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arm: fix assembler offset errors on Cortex-M0

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In some kernel configurations, the offset can be greater
than the maximum of 124 for ldr/str immediate offsets.

Fixes: #9113

Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
This commit is contained in:
Andrew Boie 2018-07-25 11:47:21 -07:00 • committed by Anas Nashif
commit 97c06a7ab3
1 changed files with 14 additions and 0 deletions
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14
arch/arm/core/swap_helper.S
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@ -126,9 +126,23 @@ SECTION_FUNC(TEXT, __pendsv)
str v3, [v4, #0]
/* Restore previous interrupt disable state (irq_lock key) */
#if (defined(CONFIG_CPU_CORTEX_M0PLUS) || defined(CONFIG_CPU_CORTEX_M0)) && \
_thread_offset_to_basepri > 124
/* Doing it this way since the offset to thread->arch.basepri can in
* some configurations be larger than the maximum of 124 for ldr/str
* immediate offsets.
*/
ldr r4, =_thread_offset_to_basepri
adds r4, r2, r4
ldr r0, [r4]
movs.n r3, #0
str r3, [r4]
#else
ldr r0, [r2, #_thread_offset_to_basepri]
movs.n r3, #0
str r3, [r2, #_thread_offset_to_basepri]
#endif
#if defined(CONFIG_ARMV6_M_ARMV8_M_BASELINE)
/* BASEPRI not available, previous interrupt disable state