diff --git a/hw/cs4231.c b/hw/cs4231.c
index f7ce0af..2977101 100644
--- a/hw/cs4231.c
+++ b/hw/cs4231.c
@@ -23,9 +23,7 @@
  */
 
 #include "sysbus.h"
-
-/* debug CS4231 */
-//#define DEBUG_CS
+#include "trace.h"
 
 /*
  * In addition to Crystal CS4231 there is a DMA controller on Sparc.
@@ -46,13 +44,6 @@
 #define CS_VER 0xa0
 #define CS_CDC_VER 0x8a
 
-#ifdef DEBUG_CS
-#define DPRINTF(fmt, ...)                                       \
-    do { printf("CS: " fmt , ## __VA_ARGS__); } while (0)
-#else
-#define DPRINTF(fmt, ...)
-#endif
-
 static void cs_reset(DeviceState *d)
 {
     CSState *s = container_of(d, CSState, busdev.qdev);
@@ -79,11 +70,11 @@
             ret = s->dregs[CS_RAP(s)];
             break;
         }
-        DPRINTF("read dreg[%d]: 0x%8.8x\n", CS_RAP(s), ret);
+        trace_cs4231_mem_readl_dreg(CS_RAP(s), ret);
         break;
     default:
         ret = s->regs[saddr];
-        DPRINTF("read reg[%d]: 0x%8.8x\n", saddr, ret);
+        trace_cs4231_mem_readl_reg(saddr, ret);
         break;
     }
     return ret;
@@ -95,11 +86,10 @@
     uint32_t saddr;
 
     saddr = addr >> 2;
-    DPRINTF("write reg[%d]: 0x%8.8x -> 0x%8.8x\n", saddr, s->regs[saddr], val);
+    trace_cs4231_mem_writel_reg(saddr, s->regs[saddr], val);
     switch (saddr) {
     case 1:
-        DPRINTF("write dreg[%d]: 0x%2.2x -> 0x%2.2x\n", CS_RAP(s),
-                s->dregs[CS_RAP(s)], val);
+        trace_cs4231_mem_writel_dreg(CS_RAP(s), s->dregs[CS_RAP(s)], val);
         switch(CS_RAP(s)) {
         case 11:
         case 25: // Read only
diff --git a/hw/eccmemctl.c b/hw/eccmemctl.c
index 498c61a..a8042e9 100644
--- a/hw/eccmemctl.c
+++ b/hw/eccmemctl.c
@@ -23,15 +23,7 @@
  */
 
 #include "sysbus.h"
-
-//#define DEBUG_ECC
-
-#ifdef DEBUG_ECC
-#define DPRINTF(fmt, ...)                                       \
-    do { printf("ECC: " fmt , ## __VA_ARGS__); } while (0)
-#else
-#define DPRINTF(fmt, ...)
-#endif
+#include "trace.h"
 
 /* There are 3 versions of this chip used in SMP sun4m systems:
  * MCC (version 0, implementation 0) SS-600MP
@@ -148,32 +140,32 @@
             s->regs[ECC_MER] = s->version | (val & ECC_MER_MASK_1);
         else if (s->version == ECC_SMC)
             s->regs[ECC_MER] = s->version | (val & ECC_MER_MASK_2);
-        DPRINTF("Write memory enable %08x\n", val);
+        trace_ecc_mem_writel_mer(val);
         break;
     case ECC_MDR:
         s->regs[ECC_MDR] =  val & ECC_MDR_MASK;
-        DPRINTF("Write memory delay %08x\n", val);
+        trace_ecc_mem_writel_mdr(val);
         break;
     case ECC_MFSR:
         s->regs[ECC_MFSR] =  val;
         qemu_irq_lower(s->irq);
-        DPRINTF("Write memory fault status %08x\n", val);
+        trace_ecc_mem_writel_mfsr(val);
         break;
     case ECC_VCR:
         s->regs[ECC_VCR] =  val;
-        DPRINTF("Write slot configuration %08x\n", val);
+        trace_ecc_mem_writel_vcr(val);
         break;
     case ECC_DR:
         s->regs[ECC_DR] =  val;
-        DPRINTF("Write diagnostic %08x\n", val);
+        trace_ecc_mem_writel_dr(val);
         break;
     case ECC_ECR0:
         s->regs[ECC_ECR0] =  val;
-        DPRINTF("Write event count 1 %08x\n", val);
+        trace_ecc_mem_writel_ecr0(val);
         break;
     case ECC_ECR1:
         s->regs[ECC_ECR0] =  val;
-        DPRINTF("Write event count 2 %08x\n", val);
+        trace_ecc_mem_writel_ecr1(val);
         break;
     }
 }
@@ -186,39 +178,39 @@
     switch (addr >> 2) {
     case ECC_MER:
         ret = s->regs[ECC_MER];
-        DPRINTF("Read memory enable %08x\n", ret);
+        trace_ecc_mem_readl_mer(ret);
         break;
     case ECC_MDR:
         ret = s->regs[ECC_MDR];
-        DPRINTF("Read memory delay %08x\n", ret);
+        trace_ecc_mem_readl_mdr(ret);
         break;
     case ECC_MFSR:
         ret = s->regs[ECC_MFSR];
-        DPRINTF("Read memory fault status %08x\n", ret);
+        trace_ecc_mem_readl_mfsr(ret);
         break;
     case ECC_VCR:
         ret = s->regs[ECC_VCR];
-        DPRINTF("Read slot configuration %08x\n", ret);
+        trace_ecc_mem_readl_vcr(ret);
         break;
     case ECC_MFAR0:
         ret = s->regs[ECC_MFAR0];
-        DPRINTF("Read memory fault address 0 %08x\n", ret);
+        trace_ecc_mem_readl_mfar0(ret);
         break;
     case ECC_MFAR1:
         ret = s->regs[ECC_MFAR1];
-        DPRINTF("Read memory fault address 1 %08x\n", ret);
+        trace_ecc_mem_readl_mfar1(ret);
         break;
     case ECC_DR:
         ret = s->regs[ECC_DR];
-        DPRINTF("Read diagnostic %08x\n", ret);
+        trace_ecc_mem_readl_dr(ret);
         break;
     case ECC_ECR0:
         ret = s->regs[ECC_ECR0];
-        DPRINTF("Read event count 1 %08x\n", ret);
+        trace_ecc_mem_readl_ecr0(ret);
         break;
     case ECC_ECR1:
         ret = s->regs[ECC_ECR0];
-        DPRINTF("Read event count 2 %08x\n", ret);
+        trace_ecc_mem_readl_ecr1(ret);
         break;
     }
     return ret;
@@ -241,7 +233,7 @@
 {
     ECCState *s = opaque;
 
