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0ec848ad25
Currently the ppc linux core file target doesn't return target descriptions with the lager FPSCR introduced in isa205. This patch changes the core file target so that the auxv is read from the core file to determine the size of FPSCR, so that the appropriate target description is selected. gdb/ChangeLog: 2018-05-22 Pedro Franco de Carvalho <pedromfc@linux.vnet.ibm.com> * arch/ppc-linux-common.c (ppc_linux_has_isa205): Change the parameter type to CORE_ADDR. * arch/ppc-linux-common.h (ppc_linux_has_isa205): Change the parameter type in declaration to CORE_ADDR. * ppc-linux-tdep.c (ppc_linux_core_read_description): Call target_auxv_search to get AT_HWCAP and use the result to get the target description. * ppc-linux-nat.c (ppc_linux_get_hwcap): Change the return type to CORE_ADDR. Remove the cast of the return value to unsigned long. Fix error predicate of target_auxv_search. (ppc_linux_nat_target::read_description): Change the type of the hwcap variable to CORE_ADDR. gdb/testsuite/ChangeLog: 2018-05-22 Pedro Franco de Carvalho <pedromfc@linux.vnet.ibm.com> * gdb.arch/powerpc-fpscr-gcore.exp: New file.
86 lines
2.7 KiB
C
86 lines
2.7 KiB
C
/* Common target dependent code for GNU/Linux on PPC systems.
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Copyright (C) 2018 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 "arch/ppc-linux-common.h"
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#include "arch/ppc-linux-tdesc.h"
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/* Decimal Floating Point bit in AT_HWCAP.
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This file can be used by a host with another architecture, e.g.
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when debugging core files, which might not provide this constant. */
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#ifndef PPC_FEATURE_HAS_DFP
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#define PPC_FEATURE_HAS_DFP 0x00000400
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#endif
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bool
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ppc_linux_has_isa205 (CORE_ADDR hwcap)
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{
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/* Power ISA 2.05 (implemented by Power 6 and newer processors)
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increases the FPSCR from 32 bits to 64 bits. Even though Power 7
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supports this ISA version, it doesn't have PPC_FEATURE_ARCH_2_05
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set, only PPC_FEATURE_ARCH_2_06. Since for now the only bits
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used in the higher half of the register are for Decimal Floating
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Point, we check if that feature is available to decide the size
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of the FPSCR. */
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return ((hwcap & PPC_FEATURE_HAS_DFP) != 0);
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}
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const struct target_desc *
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ppc_linux_match_description (struct ppc_linux_features features)
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{
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struct target_desc *tdesc = NULL;
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if (features.wordsize == 8)
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{
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if (features.cell)
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tdesc = tdesc_powerpc_cell64l;
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else if (features.vsx)
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tdesc = features.isa205
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? tdesc_powerpc_isa205_vsx64l : tdesc_powerpc_vsx64l;
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else if (features.altivec)
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tdesc = features.isa205
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? tdesc_powerpc_isa205_altivec64l : tdesc_powerpc_altivec64l;
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else
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tdesc = features.isa205?
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tdesc_powerpc_isa205_64l : tdesc_powerpc_64l;
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}
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else
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{
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gdb_assert (features.wordsize == 4);
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if (features.cell)
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tdesc = tdesc_powerpc_cell32l;
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else if (features.vsx)
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tdesc = features.isa205
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? tdesc_powerpc_isa205_vsx32l : tdesc_powerpc_vsx32l;
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else if (features.altivec)
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tdesc = features.isa205
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? tdesc_powerpc_isa205_altivec32l : tdesc_powerpc_altivec32l;
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else
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tdesc = features.isa205
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? tdesc_powerpc_isa205_32l : tdesc_powerpc_32l;
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}
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gdb_assert (tdesc != NULL);
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return tdesc;
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}
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