initial

2017-05-26 18:45:18 +02:00
commit 27f62c4c27
186 changed files with 394089 additions and 0 deletions
--- a/system/include/arm/semihosting.h
+++ b/system/include/arm/semihosting.h
@ -0,0 +1,120 @@
+//
+// This file is part of the µOS++ III distribution.
+// Copyright (c) 2014 Liviu Ionescu.
+//
+
+#ifndef ARM_SEMIHOSTING_H_
+#define ARM_SEMIHOSTING_H_
+
+// ----------------------------------------------------------------------------
+
+// Semihosting operations.
+enum OperationNumber
+{
+  // Regular operations
+  SEMIHOSTING_EnterSVC = 0x17,
+  SEMIHOSTING_ReportException = 0x18,
+  SEMIHOSTING_SYS_CLOSE = 0x02,
+  SEMIHOSTING_SYS_CLOCK = 0x10,
+  SEMIHOSTING_SYS_ELAPSED = 0x30,
+  SEMIHOSTING_SYS_ERRNO = 0x13,
+  SEMIHOSTING_SYS_FLEN = 0x0C,
+  SEMIHOSTING_SYS_GET_CMDLINE = 0x15,
+  SEMIHOSTING_SYS_HEAPINFO = 0x16,
+  SEMIHOSTING_SYS_ISERROR = 0x08,
+  SEMIHOSTING_SYS_ISTTY = 0x09,
+  SEMIHOSTING_SYS_OPEN = 0x01,
+  SEMIHOSTING_SYS_READ = 0x06,
+  SEMIHOSTING_SYS_READC = 0x07,
+  SEMIHOSTING_SYS_REMOVE = 0x0E,
+  SEMIHOSTING_SYS_RENAME = 0x0F,
+  SEMIHOSTING_SYS_SEEK = 0x0A,
+  SEMIHOSTING_SYS_SYSTEM = 0x12,
+  SEMIHOSTING_SYS_TICKFREQ = 0x31,
+  SEMIHOSTING_SYS_TIME = 0x11,
+  SEMIHOSTING_SYS_TMPNAM = 0x0D,
+  SEMIHOSTING_SYS_WRITE = 0x05,
+  SEMIHOSTING_SYS_WRITEC = 0x03,
+  SEMIHOSTING_SYS_WRITE0 = 0x04,
+
+  // Codes returned by SEMIHOSTING_ReportException
+  ADP_Stopped_ApplicationExit = ((2 << 16) + 38),
+  ADP_Stopped_RunTimeError = ((2 << 16) + 35),
+
+};
+
+// ----------------------------------------------------------------------------
+
+// SWI numbers and reason codes for RDI (Angel) monitors.
+#define AngelSWI_ARM                    0x123456
+#ifdef __thumb__
+#define AngelSWI                        0xAB
+#else
+#define AngelSWI                        AngelSWI_ARM
+#endif
+// For thumb only architectures use the BKPT instruction instead of SWI.
+#if defined(__ARM_ARCH_7M__)     \
+    || defined(__ARM_ARCH_7EM__) \
+    || defined(__ARM_ARCH_6M__)
+#define AngelSWIInsn                    "bkpt"
+#define AngelSWIAsm                     bkpt
+#else
+#define AngelSWIInsn                    "swi"
+#define AngelSWIAsm                     swi
+#endif
+
+#if defined(OS_DEBUG_SEMIHOSTING_FAULTS)
+// Testing the local semihosting handler cannot use another BKPT, since this
+// configuration cannot trigger HaedFault exceptions while the debugger is
+// connected, so we use an illegal op code, that will trigger an
+// UsageFault exception.
+#define AngelSWITestFault       "setend be"
+#define AngelSWITestFaultOpCode (0xB658)
+#endif
+
+static inline int
+__attribute__ ((always_inline))
+call_host (int reason, void* arg)
+{
+  int value;
+  asm volatile (
+
+      " mov r0, %[rsn]  \n"
+      " mov r1, %[arg]  \n"
+#if defined(OS_DEBUG_SEMIHOSTING_FAULTS)
+      " " AngelSWITestFault " \n"
+#else
+      " " AngelSWIInsn " %[swi] \n"
+#endif
+      " mov %[val], r0"
+
+      : [val] "=r" (value) /* Outputs */
+      : [rsn] "r" (reason), [arg] "r" (arg), [swi] "i" (AngelSWI) /* Inputs */
+      : "r0", "r1", "r2", "r3", "ip", "lr", "memory", "cc"
+      // Clobbers r0 and r1, and lr if in supervisor mode
+  );
+
+  // Accordingly to page 13-77 of ARM DUI 0040D other registers
+  // can also be clobbered. Some memory positions may also be
+  // changed by a system call, so they should not be kept in
+  // registers. Note: we are assuming the manual is right and
+  // Angel is respecting the APCS.
+  return value;
+}
+
+// ----------------------------------------------------------------------------
+
+// Function used in _exit() to return the status code as Angel exception.
+static inline void
+__attribute__ ((always_inline,noreturn))
+report_exception (int reason)
+{
+  call_host (SEMIHOSTING_ReportException, (void*) reason);
+
+  for (;;)
+    ;
+}
+
+// ----------------------------------------------------------------------------
+
+#endif // ARM_SEMIHOSTING_H_