parisc architecture updates for kernel v5.16-rc1

Lots of new features and fixes:
 * Added TOC (table of content) support, which is a debugging feature which is
   either initiated by pressing the TOC button or via command in the BMC. If
   pressed the Linux built-in KDB/KGDB will be called (Sven Schnelle)
 * Fix CONFIG_PREEMPT (Sven)
 * Fix unwinder on 64-bit kernels (Sven)
 * Various kgdb fixes (Sven)
 * Added KFENCE support (me)
 * Switch to ARCH_STACKWALK implementation (me)
 * Fix ptrace check on syscall return (me)
 * Fix kernel crash with fixmaps on PA1.x machines (me)
 * Move thread_info into task struct, aka CONFIG_THREAD_INFO_IN_TASK (me)
 * Updated defconfigs
 * Smaller cleanups, including Makefile cleanups (Masahiro Yamada),
   use kthread_run() macro (Cai Huoqing), use swap() macro (Yihao Han).
 -----BEGIN PGP SIGNATURE-----
 
 iHUEABYIAB0WIQS86RI+GtKfB8BJu973ErUQojoPXwUCYYALowAKCRD3ErUQojoP
 X3o1APwK7wJBdFKAV2hMEouFNZLz2ZTkSQrCMhPTxRupkwJ71QD+JeXvyPLZBLIu
 hlvi9mw9DKUKgCV+/Z65s8zjSHYC4wg=
 =A4Ci
 -----END PGP SIGNATURE-----

Merge tag 'for-5.16/parisc-1' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux

Pull parisc updates from Helge Deller:
 "Lots of new features and fixes:

   - Added TOC (table of content) support, which is a debugging feature
     which is either initiated by pressing the TOC button or via command
     in the BMC. If pressed the Linux built-in KDB/KGDB will be called
     (Sven Schnelle)

   - Fix CONFIG_PREEMPT (Sven)

   - Fix unwinder on 64-bit kernels (Sven)

   - Various kgdb fixes (Sven)

   - Added KFENCE support (me)

   - Switch to ARCH_STACKWALK implementation (me)

   - Fix ptrace check on syscall return (me)

   - Fix kernel crash with fixmaps on PA1.x machines (me)

   - Move thread_info into task struct, aka CONFIG_THREAD_INFO_IN_TASK
     (me)

   - Updated defconfigs

   - Smaller cleanups, including Makefile cleanups (Masahiro Yamada),
     use kthread_run() macro (Cai Huoqing), use swap() macro (Yihao
     Han)"

* tag 'for-5.16/parisc-1' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux: (36 commits)
  parisc: Fix set_fixmap() on PA1.x CPUs
  parisc: Use swap() to swap values in setup_bootmem()
  parisc: Update defconfigs
  parisc: decompressor: clean up Makefile
  parisc: decompressor: remove repeated depenency of misc.o
  parisc: Remove unused constants from asm-offsets.c
  parisc/ftrace: use static key to enable/disable function graph tracer
  parisc/ftrace: set function trace function
  parisc: Make use of the helper macro kthread_run()
  parisc: mark xchg functions notrace
  parisc: enhance warning regarding usage of O_NONBLOCK
  parisc: Drop ifdef __KERNEL__ from non-uapi kernel headers
  parisc: Use PRIV_USER and PRIV_KERNEL in ptrace.h
  parisc: Use PRIV_USER in syscall.S
  parisc/kgdb: add kgdb_roundup() to make kgdb work with idle polling
  parisc: Move thread_info into task struct
  parisc: add support for TOC (transfer of control)
  parisc/firmware: add functions to retrieve TOC data
  parisc: add PIM TOC data structures
  parisc: move virt_map macro to assembly.h
  ...

Documentation/features/core/thread-info-in-task/arch-support.txt

@@ -20,7 +20,7 @@
     |       nds32: |  ok  |
     |       nios2: | TODO |
     |    openrisc: | TODO |
-    |      parisc: | TODO |
+    |      parisc: |  ok  |
     |     powerpc: |  ok  |
     |       riscv: |  ok  |
     |        s390: |  ok  |

arch/parisc/Kconfig

@@ -13,6 +13,8 @@ config PARISC
 	select ARCH_NO_SG_CHAIN
 	select ARCH_SUPPORTS_HUGETLBFS if PA20
 	select ARCH_SUPPORTS_MEMORY_FAILURE
+	select ARCH_STACKWALK
+	select HAVE_RELIABLE_STACKTRACE
 	select DMA_OPS
 	select RTC_CLASS
 	select RTC_DRV_GENERIC
@@ -46,6 +48,7 @@ config PARISC
 	select HAVE_ARCH_HASH
 	select HAVE_ARCH_JUMP_LABEL
 	select HAVE_ARCH_JUMP_LABEL_RELATIVE
+	select HAVE_ARCH_KFENCE
 	select HAVE_ARCH_SECCOMP_FILTER
 	select HAVE_ARCH_TRACEHOOK
 	select HAVE_REGS_AND_STACK_ACCESS_API
@@ -53,6 +56,7 @@ config PARISC
 	select HAVE_UNSTABLE_SCHED_CLOCK if SMP
 	select LEGACY_TIMER_TICK
 	select CPU_NO_EFFICIENT_FFS
+	select THREAD_INFO_IN_TASK
 	select NEED_DMA_MAP_STATE
 	select NEED_SG_DMA_LENGTH
 	select HAVE_ARCH_KGDB
@@ -252,11 +256,11 @@ config PARISC_PAGE_SIZE_4KB
 
 config PARISC_PAGE_SIZE_16KB
 	bool "16KB"
-	depends on PA8X00 && BROKEN
+	depends on PA8X00 && BROKEN && !KFENCE
 
 config PARISC_PAGE_SIZE_64KB
 	bool "64KB"
-	depends on PA8X00 && BROKEN
+	depends on PA8X00 && BROKEN && !KFENCE
 
 endchoice
 
@@ -288,6 +292,20 @@ config SMP
 
 	  If you don't know what to do here, say N.
 
+config TOC
+	bool "Support TOC switch"
+	default y if 64BIT || !SMP
+	help
+	  Most PA-RISC machines have either a switch at the back of the machine
+	  or a command in BMC to trigger a TOC interrupt. If you say Y here a
+	  handler will be installed which will either show a backtrace on all
+	  CPUs, or enter a possible configured debugger like kgdb/kdb.
+
+	  Note that with this option enabled, the kernel will use an additional 16KB
+	  per possible CPU as a special stack for the TOC handler.
+
+	  If you don't want to debug the Kernel, say N.
+
 config PARISC_CPU_TOPOLOGY
 	bool "Support cpu topology definition"
 	depends on SMP

arch/parisc/boot/compressed/Makefile

@@ -9,9 +9,10 @@ KCOV_INSTRUMENT := n
 GCOV_PROFILE := n
 UBSAN_SANITIZE := n
 
+OBJECTS := head.o real2.o firmware.o misc.o piggy.o
 targets := vmlinux.lds vmlinux vmlinux.bin vmlinux.bin.gz vmlinux.bin.bz2
 targets += vmlinux.bin.xz vmlinux.bin.lzma vmlinux.bin.lzo vmlinux.bin.lz4
-targets += misc.o piggy.o sizes.h head.o real2.o firmware.o
+targets += $(OBJECTS) sizes.h
 targets += real2.S firmware.c
 
 KBUILD_CFLAGS := -D__KERNEL__ -O2 -DBOOTLOADER
@@ -23,10 +24,8 @@ ifndef CONFIG_64BIT
 KBUILD_CFLAGS += -mfast-indirect-calls
 endif
 
-OBJECTS += $(obj)/head.o $(obj)/real2.o $(obj)/firmware.o $(obj)/misc.o $(obj)/piggy.o
-
 LDFLAGS_vmlinux := -X -e startup --as-needed -T
-$(obj)/vmlinux: $(obj)/vmlinux.lds $(OBJECTS) $(LIBGCC) FORCE
+$(obj)/vmlinux: $(obj)/vmlinux.lds $(addprefix $(obj)/, $(OBJECTS)) $(LIBGCC) FORCE
 	$(call if_changed,ld)
 
 sed-sizes := -e 's/^\([0-9a-fA-F]*\) . \(__bss_start\|_end\|parisc_kernel_start\)$$/\#define SZ\2 0x\1/p'
@@ -52,8 +51,6 @@ $(obj)/real2.o: $(obj)/real2.S
 $(obj)/real2.S: $(srctree)/arch/$(SRCARCH)/kernel/real2.S
 	$(call cmd,shipped)
 
-$(obj)/misc.o: $(obj)/sizes.h
-
 CPPFLAGS_vmlinux.lds += -I$(objtree)/$(obj) -DBOOTLOADER
 $(obj)/vmlinux.lds: $(obj)/sizes.h
 

arch/parisc/configs/generic-32bit_defconfig

@@ -22,7 +22,6 @@ CONFIG_PCI_LBA=y
 CONFIG_MODULES=y
 CONFIG_MODULE_UNLOAD=y
 CONFIG_MODULE_FORCE_UNLOAD=y
-# CONFIG_BLK_DEV_BSG is not set
 # CONFIG_CORE_DUMP_DEFAULT_ELF_HEADERS is not set
 CONFIG_BINFMT_MISC=m
 CONFIG_NET=y
@@ -55,13 +54,14 @@ CONFIG_BLK_DEV_SD=y
 CONFIG_CHR_DEV_ST=y
 CONFIG_BLK_DEV_SR=y
 CONFIG_CHR_DEV_SG=y
+# CONFIG_BLK_DEV_BSG is not set
 CONFIG_SCSI_LASI700=y
 CONFIG_SCSI_SYM53C8XX_2=y
 CONFIG_SCSI_ZALON=y
 CONFIG_SCSI_DH=y
 CONFIG_ATA=y
-CONFIG_ATA_GENERIC=y
 CONFIG_PATA_NS87415=y
+CONFIG_ATA_GENERIC=y
 CONFIG_MD=y
 CONFIG_BLK_DEV_MD=m
 CONFIG_MD_LINEAR=m
@@ -212,7 +212,6 @@ CONFIG_NFS_FS=m
 CONFIG_NFSD=m
 CONFIG_NFSD_V3=y
 CONFIG_CIFS=m
-CONFIG_CIFS_WEAK_PW_HASH=y
 CONFIG_CIFS_XATTR=y
 CONFIG_CIFS_POSIX=y
 # CONFIG_CIFS_DEBUG is not set
@@ -221,16 +220,12 @@ CONFIG_CRYPTO_HMAC=y
 CONFIG_CRYPTO_MD5=y
 CONFIG_CRYPTO_MICHAEL_MIC=m
 CONFIG_CRYPTO_SHA1=y
-CONFIG_CRYPTO_TGR192=m
 CONFIG_CRYPTO_WP512=m
-CONFIG_CRYPTO_ANUBIS=m
 CONFIG_CRYPTO_BLOWFISH=m
 CONFIG_CRYPTO_CAST5=m
 CONFIG_CRYPTO_CAST6=m
 CONFIG_CRYPTO_DES=y
-CONFIG_CRYPTO_KHAZAD=m
 CONFIG_CRYPTO_SERPENT=m
-CONFIG_CRYPTO_TEA=m
 CONFIG_CRYPTO_TWOFISH=m
 CONFIG_CRYPTO_DEFLATE=y
 CONFIG_CRC_CCITT=m

