cdf436294f
This patch is to teach both GDB and GDBServer to detect 64-bit inferior correctly. We find a problem that GDBServer is unable to detect on a e5500 core processor. Current GDBServer assumes that MSR is a 64-bit register, but MSR is a 32-bit register in Book III-E. This patch is to fix this problem by checking the right bit in MSR, in order to handle both Book III-S and Book III-E. In order to detect Book III-S and Book III-E, we check the PPC_FEATURE_BOOKE from the host's HWCAP (by getauxval on glibc >= 2.16. If getauxval doesn't exist, we implement the fallback by parsing /proc/self/auxv), because it should an invariant on the same machine cross different processes. In order to share code, I add nat/ppc-linux.c for both GDB and GDBserver side. gdb: 2015-01-14 Yao Qi <yao@codesourcery.com> * Makefile.in (ppc-linux.o): New rule. * config/powerpc/ppc64-linux.mh (NATDEPFILES): Add ppc-linux.o. * configure.ac: AC_CHECK_FUNCS(getauxval). * config.in: Re-generated. * configure: Re-generated. * nat/ppc-linux.h [__powerpc64__] (ppc64_64bit_inferior_p): Declare. * nat/ppc-linux.c: New file. * ppc-linux-nat.c (ppc_linux_target_wordsize) [__powerpc64__]: Call ppc64_64bit_inferior_p. gdb/gdbserver: 2015-01-14 Yao Qi <yao@codesourcery.com> * Makefile.in (SFILES): Add nat/ppc-linux.c. (ppc-linux.o): New rule. * configure.srv (powerpc*-*-linux*): Add ppc-linux.o. * configure.ac: AC_CHECK_FUNCS(getauxval). * config.in: Re-generated. * configure: Re-generated. * linux-ppc-low.c (ppc_arch_setup) [__powerpc64__]: Call ppc64_64bit_inferior_p
75 lines
1.9 KiB
C
75 lines
1.9 KiB
C
/*Copyright (C) 2015 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include "common-defs.h"
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#include "ppc-linux.h"
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#include <elf.h>
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#ifdef HAVE_GETAUXVAL
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#include <sys/auxv.h>
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#endif
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#ifdef __powerpc64__
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/* Get the HWCAP from the process of GDB or GDBserver. If success,
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save it in *VALP. */
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static void
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ppc64_host_hwcap (unsigned long *valp)
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{
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#ifdef HAVE_GETAUXVAL
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*valp = getauxval (AT_HWCAP);
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#else
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unsigned long data[2];
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FILE *f = fopen ("/proc/self/auxv", "r");
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if (f == NULL)
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return;
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while (fread (data, sizeof (data), 1, f) > 0)
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{
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if (data[0] == AT_HWCAP)
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{
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*valp = data[1];
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break;
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}
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}
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fclose (f);
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#endif /* HAVE_GETAUXVAL */
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}
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int
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ppc64_64bit_inferior_p (long msr)
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{
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unsigned long ppc_host_hwcap = 0;
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/* Get host's HWCAP to check whether the machine is Book E. */
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ppc64_host_hwcap (&ppc_host_hwcap);
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/* We actually have a 64-bit inferior only if the certain bit of the
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MSR is set. The PowerISA Book III-S MSR is different from the
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PowerISA Book III-E MSR. The Book III-S MSR is 64 bits wide, and
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its MSR[SF] is the bit 0 of a 64-bit value. Book III-E MSR is 32
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bits wide, and its MSR[CM] is the bit 0 of a 32-bit value. */
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if (ppc_host_hwcap & PPC_FEATURE_BOOKE)
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return msr & 0x80000000;
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else
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return msr < 0;
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}
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#endif
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