kernel_ppc: Save caller's stack pointer in arch_debug_save_registers

Suggested by Ingo in ticket #6139. Code is adapted from x86.
Note that on ppc64 GPR1 needs to be 64-bit, thus the choice of addr_t.

Resolves part of ticket #6160.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@37281 a95241bf-73f2-0310-859d-f6bbb57e9c96

headers/private/kernel/arch/ppc/arch_debug.h

@@ -10,6 +10,7 @@
 
 
 struct arch_debug_registers {
+	addr_t r1;
 };
 
 

src/system/kernel/arch/ppc/arch_debug.cpp

@@ -258,6 +258,9 @@ return 0;
 void
 arch_debug_save_registers(struct arch_debug_registers* registers)
 {
+	// get the caller's frame pointer
+	stack_frame* frame = (stack_frame*)get_current_stack_frame();
+	registers->r1 = (addr_t)frame->previous;
 }