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Subject[PATCH 15/17] arm: user_regset: thread pointer in core dumps
Date
This wires up a proper user_regset for the $tp special register.
It will appear in ELF core dumps in its own tiny note of the new
type NT_ARM_TP. The note will be omitted if $tp was 0.

Signed-off-by: Roland McGrath <roland@redhat.com>
---
arch/arm/kernel/ptrace.c | 37 +++++++++++++++++++++++++++++++++++++
include/linux/elf.h | 1 +
2 files changed, 38 insertions(+), 0 deletions(-)

diff --git a/arch/arm/kernel/ptrace.c b/arch/arm/kernel/ptrace.c
index 6ce3deb..1a07257 100644
--- a/arch/arm/kernel/ptrace.c
+++ b/arch/arm/kernel/ptrace.c
@@ -623,6 +623,37 @@ static int user_fp_set(struct task_struct *target,
&thread->fpstate, 0, sizeof(struct user_fp));
}

+/*
+ * Fetch the thread pointer as a regset of its own.
+ * It's considered "active" (i.e. worth dumping) if it's nonzero.
+ */
+
+static int tp_get(struct task_struct *target,
+ const struct user_regset *regset,
+ unsigned int pos, unsigned int count,
+ void *kbuf, void __user *ubuf)
+{
+ return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
+ &task_thread_info(target)->tp_value,
+ 0, sizeof(unsigned long));
+}
+
+static int tp_set(struct task_struct *target,
+ const struct user_regset *regset,
+ unsigned int pos, unsigned int count,
+ const void *kbuf, const void __user *ubuf)
+{
+ return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
+ &task_thread_info(target)->tp_value,
+ 0, sizeof(unsigned long));
+}
+
+static int tp_active(struct task_struct *target,
+ const struct user_regset *regset)
+{
+ return task_thread_info(target)->tp_value == 0 ? 0 : 1;
+}
+
#ifdef CONFIG_IWMMXT

/*
@@ -806,6 +837,7 @@ static int vfp_set(struct task_struct *target,
enum {
REGSET_GPR,
REGSET_FP,
+ REGSET_TP,
#ifdef CONFIG_VFP
REGSET_VFP,
#endif
@@ -829,6 +861,11 @@ static const struct user_regset arm_regsets[] = {
.size = sizeof(long), .align = sizeof(long),
.active = user_fp_active, .get = user_fp_get, .set = user_fp_set
},
+ [REGSET_TP] = {
+ .core_note_type = NT_ARM_TP,
+ .size = sizeof(long), .align = sizeof(long), .n = 1,
+ .active = tp_active, .get = tp_get, .set = tp_set
+ },
#ifdef CONFIG_VFP
[REGSET_VFP] = {
.core_note_type = NT_PRXFPREG,
diff --git a/include/linux/elf.h b/include/linux/elf.h
index 30a7b92..32662e3 100644
--- a/include/linux/elf.h
+++ b/include/linux/elf.h
@@ -363,6 +363,7 @@ typedef struct elf64_shdr {
#define NT_386_IOPERM 0x201 /* x86 io permission bitmap (1=deny) */
#define NT_ARM_WMMX 0x300 /* ARM iWMMXt registers */
#define NT_ARM_CRUNCH 0x301 /* ARM Crunch registers */
+#define NT_ARM_TP 0x302 /* ARM thread pointer */


/* Note header in a PT_NOTE section */

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