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linux-7.2.3/arch/s390/tools/.gitignore

@@ -0,0 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0-only
+gen_facilities
+gen_opcode_table
+relocs

linux-7.2.3/arch/s390/tools/Makefile

@@ -0,0 +1,32 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Makefile for s390 specific build tools
+#
+
+kapi := arch/$(ARCH)/include/generated/asm
+kapi-hdrs-y := $(kapi)/facility-defs.h $(kapi)/dis-defs.h
+
+PHONY += kapi
+
+kapi:	$(kapi-hdrs-y)
+
+hostprogs		    += gen_facilities
+hostprogs		    += gen_opcode_table
+
+HOSTCFLAGS_gen_facilities.o += $(LINUXINCLUDE)
+
+filechk_facility-defs.h = $(obj)/gen_facilities
+
+filechk_dis-defs.h = \
+	$(obj)/gen_opcode_table < $(srctree)/arch/$(ARCH)/tools/opcodes.txt
+
+$(kapi)/facility-defs.h: $(obj)/gen_facilities FORCE
+	$(call filechk,facility-defs.h)
+
+$(kapi)/dis-defs.h: $(obj)/gen_opcode_table FORCE
+	$(call filechk,dis-defs.h)
+
+hostprogs	+= relocs
+PHONY		+= relocs
+relocs: $(obj)/relocs
+	@:

linux-7.2.3/arch/s390/tools/gcc-thunk-extern.sh

@@ -0,0 +1,24 @@
+#!/bin/sh
+# SPDX-License-Identifier: GPL-2.0
+# Borrowed from gcc: gcc/testsuite/gcc.target/s390/nobp-section-type-conflict.c
+# Checks that we don't get error: section type conflict with ‘put_page’.
+
+cat << "END" | $@ -x c - -fno-PIE -march=z10 -mindirect-branch=thunk-extern -mfunction-return=thunk-extern -mindirect-branch-table -O2 -c -o /dev/null
+int a;
+int b (void);
+void c (int);
+
+static void
+put_page (void)
+{
+  if (b ())
+    c (a);
+}
+
+__attribute__ ((__section__ (".init.text"), __cold__)) void
+d (void)
+{
+  put_page ();
+  put_page ();
+}
+END

linux-7.2.3/arch/s390/tools/gen_facilities.c

@@ -0,0 +1,175 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Simple program to generate defines out of facility lists that use the bit
+ * numbering scheme from the Princples of Operations: most significant bit
+ * has bit number 0.
+ *
+ *    Copyright IBM Corp. 2015, 2018
+ *
+ */
+
+#include <strings.h>
+#include <string.h>
+#include <stdlib.h>
+#include <stdio.h>
+
+struct facility_def {
+	char *name;
+	int *bits;
+};
+
+static struct facility_def facility_defs[] = {
+	{
+		/*
+		 * FACILITIES_ALS contains the list of facilities that are
+		 * required to run a kernel that is compiled e.g. with
+		 * -march=<machine>.
+		 */
+		.name = "FACILITIES_ALS",
+		.bits = (int[]){
+			0,  /* N3 instructions */
+			1,  /* z/Arch mode installed */
+			3,  /* dat-enhancement 1 */
+			18, /* long displacement facility */
+			21, /* extended-immediate facility */
+			25, /* store clock fast */
+			27, /* mvcos */
+			32, /* compare and swap and store */
+			33, /* compare and swap and store 2 */
+			34, /* general instructions extension */
+			35, /* execute extensions */
+#ifdef CONFIG_HAVE_MARCH_Z196_FEATURES
+			45, /* fast-BCR, etc. */
+#endif
+#ifdef CONFIG_HAVE_MARCH_ZEC12_FEATURES
+			49, /* misc-instruction-extensions */
+			52, /* interlocked facility 2 */
+#endif
+#ifdef CONFIG_HAVE_MARCH_Z13_FEATURES
+			53, /* load-and-zero-rightmost-byte, etc. */
+			129, /* vector */
+#endif
+#ifdef CONFIG_HAVE_MARCH_Z14_FEATURES
+			58, /* miscellaneous-instruction-extension 2 */
+#endif
+#ifdef CONFIG_HAVE_MARCH_Z15_FEATURES
+			61, /* miscellaneous-instruction-extension 3 */
+#endif
+#ifdef CONFIG_HAVE_MARCH_Z17_FEATURES
+			84, /* miscellaneous-instruction-extension 4 */
+#endif
+			-1 /* END */
+		}
+	},
+	{
+		/*
+		 * FACILITIES_KVM contains the list of facilities that are part
+		 * of the default facility mask and list that are passed to the
+		 * initial CPU model. If no CPU model is used, this, together
+		 * with the non-hypervisor managed bits, is the maximum list of
+		 * guest facilities supported by KVM.
