X-Git-Url: http://drtracing.org/?a=blobdiff_plain;f=gdb%2Farm-wince-tdep.c;h=6540f2ff4744584d2c607c07dfbd3ccaefed6d6c;hb=35fd2deb6916e972248d52b1bc1d584fa9059f8f;hp=423589655d2ebf11f9110c43ab5eca78869b2bbb;hpb=8ad7c2b9e66715bcd6affca86a6fba7584686d3b;p=deliverable%2Fbinutils-gdb.git

diff --git a/gdb/arm-wince-tdep.c b/gdb/arm-wince-tdep.c
index 423589655d..6540f2ff47 100644
--- 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 Free Software Foundation, Inc.
+   Copyright (C) 2007-2016 Free Software Foundation, Inc.
 
    This file is part of GDB.
 
@@ -20,25 +20,105 @@
 
 #include "defs.h"
 #include "osabi.h"
-#include "solib-svr4.h"
+#include "gdbcore.h"
 #include "target.h"
+#include "frame.h"
 
-#include "gdb_string.h"
-
+#include "arch/arm.h"
 #include "arm-tdep.h"
+#include "windows-tdep.h"
 
-static const char arm_wince_le_breakpoint[] = { 0x10, 0x00, 0x00, 0xe6 };
-static const char arm_wince_thumb_le_breakpoint[] = { 0xfe, 0xdf };
+static const gdb_byte arm_wince_le_breakpoint[] = { 0x10, 0x00, 0x00, 0xe6 };
+static const gdb_byte arm_wince_thumb_le_breakpoint[] = { 0xfe, 0xdf };
 
 /* Description of the longjmp buffer.  */
 #define ARM_WINCE_JB_ELEMENT_SIZE	INT_REGISTER_SIZE
 #define ARM_WINCE_JB_PC			10
 
+static CORE_ADDR
+arm_pe_skip_trampoline_code (struct frame_info *frame, CORE_ADDR pc)
+{
+  struct gdbarch *gdbarch = get_frame_arch (frame);
+  enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
+  ULONGEST indirect;
+  struct bound_minimal_symbol indsym;
+  const char *symname;
+  CORE_ADDR next_pc;
+
+  /* The format of an ARM DLL trampoline is:
+
+       ldr  ip, [pc]
+       ldr  pc, [ip]
+       .dw __imp_<func>
+
+  */
+
+  if (pc == 0
+      || read_memory_unsigned_integer (pc + 0, 4, byte_order) != 0xe59fc000
+      || read_memory_unsigned_integer (pc + 4, 4, byte_order) != 0xe59cf000)
+    return 0;
+
+  indirect = read_memory_unsigned_integer (pc + 8, 4, byte_order);
+  if (indirect == 0)
+    return 0;
+
+  indsym = lookup_minimal_symbol_by_pc (indirect);
+  if (indsym.minsym == NULL)
+    return 0;
+
+  symname = MSYMBOL_LINKAGE_NAME (indsym.minsym);
+  if (symname == NULL || !startswith (symname, "__imp_"))
+    return 0;
+
+  next_pc = read_memory_unsigned_integer (indirect, 4, byte_order);
+  if (next_pc != 0)
+    return next_pc;
+
+  /* Check with the default arm gdbarch_skip_trampoline.  */
+  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.  */
+
+static 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 bound_minimal_symbol s = lookup_minimal_symbol_by_pc (call_dest);
+
+      if (s.minsym != NULL
+	  && MSYMBOL_LINKAGE_NAME (s.minsym) != NULL
+	  && strcmp (MSYMBOL_LINKAGE_NAME (s.minsym), "__gccmain") == 0)
+	pc += 4;
+    }
+
+  return pc;
+}
+
 static void
 arm_wince_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
 {
   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
 
+  windows_init_abi (info, gdbarch);
+
   tdep->arm_breakpoint = arm_wince_le_breakpoint;
   tdep->arm_breakpoint_size = sizeof (arm_wince_le_breakpoint);
   tdep->thumb_breakpoint = arm_wince_thumb_le_breakpoint;
@@ -54,10 +134,13 @@ arm_wince_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
   set_gdbarch_char_signed (gdbarch, 1);
 
   /* Shared library handling.  */
-  set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target);
+  set_gdbarch_skip_trampoline_code (gdbarch, arm_pe_skip_trampoline_code);
 
   /* 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