diff options
Diffstat (limited to 'arch/um/sys-x86_64/syscalls.c')
-rw-r--r-- | arch/um/sys-x86_64/syscalls.c | 66 |
1 files changed, 32 insertions, 34 deletions
diff --git a/arch/um/sys-x86_64/syscalls.c b/arch/um/sys-x86_64/syscalls.c index bbcab773b23d..58ae06562b4a 100644 --- a/arch/um/sys-x86_64/syscalls.c +++ b/arch/um/sys-x86_64/syscalls.c @@ -1,36 +1,34 @@ /* + * Copyright (C) 2003 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com) * Copyright 2003 PathScale, Inc. * * Licensed under the GPL */ #include "linux/linkage.h" -#include "linux/slab.h" -#include "linux/shm.h" -#include "linux/utsname.h" #include "linux/personality.h" -#include "asm/uaccess.h" -#define __FRAME_OFFSETS -#include "asm/ptrace.h" -#include "asm/unistd.h" +#include "linux/utsname.h" #include "asm/prctl.h" /* XXX This should get the constants from libc */ -#include "kern.h" +#include "asm/uaccess.h" #include "os.h" asmlinkage long sys_uname64(struct new_utsname __user * name) { int err; + down_read(&uts_sem); err = copy_to_user(name, utsname(), sizeof (*name)); up_read(&uts_sem); + if (personality(current->personality) == PER_LINUX32) err |= copy_to_user(&name->machine, "i686", 5); + return err ? -EFAULT : 0; } long arch_prctl(struct task_struct *task, int code, unsigned long __user *addr) { - unsigned long *ptr = addr, tmp; + unsigned long *ptr = addr, tmp; long ret; int pid = task->mm->context.skas.id.u.pid; @@ -47,42 +45,42 @@ long arch_prctl(struct task_struct *task, int code, unsigned long __user *addr) * arch_prctl is run on the host, then the registers are read * back. */ - switch(code){ + switch (code) { case ARCH_SET_FS: case ARCH_SET_GS: - restore_registers(pid, ¤t->thread.regs.regs); - break; - case ARCH_GET_FS: - case ARCH_GET_GS: - /* - * With these two, we read to a local pointer and - * put_user it to the userspace pointer that we were - * given. If addr isn't valid (because it hasn't been - * faulted in or is just bogus), we want put_user to - * fault it in (or return -EFAULT) instead of having - * the host return -EFAULT. - */ - ptr = &tmp; - } + restore_registers(pid, ¤t->thread.regs.regs); + break; + case ARCH_GET_FS: + case ARCH_GET_GS: + /* + * With these two, we read to a local pointer and + * put_user it to the userspace pointer that we were + * given. If addr isn't valid (because it hasn't been + * faulted in or is just bogus), we want put_user to + * fault it in (or return -EFAULT) instead of having + * the host return -EFAULT. + */ + ptr = &tmp; + } - ret = os_arch_prctl(pid, code, ptr); - if(ret) - return ret; + ret = os_arch_prctl(pid, code, ptr); + if (ret) + return ret; - switch(code){ + switch (code) { case ARCH_SET_FS: current->thread.arch.fs = (unsigned long) ptr; save_registers(pid, ¤t->thread.regs.regs); break; case ARCH_SET_GS: - save_registers(pid, ¤t->thread.regs.regs); + save_registers(pid, ¤t->thread.regs.regs); break; case ARCH_GET_FS: ret = put_user(tmp, addr); - break; + break; case ARCH_GET_GS: ret = put_user(tmp, addr); - break; + break; } return ret; @@ -109,8 +107,8 @@ long sys_clone(unsigned long clone_flags, unsigned long newsp, void arch_switch_to(struct task_struct *from, struct task_struct *to) { - if((to->thread.arch.fs == 0) || (to->mm == NULL)) - return; + if ((to->thread.arch.fs == 0) || (to->mm == NULL)) + return; - arch_prctl(to, ARCH_SET_FS, (void __user *) to->thread.arch.fs); + arch_prctl(to, ARCH_SET_FS, (void __user *) to->thread.arch.fs); } |