kexec support for Linux/m68k (tools part)

index e44fcebbd32b..e2da50b54c91 100644
@@ -121,7 +121,7 @@ static int get_kernel_vaddr_and_size(struct kexec_info *UNUSED(info),
 	struct mem_ehdr ehdr;
 	struct mem_phdr *phdr, *end_phdr;
 	int align;
-	unsigned long size;
+	off_t size;
 	uint32_t elf_flags = 0;
 
 	if (elf_info->machine != EM_X86_64)

@@ -131,8 +131,7 @@ static int get_kernel_vaddr_and_size(struct kexec_info *UNUSED(info),
 		return 0;
 
 	align = getpagesize();
-	size = KCORE_ELF_HEADERS_SIZE;
-	buf = slurp_file_len(kcore, size);
+	buf = slurp_file_len(kcore, KCORE_ELF_HEADERS_SIZE, &size);
 	if (!buf) {
 		fprintf(stderr, "Cannot read %s: %s\n", kcore, strerror(errno));
 		return -1;

index 2ce570f7bb43..185c85bef342 100644
@@ -537,7 +537,7 @@ char *slurp_file(const char *filename, off_t *r_size)
 /* This functions reads either specified number of bytes from the file or
    lesser if EOF is met. */
 
-char *slurp_file_len(const char *filename, off_t size)
+char *slurp_file_len(const char *filename, off_t size, off_t *nread)
 {
 	int fd;
 	char *buf;

@@ -575,6 +575,8 @@ char *slurp_file_len(const char *filename, off_t size)
 		die("Close of %s failed: %s\n",
 			filename, strerror(errno));
 	}
+	if (nread)
+		*nread = progress;
 	return buf;
 }
 

index 2904e03c79b8..8d5b512e365f 100644
@@ -237,7 +237,7 @@ extern void die(const char *fmt, ...)
 extern void *xmalloc(size_t size);
 extern void *xrealloc(void *ptr, size_t size);
 extern char *slurp_file(const char *filename, off_t *r_size);
-extern char *slurp_file_len(const char *filename, off_t size);
+extern char *slurp_file_len(const char *filename, off_t size, off_t *nread);
 extern char *slurp_decompress_file(const char *filename, off_t *r_size);
 extern unsigned long virt_to_phys(unsigned long addr);
 extern void add_segment(struct kexec_info *info,

index 185c85bef342..583a35a24a70 100644
@@ -469,14 +469,46 @@ static int add_backup_segments(struct kexec_info *info,
 	return 0;
 }
 
+static char *slurp_fd(int fd, const char *filename, off_t size, off_t *nread)
+{
+	char *buf;
+	off_t progress;
+	ssize_t result;
+
+	buf = xmalloc(size);
+	progress = 0;
+	while (progress < size) {
+		result = read(fd, buf + progress, size - progress);
+		if (result < 0) {
+			if ((errno == EINTR) ||	(errno == EAGAIN))
+				continue;
+			fprintf(stderr, "Read on %s failed: %s\n", filename,
+				strerror(errno));
+			free(buf);
+			close(fd);
+			return NULL;
+		}
+		if (result == 0)
+			/* EOF */
+			break;
+		progress += result;
+	}
+	result = close(fd);
+	if (result < 0)
+		die("Close of %s failed: %s\n", filename, strerror(errno));
+
+	if (nread)
+		*nread = progress;
+	return buf;
+}
+
 char *slurp_file(const char *filename, off_t *r_size)
 {
 	int fd;
 	char *buf;
-	off_t size, progress, err;
+	off_t size, err, nread;
 	ssize_t result;
 	struct stat stats;
-	
 
 	if (!filename) {
 		*r_size = 0;

@@ -512,25 +544,14 @@ char *slurp_file(const char *filename, off_t *r_size)
 		size = stats.st_size;
 	}
 
+	buf = slurp_fd(fd, filename, size, &nread);
+	if (!buf)
+		die("Cannot read %s", filename);
+
+	if (nread != size)
+		die("Read on %s ended before stat said it should\n", filename);
+
 	*r_size = size;
-	buf = xmalloc(size);
-	progress = 0;
-	while(progress < size) {
-		result = read(fd, buf + progress, size - progress);
-		if (result < 0) {
-			if ((errno == EINTR) ||	(errno == EAGAIN))
-				continue;
-			die("read on %s of %ld bytes failed: %s\n", filename,
-			    (size - progress)+ 0UL, strerror(errno));
-		}
-		if (result == 0)
-			die("read on %s ended before stat said it should\n", filename);
-		progress += result;
-	}
-	result = close(fd);
-	if (result < 0) {
-		die("Close of %s failed: %s\n", filename, strerror(errno));
-	}
 	return buf;
 }
 

