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64711f9a47
Use 3-byte 'nop' and 'j' instructions that are always present. Don't let assembler mark a spot right after patchable 'j' instruction as unreachable and later put literals or padding bytes there. Add separate implementations of patch_text for SMP and UP cases, avoiding use of atomics on UP. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
44 lines
1.7 KiB
Makefile
44 lines
1.7 KiB
Makefile
# SPDX-License-Identifier: GPL-2.0
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#
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# Makefile for the Linux/Xtensa kernel.
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#
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extra-y := head.o vmlinux.lds
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obj-y := align.o coprocessor.o entry.o irq.o pci-dma.o platform.o process.o \
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ptrace.o setup.o signal.o stacktrace.o syscall.o time.o traps.o \
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vectors.o
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obj-$(CONFIG_PCI) += pci.o
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obj-$(CONFIG_MODULES) += xtensa_ksyms.o module.o
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obj-$(CONFIG_FUNCTION_TRACER) += mcount.o
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obj-$(CONFIG_SMP) += smp.o mxhead.o
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obj-$(CONFIG_XTENSA_VARIANT_HAVE_PERF_EVENTS) += perf_event.o
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obj-$(CONFIG_HAVE_HW_BREAKPOINT) += hw_breakpoint.o
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obj-$(CONFIG_S32C1I_SELFTEST) += s32c1i_selftest.o
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obj-$(CONFIG_JUMP_LABEL) += jump_label.o
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# In the Xtensa architecture, assembly generates literals which must always
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# precede the L32R instruction with a relative offset less than 256 kB.
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# Therefore, the .text and .literal section must be combined in parenthesis
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# in the linker script, such as: *(.literal .text).
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#
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# We need to post-process the generated vmlinux.lds scripts to convert
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# *(xxx.text) to *(xxx.literal xxx.text) for the following text sections:
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# .text .ref.text .*init.text .*exit.text .text.*
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#
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# Replicate rules in scripts/Makefile.build
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sed-y = -e ':a; s/\*(\([^)]*\)\.text\.unlikely/*(\1.literal.unlikely .{text}.unlikely/; ta; ' \
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-e ':b; s/\*(\([^)]*\)\.text\(\.[a-z]*\)/*(\1.{text}\2.literal .{text}\2/; tb; ' \
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-e ':c; s/\*(\([^)]*\)\(\.[a-z]*it\|\.ref\)\.text/*(\1\2.literal \2.{text}/; tc; ' \
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-e ':d; s/\*(\([^)]\+ \|\)\.text/*(\1.literal .{text}/; td; ' \
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-e 's/\.{text}/.text/g'
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quiet_cmd__cpp_lds_S = LDS $@
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cmd__cpp_lds_S = $(CPP) $(cpp_flags) -P -C -Uxtensa -D__ASSEMBLY__ \
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-DLINKER_SCRIPT $< | sed $(sed-y) >$@
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$(obj)/vmlinux.lds: $(src)/vmlinux.lds.S FORCE
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$(call if_changed_dep,_cpp_lds_S)
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