-    DPRINTF("Write diagnostic[%d] = %02x\n", (int)addr, val);
+    trace_ecc_diag_mem_writeb(addr, val);
     s->diag[addr & ECC_DIAG_MASK] = val;
 }
 
@@ -250,7 +242,7 @@
     ECCState *s = opaque;
     uint32_t ret = s->diag[(int)addr];
 
-    DPRINTF("Read diagnostic[%d] = %02x\n", (int)addr, ret);
+    trace_ecc_diag_mem_readb(addr, ret);
     return ret;
 }
 
diff --git a/hw/lance.c b/hw/lance.c
index b6b04dd..dc12144 100644
--- a/hw/lance.c
+++ b/hw/lance.c
@@ -40,8 +40,8 @@
 #include "qemu-timer.h"
 #include "qemu_socket.h"
 #include "sun4m.h"
-
 #include "pcnet.h"
+#include "trace.h"
 
 typedef struct {
     SysBusDevice busdev;
@@ -59,10 +59,8 @@
                              uint32_t val)
 {
     SysBusPCNetState *d = opaque;
-#ifdef PCNET_DEBUG_IO
-    printf("lance_mem_writew addr=" TARGET_FMT_plx " val=0x%04x\n", addr,
-           val & 0xffff);
-#endif
+
+    trace_lance_mem_writew(addr, val & 0xffff);
     pcnet_ioport_writew(&d->state, addr, val & 0xffff);
 }
 
@@ -72,11 +70,7 @@
     uint32_t val;
 
     val = pcnet_ioport_readw(&d->state, addr);
-#ifdef PCNET_DEBUG_IO
-    printf("lance_mem_readw addr=" TARGET_FMT_plx " val = 0x%04x\n", addr,
-           val & 0xffff);
-#endif
-
+    trace_lance_mem_readw(addr, val & 0xffff);
     return val & 0xffff;
 }
 
diff --git a/hw/slavio_intctl.c b/hw/slavio_intctl.c
index 10362a3..9d5ad86 100644
--- a/hw/slavio_intctl.c
+++ b/hw/slavio_intctl.c
@@ -25,16 +25,9 @@
 #include "sun4m.h"
 #include "monitor.h"
 #include "sysbus.h"
+#include "trace.h"
 
 //#define DEBUG_IRQ_COUNT
-//#define DEBUG_IRQ
-
-#ifdef DEBUG_IRQ
-#define DPRINTF(fmt, ...)                                       \
-    do { printf("IRQ: " fmt , ## __VA_ARGS__); } while (0)
-#else
-#define DPRINTF(fmt, ...)
-#endif
 
 /*
  * Registers of interrupt controller in sun4m.
@@ -97,7 +90,7 @@
         ret = 0;
         break;
     }
-    DPRINTF("read cpu %d reg 0x" TARGET_FMT_plx " = %x\n", s->cpu, addr, ret);
+    trace_slavio_intctl_mem_readl(s->cpu, addr, ret);
 
     return ret;
 }
@@ -109,21 +102,19 @@
     uint32_t saddr;
 
     saddr = addr >> 2;
-    DPRINTF("write cpu %d reg 0x" TARGET_FMT_plx " = %x\n", s->cpu, addr, val);
+    trace_slavio_intctl_mem_writel(s->cpu, addr, val);
     switch (saddr) {
     case 1: // clear pending softints
         val &= CPU_SOFTIRQ_MASK | CPU_IRQ_INT15_IN;
         s->intreg_pending &= ~val;
         slavio_check_interrupts(s->master, 1);
-        DPRINTF("Cleared cpu %d irq mask %x, curmask %x\n", s->cpu, val,
-                s->intreg_pending);
+        trace_slavio_intctl_mem_writel_clear(s->cpu, val, s->intreg_pending);
         break;
     case 2: // set softint
         val &= CPU_SOFTIRQ_MASK;
         s->intreg_pending |= val;
         slavio_check_interrupts(s->master, 1);
-        DPRINTF("Set cpu %d irq mask %x, curmask %x\n", s->cpu, val,
-                s->intreg_pending);
+        trace_slavio_intctl_mem_writel_set(s->cpu, val, s->intreg_pending);
         break;
     default:
         break;
@@ -163,7 +154,7 @@
         ret = 0;
         break;
     }
-    DPRINTF("read system reg 0x" TARGET_FMT_plx " = %x\n", addr, ret);
+    trace_slavio_intctlm_mem_readl(addr, ret);
 
     return ret;
 }
@@ -175,14 +166,13 @@
     uint32_t saddr;
 
     saddr = addr >> 2;
-    DPRINTF("write system reg 0x" TARGET_FMT_plx " = %x\n", addr, val);
+    trace_slavio_intctlm_mem_writel(addr, val);
     switch (saddr) {
     case 2: // clear (enable)
         // Force clear unused bits
         val &= MASTER_IRQ_MASK;
         s->intregm_disabled &= ~val;
-        DPRINTF("Enabled master irq mask %x, curmask %x\n", val,
-                s->intregm_disabled);
+        trace_slavio_intctlm_mem_writel_enable(val, s->intregm_disabled);
         slavio_check_interrupts(s, 1);
         break;
     case 3: // set (disable; doesn't affect pending)
@@ -190,13 +180,12 @@
         val &= MASTER_IRQ_MASK;
         s->intregm_disabled |= val;
         slavio_check_interrupts(s, 1);
-        DPRINTF("Disabled master irq mask %x, curmask %x\n", val,
-                s->intregm_disabled);
+        trace_slavio_intctlm_mem_writel_disable(val, s->intregm_disabled);
         break;
     case 4:
         s->target_cpu = val & (MAX_CPUS - 1);
         slavio_check_interrupts(s, 1);
-        DPRINTF("Set master irq cpu %d\n", s->target_cpu);
+        trace_slavio_intctlm_mem_writel_target(s->target_cpu);
         break;
     default:
         break;
@@ -264,7 +253,7 @@
 
     pending &= ~s->intregm_disabled;
 
