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build system: Eliminate special case for c_start 

c_start.o has a special case in the build system, which we can
eliminate, somewhat simplifying the build.

To ensure that the entry point is at the beginning, introduce a
new section .textfirst that is placed appropriately. In principle
the ENTRY() definition in the linker script should be enough, but
better be safe.

Change-Id: I9737f7f5731e12ceb2119eb432b0e09832bc53fa
Signed-off-by: Patrick Georgi <patrick@georgi-clan.de>
Reviewed-on: http://review.coreboot.org/1909
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
This commit is contained in:
Patrick Georgi 2012-11-25 17:31:25 +01:00
parent 23f38cd05c
commit 6999217ab6
3 changed files with 5 additions and 4 deletions
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6
src/arch/x86/Makefile.inc
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@ -161,12 +161,12 @@ else
$(CC) -nostdlib -nostartfiles -static -o $@ -L$(obj) -T $(src)/arch/x86/coreboot_ram.ld $<
endif
$(objgenerated)/coreboot_ram.o: $(obj)/arch/x86/lib/c_start.ramstage.o $$(ramstage-objs) $(LIBGCC_FILE_NAME)
$(objgenerated)/coreboot_ram.o: $$(ramstage-objs) $(LIBGCC_FILE_NAME)
@printf " CC $(subst $(obj)/,,$(@))\n"
ifeq ($(CONFIG_COMPILER_LLVM_CLANG),y)
$(LD) -m elf_i386 -r -o $@ $(obj)/arch/x86/lib/c_start.ramstage.o --wrap __divdi3 --wrap __udivdi3 --wrap __moddi3 --wrap __umoddi3 --start-group $(filter-out $(obj)/arch/x86/lib/c_start.ramstage.o,$(ramstage-objs)) $(LIBGCC_FILE_NAME) --end-group
$(LD) -m elf_i386 -r -o $@ --wrap __divdi3 --wrap __udivdi3 --wrap __moddi3 --wrap __umoddi3 --start-group $(ramstage-objs) $(LIBGCC_FILE_NAME) --end-group
else
$(CC) -nostdlib -r -o $@ $(obj)/arch/x86/lib/c_start.ramstage.o -Wl,--wrap,__divdi3 -Wl,--wrap,__udivdi3 -Wl,--wrap,__moddi3 -Wl,--wrap,__umoddi3 -Wl,--start-group $(filter-out $(obj)/arch/x86/lib/c_start.ramstage.o,$(ramstage-objs)) $(LIBGCC_FILE_NAME) -Wl,--end-group
$(CC) -nostdlib -r -o $@ -Wl,--wrap,__divdi3 -Wl,--wrap,__udivdi3 -Wl,--wrap,__moddi3 -Wl,--wrap,__umoddi3 -Wl,--start-group $(ramstage-objs) $(LIBGCC_FILE_NAME) -Wl,--end-group
endif
################################################################################

1
src/arch/x86/coreboot_ram.ld
View File

@ -32,6 +32,7 @@ SECTIONS
*/
.text : {
_text = .;
*(.textfirst);
*(.text);
*(.text.*);
. = ALIGN(16);

2
src/arch/x86/lib/c_start.S
View File

@ -1,6 +1,6 @@
#include <cpu/x86/post_code.h>
.section ".text"
.section ".textfirst"
.code32
.globl _start
_start: