Merge branch 'x86/asm' into x86/urgent
Merge reason: it's stable so lets push it upstream.
Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/arch/x86/include/asm/syscalls.h b/arch/x86/include/asm/syscalls.h
index 372b76e..b0ce780 100644
--- a/arch/x86/include/asm/syscalls.h
+++ b/arch/x86/include/asm/syscalls.h
@@ -18,16 +18,24 @@
/* Common in X86_32 and X86_64 */
/* kernel/ioport.c */
asmlinkage long sys_ioperm(unsigned long, unsigned long, int);
+long sys_iopl(unsigned int, struct pt_regs *);
/* kernel/process.c */
int sys_fork(struct pt_regs *);
int sys_vfork(struct pt_regs *);
+long sys_execve(char __user *, char __user * __user *,
+ char __user * __user *, struct pt_regs *);
+long sys_clone(unsigned long, unsigned long, void __user *,
+ void __user *, struct pt_regs *);
/* kernel/ldt.c */
asmlinkage int sys_modify_ldt(int, void __user *, unsigned long);
/* kernel/signal.c */
long sys_rt_sigreturn(struct pt_regs *);
+long sys_sigaltstack(const stack_t __user *, stack_t __user *,
+ struct pt_regs *);
+
/* kernel/tls.c */
asmlinkage int sys_set_thread_area(struct user_desc __user *);
@@ -35,18 +43,11 @@
/* X86_32 only */
#ifdef CONFIG_X86_32
-/* kernel/ioport.c */
-long sys_iopl(struct pt_regs *);
-
-/* kernel/process_32.c */
-int sys_clone(struct pt_regs *);
-int sys_execve(struct pt_regs *);
/* kernel/signal.c */
asmlinkage int sys_sigsuspend(int, int, old_sigset_t);
asmlinkage int sys_sigaction(int, const struct old_sigaction __user *,
struct old_sigaction __user *);
-int sys_sigaltstack(struct pt_regs *);
unsigned long sys_sigreturn(struct pt_regs *);
/* kernel/sys_i386_32.c */
@@ -64,28 +65,15 @@
asmlinkage int sys_olduname(struct oldold_utsname __user *);
/* kernel/vm86_32.c */
-int sys_vm86old(struct pt_regs *);
-int sys_vm86(struct pt_regs *);
+int sys_vm86old(struct vm86_struct __user *, struct pt_regs *);
+int sys_vm86(unsigned long, unsigned long, struct pt_regs *);
#else /* CONFIG_X86_32 */
/* X86_64 only */
-/* kernel/ioport.c */
-asmlinkage long sys_iopl(unsigned int, struct pt_regs *);
-
/* kernel/process_64.c */
-asmlinkage long sys_clone(unsigned long, unsigned long,
- void __user *, void __user *,
- struct pt_regs *);
-asmlinkage long sys_execve(char __user *, char __user * __user *,
- char __user * __user *,
- struct pt_regs *);
long sys_arch_prctl(int, unsigned long);
-/* kernel/signal.c */
-asmlinkage long sys_sigaltstack(const stack_t __user *, stack_t __user *,
- struct pt_regs *);
-
/* kernel/sys_x86_64.c */
struct new_utsname;
diff --git a/arch/x86/kernel/entry_32.S b/arch/x86/kernel/entry_32.S
index 50b9c22..44a8e0d 100644
--- a/arch/x86/kernel/entry_32.S
+++ b/arch/x86/kernel/entry_32.S
@@ -725,22 +725,61 @@
/*
* System calls that need a pt_regs pointer.
