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e78a588b59
[ Upstream commit 27f2a4db76
]
GDB produces the following warning when debugging kernels built with
CONFIG_RELR:
BFD: /android0/linux-next/vmlinux: unknown type [0x13] section `.relr.dyn'
when loading a kernel built with CONFIG_RELR into GDB. It can also
prevent debugging symbols using such relocations.
Peter sugguests:
[That flag] means that lld will use dynamic tags and section type
numbers in the OS-specific range rather than the generic range. The
kernel itself doesn't care about these numbers; it determines the
location of the RELR section using symbols defined by a linker script.
Link: https://github.com/ClangBuiltLinux/linux/issues/1057
Suggested-by: Peter Collingbourne <pcc@google.com>
Reviewed-by: Nathan Chancellor <nathan@kernel.org>
Signed-off-by: Nick Desaulniers <ndesaulniers@google.com>
Link: https://lore.kernel.org/r/20210522012626.2811297-1-ndesaulniers@google.com
Signed-off-by: Will Deacon <will@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
17 lines
546 B
Bash
Executable file
17 lines
546 B
Bash
Executable file
#!/bin/sh -eu
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# SPDX-License-Identifier: GPL-2.0
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tmp_file=$(mktemp)
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trap "rm -f $tmp_file.o $tmp_file $tmp_file.bin" EXIT
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cat << "END" | $CC -c -x c - -o $tmp_file.o >/dev/null 2>&1
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void *p = &p;
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END
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$LD $tmp_file.o -shared -Bsymbolic --pack-dyn-relocs=relr \
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--use-android-relr-tags -o $tmp_file
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# Despite printing an error message, GNU nm still exits with exit code 0 if it
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# sees a relr section. So we need to check that nothing is printed to stderr.
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test -z "$($NM $tmp_file 2>&1 >/dev/null)"
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$OBJCOPY -O binary $tmp_file $tmp_file.bin
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