Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.kernel > #1242489

[PATCH V9 14/28] powerpc, ptrace: Enable support for EBB registers

From Anshuman Khandual <khandual@linux.vnet.ibm.com>
Newsgroups linux.kernel
Subject [PATCH V9 14/28] powerpc, ptrace: Enable support for EBB registers
Date 2015-10-08 17:00 +0200
Message-ID <qhkPN-6FW-55@gated-at.bofh.it> (permalink)
References <qhkG5-6u9-5@gated-at.bofh.it>
Organization linux.* mail to news gateway

Show all headers | View raw

This patch enables support for EBB state registers related
ELF core note NT_PPC_EBB based ptrace requests through
PTRACE_GETREGSET, PTRACE_SETREGSET calls. This is achieved
through adding one new register sets REGSET_EBB in powerpc
corresponding to the ELF core note sections added in this
regard. It also implements the get, set and active functions
for this new register sets added.

Signed-off-by: Anshuman Khandual <khandual@linux.vnet.ibm.com>
---
 arch/powerpc/include/uapi/asm/elf.h |   3 +
 arch/powerpc/kernel/ptrace.c        | 147 ++++++++++++++++++++++++++++++++++++
 2 files changed, 150 insertions(+)

diff --git a/arch/powerpc/include/uapi/asm/elf.h b/arch/powerpc/include/uapi/asm/elf.h
index 9e6b6e3..b849a70 100644
--- a/arch/powerpc/include/uapi/asm/elf.h
+++ b/arch/powerpc/include/uapi/asm/elf.h
@@ -94,6 +94,9 @@
 #define ELF_NVMX	34	/* includes all vector registers */
 #define ELF_NVSX	32	/* includes all VSX registers */
 #define ELF_NTMSPRREG	3	/* include tfhar, tfiar, texasr */
+#define ELF_NEBB	8	/* includes ebbrr, ebbhr, bescr, siar,
+				 * sdar, sier, mmcr2, mmcr0
+				 */
 
