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- /*Copyright (C) 2015-2022 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 "gdbsupport/common-defs.h"
- #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)
- {
- 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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