[PATCH v11 10/27] powerpc/ptrace: Enable support for NT_PPPC_TAR, NT_PPC_PPR, NT_PPC_DSCR

wei.guo.simon
2016-07-17T02:02:12Z

This patch enables support for running TAR, PPR, DSCR registers
related ELF core notes NT_PPPC_TAR, NT_PPC_PPR, NT_PPC_DSCR based
ptrace requests through PTRACE_GETREGSET, PTRACE_SETREGSET calls.
This is achieved through adding three new register sets REGSET_TAR,
REGSET_PPR, REGSET_DSCR in powerpc corresponding to the ELF core
note sections added in this regad. It implements the get, set and
active functions for all these new register sets added.

Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Shuah Khan <shuahkh@osg.samsung.com>
Cc: Anton Blanchard <anton@samba.org>
Cc: Cyril Bur <cyrilbur@gmail.com>
Cc: Anshuman Khandual <khandual@linux.vnet.ibm.com>
Cc: Simon Guo <wei.guo.simon@gmail.com>
Cc: Ulrich Weigand <ulrich.weigand@de.ibm.com>
Cc: Michael Neuling <mikey@neuling.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Kees Cook <keescook@chromium.org>
Cc: Rashmica Gupta <rashmicy@gmail.com>
Cc: Khem Raj <raj.khem@gmail.com>
Cc: Jessica Yu <jeyu@redhat.com>
Cc: Jiri Kosina <jkosina@suse.cz>
Cc: Miroslav Benes <mbenes@suse.cz>
Cc: Suraj Jitindar Singh <sjitindarsingh@gmail.com>
Cc: Chris Smart <chris@distroguy.com>
Cc: linuxppc-dev@lists.ozlabs.org
Cc: linux-kernel@vger.kernel.org
Cc: linux-kselftest@vger.kernel.org
Signed-off-by: Anshuman Khandual <khandual@linux.vnet.ibm.com>
---
arch/powerpc/kernel/ptrace.c | 117 +++++++++++++++++++++++++++++++++++++++++++
1 file changed, 117 insertions(+)

diff --git a/arch/powerpc/kernel/ptrace.c b/arch/powerpc/kernel/ptrace.c
index f0dcfb5..1a091db 100644
--- a/arch/powerpc/kernel/ptrace.c
+++ b/arch/powerpc/kernel/ptrace.c
@@ -1456,6 +1456,78 @@ static int tm_dscr_set(struct task_struct *target,
}
#endif /* CONFIG_PPC_TRANSACTIONAL_MEM */

+#ifdef CONFIG_PPC64
+static int ppr_get(struct task_struct *target,
+ const struct user_regset *regset,
+ unsigned int pos, unsigned int count,
+ void *kbuf, void __user *ubuf)
+{
+ int ret;
+
+ ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
+ &target->thread.ppr, 0, sizeof(u64));
+ return ret;
+}
+
+static int ppr_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;
+
+ ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
+ &target->thread.ppr, 0, sizeof(u64));
+ return ret;
+}
+
+static int dscr_get(struct task_struct *target,
+ const struct user_regset *regset,
+ unsigned int pos, unsigned int count,
+ void *kbuf, void __user *ubuf)
+{
+ int ret;
+
+ ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
+ &target->thread.dscr, 0, sizeof(u64));
+ return ret;
+}
+static int dscr_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;
+
+ ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
+ &target->thread.dscr, 0, sizeof(u64));
+ return ret;
+}
+#endif
+#ifdef CONFIG_PPC_BOOK3S_64
+static int tar_get(struct task_struct *target,
+ const struct user_regset *regset,
+ unsigned int pos, unsigned int count,
+ void *kbuf, void __user *ubuf)
+{
+ int ret;
+
+ ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
+ &target->thread.tar, 0, sizeof(u64));
+ return ret;
+}
+static int tar_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;
+
+ ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
+ &target->thread.tar, 0, sizeof(u64));
+ return ret;
+}
+#endif
/*
* These are our native regset flavors.
*/
@@ -1481,6 +1553,13 @@ enum powerpc_regset {
REGSET_TM_CPPR, /* TM checkpointed PPR register */
REGSET_TM_CDSCR, /* TM checkpointed DSCR register */
#endif
+#ifdef CONFIG_PPC64
+ REGSET_PPR, /* PPR register */
+ REGSET_DSCR, /* DSCR register */
+#endif
+#ifdef CONFIG_PPC_BOOK3S_64
+ REGSET_TAR, /* TAR register */
+#endif
};

static const struct user_regset native_regsets[] = {
@@ -1557,6 +1636,25 @@ static const struct user_regset native_regsets[] = {
.active = tm_dscr_active, .get = tm_dscr_get, .set = tm_dscr_set
},
#endif
+#ifdef CONFIG_PPC64
+ [REGSET_PPR] = {
+ .core_note_type = NT_PPC_PPR, .n = 1,
+ .size = sizeof(u64), .align = sizeof(u64),
+ .get = ppr_get, .set = ppr_set
+ },
+ [REGSET_DSCR] = {
+ .core_note_type = NT_PPC_DSCR, .n = 1,
+ .size = sizeof(u64), .align = sizeof(u64),
+ .get = dscr_get, .set = dscr_set
+ },
+#endif
+#ifdef CONFIG_PPC_BOOK3S_64
+ [REGSET_TAR] = {
+ .core_note_type = NT_PPC_TAR, .n = 1,
+ .size = sizeof(u64), .align = sizeof(u64),
+ .get = tar_get, .set = tar_set
+ },
+#endif
};

static const struct user_regset_view user_ppc_native_view = {
@@ -1824,6 +1922,25 @@ static const struct user_regset compat_regsets[] = {
.active = tm_dscr_active, .get = tm_dscr_get, .set = tm_dscr_set
},
#endif
+#ifdef CONFIG_PPC64
+ [REGSET_PPR] = {
+ .core_note_type = NT_PPC_PPR, .n = 1,
+ .size = sizeof(u64), .align = sizeof(u64),
+ .get = ppr_get, .set = ppr_set
+ },
+ [REGSET_DSCR] = {
+ .core_note_type = NT_PPC_DSCR, .n = 1,
+ .size = sizeof(u64), .align = sizeof(u64),
+ .get = dscr_get, .set = dscr_set
+ },
+#endif
+#ifdef CONFIG_PPC_BOOK3S_64
+ [REGSET_TAR] = {
+ .core_note_type = NT_PPC_TAR, .n = 1,
+ .size = sizeof(u64), .align = sizeof(u64),
+ .get = tar_get, .set = tar_set
+ },
+#endif
};

static const struct user_regset_view user_ppc_compat_view = {
--
1.8.3.1