mirror of
https://sourceware.org/git/binutils-gdb.git
synced 2025-01-06 12:09:26 +08:00
757e686afb
Simon Marchi tried gdb on OpenBSD, and it immediately segfaults when
running a program. Simon tracked down the problem to x86_dr_low.get_status
being nullptr at this point:
(lldb) print x86_dr_low.get_status
(unsigned long (*)()) $0 = 0x0000000000000000
(lldb) bt
* thread #1, stop reason = step over
* frame #0: 0x0000033b64b764aa gdb`x86_dr_stopped_data_address(state=0x0000033d7162a310, addr_p=0x00007f7ffffc5688) at x86-dregs.c:645:12
frame #1: 0x0000033b64b766de gdb`x86_dr_stopped_by_watchpoint(state=0x0000033d7162a310) at x86-dregs.c:687:10
frame #2: 0x0000033b64ea5f72 gdb`x86_stopped_by_watchpoint() at x86-nat.c:206:10
frame #3: 0x0000033b64637fbb gdb`x86_nat_target<obsd_nat_target>::stopped_by_watchpoint(this=0x0000033b65252820) at x86-nat.h💯12
frame #4: 0x0000033b64d3ff11 gdb`target_stopped_by_watchpoint() at target.c:468:46
frame #5: 0x0000033b6469b001 gdb`watchpoints_triggered(ws=0x00007f7ffffc61c8) at breakpoint.c:4790:32
frame #6: 0x0000033b64a8bb8b gdb`handle_signal_stop(ecs=0x00007f7ffffc61a0) at infrun.c:6072:29
frame #7: 0x0000033b64a7e3a7 gdb`handle_inferior_event(ecs=0x00007f7ffffc61a0) at infrun.c:5694:7
frame #8: 0x0000033b64a7c1a0 gdb`fetch_inferior_event() at infrun.c:4090:5
frame #9: 0x0000033b64a51921 gdb`inferior_event_handler(event_type=INF_REG_EVENT) at inf-loop.c:41:7
frame #10: 0x0000033b64a827c9 gdb`infrun_async_inferior_event_handler(data=0x0000000000000000) at infrun.c:9384:3
frame #11: 0x0000033b6465bd4f gdb`check_async_event_handlers() at async-event.c:335:4
frame #12: 0x0000033b65070917 gdb`gdb_do_one_event() at event-loop.cc:216:10
frame #13: 0x0000033b64af0db1 gdb`start_event_loop() at main.c:421:13
frame #14: 0x0000033b64aefe9a gdb`captured_command_loop() at main.c:481:3
frame #15: 0x0000033b64aed5c2 gdb`captured_main(data=0x00007f7ffffc6470) at main.c:1353:4
frame #16: 0x0000033b64aed4f2 gdb`gdb_main(args=0x00007f7ffffc6470) at main.c:1368:7
frame #17: 0x0000033b6459d787 gdb`main(argc=5, argv=0x00007f7ffffc6518) at gdb.c:32:10
frame #18: 0x0000033b6459d521 gdb`___start + 321
On BSDs, get_status is set in _initialize_x86_bsd_nat, but only if
HAVE_PT_GETDBREGS is defined. PT_GETDBREGS doesn't exist on OpenBSD, so
get_status (and the other fields of x86_dr_low) are left as nullptr.
OpenBSD doesn't support getting or setting the x86 debug registers, so
fix by omitting debug register support entirely on OpenBSD:
- Change x86bsd_nat_target to only inherit from x86_nat_target if
PT_GETDBREGS is supported.
- Don't include x86-nat.o and nat/x86-dregs.o for OpenBSD/amd64. They
were already omitted for OpenBSD/i386.
494 lines
12 KiB
Bash
494 lines
12 KiB
Bash
# ; -*- mode: sh ; -*-
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# Copyright (C) 2013-2021 Free Software Foundation, Inc.
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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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# Variables defined here:
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#
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# NAT_FILE - The header file with definitions for this native target.
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#
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# NATDEPFILES - Source files required for native debugging on this
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# native target.
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#
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# NAT_CDEPS - Dynamic symbols to be exported for libthread_db.
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#
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# LOADLIBES - Libraries against which GDB will be linked for this
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# native target.
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#
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# MH_CFLAGS - Additional CFLAGS for this host.
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#
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# XM_CLIBS - Host-dependent libraries against which GDB will be linked
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# for this native target.
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#
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# HAVE_NATIVE_GCORE_HOST - Whether gcore should be installed on this
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# native target.
