Here is a list of all files with brief descriptions:

a64_disassembler.c
a64_disassembler.h
aarch64.c
aarch64.h
adapter.c	Holds support for configuring debug adapters from TCl scripts
adapter.h
adi_v5_dapdirect.c	Utilities to support in-circuit debuggers that provide APIs to access directly ARM DAP, hiding the access to the underlining transport used for the physical connection (either JTAG or SWD)
adi_v5_jtag.c	This file implements JTAG transport support for cores implementing the ARM Debug Interface version 5 (ADIv5) and version 6 (ADIv6)
adi_v5_swd.c	Utilities to support ARM "Serial Wire Debug" (SWD), a low pin-count debug link protocol used in cases where JTAG is not wanted
aduc702x.c
aducm360.c
aice_interface.c
aice_interface.h
aice_pipe.c
aice_pipe.h
aice_port.c
aice_port.h
aice_transport.c
aice_transport.h
aice_usb.c
aice_usb.h
algorithm.c
algorithm.h
align.h
am335xgpio.c
ambiqmicro.c
amt_jtagaccel.c	Support the Amontec Chameleon POD with JTAG Accelerator support
arc.c
arc.h
arc_cmd.c
arc_cmd.h
arc_jtag.c
arc_jtag.h
arc_mem.c
arc_mem.h
arm-jtag-ew.c
arm.h	Holds the interface to ARM cores
arm11.c
arm11.h
arm11_dbgtap.c
arm11_dbgtap.h
arm720t.c
arm720t.h
arm7_9_common.c	Hold common code supporting the ARM7 and ARM9 core generations
arm7_9_common.h
arm7tdmi.c
arm7tdmi.h
arm920t.c
arm920t.h
arm926ejs.c
arm926ejs.h
arm946e.c
arm946e.h
arm966e.c
arm966e.h
arm9tdmi.c
arm9tdmi.h
arm_adi_v5.c	This file implements support for the ARM Debug Interface version 5 (ADIv5) debugging architecture
arm_adi_v5.h	This defines formats and data structures used to talk to ADIv5 entities
arm_coresight.h
arm_cti.c
arm_cti.h
arm_dap.c
arm_disassembler.c
arm_disassembler.h
arm_dpm.c	Implements various ARM DPM operations using architectural debug registers
arm_dpm.h	This is the interface to the Debug Programmers Model for ARMv6 and ARMv7 processors
arm_io.c
arm_io.h
arm_jtag.c
arm_jtag.h
arm_opcodes.h	Macros used to generate various ARM or Thumb opcodes
arm_semihosting.c	Hold ARM semihosting support
arm_semihosting.h
arm_simulator.c
arm_simulator.h
arm_tpiu_swo.c	This file implements support for the ARM CoreSight components Trace Port Interface Unit (TPIU) and Serial Wire Output (SWO)
arm_tpiu_swo.h
armv4_5.c
armv4_5.h
armv4_5_cache.c
armv4_5_cache.h
armv4_5_mmu.c
armv4_5_mmu.h
armv7a.c
armv7a.h
armv7a_cache.c
armv7a_cache.h
armv7a_cache_l2x.c
armv7a_cache_l2x.h
armv7a_mmu.c
armv7a_mmu.h
armv7m.c
armv7m.h
armv7m_trace.c
armv7m_trace.h	Holds the interface to ITM and DWT configuration functions
armv8.c
armv8.h
armv8_cache.c
armv8_cache.h
armv8_dpm.c	Implements various ARM DPM operations using architectural debug registers
armv8_dpm.h
armv8_opcodes.c
armv8_opcodes.h
asm.h
at91rm9200.c
at91sam3.c
at91sam4.c
at91sam4l.c
at91sam7.c
at91sam9.c
at91samd.c
ath79.c
atsame5.c
atsamv.c
avr32_ap7k.c
avr32_ap7k.h
avr32_jtag.c
avr32_jtag.h
avr32_mem.c
avr32_mem.h
avr32_regs.c
avr32_regs.h
avrf.c
avrt.c
avrt.h
batch.c
batch.h
bcm2835gpio.c
binarybuffer.c
binarybuffer.h	Support functions to access arbitrary bits in a byte array
bitbang.c
bitbang.h
bitq.c
bitq.h
bits.h
bluenrg-x.c
bluenrg-x.h
breakpoints.c
breakpoints.h
BUGS	This file contains the Bug Reporting page
buspirate.c
cc26xx.c
cc26xx.h
cc3220sf.c
cc3220sf.h
cfi.c
cfi.h
chibios.c
chromium-ec.c
cmsis_dap.c
cmsis_dap.h
cmsis_dap_usb_bulk.c
cmsis_dap_usb_hid.c
command.c
command.h
commands.c
commands.h
common.c
flash/common.h
jtag/drivers/OpenULINK/include/common.h
config.h
configuration.c
configuration.h
flash/nand/core.c
flash/nor/core.c	Upper level of NOR flash framework
jtag/core.c
nand/core.h
nor/core.h	Upper level NOR flash interfaces
cortex_a.c
cortex_a.h
cortex_m.c
cortex_m.h
davinci.c
debug_defines.h
delay.c
delay.h
flash/nand/driver.c
jtag/drivers/driver.c
nand/driver.h
nor/driver.h
drivers.c
dsp563xx.c
dsp563xx.h
dsp563xx_once.c
dsp563xx_once.h
dsp5680xx.c
dsp5680xx.h	Basic support for the 5680xx DSP from Freescale. The chip has two taps in the JTAG chain, the Master tap and the Core tap. In this code the Master tap is only used to unlock the flash memory by executing a JTAG instruction
dsp5680xx_flash.c	This file implements the basic functions to run flashing commands from the TCL interface. It allows the user to flash the Freescale 5680xx DSP
dummy.c
ecc.c
ecc_kw.c
eCos.c
efm32.c
em357.c
embeddedice.c	This provides lowlevel glue to the EmbeddedICE (or EmbeddedICE-RT) module found on scan chain 2 in ARM7, ARM9, and some other families of ARM cores
embeddedice.h
embKernel.c
encoding.h
ep93xx.c
esirisc.c
esirisc.h
esirisc_flash.c
esirisc_jtag.c
esirisc_jtag.h
esirisc_regs.h
esirisc_trace.c
esirisc_trace.h
esp32.c
esp32s2.c
esp32s3.c
esp_semihosting.c
esp_semihosting.h
esp_usb_jtag.c
esp_xtensa.c
esp_xtensa.h
esp_xtensa_semihosting.c
esp_xtensa_semihosting.h
esp_xtensa_smp.c
esp_xtensa_smp.h
etb.c
etb.h
etm.c
etm.h
etm_dummy.c
etm_dummy.h
fa526.c
faux.c
feroceon.c
fespi.c
flash/nand/fileio.c
helper/fileio.c
flash/nand/fileio.h
helper/fileio.h
fm3.c
fm4.c
FreeRTOS.c
ft232r.c
ftdi.c	JTAG adapters based on the FT2232 full and high speed USB parts are popular low cost JTAG debug solutions
gdb_regs.h
gdb_server.c	GDB server implementation
gdb_server.h
gw16012.c
HACKING	This file contains the Patch Guidelines page
hello.c
hello.h
hla_interface.c
hla_interface.h
hla_layout.c
hla_layout.h
hla_target.c
hla_tcl.c
hla_tcl.h
hla_transport.c
hla_transport.h
hwthread.c
image.c
image.h
nand/imp.h
nor/imp.h
imx_gpio.c
interface.c
interface.h
interfaces.c	This file includes declarations for all built-in jtag interfaces, which are then listed in the adapter_drivers array
interfaces.h	Exports the list of JTAG interface drivers, along with routines for loading and unloading them dynamically from shared libraries
io.h
ipdbg.c
ipdbg.h
jep106.c
jep106.h
jim-nvp.c
jim-nvp.h
jlink.c
jsp_server.c
jsp_server.h
jtag.c
drivers/OpenULINK/include/jtag.h
jtag.h	The JTAG interface can be implemented with a software or hardware fifo
jtag_dpi.c
jtag_vpi.c
jtagspi.c
kinetis.c
kinetis_ke.c
kitprog.c
lakemont.c
lakemont.h
libftdi_helper.h
libusb_helper.c
libusb_helper.h
linux.c
linux_header.h
linuxgpiod.c
list.h
log.c
log.h
lpc2000.c	Flash programming support for NXP LPC8xx,LPC1xxx,LPC4xxx,LP5410x,LPC2xxx and NHS31xx devices
lpc288x.c
lpc2900.c
lpc3180.c
lpc3180.h
lpc32xx.c
lpc32xx.h
lpcspifi.c
ls1_sap.c
jtag/drivers/OpenULINK/src/main.c
main.c
main.h
max32xxx.c
mdr.c
mem_ap.c
minidriver.h
minidriver_imp.h
mips32.c
mips32.h
mips32_dmaacc.c
mips32_dmaacc.h
mips32_pracc.c
mips32_pracc.h
mips64.c
mips64.h
mips64_pracc.c
mips64_pracc.h
mips_ejtag.c
mips_ejtag.h
mips_m4k.c
mips_m4k.h
mips_mips64.c
mips_mips64.h
mpsse.c
mpsse.h
mqx.c
mrvlqspi.c
msgtypes.h	Definition of the commands supported by the OpenULINK firmware
msp432.c
msp432.h
mx3.c
mx3.h
mxc.c
mxc.h
nds32.c
nds32.h	Holds the interface to Andes cores
nds32_aice.c
nds32_aice.h
nds32_cmd.c
nds32_cmd.h
nds32_disassembler.c
nds32_disassembler.h
nds32_edm.h	This is the interface to the Embedded Debug Module for Andes cores
nds32_insn.h
nds32_reg.c
nds32_reg.h
nds32_tlb.c
nds32_tlb.h
nds32_v2.c
nds32_v2.h
nds32_v3.c
nds32_v3.h
nds32_v3_common.c
nds32_v3_common.h
nds32_v3m.c
nds32_v3m.h
niietcm4.c
non_cfi.c
non_cfi.h
nonce.c
npcx.c
nrf5.c
nuc910.c
nuc910.h
nulink_usb.c
numicro.c
nuttx.c
nuttx_header.h
ocl.c
ocl.h
opcodes.h
opendous.c
openjtag.c
openocd.c
openocd.h
options.c
or1k.c
or1k.h
or1k_du.h
or1k_du_adv.c
or1k_tap.h
or1k_tap_mohor.c
or1k_tap_vjtag.c
or1k_tap_xilinx_bscan.c
orion.c
osbdm.c
parport.c
pic32mx.c
pld.c
pld.h
presto.c	Holds driver for PRESTO programmer from ASIX
program.c
program.h
protocol.c	Implementation of the OpenULINK communication protocol
protocol.h
psoc4.c
psoc5lp.c
psoc6.c
quark_d20xx.c
quark_x10xx.c
reg_ezusb.h	All information in this file was taken from the EZ-USB Technical Reference Manual, Cypress Semiconductor, 3901 North First Street San Jose, CA 95134 (www.cypress.com)
register.c	Holds utilities to work with register caches
register.h
remote_bitbang.c
renesas_rpchf.c
replacements.c
replacements.h
riot.c
riscv-011.c
riscv-013.c
riscv.c
riscv.h
riscv_semihosting.c	Hold RISC-V semihosting support
rlink.c
rlink.h
rlink_dtc_cmd.h
rlink_ep1_cmd.h
