Absolute calls from initram were only working from the file which had
_MAINOBJECT #defined. Calls from all other files ended up in nirvana
because the compiler was not able to calculate the address of the
wrapper for the absolute call. The linker tried, but failed miserably.
Use the -combine flag and compile all of initram at once. This enables
GCC to calculate the address of the abscall wrapper, resulting in
working code.
Segher Boessenkool thinks the patched code works only by accident
because GCC has no way to specify generation of XIP code. According to
him, future GCC versions or other circumstances may break the code.
While this patch makes code work for now, it does NOT check whether the
generated code tries to write to memory outside the stack (general
writable data). That will of course fail, but I hope porters are smart
enough to avoid that.
Signed-off-by: Carl-Daniel Hailfinger <[EMAIL PROTECTED]>
Index: LinuxBIOSv3-xiptest-working/mainboard/adl/msm800sev/Makefile
===================================================================
--- LinuxBIOSv3-xiptest-working/mainboard/adl/msm800sev/Makefile
(revision 535)
+++ LinuxBIOSv3-xiptest-working/mainboard/adl/msm800sev/Makefile
(working copy)
@@ -21,10 +21,10 @@
STAGE0_MAINBOARD_OBJ := $(obj)/mainboard/$(MAINBOARDDIR)/stage1.o
-INITRAM_OBJ = $(obj)/mainboard/$(MAINBOARDDIR)/initram.o \
- $(obj)/northbridge/amd/geodelx/raminit.o \
- $(obj)/southbridge/amd/cs5536/smbus_initram.o \
- $(obj)/arch/x86/geodelx/geodelx.o
+INITRAM_OBJ = $(src)/mainboard/$(MAINBOARDDIR)/initram.c \
+ $(src)/northbridge/amd/geodelx/raminit.c \
+ $(src)/southbridge/amd/cs5536/smbus_initram.c \
+ $(src)/arch/x86/geodelx/geodelx.c
STAGE2_MAINBOARD_OBJ =
Index: LinuxBIOSv3-xiptest-working/mainboard/amd/norwich/Makefile
===================================================================
--- LinuxBIOSv3-xiptest-working/mainboard/amd/norwich/Makefile (revision 535)
+++ LinuxBIOSv3-xiptest-working/mainboard/amd/norwich/Makefile (working copy)
@@ -21,10 +21,10 @@
STAGE0_MAINBOARD_OBJ := $(obj)/mainboard/$(MAINBOARDDIR)/stage1.o
-INITRAM_OBJ = $(obj)/mainboard/$(MAINBOARDDIR)/initram.o \
- $(obj)/northbridge/amd/geodelx/raminit.o \
- $(obj)/southbridge/amd/cs5536/smbus_initram.o \
- $(obj)/arch/x86/geodelx/geodelx.o
+INITRAM_OBJ = $(src)/mainboard/$(MAINBOARDDIR)/initram.c \
+ $(src)/northbridge/amd/geodelx/raminit.c \
+ $(src)/southbridge/amd/cs5536/smbus_initram.c \
+ $(src)/arch/x86/geodelx/geodelx.c
STAGE2_MAINBOARD_OBJ =
Index: LinuxBIOSv3-xiptest-working/mainboard/artecgroup/dbe61/Makefile
===================================================================
--- LinuxBIOSv3-xiptest-working/mainboard/artecgroup/dbe61/Makefile
(revision 535)
+++ LinuxBIOSv3-xiptest-working/mainboard/artecgroup/dbe61/Makefile
(working copy)
@@ -21,8 +21,8 @@
STAGE0_MAINBOARD_OBJ := $(obj)/mainboard/$(MAINBOARDDIR)/stage1.o
-INITRAM_OBJ = $(obj)/mainboard/$(MAINBOARDDIR)/initram.o \
- $(obj)/arch/x86/geodelx/geodelx.o
