rmodules: use rmodtool to create rmodules

Start using the rmodtool for generating rmodules.
rmodule_link() has been changed to create 2 rules:
one for the passed in <name>, the other for creating
<name>.rmod which is an ELF file in the format of
an rmodule.

Since the header is not compiled and linked together
with an rmodule there needs to be a way of marking
which symbol is the entry point. __rmodule_entry is
the symbol used for knowing the entry point. There
was a little churn in SMM modules to ensure an
rmodule entry point symbol takes a single argument.

Change-Id: Ie452ed866f6596bf13f137f5b832faa39f48d26e
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: http://review.coreboot.org/5379
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Tested-by: build bot (Jenkins)

25 files changed, 121 insertions, 261 deletions

diff --git a/Makefile.inc b/Makefile.inc
index 19ba294000..fcd680df2b 100644
--- a/Makefile.inc
+++ b/Makefile.inc
@@ -252,10 +252,14 @@ build-dirs:
 #######################################################################
 # Build the tools
 CBFSTOOL:=$(obj)/cbfstool
+RMODTOOL:=$(obj)/rmodtool
 
 $(CBFSTOOL): $(objutil)/cbfstool/cbfstool
 	cp $< $@
 
+$(RMODTOOL): $(objutil)/cbfstool/rmodtool
+	cp $< $@
+
 _WINCHECK=$(shell uname -o 2> /dev/null)
 STACK=
 ifeq ($(_WINCHECK),Msys)
@@ -390,5 +394,5 @@ crosstools-arm: clean-for-update
 crossgcc-clean: clean-for-update
 	$(MAKE) -C util/crossgcc clean
 
-tools: $(objutil)/kconfig/conf $(objutil)/cbfstool/cbfstool $(objutil)/nvramtool/nvramtool $(objutil)/romcc/romcc $(objutil)/sconfig/sconfig
+tools: $(objutil)/kconfig/conf $(objutil)/cbfstool/cbfstool $(objutil)/cbfstool/rmodtool $(objutil)/nvramtool/nvramtool $(objutil)/romcc/romcc $(objutil)/sconfig/sconfig
 
diff --git a/src/arch/x86/Makefile.inc b/src/arch/x86/Makefile.inc
index 4b2869738c..acb4e98e63 100644
--- a/src/arch/x86/Makefile.inc
+++ b/src/arch/x86/Makefile.inc
@@ -93,7 +93,13 @@ ifneq ($(strip $(call strip_quotes,$(CONFIG_LINUX_INITRD))),)
 endif
 endif
 
-$(obj)/coreboot.rom: $(obj)/coreboot.pre $(objcbfs)/coreboot_ram.elf $(CBFSTOOL) $(call strip_quotes,$(COREBOOT_ROM_DEPENDENCIES)) $$(INTERMEDIATE) $$(VBOOT_STUB_ELF)
+ifeq ($(CONFIG_HAVE_REFCODE_BLOB),y)
+REFCODE_BLOB=$(obj)/refcode.rmod
+$(REFCODE_BLOB): $(RMODTOOL)
+	$(RMODTOOL) -i $(CONFIG_REFCODE_BLOB_FILE) -o $@
+endif
+
+$(obj)/coreboot.rom: $(obj)/coreboot.pre $(objcbfs)/coreboot_ram.elf $(CBFSTOOL) $(call strip_quotes,$(COREBOOT_ROM_DEPENDENCIES)) $$(INTERMEDIATE) $$(VBOOT_STUB) $(REFCODE_BLOB)
 	@printf "    CBFS       $(subst $(obj)/,,$(@))\n"
 	cp $(obj)/coreboot.pre $@.tmp
 	$(CBFSTOOL) $@.tmp add-stage -f $(objcbfs)/coreboot_ram.elf -n $(CONFIG_CBFS_PREFIX)/coreboot_ram -c $(CBFS_COMPRESS_FLAG)
@@ -140,7 +146,7 @@ ifeq ($(CONFIG_INCLUDE_CONFIG_FILE),y)
 	$(CBFSTOOL) $@.tmp add -f $(obj)/config.tmp -n config -t raw; rm -f $(obj)/config.tmp ; fi
 endif
 ifeq ($(CONFIG_VBOOT_VERIFY_FIRMWARE),y)
-	$(CBFSTOOL) $@.tmp add-stage -f $(VBOOT_STUB_ELF) -n $(CONFIG_CBFS_PREFIX)/vboot -c $(CBFS_COMPRESS_FLAG)
+	$(CBFSTOOL) $@.tmp add-stage -f $(VBOOT_STUB) -n $(CONFIG_CBFS_PREFIX)/vboot -c $(CBFS_COMPRESS_FLAG)
 endif
 ifeq ($(CONFIG_HAVE_REFCODE_BLOB),y)
 	$(CBFSTOOL) $@.tmp add-stage -f $(CONFIG_REFCODE_BLOB_FILE) -n $(CONFIG_CBFS_PREFIX)/refcode -c $(CBFS_COMPRESS_FLAG)
@@ -205,6 +211,10 @@ ifeq ($(CONFIG_RELOCATABLE_RAMSTAGE),y)
 
