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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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6
hw/hppa/machine.c
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@ -135,8 +135,8 @@ static void machine_hppa_init(MachineState *machine)
exit(1);
}
size = load_elf(firmware_filename, NULL,
NULL, &firmware_entry, &firmware_low, &firmware_high,
size = load_elf(firmware_filename, NULL, NULL, NULL,
&firmware_entry, &firmware_low, &firmware_high,
true, EM_PARISC, 0, 0);
/* Unfortunately, load_elf sign-extends reading elf32. */
@ -165,7 +165,7 @@ static void machine_hppa_init(MachineState *machine)
/* Load kernel */
if (kernel_filename) {
size = load_elf(kernel_filename, &cpu_hppa_to_phys,
size = load_elf(kernel_filename, NULL, &cpu_hppa_to_phys,
NULL, &kernel_entry, &kernel_low, &kernel_high,
true, EM_PARISC, 0, 0);