+		 */
+		.name = "FACILITIES_KVM",
+		.bits = (int[]){
+			0,  /* N3 instructions */
+			1,  /* z/Arch mode installed */
+			2,  /* z/Arch mode active */
+			3,  /* DAT-enhancement */
+			4,  /* idte segment table */
+			5,  /* idte region table */
+			6,  /* ASN-and-LX reuse */
+			7,  /* stfle */
+			8,  /* enhanced-DAT 1 */
+			9,  /* sense-running-status */
+			10, /* conditional sske */
+			13, /* ipte-range */
+			14, /* nonquiescing key-setting */
+			73, /* transactional execution */
+			75, /* access-exception-fetch/store indication */
+			76, /* msa extension 3 */
+			77, /* msa extension 4 */
+			78, /* enhanced-DAT 2 */
+			130, /* instruction-execution-protection */
+			131, /* enhanced-SOP 2 and side-effect */
+			139, /* multiple epoch facility */
+			146, /* msa extension 8 */
+			150, /* enhanced sort */
+			151, /* deflate conversion */
+			155, /* msa extension 9 */
+			-1  /* END */
+		}
+	},
+	{
+		/*
+		 * FACILITIES_KVM_CPUMODEL contains the list of facilities
+		 * that can be enabled by CPU model code if the host supports
+		 * it. These facilities are not passed to the guest without
+		 * CPU model support.
+		 */
+
+		.name = "FACILITIES_KVM_CPUMODEL",
+		.bits = (int[]){
+			12, /* AP Query Configuration Information */
+			15, /* AP Facilities Test */
+			156, /* etoken facility */
+			165, /* nnpa facility */
+			170, /* ineffective-nonconstrained-transaction facility */
+			193, /* bear enhancement facility */
+			194, /* rdp enhancement facility */
+			196, /* processor activity instrumentation facility */
+			197, /* processor activity instrumentation extension 1 */
+			201, /* concurrent-functions facility */
+			-1  /* END */
+		}
+	},
+};
+
+static void print_facility_list(struct facility_def *def)
+{
+	unsigned int high, bit, dword, i;
+	unsigned long long *array;
+
+	array = calloc(1, 8);
+	if (!array)
+		exit(EXIT_FAILURE);
+	high = 0;
+	for (i = 0; def->bits[i] != -1; i++) {
+		bit = 63 - (def->bits[i] & 63);
+		dword = def->bits[i] / 64;
+		if (dword > high) {
+			array = realloc(array, (dword + 1) * 8);
+			if (!array)
+				exit(EXIT_FAILURE);
+			memset(array + high + 1, 0, (dword - high) * 8);
+			high = dword;
+		}
+		array[dword] |= 1ULL << bit;
+	}
+	printf("#define %s ", def->name);
+	for (i = 0; i <= high; i++)
+		printf("_AC(0x%016llx,UL)%c", array[i], i < high ? ',' : '\n');
+	free(array);
+}
+
+static void print_facility_lists(void)
+{
+	unsigned int i;
+
+	for (i = 0; i < sizeof(facility_defs) / sizeof(facility_defs[0]); i++)
+		print_facility_list(&facility_defs[i]);
+}
+
+int main(int argc, char **argv)
+{
+	printf("#ifndef __ASM_S390_FACILITY_DEFS__\n");
+	printf("#define __ASM_S390_FACILITY_DEFS__\n");
+	printf("/*\n");
+	printf(" * DO NOT MODIFY.\n");
+	printf(" *\n");
+	printf(" * This file was generated by %s\n", __FILE__);
+	printf(" */\n\n");
+	printf("#include <linux/const.h>\n\n");
+	print_facility_lists();
+	printf("\n#endif\n");
+	return 0;
+}

linux-7.2.3/arch/s390/tools/gen_opcode_table.c

@@ -0,0 +1,352 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Generate opcode table initializers for the in-kernel disassembler.
