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7f11271403
The check for the scv instruction in coregrind/m_machine.c issues an scv instruction and uses sigill to determine if the instruction is supported. Issuing scv on systems that don't support scv, i.e. scv support is not in HWCAPS2, generates a message in dmesg "Facility 'SCV' unavailable (12), exception". This patch removes the sigill based scv instruction test from coregrind/m_machine.c. The scv support is now determined by reading the HWCAPS2 in setup_client_stack(). VG_(machine_ppc64_set_scv_support) is called to set the flag ppc_scv_supported in struct VexArchInfo. The allow_scv flag is added in disInstr_PPC_WRK. The allow_scv flag is used to ensure the host has support for scv before generating the iops for the scv instruction.