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| author | Eli Cooper <elicooper@gmx.com> | 2016-03-20 00:58:41 +0800 |
|---|---|---|
| committer | Richard Weinberger <richard@nod.at> | 2016-05-21 23:38:06 +0200 |
| commit | a78ff1112263fdd871d3506dbcff44f6f12e8423 (patch) | |
| tree | e57ced8c83977e3686b8a69343cc5541565b8b94 /arch/x86/um/ptrace_64.c | |
| parent | b6024b21fec8367ef961a771cc9dde31f1831965 (diff) | |
| download | linux-a78ff1112263fdd871d3506dbcff44f6f12e8423.tar.bz2 | |
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>
Diffstat (limited to 'arch/x86/um/ptrace_64.c')
| -rw-r--r-- | arch/x86/um/ptrace_64.c | 16 |
1 files changed, 8 insertions, 8 deletions
diff --git a/arch/x86/um/ptrace_64.c b/arch/x86/um/ptrace_64.c index a629694ee750..faab418876ce 100644 --- a/arch/x86/um/ptrace_64.c +++ b/arch/x86/um/ptrace_64.c @@ -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, |