Initial debugger core and test UI

This is vaguely competent at tracing single-threaded programs.  Vi-like
keybinds defined in misplays.c.

Signed-off-by: Malfurious <m@lfurio.us>

1 files changed, 55 insertions, 0 deletions

diff --git a/debugger.h b/debugger.h
new file mode 100644
index 0000000..6305e96
--- /dev/null
+++ b/debugger.h
@@ -0,0 +1,55 @@
+#pragma once
+
+#include <sys/user.h>
+#include <unistd.h>
+
+#include "console.h"
+#include "list.h"
+
+#define BREAKPOINT_INSN 0xcc
+
+struct breakpoint {
+    LINKEDLIST;
+    unsigned long address;
+    unsigned long stack;
+    unsigned long orig;
+    int enabled;
+    int active;
+};
+
+struct map {
+    LINKEDLIST;
+    unsigned long start;
+    unsigned long end;
+    void *data;
+};
+
+struct state {
+    LINKEDLIST;
+    struct user_regs_struct regs;
+    struct user_fpregs_struct fpregs;
+    struct list maps;
+};
+
+struct tracee {
+    struct list breaks;
+    struct list states;
+    struct state *state;
+    pid_t id;
+    int child;
+    int stopped;
+    int status;
+    int signal;
+    int cont;
+    void *buff;
+    size_t buffsize;
+};
+
+extern int dbg_process(struct tracee *dbg, pid_t pid);
+extern int dbg_new_process(struct tracee *dbg, char **argv, struct console *cons);
+extern int dbg_wait(struct tracee *dbg);
+extern int dbg_stepin(struct tracee *dbg);
+extern int dbg_stepover(struct tracee *dbg);
+//extern int dbg_stepout(struct tracee *dbg);
+extern int dbg_cont(struct tracee *dbg, int mode);
+extern void *deref(struct tracee *dbg, unsigned long addr, size_t size);