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arch/arc: Detect arcv2 TLS register automatically

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The compiler defines __ARC_TLS_REGNO__ as the number of the
register used for TLS variables. Use that instead of hard-coding
a specific register.

Signed-off-by: Keith Packard <keithp@keithp.com>
This commit is contained in:
Keith Packard 2022-11-02 17:14:37 -07:00 committed by Carles Cufí
parent 2217608c1c
commit 10294269f7
1 changed files with 8 additions and 2 deletions
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10
arch/arc/core/thread.c
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@ -123,8 +123,14 @@ static inline void arch_setup_callee_saved_regs(struct k_thread *thread,
#ifdef CONFIG_THREAD_LOCAL_STORAGE
#ifdef CONFIG_ISA_ARCV2
/* R26 is used for thread pointer for ARCv2 */
regs->r26 = thread->tls;
#if __ARC_TLS_REGNO__ <= 0
#error Compiler not configured for thread local storage
#endif
#define _REGNO(n) r ## n
#define REGNO(n) _REGNO(n)
#define TLSREG REGNO(__ARC_TLS_REGNO__)
/* __ARC_TLS_REGNO__ is used for thread pointer for ARCv2 */
regs->TLSREG = thread->tls;
#else
/* R30 is used for thread pointer for ARCv3 */
regs->r30 = thread->tls;