ARM: 6199/1: Add kprobe-based event tracer

This patch enables the HAVE_REGS_AND_STACK_ACCESS_API option
for ARM which is required by the kprobe events tracer. Code based
on the PowerPC port.

Cc: Jean Pihet <jpihet@mvista.com>
Tested-by: Jamie Iles <jamie.iles@picochip.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 96 insertions, 0 deletions

diff --git a/arch/arm/kernel/ptrace.c b/arch/arm/kernel/ptrace.c
index 3f562a7c0a9..f99d489822d 100644
--- a/arch/arm/kernel/ptrace.c
+++ b/arch/arm/kernel/ptrace.c
@@ -52,6 +52,102 @@
 #define BREAKINST_THUMB 0xde01
 #endif
 
+struct pt_regs_offset {
+        const char *name;
+        int offset;
+};
+
+#define REG_OFFSET_NAME(r) \
+        {.name = #r, .offset = offsetof(struct pt_regs, ARM_##r)}
+#define REG_OFFSET_END {.name = NULL, .offset = 0}
+
+static const struct pt_regs_offset regoffset_table[] = {
+        REG_OFFSET_NAME(r0),
+        REG_OFFSET_NAME(r1),
+        REG_OFFSET_NAME(r2),
+        REG_OFFSET_NAME(r3),
+        REG_OFFSET_NAME(r4),
+        REG_OFFSET_NAME(r5),
+        REG_OFFSET_NAME(r6),
+        REG_OFFSET_NAME(r7),
+        REG_OFFSET_NAME(r8),
+        REG_OFFSET_NAME(r9),
+        REG_OFFSET_NAME(r10),
+        REG_OFFSET_NAME(fp),
+        REG_OFFSET_NAME(ip),
+        REG_OFFSET_NAME(sp),
+        REG_OFFSET_NAME(lr),
+        REG_OFFSET_NAME(pc),
+        REG_OFFSET_NAME(cpsr),
+        REG_OFFSET_NAME(ORIG_r0),
+        REG_OFFSET_END,
+};
+
+/**
+ * regs_query_register_offset() - query register offset from its name
+ * @name:       the name of a register
+ *
+ * regs_query_register_offset() returns the offset of a register in struct
+ * pt_regs from its name. If the name is invalid, this returns -EINVAL;
+ */
+int regs_query_register_offset(const char *name)
+{
+        const struct pt_regs_offset *roff;
+        for (roff = regoffset_table; roff->name != NULL; roff++)
+                if (!strcmp(roff->name, name))
+                        return roff->offset;
+        return -EINVAL;
+}
+
+/**
+ * regs_query_register_name() - query register name from its offset
+ * @offset:     the offset of a register in struct pt_regs.
+ *
+ * regs_query_register_name() returns the name of a register from its
+ * offset in struct pt_regs. If the @offset is invalid, this returns NULL;
+ */
+const char *regs_query_register_name(unsigned int offset)
+{
+        const struct pt_regs_offset *roff;
+        for (roff = regoffset_table; roff->name != NULL; roff++)
+                if (roff->offset == offset)
+                        return roff->name;
+        return NULL;
+}
+
+/**
+ * regs_within_kernel_stack() - check the address in the stack
+ * @regs:      pt_regs which contains kernel stack pointer.
+ * @addr:      address which is checked.
+ *
+ * regs_within_kernel_stack() checks @addr is within the kernel stack page(s).
+ * If @addr is within the kernel stack, it returns true. If not, returns false.
+ */
+bool regs_within_kernel_stack(struct pt_regs *regs, unsigned long addr)
+{
+        return ((addr & ~(THREAD_SIZE - 1))  ==
+                (kernel_stack_pointer(regs) & ~(THREAD_SIZE - 1)));
+}
+
+/**
+ * regs_get_kernel_stack_nth() - get Nth entry of the stack
+ * @regs:       pt_regs which contains kernel stack pointer.
+ * @n:          stack entry number.
+ *
+ * regs_get_kernel_stack_nth() returns @n th entry of the kernel stack which
+ * is specified by @regs. If the @n th entry is NOT in the kernel stack,
+ * this returns 0.
+ */
+unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs, unsigned int n)
+{
+        unsigned long *addr = (unsigned long *)kernel_stack_pointer(regs);
+        addr += n;
+        if (regs_within_kernel_stack(regs, (unsigned long)addr))
+                return *addr;
+        else
+                return 0;
+}
+
 /*
  * this routine will get a word off of the processes privileged stack.
  * the offset is how far from the base addr as stored in the THREAD.