Merge tag 'xtensa-20191201' of git://github.com/jcmvbkbc/linux-xtensa

Pull Xtensa updates from Max Filippov:

 - add support for execute in place (XIP) kernels

 - improvements in inline assembly: use named arguments and "m"
   constraints where possible

 - improve stack dumping

 - clean up system_call code and syscall tracing

 - various small fixes and cleanups

* tag 'xtensa-20191201' of git://github.com/jcmvbkbc/linux-xtensa: (30 commits)
  xtensa: clean up system_call/xtensa_rt_sigreturn interaction
  xtensa: fix system_call interaction with ptrace
  xtensa: rearrange syscall tracing
  xtensa: fix syscall_set_return_value
  xtensa: drop unneeded headers from coprocessor.S
  xtensa: entry: Remove unneeded need_resched() loop
  xtensa: use MEMBLOCK_ALLOC_ANYWHERE for KASAN shadow map
  xtensa: fix TLB sanity checker
  xtensa: get rid of __ARCH_USE_5LEVEL_HACK
  xtensa: mm: fix PMD folding implementation
  xtensa: make stack dump size configurable
  xtensa: improve stack dumping
  xtensa: use "m" constraint instead of "r" in futex.h assembly
  xtensa: use "m" constraint instead of "a" in cmpxchg.h assembly
  xtensa: use named assembly arguments in cmpxchg.h
  xtensa: use "m" constraint instead of "a" in atomic.h assembly
  xtensa: use named assembly arguments in atomic.h
  xtensa: use "m" constraint instead of "a" in bitops.h assembly
  xtensa: use named assembly arguments in bitops.h
  xtensa: use macros to generate *_bit and test_and_*_bit functions
  ...

Documentation/features/core/tracehook/arch-support.txt

@@ -30,5 +30,5 @@
     |          um: | TODO |
     |   unicore32: | TODO |
     |         x86: |  ok  |
-    |      xtensa: | TODO |
+    |      xtensa: |  ok  |
     -----------------------

arch/xtensa/Kconfig.debug

@@ -31,3 +31,10 @@ config S32C1I_SELFTEST
 	  It is easy to make wrong hardware configuration, this test should catch it early.
 
 	  Say 'N' on stable hardware.
+
+config PRINT_STACK_DEPTH
+	int "Stack depth to print" if DEBUG_KERNEL
+	default 64
+	help
+	  This option allows you to set the stack depth that the kernel
+	  prints in stack traces.

arch/xtensa/Makefile

@@ -87,7 +87,7 @@ drivers-$(CONFIG_OPROFILE)	+= arch/xtensa/oprofile/
 
 boot		:= arch/xtensa/boot
 
-all Image zImage uImage: vmlinux
+all Image zImage uImage xipImage: vmlinux
 	$(Q)$(MAKE) $(build)=$(boot) $@
 
 archheaders:
@@ -97,4 +97,5 @@ define archhelp
   @echo '* Image       - Kernel ELF image with reset vector'
   @echo '* zImage      - Compressed kernel image (arch/xtensa/boot/images/zImage.*)'
   @echo '* uImage      - U-Boot wrapped image'
+  @echo '  xipImage    - XIP image'
 endef

arch/xtensa/boot/Makefile

@@ -29,6 +29,7 @@ all: $(boot-y)
 Image: boot-elf
 zImage: boot-redboot
 uImage: $(obj)/uImage
+xipImage: $(obj)/xipImage
 
 boot-elf boot-redboot: $(addprefix $(obj)/,$(subdir-y))
 	$(Q)$(MAKE) $(build)=$(obj)/$@ $(MAKECMDGOALS)
@@ -50,3 +51,7 @@ UIMAGE_COMPRESSION = gzip
 $(obj)/uImage: vmlinux.bin.gz FORCE
 	$(call if_changed,uimage)
 	$(Q)$(kecho) '  Kernel: $@ is ready'
+
+$(obj)/xipImage: vmlinux FORCE
+	$(call if_changed,objcopy)
+	$(Q)$(kecho) '  Kernel: $@ is ready'

arch/xtensa/configs/xip_kc705_defconfig

+CONFIG_SYSVIPC=y
+CONFIG_POSIX_MQUEUE=y
+CONFIG_NO_HZ_IDLE=y
+CONFIG_HIGH_RES_TIMERS=y
+CONFIG_PREEMPT=y
+CONFIG_IRQ_TIME_ACCOUNTING=y
+CONFIG_BSD_PROCESS_ACCT=y
+CONFIG_MEMCG=y
+CONFIG_CGROUP_FREEZER=y
+CONFIG_CGROUP_DEVICE=y
+CONFIG_CGROUP_CPUACCT=y
+CONFIG_CGROUP_DEBUG=y
+CONFIG_NAMESPACES=y
+CONFIG_SCHED_AUTOGROUP=y
+CONFIG_RELAY=y
+CONFIG_BLK_DEV_INITRD=y
+CONFIG_EXPERT=y
+CONFIG_KALLSYMS_ALL=y
+CONFIG_PROFILING=y
+CONFIG_XTENSA_VARIANT_DC233C=y
+CONFIG_XTENSA_UNALIGNED_USER=y
+CONFIG_XIP_KERNEL=y
+CONFIG_XIP_DATA_ADDR=0xd0000000
+CONFIG_KERNEL_VIRTUAL_ADDRESS=0xe6000000
+CONFIG_KERNEL_LOAD_ADDRESS=0xf6000000
+CONFIG_XTENSA_KSEG_512M=y
+CONFIG_HIGHMEM=y
+CONFIG_XTENSA_PLATFORM_XTFPGA=y
+CONFIG_CMDLINE_BOOL=y
+CONFIG_CMDLINE="earlycon=uart8250,mmio32native,0xfd050020,115200n8 console=ttyS0,115200n8 ip=dhcp root=/dev/nfs rw debug memmap=0x38000000@0"
+CONFIG_USE_OF=y
+CONFIG_BUILTIN_DTB_SOURCE="kc705"
+# CONFIG_PARSE_BOOTPARAM is not set
+CONFIG_OPROFILE=y
+# CONFIG_CORE_DUMP_DEFAULT_ELF_HEADERS is not set
+# CONFIG_COMPACTION is not set
+CONFIG_NET=y
+CONFIG_PACKET=y
+CONFIG_UNIX=y
+CONFIG_INET=y
+CONFIG_IP_MULTICAST=y
+CONFIG_IP_PNP=y
+CONFIG_IP_PNP_DHCP=y
+CONFIG_IP_PNP_BOOTP=y
+CONFIG_IP_PNP_RARP=y
+# CONFIG_IPV6 is not set
+CONFIG_NETFILTER=y
+# CONFIG_WIRELESS is not set
+CONFIG_UEVENT_HELPER=y
+CONFIG_DEVTMPFS=y
+CONFIG_DEVTMPFS_MOUNT=y
+# CONFIG_STANDALONE is not set
+CONFIG_BLK_DEV_LOOP=y
+CONFIG_BLK_DEV_RAM=y
+CONFIG_SCSI=y
+CONFIG_BLK_DEV_SD=y
+CONFIG_NETDEVICES=y
+# CONFIG_NET_VENDOR_ARC is not set
+# CONFIG_NET_VENDOR_AURORA is not set
+# CONFIG_NET_VENDOR_BROADCOM is not set
+# CONFIG_NET_VENDOR_INTEL is not set
+# CONFIG_NET_VENDOR_MARVELL is not set
+# CONFIG_NET_VENDOR_MICREL is not set
+# CONFIG_NET_VENDOR_NATSEMI is not set
+# CONFIG_NET_VENDOR_SAMSUNG is not set
+# CONFIG_NET_VENDOR_SEEQ is not set
+# CONFIG_NET_VENDOR_SMSC is not set
+# CONFIG_NET_VENDOR_STMICRO is not set
+# CONFIG_NET_VENDOR_VIA is not set
+# CONFIG_NET_VENDOR_WIZNET is not set
+CONFIG_MARVELL_PHY=y
+# CONFIG_WLAN is not set
+# CONFIG_INPUT_KEYBOARD is not set
+# CONFIG_INPUT_MOUSE is not set
+# CONFIG_SERIO is not set
+CONFIG_DEVKMEM=y
+CONFIG_SERIAL_8250=y
+# CONFIG_SERIAL_8250_DEPRECATED_OPTIONS is not set
+CONFIG_SERIAL_8250_CONSOLE=y
+CONFIG_SERIAL_OF_PLATFORM=y
+# CONFIG_HWMON is not set
+CONFIG_WATCHDOG=y
+CONFIG_WATCHDOG_NOWAYOUT=y
+CONFIG_SOFT_WATCHDOG=y
+# CONFIG_VGA_CONSOLE is not set
+# CONFIG_USB_SUPPORT is not set
+# CONFIG_IOMMU_SUPPORT is not set
+CONFIG_EXT3_FS=y
+CONFIG_FANOTIFY=y
+CONFIG_VFAT_FS=y
+CONFIG_PROC_KCORE=y
+CONFIG_TMPFS=y
+CONFIG_TMPFS_POSIX_ACL=y
+CONFIG_NFS_FS=y
+CONFIG_NFS_V4=y
+CONFIG_NFS_SWAP=y
+CONFIG_ROOT_NFS=y
+CONFIG_SUNRPC_DEBUG=y
+CONFIG_NLS_CODEPAGE_437=y
+CONFIG_NLS_ISO8859_1=y
+CONFIG_CRYPTO_ECHAINIV=y
+CONFIG_CRYPTO_DEFLATE=y
+CONFIG_CRYPTO_LZO=y
+CONFIG_CRYPTO_ANSI_CPRNG=y
+CONFIG_PRINTK_TIME=y
+CONFIG_DYNAMIC_DEBUG=y
+CONFIG_DEBUG_INFO=y
+CONFIG_MAGIC_SYSRQ=y
+CONFIG_DETECT_HUNG_TASK=y
+# CONFIG_SCHED_DEBUG is not set
+CONFIG_SCHEDSTATS=y
+CONFIG_DEBUG_RT_MUTEXES=y
+CONFIG_DEBUG_SPINLOCK=y
+CONFIG_DEBUG_MUTEXES=y
+CONFIG_DEBUG_ATOMIC_SLEEP=y
+CONFIG_STACKTRACE=y
+CONFIG_RCU_TRACE=y
+# CONFIG_FTRACE is not set
+# CONFIG_S32C1I_SELFTEST is not set

