gdb/

[deliverable/binutils-gdb.git] / gdb / arm-wince-tdep.c

diff --git a/gdb/arm-wince-tdep.c b/gdb/arm-wince-tdep.c
index 46d877055aa078c212038fc24d730c8c66047c69..3e293469acfaa39bde1843a2b77759aa83097c58 100644 (file)
--- a/gdb/arm-wince-tdep.c
+++ b/gdb/arm-wince-tdep.c
@@ -1,7 +1,7 @@
 /* Target-dependent code for Windows CE running on ARM processors,
    for GDB.
 
-   Copyright (C) 2007, 2008, 2009 Free Software Foundation, Inc.
+   Copyright (C) 2007, 2008, 2009, 2010, 2011 Free Software Foundation, Inc.
 
    This file is part of GDB.
 
@@ -77,6 +77,40 @@ arm_pe_skip_trampoline_code (struct frame_info *frame, CORE_ADDR pc)
   return arm_skip_stub (frame, pc);
 }
 
+/* GCC emits a call to __gccmain in the prologue of main.
+
+   The function below examines the code pointed at by PC and checks to
+   see if it corresponds to a call to __gccmain.  If so, it returns
+   the address of the instruction following that call.  Otherwise, it
+   simply returns PC.  */
+
+CORE_ADDR
+arm_wince_skip_main_prologue (struct gdbarch *gdbarch, CORE_ADDR pc)
+{
+  enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
+  ULONGEST this_instr;
+
+  this_instr = read_memory_unsigned_integer (pc, 4, byte_order);
+
+  /* bl offset <__gccmain> */
+  if ((this_instr & 0xfff00000) == 0xeb000000)
+    {
+#define sign_extend(V, N) \
+  (((long) (V) ^ (1L << ((N) - 1))) - (1L << ((N) - 1)))
+
+      long offset = sign_extend (this_instr & 0x000fffff, 23) << 2;
+      CORE_ADDR call_dest = (pc + 8 + offset) & 0xffffffffU;
+      struct minimal_symbol *s = lookup_minimal_symbol_by_pc (call_dest);
+
+      if (s != NULL
+         && SYMBOL_LINKAGE_NAME (s) != NULL
+         && strcmp (SYMBOL_LINKAGE_NAME (s), "__gccmain") == 0)
+       pc += 4;
+    }
+
+  return pc;
+}
+
 static void
 arm_wince_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
 {
@@ -102,6 +136,13 @@ arm_wince_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
 
   /* Single stepping.  */
   set_gdbarch_software_single_step (gdbarch, arm_software_single_step);
+
+  /* Skip call to __gccmain that gcc places in main.  */
+  set_gdbarch_skip_main_prologue (gdbarch, arm_wince_skip_main_prologue);
+
+  /* Canonical paths on this target look like `\Windows\coredll.dll',
+     for example.  */
+  set_gdbarch_has_dos_based_file_system (gdbarch, 1);
 }
 
 static enum gdb_osabi