arch/parisc/configs/generic-64bit_defconfig

@@ -8,9 +8,10 @@ CONFIG_TASKSTATS=y
 CONFIG_TASK_DELAY_ACCT=y
 CONFIG_TASK_XACCT=y
 CONFIG_TASK_IO_ACCOUNTING=y
+CONFIG_IKCONFIG=y
+CONFIG_IKCONFIG_PROC=y
 CONFIG_CGROUPS=y
 CONFIG_MEMCG=y
-CONFIG_MEMCG_SWAP=y
 CONFIG_CGROUP_PIDS=y
 CONFIG_CPUSETS=y
 CONFIG_RELAY=y
@@ -124,14 +125,13 @@ CONFIG_QLCNIC=m
 # CONFIG_NET_VENDOR_TI is not set
 # CONFIG_NET_VENDOR_VIA is not set
 # CONFIG_NET_VENDOR_WIZNET is not set
-CONFIG_MDIO_BITBANG=m
 CONFIG_PHYLIB=y
 CONFIG_BROADCOM_PHY=m
 CONFIG_CICADA_PHY=m
 CONFIG_DAVICOM_PHY=m
 CONFIG_ICPLUS_PHY=m
-CONFIG_LSI_ET1011C_PHY=m
 CONFIG_LXT_PHY=m
+CONFIG_LSI_ET1011C_PHY=m
 CONFIG_MARVELL_PHY=m
 CONFIG_NATIONAL_PHY=m
 CONFIG_QSEMI_PHY=m
@@ -139,6 +139,7 @@ CONFIG_REALTEK_PHY=m
 CONFIG_SMSC_PHY=m
 CONFIG_STE10XP=m
 CONFIG_VITESSE_PHY=m
+CONFIG_MDIO_BITBANG=m
 CONFIG_SLIP=m
 # CONFIG_WLAN is not set
 CONFIG_INPUT_EVDEV=y
@@ -150,7 +151,6 @@ CONFIG_SERIO_SERPORT=m
 # CONFIG_HP_SDC is not set
 CONFIG_SERIO_RAW=m
 # CONFIG_LEGACY_PTYS is not set
-CONFIG_NOZOMI=m
 CONFIG_SERIAL_8250=y
 # CONFIG_SERIAL_8250_DEPRECATED_OPTIONS is not set
 CONFIG_SERIAL_8250_CONSOLE=y
@@ -160,6 +160,7 @@ CONFIG_SERIAL_8250_EXTENDED=y
 CONFIG_SERIAL_8250_MANY_PORTS=y
 CONFIG_SERIAL_8250_SHARE_IRQ=y
 CONFIG_SERIAL_JSM=m
+CONFIG_NOZOMI=m
 CONFIG_IPMI_HANDLER=y
 CONFIG_IPMI_DEVICE_INTERFACE=y
 CONFIG_IPMI_SI=y
@@ -188,9 +189,13 @@ CONFIG_AGP=y
 CONFIG_AGP_PARISC=y
 CONFIG_DRM=y
 CONFIG_DRM_RADEON=y
-CONFIG_FIRMWARE_EDID=y
+CONFIG_FB=y
-CONFIG_FB_MODE_HELPERS=y
+CONFIG_FB_MATROX=y
-CONFIG_FRAMEBUFFER_CONSOLE_ROTATION=y
+CONFIG_FB_MATROX_MYSTIQUE=y
+CONFIG_FB_MATROX_G=y
+CONFIG_FB_MATROX_I2C=y
+CONFIG_FB_MATROX_MAVEN=y
+CONFIG_FB_RADEON=y
 CONFIG_HIDRAW=y
 CONFIG_HID_PID=y
 CONFIG_USB_HIDDEV=y
@@ -202,7 +207,6 @@ CONFIG_UIO_SERCOS3=m
 CONFIG_UIO_PCI_GENERIC=m
 CONFIG_STAGING=y
 CONFIG_QLGE=m
-CONFIG_HP100=m
 CONFIG_EXT2_FS=y
 CONFIG_EXT2_FS_XATTR=y
 CONFIG_EXT2_FS_SECURITY=y
@@ -245,7 +249,6 @@ CONFIG_CRYPTO_PCBC=m
 CONFIG_CRYPTO_MD4=m
 CONFIG_CRYPTO_MD5=y
 CONFIG_CRYPTO_MICHAEL_MIC=m
-CONFIG_CRYPTO_ARC4=m
 CONFIG_CRYPTO_FCRYPT=m
 CONFIG_CRYPTO_DEFLATE=m
 # CONFIG_CRYPTO_HW is not set

arch/parisc/include/asm/assembly.h

@@ -42,6 +42,9 @@
 #define ASM_ULONG_INSN	.word
 #endif
 
+/* Frame alignment for 32- and 64-bit */
+#define FRAME_ALIGN     64
+
 #define CALLEE_SAVE_FRAME_SIZE (CALLEE_REG_FRAME_SIZE + CALLEE_FLOAT_FRAME_SIZE)
 
 #ifdef CONFIG_PA20
@@ -58,6 +61,10 @@
 #define PA_ASM_LEVEL	1.1
 #endif
 
+/* Privilege level field in the rightmost two bits of the IA queues */
+#define PRIV_USER	3
+#define PRIV_KERNEL	0
+
 #ifdef __ASSEMBLY__
 
 #ifdef CONFIG_64BIT
@@ -71,6 +78,7 @@
 #include <asm/types.h>
 
 #include <asm/asmregs.h>
+#include <asm/psw.h>
 
 	sp	=	30
 	gp	=	27
@@ -497,6 +505,30 @@
 	nop	/* 7 */
 	.endm
 
+	/* Switch to virtual mapping, trashing only %r1 */
+	.macro  virt_map
+	/* pcxt_ssm_bug */
+	rsm	PSW_SM_I, %r0		/* barrier for "Relied upon Translation */
+	mtsp	%r0, %sr4
+	mtsp	%r0, %sr5
+	mtsp	%r0, %sr6
+	tovirt_r1 %r29
+	load32	KERNEL_PSW, %r1
+
+	rsm     PSW_SM_QUIET,%r0	/* second "heavy weight" ctl op */
+	mtctl	%r0, %cr17		/* Clear IIASQ tail */
+	mtctl	%r0, %cr17		/* Clear IIASQ head */
+	mtctl	%r1, %ipsw
+	load32	4f, %r1
+	mtctl	%r1, %cr18		/* Set IIAOQ tail */
+	ldo	4(%r1), %r1
+	mtctl	%r1, %cr18		/* Set IIAOQ head */
+	rfir
+	nop
+4:
+	.endm
+
+
 	/*
 	 * ASM_EXCEPTIONTABLE_ENTRY
 	 *

arch/parisc/include/asm/bitops.h

@@ -104,8 +104,6 @@ static __inline__ int test_and_change_bit(int nr, volatile unsigned long * addr)
 
 #include <asm-generic/bitops/non-atomic.h>
 
-#ifdef __KERNEL__
-
 /**
  * __ffs - find first bit in word. returns 0 to "BITS_PER_LONG-1".
  * @word: The word to search
@@ -205,16 +203,8 @@ static __inline__ int fls(unsigned int x)
 #include <asm-generic/bitops/hweight.h>
 #include <asm-generic/bitops/lock.h>
 #include <asm-generic/bitops/sched.h>
-
-#endif /* __KERNEL__ */
-
 #include <asm-generic/bitops/find.h>
-
-#ifdef __KERNEL__
-
 #include <asm-generic/bitops/le.h>
 #include <asm-generic/bitops/ext2-atomic-setbit.h>
 
-#endif	/* __KERNEL__ */
-
 #endif /* _PARISC_BITOPS_H */

arch/parisc/include/asm/current.h

@@ -0,0 +1,19 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _ASM_PARISC_CURRENT_H
+#define _ASM_PARISC_CURRENT_H
+
+#include <asm/special_insns.h>
+
+#ifndef __ASSEMBLY__
+struct task_struct;
+
+static __always_inline struct task_struct *get_current(void)
+{
+	return (struct task_struct *) mfctl(30);
+}
+
+#define current get_current()
+
+#endif /* __ASSEMBLY__ */
+
+#endif /* _ASM_PARISC_CURRENT_H */

arch/parisc/include/asm/futex.h

@@ -2,8 +2,6 @@
 #ifndef _ASM_PARISC_FUTEX_H
 #define _ASM_PARISC_FUTEX_H
 
-#ifdef __KERNEL__
-
 #include <linux/futex.h>
 #include <linux/uaccess.h>
 #include <asm/atomic.h>
@@ -119,5 +117,4 @@ futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr,
 	return 0;
 }
 
-#endif /*__KERNEL__*/
 #endif /*_ASM_PARISC_FUTEX_H*/

arch/parisc/include/asm/ide.h

@@ -12,8 +12,6 @@
 #ifndef __ASM_PARISC_IDE_H
 #define __ASM_PARISC_IDE_H
 
-#ifdef __KERNEL__
-
 /* Generic I/O and MEMIO string operations.  */
 
 #define __ide_insw	insw
@@ -53,6 +51,4 @@ static __inline__ void __ide_mm_outsl(void __iomem *port, void *addr, u32 count)
 	}
 }
 
-#endif /* __KERNEL__ */
-
 #endif /* __ASM_PARISC_IDE_H */

arch/parisc/include/asm/kfence.h

@@ -0,0 +1,44 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * PA-RISC KFENCE support.
+ *
+ * Copyright (C) 2021, Helge Deller <deller@gmx.de>
+ */
+
+#ifndef _ASM_PARISC_KFENCE_H
+#define _ASM_PARISC_KFENCE_H
+
+#include <linux/kfence.h>
+
+#include <asm/pgtable.h>
+#include <asm/tlbflush.h>
+
+static inline bool arch_kfence_init_pool(void)
+{
+	return true;
+}
+
+/* Protect the given page and flush TLB. */
+static inline bool kfence_protect_page(unsigned long addr, bool protect)
+{
+	pte_t *pte = virt_to_kpte(addr);
+
+	if (WARN_ON(!pte))
+		return false;
+
+	/*
+	 * We need to avoid IPIs, as we may get KFENCE allocations or faults
+	 * with interrupts disabled.
+	 */
+
+	if (protect)
+		set_pte(pte, __pte(pte_val(*pte) & ~_PAGE_PRESENT));
+	else
+		set_pte(pte, __pte(pte_val(*pte) | _PAGE_PRESENT));
+
+	flush_tlb_kernel_range(addr, addr + PAGE_SIZE);
+
+	return true;
+}
+
+#endif /* _ASM_PARISC_KFENCE_H */

arch/parisc/include/asm/mckinley.h

@@ -1,10 +1,8 @@
 /* SPDX-License-Identifier: GPL-2.0 */
 #ifndef ASM_PARISC_MCKINLEY_H
 #define ASM_PARISC_MCKINLEY_H
-#ifdef __KERNEL__
 
 /* declared in arch/parisc/kernel/setup.c */
 extern struct proc_dir_entry * proc_mckinley_root;
 
-#endif /*__KERNEL__*/
 #endif /*ASM_PARISC_MCKINLEY_H*/

arch/parisc/include/asm/pdc.h

@@ -51,6 +51,8 @@ int pdc_spaceid_bits(unsigned long *space_bits);
 int pdc_btlb_info(struct pdc_btlb_info *btlb);
 int pdc_mem_map_hpa(struct pdc_memory_map *r_addr, struct pdc_module_path *mod_path);
 #endif /* !CONFIG_PA20 */
+int pdc_pim_toc11(struct pdc_toc_pim_11 *ret);
+int pdc_pim_toc20(struct pdc_toc_pim_20 *ret);
 int pdc_lan_station_id(char *lan_addr, unsigned long net_hpa);
 
 int pdc_stable_read(unsigned long staddr, void *memaddr, unsigned long count);

arch/parisc/include/asm/processor.h

@@ -12,6 +12,7 @@
 #ifndef __ASSEMBLY__
 #include <linux/threads.h>
 
+#include <asm/assembly.h>
 #include <asm/prefetch.h>
 #include <asm/hardware.h>
 #include <asm/pdc.h>
@@ -37,16 +38,12 @@
 #define DEFAULT_MAP_BASE	DEFAULT_MAP_BASE32
 #endif
 
-#ifdef __KERNEL__
-
 /* XXX: STACK_TOP actually should be STACK_BOTTOM for parisc.
  * prumpf */
 
 #define STACK_TOP	TASK_SIZE
 #define STACK_TOP_MAX	DEFAULT_TASK_SIZE
 
-#endif
-
 #ifndef __ASSEMBLY__
 
 unsigned long calc_max_stack_size(unsigned long stack_max);
@@ -101,8 +98,6 @@ DECLARE_PER_CPU(struct cpuinfo_parisc, cpu_data);
 
 #define CPU_HVERSION ((boot_cpu_data.hversion >> 4) & 0x0FFF)
 
-#define ARCH_MIN_TASKALIGN	8
-
 struct thread_struct {
 	struct pt_regs regs;
 	unsigned long  task_size;
@@ -294,6 +289,10 @@ extern int _parisc_requires_coherency;
 
 extern int running_on_qemu;
 
+extern void toc_handler(void);
+extern unsigned int toc_handler_size;
+extern unsigned int toc_handler_csum;
+
 #endif /* __ASSEMBLY__ */
 
 #endif /* __ASM_PARISC_PROCESSOR_H */

arch/parisc/include/asm/ptrace.h

@@ -5,17 +5,17 @@
 #ifndef _PARISC_PTRACE_H
 #define _PARISC_PTRACE_H
 
+#include <asm/assembly.h>
 #include <uapi/asm/ptrace.h>
 
-
 #define task_regs(task) ((struct pt_regs *) ((char *)(task) + TASK_REGS))
 
 #define arch_has_single_step()	1
 #define arch_has_block_step()	1
 
 /* XXX should we use iaoq[1] or iaoq[0] ? */
-#define user_mode(regs)			(((regs)->iaoq[0] & 3) ? 1 : 0)
+#define user_mode(regs)			(((regs)->iaoq[0] & 3) != PRIV_KERNEL)
-#define user_space(regs)		(((regs)->iasq[1] != 0) ? 1 : 0)
+#define user_space(regs)		((regs)->iasq[1] != PRIV_KERNEL)
 #define instruction_pointer(regs)	((regs)->iaoq[0] & ~3)
 #define user_stack_pointer(regs)	((regs)->gr[30])
 unsigned long profile_pc(struct pt_regs *);

arch/parisc/include/asm/runway.h

@@ -1,7 +1,6 @@
 /* SPDX-License-Identifier: GPL-2.0 */
 #ifndef ASM_PARISC_RUNWAY_H
 #define ASM_PARISC_RUNWAY_H
-#ifdef __KERNEL__
 
 /* declared in arch/parisc/kernel/setup.c */
 extern struct proc_dir_entry * proc_runway_root;
@@ -9,5 +8,4 @@ extern struct proc_dir_entry * proc_runway_root;
 #define RUNWAY_STATUS	0x10
 #define RUNWAY_DEBUG	0x40
 
-#endif /* __KERNEL__ */
 #endif /* ASM_PARISC_RUNWAY_H */

arch/parisc/include/asm/smp.h

@@ -34,8 +34,23 @@ extern void arch_send_call_function_ipi_mask(const struct cpumask *mask);
 
 #endif /* !ASSEMBLY */
 
-#define raw_smp_processor_id()	(current_thread_info()->cpu)
+/*
-
+ * This is particularly ugly: it appears we can't actually get the definition
+ * of task_struct here, but we need access to the CPU this task is running on.
+ * Instead of using task_struct we're using TASK_CPU which is extracted from
+ * asm-offsets.h by kbuild to get the current processor ID.
+ *
+ * This also needs to be safeguarded when building asm-offsets.s because at
+ * that time TASK_CPU is not defined yet. It could have been guarded by
+ * TASK_CPU itself, but we want the build to fail if TASK_CPU is missing
+ * when building something else than asm-offsets.s
+ */
+#ifdef GENERATING_ASM_OFFSETS
+#define raw_smp_processor_id()		(0)
+#else
+#include <asm/asm-offsets.h>
+#define raw_smp_processor_id()		(*(unsigned int *)((void *)current + TASK_CPU))
+#endif
 #else /* CONFIG_SMP */
 
 static inline void smp_send_all_nop(void) { return; }

arch/parisc/include/asm/thread_info.h

@@ -2,30 +2,21 @@
 #ifndef _ASM_PARISC_THREAD_INFO_H
 #define _ASM_PARISC_THREAD_INFO_H
 
-#ifdef __KERNEL__
-
 #ifndef __ASSEMBLY__
 #include <asm/processor.h>
 #include <asm/special_insns.h>
 
 struct thread_info {
-	struct task_struct *task;	/* main task structure */
 	unsigned long flags;		/* thread_info flags (see TIF_*) */
-	__u32 cpu;			/* current CPU */
 	int preempt_count;		/* 0=premptable, <0=BUG; will also serve as bh-counter */
 };
 
 #define INIT_THREAD_INFO(tsk)			\
 {						\
-	.task		= &tsk,			\
 	.flags		= 0,			\
-	.cpu		= 0,			\
 	.preempt_count	= INIT_PREEMPT_COUNT,	\
 }
 
-/* how to get the thread information struct from C */
-#define current_thread_info()	((struct thread_info *)mfctl(30))
-
 #endif /* !__ASSEMBLY */
 
 /* thread information allocation */
@@ -57,6 +48,7 @@ struct thread_info {
 #define TIF_BLOCKSTEP		10	/* branch stepping? */
 #define TIF_SECCOMP		11	/* secure computing */
 #define TIF_SYSCALL_TRACEPOINT	12	/* syscall tracepoint instrumentation */
+#define TIF_NONBLOCK_WARNING	13	/* warned about wrong O_NONBLOCK usage */
 
 #define _TIF_SYSCALL_TRACE	(1 << TIF_SYSCALL_TRACE)
 #define _TIF_SIGPENDING		(1 << TIF_SIGPENDING)
@@ -87,6 +79,4 @@ struct thread_info {
 # define is_32bit_task()	(1)
 #endif
 
-#endif /* __KERNEL__ */
-
 #endif /* _ASM_PARISC_THREAD_INFO_H */

arch/parisc/include/asm/traps.h

@@ -14,6 +14,7 @@ void parisc_terminate(char *msg, struct pt_regs *regs,
 void die_if_kernel(char *str, struct pt_regs *regs, long err);
 
 /* mm/fault.c */
+unsigned long parisc_acctyp(unsigned long code, unsigned int inst);
 const char *trap_name(unsigned long code);
 void do_page_fault(struct pt_regs *regs, unsigned long code,
 		unsigned long address);

arch/parisc/include/asm/unaligned.h

@@ -4,10 +4,8 @@
 
 #include <asm-generic/unaligned.h>
 
-#ifdef __KERNEL__
 struct pt_regs;
 void handle_unaligned(struct pt_regs *regs);
 int check_unaligned(struct pt_regs *regs);
-#endif
 
 #endif /* _ASM_PARISC_UNALIGNED_H */

arch/parisc/include/uapi/asm/pdc.h

@@ -398,8 +398,10 @@ struct zeropage {
 	/* int	(*vec_rendz)(void); */
 	unsigned int vec_rendz;
 	int	vec_pow_fail_flen;
-	int	vec_pad[10];		
+	int	vec_pad0[3];
-	
+	unsigned int vec_toc_hi;
+	int	vec_pad1[6];
+
 	/* [0x040] reserved processor dependent */
 	int	pad0[112];
 
@@ -689,6 +691,28 @@ struct pdc_hpmc_pim_20 { /* PDC_PIM */
 	unsigned long long fr[32];
 };
 
+struct pdc_toc_pim_11 {
+	unsigned int gr[32];
+	unsigned int cr[32];
+	unsigned int sr[8];
+	unsigned int iasq_back;
+	unsigned int iaoq_back;
+	unsigned int check_type;
+	unsigned int hversion;
+	unsigned int cpu_state;
+};
+
+struct pdc_toc_pim_20 {
+	unsigned long long gr[32];
+	unsigned long long cr[32];
+	unsigned long long sr[8];
+	unsigned long long iasq_back;
+	unsigned long long iaoq_back;
+	unsigned int check_type;
+	unsigned int hversion;
+	unsigned int cpu_state;
+};
+
 #endif /* !defined(__ASSEMBLY__) */
 
 #endif /* _UAPI_PARISC_PDC_H */

arch/parisc/kernel/Makefile

@@ -39,3 +39,4 @@ obj-$(CONFIG_KGDB)			+= kgdb.o
 obj-$(CONFIG_KPROBES)			+= kprobes.o
 obj-$(CONFIG_KEXEC_CORE)		+= kexec.o relocate_kernel.o
 obj-$(CONFIG_KEXEC_FILE)		+= kexec_file.o
+obj-$(CONFIG_TOC)			+= toc.o toc_asm.o

arch/parisc/kernel/asm-offsets.c

@@ -14,6 +14,8 @@
  *    Copyright (C) 2003 James Bottomley <jejb at parisc-linux.org>
  */
 
+#define GENERATING_ASM_OFFSETS /* asm/smp.h */
+
 #include <linux/types.h>
 #include <linux/sched.h>
 #include <linux/thread_info.h>
@@ -22,18 +24,12 @@
 #include <linux/kbuild.h>
 #include <linux/pgtable.h>
 
+#include <asm/assembly.h>
 #include <asm/ptrace.h>
 #include <asm/processor.h>
 #include <asm/pdc.h>
 #include <linux/uaccess.h>
 
-#ifdef CONFIG_64BIT
-#define FRAME_SIZE	128
-#else
-#define FRAME_SIZE	64
-#endif
-#define FRAME_ALIGN	64
-
 /* Add FRAME_SIZE to the size x and align it to y. All definitions
  * that use align_frame will include space for a frame.
  */
@@ -41,13 +37,11 @@
 
