arch/tile: implement user_regset interface on tile

This is a basic implementation of user_regset for the tile
architecture. It reuses the basic blocks that were already there.

Signed-off-by: Simon Marchi <simon.marchi@polymtl.ca>
Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>

1 files changed, 62 insertions, 0 deletions

diff --git a/arch/tile/kernel/ptrace.c b/arch/tile/kernel/ptrace.c
index b32bc3f9d631..882e38164773 100644
--- a/arch/tile/kernel/ptrace.c
+++ b/arch/tile/kernel/ptrace.c
@@ -19,7 +19,10 @@
 #include <linux/kprobes.h>
 #include <linux/compat.h>
 #include <linux/uaccess.h>
+#include <linux/regset.h>
+#include <linux/elf.h>
 #include <asm/traps.h>
+#include <arch/chip.h>
 
 void user_enable_single_step(struct task_struct *child)
 {
@@ -80,6 +83,65 @@ static void putregs(struct task_struct *child, struct pt_regs *uregs)
         *regs = *uregs;
 }
 
+enum tile_regset {
+        REGSET_GPR,
+};
+
+static int tile_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;
+
+        getregs(target, &regs);
+
+        return user_regset_copyout(&pos, &count, &kbuf, &ubuf, &regs, 0,
+                                   sizeof(regs));
+}
+
+static int tile_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 regs;
+
+        ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &regs, 0,
+                                 sizeof(regs));
+        if (ret)
+                return ret;
+
+        putregs(target, &regs);
+
+        return 0;
+}
+
+static const struct user_regset tile_user_regset[] = {
+        [REGSET_GPR] = {
+                .core_note_type = NT_PRSTATUS,
+                .n = ELF_NGREG,
+                .size = sizeof(elf_greg_t),
+                .align = sizeof(elf_greg_t),
+                .get = tile_gpr_get,
+                .set = tile_gpr_set,
+        },
+};
+
+static const struct user_regset_view tile_user_regset_view = {
+        .name = CHIP_ARCH_NAME,
+        .e_machine = ELF_ARCH,
+        .ei_osabi = ELF_OSABI,
+        .regsets = tile_user_regset,
+        .n = ARRAY_SIZE(tile_user_regset),
+};
+
+const struct user_regset_view *task_user_regset_view(struct task_struct *task)
+{
+        return &tile_user_regset_view;
+}
+
 long arch_ptrace(struct task_struct *child, long request,
                  unsigned long addr, unsigned long data)
 {