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/*Copyright (C) 2015-2024 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 "ppc-linux.h"
#include "nat/gdb_ptrace.h"
#include <elf.h>
#ifdef HAVE_GETAUXVAL
#include <sys/auxv.h>
#endif
#ifdef __powerpc64__
/* Get the HWCAP from the process of GDB or GDBserver. If success,
save it in *VALP. */
static void
ppc64_host_hwcap (unsigned long *valp)
{
#ifdef HAVE_GETAUXVAL
*valp = getauxval (AT_HWCAP);
#else
unsigned long data[2];
FILE *f = fopen ("/proc/self/auxv", "r");
if (f == NULL)
return;
while (fread (data, sizeof (data), 1, f) > 0)
{
if (data[0] == AT_HWCAP)
{
*valp = data[1];
break;
}
}
fclose (f);
#endif /* HAVE_GETAUXVAL */
}
static inline int
ppc64_64bit_inferior_p (long msr)
{
unsigned long ppc_host_hwcap = 0;
/* Get host's HWCAP to check whether the machine is Book E. */
ppc64_host_hwcap (&ppc_host_hwcap);
/* We actually have a 64-bit inferior only if the certain bit of the
MSR is set. The PowerISA Book III-S MSR is different from the
PowerISA Book III-E MSR. The Book III-S MSR is 64 bits wide, and
its MSR[SF] is the bit 0 of a 64-bit value. Book III-E MSR is 32
bits wide, and its MSR[CM] is the bit 0 of a 32-bit value. */
if (ppc_host_hwcap & PPC_FEATURE_BOOKE)
return msr & 0x80000000;
else
return msr < 0;
}
#endif
int
ppc_linux_target_wordsize (int tid)
{
gdb_assert (tid != 0);
int wordsize = 4;
/* Check for 64-bit inferior process. This is the case when the host is
64-bit, and in addition the top bit of the MSR register is set. */
#ifdef __powerpc64__
long msr;
errno = 0;
msr = (long) ptrace (PTRACE_PEEKUSER, tid, PT_MSR * 8, 0);
if (errno == 0 && ppc64_64bit_inferior_p (msr))
wordsize = 8;
#endif
return wordsize;
}
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