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authorEli Cooper <elicooper@gmx.com>2016-03-20 00:58:41 +0800
committerRichard Weinberger <richard@nod.at>2016-05-21 23:38:06 +0200
commita78ff1112263fdd871d3506dbcff44f6f12e8423 (patch)
treee57ced8c83977e3686b8a69343cc5541565b8b94 /arch/um
parentb6024b21fec8367ef961a771cc9dde31f1831965 (diff)
downloadlinux-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/um')
-rw-r--r--arch/um/include/shared/registers.h2
-rw-r--r--arch/um/kernel/process.c2
2 files changed, 3 insertions, 1 deletions
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 <sysdep/ptrace.h>
#include <sysdep/archsetjmp.h>
+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);
}