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Thread local storage is broken when adding more thread variables #32015

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dcpleung opened this issue Feb 5, 2021 · 0 comments · Fixed by #32016
Closed

Thread local storage is broken when adding more thread variables #32015

dcpleung opened this issue Feb 5, 2021 · 0 comments · Fixed by #32016
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@dcpleung
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area: Kernel bug The issue is a bug, or the PR is fixing a bug priority: medium Medium impact/importance bug

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dcpleung commented Feb 5, 2021

When adding a uint64_t to the TLS test app, the test starts to fail. This is due to both tdata and tbss regions are not aligned correctly in the stack. Further testing shows that the test fails when tdata or tbss section in ELF is of size 1, 3, 5, 6, 7, and >9 (when not a multiple of 8).
@dcpleung dcpleung added the bug The issue is a bug, or the PR is fixing a bug label Feb 5, 2021
dcpleung added a commit to dcpleung/zephyr that referenced this issue Feb 5, 2021
@dcpleung
kernel: tls: align tdata/tbss sections in stack
dd60f02 
This lets the linker tell us what kind of alignment is required
for both tdata and tbss data when copying them into stack.
If they are not aligned as expected by the toolchain, generated
code would be accessing incorrect location for thread variables.

Fixes zephyrproject-rtos#32015

Signed-off-by: Daniel Leung <daniel.leung@intel.com>
@dcpleung dcpleung mentioned this issue Feb 5, 2021
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@nashif nashif added priority: medium Medium impact/importance bug area: Kernel labels Feb 5, 2021
dcpleung added a commit to dcpleung/zephyr that referenced this issue Feb 5, 2021
@dcpleung
kernel: tls: align tdata/tbss sections in stack
2c6ca6c 
This lets the linker tell us what kind of alignment is required
for both tdata and tbss data when copying them into stack.
If they are not aligned as expected by the toolchain, generated
code would be accessing incorrect location for thread variables.

Fixes zephyrproject-rtos#32015

Signed-off-by: Daniel Leung <daniel.leung@intel.com>
nashif pushed a commit that referenced this issue Feb 8, 2021
@dcpleung @nashif
kernel: tls: align tdata/tbss sections in stack
371752b 
This lets the linker tell us what kind of alignment is required
for both tdata and tbss data when copying them into stack.
If they are not aligned as expected by the toolchain, generated
code would be accessing incorrect location for thread variables.

Fixes #32015

Signed-off-by: Daniel Leung <daniel.leung@intel.com>
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area: Kernel bug The issue is a bug, or the PR is fixing a bug priority: medium Medium impact/importance bug
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kernel: tls: align tdata/tbss sections in stack dcpleung/zephyr
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