[PATCH 56/58] microblaze_v5: sys_microblaze.c

From: monstr
Date: Tue Jul 08 2008 - 08:08:07 EST

From: Michal Simek <monstr@xxxxxxxxx>

Acked-by: Stephen Neuendorffer <stephen.neuendorffer@xxxxxxxxxx>
Signed-off-by: Michal Simek <monstr@xxxxxxxxx>
---
arch/microblaze/kernel/sys_microblaze.c | 272 +++++++++++++++++++++++++++++++
1 files changed, 272 insertions(+), 0 deletions(-)
create mode 100644 arch/microblaze/kernel/sys_microblaze.c

diff --git a/arch/microblaze/kernel/sys_microblaze.c b/arch/microblaze/kernel/sys_microblaze.c
new file mode 100644
index 0000000..def5ff9
--- /dev/null
+++ b/arch/microblaze/kernel/sys_microblaze.c
@@ -0,0 +1,272 @@
+/*
+ * Copyright (C) 2007 PetaLogix
+ * John Williams <john.williams@xxxxxxxxxxxxx>
+ * Copyright (C) 2006 Atmark Techno, Inc.
+ * Yasushi SHOJI <yashi@xxxxxxxxxxxxxxxxx>
+ * Tetsuya OHKAWA <tetsuya@xxxxxxxxxxxxxxxxx>
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ */
+
+#include <linux/errno.h>
+#include <linux/mm.h>
+#include <linux/smp.h>
+#include <linux/smp_lock.h>
+#include <linux/syscalls.h>
+#include <linux/sem.h>
+#include <linux/msg.h>
+#include <linux/shm.h>
+#include <linux/stat.h>
+#include <linux/mman.h>
+#include <linux/sys.h>
+#include <linux/ipc.h>
+#include <linux/utsname.h>
+#include <linux/file.h>
+#include <linux/module.h>
+#include <linux/err.h>
+#include <linux/fs.h>
+#include <linux/ipc.h>
+#include <linux/semaphore.h>
+
+#include <asm/uaccess.h>
+#include <asm/unistd.h>
+
+/*
+ * sys_ipc() is the de-multiplexer for the SysV IPC calls..
+ *
+ * This is really horribly ugly. This will be remove with new toolchain.
+ */
+int
+sys_ipc(uint call, int first, int second, int third, void *ptr, long fifth)
+{
+ int version, ret;
+
+ version = call >> 16; /* hack for backward compatibility */
+ call &= 0xffff;
+
+ ret = -EINVAL;
+ switch (call) {
+ case SEMOP:
+ ret = sys_semop(first, (struct sembuf *)ptr, second);
+ break;
+ case SEMGET:
+ ret = sys_semget(first, second, third);
+ break;
+ case SEMCTL:
+ {
+ union semun fourth;
+
+ if (!ptr)
+ break;
+ if ((ret = access_ok(VERIFY_READ, ptr,
+ sizeof(long)) ? 0 : -EFAULT)
+ || (ret = get_user(fourth.__pad, (void **)ptr)))
+ break;
+ ret = sys_semctl(first, second, third, fourth);
+ break;
+ }
+ case MSGSND:
+ ret = sys_msgsnd(first, (struct msgbuf *) ptr, second, third);
+ break;
+ case MSGRCV:
+ switch (version) {
+ case 0: {
+ struct ipc_kludge tmp;
+
+ if (!ptr)
+ break;
+ if ((ret = access_ok(VERIFY_READ, ptr,
+ sizeof(tmp)) ? 0 : -EFAULT)
+ || (ret = copy_from_user(&tmp,
+ (struct ipc_kludge *) ptr,
+ sizeof(tmp))))
+ break;
+ ret = sys_msgrcv(first, tmp.msgp, second, tmp.msgtyp,
+ third);
+ break;
+ }
+ default:
+ ret = sys_msgrcv(first, (struct msgbuf *) ptr,
+ second, fifth, third);
+ break;
+ }
+ break;
+ case MSGGET:
+ ret = sys_msgget((key_t) first, second);
+ break;
+ case MSGCTL:
+ ret = sys_msgctl(first, second, (struct msqid_ds *) ptr);
+ break;
+ case SHMAT:
+ switch (version) {
+ default: {
+ ulong raddr;
+
+ if ((ret = access_ok(VERIFY_WRITE, (ulong *) third,
+ sizeof(ulong)) ? 0 : -EFAULT))
+ break;
+ ret = do_shmat(first, (char *) ptr, second, &raddr);
+ if (ret)
+ break;
+ ret = put_user(raddr, (ulong *) third);
+ break;
+ }
+ case 1: /* iBCS2 emulator entry point */
+ if (!segment_eq(get_fs(), get_ds()))
+ break;
+ ret = do_shmat(first, (char *) ptr, second,
+ (ulong *) third);
+ break;
+ }
+ break;
+ case SHMDT:
+ ret = sys_shmdt((char *)ptr);
+ break;
+ case SHMGET:
