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[efi] Allow for sections to be excluded from the generated PE file

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Hybrid bzImage and UEFI binaries (such as wimboot) include a bzImage
header within a section starting at offset zero, with the PE header
effectively occupying unused space within this section.  This section
should not appear as a named section in the resulting PE file.

Allow for the existence of hidden sections that do not result in a
section header being written to the PE file.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2023-04-10 16:55:28 +01:00
parent 9fb28080d9
commit bd13697446
1 changed files with 17 additions and 6 deletions
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23
src/util/elf2efi.c
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@@ -181,6 +181,7 @@ struct pe_section {
struct pe_section *next; struct pe_section *next;
EFI_IMAGE_SECTION_HEADER hdr; EFI_IMAGE_SECTION_HEADER hdr;
void ( * fixup ) ( struct pe_section *section ); void ( * fixup ) ( struct pe_section *section );
int hidden;
uint8_t contents[0]; uint8_t contents[0];
}; };
@@ -641,10 +642,12 @@ static struct pe_section * process_section ( struct elf_file *elf,
/* Update RVA limits */ /* Update RVA limits */
start = new->hdr.VirtualAddress; start = new->hdr.VirtualAddress;
end = ( start + new->hdr.Misc.VirtualSize ); end = ( start + new->hdr.Misc.VirtualSize );
if ( ( ! *applicable_start ) || ( *applicable_start >= start ) ) if ( ! new->hidden ) {
*applicable_start = start; if ( ( ! *applicable_start ) || ( *applicable_start >= start ) )
if ( *applicable_end < end ) *applicable_start = start;
*applicable_end = end; if ( *applicable_end < end )
*applicable_end = end;
}
if ( data_start < code_end ) if ( data_start < code_end )
data_start = code_end; data_start = code_end;
if ( data_mid < data_start ) if ( data_mid < data_start )
@@ -664,8 +667,11 @@ static struct pe_section * process_section ( struct elf_file *elf,
( data_end - data_mid ); ( data_end - data_mid );
/* Update remaining file header fields */ /* Update remaining file header fields */
pe_header->nt.FileHeader.NumberOfSections++; if ( ! new->hidden ) {
pe_header->nt.OptionalHeader.SizeOfHeaders += sizeof ( new->hdr ); pe_header->nt.FileHeader.NumberOfSections++;
pe_header->nt.OptionalHeader.SizeOfHeaders +=
sizeof ( new->hdr );
}
pe_header->nt.OptionalHeader.SizeOfImage = pe_header->nt.OptionalHeader.SizeOfImage =
efi_image_align ( data_end ); efi_image_align ( data_end );
@@ -935,6 +941,7 @@ static void write_pe_file ( struct pe_header *pe_header,
FILE *pe ) { FILE *pe ) {
struct pe_section *section; struct pe_section *section;
unsigned long fpos = 0; unsigned long fpos = 0;
unsigned int count = 0;
/* Align length of headers */ /* Align length of headers */
fpos = pe_header->nt.OptionalHeader.SizeOfHeaders = fpos = pe_header->nt.OptionalHeader.SizeOfHeaders =
@@ -962,12 +969,16 @@ static void write_pe_file ( struct pe_header *pe_header,
/* Write section headers */ /* Write section headers */
for ( section = pe_sections ; section ; section = section->next ) { for ( section = pe_sections ; section ; section = section->next ) {
if ( section->hidden )
continue;
if ( fwrite ( &section->hdr, sizeof ( section->hdr ), if ( fwrite ( &section->hdr, sizeof ( section->hdr ),
1, pe ) != 1 ) { 1, pe ) != 1 ) {
perror ( "Could not write section header" ); perror ( "Could not write section header" );
exit ( 1 ); exit ( 1 );
} }
count++;
} }
assert ( count == pe_header->nt.FileHeader.NumberOfSections );
/* Write sections */ /* Write sections */
for ( section = pe_sections ; section ; section = section->next ) { for ( section = pe_sections ; section ; section = section->next ) {