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/* Common target dependent code for GDB on ARM systems.
Copyright (C) 1988-2018 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 3 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, see <http://www.gnu.org/licenses/>. */
#ifndef ARM_H
#define ARM_H
/* Register numbers of various important registers. */
enum gdb_regnum {
ARM_A1_REGNUM = 0, /* first integer-like argument */
ARM_A4_REGNUM = 3, /* last integer-like argument */
ARM_AP_REGNUM = 11,
ARM_IP_REGNUM = 12,
ARM_SP_REGNUM = 13, /* Contains address of top of stack */
ARM_LR_REGNUM = 14, /* address to return to from a function call */
ARM_PC_REGNUM = 15, /* Contains program counter */
ARM_F0_REGNUM = 16, /* first floating point register */
ARM_F3_REGNUM = 19, /* last floating point argument register */
ARM_F7_REGNUM = 23, /* last floating point register */
ARM_FPS_REGNUM = 24, /* floating point status register */
ARM_PS_REGNUM = 25, /* Contains processor status */
ARM_WR0_REGNUM, /* WMMX data registers. */
ARM_WR15_REGNUM = ARM_WR0_REGNUM + 15,
ARM_WC0_REGNUM, /* WMMX control registers. */
ARM_WCSSF_REGNUM = ARM_WC0_REGNUM + 2,
ARM_WCASF_REGNUM = ARM_WC0_REGNUM + 3,
ARM_WC7_REGNUM = ARM_WC0_REGNUM + 7,
ARM_WCGR0_REGNUM, /* WMMX general purpose registers. */
ARM_WCGR3_REGNUM = ARM_WCGR0_REGNUM + 3,
ARM_WCGR7_REGNUM = ARM_WCGR0_REGNUM + 7,
ARM_D0_REGNUM, /* VFP double-precision registers. */
ARM_D31_REGNUM = ARM_D0_REGNUM + 31,
ARM_FPSCR_REGNUM,
ARM_NUM_REGS,
/* Other useful registers. */
ARM_FP_REGNUM = 11, /* Frame register in ARM code, if used. */
THUMB_FP_REGNUM = 7, /* Frame register in Thumb code, if used. */
ARM_NUM_ARG_REGS = 4,
ARM_LAST_ARG_REGNUM = ARM_A4_REGNUM,
ARM_NUM_FP_ARG_REGS = 4,
ARM_LAST_FP_ARG_REGNUM = ARM_F3_REGNUM
};
/* Enum describing the different kinds of breakpoints. */
enum arm_breakpoint_kinds
{
ARM_BP_KIND_THUMB = 2,
ARM_BP_KIND_THUMB2 = 3,
ARM_BP_KIND_ARM = 4,
};
/* Instruction condition field values. */
#define INST_EQ 0x0
#define INST_NE 0x1
#define INST_CS 0x2
#define INST_CC 0x3
#define INST_MI 0x4
#define INST_PL 0x5
#define INST_VS 0x6
#define INST_VC 0x7
#define INST_HI 0x8
#define INST_LS 0x9
#define INST_GE 0xa
#define INST_LT 0xb
#define INST_GT 0xc
#define INST_LE 0xd
#define INST_AL 0xe
#define INST_NV 0xf
#define FLAG_N 0x80000000
#define FLAG_Z 0x40000000
#define FLAG_C 0x20000000
#define FLAG_V 0x10000000
#define CPSR_T 0x20
#define XPSR_T 0x01000000
/* Size of integer registers. */
#define INT_REGISTER_SIZE 4
/* Addresses for calling Thumb functions have the bit 0 set.
Here are some macros to test, set, or clear bit 0 of addresses. */
#define IS_THUMB_ADDR(addr) ((addr) & 1)
#define MAKE_THUMB_ADDR(addr) ((addr) | 1)
#define UNMAKE_THUMB_ADDR(addr) ((addr) & ~1)
/* Support routines for instruction parsing. */
#define submask(x) ((1L << ((x) + 1)) - 1)
#define bits(obj,st,fn) (((obj) >> (st)) & submask ((fn) - (st)))
#define bit(obj,st) (((obj) >> (st)) & 1)
#define sbits(obj,st,fn) \
((long) (bits(obj,st,fn) | ((long) bit(obj,fn) * ~ submask (fn - st))))
#define BranchDest(addr,instr) \
((CORE_ADDR) (((unsigned long) (addr)) + 8 + (sbits (instr, 0, 23) << 2)))
/* Forward declaration. */
struct regcache;
/* Return the size in bytes of the complete Thumb instruction whose
first halfword is INST1. */
int thumb_insn_size (unsigned short inst1);
/* Returns true if the condition evaluates to true. */
int condition_true (unsigned long cond, unsigned long status_reg);
/* Return number of 1-bits in VAL. */
int bitcount (unsigned long val);
/* Return 1 if THIS_INSTR might change control flow, 0 otherwise. */
int arm_instruction_changes_pc (uint32_t this_instr);
/* Return 1 if the 16-bit Thumb instruction INST might change
control flow, 0 otherwise. */
int thumb_instruction_changes_pc (unsigned short inst);
/* Return 1 if the 32-bit Thumb instruction in INST1 and INST2
might change control flow, 0 otherwise. */
int thumb2_instruction_changes_pc (unsigned short inst1, unsigned short inst2);
/* Advance the state of the IT block and return that state. */
int thumb_advance_itstate (unsigned int itstate);
/* Decode shifted register value. */
unsigned long shifted_reg_val (struct regcache *regcache,
unsigned long inst,
int carry,
unsigned long pc_val,
unsigned long status_reg);
#endif
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