diff options
Diffstat (limited to 'arch/arm/boot/compressed')
| -rw-r--r-- | arch/arm/boot/compressed/Makefile | 15 | ||||
| -rw-r--r-- | arch/arm/boot/compressed/efi-header.S | 130 | ||||
| -rw-r--r-- | arch/arm/boot/compressed/head.S | 54 | ||||
| -rw-r--r-- | arch/arm/boot/compressed/vmlinux.lds.S | 7 |
4 files changed, 203 insertions, 3 deletions
diff --git a/arch/arm/boot/compressed/Makefile b/arch/arm/boot/compressed/Makefile index 3f9a9ebc7..43788b1a1 100644 --- a/arch/arm/boot/compressed/Makefile +++ b/arch/arm/boot/compressed/Makefile @@ -106,6 +106,15 @@ ORIG_CFLAGS := $(KBUILD_CFLAGS) KBUILD_CFLAGS = $(subst -pg, , $(ORIG_CFLAGS)) endif +# -fstack-protector-strong triggers protection checks in this code, +# but it is being used too early to link to meaningful stack_chk logic. +nossp_flags := $(call cc-option, -fno-stack-protector) +CFLAGS_atags_to_fdt.o := $(nossp_flags) +CFLAGS_fdt.o := $(nossp_flags) +CFLAGS_fdt_ro.o := $(nossp_flags) +CFLAGS_fdt_rw.o := $(nossp_flags) +CFLAGS_fdt_wip.o := $(nossp_flags) + ccflags-y := -fpic -mno-single-pic-base -fno-builtin -I$(obj) asflags-y := -DZIMAGE @@ -167,9 +176,11 @@ if [ $(words $(ZRELADDR)) -gt 1 -a "$(CONFIG_AUTO_ZRELADDR)" = "" ]; then \ false; \ fi +efi-obj-$(CONFIG_EFI_STUB) := $(objtree)/drivers/firmware/efi/libstub/lib.a + $(obj)/vmlinux: $(obj)/vmlinux.lds $(obj)/$(HEAD) $(obj)/piggy.$(suffix_y).o \ $(addprefix $(obj)/, $(OBJS)) $(lib1funcs) $(ashldi3) \ - $(bswapsdi2) FORCE + $(bswapsdi2) $(efi-obj-y) FORCE @$(check_for_multiple_zreladdr) $(call if_changed,ld) @$(check_for_bad_syms) @@ -184,5 +195,7 @@ CFLAGS_font.o := -Dstatic= $(obj)/font.c: $(FONTC) $(call cmd,shipped) +AFLAGS_hyp-stub.o := -Wa,-march=armv7-a + $(obj)/hyp-stub.S: $(srctree)/arch/$(SRCARCH)/kernel/hyp-stub.S $(call cmd,shipped) diff --git a/arch/arm/boot/compressed/efi-header.S b/arch/arm/boot/compressed/efi-header.S new file mode 100644 index 000000000..9d5dc4fda --- /dev/null +++ b/arch/arm/boot/compressed/efi-header.S @@ -0,0 +1,130 @@ +/* + * Copyright (C) 2013-2015 Linaro Ltd + * Authors: Roy Franz <roy.franz@linaro.org> + * Ard Biesheuvel <ard.biesheuvel@linaro.org> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + + .macro __nop +#ifdef CONFIG_EFI_STUB + @ This is almost but not quite a NOP, since it does clobber the + @ condition flags. But it is the best we can do for EFI, since + @ PE/COFF expects the magic string "MZ" at offset 0, while the + @ ARM/Linux boot protocol expects an executable instruction + @ there. + .inst 'M' | ('Z' << 8) | (0x1310 << 16) @ tstne r0, #0x4d000 +#else + mov r0, r0 +#endif + .endm + + .macro __EFI_HEADER +#ifdef CONFIG_EFI_STUB + b __efi_start + + .set start_offset, __efi_start - start + .org start + 0x3c + @ + @ The PE header can be anywhere in the file, but for + @ simplicity we keep it together with the MSDOS header + @ The offset to the PE/COFF header needs to be at offset + @ 0x3C in the MSDOS header. + @ The only 2 fields of the MSDOS header that are used are this + @ PE/COFF offset, and the "MZ" bytes at offset 0x0. + @ + .long pe_header - start @ Offset to the PE header. + +pe_header: + .ascii "PE\0\0" + +coff_header: + .short 0x01c2 @ ARM or Thumb + .short 2 @ nr_sections + .long 0 @ TimeDateStamp + .long 0 @ PointerToSymbolTable + .long 1 @ NumberOfSymbols + .short section_table - optional_header + @ SizeOfOptionalHeader + .short 0x306 @ Characteristics. + @ IMAGE_FILE_32BIT_MACHINE | + @ IMAGE_FILE_DEBUG_STRIPPED | + @ IMAGE_FILE_EXECUTABLE_IMAGE | + @ IMAGE_FILE_LINE_NUMS_STRIPPED + +optional_header: + .short 0x10b @ PE32 format + .byte 0x02 @ MajorLinkerVersion + .byte 0x14 @ MinorLinkerVersion + .long _end - __efi_start @ SizeOfCode + .long 0 @ SizeOfInitializedData + .long 0 @ SizeOfUninitializedData + .long efi_stub_entry - start @ AddressOfEntryPoint + .long start_offset @ BaseOfCode + .long 0 @ data + +extra_header_fields: + .long 0 @ ImageBase + .long 0x200 @ SectionAlignment + .long 0x200 @ FileAlignment + .short 0 @ MajorOperatingSystemVersion + .short 0 @ MinorOperatingSystemVersion + .short 0 @ MajorImageVersion + .short 0 @ MinorImageVersion + .short 0 @ MajorSubsystemVersion + .short 0 @ MinorSubsystemVersion + .long 0 @ Win32VersionValue + + .long _end - start @ SizeOfImage + .long start_offset @ SizeOfHeaders + .long 0 @ CheckSum + .short 0xa @ Subsystem (EFI application) + .short 0 @ DllCharacteristics + .long 0 @ SizeOfStackReserve + .long 0 @ SizeOfStackCommit + .long 0 @ SizeOfHeapReserve + .long 0 @ SizeOfHeapCommit + .long 0 @ LoaderFlags + .long 0x6 @ NumberOfRvaAndSizes + + .quad 0 @ ExportTable + .quad 0 @ ImportTable + .quad 0 @ ResourceTable + .quad 0 @ ExceptionTable + .quad 0 @ CertificationTable + .quad 0 @ BaseRelocationTable + +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\0\0" + .long 0 @ VirtualSize + .long 0 @ VirtualAddress + .long 0 @ SizeOfRawData + .long 0 @ PointerToRawData + .long 0 @ PointerToRelocations + .long 0 @ PointerToLineNumbers + .short 0 @ NumberOfRelocations + .short 0 @ NumberOfLineNumbers + .long 0x42100040 @ Characteristics + + .ascii ".text\0\0\0" + .long _end - __efi_start @ VirtualSize + .long __efi_start @ VirtualAddress + .long _edata - __efi_start @ SizeOfRawData + .long __efi_start @ PointerToRawData + .long 0 @ PointerToRelocations + .long 0 @ PointerToLineNumbers + .short 0 @ NumberOfRelocations + .short 0 @ NumberOfLineNumbers + .long 0xe0500020 @ Characteristics + + .align 9 +__efi_start: +#endif + .endm diff --git a/arch/arm/boot/compressed/head.S b/arch/arm/boot/compressed/head.S index 06e983f59..af11c2f8f 100644 --- a/arch/arm/boot/compressed/head.S +++ b/arch/arm/boot/compressed/head.S @@ -12,6 +12,8 @@ #include <asm/assembler.h> #include <asm/v7m.h> +#include "efi-header.S" + AR_CLASS( .arch armv7-a ) M_CLASS( .arch armv7-m ) @@ -126,7 +128,7 @@ start: .type start,#function .rept 7 - mov r0, r0 + __nop .endr ARM( mov r0, r0 ) ARM( b 1f ) @@ -139,7 +141,8 @@ start: .word 0x04030201 @ endianness flag THUMB( .thumb ) -1: +1: __EFI_HEADER + ARM_BE8( setend be ) @ go BE8 if compiled for BE8 AR_CLASS( mrs r9, cpsr ) #ifdef CONFIG_ARM_VIRT_EXT @@ -1353,6 +1356,53 @@ __enter_kernel: reloc_code_end: +#ifdef CONFIG_EFI_STUB + .align 2 +_start: .long start - . + +ENTRY(efi_stub_entry) + @ allocate space on stack for passing current zImage address + @ and for the EFI stub to return of new entry point of + @ zImage, as EFI stub may copy the kernel. Pointer address + @ is passed in r2. r0 and r1 are passed through from the + @ EFI firmware to efi_entry + adr ip, _start + ldr r3, [ip] + add r3, r3, ip + stmfd sp!, {r3, lr} + mov r2, sp @ pass zImage address in r2 + bl efi_entry + + @ Check for error return from EFI stub. r0 has FDT address + @ or error code. + cmn r0, #1 + beq efi_load_fail + + @ Preserve return value of efi_entry() in r4 + mov r4, r0 + bl cache_clean_flush + bl cache_off + + @ Set parameters for booting zImage according to boot protocol + @ put FDT address in r2, it was returned by efi_entry() + @ r1 is the machine type, and r0 needs to be 0 + mov r0, #0 + mov r1, #0xFFFFFFFF + mov r2, r4 + + @ Branch to (possibly) relocated zImage that is in [sp] + ldr lr, [sp] + ldr ip, =start_offset + add lr, lr, ip + mov pc, lr @ no mode switch + +efi_load_fail: + @ Return EFI_LOAD_ERROR to EFI firmware on error. + ldr r0, =0x80000001 + ldmfd sp!, {ip, pc} +ENDPROC(efi_stub_entry) +#endif + .align .section ".stack", "aw", %nobits .L_user_stack: .space 4096 diff --git a/arch/arm/boot/compressed/vmlinux.lds.S b/arch/arm/boot/compressed/vmlinux.lds.S index 2b60b843a..81c493156 100644 --- a/arch/arm/boot/compressed/vmlinux.lds.S +++ b/arch/arm/boot/compressed/vmlinux.lds.S @@ -48,6 +48,13 @@ SECTIONS *(.rodata) *(.rodata.*) } + .data : { + /* + * The EFI stub always executes from RAM, and runs strictly before the + * decompressor, so we can make an exception for its r/w data, and keep it + */ + *(.data.efistub) + } .piggydata : { *(.piggydata) } |