+ *
+ *    Copyright IBM Corp. 2017
+ *
+ */
+
+#include <stdlib.h>
+#include <string.h>
+#include <ctype.h>
+#include <stdio.h>
+
+#define STRING_SIZE_MAX 20
+
+struct insn_type {
+	unsigned char byte;
+	unsigned char mask;
+	char **format;
+};
+
+struct insn {
+	struct insn_type *type;
+	char opcode[STRING_SIZE_MAX];
+	char name[STRING_SIZE_MAX];
+	char upper[STRING_SIZE_MAX];
+	char format[STRING_SIZE_MAX];
+	unsigned int name_len;
+};
+
+struct insn_group {
+	struct insn_type *type;
+	int offset;
+	int count;
+	char opcode[2];
+};
+
+struct insn_format {
+	char *format;
+	int type;
+};
+
+struct gen_opcode {
+	struct insn *insn;
+	int nr;
+	struct insn_group *group;
+	int nr_groups;
+};
+
+/*
+ * Table of instruction format types. Each opcode is defined with at
+ * least one byte (two nibbles), three nibbles, or two bytes (four
+ * nibbles).
+ * The byte member of each instruction format type entry defines
+ * within which byte of an instruction the third (and fourth) nibble
+ * of an opcode can be found. The mask member is the and-mask that
+ * needs to be applied on this byte in order to get the third (and
+ * fourth) nibble of the opcode.
+ * The format array defines all instruction formats (as defined in the
+ * Principles of Operation) which have the same position of the opcode
+ * nibbles.
+ * A special case are instruction formats with 1-byte opcodes. In this
+ * case the byte member always is zero, so that the mask is applied on
+ * the (only) byte that contains the opcode.
+ */
+static struct insn_type insn_type_table[] = {
+	{
+		.byte = 0,
+		.mask = 0xff,
+		.format = (char *[]) {
+			"MII",
+			"RR",
+			"RS",
+			"RSI",
+			"RX",
+			"SI",
+			"SMI",
+			"SS",
+			NULL,
+		},
+	},
+	{
+		.byte = 1,
+		.mask = 0x0f,
+		.format = (char *[]) {
+			"RI",
+			"RIL",
+			"SSF",
+			NULL,
+		},
+	},
+	{
+		.byte = 1,
+		.mask = 0xff,
+		.format = (char *[]) {
+			"E",
+			"IE",
+			"RRE",
+			"RRF",
+			"RRR",
+			"S",
+			"SIL",
+			"SSE",
+			NULL,
+		},
+	},
+	{
+		.byte = 5,
+		.mask = 0xff,
+		.format = (char *[]) {
+			"RIE",
+			"RIS",
+			"RRS",
+			"RSE",
+			"RSL",
+			"RSY",
+			"RXE",
+			"RXF",
+			"RXY",
+			"SIY",
+			"VRI",
+			"VRR",
+			"VRS",
+			"VRV",
+			"VRX",
+			"VSI",
+			NULL,
+		},
+	},
+};
+
+static struct insn_type *insn_format_to_type(char *format)
+{
+	char tmp[STRING_SIZE_MAX];
+	char *base_format, **ptr;
+	int i;
+
+	strcpy(tmp, format);
+	base_format = tmp;
+	base_format = strsep(&base_format, "_");
+	for (i = 0; i < sizeof(insn_type_table) / sizeof(insn_type_table[0]); i++) {
+		ptr = insn_type_table[i].format;
+		while (*ptr) {
+			if (!strcmp(base_format, *ptr))
+				return &insn_type_table[i];
+			ptr++;
+		}
+	}
+	exit(EXIT_FAILURE);
+}
+
+static void read_instructions(struct gen_opcode *desc)
+{
+	struct insn insn;
+	int rc, i;
+
+	while (1) {
+		rc = scanf("%s %s %s", insn.opcode, insn.name, insn.format);
+		if (rc == EOF)
