diff options
| author | Ard Biesheuvel <ard.biesheuvel@linaro.org> | 2015-10-08 20:02:04 +0100 |
|---|---|---|
| committer | Catalin Marinas <catalin.marinas@arm.com> | 2015-10-12 16:20:12 +0100 |
| commit | e8f3010f7326c00368dbc057bd052bec80dfc072 (patch) | |
| tree | 111ad1d750410588ecd346fc257c05565963f0fd /arch/arm64/kernel/efi-entry.S | |
| parent | 207918461eb0aca720fddec5da79bc71c133b9f1 (diff) | |
arm64/efi: isolate EFI stub from the kernel proper
Since arm64 does not use a builtin decompressor, the EFI stub is built
into the kernel proper. So far, this has been working fine, but actually,
since the stub is in fact a PE/COFF relocatable binary that is executed
at an unknown offset in the 1:1 mapping provided by the UEFI firmware, we
should not be seamlessly sharing code with the kernel proper, which is a
position dependent executable linked at a high virtual offset.
So instead, separate the contents of libstub and its dependencies, by
putting them into their own namespace by prefixing all of its symbols
with __efistub. This way, we have tight control over what parts of the
kernel proper are referenced by the stub.
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Reviewed-by: Matt Fleming <matt.fleming@intel.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'arch/arm64/kernel/efi-entry.S')
| -rw-r--r-- | arch/arm64/kernel/efi-entry.S | 10 |
1 files changed, 5 insertions, 5 deletions
diff --git a/arch/arm64/kernel/efi-entry.S b/arch/arm64/kernel/efi-entry.S index 8ce9b0577442..a773db92908b 100644 --- a/arch/arm64/kernel/efi-entry.S +++ b/arch/arm64/kernel/efi-entry.S @@ -29,7 +29,7 @@ * we want to be. The kernel image wants to be placed at TEXT_OFFSET * from start of RAM. */ -ENTRY(efi_stub_entry) +ENTRY(entry) /* * Create a stack frame to save FP/LR with extra space * for image_addr variable passed to efi_entry(). @@ -86,8 +86,8 @@ ENTRY(efi_stub_entry) * entries for the VA range of the current image, so no maintenance is * necessary. */ - adr x0, efi_stub_entry - adr x1, efi_stub_entry_end + adr x0, entry + adr x1, entry_end sub x1, x1, x0 bl __flush_dcache_area @@ -120,5 +120,5 @@ efi_load_fail: ldp x29, x30, [sp], #32 ret -efi_stub_entry_end: -ENDPROC(efi_stub_entry) +entry_end: +ENDPROC(entry) |