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authorJulius Werner <jwerner@chromium.org>2013-10-15 17:36:17 -0700
committerIsaac Christensen <isaac.christensen@se-eng.com>2014-09-22 18:41:54 +0200
commitc505837e67aa4fb89964c849d905fa8d44459152 (patch)
treef7e18fbcb50e54509c3a2a6365cf9a3365dfde67 /src/arch/arm
parent08539b3b986a1eb564815f72897b448e2bd69b5b (diff)
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arm: Have the linker garbage-collect unused functions and variables
This patch activates -ffunction-sections and -fdata-sections for the compiler and --gc-sections for the linker. This will strip out all unused functions and static/global variables from the final binaries and reduce the amount of data we need to read over SPI. A quick test with ToT images shows a 2.5k (13%) / 10k (29%) / 12k (28%) reduction on Nyan and 3k (38%) / 23k (50%) / 13k (29%) on Pit, respectively for bootblock / romstage / ramstage. Change-Id: I052411d4ad190d0395921ac4d4677341fb91568a Signed-off-by: Julius Werner <jwerner@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/177111 (cherry picked from commit 5635b138778dea67a5f179e13003132be07f7e59) Signed-off-by: Isaac Christensen <isaac.christensen@se-eng.com> Reviewed-on: http://review.coreboot.org/6904 Tested-by: build bot (Jenkins) Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
Diffstat (limited to 'src/arch/arm')
-rw-r--r--src/arch/arm/Makefile.inc12
-rw-r--r--src/arch/arm/bootblock.ld22
-rw-r--r--src/arch/arm/ramstage.ld20
-rw-r--r--src/arch/arm/romstage.ld12
4 files changed, 35 insertions, 31 deletions
diff --git a/src/arch/arm/Makefile.inc b/src/arch/arm/Makefile.inc
index 027fbe141..0c1cfc61e 100644
--- a/src/arch/arm/Makefile.inc
+++ b/src/arch/arm/Makefile.inc
@@ -62,9 +62,9 @@ bootblock-y += memmove.S
$(objcbfs)/bootblock.debug: $(src)/arch/arm/bootblock.ld $(obj)/ldoptions $$(bootblock-objs)
@printf " LINK $(subst $(obj)/,,$(@))\n"
ifeq ($(CONFIG_COMPILER_LLVM_CLANG),y)
- $(LD_bootblock) -m armelf_linux_eabi -static -o $@ -L$(obj) $< -T $(src)/arch/arm/bootblock.ld
+ $(LD_bootblock) -m armelf_linux_eabi --gc-sections -static -o $@ -L$(obj) $< -T $(src)/arch/arm/bootblock.ld
else
- $(CC_bootblock) $(CFLAGS_bootblock) -nostartfiles -static -o $@ -L$(obj) -T $(src)/arch/arm/bootblock.ld -Wl,--start-group $(bootblock-objs) $(LIBGCC_FILE_NAME_bootblock) -Wl,--end-group
+ $(CC_bootblock) $(CFLAGS_bootblock) -nostartfiles -Wl,--gc-sections -static -o $@ -L$(obj) -T $(src)/arch/arm/bootblock.ld -Wl,--start-group $(bootblock-objs) $(LIBGCC_FILE_NAME_bootblock) -Wl,--end-group
endif
endif # CONFIG_ARCH_BOOTBLOCK_ARM
@@ -87,9 +87,9 @@ VBOOT_STUB_DEPS += $(obj)/arch/arm/eabi_compat.rmodules_arm.o
$(objcbfs)/romstage.debug: $$(romstage-objs) $(src)/arch/arm/romstage.ld $(obj)/ldoptions
@printf " LINK $(subst $(obj)/,,$(@))\n"
ifeq ($(CONFIG_COMPILER_LLVM_CLANG),y)
- $(LD_romstage) -nostdlib -nostartfiles -static -o $@ -L$(obj) $(romstage-objs) -T $(src)/arch/arm/romstage.ld
+ $(LD_romstage) -nostdlib -nostartfiles --gc-sections -static -o $@ -L$(obj) $(romstage-objs) -T $(src)/arch/arm/romstage.ld
else
- $(CC_romstage) $(CFLAGS_romstage) -nostartfiles -static -o $@ -L$(obj) -T $(src)/arch/arm/romstage.ld -Wl,--start-group $(romstage-objs) $(LIBGCC_FILE_NAME_romstage) -Wl,--end-group
+ $(CC_romstage) $(CFLAGS_romstage) -nostartfiles -Wl,--gc-sections -static -o $@ -L$(obj) -T $(src)/arch/arm/romstage.ld -Wl,--start-group $(romstage-objs) $(LIBGCC_FILE_NAME_romstage) -Wl,--end-group
endif
endif # CONFIG_ARCH_ROMSTAGE_ARM
@@ -122,9 +122,9 @@ endif
$(objgenerated)/ramstage.o: $(stages_o) $$(ramstage-objs) $(LIBGCC_FILE_NAME_ramstage)
@printf " CC $(subst $(obj)/,,$(@))\n"
