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target-arm: Log bad system register accesses with LOG_UNIMP

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Log guest attempts to access unimplemented system registers via
the LOG_UNIMP reporting mechanism (for both the 32 bit and 64 bit
instruction sets). This is particularly useful for debugging
problems where the guest is trying to use a system register that
QEMU doesn't implement.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Peter Crosthwaite <peter.crosthwaite@xilinx.com>
This commit is contained in:
Peter Maydell 2014-02-20 10:35:52 +00:00
parent 1456364ff0
commit 626187d86b
2 changed files with 19 additions and 1 deletions
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7
target-arm/translate-a64.c
View file

@ -1177,7 +1177,12 @@ static void handle_sys(DisasContext *s, uint32_t insn, bool isread,
crn, crm, op0, op1, op2));
if (!ri) {
/* Unknown register */
/* Unknown register; this might be a guest error or a QEMU
* unimplemented feature.
*/
qemu_log_mask(LOG_UNIMP, "%s access to unsupported AArch64 "
"system register op0:%d op1:%d crn:%d crm:%d op2:%d\n",
isread ? "read" : "write", op0, op1, crn, crm, op2);
unallocated_encoding(s);
return;
}

13
target-arm/translate.c
View file

@ -6962,6 +6962,19 @@ static int disas_coproc_insn(CPUARMState * env, DisasContext *s, uint32_t insn)
return 0;
}
/* Unknown register; this might be a guest error or a QEMU
* unimplemented feature.
*/
if (is64) {
qemu_log_mask(LOG_UNIMP, "%s access to unsupported AArch32 "
"64 bit system register cp:%d opc1: %d crm:%d\n",
isread ? "read" : "write", cpnum, opc1, crm);
} else {
qemu_log_mask(LOG_UNIMP, "%s access to unsupported AArch32 "
"system register cp:%d opc1:%d crn:%d crm:%d opc2:%d\n",
isread ? "read" : "write", cpnum, opc1, crn, crm, opc2);
}
return 1;
}