arch/xtensa/include/asm/Kbuild

@@ -11,6 +11,7 @@ generic-y += exec.h
 generic-y += extable.h
 generic-y += fb.h
 generic-y += hardirq.h
+generic-y += hw_irq.h
 generic-y += irq_regs.h
 generic-y += irq_work.h
 generic-y += kdebug.h
@@ -30,6 +31,7 @@ generic-y += qspinlock.h
 generic-y += sections.h
 generic-y += topology.h
 generic-y += trace_clock.h
+generic-y += user.h
 generic-y += vga.h
 generic-y += word-at-a-time.h
 generic-y += xor.h

arch/xtensa/include/asm/atomic.h

@@ -64,13 +64,13 @@ static inline void atomic_##op(int i, atomic_t *v)			\
 	int result;							\
 									\
 	__asm__ __volatile__(						\
-			"1:     l32ex   %1, %3\n"			\
-			"       " #op " %0, %1, %2\n"			\
-			"       s32ex   %0, %3\n"			\
-			"       getex   %0\n"				\
-			"       beqz    %0, 1b\n"			\
-			: "=&a" (result), "=&a" (tmp)			\
-			: "a" (i), "a" (v)				\
+			"1:     l32ex   %[tmp], %[addr]\n"		\
+			"       " #op " %[result], %[tmp], %[i]\n"	\
+			"       s32ex   %[result], %[addr]\n"		\
+			"       getex   %[result]\n"			\
+			"       beqz    %[result], 1b\n"		\
+			: [result] "=&a" (result), [tmp] "=&a" (tmp)	\
+			: [i] "a" (i), [addr] "a" (v)			\
 			: "memory"					\
 			);						\
 }									\
@@ -82,14 +82,14 @@ static inline int atomic_##op##_return(int i, atomic_t *v)		\
 	int result;							\
 									\
 	__asm__ __volatile__(						\
-			"1:     l32ex   %1, %3\n"			\
-			"       " #op " %0, %1, %2\n"			\
-			"       s32ex   %0, %3\n"			\
-			"       getex   %0\n"				\
-			"       beqz    %0, 1b\n"			\
-			"       " #op " %0, %1, %2\n"			\
-			: "=&a" (result), "=&a" (tmp)			\
-			: "a" (i), "a" (v)				\
+			"1:     l32ex   %[tmp], %[addr]\n"		\
+			"       " #op " %[result], %[tmp], %[i]\n"	\
+			"       s32ex   %[result], %[addr]\n"		\
+			"       getex   %[result]\n"			\
+			"       beqz    %[result], 1b\n"		\
+			"       " #op " %[result], %[tmp], %[i]\n"	\
+			: [result] "=&a" (result), [tmp] "=&a" (tmp)	\
+			: [i] "a" (i), [addr] "a" (v)			\
 			: "memory"					\
 			);						\
 									\
@@ -103,13 +103,13 @@ static inline int atomic_fetch_##op(int i, atomic_t *v)			\
 	int result;							\
 									\
 	__asm__ __volatile__(						\
-			"1:     l32ex   %1, %3\n"			\
-			"       " #op " %0, %1, %2\n"			\
-			"       s32ex   %0, %3\n"			\
-			"       getex   %0\n"				\
-			"       beqz    %0, 1b\n"			\
-			: "=&a" (result), "=&a" (tmp)			\
-			: "a" (i), "a" (v)				\
+			"1:     l32ex   %[tmp], %[addr]\n"		\
+			"       " #op " %[result], %[tmp], %[i]\n"	\
+			"       s32ex   %[result], %[addr]\n"		\
+			"       getex   %[result]\n"			\
+			"       beqz    %[result], 1b\n"		\
+			: [result] "=&a" (result), [tmp] "=&a" (tmp)	\
+			: [i] "a" (i), [addr] "a" (v)			\
 			: "memory"					\
 			);						\
 									\
@@ -124,13 +124,14 @@ static inline void atomic_##op(int i, atomic_t * v)			\
 	int result;							\
 									\
 	__asm__ __volatile__(						\
-			"1:     l32i    %1, %3, 0\n"			\
-			"       wsr     %1, scompare1\n"		\
-			"       " #op " %0, %1, %2\n"			\
-			"       s32c1i  %0, %3, 0\n"			\
-			"       bne     %0, %1, 1b\n"			\
-			: "=&a" (result), "=&a" (tmp)			\
-			: "a" (i), "a" (v)				\
+			"1:     l32i    %[tmp], %[mem]\n"		\
+			"       wsr     %[tmp], scompare1\n"		\
+			"       " #op " %[result], %[tmp], %[i]\n"	\
+			"       s32c1i  %[result], %[mem]\n"		\
+			"       bne     %[result], %[tmp], 1b\n"	\
+			: [result] "=&a" (result), [tmp] "=&a" (tmp),	\
+			  [mem] "+m" (*v)				\
+			: [i] "a" (i)					\
 			: "memory"					\
 			);						\
 }									\
@@ -142,14 +143,15 @@ static inline int atomic_##op##_return(int i, atomic_t * v)		\
 	int result;							\
 									\
 	__asm__ __volatile__(						\
-			"1:     l32i    %1, %3, 0\n"			\
-			"       wsr     %1, scompare1\n"		\
-			"       " #op " %0, %1, %2\n"			\
-			"       s32c1i  %0, %3, 0\n"			\
-			"       bne     %0, %1, 1b\n"			\
-			"       " #op " %0, %0, %2\n"			\
-			: "=&a" (result), "=&a" (tmp)			\
-			: "a" (i), "a" (v)				\
+			"1:     l32i    %[tmp], %[mem]\n"		\
+			"       wsr     %[tmp], scompare1\n"		\
+			"       " #op " %[result], %[tmp], %[i]\n"	\
+			"       s32c1i  %[result], %[mem]\n"		\
+			"       bne     %[result], %[tmp], 1b\n"	\
+			"       " #op " %[result], %[result], %[i]\n"	\
+			: [result] "=&a" (result), [tmp] "=&a" (tmp),	\
+			  [mem] "+m" (*v)				\
+			: [i] "a" (i)					\
 			: "memory"					\
 			);						\
 									\
@@ -163,13 +165,14 @@ static inline int atomic_fetch_##op(int i, atomic_t * v)		\
 	int result;							\
 									\
 	__asm__ __volatile__(						\
-			"1:     l32i    %1, %3, 0\n"			\
-			"       wsr     %1, scompare1\n"		\
-			"       " #op " %0, %1, %2\n"			\
-			"       s32c1i  %0, %3, 0\n"			\
-			"       bne     %0, %1, 1b\n"			\
-			: "=&a" (result), "=&a" (tmp)			\
-			: "a" (i), "a" (v)				\
+			"1:     l32i    %[tmp], %[mem]\n"		\
+			"       wsr     %[tmp], scompare1\n"		\
+			"       " #op " %[result], %[tmp], %[i]\n"	\
+			"       s32c1i  %[result], %[mem]\n"		\
+			"       bne     %[result], %[tmp], 1b\n"	\
+			: [result] "=&a" (result), [tmp] "=&a" (tmp),	\
+			  [mem] "+m" (*v)				\
+			: [i] "a" (i)					\
 			: "memory"					\
 			);						\
 									\
@@ -184,14 +187,14 @@ static inline void atomic_##op(int i, atomic_t * v)			\
 	unsigned int vval;						\
 									\
 	__asm__ __volatile__(						\
-			"       rsil    a15, "__stringify(TOPLEVEL)"\n"\
-			"       l32i    %0, %2, 0\n"			\
-			"       " #op " %0, %0, %1\n"			\
-			"       s32i    %0, %2, 0\n"			\
+			"       rsil    a15, "__stringify(TOPLEVEL)"\n"	\
+			"       l32i    %[result], %[mem]\n"		\
+			"       " #op " %[result], %[result], %[i]\n"	\
+			"       s32i    %[result], %[mem]\n"		\
 			"       wsr     a15, ps\n"			\
 			"       rsync\n"				\
-			: "=&a" (vval)					\
-			: "a" (i), "a" (v)				\
+			: [result] "=&a" (vval), [mem] "+m" (*v)	\
+			: [i] "a" (i)					\
 			: "a15", "memory"				\
 			);						\
 }									\
@@ -203,13 +206,13 @@ static inline int atomic_##op##_return(int i, atomic_t * v)		\
 									\
 	__asm__ __volatile__(						\
 			"       rsil    a15,"__stringify(TOPLEVEL)"\n"	\
-			"       l32i    %0, %2, 0\n"			\
-			"       " #op " %0, %0, %1\n"			\
-			"       s32i    %0, %2, 0\n"			\
+			"       l32i    %[result], %[mem]\n"		\
+			"       " #op " %[result], %[result], %[i]\n"	\
+			"       s32i    %[result], %[mem]\n"		\
 			"       wsr     a15, ps\n"			\
 			"       rsync\n"				\
-			: "=&a" (vval)					\
-			: "a" (i), "a" (v)				\
+			: [result] "=&a" (vval), [mem] "+m" (*v)	\
+			: [i] "a" (i)					\
 			: "a15", "memory"				\
 			);						\
 									\
@@ -223,13 +226,14 @@ static inline int atomic_fetch_##op(int i, atomic_t * v)		\
 									\
 	__asm__ __volatile__(						\
 			"       rsil    a15,"__stringify(TOPLEVEL)"\n"	\
-			"       l32i    %0, %3, 0\n"			\
-			"       " #op " %1, %0, %2\n"			\
-			"       s32i    %1, %3, 0\n"			\
+			"       l32i    %[result], %[mem]\n"		\
+			"       " #op " %[tmp], %[result], %[i]\n"	\
+			"       s32i    %[tmp], %[mem]\n"		\
 			"       wsr     a15, ps\n"			\
 			"       rsync\n"				\
-			: "=&a" (vval), "=&a" (tmp)			\
-			: "a" (i), "a" (v)				\
+			: [result] "=&a" (vval), [tmp] "=&a" (tmp),	\
+			  [mem] "+m" (*v)				\
+			: [i] "a" (i)					\
 			: "a15", "memory"				\
 			);						\
 									\