 int main(void)
 {
-	DEFINE(TASK_THREAD_INFO, offsetof(struct task_struct, stack));
+	DEFINE(TASK_TI_FLAGS, offsetof(struct task_struct, thread_info.flags));
-	DEFINE(TASK_FLAGS, offsetof(struct task_struct, flags));
+	DEFINE(TASK_STACK, offsetof(struct task_struct, stack));
-	DEFINE(TASK_SIGPENDING, offsetof(struct task_struct, pending));
+#ifdef CONFIG_SMP
-	DEFINE(TASK_PTRACE, offsetof(struct task_struct, ptrace));
+	DEFINE(TASK_CPU, offsetof(struct task_struct, cpu));
-	DEFINE(TASK_MM, offsetof(struct task_struct, mm));
+#endif
-	DEFINE(TASK_PERSONALITY, offsetof(struct task_struct, personality));
-	DEFINE(TASK_PID, offsetof(struct task_struct, pid));
 	BLANK();
 	DEFINE(TASK_REGS, offsetof(struct task_struct, thread.regs));
 	DEFINE(TASK_PT_PSW, offsetof(struct task_struct, thread.regs.gr[ 0]));
@@ -135,10 +129,6 @@ int main(void)
 	DEFINE(TASK_PT_ISR, offsetof(struct task_struct, thread.regs.isr));
 	DEFINE(TASK_PT_IOR, offsetof(struct task_struct, thread.regs.ior));
 	BLANK();
-	DEFINE(TASK_SZ, sizeof(struct task_struct));
-	/* TASK_SZ_ALGN includes space for a stack frame. */
-	DEFINE(TASK_SZ_ALGN, align_frame(sizeof(struct task_struct), FRAME_ALIGN));
-	BLANK();
 	DEFINE(PT_PSW, offsetof(struct pt_regs, gr[ 0]));
 	DEFINE(PT_GR1, offsetof(struct pt_regs, gr[ 1]));
 	DEFINE(PT_GR2, offsetof(struct pt_regs, gr[ 2]));
@@ -223,17 +213,11 @@ int main(void)
 	DEFINE(PT_IIR, offsetof(struct pt_regs, iir));
 	DEFINE(PT_ISR, offsetof(struct pt_regs, isr));
 	DEFINE(PT_IOR, offsetof(struct pt_regs, ior));
-	DEFINE(PT_SIZE, sizeof(struct pt_regs));
 	/* PT_SZ_ALGN includes space for a stack frame. */
 	DEFINE(PT_SZ_ALGN, align_frame(sizeof(struct pt_regs), FRAME_ALIGN));
 	BLANK();
-	DEFINE(TI_TASK, offsetof(struct thread_info, task));
 	DEFINE(TI_FLAGS, offsetof(struct thread_info, flags));
-	DEFINE(TI_CPU, offsetof(struct thread_info, cpu));
+	DEFINE(TI_PRE_COUNT, offsetof(struct task_struct, thread_info.preempt_count));
-	DEFINE(TI_PRE_COUNT, offsetof(struct thread_info, preempt_count));
-	DEFINE(THREAD_SZ, sizeof(struct thread_info));
-	/* THREAD_SZ_ALGN includes space for a stack frame. */
-	DEFINE(THREAD_SZ_ALGN, align_frame(sizeof(struct thread_info), FRAME_ALIGN));
 	BLANK();
 	DEFINE(ICACHE_BASE, offsetof(struct pdc_cache_info, ic_base));
 	DEFINE(ICACHE_STRIDE, offsetof(struct pdc_cache_info, ic_stride));

arch/parisc/kernel/cache.c

@@ -543,10 +543,33 @@ static inline pte_t *get_ptep(pgd_t *pgd, unsigned long addr)
 	return ptep;
 }
 
+static void flush_cache_pages(struct vm_area_struct *vma, struct mm_struct *mm,
+			      unsigned long start, unsigned long end)
+{
+	unsigned long addr, pfn;
+	pte_t *ptep;
+
+	for (addr = start; addr < end; addr += PAGE_SIZE) {
+		ptep = get_ptep(mm->pgd, addr);
+		if (ptep) {
+			pfn = pte_pfn(*ptep);
+			flush_cache_page(vma, addr, pfn);
+		}
+	}
+}
+
+static void flush_user_cache_tlb(struct vm_area_struct *vma,
+				 unsigned long start, unsigned long end)
+{
+	flush_user_dcache_range_asm(start, end);
+	if (vma->vm_flags & VM_EXEC)
+		flush_user_icache_range_asm(start, end);
+	flush_tlb_range(vma, start, end);
+}
+
 void flush_cache_mm(struct mm_struct *mm)
 {
 	struct vm_area_struct *vma;
-	pgd_t *pgd;
 
 	/* Flushing the whole cache on each cpu takes forever on
 	   rp3440, etc.  So, avoid it if the mm isn't too big.  */
@@ -558,45 +581,22 @@ void flush_cache_mm(struct mm_struct *mm)
 		return;
 	}
 
+	preempt_disable();
 	if (mm->context == mfsp(3)) {
-		for (vma = mm->mmap; vma; vma = vma->vm_next) {
+		for (vma = mm->mmap; vma; vma = vma->vm_next)
-			flush_user_dcache_range_asm(vma->vm_start, vma->vm_end);
+			flush_user_cache_tlb(vma, vma->vm_start, vma->vm_end);
-			if (vma->vm_flags & VM_EXEC)
+		preempt_enable();
-				flush_user_icache_range_asm(vma->vm_start, vma->vm_end);
-			flush_tlb_range(vma, vma->vm_start, vma->vm_end);
-		}
 		return;
 	}
 
-	pgd = mm->pgd;
+	for (vma = mm->mmap; vma; vma = vma->vm_next)
-	for (vma = mm->mmap; vma; vma = vma->vm_next) {
+		flush_cache_pages(vma, mm, vma->vm_start, vma->vm_end);
-		unsigned long addr;
+	preempt_enable();
-
-		for (addr = vma->vm_start; addr < vma->vm_end;
-		     addr += PAGE_SIZE) {
-			unsigned long pfn;
-			pte_t *ptep = get_ptep(pgd, addr);
-			if (!ptep)
-				continue;
-			pfn = pte_pfn(*ptep);
-			if (!pfn_valid(pfn))
-				continue;
-			if (unlikely(mm->context)) {
-				flush_tlb_page(vma, addr);
-				__flush_cache_page(vma, addr, PFN_PHYS(pfn));
-			} else {
-				__purge_cache_page(vma, addr, PFN_PHYS(pfn));
-			}
-		}
-	}
 }
 
 void flush_cache_range(struct vm_area_struct *vma,
 		unsigned long start, unsigned long end)
 {
-	pgd_t *pgd;
-	unsigned long addr;
-
 	if ((!IS_ENABLED(CONFIG_SMP) || !arch_irqs_disabled()) &&
 	    end - start >= parisc_cache_flush_threshold) {
 		if (vma->vm_mm->context)
@@ -605,30 +605,15 @@ void flush_cache_range(struct vm_area_struct *vma,
 		return;
 	}
 
+	preempt_disable();
 	if (vma->vm_mm->context == mfsp(3)) {
-		flush_user_dcache_range_asm(start, end);
+		flush_user_cache_tlb(vma, start, end);
-		if (vma->vm_flags & VM_EXEC)
+		preempt_enable();
-			flush_user_icache_range_asm(start, end);
-		flush_tlb_range(vma, start, end);
 		return;
 	}
 
-	pgd = vma->vm_mm->pgd;
+	flush_cache_pages(vma, vma->vm_mm, vma->vm_start, vma->vm_end);
-	for (addr = vma->vm_start; addr < vma->vm_end; addr += PAGE_SIZE) {
+	preempt_enable();
-		unsigned long pfn;
-		pte_t *ptep = get_ptep(pgd, addr);
-		if (!ptep)
-			continue;
-		pfn = pte_pfn(*ptep);
-		if (pfn_valid(pfn)) {
-			if (unlikely(vma->vm_mm->context)) {
-				flush_tlb_page(vma, addr);
-				__flush_cache_page(vma, addr, PFN_PHYS(pfn));
-			} else {
-				__purge_cache_page(vma, addr, PFN_PHYS(pfn));
-			}
-		}
-	}
 }
 
 void

arch/parisc/kernel/entry.S

@@ -51,30 +51,6 @@
 	extrd,u \spc,(64 - (SPACEID_SHIFT)),32,\prot
 	.endm
 #endif
-
-	/* Switch to virtual mapping, trashing only %r1 */
-	.macro  virt_map
-	/* pcxt_ssm_bug */
-	rsm	PSW_SM_I, %r0	/* barrier for "Relied upon Translation */
-	mtsp	%r0, %sr4
-	mtsp	%r0, %sr5
-	mtsp	%r0, %sr6
-	tovirt_r1 %r29
-	load32	KERNEL_PSW, %r1
-
-	rsm     PSW_SM_QUIET,%r0	/* second "heavy weight" ctl op */
-	mtctl	%r0, %cr17	/* Clear IIASQ tail */
-	mtctl	%r0, %cr17	/* Clear IIASQ head */
-	mtctl	%r1, %ipsw
-	load32	4f, %r1
-	mtctl	%r1, %cr18	/* Set IIAOQ tail */
-	ldo	4(%r1), %r1
-	mtctl	%r1, %cr18	/* Set IIAOQ head */
-	rfir
-	nop
-4:
-	.endm
-
 	/*
 	 * The "get_stack" macros are responsible for determining the
 	 * kernel stack value.
@@ -87,8 +63,8 @@
 	 *          Need to set up a kernel stack, so call the
 	 *          get_stack_use_cr30 macro to set up a pointer
 	 *          to the pt_regs structure contained within the
-	 *          task pointer pointed to by cr30. Set the stack
+	 *          task pointer pointed to by cr30. Load the stack
-	 *          pointer to point to the end of the task structure.
+	 *          pointer from the task structure.
 	 *
 	 * Note that we use shadowed registers for temps until
 	 * we can save %r26 and %r29. %r26 is used to preserve
@@ -100,8 +76,6 @@
 	 * or handle_interruption. %r29 is used to hold a pointer
 	 * the register save area, and once again, it needs to
 	 * be a non-shadowed register so that it survives the rfir.
-	 *
-	 * N.B. TASK_SZ_ALGN and PT_SZ_ALGN include space for a stack frame.
 	 */
 
 	.macro  get_stack_use_cr30
@@ -110,12 +84,11 @@
 
 	copy	%r30, %r17
 	mfctl   %cr30, %r1
-	ldo	THREAD_SZ_ALGN(%r1), %r30
+	tophys  %r1,%r9		/* task_struct */
-	mtsp	%r0,%sr7
+	LDREG	TASK_STACK(%r9),%r30
+	ldo	PT_SZ_ALGN(%r30),%r30
+	mtsp	%r0,%sr7	/* clear sr7 after kernel stack was set! */
 	mtsp	%r16,%sr3
-	tophys  %r1,%r9
-	LDREG	TI_TASK(%r9), %r1	/* thread_info -> task_struct */
-	tophys  %r1,%r9
 	ldo     TASK_REGS(%r9),%r9
 	STREG   %r17,PT_GR30(%r9)
 	STREG   %r29,PT_GR29(%r9)
@@ -757,7 +730,7 @@ ENTRY(ret_from_kernel_thread)
 	BL	schedule_tail, %r2
 	nop
 
-	LDREG	TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30), %r1
+	mfctl	%cr30,%r1	/* task_struct */
 	LDREG	TASK_PT_GR25(%r1), %r26
 #ifdef CONFIG_64BIT
 	LDREG	TASK_PT_GR27(%r1), %r27
@@ -788,7 +761,6 @@ ENTRY_CFI(_switch_to)
 
 	STREG	%r30, TASK_PT_KSP(%r26)
 	LDREG	TASK_PT_KSP(%r25), %r30
-	LDREG	TASK_THREAD_INFO(%r25), %r25
 	bv	%r0(%r2)
 	mtctl   %r25,%cr30
 
@@ -819,17 +791,16 @@ ENDPROC_CFI(_switch_to)
 	.align	PAGE_SIZE
 
 ENTRY_CFI(syscall_exit_rfi)
-	mfctl   %cr30,%r16
+	mfctl	%cr30,%r16		/* task_struct */
-	LDREG	TI_TASK(%r16), %r16	/* thread_info -> task_struct */
 	ldo	TASK_REGS(%r16),%r16
 	/* Force iaoq to userspace, as the user has had access to our current
 	 * context via sigcontext. Also Filter the PSW for the same reason.
 	 */
 	LDREG	PT_IAOQ0(%r16),%r19
-	depi	3,31,2,%r19
+	depi	PRIV_USER,31,2,%r19
 	STREG	%r19,PT_IAOQ0(%r16)
 	LDREG	PT_IAOQ1(%r16),%r19
-	depi	3,31,2,%r19
+	depi	PRIV_USER,31,2,%r19
 	STREG	%r19,PT_IAOQ1(%r16)
 	LDREG   PT_PSW(%r16),%r19
 	load32	USER_PSW_MASK,%r1
@@ -865,14 +836,14 @@ ENTRY_CFI(syscall_exit_rfi)
 ENTRY(intr_return)
 	/* check for reschedule */
 	mfctl   %cr30,%r1
-	LDREG   TI_FLAGS(%r1),%r19	/* sched.h: TIF_NEED_RESCHED */
+	LDREG   TASK_TI_FLAGS(%r1),%r19	/* sched.h: TIF_NEED_RESCHED */
 	bb,<,n	%r19,31-TIF_NEED_RESCHED,intr_do_resched /* forward */
 
