aboutsummaryrefslogtreecommitdiff
diff options
context:
space:
mode:
-rw-r--r--arch/x86/config.mk7
-rw-r--r--arch/x86/lib/Makefile6
-rw-r--r--arch/x86/lib/gcc.c38
3 files changed, 51 insertions, 0 deletions
diff --git a/arch/x86/config.mk b/arch/x86/config.mk
index fe9083f62..23cacffde 100644
--- a/arch/x86/config.mk
+++ b/arch/x86/config.mk
@@ -41,3 +41,10 @@ PLATFORM_RELFLAGS += -ffunction-sections -fvisibility=hidden
PLATFORM_LDFLAGS += --emit-relocs -Bsymbolic -Bsymbolic-functions
LDFLAGS_FINAL += --gc-sections -pie
+LDFLAGS_FINAL += --wrap=__divdi3 --wrap=__udivdi3
+LDFLAGS_FINAL += --wrap=__moddi3 --wrap=__umoddi3
+
+NORMAL_LIBGCC = $(shell $(CC) $(CFLAGS) -print-libgcc-file-name)
+PREFIXED_LIBGCC = $(OBJTREE)/arch/$(ARCH)/lib/$(shell basename $(NORMAL_LIBGCC))
+
+export USE_PRIVATE_LIBGCC=$(shell dirname $(PREFIXED_LIBGCC))
diff --git a/arch/x86/lib/Makefile b/arch/x86/lib/Makefile
index 90f328333..d584aa4a8 100644
--- a/arch/x86/lib/Makefile
+++ b/arch/x86/lib/Makefile
@@ -32,6 +32,7 @@ SOBJS-$(CONFIG_SYS_X86_REALMODE) += realmode_switch.o
COBJS-$(CONFIG_SYS_PC_BIOS) += bios_setup.o
COBJS-y += board.o
COBJS-y += bootm.o
+COBJS-y += gcc.o
COBJS-y += interrupts.o
COBJS-$(CONFIG_SYS_PCAT_INTERRUPTS) += pcat_interrupts.o
COBJS-$(CONFIG_SYS_GENERIC_TIMER) += pcat_timer.o
@@ -50,6 +51,11 @@ OBJS := $(addprefix $(obj),$(SOBJS-y) $(COBJS-y))
$(LIB): $(obj).depend $(OBJS)
$(call cmd_link_o_target, $(OBJS))
+$(PREFIXED_LIBGCC): $(NORMAL_LIBGCC)
+ $(OBJCOPY) $< $@ --prefix-symbols=__normal_
+
+$(LIB): $(PREFIXED_LIBGCC)
+
#########################################################################
# defines $(obj).depend target
diff --git a/arch/x86/lib/gcc.c b/arch/x86/lib/gcc.c
new file mode 100644
index 000000000..4043431ec
--- /dev/null
+++ b/arch/x86/lib/gcc.c
@@ -0,0 +1,38 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2009 coresystems GmbH
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 or later of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA, 02110-1301 USA
+ */
+
+#ifdef __GNUC__
+
+/*
+ * GCC's libgcc handling is quite broken. While the libgcc functions
+ * are always regparm(0) the code that calls them uses whatever the
+ * compiler call specifies. Therefore we need a wrapper around those
+ * functions. See gcc bug PR41055 for more information.
+ */
+#define WRAP_LIBGCC_CALL(type, name) \
+ type __normal_##name(type a, type b) __attribute__((regparm(0))); \
+ type __wrap_##name(type a, type b); \
+ type __wrap_##name(type a, type b) { return __normal_##name(a, b); }
+
+WRAP_LIBGCC_CALL(long long, __divdi3)
+WRAP_LIBGCC_CALL(unsigned long long, __udivdi3)
+WRAP_LIBGCC_CALL(long long, __moddi3)
+WRAP_LIBGCC_CALL(unsigned long long, __umoddi3)
+
+#endif