mirror of
https://github.com/bminor/binutils-gdb.git
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63b862be76
This patch adds the user mode register PL3_SSP which is part of the
Intel(R) Control-Flow Enforcement Technology (CET) feature for support
of shadow stack.
For now, only native and remote debugging support for shadow stack
userspace on amd64 linux are covered by this patch including 64 bit and
x32 support. 32 bit support is not covered due to missing Linux kernel
support.
This patch requires fixing the test gdb.base/inline-frame-cycle-unwind
which is failing in case the shadow stack pointer is unavailable.
Such a state is possible if shadow stack is disabled for the current thread
but supported by HW.
This test uses the Python unwinder inline-frame-cycle-unwind.py which fakes
the cyclic stack cycle by reading the pending frame's registers and adding
them to the unwinder:
~~~
for reg in pending_frame.architecture().registers("general"):
val = pending_frame.read_register(reg)
unwinder.add_saved_register(reg, val)
return unwinder
~~~
However, in case the python unwinder is used we add a register (pl3_ssp) that is
unavailable. This leads to a NOT_AVAILABLE_ERROR caught in
gdb/frame-unwind.c:frame_unwind_try_unwinder and it is continued with standard
unwinders. This destroys the faked cyclic behavior and the stack is
further unwinded after frame 5.
In the working scenario an error should be triggered:
~~~
bt
0 inline_func () at /tmp/gdb.base/inline-frame-cycle-unwind.c:49^M
1 normal_func () at /tmp/gdb.base/inline-frame-cycle-unwind.c:32^M
2 0x000055555555516e in inline_func () at /tmp/gdb.base/inline-frame-cycle-unwind.c:45^M
3 normal_func () at /tmp/gdb.base/inline-frame-cycle-unwind.c:32^M
4 0x000055555555516e in inline_func () at /tmp/gdb.base/inline-frame-cycle-unwind.c:45^M
5 normal_func () at /tmp/gdb.base/inline-frame-cycle-unwind.c:32^M
Backtrace stopped: previous frame identical to this frame (corrupt stack?)
(gdb) PASS: gdb.base/inline-frame-cycle-unwind.exp: cycle at level 5: backtrace when the unwind is broken at frame 5
~~~
To fix the Python unwinder, we simply skip the unavailable registers.
Also it makes the test gdb.dap/scopes.exp fail. The shadow stack feature is
disabled by default, so the pl3_ssp register which is added with my CET
shadow stack series will be shown as unavailable and we see a TCL error:
~~
>>> {"seq": 12, "type": "request", "command": "variables", "arguments": {"variablesReference": 2, "count": 85}}
Content-Length: 129^M
^M
{"request_seq": 12, "type": "response", "command": "variables", "success": false, "message": "value is not available", "seq": 25}FAIL: gdb.dap/scopes.exp: fetch all registers success
ERROR: tcl error sourcing /tmp/gdb/testsuite/gdb.dap/scopes.exp.
ERROR: tcl error code TCL LOOKUP DICT body
ERROR: key "body" not known in dictionary
while executing
"dict get $val body variables"
(file "/tmp/gdb/testsuite/gdb.dap/scopes.exp" line 152)
invoked from within
"source /tmp/gdb/testsuite/gdb.dap/scopes.exp"
("uplevel" body line 1)
invoked from within
"uplevel #0 source /tmp/gdb/testsuite/gdb.dap/scopes.exp"
invoked from within
"catch "uplevel #0 source $test_file_name" msg"
UNRESOLVED: gdb.dap/scopes.exp: testcase '/tmp/gdb/testsuite/gdb.dap/scopes.exp' aborted due to Tcl error
~~
I am fixing this by enabling the test for CET shadow stack, in case we
detect that the HW supports it:
~~~
# If x86 shadow stack is supported we need to configure GLIBC_TUNABLES
# such that the feature is enabled and the register pl3_ssp is
# available. Otherwise the reqeust to fetch all registers will fail
# with "message": "value is not available".
if { [allow_ssp_tests] } {
append_environment GLIBC_TUNABLES "glibc.cpu.hwcaps" "SHSTK"
}
~~~
Reviewed-by: Thiago Jung Bauermann <thiago.bauermann@linaro.org>
Reviewed-By: Eli Zaretskii <eliz@gnu.org>
Approved-By: Luis Machado <luis.machado@arm.com>
Approved-By: Andrew Burgess <aburgess@redhat.com>
287 lines
8.8 KiB
Makefile
287 lines
8.8 KiB
Makefile
# Copyright (C) 2007-2025 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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#
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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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# This file requires GNU make!
