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https://github.com/brain-hackers/u-boot-brain
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Previously, standalone applications were compiled with gcc flags that produced relocatable executables on the PowerPC architecture (eg with the -mrelocatable and -fPIC flags). There's no reason for these applications to be fully relocatable at this time since no relocation fixups are performed on standalone applications. Additionally, removing the gcc relocation flags results in the entry point of applications residing at the base of the image. When a standalone application was relocatable, the entry point was generally located at an offset into the image which was confusing and prone to errors. This change moves the entry point of PowerPC standalone applications from 0x40004 (usually) to 0x40000. Signed-off-by: Peter Tyser <ptyser@xes-inc.com> Signed-off-by: Wolfgang Denk <wd@denx.de>
113 lines
3.4 KiB
Makefile
113 lines
3.4 KiB
Makefile
#
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# (C) Copyright 2000-2006
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# Wolfgang Denk, DENX Software Engineering, wd@denx.de.
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#
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# See file CREDITS for list of people who contributed to this
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# project.
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#
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# This program is free software; you can redistribute it and/or
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# modify it under the terms of the GNU General Public License as
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# published by the Free Software Foundation; either version 2 of
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# the License, or (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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# MA 02111-1307 USA
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#
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include $(TOPDIR)/config.mk
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ELF-$(ARCH) :=
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ELF-$(BOARD) :=
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ELF-$(CPU) :=
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ELF-y := hello_world
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ELF-$(CONFIG_SMC91111) += smc91111_eeprom
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ELF-$(CONFIG_SMC911X) += smc911x_eeprom
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ELF-$(CONFIG_SPI_FLASH_ATMEL) += atmel_df_pow2
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ELF-i386 += 82559_eeprom
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ELF-mpc5xxx += interrupt
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ELF-mpc8xx += test_burst timer
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ELF-mpc8260 += mem_to_mem_idma2intr
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ELF-ppc += sched
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ELF-oxc += eepro100_eeprom
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#
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# Some versions of make do not handle trailing white spaces properly;
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# leading to build failures. The problem was found with GNU Make 3.80.
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# Using 'strip' as a workaround for the problem.
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#
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ELF := $(strip $(ELF-y) $(ELF-$(ARCH)) $(ELF-$(BOARD)) $(ELF-$(CPU)))
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SREC = $(addsuffix .srec,$(ELF))
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BIN = $(addsuffix .bin,$(ELF))
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COBJS := $(ELF:=.o)
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LIB = $(obj)libstubs.a
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LIBAOBJS-$(ARCH) :=
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LIBAOBJS-$(CPU) :=
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LIBAOBJS-ppc += $(ARCH)_longjmp.o $(ARCH)_setjmp.o
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LIBAOBJS-mpc8xx += test_burst_lib.o
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LIBAOBJS := $(LIBAOBJS-$(ARCH)) $(LIBAOBJS-$(CPU))
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LIBCOBJS = stubs.o
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LIBOBJS = $(addprefix $(obj),$(LIBAOBJS) $(LIBCOBJS))
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SRCS := $(COBJS:.o=.c) $(LIBCOBJS:.o=.c) $(LIBAOBJS:.o=.S)
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OBJS := $(addprefix $(obj),$(COBJS))
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ELF := $(addprefix $(obj),$(ELF))
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BIN := $(addprefix $(obj),$(BIN))
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SREC := $(addprefix $(obj),$(SREC))
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gcclibdir := $(shell dirname `$(CC) -print-libgcc-file-name`)
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CPPFLAGS += -I..
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# For PowerPC there's no need to compile standalone applications as a
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# relocatable executable. The relocation data is not needed, and
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# also causes the entry point of the standalone application to be
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# inconsistent.
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ifeq ($(ARCH),powerpc)
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AFLAGS := $(filter-out $(RELFLAGS),$(AFLAGS))
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CFLAGS := $(filter-out $(RELFLAGS),$(CFLAGS))
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CPPFLAGS := $(filter-out $(RELFLAGS),$(CPPFLAGS))
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endif
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all: $(obj).depend $(OBJS) $(LIB) $(SREC) $(BIN) $(ELF)
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#########################################################################
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$(LIB): $(obj).depend $(LIBOBJS)
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$(AR) $(ARFLAGS) $@ $(LIBOBJS)
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$(ELF):
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$(obj)%: $(obj)%.o $(LIB)
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$(LD) -g -Ttext $(STANDALONE_LOAD_ADDR) \
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-o $@ -e $(SYM_PREFIX)$(notdir $(<:.o=)) $< $(LIB) \
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-L$(gcclibdir) -lgcc
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$(SREC):
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$(obj)%.srec: $(obj)%
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$(OBJCOPY) -O srec $< $@ 2>/dev/null
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$(BIN):
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$(obj)%.bin: $(obj)%
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$(OBJCOPY) -O binary $< $@ 2>/dev/null
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#########################################################################
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# defines $(obj).depend target
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include $(SRCTREE)/rules.mk
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sinclude $(obj).depend
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#########################################################################
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