+			break;
+		if (rc != 3)
+			exit(EXIT_FAILURE);
+		insn.type = insn_format_to_type(insn.format);
+		insn.name_len = strlen(insn.name);
+		for (i = 0; i <= insn.name_len; i++)
+			insn.upper[i] = toupper((unsigned char)insn.name[i]);
+		desc->nr++;
+		desc->insn = realloc(desc->insn, desc->nr * sizeof(*desc->insn));
+		if (!desc->insn)
+			exit(EXIT_FAILURE);
+		desc->insn[desc->nr - 1] = insn;
+	}
+}
+
+static int cmpformat(const void *a, const void *b)
+{
+	return strcmp(((struct insn *)a)->format, ((struct insn *)b)->format);
+}
+
+static void print_formats(struct gen_opcode *desc)
+{
+	char *format;
+	int i, count;
+
+	qsort(desc->insn, desc->nr, sizeof(*desc->insn), cmpformat);
+	format = "";
+	count = 0;
+	printf("enum {\n");
+	for (i = 0; i < desc->nr; i++) {
+		if (!strcmp(format, desc->insn[i].format))
+			continue;
+		count++;
+		format = desc->insn[i].format;
+		printf("\tINSTR_%s,\n", format);
+	}
+	printf("}; /* %d */\n\n", count);
+}
+
+static int cmp_long_insn(const void *a, const void *b)
+{
+	return strcmp(((struct insn *)a)->name, ((struct insn *)b)->name);
+}
+
+static void print_insn_name(const char *name)
+{
+	size_t i, len;
+
+	len = strlen(name);
+	printf("{");
+	for (i = 0; i < len; i++)
+		printf(" \'%c\',", name[i]);
+	printf(" }");
+}
+
+static void print_long_insn(struct gen_opcode *desc)
+{
+	struct insn *insn;
+	int i, count;
+
+	qsort(desc->insn, desc->nr, sizeof(*desc->insn), cmp_long_insn);
+	count = 0;
+	printf("enum {\n");
+	for (i = 0; i < desc->nr; i++) {
+		insn = &desc->insn[i];
+		if (insn->name_len < 6)
+			continue;
+		printf("\tLONG_INSN_%s,\n", insn->upper);
+		count++;
+	}
+	printf("}; /* %d */\n\n", count);
+
+	printf("#define LONG_INSN_INITIALIZER { \\\n");
+	for (i = 0; i < desc->nr; i++) {
+		insn = &desc->insn[i];
+		if (insn->name_len < 6)
+			continue;
+		printf("\t[LONG_INSN_%s] = ", insn->upper);
+		print_insn_name(insn->name);
+		printf(", \\\n");
+	}
+	printf("}\n\n");
+}
+
+static void print_opcode(struct insn *insn, int nr)
+{
+	char *opcode;
+
+	opcode = insn->opcode;
+	if (insn->type->byte != 0)
+		opcode += 2;
+	printf("\t[%4d] = { .opfrag = 0x%s, .format = INSTR_%s, ", nr, opcode, insn->format);
+	if (insn->name_len < 6) {
+		printf(".name =  ");
+		print_insn_name(insn->name);
+	} else {
+		printf(".offset = LONG_INSN_%s", insn->upper);
+	}
+	printf(" }, \\\n");
+}
+
+static void add_to_group(struct gen_opcode *desc, struct insn *insn, int offset)
+{
+	struct insn_group *group;
+
+	group = desc->group ? &desc->group[desc->nr_groups - 1] : NULL;
+	if (group && (!strncmp(group->opcode, insn->opcode, 2) || group->type->byte == 0)) {
+		group->count++;
+		return;
+	}
+	desc->nr_groups++;
+	desc->group = realloc(desc->group, desc->nr_groups * sizeof(*desc->group));
+	if (!desc->group)
+		exit(EXIT_FAILURE);
+	group = &desc->group[desc->nr_groups - 1];
+	memcpy(group->opcode, insn->opcode, 2);
+	group->type = insn->type;
