Added support for Cygwin.

c/src/exec/score/cpu/unix/cpu.c

@@ -99,7 +99,9 @@ void _CPU_ISR_From_CPU_Init()
   (void) sigfillset(&_CPU_Signal_mask);
   (void) sigdelset(&_CPU_Signal_mask, SIGTRAP);
   (void) sigdelset(&_CPU_Signal_mask, SIGABRT);
+#if !defined(__CYGWIN__)
   (void) sigdelset(&_CPU_Signal_mask, SIGIOT);
+#endif
   (void) sigdelset(&_CPU_Signal_mask, SIGCONT);
   (void) sigdelset(&_CPU_Signal_mask, SIGSEGV);
   (void) sigdelset(&_CPU_Signal_mask, SIGBUS);
@@ -806,7 +808,9 @@ void _CPU_Stray_signal(int sig_num)
       case SIGBUS:
       case SIGSEGV:
       case SIGTERM:
+#if !defined(__CYGWIN__)
       case SIGIOT:
+#endif
         _CPU_Fatal_error(0x100 + sig_num);
   }
 }

c/src/exec/score/cpu/unix/rtems/score/cpu.h

@@ -378,7 +378,7 @@ extern "C" {
 #endif
  
 /*
- *  For Linux 1.1
+ *  For i386 targets
  */
  
 #ifdef RTEMS_UNIXLIB
@@ -389,7 +389,18 @@ extern "C" {
 #define ESP_OFF    3
 #define ESI_OFF    4
 #define EDI_OFF    5
+#elif defined(__CYGWIN__)
+#define EAX_OFF    0
+#define EBX_OFF    1
+#define ECX_OFF    2
+#define EDX_OFF    3
+#define ESI_OFF    4
+#define EDI_OFF    5
+#define EBP_OFF    6
+#define ESP_OFF    7
+#define RET_OFF    8
 #else
+/* Linux */
 #define EBX_OFF    0
 #define ESI_OFF    1
 #define EDI_OFF    2

c/src/exec/score/cpu/unix/rtems/score/unix.h

@@ -37,13 +37,13 @@ extern "C" {
  
 #define CPU_MODEL_NAME  "Solaris"
  
-#elif defined(__linux__)
+#elif defined(__linux__) || defined(linux)
  
 #define CPU_MODEL_NAME  "Linux"
  
-#elif defined(linux)
+#elif defined(__CYGWIN__)
  
-#define CPU_MODEL_NAME  "Linux"
+#define CPU_MODEL_NAME  "Cygwin"
  
 #elif defined(__FreeBSD__)
  

c/src/lib/libc/termios.c

@@ -28,7 +28,6 @@
  *  FreeBSD does not support a full POSIX termios so we have to help it out
  */
 
-
 #if defined(__FreeBSD__)
 #define XTABS   0
 #define ONLRET  0
@@ -40,6 +39,14 @@
 #define IUCLC   0
 #endif
 
+/*
+ *  Cygwin does not define these
+ */
+
+#if defined(__CYGWIN__)
+#define ECHOPRT 0
+#endif
+
 /*
  * The size of the cooked buffer
  */