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spin: stash stack pointer on the parent road, restore from it #966

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Merged
pkova merged 1 commit into from
Feb 19, 2026
Merged

spin: stash stack pointer on the parent road, restore from it #966

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18 changes: 9 additions & 9 deletions pkg/noun/manage.c
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Original file line number Diff line number Diff line change
Expand Up @@ -998,12 +998,6 @@ u3m_bail(u3_noun how)
}
}

// Reset the spin stack pointer
if ( NULL != stk_u ) {
stk_u->off_w = u3R->off_w;
stk_u->fow_w = u3R->fow_w;
}

_longjmp(u3R->esc.buf, how);
}

Expand Down Expand Up @@ -1134,10 +1128,10 @@ u3m_leap(c3_w pad_w)
u3R->kid_p = u3of(u3_road, rod_u);
}

// Add slow stack pointer to rod_u
// Stash slow stack pointer
if ( NULL != stk_u ) {
rod_u->off_w = stk_u->off_w;
rod_u->fow_w = stk_u->fow_w;
u3R->off_w = stk_u->off_w;
u3R->fow_w = stk_u->fow_w;
}

/* Set up the new road.
Expand Down Expand Up @@ -1353,6 +1347,12 @@ u3m_love(u3_noun pro)

if ( _(tim_o) ) _m_renew_now();

// restore slow stack pointer
if ( NULL != stk_u ) {
stk_u->off_w = u3R->off_w;
stk_u->fow_w = u3R->fow_w;
}

// copy product and caches off our stack
//
pro = u3a_take(pro);
Expand Down