This patch makes UML saves/restores FPU state from/to the fpstate in
pt_regs when setting up or returning from a signal stack, rather than
calling ptrace directly. This ensures that FPU state is correctly
preserved around signal handlers in a multi-threaded scenario.
Signed-off-by: Eli Cooper <elicoo...@gmx.com>
---
arch/x86/um/signal.c | 18 +++---------------
1 file changed, 3 insertions(+), 15 deletions(-)
diff --git a/arch/x86/um/signal.c b/arch/x86/um/signal.c
index 14fcd01..dac23ee 100644
--- a/arch/x86/um/signal.c
+++ b/arch/x86/um/signal.c
@@ -225,20 +225,10 @@ static int copy_sc_from_user(struct pt_regs *regs,
} else
#endif
{
- struct user_i387_struct fp;
-
- err = copy_from_user(&fp, (void *)sc.fpstate,
+ err = copy_from_user(regs->regs.fp, (void *)sc.fpstate,
sizeof(struct user_i387_struct));
if (err)
return 1;
-
- err = restore_fp_registers(pid, (unsigned long *) &fp);
- if (err < 0) {
- printk(KERN_ERR "copy_sc_from_user - "
- "restore_fp_registers failed, errno = %d\n",
- -err);
- return 1;
- }
}
return 0;
}
@@ -325,10 +315,8 @@ static int copy_sc_to_user(struct sigcontext __user *to,
} else
#endif
{
- struct user_i387_struct fp;
-
- err = save_fp_registers(pid, (unsigned long *) &fp);
- if (copy_to_user(to_fp, &fp, sizeof(struct user_i387_struct)))
+ if (copy_to_user(to_fp, regs->regs.fp,
+ sizeof(struct user_i387_struct)))
return 1;
}
--
2.7.2
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