[PATCH v12 03/30] powerpc/ptrace: Enable in transaction NT_PRFPREG ptrace requests
wei.guo.simon at gmail.com
wei.guo.simon at gmail.com
Wed Jul 27 19:26:28 AEST 2016
From: Anshuman Khandual <khandual at linux.vnet.ibm.com>
This patch enables in transaction NT_PRFPREG ptrace requests.
The function fpr_get which gets the running value of all FPR
registers and the function fpr_set which sets the running
value of of all FPR registers work on the running set of FPR
registers whose location will be different if transaction is
active. This patch makes these functions adapt to situations
when the transaction is active.
Cc: Benjamin Herrenschmidt <benh at kernel.crashing.org>
Cc: Paul Mackerras <paulus at samba.org>
Cc: Michael Ellerman <mpe at ellerman.id.au>
Cc: Shuah Khan <shuahkh at osg.samsung.com>
Cc: Anton Blanchard <anton at samba.org>
Cc: Cyril Bur <cyrilbur at gmail.com>
Cc: Anshuman Khandual <khandual at linux.vnet.ibm.com>
Cc: Simon Guo <wei.guo.simon at gmail.com>
Cc: Ulrich Weigand <ulrich.weigand at de.ibm.com>
Cc: Michael Neuling <mikey at neuling.org>
Cc: Andrew Morton <akpm at linux-foundation.org>
Cc: Kees Cook <keescook at chromium.org>
Cc: Rashmica Gupta <rashmicy at gmail.com>
Cc: Khem Raj <raj.khem at gmail.com>
Cc: Jessica Yu <jeyu at redhat.com>
Cc: Jiri Kosina <jkosina at suse.cz>
Cc: Miroslav Benes <mbenes at suse.cz>
Cc: Suraj Jitindar Singh <sjitindarsingh at gmail.com>
Cc: Chris Smart <chris at distroguy.com>
Cc: linuxppc-dev at lists.ozlabs.org
Cc: linux-kernel at vger.kernel.org
Cc: linux-kselftest at vger.kernel.org
Signed-off-by: Anshuman Khandual <khandual at linux.vnet.ibm.com>
---
arch/powerpc/kernel/ptrace.c | 93 ++++++++++++++++++++++++++++++++++++++++++--
1 file changed, 89 insertions(+), 4 deletions(-)
diff --git a/arch/powerpc/kernel/ptrace.c b/arch/powerpc/kernel/ptrace.c
index 060b140..82db082 100644
--- a/arch/powerpc/kernel/ptrace.c
+++ b/arch/powerpc/kernel/ptrace.c
@@ -358,6 +358,29 @@ static int gpr_set(struct task_struct *target, const struct user_regset *regset,
return ret;
}
+/*
+ * When the transaction is active, 'transact_fp' holds the current running
+ * value of all FPR registers and 'fp_state' holds the last checkpointed
+ * value of all FPR registers for the current transaction. When transaction
+ * is not active 'fp_state' holds the current running state of all the FPR
+ * registers. So this function which returns the current running values of
+ * all the FPR registers, needs to know whether any transaction is active
+ * or not.
+ *
+ * Userspace interface buffer layout:
+ *
+ * struct data {
+ * u64 fpr[32];
+ * u64 fpscr;
+ * };
+ *
+ * There are two config options CONFIG_VSX and CONFIG_PPC_TRANSACTIONAL_MEM
+ * which determines the final code in this function. All the combinations of
+ * these two config options are possible except the one below as transactional
+ * memory config pulls in CONFIG_VSX automatically.
