x86: fix math_emu register frame access

do_device_not_available() is the handler for #NM and it declares that
it takes a unsigned long and calls math_emu(), which takes a long
argument and surprisingly expects the stack frame starting at the zero
argument would match struct math_emu_info, which isn't true regardless
of configuration in the current code.

This patch makes do_device_not_available() take struct pt_regs like
other exception handlers and initialize struct math_emu_info with
pointer to it and pass pointer to the math_emu_info to math_emulate()
like normal C functions do.  This way, unless gcc makes a copy of
struct pt_regs in do_device_not_available(), the register frame is
correctly accessed regardless of kernel configuration or compiler
used.

This doesn't fix all math_emu problems but it at least gets it
somewhat working.

Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/arch/x86/include/asm/math_emu.h b/arch/x86/include/asm/math_emu.h
index 302492c77956ac86828208881947ffb8a54fd3c5..031f6266f42564441f86535157923b146feff0c2 100644 (file)
--- a/arch/x86/include/asm/math_emu.h
+++ b/arch/x86/include/asm/math_emu.h
@@ -11,8 +11,8 @@
 struct math_emu_info {
        long ___orig_eip;
        union {
-               struct pt_regs regs;
-               struct kernel_vm86_regs vm86;
+               struct pt_regs *regs;
+               struct kernel_vm86_regs *vm86;
        };
 };
 #endif /* _ASM_X86_MATH_EMU_H */

diff --git a/arch/x86/include/asm/traps.h b/arch/x86/include/asm/traps.h
index 2ee0a3bceedf4738cc0e65b1cda67110399550f1..cf3bb053da0b83cb51909168893c35726bc8290a 100644 (file)
--- a/arch/x86/include/asm/traps.h
+++ b/arch/x86/include/asm/traps.h
@@ -41,7 +41,7 @@ dotraplinkage void do_int3(struct pt_regs *, long);
 dotraplinkage void do_overflow(struct pt_regs *, long);
 dotraplinkage void do_bounds(struct pt_regs *, long);
 dotraplinkage void do_invalid_op(struct pt_regs *, long);
-dotraplinkage void do_device_not_available(struct pt_regs *, long);
+dotraplinkage void do_device_not_available(struct pt_regs);
 dotraplinkage void do_coprocessor_segment_overrun(struct pt_regs *, long);
 dotraplinkage void do_invalid_TSS(struct pt_regs *, long);
 dotraplinkage void do_segment_not_present(struct pt_regs *, long);
@@ -77,7 +77,7 @@ extern int panic_on_unrecovered_nmi;
 extern int kstack_depth_to_print;
 
 void math_error(void __user *);
-asmlinkage void math_emulate(long);
+void math_emulate(struct math_emu_info *);
 #ifdef CONFIG_X86_32
 unsigned long patch_espfix_desc(unsigned long, unsigned long);
 #else

diff --git a/arch/x86/kernel/traps.c b/arch/x86/kernel/traps.c
index 98c2d055284b32fb2ce6ff6776b9cb049c103ae0..7932338d7cb3112c7222121e513db0ca71190fa0 100644 (file)
--- a/arch/x86/kernel/traps.c
+++ b/arch/x86/kernel/traps.c
@@ -896,7 +896,7 @@ asmlinkage void math_state_restore(void)
 EXPORT_SYMBOL_GPL(math_state_restore);
 
 #ifndef CONFIG_MATH_EMULATION
-asmlinkage void math_emulate(long arg)
+void math_emulate(struct math_emu_info *info)
 {
        printk(KERN_EMERG
                "math-emulation not enabled and no coprocessor found.\n");
@@ -906,16 +906,19 @@ asmlinkage void math_emulate(long arg)
 }
 #endif /* CONFIG_MATH_EMULATION */
 
-dotraplinkage void __kprobes
-do_device_not_available(struct pt_regs *regs, long error)
+dotraplinkage void __kprobes do_device_not_available(struct pt_regs regs)
 {
 #ifdef CONFIG_X86_32
        if (read_cr0() & X86_CR0_EM) {
-               conditional_sti(regs);
-               math_emulate(0);
+               struct math_emu_info info = { };
+
+               conditional_sti(&regs);
+
+               info.regs = &regs;
+               math_emulate(&info);
        } else {
                math_state_restore(); /* interrupts still off */
-               conditional_sti(regs);
+               conditional_sti(&regs);
        }
 #else
        math_state_restore();

diff --git a/arch/x86/math-emu/fpu_entry.c b/arch/x86/math-emu/fpu_entry.c
index c268abe722530c13735d9452b0678ea030401bf4..5d87f586f8d7242cc48c41265a90ab67069a7800 100644 (file)
--- a/arch/x86/math-emu/fpu_entry.c
+++ b/arch/x86/math-emu/fpu_entry.c
@@ -131,7 +131,7 @@ u_char emulating = 0;
 static int valid_prefix(u_char *Byte, u_char __user ** fpu_eip,
                        overrides * override);
 
