====== lDebug release 5 ======

**2023-03-08**

The lDebug release 5 is imminent. Update: The release is done, grab packages at https://pushbx.org/ecm/download/ldebug/ or the source at https://hg.pushbx.org/ecm/ldebug/rev/release5

===== =====

It brings several new features:

  * Support for 40-column displays in the R, U, D, and E commands
  * Expression types
  * The QA and QB and QC and QD commands
  * RC buffer commands
  * The RVP and RVD commands
  * The device driver mode
  * The conditionally debuggable lCDebug build option
  * Dual code segments build option
  * Sharing serial IRQs
  * The TAKEN and NOTTAKEN keywords
  * Debugger exception areas and AMIS private function 33h
  * The CLR operator
  * Variables to control the default length of U and D commands
  * INSTALL and UNINSTALL commands
  * Descriptor modification commands
  * Query patch support for bootloaded mode
  * MMX  support commands fixed
  * ''IF EXISTS R variable THEN'' command

It also has a number of bugfixes, including:

  * lDebugX in PM handles 32-bit offsets correctly more often, detects use of 32-bit offsets from limits > FFFFh
  * Use of the scratch selector works in some cases where it would have failed
  * R write memory variable command doesn't crash for values ending in FFFFh anymore
  * A range parameter can be ended by a semicolon comment indicator
  * Interrupt 19h call while in application mode now sets up registers to terminate the process on the next trace step
  * Current PSP is read and written using the SDA even in PM
  * Empty binaries now cause an error even if the DOS incorrectly handles them (FreeDOS kernel bug)
  * No longer crash in init if there's no UMCB but int 21.5803 is supported
  * Do not crash in init if int 2Fh is not initialised
  * WHILE condition not checked if pass or non-pass permanent breakpoint runs
  * The ldebug.txt file is now converted to CR LF line endings immediately after Halibut has created it
  * Command line tail in PSP also set up for loading .BIN files
  * Empty /C switch does not cause an error
  * Terminate properly on reaching the end of a stdin file
  * AAM and AAD do not display an operand in disassembly if it would be ''0A''
  * RC buffer execution is aborted by a Control-C
  * XMS Protected Mode entrypoint is no longer used by default
  * ''r f .'' works
  * Bootloaded sector read that crosses a 64 KiB DMA boundary copies correct amount of data from transfer buffer
  * ''u(bootldpunit).(bootldppart)'' works even if LDP is a diskette file system
  * Serial IRQ handler passes on call if its IRQ isn't set in the In-Service Register of the PIC
  * RC command line parsing skips leading blanks
  * Double slash without subsequent command line allowed for ''BOOT PROTOCOL'' command
  * E and A commands in PM display original selector even if actually writing through the debugger's scratch selector
  * C command never uses debugger's scratch selector (and does not display it either)
  * Do not fault if scratch selector got a low limit in some way
  * ''BOOT PROTOCOL'' command always allows use of ENTRY and BPB parameters
  * Allow all address specifications for M command
  * Disassemble ''mov'' with segreg and memory operand as always m16
  * Allow operators between ''??'' and ''::'' in H command
  * Allow single-digit interrupt number for RIxxy variables
  * Disabling string instruction simulation now assumes count as 1 for the access variables
  * Operand size prefix disassembled as part of a ''push'' or ''pop'' with segreg
  * Do not simulate string instruction on U command
  * lDebugX preserves scratch selector across ''getexpression'' calls
  * lDebugX TSR command works in PM
  * Set sleep delta limit to 5 to work around idle function needing more than 1 timer tick
  * Allow bootloaded debugger to access small FAT32 file systems (below 64 Ki clusters)
  * Q or QA could fail due to corrupting the client stack in the PM interrupt 21h handler
  * Access variables for ''int'' instructions select size based on mode, ignore operand-size of the instruction
  * Fix S command error if search mask is longer than search area
  * Support ''EXECUTING'' keyword on non-386 machines
  * Allow access to ''VD'' variable using R command
  * Creating a process resets the DTA
  * Bootloaded init relocation could corrupt part of the debugger in an unlikely case
  * RM command and MMxy register reads work
{{tag>ldebug}}


~~DISCUSSION~~