[elf-fdpic] switch coredump to regsets

similar to how elf coredump is working on architectures that
have regsets, and all architectures with elf-fdpic support *do*
have that.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

diff --git a/fs/binfmt_elf_fdpic.c b/fs/binfmt_elf_fdpic.c
index 34c4541..1af03c8 100644 (file)
--- a/fs/binfmt_elf_fdpic.c
+++ b/fs/binfmt_elf_fdpic.c
@@ -35,6 +35,7 @@
 #include <linux/elfcore.h>
 #include <linux/coredump.h>
 #include <linux/dax.h>
+#include <linux/regset.h>
 
 #include <linux/uaccess.h>
 #include <asm/param.h>
@@ -1456,8 +1457,7 @@ struct elf_thread_status
        struct elf_thread_status *next;
        struct elf_prstatus_fdpic prstatus;     /* NT_PRSTATUS */
        elf_fpregset_t fpu;             /* NT_PRFPREG */
-       struct task_struct *thread;
-       struct memelfnote notes[3];
+       struct memelfnote notes[2];
        int num_notes;
 };
 
@@ -1468,22 +1468,35 @@ struct elf_thread_status
  */
 static struct elf_thread_status *elf_dump_thread_status(long signr, struct task_struct *p, int *sz)
 {
+       const struct user_regset_view *view = task_user_regset_view(p);
        struct elf_thread_status *t;
+       int i, ret;
 
        t = kzalloc(sizeof(struct elf_thread_status), GFP_KERNEL);
        if (!t)
                return t;
 
        fill_prstatus(&t->prstatus, p, signr);
-       elf_core_copy_task_regs(p, &t->prstatus.pr_reg);
+       regset_get(p, &view->regsets[0],
+                  sizeof(t->prstatus.pr_reg), &t->prstatus.pr_reg);
 
        fill_note(&t->notes[0], "CORE", NT_PRSTATUS, sizeof(t->prstatus),
                  &t->prstatus);
        t->num_notes++;
        *sz += notesize(&t->notes[0]);
 
-       t->prstatus.pr_fpvalid = elf_core_copy_task_fpregs(p, task_pt_regs(p),
-                                                          &t->fpu);
+       for (i = 1; i < view->n; ++i) {
+               const struct user_regset *regset = &view->regsets[i];
+               if (regset->core_note_type != NT_PRFPREG)
+                       continue;
+               if (regset->active && regset->active(p, regset) <= 0)
+                       continue;
+               ret = regset_get(p, regset, sizeof(t->fpu), &t->fpu);
+               if (ret >= 0)
+                       t->prstatus.pr_fpvalid = 1;
+               break;
+       }
+
        if (t->prstatus.pr_fpvalid) {
                fill_note(&t->notes[1], "CORE", NT_PRFPREG, sizeof(t->fpu),
                          &t->fpu);