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binutils-gdb/gdb/arch/arm.h
Simon Marchi 5f661e0397 gnulib: import count-one-bits module and use it 
For a fix I intend to submit, I would need a function that counts the
number of set bits in a word.  There is  __builtin_popcount that is
supported by gcc and clang, but there is also a gnulib module that wraps
that and provides a fallback for other compilers, so I think it would be
good to use it.

I also noticed that there is a bitcount function in arch/arm.c, so I
thought that as a first step I would replace that one with the gnulib
count-one-bits module.  This is what this patch does.

The gnulib module provides multiple functions, with various parameter
length (unsigned int, unsigned long int, unsigned long long int), I
chose the one that made sense for each call site based on the argument
type.

gnulib/ChangeLog:

	* update-gnulib.sh (IMPORTED_GNULIB_MODULES): Import
	count-one-bits module.
	* configure: Re-generate.
	* aclocal.m4: Re-generate.
	* Makefile.in: Re-generate.
	* import/count-one-bits.c: New file.
	* import/count-one-bits.h: New file.
	* import/Makefile.am: Re-generate.
	* import/Makefile.in: Re-generate.
	* import/m4/gnulib-cache.m4: Re-generate.
	* import/m4/gnulib-comp.m4: Re-generate.
	* import/m4/count-one-bits.m4: New file.

gdb/ChangeLog:

	* arm-tdep.c: Include count-one-bits.h.
	(cleanup_block_store_pc): Use count_one_bits.
	(cleanup_block_load_pc): Use count_one_bits.
	(arm_copy_block_xfer): Use count_one_bits.
	(thumb2_copy_block_xfer): Use count_one_bits.
	(thumb_copy_pop_pc_16bit): Use count_one_bits.
	* arch/arm-get-next-pcs.c: Include count-one-bits.h.
	(thumb_get_next_pcs_raw): Use count_one_bits.
	(arm_get_next_pcs_raw): Use count_one_bits_l.
	* arch/arm.c (bitcount): Remove.
	* arch/arm.h (bitcount): Remove.
2020-02-14 14:41:07 -05:00

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/* Common target dependent code for GDB on ARM systems.
Copyright (C) 1988-2020 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 ARCH_ARM_H
#define ARCH_ARM_H
#include "gdbsupport/tdesc.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 */
/* F0..F7 are the fp registers for the (obsolete) FPA architecture. */
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,
};
/* Supported Arm FP hardware types. */
enum arm_fp_type {
ARM_FP_TYPE_NONE = 0,
ARM_FP_TYPE_VFPV2,
ARM_FP_TYPE_VFPV3,
ARM_FP_TYPE_IWMMXT,
ARM_FP_TYPE_INVALID
};
/* Supported M-profile Arm types. */
enum arm_m_profile_type {
ARM_M_TYPE_M_PROFILE,
ARM_M_TYPE_VFP_D16,
ARM_M_TYPE_WITH_FPA,
ARM_M_TYPE_INVALID
};
/* 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 registers. */
#define ARM_INT_REGISTER_SIZE 4
/* IEEE extended doubles are 80 bits. DWORD aligned they use 96 bits. */
#define ARM_FP_REGISTER_SIZE 12
#define ARM_VFP_REGISTER_SIZE 8
#define IWMMXT_VEC_REGISTER_SIZE 8
/* Size of register sets. */
/* r0-r12,sp,lr,pc,cpsr. */
#define ARM_CORE_REGS_SIZE (17 * ARM_INT_REGISTER_SIZE)
/* f0-f8,fps. */
#define ARM_FP_REGS_SIZE (8 * ARM_FP_REGISTER_SIZE + ARM_INT_REGISTER_SIZE)
/* d0-d15,fpscr. */
#define ARM_VFP2_REGS_SIZE (16 * ARM_VFP_REGISTER_SIZE + ARM_INT_REGISTER_SIZE)
/* d0-d31,fpscr. */
#define ARM_VFP3_REGS_SIZE (32 * ARM_VFP_REGISTER_SIZE + ARM_INT_REGISTER_SIZE)
/* wR0-wR15,fpscr. */
#define IWMMXT_REGS_SIZE (16 * IWMMXT_VEC_REGISTER_SIZE \
+ 6 * ARM_INT_REGISTER_SIZE)
/* 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 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);
/* Create an Arm target description with the given FP hardware type. */
target_desc *arm_create_target_description (arm_fp_type fp_type);
/* Create an Arm M-profile target description with the given hardware type. */
target_desc *arm_create_mprofile_target_description (arm_m_profile_type m_type);
#endif /* ARCH_ARM_H */
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