+INITRAM_OBJ = $(src)/mainboard/$(MAINBOARDDIR)/initram.c \
+ $(src)/arch/x86/geodelx/geodelx.c
STAGE2_MAINBOARD_OBJ =
Index: LinuxBIOSv3-xiptest-working/mainboard/pcengines/alix1c/Makefile
===================================================================
--- LinuxBIOSv3-xiptest-working/mainboard/pcengines/alix1c/Makefile
(revision 535)
+++ LinuxBIOSv3-xiptest-working/mainboard/pcengines/alix1c/Makefile
(working copy)
@@ -21,9 +21,9 @@
STAGE0_MAINBOARD_OBJ := $(obj)/mainboard/$(MAINBOARDDIR)/stage1.o
-INITRAM_OBJ = $(obj)/mainboard/$(MAINBOARDDIR)/initram.o \
- $(obj)/northbridge/amd/geodelx/raminit.o \
- $(obj)/arch/x86/geodelx/geodelx.o
+INITRAM_OBJ = $(src)/mainboard/$(MAINBOARDDIR)/initram.c \
+ $(src)/northbridge/amd/geodelx/raminit.c \
+ $(src)/arch/x86/geodelx/geodelx.c
STAGE2_MAINBOARD_OBJ =
Index: LinuxBIOSv3-xiptest-working/mainboard/emulation/qemu-x86/Makefile
===================================================================
--- LinuxBIOSv3-xiptest-working/mainboard/emulation/qemu-x86/Makefile
(revision 535)
+++ LinuxBIOSv3-xiptest-working/mainboard/emulation/qemu-x86/Makefile
(working copy)
@@ -28,8 +28,8 @@
# directory and is built from what was auto.c in v2.
#
-INITRAM_OBJ = $(obj)/mainboard/$(MAINBOARDDIR)/initram.o \
- $(obj)/mainboard/$(MAINBOARDDIR)/initram_printktest.o
+INITRAM_OBJ = $(src)/mainboard/$(MAINBOARDDIR)/initram.c \
+ $(src)/mainboard/$(MAINBOARDDIR)/initram_printktest.c
STAGE2_MAINBOARD_OBJ = vga.o
Index: LinuxBIOSv3-xiptest-working/Rules.make
===================================================================
--- LinuxBIOSv3-xiptest-working/Rules.make (revision 535)
+++ LinuxBIOSv3-xiptest-working/Rules.make (working copy)
@@ -78,13 +78,3 @@
$(Q)printf " CC $(subst $(shell pwd)/,,$(@))\n"
$(Q)$(CC) $(INITCFLAGS) -c $< -o $@
-#
-# RAM initialization code can not be linked at a specific address,
-# hence it has to be executed in place (XIP) position independently.
-#
-
-$(obj)/%_xip.o: $(src)/%.c
- $(Q)mkdir -p $(dir $@)
- $(Q)printf " CC $(subst $(shell pwd)/,,$(@)) (XIP)\n"
- $(Q)$(CC) $(INITCFLAGS) -D_SHARED -fPIE -c $< -o $@
-
Index: LinuxBIOSv3-xiptest-working/arch/x86/stage1.c
===================================================================
--- LinuxBIOSv3-xiptest-working/arch/x86/stage1.c (revision 535)
+++ LinuxBIOSv3-xiptest-working/arch/x86/stage1.c (working copy)
@@ -137,17 +137,17 @@
// find first initram
if (check_normal_boot_flag()) {
printk(BIOS_DEBUG, "Choosing normal boot.\n");
- ret = execute_in_place(&archive, "normal/initram.o/segment0");
+ ret = execute_in_place(&archive, "normal/initram/segment0");
} else {
printk(BIOS_DEBUG, "Choosing fallback boot.\n");
- ret = execute_in_place(&archive, "fallback/initram.o/segment0");
+ ret = execute_in_place(&archive, "fallback/initram/segment0");
/* Try a normal boot if fallback doesn't exist in the lar.
* TODO: There are other ways to do this.
* It could be ifdef or the boot flag could be forced.
