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arch: riscv: thread: Init soc context on stack

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The optional SOC_CONTEXT carries processor state registers that need to
be initialized properly to avoid uninitialized memory read as processor
state.
In particular on the RV32M1 the extra soc context stores a state for
special loop instructions, and loading non zero values will have the
core assume it is in a loop.

Signed-off-by: Karsten Koenig <karsten.koenig.030@gmail.com>
This commit is contained in:
Karsten Koenig 2020-06-07 16:10:52 +02:00 • committed by Maureen Helm
commit 2e61137cc9
2 changed files with 14 additions and 6 deletions
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8
arch/riscv/core/thread.c
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@ -21,6 +21,10 @@ void arch_new_thread(struct k_thread *thread, k_thread_stack_t *stack,
struct __esf *stack_init;
#ifdef CONFIG_RISCV_SOC_CONTEXT_SAVE
const struct soc_esf soc_esf_init = {SOC_ESF_INIT};
#endif
z_new_thread_init(thread, stack_memory, stack_size);
/* Initial stack frame for thread */
@ -65,6 +69,10 @@ void arch_new_thread(struct k_thread *thread, k_thread_stack_t *stack,
#endif
stack_init->mepc = (ulong_t)z_thread_entry_wrapper;
#ifdef CONFIG_RISCV_SOC_CONTEXT_SAVE
stack_init->soc_context = soc_esf_init;
#endif
thread->callee_saved.sp = (ulong_t)stack_init;
}