8000 cpu/arm7: Fix undefined behavior based on invalid assembly by Teufelchen1 · Pull Request #19619 · RIOT-OS/RIOT · GitHub
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cpu/arm7: Fix undefined behavior based on invalid assembly #19619

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May 20, 2023
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cpu/arm7: Fix undefined behavior based on invalid assembly #19619

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4 changes: 4 additions & 0 deletions cpu/arm7_common/common.s
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Original file line number Diff line number Diff line change
Expand Up @@ -101,6 +101,10 @@ task_return:

/* Restore all registers, PC & cpsr */
ldmfd r0, {r0-lr}^
/* According to ARM Architecture Reference Manual DDI 0100I,
* ldms which affect banked registers must be followed by a nop.
*/
nop

/* return to task */
movs pc, lr
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