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>
diff --git a/include/hw/loader.h b/include/hw/loader.h
index de8a296..3e1b3a4 100644
--- a/include/hw/loader.h
+++ b/include/hw/loader.h
@@ -93,6 +93,8 @@
/** load_elf_ram_sym:
* @filename: Path of ELF file
+ * @elf_note_fn: optional function to parse ELF Note type
+ * passed via @translate_opaque
* @translate_fn: optional function to translate load addresses
* @translate_opaque: opaque data passed to @translate_fn
* @pentry: Populated with program entry point. Ignored if NULL.
@@ -125,6 +127,7 @@
uint64_t st_value, uint64_t st_size);
int load_elf_ram_sym(const char *filename,
+ uint64_t (*elf_note_fn)(void *, void *, bool),
uint64_t (*translate_fn)(void *, uint64_t),
void *translate_opaque, uint64_t *pentry,
uint64_t *lowaddr, uint64_t *highaddr, int big_endian,
@@ -136,6 +139,7 @@
* symbol callback function
*/
int load_elf_ram(const char *filename,
+ uint64_t (*elf_note_fn)(void *, void *, bool),
uint64_t (*translate_fn)(void *, uint64_t),
void *translate_opaque, uint64_t *pentry, uint64_t *lowaddr,
uint64_t *highaddr, int big_endian, int elf_machine,
@@ -146,6 +150,7 @@
* Same as load_elf_ram(), but always loads the elf as ROM
*/
int load_elf_as(const char *filename,
+ uint64_t (*elf_note_fn)(void *, void *, bool),
uint64_t (*translate_fn)(void *, uint64_t),
void *translate_opaque, uint64_t *pentry, uint64_t *lowaddr,
uint64_t *highaddr, int big_endian, int elf_machine,
@@ -155,7 +160,9 @@
* Same as load_elf_as(), but doesn't allow the caller to specify an
* AddressSpace.
*/
-int load_elf(const char *filename, uint64_t (*translate_fn)(void *, uint64_t),
+int load_elf(const char *filename,
+ uint64_t (*elf_note_fn)(void *, void *, bool),
+ uint64_t (*translate_fn)(void *, uint64_t),
void *translate_opaque, uint64_t *pentry, uint64_t *lowaddr,
uint64_t *highaddr, int big_endian, int elf_machine,
int clear_lsb, int data_swab);
