feat: integrate gdb support over serial port for bare-metal debugging.

[lunaix-os.git] / lunaix-os / debug / bg_lsdbg.c

diff --git a/lunaix-os/debug/bg_lsdbg.c b/lunaix-os/debug/bg_lsdbg.c
new file mode 100644 (file)
index 0000000..0f0496d
--- /dev/null
+++ b/lunaix-os/debug/bg_lsdbg.c
@@ -0,0 +1,77 @@
+#include <klibc/stdio.h>
+#include <lunaix/peripheral/serial.h>
+#include <lunaix/syslog.h>
+#include <sdbg/lsdbg.h>
+
+#define COM SERIAL_COM1
+
+LOG_MODULE("DBG");
+
+static volatile sdbg_state = 0;
+
+void
+sdbg_printf(char* fmt, ...)
+{
+    char buf[256];
+    va_list l;
+
+    va_start(l, fmt);
+
+    size_t len = __ksprintf_internal(buf, fmt, 256, l);
+    serial_tx_buffer(COM, buf, len);
+
+    va_end(l);
+}
+
+void
+lunaix_sdbg_loop(isr_param* param)
+{
+    char c;
+
+    if (sdbg_state == SDBG_STATE_WAIT_BRK) {
+        (param)->eflags &= ~(1 << 8);
+        sdbg_state = SDBG_STATE_INSESSION;
+        sdbg_printf("[%p:%p] Break point reached.\n", param->cs, param->eip);
+    }
+
+    while (1) {
+        c = serial_rx_byte(SERIAL_COM1);
+        if (c == SDBG_CLNT_QUIT) {
+            sdbg_state = SDBG_STATE_START;
+            break;
+        }
+
+        switch (c) {
+            case SDBG_CLNT_HI:
+                if (sdbg_state == SDBG_STATE_START) {
+                    sdbg_printf(
+                      "[%p:%p] Session started.\n", param->cs, param->eip);
+                    sdbg_state = SDBG_STATE_INSESSION;
+                } else {
+                    sdbg_printf(
+                      "[%p:%p] Session resumed.\n", param->cs, param->eip);
+                }
+                break;
+            case SDBG_CLNT_RREG:
+
+                serial_tx_buffer(SERIAL_COM1, (char*)param, sizeof(isr_param));
+                break;
+            case SDBG_CLNT_STEP:
+                ((isr_param*)param)->eflags |= (1 << 8); // set TF flags
+                sdbg_state = SDBG_STATE_WAIT_BRK;
+                return;
+            case SDBG_CLNT_BRKP:
+                // the break point address
+                // serial_rx_buffer(SERIAL_COM1, buffer, sizeof(uintptr_t));
+
+                // asm("movl %0, %%dr0" ::"r"(*((uintptr_t*)buffer)));
+
+                sdbg_state = SDBG_STATE_WAIT_BRK;
+                return;
+            case SDBG_CLNT_CONT:
+                return;
+            default:
+                break;
+        }
+    }
+}
\ No newline at end of file