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authorTejun Heo <tj@kernel.org>2009-02-09 14:17:39 +0100
committerIngo Molnar <mingo@elte.hu>2009-02-10 00:39:14 +0100
commitd315760ffa261c15ff92699ac6f514112543d7ca (patch)
tree3f7d185cf97a06e6686521a23a1c78d1809a51c4 /arch/x86/math-emu/fpu_entry.c
parentx86: math_emu info cleanup (diff)
downloadlinux-d315760ffa261c15ff92699ac6f514112543d7ca.tar.xz
linux-d315760ffa261c15ff92699ac6f514112543d7ca.zip
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>
Diffstat (limited to 'arch/x86/math-emu/fpu_entry.c')
-rw-r--r--arch/x86/math-emu/fpu_entry.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/x86/math-emu/fpu_entry.c b/arch/x86/math-emu/fpu_entry.c
index c268abe72253..5d87f586f8d7 100644
--- 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;