-    DPRINTF("pending %x disabled %x\n", pending, s->intregm_disabled);
+    trace_slavio_check_interrupts(pending, s->intregm_disabled);
     for (i = 0; i < MAX_CPUS; i++) {
         pil_pending = 0;
 
@@ -327,8 +316,7 @@
     uint32_t pil = intbit_to_level[irq];
     unsigned int i;
 
-    DPRINTF("Set cpu %d irq %d -> pil %d level %d\n", s->target_cpu, irq, pil,
-            level);
+    trace_slavio_set_irq(s->target_cpu, irq, pil, level);
     if (pil > 0) {
         if (level) {
 #ifdef DEBUG_IRQ_COUNT
@@ -356,7 +344,7 @@
 {
     SLAVIO_INTCTLState *s = opaque;
 
-    DPRINTF("Set cpu %d local timer level %d\n", cpu, level);
+    trace_slavio_set_timer_irq_cpu(cpu, level);
 
     if (level) {
         s->slaves[cpu].intreg_pending |= CPU_IRQ_TIMER_IN;
diff --git a/hw/slavio_misc.c b/hw/slavio_misc.c
index 5ae628d..1d81a63 100644
--- a/hw/slavio_misc.c
+++ b/hw/slavio_misc.c
@@ -24,9 +24,7 @@
 
 #include "sysemu.h"
 #include "sysbus.h"
-
-/* debug misc */
-//#define DEBUG_MISC
+#include "trace.h"
 
 /*
  * This is the auxio port, chip control and system control part of
@@ -36,13 +34,6 @@
  * This also includes the PMC CPU idle controller.
  */
 
-#ifdef DEBUG_MISC
-#define MISC_DPRINTF(fmt, ...)                                  \
-    do { printf("MISC: " fmt , ## __VA_ARGS__); } while (0)
-#else
-#define MISC_DPRINTF(fmt, ...)
-#endif
-
 typedef struct MiscState {
     SysBusDevice busdev;
     qemu_irq irq;
@@ -79,10 +70,10 @@
     MiscState *s = opaque;
 
     if ((s->aux2 & AUX2_PWRFAIL) && (s->config & CFG_PWRINTEN)) {
-        MISC_DPRINTF("Raise IRQ\n");
+        trace_slavio_misc_update_irq_raise();
         qemu_irq_raise(s->irq);
     } else {
-        MISC_DPRINTF("Lower IRQ\n");
+        trace_slavio_misc_update_irq_lower();
         qemu_irq_lower(s->irq);
     }
 }
@@ -99,7 +90,7 @@
 {
     MiscState *s = opaque;
 
-    MISC_DPRINTF("Power fail: %d, config: %d\n", power_failing, s->config);
+    trace_slavio_set_power_fail(power_failing, s->config);
     if (power_failing && (s->config & CFG_PWRINTEN)) {
         s->aux2 |= AUX2_PWRFAIL;
     } else {
@@ -113,7 +104,7 @@
 {
     MiscState *s = opaque;
 
-    MISC_DPRINTF("Write config %2.2x\n", val & 0xff);
+    trace_slavio_cfg_mem_writeb(val & 0xff);
     s->config = val & 0xff;
     slavio_misc_update_irq(s);
 }
@@ -124,7 +115,7 @@
     uint32_t ret = 0;
 
     ret = s->config;
-    MISC_DPRINTF("Read config %2.2x\n", ret);
+    trace_slavio_cfg_mem_readb(ret);
     return ret;
 }
 
@@ -145,7 +136,7 @@
 {
     MiscState *s = opaque;
 
-    MISC_DPRINTF("Write diag %2.2x\n", val & 0xff);
+    trace_slavio_diag_mem_writeb(val & 0xff);
     s->diag = val & 0xff;
 }
 
@@ -155,7 +146,7 @@
     uint32_t ret = 0;
 
     ret = s->diag;
-    MISC_DPRINTF("Read diag %2.2x\n", ret);
+    trace_slavio_diag_mem_readb(ret);
     return ret;
 }
 
@@ -176,7 +167,7 @@
 {
     MiscState *s = opaque;
 
-    MISC_DPRINTF("Write modem control %2.2x\n", val & 0xff);
+    trace_slavio_mdm_mem_writeb(val & 0xff);
     s->mctrl = val & 0xff;
 }
 
@@ -186,7 +177,7 @@
     uint32_t ret = 0;
 
     ret = s->mctrl;
-    MISC_DPRINTF("Read modem control %2.2x\n", ret);
+    trace_slavio_mdm_mem_readb(ret);
     return ret;
 }
 
@@ -207,7 +198,7 @@
 {
     MiscState *s = opaque;
 
-    MISC_DPRINTF("Write aux1 %2.2x\n", val & 0xff);
+    trace_slavio_aux1_mem_writeb(val & 0xff);
     if (val & AUX1_TC) {
         // Send a pulse to floppy terminal count line
         if (s->fdc_tc) {
@@ -225,8 +216,7 @@
     uint32_t ret = 0;
 
     ret = s->aux1;
-    MISC_DPRINTF("Read aux1 %2.2x\n", ret);
-
+    trace_slavio_aux1_mem_readb(ret);
     return ret;
 }
 