arch/xtensa/include/asm/bitops.h

@@ -98,247 +98,112 @@ static inline unsigned long __fls(unsigned long word)
 
 #if XCHAL_HAVE_EXCLUSIVE
 
-static inline void set_bit(unsigned int bit, volatile unsigned long *p)
-{
-	unsigned long tmp;
-	unsigned long mask = 1UL << (bit & 31);
-
-	p += bit >> 5;
-
-	__asm__ __volatile__(
-			"1:     l32ex   %0, %2\n"
-			"       or      %0, %0, %1\n"
-			"       s32ex   %0, %2\n"
-			"       getex   %0\n"
-			"       beqz    %0, 1b\n"
-			: "=&a" (tmp)
-			: "a" (mask), "a" (p)
-			: "memory");
-}
-
-static inline void clear_bit(unsigned int bit, volatile unsigned long *p)
-{
-	unsigned long tmp;
-	unsigned long mask = 1UL << (bit & 31);
-
-	p += bit >> 5;
-
-	__asm__ __volatile__(
-			"1:     l32ex   %0, %2\n"
-			"       and     %0, %0, %1\n"
-			"       s32ex   %0, %2\n"
-			"       getex   %0\n"
-			"       beqz    %0, 1b\n"
-			: "=&a" (tmp)
-			: "a" (~mask), "a" (p)
-			: "memory");
-}
-
-static inline void change_bit(unsigned int bit, volatile unsigned long *p)
-{
-	unsigned long tmp;
-	unsigned long mask = 1UL << (bit & 31);
-
-	p += bit >> 5;
-
-	__asm__ __volatile__(
-			"1:     l32ex   %0, %2\n"
-			"       xor     %0, %0, %1\n"
-			"       s32ex   %0, %2\n"
-			"       getex   %0\n"
-			"       beqz    %0, 1b\n"
-			: "=&a" (tmp)
-			: "a" (mask), "a" (p)
-			: "memory");
-}
-
-static inline int
-test_and_set_bit(unsigned int bit, volatile unsigned long *p)
-{
-	unsigned long tmp, value;
-	unsigned long mask = 1UL << (bit & 31);
-
-	p += bit >> 5;
-
-	__asm__ __volatile__(
-			"1:     l32ex   %1, %3\n"
-			"       or      %0, %1, %2\n"
-			"       s32ex   %0, %3\n"
-			"       getex   %0\n"
-			"       beqz    %0, 1b\n"
-			: "=&a" (tmp), "=&a" (value)
-			: "a" (mask), "a" (p)
-			: "memory");
-
-	return value & mask;
-}
-
-static inline int
-test_and_clear_bit(unsigned int bit, volatile unsigned long *p)
-{
-	unsigned long tmp, value;
-	unsigned long mask = 1UL << (bit & 31);
-
-	p += bit >> 5;
-
-	__asm__ __volatile__(
-			"1:     l32ex   %1, %3\n"
-			"       and     %0, %1, %2\n"
-			"       s32ex   %0, %3\n"
-			"       getex   %0\n"
-			"       beqz    %0, 1b\n"
-			: "=&a" (tmp), "=&a" (value)
-			: "a" (~mask), "a" (p)
-			: "memory");
-
-	return value & mask;
-}
-
-static inline int
-test_and_change_bit(unsigned int bit, volatile unsigned long *p)
-{
-	unsigned long tmp, value;
-	unsigned long mask = 1UL << (bit & 31);
-
-	p += bit >> 5;
-
-	__asm__ __volatile__(
-			"1:     l32ex   %1, %3\n"
-			"       xor     %0, %1, %2\n"
-			"       s32ex   %0, %3\n"
-			"       getex   %0\n"
-			"       beqz    %0, 1b\n"
-			: "=&a" (tmp), "=&a" (value)
-			: "a" (mask), "a" (p)
-			: "memory");
-
-	return value & mask;
+#define BIT_OP(op, insn, inv)						\
+static inline void op##_bit(unsigned int bit, volatile unsigned long *p)\
+{									\
+	unsigned long tmp;						\
+	unsigned long mask = 1UL << (bit & 31);				\
+									\
+	p += bit >> 5;							\
+									\
+	__asm__ __volatile__(						\
+			"1:     l32ex   %[tmp], %[addr]\n"		\
+			"      "insn"   %[tmp], %[tmp], %[mask]\n"	\
+			"       s32ex   %[tmp], %[addr]\n"		\
+			"       getex   %[tmp]\n"			\
+			"       beqz    %[tmp], 1b\n"			\
+			: [tmp] "=&a" (tmp)				\
+			: [mask] "a" (inv mask), [addr] "a" (p)		\
+			: "memory");					\
+}
+
+#define TEST_AND_BIT_OP(op, insn, inv)					\
+static inline int							\
+test_and_##op##_bit(unsigned int bit, volatile unsigned long *p)	\
+{									\
+	unsigned long tmp, value;					\
+	unsigned long mask = 1UL << (bit & 31);				\
+									\
+	p += bit >> 5;							\
+									\
+	__asm__ __volatile__(						\
+			"1:     l32ex   %[value], %[addr]\n"		\
+			"      "insn"   %[tmp], %[value], %[mask]\n"	\
+			"       s32ex   %[tmp], %[addr]\n"		\
+			"       getex   %[tmp]\n"			\
+			"       beqz    %[tmp], 1b\n"			\
+			: [tmp] "=&a" (tmp), [value] "=&a" (value)	\
+			: [mask] "a" (inv mask), [addr] "a" (p)		\
+			: "memory");					\
+									\
+	return value & mask;						\
 }
 
