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arm64/kernel: fix incorrect EL0 check in inv_entry macro 

The implementation of macro inv_entry refers to its 'el' argument without
the required leading backslash, which results in an undefined symbol
'el' to be passed into the kernel_entry macro rather than the index of
the exception level as intended.

This undefined symbol strangely enough does not result in build failures,
although it is visible in vmlinux:

     $ nm -n vmlinux |head
                      U el
     0000000000000000 A _kernel_flags_le_hi32
     0000000000000000 A _kernel_offset_le_hi32
     0000000000000000 A _kernel_size_le_hi32
     000000000000000a A _kernel_flags_le_lo32
     .....

However, it does result in incorrect code being generated for invalid
exceptions taken from EL0, since the argument check in kernel_entry
assumes EL1 if its argument does not equal '0'.

Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Ard Biesheuvel 2016-03-18 10:58:09 +01:00 committed by Catalin Marinas
parent 2776e0e8ef
commit b660950c60
1 changed files with 1 additions and 1 deletions
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2
arch/arm64/kernel/entry.S
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@ -277,7 +277,7 @@ END(vectors)
* Invalid mode handlers
*/
.macro inv_entry, el, reason, regsize = 64
kernel_entry el, \regsize
kernel_entry \el, \regsize
mov x0, sp
mov x1, #\reason
mrs x2, esr_el1