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[elf-fdpic] switch coredump to regsets

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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>
This commit is contained in:
Al Viro 2020-06-15 11:22:55 -04:00
parent d2f581684a
commit 1697a322e2
1 changed files with 18 additions and 5 deletions
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23
fs/binfmt_elf_fdpic.c
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@ -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);