 $(eval $(call rmodule_link,$(objcbfs)/coreboot_ram.debug, $(objgenerated)/coreboot_ram.o, $(CONFIG_HEAP_SIZE)))
 
+# The rmodule_link defintion creates an elf file with .rmod extension.
+$(objcbfs)/coreboot_ram.elf: $(objcbfs)/coreboot_ram.debug.rmod
+	cp $< $@
+
 else
 
 $(objcbfs)/coreboot_ram.debug: $(objgenerated)/coreboot_ram.o $(src)/arch/x86/coreboot_ram.ld
diff --git a/src/arch/x86/boot/Makefile.inc b/src/arch/x86/boot/Makefile.inc
index 629c644c7c..79c64170b4 100644
--- a/src/arch/x86/boot/Makefile.inc
+++ b/src/arch/x86/boot/Makefile.inc
@@ -11,7 +11,6 @@ ramstage-$(CONFIG_GENERATE_ACPI_TABLES) += acpi.c
 ramstage-$(CONFIG_GENERATE_SMBIOS_TABLES) += smbios.c
 ramstage-$(CONFIG_GENERATE_ACPI_TABLES) += acpigen.c
 ramstage-$(CONFIG_HAVE_ACPI_RESUME) += wakeup.S
-ramstage-$(CONFIG_RELOCATABLE_RAMSTAGE) += ramstage_module_header.c
 
 $(obj)/arch/x86/boot/smbios.ramstage.o: $(obj)/build.h
 
diff --git a/src/arch/x86/boot/ramstage_module_header.c b/src/arch/x86/boot/ramstage_module_header.c
deleted file mode 100644
index b958c16085..0000000000
--- a/src/arch/x86/boot/ramstage_module_header.c
+++ /dev/null
@@ -1,24 +0,0 @@
-/*
- * This file is part of the coreboot project.
- *
- * Copyright (C) 2013 ChromeOS Authors
- *
- * 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 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
- */
-
-#include <rmodule.h>
-
-extern char _start[];
-
-DEFINE_RMODULE_HEADER(ramstage_module, _start, RMODULE_TYPE_STAGE);
diff --git a/src/arch/x86/lib/c_start.S b/src/arch/x86/lib/c_start.S
index 01ffa7c42c..faea22d6a6 100644
--- a/src/arch/x86/lib/c_start.S
+++ b/src/arch/x86/lib/c_start.S
@@ -19,6 +19,8 @@ thread_stacks:
 	.section ".textfirst", "ax", @progbits
 	.code32
 	.globl _start
+	.globl __rmodule_entry
+__rmodule_entry:
 _start:
 	cli
 	lgdt	%cs:gdtaddr
diff --git a/src/cpu/intel/haswell/Makefile.inc b/src/cpu/intel/haswell/Makefile.inc
index 60c061ddd7..63c1939537 100644
--- a/src/cpu/intel/haswell/Makefile.inc
+++ b/src/cpu/intel/haswell/Makefile.inc
@@ -25,12 +25,12 @@ ramstage-srcs += $(SIPI_BIN)
 rmodules-y += sipi_vector.S
 rmodules-y += sipi_header.c
 
-$(SIPI_DOTO): $(dir $(SIPI_ELF))sipi_vector.rmodules.o $(dir $(SIPI_ELF))sipi_header.rmodules.o
+$(SIPI_DOTO): $(dir $(SIPI_ELF))sipi_vector.rmodules.o
 	$(CC) $(LDFLAGS) -nostdlib -r -o $@ $^
 
-$(eval $(call rmodule_link,$(SIPI_ELF), $(SIPI_ELF:.elf=.o), 0))
+$(eval $(call rmodule_link,$(SIPI_ELF), $(SIPI_DOTO), 0))
 
-$(SIPI_BIN): $(SIPI_ELF)
+$(SIPI_BIN): $(SIPI_ELF).rmod
 	$(OBJCOPY) -O binary $< $@
 
