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um: add extended processor state save/restore support

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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>
This commit is contained in:
Eli Cooper
2016-03-20 00:58:41 +08:00
committed by Richard Weinberger
parent b6024b21fe
commit a78ff11122
6 changed files with 62 additions and 16 deletions
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16
arch/x86/um/ptrace_64.c
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@@ -222,14 +222,14 @@ int is_syscall(unsigned long addr)
static int get_fpregs(struct user_i387_struct __user *buf, struct task_struct *child)
{
int err, n, cpu = ((struct thread_info *) child->stack)->cpu;
long fpregs[HOST_FP_SIZE];
struct user_i387_struct fpregs;
BUG_ON(sizeof(*buf) != sizeof(fpregs));
err = save_fp_registers(userspace_pid[cpu], fpregs);
err = save_i387_registers(userspace_pid[cpu],
(unsigned long *) &fpregs);
if (err)
return err;
n = copy_to_user(buf, fpregs, sizeof(fpregs));
n = copy_to_user(buf, &fpregs, sizeof(fpregs));
if (n > 0)
return -EFAULT;
@@ -239,14 +239,14 @@ static int get_fpregs(struct user_i387_struct __user *buf, struct task_struct *c
static int set_fpregs(struct user_i387_struct __user *buf, struct task_struct *child)
{
int n, cpu = ((struct thread_info *) child->stack)->cpu;
long fpregs[HOST_FP_SIZE];
struct user_i387_struct fpregs;
BUG_ON(sizeof(*buf) != sizeof(fpregs));
n = copy_from_user(fpregs, buf, sizeof(fpregs));
n = copy_from_user(&fpregs, buf, sizeof(fpregs));
if (n > 0)
return -EFAULT;
return restore_fp_registers(userspace_pid[cpu], fpregs);
return restore_i387_registers(userspace_pid[cpu],
(unsigned long *) &fpregs);
}
long subarch_ptrace(struct task_struct *child, long request,