This emits a new file, .tmp_vmlinux.ranges, which maps address range/size pairs in vmlinux to the object files which make them up, e.g., in part: 0x0000000000000000 0x30 arch/x86/kernel/cpu/common.o 0x0000000000001000 0x1000 arch/x86/events/intel/ds.o 0x0000000000002000 0x4000 arch/x86/kernel/irq_64.o 0x0000000000006000 0x5000 arch/x86/kernel/process.o 0x000000000000b000 0x1000 arch/x86/kernel/cpu/common.o 0x000000000000c000 0x5000 arch/x86/mm/cpu_entry_area.o 0x0000000000011000 0x10 arch/x86/kernel/espfix_64.o 0x0000000000011010 0x2 arch/x86/kernel/cpu/common.o [...] In my simple tests this seems to work with clang too, but if I'm not sure how stable the format of clang's linker mapfiles is: if it turns out not to work in some versions, the mapfile-massaging awk script added here might need some adjustment. Signed-off-by: Nick Alcock <nick.alcock@xxxxxxxxxx> --- scripts/link-vmlinux.sh | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/scripts/link-vmlinux.sh b/scripts/link-vmlinux.sh index 0e0f6466b18d..00ad1b4b0055 100755 --- a/scripts/link-vmlinux.sh +++ b/scripts/link-vmlinux.sh @@ -178,6 +178,7 @@ vmlinux_link() objects="--whole-archive \ vmlinux.o \ --no-whole-archive \ + -Map=.tmp_vmlinux.map \ ${@}" else objects="--whole-archive \ @@ -186,6 +187,7 @@ vmlinux_link() --start-group \ ${KBUILD_VMLINUX_LIBS} \ --end-group \ + -Map=.tmp_vmlinux.map \ ${@}" fi @@ -201,6 +203,7 @@ vmlinux_link() -Wl,--start-group \ ${KBUILD_VMLINUX_LIBS} \ -Wl,--end-group \ + -Wl,-Map=.tmp_vmlinux.map \ ${@}" ${CC} ${CFLAGS_vmlinux} \ @@ -259,6 +262,19 @@ kallsyms() { local kallsymopt; + # read the linker map to identify ranges of addresses: + # - for each *.o file, report address, size, pathname + # - most such lines will have four fields + # - but sometimes there is a line break after the first field + # - start reading at "Linker script and memory map" + # - stop reading at ".brk" + ${AWK} ' + /\.o$/ && start==1 { print $(NF-2), $(NF-1), $NF } + /^Linker script and memory map/ { start = 1 } + /^\.brk/ { exit(0) } + ' .tmp_vmlinux.map | sort > .tmp_vmlinux.ranges + + # get kallsyms options if [ -n "${CONFIG_KALLSYMS_ALL}" ]; then kallsymopt="${kallsymopt} --all-symbols" fi -- 2.32.0.255.gd9b1d14a2a