@@ -840,4 +840,22 @@ static inline uint32_t v7m_sp_limit(CPUARMState *env)
}
}
+/**
+ * aarch32_mode_name(): Return name of the AArch32 CPU mode
+ * @psr: Program Status Register indicating CPU mode
+ *
+ * Returns, for debug logging purposes, a printable representation
+ * of the AArch32 CPU mode ("svc", "usr", etc) as indicated by
+ * the low bits of the specified PSR.
+ */
+static inline const char *aarch32_mode_name(uint32_t psr)
+{
+ static const char * const cpu_mode_names[16] = {
+ "usr", "fiq", "irq", "svc", "???", "???", "mon", "abt",
+ "???", "???", "hyp", "und", "???", "???", "???", "sys"
+ };
+
+ return cpu_mode_names[psr & 0xf];
+}
+
#endif
@@ -6205,7 +6205,17 @@ void cpsr_write(CPUARMState *env, uint32_t val, uint32_t mask,
mask |= CPSR_IL;
val |= CPSR_IL;
}
+ qemu_log_mask(LOG_GUEST_ERROR,
+ "Illegal AArch32 mode switch attempt from %s to %s\n",
+ aarch32_mode_name(env->uncached_cpsr),
+ aarch32_mode_name(val));
} else {
+ qemu_log_mask(CPU_LOG_INT, "%s %s to %s PC 0x%" PRIx32 "\n",
+ write_type == CPSRWriteExceptionReturn ?
+ "Exception return from AArch32" :
+ "AArch32 mode switch from",
+ aarch32_mode_name(env->uncached_cpsr),
+ aarch32_mode_name(val), env->regs[15]);
switch_mode(env, val & CPSR_M);
}
}
@@ -13092,11 +13092,6 @@ void gen_intermediate_code(CPUState *cpu, TranslationBlock *tb)
translator_loop(ops, &dc.base, cpu, tb);
}
-static const char *cpu_mode_names[16] = {
- "usr", "fiq", "irq", "svc", "???", "???", "mon", "abt",
- "???", "???", "hyp", "und", "???", "???", "???", "sys"
-};
-
void arm_cpu_dump_state(CPUState *cs, FILE *f, fprintf_function cpu_fprintf,
int flags)
{
@@ -13162,7 +13157,7 @@ void arm_cpu_dump_state(CPUState *cs, FILE *f, fprintf_function cpu_fprintf,
psr & CPSR_V ? 'V' : '-',
psr & CPSR_T ? 'T' : 'A',
ns_status,
- cpu_mode_names[psr & 0xf], (psr & 0x10) ? 32 : 26);
+ aarch32_mode_name(psr), (psr & 0x10) ? 32 : 26);
}
if (flags & CPU_DUMP_FPU) {
For AArch32, exception return happens through certain kinds of CPSR write. We don't currently have any CPU_LOG_INT logging of these events (unlike AArch64, where we log in the ERET instruction). Add some suitable logging. This will log exception returns like this: Exception return from AArch32 hyp to usr PC 0x80100374 paralleling the existing logging in the exception_return helper for AArch64 exception returns: Exception return from AArch64 EL2 to AArch64 EL0 PC 0x8003045c Exception return from AArch64 EL2 to AArch32 EL0 PC 0x8003045c (Note that an AArch32 exception return can only be AArch32->AArch32, never to AArch64.) Signed-off-by: Peter Maydell <peter.maydell@linaro.org> --- target/arm/internals.h | 18 ++++++++++++++++++ target/arm/helper.c | 10 ++++++++++ target/arm/translate.c | 7 +------ 3 files changed, 29 insertions(+), 6 deletions(-) -- 2.19.0