[PATCH 1/3] arch/tile: implement user_regset interface on tilegx

[Simon Marchi]

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

Signed-off-by: Simon Marchi <simon.mar...@polymtl.ca>
---
I only tested these patches on a 3.0 kernel, as this is what my current
setup allows me. Some testing on more recent versions would be
appreciated, although I don't think the user_regset framework changed
much since then.

Also, I put some ifdefs so that these patches only affect tilegx and not
the older tile architectures, which I don't have access to. Hopefully
someone else can finish the work for those, it's probably not much.

 arch/tile/kernel/ptrace.c |   65 +++++++++++++++++++++++++++++++++++++++++++++
 1 files changed, 65 insertions(+), 0 deletions(-)

diff --git a/arch/tile/kernel/ptrace.c b/arch/tile/kernel/ptrace.c
index b32bc3f..0e68d06 100644
--- a/arch/tile/kernel/ptrace.c
+++ b/arch/tile/kernel/ptrace.c
@@ -19,6 +19,8 @@
 #include <linux/kprobes.h>
 #include <linux/compat.h>
 #include <linux/uaccess.h>
+#include <linux/regset.h>
+#include <linux/elf.h>
 #include <asm/traps.h>
 
 void user_enable_single_step(struct task_struct *child)
@@ -80,6 +82,69 @@ static void putregs(struct task_struct *child, struct 
pt_regs *uregs)
        *regs = *uregs;
 }
 
+#ifdef __tilegx__
+
+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 = "tilegx",
+       .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;
+}
+
+#endif /* __tilegx__ */
+
 long arch_ptrace(struct task_struct *child, long request,
                 unsigned long addr, unsigned long data)
 {
-- 
1.7.1

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