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We should allow M-mode to M-mode ECALLs because: 1. No other mode can handle M-mode ECALLs 2. In future, we can allow M-mode baremetal application (not linked to OpenSBI) running independently and cooperatively without corrupting OpenSBI M-mode state (CSRs and memory). Signed-off-by: Anup Patel <anup.patel@wdc.com> Reviewed-by: Atish Patra <atish.patra@wdc.com>