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(arm_get_fp_model): Declare. * arm-tdep.c (fp_model_strings): New string array. (arm_fp_model, current_fp_model): New variables. (arm_get_fp_model): New function. (arm_set_fp): New function. (set_fp_model_sfunc): New function. (show_fp_model): New function. (_initialize_arm_tdep): Add new command to set/show the FPU. (arm_extract_return_value): Use arm_get_fp_model. (arm_store_return_value): Likewise. (arm_gdbarch_init): Default fpa model is softfpa. Call arm_set_fp to initialize the floating-point data types. * arm-linux-tdep.c (arm_linux_init_abi): The default floating point model is FPA.
161 lines
6.0 KiB
C
161 lines
6.0 KiB
C
/* Common target dependent code for GDB on ARM systems.
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Copyright 2002, 2003 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., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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/* Register numbers of various important registers. Note that some of
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these values are "real" register numbers, and correspond to the
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general registers of the machine, and some are "phony" register
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numbers which are too large to be actual register numbers as far as
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the user is concerned but do serve to get the desired values when
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passed to read_register. */
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enum gdb_regnum {
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ARM_A1_REGNUM = 0, /* first integer-like argument */
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ARM_A4_REGNUM = 3, /* last integer-like argument */
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ARM_AP_REGNUM = 11,
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ARM_SP_REGNUM = 13, /* Contains address of top of stack */
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ARM_LR_REGNUM = 14, /* address to return to from a function call */
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ARM_PC_REGNUM = 15, /* Contains program counter */
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ARM_F0_REGNUM = 16, /* first floating point register */
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ARM_F3_REGNUM = 19, /* last floating point argument register */
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ARM_F7_REGNUM = 23, /* last floating point register */
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ARM_FPS_REGNUM = 24, /* floating point status register */
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ARM_PS_REGNUM = 25, /* Contains processor status */
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ARM_FP_REGNUM = 11, /* Frame register in ARM code, if used. */
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THUMB_FP_REGNUM = 7, /* Frame register in Thumb code, if used. */
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ARM_NUM_ARG_REGS = 4,
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ARM_LAST_ARG_REGNUM = ARM_A4_REGNUM,
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ARM_NUM_FP_ARG_REGS = 4,
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ARM_LAST_FP_ARG_REGNUM = ARM_F3_REGNUM
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};
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/* Used in target-specific code when we need to know the size of the
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largest type of register we need to handle. */
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#define ARM_MAX_REGISTER_RAW_SIZE 12
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#define ARM_MAX_REGISTER_VIRTUAL_SIZE 8
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/* Size of integer registers. */
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#define INT_REGISTER_RAW_SIZE 4
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#define INT_REGISTER_VIRTUAL_SIZE 4
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/* Say how long FP registers are. Used for documentation purposes and
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code readability in this header. IEEE extended doubles are 80
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bits. DWORD aligned they use 96 bits. */
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#define FP_REGISTER_RAW_SIZE 12
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/* GCC doesn't support long doubles (extended IEEE values). The FP
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register virtual size is therefore 64 bits. Used for documentation
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purposes and code readability in this header. */
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#define FP_REGISTER_VIRTUAL_SIZE 8
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/* Status registers are the same size as general purpose registers.
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Used for documentation purposes and code readability in this
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header. */
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#define STATUS_REGISTER_SIZE 4
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/* Number of machine registers. The only define actually required
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is NUM_REGS. The other definitions are used for documentation
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purposes and code readability. */
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/* For 26 bit ARM code, a fake copy of the PC is placed in register 25 (PS)
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(and called PS for processor status) so the status bits can be cleared
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from the PC (register 15). For 32 bit ARM code, a copy of CPSR is placed
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in PS. */
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#define NUM_FREGS 8 /* Number of floating point registers. */
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#define NUM_SREGS 2 /* Number of status registers. */
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#define NUM_GREGS 16 /* Number of general purpose registers. */
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/* Instruction condition field values. */
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#define INST_EQ 0x0
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#define INST_NE 0x1
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#define INST_CS 0x2
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#define INST_CC 0x3
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#define INST_MI 0x4
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#define INST_PL 0x5
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#define INST_VS 0x6
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#define INST_VC 0x7
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#define INST_HI 0x8
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#define INST_LS 0x9
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#define INST_GE 0xa
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#define INST_LT 0xb
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#define INST_GT 0xc
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#define INST_LE 0xd
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#define INST_AL 0xe
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#define INST_NV 0xf
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#define FLAG_N 0x80000000
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#define FLAG_Z 0x40000000
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#define FLAG_C 0x20000000
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#define FLAG_V 0x10000000
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/* Type of floating-point code in use by inferior. There are really 3 models
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that are traditionally supported (plus the endianness issue), but gcc can
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only generate 2 of those. The third is APCS_FLOAT, where arguments to
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functions are passed in floating-point registers.
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In addition to the traditional models, VFP adds two more.
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If you update this enum, don't forget to update fp_model_strings in
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arm-tdep.c. */
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enum arm_float_model
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{
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ARM_FLOAT_AUTO, /* Automatic detection. Do not set in tdep. */
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ARM_FLOAT_SOFT_FPA, /* Traditional soft-float (mixed-endian on LE ARM). */
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ARM_FLOAT_FPA, /* FPA co-processor. GCC calling convention. */
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ARM_FLOAT_SOFT_VFP, /* Soft-float with pure-endian doubles. */
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ARM_FLOAT_VFP, /* Full VFP calling convention. */
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ARM_FLOAT_LAST /* Keep at end. */
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};
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/* A method to the setting based on user's choice and ABI setting. */
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enum arm_float_model arm_get_fp_model (struct gdbarch *);
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/* Target-dependent structure in gdbarch. */
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struct gdbarch_tdep
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{
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enum arm_float_model fp_model; /* Floating point calling conventions. */
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CORE_ADDR lowest_pc; /* Lowest address at which instructions
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will appear. */
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const char *arm_breakpoint; /* Breakpoint pattern for an ARM insn. */
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int arm_breakpoint_size; /* And its size. */
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const char *thumb_breakpoint; /* Breakpoint pattern for an ARM insn. */
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int thumb_breakpoint_size; /* And its size. */
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int jb_pc; /* Offset to PC value in jump buffer.
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If this is negative, longjmp support
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will be disabled. */
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size_t jb_elt_size; /* And the size of each entry in the buf. */
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};
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#ifndef LOWEST_PC
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#define LOWEST_PC (gdbarch_tdep (current_gdbarch)->lowest_pc)
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#endif
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/* Prototypes for internal interfaces needed by more than one MD file. */
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int arm_pc_is_thumb_dummy (CORE_ADDR);
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int arm_pc_is_thumb (CORE_ADDR);
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CORE_ADDR thumb_get_next_pc (CORE_ADDR);
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CORE_ADDR arm_get_next_pc (CORE_ADDR);
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