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linker: ensure global constructors only run once

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Rename the symbols used to denote the locations of the global
constructor lists and modify the Zephyr start-up code accordingly.
On POSIX systems this ensures that the native libc init code won't
find any constructors to run before Zephyr loads.

Fixes #39347, #36858

Signed-off-by: David Palchak <palchak@google.com>
This commit is contained in:
David Palchak 2022-06-07 15:25:37 -07:00 • committed by Carles Cufí
commit b4a7f0f2ca
4 changed files with 39 additions and 14 deletions
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8
subsys/cpp/cpp_ctors.c
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@ -21,8 +21,8 @@ typedef void (*CtorFuncPtr)(void);
/* Constructor function pointer list is generated by the linker script. */
extern CtorFuncPtr __CTOR_LIST__[];
extern CtorFuncPtr __CTOR_END__[];
extern CtorFuncPtr __ZEPHYR_CTOR_LIST__[];
extern CtorFuncPtr __ZEPHYR_CTOR_END__[];
/**
*
@ -35,9 +35,9 @@ void __do_global_ctors_aux(void)
{
unsigned int nCtors;
nCtors = (unsigned long)__CTOR_LIST__[0];
nCtors = (unsigned long)__ZEPHYR_CTOR_LIST__[0];
while (nCtors >= 1U) {
__CTOR_LIST__[nCtors--]();
__ZEPHYR_CTOR_LIST__[nCtors--]();
}
}