Backtrace minor cleanup

Marlin/src/HAL/HAL_DUE/DebugMonitor_Due.cpp

@@ -75,9 +75,7 @@ static void TX(char c) {
 
 // Send String through UART
 static void TX(const char* s) {
-  while (*s) {
+  while (*s) TX(*s++);
-    TX(*s++);
-  }
 }
 
 static void TXDigit(uint32_t d) {
@@ -89,10 +87,9 @@ static void TXDigit(uint32_t d) {
 // Send Hex number thru UART
 static void TXHex(uint32_t v) {
   TX("0x");
-  for (int i=0; i<8; i++, v <<= 4) {
+  for (uint8_t i = 0; i < 8; i++, v <<= 4)
     TXDigit((v >> 28) & 0xF);
 }
-}
 
 // Send Decimal number thru UART
 static void TXDec(uint32_t v) {
@@ -125,7 +122,7 @@ static bool UnwReportOut(void* ctx, const UnwReport* bte) {
   return true;
 }
 
-#if defined(UNW_DEBUG)
+#ifdef UNW_DEBUG
   void UnwPrintf(const char* format, ...) {
     char dest[256];
     va_list argptr;

Marlin/src/backtrace/backtrace.cpp

@@ -41,7 +41,7 @@ static bool UnwReportOut(void* ctx, const UnwReport* bte) {
   return true;
 }
 
-#if defined(UNW_DEBUG)
+#ifdef UNW_DEBUG
   void UnwPrintf(const char* format, ...) {
     char dest[256];
     va_list argptr;
@@ -58,7 +58,7 @@ static const UnwindCallbacks UnwCallbacks = {
   UnwReadW,
   UnwReadH,
   UnwReadB
-#if defined(UNW_DEBUG)
+  #ifdef UNW_DEBUG
    , UnwPrintf
   #endif
 };
@@ -92,11 +92,8 @@ void backtrace(void) {
   UnwindStart(&btf, &UnwCallbacks, &ctr);
 }
 
-#else
+#else // !__arm__ && !__thumb__
 
 void backtrace(void) {}
 
 #endif
-
-
-

Marlin/src/backtrace/unwarm.cpp

@@ -25,7 +25,8 @@
 
 #if defined(UNW_DEBUG)
 
-/** Printf wrapper.
+/**
+ * Printf wrapper.
  * This is used such that alternative outputs for any output can be selected
  * by modification of this wrapper function.
  */
@@ -37,10 +38,10 @@ void UnwPrintf(const char *format, ...) {
 }
 #endif
 
-/** Invalidate all general purpose registers.
+/**
+ * Invalidate all general purpose registers.
  */
 void UnwInvalidateRegisterFile(RegData *regFile) {
-
   uint8_t t = 0;
   do {
     regFile[t].o = REG_VAL_INVALID;
@@ -49,7 +50,8 @@ void UnwInvalidateRegisterFile(RegData *regFile) {
 }
 
 
-/** Initialise the data used for unwinding.
+/**
+ * Initialise the data used for unwinding.
  */
 void UnwInitState(UnwState * const state,     /**< Pointer to structure to fill. */
                   const UnwindCallbacks *cb,  /**< Callbacks. */
@@ -77,12 +79,12 @@ void UnwInitState(UnwState * const state,     /**< Pointer to structure to fill.
 
 // Detect if function names are available
 static int __attribute__ ((noinline)) has_function_names(void) {
-
   uint32_t flag_word = ((uint32_t*)(((uint32_t)(&has_function_names)) & (-4))) [-1];
   return ((flag_word & 0xff000000) == 0xff000000) ? 1 : 0;
 }
 
-/** Call the report function to indicate some return address.
+/**
+ * Call the report function to indicate some return address.
  * This returns the value of the report function, which if true
  * indicates that unwinding may continue.
  */
@@ -108,11 +110,9 @@ bool UnwReportRetAddr(UnwState * const state, uint32_t addr) {
     while(state->cb->readW(pf-4,&v)) {
 
       // Check if name descriptor is valid
-      if ((v & 0xffffff00) == 0xff000000 &&
+      if ((v & 0xFFFFFF00) == 0xFF000000 && (v & 0xFF) > 1) {
-          (v & 0xff) > 1) {
-
         // Assume the name was found!
-        entry.name = ((const char*)pf) - 4 - (v & 0xff);
+        entry.name = ((const char*)pf) - 4 - (v & 0xFF);
         entry.function = pf;
         break;
       }
@@ -129,7 +129,8 @@ bool UnwReportRetAddr(UnwState * const state, uint32_t addr) {
 }
 
 
-/** Write some register to memory.
+/**
+ * Write some register to memory.
  * This will store some register and meta data onto the virtual stack.
  * The address for the write
  * \param state [in/out]  The unwinding state.
@@ -141,7 +142,8 @@ bool UnwMemWriteRegister(UnwState * const state, const uint32_t addr, const RegD
   return UnwMemHashWrite(&state->memData, addr, reg->v, M_IsOriginValid(reg->o));
 }
 
-/** Read a register from memory.
+/**
+ * Read a register from memory.
  * This will read a register from memory, and setup the meta data.
  * If the register has been previously written to memory using
  * UnwMemWriteRegister, the local hash will be used to return the
@@ -156,23 +158,18 @@ bool UnwMemWriteRegister(UnwState * const state, const uint32_t addr, const RegD
  *         false is the data could not be read.
  */
 bool UnwMemReadRegister(UnwState * const state, const uint32_t addr, RegData * const reg) {
-
   bool tracked;
 
-  /* Check if the value can be found in the hash */
+  // Check if the value can be found in the hash
   if (UnwMemHashRead(&state->memData, addr, &reg->v, &tracked)) {
     reg->o = tracked ? REG_VAL_FROM_MEMORY : REG_VAL_INVALID;
     return true;
   }
-  /* Not in the hash, so read from real memory */
+  else if (state->cb->readW(addr, &reg->v)) {   // Not in the hash, so read from real memory
-  else if(state->cb->readW(addr, &reg->v)) {
     reg->o = REG_VAL_FROM_MEMORY;
     return true;
   }
-  /* Not in the hash, and failed to read from memory */
+  else return false;                            // Not in the hash, and failed to read from memory
-  else {
-    return false;
-  }
 }
 #endif
 

Marlin/src/backtrace/unwinder.h

@@ -146,7 +146,7 @@ typedef struct {
    */
   bool (*readB)(const uint32_t address, uint8_t  *val);
 
-#if defined(UNW_DEBUG)
+  #ifdef UNW_DEBUG
     /** Print a formatted line for debug. */
     void (*printf)(const char *format, ...);
   #endif