 	.import do_notify_resume,code
 intr_check_sig:
 	/* As above */
 	mfctl   %cr30,%r1
-	LDREG	TI_FLAGS(%r1),%r19
+	LDREG	TASK_TI_FLAGS(%r1),%r19
 	ldi	(_TIF_USER_WORK_MASK & ~_TIF_NEED_RESCHED), %r20
 	and,COND(<>)	%r19, %r20, %r0
 	b,n	intr_restore	/* skip past if we've nothing to do */
@@ -974,8 +945,8 @@ intr_do_preempt:
 
 	/* current_thread_info()->preempt_count */
 	mfctl	%cr30, %r1
-	LDREG	TI_PRE_COUNT(%r1), %r19
+	ldw	TI_PRE_COUNT(%r1), %r19
-	cmpib,COND(<>)	0, %r19, intr_restore	/* if preempt_count > 0 */
+	cmpib,<>	0, %r19, intr_restore	/* if preempt_count > 0 */
 	nop				/* prev insn branched backwards */
 
 	/* check if we interrupted a critical path */
@@ -1716,7 +1687,7 @@ dtlb_fault:
 
 	.macro	fork_like name
 ENTRY_CFI(sys_\name\()_wrapper)
-	LDREG	TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30), %r1
+	mfctl	%cr30,%r1
 	ldo	TASK_REGS(%r1),%r1
 	reg_save %r1
 	mfctl	%cr27, %r28
@@ -1736,7 +1707,7 @@ ENTRY(child_return)
 	BL	schedule_tail, %r2
 	nop
 finish_child_return:
-	LDREG	TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30), %r1
+	mfctl	%cr30,%r1
 	ldo	TASK_REGS(%r1),%r1	 /* get pt regs */
 
 	LDREG	PT_CR27(%r1), %r3
@@ -1747,7 +1718,7 @@ finish_child_return:
 END(child_return)
 
 ENTRY_CFI(sys_rt_sigreturn_wrapper)
-	LDREG	TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r26
+	mfctl	%cr30,%r26
 	ldo	TASK_REGS(%r26),%r26	/* get pt regs */
 	/* Don't save regs, we are going to restore them from sigcontext. */
 	STREG	%r2, -RP_OFFSET(%r30)
@@ -1764,7 +1735,7 @@ ENTRY_CFI(sys_rt_sigreturn_wrapper)
 	LDREG	-RP_OFFSET(%r30), %r2
 
 	/* FIXME: I think we need to restore a few more things here. */
-	LDREG	TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r1
+	mfctl	%cr30,%r1
 	ldo	TASK_REGS(%r1),%r1	/* get pt regs */
 	reg_restore %r1
 
@@ -1783,9 +1754,7 @@ ENTRY(syscall_exit)
 	 */
 
 	/* save return value now */
-
 	mfctl     %cr30, %r1
-	LDREG     TI_TASK(%r1),%r1
 	STREG     %r28,TASK_PT_GR28(%r1)
 
 	/* Seems to me that dp could be wrong here, if the syscall involved
@@ -1796,13 +1765,14 @@ ENTRY(syscall_exit)
 syscall_check_resched:
 
 	/* check for reschedule */
-
+	mfctl	%cr30,%r19
-	LDREG	TI_FLAGS-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r19	/* long */
+	LDREG	TASK_TI_FLAGS(%r19),%r19	/* long */
 	bb,<,n	%r19, 31-TIF_NEED_RESCHED, syscall_do_resched /* forward */
 
 	.import do_signal,code
 syscall_check_sig:
-	LDREG	TI_FLAGS-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r19
+	mfctl	%cr30,%r19
+	LDREG	TASK_TI_FLAGS(%r19),%r19
 	ldi	(_TIF_USER_WORK_MASK & ~_TIF_NEED_RESCHED), %r26
 	and,COND(<>)	%r19, %r26, %r0
 	b,n	syscall_restore	/* skip past if we've nothing to do */
@@ -1813,7 +1783,7 @@ syscall_do_signal:
 	 * consistent with all the relevant state of the process
 	 * before the syscall.  We need to verify this.
 	 */
-	LDREG	TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r1
+	mfctl	%cr30,%r1
 	ldo	TASK_REGS(%r1), %r26		/* struct pt_regs *regs */
 	reg_save %r26
 
@@ -1824,17 +1794,17 @@ syscall_do_signal:
 	BL	do_notify_resume,%r2
 	ldi	1, %r25				/* long in_syscall = 1 */
 
-	LDREG	TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r1
+	mfctl	%cr30,%r1
 	ldo	TASK_REGS(%r1), %r20		/* reload pt_regs */
 	reg_restore %r20
 
 	b,n     syscall_check_sig
 
 syscall_restore:
-	LDREG	TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r1
+	mfctl	%cr30,%r1
 
 	/* Are we being ptraced? */
-	ldw	TASK_FLAGS(%r1),%r19
+	LDREG	TASK_TI_FLAGS(%r1),%r19
 	ldi	_TIF_SYSCALL_TRACE_MASK,%r2
 	and,COND(=)	%r19,%r2,%r0
 	b,n	syscall_restore_rfi
@@ -1873,7 +1843,7 @@ syscall_restore:
 	mtsp	%r1,%sr5			   /* Restore sr5 */
 	mtsp	%r1,%sr6			   /* Restore sr6 */
 
-	depi	3,31,2,%r31			   /* ensure return to user mode. */
+	depi	PRIV_USER,31,2,%r31	/* ensure return to user mode. */
 
 #ifdef CONFIG_64BIT
 	/* decide whether to reset the wide mode bit
@@ -1949,7 +1919,7 @@ syscall_restore_rfi:
 	STREG	%r0,TASK_PT_SR2(%r1)
 
 	LDREG	TASK_PT_GR31(%r1),%r2
-	depi	3,31,2,%r2		   /* ensure return to user mode. */
+	depi	PRIV_USER,31,2,%r2	/* ensure return to user mode. */
 	STREG   %r2,TASK_PT_IAOQ0(%r1)
 	ldo	4(%r2),%r2
 	STREG	%r2,TASK_PT_IAOQ1(%r1)
@@ -1958,10 +1928,10 @@ syscall_restore_rfi:
 
 pt_regs_ok:
 	LDREG	TASK_PT_IAOQ0(%r1),%r2
-	depi	3,31,2,%r2		   /* ensure return to user mode. */
+	depi	PRIV_USER,31,2,%r2	/* ensure return to user mode. */
 	STREG	%r2,TASK_PT_IAOQ0(%r1)
 	LDREG	TASK_PT_IAOQ1(%r1),%r2
-	depi	3,31,2,%r2
+	depi	PRIV_USER,31,2,%r2
 	STREG	%r2,TASK_PT_IAOQ1(%r1)
 	b	intr_restore
 	copy	%r25,%r16

arch/parisc/kernel/firmware.c

@@ -1061,6 +1061,38 @@ int pdc_mem_pdt_read_entries(struct pdc_mem_read_pdt *pret,
 	return retval;
 }
 
+/**
+ * pdc_pim_toc11 - Fetch TOC PIM 1.1 data from firmware.
+ * @ret: pointer to return buffer
+ */
+int pdc_pim_toc11(struct pdc_toc_pim_11 *ret)
+{
+	int retval;
+	unsigned long flags;
+
+	spin_lock_irqsave(&pdc_lock, flags);
+	retval = mem_pdc_call(PDC_PIM, PDC_PIM_TOC, __pa(pdc_result),
+			      __pa(ret), sizeof(*ret));
+	spin_unlock_irqrestore(&pdc_lock, flags);
+	return retval;
+}
+
+/**
+ * pdc_pim_toc20 - Fetch TOC PIM 2.0 data from firmware.
+ * @ret: pointer to return buffer
+ */
+int pdc_pim_toc20(struct pdc_toc_pim_20 *ret)
+{
+	int retval;
+	unsigned long flags;
+
+	spin_lock_irqsave(&pdc_lock, flags);
+	retval = mem_pdc_call(PDC_PIM, PDC_PIM_TOC, __pa(pdc_result),
+			      __pa(ret), sizeof(*ret));
+	spin_unlock_irqrestore(&pdc_lock, flags);
+	return retval;
+}
+
 /**
  * pdc_tod_set - Set the Time-Of-Day clock.
  * @sec: The number of seconds since epoch.

arch/parisc/kernel/ftrace.c

@@ -15,6 +15,7 @@
 #include <linux/uaccess.h>
 #include <linux/kprobes.h>
 #include <linux/ptrace.h>
+#include <linux/jump_label.h>
 
 #include <asm/assembly.h>
 #include <asm/sections.h>
@@ -24,6 +25,8 @@
 #define __hot __section(".text.hot")
 
 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
+static DEFINE_STATIC_KEY_FALSE(ftrace_graph_enable);
+
 /*
  * Hook the return address and push it in the stack of return addrs
  * in current thread info.
@@ -48,25 +51,19 @@ static void __hot prepare_ftrace_return(unsigned long *parent,
 }
 #endif /* CONFIG_FUNCTION_GRAPH_TRACER */
 
+static ftrace_func_t ftrace_func;
+
 void notrace __hot ftrace_function_trampoline(unsigned long parent,
 				unsigned long self_addr,
 				unsigned long org_sp_gr3,
 				struct ftrace_regs *fregs)
 {
-#ifndef CONFIG_DYNAMIC_FTRACE
-	extern ftrace_func_t ftrace_trace_function;
-#endif
 	extern struct ftrace_ops *function_trace_op;
 
-	if (function_trace_op->flags & FTRACE_OPS_FL_ENABLED &&
+	ftrace_func(self_addr, parent, function_trace_op, fregs);
-	    ftrace_trace_function != ftrace_stub)
-		ftrace_trace_function(self_addr, parent,
-				function_trace_op, fregs);
 
 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
-	if (dereference_function_descriptor(ftrace_graph_return) !=
+	if (static_branch_unlikely(&ftrace_graph_enable)) {
-	    dereference_function_descriptor(ftrace_stub) ||
-	    ftrace_graph_entry != ftrace_graph_entry_stub) {
 		unsigned long *parent_rp;
 
 		/* calculate pointer to %rp in stack */
@@ -84,11 +81,13 @@ void notrace __hot ftrace_function_trampoline(unsigned long parent,
 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
 int ftrace_enable_ftrace_graph_caller(void)
 {
+	static_key_enable(&ftrace_graph_enable.key);
 	return 0;
 }
 
 int ftrace_disable_ftrace_graph_caller(void)
 {
+	static_key_enable(&ftrace_graph_enable.key);
 	return 0;
 }
 #endif
@@ -99,8 +98,10 @@ int __init ftrace_dyn_arch_init(void)
 {
 	return 0;
 }
+
 int ftrace_update_ftrace_func(ftrace_func_t func)
 {
+	ftrace_func = func;
 	return 0;
 }
 

arch/parisc/kernel/head.S

@@ -35,7 +35,8 @@ END(boot_args)
 	__HEAD
 
 	.align	4
-	.import init_thread_union,data
+	.import init_task,data
+	.import init_stack,data
 	.import fault_vector_20,code    /* IVA parisc 2.0 32 bit */
 #ifndef CONFIG_64BIT
         .import fault_vector_11,code    /* IVA parisc 1.1 32 bit */
@@ -123,12 +124,12 @@ $pgt_fill_loop:
 	load32		start_parisc,%r11
 
