# HG changeset patch
# User Ian Campbell <ian.campbell@xxxxxxxxxxxxx>
# Node ID 58b5141c8309fdfe2069b98923686223d6fcbf2d
# Parent faadbf5ba8d6a823aa60b2a65f44cef0f576d3ce
[TOOLS] Add a simple tool to display the Xen specific ELF notes.
Signed-off-by: Ian Campbell <ian.campbell@xxxxxxxxxxxxx>
---
.hgignore | 1
tools/xcutils/Makefile | 2
tools/xcutils/readnotes.c | 307 ++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 309 insertions(+), 1 deletion(-)
diff -r faadbf5ba8d6 -r 58b5141c8309 .hgignore
--- a/.hgignore Wed Aug 23 14:41:05 2006 +0100
+++ b/.hgignore Wed Aug 23 14:43:48 2006 +0100
@@ -151,6 +151,7 @@
^tools/vtpm_manager/manager/vtpm_managerd$
^tools/xcutils/xc_restore$
^tools/xcutils/xc_save$
+^tools/xcutils/readnotes$
^tools/xenmon/xentrace_setmask$
^tools/xenmon/xenbaked$
^tools/xenstat/xentop/xentop$
diff -r faadbf5ba8d6 -r 58b5141c8309 tools/xcutils/Makefile
--- a/tools/xcutils/Makefile Wed Aug 23 14:41:05 2006 +0100
+++ b/tools/xcutils/Makefile Wed Aug 23 14:43:48 2006 +0100
@@ -26,7 +26,7 @@ CFLAGS += -Wp,-MD,.$(@F).d
CFLAGS += -Wp,-MD,.$(@F).d
PROG_DEP = .*.d
-PROGRAMS = xc_restore xc_save
+PROGRAMS = xc_restore xc_save readnotes
LDLIBS = -L$(XEN_LIBXC) -lxenguest -lxenctrl
diff -r faadbf5ba8d6 -r 58b5141c8309 tools/xcutils/readnotes.c
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/tools/xcutils/readnotes.c Wed Aug 23 14:43:48 2006 +0100
@@ -0,0 +1,307 @@
+#include <elf.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <inttypes.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/mman.h>
+
+#include <xen/elfnote.h>
+
+#define ELFNOTE_NAME(_n_) ((void*)(_n_) + sizeof(*(_n_)))
+#define ELFNOTE_DESC(_n_) (ELFNOTE_NAME(_n_) + (((_n_)->n_namesz+3)&~3))
+#define ELFNOTE_NEXT(_n_) (ELFNOTE_DESC(_n_) + (((_n_)->n_descsz+3)&~3))
+
+#if defined(__i386__)
+typedef Elf32_Ehdr Elf_Ehdr;
+typedef Elf32_Nhdr Elf_Nhdr;
+typedef Elf32_Half Elf_Half;
+typedef Elf32_Word Elf_Word;
+#elif defined(__x86_64__)
+typedef Elf64_Ehdr Elf_Ehdr;
+typedef Elf64_Nhdr Elf_Nhdr;
+typedef Elf64_Half Elf_Half;
+typedef Elf64_Word Elf_Word;
+#else
+#error "Unknown architecture"
+#endif
+
+static void print_string_note(const char *prefix, Elf_Nhdr *note)
+{
+ printf("%s: %s\n", prefix, (const char *)ELFNOTE_DESC(note));
+}
+
+static void print_numeric_note(const char *prefix,Elf_Nhdr *note)
+{
+ switch (note->n_descsz)
+ {
+ case 4:
+ printf("%s: %#010" PRIx32 " (4 bytes)\n",
+ prefix, *(uint32_t *)ELFNOTE_DESC(note));
+ break;
+ case 8:
+ printf("%s: %#018" PRIx64 " (8 bytes)\n",
+ prefix, *(uint64_t *)ELFNOTE_DESC(note));
+ break;
+ default:
+ printf("%s: unknown data size %#x\n", prefix, note->n_descsz);
+ break;
+ }
+}
+
+static inline unsigned char ehdr_class(void *image)
+{
+ Elf_Ehdr *ehdr = image;
