util/cbfstool: Support AMD64 rmodules

Add support for 64bit rmodule, as required for relocatable
ramstage on x86_64.

Change-Id: I7fbb3b4c0f76ce82c090b5f16f67a728b6bf94a5
Signed-off-by: Patrick Rudolph <siro@das-labor.org>
Reviewed-on: https://review.coreboot.org/c/29874
Reviewed-by: Philipp Deppenwiese <zaolin.daisuki@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

3 files changed, 72 insertions, 0 deletions

diff --git a/util/cbfstool/elf.h b/util/cbfstool/elf.h
index a0bb35dd94..43fd7f33eb 100644
--- a/util/cbfstool/elf.h
+++ b/util/cbfstool/elf.h
@@ -1148,6 +1148,43 @@ typedef struct
 /* Keep this the last entry.  */
 #define R_386_NUM	   38
 
+/* AMD64 specific definitions. */
+#define	R_AMD64_NONE		0	/* relocation types */
+#define	R_AMD64_64		1
+#define	R_AMD64_PC32		2
+#define	R_AMD64_GOT32		3
+#define	R_AMD64_PLT32		4
+#define	R_AMD64_COPY		5
+#define	R_AMD64_GLOB_DAT	6
+#define	R_AMD64_JUMP_SLOT	7
+#define	R_AMD64_RELATIVE	8
+#define	R_AMD64_GOTPCREL	9
+#define	R_AMD64_32		10
+#define	R_AMD64_32S		11
+#define	R_AMD64_16		12
+#define	R_AMD64_PC16		13
+#define	R_AMD64_8		14
+#define	R_AMD64_PC8		15
+#define	R_AMD64_DTPMOD64	16
+#define	R_AMD64_DTPOFF64	17
+#define	R_AMD64_TPOFF64		18
+#define	R_AMD64_TLSGD		19
+#define	R_AMD64_TLSLD		20
+#define	R_AMD64_DTPOFF32	21
+#define	R_AMD64_GOTTPOFF	22
+#define	R_AMD64_TPOFF32		23
+#define	R_AMD64_PC64		24
+#define	R_AMD64_GOTOFF64	25
+#define	R_AMD64_GOTPC32		26
+#define	R_AMD64_GOT64		27	/* reserved for future expansion */
+#define	R_AMD64_GOTPCREL64	28	/* reserved for future expansion */
+#define	R_AMD64_GOTPC64		29	/* reserved for future expansion */
+#define	R_AMD64_GOTPLT64	30	/* reserved for future expansion */
+#define	R_AMD64_PLTOFF64	31	/* reserved for future expansion */
+#define	R_AMD64_SIZE32		32
+#define	R_AMD64_SIZE64		33
+#define	R_AMD64_NUM	34
+
 /* SUN SPARC specific definitions.  */
 
 /* Legal values for ST_TYPE subfield of st_info (symbol type).  */
diff --git a/util/cbfstool/elfheaders.c b/util/cbfstool/elfheaders.c
index 9d02c30573..8da54d09e0 100644
--- a/util/cbfstool/elfheaders.c
+++ b/util/cbfstool/elfheaders.c
@@ -1072,6 +1072,9 @@ static void fixup_relocations(struct elf_writer *ew)
 	case EM_386:
 		type = R_386_32;
 		break;
+	case EM_X86_64:
+		type =  R_AMD64_64;
+		break;
 	case EM_ARM:
 		type = R_ARM_ABS32;
 		break;
diff --git a/util/cbfstool/rmodule.c b/util/cbfstool/rmodule.c
index ff8f1cdef2..f270e3ec8f 100644
--- a/util/cbfstool/rmodule.c
+++ b/util/cbfstool/rmodule.c
@@ -44,6 +44,33 @@ static int should_emit_386(Elf64_Rela *rel)
 	return (type == R_386_32);
 }
 
+static int valid_reloc_amd64(Elf64_Rela *rel)
+{
+	int type;
+
+	type = ELF64_R_TYPE(rel->r_info);
+
+	/* Only these 5 relocations are expected to be found. */
+	return (type == R_AMD64_64 ||
+		type == R_AMD64_PC64 ||
+		type == R_AMD64_32S ||
+		type == R_AMD64_32 ||
+		type == R_AMD64_PC32);
+}
+
+static int should_emit_amd64(Elf64_Rela *rel)
+{
+	int type;
+
+	type = ELF64_R_TYPE(rel->r_info);
+
+	/* Only emit absolute relocations */
+	return (type == R_AMD64_64 ||
+		type == R_AMD64_PC64 ||
+		type == R_AMD64_32S ||
+		type == R_AMD64_32);
+}
+
 static int valid_reloc_arm(Elf64_Rela *rel)
 {
 	int type;
@@ -101,6 +128,11 @@ static const struct arch_ops reloc_ops[] = {
 		.should_emit = should_emit_386,
 	},
 	{
+		.arch = EM_X86_64,
+		.valid_type = valid_reloc_amd64,
+		.should_emit = should_emit_amd64,
+	},
+	{
 		.arch = EM_ARM,
 		.valid_type = valid_reloc_arm,
 		.should_emit = should_emit_arm,