This patch enables get and set of miscellaneous registers through ptrace
PTRACE_GETREGSET/PTRACE_SETREGSET interface by implementing new powerpc
specific register set REGSET_MISC support corresponding to the new ELF
core note NT_PPC_MISC added previously in this regard.
Signed-off-by: Anshuman Khandual <khand...@linux.vnet.ibm.com>
---
arch/powerpc/kernel/ptrace.c | 81 ++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 81 insertions(+)
diff --git a/arch/powerpc/kernel/ptrace.c b/arch/powerpc/kernel/ptrace.c
index 17642ef..63b883a 100644
--- a/arch/powerpc/kernel/ptrace.c
+++ b/arch/powerpc/kernel/ptrace.c
@@ -1149,6 +1149,76 @@ static int tm_cvmx_set(struct task_struct *target, const
struct user_regset *reg
#endif /* CONFIG_PPC_TRANSACTIONAL_MEM */
/*
+ * Miscellaneous Registers
+ *
+ * struct {
+ * unsigned long dscr;
+ * unsigned long ppr;
+ * unsigned long tar;
+ * };
+ */
+static int misc_get(struct task_struct *target, const struct user_regset
*regset,
+ unsigned int pos, unsigned int count,
+ void *kbuf, void __user *ubuf)
+{
+ int ret;
+
+ /* DSCR register */
+ ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
+ &target->thread.dscr, 0,
+ sizeof(unsigned long));
+
+ BUILD_BUG_ON(offsetof(struct thread_struct, dscr) + sizeof(unsigned
long) +
+ sizeof(unsigned long) != offsetof(struct
thread_struct, ppr));
+
+ /* PPR register */
+ if (!ret)
+ ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
+ &target->thread.ppr, sizeof(unsigned
long),
+ 2 * sizeof(unsigned long));
+
+ BUILD_BUG_ON(offsetof(struct thread_struct, ppr) + sizeof(unsigned long)
+ != offsetof(struct
thread_struct, tar));
+ /* TAR register */
+ if (!ret)
+ ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
+ &target->thread.tar, 2 *
sizeof(unsigned long),
+ 3 * sizeof(unsigned long));
+ return ret;
+}
+
+static int misc_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;
+
+ /* DSCR register */
+ ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
+ &target->thread.dscr, 0,
+ sizeof(unsigned long));
+
+ BUILD_BUG_ON(offsetof(struct thread_struct, dscr) + sizeof(unsigned
long) +
+ sizeof(unsigned long) != offsetof(struct thread_struct,
ppr));
+
+ /* PPR register */
+ if (!ret)
+ ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
+ &target->thread.ppr,
sizeof(unsigned long),
+ 2 * sizeof(unsigned long));
+
+ BUILD_BUG_ON(offsetof(struct thread_struct, ppr) + sizeof(unsigned long)
+ != offsetof(struct
thread_struct, tar));
+
+ /* TAR register */
+ if (!ret)
+ ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
+ &target->thread.tar, 2 *
sizeof(unsigned long),
+ 3 * sizeof(unsigned long));
+ return ret;
+}
+
+/*
* These are our native regset flavors.
*/
enum powerpc_regset {
@@ -1169,6 +1239,7 @@ enum powerpc_regset {
REGSET_TM_CFPR, /* TM checkpointed FPR */
REGSET_TM_CVMX, /* TM checkpointed VMX */
#endif
+ REGSET_MISC /* Miscellaneous */
};
static const struct user_regset native_regsets[] = {
@@ -1225,6 +1296,11 @@ static const struct user_regset native_regsets[] = {
.active = tm_cvmx_active, .get = tm_cvmx_get, .set = tm_cvmx_set
},
#endif
+ [REGSET_MISC] = {
+ .core_note_type = NT_PPC_MISC, .n = 3,
+ .size = sizeof(u64), .align = sizeof(u64),
+ .get = misc_get, .set = misc_set
+ },
};
static const struct user_regset_view user_ppc_native_view = {
@@ -1566,6 +1642,11 @@ static const struct user_regset compat_regsets[] = {
.active = tm_cvmx_active, .get = tm_cvmx_get, .set = tm_cvmx_set
},
#endif
+ [REGSET_MISC] = {
+ .core_note_type = NT_PPC_MISC, .n = 3,
+ .size = sizeof(u64), .align = sizeof(u64),
+ .get = misc_get, .set = misc_set
+ },
};
static const struct user_regset_view user_ppc_compat_view = {
--
1.7.11.7
_______________________________________________
Linuxppc-dev mailing list
Linuxppc-dev@lists.ozlabs.org
https://lists.ozlabs.org/listinfo/linuxppc-dev
