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

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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>
This commit is contained in:
Liam Merwick 2019-01-15 12:18:03 +00:00 • committed by Paolo Bonzini
parent d455ebc4f8
commit 4366e1db16
41 changed files with 113 additions and 70 deletions
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2
include/hw/elf_ops.h
View file

@ -266,6 +266,7 @@ fail:
}
static int glue(load_elf, SZ)(const char *name, int fd,
uint64_t (*elf_note_fn)(void *, void *, bool),
uint64_t (*translate_fn)(void *, uint64_t),
void *translate_opaque,
int must_swab, uint64_t *pentry,
@ -498,6 +499,7 @@ static int glue(load_elf, SZ)(const char *name, int fd,
data = NULL;
}
}
g_free(phdr);
if (lowaddr)
*lowaddr = (uint64_t)(elf_sword)low;

9
include/hw/loader.h
View file

@ -93,6 +93,8 @@ const char *load_elf_strerror(int error);
/** 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 @@ typedef void (*symbol_fn_t)(const char *st_name, int st_info,
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 @@ int load_elf_ram_sym(const char *filename,
* 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 @@ int load_elf_ram(const char *filename,
* 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 @@ int load_elf_as(const char *filename,
* 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);