From f69a99dbf843da7f4c2b4965004140d2ea83cd67 Mon Sep 17 00:00:00 2001 From: Aaron Durbin Date: Tue, 10 Mar 2015 11:45:25 -0500 Subject: coreboot: x86: enable gc-sections Garbage collected sections allow for trimming the size of the binaries as well as allowing for not needing to config off unused functions. To that end, on a rambi build the following differences are observed: $ diff -up \ <(readelf -l coreboot-builds/google_rambi/cbfs/fallback/ramstage.elf) \ <(readelf -l coreboot-builds/google_rambi_gc_sections/cbfs/fallback/ramstage.elf) --- /dev/fd/63 2015-03-10 12:07:27.927985430 -0500 +++ /dev/fd/62 2015-03-10 12:07:27.927985430 -0500 @@ -6,9 +6,9 @@ There are 4 program headers, starting at Program Headers: Type Offset VirtAddr PhysAddr FileSiz MemSiz Flg Align LOAD 0x001000 0x00000000 0x00000000 0x00040 0x00040 RWE 0 - LOAD 0x001040 0x00000040 0x00000040 0x34560 0x34560 RWE 0 - LOAD 0x0355a0 0x000345a0 0x000345a0 0x02578 0x02578 RWE 0 - LOAD 0x037b18 0x00036b18 0x00036b18 0x00000 0x0b560 0 + LOAD 0x001040 0x00000040 0x00000040 0x2cbf8 0x2cbf8 RWE 0 + LOAD 0x02dc38 0x0002cc38 0x0002cc38 0x02208 0x02208 RWE 0 + LOAD 0x02fe40 0x0002ee40 0x0002ee40 0x00000 0x0a888 0 Section to Segment mapping: Segment Sections... $ diff -up \ <(readelf -l coreboot-builds/google_rambi/cbfs/fallback/romstage.elf) \ <(readelf -l coreboot-builds/google_rambi_gc_sections/cbfs/fallback/romstage.elf) --- /dev/fd/63 2015-03-10 12:08:16.855985880 -0500 +++ /dev/fd/62 2015-03-10 12:08:16.851985880 -0500 @@ -5,8 +5,8 @@ There are 1 program headers, starting at Program Headers: Type Offset VirtAddr PhysAddr FileSiz MemSiz Flg Align - LOAD 0x000060 0xfff20000 0xfff20000 0x08b81 0x08b81 R E 0x10 + LOAD 0x000060 0xfff20000 0xfff20000 0x06300 0x06300 R E 0x10 Section to Segment mapping: Segment Sections... - 00 .rom .text + 00 .rom The following warnings needed to be applied to CFLAGS_common because for some reason gcc was miraculously emitting the warnings with the unrelated *-sections options: -Wno-unused-but-set-variable Change-Id: I210784fdfc273ce4cb9927352cbd5a51be3c6929 Signed-off-by: Aaron Durbin Reviewed-on: http://review.coreboot.org/8635 Tested-by: build bot (Jenkins) Reviewed-by: Patrick Georgi Reviewed-by: Paul Menzel --- src/arch/x86/init/romstage.ld | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) (limited to 'src/arch/x86/init') diff --git a/src/arch/x86/init/romstage.ld b/src/arch/x86/init/romstage.ld index 50eb4ab222..95b9571e37 100644 --- a/src/arch/x86/init/romstage.ld +++ b/src/arch/x86/init/romstage.ld @@ -30,13 +30,16 @@ SECTIONS .rom . : { _rom = .; *(.rom.text); + *(.rom.text.*); + *(.text); + *(.text.*); *(.rom.data); *(.rodata); *(.rodata.*); *(.rom.data.*); . = ALIGN(16); _car_migrate_start = .; - *(.car.migrate); + KEEP(*(.car.migrate)); LONG(0); _car_migrate_end = .; . = ALIGN(16); @@ -73,7 +76,7 @@ SECTIONS . = 0xffffff00; .illegal_globals . : { *(EXCLUDE_FILE (*/libagesa.*.a: */buildOpts.romstage.o */agesawrapper.romstage.o */vendorcode/amd/agesa/* */vendorcode/amd/cimx/*) .data) - *(.data.*) + *(EXCLUDE_FILE (*/libagesa.*.a: */buildOpts.romstage.o */agesawrapper.romstage.o */vendorcode/amd/agesa/* */vendorcode/amd/cimx/*) .data.*) *(.bss) *(.bss.*) *(.sbss) -- cgit v1.2.3