+ *
+ * !defined(CONFIG_VSX) && defined(CONFIG_PPC_TRANSACTIONAL_MEM)
+ */
static int fpr_get(struct task_struct *target, const struct user_regset *regset,
unsigned int pos, unsigned int count,
void *kbuf, void __user *ubuf)
@@ -368,14 +391,31 @@ static int fpr_get(struct task_struct *target, const struct user_regset *regset,
#endif
flush_fp_to_thread(target);
-#ifdef CONFIG_VSX
+#if defined(CONFIG_VSX) && defined(CONFIG_PPC_TRANSACTIONAL_MEM)
+ /* copy to local buffer then write that out */
+ if (MSR_TM_ACTIVE(target->thread.regs->msr)) {
+ flush_altivec_to_thread(target);
+ flush_tmregs_to_thread(target);
+ for (i = 0; i < 32 ; i++)
+ buf[i] = target->thread.TS_TRANS_FPR(i);
+ buf[32] = target->thread.transact_fp.fpscr;
+ } else {
+ for (i = 0; i < 32 ; i++)
+ buf[i] = target->thread.TS_FPR(i);
+ buf[32] = target->thread.fp_state.fpscr;
+ }
+ return user_regset_copyout(&pos, &count, &kbuf, &ubuf, buf, 0, -1);
+#endif
+
+#if defined(CONFIG_VSX) && !defined(CONFIG_PPC_TRANSACTIONAL_MEM)
/* copy to local buffer then write that out */
for (i = 0; i < 32 ; i++)
buf[i] = target->thread.TS_FPR(i);
buf[32] = target->thread.fp_state.fpscr;
return user_regset_copyout(&pos, &count, &kbuf, &ubuf, buf, 0, -1);
+#endif
-#else
+#if !defined(CONFIG_VSX) && !defined(CONFIG_PPC_TRANSACTIONAL_MEM)
BUILD_BUG_ON(offsetof(struct thread_fp_state, fpscr) !=
offsetof(struct thread_fp_state, fpr[32]));
@@ -384,6 +424,29 @@ static int fpr_get(struct task_struct *target, const struct user_regset *regset,
#endif
}
+/*
+ * When the transaction is active, 'transact_fp' holds the current running
+ * value of all FPR registers and 'fp_state' holds the last checkpointed
+ * value of all FPR registers for the current transaction. When transaction
+ * is not active 'fp_state' holds the current running state of all the FPR
+ * registers. So this function which setss the current running values of
+ * all the FPR registers, needs to know whether any transaction is active
+ * or not.
+ *
+ * Userspace interface buffer layout:
+ *
+ * struct data {
+ * u64 fpr[32];
+ * u64 fpscr;
+ * };
+ *
+ * There are two config options CONFIG_VSX and CONFIG_PPC_TRANSACTIONAL_MEM
+ * which determines the final code in this function. All the combinations of
+ * these two config options are possible except the one below as transactional
+ * memory config pulls in CONFIG_VSX automatically.
+ *
+ * !defined(CONFIG_VSX) && defined(CONFIG_PPC_TRANSACTIONAL_MEM)
+ */
static int fpr_set(struct task_struct *target, const struct user_regset *regset,
unsigned int pos, unsigned int count,
const void *kbuf, const void __user *ubuf)
@@ -394,7 +457,27 @@ static int fpr_set(struct task_struct *target, const struct user_regset *regset,
#endif
flush_fp_to_thread(target);
-#ifdef CONFIG_VSX
+#if defined(CONFIG_VSX) && defined(CONFIG_PPC_TRANSACTIONAL_MEM)
+ /* copy to local buffer then write that out */
+ i = user_regset_copyin(&pos, &count, &kbuf, &ubuf, buf, 0, -1);
+ if (i)
+ return i;
+
+ if (MSR_TM_ACTIVE(target->thread.regs->msr)) {
+ flush_altivec_to_thread(target);
+ flush_tmregs_to_thread(target);
+ for (i = 0; i < 32 ; i++)
+ target->thread.TS_TRANS_FPR(i) = buf[i];
+ target->thread.transact_fp.fpscr = buf[32];
+ } else {
+ for (i = 0; i < 32 ; i++)
+ target->thread.TS_FPR(i) = buf[i];
+ target->thread.fp_state.fpscr = buf[32];
+ }
+ return 0;
+#endif
+
+#if defined(CONFIG_VSX) && !defined(CONFIG_PPC_TRANSACTIONAL_MEM)
/* copy to local buffer then write that out */
i = user_regset_copyin(&pos, &count, &kbuf, &ubuf, buf, 0, -1);
if (i)
@@ -403,7 +486,9 @@ static int fpr_set(struct task_struct *target, const struct user_regset *regset,
target->thread.TS_FPR(i) = buf[i];
target->thread.fp_state.fpscr = buf[32];
return 0;
-#else
+#endif
+
+#if !defined(CONFIG_VSX) && !defined(CONFIG_PPC_TRANSACTIONAL_MEM)
BUILD_BUG_ON(offsetof(struct thread_fp_state, fpscr) !=
offsetof(struct thread_fp_state, fpr[32]));
--
1.8.3.1
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