This patch adds following new set of ptrace request macros for miscellaneous
registers expanding the existing ptrace ABI on PowerPC.
/* Miscellaneous registers */
PTRACE_GETMSCREGS
PTRACE_SETMSCREGS
Signed-off-by: Anshuman Khandual <khand...@linux.vnet.ibm.com>
---
arch/powerpc/include/uapi/asm/ptrace.h | 10 ++++
arch/powerpc/kernel/ptrace.c | 91 +++++++++++++++++++++++++++++++++-
2 files changed, 100 insertions(+), 1 deletion(-)
diff --git a/arch/powerpc/include/uapi/asm/ptrace.h
b/arch/powerpc/include/uapi/asm/ptrace.h
index 1a12c36..bce1055 100644
--- a/arch/powerpc/include/uapi/asm/ptrace.h
+++ b/arch/powerpc/include/uapi/asm/ptrace.h
@@ -241,6 +241,16 @@ struct pt_regs {
#define PTRACE_GETTM_CVMXREGS 0x76
#define PTRACE_SETTM_CVMXREGS 0x77
+/* Miscellaneous registers */
+#define PTRACE_GETMSCREGS 0x78
+#define PTRACE_SETMSCREGS 0x79
+
+/*
+ * XXX: A note to application developers. The existing data layout
+ * of the above four ptrace requests can change when new registers
+ * are available for each category in forthcoming processors.
+ */
+
#ifndef __ASSEMBLY__
struct ppc_debug_info {
diff --git a/arch/powerpc/kernel/ptrace.c b/arch/powerpc/kernel/ptrace.c
index 9fbcb6a..2893958 100644
--- a/arch/powerpc/kernel/ptrace.c
+++ b/arch/powerpc/kernel/ptrace.c
@@ -1054,6 +1054,76 @@ 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 {
@@ -1072,8 +1142,9 @@ enum powerpc_regset {
REGSET_TM_SPR, /* TM specific SPR */
REGSET_TM_CGPR, /* TM checkpointed GPR */
REGSET_TM_CFPR, /* TM checkpointed FPR */
- REGSET_TM_CVMX /* TM checkpointed VMX */
+ REGSET_TM_CVMX, /* TM checkpointed VMX */
#endif
+ REGSET_MISC /* Miscellaneous */
};
static const struct user_regset native_regsets[] = {
@@ -1130,6 +1201,11 @@ static const struct user_regset native_regsets[] = {
.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 = {
@@ -1320,6 +1396,11 @@ static const struct user_regset compat_regsets[] = {
.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 = {
@@ -2269,6 +2350,14 @@ long arch_ptrace(struct task_struct *child, long request,
return copy_regset_from_user(child, &user_ppc_native_view,
REGSET_TM_CVMX, 0, (33 *
sizeof(vector128) + sizeof(u32)), datavp);
#endif /* CONFIG_PPC_TRANSACTIONAL_MEM */
+ case PTRACE_GETMSCREGS:
+ return copy_regset_to_user(child, &user_ppc_native_view,
+ REGSET_MISC, 0, 3 * sizeof(u64),
+ datavp);
+ case PTRACE_SETMSCREGS:
+ return copy_regset_from_user(child, &user_ppc_native_view,
+ REGSET_MISC, 0, 3 * sizeof(u64),
+ datavp);
default:
ret = ptrace_request(child, request, addr, data);
break;
--
1.7.11.7
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