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accel/tcg: Handle get_page_addr_code() returning -1 in tb_check_watchpoint() 

When we support execution from non-RAM MMIO regions, get_page_addr_code()
will return -1 to indicate that there is no RAM at the requested address.
Handle this in tb_check_watchpoint() -- if the exception happened for a
PC which doesn't correspond to RAM then there is no need to invalidate
any TBs, because the one-instruction TB will not have been cached.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Tested-by: Cédric Le Goater <clg@kaod.org>
Message-id: 20180710160013.26559-4-peter.maydell@linaro.org
This commit is contained in:
Peter Maydell 2018-08-14 17:17:19 +01:00
parent 7252f2dea9
commit c360a0fd71
1 changed files with 3 additions and 1 deletions
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4
accel/tcg/translate-all.c
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@ -2121,7 +2121,9 @@ void tb_check_watchpoint(CPUState *cpu)
cpu_get_tb_cpu_state(env, &pc, &cs_base, &flags);
addr = get_page_addr_code(env, pc);
tb_invalidate_phys_range(addr, addr + 1);
if (addr != -1) {
tb_invalidate_phys_range(addr, addr + 1);
}
}
}