+	group->offset = offset;
+	group->count = 1;
+}
+
+static int cmpopcode(const void *a, const void *b)
+{
+	return strcmp(((struct insn *)a)->opcode, ((struct insn *)b)->opcode);
+}
+
+static void print_opcode_table(struct gen_opcode *desc)
+{
+	char opcode[2] = "";
+	struct insn *insn;
+	int i, offset;
+
+	qsort(desc->insn, desc->nr, sizeof(*desc->insn), cmpopcode);
+	printf("#define OPCODE_TABLE_INITIALIZER { \\\n");
+	offset = 0;
+	for (i = 0; i < desc->nr; i++) {
+		insn = &desc->insn[i];
+		if (insn->type->byte == 0)
+			continue;
+		add_to_group(desc, insn, offset);
+		if (strncmp(opcode, insn->opcode, 2)) {
+			memcpy(opcode, insn->opcode, 2);
+			printf("\t/* %.2s */ \\\n", opcode);
+		}
+		print_opcode(insn, offset);
+		offset++;
+	}
+	printf("\t/* 1-byte opcode instructions */ \\\n");
+	for (i = 0; i < desc->nr; i++) {
+		insn = &desc->insn[i];
+		if (insn->type->byte != 0)
+			continue;
+		add_to_group(desc, insn, offset);
+		print_opcode(insn, offset);
+		offset++;
+	}
+	printf("}\n\n");
+}
+
+static void print_opcode_table_offsets(struct gen_opcode *desc)
+{
+	struct insn_group *group;
+	int i;
+
+	printf("#define OPCODE_OFFSET_INITIALIZER { \\\n");
+	for (i = 0; i < desc->nr_groups; i++) {
+		group = &desc->group[i];
+		printf("\t{ .opcode = 0x%.2s, .mask = 0x%02x, .byte = %d, .offset = %d, .count = %d }, \\\n",
+		       group->opcode, group->type->mask, group->type->byte, group->offset, group->count);
+	}
+	printf("}\n\n");
+}
+
+int main(int argc, char **argv)
+{
+	struct gen_opcode _desc = { 0 };
+	struct gen_opcode *desc = &_desc;
+
+	read_instructions(desc);
+	printf("#ifndef __S390_GENERATED_DIS_DEFS_H__\n");
+	printf("#define __S390_GENERATED_DIS_DEFS_H__\n");
+	printf("/*\n");
+	printf(" * DO NOT MODIFY.\n");
+	printf(" *\n");
+	printf(" * This file was generated by %s\n", __FILE__);
+	printf(" */\n\n");
+	print_formats(desc);
+	print_long_insn(desc);
+	print_opcode_table(desc);
+	print_opcode_table_offsets(desc);
+	printf("#endif\n");
+	exit(EXIT_SUCCESS);
+}

linux-7.2.3/arch/s390/tools/relocs.c

@@ -0,0 +1,387 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <stdio.h>
+#include <stdarg.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <inttypes.h>
+#include <string.h>
+#include <errno.h>
+#include <unistd.h>
+#include <elf.h>
+#include <byteswap.h>
+#define USE_BSD
+#include <endian.h>
+
+#define ELF_BITS 64
+
+#define ELF_MACHINE		EM_S390
+#define ELF_MACHINE_NAME	"IBM S/390"
+#define SHT_REL_TYPE		SHT_RELA
+#define Elf_Rel			Elf64_Rela
+
+#define ELF_CLASS		ELFCLASS64
+#define ELF_ENDIAN		ELFDATA2MSB
+#define ELF_R_SYM(val)		ELF64_R_SYM(val)
+#define ELF_R_TYPE(val)		ELF64_R_TYPE(val)
+#define ELF_ST_TYPE(o)		ELF64_ST_TYPE(o)
+#define ELF_ST_BIND(o)		ELF64_ST_BIND(o)
+#define ELF_ST_VISIBILITY(o)	ELF64_ST_VISIBILITY(o)
+
+#define ElfW(type)		_ElfW(ELF_BITS, type)
+#define _ElfW(bits, type)	__ElfW(bits, type)
+#define __ElfW(bits, type)	Elf##bits##_##type