 #elif XCHAL_HAVE_S32C1I
 
-static inline void set_bit(unsigned int bit, volatile unsigned long *p)
-{
-	unsigned long tmp, value;
-	unsigned long mask = 1UL << (bit & 31);
-
-	p += bit >> 5;
-
-	__asm__ __volatile__(
-			"1:     l32i    %1, %3, 0\n"
-			"       wsr     %1, scompare1\n"
-			"       or      %0, %1, %2\n"
-			"       s32c1i  %0, %3, 0\n"
-			"       bne     %0, %1, 1b\n"
-			: "=&a" (tmp), "=&a" (value)
-			: "a" (mask), "a" (p)
-			: "memory");
-}
-
-static inline void clear_bit(unsigned int bit, volatile unsigned long *p)
-{
-	unsigned long tmp, value;
-	unsigned long mask = 1UL << (bit & 31);
-
-	p += bit >> 5;
-
-	__asm__ __volatile__(
-			"1:     l32i    %1, %3, 0\n"
-			"       wsr     %1, scompare1\n"
-			"       and     %0, %1, %2\n"
-			"       s32c1i  %0, %3, 0\n"
-			"       bne     %0, %1, 1b\n"
-			: "=&a" (tmp), "=&a" (value)
-			: "a" (~mask), "a" (p)
-			: "memory");
+#define BIT_OP(op, insn, inv)						\
+static inline void op##_bit(unsigned int bit, volatile unsigned long *p)\
+{									\
+	unsigned long tmp, value;					\
+	unsigned long mask = 1UL << (bit & 31);				\
+									\
+	p += bit >> 5;							\
+									\
+	__asm__ __volatile__(						\
+			"1:     l32i    %[value], %[mem]\n"		\
+			"       wsr     %[value], scompare1\n"		\
+			"      "insn"   %[tmp], %[value], %[mask]\n"	\
+			"       s32c1i  %[tmp], %[mem]\n"		\
+			"       bne     %[tmp], %[value], 1b\n"		\
+			: [tmp] "=&a" (tmp), [value] "=&a" (value),	\
+			  [mem] "+m" (*p)				\
+			: [mask] "a" (inv mask)				\
+			: "memory");					\
+}
+
+#define TEST_AND_BIT_OP(op, insn, inv)					\
+static inline int							\
+test_and_##op##_bit(unsigned int bit, volatile unsigned long *p)	\
+{									\
+	unsigned long tmp, value;					\
+	unsigned long mask = 1UL << (bit & 31);				\
+									\
+	p += bit >> 5;							\
+									\
+	__asm__ __volatile__(						\
+			"1:     l32i    %[value], %[mem]\n"		\
+			"       wsr     %[value], scompare1\n"		\
+			"      "insn"   %[tmp], %[value], %[mask]\n"	\
+			"       s32c1i  %[tmp], %[mem]\n"		\
+			"       bne     %[tmp], %[value], 1b\n"		\
+			: [tmp] "=&a" (tmp), [value] "=&a" (value),	\
+			  [mem] "+m" (*p)				\
+			: [mask] "a" (inv mask)				\
+			: "memory");					\
+									\
+	return tmp & mask;						\
 }
 
-static inline void change_bit(unsigned int bit, volatile unsigned long *p)
-{
-	unsigned long tmp, value;
-	unsigned long mask = 1UL << (bit & 31);
-
-	p += bit >> 5;
-
-	__asm__ __volatile__(
-			"1:     l32i    %1, %3, 0\n"
-			"       wsr     %1, scompare1\n"
-			"       xor     %0, %1, %2\n"
-			"       s32c1i  %0, %3, 0\n"
-			"       bne     %0, %1, 1b\n"
-			: "=&a" (tmp), "=&a" (value)
-			: "a" (mask), "a" (p)
-			: "memory");
-}
+#else
 
-static inline int
-test_and_set_bit(unsigned int bit, volatile unsigned long *p)
-{
-	unsigned long tmp, value;
-	unsigned long mask = 1UL << (bit & 31);
-
-	p += bit >> 5;
-
-	__asm__ __volatile__(
-			"1:     l32i    %1, %3, 0\n"
-			"       wsr     %1, scompare1\n"
-			"       or      %0, %1, %2\n"
-			"       s32c1i  %0, %3, 0\n"
-			"       bne     %0, %1, 1b\n"
-			: "=&a" (tmp), "=&a" (value)
-			: "a" (mask), "a" (p)
-			: "memory");
-
-	return tmp & mask;
-}
+#define BIT_OP(op, insn, inv)
+#define TEST_AND_BIT_OP(op, insn, inv)
 
-static inline int
-test_and_clear_bit(unsigned int bit, volatile unsigned long *p)
-{
-	unsigned long tmp, value;
-	unsigned long mask = 1UL << (bit & 31);
-
-	p += bit >> 5;
-
-	__asm__ __volatile__(
-			"1:     l32i    %1, %3, 0\n"
-			"       wsr     %1, scompare1\n"
-			"       and     %0, %1, %2\n"
-			"       s32c1i  %0, %3, 0\n"
-			"       bne     %0, %1, 1b\n"
-			: "=&a" (tmp), "=&a" (value)
-			: "a" (~mask), "a" (p)
-			: "memory");
-
-	return tmp & mask;
-}
+#include <asm-generic/bitops/atomic.h>
 
-static inline int
-test_and_change_bit(unsigned int bit, volatile unsigned long *p)
-{
-	unsigned long tmp, value;
-	unsigned long mask = 1UL << (bit & 31);
-
-	p += bit >> 5;
-
-	__asm__ __volatile__(
-			"1:     l32i    %1, %3, 0\n"
-			"       wsr     %1, scompare1\n"
-			"       xor     %0, %1, %2\n"
-			"       s32c1i  %0, %3, 0\n"
-			"       bne     %0, %1, 1b\n"
-			: "=&a" (tmp), "=&a" (value)
-			: "a" (mask), "a" (p)
-			: "memory");
-
-	return tmp & mask;
-}
+#endif /* XCHAL_HAVE_S32C1I */
 
-#else
+#define BIT_OPS(op, insn, inv)		\
+	BIT_OP(op, insn, inv)		\
+	TEST_AND_BIT_OP(op, insn, inv)
 
-#include <asm-generic/bitops/atomic.h>
+BIT_OPS(set, "or", )
+BIT_OPS(clear, "and", ~)
+BIT_OPS(change, "xor", )
 
-#endif /* XCHAL_HAVE_S32C1I */
+#undef BIT_OPS
+#undef BIT_OP
+#undef TEST_AND_BIT_OP
 
 #include <asm-generic/bitops/find.h>
 #include <asm-generic/bitops/le.h>

arch/xtensa/include/asm/cache.h

@@ -31,4 +31,10 @@
 
 #define ARCH_DMA_MINALIGN	L1_CACHE_BYTES
 
+/*
+ * R/O after init is actually writable, it cannot go to .rodata
+ * according to vmlinux linker script.
+ */
+#define __ro_after_init __read_mostly
+
 #endif	/* _XTENSA_CACHE_H */

arch/xtensa/include/asm/cmpxchg.h

@@ -27,25 +27,25 @@ __cmpxchg_u32(volatile int *p, int old, int new)
 	unsigned long tmp, result;
 
 	__asm__ __volatile__(
-			"1:     l32ex   %0, %3\n"
-			"       bne     %0, %4, 2f\n"
-			"       mov     %1, %2\n"
-			"       s32ex   %1, %3\n"
-			"       getex   %1\n"
-			"       beqz    %1, 1b\n"
+			"1:     l32ex   %[result], %[addr]\n"
+			"       bne     %[result], %[cmp], 2f\n"
+			"       mov     %[tmp], %[new]\n"
+			"       s32ex   %[tmp], %[addr]\n"
+			"       getex   %[tmp]\n"
+			"       beqz    %[tmp], 1b\n"
 			"2:\n"
-			: "=&a" (result), "=&a" (tmp)
-			: "a" (new), "a" (p), "a" (old)
+			: [result] "=&a" (result), [tmp] "=&a" (tmp)
+			: [new] "a" (new), [addr] "a" (p), [cmp] "a" (old)
 			: "memory"
 			);
 
 	return result;
 #elif XCHAL_HAVE_S32C1I
 	__asm__ __volatile__(
-			"       wsr     %2, scompare1\n"
-			"       s32c1i  %0, %1, 0\n"
-			: "+a" (new)
-			: "a" (p), "a" (old)
+			"       wsr     %[cmp], scompare1\n"
+			"       s32c1i  %[new], %[mem]\n"
+			: [new] "+a" (new), [mem] "+m" (*p)
+			: [cmp] "a" (old)
 			: "memory"
 			);
 
@@ -53,14 +53,14 @@ __cmpxchg_u32(volatile int *p, int old, int new)
 #else
 	__asm__ __volatile__(
 			"       rsil    a15, "__stringify(TOPLEVEL)"\n"
-			"       l32i    %0, %1, 0\n"
-			"       bne     %0, %2, 1f\n"
-			"       s32i    %3, %1, 0\n"
+			"       l32i    %[old], %[mem]\n"
+			"       bne     %[old], %[cmp], 1f\n"
+			"       s32i    %[new], %[mem]\n"
 			"1:\n"
 			"       wsr     a15, ps\n"
 			"       rsync\n"
-			: "=&a" (old)
-			: "a" (p), "a" (old), "r" (new)
+			: [old] "=&a" (old), [mem] "+m" (*p)
+			: [cmp] "a" (old), [new] "r" (new)
 			: "a15", "memory");
 	return old;
 #endif
@@ -129,13 +129,13 @@ static inline unsigned long xchg_u32(volatile int * m, unsigned long val)
 	unsigned long tmp, result;
 
