[PATCH V2 01/11] arm64: Kexec: Add support for binary image
Pratyush Anand
panand at redhat.com
Wed May 13 22:55:37 PDT 2015
This patch adds support to use binary image ie arch/arm64/boot/Image.
Binary image does not have sufficient knowledge to extract page offset
information, which is needed by kexec tool. Use a new command parameter
--page-offset, so that user can provide page offset information for
linear mapping.
Signed-off-by: Pratyush Anand <panand at redhat.com>
---
kexec/arch/arm64/include/arch/options.h | 9 ++--
kexec/arch/arm64/kexec-arm64.c | 3 ++
kexec/arch/arm64/kexec-arm64.h | 2 +
kexec/arch/arm64/kexec-image-arm64.c | 86 +++++++++++++++++++++++++++++++--
4 files changed, 93 insertions(+), 7 deletions(-)
diff --git a/kexec/arch/arm64/include/arch/options.h b/kexec/arch/arm64/include/arch/options.h
index afe3e9827ff3..fa4ad2c68642 100644
--- a/kexec/arch/arm64/include/arch/options.h
+++ b/kexec/arch/arm64/include/arch/options.h
@@ -5,9 +5,10 @@
#define OPT_DTB ((OPT_MAX)+1)
#define OPT_INITRD ((OPT_MAX)+2)
#define OPT_LITE ((OPT_MAX)+3)
-#define OPT_PORT ((OPT_MAX)+4)
-#define OPT_REUSE_CMDLINE ((OPT_MAX+5))
-#define OPT_ARCH_MAX ((OPT_MAX)+6)
+#define OPT_PAGE_OFFSET ((OPT_MAX)+4)
+#define OPT_PORT ((OPT_MAX)+5)
+#define OPT_REUSE_CMDLINE ((OPT_MAX+6))
+#define OPT_ARCH_MAX ((OPT_MAX)+7)
#define KEXEC_ARCH_OPTIONS \
KEXEC_OPTIONS \
@@ -16,6 +17,7 @@
{ "dtb", 1, NULL, OPT_DTB }, \
{ "initrd", 1, NULL, OPT_INITRD }, \
{ "lite", 0, NULL, OPT_LITE }, \
+ { "page-offset", 1, NULL, OPT_PAGE_OFFSET }, \
{ "port", 1, NULL, OPT_PORT }, \
{ "ramdisk", 1, NULL, OPT_INITRD }, \
{ "reuse-cmdline", 0, NULL, OPT_REUSE_CMDLINE }, \
@@ -38,6 +40,7 @@ struct arm64_opts {
const char *command_line;
const char *dtb;
const char *initrd;
+ uint64_t page_offset;
uint64_t port;
int lite;
};
diff --git a/kexec/arch/arm64/kexec-arm64.c b/kexec/arch/arm64/kexec-arm64.c
index 6398e55fe575..86408598a465 100644
--- a/kexec/arch/arm64/kexec-arm64.c
+++ b/kexec/arch/arm64/kexec-arm64.c
@@ -100,6 +100,9 @@ int arch_process_options(int argc, char **argv)
case OPT_PORT:
arm64_opts.port = strtoull(optarg, NULL, 0);
break;
+ case OPT_PAGE_OFFSET:
+ arm64_opts.page_offset = strtoull(optarg, NULL, 0);
+ break;
default:
break; /* Ignore core and unknown options. */
}
diff --git a/kexec/arch/arm64/kexec-arm64.h b/kexec/arch/arm64/kexec-arm64.h
index 057acf313b49..7f0ca13fec11 100644
--- a/kexec/arch/arm64/kexec-arm64.h
+++ b/kexec/arch/arm64/kexec-arm64.h
@@ -17,6 +17,8 @@
#define BOOT_BLOCK_LAST_COMP_VERSION 16
#define COMMAND_LINE_SIZE 512
+#define ARM64_DEFAULT_PAGE_OFFSET 0xfffffe0000000000
+
int elf_arm64_probe(const char *kernel_buf, off_t kernel_size);
int elf_arm64_load(int argc, char **argv, const char *kernel_buf,
off_t kernel_size, struct kexec_info *info);
diff --git a/kexec/arch/arm64/kexec-image-arm64.c b/kexec/arch/arm64/kexec-image-arm64.c
index b025dc6c0185..c577b96d5e31 100644
--- a/kexec/arch/arm64/kexec-image-arm64.c
+++ b/kexec/arch/arm64/kexec-image-arm64.c
@@ -8,6 +8,7 @@
#include <errno.h>
#include <getopt.h>
#include <libfdt.h>
+#include <stdlib.h>
#include "dt-ops.h"
#include "image-header.h"
@@ -31,20 +32,97 @@ int image_arm64_probe(const char *kernel_buf, off_t kernel_size)
dbgprintf("%s: PE format: %s\n", __func__,
(arm64_header_check_pe_sig(h) ? "yes" : "no"));
- fprintf(stderr, "kexec: arm64 binary Image files are currently NOT SUPPORTED.\n");
+ return 0;
+}
+
+static unsigned long long get_kernel_text_sym(void)
+{
+ const char *kallsyms = "/proc/kallsyms";
+ const char *text = "_text";
+ char sym[128];
+ char line[128];
+ FILE *fp;
+ unsigned long long vaddr;
+ char type;
- return -1;
+ fp = fopen(kallsyms, "r"); if (!fp) {
+ fprintf(stderr, "Cannot open %s\n", kallsyms);
+ return 0;
+ }
+
+ while(fgets(line, sizeof(line), fp) != NULL) {
+ if (sscanf(line, "%Lx %c %s", &vaddr, &type, sym) != 3)
+ continue;
+ if (strcmp(sym, text) == 0) {
+ dbgprintf("kernel symbol %s vaddr = %16llx\n", text, vaddr);
+ return vaddr;
+ }
+ }
+
+ fprintf(stderr, "Cannot get kernel %s symbol address\n", text);
+ return 0;
+}
+
+static unsigned long long get_kernel_page_offset(void)
+{
+ unsigned long long text_sym_addr = get_kernel_text_sym();
+ unsigned long long text_page_offset =
+ text_sym_addr & 0xFFFFFFFFFFE00000;
+
+ if(arm64_opts.page_offset) {
+ if (text_page_offset != arm64_opts.page_offset)
+ dbgprintf("User page offset %lx did not match with text page offset %llx\n",
+ arm64_opts.page_offset, text_page_offset);
+ return arm64_opts.page_offset;
+ } else if(text_page_offset) {
+ dbgprintf("text page offset is %llx\n", text_page_offset);
+ return text_page_offset;
+ } else {
+ return ARM64_DEFAULT_PAGE_OFFSET;
+ }
}
int image_arm64_load(int argc, char **argv, const char *kernel_buf,
off_t kernel_size, struct kexec_info *info)
{
- return -ENOSYS;
+ int result;
+ uint64_t start;
+ const struct arm64_image_header *h;
+ char *header_option = NULL;
+
+ h = (const struct arm64_image_header *)(kernel_buf);
+
+ arm64_mem.text_offset = le64_to_cpu(h->text_offset);
+ arm64_mem.image_size = le64_to_cpu(h->image_size);
+
+ arm64_mem.page_offset = get_kernel_page_offset();
+
+ result = parse_iomem_single("Kernel code\n", &start, NULL);
+
+ if (result) {
+ fprintf(stderr, "kexec: Could not get kernel code address.\n");
+ return -1;
+ }
+ start -= arm64_mem.text_offset;
+
+ /* Add kernel */
+ add_segment_phys_virt(info, kernel_buf, kernel_size,
+ start + arm64_mem.text_offset,
+ kernel_size, 0);
+
+ info->entry = (void *)start + arm64_mem.text_offset;
+
+ result = arm64_load_other_segments(info, (unsigned long)info->entry);
+
+ if (header_option)
+ free(header_option);
+
+ return result;
}
void image_arm64_usage(void)
{
printf(
" An arm64 binary Image file, big or little endian.\n"
-" This file type is currently NOT SUPPORTED.\n\n");
+" --page-offset Kernel page-offset for binary image load.\n");
}
--
2.1.0
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