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core/thread: Fix up stack and TLS alignments

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Make sure both the stack and TLS blocks are correctly aligned by
adjusting the TLS base address to the most strict alignment of the TLS
block and the stack.

Signed-off-by: Keith Packard <keithp@keithp.com>
This commit is contained in:
Keith Packard 2023-03-04 01:18:36 -08:00
parent 698abbaa04
commit 0ceb0804b0
1 changed files with 12 additions and 2 deletions
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14
core/thread.c
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@ -226,9 +226,19 @@ kernel_pid_t thread_create(char *stack, int stacksize, uint8_t priority,
thread_t *thread = (thread_t *)(uintptr_t)(stack + stacksize);
#ifdef PICOLIBC_TLS
stacksize -= _tls_size();
#if __PICOLIBC_MAJOR__ > 1 || __PICOLIBC_MINOR__ >= 8
#define TLS_ALIGN (alignof(thread_t) > _tls_align() ? alignof(thread_t) : _tls_align())
#else
#define TLS_ALIGN alignof(thread_t)
#endif
char *tls = stack + stacksize - _tls_size();
/*
* Make sure the TLS area is aligned as required and that the
* resulting stack will also be aligned as required
*/
thread->tls = (void *) ((uintptr_t) tls & ~ (TLS_ALIGN - 1));
stacksize = (char *) thread->tls - stack;
thread->tls = stack + stacksize;
_init_tls(thread->tls);
#endif