 $(SIPI_BIN).ramstage.o: $(SIPI_BIN)
diff --git a/src/cpu/intel/haswell/sipi_header.c b/src/cpu/intel/haswell/sipi_header.c
deleted file mode 100644
index 846a82d7c2..0000000000
--- a/src/cpu/intel/haswell/sipi_header.c
+++ /dev/null
@@ -1,6 +0,0 @@
-#include <rmodule.h>
-
-
-extern void *ap_start;
-
-DEFINE_RMODULE_HEADER(sipi_vector_header, ap_start, RMODULE_TYPE_SIPI_VECTOR);
diff --git a/src/cpu/intel/haswell/sipi_vector.S b/src/cpu/intel/haswell/sipi_vector.S
index 664a9ee8ee..e0abb7c9b2 100644
--- a/src/cpu/intel/haswell/sipi_vector.S
+++ b/src/cpu/intel/haswell/sipi_vector.S
@@ -58,6 +58,8 @@ apic_to_cpu_num:
 .text
 .code16
 .global ap_start
+.global __rmodule_entry
+__rmodule_entry:
 ap_start:
 	cli
 	xorl	%eax, %eax
diff --git a/src/cpu/intel/haswell/smmrelocate.c b/src/cpu/intel/haswell/smmrelocate.c
index 3f4f45ab4f..dfbcf2e46b 100644
--- a/src/cpu/intel/haswell/smmrelocate.c
+++ b/src/cpu/intel/haswell/smmrelocate.c
@@ -164,11 +164,18 @@ static int bsp_setup_msr_save_state(struct smm_relocation_params *relo_params)
 /* The relocation work is actually performed in SMM context, but the code
  * resides in the ramstage module. This occurs by trampolining from the default
  * SMRAM entry point to here. */
-static void asmlinkage
-cpu_smm_do_relocation(void *arg, int cpu, const struct smm_runtime *runtime)
+static void asmlinkage cpu_smm_do_relocation(void *arg)
 {
 	msr_t mtrr_cap;
-	struct smm_relocation_params *relo_params = arg;
+	struct smm_relocation_params *relo_params;
+	const struct smm_module_params *p;
+	const struct smm_runtime *runtime;
+	int cpu;
+
+	p = arg;
+	runtime = p->runtime;
+	relo_params = p->arg;
+	cpu = p->cpu;
 
 	if (cpu >= CONFIG_MAX_CPUS) {
 		printk(BIOS_CRIT,
diff --git a/src/cpu/x86/Makefile.inc b/src/cpu/x86/Makefile.inc
index 277ba484a6..c0b50c59ae 100644
--- a/src/cpu/x86/Makefile.inc
+++ b/src/cpu/x86/Makefile.inc
@@ -6,6 +6,7 @@ ramstage-$(CONFIG_PARALLEL_MP) += mp_init.c
 ramstage-$(CONFIG_MIRROR_PAYLOAD_TO_RAM_BEFORE_LOADING) += mirror_payload.c
 
 SIPI_ELF=$(obj)/cpu/x86/sipi_vector.elf
+SIPI_RMOD=$(SIPI_ELF).rmod
 SIPI_BIN=$(SIPI_ELF:.elf=)
 SIPI_DOTO=$(SIPI_ELF:.elf=.o)
 
@@ -13,14 +14,13 @@ ifeq ($(CONFIG_PARALLEL_MP),y)
 ramstage-srcs += $(SIPI_BIN)
 endif
 rmodules-$(CONFIG_PARALLEL_MP) += sipi_vector.S
-rmodules-$(CONFIG_PARALLEL_MP) += sipi_header.c
 
-$(SIPI_DOTO): $(dir $(SIPI_ELF))sipi_vector.rmodules.o $(dir $(SIPI_ELF))sipi_header.rmodules.o
+$(SIPI_DOTO): $(dir $(SIPI_ELF))sipi_vector.rmodules.o
 	$(CC) $(LDFLAGS) -nostdlib -r -o $@ $^
 
 $(eval $(call rmodule_link,$(SIPI_ELF), $(SIPI_ELF:.elf=.o), 0))
 
-$(SIPI_BIN): $(SIPI_ELF)
+$(SIPI_BIN): $(SIPI_RMOD)
 	$(OBJCOPY) -O binary $< $@
 
 $(SIPI_BIN).ramstage.o: $(SIPI_BIN)
diff --git a/src/cpu/x86/sipi_header.c b/src/cpu/x86/sipi_header.c
deleted file mode 100644
index 846a82d7c2..0000000000
--- a/src/cpu/x86/sipi_header.c
+++ /dev/null
@@ -1,6 +0,0 @@
-#include <rmodule.h>
-
-
-extern void *ap_start;
-
-DEFINE_RMODULE_HEADER(sipi_vector_header, ap_start, RMODULE_TYPE_SIPI_VECTOR);
diff --git a/src/cpu/x86/sipi_vector.S b/src/cpu/x86/sipi_vector.S
index 52b12d0314..c08c3911df 100644
--- a/src/cpu/x86/sipi_vector.S
+++ b/src/cpu/x86/sipi_vector.S
@@ -58,6 +58,8 @@ ap_count:
 .text
 .code16
 .global ap_start
+.global __rmodule_entry
+__rmodule_entry:
 ap_start:
 	cli
 	xorl	%eax, %eax
diff --git a/src/cpu/x86/smm/Makefile.inc b/src/cpu/x86/smm/Makefile.inc
index 8dcd130117..bb9c11d83b 100644
--- a/src/cpu/x86/smm/Makefile.inc
+++ b/src/cpu/x86/smm/Makefile.inc
@@ -21,10 +21,8 @@ ramstage-$(CONFIG_BACKUP_DEFAULT_SMM_REGION) += backup_default_smm.c
 
 ifeq ($(CONFIG_SMM_MODULES),y)
 smmstub-y += smm_stub.S
-smmstub-y += smm_module_header.c
 
 smm-y += smiutil.c
-smm-y += smm_module_header.c
 smm-y += smm_module_handler.c
 
 ramstage-y += smm_module_loader.c
@@ -40,7 +38,7 @@ $(obj)/cpu/x86/smm/smmstub.o: $$(smmstub-objs)
 # Link the SMM stub module with a 0-byte heap.
 $(eval $(call rmodule_link,$(obj)/cpu/x86/smm/smmstub.elf, $(obj)/cpu/x86/smm/smmstub.o, 0))
 