 	/* And the initial task pointer */
-	load32		init_thread_union,%r6
+	load32		init_task,%r6
 	mtctl           %r6,%cr30
 
 	/* And the stack pointer too */
-	ldo             THREAD_SZ_ALGN(%r6),%sp
+	load32		init_stack,%sp
-
+	tophys_r1	%sp
 #if defined(CONFIG_64BIT) && defined(CONFIG_FUNCTION_TRACER)
 	.import _mcount,data
 	/* initialize mcount FPTR */
@@ -186,12 +187,11 @@ common_stext:
 #endif /*CONFIG_SMP*/
 
 #ifdef CONFIG_64BIT
-	tophys_r1	%sp
+	mfctl		%cr30,%r6		/* PCX-W2 firmware bug */
+	tophys_r1	%r6
 
 	/* Save the rfi target address */
-	ldd             TI_TASK-THREAD_SZ_ALGN(%sp), %r10
+	STREG		%r11,  TASK_PT_GR11(%r6)
-	tophys_r1       %r10
-	std             %r11,  TASK_PT_GR11(%r10)
 	/* Switch to wide mode Superdome doesn't support narrow PDC
 	** calls.
 	*/
@@ -206,7 +206,6 @@ common_stext:
         ** Someday, palo might not do this for the Monarch either.
         */
 2:
-	mfctl		%cr30,%r6		/* PCX-W2 firmware bug */
 
 	ldo             PDC_PSW(%r0),%arg0              /* 21 */
 	ldo             PDC_PSW_SET_DEFAULTS(%r0),%arg1 /* 2 */
@@ -216,13 +215,9 @@ common_stext:
 	copy            %r0,%arg3
 
 stext_pdc_ret:
+	LDREG		TASK_PT_GR11(%r6), %r11
+	tovirt_r1	%r6
 	mtctl		%r6,%cr30		/* restore task thread info */
-
-	/* restore rfi target address*/
-	ldd             TI_TASK-THREAD_SZ_ALGN(%sp), %r10
-	tophys_r1       %r10
-	ldd             TASK_PT_GR11(%r10), %r11
-	tovirt_r1       %sp
 #endif
 	
 	/* PARANOID: clear user scratch/user space SR's */
@@ -287,7 +282,9 @@ aligned_rfi:
 
 	load32		KERNEL_PSW,%r10
 	mtctl		%r10,%ipsw
-	
+
+	tovirt_r1	%sp
+
 	/* Jump through hyperspace to Virt Mode */
 	rfi
 	nop
@@ -343,12 +340,13 @@ smp_slave_stext:
 #endif
 
 	/*  Initialize the SP - monarch sets up smp_init_current_idle_task */
-	load32		PA(smp_init_current_idle_task),%sp
+	load32		PA(smp_init_current_idle_task),%r6
-	LDREG		0(%sp),%sp	/* load task address */
+	LDREG		0(%r6),%r6
+	mtctl		%r6,%cr30
+	tophys_r1	%r6
+	LDREG           TASK_STACK(%r6),%sp
 	tophys_r1	%sp
-	LDREG		TASK_THREAD_INFO(%sp),%sp
+	ldo		FRAME_SIZE(%sp),%sp
-	mtctl           %sp,%cr30       /* store in cr30 */
-	ldo             THREAD_SZ_ALGN(%sp),%sp
 
 	/* point CPU to kernel page tables */
 	load32		PA(swapper_pg_dir),%r4

arch/parisc/kernel/irq.c

@@ -15,6 +15,7 @@
 #include <linux/kernel_stat.h>
 #include <linux/seq_file.h>
 #include <linux/types.h>
+#include <linux/sched/task_stack.h>
 #include <asm/io.h>
 
 #include <asm/softirq_stack.h>
@@ -399,8 +400,7 @@ static inline void stack_overflow_check(struct pt_regs *regs)
 #ifdef CONFIG_DEBUG_STACKOVERFLOW
 	#define STACK_MARGIN	(256*6)
 
-	/* Our stack starts directly behind the thread_info struct. */
+	unsigned long stack_start = (unsigned long) task_stack_page(current);
-	unsigned long stack_start = (unsigned long) current_thread_info();
 	unsigned long sp = regs->gr[30];
 	unsigned long stack_usage;
 	unsigned int *last_usage;
@@ -476,7 +476,7 @@ static void execute_on_irq_stack(void *func, unsigned long param1)
 	union_ptr = &per_cpu(irq_stack_union, smp_processor_id());
 	irq_stack = (unsigned long) &union_ptr->stack;
 	irq_stack = ALIGN(irq_stack + sizeof(irq_stack_union.slock),
-			 64); /* align for stack frame usage */
+			FRAME_ALIGN); /* align for stack frame usage */
 
 	/* We may be called recursive. If we are already using the irq stack,
 	 * just continue to use it. Use spinlocks to serialize

arch/parisc/kernel/pdt.c

@@ -352,12 +352,10 @@ static int __init pdt_initcall(void)
 	if (pdt_type == PDT_NONE)
 		return -ENODEV;
 
-	kpdtd_task = kthread_create(pdt_mainloop, NULL, "kpdtd");
+	kpdtd_task = kthread_run(pdt_mainloop, NULL, "kpdtd");
 	if (IS_ERR(kpdtd_task))
 		return PTR_ERR(kpdtd_task);
 
-	wake_up_process(kpdtd_task);
-
 	return 0;
 }
 

arch/parisc/kernel/process.c

@@ -205,7 +205,7 @@ copy_thread(unsigned long clone_flags, unsigned long usp,
 		/* Must exit via ret_from_kernel_thread in order
 		 * to call schedule_tail()
 		 */
-		cregs->ksp = (unsigned long)stack + THREAD_SZ_ALGN + FRAME_SIZE;
+		cregs->ksp = (unsigned long) stack + FRAME_SIZE + PT_SZ_ALGN;
 		cregs->kpc = (unsigned long) &ret_from_kernel_thread;
 		/*
 		 * Copy function and argument to be called from
@@ -228,7 +228,7 @@ copy_thread(unsigned long clone_flags, unsigned long usp,
 			if (likely(usp))
 				cregs->gr[30] = usp;
 		}
-		cregs->ksp = (unsigned long)stack + THREAD_SZ_ALGN + FRAME_SIZE;
+		cregs->ksp = (unsigned long) stack + FRAME_SIZE;
 		cregs->kpc = (unsigned long) &child_return;
 
 		/* Setup thread TLS area */

arch/parisc/kernel/smp.c

@@ -29,6 +29,7 @@
 #include <linux/bitops.h>
 #include <linux/ftrace.h>
 #include <linux/cpu.h>
+#include <linux/kgdb.h>
 
 #include <linux/atomic.h>
 #include <asm/current.h>
@@ -69,7 +70,10 @@ enum ipi_message_type {
 	IPI_CALL_FUNC,
 	IPI_CPU_START,
 	IPI_CPU_STOP,
-	IPI_CPU_TEST
+	IPI_CPU_TEST,
+#ifdef CONFIG_KGDB
+	IPI_ENTER_KGDB,
+#endif
 };
 
 
@@ -167,7 +171,12 @@ ipi_interrupt(int irq, void *dev_id)
 			case IPI_CPU_TEST:
 				smp_debug(100, KERN_DEBUG "CPU%d is alive!\n", this_cpu);
 				break;
-
+#ifdef CONFIG_KGDB
+			case IPI_ENTER_KGDB:
+				smp_debug(100, KERN_DEBUG "CPU%d ENTER_KGDB\n", this_cpu);
+				kgdb_nmicallback(raw_smp_processor_id(), get_irq_regs());
+				break;
+#endif
 			default:
 				printk(KERN_CRIT "Unknown IPI num on CPU%d: %lu\n",
 					this_cpu, which);
@@ -219,13 +228,21 @@ static inline void
 send_IPI_allbutself(enum ipi_message_type op)
 {
 	int i;
-	
+
+	preempt_disable();
 	for_each_online_cpu(i) {
 		if (i != smp_processor_id())
 			send_IPI_single(i, op);
 	}
+	preempt_enable();
 }
 
+#ifdef CONFIG_KGDB
+void kgdb_roundup_cpus(void)
+{
+	send_IPI_allbutself(IPI_ENTER_KGDB);
+}
+#endif
 
 inline void 
 smp_send_stop(void)	{ send_IPI_allbutself(IPI_CPU_STOP); }
@@ -322,7 +339,7 @@ int smp_boot_one_cpu(int cpuid, struct task_struct *idle)
 	const struct cpuinfo_parisc *p = &per_cpu(cpu_data, cpuid);
 	long timeout;
 
-	task_thread_info(idle)->cpu = cpuid;
+	idle->cpu = cpuid;
 
 	/* Let _start know what logical CPU we're booting
 	** (offset into init_tasks[],cpu_data[])

arch/parisc/kernel/stacktrace.c

@@ -2,45 +2,41 @@
 /*
  * Stack trace management functions
  *
- *  Copyright (C) 2009 Helge Deller <deller@gmx.de>
+ *  Copyright (C) 2009-2021 Helge Deller <deller@gmx.de>
  *  based on arch/x86/kernel/stacktrace.c by Ingo Molnar <mingo@redhat.com>
  *  and parisc unwind functions by Randolph Chung <tausq@debian.org>
  *
  *  TODO: Userspace stacktrace (CONFIG_USER_STACKTRACE_SUPPORT)
  */
-#include <linux/module.h>
 #include <linux/stacktrace.h>
 
 #include <asm/unwind.h>
 
-static void dump_trace(struct task_struct *task, struct stack_trace *trace)
+static void notrace walk_stackframe(struct task_struct *task,
+	struct pt_regs *regs, bool (*fn)(void *, unsigned long), void *cookie)
 {
 	struct unwind_frame_info info;
 
 	unwind_frame_init_task(&info, task, NULL);
-
+	while (1) {
-	/* unwind stack and save entries in stack_trace struct */
-	trace->nr_entries = 0;
-	while (trace->nr_entries < trace->max_entries) {
 		if (unwind_once(&info) < 0 || info.ip == 0)
 			break;
 
 		if (__kernel_text_address(info.ip))
-			trace->entries[trace->nr_entries++] = info.ip;
+			if (!fn(cookie, info.ip))
+				break;
 	}
 }
 
-/*
+void arch_stack_walk(stack_trace_consume_fn consume_entry, void *cookie,
- * Save stack-backtrace addresses into a stack_trace buffer.
+		     struct task_struct *task, struct pt_regs *regs)
- */
-void save_stack_trace(struct stack_trace *trace)
 {
-	dump_trace(current, trace);
+	walk_stackframe(task, regs, consume_entry, cookie);
 }
-EXPORT_SYMBOL_GPL(save_stack_trace);
 
-void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
+int arch_stack_walk_reliable(stack_trace_consume_fn consume_entry, void *cookie,
+			     struct task_struct *task)
 {
-	dump_trace(tsk, trace);
+	walk_stackframe(task, NULL, consume_entry, cookie);
+	return 1;
 }
-EXPORT_SYMBOL_GPL(save_stack_trace_tsk);

arch/parisc/kernel/sys_parisc.c

@@ -409,10 +409,12 @@ long parisc_personality(unsigned long personality)
 
 static int FIX_O_NONBLOCK(int flags)
 {
-	if (flags & O_NONBLOCK_MASK_OUT) {
+	if ((flags & O_NONBLOCK_MASK_OUT) &&
-		struct task_struct *tsk = current;
+			!test_thread_flag(TIF_NONBLOCK_WARNING)) {
-		pr_warn_once("%s(%d) uses a deprecated O_NONBLOCK value.\n",
+		set_thread_flag(TIF_NONBLOCK_WARNING);
-			tsk->comm, tsk->pid);
+		pr_warn("%s(%d) uses a deprecated O_NONBLOCK value."
+			" Please recompile with newer glibc.\n",
+			current->comm, current->pid);
 	}
 	return flags & ~O_NONBLOCK_MASK_OUT;
 }

arch/parisc/kernel/syscall.S

@@ -78,7 +78,7 @@ ENTRY(linux_gateway_page)
 
 lws_entry:
 	gate	lws_start, %r0		/* increase privilege */
-	depi	3, 31, 2, %r31		/* Ensure we return into user mode. */
+	depi	PRIV_USER, 31, 2, %r31	/* Ensure we return into user mode. */
 