*/
-#define PTREGSCALL(name) \
+#define PTREGSCALL0(name) \
ALIGN; \
ptregs_##name: \
leal 4(%esp),%eax; \
jmp sys_##name;
-PTREGSCALL(iopl)
-PTREGSCALL(fork)
-PTREGSCALL(clone)
-PTREGSCALL(vfork)
-PTREGSCALL(execve)
-PTREGSCALL(sigaltstack)
-PTREGSCALL(sigreturn)
-PTREGSCALL(rt_sigreturn)
-PTREGSCALL(vm86)
-PTREGSCALL(vm86old)
+#define PTREGSCALL1(name) \
+ ALIGN; \
+ptregs_##name: \
+ leal 4(%esp),%edx; \
+ movl (PT_EBX+4)(%esp),%eax; \
+ jmp sys_##name;
+
+#define PTREGSCALL2(name) \
+ ALIGN; \
+ptregs_##name: \
+ leal 4(%esp),%ecx; \
+ movl (PT_ECX+4)(%esp),%edx; \
+ movl (PT_EBX+4)(%esp),%eax; \
+ jmp sys_##name;
+
+#define PTREGSCALL3(name) \
+ ALIGN; \
+ptregs_##name: \
+ leal 4(%esp),%eax; \
+ pushl %eax; \
+ movl PT_EDX(%eax),%ecx; \
+ movl PT_ECX(%eax),%edx; \
+ movl PT_EBX(%eax),%eax; \
+ call sys_##name; \
+ addl $4,%esp; \
+ ret
+
+PTREGSCALL1(iopl)
+PTREGSCALL0(fork)
+PTREGSCALL0(vfork)
+PTREGSCALL3(execve)
+PTREGSCALL2(sigaltstack)
+PTREGSCALL0(sigreturn)
+PTREGSCALL0(rt_sigreturn)
+PTREGSCALL2(vm86)
+PTREGSCALL1(vm86old)
+
+/* Clone is an oddball. The 4th arg is in %edi */
+ ALIGN;
+ptregs_clone:
+ leal 4(%esp),%eax
+ pushl %eax
+ pushl PT_EDI(%eax)
+ movl PT_EDX(%eax),%ecx
+ movl PT_ECX(%eax),%edx
+ movl PT_EBX(%eax),%eax
+ call sys_clone
+ addl $8,%esp
+ ret
.macro FIXUP_ESPFIX_STACK
/*
@@ -1008,12 +1047,8 @@
ENTRY(kernel_thread_helper)
pushl $0 # fake return address for unwinder
CFI_STARTPROC
- movl %edx,%eax
- push %edx
- CFI_ADJUST_CFA_OFFSET 4
- call *%ebx
- push %eax
- CFI_ADJUST_CFA_OFFSET 4
+ movl %edi,%eax
+ call *%esi
call do_exit
ud2 # padding for call trace
CFI_ENDPROC
diff --git a/arch/x86/kernel/entry_64.S b/arch/x86/kernel/entry_64.S
index 63bca79..73d9b2c 100644
--- a/arch/x86/kernel/entry_64.S
+++ b/arch/x86/kernel/entry_64.S
@@ -1166,63 +1166,20 @@
jmp 2b
.previous
-/*
- * Create a kernel thread.
- *
- * C extern interface:
- * extern long kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)
- *
- * asm input arguments:
- * rdi: fn, rsi: arg, rdx: flags
- */
-ENTRY(kernel_thread)
- CFI_STARTPROC
- FAKE_STACK_FRAME $child_rip
- SAVE_ALL
-
- # rdi: flags, rsi: usp, rdx: will be &pt_regs
- movq %rdx,%rdi
- orq kernel_thread_flags(%rip),%rdi
- movq $-1, %rsi
- movq %rsp, %rdx
-
- xorl %r8d,%r8d
- xorl %r9d,%r9d
-
- # clone now
- call do_fork
- movq %rax,RAX(%rsp)
- xorl %edi,%edi
-
- /*
- * It isn't worth to check for reschedule here,
- * so internally to the x86_64 port you can rely on kernel_thread()
- * not to reschedule the child before returning, this avoids the need
- * of hacks for example to fork off the per-CPU idle tasks.
- * [Hopefully no generic code relies on the reschedule -AK]
- */
- RESTORE_ALL
- UNFAKE_STACK_FRAME
- ret
- CFI_ENDPROC
-END(kernel_thread)
-
-ENTRY(child_rip)
+ENTRY(kernel_thread_helper)
pushq $0 # fake return address
CFI_STARTPROC
/*
* Here we are in the child and the registers are set as they were
* at kernel_thread() invocation in the parent.