 typedef unsigned long elf_greg_t64;
 typedef elf_greg_t64 elf_gregset_t64[ELF_NGREG];
diff --git a/arch/powerpc/kernel/ptrace.c b/arch/powerpc/kernel/ptrace.c
index 44aedfb..b04df17 100644
--- a/arch/powerpc/kernel/ptrace.c
+++ b/arch/powerpc/kernel/ptrace.c
@@ -1759,6 +1759,142 @@ static int tar_set(struct task_struct *target,
 				&target->thread.tar, 0, sizeof(u64));
 	return ret;
 }
+
+static int ebb_active(struct task_struct *target,
+			 const struct user_regset *regset)
+{
+	if (!cpu_has_feature(CPU_FTR_ARCH_207S))
+		return -ENODEV;
+
+	if (target->thread.used_ebb)
+		return regset->n;
+
+	return 0;
+}
+
+static int ebb_get(struct task_struct *target,
+		      const struct user_regset *regset,
+		      unsigned int pos, unsigned int count,
+		      void *kbuf, void __user *ubuf)
+{
+	int ret;
+
+	/* Build tests */
+	BUILD_BUG_ON(TSO(ebbrr) + sizeof(unsigned long) != TSO(ebbhr));
+	BUILD_BUG_ON(TSO(ebbhr) + sizeof(unsigned long) != TSO(bescr));
+	BUILD_BUG_ON(TSO(bescr) + sizeof(unsigned long) != TSO(siar));
+	BUILD_BUG_ON(TSO(siar) + sizeof(unsigned long) != TSO(sdar));
+	BUILD_BUG_ON(TSO(sdar) + sizeof(unsigned long) != TSO(sier));
+	BUILD_BUG_ON(TSO(sier) + sizeof(unsigned long) != TSO(mmcr2));
+	BUILD_BUG_ON(TSO(mmcr2) + sizeof(unsigned long) != TSO(mmcr0));
+
+	if (!cpu_has_feature(CPU_FTR_ARCH_207S))
+		return -ENODEV;
+
+	if (!target->thread.used_ebb)
+		return -ENODATA;
+
+	ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
+			&target->thread.ebbrr, 0, sizeof(unsigned long));
+
+	if (!ret)
+		ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
+			&target->thread.ebbhr, sizeof(unsigned long),
+			2 * sizeof(unsigned long));
+
+	if (!ret)
+		ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
+			&target->thread.bescr,
+			2 * sizeof(unsigned long), 3 * sizeof(unsigned long));
+
+	if (!ret)
+		ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
+			&target->thread.siar, 3 * sizeof(unsigned long),
+			4 * sizeof(unsigned long));
+
+	if (!ret)
+		ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
+			&target->thread.sdar, 4 * sizeof(unsigned long),
+			5 * sizeof(unsigned long));
+
+	if (!ret)
+		ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
+			&target->thread.sier, 5 * sizeof(unsigned long),
+			6 * sizeof(unsigned long));
+
+	if (!ret)
+		ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
+			&target->thread.mmcr2, 6 * sizeof(unsigned long),
+			7 * sizeof(unsigned long));
+
+	if (!ret)
+		ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
+			&target->thread.mmcr0, 7 * sizeof(unsigned long),
+			8 * sizeof(unsigned long));
+	return ret;
+}
+
+static int ebb_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 = 0;
+
+	/* Build tests */
+	BUILD_BUG_ON(TSO(ebbrr) + sizeof(unsigned long) != TSO(ebbhr));
+	BUILD_BUG_ON(TSO(ebbhr) + sizeof(unsigned long) != TSO(bescr));
+	BUILD_BUG_ON(TSO(bescr) + sizeof(unsigned long) != TSO(siar));
+	BUILD_BUG_ON(TSO(siar) + sizeof(unsigned long) != TSO(sdar));
+	BUILD_BUG_ON(TSO(sdar) + sizeof(unsigned long) != TSO(sier));
+	BUILD_BUG_ON(TSO(sier) + sizeof(unsigned long) != TSO(mmcr2));
+	BUILD_BUG_ON(TSO(mmcr2) + sizeof(unsigned long) != TSO(mmcr0));
+
+	if (!cpu_has_feature(CPU_FTR_ARCH_207S))
+		return -ENODEV;
+
+	if (target->thread.used_ebb)
+		return -ENODATA;
+
+	ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
+			&target->thread.ebbrr, 0, sizeof(unsigned long));
+
+	if (!ret)
+		ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
+			&target->thread.ebbhr, sizeof(unsigned long),
+			2 * sizeof(unsigned long));
+
+	if (!ret)
+		ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
+			&target->thread.bescr,
+			2 * sizeof(unsigned long), 3 * sizeof(unsigned long));
+
+	if (!ret)
+		ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
+			&target->thread.siar, 3 * sizeof(unsigned long),
+			4 * sizeof(unsigned long));
+
+	if (!ret)
+		ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
+			&target->thread.sdar, 4 * sizeof(unsigned long),
+			5 * sizeof(unsigned long));
+
+	if (!ret)
+		ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
+			&target->thread.sier, 5 * sizeof(unsigned long),
+			6 * sizeof(unsigned long));
+
+	if (!ret)
+		ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
+			&target->thread.mmcr2, 6 * sizeof(unsigned long),
+			7 * sizeof(unsigned long));
+
+	if (!ret)
+		ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
+			&target->thread.mmcr0, 7 * sizeof(unsigned long),
+			8 * sizeof(unsigned long));
+	return ret;
+}
 #endif
 /*
  * These are our native regset flavors.
@@ -1791,6 +1927,7 @@ enum powerpc_regset {
 #endif
 #ifdef CONFIG_PPC_BOOK3S_64
 	REGSET_TAR,		/* TAR register */
+	REGSET_EBB,		/* EBB registers */
 #endif
 };
 
@@ -1886,6 +2023,11 @@ static const struct user_regset native_regsets[] = {
 		.size = sizeof(u64), .align = sizeof(u64),
 		.get = tar_get, .set = tar_set
 	},
+	[REGSET_EBB] = {
+		.core_note_type = NT_PPC_EBB, .n = ELF_NEBB,
+		.size = sizeof(u64), .align = sizeof(u64),
+		.active = ebb_active, .get = ebb_get, .set = ebb_set
+	},
 #endif
 };
 
@@ -2172,6 +2314,11 @@ static const struct user_regset compat_regsets[] = {
 		.size = sizeof(u64), .align = sizeof(u64),
 		.get = tar_get, .set = tar_set
 	},
+	[REGSET_EBB] = {
+		.core_note_type = NT_PPC_EBB, .n = ELF_NEBB,
+		.size = sizeof(u64), .align = sizeof(u64),
+		.active = ebb_active, .get = ebb_get, .set = ebb_set
+	},
 #endif
 };
 
-- 
2.1.0

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

Back to linux.kernel | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

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

csiph-web