From: Pedro Alves <palves@redhat.com>
Date: Sun, 5 Jul 2009 21:23:43 +0000 (+0000)
Subject: 	* arm-wince-tdep.c (arm_wince_skip_main_prologue): New.
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=d7117c03b0aacf7135a0a638c5b6f21b3f9add9e;p=binutils-gdb.git

	* arm-wince-tdep.c (arm_wince_skip_main_prologue): New.
	(arm_wince_init_abi): Register it as gdbarch_skip_main_prologue
	callback.
---

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 92534d9aa36..609fd7227e5 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,9 @@
+2009-07-05  Pedro Alves  <pedro@codesourcery.com>
+
+	* arm-wince-tdep.c (arm_wince_skip_main_prologue): New.
+	(arm_wince_init_abi): Register it as gdbarch_skip_main_prologue
+	callback.
+
 2009-06-29  Tristan Gingold  <gingold@adacore.com>
 
 	* i386-darwin-tdep.c (amd64_darwin_thread_state_reg_offset)
diff --git a/gdb/arm-wince-tdep.c b/gdb/arm-wince-tdep.c
index 46d877055aa..bd676e32729 100644
--- a/gdb/arm-wince-tdep.c
+++ b/gdb/arm-wince-tdep.c
@@ -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 +136,9 @@ 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);
 }
 
 static enum gdb_osabi