*/
- movq %rdi, %rax
- movq %rsi, %rdi
- call *%rax
+ call *%rsi
# exit
mov %eax, %edi
call do_exit
ud2 # padding for call trace
CFI_ENDPROC
-END(child_rip)
+END(kernel_thread_helper)
/*
* execve(). This function needs to use IRET, not SYSRET, to set up all state properly.
diff --git a/arch/x86/kernel/ioport.c b/arch/x86/kernel/ioport.c
index 99c4d30..8eec0ec 100644
--- a/arch/x86/kernel/ioport.c
+++ b/arch/x86/kernel/ioport.c
@@ -103,9 +103,10 @@
* on system-call entry - see also fork() and the signal handling
* code.
*/
-static int do_iopl(unsigned int level, struct pt_regs *regs)
+long sys_iopl(unsigned int level, struct pt_regs *regs)
{
unsigned int old = (regs->flags >> 12) & 3;
+ struct thread_struct *t = ¤t->thread;
if (level > 3)
return -EINVAL;
@@ -115,29 +116,8 @@
return -EPERM;
}
regs->flags = (regs->flags & ~X86_EFLAGS_IOPL) | (level << 12);
+ t->iopl = level << 12;
+ set_iopl_mask(t->iopl);
return 0;
}
-
-#ifdef CONFIG_X86_32
-long sys_iopl(struct pt_regs *regs)
-{
- unsigned int level = regs->bx;
- struct thread_struct *t = ¤t->thread;
- int rc;
-
- rc = do_iopl(level, regs);
- if (rc < 0)
- goto out;
-
- t->iopl = level << 12;
- set_iopl_mask(t->iopl);
-out:
- return rc;
-}
-#else
-asmlinkage long sys_iopl(unsigned int level, struct pt_regs *regs)
-{
- return do_iopl(level, regs);
-}
-#endif
diff --git a/arch/x86/kernel/process.c b/arch/x86/kernel/process.c
index 7a7bd4e..98c2cde 100644
--- a/arch/x86/kernel/process.c
+++ b/arch/x86/kernel/process.c
@@ -255,6 +255,76 @@
NULL, NULL);
}
+long
+sys_clone(unsigned long clone_flags, unsigned long newsp,
+ void __user *parent_tid, void __user *child_tid, struct pt_regs *regs)
+{
+ if (!newsp)
+ newsp = regs->sp;
+ return do_fork(clone_flags, newsp, regs, 0, parent_tid, child_tid);
+}
+
+/*
+ * This gets run with %si containing the
+ * function to call, and %di containing
+ * the "args".
+ */
+extern void kernel_thread_helper(void);
+
+/*
+ * Create a kernel thread
+ */
+int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags)
+{
+ struct pt_regs regs;
+
+ memset(®s, 0, sizeof(regs));
+
+ regs.si = (unsigned long) fn;
+ regs.di = (unsigned long) arg;
+
+#ifdef CONFIG_X86_32
+ regs.ds = __USER_DS;
+ regs.es = __USER_DS;
+ regs.fs = __KERNEL_PERCPU;
+ regs.gs = __KERNEL_STACK_CANARY;
+#endif
+
+ regs.orig_ax = -1;
+ regs.ip = (unsigned long) kernel_thread_helper;
+ regs.cs = __KERNEL_CS | get_kernel_rpl();
+ regs.flags = X86_EFLAGS_IF | 0x2;
+
+ /* Ok, create the new process.. */
+ return do_fork(flags | CLONE_VM | CLONE_UNTRACED, 0, ®s, 0, NULL, NULL);
+}
+EXPORT_SYMBOL(kernel_thread);
+
+/*
+ * sys_execve() executes a new program.
+ */
+long sys_execve(char __user *name, char __user * __user *argv,
+ char __user * __user *envp, struct pt_regs *regs)
+{
+ long error;
+ char *filename;
+
+ filename = getname(name);
+ error = PTR_ERR(filename);
+ if (IS_ERR(filename))
+ return error;
+ error = do_execve(filename, argv, envp, regs);
+
+#ifdef CONFIG_X86_32
+ if (error == 0) {
+ /* Make sure we don't return using sysenter.. */
+ set_thread_flag(TIF_IRET);
+ }
+#endif
+
+ putname(filename);
+ return error;
+}
/*
* Idle related variables and functions
diff --git a/arch/x86/kernel/process_32.c b/arch/x86/kernel/process_32.c
index 120b887..9c517b5 100644
--- a/arch/x86/kernel/process_32.c
+++ b/arch/x86/kernel/process_32.c
@@ -180,39 +180,6 @@
show_trace(NULL, regs, ®s->sp, regs->bp);
}
-/*
- * This gets run with %bx containing the
- * function to call, and %dx containing
- * the "args".