 	__asm__ __volatile__(
-			"1:     l32ex   %0, %3\n"
-			"       mov     %1, %2\n"
-			"       s32ex   %1, %3\n"
-			"       getex   %1\n"
-			"       beqz    %1, 1b\n"
-			: "=&a" (result), "=&a" (tmp)
-			: "a" (val), "a" (m)
+			"1:     l32ex   %[result], %[addr]\n"
+			"       mov     %[tmp], %[val]\n"
+			"       s32ex   %[tmp], %[addr]\n"
+			"       getex   %[tmp]\n"
+			"       beqz    %[tmp], 1b\n"
+			: [result] "=&a" (result), [tmp] "=&a" (tmp)
+			: [val] "a" (val), [addr] "a" (m)
 			: "memory"
 			);
 
@@ -143,13 +143,14 @@ static inline unsigned long xchg_u32(volatile int * m, unsigned long val)
 #elif XCHAL_HAVE_S32C1I
 	unsigned long tmp, result;
 	__asm__ __volatile__(
-			"1:     l32i    %1, %2, 0\n"
-			"       mov     %0, %3\n"
-			"       wsr     %1, scompare1\n"
-			"       s32c1i  %0, %2, 0\n"
-			"       bne     %0, %1, 1b\n"
-			: "=&a" (result), "=&a" (tmp)
-			: "a" (m), "a" (val)
+			"1:     l32i    %[tmp], %[mem]\n"
+			"       mov     %[result], %[val]\n"
+			"       wsr     %[tmp], scompare1\n"
+			"       s32c1i  %[result], %[mem]\n"
+			"       bne     %[result], %[tmp], 1b\n"
+			: [result] "=&a" (result), [tmp] "=&a" (tmp),
+			  [mem] "+m" (*m)
+			: [val] "a" (val)
 			: "memory"
 			);
 	return result;
@@ -157,12 +158,12 @@ static inline unsigned long xchg_u32(volatile int * m, unsigned long val)
 	unsigned long tmp;
 	__asm__ __volatile__(
 			"       rsil    a15, "__stringify(TOPLEVEL)"\n"
-			"       l32i    %0, %1, 0\n"
-			"       s32i    %2, %1, 0\n"
+			"       l32i    %[tmp], %[mem]\n"
+			"       s32i    %[val], %[mem]\n"
 			"       wsr     a15, ps\n"
 			"       rsync\n"
-			: "=&a" (tmp)
-			: "a" (m), "a" (val)
+			: [tmp] "=&a" (tmp), [mem] "+m" (*m)
+			: [val] "a" (val)
 			: "a15", "memory");
 	return tmp;
 #endif

arch/xtensa/include/asm/fixmap.h

@@ -78,8 +78,10 @@ static inline unsigned long virt_to_fix(const unsigned long vaddr)
 
 #define kmap_get_fixmap_pte(vaddr) \
 	pte_offset_kernel( \
-		pmd_offset(pud_offset(pgd_offset_k(vaddr), (vaddr)), (vaddr)), \
-		(vaddr) \
-	)
+		pmd_offset(pud_offset(p4d_offset(pgd_offset_k(vaddr), \
+						 (vaddr)), \
+				      (vaddr)), \
+			   (vaddr)), \
+		(vaddr))
 
 #endif

arch/xtensa/include/asm/futex.h

@@ -43,10 +43,10 @@
 #elif XCHAL_HAVE_S32C1I
 #define __futex_atomic_op(insn, ret, old, uaddr, arg)	\
 	__asm__ __volatile(				\
-	"1:	l32i	%[oldval], %[addr], 0\n"	\
+	"1:	l32i	%[oldval], %[mem]\n"		\
 		insn "\n"				\
 	"	wsr	%[oldval], scompare1\n"		\
-	"2:	s32c1i	%[newval], %[addr], 0\n"	\
+	"2:	s32c1i	%[newval], %[mem]\n"		\
 	"	bne	%[newval], %[oldval], 1b\n"	\
 	"	movi	%[newval], 0\n"			\
 	"3:\n"						\
@@ -60,9 +60,9 @@
 	"	.section __ex_table,\"a\"\n"		\
 	"	.long 1b, 5b, 2b, 5b\n"			\
 	"	.previous\n"				\
-	: [oldval] "=&r" (old), [newval] "=&r" (ret)	\
-	: [addr] "r" (uaddr), [oparg] "r" (arg),	\
-	  [fault] "I" (-EFAULT)				\
+	: [oldval] "=&r" (old), [newval] "=&r" (ret),	\
+	  [mem] "+m" (*(uaddr))				\
+	: [oparg] "r" (arg), [fault] "I" (-EFAULT)	\
 	: "memory")
 #endif
 

arch/xtensa/include/asm/hw_irq.h

-/*
- * include/asm-xtensa/hw_irq.h
- *
- * This file is subject to the terms and conditions of the GNU General
- * Public License.  See the file "COPYING" in the main directory of
- * this archive for more details.
- *
- * Copyright (C) 2002 - 2005 Tensilica Inc.
- */
-
-#ifndef _XTENSA_HW_IRQ_H
-#define _XTENSA_HW_IRQ_H
-
-#endif

arch/xtensa/include/asm/initialize_mmu.h

@@ -23,6 +23,7 @@
 #ifndef _XTENSA_INITIALIZE_MMU_H
 #define _XTENSA_INITIALIZE_MMU_H
 
+#include <linux/init.h>
 #include <asm/pgtable.h>
 #include <asm/vectors.h>
 
@@ -183,7 +184,7 @@
 #endif
 
 #if XCHAL_HAVE_MPU
-	.data
+	__REFCONST
 	.align	4
 .Lattribute_table:
 	.long 0x000000, 0x1fff00, 0x1ddf00, 0x1eef00

arch/xtensa/include/asm/kmem_layout.h

@@ -11,6 +11,7 @@
 #ifndef _XTENSA_KMEM_LAYOUT_H
 #define _XTENSA_KMEM_LAYOUT_H
 
+#include <asm/core.h>
 #include <asm/types.h>
 
 #ifdef CONFIG_MMU
@@ -65,6 +66,34 @@
 
 #endif
 
+/* KIO definition */
+
+#if XCHAL_HAVE_PTP_MMU
+#define XCHAL_KIO_CACHED_VADDR		0xe0000000
+#define XCHAL_KIO_BYPASS_VADDR		0xf0000000
+#define XCHAL_KIO_DEFAULT_PADDR		0xf0000000
+#else
+#define XCHAL_KIO_BYPASS_VADDR		XCHAL_KIO_PADDR
+#define XCHAL_KIO_DEFAULT_PADDR		0x90000000
+#endif
+#define XCHAL_KIO_SIZE			0x10000000
+
+#if (!XCHAL_HAVE_PTP_MMU || XCHAL_HAVE_SPANNING_WAY) && defined(CONFIG_OF)
+#define XCHAL_KIO_PADDR			xtensa_get_kio_paddr()
+#ifndef __ASSEMBLY__
+extern unsigned long xtensa_kio_paddr;
+
+static inline unsigned long xtensa_get_kio_paddr(void)
+{
+	return xtensa_kio_paddr;
+}
+#endif
+#else
+#define XCHAL_KIO_PADDR			XCHAL_KIO_DEFAULT_PADDR
+#endif
+
+/* KERNEL_STACK definition */
+
 #ifndef CONFIG_KASAN
 #define KERNEL_STACK_SHIFT	13
 #else

arch/xtensa/include/asm/page.h

@@ -169,7 +169,18 @@ static inline unsigned long ___pa(unsigned long va)
 	if (off >= XCHAL_KSEG_SIZE)
 		off -= XCHAL_KSEG_SIZE;
 
+#ifndef CONFIG_XIP_KERNEL
 	return off + PHYS_OFFSET;
+#else
+	if (off < XCHAL_KSEG_SIZE)
+		return off + PHYS_OFFSET;
+
+	off -= XCHAL_KSEG_SIZE;
+	if (off >= XCHAL_KIO_SIZE)
+		off -= XCHAL_KIO_SIZE;
+
+	return off + XCHAL_KIO_PADDR;
+#endif
 }
 #define __pa(x)	___pa((unsigned long)(x))
 #else

arch/xtensa/include/asm/pgtable.h

@@ -8,7 +8,6 @@
 #ifndef _XTENSA_PGTABLE_H
 #define _XTENSA_PGTABLE_H
 
-#define __ARCH_USE_5LEVEL_HACK
 #include <asm/page.h>
 #include <asm/kmem_layout.h>
 #include <asm-generic/pgtable-nopmd.h>
@@ -371,9 +370,6 @@ ptep_set_wrprotect(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
 
 #define pgd_index(address)	((address) >> PGDIR_SHIFT)
 
