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target-xtensa: raise an exception for invalid and reserved opcodes 

This includes opcodes from disabled features and those marked reserved in the ISA.
Also end TB on opcodes that definitely generate an exception: illegal
instructions, syscall and privileged instructions.

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
master
Max Filippov 2011-10-25 18:24:09 +04:00
parent 0c852e171b
commit 6b814719b4
1 changed files with 6 additions and 1 deletions
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7
target-xtensa/translate.c
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@ -266,6 +266,10 @@ static void gen_exception_cause(DisasContext *dc, uint32_t cause)
gen_helper_exception_cause(tpc, tcause);
tcg_temp_free(tpc);
tcg_temp_free(tcause);
if (cause == ILLEGAL_INSTRUCTION_CAUSE ||
cause == SYSCALL_CAUSE) {
dc->is_jmp = DISAS_UPDATE;
}
}
static void gen_exception_cause_vaddr(DisasContext *dc, uint32_t cause,
@ -283,6 +287,7 @@ static void gen_check_privilege(DisasContext *dc)
{
if (dc->cring) {
gen_exception_cause(dc, PRIVILEGED_CAUSE);
dc->is_jmp = DISAS_UPDATE;
}
}
@ -2378,7 +2383,7 @@ static void disas_xtensa_insn(DisasContext *dc)
invalid_opcode:
qemu_log("INVALID(pc = %08x)\n", dc->pc);
dc->pc = dc->next_pc;
gen_exception_cause(dc, ILLEGAL_INSTRUCTION_CAUSE);
#undef HAS_OPTION
}