Partial implement VFS pager (enough for ISO9660!)

Also add some debugging facilities (especially stack trace).

4 files changed, 17 insertions, 4 deletions

diff --git a/src/kernel/core/idt.c b/src/kernel/core/idt.c
index 6bfe8b5..eef3ca6 100644
--- a/src/kernel/core/idt.c
+++ b/src/kernel/core/idt.c
@@ -275,7 +275,19 @@ void dbg_dump_registers(registers_t *regs) {
 	dbg_printf("| EAX: 0x%p   EBX: 0x%p   ECX: 0x%p   EDX: 0x%p\n", regs->eax, regs->ebx, regs->ecx, regs->edx);
 	dbg_printf("| EDI: 0x%p   ESI: 0x%p   ESP: 0x%p   EBP: 0x%p\n", regs->edi, regs->esi, regs->esp, regs->ebp);
 	dbg_printf("| EIP: 0x%p   CS : 0x%p   DS : 0x%p   SS : 0x%p\n", regs->eip, regs->cs, regs->ds, regs->ss);
-	dbg_printf("\\ EFl: 0x%p   I# : 0x%p   Err: 0x%p\n", regs->eflags, regs->int_no, regs->err_code);
+	dbg_printf("| EFl: 0x%p   I# : 0x%p   Err: 0x%p\n", regs->eflags, regs->int_no, regs->err_code);
+	dbg_printf("- Stack trace:\n");
+
+	uint32_t ebp = regs->ebp, eip = regs->eip;
+	int i = 0;
+	while (ebp >= K_HIGHHALF_ADDR && eip >= K_HIGHHALF_ADDR && i++ < 10) {
+		dbg_printf("| 0x%p	EIP: 0x%p\n", ebp, eip);
+		uint32_t *d = (uint32_t*)ebp;
+		ebp = d[0];
+		eip = d[1];
+	}
+
+	dbg_printf("\\\n");
 }
 
 /* vim: set ts=4 sw=4 tw=0 noet :*/
diff --git a/src/kernel/core/kmalloc.c b/src/kernel/core/kmalloc.c
index a8b115b..85e6173 100644
--- a/src/kernel/core/kmalloc.c
+++ b/src/kernel/core/kmalloc.c
@@ -9,7 +9,7 @@
 #include <freemem.h>
 
 static void* page_alloc_fun_for_kmalloc(size_t bytes) {
-	void* addr = region_alloc(bytes, "Core kernel heap", pf_handler_unexpected);
+	void* addr = region_alloc(bytes, "Core kernel heap", 0);
 	if (addr == 0) return 0;
 
 	// Map physical memory
diff --git a/src/kernel/core/paging.c b/src/kernel/core/paging.c
index 38e8407..f2289bd 100644
--- a/src/kernel/core/paging.c
+++ b/src/kernel/core/paging.c
@@ -66,6 +66,7 @@ void page_fault_handler(registers_t *regs) {
 		if ((size_t)vaddr < PAGE_SIZE) {
 			dbg_printf("Null pointer dereference in kernel code (0x%p)\n", vaddr);
 			dbg_dump_registers(regs);
+			dbg_print_region_info();
 			PANIC("Null pointer dereference in kernel code.");
 		} else if ((size_t)vaddr < K_HIGHHALF_ADDR) {
 			if (pd->user_pfh == 0) {
@@ -108,7 +109,7 @@ void page_fault_handler(registers_t *regs) {
 				PANIC("Unhandled kernel space page fault");
 			}
 			if (i->pf == 0) {
-				dbg_printf("Kernel pagefault in region with no handler at 0x%p\n", vaddr);
+				dbg_printf("Kernel pagefault in region with no handler at 0x%p (%s region)\n", vaddr, i->type);
 				dbg_dump_registers(regs);
 				dbg_print_region_info();
 				PANIC("Unhandled kernel space page fault");
diff --git a/src/kernel/core/thread.c b/src/kernel/core/thread.c
index 58c92d3..74e5a30 100644
--- a/src/kernel/core/thread.c
+++ b/src/kernel/core/thread.c
@@ -157,7 +157,7 @@ thread_t *new_thread(entry_t entry, void* data) {
 	thread_t *t = (thread_t*)malloc(sizeof(thread_t));
 	if (t == 0) return 0;
 
-	void* stack = region_alloc(KPROC_STACK_SIZE + PAGE_SIZE, "Stack", pf_handler_stackoverflow);
+	void* stack = region_alloc(KPROC_STACK_SIZE + PAGE_SIZE, "Stack", 0);
 	if (stack == 0) {
 		free(t);
 		return 0;