rlink_speed_table.c
rlink_st7.h
rp2040.c
rshim.c
rsl10.c
rtos.c
rtos.h
rtos_chibios_stackings.c
rtos_chibios_stackings.h
rtos_ecos_stackings.c
rtos_ecos_stackings.h
rtos_embkernel_stackings.c
rtos_embkernel_stackings.h
rtos_mqx_stackings.c
rtos_mqx_stackings.h
rtos_riot_stackings.c
rtos_riot_stackings.h
rtos_standard_stackings.c
rtos_standard_stackings.h
rtos_ucos_iii_stackings.c
rtos_ucos_iii_stackings.h
rtt/rtt.c
target/rtt.c
rtt/rtt.h
target/rtt.h
rtt_server.c	RTT server
rtt_server.h
s3c2410.c
s3c2412.c
s3c2440.c
s3c2443.c
s3c24xx.c
s3c24xx.h
s3c24xx_regs.h
s3c6400.c
semihosting_common.c	Common ARM semihosting support
semihosting_common.h
server.c
server.h
sfdp.c
sfdp.h
sh_qspi.c
sim3x.c
smp.c
smp.h
spi.c
spi.h
stellaris.c
stlink_usb.c
stm32f1x.c
stm32f2x.c
stm32h7x.c
stm32l4x.c
stm32l4x.h
stm32lx.c
stm8.c
stm8.h
stmqspi.c
stmqspi.h
stmsmi.c
str7x.c
str9x.c
str9xpec.c
svf.c
svf.h
swd.h
swim.c
swim.h	This file implements support for STMicroelectronics debug protocol SWIM (Single Wire Interface Module)
swm050.c
sysfsgpio.c	This driver implements a bitbang jtag interface using gpio lines via sysfs
system.h
target.c
target.h
target_request.c
target_request.h
target_type.h
flash/nand/tcl.c
flash/nor/tcl.c	Implements Tcl commands used to access NOR flash facilities
jtag/tcl.c	Holds support for accessing JTAG-specific mechanisms from TCl scripts
rtt/tcl.c
tcl.h
tcl_server.c
tcl_server.h
telnet_server.c
telnet_server.h
testee.c
ThreadX.c
ti_icdi_usb.c
time_support.c
time_support.h
time_support_common.c
tms470.c
TODO	This file contains the The List page
trace.c
trace.h
transport.c	Infrastructure for specifying and managing the transport protocol used in a given debug or programming session
transport.h
types.h
ublast2_access_libusb.c
ublast_access.h
ublast_access_ftdi.c
uCOS-III.c
ulink.c
usb.c	Defines USB descriptors, interrupt routines and helper functions
usb.h
usb_blaster.c
usbprog.c
usbtogpio.c
usbtojtagraw.c
usbtopwr.c
usbtoswd.c
usbtoxxx.c
usbtoxxx.h
usbtoxxx_internal.h
util.c
util.h
vdebug.c	Virtual debug interface provides a connection between a sw debugger and the simulated, emulated core. The openOCD client connects via TCP sockets with vdebug server and over DPI-based transactor with the emulation or simulation The vdebug debug driver supports JTAG and DAP-level transports
versaloon.c
versaloon.h
versaloon_include.h
versaloon_internal.h
virtex2.c
virtex2.h
virtual.c
vsllink.c
w600.c
x86_32_common.c
x86_32_common.h
xcf.c
xds110.c
xilinx_bit.c
xilinx_bit.h
xlnx-pcie-xvc.c
xmc1xxx.c
xmc4xxx.c
xscale.c
xscale.h
xsvf.c
xsvf.h
xtensa.c
xtensa.h	Holds the interface to Xtensa cores
xtensa_chip.c
xtensa_chip.h
xtensa_debug_module.c
xtensa_debug_module.h
xtensa_regs.h
zephyr.c