+ ret = sys_shmget(first, second, third);
+ break;
+ case SHMCTL:
+ ret = sys_shmctl(first, second, (struct shmid_ds *) ptr);
+ break;
+ }
+
+ return ret;
+}
+
+long execve(const char *filename, char **argv, char **envp)
+{
+ struct pt_regs regs;
+ int ret;
+
+ memset(&regs, 0, sizeof(struct pt_regs));
+ local_save_flags(regs.msr);
+ ret = do_execve((char *)filename, (char __user * __user *)argv,
+ (char __user * __user *)envp, &regs);
+
+ if (ret < 0)
+ goto out;
+
+ /*
+ * Save argc to the register structure for userspace.
+ */
+ regs.r5 = ret; /* FIXME */
+
+ /*
+ * We were successful. We won't be returning to our caller, but
+ * instead to user space by manipulating the kernel stack.
+ */
+ asm volatile ("addk r5, r0, %0 \n\t"
+ "addk r6, r0, %1 \n\t"
+ /* copy regs to top of stack */
+ "brlid r15, memmove \n\t"
+ "addik r7, r0, %2 \n\t"
+ "brid ret_to_user \n\t"
+ /* reposition stack pointer */
+ "addk r1, r0, r3 \n\t"
+ :
+ : "r" (task_pt_regs(current)),
+ "r" (&regs),
+ "i" (sizeof(regs))
+ : "r1", "r3", "r5", "r6", "r7", "r15", "memory");
+
+out:
+ return ret;
+}
+EXPORT_SYMBOL(execve);
+
+asmlinkage int sys_vfork(struct pt_regs *regs)
+{
+ return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, regs->r1,
+ regs, 0, NULL, NULL);
+}
+
+asmlinkage int sys_clone(int flags, unsigned long stack, struct pt_regs *regs)
+{
+ if (!stack)
+ stack = regs->r1;
+ return do_fork(flags, stack, regs, 0, NULL, NULL);
+}
+
+asmlinkage int sys_execve(char __user *filenamei, char __user * __user *argv,
+ char __user * __user *envp, struct pt_regs *regs)
+{
+ int error;
+ char *filename;
+
+ filename = getname(filenamei);
+ error = PTR_ERR(filename);
+ if (IS_ERR(filename))
+ goto out;
+ error = do_execve(filename, argv, envp, regs);
+ putname(filename);
+out:
+ return error;
+}
+
+static inline unsigned long
+do_mmap2(unsigned long addr, size_t len,
+ unsigned long prot, unsigned long flags,
+ unsigned long fd, unsigned long pgoff)
+{
+ struct file *file = NULL;
+ int ret = -EBADF;
+
+ flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
+ if (!(flags & MAP_ANONYMOUS))
+ if (!(file = fget(fd))) {
+ printk(KERN_INFO "no fd in mmap\r\n");
+ goto out;
+ }
+
+ down_write(&current->mm->mmap_sem);
+ ret = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
+ up_write(&current->mm->mmap_sem);
+ if (file)
+ fput(file);
+out:
+ return ret;
+}
+
+unsigned long sys_mmap2(unsigned long addr, size_t len,
+ unsigned long prot, unsigned long flags,
+ unsigned long fd, unsigned long pgoff)
+{
+ return do_mmap2(addr, len, prot, flags, fd, pgoff);
+}
+
+unsigned long sys_mmap(unsigned long addr, size_t len,
+ unsigned long prot, unsigned long flags,
+ unsigned long fd, off_t offset)
+{
+ int err = -EINVAL;
+
+ if (offset & ~PAGE_MASK) {
+ printk(KERN_INFO "no pagemask in mmap\r\n");
+ goto out;
+ }
+
+ err = do_mmap2(addr, len, prot, flags, fd, offset >> PAGE_SHIFT);
+out:
+ 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[])
+{
+ register const char *__a __asm__("r5") = filename;
+ register const void *__b __asm__("r6") = argv;
+ register const void *__c __asm__("r7") = envp;
+ register unsigned long __syscall __asm__("r12") = __NR_execve;
+ register unsigned long __ret __asm__("r3");
+ __asm__ __volatile__ ("brki r14, 0x8"
+ : "=r" (__ret), "=r" (__syscall)
+ : "1" (__syscall), "r" (__a), "r" (__b), "r" (__c)
+ : "r4", "r8", "r9",
+ "r10", "r11", "r14", "cc", "memory");
+ return __ret;
+}
--
1.5.4.GIT

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