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Differential D40709

libthr: Add a stop indicator to thread_start to satisfy unwinders
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Authored by dchagin on Jun 21 2023, 8:13 PM.
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Reviewers
andrew
Summary

The right unwinding stop indicator should be CFI-undefined PC.
https://dwarfstd.org/doc/Dwarf3.pdf - page 118:

  • If a Return Address register is defined in the virtual unwind table,

and its rule is undefined (for example, by DW_CFA_undefined), then
there is no return address and no call address, and the virtual
unwind of stack activations is complete.

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Repository
rG FreeBSD src repository
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Lint Passed
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No Test Coverage
Build Status
Buildable 52246
Build 49137: arc lint + arc unit

Revision Contents
Changeset List

PathSize
lib/
libthr/
arch/
aarch64/
include/
2 lines
amd64/
include/
2 lines
arm/
include/
2 lines
i386/
include/
2 lines
powerpc/
include/
2 lines
riscv/
include/
2 lines
thread/
2 lines

Diff 123635

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lib/libthr/arch/aarch64/include/pthread_md.h

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lib/libthr/arch/amd64/include/pthread_md.h

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lib/libthr/arch/arm/include/pthread_md.h

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lib/libthr/arch/i386/include/pthread_md.h

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lib/libthr/arch/powerpc/include/pthread_md.h

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lib/libthr/arch/riscv/include/pthread_md.h

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lib/libthr/thread/thr_create.c

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