diff --git a/Makefile.am b/Makefile.am
index acb944a4..39fcd440 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -156,6 +156,20 @@ libmetal_a_SOURCES = \
 	src/vector.S \
 	src/watchdog.c
 
+########################################################
+# libmetal-pico
+########################################################
+
+lib_LIBRARIES += libmetal-pico.a
+
+libmetal_pico_a_SOURCES = \
+	gloss/crt0.S \
+	pico/iob.c \
+	gloss/sys_exit.c \
+	pico/times.c \
+	gloss/sys_sbrk.c \
+	pico/sysconf.c
+
 ########################################################
 # libgloss
 ########################################################
diff --git a/Makefile.in b/Makefile.in
index 4e38c146..7c0d628a 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -243,6 +243,13 @@ am_libmetal_a_OBJECTS = src/drivers/fixed-clock.$(OBJEXT) \
 	src/time.$(OBJEXT) src/trap.$(OBJEXT) src/tty.$(OBJEXT) \
 	src/uart.$(OBJEXT) src/vector.$(OBJEXT) src/watchdog.$(OBJEXT)
 libmetal_a_OBJECTS = $(am_libmetal_a_OBJECTS)
+libmetal_pico_a_AR = $(AR) $(ARFLAGS)
+libmetal_pico_a_LIBADD =
+am_libmetal_pico_a_OBJECTS = gloss/crt0.$(OBJEXT) \
+	pico/iob.$(OBJEXT) gloss/sys_exit.$(OBJEXT) pico/times.$(OBJEXT) \
+	gloss/sys_sbrk.$(OBJEXT) pico/sysconf.$(OBJEXT)
+libmetal_pico_a_OBJECTS =  \
+	$(am_libmetal_pico_a_OBJECTS)
 AM_V_P = $(am__v_P_@AM_V@)
 am__v_P_ = $(am__v_P_@AM_DEFAULT_V@)
 am__v_P_0 = false
@@ -277,9 +284,10 @@ AM_V_CCLD = $(am__v_CCLD_@AM_V@)
 am__v_CCLD_ = $(am__v_CCLD_@AM_DEFAULT_V@)
 am__v_CCLD_0 = @echo "  CCLD    " $@;
 am__v_CCLD_1 = 
-SOURCES = $(libmetal_gloss_a_SOURCES) $(libmetal_a_SOURCES)
+SOURCES = $(libmetal_gloss_a_SOURCES) $(libmetal_a_SOURCES) \
+	$(libmetal_pico_a_SOURCES)
 DIST_SOURCES = $(am__libmetal_gloss_a_SOURCES_DIST) \
-	$(libmetal_a_SOURCES)
+	$(libmetal_a_SOURCES) $(libmetal_pico_a_SOURCES)
 am__can_run_installinfo = \
   case $$AM_UPDATE_INFO_DIR in \
     n|no|NO) false;; \
@@ -473,7 +481,11 @@ BUILT_SOURCES = \
 ########################################################
 # libmetal
 ########################################################
-lib_LIBRARIES = libmetal.a $(am__append_1)
+
+########################################################
+# libmetal-pico
+########################################################
+lib_LIBRARIES = libmetal.a libmetal-pico.a $(am__append_1)
 libmetal_a_SOURCES = \
 	src/drivers/fixed-clock.c \
 	src/drivers/fixed-factor-clock.c \
@@ -534,6 +546,14 @@ libmetal_a_SOURCES = \
 	src/vector.S \
 	src/watchdog.c
 