-/* Find an entry in the second-level page table.. */
-#define pmd_offset(dir,address) ((pmd_t*)(dir))
-
 /* Find an entry in the third-level page table.. */
 #define pte_index(address)	(((address) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
 #define pte_offset_kernel(dir,addr) 					\

arch/xtensa/include/asm/processor.h

@@ -195,6 +195,7 @@ struct thread_struct {
 /* Clearing a0 terminates the backtrace. */
 #define start_thread(regs, new_pc, new_sp) \
 	do { \
+		unsigned long syscall = (regs)->syscall; \
 		memset((regs), 0, sizeof(*(regs))); \
 		(regs)->pc = (new_pc); \
 		(regs)->ps = USER_PS_VALUE; \
@@ -204,7 +205,7 @@ struct thread_struct {
 		(regs)->depc = 0; \
 		(regs)->windowbase = 0; \
 		(regs)->windowstart = 1; \
-		(regs)->syscall = NO_SYSCALL; \
+		(regs)->syscall = syscall; \
 	} while (0)
 
 /* Forward declaration */

arch/xtensa/include/asm/syscall.h

@@ -51,7 +51,7 @@ static inline void syscall_set_return_value(struct task_struct *task,
 					    struct pt_regs *regs,
 					    int error, long val)
 {
-	regs->areg[0] = (long) error ? error : val;
+	regs->areg[2] = (long) error ? error : val;
 }
 
 #define SYSCALL_MAX_ARGS 6
@@ -79,7 +79,7 @@ static inline void syscall_set_arguments(struct task_struct *task,
 		regs->areg[reg[i]] = args[i];
 }
 
-asmlinkage long xtensa_rt_sigreturn(struct pt_regs*);
+asmlinkage long xtensa_rt_sigreturn(void);
 asmlinkage long xtensa_shmat(int, char __user *, int);
 asmlinkage long xtensa_fadvise64_64(int, int,
 				    unsigned long long, unsigned long long);

arch/xtensa/include/asm/uaccess.h

@@ -132,13 +132,13 @@ do {									\
 #define __check_align_1  ""
 
 #define __check_align_2				\
-	"   _bbci.l %[addr], 0, 1f	\n"	\
+	"   _bbci.l %[mem] * 0, 1f	\n"	\
 	"   movi    %[err], %[efault]	\n"	\
 	"   _j      2f			\n"
 
 #define __check_align_4				\
-	"   _bbsi.l %[addr], 0, 0f	\n"	\
-	"   _bbci.l %[addr], 1, 1f	\n"	\
+	"   _bbsi.l %[mem] * 0, 0f	\n"	\
+	"   _bbci.l %[mem] * 0 + 1, 1f	\n"	\
 	"0: movi    %[err], %[efault]	\n"	\
 	"   _j      2f			\n"
 
@@ -154,7 +154,7 @@ do {									\
 #define __put_user_asm(x_, addr_, err_, align, insn, cb)\
 __asm__ __volatile__(					\
 	__check_align_##align				\
-	"1: "insn"  %[x], %[addr], 0	\n"		\
+	"1: "insn"  %[x], %[mem]	\n"		\
 	"2:				\n"		\
 	"   .section  .fixup,\"ax\"	\n"		\
 	"   .align 4			\n"		\
@@ -167,8 +167,8 @@ __asm__ __volatile__(					\
 	"   .section  __ex_table,\"a\"	\n"		\
 	"   .long	1b, 5b		\n"		\
 	"   .previous"					\
-	:[err] "+r"(err_), [tmp] "=r"(cb)		\
-	:[x] "r"(x_), [addr] "r"(addr_), [efault] "i"(-EFAULT))
+	:[err] "+r"(err_), [tmp] "=r"(cb), [mem] "=m"(*(addr_))		\
+	:[x] "r"(x_), [efault] "i"(-EFAULT))
 
 #define __get_user_nocheck(x, ptr, size)			\
 ({								\
@@ -222,7 +222,7 @@ do {							\
 	u32 __x = 0;					\
 	__asm__ __volatile__(				\
 		__check_align_##align			\
-		"1: "insn"  %[x], %[addr], 0	\n"	\
+		"1: "insn"  %[x], %[mem]	\n"	\
 		"2:				\n"	\
 		"   .section  .fixup,\"ax\"	\n"	\
 		"   .align 4			\n"	\
@@ -236,7 +236,7 @@ do {							\
 		"   .long	1b, 5b		\n"	\
 		"   .previous"				\
 		:[err] "+r"(err_), [tmp] "=r"(cb), [x] "+r"(__x) \
-		:[addr] "r"(addr_), [efault] "i"(-EFAULT)); \
+		:[mem] "m"(*(addr_)), [efault] "i"(-EFAULT)); \
 	(x_) = (__force __typeof__(*(addr_)))__x;	\
 } while (0)
 

arch/xtensa/include/asm/user.h

-/*
- * include/asm-xtensa/user.h
- *
- * Xtensa Processor version.
- *
- * This file is subject to the terms and conditions of the GNU General Public
- * License.  See the file "COPYING" in the main directory of this archive
- * for more details.
- *
- * Copyright (C) 2001 - 2005 Tensilica Inc.
- */
-
-#ifndef _XTENSA_USER_H
-#define _XTENSA_USER_H
-
-/* This file usually defines a 'struct user' structure. However, it it only
- * used for a.out file, which are not supported on Xtensa.
- */
-
-#endif	/* _XTENSA_USER_H */

arch/xtensa/include/asm/vectors.h

@@ -21,50 +21,18 @@
 #include <asm/core.h>
 #include <asm/kmem_layout.h>
 
-#if XCHAL_HAVE_PTP_MMU
-#define XCHAL_KIO_CACHED_VADDR		0xe0000000
-#define XCHAL_KIO_BYPASS_VADDR		0xf0000000
-#define XCHAL_KIO_DEFAULT_PADDR		0xf0000000
+#if defined(CONFIG_MMU) && XCHAL_HAVE_PTP_MMU && XCHAL_HAVE_SPANNING_WAY
+#ifdef CONFIG_KERNEL_VIRTUAL_ADDRESS
+#define KERNELOFFSET			CONFIG_KERNEL_VIRTUAL_ADDRESS
 #else
-#define XCHAL_KIO_BYPASS_VADDR		XCHAL_KIO_PADDR
-#define XCHAL_KIO_DEFAULT_PADDR		0x90000000
-#endif
-#define XCHAL_KIO_SIZE			0x10000000
-
-#if (!XCHAL_HAVE_PTP_MMU || XCHAL_HAVE_SPANNING_WAY) && defined(CONFIG_OF)
-#define XCHAL_KIO_PADDR			xtensa_get_kio_paddr()
-#ifndef __ASSEMBLY__
-extern unsigned long xtensa_kio_paddr;
-
-static inline unsigned long xtensa_get_kio_paddr(void)
-{
-	return xtensa_kio_paddr;
-}
-#endif
-#else
-#define XCHAL_KIO_PADDR			XCHAL_KIO_DEFAULT_PADDR
-#endif
-
-#if defined(CONFIG_MMU)
-
-#if XCHAL_HAVE_PTP_MMU && XCHAL_HAVE_SPANNING_WAY
-/* Image Virtual Start Address */
-#define KERNELOFFSET			(XCHAL_KSEG_CACHED_VADDR + \
-					 CONFIG_KERNEL_LOAD_ADDRESS - \
+#define KERNELOFFSET			(CONFIG_KERNEL_LOAD_ADDRESS + \
+					 XCHAL_KSEG_CACHED_VADDR - \
 					 XCHAL_KSEG_PADDR)
+#endif
 #else
 #define KERNELOFFSET			CONFIG_KERNEL_LOAD_ADDRESS
 #endif
 
-#else /* !defined(CONFIG_MMU) */
-  /* MMU Not being used - Virtual == Physical */
-
-/* Location of the start of the kernel text, _start */
-#define KERNELOFFSET			CONFIG_KERNEL_LOAD_ADDRESS
-
-
-#endif /* CONFIG_MMU */
-
 #define RESET_VECTOR1_VADDR		(XCHAL_RESET_VECTOR1_VADDR)
 #ifdef CONFIG_VECTORS_OFFSET
 #define VECBASE_VADDR			(KERNELOFFSET - CONFIG_VECTORS_OFFSET)

arch/xtensa/kernel/coprocessor.S

@@ -15,17 +15,9 @@
 #include <linux/linkage.h>
 #include <asm/asm-offsets.h>
 #include <asm/asmmacro.h>
-#include <asm/processor.h>
 #include <asm/coprocessor.h>
-#include <asm/thread_info.h>
-#include <asm/asm-uaccess.h>
-#include <asm/unistd.h>
-#include <asm/ptrace.h>
 #include <asm/current.h>
-#include <asm/pgtable.h>
-#include <asm/page.h>
-#include <asm/signal.h>
-#include <asm/tlbflush.h>
+#include <asm/regs.h>
 
 #if XTENSA_HAVE_COPROCESSORS
 

arch/xtensa/kernel/entry.S

@@ -529,7 +529,7 @@ common_exception_return:
 	l32i	a4, a2, TI_PRE_COUNT
 	bnez	a4, 4f
 	call4	preempt_schedule_irq
-	j	1b
+	j	4f
 #endif
 
 #if XTENSA_FAKE_NMI
@@ -1876,8 +1876,7 @@ ENDPROC(fast_store_prohibited)
 
 ENTRY(system_call)
 
-	/* reserve 4 bytes on stack for function parameter */
-	abi_entry(4)
+	abi_entry_default
 
