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.mayd...@linaro.org>
Reviewed-by: Peter Crosthwaite <peter.crosthwa...@xilinx.com>
---
target-arm/translate-a64.c | 7 ++++++-
target-arm/translate.c | 13 +++++++++++++
2 files changed, 19 insertions(+), 1 deletion(-)
diff --git a/target-arm/translate-a64.c b/target-arm/translate-a64.c
index ee768f2..f808998 100644
--- a/target-arm/translate-a64.c
+++ b/target-arm/translate-a64.c
@@ -1172,7 +1172,12 @@ 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;
}
diff --git a/target-arm/translate.c b/target-arm/translate.c
index e701c0f..45886f9 100644
--- a/target-arm/translate.c
+++ b/target-arm/translate.c
@@ -6923,6 +6923,19 @@ 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;
}
--
1.8.5
