Merge tag 'v1.9.1'2.0.0-alpha.0

Fixes for stmhal USB mass storage, lwIP bindings and VFS regressions

This release provides an important fix for the USB mass storage device in
the stmhal port by implementing the SCSI SYNCHRONIZE_CACHE command, which
is now require by some Operating Systems.  There are also fixes for the
lwIP bindings to improve non-blocking sockets and error codes.  The VFS has
some regressions fixed including the ability to statvfs the root.

All changes are listed below.

py core:
- modbuiltins: add core-provided version of input() function
- objstr: catch case of negative "maxsplit" arg to str.rsplit()
- persistentcode: allow to compile with complex numbers disabled
- objstr: allow to compile with obj-repr D, and unicode disabled
- modsys: allow to compile with obj-repr D and PY_ATTRTUPLE disabled
- provide mp_decode_uint_skip() to help reduce stack usage
- makeqstrdefs.py: make script run correctly with Python 2.6
- objstringio: if created from immutable object, follow copy on write policy

extmod:
- modlwip: connect: for non-blocking mode, return EINPROGRESS
- modlwip: fix error codes for duplicate calls to connect()
- modlwip: accept: fix error code for non-blocking mode
- vfs: allow to statvfs the root directory
- vfs: allow "buffering" and "encoding" args to VFS's open()
- modframebuf: fix signed/unsigned comparison pendantic warning

lib:
- libm: use isfinite instead of finitef, for C99 compatibility
- utils/interrupt_char: remove support for KBD_EXCEPTION disabled

tests:
- basics/string_rsplit: add tests for negative "maxsplit" argument
- float: convert "sys.exit()" to "raise SystemExit"
- float/builtin_float_minmax: PEP8 fixes
- basics: convert "sys.exit()" to "raise SystemExit"
- convert remaining "sys.exit()" to "raise SystemExit"

unix port:
- convert to use core-provided version of built-in import()
- Makefile: replace references to make with $(MAKE)

windows port:
- convert to use core-provided version of built-in import()

qemu-arm port:
- Makefile: adjust object-file lists to get correct dependencies
- enable micropython.mem_*() functions to allow more tests

stmhal port:
- boards: enable DAC for NUCLEO_F767ZI board
- add support for NUCLEO_F446RE board
- pass USB handler as parameter to allow more than one USB handler
- usb: use local USB handler variable in Start-of-Frame handler
- usb: make state for USB device private to top-level USB driver
- usbdev: for MSC implement SCSI SYNCHRONIZE_CACHE command
- convert from using stmhal's input() to core provided version

cc3200 port:
- convert from using stmhal's input() to core provided version

teensy port:
- convert from using stmhal's input() to core provided version

esp8266 port:
- Makefile: replace references to make with $(MAKE)
- Makefile: add clean-modules target
- convert from using stmhal's input() to core provided version

zephyr port:
- modusocket: getaddrinfo: Fix mp_obj_len() usage
- define MICROPY_PY_SYS_PLATFORM (to "zephyr")
- machine_pin: use native Zephyr types for Zephyr API calls

docs:
- machine.Pin: remove out_value() method
- machine.Pin: add on() and off() methods
- esp8266: consistently replace Pin.high/low methods with .on/off
- esp8266/quickref: polish Pin.on()/off() examples
- network: move confusingly-named cc3200 Server class to its reference
- uos: deconditionalize, remove minor port-specific details
- uos: move cc3200 port legacy VFS mounting functions to its ref doc
- machine: sort machine classes in logical order, not alphabetically
- network: first step to describe standard network class interface

examples:
- embedding: use core-provided KeyboardInterrupt object

1 files changed, 49 insertions, 15 deletions

diff --git a/stmhal/pendsv.c b/stmhal/pendsv.c
index ff4480eed..200d13a5a 100644
--- a/stmhal/pendsv.c
+++ b/stmhal/pendsv.c
@@ -29,6 +29,7 @@
 
 #include "py/mpstate.h"
 #include "py/runtime.h"
+#include "lib/utils/interrupt_char.h"
 #include "pendsv.h"
 #include "irq.h"
 