 	/* regs->syscall = regs->areg[2] */
 
@@ -1892,11 +1891,10 @@ ENTRY(system_call)
 
 	mov	a6, a2
 	call4	do_syscall_trace_enter
+	beqz	a6, .Lsyscall_exit
 	l32i	a7, a2, PT_SYSCALL
 
 1:
-	s32i	a7, a1, 4
-
 	/* syscall = sys_call_table[syscall_nr] */
 
 	movi	a4, sys_call_table
@@ -1906,8 +1904,6 @@ ENTRY(system_call)
 
 	addx4	a4, a7, a4
 	l32i	a4, a4, 0
-	movi	a5, sys_ni_syscall;
-	beq	a4, a5, 1f
 
 	/* Load args: arg0 - arg5 are passed via regs. */
 
@@ -1918,25 +1914,19 @@ ENTRY(system_call)
 	l32i	a10, a2, PT_AREG8
 	l32i	a11, a2, PT_AREG9
 
-	/* Pass one additional argument to the syscall: pt_regs (on stack) */
-	s32i	a2, a1, 0
-
 	callx4	a4
 
 1:	/* regs->areg[2] = return_value */
 
 	s32i	a6, a2, PT_AREG2
 	bnez	a3, 1f
-	abi_ret(4)
+.Lsyscall_exit:
+	abi_ret_default
 
 1:
-	l32i	a4, a1, 4
-	l32i	a3, a2, PT_SYSCALL
-	s32i	a4, a2, PT_SYSCALL
 	mov	a6, a2
 	call4	do_syscall_trace_leave
-	s32i	a3, a2, PT_SYSCALL
-	abi_ret(4)
+	abi_ret_default
 
 ENDPROC(system_call)
 

arch/xtensa/kernel/head.S

@@ -260,6 +260,13 @@ ENTRY(_startup)
 	___invalidate_icache_all a2 a3
 	isync
 
+#ifdef CONFIG_XIP_KERNEL
+	/* Setup bootstrap CPU stack in XIP kernel */
+
+	movi	a1, start_info
+	l32i	a1, a1, 0
+#endif
+
 	movi	a6, 0
 	xsr	a6, excsave1
 
@@ -355,10 +362,10 @@ ENDPROC(cpu_restart)
  * DATA section
  */
 
-        .section ".data.init.refok"
-        .align  4
+	__REFDATA
+	.align  4
 ENTRY(start_info)
-        .long   init_thread_union + KERNEL_STACK_SIZE
+	.long	init_thread_union + KERNEL_STACK_SIZE
 
 /*
  * BSS section

arch/xtensa/kernel/process.c

@@ -264,6 +264,8 @@ int copy_thread(unsigned long clone_flags, unsigned long usp_thread_fn,
 			       &regs->areg[XCHAL_NUM_AREGS - len/4], len);
 		}
 
+		childregs->syscall = regs->syscall;
+
 		/* The thread pointer is passed in the '4th argument' (= a5) */
 		if (clone_flags & CLONE_SETTLS)
 			childregs->threadptr = childregs->areg[5];

arch/xtensa/kernel/ptrace.c

@@ -542,14 +542,28 @@ long arch_ptrace(struct task_struct *child, long request,
 	return ret;
 }
 
-void do_syscall_trace_enter(struct pt_regs *regs)
+void do_syscall_trace_leave(struct pt_regs *regs);
+int do_syscall_trace_enter(struct pt_regs *regs)
 {
+	if (regs->syscall == NO_SYSCALL)
+		regs->areg[2] = -ENOSYS;
+
 	if (test_thread_flag(TIF_SYSCALL_TRACE) &&
-	    tracehook_report_syscall_entry(regs))
+	    tracehook_report_syscall_entry(regs)) {
+		regs->areg[2] = -ENOSYS;
 		regs->syscall = NO_SYSCALL;
+		return 0;
+	}
+
+	if (regs->syscall == NO_SYSCALL) {
+		do_syscall_trace_leave(regs);
+		return 0;
+	}
 
 	if (test_thread_flag(TIF_SYSCALL_TRACEPOINT))
 		trace_sys_enter(regs, syscall_get_nr(current, regs));
+
+	return 1;
 }
 
 void do_syscall_trace_leave(struct pt_regs *regs)

arch/xtensa/kernel/setup.c

@@ -308,6 +308,10 @@ extern char _Level6InterruptVector_text_end;
 extern char _SecondaryResetVector_text_start;
 extern char _SecondaryResetVector_text_end;
 #endif
+#ifdef CONFIG_XIP_KERNEL
+extern char _xip_start[];
+extern char _xip_end[];
+#endif
 
 static inline int __init_memblock mem_reserve(unsigned long start,
 					      unsigned long end)
@@ -339,6 +343,9 @@ void __init setup_arch(char **cmdline_p)
 #endif
 
 	mem_reserve(__pa(_stext), __pa(_end));
+#ifdef CONFIG_XIP_KERNEL
+	mem_reserve(__pa(_xip_start), __pa(_xip_end));
+#endif
 
 #ifdef CONFIG_VECTORS_OFFSET
 	mem_reserve(__pa(&_WindowVectors_text_start),

arch/xtensa/kernel/signal.c

@@ -236,9 +236,9 @@ restore_sigcontext(struct pt_regs *regs, struct rt_sigframe __user *frame)
  * Do a signal return; undo the signal stack.
  */
 
-asmlinkage long xtensa_rt_sigreturn(long a0, long a1, long a2, long a3,
-				    long a4, long a5, struct pt_regs *regs)
+asmlinkage long xtensa_rt_sigreturn(void)
 {
+	struct pt_regs *regs = current_pt_regs();
 	struct rt_sigframe __user *frame;
 	sigset_t set;
 	int ret;

arch/xtensa/kernel/traps.c

@@ -491,32 +491,27 @@ void show_trace(struct task_struct *task, unsigned long *sp)
 
 	pr_info("Call Trace:\n");
 	walk_stackframe(sp, show_trace_cb, NULL);
-#ifndef CONFIG_KALLSYMS
-	pr_cont("\n");
-#endif
 }
 
-static int kstack_depth_to_print = 24;
+#define STACK_DUMP_ENTRY_SIZE 4
+#define STACK_DUMP_LINE_SIZE 32
+static size_t kstack_depth_to_print = CONFIG_PRINT_STACK_DEPTH;
 
 void show_stack(struct task_struct *task, unsigned long *sp)
 {
-	int i = 0;
-	unsigned long *stack;
+	size_t len;
 
 	if (!sp)
 		sp = stack_pointer(task);
-	stack = sp;
 
-	pr_info("Stack:\n");
+	len = min((-(size_t)sp) & (THREAD_SIZE - STACK_DUMP_ENTRY_SIZE),
+		  kstack_depth_to_print * STACK_DUMP_ENTRY_SIZE);
 
-	for (i = 0; i < kstack_depth_to_print; i++) {
-		if (kstack_end(sp))
-			break;
-		pr_cont(" %08lx", *sp++);
-		if (i % 8 == 7)
-			pr_cont("\n");
-	}
-	show_trace(task, stack);
+	pr_info("Stack:\n");
+	print_hex_dump(KERN_INFO, " ", DUMP_PREFIX_NONE,
+		       STACK_DUMP_LINE_SIZE, STACK_DUMP_ENTRY_SIZE,
+		       sp, len, false);
+	show_trace(task, sp);
 }
 
 DEFINE_SPINLOCK(die_lock);

arch/xtensa/kernel/vmlinux.lds.S

@@ -119,7 +119,7 @@ SECTIONS
     SCHED_TEXT
     CPUIDLE_TEXT
     LOCK_TEXT
-
+    *(.fixup)
   }
   _etext = .;
   PROVIDE (etext = .);
@@ -128,12 +128,11 @@ SECTIONS
 
   RO_DATA(4096)
 
-  /*  Relocation table */
-
-  .fixup   : { *(.fixup) }
-
   /* Data section */
 
+#ifdef CONFIG_XIP_KERNEL
+  INIT_TEXT_SECTION(PAGE_SIZE)
+#else
   _sdata = .;
   RW_DATA(XCHAL_ICACHE_LINESIZE, PAGE_SIZE, THREAD_SIZE)
   _edata = .;
@@ -147,6 +146,11 @@ SECTIONS
   .init.data :
   {
     INIT_DATA
+  }
+#endif
+
+  .init.rodata :
+  {
     . = ALIGN(0x4);
     __tagtable_begin = .;
     *(.taglist)
@@ -187,12 +191,16 @@ SECTIONS
     RELOCATE_ENTRY(_DebugInterruptVector_text,
 		   .DebugInterruptVector.text);
 #endif
+#ifdef CONFIG_XIP_KERNEL
+    RELOCATE_ENTRY(_xip_data, .data);
+    RELOCATE_ENTRY(_xip_init_data, .init.data);
+#else
 #if defined(CONFIG_SMP)
     RELOCATE_ENTRY(_SecondaryResetVector_text,
 		   .SecondaryResetVector.text);
+#endif
 #endif
 