- */
-extern void kernel_thread_helper(void);
-
-/*
- * Create a kernel thread
- */
-int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags)
-{
- struct pt_regs regs;
-
- memset(®s, 0, sizeof(regs));
-
- regs.bx = (unsigned long) fn;
- regs.dx = (unsigned long) arg;
-
- regs.ds = __USER_DS;
- regs.es = __USER_DS;
- regs.fs = __KERNEL_PERCPU;
- regs.gs = __KERNEL_STACK_CANARY;
- regs.orig_ax = -1;
- regs.ip = (unsigned long) kernel_thread_helper;
- regs.cs = __KERNEL_CS | get_kernel_rpl();
- regs.flags = X86_EFLAGS_IF | X86_EFLAGS_SF | X86_EFLAGS_PF | 0x2;
-
- /* Ok, create the new process.. */
- return do_fork(flags | CLONE_VM | CLONE_UNTRACED, 0, ®s, 0, NULL, NULL);
-}
-EXPORT_SYMBOL(kernel_thread);
-
void release_thread(struct task_struct *dead_task)
{
BUG_ON(dead_task->mm);
@@ -424,46 +391,6 @@
return prev_p;
}
-int sys_clone(struct pt_regs *regs)
-{
- unsigned long clone_flags;
- unsigned long newsp;
- int __user *parent_tidptr, *child_tidptr;
-
- clone_flags = regs->bx;
- newsp = regs->cx;
- parent_tidptr = (int __user *)regs->dx;
- child_tidptr = (int __user *)regs->di;
- if (!newsp)
- newsp = regs->sp;
- return do_fork(clone_flags, newsp, regs, 0, parent_tidptr, child_tidptr);
-}
-
-/*
- * sys_execve() executes a new program.
- */
-int sys_execve(struct pt_regs *regs)
-{
- int error;
- char *filename;
-
- filename = getname((char __user *) regs->bx);
- error = PTR_ERR(filename);
- if (IS_ERR(filename))
- goto out;
- error = do_execve(filename,
- (char __user * __user *) regs->cx,
- (char __user * __user *) regs->dx,
- regs);
- if (error == 0) {
- /* Make sure we don't return using sysenter.. */
- set_thread_flag(TIF_IRET);
- }
- putname(filename);
-out:
- return error;
-}
-
#define top_esp (THREAD_SIZE - sizeof(unsigned long))
#define top_ebp (THREAD_SIZE - 2*sizeof(unsigned long))
diff --git a/arch/x86/kernel/process_64.c b/arch/x86/kernel/process_64.c
index e5ab0cd..52fbd0c 100644
--- a/arch/x86/kernel/process_64.c
+++ b/arch/x86/kernel/process_64.c
@@ -57,8 +57,6 @@
DEFINE_PER_CPU(unsigned long, old_rsp);
static DEFINE_PER_CPU(unsigned char, is_idle);
-unsigned long kernel_thread_flags = CLONE_VM | CLONE_UNTRACED;
-
static ATOMIC_NOTIFIER_HEAD(idle_notifier);
void idle_notifier_register(struct notifier_block *n)
@@ -273,8 +271,9 @@
*childregs = *regs;
childregs->ax = 0;
- childregs->sp = sp;
- if (sp == ~0UL)
+ if (user_mode(regs))
+ childregs->sp = sp;
+ else
childregs->sp = (unsigned long)childregs;
p->thread.sp = (unsigned long) childregs;
@@ -508,25 +507,6 @@
return prev_p;
}
-/*
- * sys_execve() executes a new program.