 	/* Fill from 0xb8 to 0xe0 */
 	.rept 10
@@ -89,7 +89,7 @@ lws_entry:
 	mechanism to work. DO NOT MOVE THIS CODE EVER! */
 set_thread_pointer:
 	gate	.+8, %r0		/* increase privilege */
-	depi	3, 31, 2, %r31		/* Ensure we return into user mode. */
+	depi	PRIV_USER, 31, 2, %r31	/* Ensure we return into user mode. */
 	be	0(%sr7,%r31)		/* return to user space */
 	mtctl	%r26, %cr27		/* move arg0 to the control register */
 
@@ -139,9 +139,9 @@ linux_gateway_entry:
 	xor     %r1,%r30,%r30                   /* ye olde xor trick */
 	xor     %r1,%r30,%r1
 	xor     %r1,%r30,%r30
-	
-	ldo     THREAD_SZ_ALGN+FRAME_SIZE(%r30),%r30  /* set up kernel stack */
 
+	LDREG	TASK_STACK(%r30),%r30		/* set up kernel stack */
+	ldo	FRAME_SIZE(%r30),%r30
 	/* N.B.: It is critical that we don't set sr7 to 0 until r30
 	 *       contains a valid kernel stack pointer. It is also
 	 *       critical that we don't start using the kernel stack
@@ -152,7 +152,6 @@ linux_gateway_entry:
 	ssm	PSW_SM_I, %r0			/* enable interrupts */
 	STREGM	%r1,FRAME_SIZE(%r30)		/* save r1 (usp) here for now */
 	mfctl	%cr30,%r1			/* get task ptr in %r1 */
-	LDREG	TI_TASK(%r1),%r1
 
 	/* Save some registers for sigcontext and potential task
 	   switch (see entry.S for the details of which ones are
@@ -207,7 +206,7 @@ linux_gateway_entry:
 
 	/* Are we being ptraced? */
 	mfctl	%cr30, %r1
-	LDREG	TI_FLAGS(%r1),%r1
+	LDREG	TASK_TI_FLAGS(%r1),%r1
 	ldi	_TIF_SYSCALL_TRACE_MASK, %r19
 	and,COND(=) %r1, %r19, %r0
 	b,n	.Ltracesys
@@ -272,8 +271,7 @@ tracesys:
 	 * C bit set, a non-straced syscall entry results in C and D clear
 	 * in the saved PSW.
 	 */
-	ldo     -THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r1      /* get task ptr */
+	mfctl	%cr30,%r1			/* get task ptr */
-	LDREG	TI_TASK(%r1), %r1
 	ssm	0,%r2
 	STREG	%r2,TASK_PT_PSW(%r1)		/* Lower 8 bits only!! */
 	mfsp	%sr0,%r2
@@ -327,8 +325,7 @@ tracesys_next:
 	 */
 	copy	%ret0,%r20
 
-	ldo     -THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r1      /* get task ptr */
+	mfctl	%cr30,%r1			/* get task ptr */
-	LDREG	TI_TASK(%r1), %r1
 	LDREG   TASK_PT_GR28(%r1), %r28		/* Restore return value */
 	LDREG   TASK_PT_GR26(%r1), %r26		/* Restore the users args */
 	LDREG   TASK_PT_GR25(%r1), %r25
@@ -385,16 +382,14 @@ tracesys_next:
 	makes a direct call to syscall_trace. */
 	
 tracesys_exit:
-	ldo     -THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r1      /* get task ptr */
+	mfctl	%cr30,%r1			/* get task ptr */
-	LDREG	TI_TASK(%r1), %r1
 #ifdef CONFIG_64BIT
 	ldo	-16(%r30),%r29			/* Reference param save area */
 #endif
 	ldo	TASK_REGS(%r1),%r26
 	BL	do_syscall_trace_exit,%r2
 	STREG   %r28,TASK_PT_GR28(%r1)          /* save return value now */
-	ldo     -THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r1      /* get task ptr */
+	mfctl	%cr30,%r1			/* get task ptr */
-	LDREG	TI_TASK(%r1), %r1
 	LDREG   TASK_PT_GR28(%r1), %r28		/* Restore return val. */
 
 	ldil	L%syscall_exit,%r1
@@ -407,8 +402,7 @@ tracesys_exit:
 	ldo	R%tracesys_sigexit(%r2),%r2
 
 tracesys_sigexit:
-	ldo     -THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r1      /* get task ptr */
+	mfctl	%cr30,%r1			/* get task ptr */
-	LDREG	TI_TASK(%r1), %r1
 #ifdef CONFIG_64BIT
 	ldo	-16(%r30),%r29			/* Reference param save area */
 #endif

arch/parisc/kernel/toc.c

@@ -0,0 +1,111 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <linux/kernel.h>
+#include <linux/kgdb.h>
+#include <linux/printk.h>
+#include <linux/sched/debug.h>
+#include <linux/delay.h>
+#include <linux/reboot.h>
+
+#include <asm/pdc.h>
+#include <asm/pdc_chassis.h>
+
+unsigned int __aligned(16) toc_lock = 1;
+
+static void toc20_to_pt_regs(struct pt_regs *regs, struct pdc_toc_pim_20 *toc)
+{
+	int i;
+
+	regs->gr[0] = (unsigned long)toc->cr[22];
+
+	for (i = 1; i < 32; i++)
+		regs->gr[i] = (unsigned long)toc->gr[i];
+
+	for (i = 0; i < 8; i++)
+		regs->sr[i] = (unsigned long)toc->sr[i];
+
+	regs->iasq[0] = (unsigned long)toc->cr[17];
+	regs->iasq[1] = (unsigned long)toc->iasq_back;
+	regs->iaoq[0] = (unsigned long)toc->cr[18];
+	regs->iaoq[1] = (unsigned long)toc->iaoq_back;
+
+	regs->sar = (unsigned long)toc->cr[11];
+	regs->iir = (unsigned long)toc->cr[19];
+	regs->isr = (unsigned long)toc->cr[20];
+	regs->ior = (unsigned long)toc->cr[21];
+}
+
+static void toc11_to_pt_regs(struct pt_regs *regs, struct pdc_toc_pim_11 *toc)
+{
+	int i;
+
+	regs->gr[0] = toc->cr[22];
+
+	for (i = 1; i < 32; i++)
+		regs->gr[i] = toc->gr[i];
+
+	for (i = 0; i < 8; i++)
+		regs->sr[i] = toc->sr[i];
+
+	regs->iasq[0] = toc->cr[17];
+	regs->iasq[1] = toc->iasq_back;
+	regs->iaoq[0] = toc->cr[18];
+	regs->iaoq[1] = toc->iaoq_back;
+
+	regs->sar  = toc->cr[11];
+	regs->iir  = toc->cr[19];
+	regs->isr  = toc->cr[20];
+	regs->ior  = toc->cr[21];
+}
+
+void notrace __noreturn __cold toc_intr(struct pt_regs *regs)
+{
+	struct pdc_toc_pim_20 pim_data20;
+	struct pdc_toc_pim_11 pim_data11;
+
+	nmi_enter();
+
+	if (boot_cpu_data.cpu_type >= pcxu) {
+		if (pdc_pim_toc20(&pim_data20))
+			panic("Failed to get PIM data");
+		toc20_to_pt_regs(regs, &pim_data20);
+	} else {
+		if (pdc_pim_toc11(&pim_data11))
+			panic("Failed to get PIM data");
+		toc11_to_pt_regs(regs, &pim_data11);
+	}
+
+#ifdef CONFIG_KGDB
+	if (atomic_read(&kgdb_active) != -1)
+		kgdb_nmicallback(raw_smp_processor_id(), regs);
+	kgdb_handle_exception(9, SIGTRAP, 0, regs);
+#endif
+	show_regs(regs);
+
+	/* give other CPUs time to show their backtrace */
+	mdelay(2000);
+	machine_restart("TOC");
+
+	/* should never reach this */
+	panic("TOC");
+}
+
+static __init int setup_toc(void)
+{
+	unsigned int csum = 0;
+	unsigned long toc_code = (unsigned long)dereference_function_descriptor(toc_handler);
+	int i;
+
+	PAGE0->vec_toc = __pa(toc_code) & 0xffffffff;
+#ifdef CONFIG_64BIT
+	PAGE0->vec_toc_hi = __pa(toc_code) >> 32;
+#endif
+	PAGE0->vec_toclen = toc_handler_size;
+
+	for (i = 0; i < toc_handler_size/4; i++)
+		csum += ((u32 *)toc_code)[i];
+	toc_handler_csum = -csum;
+	pr_info("TOC handler registered\n");
+	return 0;
+}
+early_initcall(setup_toc);

arch/parisc/kernel/toc_asm.S

@@ -0,0 +1,88 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
+/* TOC (Transfer of Control) handler. */
+
+	.level 1.1
+
+#include <asm/assembly.h>
+#include <asm/psw.h>
+#include <linux/threads.h>
+#include <linux/linkage.h>
+
+	.text
+	.import toc_intr,code
+	.import toc_lock,data
+	.align 16
+ENTRY_CFI(toc_handler)
+	/*
+	 * synchronize CPUs and obtain offset
+	 * for stack setup.
+	 */
+	load32		PA(toc_lock),%r1
+0:	ldcw,co		0(%r1),%r2
+	cmpib,=		0,%r2,0b
+	nop
+	addi		1,%r2,%r4
+	stw		%r4,0(%r1)
+	addi		-1,%r2,%r4
+
+	load32	PA(toc_stack),%sp
+	/*
+	 * deposit CPU number into stack address,
+	 * so every CPU will have its own stack.
+	 */
+	SHLREG	%r4,14,%r4
+	add	%r4,%sp,%sp
+
+	/*
+	 * setup pt_regs on stack and save the
+	 * floating point registers. PIM_TOC doesn't
+	 * save fp registers, so we're doing it here.
+	 */
+	copy	%sp,%arg0
+	ldo	PT_SZ_ALGN(%sp), %sp
+
+	/* clear pt_regs */
+	copy	%arg0,%r1
+0:	cmpb,<<,n %r1,%sp,0b
+	stw,ma	%r0,4(%r1)
+
+	ldo	PT_FR0(%arg0),%r25
+	save_fp	%r25
+
+	/* go virtual */
+	load32	PA(swapper_pg_dir),%r4
+	mtctl	%r4,%cr24
+	mtctl	%r4,%cr25
+
+	/* Clear sr4-sr7 */
+	mtsp	%r0, %sr4
+	mtsp	%r0, %sr5
+	mtsp	%r0, %sr6
+	mtsp	%r0, %sr7
+
+	tovirt_r1 %sp
+	tovirt_r1 %arg0
+	virt_map
+
+	loadgp
+
+#ifdef CONFIG_64BIT
+	ldo	-16(%sp),%r29
+#endif
+	load32	toc_intr,%r1
+	be	0(%sr7,%r1)
+	nop
+ENDPROC_CFI(toc_handler)
+
+	/*
+	 * keep this checksum here, as it is part of the toc_handler
+	 * spanned by toc_handler_size (all words in toc_handler are
+	 * added in PDC and the sum must equal to zero.
+	 */
+SYM_DATA(toc_handler_csum, .long 0)
+SYM_DATA(toc_handler_size, .long . - toc_handler)
+
+	__PAGE_ALIGNED_BSS
+	.align 64
+SYM_DATA(toc_stack, .block 16384*NR_CPUS)

arch/parisc/kernel/traps.c

@@ -30,6 +30,7 @@
 #include <linux/ratelimit.h>
 #include <linux/uaccess.h>
 #include <linux/kdebug.h>
+#include <linux/kfence.h>
 