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#
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# nat_makefile_frag - Name of the (optional) Makefile fragment file
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# required to build the native target. The
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# fragment is incorporated into the Makefile that
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# configure constructs from Makefile.in.
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#
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# Notes:
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#
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# - To avoid shell expansion of variables, declare them with single
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# quotes.
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#
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# - nat_makefile_frag must contain the full path of the file.
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# This first case is useful for filling default values for each
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# gdb_host.
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case ${gdb_host} in
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*linux*)
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NAT_FILE='config/nm-linux.h'
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NATDEPFILES='inf-ptrace.o fork-child.o nat/fork-inferior.o \
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proc-service.o \
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linux-thread-db.o linux-nat.o nat/linux-osdata.o linux-fork.o \
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nat/linux-procfs.o nat/linux-ptrace.o nat/linux-waitpid.o \
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nat/linux-personality.o nat/linux-namespaces.o'
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NAT_CDEPS='$(srcdir)/proc-service.list'
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LOADLIBES='-ldl $(RDYNAMIC)'
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;;
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fbsd*)
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NATDEPFILES='fork-child.o nat/fork-inferior.o inf-ptrace.o fbsd-nat.o'
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HAVE_NATIVE_GCORE_HOST=1
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LOADLIBES='-lkvm'
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;;
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nbsd*)
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NATDEPFILES='fork-child.o nat/fork-inferior.o nat/netbsd-nat.o inf-ptrace.o'
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HAVE_NATIVE_GCORE_HOST=1
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;;
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obsd*)
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NATDEPFILES='fork-child.o nat/fork-inferior.o inf-ptrace.o'
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;;
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cygwin*)
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NATDEPFILES='x86-nat.o nat/x86-dregs.o windows-nat.o nat/windows-nat.o'
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;;
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mingw*)
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NATDEPFILES='x86-nat.o nat/x86-dregs.o windows-nat.o nat/windows-nat.o'
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;;
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aix)
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NATDEPFILES='nat/fork-inferior.o fork-child.o inf-ptrace.o'
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;;
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darwin)
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NATDEPFILES='fork-child.o nat/fork-inferior.o darwin-nat.o \
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darwin-nat-info.o'
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;;
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sol2)
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NATDEPFILES='fork-child.o nat/fork-inferior.o \
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procfs.o proc-api.o proc-events.o proc-flags.o proc-why.o \
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sol-thread.o'
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HAVE_NATIVE_GCORE_HOST=1
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;;
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esac
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# This is where we actually filter by host and host CPU.
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case ${gdb_host} in
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aix)
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case ${gdb_host_cpu} in
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powerpc)
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# Host: IBM PowerPC running AIX aix-thread.o is not
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# listed in NATDEPFILES as it is pulled in by
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# configure.
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NATDEPFILES="${NATDEPFILES} rs6000-nat.o"
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# When compiled with cc, for debugging, this argument
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# should be passed. We have no idea who our current
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# compiler is though, so we skip it.
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# MH_CFLAGS='-bnodelcsect'
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;;
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esac
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;;
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alpha-linux)
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case ${gdb_host_cpu} in
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alpha)
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# Host: Little-endian Alpha running Linux
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NATDEPFILES="${NATDEPFILES} linux-nat-trad.o alpha-linux-nat.o"
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# doublest.c currently assumes some properties of FP arithmetic
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# on the host which require this.
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MH_CFLAGS='-mieee'
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;;
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esac
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;;
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cygwin)
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case ${gdb_host_cpu} in
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i386)
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# Native config information for GDB on i386
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# systems running Cygwin.
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NATDEPFILES="${NATDEPFILES} i386-windows-nat.o"
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;;
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esac
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;;
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cygwin64)
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case ${gdb_host_cpu} in
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i386)
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# Native config information for GDB on amd64
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# systems running Cygwin.
