elf: Add optional function ptr to load_elf() to parse ELF notes

This patch adds an optional function pointer, 'elf_note_fn', to
load_elf() which causes load_elf() to additionally parse any
ELF program headers of type PT_NOTE and check to see if the ELF
Note is of the type specified by the 'translate_opaque' arg.
If a matching ELF Note is found then the specfied function pointer
is called to process the ELF note.

Passing a NULL function pointer results in ELF Notes being skipped.

The first consumer of this functionality is the PVHboot support
which needs to read the XEN_ELFNOTE_PHYS32_ENTRY ELF Note while
loading the uncompressed kernel binary in order to discover the
boot entry address for the x86/HVM direct boot ABI.

Signed-off-by: Liam Merwick <liam.merwick@oracle.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/hw/sparc64/sun4u.c b/hw/sparc64/sun4u.c
index f76b19e4e9..b9bd4be5d5 100644
--- a/hw/sparc64/sun4u.c
+++ b/hw/sparc64/sun4u.c
@@ -153,7 +153,7 @@ static uint64_t sun4u_load_kernel(const char *kernel_filename,
 #else
         bswap_needed = 0;
 #endif
-        kernel_size = load_elf(kernel_filename, NULL, NULL, kernel_entry,
+        kernel_size = load_elf(kernel_filename, NULL, NULL, NULL, kernel_entry,
                                kernel_addr, &kernel_top, 1, EM_SPARCV9, 0, 0);
         if (kernel_size < 0) {
             *kernel_addr = KERNEL_LOAD_ADDR;
@@ -411,7 +411,7 @@ static void prom_init(hwaddr addr, const char *bios_name)
     }
     filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, bios_name);
     if (filename) {
-        ret = load_elf(filename, translate_prom_address, &addr,
+        ret = load_elf(filename, NULL, translate_prom_address, &addr,
                        NULL, NULL, NULL, 1, EM_SPARCV9, 0, 0);
         if (ret < 0 || ret > PROM_SIZE_MAX) {
             ret = load_image_targphys(filename, addr, PROM_SIZE_MAX);