[patch] gdbinit-6.2.diff

gdbinit-6.2.diff (text/plain), 3.13 KB, created by solar (RETIRED) on 2006-05-13 20:19:12 UTC

--- .gdbinit	2006-05-13 23:13:22.000000000 -0400
+++ .gdbinit	2006-05-13 23:14:47.000000000 -0400
@@ -2,7 +2,7 @@
 #
 # DESCRIPTION: A user-friendly gdb configuration file.
 #
-# REVISION : 6.1-gentoo
+# REVISION : 6.2-gentoo
 # 
 # CONTRIBUTORS: mammon_, elaine, pusillus, mong
 #
@@ -12,6 +12,10 @@
 #        'context on' now enables auto-display of context screen
 #
 # CHANGELOG:
+#	Version 6.2-gentoo
+#	 $SHOW_CONTEXT variable does not appear to work within defines.
+#	 so just show it always. but with dont-repeat set.
+#	 taviso - more powerful assemble macro
 #	Version 6.1-gentoo
 #	 made gas the default. some content censored to be *cough* 
 #	 politically correct. -solar
@@ -794,16 +798,8 @@
 # _____________________misc_____________________
 # this makes 'context' be called at every BP/step
 define hook-stop
- if ( $SHOW_CONTEXT > 0 )
-  context
- end
- if ( $SHOW_NEST_INSN > 0 )
-  set $x = $_nest
-  while ($x > 0 )
-   printf "\t"
-   set $x = $x - 1
-  end
- end
+ dont-repeat
+ context
 end
 
 define nasm_assemble
@@ -818,14 +814,57 @@
 Usage: nasm_assemble
 end
 
+# A more powerful assemble macro.
+# Tavis Ormandy <[e-mail]>, 8 May 2006.
 define assemble
-printf "Type code to assemble, hit Ctrl-D until results appear :)\n"
+ # dont enter routine again if user hits enter
+ dont-repeat
+ if ($argc)
+  if (*$arg0 = *$arg0)
+    # check if we have a valid address by dereferencing it,
+    # if we havnt, this will cause the routine to exit.
+  end
+  printf "Instructions will be written to %#x.\n", $arg0
+ else
+  printf "Instructions will be written to stdout.\n"
+ end
+ printf "Type instructions, one per line.\n"
+ printf "End with a line saying just \"end\".\n"
+ if ($argc)
+  # argument specified, assemble instructions into memory
+  # at address specified.
+  shell nasm -f bin -o /dev/stdout /dev/stdin \
+    <<< "$( echo "BITS 32"; while read -ep '>' r && test "$r" != end; \
+                do echo -E "$r"; done )" | hexdump -ve \
+        '1/1 "set *((unsigned char *) $arg0 + %#2_ax) = %#02x\n"' \
+            > ~/.gdbassemble
+  # load the file containing set instructions
+  source ~/.gdbassemble
+  # all done.
+  shell rm -f ~/.gdbassemble
+ else
+  # no argument, assemble instructions to stdout
+  shell nasm -f bin -o /dev/stdout /dev/stdin \
+    <<< "$( echo "BITS 32"; while read -ep '>' r && test "$r" != end; \
+                do echo -E "$r"; done )" | ndisasm -i -b32 /dev/stdin
+ end
+end
+document assemble
+Assemble instructions using nasm.
+Type a line containing "end" to indicate the end.
+If an address is specified, insert instructions at that address.
+If no address is specified, assembled instructions are printed to stdout.
+Use the pseudo instruction "org ADDR" to set the base address.
+end
+
+define gassemble
+printf "Type code to gassemble, hit Ctrl-D until results appear :)\n"
 printf "Note that this command uses GAS (AT&T syntax) to assemble.\n"
 shell as -o ~/__gdb_tmp.bin
 shell objdump -d -j .text --adjust-vma=$arg0 ~/__gdb_tmp.bin 
 shell rm ~/__gdb_tmp.bin
 end
-document assemble
+document gassemble
 Assemble Intel x86 instructions to binary opcodes using gas and objdump
 Usage: assemble address
 end