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riscv: Pin code containing the program counter as well.

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Since PC no longer participates in interior register pairing, we need
to make sure that the currently executing piece of code doesn't move
underneath from it.
This commit is contained in:
Charles Zhang 2022-03-15 00:01:56 -07:00
parent 89fb96640a
commit 01ee7243a8
1 changed files with 4 additions and 3 deletions
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7
src/runtime/gencgc.c
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@ -3565,11 +3565,12 @@ static void conservative_pin_code_from_return_addresses(struct thread* th) {
object_ptr++)
maybe_pin_code(*object_ptr);
int i = fixnum_value(read_TLS(FREE_INTERRUPT_CONTEXT_INDEX,th));
// Scan return registers in interrupted frames: They may contain
// interior code pointers that weren't spilled onto the stack, as
// is the case for leaf functions.
// Scan program counters and return registers in interrupted
// frames: They may contain interior code pointers that weren't
// spilled onto the stack, as is the case for leaf functions.
for (i = i - 1; i >= 0; --i) {
os_context_t* context = nth_interrupt_context(i, th);
maybe_pin_code(os_context_pc(context));
maybe_pin_code((lispobj)*os_context_register_addr(context, reg_RA));
}
}