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150 lines
4.9 KiB
C
150 lines
4.9 KiB
C
/* Common target dependent code for GDB on ARM systems.
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Copyright (C) 1988-2018 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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#ifndef ARM_H
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#define ARM_H
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/* Register numbers of various important registers. */
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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_IP_REGNUM = 12,
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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_WR0_REGNUM, /* WMMX data registers. */
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ARM_WR15_REGNUM = ARM_WR0_REGNUM + 15,
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ARM_WC0_REGNUM, /* WMMX control registers. */
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ARM_WCSSF_REGNUM = ARM_WC0_REGNUM + 2,
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ARM_WCASF_REGNUM = ARM_WC0_REGNUM + 3,
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ARM_WC7_REGNUM = ARM_WC0_REGNUM + 7,
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ARM_WCGR0_REGNUM, /* WMMX general purpose registers. */
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ARM_WCGR3_REGNUM = ARM_WCGR0_REGNUM + 3,
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ARM_WCGR7_REGNUM = ARM_WCGR0_REGNUM + 7,
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ARM_D0_REGNUM, /* VFP double-precision registers. */
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ARM_D31_REGNUM = ARM_D0_REGNUM + 31,
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ARM_FPSCR_REGNUM,
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ARM_NUM_REGS,
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/* Other useful registers. */
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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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/* Enum describing the different kinds of breakpoints. */
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enum arm_breakpoint_kinds
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{
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ARM_BP_KIND_THUMB = 2,
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ARM_BP_KIND_THUMB2 = 3,
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ARM_BP_KIND_ARM = 4,
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};
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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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#define CPSR_T 0x20
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#define XPSR_T 0x01000000
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/* Size of integer registers. */
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#define INT_REGISTER_SIZE 4
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/* Addresses for calling Thumb functions have the bit 0 set.
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Here are some macros to test, set, or clear bit 0 of addresses. */
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#define IS_THUMB_ADDR(addr) ((addr) & 1)
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#define MAKE_THUMB_ADDR(addr) ((addr) | 1)
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#define UNMAKE_THUMB_ADDR(addr) ((addr) & ~1)
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/* Support routines for instruction parsing. */
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#define submask(x) ((1L << ((x) + 1)) - 1)
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#define bits(obj,st,fn) (((obj) >> (st)) & submask ((fn) - (st)))
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#define bit(obj,st) (((obj) >> (st)) & 1)
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#define sbits(obj,st,fn) \
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((long) (bits(obj,st,fn) | ((long) bit(obj,fn) * ~ submask (fn - st))))
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#define BranchDest(addr,instr) \
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((CORE_ADDR) (((unsigned long) (addr)) + 8 + (sbits (instr, 0, 23) << 2)))
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/* Forward declaration. */
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struct regcache;
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/* Return the size in bytes of the complete Thumb instruction whose
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first halfword is INST1. */
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int thumb_insn_size (unsigned short inst1);
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/* Returns true if the condition evaluates to true. */
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int condition_true (unsigned long cond, unsigned long status_reg);
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/* Return number of 1-bits in VAL. */
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int bitcount (unsigned long val);
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/* Return 1 if THIS_INSTR might change control flow, 0 otherwise. */
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int arm_instruction_changes_pc (uint32_t this_instr);
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/* Return 1 if the 16-bit Thumb instruction INST might change
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control flow, 0 otherwise. */
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int thumb_instruction_changes_pc (unsigned short inst);
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/* Return 1 if the 32-bit Thumb instruction in INST1 and INST2
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might change control flow, 0 otherwise. */
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int thumb2_instruction_changes_pc (unsigned short inst1, unsigned short inst2);
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/* Advance the state of the IT block and return that state. */
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int thumb_advance_itstate (unsigned int itstate);
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/* Decode shifted register value. */
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unsigned long shifted_reg_val (struct regcache *regcache,
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unsigned long inst,
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int carry,
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unsigned long pc_val,
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unsigned long status_reg);
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#endif
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