Hi Michael,
Michael Neuling wrote:
Index: linux-2.6-tip/arch/powerpc/include/asm/ptrace.h
===================================================================
--- linux-2.6-tip.orig/arch/powerpc/include/asm/ptrace.h
+++ linux-2.6-tip/arch/powerpc/include/asm/ptrace.h
@@ -83,6 +83,7 @@ struct pt_regs {
#define instruction_pointer(regs) ((regs)->nip)
#define user_stack_pointer(regs) ((regs)->gpr[1])
+#define kernel_stack_pointer(regs) ((regs)->gpr[1])
#define regs_return_value(regs) ((regs)->gpr[3])
#ifdef CONFIG_SMP
@@ -131,6 +132,69 @@ do {
\
} while (0)
#endif /* __powerpc64__ */
+/* Query offset/name of register from its name/offset */
+#include <linux/stddef.h>
+#include <linux/thread_info.h>
Includes should be at the start of the file
The compilation throws many errors when moved to start of the file. This
file has lots of #ifdef and found this place to be perfect for compilation.
+/**
+ * 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;
+}
+
+static const int arg_offs_table[] = {
+ [0] = offsetof(struct pt_regs, gpr[3]),
+ [1] = offsetof(struct pt_regs, gpr[4]),
+ [2] = offsetof(struct pt_regs, gpr[5]),
+ [3] = offsetof(struct pt_regs, gpr[6]),
+ [4] = offsetof(struct pt_regs, gpr[7]),
+ [5] = offsetof(struct pt_regs, gpr[8]),
+ [6] = offsetof(struct pt_regs, gpr[9]),
+ [7] = offsetof(struct pt_regs, gpr[10])
+};
+
+/**
+ * regs_get_argument_nth() - get Nth argument at function call
+ * @regs: pt_regs which contains registers at function entry.
+ * @n: argument number.
+ *
+ * regs_get_argument_nth() returns @n th argument of a function call.
+ * Since usually the kernel stack will be changed right after function entry
,
+ * you must use this at function entry. If the @n th entry is NOT in the
+ * kernel stack or pt_regs, this returns 0.
+ */
+unsigned long regs_get_argument_nth(struct pt_regs *regs, unsigned int n)
+{
+ if (n < ARRAY_SIZE(arg_offs_table))
+ return *(unsigned long *)((char *)regs + arg_offs_table[n]);
+ else {
+ /*
+ * If more arguments are passed that can be stored in
+ * registers, the remaining arguments are stored in the
+ * parameter save area located at fixed offset from stack
+ * pointer.
+ * Following the PowerPC ABI, the first few arguments are
+ * actually passed in registers (r3-r10), with equivalent space
+ * left unused in the parameter save area.
+ */
+ n += (PARAMETER_SAVE_AREA_OFFSET / sizeof(unsigned long));
+ return regs_get_kernel_stack_nth(regs, n);
How do we handle FP args?
Currently this patch does not support FP args.
+ }
+}
+/*
* does not yet catch signals sent when the child dies.
* in exit.c or in signal.c.
*/
Index: linux-2.6-tip/kernel/trace/Kconfig
===================================================================
--- linux-2.6-tip.orig/kernel/trace/Kconfig
+++ linux-2.6-tip/kernel/trace/Kconfig
@@ -464,7 +464,7 @@ config BLK_DEV_IO_TRACE
config KPROBE_EVENT
depends on KPROBES
- depends on X86
+ depends on X86 || PPC
bool "Enable kprobes-based dynamic events"
select TRACING
default y
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Thanks for reviewing.
Thanks,
-Mahesh.
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