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authorAl Viro <viro@zeniv.linux.org.uk>2012-11-19 22:00:52 -0500
committerAl Viro <viro@zeniv.linux.org.uk>2013-02-03 18:16:24 -0500
commitb3af11afe06abdcf980b5f5c0b44dc46c496ddc3 (patch)
tree3f784880fd8f14734dd3fd19a5a5a3757df0d44c
parentea93a6e2e73c5a1a8d1d60098f1ca5618fd5aca1 (diff)
downloadlinux-b3af11afe06abdcf980b5f5c0b44dc46c496ddc3.tar.bz2
x86: get rid of pt_regs argument of iopl(2)
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
-rw-r--r--arch/x86/ia32/ia32entry.S1
-rw-r--r--arch/x86/include/asm/syscalls.h2
-rw-r--r--arch/x86/kernel/entry_32.S1
-rw-r--r--arch/x86/kernel/entry_64.S31
-rw-r--r--arch/x86/kernel/ioport.c3
-rw-r--r--arch/x86/syscalls/syscall_32.tbl2
-rw-r--r--arch/x86/um/sys_call_table_32.c1
7 files changed, 17 insertions, 24 deletions
diff --git a/arch/x86/ia32/ia32entry.S b/arch/x86/ia32/ia32entry.S
index 102ff7cb3e41..74bc91e3612b 100644
--- a/arch/x86/ia32/ia32entry.S
+++ b/arch/x86/ia32/ia32entry.S
@@ -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)
diff --git a/arch/x86/include/asm/syscalls.h b/arch/x86/include/asm/syscalls.h
index 58b7e3eac0ae..76be6f2d980c 100644
--- a/arch/x86/include/asm/syscalls.h
+++ b/arch/x86/include/asm/syscalls.h
@@ -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);
diff --git a/arch/x86/kernel/entry_32.S b/arch/x86/kernel/entry_32.S
index 6ed91d9980e2..415c6346d8bf 100644
--- a/arch/x86/kernel/entry_32.S
+++ b/arch/x86/kernel/entry_32.S
@@ -738,7 +738,6 @@ ENTRY(ptregs_##name) ; \
CFI_ENDPROC; \
ENDPROC(ptregs_##name)
-PTREGSCALL1(iopl)
PTREGSCALL0(sigreturn)
PTREGSCALL0(rt_sigreturn)
PTREGSCALL2(vm86)
diff --git a/arch/x86/kernel/entry_64.S b/arch/x86/kernel/entry_64.S
index 2f2f57ac3748..4486fee3999f 100644
--- a/arch/x86/kernel/entry_64.S
+++ b/arch/x86/kernel/entry_64.S
@@ -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 */
diff --git a/arch/x86/kernel/ioport.c b/arch/x86/kernel/ioport.c
index 8c968974253d..4ddaf66ea35f 100644
--- a/arch/x86/kernel/ioport.c
+++ b/arch/x86/kernel/ioport.c
@@ -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;
diff --git a/arch/x86/syscalls/syscall_32.tbl b/arch/x86/syscalls/syscall_32.tbl
index 28e3fa9056ea..aa15a7a94cf7 100644
--- a/arch/x86/syscalls/syscall_32.tbl
+++ b/arch/x86/syscalls/syscall_32.tbl
@@ -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
diff --git a/arch/x86/um/sys_call_table_32.c b/arch/x86/um/sys_call_table_32.c
index a0c3b0d1a122..5cc2bcefb6ab 100644
--- a/arch/x86/um/sys_call_table_32.c
+++ b/arch/x86/um/sys_call_table_32.c
@@ -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