arch/xtensa/kernel/Makefile

   1 #
   2 # Makefile for the Linux/Xtensa kernel.
   3 #
   4
   5 extra-y := head.o vmlinux.lds
   6
   7 obj-y := align.o coprocessor.o entry.o irq.o pci-dma.o platform.o process.o \
   8          ptrace.o setup.o signal.o stacktrace.o syscall.o time.o traps.o \
   9          vectors.o
  10
  11 obj-$(CONFIG_KGDB) += xtensa-stub.o
  12 obj-$(CONFIG_PCI) += pci.o
  13 obj-$(CONFIG_MODULES) += xtensa_ksyms.o module.o
  14 obj-$(CONFIG_FUNCTION_TRACER) += mcount.o
  15 obj-$(CONFIG_SMP) += smp.o mxhead.o
  16 obj-$(CONFIG_XTENSA_VARIANT_HAVE_PERF_EVENTS) += perf_event.o
  17
  18 AFLAGS_head.o += -mtext-section-literals
  19
  20 # In the Xtensa architecture, assembly generates literals which must always
  21 # precede the L32R instruction with a relative offset less than 256 kB.
  22 # Therefore, the .text and .literal section must be combined in parenthesis
  23 # in the linker script, such as: *(.literal .text).
  24 #
  25 # We need to post-process the generated vmlinux.lds scripts to convert
  26 # *(xxx.text) to  *(xxx.literal xxx.text) for the following text sections:
  27 #   .text .ref.text .*init.text .*exit.text .text.*
  28 #
  29 # Replicate rules in scripts/Makefile.build
  30
  31 sed-y = -e ':a; s/\*(\([^)]*\)\.text\.unlikely/*(\1.literal.unlikely .{text}.unlikely/; ta; ' \
  32         -e ':b; s/\*(\([^)]*\)\.text\(\.[a-z]*\)/*(\1.{text}\2.literal .{text}\2/; tb; ' \
  33         -e ':c; s/\*(\([^)]*\)\(\.[a-z]*it\|\.ref\)\.text/*(\1\2.literal \2.{text}/; tc; ' \
  34         -e ':d; s/\*(\([^)]\+ \|\)\.text/*(\1.literal .{text}/; td; ' \
  35         -e 's/\.{text}/.text/g'
  36
  37 quiet_cmd__cpp_lds_S = LDS     $@
  38 cmd__cpp_lds_S = $(CPP) $(cpp_flags) -P -C -Uxtensa -D__ASSEMBLY__ $<    \
  39                  | sed $(sed-y) >$@
  40
  41 $(obj)/vmlinux.lds: $(src)/vmlinux.lds.S FORCE
  42         $(call if_changed_dep,_cpp_lds_S)