ifeq ($(CONFIG_COMPILER_LLVM_CLANG),y)
- $(LD_ramstage) -m -m armelf_linux_eabi -r -o $@ --wrap __divdi3 --wrap __udivdi3 --wrap __moddi3 --wrap __umoddi3 --wrap __uidiv --start-group $(ramstage-objs) $(LIBGCC_FILE_NAME_ramstage) --end-group
+ $(LD_ramstage) -m -m armelf_linux_eabi --gc-sections -r -o $@ --wrap __divdi3 --wrap __udivdi3 --wrap __moddi3 --wrap __umoddi3 --wrap __uidiv --start-group $(ramstage-objs) $(LIBGCC_FILE_NAME_ramstage) --end-group
else
- $(CC_ramstage) $(CFLAGS_ramstage) $(CPPFLAGS_ramstage) -nostdlib -r -o $@ -Wl,--start-group $(stages_o) $(ramstage-objs) $(LIBGCC_FILE_NAME_ramstage) -Wl,--end-group
+ $(CC_ramstage) $(CFLAGS_ramstage) $(CPPFLAGS_ramstage) -nostdlib -Wl,--gc-sections -r -o $@ -Wl,--start-group $(stages_o) $(ramstage-objs) $(LIBGCC_FILE_NAME_ramstage) -Wl,--end-group
endif
endif # CONFIG_ARCH_RAMSTAGE_ARM
diff --git a/src/arch/arm/bootblock.ld b/src/arch/arm/bootblock.ld
index 706f0a2c2..2b04b2247 100644
--- a/src/arch/arm/bootblock.ld
+++ b/src/arch/arm/bootblock.ld
@@ -28,23 +28,25 @@ PHDRS
to_load PT_LOAD;
}
+ENTRY(_start)
TARGET(binary)
SECTIONS
{
- ROMLOC = CONFIG_BOOTBLOCK_BASE;
+ . = CONFIG_BOOTBLOCK_BASE;
- /* This section might be better named .setup */
- .rom ROMLOC : {
- _rom = .;
+ .bootblock . : {
*(.start);
- *(.id);
+ KEEP(*(.id));
*(.text);
*(.text.*);
- *(.rom.text);
- *(.rom.data);
- *(.rom.data.*);
+ *(.rodata);
*(.rodata.*);
- _erom = .;
+ *(.data);
+ *(.data.*);
+ *(.bss);
+ *(.bss.*);
+ *(.sbss);
+ *(.sbss.*);
} : to_load = 0xff
/DISCARD/ : {
@@ -54,4 +56,4 @@ SECTIONS
*(.note.*)
*(.ARM.*)
}
-}
+} \ No newline at end of file
diff --git a/src/arch/arm/ramstage.ld b/src/arch/arm/ramstage.ld
index cab512e99..5469509b8 100644
--- a/src/arch/arm/ramstage.ld
+++ b/src/arch/arm/ramstage.ld
@@ -48,7 +48,7 @@ SECTIONS
.ctors : {
. = ALIGN(0x100);
__CTOR_LIST__ = .;
- *(.ctors);
+ KEEP(*(.ctors));
LONG(0);
__CTOR_END__ = .;
}
@@ -57,13 +57,13 @@ SECTIONS
_rodata = .;
. = ALIGN(4);
pci_drivers = . ;
- *(.rodata.pci_driver)
+ KEEP(*(.rodata.pci_driver));
epci_drivers = . ;
cpu_drivers = . ;
- *(.rodata.cpu_driver)
+ KEEP(*(.rodata.cpu_driver));
ecpu_drivers = . ;
_bs_init_begin = .;
- *(.bs_init)
+ KEEP(*(.bs_init));
_bs_init_end = .;
*(.rodata)
*(.rodata.*)
@@ -83,6 +83,7 @@ SECTIONS
.data : {
_data = .;
*(.data)
+ *(.data.*)
_edata = .;
}
@@ -90,26 +91,27 @@ SECTIONS
* initialized on startup. (typically uninitialized global variables)
* crt0.S fills between _bss and _ebss with zeroes.
*/
- _bss = .;
.bss . : {
+ _bss = .;
*(.bss)
+ *(.bss.*)
*(.sbss)
- *(COMMON)
+ *(.sbss.*)
+ _ebss = .;
}
- _ebss = .;
_end = .;
/* coreboot really "ends" here. Only heap and stack are placed after
* this line.
*/
- _heap = .;
.heap . : {
+ _heap = .;
/* Reserve CONFIG_HEAP_SIZE bytes for the heap */
. = CONFIG_HEAP_SIZE ;
. = ALIGN(4);
+ _eheap = .;
}
- _eheap = .;
/* The ram segment. This includes all memory used by the memory
* resident copy of coreboot, except the tables that are produced on
diff --git a/src/arch/arm/romstage.ld b/src/arch/arm/romstage.ld
index 750525bad..04d8f4b33 100644
--- a/src/arch/arm/romstage.ld
+++ b/src/arch/arm/romstage.ld
@@ -38,19 +38,19 @@ SECTIONS
. = CONFIG_ROMSTAGE_BASE;
.romtext . : {
- _rom = .;
_start = .;
*(.text.stage_entry.arm);
*(.text.startup);
*(.text);
+ *(.text.*);
} : to_load
.romdata . : {
*(.rodata);
- *(.machine_param);
+ *(.rodata.*);
*(.data);
+ *(.data.*);
. = ALIGN(8);
- _erom = .;
}
/* bss does not contain data, it is just a space that should be zero
@@ -61,12 +61,12 @@ SECTIONS
. = ALIGN(8);
_bss = .;
*(.bss)
+ *(.bss.*)
*(.sbss)
- *(COMMON)
+ *(.sbss.*)
+ _ebss = .;
}
- _ebss = .;
-
_end = .;
/* Discard the sections we don't need/want */