boards: lm3s6965-ek: added config to run NuttX with enabled NXFLAT binary loader mode on QEMU;

Conditionally turn off -mpic-data-is-text-relative flag to access bss via the GOT
(https://cwiki.apache.org/confluence/pages/viewpage.action?pageId=139630111).

This is related to issue #3737.

boards/arm/tiva/lm3s6965-ek/configs/qemu-nxflat/defconfig

@@ -0,0 +1,75 @@
+#
+# This file is autogenerated: PLEASE DO NOT EDIT IT.
+#
+# You can use "make menuconfig" to make any modifications to the installed .config file.
+# You can then do "make savedefconfig" to generate a new defconfig file that includes your
+# modifications.
+#
+# CONFIG_FS_PROCFS_EXCLUDE_ENVIRON is not set
+# CONFIG_NSH_DISABLE_DATE is not set
+CONFIG_ARCH="arm"
+CONFIG_ARCH_BOARD="lm3s6965-ek"
+CONFIG_ARCH_BOARD_LM3S6965EK=y
+CONFIG_ARCH_CHIP="tiva"
+CONFIG_ARCH_CHIP_LM3S6965=y
+CONFIG_ARCH_CHIP_LM3S=y
+CONFIG_ARCH_CHIP_LM=y
+CONFIG_ARCH_STACKDUMP=y
+CONFIG_ARMV7M_TOOLCHAIN_BUILDROOT=y
+CONFIG_BOARDCTL_ROMDISK=y
+CONFIG_BOARD_LOOPSPERMSEC=4531
+CONFIG_CLOCK_MONOTONIC=y
+CONFIG_EXAMPLES_NXFLAT=y
+CONFIG_FS_ROMFS=y
+CONFIG_LIBM=y
+CONFIG_LIB_BOARDCTL=y
+CONFIG_MAX_TASKS=16
+CONFIG_NET=y
+CONFIG_NETDB_DNSCLIENT=y
+CONFIG_NETDB_DNSCLIENT_NAMESIZE=64
+CONFIG_NETDB_DNSSERVER_NOADDR=y
+CONFIG_NETDB_MAX_IPADDR=2
+CONFIG_NETINIT_DHCPC=y
+CONFIG_NETINIT_NOMAC=y
+CONFIG_NETUTILS_NETCAT=y
+CONFIG_NETUTILS_TELNETD=y
+CONFIG_NETUTILS_TFTPC=y
+CONFIG_NET_BROADCAST=y
+CONFIG_NET_ICMP=y
+CONFIG_NET_ICMP_SOCKET=y
+CONFIG_NET_MAX_LISTENPORTS=8
+CONFIG_NET_SOCKOPTS=y
+CONFIG_NET_STATISTICS=y
+CONFIG_NET_TCP=y
+CONFIG_NET_UDP=y
+CONFIG_NET_UDP_CHECKSUMS=y
+CONFIG_NXFLAT=y
+CONFIG_PREALLOC_TIMERS=4
+CONFIG_RAM_SIZE=65536
+CONFIG_RAM_START=0x20000000
+CONFIG_RAW_BINARY=y
+CONFIG_RR_INTERVAL=200
+CONFIG_SCHED_HPWORK=y
+CONFIG_SCHED_WAITPID=y
+CONFIG_SDCLONE_DISABLE=y
+CONFIG_SIG_DEFAULT=y
+CONFIG_SIG_PIPE=11
+CONFIG_SPI=y
+CONFIG_START_DAY=8
+CONFIG_START_MONTH=5
+CONFIG_START_YEAR=2010
+CONFIG_SYMTAB_ORDEREDBYNAME=y
+CONFIG_TASK_NAME_SIZE=0
+CONFIG_TIVA_ETHERNET=y
+CONFIG_TIVA_GPIOA_IRQS=y
+CONFIG_TIVA_GPIOB_IRQS=y
+CONFIG_TIVA_GPIOC_IRQS=y
+CONFIG_TIVA_GPIOD_IRQS=y
+CONFIG_TIVA_GPIOE_IRQS=y
+CONFIG_TIVA_GPIOF_IRQS=y
+CONFIG_TIVA_GPIOG_IRQS=y
+CONFIG_TIVA_SSI0=y
+CONFIG_TIVA_UART0=y
+CONFIG_TIVA_WITH_QEMU=y
+CONFIG_UART0_SERIAL_CONSOLE=y
+CONFIG_USER_ENTRYPOINT="nxflat_main"

boards/arm/tiva/lm3s6965-ek/scripts/Make.defs

@@ -41,6 +41,17 @@ ARCHCXXFLAGS = -fno-builtin -fno-exceptions -fcheck-new
 ARCHWARNINGS = -Wall -Wstrict-prototypes -Wshadow -Wundef
 ARCHWARNINGSXX = -Wall -Wshadow -Wundef
 ARCHPICFLAGS = -fpic -msingle-pic-base -mpic-register=r10
+ifeq ($(CONFIG_NXFLAT),y)
+  # mpic-data-is-text-relative flag first time appeared in GCC source code tree on 2016-Jul-12
+  # and it was included in GCC 4.9.4 release on 2016-Aug-03.
+  ARCHCC_HAS_PIC_DATA_IS_TEXT_RELATIVE_FLAG = ${shell $(CC) --target-help 2>&1 | grep -c "mpic-data-is-text-relative"}
+
+  # Turn off -mpic-data-is-text-relative flag to access bss via the GOT
+  # (https://cwiki.apache.org/confluence/pages/viewpage.action?pageId=139630111)
+  ifneq ($(ARCHCC_HAS_PIC_DATA_IS_TEXT_RELATIVE_FLAG),0)
+    ARCHPICFLAGS += -mno-pic-data-is-text-relative
+  endif
+endif
 
 CFLAGS := $(ARCHCFLAGS) $(ARCHWARNINGS) $(ARCHOPTIMIZATION) $(ARCHCPUFLAGS) $(ARCHINCLUDES) $(ARCHDEFINES) $(EXTRAFLAGS) -pipe
 CPICFLAGS = $(ARCHPICFLAGS) $(CFLAGS)

tools/ci/testlist/all.dat

@@ -5,6 +5,7 @@
 -imxrt1060-evk:libcxxtest
 -launchxl-cc1310:nsh
 -launchxl-tms57004:nsh
+-lm3s6965-ek:qemu-nxflat
 -lpcxpresso-lpc1768:thttpd
 -moxa:nsh
 -olimex-lpc1766stk:slip-httpd

tools/ci/testlist/arm-13.dat

@@ -7,4 +7,5 @@
 -eagle100:thttpd
 -launchxl-cc1310:nsh
 -launchxl-tms57004:nsh
+-lm3s6965-ek:qemu-nxflat
 -tms570ls31x-usb-kit:nsh