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NATDEPFILES="${NATDEPFILES} i386-windows-nat.o amd64-windows-nat.o"
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;;
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esac
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;;
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darwin)
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case ${gdb_host_cpu} in
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i386)
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# Host: IA86 running Darwin
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NATDEPFILES="${NATDEPFILES} i386-darwin-nat.o x86-nat.o \
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nat/x86-dregs.o amd64-nat.o"
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;;
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esac
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;;
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fbsd)
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case ${gdb_host_cpu} in
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aarch64)
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# Host: FreeBSD/aarch64
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NATDEPFILES="${NATDEPFILES} aarch64-fbsd-nat.o"
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LOADLIBES=
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;;
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arm)
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# Host: FreeBSD/arm
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NATDEPFILES="${NATDEPFILES} arm-fbsd-nat.o"
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LOADLIBES=
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;;
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i386)
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# Host: FreeBSD/i386
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NATDEPFILES="${NATDEPFILES} x86-nat.o nat/x86-dregs.o \
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x86-bsd-nat.o i386-bsd-nat.o i386-fbsd-nat.o bsd-kvm.o"
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;;
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mips)
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# Host: FreeBSD/mips
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NATDEPFILES="${NATDEPFILES} mips-fbsd-nat.o"
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LOADLIBES=
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;;
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powerpc)
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# Native config information for GDB on PowerPC
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# systems running FreeBSD.
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NATDEPFILES="${NATDEPFILES} ppc-fbsd-nat.o bsd-kvm.o"
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;;
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riscv*)
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# Host: FreeBSD/riscv
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NATDEPFILES="${NATDEPFILES} riscv-fbsd-nat.o"
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;;
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sparc)
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# Host: FreeBSD/sparc64
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NATDEPFILES="${NATDEPFILES} sparc-nat.o sparc64-nat.o \
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sparc64-fbsd-nat.o bsd-kvm.o"
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;;
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esac
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;;
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fbsd64)
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case ${gdb_host_cpu} in
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i386)
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# Host: FreeBSD/amd64
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NATDEPFILES="${NATDEPFILES} amd64-nat.o amd64-bsd-nat.o \
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amd64-fbsd-nat.o bsd-kvm.o x86-nat.o nat/x86-dregs.o \
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x86-bsd-nat.o"
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;;
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esac
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;;
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go32)
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case ${gdb_host_cpu} in
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i386)
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# Host: Intel x86 running DJGPP
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# We include several header files from config/djgpp
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MH_CFLAGS='-I$(srcdir)/config/djgpp'
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NATDEPFILES='go32-nat.o x86-nat.o nat/x86-dregs.o'
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XM_CLIBS='-ldbg'
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;;
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esac
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;;
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i386gnu)
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case ${gdb_host_cpu} in
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i386)
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# Host: Intel 386 running the GNU Hurd
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NATDEPFILES='i386-gnu-nat.o gnu-nat.o \
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x86-nat.o nat/x86-dregs.o fork-child.o \
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nat/fork-inferior.o \
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notify_S.o process_reply_S.o msg_reply_S.o \
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msg_U.o exc_request_U.o exc_request_S.o'
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HAVE_NATIVE_GCORE_HOST=1
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NAT_FILE='nm-i386gnu.h'
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MH_CFLAGS='-D_GNU_SOURCE'
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XM_CLIBS='-lshouldbeinlibc'
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nat_makefile_frag="${srcdir}/config/${gdb_host_cpu}/i386gnu.mn"
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;;
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esac
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;;
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linux)
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case ${gdb_host_cpu} in
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aarch64)
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# Host: AArch64 based machine running GNU/Linux
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NATDEPFILES="${NATDEPFILES} aarch64-linux-nat.o \
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aarch32-linux-nat.o nat/aarch64-linux-hw-point.o \
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nat/aarch64-linux.o \
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nat/aarch64-sve-linux-ptrace.o \
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nat/aarch64-mte-linux-ptrace.o"
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;;
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arc)
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# Host: ARC based machine running GNU/Linux
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NATDEPFILES="${NATDEPFILES} arc-linux-nat.o"
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;;
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arm)
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# Host: ARM based machine running GNU/Linux
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NATDEPFILES="${NATDEPFILES} arm-linux-nat.o \
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aarch32-linux-nat.o"
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;;
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i386)
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# Host: Intel 386 running GNU/Linux.
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NATDEPFILES="${NATDEPFILES} x86-nat.o nat/x86-dregs.o \
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i386-linux-nat.o x86-linux-nat.o nat/linux-btrace.o \
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nat/x86-linux.o nat/x86-linux-dregs.o"
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;;
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ia64)
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# Host: Intel IA-64 running GNU/Linux
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NATDEPFILES="${NATDEPFILES} ia64-linux-nat.o"
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;;
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m32r)
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# Host: M32R based machine running GNU/Linux
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NATDEPFILES="${NATDEPFILES} m32r-linux-nat.o"
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;;
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m68k)
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# Host: Motorola m68k running GNU/Linux.
