[POWERPC] Use user_regset accessors for GPRs

This implements user_regset-style accessors for the powerpc general
registers.  In the future these functions will be the only place that
needs to understand the user_regset layout (core dump format) and how
it maps to the internal representation of user thread state.

Signed-off-by: Roland McGrath <roland@redhat.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>

1 files changed, 91 insertions, 0 deletions

diff --git a/arch/powerpc/kernel/ptrace.c b/arch/powerpc/kernel/ptrace.c
index 4edc1186f6a..d9b952faee7 100644
--- a/arch/powerpc/kernel/ptrace.c
+++ b/arch/powerpc/kernel/ptrace.c
@@ -119,6 +119,97 @@ int ptrace_put_reg(struct task_struct *task, int regno, unsigned long data)
         return -EIO;
 }
 
+static int gpr_get(struct task_struct *target, const struct user_regset *regset,
+                   unsigned int pos, unsigned int count,
+                   void *kbuf, void __user *ubuf)
+{
+        int ret;
+
+        if (target->thread.regs == NULL)
+                return -EIO;
+
+        CHECK_FULL_REGS(target->thread.regs);
+
+        ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
+                                  target->thread.regs,
+                                  0, offsetof(struct pt_regs, msr));
+        if (!ret) {
+                unsigned long msr = get_user_msr(target);
+                ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, &msr,
+                                          offsetof(struct pt_regs, msr),
+                                          offsetof(struct pt_regs, msr) +
+                                          sizeof(msr));
+        }
+
+        BUILD_BUG_ON(offsetof(struct pt_regs, orig_gpr3) !=
+                     offsetof(struct pt_regs, msr) + sizeof(long));
+
+        if (!ret)
+                ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
+                                          &target->thread.regs->orig_gpr3,
+                                          offsetof(struct pt_regs, orig_gpr3),
+                                          sizeof(struct pt_regs));
+        if (!ret)
+                ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
+                                               sizeof(struct pt_regs), -1);
+
+        return ret;
+}
+
+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)
+{
+        unsigned long reg;
+        int ret;
+
+        if (target->thread.regs == NULL)
+                return -EIO;
+
+        CHECK_FULL_REGS(target->thread.regs);
+
+        ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
+                                 target->thread.regs,
+                                 0, PT_MSR * sizeof(reg));
+
+        if (!ret && count > 0) {
+                ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &reg,
+                                         PT_MSR * sizeof(reg),
+                                         (PT_MSR + 1) * sizeof(reg));
+                if (!ret)
+                        ret = set_user_msr(target, reg);
+        }
+
+        BUILD_BUG_ON(offsetof(struct pt_regs, orig_gpr3) !=
+                     offsetof(struct pt_regs, msr) + sizeof(long));
+
+        if (!ret)
+                ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
+                                         &target->thread.regs->orig_gpr3,
+                                         PT_ORIG_R3 * sizeof(reg),
+                                         (PT_MAX_PUT_REG + 1) * sizeof(reg));
+
+        if (PT_MAX_PUT_REG + 1 < PT_TRAP && !ret)
+                ret = user_regset_copyin_ignore(
+                        &pos, &count, &kbuf, &ubuf,
+                        (PT_MAX_PUT_REG + 1) * sizeof(reg),
+                        PT_TRAP * sizeof(reg));
+
+        if (!ret && count > 0) {
+                ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &reg,
+                                         PT_TRAP * sizeof(reg),
+                                         (PT_TRAP + 1) * sizeof(reg));
+                if (!ret)
+                        ret = set_user_trap(target, reg);
+        }
+
+        if (!ret)
+                ret = user_regset_copyin_ignore(
+                        &pos, &count, &kbuf, &ubuf,
+                        (PT_TRAP + 1) * sizeof(reg), -1);
+
+        return ret;
+}
 
 static int fpr_get(struct task_struct *target, const struct user_regset *regset,
                    unsigned int pos, unsigned int count,