*/
if (ret) {
printk(BIOS_DEBUG, "Fallback failed. Try normal
boot\n");
- ret = execute_in_place(&archive,
"normal/initram.o/segment0");
+ ret = execute_in_place(&archive,
"normal/initram/segment0");
}
}
Index: LinuxBIOSv3-xiptest-working/arch/x86/Makefile
===================================================================
--- LinuxBIOSv3-xiptest-working/arch/x86/Makefile (revision 535)
+++ LinuxBIOSv3-xiptest-working/arch/x86/Makefile (working copy)
@@ -36,7 +36,7 @@
ROM_SIZE := $(shell expr $(CONFIG_LINUXBIOS_ROMSIZE_KB) \* 1024)
-LARFILES := nocompress:normal/initram.o normal/stage2.o
nocompress:normal/option_table
+LARFILES := nocompress:normal/initram normal/stage2.o
nocompress:normal/option_table
ifneq ($(CONFIG_PAYLOAD_NONE),y)
LARFILES += normal/payload
endif
@@ -57,11 +57,11 @@
COMPRESSFLAG := -C nrv2b
endif
-$(obj)/linuxbios.rom $(obj)/linuxbios.map: $(obj)/linuxbios.bootblock
$(obj)/util/lar/lar lzma nrv2b $(obj)/linuxbios.initram.o
$(obj)/linuxbios.stage2.o $(obj)/option_table
+$(obj)/linuxbios.rom $(obj)/linuxbios.map: $(obj)/linuxbios.bootblock
$(obj)/util/lar/lar lzma nrv2b $(obj)/linuxbios.initram
$(obj)/linuxbios.stage2.o $(obj)/option_table
$(Q)rm -rf $(obj)/lar.tmp
$(Q)mkdir $(obj)/lar.tmp
$(Q)mkdir $(obj)/lar.tmp/normal
- $(Q)cp $(obj)/linuxbios.initram.o $(obj)/lar.tmp/normal/initram.o
+ $(Q)cp $(obj)/linuxbios.initram $(obj)/lar.tmp/normal/initram
$(Q)cp $(obj)/linuxbios.stage2.o $(obj)/lar.tmp/normal/stage2.o
$(Q)cp $(obj)/option_table $(obj)/lar.tmp/normal/option_table
ifeq ($(CONFIG_PAYLOAD_NONE),y)
@@ -232,12 +232,14 @@
$(Q)printf " AS $(subst $(shell pwd)/,,$(@))\n"
$(Q)$(AS) $(obj)/arch/x86/stage0_asm.s -o $@
-$(obj)/linuxbios.initram.o $(obj)/linuxbios.initram.map: $(obj)/stage0.init
$(obj)/stage0-prefixed.o $(patsubst %.o,%_xip.o,$(INITRAM_OBJ))
+$(obj)/linuxbios.initram $(obj)/linuxbios.initram.map: $(obj)/stage0.init
$(obj)/stage0-prefixed.o $(INITRAM_OBJ)
+ $(Q)printf " CC $(subst $(shell pwd)/,,$(@)) (XIP)\n"
+ $(Q)$(CC) $(INITCFLAGS) -D_SHARED -fPIE -c -combine $(INITRAM_OBJ) -o
$(obj)/linuxbios.initram_partiallylinked.o
$(Q)# initram links against stage0
$(Q)printf " LD $(subst $(shell pwd)/,,$(@))\n"
$(Q)$(LD) -Ttext 0 --entry main -N -R $(obj)/stage0-prefixed.o \
- $(patsubst %.o,%_xip.o,$(INITRAM_OBJ)) -o
$(obj)/linuxbios.initram.o
+ $(obj)/linuxbios.initram_partiallylinked.o -o
$(obj)/linuxbios.initram
$(Q)printf " NM $(subst $(shell pwd)/,,$(@))\n"
- $(Q)$(NM) $(obj)/linuxbios.initram.o | sort -u >
$(obj)/linuxbios.initram.map
+ $(Q)$(NM) $(obj)/linuxbios.initram | sort -u >
$(obj)/linuxbios.initram.map
endif
--
linuxbios mailing list
linuxbios@linuxbios.org
http://www.linuxbios.org/mailman/listinfo/linuxbios