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NATDEPFILES="${NATDEPFILES} m68k-linux-nat.o"
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;;
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mips)
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# Host: Linux/MIPS
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NATDEPFILES="${NATDEPFILES} linux-nat-trad.o \
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mips-linux-nat.o nat/mips-linux-watch.o"
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;;
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pa)
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# Host: Hewlett-Packard PA-RISC machine, running Linux
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NATDEPFILES="${NATDEPFILES} hppa-linux-nat.o"
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;;
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powerpc)
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# Host: PowerPC, running Linux
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NATDEPFILES="${NATDEPFILES} ppc-linux-nat.o nat/ppc-linux.o"
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;;
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riscv*)
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# Host: RISC-V, running Linux
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NATDEPFILES="${NATDEPFILES} riscv-linux-nat.o \
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nat/riscv-linux-tdesc.o"
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;;
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s390)
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# Host: S390, running Linux
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NATDEPFILES="${NATDEPFILES} s390-linux-nat.o"
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;;
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sparc)
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# Host: GNU/Linux SPARC
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NATDEPFILES="${NATDEPFILES} sparc-nat.o sparc-linux-nat.o"
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;;
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tilegx)
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# Host: Tilera TILE-Gx running GNU/Linux.
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NATDEPFILES="${NATDEPFILES} tilegx-linux-nat.o"
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NAT_CDEPS=
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;;
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xtensa)
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# Host: Xtensa, running GNU/Linux.
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NATDEPFILES="${NATDEPFILES} xtensa-linux-nat.o"
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;;
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esac
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;;
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linux64)
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case ${gdb_host_cpu} in
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i386)
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# Host: GNU/Linux x86-64
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NATDEPFILES="${NATDEPFILES} x86-nat.o nat/x86-dregs.o \
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amd64-nat.o amd64-linux-nat.o x86-linux-nat.o \
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nat/linux-btrace.o \
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nat/x86-linux.o nat/x86-linux-dregs.o \
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nat/amd64-linux-siginfo.o"
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;;
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sparc)
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# Host: GNU/Linux UltraSPARC
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NATDEPFILES="${NATDEPFILES} sparc-nat.o sparc64-nat.o \
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sparc64-linux-nat.o"
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;;
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esac
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;;
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mingw)
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case ${gdb_host_cpu} in
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i386)
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NATDEPFILES="${NATDEPFILES} i386-windows-nat.o"
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;;
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esac
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;;
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mingw64)
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case ${gdb_host_cpu} in
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i386)
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NATDEPFILES="${NATDEPFILES} i386-windows-nat.o amd64-windows-nat.o"
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;;
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esac
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;;
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nbsd)
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case ${gdb_host_cpu} in
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alpha)
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# Host: NetBSD/alpha
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NATDEPFILES="${NATDEPFILES} alpha-bsd-nat.o bsd-kvm.o"
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LOADLIBES='-lkvm'
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;;
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mips)
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# Host: NetBSD/mips
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NATDEPFILES="${NATDEPFILES} mips-netbsd-nat.o"
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;;
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pa)
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# Host: NetBSD/hppa
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NATDEPFILES="${NATDEPFILES} netbsd-nat.o hppa-netbsd-nat.o"
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;;
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powerpc)
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# Host: NetBSD/powerpc
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NATDEPFILES="${NATDEPFILES} ppc-netbsd-nat.o bsd-kvm.o"
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LOADLIBES='-lkvm'
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;;
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sh)
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# Host: NetBSD/sh
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NATDEPFILES="${NATDEPFILES} sh-netbsd-nat.o"
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;;
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esac
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;;
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nbsd64)
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case ${gdb_host_cpu} in
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i386)
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# Host: NetBSD/amd64
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NATDEPFILES="${NATDEPFILES} netbsd-nat.o amd64-nat.o x86-nat.o \
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nat/x86-dregs.o x86-bsd-nat.o amd64-bsd-nat.o amd64-netbsd-nat.o"
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;;
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sparc)
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# Host: NetBSD/sparc64
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NATDEPFILES="${NATDEPFILES} sparc64-netbsd-nat.o sparc-nat.o \
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bsd-kvm.o"
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LOADLIBES='-lkvm'
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;;
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esac
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;;
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nbsdelf)
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case ${gdb_host_cpu} in
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arm)
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# Host: NetBSD/arm
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NATDEPFILES="${NATDEPFILES} arm-netbsd-nat.o"
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;;
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i386)
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# Host: NetBSD/i386 ELF
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NATDEPFILES="${NATDEPFILES} netbsd-nat.o x86-nat.o \
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nat/x86-dregs.o \
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x86-bsd-nat.o i386-bsd-nat.o i386-netbsd-nat.o bsd-kvm.o"
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LOADLIBES='-lkvm'
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;;
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m68k)
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# Host: NetBSD/m68k ELF
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NATDEPFILES="${NATDEPFILES} m68k-bsd-nat.o bsd-kvm.o"
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LOADLIBES='-lkvm'
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;;
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sparc)
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# Host: NetBSD/sparc ELF
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NATDEPFILES="${NATDEPFILES} sparc-nat.o sparc-netbsd-nat.o \
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bsd-kvm.o"
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LOADLIBES='-lkvm'
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;;
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vax)
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# Host: NetBSD/vax ELF
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NATDEPFILES="${NATDEPFILES} vax-bsd-nat.o bsd-kvm.o"
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|
LOADLIBES='-lkvm'
|
|
;;
|
|
|
|
esac
|
|
;;
|
|
nto)
|
|
case ${gdb_host_cpu} in
|
|
i386)