@@ -540,9 +561,6 @@ char *slurp_file(const char *filename, off_t *r_size)
 char *slurp_file_len(const char *filename, off_t size, off_t *nread)
 {
 	int fd;
-	char *buf;
-	off_t progress;
-	ssize_t result;
 
 	if (!filename)
 		return 0;

@@ -552,32 +570,8 @@ char *slurp_file_len(const char *filename, off_t size, off_t *nread)
 				strerror(errno));
 		return 0;
 	}
-	buf = xmalloc(size);
-	progress = 0;
-	while(progress < size) {
-		result = read(fd, buf + progress, size - progress);
-		if (result < 0) {
-			if ((errno == EINTR) ||	(errno == EAGAIN))
-				continue;
-			fprintf(stderr, "read on %s of %ld bytes failed: %s\n",
-					filename, (size - progress)+ 0UL,
-					strerror(errno));
-			free(buf);
-			return 0;
-		}
-		if (result == 0)
-			/* EOF */
-			break;
-		progress += result;
-	}
-	result = close(fd);
-	if (result < 0) {
-		die("Close of %s failed: %s\n",
-			filename, strerror(errno));
-	}
-	if (nread)
-		*nread = progress;
-	return buf;
+
+	return slurp_fd(fd, filename, size, nread);
 }
 
 char *slurp_decompress_file(const char *filename, off_t *r_size)

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new file mode 100644
index 000000000000..fa12a1670149
@@ -0,0 +1,37 @@
+/*
+ * kexec-elf-rel-m68k.c - kexec Elf relocation routines
+ *
+ * Copyright (C) 2013 Geert Uytterhoeven
+ *
+ * This source code is licensed under the GNU General Public License,
+ * Version 2.  See the file COPYING for more details.
+*/
+
+#include <stdio.h>
+#include <elf.h>
+#include "../../kexec.h"
+#include "../../kexec-elf.h"
+
+int machine_verify_elf_rel(struct mem_ehdr *ehdr)
+{
+	if (ehdr->ei_data != ELFDATA2MSB)
+		return 0;
+	if (ehdr->ei_class != ELFCLASS32)
+		return 0;
+	if (ehdr->e_machine != EM_68K)
+		return 0;
+	return 1;
+}
+
+void machine_apply_elf_rel(struct mem_ehdr *UNUSED(ehdr), unsigned long r_type,
+			   void *UNUSED(location),
+			   unsigned long UNUSED(address),
+			   unsigned long UNUSED(value))
+{
+	switch (r_type) {
+	default:
+		die("Unknown rela relocation: %lu\n", r_type);
+		break;
+	}
+	return;
+}

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new file mode 100644
index 000000000000..99482c49db96
@@ -0,0 +1,9 @@
+#ifndef KEXEC_M68K_H
+#define KEXEC_M68K_H
+
+int elf_m68k_probe(const char *buf, off_t len);
+int elf_m68k_load(int argc, char **argv, const char *buf, off_t len,
+		  struct kexec_info *info);
+void elf_m68k_usage(void);
+
+#endif /* KEXEC_M68K_H */

index b56cb00feadc..6238044198e5 100644
@@ -45,6 +45,9 @@
 #if defined(__mips__)
 #define __NR_kexec_load                4311
 #endif
+#ifdef __m68k__
+#define __NR_kexec_load                313
+#endif
 #ifndef __NR_kexec_load
 #error Unknown processor architecture.  Needs a kexec_load syscall number.
 #endif

@@ -67,6 +70,7 @@ static inline long kexec_load(void *entry, unsigned long nr_segments,
  */
 #define KEXEC_ARCH_DEFAULT ( 0 << 16)
 #define KEXEC_ARCH_386     ( 3 << 16)
+#define KEXEC_ARCH_68K     ( 4 << 16)
 #define KEXEC_ARCH_X86_64  (62 << 16)
 #define KEXEC_ARCH_PPC     (20 << 16)
 #define KEXEC_ARCH_PPC64   (21 << 16)

@@ -114,5 +118,8 @@ static inline long kexec_load(void *entry, unsigned long nr_segments,
 #if defined(__mips__)
 #define KEXEC_ARCH_NATIVE	KEXEC_ARCH_MIPS
 #endif
+#ifdef __m68k__
+#define KEXEC_ARCH_NATIVE	KEXEC_ARCH_68K
+#endif
 
 #endif /* KEXEC_SYSCALL_H */