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arch: arm: aarch32: Rework non-Cortex-M context preservation

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The current context preservation implementation saves the spsr and
lr_irq registers, which contain the cpsr and pc register values of the
interrupted context, in the thread callee-saved block and this prevents
nesting of interrupts because these values are required to be part of
the exception stack frame to preserve the nested interrupt context.

This commit reworks the AArch32 non-Cortex-M context preservation
implementation to save the spsr and lr_irq registers in the exception
stack frame to allow preservation of the nested interrupt context as
well as the interrupted thread context.

Signed-off-by: Stephanos Ioannidis <root@stephanos.io>
This commit is contained in:
Stephanos Ioannidis 2020-03-20 22:16:18 +09:00 • committed by Ioannis Glaropoulos
commit b63a028fbc
7 changed files with 108 additions and 70 deletions
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6
include/arch/arm/aarch32/thread.h
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@ -31,13 +31,7 @@ struct _callee_saved {
u32_t v6; /* r9 */
u32_t v7; /* r10 */
u32_t v8; /* r11 */
#if defined(CONFIG_CPU_CORTEX_R)
u32_t spsr;/* r12 */
u32_t psp; /* r13 */
u32_t lr; /* r14 */
#else
u32_t psp; /* r13 */
#endif
};
typedef struct _callee_saved _callee_saved_t;