sparc: prepare kernel/ for unification

o sparc32 files with identical names to sparc64 renamed to <name>_32.S
o introduced a few Kconfig helpers to simplify Makefile logic
o refactored Makefile to prepare for unification
  - use obj-$(CONFIG_SPARC32) for sparc32 specific files
  - use <name>_$(BITS) for files where sparc64 has a _64 variant
  - sparc64 directly include a few files where sparc32 builds them,
    refer to these files directly (no BITS)
  - sneaked in -Werror as used by sparc64
o modified sparc/Makefile to use the new names for head/init_task

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 466 insertions, 0 deletions

diff --git a/arch/sparc/kernel/sys_sparc_32.c b/arch/sparc/kernel/sys_sparc_32.c
new file mode 100644
index 00000000000..03035c852a4
--- /dev/null
+++ b/arch/sparc/kernel/sys_sparc_32.c
@@ -0,0 +1,466 @@
+/* linux/arch/sparc/kernel/sys_sparc.c
+ *
+ * This file contains various random system calls that
+ * have a non-standard calling sequence on the Linux/sparc
+ * platform.
+ */
+
+#include <linux/errno.h>
+#include <linux/types.h>
+#include <linux/sched.h>
+#include <linux/mm.h>
+#include <linux/fs.h>
+#include <linux/file.h>
+#include <linux/sem.h>
+#include <linux/msg.h>
+#include <linux/shm.h>
+#include <linux/stat.h>
+#include <linux/syscalls.h>
+#include <linux/mman.h>
+#include <linux/utsname.h>
+#include <linux/smp.h>
+#include <linux/smp_lock.h>
+#include <linux/ipc.h>
+
+#include <asm/uaccess.h>
+#include <asm/unistd.h>
+
+/* #define DEBUG_UNIMP_SYSCALL */
+
+/* XXX Make this per-binary type, this way we can detect the type of
+ * XXX a binary.  Every Sparc executable calls this very early on.
+ */
+asmlinkage unsigned long sys_getpagesize(void)
+{
+	return PAGE_SIZE; /* Possibly older binaries want 8192 on sun4's? */
+}
+
+#define COLOUR_ALIGN(addr)      (((addr)+SHMLBA-1)&~(SHMLBA-1))
+
+unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags)
+{
+	struct vm_area_struct * vmm;
+
+	if (flags & MAP_FIXED) {
+		/* We do not accept a shared mapping if it would violate
+		 * cache aliasing constraints.
+		 */
+		if ((flags & MAP_SHARED) && (addr & (SHMLBA - 1)))
+			return -EINVAL;
+		return addr;
+	}
+
+	/* See asm-sparc/uaccess.h */
+	if (len > TASK_SIZE - PAGE_SIZE)
+		return -ENOMEM;
+	if (ARCH_SUN4C && len > 0x20000000)
+		return -ENOMEM;
+	if (!addr)
+		addr = TASK_UNMAPPED_BASE;
+
+	if (flags & MAP_SHARED)
+		addr = COLOUR_ALIGN(addr);
+	else
+		addr = PAGE_ALIGN(addr);
+
+	for (vmm = find_vma(current->mm, addr); ; vmm = vmm->vm_next) {
+		/* At this point:  (!vmm || addr < vmm->vm_end). */
+		if (ARCH_SUN4C && addr < 0xe0000000 && 0x20000000 - len < addr) {
+			addr = PAGE_OFFSET;
+			vmm = find_vma(current->mm, PAGE_OFFSET);
+		}
+		if (TASK_SIZE - PAGE_SIZE - len < addr)
+			return -ENOMEM;
+		if (!vmm || addr + len <= vmm->vm_start)
+			return addr;
+		addr = vmm->vm_end;
+		if (flags & MAP_SHARED)
+			addr = COLOUR_ALIGN(addr);
+	}
+}
+
+asmlinkage unsigned long sparc_brk(unsigned long brk)
+{
+	if(ARCH_SUN4C) {
+		if ((brk & 0xe0000000) != (current->mm->brk & 0xe0000000))
+			return current->mm->brk;
+	}
+	return sys_brk(brk);
+}
+
+/*
+ * sys_pipe() is the normal C calling standard for creating
+ * a pipe. It's not the way unix traditionally does this, though.
+ */
+asmlinkage int sparc_pipe(struct pt_regs *regs)
+{
+	int fd[2];
+	int error;
+
+	error = do_pipe_flags(fd, 0);
+	if (error)
+		goto out;
+	regs->u_regs[UREG_I1] = fd[1];
+	error = fd[0];
+out:
+	return error;
+}
+
+/*
+ * sys_ipc() is the de-multiplexer for the SysV IPC calls..
+ *
+ * This is really horribly ugly.
+ */
+
+asmlinkage int sys_ipc (uint call, int first, int second, int third, void __user *ptr, long fifth)
+{
+	int version, err;
+
+	version = call >> 16; /* hack for backward compatibility */
+	call &= 0xffff;
+
+	if (call <= SEMCTL)
+		switch (call) {
+		case SEMOP:
+			err = sys_semtimedop (first, (struct sembuf __user *)ptr, second, NULL);
+			goto out;
+		case SEMTIMEDOP:
+			err = sys_semtimedop (first, (struct sembuf __user *)ptr, second, (const struct timespec __user *) fifth);
+			goto out;
+		case SEMGET:
+			err = sys_semget (first, second, third);
+			goto out;
+		case SEMCTL: {
+			union semun fourth;
+			err = -EINVAL;
+			if (!ptr)
+				goto out;
+			err = -EFAULT;
+			if (get_user(fourth.__pad,
+				     (void __user * __user *)ptr))
+				goto out;
+			err = sys_semctl (first, second, third, fourth);
+			goto out;
+			}
+		default:
+			err = -ENOSYS;
+			goto out;
+		}
+	if (call <= MSGCTL) 
+		switch (call) {
+		case MSGSND:
+			err = sys_msgsnd (first, (struct msgbuf __user *) ptr, 
+					  second, third);
+			goto out;
+		case MSGRCV:
+			switch (version) {
+			case 0: {
+				struct ipc_kludge tmp;
+				err = -EINVAL;
+				if (!ptr)
+					goto out;
+				err = -EFAULT;
+				if (copy_from_user(&tmp, (struct ipc_kludge __user *) ptr, sizeof (tmp)))
+					goto out;
+				err = sys_msgrcv (first, tmp.msgp, second, tmp.msgtyp, third);
+				goto out;
+				}
+			case 1: default:
+				err = sys_msgrcv (first,
+						  (struct msgbuf __user *) ptr,
+						  second, fifth, third);
+				goto out;
+			}
+		case MSGGET:
+			err = sys_msgget ((key_t) first, second);
+			goto out;
+		case MSGCTL:
+			err = sys_msgctl (first, second, (struct msqid_ds __user *) ptr);
+			goto out;
+		default:
+			err = -ENOSYS;
+			goto out;
+		}
+	if (call <= SHMCTL) 
+		switch (call) {
+		case SHMAT:
+			switch (version) {
+			case 0: default: {
+				ulong raddr;
+				err = do_shmat (first, (char __user *) ptr, second, &raddr);
+				if (err)
+					goto out;
+				err = -EFAULT;
+				if (put_user (raddr, (ulong __user *) third))
+					goto out;
+				err = 0;
+				goto out;
+				}
+			case 1:	/* iBCS2 emulator entry point */
+				err = -EINVAL;
+				goto out;
+			}
+		case SHMDT: 
+			err = sys_shmdt ((char __user *)ptr);
+			goto out;
+		case SHMGET:
+			err = sys_shmget (first, second, third);
+			goto out;
+		case SHMCTL:
+			err = sys_shmctl (first, second, (struct shmid_ds __user *) ptr);
+			goto out;
+		default:
+			err = -ENOSYS;
+			goto out;
+		}
+	else
+		err = -ENOSYS;
+out:
+	return err;
+}
+
+int sparc_mmap_check(unsigned long addr, unsigned long len)
+{
+	if (ARCH_SUN4C &&
+	    (len > 0x20000000 ||
+	     (addr < 0xe0000000 && addr + len > 0x20000000)))
+		return -EINVAL;
+
+	/* See asm-sparc/uaccess.h */
+	if (len > TASK_SIZE - PAGE_SIZE || addr + len > TASK_SIZE - PAGE_SIZE)
+		return -EINVAL;
+
+	return 0;
+}
+
+/* Linux version of mmap */
+static unsigned long do_mmap2(unsigned long addr, unsigned long len,
+	unsigned long prot, unsigned long flags, unsigned long fd,
+	unsigned long pgoff)
+{
+	struct file * file = NULL;
+	unsigned long retval = -EBADF;
+
+	if (!(flags & MAP_ANONYMOUS)) {
+		file = fget(fd);
+		if (!file)
+			goto out;
+	}
+
+	len = PAGE_ALIGN(len);
+	flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
+
+	down_write(&current->mm->mmap_sem);
+	retval = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
+	up_write(&current->mm->mmap_sem);
+
+	if (file)
+		fput(file);
+out:
+	return retval;
+}
+
+asmlinkage unsigned long sys_mmap2(unsigned long addr, unsigned long len,
+	unsigned long prot, unsigned long flags, unsigned long fd,
+	unsigned long pgoff)
+{
+	/* Make sure the shift for mmap2 is constant (12), no matter what PAGE_SIZE
+	   we have. */
+	return do_mmap2(addr, len, prot, flags, fd, pgoff >> (PAGE_SHIFT - 12));
+}
+
+asmlinkage unsigned long sys_mmap(unsigned long addr, unsigned long len,
+	unsigned long prot, unsigned long flags, unsigned long fd,
+	unsigned long off)
+{
+	return do_mmap2(addr, len, prot, flags, fd, off >> PAGE_SHIFT);
+}
+
+long sparc_remap_file_pages(unsigned long start, unsigned long size,
+			   unsigned long prot, unsigned long pgoff,
+			   unsigned long flags)
+{
+	/* This works on an existing mmap so we don't need to validate
+	 * the range as that was done at the original mmap call.
+	 */
+	return sys_remap_file_pages(start, size, prot,
+				    (pgoff >> (PAGE_SHIFT - 12)), flags);
+}
+
+extern unsigned long do_mremap(unsigned long addr,
+	unsigned long old_len, unsigned long new_len,
+	unsigned long flags, unsigned long new_addr);
+                
+asmlinkage unsigned long sparc_mremap(unsigned long addr,
+	unsigned long old_len, unsigned long new_len,
+	unsigned long flags, unsigned long new_addr)
+{
+	unsigned long ret = -EINVAL;
+
+	if (unlikely(sparc_mmap_check(addr, old_len)))
+		goto out;
+	if (unlikely(sparc_mmap_check(new_addr, new_len)))
+		goto out;
+	down_write(&current->mm->mmap_sem);
+	ret = do_mremap(addr, old_len, new_len, flags, new_addr);
+	up_write(&current->mm->mmap_sem);
+out:
+	return ret;       
+}
+
+/* we come to here via sys_nis_syscall so it can setup the regs argument */
+asmlinkage unsigned long
+c_sys_nis_syscall (struct pt_regs *regs)
+{
+	static int count = 0;
+
+	if (count++ > 5)
+		return -ENOSYS;
+	printk ("%s[%d]: Unimplemented SPARC system call %d\n",
+		current->comm, task_pid_nr(current), (int)regs->u_regs[1]);
+#ifdef DEBUG_UNIMP_SYSCALL	
+	show_regs (regs);
+#endif
+	return -ENOSYS;
+}
+
+/* #define DEBUG_SPARC_BREAKPOINT */
+
+asmlinkage void
+sparc_breakpoint (struct pt_regs *regs)
+{
+	siginfo_t info;
+
+	lock_kernel();
+#ifdef DEBUG_SPARC_BREAKPOINT
+        printk ("TRAP: Entering kernel PC=%x, nPC=%x\n", regs->pc, regs->npc);
+#endif
+	info.si_signo = SIGTRAP;
+	info.si_errno = 0;
+	info.si_code = TRAP_BRKPT;
+	info.si_addr = (void __user *)regs->pc;
+	info.si_trapno = 0;
+	force_sig_info(SIGTRAP, &info, current);
+
+#ifdef DEBUG_SPARC_BREAKPOINT
+	printk ("TRAP: Returning to space: PC=%x nPC=%x\n", regs->pc, regs->npc);
+#endif
+	unlock_kernel();
+}
+
+asmlinkage int
+sparc_sigaction (int sig, const struct old_sigaction __user *act,
+		 struct old_sigaction __user *oact)
+{
+	struct k_sigaction new_ka, old_ka;
+	int ret;
+
+	WARN_ON_ONCE(sig >= 0);
+	sig = -sig;
+
+	if (act) {
+		unsigned long mask;
+
+		if (!access_ok(VERIFY_READ, act, sizeof(*act)) ||
+		    __get_user(new_ka.sa.sa_handler, &act->sa_handler) ||
+		    __get_user(new_ka.sa.sa_restorer, &act->sa_restorer))
+			return -EFAULT;
+		__get_user(new_ka.sa.sa_flags, &act->sa_flags);
+		__get_user(mask, &act->sa_mask);
+		siginitset(&new_ka.sa.sa_mask, mask);
+		new_ka.ka_restorer = NULL;
+	}
+
+	ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
+
+	if (!ret && oact) {
+		/* In the clone() case we could copy half consistent
+		 * state to the user, however this could sleep and
+		 * deadlock us if we held the signal lock on SMP.  So for
+		 * now I take the easy way out and do no locking.
+		 */
+		if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) ||
+		    __put_user(old_ka.sa.sa_handler, &oact->sa_handler) ||
+		    __put_user(old_ka.sa.sa_restorer, &oact->sa_restorer))
+			return -EFAULT;
+		__put_user(old_ka.sa.sa_flags, &oact->sa_flags);
+		__put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask);
+	}
+
+	return ret;
+}
+
+asmlinkage long
+sys_rt_sigaction(int sig,
+		 const struct sigaction __user *act,
+		 struct sigaction __user *oact,
+		 void __user *restorer,
+		 size_t sigsetsize)
+{
+	struct k_sigaction new_ka, old_ka;
+	int ret;
+
+	/* XXX: Don't preclude handling different sized sigset_t's.  */
+	if (sigsetsize != sizeof(sigset_t))
+		return -EINVAL;
+
+	if (act) {
+		new_ka.ka_restorer = restorer;
+		if (copy_from_user(&new_ka.sa, act, sizeof(*act)))
+			return -EFAULT;
+	}
+
+	ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
+
+	if (!ret && oact) {
+		if (copy_to_user(oact, &old_ka.sa, sizeof(*oact)))
+			return -EFAULT;
+	}
+
+	return ret;
+}
+
+asmlinkage int sys_getdomainname(char __user *name, int len)
+{
+ 	int nlen, err;
+ 	
+	if (len < 0)
+		return -EINVAL;
+
+ 	down_read(&uts_sem);
+ 	
+	nlen = strlen(utsname()->domainname) + 1;
+	err = -EINVAL;
+	if (nlen > len)
+		goto out;
+
+	err = -EFAULT;
+	if (!copy_to_user(name, utsname()->domainname, nlen))
+		err = 0;
+
+out:
+	up_read(&uts_sem);
+	return err;
+}
+
+/*
+ * Do a system call from kernel instead of calling sys_execve so we
+ * end up with proper pt_regs.
+ */
+int kernel_execve(const char *filename, char *const argv[], char *const envp[])
+{
+	long __res;
+	register long __g1 __asm__ ("g1") = __NR_execve;
+	register long __o0 __asm__ ("o0") = (long)(filename);
+	register long __o1 __asm__ ("o1") = (long)(argv);
+	register long __o2 __asm__ ("o2") = (long)(envp);
+	asm volatile ("t 0x10\n\t"
+		      "bcc 1f\n\t"
+		      "mov %%o0, %0\n\t"
+		      "sub %%g0, %%o0, %0\n\t"
+		      "1:\n\t"
+		      : "=r" (__res), "=&r" (__o0)
+		      : "1" (__o0), "r" (__o1), "r" (__o2), "r" (__g1)
+		      : "cc");
+	return __res;
+}