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For compatibility with an upcoming EDK2 feature that maps UEFI apps 

using strict permissions, emit the code as split .text/.data with
R-X/RW- permissions, respectively.

Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Nigel Croxon <ncroxon@redhat.com>
This commit is contained in:
Nigel Croxon 2017-02-15 19:54:32 -05:00
parent f164fd6785
commit 8581a58e5b
2 changed files with 24 additions and 33 deletions
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52
gnuefi/crt0-efi-aarch64.S
View File

@ -44,16 +44,16 @@ optional_header:
.short 0x20b // PE32+ format
.byte 0x02 // MajorLinkerVersion
.byte 0x14 // MinorLinkerVersion
.long _edata - _start // SizeOfCode
.long 0 // SizeOfInitializedData
.long _data - _start // SizeOfCode
.long _data_size // SizeOfInitializedData
.long 0 // SizeOfUninitializedData
.long _start - ImageBase // AddressOfEntryPoint
.long _start - ImageBase // BaseOfCode
extra_header_fields:
.quad 0 // ImageBase
.long 0x20 // SectionAlignment
.long 0x8 // FileAlignment
.long 0x1000 // SectionAlignment
.long 0x200 // FileAlignment
.short 0 // MajorOperatingSystemVersion
.short 0 // MinorOperatingSystemVersion
.short 0 // MajorImageVersion
@ -85,41 +85,31 @@ extra_header_fields:
// Section table
section_table:
/*
* The EFI application loader requires a relocation section
* because EFI applications must be relocatable. This is a
* dummy section as far as we are concerned.
*/
.ascii ".reloc"
.byte 0
.byte 0 // end of 0 padding of section name
.long 0
.long 0
.long 0 // SizeOfRawData
.long 0 // PointerToRawData
.long 0 // PointerToRelocations
.long 0 // PointerToLineNumbers
.short 0 // NumberOfRelocations
.short 0 // NumberOfLineNumbers
.long 0x42100040 // Characteristics (section flags)
.ascii ".text"
.byte 0
.byte 0
.byte 0 // end of 0 padding of section name
.long _edata - _start // VirtualSize
.ascii ".text\0\0\0"
.long _data - _start // VirtualSize
.long _start - ImageBase // VirtualAddress
.long _edata - _start // SizeOfRawData
.long _data - _start // SizeOfRawData
.long _start - ImageBase // PointerToRawData
.long 0 // PointerToRelocations (0 for executables)
.long 0 // PointerToLineNumbers (0 for executables)
.short 0 // NumberOfRelocations (0 for executables)
.short 0 // NumberOfLineNumbers (0 for executables)
.long 0xe0500020 // Characteristics (section flags)
.long 0x60000020 // Characteristics (section flags)
.ascii ".data\0\0\0"
.long _data_size // VirtualSize
.long _data - ImageBase // VirtualAddress
.long _data_size // SizeOfRawData
.long _data - ImageBase // PointerToRawData
.long 0 // PointerToRelocations (0 for executables)
.long 0 // PointerToLineNumbers (0 for executables)
.short 0 // NumberOfRelocations (0 for executables)
.short 0 // NumberOfLineNumbers (0 for executables)
.long 0xc0000040 // Characteristics (section flags)
.align 12
_start:
stp x29, x30, [sp, #-32]!
mov x29, sp

5
gnuefi/elf_aarch64_efi.lds
View File

@ -16,7 +16,7 @@ SECTIONS
_etext = .;
_text_size = . - _text;
.dynamic : { *(.dynamic) }
.data :
.data : ALIGN(4096)
{
_data = .;
*(.sdata)
@ -43,8 +43,9 @@ SECTIONS
.rela.plt : { *(.rela.plt) }
.rela.got : { *(.rela.got) }
.rela.data : { *(.rela.data) *(.rela.data*) }
. = ALIGN(512);
_edata = .;
_data_size = . - _etext;
_data_size = . - _data;
. = ALIGN(4096);
.dynsym : { *(.dynsym) }