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The kernel CONFIG_UNWINDER_ORC option enables the ORC unwinder, which is similar in concept to a DWARF unwinder. The difference is that the format of the ORC data is much simpler than DWARF, which in turn allows the ORC unwinder to be much simpler and faster. The ORC data consists of unwind tables which are generated by objtool. After analyzing all the code paths of a .o file, it determines information about the stack state at each instruction address in the file and outputs that information to the .orc_unwind and .orc_unwind_ip sections. The per-object ORC sections are combined at link time and are sorted and post-processed at boot time. The unwinder uses the resulting data to correlate instruction addresses with their stack states at run time. Most of the logic are similar with x86, in order to get ra info before ra is saved into stack, add ra_reg and ra_offset into orc_entry. At the same time, modify some arch-specific code to silence the objtool warnings. Co-developed-by: Jinyang He <hejinyang@loongson.cn> Signed-off-by: Jinyang He <hejinyang@loongson.cn> Co-developed-by: Youling Tang <tangyouling@loongson.cn> Signed-off-by: Youling Tang <tangyouling@loongson.cn> Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
59 lines
1.9 KiB
Makefile
59 lines
1.9 KiB
Makefile
# SPDX-License-Identifier: GPL-2.0
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###
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# scripts contains sources for various helper programs used throughout
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# the kernel for the build process.
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hostprogs-always-$(CONFIG_KALLSYMS) += kallsyms
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hostprogs-always-$(BUILD_C_RECORDMCOUNT) += recordmcount
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hostprogs-always-$(CONFIG_BUILDTIME_TABLE_SORT) += sorttable
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hostprogs-always-$(CONFIG_ASN1) += asn1_compiler
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hostprogs-always-$(CONFIG_MODULE_SIG_FORMAT) += sign-file
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hostprogs-always-$(CONFIG_SYSTEM_EXTRA_CERTIFICATE) += insert-sys-cert
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hostprogs-always-$(CONFIG_RUST_KERNEL_DOCTESTS) += rustdoc_test_builder
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hostprogs-always-$(CONFIG_RUST_KERNEL_DOCTESTS) += rustdoc_test_gen
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always-$(CONFIG_RUST) += target.json
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filechk_rust_target = $< < include/config/auto.conf
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$(obj)/target.json: scripts/generate_rust_target include/config/auto.conf FORCE
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$(call filechk,rust_target)
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hostprogs += generate_rust_target
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generate_rust_target-rust := y
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rustdoc_test_builder-rust := y
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rustdoc_test_gen-rust := y
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HOSTCFLAGS_sorttable.o = -I$(srctree)/tools/include
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HOSTLDLIBS_sorttable = -lpthread
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HOSTCFLAGS_asn1_compiler.o = -I$(srctree)/include
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HOSTCFLAGS_sign-file.o = $(shell $(HOSTPKG_CONFIG) --cflags libcrypto 2> /dev/null)
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HOSTLDLIBS_sign-file = $(shell $(HOSTPKG_CONFIG) --libs libcrypto 2> /dev/null || echo -lcrypto)
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ifdef CONFIG_UNWINDER_ORC
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ifeq ($(ARCH),x86_64)
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SRCARCH := x86
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endif
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ifeq ($(ARCH),loongarch)
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SRCARCH := loongarch
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endif
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HOSTCFLAGS_sorttable.o += -I$(srctree)/tools/arch/$(SRCARCH)/include
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HOSTCFLAGS_sorttable.o += -DUNWINDER_ORC_ENABLED
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endif
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ifdef CONFIG_BUILDTIME_MCOUNT_SORT
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HOSTCFLAGS_sorttable.o += -DMCOUNT_SORT_ENABLED
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endif
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# The following programs are only built on demand
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hostprogs += unifdef
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# The module linker script is preprocessed on demand
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targets += module.lds
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subdir-$(CONFIG_GCC_PLUGINS) += gcc-plugins
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subdir-$(CONFIG_MODVERSIONS) += genksyms
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subdir-$(CONFIG_SECURITY_SELINUX) += selinux
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# Let clean descend into subdirs
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subdir- += basic dtc gdb kconfig mod
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