linux-user/microblaze: Fix SIGFPE si_codes

Fix a typo for ESR_EC_DIVZERO, which is integral not floating-point.
Fix the if ladder for decoding floating-point exceptions.

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20220107213243.212806-14-richard.henderson@linaro.org>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>

linux-user/microblaze/cpu_loop.c

@@ -77,15 +77,25 @@ void cpu_loop(CPUMBState *env)
             env->iflags &= ~(IMM_FLAG | D_FLAG);
             switch (env->esr & 31) {
             case ESR_EC_DIVZERO:
-                si_code = TARGET_FPE_FLTDIV;
+                si_code = TARGET_FPE_INTDIV;
                 break;
             case ESR_EC_FPU:
-                si_code = 0;
-                if (env->fsr & FSR_IO) {
+                /*
+                 * Note that the kernel passes along fsr as si_code
+                 * if there's no recognized bit set.  Possibly this
+                 * implies that si_code is 0, but follow the structure.
+                 */
+                si_code = env->fsr;
+                if (si_code & FSR_IO) {
                     si_code = TARGET_FPE_FLTINV;
-                }
-                if (env->fsr & FSR_DZ) {
+                } else if (si_code & FSR_OF) {
+                    si_code = TARGET_FPE_FLTOVF;
+                } else if (si_code & FSR_UF) {
+                    si_code = TARGET_FPE_FLTUND;
+                } else if (si_code & FSR_DZ) {
                     si_code = TARGET_FPE_FLTDIV;
+                } else if (si_code & FSR_DO) {
+                    si_code = TARGET_FPE_FLTRES;
                 }
                 break;
             default: