[PATCH] s390/s390x unification (1/7)

Merge s390x and s390 to one architecture.

Makefile

@@ -33,7 +33,9 @@ KERNELRELEASE=$(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
 # then ARCH is assigned, getting whatever value it gets normally, and 
 # SUBARCH is subsequently ignored.
 
-SUBARCH := $(shell uname -m | sed -e s/i.86/i386/ -e s/sun4u/sparc64/ -e s/arm.*/arm/ -e s/sa110/arm/)
+SUBARCH := $(shell uname -m | sed -e s/i.86/i386/ -e s/sun4u/sparc64/ \
+				  -e s/arm.*/arm/ -e s/sa110/arm/ \
+				  -e s/s390x/s390/ )
 ARCH := $(SUBARCH)
 
 # Remove hyphens since they have special meaning in RPM filenames

arch/s390/Kconfig

@@ -7,10 +7,6 @@ config MMU
 	bool
 	default y
 
-config UID16
-	bool
-	default y
-
 config RWSEM_GENERIC_SPINLOCK
 	bool
 
@@ -26,18 +22,29 @@ mainmenu "Linux Kernel Configuration"
 config ARCH_S390
 	bool
 	default y
-	help
-	  Select this option, if you want to run the Kernel on one of IBM's
-	  mainframes of the S/390 generation. You should have installed the
-	  s390-compiler released by IBM (based on gcc-2.95.1) before.
 
-source "init/Kconfig"
+config UID16
+	bool
+	default y
+	depends on ARCH_S390X = 'n'
 
+source "init/Kconfig"
 
 menu "Base setup"
 
 comment "Processor type and features"
 
+config ARCH_S390X
+	bool "64 bit kernel"
+	help
+	  Select this option if you have a 64 bit IBM zSeries machine
+	  and want to use the 64 bit addressing mode.
+
+config ARCH_S390_31
+	bool
+	depends on ARCH_S390X = 'n'
+	default y
+
 config SMP
 	bool "Symmetric multi-processing support"
 	---help---
@@ -51,32 +58,15 @@ config SMP
 	  singleprocessor machines. On a singleprocessor machine, the kernel
 	  will run faster if you say N here.
 
-	  Note that if you say Y here and choose architecture "586" or
-	  "Pentium" under "Processor family", the kernel will not work on 486
-	  architectures. Similarly, multiprocessor kernels for the "PPro"
-	  architecture may not work on all Pentium based boards.
-
-	  People using multiprocessor machines who say Y here should also say
-	  Y to "Enhanced Real Time Clock Support", below. The "Advanced Power
-	  Management" code will be disabled if you say Y here.
-
 	  See also the <file:Documentation/smp.tex>,
-	  <file:Documentation/smp.txt>, <file:Documentation/i386/IO-APIC.txt>,
-	  <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
+	  <file:Documentation/smp.txt> and the SMP-HOWTO available at
 	  <http://www.linuxdoc.org/docs.html#howto>.
 
-	  If you don't know what to do here, say N.
-
-config MATHEMU
-	bool "IEEE FPU emulation"
-	help
-	  This option is required for IEEE compliant floating point arithmetic
-	  on the Alpha. The only time you would ever not say Y is to say M in
-	  order to debug the code. Say Y unless you know what you are doing.
+	  Even if you don't know what to do here, say Y.
 
 config NR_CPUS
 	int "Maximum number of CPUs (2-32)"
-	depends on SMP
+	depends on SMP && ARCH_S390X = 'n'
 	default "32"
 	help
 	  This allows you to specify the maximum number of CPUs which this
@@ -85,13 +75,54 @@ config NR_CPUS
 
 	  This is purely to save memory - each supported CPU adds
 	  approximately eight kilobytes to the kernel image.
+	
+config NR_CPUS
+	int "Maximum number of CPUs (2-64)"
+	depends on SMP && ARCH_S390X
+	default "64"
+	help
+	  This allows you to specify the maximum number of CPUs which this
+	  kernel will support.  The maximum supported value is 64 and the
+	  minimum value which makes sense is 2.
+
+	  This is purely to save memory - each supported CPU adds
+	  approximately sixteen kilobytes to the kernel image.
+
+config MATHEMU
+	bool "IEEE FPU emulation"
+	depends on ARCH_S390X = n
+	help
+	  This option is required for IEEE compliant floating point arithmetic
+	  on older S/390 machines. Say Y unless you know your machine doesn't 
+	  need this.
+
+config S390_SUPPORT
+	bool "Kernel support for 31 bit emulation"
+	depends on ARCH_S390X
+	help
+	  Select this option if you want to enable your system kernel to
+	  handle system-calls from ELF binaries for 31 bit ESA.  This option
+	  (and some other stuff like libraries and such) is needed for
+	  executing 31 bit applications.  It is safe to say "Y".
+
+config COMPAT
+	bool
+	depends on S390_SUPPORT
+	default y
+
+config BINFMT_ELF32
+	tristate "Kernel support for 31 bit ELF binaries"
+	depends on S390_SUPPORT
+	help
+	  This allows you to run 32-bit Linux/ELF binaries on your zSeries
+	  in 64 bit mode. Everybody wants this; say Y.
 
 comment "I/O subsystem configuration"
 
 config MACHCHK_WARNING
 	bool "Process warning machine checks"
 	help
-	  Select this option if you want the machine check handler on IBM S/390 or 
+	  Select this option if you want the machine check handler on IBM S/390 or
 	  zSeries to process warning machine checks (e.g. on power failures). 
 	  If unsure, say "Y".
 
@@ -144,15 +175,15 @@ choice
 	prompt "IPL method generated into head.S"
 	depends on IPL
 	default IPL_TAPE
-
-config IPL_TAPE
-	bool "tape"
 	help
 	  Select "tape" if you want to IPL the image from a Tape.
 
 	  Select "vm_reader" if you are running under VM/ESA and want
 	  to IPL the image from the emulated card reader.
 
+config IPL_TAPE
+	bool "tape"
+
 config IPL_VM
 	bool "vm_reader"
 

arch/s390/Makefile

@@ -13,14 +13,28 @@
 # Copyright (C) 1994 by Linus Torvalds
 #
 
+ifdef CONFIG_ARCH_S390_31
 LDFLAGS		:= -m elf_s390
-OBJCOPYFLAGS	:= -O binary
-LDFLAGS_vmlinux := -e start
 LDFLAGS_BLOB	:= --format binary --oformat elf32-s390
+CFLAGS		+= -m31
+UTS_MACHINE	:= s390
+endif
+
+ifdef CONFIG_ARCH_S390X
+LDFLAGS		:= -m elf64_s390
+MODFLAGS	+= -fpic -D__PIC__
+LDFLAGS_BLOB	:= --format binary --oformat elf64-s390
+CFLAGS		+= -m64
+UTS_MACHINE	:= s390x
+endif
 
-CFLAGS += -pipe -fno-strength-reduce -finline-limit=10000 -Wno-sign-compare
+OBJCOPYFLAGS	:= -O binary
+LDFLAGS_vmlinux := -e start
+CFLAGS 		+= -pipe -fno-strength-reduce -finline-limit-10000 -Wno-sign-compare 
 
-head-y := arch/$(ARCH)/kernel/head.o arch/$(ARCH)/kernel/init_task.o
+head-$(CONFIG_ARCH_S390_31)	+= arch/$(ARCH)/kernel/head.o
+head-$(CONFIG_ARCH_S390X)	+= arch/$(ARCH)/kernel/head64.o
+head-y				+= arch/$(ARCH)/kernel/init_task.o
 
 core-y		+= arch/$(ARCH)/mm/ arch/$(ARCH)/kernel/
 libs-y		+= arch/$(ARCH)/lib/

arch/s390/boot/Makefile

@@ -2,18 +2,17 @@
 # Makefile for the linux s390-specific parts of the memory manager.
 #
 
-targets		:= image listing
-EXTRA_AFLAGS	:= -traditional
-quiet_cmd_listing = OBJDUMP $@
-      cmd_listing = $(OBJDUMP) --disassemble --disassemble-all \
-			       --disassemble-zeroes --reloc vmlinux > $@
+COMPILE_VERSION := __linux_compile_version_id__`hostname |  \
+			tr -c '[0-9A-Za-z]' '_'`__`date | \
+			tr -c '[0-9A-Za-z]' '_'`_t
 
-$(obj)/image: vmlinux FORCE
-	$(call if_changed,objcopy)
+EXTRA_CFLAGS  := -DCOMPILE_VERSION=$(COMPILE_VERSION) -gstabs -I .
+EXTRA_AFLAGS  := -traditional
 
-$(obj)/listing: vmlinux FORCE
-	$(call if_changed,listing)
+targets := image
 
+$(obj)/image: vmlinux FORCE
+	$(call if_changed,objcopy)
 
 install: $(CONFIGURE) $(obj)/image
 	sh -x $(obj)/install.sh $(KERNELRELEASE) $(obj)/image \

arch/s390/defconfig

@@ -2,9 +2,9 @@
 # Automatically generated make config: don't edit
 #
 CONFIG_MMU=y
-CONFIG_UID16=y
 CONFIG_RWSEM_XCHGADD_ALGORITHM=y
 CONFIG_ARCH_S390=y
+CONFIG_UID16=y
 
 #
 # Code maturity level options
@@ -36,9 +36,11 @@ CONFIG_KMOD=y
 #
 # Processor type and features
 #
+# CONFIG_ARCH_S390X is not set
+CONFIG_ARCH_S390_31=y
 CONFIG_SMP=y
-CONFIG_MATHEMU=y
 CONFIG_NR_CPUS=32
+CONFIG_MATHEMU=y
 
 #
 # I/O subsystem configuration

arch/s390/kernel/Makefile

@@ -2,17 +2,33 @@
 # Makefile for the linux kernel.
 #
 
-extra-y		:= head.o init_task.o
 EXTRA_AFLAGS	:= -traditional
 
-obj-y	:= entry.o bitmap.o traps.o time.o process.o \
+obj-y	:=  bitmap.o traps.o time.o process.o \
             setup.o sys_s390.o ptrace.o signal.o cpcmd.o ebcdic.o \
-            semaphore.o reipl.o s390_ext.o debug.o
+            semaphore.o s390_ext.o debug.o
+
+extra-$(CONFIG_ARCH_S390_31)	+= head.o 
+extra-$(CONFIG_ARCH_S390X)	+= head64.o 
+extra-y				+= init_task.o
 
 obj-$(CONFIG_MODULES)		+= s390_ksyms.o module.o
 obj-$(CONFIG_SMP)		+= smp.o
 
+obj-$(CONFIG_S390_SUPPORT)	+= compat_linux.o compat_signal.o \
+					compat_ioctl.o compat_wrapper.o \
+					compat_exec.o compat_exec_domain.o
+obj-$(CONFIG_BINFMT_ELF32)	+= binfmt_elf32.o
+
+obj-$(CONFIG_ARCH_S390_31)	+= entry.o reipl.o
+obj-$(CONFIG_ARCH_S390X)	+= entry64.o reipl64.o
+
+ifdef CONFIG_ARCH_S390X
+$(obj)%.o: $(patsubst arch/s390/%,arch/s390x/%,$(src))%.c
+	$(call if_changed_dep,cc_o_c)
+endif
+
 #
-# Kernel debugging
+# This is just to get the dependencies...
 #
-obj-$(CONFIG_REMOTE_DEBUG)	+= gdb-stub.o #gdb-low.o 
+binfmt_elf32.o:	$(TOPDIR)/fs/binfmt_elf.c

arch/s390/kernel/binfmt_elf32.c

+/*
+ * Support for 32-bit Linux for S390 ELF binaries.
+ *
+ * Copyright (C) 2000 IBM Deutschland Entwicklung GmbH, IBM Corporation
+ * Author(s): Gerhard Tonn (ton@de.ibm.com)
+ *
+ * Heavily inspired by the 32-bit Sparc compat code which is
+ * Copyright (C) 1995, 1996, 1997, 1998 David S. Miller (davem@redhat.com)
+ * Copyright (C) 1995, 1996, 1997, 1998 Jakub Jelinek   (jj@ultra.linux.cz)
+ */
+
+#define __ASMS390_ELF_H
+
+#include <linux/time.h>
+
+/*
+ * These are used to set parameters in the core dumps.
+ */
+#define ELF_CLASS	ELFCLASS32
+#define ELF_DATA	ELFDATA2MSB
+#define ELF_ARCH	EM_S390
+
+/*
+ * This is used to ensure we don't load something for the wrong architecture.
+ */
+#define elf_check_arch(x) \
+	(((x)->e_machine == EM_S390 || (x)->e_machine == EM_S390_OLD) \
+         && (x)->e_ident[EI_CLASS] == ELF_CLASS)
+
+/* ELF register definitions */
+#define NUM_GPRS      16
+#define NUM_FPRS      16
+#define NUM_ACRS      16    
+
+#define TASK31_SIZE		(0x80000000UL)
+
+/* For SVR4/S390 the function pointer to be registered with `atexit` is
+   passed in R14. */
+#define ELF_PLAT_INIT(_r, load_addr) \
+	do { \
+	_r->gprs[14] = 0; \
+	set_thread_flag(TIF_31BIT); \
+	} while(0)
+
+#define USE_ELF_CORE_DUMP
+#define ELF_EXEC_PAGESIZE       4096
+
+/* This is the location that an ET_DYN program is loaded if exec'ed.  Typical
+   use of this is to invoke "./ld.so someprog" to test out a new version of
+   the loader.  We need to make sure that it is out of the way of the program
+   that it will "exec", and that there is sufficient room for the brk.  */
+
+#define ELF_ET_DYN_BASE         (TASK31_SIZE / 3 * 2)
+
+/* Wow, the "main" arch needs arch dependent functions too.. :) */
+
+/* regs is struct pt_regs, pr_reg is elf_gregset_t (which is
+   now struct_user_regs, they are different) */
+
+#define ELF_CORE_COPY_REGS(pr_reg, regs)        \
+	{ \
+	int i; \
+	memcpy(&pr_reg.psw.mask, &regs->psw.mask, 4); \
+	memcpy(&pr_reg.psw.addr, ((char*)&regs->psw.addr)+4, 4); \
+	for(i=0; i<NUM_GPRS; i++) \
+		pr_reg.gprs[i] = regs->gprs[i]; \
+	for(i=0; i<NUM_ACRS; i++) \
+		pr_reg.acrs[i] = regs->acrs[i]; \
+	pr_reg.orig_gpr2 = regs->orig_gpr2; \
+	}
+
+
+
+/* This yields a mask that user programs can use to figure out what
+   instruction set this CPU supports. */
+
+#define ELF_HWCAP (0)
+
+/* This yields a string that ld.so will use to load implementation
+   specific libraries for optimization.  This is more specific in
+   intent than poking at uname or /proc/cpuinfo.
+
+   For the moment, we have only optimizations for the Intel generations,
+   but that could change... */
+
+#define ELF_PLATFORM (NULL)
+
+#define SET_PERSONALITY(ex, ibcs2)			\
+do {							\
+	if (ibcs2)                                      \
+		set_personality(PER_SVR4);              \
+	else if (current->personality != PER_LINUX32)   \
+		set_personality(PER_LINUX);             \
+} while (0)
+
+#include "compat_linux.h"
+
+typedef _s390_fp_regs32 elf_fpregset_t;
+
+typedef struct
+{
+	
+	_psw_t32	psw;
+	__u32		gprs[__NUM_GPRS]; 
+	__u32		acrs[__NUM_ACRS]; 
+	__u32		orig_gpr2;
+} s390_regs32;
+typedef s390_regs32 elf_gregset_t;
+
+#include <asm/processor.h>
+#include <linux/module.h>
+#include <linux/config.h>
+#include <linux/elfcore.h>
+#include <linux/binfmts.h>
+#include <linux/compat.h>
+
+int setup_arg_pages32(struct linux_binprm *bprm);
+
+#define elf_prstatus elf_prstatus32
+struct elf_prstatus32
+{
+	struct elf_siginfo pr_info;	/* Info associated with signal */
+	short	pr_cursig;		/* Current signal */
+	u32	pr_sigpend;	/* Set of pending signals */
+	u32	pr_sighold;	/* Set of held signals */
+	pid_t	pr_pid;
+	pid_t	pr_ppid;
+	pid_t	pr_pgrp;
+	pid_t	pr_sid;
+	struct compat_timeval pr_utime;	/* User time */
+	struct compat_timeval pr_stime;	/* System time */
+	struct compat_timeval pr_cutime;	/* Cumulative user time */
+	struct compat_timeval pr_cstime;	/* Cumulative system time */
+	elf_gregset_t pr_reg;	/* GP registers */
+	int pr_fpvalid;		/* True if math co-processor being used.  */
+};
+
+#define elf_prpsinfo elf_prpsinfo32
+struct elf_prpsinfo32
+{
+	char	pr_state;	/* numeric process state */
+	char	pr_sname;	/* char for pr_state */
+	char	pr_zomb;	/* zombie */
+	char	pr_nice;	/* nice val */
+	u32	pr_flag;	/* flags */
+	u16	pr_uid;
+	u16	pr_gid;
+	pid_t	pr_pid, pr_ppid, pr_pgrp, pr_sid;
+	/* Lots missing */
+	char	pr_fname[16];	/* filename of executable */
+	char	pr_psargs[ELF_PRARGSZ];	/* initial part of arg list */
+};
+
+#include <linux/highuid.h>
+
+#undef NEW_TO_OLD_UID
+#undef NEW_TO_OLD_GID
+#define NEW_TO_OLD_UID(uid) ((uid) > 65535) ? (u16)overflowuid : (u16)(uid)
+#define NEW_TO_OLD_GID(gid) ((gid) > 65535) ? (u16)overflowgid : (u16)(gid) 
+
+#define elf_addr_t	u32
+/*
+#define init_elf_binfmt init_elf32_binfmt
+*/
+#undef CONFIG_BINFMT_ELF
+#ifdef CONFIG_BINFMT_ELF32
+#define CONFIG_BINFMT_ELF CONFIG_BINFMT_ELF32
+#endif
+#undef CONFIG_BINFMT_ELF_MODULE
+#ifdef CONFIG_BINFMT_ELF32_MODULE
+#define CONFIG_BINFMT_ELF_MODULE CONFIG_BINFMT_ELF32_MODULE
+#endif
+
+#undef start_thread
+#define start_thread                    start_thread31 
+#define setup_arg_pages(bprm)           setup_arg_pages32(bprm)
+#define elf_map				elf_map32
+
+MODULE_DESCRIPTION("Binary format loader for compatibility with 32bit Linux for S390 binaries,"
+                   " Copyright 2000 IBM Corporation"); 
+MODULE_AUTHOR("Gerhard Tonn <ton@de.ibm.com>");
+
+#undef MODULE_DESCRIPTION
+#undef MODULE_AUTHOR
+
+#define jiffies_to_timeval jiffies_to_compat_timeval
+static __inline__ void
+jiffies_to_compat_timeval(unsigned long jiffies, struct compat_timeval *value)
+{
+	value->tv_usec = (jiffies % HZ) * (1000000L / HZ);
+	value->tv_sec = jiffies / HZ;
+}
+
+#include "../../../fs/binfmt_elf.c"
+
+static unsigned long
+elf_map32 (struct file *filep, unsigned long addr, struct elf_phdr *eppnt, int prot, int type)
+{
+	unsigned long map_addr;
+
+	if (!addr) 
+		addr = 0x40000000; 
+
+	if (prot & PROT_READ) 
+		prot |= PROT_EXEC; 
+
+	down_write(&current->mm->mmap_sem);
+	map_addr = do_mmap(filep, ELF_PAGESTART(addr),
+			   eppnt->p_filesz + ELF_PAGEOFFSET(eppnt->p_vaddr),
+			   prot, type,
+			   eppnt->p_offset - ELF_PAGEOFFSET(eppnt->p_vaddr));
+	up_write(&current->mm->mmap_sem);
+	return(map_addr);
+}