+
+#define Elf_Addr		ElfW(Addr)
+#define Elf_Ehdr		ElfW(Ehdr)
+#define Elf_Phdr		ElfW(Phdr)
+#define Elf_Shdr		ElfW(Shdr)
+#define Elf_Sym			ElfW(Sym)
+
+static Elf_Ehdr		ehdr;
+static unsigned long	shnum;
+static unsigned int	shstrndx;
+
+struct relocs {
+	uint32_t	*offset;
+	unsigned long	count;
+	unsigned long	size;
+};
+
+static struct relocs relocs64;
+#define FMT PRIu64
+
+struct section {
+	Elf_Shdr	shdr;
+	struct section	*link;
+	Elf_Rel		*reltab;
+};
+
+static struct section *secs;
+
+#if BYTE_ORDER == LITTLE_ENDIAN
+#define le16_to_cpu(val)	(val)
+#define le32_to_cpu(val)	(val)
+#define le64_to_cpu(val)	(val)
+#define be16_to_cpu(val)	bswap_16(val)
+#define be32_to_cpu(val)	bswap_32(val)
+#define be64_to_cpu(val)	bswap_64(val)
+#endif
+
+#if BYTE_ORDER == BIG_ENDIAN
+#define le16_to_cpu(val)	bswap_16(val)
+#define le32_to_cpu(val)	bswap_32(val)
+#define le64_to_cpu(val)	bswap_64(val)
+#define be16_to_cpu(val)	(val)
+#define be32_to_cpu(val)	(val)
+#define be64_to_cpu(val)	(val)
+#endif
+
+static uint16_t elf16_to_cpu(uint16_t val)
+{
+	if (ehdr.e_ident[EI_DATA] == ELFDATA2LSB)
+		return le16_to_cpu(val);
+	else
+		return be16_to_cpu(val);
+}
+
+static uint32_t elf32_to_cpu(uint32_t val)
+{
+	if (ehdr.e_ident[EI_DATA] == ELFDATA2LSB)
+		return le32_to_cpu(val);
+	else
+		return be32_to_cpu(val);
+}
+
+#define elf_half_to_cpu(x)	elf16_to_cpu(x)
+#define elf_word_to_cpu(x)	elf32_to_cpu(x)
+
+static uint64_t elf64_to_cpu(uint64_t val)
+{
+	return be64_to_cpu(val);
+}
+
+#define elf_addr_to_cpu(x)	elf64_to_cpu(x)
+#define elf_off_to_cpu(x)	elf64_to_cpu(x)
+#define elf_xword_to_cpu(x)	elf64_to_cpu(x)
+
+static void die(char *fmt, ...)
+{
+	va_list ap;
+
+	va_start(ap, fmt);
+	vfprintf(stderr, fmt, ap);
+	va_end(ap);
+	exit(1);
+}
+
+static void read_ehdr(FILE *fp)
+{
+	if (fread(&ehdr, sizeof(ehdr), 1, fp) != 1)
+		die("Cannot read ELF header: %s\n", strerror(errno));
+	if (memcmp(ehdr.e_ident, ELFMAG, SELFMAG) != 0)
+		die("No ELF magic\n");
+	if (ehdr.e_ident[EI_CLASS] != ELF_CLASS)
+		die("Not a %d bit executable\n", ELF_BITS);
+	if (ehdr.e_ident[EI_DATA] != ELF_ENDIAN)
+		die("ELF endian mismatch\n");
+	if (ehdr.e_ident[EI_VERSION] != EV_CURRENT)
+		die("Unknown ELF version\n");
+
+	/* Convert the fields to native endian */
+	ehdr.e_type	 = elf_half_to_cpu(ehdr.e_type);
+	ehdr.e_machine	 = elf_half_to_cpu(ehdr.e_machine);
+	ehdr.e_version	 = elf_word_to_cpu(ehdr.e_version);
+	ehdr.e_entry	 = elf_addr_to_cpu(ehdr.e_entry);
+	ehdr.e_phoff	 = elf_off_to_cpu(ehdr.e_phoff);
+	ehdr.e_shoff	 = elf_off_to_cpu(ehdr.e_shoff);
+	ehdr.e_flags	 = elf_word_to_cpu(ehdr.e_flags);
+	ehdr.e_ehsize	 = elf_half_to_cpu(ehdr.e_ehsize);
+	ehdr.e_phentsize = elf_half_to_cpu(ehdr.e_phentsize);
+	ehdr.e_phnum	 = elf_half_to_cpu(ehdr.e_phnum);
+	ehdr.e_shentsize = elf_half_to_cpu(ehdr.e_shentsize);
+	ehdr.e_shnum	 = elf_half_to_cpu(ehdr.e_shnum);
