target/m68k: add CPU_LOG_INT trace

Display the interrupts/exceptions information
in QEMU logs (-d int)

Backports commit 5beb144e04f44772804ac8405b6a54a17fe78909 from qemu

qemu/target/m68k/cpu.h

@@ -47,6 +47,8 @@
 #define EXCP_ADDRESS        3   /* Address error.  */
 #define EXCP_ILLEGAL        4   /* Illegal instruction.  */
 #define EXCP_DIV0           5   /* Divide by zero */
+#define EXCP_CHK            6   /* CHK, CHK2 Instructions */
+#define EXCP_TRAPCC         7   /* FTRAPcc, TRAPcc, TRAPV Instructions */
 #define EXCP_PRIVILEGE      8   /* Privilege violation.  */
 #define EXCP_TRACE          9
 #define EXCP_LINEA          10  /* Unimplemented line-A (MAC) opcode.  */
@@ -55,6 +57,9 @@
 #define EXCP_DEBEGBP        13  /* Breakpoint debug interrupt.  */
 #define EXCP_FORMAT         14  /* RTE format error.  */
 #define EXCP_UNINITIALIZED  15
+#define EXCP_SPURIOUS       24  /* Spurious interrupt */
+#define EXCP_INT_LEVEL_1    25  /* Level 1 Interrupt autovector */
+#define EXCP_INT_LEVEL_7    31  /* Level 7 Interrupt autovector */
 #define EXCP_TRAP0          32   /* User trap #0.  */
 #define EXCP_TRAP15         47   /* User trap #15.  */
 #define EXCP_FP_BSUN        48 /* Branch Set on Unordered */
@@ -65,6 +70,9 @@
 #define EXCP_FP_OVFL        53 /* Overflow */
 #define EXCP_FP_SNAN        54 /* Signaling Not-A-Number */
 #define EXCP_FP_UNIMP       55 /* Unimplemented Data type */
+#define EXCP_MMU_CONF       56  /* MMU Configuration Error */
+#define EXCP_MMU_ILLEGAL    57  /* MMU Illegal Operation Error */
+#define EXCP_MMU_ACCESS     58  /* MMU Access Level Violation Error */
 #define EXCP_UNSUPPORTED    61
 
 #define EXCP_RTE            0x100

qemu/target/m68k/op_helper.c

@@ -65,10 +65,119 @@ static void do_rte(CPUM68KState *env)
     helper_set_sr(env, fmt);
 }
 
+static const char *m68k_exception_name(int index)
+{
+    switch (index) {
+    case EXCP_ACCESS:
+        return "Access Fault";
+    case EXCP_ADDRESS:
+        return "Address Error";
+    case EXCP_ILLEGAL:
+        return "Illegal Instruction";
+    case EXCP_DIV0:
+        return "Divide by Zero";
+    case EXCP_CHK:
+        return "CHK/CHK2";
+    case EXCP_TRAPCC:
+        return "FTRAPcc, TRAPcc, TRAPV";
+    case EXCP_PRIVILEGE:
+        return "Privilege Violation";
+    case EXCP_TRACE:
+        return "Trace";
+    case EXCP_LINEA:
+        return "A-Line";
+    case EXCP_LINEF:
+        return "F-Line";
+    case EXCP_DEBEGBP: /* 68020/030 only */
+        return "Copro Protocol Violation";
+    case EXCP_FORMAT:
+        return "Format Error";
+    case EXCP_UNINITIALIZED:
+        return "Unitialized Interruot";
+    case EXCP_SPURIOUS:
+        return "Spurious Interrupt";
+    case EXCP_INT_LEVEL_1:
+        return "Level 1 Interrupt";
+    case EXCP_INT_LEVEL_1 + 1:
+        return "Level 2 Interrupt";
+    case EXCP_INT_LEVEL_1 + 2:
+        return "Level 3 Interrupt";
+    case EXCP_INT_LEVEL_1 + 3:
+        return "Level 4 Interrupt";
+    case EXCP_INT_LEVEL_1 + 4:
+        return "Level 5 Interrupt";
+    case EXCP_INT_LEVEL_1 + 5:
+        return "Level 6 Interrupt";
+    case EXCP_INT_LEVEL_1 + 6:
+        return "Level 7 Interrupt";
+    case EXCP_TRAP0:
+        return "TRAP #0";
+    case EXCP_TRAP0 + 1:
+        return "TRAP #1";
+    case EXCP_TRAP0 + 2:
+        return "TRAP #2";
+    case EXCP_TRAP0 + 3:
+        return "TRAP #3";
+    case EXCP_TRAP0 + 4:
+        return "TRAP #4";
+    case EXCP_TRAP0 + 5:
+        return "TRAP #5";
+    case EXCP_TRAP0 + 6:
+        return "TRAP #6";
+    case EXCP_TRAP0 + 7:
+        return "TRAP #7";
+    case EXCP_TRAP0 + 8:
+        return "TRAP #8";
+    case EXCP_TRAP0 + 9:
+        return "TRAP #9";
+    case EXCP_TRAP0 + 10:
+        return "TRAP #10";
+    case EXCP_TRAP0 + 11:
+        return "TRAP #11";
+    case EXCP_TRAP0 + 12:
+        return "TRAP #12";
+    case EXCP_TRAP0 + 13:
+        return "TRAP #13";
+    case EXCP_TRAP0 + 14:
+        return "TRAP #14";
+    case EXCP_TRAP0 + 15:
+        return "TRAP #15";
+    case EXCP_FP_BSUN:
+        return "FP Branch/Set on unordered condition";
+    case EXCP_FP_INEX:
+        return "FP Inexact Result";
+    case EXCP_FP_DZ:
+        return "FP Divide by Zero";
+    case EXCP_FP_UNFL:
+        return "FP Underflow";
+    case EXCP_FP_OPERR:
+        return "FP Operand Error";
+    case EXCP_FP_OVFL:
+        return "FP Overflow";
+    case EXCP_FP_SNAN:
+        return "FP Signaling NAN";
+    case EXCP_FP_UNIMP:
+        return "FP Unimplemented Data Type";
+    case EXCP_MMU_CONF: /* 68030/68851 only */
+        return "MMU Configuration Error";
+    case EXCP_MMU_ILLEGAL: /* 68851 only */
+        return "MMU Illegal Operation";
+    case EXCP_MMU_ACCESS: /* 68851 only */
+        return "MMU Access Level Violation";
+    }
+
+    if (index >= 64 && index <= 255) {
+        return "User Defined Vector";
+    }
+
+    return "Unassigned";
+}
+
 static void do_interrupt_all(CPUM68KState *env, int is_hw)
 {
     CPUState *cs = CPU(m68k_env_get_cpu(env));
     uint32_t sp;
+    uint32_t sr;
     uint32_t fmt;
     uint32_t retaddr;
     uint32_t vector;
@@ -97,10 +206,16 @@ static void do_interrupt_all(CPUM68KState *env, int is_hw)
 
     vector = cs->exception_index << 2;
 
+    sr = env->sr | cpu_m68k_get_ccr(env);
+    if (qemu_loglevel_mask(CPU_LOG_INT)) {
+        qemu_log("INT: %s(%#x) pc=%08x sp=%08x sr=%04x\n",
+                 m68k_exception_name(cs->exception_index),
+                 vector, env->pc, env->aregs[7], sr);
+    }
+
     fmt |= 0x40000000;
     fmt |= vector << 16;
-    fmt |= env->sr;
+    fmt |= sr;
-    fmt |= cpu_m68k_get_ccr(env);
 
     env->sr |= SR_S;
     if (is_hw) {