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# This Makefile updates files in ../regformats from their XML master
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# copies. Because this relies on xsltproc, it is not normally run
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# during the build process; it should be run by hand when one of the
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# affected XML files is changed, and the results should be kept in the
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# GDB repository.
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# It can also update the C files in the features directory from their
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# XML master copies. This relies on a GDB linked with expat and that
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# is configured to include support for the architecture, so the files
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# are kept in the GDB repository.
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#
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# By default we'll generate all C files, and you must point make at a
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# GDB that has been configured with --enable-targets=all:
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#
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# make GDB=/path/to/gdb cfiles
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#
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# To regenerate all C files from scratch:
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#
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# make GDB=/path/to/gdb clean-cfiles cfiles
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#
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# To generate specific C files, you can override the XMLTOC and
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# FEATURE_XMLFILES make variables:
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#
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# make GDB=/path/to/gdb XMLTOC="xml files" FEATURE_XMLFILES="xml files" cfiles
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# List of .dat files to create in ../regformats/
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WHICH = mips-linux mips-dsp-linux \
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mips64-linux mips64-dsp-linux \
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microblaze-linux \
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or1k-linux \
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rs6000/powerpc-32 \
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rs6000/powerpc-32l rs6000/powerpc-altivec32l rs6000/powerpc-e500l \
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rs6000/powerpc-64l rs6000/powerpc-altivec64l rs6000/powerpc-vsx32l \
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rs6000/powerpc-vsx64l \
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rs6000/powerpc-isa205-32l rs6000/powerpc-isa205-64l \
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rs6000/powerpc-isa205-altivec32l rs6000/powerpc-isa205-altivec64l \
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rs6000/powerpc-isa205-vsx32l rs6000/powerpc-isa205-vsx64l \
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rs6000/powerpc-isa205-ppr-dscr-vsx32l \
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rs6000/powerpc-isa205-ppr-dscr-vsx64l \
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rs6000/powerpc-isa207-vsx32l rs6000/powerpc-isa207-vsx64l \
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rs6000/powerpc-isa207-htm-vsx32l \
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rs6000/powerpc-isa207-htm-vsx64l \
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s390-linux32 s390-linux64 s390x-linux64 \
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s390-linux32v1 s390-linux64v1 s390x-linux64v1 \
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s390-linux32v2 s390-linux64v2 s390x-linux64v2 \
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s390-te-linux64 s390x-te-linux64 s390-vx-linux64 s390x-vx-linux64 \
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s390-tevx-linux64 s390x-tevx-linux64 \
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s390-gs-linux64 s390x-gs-linux64 \
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tic6x-c64xp-linux tic6x-c64x-linux tic6x-c62x-linux
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# Record which registers should be sent to GDB by default after stop.
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microblaze-expedite = r1,rpc
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mips-expedite = r29,pc
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mips-dsp-expedite = r29,pc
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mips64-expedite = r29,pc
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mips64-dsp-expedite = r29,pc
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or1k-expedite = r1,npc
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powerpc-expedite = r1,pc
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s390-linux32-expedite = r14,r15,pswa
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s390-linux32v1-expedite = r14,r15,pswa
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s390-linux32v2-expedite = r14,r15,pswa
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s390-linux64-expedite = r14l,r15l,pswa
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s390-linux64v1-expedite = r14l,r15l,pswa
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s390-linux64v2-expedite = r14l,r15l,pswa
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s390-te-linux64-expedite = r14l,r15l,pswa
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s390-vx-linux64-expedite = r14l,r15l,pswa
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s390-tevx-linux64-expedite = r14l,r15l,pswa
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s390-gs-linux64-expedite = r14,r15,pswa
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s390x-expedite = r14,r15,pswa
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tic6x-expedite = A15,PC
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XSLTPROC = xsltproc
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outdir = ../regformats
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OUTPUTS = $(patsubst %,$(outdir)/%.dat,$(WHICH))
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# For targets without feature based target descriptions,
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# the set of xml files we'll generate .c files for GDB from. By
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# default we'll build all .c files, which requires an
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# --enable-targets=all GDB. You can override this by passing XMLTOC
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# to make on the command line.
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XMLTOC = \
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alpha.xml \
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microblaze-with-stack-protect.xml \
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microblaze.xml \
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mips-dsp-linux.xml \
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mips-linux.xml \
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mips64-dsp-linux.xml \
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mips64-linux.xml \
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nds32.xml \
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or1k.xml \
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or1k-linux.xml \
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rs6000/powerpc-32.xml \
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rs6000/powerpc-32l.xml \
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rs6000/powerpc-403.xml \
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rs6000/powerpc-403gc.xml \
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rs6000/powerpc-405.xml \
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rs6000/powerpc-505.xml \
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rs6000/powerpc-601.xml \
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rs6000/powerpc-602.xml \
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rs6000/powerpc-603.xml \
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rs6000/powerpc-604.xml \
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rs6000/powerpc-64.xml \
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rs6000/powerpc-64l.xml \
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rs6000/powerpc-7400.xml \
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rs6000/powerpc-750.xml \
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rs6000/powerpc-860.xml \
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rs6000/powerpc-altivec32.xml \
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rs6000/powerpc-altivec32l.xml \
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rs6000/powerpc-altivec64.xml \
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rs6000/powerpc-altivec64l.xml \
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rs6000/powerpc-e500.xml \
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rs6000/powerpc-e500l.xml \
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rs6000/powerpc-isa205-32l.xml \
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rs6000/powerpc-isa205-64l.xml \
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rs6000/powerpc-isa205-altivec32l.xml \
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rs6000/powerpc-isa205-altivec64l.xml \
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rs6000/powerpc-isa205-vsx32l.xml \
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rs6000/powerpc-isa205-vsx64l.xml \
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rs6000/powerpc-isa205-ppr-dscr-vsx32l.xml \
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rs6000/powerpc-isa205-ppr-dscr-vsx64l.xml \
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rs6000/powerpc-isa207-vsx32l.xml \
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rs6000/powerpc-isa207-vsx64l.xml \
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rs6000/powerpc-isa207-htm-vsx32l.xml \
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rs6000/powerpc-isa207-htm-vsx64l.xml \
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rs6000/powerpc-vsx32.xml \
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rs6000/powerpc-vsx32l.xml \
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rs6000/powerpc-vsx64.xml \
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rs6000/powerpc-vsx64l.xml \
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rs6000/rs6000.xml \
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rx.xml \
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s390-linux32.xml \
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s390-linux32v1.xml \
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s390-linux32v2.xml \
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s390-linux64.xml \
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s390-linux64v1.xml \
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s390-linux64v2.xml \
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s390-te-linux64.xml \
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s390x-linux64.xml \
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s390x-linux64v1.xml \
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s390x-linux64v2.xml \
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s390x-te-linux64.xml \
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s390-tevx-linux64.xml \
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s390-vx-linux64.xml \
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s390x-tevx-linux64.xml \
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s390x-vx-linux64.xml \
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s390-gs-linux64.xml \
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s390x-gs-linux64.xml \
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sparc/sparc32-solaris.xml \
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sparc/sparc64-solaris.xml \
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z80.xml
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TDESC_CFILES = $(patsubst %.xml,%.c,$(XMLTOC))
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GDB = false
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#Targets which use feature based target descriptions.
