607685ecee
This patch is to let aarch64 GDB debug 32-bit arm program natively. In each function for fetching and storing registers, GDB will check gdbarch_bfd_arch_info (gdbarch)->bits_per_word, if it is 32, call the corresponding aarch32 functions in aarch32-linux-nat.c, otherwise fall back to aarch64 code to fetch and store registers. aarch64_linux_read_description has to return the right target description, but we don't have gdbarch available there, so GDB fetches auxv and gets AT_PHENT, in order to determine whether the target is 32-bit or 64-bit. I learned this trick from solib-svr4.c. gdb: 2015-07-07 Yao Qi <yao.qi@linaro.org> * aarch32-linux-nat.h (VFP_REGS_SIZE): New macro, moved from arm-linux-nat.c. * aarch64-linux-nat.c: Include aarch32-linux-nat.h and elf/external.h. (fetch_gregs_from_thread): Call aarch32_gp_regcache_supply if target is 32-bit. (store_gregs_to_thread): Call aarch32_gp_regcache_collect if target is 32-bit. (fetch_fpregs_from_thread): Call aarch32_vfp_regcache_supply if target is 32-bit. (store_fpregs_to_thread): Call aarch32_vfp_regcache_collect if target is 32-bit. (tdesc_arm_with_vfpv3, tdesc_arm_with_neon): Declare. (aarch64_linux_read_description): Return the right target description. * arm-linux-nat.c (VFP_REGS_SIZE): Moved to aarch32-linux-nat.h. * config/aarch64/linux.mh (NATDEPFILES): Add aarch32-linux-nat.o. * configure.tgt (aarch64*-*-linux*): Add arm-tdep.o and arm-linux-tdep.o
28 lines
1.1 KiB
Text
28 lines
1.1 KiB
Text
# Host: AArch64 based machine running GNU/Linux
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#
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# Copyright (C) 2013-2015 Free Software Foundation, Inc.
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# Contributed by ARM Ltd.
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#
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# This file is part of GDB.
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#
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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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#
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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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#
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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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NAT_FILE= config/nm-linux.h
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NATDEPFILES= inf-ptrace.o fork-child.o aarch64-linux-nat.o aarch32-linux-nat.o \
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proc-service.o linux-thread-db.o linux-nat.o linux-fork.o \
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linux-procfs.o linux-ptrace.o linux-osdata.o linux-waitpid.o \
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linux-personality.o linux-namespaces.o
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NAT_CDEPS = $(srcdir)/proc-service.list
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LOADLIBES= -ldl $(RDYNAMIC)
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