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[PATCH V9 13/28] powerpc, ptrace: Enable support for NT_PPPC_TAR, NT_PPC_PPR, NT_PPC_DSCR

From Anshuman Khandual <khandual@linux.vnet.ibm.com>
Newsgroups linux.kernel
Subject [PATCH V9 13/28] powerpc, ptrace: Enable support for NT_PPPC_TAR, NT_PPC_PPR, NT_PPC_DSCR
Date 2015-10-08 17:00 +0200
Message-ID <qhkPN-6FW-49@gated-at.bofh.it> (permalink)
References <qhkG5-6u9-5@gated-at.bofh.it>
Organization linux.* mail to news gateway

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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.

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 45aa204..44aedfb 100644
--- a/arch/powerpc/kernel/ptrace.c
+++ b/arch/powerpc/kernel/ptrace.c
@@ -1688,6 +1688,78 @@ 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.
  */
@@ -1713,6 +1785,13 @@ 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[] = {
@@ -1789,6 +1868,25 @@ 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 = {
@@ -2056,6 +2154,25 @@ 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 = {
-- 
2.1.0

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Thread

[PATCH V9 00/28] Add new powerpc specific ELF core notes Anshuman Khandual <khandual@linux.vnet.ibm.com> - 2015-10-08 16:50 +0200
  [PATCH V9 06/28] powerpc, ptrace: Adapt gpr32_get, gpr32_set functions for transaction Anshuman Khandual <khandual@linux.vnet.ibm.com> - 2015-10-08 16:50 +0200
  [PATCH V9 09/28] powerpc, ptrace: Enable support for NT_PPC_CVMX Anshuman Khandual <khandual@linux.vnet.ibm.com> - 2015-10-08 16:50 +0200
  [PATCH V9 01/28] elf: Add powerpc specific core note sections Anshuman Khandual <khandual@linux.vnet.ibm.com> - 2015-10-08 16:50 +0200
  [PATCH V9 26/28] selftests, powerpc: Add ptrace tests for VSX, VMX registers in suspended TM Anshuman Khandual <khandual@linux.vnet.ibm.com> - 2015-10-08 17:00 +0200
  [PATCH V9 16/28] selftests, powerpc: Add more SPR numbers, TM & VMX instructions to 'reg.h' Anshuman Khandual <khandual@linux.vnet.ibm.com> - 2015-10-08 17:00 +0200
  [PATCH V9 28/28] selftests, powerpc: Add .gitignore file for ptrace executables Anshuman Khandual <khandual@linux.vnet.ibm.com> - 2015-10-08 17:00 +0200
  [PATCH V9 17/28] selftests, powerpc: Add ptrace tests for EBB Anshuman Khandual <khandual@linux.vnet.ibm.com> - 2015-10-08 17:00 +0200
  [PATCH V9 12/28] powerpc, ptrace: Enable NT_PPC_TM_CTAR, NT_PPC_TM_CPPR, NT_PPC_TM_CDSCR Anshuman Khandual <khandual@linux.vnet.ibm.com> - 2015-10-08 17:00 +0200
  [PATCH V9 27/28] selftests, powerpc: Add ptrace tests for TM SPR registers Anshuman Khandual <khandual@linux.vnet.ibm.com> - 2015-10-08 17:00 +0200
  [PATCH V9 08/28] powerpc, ptrace: Enable support for NT_PPC_CFPR Anshuman Khandual <khandual@linux.vnet.ibm.com> - 2015-10-08 17:00 +0200
  [PATCH V9 11/28] powerpc, ptrace: Enable support for TM SPR state Anshuman Khandual <khandual@linux.vnet.ibm.com> - 2015-10-08 17:00 +0200
  [PATCH V9 21/28] selftests, powerpc: Add ptrace tests for TAR, PPR, DSCR registers Anshuman Khandual <khandual@linux.vnet.ibm.com> - 2015-10-08 17:00 +0200
  [PATCH V9 19/28] selftests, powerpc: Add ptrace tests for GPR/FPR registers in TM Anshuman Khandual <khandual@linux.vnet.ibm.com> - 2015-10-08 17:00 +0200
  [PATCH V9 23/28] selftests, powerpc: Add ptrace tests for TAR, PPR, DSCR in suspended TM Anshuman Khandual <khandual@linux.vnet.ibm.com> - 2015-10-08 17:00 +0200
  [PATCH V9 25/28] selftests, powerpc: Add ptrace tests for VSX, VMX registers in TM Anshuman Khandual <khandual@linux.vnet.ibm.com> - 2015-10-08 17:00 +0200
  [PATCH V9 18/28] selftests, powerpc: Add ptrace tests for GPR/FPR registers Anshuman Khandual <khandual@linux.vnet.ibm.com> - 2015-10-08 17:00 +0200
  [PATCH V9 13/28] powerpc, ptrace: Enable support for NT_PPPC_TAR, NT_PPC_PPR, NT_PPC_DSCR Anshuman Khandual <khandual@linux.vnet.ibm.com> - 2015-10-08 17:00 +0200
  [PATCH V9 20/28] selftests, powerpc: Add ptrace tests for GPR/FPR registers in suspended TM Anshuman Khandual <khandual@linux.vnet.ibm.com> - 2015-10-08 17:00 +0200
  [PATCH V9 22/28] selftests, powerpc: Add ptrace tests for TAR, PPR, DSCR in TM Anshuman Khandual <khandual@linux.vnet.ibm.com> - 2015-10-08 17:00 +0200
  [PATCH V9 04/28] powerpc, ptrace: Enable in transaction NT_PPC_VMX ptrace requests Anshuman Khandual <khandual@linux.vnet.ibm.com> - 2015-10-08 17:00 +0200
  [PATCH V9 24/28] selftests, powerpc: Add ptrace tests for VSX, VMX registers Anshuman Khandual <khandual@linux.vnet.ibm.com> - 2015-10-08 17:00 +0200
  [PATCH V9 14/28] powerpc, ptrace: Enable support for EBB registers Anshuman Khandual <khandual@linux.vnet.ibm.com> - 2015-10-08 17:00 +0200
  [PATCH V9 15/28] selftests, powerpc: Move 'reg.h' file outside of 'ebb' sub directory Anshuman Khandual <khandual@linux.vnet.ibm.com> - 2015-10-08 17:00 +0200

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