@@ -248,7 +238,7 @@
     MiscState *s = opaque;
 
     val &= AUX2_PWRINTCLR | AUX2_PWROFF;
-    MISC_DPRINTF("Write aux2 %2.2x\n", val);
+    trace_slavio_aux2_mem_writeb(val & 0xff);
     val |= s->aux2 & AUX2_PWRFAIL;
     if (val & AUX2_PWRINTCLR) // Clear Power Fail int
         val &= AUX2_PWROFF;
@@ -264,8 +254,7 @@
     uint32_t ret = 0;
 
     ret = s->aux2;
-    MISC_DPRINTF("Read aux2 %2.2x\n", ret);
-
+    trace_slavio_aux2_mem_readb(ret);
     return ret;
 }
 
@@ -285,7 +274,7 @@
 {
     APCState *s = opaque;
 
-    MISC_DPRINTF("Write power management %2.2x\n", val & 0xff);
+    trace_apc_mem_writeb(val & 0xff);
     qemu_irq_raise(s->cpu_halt);
 }
 
@@ -293,7 +282,7 @@
 {
     uint32_t ret = 0;
 
-    MISC_DPRINTF("Read power management %2.2x\n", ret);
+    trace_apc_mem_readb(ret);
     return ret;
 }
 
@@ -321,7 +310,7 @@
     default:
         break;
     }
-    MISC_DPRINTF("Read system control %08x\n", ret);
+    trace_slavio_sysctrl_mem_readl(ret);
     return ret;
 }
 
@@ -330,7 +319,7 @@
 {
     MiscState *s = opaque;
 
-    MISC_DPRINTF("Write system control %08x\n", val);
+    trace_slavio_sysctrl_mem_writel(val);
     switch (addr) {
     case 0:
         if (val & SYS_RESET) {
@@ -367,7 +356,7 @@
     default:
         break;
     }
-    MISC_DPRINTF("Read diagnostic LED %04x\n", ret);
+    trace_slavio_led_mem_readw(ret);
     return ret;
 }
 
@@ -376,7 +365,7 @@
 {
     MiscState *s = opaque;
 
-    MISC_DPRINTF("Write diagnostic LED %04x\n", val & 0xffff);
+    trace_slavio_led_mem_readw(val & 0xffff);
     switch (addr) {
     case 0:
         s->leds = val;
diff --git a/hw/slavio_timer.c b/hw/slavio_timer.c
index c125de4..13f1e62 100644
--- a/hw/slavio_timer.c
+++ b/hw/slavio_timer.c
@@ -25,15 +25,7 @@
 #include "sun4m.h"
 #include "qemu-timer.h"
 #include "sysbus.h"
-
-//#define DEBUG_TIMER
-
-#ifdef DEBUG_TIMER
-#define DPRINTF(fmt, ...)                                       \
-    do { printf("TIMER: " fmt , ## __VA_ARGS__); } while (0)
-#else
-#define DPRINTF(fmt, ...) do {} while (0)
-#endif
+#include "trace.h"
 
 /*
  * Registers of hardware timer in sun4m.
@@ -112,8 +104,7 @@
     }
     count = limit - PERIODS_TO_LIMIT(ptimer_get_count(t->timer));
 
-    DPRINTF("get_out: limit %" PRIx64 " count %x%08x\n", t->limit, t->counthigh,
-            t->count);
+    trace_slavio_timer_get_out(t->limit, t->counthigh, t->count);
     t->count = count & TIMER_COUNT_MASK32;
     t->counthigh = count >> 32;
 }
@@ -126,7 +117,7 @@
     CPUTimerState *t = &s->cputimer[tc->timer_index];
 
     slavio_timer_get_out(t);
-    DPRINTF("callback: count %x%08x\n", t->counthigh, t->count);
+    trace_slavio_timer_irq(t->counthigh, t->count);
     /* if limit is 0 (free-run), there will be no match */
     if (t->limit != 0) {
         t->reached = TIMER_REACHED;
@@ -188,12 +179,11 @@
         ret = s->cputimer_mode;
         break;
     default:
-        DPRINTF("invalid read address " TARGET_FMT_plx "\n", addr);
+        trace_slavio_timer_mem_readl_invalid(addr);
         ret = 0;
         break;
     }
-    DPRINTF("read " TARGET_FMT_plx " = %08x\n", addr, ret);
-
+    trace_slavio_timer_mem_readl(addr, ret);
     return ret;
 }
 
@@ -206,7 +196,7 @@
     unsigned int timer_index = tc->timer_index;
     CPUTimerState *t = &s->cputimer[timer_index];
 
-    DPRINTF("write " TARGET_FMT_plx " %08x\n", addr, val);
+    trace_slavio_timer_mem_writel(addr, val);
     saddr = addr >> 2;
     switch (saddr) {
     case TIMER_LIMIT:
@@ -218,8 +208,7 @@
             t->counthigh = val & (TIMER_MAX_COUNT64 >> 32);
             t->reached = 0;
             count = ((uint64_t)t->counthigh << 32) | t->count;
-            DPRINTF("processor %d user timer set to %016" PRIx64 "\n",
-                    timer_index, count);
+            trace_slavio_timer_mem_writel_limit(timer_index, count);
             ptimer_set_count(t->timer, LIMIT_TO_PERIODS(t->limit - count));
         } else {
             // set limit, reset counter
@@ -244,11 +233,11 @@
             t->count = val & TIMER_MAX_COUNT64;
             t->reached = 0;
             count = ((uint64_t)t->counthigh) << 32 | t->count;
-            DPRINTF("processor %d user timer set to %016" PRIx64 "\n",
-                    timer_index, count);
+            trace_slavio_timer_mem_writel_limit(timer_index, count);
             ptimer_set_count(t->timer, LIMIT_TO_PERIODS(t->limit - count));
-        } else
-            DPRINTF("not user timer\n");
+        } else {
+            trace_slavio_timer_mem_writel_counter_invalid();
+        }
         break;
     case TIMER_COUNTER_NORST:
         // set limit without resetting counter
@@ -263,13 +252,11 @@
         if (slavio_timer_is_user(tc)) {
             // start/stop user counter
             if ((val & 1) && !t->running) {
-                DPRINTF("processor %d user timer started\n",
-                        timer_index);
+                trace_slavio_timer_mem_writel_status_start(timer_index);
                 ptimer_run(t->timer, 0);
                 t->running = 1;
             } else if (!(val & 1) && t->running) {
-                DPRINTF("processor %d user timer stopped\n",
-                        timer_index);
+                trace_slavio_timer_mem_writel_status_stop(timer_index);
                 ptimer_stop(t->timer);
                 t->running = 0;
             }
@@ -298,8 +285,7 @@
                         // set this processors user timer bit in config
                         // register
                         s->cputimer_mode |= processor;
-                        DPRINTF("processor %d changed from counter to user "
-                                "timer\n", timer_index);
+                        trace_slavio_timer_mem_writel_mode_user(timer_index);
                     } else { // user timer -> counter
                         // stop the user timer if it is running
                         if (curr_timer->running) {
@@ -311,17 +297,16 @@
                         // clear this processors user timer bit in config
                         // register
                         s->cputimer_mode &= ~processor;
-                        DPRINTF("processor %d changed from user timer to "
-                                "counter\n", timer_index);
+                        trace_slavio_timer_mem_writel_mode_counter(timer_index);
                     }
                 }
             }
         } else {
-            DPRINTF("not system timer\n");
+            trace_slavio_timer_mem_writel_mode_invalid();
         }
         break;
     default:
-        DPRINTF("invalid write address " TARGET_FMT_plx "\n", addr);
+        trace_slavio_timer_mem_writel_invalid(addr);
         break;
     }
 }
diff --git a/hw/sparc32_dma.c b/hw/sparc32_dma.c
index 984ffc3..0904188 100644
--- a/hw/sparc32_dma.c
+++ b/hw/sparc32_dma.c
@@ -29,9 +29,7 @@
 #include "sparc32_dma.h"
 #include "sun4m.h"
 #include "sysbus.h"
-
-/* debug DMA */
-//#define DEBUG_DMA
+#include "trace.h"
 
