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Both the TLS block and stack must be correctly aligned when using picolibc. The architecture stack alignment is represented by the portBYTE_ALIGNMENT_MASK and the TLS block alignment is provided by the Picolibc _tls_align() inline function for Picolibc version 1.8 and above. For older versions of Picolibc, we'll assume that the TLS block requires the same alignment as the stack. For downward growing stacks, this requires aligning the start of the TLS block to the maximum of the stack alignment and the TLS alignment. With this, both the TLS block and stack will now be correctly aligned. For upward growing stacks, the two areas must be aligned independently; the TLS block is aligned from the start of the stack, then the tls space is allocated, and then the stack is aligned above that. It's probably useful to know here that the linker ensures that variables within the TLS block are assigned offsets that match their alignment requirements. If the TLS block itself is correctly aligned, then everything within will also be. I have only tested the downward growing stack branch of this patch. Signed-off-by: Keith Packard <keithpac@amazon.com> Co-authored-by: Keith Packard <keithpac@amazon.com> Co-authored-by: Gaurav-Aggarwal-AWS <33462878+aggarg@users.noreply.github.com> |
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| .. | ||
| atomic.h | ||
| deprecated_definitions.h | ||
| event_groups.h | ||
| FreeRTOS.h | ||
| list.h | ||
| message_buffer.h | ||
| mpu_prototypes.h | ||
| mpu_wrappers.h | ||
| newlib-freertos.h | ||
| picolibc-freertos.h | ||
| portable.h | ||
| projdefs.h | ||
| queue.h | ||
| semphr.h | ||
| stack_macros.h | ||
| StackMacros.h | ||
| stdint.readme | ||
| stream_buffer.h | ||
| task.h | ||
| timers.h | ||