org.handhelds.familiar/packages/gdb/gdb-6.3/thumb-breakpoint.patch

   1 # This patch causes gdb to use thumb swi(1) on linux for a thumb breakpoint
   2 # rather than the default, swi(254).  To stand any chance of making this
   3 # work a linux kernel patch is required to read the swi number on a thumb
   4 # swi.  In the absence of this patch gdb will effectively insert a random
   5 # swi because the kernel reads the swi number from r7...
   6 #
   7 --- gdb-6.3/gdb/arm-linux-tdep.c.orig   2005-09-19 13:55:16.486702426 -0700
   8 +++ gdb-6.3/gdb/arm-linux-tdep.c        2005-09-19 13:57:44.127992906 -0700
   9 @@ -44,6 +44,12 @@
  10
  11  static const char arm_linux_arm_be_breakpoint[] = { 0xef, 0x9f, 0x00, 0x01 };
  12
  13 +/* The following requires the corresponding patch to the kernel to recognise
  14 + * this SWI as a breakpoint.
  15 + */
  16 +static const char arm_linux_thumb_le_breakpoint[] = {0x01, 0xdf};
  17 +static const char arm_linux_thumb_be_breakpoint[] = {0xdf, 0x01};
  18 +
  19  /* Description of the longjmp buffer.  */
  20  #define ARM_LINUX_JB_ELEMENT_SIZE      INT_REGISTER_SIZE
  21  #define ARM_LINUX_JB_PC                        21
  22 @@ -463,10 +469,17 @@
  23
  24    tdep->lowest_pc = 0x8000;
  25    if (info.byte_order == BFD_ENDIAN_BIG)
  26 -    tdep->arm_breakpoint = arm_linux_arm_be_breakpoint;
  27 +    {
  28 +      tdep->arm_breakpoint = arm_linux_arm_be_breakpoint;
  29 +      tdep->thumb_breakpoint = arm_linux_thumb_be_breakpoint;
  30 +    }
  31    else
  32 -    tdep->arm_breakpoint = arm_linux_arm_le_breakpoint;
  33 +    {
  34 +      tdep->arm_breakpoint = arm_linux_arm_le_breakpoint;
  35 +      tdep->thumb_breakpoint = arm_linux_thumb_le_breakpoint;
  36 +    }
  37    tdep->arm_breakpoint_size = sizeof (arm_linux_arm_le_breakpoint);
  38 +  tdep->thumb_breakpoint_size = sizeof (arm_linux_thumb_le_breakpoint);
  39
  40    tdep->fp_model = ARM_FLOAT_FPA;
  41