Arvind Sankar 41d90b0c11 efi/x86: Setup stack correctly for efi_pe_entry ... Commit 17054f492d ("efi/x86: Implement mixed mode boot without the handover protocol") introduced a new entry point for the EFI stub to be booted in mixed mode on 32-bit firmware. When entered via efi32_pe_entry, control is first transferred to startup_32 to setup for the switch to long mode, and then the EFI stub proper is entered via efi_pe_entry. efi_pe_entry is an MS ABI function, and the ABI requires 32 bytes of shadow stack space to be allocated by the caller, as well as the stack being aligned to 8 mod 16 on entry. Allocate 40 bytes on the stack before switching to 64-bit mode when calling efi_pe_entry to account for this. For robustness, explicitly align boot_stack_end to 16 bytes. It is currently implicitly aligned since .bss is cacheline-size aligned, head_64.o is the first object file with a .bss section, and the heap and boot sizes are aligned. Fixes: 17054f492d ("efi/x86: Implement mixed mode boot without the handover protocol") Signed-off-by: Arvind Sankar <nivedita@alum.mit.edu> Link: https://lore.kernel.org/r/20200617131957.2507632-1-nivedita@alum.mit.edu Signed-off-by: Ard Biesheuvel <ardb@kernel.org>		2020-06-17 15:28:58 +02:00
..
boot	efi/x86: Setup stack correctly for efi_pe_entry	2020-06-17 15:28:58 +02:00
configs
crypto
entry	The X86 entry, exception and interrupt code rework	2020-06-13 10:05:47 -07:00
events	treewide: replace '---help---' in Kconfig files with 'help'	2020-06-14 01:57:21 +09:00
hyperv	x86/entry: Convert various hypervisor vectors to IDTENTRY_SYSVEC	2020-06-11 15:15:15 +02:00
ia32
include	RAS updates from Borislav Petkov:	2020-06-13 10:21:00 -07:00
kernel	RAS updates from Borislav Petkov:	2020-06-13 10:21:00 -07:00
kvm	Kbuild updates for v5.8 (2nd)	2020-06-13 13:29:16 -07:00
lib	Rebase locking/kcsan to locking/urgent	2020-06-11 20:02:46 +02:00
math-emu
mm	The X86 entry, exception and interrupt code rework	2020-06-13 10:05:47 -07:00
net
oprofile
pci
platform	x86/entry: Convert various system vectors	2020-06-11 15:15:14 +02:00
power
purgatory
ras	treewide: replace '---help---' in Kconfig files with 'help'	2020-06-14 01:57:21 +09:00
realmode	Rebase locking/kcsan to locking/urgent	2020-06-11 20:02:46 +02:00
tools
um
video
xen	xen: Move xen_setup_callback_vector() definition to include/xen/hvm.h	2020-06-11 15:15:19 +02:00
.gitignore
Kbuild
Kconfig	Kbuild updates for v5.8 (2nd)	2020-06-13 13:29:16 -07:00
Kconfig.assembler
Kconfig.cpu	treewide: replace '---help---' in Kconfig files with 'help'	2020-06-14 01:57:21 +09:00
Kconfig.debug	treewide: replace '---help---' in Kconfig files with 'help'	2020-06-14 01:57:21 +09:00
Makefile
Makefile.um
Makefile_32.cpu