 /*
  * This is the DMA controller part of chip STP2000 (Master I/O), also
@@ -41,13 +39,6 @@
  * http://www.ibiblio.org/pub/historic-linux/early-ports/Sparc/NCR/DMA2.txt
  */
 
-#ifdef DEBUG_DMA
-#define DPRINTF(fmt, ...)                               \
-    do { printf("DMA: " fmt , ## __VA_ARGS__); } while (0)
-#else
-#define DPRINTF(fmt, ...)
-#endif
-
 #define DMA_REGS 4
 #define DMA_SIZE (4 * sizeof(uint32_t))
 /* We need the mask, because one instance of the device is not page
@@ -88,9 +79,8 @@
     DMAState *s = opaque;
     int i;
 
-    DPRINTF("DMA write, direction: %c, addr 0x%8.8x\n",
-            s->dmaregs[0] & DMA_WRITE_MEM ? 'w': 'r', s->dmaregs[1]);
     addr |= s->dmaregs[3];
+    trace_ledma_memory_read(addr);
     if (do_bswap) {
         sparc_iommu_memory_read(s->iommu, addr, buf, len);
     } else {
@@ -110,9 +100,8 @@
     int l, i;
     uint16_t tmp_buf[32];
 
-    DPRINTF("DMA read, direction: %c, addr 0x%8.8x\n",
-            s->dmaregs[0] & DMA_WRITE_MEM ? 'w': 'r', s->dmaregs[1]);
     addr |= s->dmaregs[3];
+    trace_ledma_memory_write(addr);
     if (do_bswap) {
         sparc_iommu_memory_write(s->iommu, addr, buf, len);
     } else {
@@ -139,14 +128,14 @@
     if (level) {
         s->dmaregs[0] |= DMA_INTR;
         if (s->dmaregs[0] & DMA_INTREN) {
-            DPRINTF("Raise IRQ\n");
+            trace_sparc32_dma_set_irq_raise();
             qemu_irq_raise(s->irq);
         }
     } else {
         if (s->dmaregs[0] & DMA_INTR) {
             s->dmaregs[0] &= ~DMA_INTR;
             if (s->dmaregs[0] & DMA_INTREN) {
-                DPRINTF("Lower IRQ\n");
+                trace_sparc32_dma_set_irq_lower();
                 qemu_irq_lower(s->irq);
             }
         }
@@ -157,8 +146,7 @@
 {
     DMAState *s = opaque;
 
-    DPRINTF("DMA read, direction: %c, addr 0x%8.8x\n",
-            s->dmaregs[0] & DMA_WRITE_MEM ? 'w': 'r', s->dmaregs[1]);
+    trace_espdma_memory_read(s->dmaregs[1]);
     sparc_iommu_memory_read(s->iommu, s->dmaregs[1], buf, len);
     s->dmaregs[1] += len;
 }
@@ -167,8 +155,7 @@
 {
     DMAState *s = opaque;
 
-    DPRINTF("DMA write, direction: %c, addr 0x%8.8x\n",
-            s->dmaregs[0] & DMA_WRITE_MEM ? 'w': 'r', s->dmaregs[1]);
+    trace_espdma_memory_write(s->dmaregs[1]);
     sparc_iommu_memory_write(s->iommu, s->dmaregs[1], buf, len);
     s->dmaregs[1] += len;
 }
@@ -179,9 +166,7 @@
     uint32_t saddr;
 
     saddr = (addr & DMA_MASK) >> 2;
-    DPRINTF("read dmareg " TARGET_FMT_plx ": 0x%8.8x\n", addr,
-            s->dmaregs[saddr]);
-
+    trace_sparc32_dma_mem_readl(addr, s->dmaregs[saddr]);
     return s->dmaregs[saddr];
 }
 