-$(obj)/cpu/x86/smm/smmstub: $(obj)/cpu/x86/smm/smmstub.elf
+$(obj)/cpu/x86/smm/smmstub: $(obj)/cpu/x86/smm/smmstub.elf.rmod
 	$(OBJCOPY) -O binary $< $@
 
 $(obj)/cpu/x86/smm/smmstub.ramstage.o: $(obj)/cpu/x86/smm/smmstub
@@ -55,7 +53,7 @@ $(obj)/cpu/x86/smm/smm.o: $$(smm-objs) $(LIBGCC_FILE_NAME)
 
 $(eval $(call rmodule_link,$(obj)/cpu/x86/smm/smm.elf, $(obj)/cpu/x86/smm/smm.o, $(CONFIG_SMM_MODULE_HEAP_SIZE)))
 
-$(obj)/cpu/x86/smm/smm: $(obj)/cpu/x86/smm/smm.elf
+$(obj)/cpu/x86/smm/smm: $(obj)/cpu/x86/smm/smm.elf.rmod
 	$(OBJCOPY) -O binary $< $@
 
 $(obj)/cpu/x86/smm/smm.ramstage.o: $(obj)/cpu/x86/smm/smm
diff --git a/src/cpu/x86/smm/smm_module_handler.c b/src/cpu/x86/smm/smm_module_handler.c
index 444e3352c7..79863d8fef 100644
--- a/src/cpu/x86/smm/smm_module_handler.c
+++ b/src/cpu/x86/smm/smm_module_handler.c
@@ -20,6 +20,7 @@
 #include <arch/io.h>
 #include <console/console.h>
 #include <cpu/x86/smm.h>
+#include <rmodule.h>
 
 typedef enum { SMI_LOCKED, SMI_UNLOCKED } smi_semaphore;
 
@@ -113,8 +114,16 @@ void *smm_get_save_state(int cpu)
 	return base;
 }
 
-void smm_handler_start(void *arg, int cpu, const struct smm_runtime *runtime)
+void asmlinkage smm_handler_start(void *arg)
 {
+	const struct smm_module_params *p;
+	const struct smm_runtime *runtime;
+	int cpu;
+
+	p = arg;
+	runtime = p->runtime;
+	cpu = p->cpu;
+
 	/* Make sure to set the global runtime. It's OK to race as the value
 	 * will be the same across CPUs as well as multiple SMIs. */
 	if (smm_runtime == NULL)
@@ -157,6 +166,8 @@ void smm_handler_start(void *arg, int cpu, const struct smm_runtime *runtime)
 	smi_set_eos();
 }
 
+RMODULE_ENTRY(smm_handler_start);
+
 /* Provide a default implementation for all weak handlers so that relocation
  * entries in the modules make sense. Without default implementations the
  * weak relocations w/o a symbol have a 0 address which is where the modules
diff --git a/src/cpu/x86/smm/smm_module_header.c b/src/cpu/x86/smm/smm_module_header.c
deleted file mode 100644
index 3ee654f6cd..0000000000
--- a/src/cpu/x86/smm/smm_module_header.c
+++ /dev/null
@@ -1,24 +0,0 @@
-/*
- * This file is part of the coreboot project.
- *
- * Copyright (C) 2013 ChromeOS Authors
- *
- * 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 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
- */
-
-#include <rmodule.h>
-
-extern char smm_handler_start[];
-
-DEFINE_RMODULE_HEADER(smm_module, smm_handler_start, RMODULE_TYPE_SMM);
diff --git a/src/cpu/x86/smm/smm_stub.S b/src/cpu/x86/smm/smm_stub.S
index 07eb5dcb6d..083cb577b6 100644
--- a/src/cpu/x86/smm/smm_stub.S
+++ b/src/cpu/x86/smm/smm_stub.S
@@ -61,6 +61,8 @@ fallback_stack_top:
 .text
 .code16
 .global smm_handler_start
+.global __rmodule_entry
+__rmodule_entry:
 smm_handler_start:
 	movl	$(smm_relocate_gdt), %ebx
 	data32	lgdt (%ebx)
@@ -132,11 +134,13 @@ smm_trampoline32:
 2:
 	/* Call into the c-based SMM relocation function with the platform
 	 * parameters. Equivalent to:
-	 *   c_handler(c_handler_params, cpu_num, smm_runtime);
+	 *   struct arg = { c_handler_params, cpu_num, smm_runtime {;
+	 *   c_handler(&arg)
 	 */
 	push	$(smm_runtime)
 	push	%ecx
 	push	c_handler_arg
+	push	%esp
 	mov	c_handler, %eax
 	call	*%eax
 
diff --git a/src/include/cpu/x86/smm.h b/src/include/cpu/x86/smm.h
index 3ab43ff2ce..f63420fab5 100644
--- a/src/include/cpu/x86/smm.h
+++ b/src/include/cpu/x86/smm.h
@@ -517,14 +517,20 @@ struct smm_runtime {
 	u8 apic_id_to_cpu[CONFIG_MAX_CPUS];
 } __attribute__ ((packed));
 
-typedef void asmlinkage (*smm_handler_t)(void *arg, int cpu,
-                                         const struct smm_runtime *runtime);
+struct smm_module_params {
+	void *arg;
+	int cpu;
+	const struct smm_runtime *runtime;
+};
+
+/* smm_handler_t is called with arg of smm_module_params pointer. */
+typedef void asmlinkage (*smm_handler_t)(void *);
 
 #ifdef __SMM__
 /* SMM Runtime helpers. */
 
 /* Entry point for SMM modules. */
-void smm_handler_start(void *arg, int cpu, const struct smm_runtime *runtime);
+void asmlinkage smm_handler_start(void *params);
 
 /* Retrieve SMM save state for a given CPU. WARNING: This does not take into
  * account CPUs which are configured to not save their state to RAM. */
diff --git a/src/include/rmodule-defs.h b/src/include/rmodule-defs.h
index ee2d3f7bdd..4139ef3d41 100644
--- a/src/include/rmodule-defs.h
+++ b/src/include/rmodule-defs.h
@@ -25,30 +25,6 @@
 #define RMODULE_MAGIC 0xf8fe
 #define RMODULE_VERSION_1 1
 
-#define FIELD_ENTRY(x_) ((uint32_t)&x_)
-#define RMODULE_HEADER(entry_, type_)					\
-{									\
-	.magic = RMODULE_MAGIC,						\
-	.version = RMODULE_VERSION_1,					\
-	.type = type_,							\
-	.payload_begin_offset = FIELD_ENTRY(_payload_begin_offset),	\
-	.payload_end_offset = FIELD_ENTRY(_payload_end_offset),		\
-	.relocations_begin_offset  =					\
-		FIELD_ENTRY(_relocations_begin_offset),			\
-	.relocations_end_offset =					\
-		FIELD_ENTRY(_relocations_end_offset),			\
-	.module_link_start_address =					\
-		FIELD_ENTRY(_module_link_start_addr),			\
-	.module_program_size = FIELD_ENTRY(_module_program_size),	\
-	.module_entry_point = FIELD_ENTRY(entry_),			\
-	.parameters_begin = FIELD_ENTRY(_module_params_begin),		\
-	.parameters_end = FIELD_ENTRY(_module_params_end),		\
-	.bss_begin = FIELD_ENTRY(_bss),					\
-	.bss_end = FIELD_ENTRY(_ebss),					\
-}
-
-/* Private data structures below should not be used directly. */
-
 /* All fields with '_offset' in the name are byte offsets into the flat blob.
  * The linker and the linker script takes are of assigning the values.  */
 struct rmodule_header {
diff --git a/src/include/rmodule.h b/src/include/rmodule.h
index 2147ab0919..d229cf816a 100644
--- a/src/include/rmodule.h
+++ b/src/include/rmodule.h
@@ -21,6 +21,7 @@
 
 #include <stdint.h>
 #include <stddef.h>
+#include <string.h>
 #include <rmodule-defs.h>
 
 enum {
@@ -50,11 +51,6 @@ int rmodule_load_alignment(const struct rmodule *m);
 int rmodule_calc_region(unsigned int region_alignment, size_t rmodule_size,
                         size_t *region_size, int *load_offset);
 
-#define DEFINE_RMODULE_HEADER(name_, entry_, type_) \
-	struct rmodule_header name_ \
-	__attribute__ ((section (".module_header"))) = \
-	RMODULE_HEADER(entry_, type_)
-
 /* Support for loading rmodule stages. This API is only available when
  * using dynamic cbmem because it uses the dynamic cbmem API to obtain
  * the backing store region for the stage. */
@@ -84,17 +80,12 @@ struct rmodule {
 	void *relocations;
 };
 
-/* These are the symbols assumed that every module contains. The linker script
- * provides these symbols. */
-extern char _relocations_begin_offset[];
-extern char _relocations_end_offset[];
-extern char _payload_end_offset[];
-extern char _payload_begin_offset[];
-extern char _bss[];
-extern char _ebss[];
-extern char _module_program_size[];
-extern char _module_link_start_addr[];
-extern char _module_params_begin[];
-extern char _module_params_end[];
+#if IS_ENABLED(CONFIG_RELOCATABLE_MODULES)
+/* Rmodules have an entry point of named __rmodule_entry. */
+#define RMODULE_ENTRY(entry_) \
+	void __rmodule_entry(void *) __attribute__((alias (STRINGIFY(entry_))))
+#else
+#define RMODULE_ENTRY(entry_)
+#endif
 
