arch/xtensa/kernel/Makefile

Source file repositories/reference/linux-study-clean/arch/xtensa/kernel/Makefile

File Facts

System
Linux kernel
Corpus path
arch/xtensa/kernel/Makefile
Extension
[no extension]
Size
1857 bytes
Lines
47
Domain
Architecture Layer
Bucket
arch/xtensa
Inferred role
Architecture Layer: build/configuration rule
Status
atlas-only

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

# SPDX-License-Identifier: GPL-2.0
#
# Makefile for the Linux/Xtensa kernel.
#

always-$(KBUILD_BUILTIN) := vmlinux.lds

obj-y := head.o align.o coprocessor.o entry.o irq.o platform.o process.o \
	 ptrace.o setup.o signal.o stacktrace.o syscall.o time.o traps.o \
	 vectors.o

obj-$(CONFIG_MMU) += pci-dma.o
obj-$(CONFIG_PCI) += pci.o
obj-$(CONFIG_MODULES) += xtensa_ksyms.o module.o
obj-$(CONFIG_FUNCTION_TRACER) += mcount.o
obj-$(CONFIG_SMP) += smp.o
obj-$(CONFIG_SECONDARY_RESET_VECTOR) += mxhead.o
obj-$(CONFIG_XTENSA_VARIANT_HAVE_PERF_EVENTS) += perf_event.o
obj-$(CONFIG_HAVE_HW_BREAKPOINT) += hw_breakpoint.o
obj-$(CONFIG_S32C1I_SELFTEST) += s32c1i_selftest.o
obj-$(CONFIG_JUMP_LABEL) += jump_label.o
obj-$(CONFIG_HIBERNATION) += hibernate.o

# In the Xtensa architecture, assembly generates literals which must always
# precede the L32R instruction with a relative offset less than 256 kB.
# Therefore, the .text and .literal section must be combined in parenthesis
# in the linker script, such as: *(.literal .text).
#
# We need to post-process the generated vmlinux.lds scripts to convert
# *(xxx.text) to  *(xxx.literal xxx.text) for the following text sections:
#   .text .ref.text .*init.text .*exit.text .text.*
#
# Replicate rules in scripts/Makefile.build

sed-y = -e ':a; s/\*(\([^)]*\)\.text\.unlikely/*(\1.literal.unlikely .{text}.unlikely/; ta; ' \
	-e ':b; s/\*(\([^)]*\)\.text\(\.[a-z]*\)/*(\1.{text}\2.literal .{text}\2/; tb; ' \
	-e ':c; s/\*(\([^)]*\)\(\.[a-z]*it\|\.ref\)\.text/*(\1\2.literal \2.{text}/; tc; ' \
	-e ':d; s/\*(\([^)]\+ \|\)\.text/*(\1.literal .{text}/; td; ' \
	-e 's/\.{text}/.text/g'

quiet_cmd__cpp_lds_S = LDS     $@
cmd__cpp_lds_S = $(CPP) $(cpp_flags) -P -C -Uxtensa -D__ASSEMBLY__ \
		 -DLINKER_SCRIPT $< | sed $(sed-y) >$@

$(obj)/vmlinux.lds: $(src)/vmlinux.lds.S FORCE
	$(call if_changed_dep,_cpp_lds_S)

Annotation

Implementation Notes