@@ -191,18 +176,17 @@
     uint32_t saddr;
 
     saddr = (addr & DMA_MASK) >> 2;
-    DPRINTF("write dmareg " TARGET_FMT_plx ": 0x%8.8x -> 0x%8.8x\n", addr,
-            s->dmaregs[saddr], val);
+    trace_sparc32_dma_mem_writel(addr, s->dmaregs[saddr], val);
     switch (saddr) {
     case 0:
         if (val & DMA_INTREN) {
             if (s->dmaregs[0] & DMA_INTR) {
-                DPRINTF("Raise IRQ\n");
+                trace_sparc32_dma_set_irq_raise();
                 qemu_irq_raise(s->irq);
             }
         } else {
             if (s->dmaregs[0] & (DMA_INTR | DMA_INTREN)) {
-                DPRINTF("Lower IRQ\n");
+                trace_sparc32_dma_set_irq_lower();
                 qemu_irq_lower(s->irq);
             }
         }
@@ -215,10 +199,10 @@
             val = DMA_DRAIN_FIFO;
 
         if (val & DMA_EN && !(s->dmaregs[0] & DMA_EN)) {
-            DPRINTF("Raise DMA enable\n");
+            trace_sparc32_dma_enable_raise();
             qemu_irq_raise(s->gpio[GPIO_DMA]);
         } else if (!(val & DMA_EN) && !!(s->dmaregs[0] & DMA_EN)) {
-            DPRINTF("Lower DMA enable\n");
+            trace_sparc32_dma_enable_lower();
             qemu_irq_lower(s->gpio[GPIO_DMA]);
         }
 
diff --git a/hw/sun4m.c b/hw/sun4m.c
index 0392109..4795b3f 100644
--- a/hw/sun4m.c
+++ b/hw/sun4m.c
@@ -41,8 +41,7 @@
 #include "loader.h"
 #include "elf.h"
 #include "blockdev.h"
-
-//#define DEBUG_IRQ
+#include "trace.h"
 
 /*
  * Sun4m architecture was used in the following machines:
@@ -72,13 +71,6 @@
  * See for example: http://www.sunhelp.org/faq/sunref1.html
  */
 
-#ifdef DEBUG_IRQ
-#define DPRINTF(fmt, ...)                                       \
-    do { printf("CPUIRQ: " fmt , ## __VA_ARGS__); } while (0)
-#else
-#define DPRINTF(fmt, ...)
-#endif
-
 #define KERNEL_LOAD_ADDR     0x00004000
 #define CMDLINE_ADDR         0x007ff000
 #define INITRD_LOAD_ADDR     0x00800000
@@ -248,14 +240,14 @@
 
                 env->interrupt_index = TT_EXTINT | i;
                 if (old_interrupt != env->interrupt_index) {
-                    DPRINTF("Set CPU IRQ %d\n", i);
+                    trace_sun4m_cpu_interrupt(i);
                     cpu_interrupt(env, CPU_INTERRUPT_HARD);
                 }
                 break;
             }
         }
     } else if (!env->pil_in && (env->interrupt_index & ~15) == TT_EXTINT) {
-        DPRINTF("Reset CPU IRQ %d\n", env->interrupt_index & 15);
+        trace_sun4m_cpu_reset_interrupt(env->interrupt_index & 15);
         env->interrupt_index = 0;
         cpu_reset_interrupt(env, CPU_INTERRUPT_HARD);
     }
@@ -266,12 +258,12 @@
     CPUState *env = opaque;
 
     if (level) {
-        DPRINTF("Raise CPU IRQ %d\n", irq);
+        trace_sun4m_cpu_set_irq_raise(irq);
         env->halted = 0;
         env->pil_in |= 1 << irq;
         cpu_check_irqs(env);
     } else {
-        DPRINTF("Lower CPU IRQ %d\n", irq);
+        trace_sun4m_cpu_set_irq_lower(irq);
         env->pil_in &= ~(1 << irq);
         cpu_check_irqs(env);
     }
diff --git a/hw/sun4m_iommu.c b/hw/sun4m_iommu.c
index 1dbe077..720ee3f 100644
--- a/hw/sun4m_iommu.c
+++ b/hw/sun4m_iommu.c
@@ -24,16 +24,7 @@
 
 #include "sun4m.h"
 #include "sysbus.h"
-
-/* debug iommu */
-//#define DEBUG_IOMMU
-
-#ifdef DEBUG_IOMMU
-#define DPRINTF(fmt, ...)                                       \
-    do { printf("IOMMU: " fmt , ## __VA_ARGS__); } while (0)
-#else
-#define DPRINTF(fmt, ...)
-#endif
+#include "trace.h"
 
 /*
  * I/O MMU used by Sun4m systems
@@ -160,7 +151,7 @@
         qemu_irq_lower(s->irq);
         break;
     }
-    DPRINTF("read reg[%d] = %x\n", (int)saddr, ret);
+    trace_sun4m_iommu_mem_readl(saddr, ret);
     return ret;
 }
 
@@ -171,7 +162,7 @@
     target_phys_addr_t saddr;
 
     saddr = addr >> 2;
-    DPRINTF("write reg[%d] = %x\n", (int)saddr, val);
+    trace_sun4m_iommu_mem_writel(saddr, val);
     switch (saddr) {
     case IOMMU_CTRL:
         switch (val & IOMMU_CTRL_RNGE) {
@@ -201,18 +192,18 @@
             s->iostart = 0xffffffff80000000ULL;
             break;
         }
-        DPRINTF("iostart = " TARGET_FMT_plx "\n", s->iostart);
+        trace_sun4m_iommu_mem_writel_ctrl(s->iostart);
         s->regs[saddr] = ((val & IOMMU_CTRL_MASK) | s->version);
         break;
     case IOMMU_BASE:
         s->regs[saddr] = val & IOMMU_BASE_MASK;
         break;
     case IOMMU_TLBFLUSH:
-        DPRINTF("tlb flush %x\n", val);
+        trace_sun4m_iommu_mem_writel_tlbflush(val);
         s->regs[saddr] = val & IOMMU_TLBFLUSH_MASK;
         break;
     case IOMMU_PGFLUSH:
-        DPRINTF("page flush %x\n", val);
+        trace_sun4m_iommu_mem_writel_pgflush(val);
         s->regs[saddr] = val & IOMMU_PGFLUSH_MASK;
         break;
     case IOMMU_AFAR:
@@ -262,18 +253,14 @@
 {
     uint32_t ret;
     target_phys_addr_t iopte;
-#ifdef DEBUG_IOMMU
     target_phys_addr_t pa = addr;
-#endif
 
     iopte = s->regs[IOMMU_BASE] << 4;
     addr &= ~s->iostart;
     iopte += (addr >> (IOMMU_PAGE_SHIFT - 2)) & ~3;
     cpu_physical_memory_read(iopte, (uint8_t *)&ret, 4);
     tswap32s(&ret);
-    DPRINTF("get flags addr " TARGET_FMT_plx " => pte " TARGET_FMT_plx
-            ", *pte = %x\n", pa, iopte, ret);
-
+    trace_sun4m_iommu_page_get_flags(pa, iopte, ret);
     return ret;
 }
 