+libmetal_pico_a_SOURCES = \
+	gloss/crt0.S \
+	pico/iob.c \
+	gloss/sys_exit.c \
+	pico/times.c \
+	gloss/sys_sbrk.c \
+	pico/sysconf.c
+
 @WITH_BUILTIN_LIBGLOSS_TRUE@libmetal_gloss_a_SOURCES = \
 @WITH_BUILTIN_LIBGLOSS_TRUE@	gloss/crt0.S \
 @WITH_BUILTIN_LIBGLOSS_TRUE@	gloss/nanosleep.c \
@@ -838,10 +858,34 @@ libmetal.a: $(libmetal_a_OBJECTS) $(libmetal_a_DEPENDENCIES) $(EXTRA_libmetal_a_
 	$(AM_V_at)-rm -f libmetal.a
 	$(AM_V_AR)$(libmetal_a_AR) libmetal.a $(libmetal_a_OBJECTS) $(libmetal_a_LIBADD)
 	$(AM_V_at)$(RANLIB) libmetal.a
+pico/$(am__dirstamp):
+	@$(MKDIR_P) pico
+	@: > pico/$(am__dirstamp)
+pico/$(DEPDIR)/$(am__dirstamp):
+	@$(MKDIR_P) pico/$(DEPDIR)
+	@: > pico/$(DEPDIR)/$(am__dirstamp)
+gloss/crt0.$(OBJEXT): gloss/$(am__dirstamp) \
+	gloss/$(DEPDIR)/$(am__dirstamp)
+pico/iob.$(OBJEXT): pico/$(am__dirstamp) \
+	pico/$(DEPDIR)/$(am__dirstamp)
+gloss/sys_exit.$(OBJEXT): gloss/$(am__dirstamp) \
+	gloss/$(DEPDIR)/$(am__dirstamp)
+pico/times.$(OBJEXT): pico/$(am__dirstamp) \
+	pico/$(DEPDIR)/$(am__dirstamp)
+gloss/sys_sbrk.$(OBJEXT): gloss/$(am__dirstamp) \
+	gloss/$(DEPDIR)/$(am__dirstamp)
+pico/sysconf.$(OBJEXT): pico/$(am__dirstamp) \
+	pico/$(DEPDIR)/$(am__dirstamp)
+
+libmetal-pico.a: $(libmetal_pico_a_OBJECTS) $(libmetal_pico_a_DEPENDENCIES) $(EXTRA_libmetal_pico_a_DEPENDENCIES) 
+	$(AM_V_at)-rm -f libmetal-pico.a
+	$(AM_V_AR)$(libmetal_pico_a_AR) libmetal-pico.a $(libmetal_pico_a_OBJECTS) $(libmetal_pico_a_LIBADD)
+	$(AM_V_at)$(RANLIB) libmetal-pico.a
 
 mostlyclean-compile:
 	-rm -f *.$(OBJEXT)
 	-rm -f gloss/*.$(OBJEXT)
+	-rm -f pico/*.$(OBJEXT)
 	-rm -f src/*.$(OBJEXT)
 	-rm -f src/drivers/*.$(OBJEXT)
 
@@ -881,6 +925,12 @@ distclean-compile:
 @AMDEP_TRUE@@am__include@ @am__quote@gloss/$(DEPDIR)/sys_utime.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@gloss/$(DEPDIR)/sys_wait.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@gloss/$(DEPDIR)/sys_write.Po@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@pico/$(DEPDIR)/crt0.Po@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@pico/$(DEPDIR)/exit.Po@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@pico/$(DEPDIR)/iob.Po@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@pico/$(DEPDIR)/sbrk.Po@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@pico/$(DEPDIR)/sysconf.Po@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@pico/$(DEPDIR)/times.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@src/$(DEPDIR)/atomic.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@src/$(DEPDIR)/button.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@src/$(DEPDIR)/cache.Po@am__quote@
@@ -1254,6 +1304,8 @@ distclean-generic:
 	-test . = "$(srcdir)" || test -z "$(CONFIG_CLEAN_VPATH_FILES)" || rm -f $(CONFIG_CLEAN_VPATH_FILES)
 	-rm -f gloss/$(DEPDIR)/$(am__dirstamp)
 	-rm -f gloss/$(am__dirstamp)
+	-rm -f pico/$(DEPDIR)/$(am__dirstamp)
+	-rm -f pico/$(am__dirstamp)
 	-rm -f src/$(DEPDIR)/$(am__dirstamp)
 	-rm -f src/$(am__dirstamp)
 	-rm -f src/drivers/$(DEPDIR)/$(am__dirstamp)
@@ -1269,7 +1321,7 @@ clean-am: clean-generic clean-libLIBRARIES clean-local mostlyclean-am
 
 distclean: distclean-am
 	-rm -f $(am__CONFIG_DISTCLEAN_FILES)
-	-rm -rf gloss/$(DEPDIR) src/$(DEPDIR) src/drivers/$(DEPDIR)
+	-rm -rf gloss/$(DEPDIR) pico/$(DEPDIR) src/$(DEPDIR) src/drivers/$(DEPDIR)
 	-rm -f Makefile
 distclean-am: clean-am distclean-compile distclean-generic \
 	distclean-tags
@@ -1317,7 +1369,7 @@ installcheck-am:
 maintainer-clean: maintainer-clean-am
 	-rm -f $(am__CONFIG_DISTCLEAN_FILES)
 	-rm -rf $(top_srcdir)/autom4te.cache
-	-rm -rf gloss/$(DEPDIR) src/$(DEPDIR) src/drivers/$(DEPDIR)
+	-rm -rf gloss/$(DEPDIR) pico/$(DEPDIR) src/$(DEPDIR) src/drivers/$(DEPDIR)
 	-rm -f Makefile
 maintainer-clean-am: distclean-am maintainer-clean-generic
 
diff --git a/gloss/crt0.S b/gloss/crt0.S
index e68b736a..4d81e253 100644
--- a/gloss/crt0.S
+++ b/gloss/crt0.S
@@ -126,6 +126,10 @@ _start:
 #endif
 2:
 