+	ehdr.e_shstrndx  = elf_half_to_cpu(ehdr.e_shstrndx);
+
+	shnum = ehdr.e_shnum;
+	shstrndx = ehdr.e_shstrndx;
+
+	if ((ehdr.e_type != ET_EXEC) && (ehdr.e_type != ET_DYN))
+		die("Unsupported ELF header type\n");
+	if (ehdr.e_machine != ELF_MACHINE)
+		die("Not for %s\n", ELF_MACHINE_NAME);
+	if (ehdr.e_version != EV_CURRENT)
+		die("Unknown ELF version\n");
+	if (ehdr.e_ehsize != sizeof(Elf_Ehdr))
+		die("Bad Elf header size\n");
+	if (ehdr.e_phentsize != sizeof(Elf_Phdr))
+		die("Bad program header entry\n");
+	if (ehdr.e_shentsize != sizeof(Elf_Shdr))
+		die("Bad section header entry\n");
+
+	if (shnum == SHN_UNDEF || shstrndx == SHN_XINDEX) {
+		Elf_Shdr shdr;
+
+		if (fseek(fp, ehdr.e_shoff, SEEK_SET) < 0)
+			die("Seek to %" FMT " failed: %s\n", ehdr.e_shoff, strerror(errno));
+
+		if (fread(&shdr, sizeof(shdr), 1, fp) != 1)
+			die("Cannot read initial ELF section header: %s\n", strerror(errno));
+
+		if (shnum == SHN_UNDEF)
+			shnum = elf_xword_to_cpu(shdr.sh_size);
+
+		if (shstrndx == SHN_XINDEX)
+			shstrndx = elf_word_to_cpu(shdr.sh_link);
+	}
+
+	if (shstrndx >= shnum)
+		die("String table index out of bounds\n");
+}
+
+static void read_shdrs(FILE *fp)
+{
+	Elf_Shdr shdr;
+	int i;
+
+	secs = calloc(shnum, sizeof(struct section));
+	if (!secs)
+		die("Unable to allocate %ld section headers\n", shnum);
+
+	if (fseek(fp, ehdr.e_shoff, SEEK_SET) < 0)
+		die("Seek to %" FMT " failed: %s\n", ehdr.e_shoff, strerror(errno));
+
+	for (i = 0; i < shnum; i++) {
+		struct section *sec = &secs[i];
+
+		if (fread(&shdr, sizeof(shdr), 1, fp) != 1) {
+			die("Cannot read ELF section headers %d/%ld: %s\n",
+			    i, shnum, strerror(errno));
+		}
+
+		sec->shdr.sh_name      = elf_word_to_cpu(shdr.sh_name);
+		sec->shdr.sh_type      = elf_word_to_cpu(shdr.sh_type);
+		sec->shdr.sh_flags     = elf_xword_to_cpu(shdr.sh_flags);
+		sec->shdr.sh_addr      = elf_addr_to_cpu(shdr.sh_addr);
+		sec->shdr.sh_offset    = elf_off_to_cpu(shdr.sh_offset);
+		sec->shdr.sh_size      = elf_xword_to_cpu(shdr.sh_size);
+		sec->shdr.sh_link      = elf_word_to_cpu(shdr.sh_link);
+		sec->shdr.sh_info      = elf_word_to_cpu(shdr.sh_info);
+		sec->shdr.sh_addralign = elf_xword_to_cpu(shdr.sh_addralign);
+		sec->shdr.sh_entsize   = elf_xword_to_cpu(shdr.sh_entsize);
+
+		if (sec->shdr.sh_link < shnum)
+			sec->link = &secs[sec->shdr.sh_link];
+	}
+
+}
+
+static void read_relocs(FILE *fp)
+{
+	int i, j;
+
+	for (i = 0; i < shnum; i++) {
+		struct section *sec = &secs[i];
+
+		if (sec->shdr.sh_type != SHT_REL_TYPE)
+			continue;
+
+		sec->reltab = malloc(sec->shdr.sh_size);
+		if (!sec->reltab)
+			die("malloc of %" FMT " bytes for relocs failed\n", sec->shdr.sh_size);
+
+		if (fseek(fp, sec->shdr.sh_offset, SEEK_SET) < 0)
+			die("Seek to %" FMT " failed: %s\n", sec->shdr.sh_offset, strerror(errno));
+
+		if (fread(sec->reltab, 1, sec->shdr.sh_size, fp) != sec->shdr.sh_size)
+			die("Cannot read symbol table: %s\n", strerror(errno));