- */
-asmlinkage
-long sys_execve(char __user *name, char __user * __user *argv,
- char __user * __user *envp, struct pt_regs *regs)
-{
- long error;
- char *filename;
-
- filename = getname(name);
- error = PTR_ERR(filename);
- if (IS_ERR(filename))
- return error;
- error = do_execve(filename, argv, envp, regs);
- putname(filename);
- return error;
-}
-
void set_personality_64bit(void)
{
/* inherit personality from parent */
@@ -541,15 +521,6 @@
current->personality &= ~READ_IMPLIES_EXEC;
}
-asmlinkage long
-sys_clone(unsigned long clone_flags, unsigned long newsp,
- void __user *parent_tid, void __user *child_tid, struct pt_regs *regs)
-{
- if (!newsp)
- newsp = regs->sp;
- return do_fork(clone_flags, newsp, regs, 0, parent_tid, child_tid);
-}
-
unsigned long get_wchan(struct task_struct *p)
{
unsigned long stack;
diff --git a/arch/x86/kernel/signal.c b/arch/x86/kernel/signal.c
index 74fe6d8..4fd173c 100644
--- a/arch/x86/kernel/signal.c
+++ b/arch/x86/kernel/signal.c
@@ -545,22 +545,12 @@
}
#endif /* CONFIG_X86_32 */
-#ifdef CONFIG_X86_32
-int sys_sigaltstack(struct pt_regs *regs)
-{
- const stack_t __user *uss = (const stack_t __user *)regs->bx;
- stack_t __user *uoss = (stack_t __user *)regs->cx;
-
- return do_sigaltstack(uss, uoss, regs->sp);
-}
-#else /* !CONFIG_X86_32 */
-asmlinkage long
+long
sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss,
struct pt_regs *regs)
{
return do_sigaltstack(uss, uoss, regs->sp);
}
-#endif /* CONFIG_X86_32 */
/*
* Do a signal return; undo the signal stack.
diff --git a/arch/x86/kernel/vm86_32.c b/arch/x86/kernel/vm86_32.c
index 9c4e625..5ffb5622 100644
--- a/arch/x86/kernel/vm86_32.c
+++ b/arch/x86/kernel/vm86_32.c
@@ -197,9 +197,8 @@
static int do_vm86_irq_handling(int subfunction, int irqnumber);
static void do_sys_vm86(struct kernel_vm86_struct *info, struct task_struct *tsk);
-int sys_vm86old(struct pt_regs *regs)
+int sys_vm86old(struct vm86_struct __user *v86, struct pt_regs *regs)
{
- struct vm86_struct __user *v86 = (struct vm86_struct __user *)regs->bx;
struct kernel_vm86_struct info; /* declare this _on top_,
* this avoids wasting of stack space.
* This remains on the stack until we
@@ -227,7 +226,7 @@
}
-int sys_vm86(struct pt_regs *regs)
+int sys_vm86(unsigned long cmd, unsigned long arg, struct pt_regs *regs)
{
struct kernel_vm86_struct info; /* declare this _on top_,
* this avoids wasting of stack space.
@@ -239,12 +238,12 @@
struct vm86plus_struct __user *v86;
tsk = current;
- switch (regs->bx) {
+ switch (cmd) {
case VM86_REQUEST_IRQ:
case VM86_FREE_IRQ:
case VM86_GET_IRQ_BITS:
case VM86_GET_AND_RESET_IRQ:
- ret = do_vm86_irq_handling(regs->bx, (int)regs->cx);
+ ret = do_vm86_irq_handling(cmd, (int)arg);
goto out;
case VM86_PLUS_INSTALL_CHECK:
/*
@@ -261,7 +260,7 @@
ret = -EPERM;
if (tsk->thread.saved_sp0)
goto out;
- v86 = (struct vm86plus_struct __user *)regs->cx;
+ v86 = (struct vm86plus_struct __user *)arg;
tmp = copy_vm86_regs_from_user(&info.regs, &v86->regs,
offsetof(struct kernel_vm86_struct, regs32) -
sizeof(info.regs));
diff --git a/arch/x86/kernel/x8664_ksyms_64.c b/arch/x86/kernel/x8664_ksyms_64.c
index a102976..9fafaf8 100644
--- a/arch/x86/kernel/x8664_ksyms_64.c
+++ b/arch/x86/kernel/x8664_ksyms_64.c
@@ -17,8 +17,6 @@
EXPORT_SYMBOL(mcount);
#endif
-EXPORT_SYMBOL(kernel_thread);
-
EXPORT_SYMBOL(__get_user_1);
EXPORT_SYMBOL(__get_user_2);
EXPORT_SYMBOL(__get_user_4);