-  
     __boot_reloc_table_end = ABSOLUTE(.) ;
 
     INIT_SETUP(XCHAL_ICACHE_LINESIZE)
@@ -278,7 +286,7 @@ SECTIONS
   . = (LOADADDR( .DoubleExceptionVector.text ) + SIZEOF( .DoubleExceptionVector.text ) + 3) & ~ 3;
 
 #endif
-#if defined(CONFIG_SMP)
+#if !defined(CONFIG_XIP_KERNEL) && defined(CONFIG_SMP)
 
   SECTION_VECTOR (_SecondaryResetVector_text,
 		  .SecondaryResetVector.text,
@@ -291,12 +299,48 @@ SECTIONS
 
   . = ALIGN(PAGE_SIZE);
 
+#ifndef CONFIG_XIP_KERNEL
   __init_end = .;
 
   BSS_SECTION(0, 8192, 0)
+#endif
 
   _end = .;
 
+#ifdef CONFIG_XIP_KERNEL
+  . = CONFIG_XIP_DATA_ADDR;
+
+  _xip_start = .;
+
+#undef LOAD_OFFSET
+#define LOAD_OFFSET \
+  (CONFIG_XIP_DATA_ADDR - (LOADADDR(.dummy) + SIZEOF(.dummy) + 3) & ~ 3)
+
+  _xip_data_start = .;
+  _sdata = .;
+  RW_DATA(XCHAL_ICACHE_LINESIZE, PAGE_SIZE, THREAD_SIZE)
+  _edata = .;
+  _xip_data_end = .;
+
+  /* Initialization data: */
+
+  STRUCT_ALIGN();
+
+  _xip_init_data_start = .;
+  __init_begin = .;
+  .init.data :
+  {
+    INIT_DATA
+  }
+  _xip_init_data_end = .;
+  __init_end = .;
+  BSS_SECTION(0, 8192, 0)
+
+  _xip_end = .;
+
+#undef LOAD_OFFSET
+#endif
+
   DWARF_DEBUG
 
   .xt.prop 0 : { KEEP(*(.xt.prop .xt.prop.* .gnu.linkonce.prop.*)) }

arch/xtensa/mm/fault.c

@@ -197,6 +197,8 @@ void do_page_fault(struct pt_regs *regs)
 		struct mm_struct *act_mm = current->active_mm;
 		int index = pgd_index(address);
 		pgd_t *pgd, *pgd_k;
+		p4d_t *p4d, *p4d_k;
+		pud_t *pud, *pud_k;
 		pmd_t *pmd, *pmd_k;
 		pte_t *pte_k;
 
@@ -211,8 +213,18 @@ void do_page_fault(struct pt_regs *regs)
 
 		pgd_val(*pgd) = pgd_val(*pgd_k);
 
-		pmd = pmd_offset(pgd, address);
-		pmd_k = pmd_offset(pgd_k, address);
+		p4d = p4d_offset(pgd, address);
+		p4d_k = p4d_offset(pgd_k, address);
+		if (!p4d_present(*p4d) || !p4d_present(*p4d_k))
+			goto bad_page_fault;
+
+		pud = pud_offset(p4d, address);
+		pud_k = pud_offset(p4d_k, address);
+		if (!pud_present(*pud) || !pud_present(*pud_k))
+			goto bad_page_fault;
+
+		pmd = pmd_offset(pud, address);
+		pmd_k = pmd_offset(pud_k, address);
 		if (!pmd_present(*pmd) || !pmd_present(*pmd_k))
 			goto bad_page_fault;
 

arch/xtensa/mm/init.c

@@ -193,8 +193,8 @@ void __init mem_init(void)
 		((max_low_pfn - min_low_pfn) * PAGE_SIZE) >> 20,
 		(unsigned long)_text, (unsigned long)_etext,
 		(unsigned long)(_etext - _text) >> 10,
-		(unsigned long)__start_rodata, (unsigned long)_sdata,
-		(unsigned long)(_sdata - __start_rodata) >> 10,
+		(unsigned long)__start_rodata, (unsigned long)__end_rodata,
+		(unsigned long)(__end_rodata - __start_rodata) >> 10,
 		(unsigned long)_sdata, (unsigned long)_edata,
 		(unsigned long)(_edata - _sdata) >> 10,
 		(unsigned long)__init_begin, (unsigned long)__init_end,

arch/xtensa/mm/kasan_init.c

@@ -20,7 +20,9 @@ void __init kasan_early_init(void)
 {
 	unsigned long vaddr = KASAN_SHADOW_START;
 	pgd_t *pgd = pgd_offset_k(vaddr);
-	pmd_t *pmd = pmd_offset(pgd, vaddr);
+	p4d_t *p4d = p4d_offset(pgd, vaddr);
+	pud_t *pud = pud_offset(p4d, vaddr);
+	pmd_t *pmd = pmd_offset(pud, vaddr);
 	int i;
 
 	for (i = 0; i < PTRS_PER_PTE; ++i)
@@ -42,7 +44,9 @@ static void __init populate(void *start, void *end)
 	unsigned long i, j;
 	unsigned long vaddr = (unsigned long)start;
 	pgd_t *pgd = pgd_offset_k(vaddr);
-	pmd_t *pmd = pmd_offset(pgd, vaddr);
+	p4d_t *p4d = p4d_offset(pgd, vaddr);
+	pud_t *pud = pud_offset(p4d, vaddr);
+	pmd_t *pmd = pmd_offset(pud, vaddr);
 	pte_t *pte = memblock_alloc(n_pages * sizeof(pte_t), PAGE_SIZE);
 
 	if (!pte)
@@ -56,7 +60,9 @@ static void __init populate(void *start, void *end)
 
 		for (k = 0; k < PTRS_PER_PTE; ++k, ++j) {
 			phys_addr_t phys =
-				memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE);
+				memblock_phys_alloc_range(PAGE_SIZE, PAGE_SIZE,
+							  0,
+							  MEMBLOCK_ALLOC_ANYWHERE);
 
 			if (!phys)
 				panic("Failed to allocate page table page\n");

arch/xtensa/mm/mmu.c

@@ -22,7 +22,9 @@
 static void * __init init_pmd(unsigned long vaddr, unsigned long n_pages)
 {
 	pgd_t *pgd = pgd_offset_k(vaddr);
-	pmd_t *pmd = pmd_offset(pgd, vaddr);
+	p4d_t *p4d = p4d_offset(pgd, vaddr);
+	pud_t *pud = pud_offset(p4d, vaddr);
+	pmd_t *pmd = pmd_offset(pud, vaddr);
 	pte_t *pte;
 	unsigned long i;
 

arch/xtensa/mm/tlb.c

@@ -169,6 +169,8 @@ static unsigned get_pte_for_vaddr(unsigned vaddr)
 	struct task_struct *task = get_current();
 	struct mm_struct *mm = task->mm;
 	pgd_t *pgd;
+	p4d_t *p4d;
+	pud_t *pud;
 	pmd_t *pmd;
 	pte_t *pte;
 
@@ -177,7 +179,13 @@ static unsigned get_pte_for_vaddr(unsigned vaddr)
 	pgd = pgd_offset(mm, vaddr);
 	if (pgd_none_or_clear_bad(pgd))
 		return 0;
-	pmd = pmd_offset(pgd, vaddr);
+	p4d = p4d_offset(pgd, vaddr);
+	if (p4d_none_or_clear_bad(p4d))
+		return 0;
+	pud = pud_offset(p4d, vaddr);
+	if (pud_none_or_clear_bad(pud))
+		return 0;
+	pmd = pmd_offset(pud, vaddr);
 	if (pmd_none_or_clear_bad(pmd))
 		return 0;
 	pte = pte_offset_map(pmd, vaddr);
@@ -216,6 +224,8 @@ static int check_tlb_entry(unsigned w, unsigned e, bool dtlb)
 	unsigned tlbidx = w | (e << PAGE_SHIFT);
 	unsigned r0 = dtlb ?
 		read_dtlb_virtual(tlbidx) : read_itlb_virtual(tlbidx);
+	unsigned r1 = dtlb ?
+		read_dtlb_translation(tlbidx) : read_itlb_translation(tlbidx);
 	unsigned vpn = (r0 & PAGE_MASK) | (e << PAGE_SHIFT);
 	unsigned pte = get_pte_for_vaddr(vpn);
 	unsigned mm_asid = (get_rasid_register() >> 8) & ASID_MASK;
@@ -231,8 +241,6 @@ static int check_tlb_entry(unsigned w, unsigned e, bool dtlb)
 	}
 
 	if (tlb_asid == mm_asid) {
-		unsigned r1 = dtlb ? read_dtlb_translation(tlbidx) :
-			read_itlb_translation(tlbidx);
 		if ((pte ^ r1) & PAGE_MASK) {
 			pr_err("%cTLB: way: %u, entry: %u, mapping: %08x->%08x, PTE: %08x\n",
 					dtlb ? 'D' : 'I', w, e, r0, r1, pte);