From a78ff1112263fdd871d3506dbcff44f6f12e8423 Mon Sep 17 00:00:00 2001 From: Eli Cooper Date: Sun, 20 Mar 2016 00:58:41 +0800 Subject: 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 --- arch/um/include/shared/registers.h | 2 ++ arch/um/kernel/process.c | 2 +- 2 files changed, 3 insertions(+), 1 deletion(-) (limited to 'arch/um') diff --git a/arch/um/include/shared/registers.h b/arch/um/include/shared/registers.h index f5b76355ad71..a74449b5b0e3 100644 --- a/arch/um/include/shared/registers.h +++ b/arch/um/include/shared/registers.h @@ -9,6 +9,8 @@ #include #include +extern int save_i387_registers(int pid, unsigned long *fp_regs); +extern int restore_i387_registers(int pid, unsigned long *fp_regs); extern int save_fp_registers(int pid, unsigned long *fp_regs); extern int restore_fp_registers(int pid, unsigned long *fp_regs); extern int save_fpx_registers(int pid, unsigned long *fp_regs); diff --git a/arch/um/kernel/process.c b/arch/um/kernel/process.c index 48af59aae129..d55a473dca4a 100644 --- a/arch/um/kernel/process.c +++ b/arch/um/kernel/process.c @@ -402,6 +402,6 @@ int elf_core_copy_fpregs(struct task_struct *t, elf_fpregset_t *fpu) { int cpu = current_thread_info()->cpu; - return save_fp_registers(userspace_pid[cpu], (unsigned long *) fpu); + return save_i387_registers(userspace_pid[cpu], (unsigned long *) fpu); } -- cgit v1.2.3