+ switch (ehdr->e_ident[EI_CLASS])
+ {
+ case ELFCLASS32:
+ case ELFCLASS64:
+ return ehdr->e_ident[EI_CLASS];
+ break;
+ default:
+ fprintf(stderr, "Unknown ELF class %d\n",
+ ehdr->e_ident[EI_CLASS]);
+ exit(1);
+ }
+}
+
+static inline Elf_Half ehdr_shnum(void *image)
+{
+ switch (ehdr_class(image))
+ {
+ case ELFCLASS32:
+ return ((Elf32_Ehdr *)image)->e_shnum;
+ case ELFCLASS64:
+ return ((Elf64_Ehdr *)image)->e_shnum;
+ default:
+ exit(1);
+ }
+}
+
+static inline Elf_Word shdr_type(void *image, int shnum)
+{
+ switch (ehdr_class(image))
+ {
+ case ELFCLASS32:
+ {
+ Elf32_Ehdr *ehdr = (Elf32_Ehdr *)image;
+ Elf32_Shdr *shdr = (Elf32_Shdr*)(image + ehdr->e_shoff +
+ (shnum*ehdr->e_shentsize));
+ return shdr->sh_type;
+ }
+ case ELFCLASS64:
+ {
+ Elf64_Ehdr *ehdr = (Elf64_Ehdr *)image;
+ Elf64_Shdr *shdr = (Elf64_Shdr*)(image + ehdr->e_shoff +
+ (shnum*ehdr->e_shentsize));
+ return shdr->sh_type;
+ }
+ default:
+ exit(1);
+ }
+}
+
+static inline const char *shdr_name(void *image, int shnum)
+{
+ const char *shstrtab;
+
+ switch (ehdr_class(image))
+ {
+ case ELFCLASS32:
+ {
+ Elf32_Ehdr *ehdr = (Elf32_Ehdr *)image;
+ Elf32_Shdr *shdr;
+ /* Find the section-header strings table. */
+ if ( ehdr->e_shstrndx == SHN_UNDEF )
+ return NULL;
+ shdr = (Elf32_Shdr *)(image + ehdr->e_shoff +
+ (ehdr->e_shstrndx*ehdr->e_shentsize));
+ shstrtab = image + shdr->sh_offset;
+
+ shdr= (Elf32_Shdr*)(image + ehdr->e_shoff +
+ (shnum*ehdr->e_shentsize));
+ return &shstrtab[shdr->sh_name];
+ }
+ case ELFCLASS64:
+ {
+ Elf64_Ehdr *ehdr = (Elf64_Ehdr *)image;
+ Elf64_Shdr *shdr;
+ /* Find the section-header strings table. */
+ if ( ehdr->e_shstrndx == SHN_UNDEF )
+ return NULL;
+ shdr = (Elf64_Shdr *)(image + ehdr->e_shoff +
+ (ehdr->e_shstrndx*ehdr->e_shentsize));
+ shstrtab = image + shdr->sh_offset;
+
+ shdr= (Elf64_Shdr*)(image + ehdr->e_shoff +
+ (shnum*ehdr->e_shentsize));
+ return &shstrtab[shdr->sh_name];
+ }
+ default:
+ exit(1);
+ }
+}
+static inline void *shdr_start(void *image, int shnum)
+{
+ switch (ehdr_class(image))
+ {
+ case ELFCLASS32:
+ {
+ Elf32_Ehdr *ehdr = (Elf32_Ehdr *)image;
+ Elf32_Shdr *shdr = (Elf32_Shdr*)(image + ehdr->e_shoff +
+ (shnum*ehdr->e_shentsize));
+ return image + shdr->sh_offset;
+ }
+ case ELFCLASS64:
+ {
+ Elf64_Ehdr *ehdr = (Elf64_Ehdr *)image;
+ Elf64_Shdr *shdr = (Elf64_Shdr*)(image + ehdr->e_shoff +
+ (shnum*ehdr->e_shentsize));
+ return image + shdr->sh_offset;
+ }
+ default:
+ exit(1);
+ }
+}
+
+static inline void *shdr_end(void *image, int shnum)
+{
+ switch (ehdr_class(image))
+ {
+ case ELFCLASS32:
+ {
+ Elf32_Ehdr *ehdr = (Elf32_Ehdr *)image;
+ Elf32_Shdr *shdr = (Elf32_Shdr*)(image + ehdr->e_shoff +
+ (shnum*ehdr->e_shentsize));