arch/s390/kernel/compat_exec.c

+/*
+ * Support for 32-bit Linux for S390 ELF binaries.
+ *
+ * Copyright (C) 2000 IBM Deutschland Entwicklung GmbH, IBM Corporation
+ * Author(s): Gerhard Tonn (ton@de.ibm.com)
+ *
+ * Separated from binfmt_elf32.c to reduce exports for module enablement.
+ *
+ */
+
+#include <linux/config.h>
+#include <linux/slab.h>
+#include <linux/file.h>
+#include <linux/mman.h>
+#include <linux/a.out.h>
+#include <linux/stat.h>
+#include <linux/fcntl.h>
+#include <linux/smp_lock.h>
+#include <linux/init.h>
+#include <linux/pagemap.h>
+#include <linux/highmem.h>
+#include <linux/spinlock.h>
+#include <linux/binfmts.h>
+#include <linux/module.h>
+
+#include <asm/uaccess.h>
+#include <asm/pgalloc.h>
+#include <asm/mmu_context.h>
+
+#ifdef CONFIG_KMOD
+#include <linux/kmod.h>
+#endif
+
+
+extern void put_dirty_page(struct task_struct * tsk, struct page *page, unsigned long address);
+
+#undef STACK_TOP
+#define STACK_TOP TASK31_SIZE
+
+int setup_arg_pages32(struct linux_binprm *bprm)
+{
+	unsigned long stack_base;
+	struct vm_area_struct *mpnt;
+	struct mm_struct *mm = current->mm;
+	int i;
+
+	stack_base = STACK_TOP - MAX_ARG_PAGES*PAGE_SIZE;
+	mm->arg_start = bprm->p + stack_base;
+
+	bprm->p += stack_base;
+	if (bprm->loader)
+		bprm->loader += stack_base;
+	bprm->exec += stack_base;
+
+	mpnt = kmem_cache_alloc(vm_area_cachep, SLAB_KERNEL);
+	if (!mpnt) 
+		return -ENOMEM; 
+	
+	if (!vm_enough_memory((STACK_TOP - (PAGE_MASK & (unsigned long) bprm->p))>>PAGE_SHIFT)) {
+		kmem_cache_free(vm_area_cachep, mpnt);
+		return -ENOMEM;
+	}
+
+	down_write(&mm->mmap_sem);
+	{
+		mpnt->vm_mm = mm;
+		mpnt->vm_start = PAGE_MASK & (unsigned long) bprm->p;
+		mpnt->vm_end = STACK_TOP;
+		mpnt->vm_page_prot = PAGE_COPY;
+		mpnt->vm_flags = VM_STACK_FLAGS;
+		mpnt->vm_ops = NULL;
+		mpnt->vm_pgoff = 0;
+		mpnt->vm_file = NULL;
+		INIT_LIST_HEAD(&mpnt->shared);
+		mpnt->vm_private_data = (void *) 0;
+		insert_vm_struct(mm, mpnt);
+		mm->total_vm = (mpnt->vm_end - mpnt->vm_start) >> PAGE_SHIFT;
+	} 
+
+	for (i = 0 ; i < MAX_ARG_PAGES ; i++) {
+		struct page *page = bprm->page[i];
+		if (page) {
+			bprm->page[i] = NULL;
+			put_dirty_page(current,page,stack_base);
+		}
+		stack_base += PAGE_SIZE;
+	}
+	up_write(&mm->mmap_sem);
+	
+	return 0;
+}
+
+EXPORT_SYMBOL(setup_arg_pages32);

arch/s390/kernel/compat_exec_domain.c

+/*
+ * Support for 32-bit Linux for S390 personality.
+ *
+ * Copyright (C) 2000 IBM Deutschland Entwicklung GmbH, IBM Corporation
+ * Author(s): Gerhard Tonn (ton@de.ibm.com)
+ *
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/personality.h>
+#include <linux/sched.h>
+
+struct exec_domain s390_exec_domain;
+
+static int __init
+s390_init (void)
+{
+	s390_exec_domain.name = "Linux/s390";
+	s390_exec_domain.handler = NULL;
+	s390_exec_domain.pers_low = PER_LINUX32;
+	s390_exec_domain.pers_high = PER_LINUX32;
+	s390_exec_domain.signal_map = default_exec_domain.signal_map;
+	s390_exec_domain.signal_invmap = default_exec_domain.signal_invmap;
+	register_exec_domain(&s390_exec_domain);
+	return 0;
+}
+
+__initcall(s390_init);