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/* Common target dependent code for GDB on ARM systems.
Copyright (C) 1988-2015 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/>. */
#include "common-defs.h"
#include "arm.h"
/* See arm.h. */
int
thumb_insn_size (unsigned short inst1)
{
if ((inst1 & 0xe000) == 0xe000 && (inst1 & 0x1800) != 0)
return 4;
else
return 2;
}
/* See arm.h. */
int
bitcount (unsigned long val)
{
int nbits;
for (nbits = 0; val != 0; nbits++)
val &= val - 1; /* Delete rightmost 1-bit in val. */
return nbits;
}
/* See arm.h. */
int
condition_true (unsigned long cond, unsigned long status_reg)
{
if (cond == INST_AL || cond == INST_NV)
return 1;
switch (cond)
{
case INST_EQ:
return ((status_reg & FLAG_Z) != 0);
case INST_NE:
return ((status_reg & FLAG_Z) == 0);
case INST_CS:
return ((status_reg & FLAG_C) != 0);
case INST_CC:
return ((status_reg & FLAG_C) == 0);
case INST_MI:
return ((status_reg & FLAG_N) != 0);
case INST_PL:
return ((status_reg & FLAG_N) == 0);
case INST_VS:
return ((status_reg & FLAG_V) != 0);
case INST_VC:
return ((status_reg & FLAG_V) == 0);
case INST_HI:
return ((status_reg & (FLAG_C | FLAG_Z)) == FLAG_C);
case INST_LS:
return ((status_reg & (FLAG_C | FLAG_Z)) != FLAG_C);
case INST_GE:
return (((status_reg & FLAG_N) == 0) == ((status_reg & FLAG_V) == 0));
case INST_LT:
return (((status_reg & FLAG_N) == 0) != ((status_reg & FLAG_V) == 0));
case INST_GT:
return (((status_reg & FLAG_Z) == 0)
&& (((status_reg & FLAG_N) == 0)
== ((status_reg & FLAG_V) == 0)));
case INST_LE:
return (((status_reg & FLAG_Z) != 0)
|| (((status_reg & FLAG_N) == 0)
!= ((status_reg & FLAG_V) == 0)));
}
return 1;
}
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