 #endif /* RMODULE_H */
diff --git a/src/lib/Makefile.inc b/src/lib/Makefile.inc
index acd334e25d..93babd3c1f 100644
--- a/src/lib/Makefile.inc
+++ b/src/lib/Makefile.inc
@@ -133,17 +133,21 @@ ramstage-y += rmodule.c
 romstage-$(CONFIG_RELOCATABLE_RAMSTAGE) += rmodule.c
 
 RMODULE_LDSCRIPT := $(src)/lib/rmodule.ld
-RMODULE_LDFLAGS  := -nostartfiles -shared -z defs -nostdlib -Bsymbolic -T $(RMODULE_LDSCRIPT)
+RMODULE_LDFLAGS  := -nostartfiles -Wl,--emit-relocs -Wl,-z,defs -Wl,-Bsymbolic -Wl,-T,$(RMODULE_LDSCRIPT)
 
 # rmodule_link_rules is a function that should be called with:
 # (1) the object name to link
 # (2) the dependencies
 # (3) heap size of the relocatable module
-# It will create the necessary Make rules.
+# It will create the necessary Make rules to create a rmodule. The resulting
+# rmdoule is named $(1).rmod
 define rmodule_link
-$(strip $(1)): $(strip $(2)) $$(RMODULE_LDSCRIPT) $$(obj)/ldoptions
-	$$(LD) $$(RMODULE_LDFLAGS) --defsym=__heap_size=$(strip $(3)) -o $$@ $(strip $(2))
+$(strip $(1)): $(strip $(2)) $$(RMODULE_LDSCRIPT) $$(obj)/ldoptions $$(RMODTOOL)
+	$$(CC) $$(CFLAGS) $$(RMODULE_LDFLAGS) -Wl,--defsym=__heap_size=$(strip $(3)) -o $$@ -Wl,--start-group $(strip $(2)) $$(LIBGCC_FILE_NAME) -Wl,--end-group
 	$$(NM) -n $$@ > $$(basename $$@).map
+
+$(strip $(1)).rmod: $(strip $(1))
+	$$(RMODTOOL) -i $$^ -o $$@
 endef
 
 endif
diff --git a/src/lib/rmodule.c b/src/lib/rmodule.c
index 2cb70b8f33..a73e667fef 100644
--- a/src/lib/rmodule.c
+++ b/src/lib/rmodule.c
@@ -26,44 +26,6 @@
 /* Change this define to get more verbose debugging for module loading. */
 #define PK_ADJ_LEVEL BIOS_NEVER
 
-#if CONFIG_ARCH_X86
-/*
- * On X86, the only relocations currently allowed are R_386_RELATIVE which
- * have '0' for the symbol info in the relocation metadata (in r_info).
- * The reason is that the module is fully linked and just has the relocations'
- * locations.
- */
-typedef struct {
-	uint32_t r_offset;
-	uint32_t r_info;
-} Elf32_Rel;
-
-#define R_386_RELATIVE 8
-
-#define RELOCTION_ENTRY_SIZE sizeof(Elf32_Rel)
-static inline int rmodule_reloc_offset(const void *reloc)
-{
-	const Elf32_Rel *rel = reloc;
-	return rel->r_offset;
-}
-
-static inline int rmodule_reloc_valid(const void *reloc)
-{
-	const Elf32_Rel *rel = reloc;
-	return (rel->r_info == R_386_RELATIVE);
-}
-
-static inline void *remodule_next_reloc(const void *reloc)
-{
-	const Elf32_Rel *rel = reloc;
-	rel++;
-	return (void *)rel;
-}
-
-#else
-#error Arch needs to add relocation information support for RMODULE
-#endif
-
 static inline int rmodule_is_loaded(const struct rmodule *module)
 {
 	return module->location != NULL;
@@ -71,7 +33,7 @@ static inline int rmodule_is_loaded(const struct rmodule *module)
 
 /* Calculate a loaded program address based on the blob address. */
 static inline void *rmodule_load_addr(const struct rmodule *module,
-                                      uint32_t blob_addr)
+                                      uintptr_t blob_addr)
 {
 	char *loc = module->location;
 	return &loc[blob_addr - module->header->module_link_start_address];
@@ -151,13 +113,13 @@ static void rmodule_clear_bss(struct rmodule *module)
 	memset(begin, 0, size);
 }
 
-static inline int rmodule_number_relocations(const struct rmodule *module)
+static inline size_t rmodule_number_relocations(const struct rmodule *module)
 {
-	int r;
+	size_t r;
 
 	r = module->header->relocations_end_offset;
 	r -= module->header->relocations_begin_offset;
-	r /= RELOCTION_ENTRY_SIZE;
+	r /= sizeof(uintptr_t);
 	return r;
 }
 
@@ -176,51 +138,33 @@ static void rmodule_copy_payload(const struct rmodule *module)
 	memcpy(module->location, module->payload, module->payload_size);
 }
 