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aarch64-feature = 1
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arm-feature = 1
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i386-feature = 1
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loongarch-feature = 1
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riscv-feature = 1
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tic6x-feature = 1
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all: $(OUTPUTS)
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$(outdir)/%.dat: %.xml number-regs.xsl sort-regs.xsl gdbserver-regs.xsl
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echo "# THIS FILE IS GENERATED. -*- buffer-read-only: t -*- vi :set ro:" > $(outdir)/$*.tmp
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echo "# Generated from: $<" >> $(outdir)/$*.tmp
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echo "name:`echo $(notdir $*) | sed 's/-/_/g'`" >> $(outdir)/$*.tmp
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$(if $($(firstword $(subst /, ,$(subst -, ,$*)))-feature), echo "feature:1") >> $(outdir)/$*.tmp
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echo "xmltarget:$(<F)" >> $(outdir)/$*.tmp
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echo "expedite:$(if $($*-expedite),$($*-expedite),$($(firstword $(subst -, ,$(notdir $*)))-expedite))" \
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>> $(outdir)/$*.tmp
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$(XSLTPROC) --path "$(PWD)" --xinclude print-osabi.xsl $< \
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>> $(outdir)/$*.tmp
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$(XSLTPROC) --path "$(PWD)" --xinclude number-regs.xsl $< | \
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$(XSLTPROC) sort-regs.xsl - | \
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$(XSLTPROC) gdbserver-regs.xsl - >> $(outdir)/$*.tmp
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sh ../../move-if-change $(outdir)/$*.tmp $(outdir)/$*.dat
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# For targets with feature based target descriptions,
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# the set of xml files we'll generate .c files for GDB from.
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FEATURE_XMLFILES = aarch64-core.xml \
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aarch64-fpu.xml \
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aarch64-pauth.xml \
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aarch64-mte.xml \
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arc/v1-core.xml \
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arc/v1-aux.xml \
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arc/v2-core.xml \
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arc/v2-aux.xml \
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arm/arm-core.xml \
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arm/arm-fpa.xml \
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arm/arm-m-profile.xml \
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arm/arm-m-profile-mve.xml \
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arm/arm-m-system.xml \
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arm/arm-m-profile-with-fpa.xml \
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arm/arm-secext.xml \
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arm/arm-tls.xml \
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arm/arm-vfpv2.xml \
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arm/arm-vfpv3.xml \
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arm/xscale-iwmmxt.xml \
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cskyv2-linux.xml \
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i386/32bit-core.xml \
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i386/32bit-sse.xml \
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i386/32bit-linux.xml \
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i386/32bit-avx.xml \
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i386/32bit-avx512.xml \
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i386/32bit-segments.xml \
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i386/32bit-ssp.xml \
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i386/64bit-avx512.xml \
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i386/64bit-core.xml \
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i386/64bit-segments.xml \
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i386/64bit-avx.xml \
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i386/64bit-linux.xml \
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i386/64bit-sse.xml \
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i386/pkeys.xml \
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i386/64bit-ssp.xml \
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i386/x32-core.xml \
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loongarch/base32.xml \
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loongarch/base64.xml \
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loongarch/fpu.xml \
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loongarch/lsx.xml \
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loongarch/lasx.xml \
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loongarch/lbt.xml \
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riscv/rv32e-xregs.xml \
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riscv/32bit-cpu.xml \
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riscv/32bit-fpu.xml \
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riscv/64bit-cpu.xml \
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riscv/64bit-fpu.xml \
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tic6x-c6xp.xml \
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tic6x-core.xml \
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tic6x-gp.xml
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FEATURE_CFILES = $(patsubst %.xml,%.c,$(FEATURE_XMLFILES))
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cfiles: $(TDESC_CFILES) $(FEATURE_CFILES)
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$(TDESC_CFILES): %.c: %.xml
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$(GDB) -nx -q -batch -ex 'maint print c-tdesc $<' > $@.tmp
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sh ../../move-if-change $@.tmp $@
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$(FEATURE_CFILES): %.c: %.xml.tmp
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$(GDB) -nx -q -batch \
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-ex 'maint print c-tdesc -single-feature $<' > $@.tmp
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sh ../../move-if-change $@.tmp $@
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rm $<
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# %.xml is the XML file for each target description feature, and
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# %.xml.tmp is the XML file target description which only includes
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# one target description feature.
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%.xml.tmp: %.xml
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echo "<?xml version=\"1.0\"?>" > $@.tmp
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echo "<!DOCTYPE target SYSTEM \"gdb-target.dtd\">" >> $@.tmp
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echo "<target>" >> $@.tmp
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echo " <xi:include href=\"$(notdir $<)\"/>" >> $@.tmp
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echo "</target>" >> $@.tmp
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sh ../../move-if-change $@.tmp $@
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# 'all' doesn't build the C files, so don't delete them in 'clean'
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# either.
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clean-cfiles:
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rm -f $(TDESC_CFILES) $(FEATURE_CFILES)
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clean:
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rm -f $(OUTPUTS)
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