int sar_regnum;		/* Register number of SAR.  */
+  int litbase_regnum;		/* Register number of LITBASE.  */
+
+  int interrupt_regnum;		/* Register number for interrupt.  */
+  int interrupt2_regnum;	/* Register number for interrupt2.  */
+  int cpenable_regnum;		/* Register number for cpenable.  */
+  int debugcause_regnum;	/* Register number for debugcause.  */
+  int exccause_regnum;		/* Register number for exccause.  */
+  int excvaddr_regnum;		/* Register number for excvaddr.  */
+
+  int max_register_raw_size;
+  int max_register_virtual_size;
+  unsigned long *fp_layout;	/* Layout of custom/TIE regs in 'FP' area.  */
+  unsigned int fp_layout_bytes;	/* Size of layout information (in bytes).  */
+  unsigned long *gregmap;
+};
+
+
+/* Define macros to access some of the gdbarch entries.  */
+#define XTENSA_TARGET_FLAGS \
+  (gdbarch_tdep (current_gdbarch)->target_flags)
+#define SPILL_LOCATION \
+  (gdbarch_tdep (current_gdbarch)->spill_location)
+#define SPILL_SIZE \
+  (gdbarch_tdep (current_gdbarch)->spill_size)
+#define CALL_ABI		\
+  (gdbarch_tdep (current_gdbarch)->call_abi)
+#define ISA_USE_WINDOWED_REGISTERS \
+  (gdbarch_tdep (current_gdbarch)->isa_use_windowed_registers)
+#define ISA_USE_DENSITY_INSTRUCTIONS \
+  (gdbarch_tdep (current_gdbarch)->isa_use_density_instructions)
+#define ISA_USE_EXCEPTIONS \
+  (gdbarch_tdep (current_gdbarch)->isa_use_exceptions)
+#define ISA_USE_EXT_L32R \
+  (gdbarch_tdep (current_gdbarch)->isa_use_ext_l32r)
+#define DEBUG_DATA_VADDR_TRAP_COUNT \
+  (gdbarch_tdep (current_gdbarch)->debug_data_vaddr_trap_count)
+#define DEBUG_INST_VADDR_TRAP_COUNT \
+  (gdbarch_tdep (current_gdbarch)->debug_inst_vaddr_trap_count)
+#define ISA_MAX_INSN_SIZE \
+  (gdbarch_tdep (current_gdbarch)->isa_max_insn_size)
+#define DEBUG_NUM_IBREAKS \
+  (gdbarch_tdep (current_gdbarch)->debug_num_ibreaks)
+#define DEBUG_NUM_DBREAKS \
+  (gdbarch_tdep (current_gdbarch)->debug_num_dbreaks)
+
+#define NUM_AREGS         (gdbarch_tdep (current_gdbarch)->num_aregs)
+#define WB_REGNUM         (gdbarch_tdep (current_gdbarch)->wb_regnum)
+#define WS_REGNUM         (gdbarch_tdep (current_gdbarch)->ws_regnum)
+#define LBEG_REGNUM       (gdbarch_tdep (current_gdbarch)->lbeg_regnum)
+#define LEND_REGNUM       (gdbarch_tdep (current_gdbarch)->lend_regnum)
+#define LCOUNT_REGNUM     (gdbarch_tdep (current_gdbarch)->lcount_regnum)
+#define SAR_REGNUM        (gdbarch_tdep (current_gdbarch)->sar_regnum)
+#define REGMAP            (gdbarch_tdep (current_gdbarch)->regmap)
+
+#define LITBASE_REGNUM    (gdbarch_tdep (current_gdbarch)->litbase_regnum)
+#define DEBUGCAUSE_REGNUM (gdbarch_tdep (current_gdbarch)->debugcause_regnum)
+#define EXCCAUSE_REGNUM   (gdbarch_tdep (current_gdbarch)->exccause_regnum)
+#define EXCVADDR_REGNUM   (gdbarch_tdep (current_gdbarch)->excvaddr_regnum)
+#define NUM_IBREAKS       (gdbarch_tdep (current_gdbarch)->num_ibreaks)
+#define REGMAP_BYTES      (gdbarch_tdep (current_gdbarch)->regmap_bytes)
+#define A0_BASE           (gdbarch_tdep (current_gdbarch)->a0_base)
+#define AR_BASE           (gdbarch_tdep (current_gdbarch)->ar_base)
+#define FP_ALIAS	  (NUM_REGS + NUM_PSEUDO_REGS)
+#define CALL_ABI          (gdbarch_tdep (current_gdbarch)->call_abi)
+#define NUM_CONTEXTS      (gdbarch_tdep (current_gdbarch)->num_contexts)
+  
+#define FP_LAYOUT         (gdbarch_tdep (current_gdbarch)->fp_layout)
+#define FP_LAYOUT_BYTES   (gdbarch_tdep (current_gdbarch)->fp_layout_bytes)
+#define GREGMAP           (gdbarch_tdep (current_gdbarch)->gregmap)
+
+#define AREGS_MASK	  (NUM_AREGS - 1)
+#define WB_MASK		  (AREGS_MASK >> 2)
+#define WB_SHIFT	  2
+
+/* We assign fixed numbers to the registers of the "current" window 
+   (i.e., relative to WB).  The registers get remapped via the reg_map 
+   data structure to their corresponding register in the AR register 
+   file (see xtensa-tdep.c).  */
+
+#define A0_REGNUM  (A0_BASE + 0)
+#define A1_REGNUM  (A0_BASE + 1)
+#define A2_REGNUM  (A0_BASE + 2)
+#define A3_REGNUM  (A0_BASE + 3)
+#define A4_REGNUM  (A0_BASE + 4)
+#define A5_REGNUM  (A0_BASE + 5)
+#define A6_REGNUM  (A0_BASE + 6)
+#define A7_REGNUM  (A0_BASE + 7)
+#define A8_REGNUM  (A0_BASE + 8)
+#define A9_REGNUM  (A0_BASE + 9)
+#define A10_REGNUM (A0_BASE + 10)
+#define A11_REGNUM (A0_BASE + 11)
+#define A12_REGNUM (A0_BASE + 12)
+#define A13_REGNUM (A0_BASE + 13)
+#define A14_REGNUM (A0_BASE + 14)
+#define A15_REGNUM (A0_BASE + 15)
+