-static inline uint32_t *rmodule_adjustment_location(const struct rmodule *module,
-                                               const void *reloc)
-{
-	int reloc_offset;
-
-	/* Don't relocate header field entries -- only program relocations. */
-	reloc_offset = rmodule_reloc_offset(reloc);
-	if (reloc_offset < module->header->module_link_start_address)
-		return NULL;
-
-	return rmodule_load_addr(module, reloc_offset);
-}
-
 static int rmodule_relocate(const struct rmodule *module)
 {
-	int num_relocations;
-	const void *reloc;
-	uint32_t adjustment;
+	size_t num_relocations;
+	const uintptr_t *reloc;
+	uintptr_t adjustment;
 
 	/* Each relocation needs to be adjusted relative to the beginning of
 	 * the loaded program. */
-	adjustment = (uint32_t)rmodule_load_addr(module, 0);
+	adjustment = (uintptr_t)rmodule_load_addr(module, 0);
 
 	reloc = module->relocations;
 	num_relocations = rmodule_number_relocations(module);
 
-	printk(BIOS_DEBUG, "Processing %d relocs with adjust value of 0x%08x\n",
+	printk(BIOS_DEBUG, "Processing %zu relocs. Offset value of 0x%08x\n",
 	       num_relocations, adjustment);
 
 	while (num_relocations > 0) {
-		uint32_t *adjust_loc;
-
-		if (!rmodule_reloc_valid(reloc))
-			return -1;
+		uintptr_t *adjust_loc;
 
 		/* If the adjustment location is non-NULL adjust it. */
-		adjust_loc = rmodule_adjustment_location(module, reloc);
-		if (adjust_loc != NULL) {
-			printk(PK_ADJ_LEVEL, "Adjusting %p: 0x%08x -> 0x%08x\n",
+		adjust_loc = rmodule_load_addr(module, *reloc);
+		printk(PK_ADJ_LEVEL, "Adjusting %p: 0x%08x -> 0x%08x\n",
 			       adjust_loc, *adjust_loc,
 			       *adjust_loc + adjustment);
 			*adjust_loc += adjustment;
-		}
 
-		reloc = remodule_next_reloc(reloc);
+		reloc++;
 		num_relocations--;
 	}
 
@@ -232,8 +176,8 @@ int rmodule_load_alignment(const struct rmodule *module)
 	/* The load alignment is the start of the program's linked address.
 	 * The base address where the program is loaded needs to be a multiple
 	 * of the program's starting link address. That way all data alignment
-	 * in the program is preserved. */
-	return module->header->module_link_start_address;
+	 * in the program is preserved. Default to 4KiB. */
+	return 4096;
 }
 
 int rmodule_load(void *base, struct rmodule *module)
diff --git a/src/lib/rmodule.ld b/src/lib/rmodule.ld
index 0cdbb2fa25..9222f3b876 100644
--- a/src/lib/rmodule.ld
+++ b/src/lib/rmodule.ld
@@ -1,19 +1,15 @@
-OUTPUT_FORMAT("elf32-i386", "elf32-i386", "elf32-i386")
-OUTPUT_ARCH(i386)
-
 /*
  * This linker script is used to link rmodules (relocatable modules).  It
  * links at zero so that relocation fixups are easy when placing the binaries
  * anywhere in the address space.
  *
  * NOTE:  The program's loadable sections (text, module_params, and data) are
- * packed into the flat blob using the AT directive. The rmodule loader assumes
- * the entire program resides in one contiguous address space. Therefore,
- * alignment for a given section (if required) needs to be done at the end of
- * the preceeding section. e.g. if the data section should be aligned to an 8
- * byte address the text section should have ALIGN(8) at the end of its section.
- * Otherwise there won't be a consistent mapping between the flat blob and the
- * loaded program.
+ * packed into the flat blob. The rmodule loader assumes the entire program
+ * resides in one contiguous address space. Therefore, alignment for a given
+ * section (if required) needs to be done at the end of the preceeding section.
+ * e.g. if the data section should be aligned to an 8 byte address the text
+ * section should have ALIGN(8) at the end of its section.  Otherwise there
+ * won't be a consistent mapping between the flat blob and the loaded program.
  */
 
 BASE_ADDRESS = 0x00000;
@@ -22,21 +18,9 @@ SECTIONS
 {
 	. = BASE_ADDRESS;
 
-	.header : AT (0) {
-		*(.module_header);
-		. = ALIGN(8);
-	}
-
-	/* Align the start of the module program to a large enough alignment
-	 * so that any data in the program with an alignement property is met.
-	 * Essentially, this alignment is the maximum possible data alignment
-	 * property a program can have. */
-	. = ALIGN(4096);
-	_module_link_start_addr = .;
-	_payload_begin_offset  = LOADADDR(.header) + SIZEOF(.header);
-
-	.payload : AT (_payload_begin_offset) {
+	.payload :  {
 		/* C code of the module. */
+		_ram_seg = .;
 		*(.textfirst);
 		*(.text);
 		*(.text.*);
@@ -88,9 +72,6 @@ SECTIONS
 		. = ALIGN(8);
 	}
 
