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# This patch causes gdb to use thumb swi(1) on linux for a thumb breakpoint
# rather than the default, swi(254). To stand any chance of making this
# work a linux kernel patch is required to read the swi number on a thumb
# swi. In the absence of this patch gdb will effectively insert a random
# swi because the kernel reads the swi number from r7...
#
--- gdb-6.3/gdb/arm-linux-tdep.c.orig 2005-09-19 13:55:16.486702426 -0700
+++ gdb-6.3/gdb/arm-linux-tdep.c 2005-09-19 13:57:44.127992906 -0700
@@ -44,6 +44,12 @@
static const char arm_linux_arm_be_breakpoint[] = { 0xef, 0x9f, 0x00, 0x01 };
+/* The following requires the corresponding patch to the kernel to recognise
+ * this SWI as a breakpoint.
+ */
+static const char arm_linux_thumb_le_breakpoint[] = {0x01, 0xdf};
+static const char arm_linux_thumb_be_breakpoint[] = {0xdf, 0x01};
+
/* Description of the longjmp buffer. */
#define ARM_LINUX_JB_ELEMENT_SIZE INT_REGISTER_SIZE
#define ARM_LINUX_JB_PC 21
@@ -463,10 +469,17 @@
tdep->lowest_pc = 0x8000;
if (info.byte_order == BFD_ENDIAN_BIG)
- tdep->arm_breakpoint = arm_linux_arm_be_breakpoint;
+ {
+ tdep->arm_breakpoint = arm_linux_arm_be_breakpoint;
+ tdep->thumb_breakpoint = arm_linux_thumb_be_breakpoint;
+ }
else
- tdep->arm_breakpoint = arm_linux_arm_le_breakpoint;
+ {
+ tdep->arm_breakpoint = arm_linux_arm_le_breakpoint;
+ tdep->thumb_breakpoint = arm_linux_thumb_le_breakpoint;
+ }
tdep->arm_breakpoint_size = sizeof (arm_linux_arm_le_breakpoint);
+ tdep->thumb_breakpoint_size = sizeof (arm_linux_thumb_le_breakpoint);
tdep->fp_model = ARM_FLOAT_FPA;
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