 #include <asm/assembly.h>
 #include <asm/io.h>
@@ -143,7 +144,7 @@ void show_regs(struct pt_regs *regs)
 	printk("%s IIR: %08lx    ISR: " RFMT "  IOR: " RFMT "\n",
 	       level, regs->iir, regs->isr, regs->ior);
 	printk("%s CPU: %8d   CR30: " RFMT " CR31: " RFMT "\n",
-	       level, current_thread_info()->cpu, cr30, cr31);
+	       level, task_cpu(current), cr30, cr31);
 	printk("%s ORIG_R28: " RFMT "\n", level, regs->orig_r28);
 
 	if (user) {
@@ -787,6 +788,10 @@ void notrace handle_interruption(int code, struct pt_regs *regs)
 		/* Clean up and return if in exception table. */
 		if (fixup_exception(regs))
 			return;
+		/* Clean up and return if handled by kfence. */
+		if (kfence_handle_page_fault(fault_address,
+			parisc_acctyp(code, regs->iir) == VM_WRITE, regs))
+			return;
 		pdc_chassis_send_status(PDC_CHASSIS_DIRECT_PANIC);
 		parisc_terminate("Kernel Fault", regs, code, fault_address);
 	    }

arch/parisc/kernel/unwind.c

@@ -14,6 +14,7 @@
 #include <linux/sched.h>
 #include <linux/slab.h>
 #include <linux/sort.h>
+#include <linux/sched/task_stack.h>
 
 #include <linux/uaccess.h>
 #include <asm/assembly.h>
@@ -21,6 +22,8 @@
 #include <asm/ptrace.h>
 
 #include <asm/unwind.h>
+#include <asm/switch_to.h>
+#include <asm/sections.h>
 
 /* #define DEBUG 1 */
 #ifdef DEBUG
@@ -203,6 +206,11 @@ int __init unwind_init(void)
 	return 0;
 }
 
+static bool pc_is_kernel_fn(unsigned long pc, void *fn)
+{
+	return (unsigned long)dereference_kernel_function_descriptor(fn) == pc;
+}
+
 static int unwind_special(struct unwind_frame_info *info, unsigned long pc, int frame_size)
 {
 	/*
@@ -221,7 +229,7 @@ static int unwind_special(struct unwind_frame_info *info, unsigned long pc, int
 	extern void * const _call_on_stack;
 #endif /* CONFIG_IRQSTACKS */
 
-	if (pc == (unsigned long) &handle_interruption) {
+	if (pc_is_kernel_fn(pc, handle_interruption)) {
 		struct pt_regs *regs = (struct pt_regs *)(info->sp - frame_size - PT_SZ_ALGN);
 		dbg("Unwinding through handle_interruption()\n");
 		info->prev_sp = regs->gr[30];
@@ -229,13 +237,13 @@ static int unwind_special(struct unwind_frame_info *info, unsigned long pc, int
 		return 1;
 	}
 
-	if (pc == (unsigned long) &ret_from_kernel_thread ||
+	if (pc_is_kernel_fn(pc, ret_from_kernel_thread) ||
-	    pc == (unsigned long) &syscall_exit) {
+	    pc_is_kernel_fn(pc, syscall_exit)) {
 		info->prev_sp = info->prev_ip = 0;
 		return 1;
 	}
 
-	if (pc == (unsigned long) &intr_return) {
+	if (pc_is_kernel_fn(pc, intr_return)) {
 		struct pt_regs *regs;
 
 		dbg("Found intr_return()\n");
@@ -246,20 +254,20 @@ static int unwind_special(struct unwind_frame_info *info, unsigned long pc, int
 		return 1;
 	}
 
-	if (pc == (unsigned long) &_switch_to_ret) {
+	if (pc_is_kernel_fn(pc, _switch_to) ||
+	    pc_is_kernel_fn(pc, _switch_to_ret)) {
 		info->prev_sp = info->sp - CALLEE_SAVE_FRAME_SIZE;
 		info->prev_ip = *(unsigned long *)(info->prev_sp - RP_OFFSET);
 		return 1;
 	}
 
 #ifdef CONFIG_IRQSTACKS
-	if (pc == (unsigned long) &_call_on_stack) {
+	if (pc_is_kernel_fn(pc, _call_on_stack)) {
 		info->prev_sp = *(unsigned long *)(info->sp - FRAME_SIZE - REG_SZ);
 		info->prev_ip = *(unsigned long *)(info->sp - FRAME_SIZE - RP_OFFSET);
 		return 1;
 	}
 #endif
-
 	return 0;
 }
 
@@ -292,17 +300,15 @@ static void unwind_frame_regs(struct unwind_frame_info *info)
 			info->prev_sp = sp - 64;
 			info->prev_ip = 0;
 
-			/* The stack is at the end inside the thread_union
+			/* Check if stack is inside kernel stack area */
-			 * struct. If we reach data, we have reached the
+			if ((info->prev_sp - (unsigned long) task_stack_page(info->t))
-			 * beginning of the stack and should stop unwinding. */
+					>= THREAD_SIZE) {
-			if (info->prev_sp >= (unsigned long) task_thread_info(info->t) &&
-			    info->prev_sp < ((unsigned long) task_thread_info(info->t)
-						+ THREAD_SZ_ALGN)) {
 				info->prev_sp = 0;
 				break;
 			}
 
-			if (get_user(tmp, (unsigned long *)(info->prev_sp - RP_OFFSET))) 
+			if (copy_from_kernel_nofault(&tmp,
+			    (void *)info->prev_sp - RP_OFFSET, sizeof(tmp)))
 				break;
 			info->prev_ip = tmp;
 			sp = info->prev_sp;

arch/parisc/lib/bitops.c

@@ -18,7 +18,7 @@ arch_spinlock_t __atomic_hash[ATOMIC_HASH_SIZE] __lock_aligned = {
 #endif
 
 #ifdef CONFIG_64BIT
-unsigned long __xchg64(unsigned long x, volatile unsigned long *ptr)
+unsigned long notrace __xchg64(unsigned long x, volatile unsigned long *ptr)
 {
 	unsigned long temp, flags;
 
@@ -30,7 +30,7 @@ unsigned long __xchg64(unsigned long x, volatile unsigned long *ptr)
 }
 #endif
 
-unsigned long __xchg32(int x, volatile int *ptr)
+unsigned long notrace __xchg32(int x, volatile int *ptr)
 {
 	unsigned long flags;
 	long temp;
@@ -43,7 +43,7 @@ unsigned long __xchg32(int x, volatile int *ptr)
 }
 
 
-unsigned long __xchg8(char x, volatile char *ptr)
+unsigned long notrace __xchg8(char x, volatile char *ptr)
 {
 	unsigned long flags;
 	long temp;
@@ -56,7 +56,7 @@ unsigned long __xchg8(char x, volatile char *ptr)
 }
 
 
-u64 __cmpxchg_u64(volatile u64 *ptr, u64 old, u64 new)
+u64 notrace __cmpxchg_u64(volatile u64 *ptr, u64 old, u64 new)
 {
 	unsigned long flags;
 	u64 prev;
@@ -68,7 +68,7 @@ u64 __cmpxchg_u64(volatile u64 *ptr, u64 old, u64 new)
 	return prev;
 }
 
-unsigned long __cmpxchg_u32(volatile unsigned int *ptr, unsigned int old, unsigned int new)
+unsigned long notrace __cmpxchg_u32(volatile unsigned int *ptr, unsigned int old, unsigned int new)
 {
 	unsigned long flags;
 	unsigned int prev;
@@ -80,7 +80,7 @@ unsigned long __cmpxchg_u32(volatile unsigned int *ptr, unsigned int old, unsign
 	return (unsigned long)prev;
 }
 
-u8 __cmpxchg_u8(volatile u8 *ptr, u8 old, u8 new)
+u8 notrace __cmpxchg_u8(volatile u8 *ptr, u8 old, u8 new)
 {
 	unsigned long flags;
 	u8 prev;

arch/parisc/mm/fault.c

@@ -48,7 +48,7 @@ int show_unhandled_signals = 1;
  *   VM_WRITE if write operation
  *   VM_EXEC  if execute operation
  */
-static unsigned long
+unsigned long
 parisc_acctyp(unsigned long code, unsigned int inst)
 {
 	if (code == 6 || code == 16)

arch/parisc/mm/fixmap.c

@@ -20,12 +20,9 @@ void notrace set_fixmap(enum fixed_addresses idx, phys_addr_t phys)
 	pte_t *pte;
 
 	if (pmd_none(*pmd))
-		pmd = pmd_alloc(NULL, pud, vaddr);
-
-	pte = pte_offset_kernel(pmd, vaddr);
-	if (pte_none(*pte))
 		pte = pte_alloc_kernel(pmd, vaddr);
 
+	pte = pte_offset_kernel(pmd, vaddr);
 	set_pte_at(&init_mm, vaddr, pte, __mk_pte(phys, PAGE_KERNEL_RWX));
 	flush_tlb_kernel_range(vaddr, vaddr + PAGE_SIZE);
 }

arch/parisc/mm/init.c

@@ -127,16 +127,12 @@ static void __init setup_bootmem(void)
 		int j;
 
 		for (j = i; j > 0; j--) {
-			physmem_range_t tmp;
-
 			if (pmem_ranges[j-1].start_pfn <
 			    pmem_ranges[j].start_pfn) {
 
 				break;
 			}
-			tmp = pmem_ranges[j-1];
+			swap(pmem_ranges[j-1], pmem_ranges[j]);
-			pmem_ranges[j-1] = pmem_ranges[j];
-			pmem_ranges[j] = tmp;
 		}
 	}
 
@@ -842,9 +838,9 @@ void flush_tlb_all(void)
 {
 	int do_recycle;
 
-	__inc_irq_stat(irq_tlb_count);
 	do_recycle = 0;
 	spin_lock(&sid_lock);
+	__inc_irq_stat(irq_tlb_count);
 	if (dirty_space_ids > RECYCLE_THRESHOLD) {
 	    BUG_ON(recycle_inuse);  /* FIXME: Use a semaphore/wait queue here */
 	    get_dirty_sids(&recycle_ndirty,recycle_dirty_array);
@@ -863,8 +859,8 @@ void flush_tlb_all(void)
 #else
 void flush_tlb_all(void)
 {
-	__inc_irq_stat(irq_tlb_count);
 	spin_lock(&sid_lock);
+	__inc_irq_stat(irq_tlb_count);
 	flush_tlb_all_local(NULL);
 	recycle_sids();
 	spin_unlock(&sid_lock);

include/linux/sched/task_stack.h

@@ -25,7 +25,11 @@ static inline void *task_stack_page(const struct task_struct *task)
 
 static inline unsigned long *end_of_stack(const struct task_struct *task)
 {
+#ifdef CONFIG_STACK_GROWSUP
+	return (unsigned long *)((unsigned long)task->stack + THREAD_SIZE) - 1;
+#else
 	return task->stack;
+#endif
 }
 
 #elif !defined(__HAVE_THREAD_FUNCTIONS)