+  /* Set TLS pointer */
+  .weak __tls_base	
+  la tp, __tls_base
+
   /* At this point we're in an environment that can execute C code.  The first
    * thing to do is to make the callback to the parent environment if it's been
    * requested to do so. */
diff --git a/gloss/sys_getcwd.c b/gloss/sys_getcwd.c
index e80ff4ad..d8e73de6 100644
--- a/gloss/sys_getcwd.c
+++ b/gloss/sys_getcwd.c
@@ -1,4 +1,5 @@
 #include <errno.h>
+#include <stddef.h>
 
 char *_getcwd(char *buf, size_t size) {
     errno = -ENOSYS;
diff --git a/gloss/sys_sbrk.c b/gloss/sys_sbrk.c
index 5deb1371..a1b14b21 100644
--- a/gloss/sys_sbrk.c
+++ b/gloss/sys_sbrk.c
@@ -8,15 +8,20 @@
  * that's been allocated. */
 extern char metal_segment_heap_target_start;
 extern char metal_segment_heap_target_end;
-static char *brk = &metal_segment_heap_target_start;
+static char *__brk = &metal_segment_heap_target_start;
+
+#ifdef _PICOLIBC__
+#define _brk brk
+#define _sbrk sbrk
+#endif
 
 int _brk(void *addr) {
-    brk = addr;
+    __brk = addr;
     return 0;
 }
 
 char *_sbrk(ptrdiff_t incr) {
-    char *old = brk;
+    char *old = __brk;
 
     /* If __heap_size == 0, we can't allocate memory on the heap */
     if (&metal_segment_heap_target_start == &metal_segment_heap_target_end) {
@@ -24,10 +29,10 @@ char *_sbrk(ptrdiff_t incr) {
     }
 
     /* Don't move the break past the end of the heap */
-    if ((brk + incr) < &metal_segment_heap_target_end) {
-        brk += incr;
+    if ((__brk + incr) < &metal_segment_heap_target_end) {
+        __brk += incr;
     } else {
-        brk = &metal_segment_heap_target_end;
+        __brk = &metal_segment_heap_target_end;
         return (void *)-1;
     }
 
diff --git a/pico/iob.c b/pico/iob.c
new file mode 100644
index 00000000..481c014f
--- /dev/null
+++ b/pico/iob.c
@@ -0,0 +1,44 @@
+/*
+ * Copyright © 2019 Keith Packard
+ *
+ * Permission to use, copy, modify, distribute, and sell this software and its
+ * documentation for any purpose is hereby granted without fee, provided that
+ * the above copyright notice appear in all copies and that both that copyright
+ * notice and this permission notice appear in supporting documentation, and
+ * that the name of the copyright holders not be used in advertising or
+ * publicity pertaining to distribution of the software without specific,
+ * written prior permission.  The copyright holders make no representations
+ * about the suitability of this software for any purpose.  It is provided "as
+ * is" without express or implied warranty.
+ *
+ * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
+ * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
+ * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
+ * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
+ * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
+ * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
+ * OF THIS SOFTWARE.
+ */
+
+#include <metal/tty.h>
+#include <stdio.h>
+
+static int metal_putc(char c, FILE *file) {
+    (void)file;
+    metal_tty_putc(c);
+    return c;
+}
+
+static int metal_getc(FILE *file) {
+    int c;
+    (void)file;
+    metal_tty_getc(&c);
+    return c;
+}
+
+static int metal_flush(FILE *file) { return 0; }
+
+static FILE __stdio =
+    FDEV_SETUP_STREAM(metal_putc, metal_getc, metal_flush, _FDEV_SETUP_RW);
+
+FILE *const __iob[3] = {&__stdio, &__stdio, &__stdio};
diff --git a/pico/sysconf.c b/pico/sysconf.c
new file mode 100644
index 00000000..63f4ce90
--- /dev/null
+++ b/pico/sysconf.c
@@ -0,0 +1,16 @@
+#include <time.h>
+#include <unistd.h>
+
+/* Get configurable system variables.  */
+
+long sysconf(int name) {
+    unsigned long long timebase;
+
+    switch (name) {
+    case _SC_CLK_TCK:
+        metal_timer_get_timebase_frequency(0, &timebase);
+        return (long)timebase;
+    }
+
+    return -1;
+}
diff --git a/pico/times.c b/pico/times.c
new file mode 100644
index 00000000..a6a19192
--- /dev/null
+++ b/pico/times.c
@@ -0,0 +1,17 @@
+#include <metal/timer.h>
+#include <sys/time.h>
+#include <sys/times.h>
+
+/*
+ * Simple enough to return the tick count by
+ * just getting it from the hardware.
+ */
+
+clock_t times(struct tms *buf) {
+    unsigned long long mcc;
+    metal_timer_get_cyclecount(0, &mcc);
+    buf->tms_stime = 0;
+    buf->tms_cutime = 0;
+    buf->tms_cstime = 0;
+    return buf->tms_utime = mcc;
+}