RISC-V Freertos support (#582)

Support reading names/status of all threads, as well as all registers that are stored on the stack.

Limited to RV32, no FPU.

---

* WIP

Change-Id: I09417c2e45748504be449d74c39ae0b6b311e277

* WIP

Change-Id: I975fa2cabbf43ccf64f5162337c394f9c8e3017f

* Import rbtreehash-list from gnulib.

The main change to get this to build was to remove 3 includes from
config.h (actual code change in configure.ac) because lib/Makefile.am
doesn't contain the correct flags to find the files referenced there.
Instead I sprinkled necessary includes throughout the source code.

This feels like less of a hack regardless, so hopefully that's OK.

I'm not actually using the new library. Just got it to build.

Change-Id: I824000d8be0b6f58b6f2036498b37c33f453515a

* Actually use linkedhash_map.

Moved some files around to get it to link. Also note I'm using a
different module than before. This is the one I want (I think right
now).

Change-Id: I6161bffd4b5f916602c33c1930be6e061cefe982

* Properly track TCB/threadid mappings.

Change-Id: I725abb96f880745d78c5634d5faff7385c2773e1

* OpenOCD no longer crashes reading rv32 freertos regs

Change-Id: Ia84502dbf007145995d4fba8661153ab7f58f26f

* WIP

The register values reported for threads that aren't the current thread
look believable to me.

Change-Id: I94b109565c8cc2029fa77657a7fc10291bcb36e3

* Correctly mark the current thread.

Change-Id: Id94ababb55a222292090e6465e47ebf92ca26291

* Try to make the build pass.

Change-Id: I0fddd10fe22c013464f9a1e106cd21470fa7afe1
Signed-off-by: Tim Newsome <tim@sifive.com>

* Exclude new gnulib files.

Change-Id: I8b95615908034124f2236422771b5079f3304e37
Signed-off-by: Tim Newsome <tim@sifive.com>

* Style fixes.

Change-Id: I4aef0b1d0b0e366893c740ab89756fe8ea033ddb
Signed-off-by: Tim Newsome <tim@sifive.com>

* Don't include string.h.

It breaks the i686-w64-mingw32-gcc build, which complains:
error: incompatible implicit declaration of built-in function ‘strndup’

Change-Id: I8d758fe092efa503e015f71f34721f2c44632516
Signed-off-by: Tim Newsome <tim@sifive.com>

* Hopefully fix mingw32 build.

Change-Id: I8703b834b5679588b3aa6602ae4add7258dbd879
Signed-off-by: Tim Newsome <tim@sifive.com>

* Include winsock2 in replacements.

Change-Id: I77cfc90736c771a3cdefb39062e6c5b59de52cd5
Signed-off-by: Tim Newsome <tim@sifive.com>

* Zero now gets the correct value.

Change-Id: Ia7da043439a82081629b8a5991ed8cbc382d5ac8
Signed-off-by: Tim Newsome <tim@sifive.com>

* Accommodate non-general regs on the stack.

Also refactor FreeRTOS a little to separate out target-specific code
from target-indepent code.

Change-Id: Icc74d85b24f35d069be091e32e23144573560e9f

* All registers now read sane values.

It appears that FreeRTOS wastes a space on the stack, where x0 would be
saved. Am I missing something?

Correctly read mstatus as it is saved on the stack as well. This same
mechanism should also work for FPU registers, although there's more work
to be done before we get there.

Change-Id: Iabacc3af2ab368aa7b9090c1ff719451a087b5ed
Signed-off-by: Tim Newsome <tim@sifive.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/.travis.yml b/.travis.yml
index bbf2319..d0bc8f2 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -69,7 +69,8 @@ script:
     # so this should work fine most of the time, and be a lot better than not
     # checking at all.
     - git diff -U20 HEAD~40 |
-        filterdiff -x "a/src/jtag/drivers/libjaylink/*" -x "a/tools/git2cl/*" |
+        filterdiff -x "a/src/jtag/drivers/libjaylink/*" -x "a/tools/git2cl/*"
+                -x "b/src/gnulib/*" |
         ./tools/scripts/checkpatch.pl --no-signoff -
     - ./bootstrap && ./configure --enable-remote-bitbang --enable-jtag_vpi $CONFIGURE_ARGS && make
     - file src/$EXECUTABLE