arm64: head.S: use ordinary stack frame for __primary_switched()

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Instead of stashing the value of the link register in x28 before setting
up the stack and calling into C code, create an ordinary PCS compatible
stack frame so that we can push the return address onto the stack.

Since exception handlers require a stack as well, assign the stack pointer
register before installing the vector table.

Note that this accounts for the difference between THREAD_START_SP and
THREAD_SIZE, given that the stack pointer is always decremented before
calling into any C code.

Reviewed-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>

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Ard Biesheuvel 2016-08-31 12:05:16 +01:00 • committed by Will Deacon

parent b929fe320e

commit 60699ba18b

1 changed files with 9 additions and 9 deletions

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