@@ -52,12 +53,12 @@ void pendsv_init(void) {
 // PENDSV feature.  This will wait until all interrupts are finished then raise
 // the given exception object using nlr_jump in the context of the top-level
 // thread.
-void pendsv_nlr_jump(void *o) {
+void pendsv_kbd_intr(void) {
     if (MP_STATE_VM(mp_pending_exception) == MP_OBJ_NULL) {
-        MP_STATE_VM(mp_pending_exception) = o;
+        mp_keyboard_interrupt();
     } else {
         MP_STATE_VM(mp_pending_exception) = MP_OBJ_NULL;
-        pendsv_object = o;
+        pendsv_object = &MP_STATE_VM(mp_kbd_exception);
         SCB->ICSR = SCB_ICSR_PENDSVSET_Msk;
     }
 }
@@ -70,25 +71,57 @@ void pendsv_isr_handler(void) {
     // on entry to this (naked) function, stack has the following layout:
     //
     // stack layout with DEBUG disabled:
-    //   sp[6]: pc
-    //   sp[5]: ?
-    //   sp[4]: ?
-    //   sp[3]: ?
-    //   sp[2]: ?
-    //   sp[1]: ?
+    //   sp[6]: pc=r15
+    //   sp[5]: lr=r14
+    //   sp[4]: r12
+    //   sp[3]: r3
+    //   sp[2]: r2
+    //   sp[1]: r1
     //   sp[0]: r0
     //
     // stack layout with DEBUG enabled:
-    //   sp[8]: pc
-    //   sp[7]: lr
-    //   sp[6]: ?
-    //   sp[5]: ?
-    //   sp[4]: ?
-    //   sp[3]: ?
+    //   sp[8]: pc=r15
+    //   sp[7]: lr=r14
+    //   sp[6]: r12
+    //   sp[5]: r3
+    //   sp[4]: r2
+    //   sp[3]: r1
     //   sp[2]: r0
     //   sp[1]: 0xfffffff9
     //   sp[0]: ?
 
+#if MICROPY_PY_THREAD
+    __asm volatile (
+        "ldr r1, pendsv_object_ptr\n"
+        "ldr r0, [r1]\n"
+        "cmp r0, 0\n"
+        "beq .no_obj\n"
+        "str r0, [sp, #0]\n"            // store to r0 on stack
+        "mov r0, #0\n"
+        "str r0, [r1]\n"                // clear pendsv_object
+        "ldr r0, nlr_jump_ptr\n"
+        "str r0, [sp, #24]\n"           // store to pc on stack
+        "bx lr\n"                       // return from interrupt; will return to nlr_jump
+
+        ".no_obj:\n"                    // pendsv_object==NULL
+        "push {r4-r11, lr}\n"
+        "vpush {s16-s31}\n"
+        "mrs r5, primask\n"             // save PRIMASK in r5
+        "cpsid i\n"                     // disable interrupts while we change stacks
+        "mov r0, sp\n"                  // pass sp to save
+        "mov r4, lr\n"                  // save lr because we are making a call
+        "bl pyb_thread_next\n"          // get next thread to execute
+        "mov lr, r4\n"                  // restore lr
+        "mov sp, r0\n"                  // switch stacks
+        "msr primask, r5\n"             // reenable interrupts
+        "vpop {s16-s31}\n"
+        "pop {r4-r11, lr}\n"
+        "bx lr\n"                       // return from interrupt; will return to new thread
+        ".align 2\n"
+        "pendsv_object_ptr: .word pendsv_object\n"
+        "nlr_jump_ptr: .word nlr_jump\n"
+    );
+#else
     __asm volatile (
         "ldr r0, pendsv_object_ptr\n"
         "ldr r0, [r0]\n"
@@ -108,6 +141,7 @@ void pendsv_isr_handler(void) {
         "pendsv_object_ptr: .word pendsv_object\n"
         "nlr_jump_ptr: .word nlr_jump\n"
     );
+#endif
 
     /*
     uint32_t x[2] = {0x424242, 0xdeaddead};