@@ -283,16 +270,14 @@
     target_phys_addr_t pa;
 
     pa = ((pte & IOPTE_PAGE) << 4) + (addr & ~IOMMU_PAGE_MASK);
-    DPRINTF("xlate dva " TARGET_FMT_plx " => pa " TARGET_FMT_plx
-            " (iopte = %x)\n", addr, pa, pte);
-
+    trace_sun4m_iommu_translate_pa(addr, pa, pte);
     return pa;
 }
 
 static void iommu_bad_addr(IOMMUState *s, target_phys_addr_t addr,
                            int is_write)
 {
-    DPRINTF("bad addr " TARGET_FMT_plx "\n", addr);
+    trace_sun4m_iommu_bad_addr(addr);
     s->regs[IOMMU_AFSR] = IOMMU_AFSR_ERR | IOMMU_AFSR_LE | IOMMU_AFSR_RESV |
         IOMMU_AFSR_FAV;
     if (!is_write)
diff --git a/trace-events b/trace-events
index ed2055e..947f8b0 100644
--- a/trace-events
+++ b/trace-events
@@ -81,3 +81,111 @@
 disable apic_reset_irq_delivered(int apic_irq_delivered) "old coalescing %d"
 disable apic_get_irq_delivered(int apic_irq_delivered) "returning coalescing %d"
 disable apic_set_irq(int apic_irq_delivered) "coalescing %d"
+
+# hw/cs4231.c
+disable cs4231_mem_readl_dreg(uint32_t reg, uint32_t ret) "read dreg %d: 0x%02x"
+disable cs4231_mem_readl_reg(uint32_t reg, uint32_t ret) "read reg %d: 0x%08x"
+disable cs4231_mem_writel_reg(uint32_t reg, uint32_t old, uint32_t val) "write reg %d: 0x%08x -> 0x%08x"
+disable cs4231_mem_writel_dreg(uint32_t reg, uint32_t old, uint32_t val) "write dreg %d: 0x%02x -> 0x%02x"
+
+# hw/eccmemctl.c
+disable ecc_mem_writel_mer(uint32_t val) "Write memory enable %08x"
+disable ecc_mem_writel_mdr(uint32_t val) "Write memory delay %08x"
+disable ecc_mem_writel_mfsr(uint32_t val) "Write memory fault status %08x"
+disable ecc_mem_writel_vcr(uint32_t val) "Write slot configuration %08x"
+disable ecc_mem_writel_dr(uint32_t val) "Write diagnostic %08x"
+disable ecc_mem_writel_ecr0(uint32_t val) "Write event count 1 %08x"
+disable ecc_mem_writel_ecr1(uint32_t val) "Write event count 2 %08x"
+disable ecc_mem_readl_mer(uint32_t ret) "Read memory enable %08x"
+disable ecc_mem_readl_mdr(uint32_t ret) "Read memory delay %08x"
+disable ecc_mem_readl_mfsr(uint32_t ret) "Read memory fault status %08x"
+disable ecc_mem_readl_vcr(uint32_t ret) "Read slot configuration %08x"
+disable ecc_mem_readl_mfar0(uint32_t ret) "Read memory fault address 0 %08x"
+disable ecc_mem_readl_mfar1(uint32_t ret) "Read memory fault address 1 %08x"
+disable ecc_mem_readl_dr(uint32_t ret) "Read diagnostic %08x"
+disable ecc_mem_readl_ecr0(uint32_t ret) "Read event count 1 %08x"
+disable ecc_mem_readl_ecr1(uint32_t ret) "Read event count 2 %08x"
+disable ecc_diag_mem_writeb(uint64_t addr, uint32_t val) "Write diagnostic %"PRId64" = %02x"
+disable ecc_diag_mem_readb(uint64_t addr, uint32_t ret) "Read diagnostic %"PRId64"= %02x"
+
+# hw/lance.c
+disable lance_mem_readw(uint64_t addr, uint32_t ret) "addr=%"PRIx64"val=0x%04x"
+disable lance_mem_writew(uint64_t addr, uint32_t val) "addr=%"PRIx64"val=0x%04x"
+
+# hw/slavio_intctl.c
+disable slavio_intctl_mem_readl(uint32_t cpu, uint64_t addr, uint32_t ret) "read cpu %d reg 0x%"PRIx64" = %x"
+disable slavio_intctl_mem_writel(uint32_t cpu, uint64_t addr, uint32_t val) "write cpu %d reg 0x%"PRIx64" = %x"
+disable slavio_intctl_mem_writel_clear(uint32_t cpu, uint32_t val, uint32_t intreg_pending) "Cleared cpu %d irq mask %x, curmask %x"
+disable slavio_intctl_mem_writel_set(uint32_t cpu, uint32_t val, uint32_t intreg_pending) "Set cpu %d irq mask %x, curmask %x"
+disable slavio_intctlm_mem_readl(uint64_t addr, uint32_t ret) "read system reg 0x%"PRIx64" = %x"
+disable slavio_intctlm_mem_writel(uint64_t addr, uint32_t val) "write system reg 0x%"PRIx64" = %x"
+disable slavio_intctlm_mem_writel_enable(uint32_t val, uint32_t intregm_disabled) "Enabled master irq mask %x, curmask %x"
+disable slavio_intctlm_mem_writel_disable(uint32_t val, uint32_t intregm_disabled) "Disabled master irq mask %x, curmask %x"
+disable slavio_intctlm_mem_writel_target(uint32_t cpu) "Set master irq cpu %d"
+disable slavio_check_interrupts(uint32_t pending, uint32_t intregm_disabled) "pending %x disabled %x"
+disable slavio_set_irq(uint32_t target_cpu, int irq, uint32_t pil, int level) "Set cpu %d irq %d -> pil %d level %d"
+disable slavio_set_timer_irq_cpu(int cpu, int level) "Set cpu %d local timer level %d"
+
+# hw/slavio_misc.c
+disable slavio_misc_update_irq_raise(void) "Raise IRQ"