+ return image + shdr->sh_offset + shdr->sh_size;
+ }
+ case ELFCLASS64:
+ {
+ Elf64_Ehdr *ehdr = (Elf64_Ehdr *)image;
+ Elf64_Shdr *shdr = (Elf64_Shdr*)(image + ehdr->e_shoff +
+ (shnum*ehdr->e_shentsize));
+ return image + shdr->sh_offset + shdr->sh_size;
+ }
+ default:
+ exit(1);
+ }
+}
+
+int main(int argc, char **argv)
+{
+ const char *f;
+ int fd,h;
+ void *image;
+ struct stat st;
+ Elf_Ehdr *ehdr;
+ Elf_Nhdr *note;
+
+ if (argc != 2)
+ {
+ fprintf(stderr, "Usage: readnotes <elfimage>\n");
+ return 1;
+ }
+ f = argv[1];
+
+ fd = open(f, O_RDONLY);
+ if (fd == -1)
+ {
+ fprintf(stderr, "Unable to open %s: %s\n", f, strerror(errno));
+ return 1;
+ }
+ if (fstat(fd, &st) == -1)
+ {
+ fprintf(stderr, "Unable to determine size of %s: %s\n",
+ f, strerror(errno));
+ return 1;
+ }
+
+ image = mmap(0, st.st_size, PROT_READ, MAP_SHARED, fd, 0);
+ if (image == MAP_FAILED)
+ {
+ fprintf(stderr, "Unable to map %s: %s\n", f, strerror(errno));
+ return 1;
+ }
+
+ ehdr = image;
+ if (ehdr->e_ident[EI_MAG0] != ELFMAG0 ||
+ ehdr->e_ident[EI_MAG1] != ELFMAG1 ||
+ ehdr->e_ident[EI_MAG2] != ELFMAG2 ||
+ ehdr->e_ident[EI_MAG3] != ELFMAG3)
+ {
+ fprintf(stderr, "File %s is not an ELF image\n", f);
+ return 1;
+ }
+
+ for ( h=0; h < ehdr_shnum(image); h++)
+ {
+ if (shdr_type(image,h) != SHT_NOTE)
+ continue;
+ for (note = (Elf_Nhdr*)shdr_start(image,h);
+ note < (Elf_Nhdr*)shdr_end(image,h);
+ note = (Elf_Nhdr*)(ELFNOTE_NEXT(note)))
+ {
+ switch(note->n_type)
+ {
+ case XEN_ELFNOTE_INFO:
+ print_string_note("INFO", note);
+ break;
+ case XEN_ELFNOTE_ENTRY:
+ print_numeric_note("ENTRY", note);
+ break;
+ case XEN_ELFNOTE_HYPERCALL_PAGE:
+ print_numeric_note("HYPERCALL_PAGE", note);
+ break;
+ case XEN_ELFNOTE_VIRT_BASE:
+ print_numeric_note("VIRT_BASE", note);
+ break;
+ case XEN_ELFNOTE_PADDR_OFFSET:
+ print_numeric_note("PADDR_OFFSET", note);
+ break;
+ case XEN_ELFNOTE_XEN_VERSION:
+ print_string_note("XEN_VERSION", note);
+ break;
+ case XEN_ELFNOTE_GUEST_OS:
+ print_string_note("GUEST_OS", note);
+ break;
+ case XEN_ELFNOTE_GUEST_VERSION:
+ print_string_note("GUEST_VERSION", note);
+ break;
+ case XEN_ELFNOTE_LOADER:
+ print_string_note("LOADER", note);
+ break;
+ case XEN_ELFNOTE_PAE_MODE:
+ print_string_note("PAE_MODE", note);
+ break;
+ case XEN_ELFNOTE_FEATURES:
+ print_string_note("FEATURES", note);
+ break;
+ default:
+ printf("unknown note type %#x\n", note->n_type);
+ break;
+ }
+ }
+ }
+
+ for ( h=0; h < ehdr_shnum(image); h++)
+ {
+ const char *name = shdr_name(image,h);
+
+ if ( name == NULL )
+ continue;
+ if ( strcmp(name, "__xen_guest") != 0 )
+ continue;
+
+ printf("__xen_guest: %s\n", (const char *)shdr_start(image, h));
+ break;
+ }
+
+ return 0;
+}
+
+
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