x86: x86 user_regset general regs

This adds accessor functions in the user_regset style for
the general registers (struct user_regs_struct).

Signed-off-by: Roland McGrath <roland@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

diff --git a/arch/x86/kernel/ptrace.c b/arch/x86/kernel/ptrace.c
index 084805ab73231386afe3df0dc76a59e4a7faf35a..ef349ff170a7d7860160f647ffb6f46eb0a0b4bc 100644 (file)
--- a/arch/x86/kernel/ptrace.c
+++ b/arch/x86/kernel/ptrace.c
@@ -13,6 +13,7 @@
 #include <linux/smp.h>
 #include <linux/errno.h>
 #include <linux/ptrace.h>
+#include <linux/regset.h>
 #include <linux/user.h>
 #include <linux/security.h>
 #include <linux/audit.h>
@@ -368,6 +369,59 @@ static unsigned long getreg(struct task_struct *task, unsigned long offset)
        return *pt_regs_access(task_pt_regs(task), offset);
 }
 
+static int genregs_get(struct task_struct *target,
+                      const struct user_regset *regset,
+                      unsigned int pos, unsigned int count,
+                      void *kbuf, void __user *ubuf)
+{
+       if (kbuf) {
+               unsigned long *k = kbuf;
+               while (count > 0) {
+                       *k++ = getreg(target, pos);
+                       count -= sizeof(*k);
+                       pos += sizeof(*k);
+               }
+       } else {
+               unsigned long __user *u = ubuf;
+               while (count > 0) {
+                       if (__put_user(getreg(target, pos), u++))
+                               return -EFAULT;
+                       count -= sizeof(*u);
+                       pos += sizeof(*u);
+               }
+       }
+
+       return 0;
+}
+
+static int genregs_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 = 0;
+       if (kbuf) {
+               const unsigned long *k = kbuf;
+               while (count > 0 && !ret) {
+                       ret = putreg(target, pos, *k++);
+                       count -= sizeof(*k);
+                       pos += sizeof(*k);
+               }
+       } else {
+               const unsigned long  __user *u = ubuf;
+               while (count > 0 && !ret) {
+                       unsigned long word;
+                       ret = __get_user(word, u++);
+                       if (ret)
+                               break;
+                       ret = putreg(target, pos, word);
+                       count -= sizeof(*u);
+                       pos += sizeof(*u);
+               }
+       }
+       return ret;
+}
+
 /*
  * This function is trivial and will be inlined by the compiler.
  * Having it separates the implementation details of debug
@@ -1008,6 +1062,61 @@ static int getreg32(struct task_struct *child, unsigned regno, u32 *val)
 #undef R32
 #undef SEG32
 
+static int genregs32_get(struct task_struct *target,
+                        const struct user_regset *regset,
+                        unsigned int pos, unsigned int count,
+                        void *kbuf, void __user *ubuf)
+{
+       if (kbuf) {
+               compat_ulong_t *k = kbuf;
+               while (count > 0) {
+                       getreg32(target, pos, k++);
+                       count -= sizeof(*k);
+                       pos += sizeof(*k);
+               }
+       } else {
+               compat_ulong_t __user *u = ubuf;
+               while (count > 0) {
+                       compat_ulong_t word;
+                       getreg32(target, pos, &word);
+                       if (__put_user(word, u++))
+                               return -EFAULT;
+                       count -= sizeof(*u);
+                       pos += sizeof(*u);
+               }
+       }
+
+       return 0;
+}
+
+static int genregs32_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 = 0;
+       if (kbuf) {
+               const compat_ulong_t *k = kbuf;
+               while (count > 0 && !ret) {
+                       ret = putreg(target, pos, *k++);
+                       count -= sizeof(*k);
+                       pos += sizeof(*k);
+               }
+       } else {
+               const compat_ulong_t __user *u = ubuf;
+               while (count > 0 && !ret) {
+                       compat_ulong_t word;
+                       ret = __get_user(word, u++);
+                       if (ret)
+                               break;
+                       ret = putreg(target, pos, word);
+                       count -= sizeof(*u);
+                       pos += sizeof(*u);
+               }
+       }
+       return ret;
+}
+
 static long ptrace32_siginfo(unsigned request, u32 pid, u32 addr, u32 data)
 {
        siginfo_t __user *si = compat_alloc_user_space(sizeof(siginfo_t));