[PATCH v8 1/7] arm64: Add HAVE_REGS_AND_STACK_ACCESS_API feature

[dave.long@linaro.org (David Long)]

From: "David A. Long" <dave.long@linaro.org>

Add HAVE_REGS_AND_STACK_ACCESS_API feature for arm64.

Signed-off-by: David A. Long <dave.long@linaro.org>
---
 arch/arm64/Kconfig              |  1 +
 arch/arm64/include/asm/ptrace.h | 25 +++++++++++++
 arch/arm64/kernel/ptrace.c      | 77 +++++++++++++++++++++++++++++++++++++++++
 3 files changed, 103 insertions(+)

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 318175f..ef5d726 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -70,6 +70,7 @@ config ARM64
 	select HAVE_PERF_EVENTS
 	select HAVE_PERF_REGS
 	select HAVE_PERF_USER_STACK_DUMP
+	select HAVE_REGS_AND_STACK_ACCESS_API
 	select HAVE_RCU_TABLE_FREE
 	select HAVE_SYSCALL_TRACEPOINTS
 	select IRQ_DOMAIN
diff --git a/arch/arm64/include/asm/ptrace.h b/arch/arm64/include/asm/ptrace.h
index d6dd9fd..8f440e9 100644
--- a/arch/arm64/include/asm/ptrace.h
+++ b/arch/arm64/include/asm/ptrace.h
@@ -118,6 +118,8 @@ struct pt_regs {
 	u64 syscallno;
 };
 
+#define MAX_REG_OFFSET (sizeof(struct user_pt_regs) - sizeof(u64))
+
 #define arch_has_single_step()	(1)
 
 #ifdef CONFIG_COMPAT
@@ -146,6 +148,29 @@ struct pt_regs {
 #define user_stack_pointer(regs) \
 	(!compat_user_mode(regs) ? (regs)->sp : (regs)->compat_sp)
 
+/**
+ * regs_get_register() - get register value from its offset
+ * @regs:	   pt_regs from which register value is gotten
+ * @offset:    offset number of the register.
+ *
+ * regs_get_register returns the value of a register whose offset from @regs.
+ * The @offset is the offset of the register in struct pt_regs.
+ * If @offset is bigger than MAX_REG_OFFSET, this returns 0.
+ */
+static inline u64 regs_get_register(struct pt_regs *regs,
+					      unsigned int offset)
+{
+	if (unlikely(offset > MAX_REG_OFFSET))
+		return 0;
+	return *(u64 *)((u64)regs + offset);
+}
+
+/* Valid only for Kernel mode traps. */
+static inline unsigned long kernel_stack_pointer(struct pt_regs *regs)
+{
+	return regs->sp;
+}
+
 static inline unsigned long regs_return_value(struct pt_regs *regs)
 {
 	return regs->regs[0];
diff --git a/arch/arm64/kernel/ptrace.c b/arch/arm64/kernel/ptrace.c
index d882b83..f6199a5 100644
--- a/arch/arm64/kernel/ptrace.c
+++ b/arch/arm64/kernel/ptrace.c
@@ -48,6 +48,83 @@
 #define CREATE_TRACE_POINTS
 #include <trace/events/syscalls.h>
 
+#define ARM_pstate	pstate
+#define ARM_pc		pc
+#define ARM_sp		sp
+#define ARM_x30		regs[30]
+#define ARM_x29		regs[29]
+#define ARM_x28		regs[28]
+#define ARM_x27		regs[27]
+#define ARM_x26		regs[26]
+#define ARM_x25		regs[25]
+#define ARM_x24		regs[24]
+#define ARM_x23		regs[23]
+#define ARM_x22		regs[22]
+#define ARM_x21		regs[21]
+#define ARM_x20		regs[20]
+#define ARM_x19		regs[19]
+#define ARM_x18		regs[18]
+#define ARM_x17		regs[17]
+#define ARM_x16		regs[16]
+#define ARM_x15		regs[15]
+#define ARM_x14		regs[14]
+#define ARM_x13		regs[13]
+#define ARM_x12		regs[12]
+#define ARM_x11		regs[11]
+#define ARM_x10		regs[10]
+#define ARM_x9		regs[9]
+#define ARM_x8		regs[8]
+#define ARM_x7		regs[7]
+#define ARM_x6		regs[6]
+#define ARM_x5		regs[5]
+#define ARM_x4		regs[4]
+#define ARM_x3		regs[3]
+#define ARM_x2		regs[2]
+#define ARM_x1		regs[1]
+#define ARM_x0		regs[0]
+
+#define REG_OFFSET_NAME(r) \
+	{.name = #r, .offset = offsetof(struct pt_regs, ARM_##r)}
+#define REG_OFFSET_END {.name = NULL, .offset = 0}
+
+const struct pt_regs_offset regs_offset_table[] = {
+	REG_OFFSET_NAME(x0),
+	REG_OFFSET_NAME(x1),
+	REG_OFFSET_NAME(x2),
+	REG_OFFSET_NAME(x3),
+	REG_OFFSET_NAME(x4),
+	REG_OFFSET_NAME(x5),
+	REG_OFFSET_NAME(x6),
+	REG_OFFSET_NAME(x7),
+	REG_OFFSET_NAME(x8),
+	REG_OFFSET_NAME(x9),
+	REG_OFFSET_NAME(x10),
+	REG_OFFSET_NAME(x11),
+	REG_OFFSET_NAME(x12),
+	REG_OFFSET_NAME(x13),
+	REG_OFFSET_NAME(x14),
+	REG_OFFSET_NAME(x15),
+	REG_OFFSET_NAME(x16),
+	REG_OFFSET_NAME(x17),
+	REG_OFFSET_NAME(x18),
+	REG_OFFSET_NAME(x19),
+	REG_OFFSET_NAME(x20),
+	REG_OFFSET_NAME(x21),
+	REG_OFFSET_NAME(x22),
+	REG_OFFSET_NAME(x23),
+	REG_OFFSET_NAME(x24),
+	REG_OFFSET_NAME(x25),
+	REG_OFFSET_NAME(x26),
+	REG_OFFSET_NAME(x27),
+	REG_OFFSET_NAME(x28),
+	REG_OFFSET_NAME(x29),
+	REG_OFFSET_NAME(x30),
+	REG_OFFSET_NAME(sp),
+	REG_OFFSET_NAME(pc),
+	REG_OFFSET_NAME(pstate),
+	REG_OFFSET_END,
+};
+
 /*
  * TODO: does not yet catch signals sent when the child dies.
  * in exit.c or in signal.c.
-- 
1.8.1.2