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Separate ctors/dtors and init_array/fini_array sections #933

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Separate ctors/dtors and init_array/fini_array sections #933

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33 changes: 23 additions & 10 deletions templates/staticExecutable/static-executable-h2-picolibc.lcs.template
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Original file line number Diff line number Diff line change
Expand Up @@ -35,28 +35,41 @@ SECTIONS

/* Need to pre-align so that the symbols come after padding */
. = ALIGN(8);
.init_array :
PROVIDE_HIDDEN ( __bothinit_array_start = . );
.preinit_array :
{
/* lists of constructors and destructors */
PROVIDE_HIDDEN ( __preinit_array_start = . );
PROVIDE_HIDDEN ( __bothinit_array_start = . );
KEEP (*(.preinit_array))
PROVIDE_HIDDEN ( __preinit_array_end = . );

PROVIDE_HIDDEN ( __init_array_start = . );
/* run .ctors first */
}
.ctors :
{
PROVIDE_HIDDEN ( __ctors_start = . );
KEEP (*( SORT_BY_INIT_PRIORITY(.ctors.*)))
KEEP (*(.ctors))
PROVIDE_HIDDEN ( __ctors_end = . );
}
.init_array :
{
PROVIDE_HIDDEN ( __init_array_start = . );
KEEP (*( SORT_BY_INIT_PRIORITY(.init_array.*)))
KEEP (*(.init_array .ctors))
KEEP (*(.init_array))
PROVIDE_HIDDEN ( __init_array_end = . );
PROVIDE_HIDDEN ( __bothinit_array_end = . );
}
PROVIDE_HIDDEN ( __bothinit_array_end = . );
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@quic-seaswara quic-seaswara Mar 11, 2026

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why do we need these symbols bothinit_array_{start,end} ?


.dtors :
{
PROVIDE_HIDDEN ( __dtors_start = . );
KEEP (*(SORT_BY_INIT_PRIORITY(.dtors.*)))
KEEP (*(.dtors))
PROVIDE_HIDDEN ( __dtors_end = . );
}
.fini_array :
{
PROVIDE_HIDDEN ( __fini_array_start = . );
KEEP (*(SORT_BY_INIT_PRIORITY(.fini_array.*) SORT_BY_INIT_PRIORITY(.dtors.*)))
KEEP (*(.fini_array .dtors))
KEEP (*(SORT_BY_INIT_PRIORITY(.fini_array.*)))
KEEP (*(.fini_array))
KEEP (*(.fini_array*))
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@quic-seaswara quic-seaswara Mar 11, 2026

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Why this special handling ? Do we see .fini_array* ?

PROVIDE_HIDDEN ( __fini_array_end = . );
}
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