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authorRalf Baechle <ralf@linux-mips.org>2012-08-02 14:44:11 +0200
committerRalf Baechle <ralf@linux-mips.org>2013-10-29 21:25:05 +0100
commit7aeb753b53538bc3b4377022db7aa3ae42653ce3 (patch)
tree464dbe488772b2a4d19a52e069cedb78eee740fb /arch/mips/kernel
parentbc3d22c13e8b1ae0be016c67406787231f9e6548 (diff)
MIPS: Implement task_user_regset_view.
There are no users yet of task_user_regset_view. yet; users will be implemented rsp activated in subsequent commits. Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips/kernel')
-rw-r--r--arch/mips/kernel/ptrace.c129
1 files changed, 129 insertions, 0 deletions
diff --git a/arch/mips/kernel/ptrace.c b/arch/mips/kernel/ptrace.c
index 7a5d7ac6b0d4..83a6a464db70 100644
--- a/arch/mips/kernel/ptrace.c
+++ b/arch/mips/kernel/ptrace.c
@@ -16,11 +16,13 @@
*/
#include <linux/compiler.h>
#include <linux/context_tracking.h>
+#include <linux/elf.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/errno.h>
#include <linux/ptrace.h>
+#include <linux/regset.h>
#include <linux/smp.h>
#include <linux/user.h>
#include <linux/security.h>
@@ -256,6 +258,133 @@ int ptrace_set_watch_regs(struct task_struct *child,
return 0;
}
+/* 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)
+{
+ struct pt_regs newregs;
+ int ret;
+
+ ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
+ &newregs,
+ 0, sizeof(newregs));
+ if (ret)
+ return ret;
+
+ *task_pt_regs(target) = newregs;
+
+ return 0;
+}
+
+static int fpr_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,
+ &target->thread.fpu,
+ 0, sizeof(elf_fpregset_t));
+ /* XXX fcr31 */
+}
+
+static int fpr_set(struct task_struct *target,
+ const struct user_regset *regset,
+ unsigned int pos, unsigned int count,
+ const void *kbuf, const void __user *ubuf)
+{
+ return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
+ &target->thread.fpu,
+ 0, sizeof(elf_fpregset_t));
+ /* XXX fcr31 */
+}
+
+enum mips_regset {
+ REGSET_GPR,
+ REGSET_FPR,
+};
+
+static const struct user_regset mips_regsets[] = {
+ [REGSET_GPR] = {
+ .core_note_type = NT_PRSTATUS,
+ .n = ELF_NGREG,
+ .size = sizeof(unsigned int),
+ .align = sizeof(unsigned int),
+ .get = gpr_get,
+ .set = gpr_set,
+ },
+ [REGSET_FPR] = {
+ .core_note_type = NT_PRFPREG,
+ .n = ELF_NFPREG,
+ .size = sizeof(elf_fpreg_t),
+ .align = sizeof(elf_fpreg_t),
+ .get = fpr_get,
+ .set = fpr_set,
+ },
+};
+
+static const struct user_regset_view user_mips_view = {
+ .name = "mips",
+ .e_machine = ELF_ARCH,
+ .ei_osabi = ELF_OSABI,
+ .regsets = mips_regsets,
+ .n = ARRAY_SIZE(mips_regsets),
+};
+
+static const struct user_regset mips64_regsets[] = {
+ [REGSET_GPR] = {
+ .core_note_type = NT_PRSTATUS,
+ .n = ELF_NGREG,
+ .size = sizeof(unsigned long),
+ .align = sizeof(unsigned long),
+ .get = gpr_get,
+ .set = gpr_set,
+ },
+ [REGSET_FPR] = {
+ .core_note_type = NT_PRFPREG,
+ .n = ELF_NFPREG,
+ .size = sizeof(elf_fpreg_t),
+ .align = sizeof(elf_fpreg_t),
+ .get = fpr_get,
+ .set = fpr_set,
+ },
+};
+
+static const struct user_regset_view user_mips64_view = {
+ .name = "mips",
+ .e_machine = ELF_ARCH,
+ .ei_osabi = ELF_OSABI,
+ .regsets = mips64_regsets,
+ .n = ARRAY_SIZE(mips_regsets),
+};
+
+const struct user_regset_view *task_user_regset_view(struct task_struct *task)
+{
+#ifdef CONFIG_32BIT
+ return &user_mips_view;
+#endif
+
+#ifdef CONFIG_MIPS32_O32
+ if (test_thread_flag(TIF_32BIT_REGS))
+ return &user_mips_view;
+#endif
+
+ return &user_mips64_view;
+}
+
long arch_ptrace(struct task_struct *child, long request,
unsigned long addr, unsigned long data)
{

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