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[3/6] kbuild: generate a linker map for vmlinux.o

Message ID 20231208050752.2787575-4-kris.van.hees@oracle.com (mailing list archive)
State New, archived
Headers show
Series Generate address range data for built-in modules | expand

Commit Message

Kris Van Hees Dec. 8, 2023, 5:07 a.m. UTC 
When CONFIG_BUILTIN_RANGES is set, a linker map for vmlinux.o needs to
be generated.  The generation of offset range data for builtin modules
depends on that linker map to know what offsets in an ELF section belong
to an object file for a particular builtin module.

Signed-off-by: Kris Van Hees <kris.van.hees@oracle.com>
Reviewed-by: Nick Alcock <nick.alcock@oracle.com>
---
 scripts/Makefile.vmlinux_o | 3 +++
 1 file changed, 3 insertions(+)
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Patch

diff --git a/scripts/Makefile.vmlinux_o b/scripts/Makefile.vmlinux_o
index bfb84efcef39..9e35cb0ed862 100644
--- a/scripts/Makefile.vmlinux_o
+++ b/scripts/Makefile.vmlinux_o
@@ -45,9 +45,12 @@  objtool-args = $(vmlinux-objtool-args-y) --link
 # Link of vmlinux.o used for section mismatch analysis
 # ---------------------------------------------------------------------------
 
+vmlinux-o-ld-args-$(CONFIG_BUILTIN_RANGES)		+= -Map=$@.map
+
 quiet_cmd_ld_vmlinux.o = LD      $@
       cmd_ld_vmlinux.o = \
 	$(LD) ${KBUILD_LDFLAGS} -r -o $@ \
+	$(vmlinux-o-ld-args-y) \
 	$(addprefix -T , $(initcalls-lds)) \
 	--whole-archive vmlinux.a --no-whole-archive \
 	--start-group $(KBUILD_VMLINUX_LIBS) --end-group \