|
|
# Host: Intel 386 running QNX.
|
|
NATDEPFILES='nto-procfs.o'
|
|
NAT_FILE='config/nm-nto.h'
|
|
;;
|
|
esac
|
|
;;
|
|
obsd)
|
|
case ${gdb_host_cpu} in
|
|
i386)
|
|
# Host: OpenBSD/i386 ELF
|
|
NATDEPFILES="${NATDEPFILES} obsd-nat.o x86-bsd-nat.o \
|
|
i386-bsd-nat.o i386-obsd-nat.o bsd-kvm.o"
|
|
LOADLIBES='-lkvm'
|
|
;;
|
|
m68k)
|
|
# Host: OpenBSD/m68k
|
|
NATDEPFILES="${NATDEPFILES} m68k-bsd-nat.o bsd-kvm.o"
|
|
LOADLIBES='-lkvm'
|
|
;;
|
|
pa)
|
|
# Host: OpenBSD/hppa
|
|
NATDEPFILES="${NATDEPFILES} obsd-nat.o hppa-obsd-nat.o"
|
|
;;
|
|
powerpc)
|
|
# Host: OpenBSD/powerpc
|
|
NATDEPFILES="${NATDEPFILES} obsd-nat.o ppc-obsd-nat.o bsd-kvm.o"
|
|
LOADLIBES='-lkvm'
|
|
;;
|
|
vax)
|
|
# Host: OpenBSD/vax
|
|
NATDEPFILES="${NATDEPFILES} vax-bsd-nat.o bsd-kvm.o"
|
|
LOADLIBES='-lkvm'
|
|
;;
|
|
esac
|
|
;;
|
|
obsd64)
|
|
case ${gdb_host_cpu} in
|
|
i386)
|
|
# Host: OpenBSD/amd64
|
|
NATDEPFILES="${NATDEPFILES} obsd-nat.o amd64-nat.o \
|
|
x86-bsd-nat.o amd64-bsd-nat.o amd64-obsd-nat.o bsd-kvm.o"
|
|
LOADLIBES='-lkvm'
|
|
;;
|
|
mips)
|
|
# Host: OpenBSD/mips64
|
|
NATDEPFILES="${NATDEPFILES} obsd-nat.o mips64-obsd-nat.o"
|
|
;;
|
|
sparc)
|
|
# Host: OpenBSD/sparc64
|
|
NATDEPFILES="${NATDEPFILES} obsd-nat.o sparc64-obsd-nat.o \
|
|
sparc-nat.o bsd-kvm.o"
|
|
LOADLIBES='-lkvm'
|
|
;;
|
|
esac
|
|
;;
|
|
ppc64-linux)
|
|
case ${gdb_host_cpu} in
|
|
powerpc)
|
|
# Host: PowerPC64, running Linux
|
|
XM_CLIBS=
|
|
NATDEPFILES="${NATDEPFILES} ppc-linux-nat.o nat/ppc-linux.o"
|
|
;;
|
|
esac
|
|
;;
|
|
sol2)
|
|
case ${gdb_host_cpu} in
|
|
i386)
|
|
# Host: Solaris x86_64
|
|
NATDEPFILES="${NATDEPFILES} \
|
|
amd64-nat.o i386-sol2-nat.o"
|
|
;;
|
|
sparc)
|
|
# Host: Solaris SPARC & UltraSPARC
|
|
NAT_FILE='nm-sol2.h'
|
|
NATDEPFILES="${NATDEPFILES} sparc-sol2-nat.o"
|
|
;;
|
|
esac
|
|
;;
|
|
esac
|