-	/* _payload_end marks the end of the module's code and data. */
-	_payload_end_offset = LOADADDR(.payload) + SIZEOF(.payload);
-
 	.bss (NOLOAD) : {
 		/* C uninitialized data of the module. */
 		_bss = .;
@@ -107,38 +88,11 @@ SECTIONS
 		_heap = .;
 		. = . + __heap_size;
 		_eheap = .;
+		_eram_seg = .;
 	}
 
-	/* _module_program_size is the total memory used by the program. */
-	_module_program_size = _eheap - _module_link_start_addr;
-
-	/* coreboot's ramstage uses the _ram_seg and _eram_seg symbols
-	 * for determining its load location. Provide those to help it out.
-	 * It's a nop for any non-ramstage rmodule. */
-	_ram_seg = _module_link_start_addr;
-	_eram_seg = _module_link_start_addr + _module_program_size;
-
-	/* The relocation information is linked on top of the BSS section
-	 * because the BSS section takes no space on disk. The relocation data
-	 * resides directly after the data section in the flat binary. */
-	.relocations ADDR(.bss) : AT (_payload_end_offset) {
-		*(.rel.*);
-	}
-	_relocations_begin_offset = LOADADDR(.relocations);
-	_relocations_end_offset  = _relocations_begin_offset +
-	                           SIZEOF(.relocations);
-
 	/DISCARD/ : {
-		/* Drop unnecessary sections. Since these modules are linked
-		 * as shared objects there are dynamic sections. These sections
-		 * aren't needed so drop them. */
-		*(.comment);
-		*(.note);
-		*(.note.*);
-		*(.dynamic);
-		*(.dynsym);
-		*(.dynstr);
-		*(.gnu.hash);
+		/* Drop unnecessary sections. */
 		*(.eh_frame);
 	}
 }
diff --git a/src/soc/intel/baytrail/cpu.c b/src/soc/intel/baytrail/cpu.c
index 1226e471ad..c55053103c 100644
--- a/src/soc/intel/baytrail/cpu.c
+++ b/src/soc/intel/baytrail/cpu.c
@@ -112,11 +112,17 @@ static void adjust_apic_id_map(struct smm_loader_params *smm_params)
 		runtime->apic_id_to_cpu[i] = mp_get_apic_id(i);
 }
 
-static void asmlinkage
-cpu_smm_do_relocation(void *arg, int cpu, const struct smm_runtime *runtime)
+static void asmlinkage cpu_smm_do_relocation(void *arg)
 {
 	msr_t smrr;
 	em64t100_smm_state_save_area_t *smm_state;
+	const struct smm_module_params *p;
+	const struct smm_runtime *runtime;
+	int cpu;
+
+	p = arg;
+	runtime = p->runtime;
+	cpu = p->cpu;
 
 	if (cpu >= CONFIG_MAX_CPUS) {
 		printk(BIOS_CRIT,
diff --git a/src/vendorcode/google/chromeos/Makefile.inc b/src/vendorcode/google/chromeos/Makefile.inc
index 007bd575e7..21e1750b83 100644
--- a/src/vendorcode/google/chromeos/Makefile.inc
+++ b/src/vendorcode/google/chromeos/Makefile.inc
@@ -51,6 +51,7 @@ VB_INCLUDES += -I$(VB_SOURCE)/firmware/include
 INCLUDES += $(VB_INCLUDES)
 
 VBOOT_STUB_ELF = $(obj)/vendorcode/google/chromeos/vbootstub.elf
+VBOOT_STUB = $(VBOOT_STUB_ELF).rmod
 VBOOT_STUB_DOTO = $(VBOOT_STUB_ELF:.elf=.o)
 
 # Dependency for the vboot rmodules. Ordering matters.
diff --git a/src/vendorcode/google/chromeos/vboot_wrapper.c b/src/vendorcode/google/chromeos/vboot_wrapper.c
index 66b7cfb276..fe3c022833 100644
--- a/src/vendorcode/google/chromeos/vboot_wrapper.c
+++ b/src/vendorcode/google/chromeos/vboot_wrapper.c
@@ -24,10 +24,6 @@
 #include "vboot_context.h"
 #include "vboot_handoff.h"
 
-static void vboot_wrapper(struct vboot_context *context);
-
-DEFINE_RMODULE_HEADER(vboot_wrapper_header, vboot_wrapper, RMODULE_TYPE_VBOOT);
-
 /* Keep a global context pointer around for the callbacks to use. */
 static struct vboot_context *gcontext;
 
@@ -63,12 +59,14 @@ static void parse_component(const struct components *components, int num,
 	fw->size = (uint32_t)components->entries[num].size;
 }
 
-static void vboot_wrapper(struct vboot_context *context)
+static void vboot_wrapper(void *arg)
 {
 	int i;
 	VbError_t res;
 	const struct components *components;
+	struct vboot_context *context;
 
+	context = arg;
 	gcontext = context;
 
 	VbExDebug("Calling VbInit()\n");
@@ -266,3 +264,4 @@ VbError_t VbExTpmSendReceive(const uint8_t *request, uint32_t request_length,
 	return VBERROR_SUCCESS;
 }
 
+RMODULE_ENTRY(vboot_wrapper);