arch: i386: syscall.c: add functions that dump data

Add functions to the syscall handlers that dump registers and stack in
case of catastrophic failure.

Signed-off-by: Danny Holman <dholman@gymli.org>

2 files changed, 9 insertions, 1 deletions

diff --git a/arch/i386/include/kernel/syscall.h b/arch/i386/include/kernel/syscall.h
index fdd6520..788e5da 100644
--- a/arch/i386/include/kernel/syscall.h
+++ b/arch/i386/include/kernel/syscall.h
@@ -2,6 +2,7 @@
 #define I386_SYSCALL_H
 
 #include <kernel/isr.h>
+#include <stddef.h>
 
 // Unix standard calls
 #define SYS_FORK        1
@@ -27,5 +28,6 @@
 
 int handle_syscall(struct isr_frame *frame);
 void dump_reg(struct isr_frame *frame);
+void dump_stack(uintptr_t esp, size_t len);
 
 #endif
diff --git a/arch/i386/kernel/syscall.c b/arch/i386/kernel/syscall.c
index 593bb64..7bdb24b 100644
--- a/arch/i386/kernel/syscall.c
+++ b/arch/i386/kernel/syscall.c
@@ -9,6 +9,7 @@ int handle_syscall(struct isr_frame *frame) {
                         break;
                 default:
                         kprintf("Error: Invalid system call number: %d\n", frame->eax);
+                        halt_catch_fire(frame);
         }
         return 0;
 }
@@ -22,5 +23,10 @@ void dump_reg(struct isr_frame *frame) {
         kprintf("\tESI = %x\n", frame->esi);
         kprintf("\tEDI = %x\n", frame->edi);
         kprintf("\tEIP = %x\n", frame->eip);
-        kprintf("Current code selector: %d\n", frame->cs);
+        kprintf("Current code selector: %x\n", frame->cs);
+}
+
+void dump_stack(uint32_t esp, size_t len) {
+        for (uint32_t i = 0; i < len; i++)
+                kprintf("%x:\t%x\n", esp+i, *(uint32_t*)(esp+i));
 }