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authorSuresh Siddha <suresh.b.siddha@intel.com>2008-07-29 21:29:26 +0400
committerIngo Molnar <mingo@elte.hu>2008-07-30 21:49:28 +0400
commit42deec6f2c3688fdaf986225ac901b817cd91568 (patch)
tree2aba616a46b3fd4568705bdce6384883e6007c8c /arch/x86/kernel/i387.c
parentc37b5efea43f9e500363f9973dd00e3d2cdcc685 (diff)
downloadlinux-42deec6f2c3688fdaf986225ac901b817cd91568.tar.xz
x86, xsave: update xsave header bits during ptrace fpregs set
FP/SSE bits may be zero in the xsave header(representing the init state). Update these bits during the ptrace fpregs set operation, to indicate the non-init state. Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com> Signed-off-by: H. Peter Anvin <hpa@zytor.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/kernel/i387.c')
-rw-r--r--arch/x86/kernel/i387.c13
1 files changed, 13 insertions, 0 deletions
diff --git a/arch/x86/kernel/i387.c b/arch/x86/kernel/i387.c
index cbb9dc474a21..e0ed59f5c19f 100644
--- a/arch/x86/kernel/i387.c
+++ b/arch/x86/kernel/i387.c
@@ -214,6 +214,13 @@ int xfpregs_set(struct task_struct *target, const struct user_regset *regset,
*/
target->thread.xstate->fxsave.mxcsr &= mxcsr_feature_mask;
+ /*
+ * update the header bits in the xsave header, indicating the
+ * presence of FP and SSE state.
+ */
+ if (cpu_has_xsave)
+ target->thread.xstate->xsave.xsave_hdr.xstate_bv |= XSTATE_FPSSE;
+
return ret;
}
@@ -414,6 +421,12 @@ int fpregs_set(struct task_struct *target, const struct user_regset *regset,
if (!ret)
convert_to_fxsr(target, &env);
+ /*
+ * update the header bit in the xsave header, indicating the
+ * presence of FP.
+ */
+ if (cpu_has_xsave)
+ target->thread.xstate->xsave.xsave_hdr.xstate_bv |= XSTATE_FP;
return ret;
}