+disable slavio_misc_update_irq_lower(void) "Lower IRQ"
+disable slavio_set_power_fail(int power_failing, uint8_t config) "Power fail: %d, config: %d"
+disable slavio_cfg_mem_writeb(uint32_t val) "Write config %02x"
+disable slavio_cfg_mem_readb(uint32_t ret) "Read config %02x"
+disable slavio_diag_mem_writeb(uint32_t val) "Write diag %02x"
+disable slavio_diag_mem_readb(uint32_t ret) "Read diag %02x"
+disable slavio_mdm_mem_writeb(uint32_t val) "Write modem control %02x"
+disable slavio_mdm_mem_readb(uint32_t ret) "Read modem control %02x"
+disable slavio_aux1_mem_writeb(uint32_t val) "Write aux1 %02x"
+disable slavio_aux1_mem_readb(uint32_t ret) "Read aux1 %02x"
+disable slavio_aux2_mem_writeb(uint32_t val) "Write aux2 %02x"
+disable slavio_aux2_mem_readb(uint32_t ret) "Read aux2 %02x"
+disable apc_mem_writeb(uint32_t val) "Write power management %02x"
+disable apc_mem_readb(uint32_t ret) "Read power management %02x"
+disable slavio_sysctrl_mem_writel(uint32_t val) "Write system control %08x"
+disable slavio_sysctrl_mem_readl(uint32_t ret) "Read system control %08x"
+disable slavio_led_mem_writew(uint32_t val) "Write diagnostic LED %04x"
+disable slavio_led_mem_readw(uint32_t ret) "Read diagnostic LED %04x"
+
+# hw/slavio_timer.c
+disable slavio_timer_get_out(uint64_t limit, uint32_t counthigh, uint32_t count) "limit %"PRIx64" count %x%08x"
+disable slavio_timer_irq(uint32_t counthigh, uint32_t count) "callback: count %x%08x"
+disable slavio_timer_mem_readl_invalid(uint64_t addr) "invalid read address %"PRIx64""
+disable slavio_timer_mem_readl(uint64_t addr, uint32_t ret) "read %"PRIx64" = %08x"
+disable slavio_timer_mem_writel(uint64_t addr, uint32_t val) "write %"PRIx64" = %08x"
+disable slavio_timer_mem_writel_limit(unsigned int timer_index, uint64_t count) "processor %d user timer set to %016"PRIx64""
+disable slavio_timer_mem_writel_counter_invalid(void) "not user timer"
+disable slavio_timer_mem_writel_status_start(unsigned int timer_index) "processor %d user timer started"
+disable slavio_timer_mem_writel_status_stop(unsigned int timer_index) "processor %d user timer stopped"
+disable slavio_timer_mem_writel_mode_user(unsigned int timer_index) "processor %d changed from counter to user timer"
+disable slavio_timer_mem_writel_mode_counter(unsigned int timer_index) "processor %d changed from user timer to counter"
+disable slavio_timer_mem_writel_mode_invalid(void) "not system timer"
+disable slavio_timer_mem_writel_invalid(uint64_t addr) "invalid write address %"PRIx64""
+
+# hw/sparc32_dma.c
+disable ledma_memory_read(uint64_t addr) "DMA read addr 0x%"PRIx64""
+disable ledma_memory_write(uint64_t addr) "DMA write addr 0x%"PRIx64""
+disable sparc32_dma_set_irq_raise(void) "Raise IRQ"
+disable sparc32_dma_set_irq_lower(void) "Lower IRQ"
+disable espdma_memory_read(uint32_t addr) "DMA read addr 0x%08x"
+disable espdma_memory_write(uint32_t addr) "DMA write addr 0x%08x"
+disable sparc32_dma_mem_readl(uint64_t addr, uint32_t ret) "read dmareg %"PRIx64": 0x%08x"
+disable sparc32_dma_mem_writel(uint64_t addr, uint32_t old, uint32_t val) "write dmareg %"PRIx64": 0x%08x -> 0x%08x"
+disable sparc32_dma_enable_raise(void) "Raise DMA enable"
+disable sparc32_dma_enable_lower(void) "Lower DMA enable"
+
+# hw/sun4m.c
+disable sun4m_cpu_interrupt(unsigned int level) "Set CPU IRQ %d"
+disable sun4m_cpu_reset_interrupt(unsigned int level) "Reset CPU IRQ %d"
+disable sun4m_cpu_set_irq_raise(int level) "Raise CPU IRQ %d"
+disable sun4m_cpu_set_irq_lower(int level) "Lower CPU IRQ %d"
+
+# hw/sun4m_iommu.c
+disable sun4m_iommu_mem_readl(uint64_t addr, uint32_t ret) "read reg[%"PRIx64"] = %x"
+disable sun4m_iommu_mem_writel(uint64_t addr, uint32_t val) "write reg[%"PRIx64"] = %x"
+disable sun4m_iommu_mem_writel_ctrl(uint64_t iostart) "iostart = %"PRIx64""
+disable sun4m_iommu_mem_writel_tlbflush(uint32_t val) "tlb flush %x"
+disable sun4m_iommu_mem_writel_pgflush(uint32_t val) "page flush %x"
+disable sun4m_iommu_page_get_flags(uint64_t pa, uint64_t iopte, uint32_t ret) "get flags addr %"PRIx64" => pte %"PRIx64", *pte = %x"
+disable sun4m_iommu_translate_pa(uint64_t addr, uint64_t pa, uint32_t iopte) "xlate dva %"PRIx64" => pa %"PRIx64" iopte = %x"
+disable sun4m_iommu_bad_addr(uint64_t addr) "bad addr %"PRIx64""