Some build help

.vscode/tasks.json

@@ -0,0 +1,67 @@
+{
+    // See https://go.microsoft.com/fwlink/?LinkId=733558
+    // for the documentation about the tasks.json format
+    "version": "2.0.0",
+    "tasks": [
+        {
+            "label": "make",
+            "type": "shell",
+            "command": "${workspaceRoot}/make",
+            "problemMatcher": [
+                "$gcc"
+            ],
+            "group": {
+                "kind": "build",
+                "isDefault": true
+            }
+        },
+        {
+            "label": "emu",
+            "type": "shell",
+            "command": "${workspaceRoot}/emu",
+            "group": "none",
+            "presentation": {
+                "echo": true,
+                "reveal": "always",
+                "focus": false,
+                "panel": "shared",
+                "showReuseMessage": true,
+                "clear": false
+            },
+            "problemMatcher": []
+        },
+        {
+            "label": "dbg",
+            "type": "shell",
+            "command": "sleep 1;${workspaceRoot}/dbg",
+            "group": "none",
+            "presentation": {
+                "echo": true,
+                "reveal": "always",
+                "focus": true,
+                "panel": "shared",
+                "showReuseMessage": true,
+                "clear": false
+            }
+        },
+        {
+            "label": "test",
+            "group": {
+                "kind": "test",
+                "isDefault": true
+            },
+            "dependsOn": [
+                "emu",
+                "dbg"
+            ],
+            "presentation": {
+                "echo": true,
+                "reveal": "always",
+                "focus": true,
+                "panel": "shared",
+                "showReuseMessage": true,
+                "clear": false
+            }
+        }
+    ]
+}

Makefile

@@ -7,8 +7,13 @@ KERNELMAKE := TARGET=${TARGET} $(MAKE) -C src/kernel
 
 DIST := $(BUILDROOT)/mittos.iso
 SYSROOT := $(BUILDROOT)/sysroot
+SYS_ITEMS := $(SYSROOT)/kernel
 
-$(DIST): $(SYSROOT)/kernel
+all: $(SYSROOT)/kernel
+
+dist: $(DIST)
+
+$(DIST): $(SYS_ITEMS)
 	$(BUILDROOT)/toolchain/setup-grub.sh
 	grub-mkrescue -o $@ $(SYSROOT)
 
@@ -17,7 +22,7 @@ ifeq ($(shell make -sqC src/kernel || echo 1), 1)
 	$(KERNELMAKE) install
 endif
 
-.PHONY: FORCE
+.PHONY: all dist sysroot FORCE
 
 clean:
 	rm -rf $(DIST)

toolchain/gdbinit

@@ -21,10 +21,9 @@ import os
 gdb.execute('file ' + os.environ['BUILDROOT'] + '/sysroot/kernel')
 end
 
+# Inspect registers with `reg RAX` or just `reg`
 python
-
 import re
-
 class Reg(gdb.Command):
 
     def __init__(self):
@@ -52,6 +51,27 @@ class Reg(gdb.Command):
                 print(matches[0])
             else:
                 print(f"Register {arg.upper()} unknown")
-
 Reg()
 end
+
+# Break on any label called panic_breakpoint_X which is defined by the PANIC() macro
+python
+import re
+syms = gdb.execute('maintenance print msymbols', False, True)
+for l in syms.splitlines():
+    matches = re.findall("panic_breakpoint_.*\\b", l)
+    if matches:
+        name = matches[0].split()[0]
+        gdb.execute(f"break {name}", to_string=True)
+
+end
+
+define restore_env
+set $name = $arg0
+python
+regs = ['rax', 'rbx', 'rcx', 'rdx', 'rsi', 'rdi', 'rbp', 'rsp', 'r8', 'r9', 'r10', 'r11', 'r12', 'r13', 'r14', 'r15', 'rip']
+stored = {r: gdb.parse_and_eval('$name->'+r) for r in regs}
+for r in regs:
+    gdb.parse_and_eval(f"${r}={stored[r]}")
+gdb.execute("frame 0")
+end