Merge branch 'threads'

This branch adds initial support for multithreaded targets, as well as
forking and exec syscalls.  All of the bugs from initial testing are
fixed so far.

* threads: (25 commits)
  Don't spin waiting to interrupt zombie process
  Allow termination and exec events to propagate immediately
  Implement support for PTRACE_EVENT_FORK and ui
  Handle PTRACE_EVENT_EXIT to capture a final state snapshot
  Detect out-of-band thread exec state changes to prevent deadlock
  Enable user creation of thread-specific breakpoints
  Add orig_rax to register display
  Tweak SCHEDULER_DELAY for use with installing breakpoints
  Ignore breakpoints during singlestep
  Fix bug with cleaning temporary breakpoints
  Independent thread control refactor
  Multithread version 3
  Add strict_strtoul
  Prevent lingering traps after detach
  Handle PTRACE_EVENT_EXEC
  Workaround SIGSTOP on child process startup
  setpgid is redundant with setsid and causes an error
  Display name of pending signal
  dbg_realcont for testing purposes
  Display installed status of breakpoints
  ...

1 files changed, 43 insertions, 21 deletions

diff --git a/debugger.h b/debugger.h
index 6305e96..cea3bba 100644
--- a/debugger.h
+++ b/debugger.h
@@ -3,18 +3,20 @@
 #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 text;
+    int installed;
+    int hits;
+    int user;
+
     unsigned long stack;
-    unsigned long orig;
+    pid_t tid;
     int enabled;
-    int active;
 };
 
 struct map {
@@ -27,29 +29,49 @@ struct map {
 struct state {
     LINKEDLIST;
     struct user_regs_struct regs;
-    struct user_fpregs_struct fpregs;
     struct list maps;
 };
 
-struct tracee {
-    struct list breaks;
+struct process {
+    LINKEDLIST;
+    pid_t id;
+    int child;
+    struct list breakpoints;
+    struct list threads;
+    char status[128];
+};
+
+struct thread {
+    LINKEDLIST;
+    struct process *proc;
+
     struct list states;
     struct state *state;
+    int clearstates;
+
     pid_t id;
-    int child;
     int stopped;
-    int status;
     int signal;
-    int cont;
-    void *buff;
-    size_t buffsize;
+    int doing;
+    int donext;
+
+    char status[128];
 };
 
-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);
+extern struct breakpoint*add_breakpoint(struct process*proc,unsigned long address);
+extern struct breakpoint*get_breakpoint(struct process*proc,unsigned long address);
+
+extern struct process *dbg_attach(pid_t pid, int child);
+extern void dbg_detach(struct process *proc);
+extern int dbg_free(struct thread *th);
+
+extern void dbg_sync(struct process *proc);
+
+extern int dbg_intr(struct thread *th);
+extern int dbg_cont(struct thread *th);
+extern int dbg_syscall(struct thread *th);
+extern int dbg_stepin(struct thread *th);
+extern int dbg_stepover(struct thread *th);
+extern int dbg_stepback(struct thread *th);
+
+extern void *deref(struct thread *th, unsigned long address, size_t size);