-asmlinkage void math_emulate(long arg)
+void math_emulate(struct math_emu_info *info)
 {
        u_char FPU_modrm, byte1;
        unsigned short code;
@@ -161,7 +161,7 @@ asmlinkage void math_emulate(long arg)
        RE_ENTRANT_CHECK_ON;
 #endif /* RE_ENTRANT_CHECKING */
 
-       SETUP_DATA_AREA(arg);
+       FPU_info = info;
 
        FPU_ORIG_EIP = FPU_EIP;
 

diff --git a/arch/x86/math-emu/fpu_proto.h b/arch/x86/math-emu/fpu_proto.h
index 51bfbb61c5b14baba520629d08fb43b5444d54d1..9779df436b7d8c70ed8e5249f508c97f098a6c1b 100644 (file)
--- a/arch/x86/math-emu/fpu_proto.h
+++ b/arch/x86/math-emu/fpu_proto.h
@@ -51,7 +51,7 @@ extern void ffreep(void);
 extern void fst_i_(void);
 extern void fstp_i(void);
 /* fpu_entry.c */
-asmlinkage extern void math_emulate(long arg);
+extern void math_emulate(struct math_emu_info *info);
 extern void math_abort(struct math_emu_info *info, unsigned int signal);
 /* fpu_etc.c */
 extern void FPU_etc(void);

diff --git a/arch/x86/math-emu/fpu_system.h b/arch/x86/math-emu/fpu_system.h
index 6729c6a31348bd05747ca4f8bda62fb8b3f52a6d..50fa0ec2c8a5f87a463a14164cf365291627a532 100644 (file)
--- a/arch/x86/math-emu/fpu_system.h
+++ b/arch/x86/math-emu/fpu_system.h
@@ -16,10 +16,6 @@
 #include <linux/kernel.h>
 #include <linux/mm.h>
 
-/* This sets the pointer FPU_info to point to the argument part
-   of the stack frame of math_emulate() */
-#define SETUP_DATA_AREA(arg)   FPU_info = (struct math_emu_info *) &arg
-
 /* s is always from a cpu register, and the cpu does bounds checking
  * during register load --> no further bounds checks needed */
 #define LDT_DESCRIPTOR(s)      (((struct desc_struct *)current->mm->context.ldt)[(s) >> 3])
@@ -38,12 +34,12 @@
 #define I387                   (current->thread.xstate)
 #define FPU_info               (I387->soft.info)
 
-#define FPU_CS                 (*(unsigned short *) &(FPU_info->regs.cs))
-#define FPU_SS                 (*(unsigned short *) &(FPU_info->regs.ss))
-#define FPU_DS                 (*(unsigned short *) &(FPU_info->regs.ds))
-#define FPU_EAX                        (FPU_info->regs.ax)
-#define FPU_EFLAGS             (FPU_info->regs.flags)
-#define FPU_EIP                        (FPU_info->regs.ip)
+#define FPU_CS                 (*(unsigned short *) &(FPU_info->regs->cs))
+#define FPU_SS                 (*(unsigned short *) &(FPU_info->regs->ss))
+#define FPU_DS                 (*(unsigned short *) &(FPU_info->regs->ds))
+#define FPU_EAX                        (FPU_info->regs->ax)
+#define FPU_EFLAGS             (FPU_info->regs->flags)
+#define FPU_EIP                        (FPU_info->regs->ip)
 #define FPU_ORIG_EIP           (FPU_info->___orig_eip)
 
 #define FPU_lookahead           (I387->soft.lookahead)

diff --git a/arch/x86/math-emu/get_address.c b/arch/x86/math-emu/get_address.c
index 62daa7fcc44c7a4212382cabac32ce62ea7b52dd..420b3b6e39152d86d1c81e4e6ab69f65dbc69cbf 100644 (file)
--- a/arch/x86/math-emu/get_address.c
+++ b/arch/x86/math-emu/get_address.c
@@ -29,43 +29,43 @@
 #define FPU_WRITE_BIT 0x10
 
 static int reg_offset[] = {
-       offsetof(struct math_emu_info, regs.ax),
-       offsetof(struct math_emu_info, regs.cx),
-       offsetof(struct math_emu_info, regs.dx),
-       offsetof(struct math_emu_info, regs.bx),
-       offsetof(struct math_emu_info, regs.sp),
-       offsetof(struct math_emu_info, regs.bp),
-       offsetof(struct math_emu_info, regs.si),
-       offsetof(struct math_emu_info, regs.di)
+       offsetof(struct pt_regs, ax),
+       offsetof(struct pt_regs, cx),
+       offsetof(struct pt_regs, dx),
+       offsetof(struct pt_regs, bx),
+       offsetof(struct pt_regs, sp),
+       offsetof(struct pt_regs, bp),
+       offsetof(struct pt_regs, si),
+       offsetof(struct pt_regs, di)
 };
 
-#define REG_(x) (*(long *)(reg_offset[(x)]+(u_char *) FPU_info))
+#define REG_(x) (*(long *)(reg_offset[(x)] + (u_char *)FPU_info->regs))
 
 static int reg_offset_vm86[] = {
-       offsetof(struct math_emu_info, regs.cs),
-       offsetof(struct math_emu_info, vm86.ds),
-       offsetof(struct math_emu_info, vm86.es),
-       offsetof(struct math_emu_info, vm86.fs),
-       offsetof(struct math_emu_info, vm86.gs),
-       offsetof(struct math_emu_info, regs.ss),
-       offsetof(struct math_emu_info, vm86.ds)
+       offsetof(struct pt_regs, cs),
+       offsetof(struct kernel_vm86_regs, ds),
+       offsetof(struct kernel_vm86_regs, es),
+       offsetof(struct kernel_vm86_regs, fs),
+       offsetof(struct kernel_vm86_regs, gs),
+       offsetof(struct pt_regs, ss),
+       offsetof(struct kernel_vm86_regs, ds)
 };
 
 #define VM86_REG_(x) (*(unsigned short *) \
-                     (reg_offset_vm86[((unsigned)x)]+(u_char *) FPU_info))
+               (reg_offset_vm86[((unsigned)x)] + (u_char *)FPU_info->regs))
 
 static int reg_offset_pm[] = {
-       offsetof(struct math_emu_info, regs.cs),
-       offsetof(struct math_emu_info, regs.ds),
-       offsetof(struct math_emu_info, regs.es),
-       offsetof(struct math_emu_info, regs.fs),
-       offsetof(struct math_emu_info, regs.ds), /* dummy, not saved on stack */
-       offsetof(struct math_emu_info, regs.ss),
-       offsetof(struct math_emu_info, regs.ds)
+       offsetof(struct pt_regs, cs),
+       offsetof(struct pt_regs, ds),
+       offsetof(struct pt_regs, es),
+       offsetof(struct pt_regs, fs),
+       offsetof(struct pt_regs, ds),   /* dummy, not saved on stack */
+       offsetof(struct pt_regs, ss),
+       offsetof(struct pt_regs, ds)
 };
 
 #define PM_REG_(x) (*(unsigned short *) \
-                     (reg_offset_pm[((unsigned)x)]+(u_char *) FPU_info))
+               (reg_offset_pm[((unsigned)x)] + (u_char *)FPU_info->regs))
 
 /* Decode the SIB byte. This function assumes mod != 0 */
 static int sib(int mod, unsigned long *fpu_eip)
@@ -346,34 +346,34 @@ void __user *FPU_get_address_16(u_char FPU_modrm, unsigned long *fpu_eip,
        }
        switch (rm) {
        case 0:
-               address += FPU_info->regs.bx + FPU_info->regs.si;
+               address += FPU_info->regs->bx + FPU_info->regs->si;
                break;
        case 1:
-               address += FPU_info->regs.bx + FPU_info->regs.di;
+               address += FPU_info->regs->bx + FPU_info->regs->di;
                break;
        case 2:
-               address += FPU_info->regs.bp + FPU_info->regs.si;
+               address += FPU_info->regs->bp + FPU_info->regs->si;
                if (addr_modes.override.segment == PREFIX_DEFAULT)
                        addr_modes.override.segment = PREFIX_SS_;
                break;
        case 3:
-               address += FPU_info->regs.bp + FPU_info->regs.di;
+               address += FPU_info->regs->bp + FPU_info->regs->di;
                if (addr_modes.override.segment == PREFIX_DEFAULT)
                        addr_modes.override.segment = PREFIX_SS_;
                break;
        case 4:
-               address += FPU_info->regs.si;
+               address += FPU_info->regs->si;
                break;
        case 5:
-               address += FPU_info->regs.di;
+               address += FPU_info->regs->di;
                break;
        case 6:
-               address += FPU_info->regs.bp;
+               address += FPU_info->regs->bp;
                if (addr_modes.override.segment == PREFIX_DEFAULT)
                        addr_modes.override.segment = PREFIX_SS_;
                break;
        case 7:
-               address += FPU_info->regs.bx;
+               address += FPU_info->regs->bx;
                break;
        }