+
+		for (j = 0; j < sec->shdr.sh_size / sizeof(Elf_Rel); j++) {
+			Elf_Rel *rel = &sec->reltab[j];
+
+			rel->r_offset = elf_addr_to_cpu(rel->r_offset);
+			rel->r_info   = elf_xword_to_cpu(rel->r_info);
+#if (SHT_REL_TYPE == SHT_RELA)
+			rel->r_addend = elf_xword_to_cpu(rel->r_addend);
+#endif
+		}
+	}
+}
+
+static void add_reloc(struct relocs *r, uint32_t offset)
+{
+	if (r->count == r->size) {
+		unsigned long newsize = r->size + 50000;
+		void *mem = realloc(r->offset, newsize * sizeof(r->offset[0]));
+
+		if (!mem)
+			die("realloc of %ld entries for relocs failed\n", newsize);
+
+		r->offset = mem;
+		r->size = newsize;
+	}
+	r->offset[r->count++] = offset;
+}
+
+static int do_reloc(struct section *sec, Elf_Rel *rel)
+{
+	unsigned int r_type = ELF64_R_TYPE(rel->r_info);
+	ElfW(Addr) offset = rel->r_offset;
+
+	switch (r_type) {
+	case R_390_NONE:
+	case R_390_PC32:
+	case R_390_PC64:
+	case R_390_PC16DBL:
+	case R_390_PC32DBL:
+	case R_390_PLT32DBL:
+	case R_390_GOTENT:
+	case R_390_GOTPCDBL:
+	case R_390_GOTOFF64:
+		break;
+	case R_390_64:
+		add_reloc(&relocs64, offset);
+		break;
+	default:
+		die("Unsupported relocation type: %d\n", r_type);
+		break;
+	}
+
+	return 0;
+}
+
+static void walk_relocs(void)
+{
+	int i;
+
+	/* Walk through the relocations */
+	for (i = 0; i < shnum; i++) {
+		struct section *sec_applies;
+		int j;
+		struct section *sec = &secs[i];
+
+		if (sec->shdr.sh_type != SHT_REL_TYPE)
+			continue;
+
+		sec_applies = &secs[sec->shdr.sh_info];
+		if (!(sec_applies->shdr.sh_flags & SHF_ALLOC))
+			continue;
+
+		for (j = 0; j < sec->shdr.sh_size / sizeof(Elf_Rel); j++) {
+			Elf_Rel *rel = &sec->reltab[j];
+
+			do_reloc(sec, rel);
+		}
+	}
+}
+
+static int cmp_relocs(const void *va, const void *vb)
+{
+	const uint32_t *a, *b;
+
+	a = va; b = vb;
+	return (*a == *b) ? 0 : (*a > *b) ? 1 : -1;
+}
+
+static void sort_relocs(struct relocs *r)
+{
+	qsort(r->offset, r->count, sizeof(r->offset[0]), cmp_relocs);
+}
+
+static int print_reloc(uint32_t v)
+{
+	return fprintf(stdout, "\t.long 0x%08"PRIx32"\n", v) > 0 ? 0 : -1;
+}
+
+static void emit_relocs(void)
+{
+	int i;
+
+	walk_relocs();
+	sort_relocs(&relocs64);
+
+	printf(".section \".vmlinux.relocs_64\",\"a\"\n");
+	for (i = 0; i < relocs64.count; i++)
+		print_reloc(relocs64.offset[i]);
+}
+
+static void process(FILE *fp)
+{
+	read_ehdr(fp);
+	read_shdrs(fp);
+	read_relocs(fp);
+	emit_relocs();
+}
+
+static void usage(void)
+{
+	die("relocs vmlinux\n");
+}
+
+int main(int argc, char **argv)
+{
+	unsigned char e_ident[EI_NIDENT];
+	const char *fname;
+	FILE *fp;
+
+	fname = NULL;
+
+	if (argc != 2)
+		usage();
+
+	fname = argv[1];
+
+	fp = fopen(fname, "r");
+	if (!fp)
+		die("Cannot open %s: %s\n", fname, strerror(errno));
+
+	if (fread(&e_ident, 1, EI_NIDENT, fp) != EI_NIDENT)
+		die("Cannot read %s: %s", fname, strerror(errno));
+
+	rewind(fp);
+
+	process(fp);
+
+	fclose(fp);
+	return 0;
+}