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ARM: Fix push/pop alignment on ARM platforms

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This patch adjusts the way we are doing push/pop operations before
making function calls inside of assembly routines.  ARM requires 8
byte aligned stack operations across public interfaces.  This means
that we need to be sure to push multiples of 2 registers.

Fixes #2108

Signed-off-by: Andy Gross <andy.gross@linaro.org>
This commit is contained in:
Andy Gross 2019-01-31 16:31:01 -06:00 • committed by Kumar Gala
commit a468c15eca
6 changed files with 67 additions and 54 deletions
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9
arch/arm/core/exc_exit.S
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@ -87,14 +87,13 @@ _EXIT_EXC:
#endif /* CONFIG_PREEMPT_ENABLED */
#ifdef CONFIG_STACK_SENTINEL
push {lr}
push {r0, lr}
bl _check_stack_sentinel
#if defined(CONFIG_ARMV6_M_ARMV8_M_BASELINE)
pop {r0}
mov lr, r0
pop {r0, r1}
mov lr, r1
#else
pop {lr}
pop {r0, lr}
#endif /* CONFIG_ARMV6_M_ARMV8_M_BASELINE */
#endif /* CONFIG_STACK_SENTINEL */
bx lr