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x86: get rid of pt_regs argument of iopl(2)

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Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2012-11-19 22:00:52 -05:00
parent ea93a6e2e7
commit b3af11afe0
7 changed files with 17 additions and 24 deletions
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1
arch/x86/ia32/ia32entry.S
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@ -467,7 +467,6 @@ GLOBAL(\label)
PTREGSCALL stub32_execve, compat_sys_execve, %rcx
PTREGSCALL stub32_fork, sys_fork, %rdi
PTREGSCALL stub32_vfork, sys_vfork, %rdi
PTREGSCALL stub32_iopl, sys_iopl, %rsi
ALIGN
GLOBAL(stub32_clone)

2
arch/x86/include/asm/syscalls.h
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@ -18,7 +18,7 @@
/* 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 *);
asmlinkage long sys_iopl(unsigned int);
/* kernel/ldt.c */
asmlinkage int sys_modify_ldt(int, void __user *, unsigned long);

1
arch/x86/kernel/entry_32.S
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@ -738,7 +738,6 @@ ENTRY(ptregs_##name) ; \
CFI_ENDPROC; \
ENDPROC(ptregs_##name)
PTREGSCALL1(iopl)
PTREGSCALL0(sigreturn)
PTREGSCALL0(rt_sigreturn)
PTREGSCALL2(vm86)

31
arch/x86/kernel/entry_64.S
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@ -828,23 +828,6 @@ int_restore_rest:
CFI_ENDPROC
END(system_call)
/*
* Certain special system calls that need to save a complete full stack frame.
*/
.macro PTREGSCALL label,func,arg
ENTRY(\label)
PARTIAL_FRAME 1 8 /* offset 8: return address */
subq $REST_SKIP, %rsp
CFI_ADJUST_CFA_OFFSET REST_SKIP
call save_rest
DEFAULT_FRAME 0 8 /* offset 8: return address */
leaq 8(%rsp), \arg /* pt_regs pointer */
call \func
jmp ptregscall_common
CFI_ENDPROC
END(\label)
.endm
.macro FORK_LIKE func
ENTRY(stub_\func)
CFI_STARTPROC
@ -861,10 +844,22 @@ ENTRY(stub_\func)
END(stub_\func)
.endm
.macro FIXED_FRAME label,func
ENTRY(\label)
CFI_STARTPROC
PARTIAL_FRAME 0 8 /* offset 8: return address */
FIXUP_TOP_OF_STACK %r11, 8-ARGOFFSET
call \func
RESTORE_TOP_OF_STACK %r11, 8-ARGOFFSET
ret
CFI_ENDPROC
END(\label)
.endm
FORK_LIKE clone
FORK_LIKE fork
FORK_LIKE vfork
PTREGSCALL stub_iopl, sys_iopl, %rsi
FIXED_FRAME stub_iopl, sys_iopl
ENTRY(ptregscall_common)
DEFAULT_FRAME 1 8 /* offset 8: return address */

3
arch/x86/kernel/ioport.c
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@ -93,8 +93,9 @@ asmlinkage long sys_ioperm(unsigned long from, unsigned long num, int turn_on)
* on system-call entry - see also fork() and the signal handling
* code.
*/
long sys_iopl(unsigned int level, struct pt_regs *regs)
SYSCALL_DEFINE1(iopl, unsigned int, level)
{
struct pt_regs *regs = current_pt_regs();
unsigned int old = (regs->flags >> 12) & 3;
struct thread_struct *t = &current->thread;

2
arch/x86/syscalls/syscall_32.tbl
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@ -116,7 +116,7 @@
107 i386 lstat sys_newlstat compat_sys_newlstat
108 i386 fstat sys_newfstat compat_sys_newfstat
109 i386 olduname sys_uname
110 i386 iopl ptregs_iopl stub32_iopl
110 i386 iopl sys_iopl
111 i386 vhangup sys_vhangup
112 i386 idle
113 i386 vm86old ptregs_vm86old sys32_vm86_warning

1
arch/x86/um/sys_call_table_32.c
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@ -24,7 +24,6 @@
#define old_mmap sys_old_mmap
#define ptregs_iopl sys_iopl
#define ptregs_vm86old sys_vm86old
#define ptregs_vm86 sys_vm86