Added temporary stack trace function to x86_64.

Will be merged with the x86 one later on. Requires -fno-omit-frame-pointer on
the kernel build flags, GCC defaults to not generating stack frames on x86_64.

build/jam/BuildSetup

@@ -391,8 +391,10 @@ switch $(HAIKU_ARCH) {
 		# Kernel lives in the top 2GB of the address space, use kernel code
 		# model. Also disable the red zone, which cannot be used in kernel
 		# code due to interrupts.
-		HAIKU_KERNEL_CCFLAGS += -mcmodel=kernel -mno-red-zone ;
-		HAIKU_KERNEL_C++FLAGS += -mcmodel=kernel -mno-red-zone ;
+		HAIKU_KERNEL_CCFLAGS += -mcmodel=kernel -mno-red-zone
+			-fno-omit-frame-pointer ;
+		HAIKU_KERNEL_C++FLAGS += -mcmodel=kernel -mno-red-zone
+			-fno-omit-frame-pointer ;
 		HAIKU_KERNEL_PIC_LINKFLAGS += -z max-page-size=0x1000 ;
 
 		# Bootloader is 32-bit.

src/system/kernel/arch/x86/64/arch.S

@@ -32,6 +32,13 @@ FUNCTION(x86_fxsave_swap):
 FUNCTION_END(x86_fxsave_swap)
 
 
+/* addr_t x86_read_ebp(); */
+FUNCTION(x86_read_ebp):
+	mov		%rbp, %rax
+	ret
+FUNCTION_END(x86_read_ebp)
+
+
 /* uint64 x86_read_msr(uint32 register); */
 FUNCTION(x86_read_msr):
 	mov		%edi, %ecx

src/system/kernel/arch/x86/64/stubs.cpp

@@ -85,10 +85,32 @@ arch_debug_save_registers(struct arch_debug_registers* registers)
 }
 
 
+struct stack_frame {
+	struct stack_frame	*previous;
+	addr_t				return_address;
+};
+
+
 void
 arch_debug_stack_trace(void)
 {
+	addr_t rbp = x86_read_ebp();
 
+	kprintf("frame                       caller\n");
+
+	for (int32 callIndex = 0;; callIndex++) {
+		if (rbp == 0)
+			break;
+
+		stack_frame* frame = (stack_frame*)rbp;
+		if (frame->return_address == 0)
+			break;
+
+		kprintf("%2d %016lx (+%4ld) %016lx\n", callIndex, rbp,
+			(addr_t)frame->previous - rbp, frame->return_address);
+
+		rbp = (addr_t)frame->previous;
+	}
 }
 
 
@@ -168,6 +190,8 @@ arch_debug_call_with_fault_handler(cpu_ent* cpu, jmp_buf jumpBuffer,
 	void (*function)(void*), void* parameter)
 {
 	// To be implemented in asm, not here.
+
+	function(parameter);
 }