+/* regset get/set implementations */
+
+static int gpr_get(struct task_struct *target,
+ const struct user_regset *regset,
+ unsigned int pos, unsigned int count,
+ void *kbuf, void __user *ubuf)
+{
+ struct pt_regs *regs = task_pt_regs(target);
+
+ return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
+ regs,
+ 0, sizeof(*regs));
+}
+
+static int gpr_set(struct task_struct *target,
+ const struct user_regset *regset,
+ unsigned int pos, unsigned int count,
+ const void *kbuf, const void __user *ubuf)
+{
+ int ret;
+ struct pt_regs newregs;
+
+ ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
+ &newregs,
+ 0, sizeof(newregs));
+ if (ret)
+ return ret;
+
+ if (!valid_user_regs(&newregs))
+ return -EINVAL;
+
+ *task_pt_regs(target) = newregs;
+ return 0;
+}
+
+static int fpa_get(struct task_struct *target,
+ const struct user_regset *regset,
+ unsigned int pos, unsigned int count,
+ void *kbuf, void __user *ubuf)
+{
+ return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
+ &task_thread_info(target)->fpstate,
+ 0, sizeof(struct user_fp));
+}
+
+static int fpa_set(struct task_struct *target,
+ const struct user_regset *regset,
+ unsigned int pos, unsigned int count,
+ const void *kbuf, const void __user *ubuf)
+{
+ struct thread_info *thread = task_thread_info(target);
+
+ thread->used_cp[1] = thread->used_cp[2] = 1;
+
+ return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
+ &thread->fpstate,
+ 0, sizeof(struct user_fp));
+}
+
+#ifdef CONFIG_VFP
+/*
+ * VFP register get/set implementations.
+ *
+ * With respect to the kernel, struct user_fp is divided into three chunks:
+ * 16 or 32 real VFP registers (d0-d15 or d0-31)
+ * These are transferred to/from the real registers in the task's
+ * vfp_hard_struct. The number of registers depends on the kernel
+ * configuration.
+ *
+ * 16 or 0 fake VFP registers (d16-d31 or empty)
+ * i.e., the user_vfp structure has space for 32 registers even if
+ * the kernel doesn't have them all.
+ *
+ * vfp_get() reads this chunk as zero where applicable
+ * vfp_set() ignores this chunk
+ *
+ * 1 word for the FPSCR
+ *
+ * The bounds-checking logic built into user_regset_copyout and friends
+ * means that we can make a simple sequence of calls to map the relevant data
+ * to/from the specified slice of the user regset structure.
+ */
+static int vfp_get(struct task_struct *target,
+ const struct user_regset *regset,
+ unsigned int pos, unsigned int count,
+ void *kbuf, void __user *ubuf)
+{
+ int ret;
+ struct thread_info *thread = task_thread_info(target);
+ struct vfp_hard_struct const *vfp = &thread->vfpstate.hard;
+ const size_t user_fpregs_offset = offsetof(struct user_vfp, fpregs);
+ const size_t user_fpscr_offset = offsetof(struct user_vfp, fpscr);
+
+ vfp_sync_hwstate(thread);
+
+ ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
+ &vfp->fpregs,
+ user_fpregs_offset,
+ user_fpregs_offset + sizeof(vfp->fpregs));
+ if (ret)
+ return ret;
+
+ ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
+ user_fpregs_offset + sizeof(vfp->fpregs),
+ user_fpscr_offset);
+ if (ret)
+ return ret;
+
+ return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
+ &vfp->fpscr,
+ user_fpscr_offset,
+ user_fpscr_offset + sizeof(vfp->fpscr));
+}
+
+/*
+ * For vfp_set() a read-modify-write is done on the VFP registers,
+ * in order to avoid writing back a half-modified set of registers on
+ * failure.
+ */
+static int vfp_set(struct task_struct *target,
+ const struct user_regset *regset,
+ unsigned int pos, unsigned int count,
+ const void *kbuf, const void __user *ubuf)
+{
+ int ret;
+ struct thread_info *thread = task_thread_info(target);
+ struct vfp_hard_struct new_vfp = thread->vfpstate.hard;
+ const size_t user_fpregs_offset = offsetof(struct user_vfp, fpregs);
+ const size_t user_fpscr_offset = offsetof(struct user_vfp, fpscr);
+
+ ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
+ &new_vfp.fpregs,
+ user_fpregs_offset,
+ user_fpregs_offset + sizeof(new_vfp.fpregs));
+ if (ret)
+ return ret;
+
+ ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
+ user_fpregs_offset + sizeof(new_vfp.fpregs),
+ user_fpscr_offset);
+ if (ret)
+ return ret;
+
+ ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
+ &new_vfp.fpscr,
+ user_fpscr_offset,
+ user_fpscr_offset + sizeof(new_vfp.fpscr));
+ if (ret)
+ return ret;
+
+ vfp_sync_hwstate(thread);
+ thread->vfpstate.hard = new_vfp;
+ vfp_flush_hwstate(thread);
+
+ return 0;
+}
+#endif /* CONFIG_VFP */
+
+enum arm_regset {
+ REGSET_GPR,
+ REGSET_FPR,
+#ifdef CONFIG_VFP
+ REGSET_VFP,
+#endif
+};
+
+static const struct user_regset arm_regsets[] = {
+ [REGSET_GPR] = {
+ .core_note_type = NT_PRSTATUS,
+ .n = ELF_NGREG,
+ .size = sizeof(u32),
+ .align = sizeof(u32),
+ .get = gpr_get,
+ .set = gpr_set
+ },
+ [REGSET_FPR] = {
+ /*
+ * For the FPA regs in fpstate, the real fields are a mixture
+ * of sizes, so pretend that the registers are word-sized:
+ */
+ .core_note_type = NT_PRFPREG,
+ .n = sizeof(struct user_fp) / sizeof(u32),
+ .size = sizeof(u32),
+ .align = sizeof(u32),
+ .get = fpa_get,
+ .set = fpa_set
+ },
+#ifdef CONFIG_VFP
+ [REGSET_VFP] = {
+ /*
+ * Pretend that the VFP regs are word-sized, since the FPSCR is
+ * a single word dangling at the end of struct user_vfp:
+ */
+ .core_note_type = NT_ARM_VFP,
+ .n = ARM_VFPREGS_SIZE / sizeof(u32),
+ .size = sizeof(u32),
+ .align = sizeof(u32),
+ .get = vfp_get,
+ .set = vfp_set
+ },
+#endif /* CONFIG_VFP */
+};
+
+static const struct user_regset_view user_arm_view = {
+ .name = "arm", .e_machine = ELF_ARCH, .ei_osabi = ELF_OSABI,
+ .regsets = arm_regsets, .n = ARRAY_SIZE(arm_regsets)
+};
+
+const struct user_regset_view *task_user_regset_view(struct task_struct *task)
+{
+ return &user_arm_view;
+}
+