um: add extended processor state save/restore support
This patch extends save_fp_registers() and restore_fp_registers() to use
PTRACE_GETREGSET and PTRACE_SETREGSET with the XSTATE note type, adding
support for new processor state extensions between context switches.
When the new ptrace requests are unavailable, it falls back to the old
PTRACE_GETFPREGS and PTRACE_SETFPREGS methods, which have been renamed to
save_i387_registers() and restore_i387_registers().
Now these functions expect *fp_regs to have the space of an _xstate struct.
Thus, this also makes ptrace in UML responde to PTRACE_GETFPREGS/_SETFPREG
requests with a user_i387_struct (thus independent from HOST_FP_SIZE), and
by calling save_i387_registers() and restore_i387_registers() instead of
the extended save_fp_registers() and restore_fp_registers() functions.
Signed-off-by: Eli Cooper <elicooper@gmx.com>
diff --git a/arch/x86/um/ptrace_32.c b/arch/x86/um/ptrace_32.c
index 47c78d5..ebd4dd6 100644
--- a/arch/x86/um/ptrace_32.c
+++ b/arch/x86/um/ptrace_32.c
@@ -194,7 +194,8 @@
int err, n, cpu = ((struct thread_info *) child->stack)->cpu;
struct user_i387_struct fpregs;
- err = save_fp_registers(userspace_pid[cpu], (unsigned long *) &fpregs);
+ err = save_i387_registers(userspace_pid[cpu],
+ (unsigned long *) &fpregs);
if (err)
return err;
@@ -214,7 +215,7 @@
if (n > 0)
return -EFAULT;
- return restore_fp_registers(userspace_pid[cpu],
+ return restore_i387_registers(userspace_pid[cpu],
(unsigned long *) &fpregs);
}