Merge tag 'bsd-user-for-9.1-pull-request' of gitlab.com:bsdimp/qemu into staging

bsd-user: Misc changes for 9.1 (I hope)

V2: Add missing bsd-user/aarch64/target.h

This patch series includes two main sets of patches. To make it simple to
review, I've included the changes from my student which the later changes depend
on. I've included a change from Jessica and Doug as well. I've reviewed them,
but more eyes never hurt.

I've also included a number of 'touch up' patches needed either to get the
aarch64 building, or to implmement suggestions from prior review cycles. The
main one is what's charitably described as a kludge: force aarch64 to use 4k
pages. The qemu-project (and blitz branch) hasn't had the necessary changes to
bsd-user needed to support variable page size.

Sorry this is so late... Live has conspired to delay me.

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# gpg:                 aka "Warner Losh <imp@bsdimp.com>" [unknown]
# gpg:                 aka "Warner Losh <imp@freebsd.org>" [unknown]
# gpg:                 aka "Warner Losh <imp@village.org>" [unknown]
# gpg:                 aka "Warner Losh <wlosh@bsdimp.com>" [unknown]
# gpg: WARNING: This key is not certified with a trusted signature!
# gpg:          There is no indication that the signature belongs to the owner.
# Primary key fingerprint: 2035 F894 B00A A3CF 7CCD  E1B7 6C1C D128 7DB0 1100

* tag 'bsd-user-for-9.1-pull-request' of gitlab.com:bsdimp/qemu:
  bsd-user: Add target.h for aarch64.
  bsd-user: Add aarch64 build to tree
  bsd-user: Make compile for non-linux user-mode stuff
  bsd-user: Define TARGET_SIGSTACK_ALIGN and use it to round stack
  bsd-user: Sync fork_start/fork_end with linux-user
  bsd-user: Hard wire aarch64 to be 4k pages only
  bsd-user: Simplify the implementation of execve
  bsd-user:Add AArch64 improvements and signal handling functions
  bsd-user:Add set_mcontext function for ARM AArch64
  bsd-user:Add setup_sigframe_arch function for ARM AArch64
  bsd-user:Add get_mcontext function for ARM AArch64
  bsd-user:Add ARM AArch64 signal handling support
  bsd-user:Add ARM AArch64 support and capabilities
  bsd-user:Add AArch64 register handling and related functions
  bsd-user:Add CPU initialization and management functions

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

1 files changed, 14 insertions, 30 deletions

diff --git a/bsd-user/main.c b/bsd-user/main.c
index dcad266c2c..cc980e6f40 100644
--- a/bsd-user/main.c
+++ b/bsd-user/main.c
@@ -35,6 +35,7 @@
 #include "qemu/path.h"
 #include "qemu/help_option.h"
 #include "qemu/module.h"
+#include "qemu/plugin.h"
 #include "exec/exec-all.h"
 #include "user/guest-base.h"
 #include "tcg/startup.h"
@@ -90,7 +91,6 @@ unsigned long reserved_va;
 
 const char *interp_prefix = CONFIG_QEMU_INTERP_PREFIX;
 const char *qemu_uname_release;
-char qemu_proc_pathname[PATH_MAX];  /* full path to exeutable */
 
 unsigned long target_maxtsiz = TARGET_MAXTSIZ;   /* max text size */
 unsigned long target_dfldsiz = TARGET_DFLDSIZ;   /* initial data size limit */
@@ -104,8 +104,9 @@ unsigned long target_sgrowsiz = TARGET_SGROWSIZ; /* amount to grow stack */
 void fork_start(void)
 {
     start_exclusive();
-    cpu_list_lock();
     mmap_fork_start();
+    cpu_list_lock();
+    qemu_plugin_user_prefork_lock();
     gdbserver_fork_start();
 }
 
@@ -113,31 +114,31 @@ void fork_end(pid_t pid)
 {
     bool child = pid == 0;
 
+    qemu_plugin_user_postfork(child);
+    mmap_fork_end(child);
     if (child) {
         CPUState *cpu, *next_cpu;
         /*
-         * Child processes created by fork() only have a single thread.  Discard
-         * information about the parent threads.
+         * Child processes created by fork() only have a single thread.
+         * Discard information about the parent threads.
          */
         CPU_FOREACH_SAFE(cpu, next_cpu) {
             if (cpu != thread_cpu) {
                 QTAILQ_REMOVE_RCU(&cpus_queue, cpu, node);
             }
         }
-        mmap_fork_end(child);
-        /*
-         * qemu_init_cpu_list() takes care of reinitializing the exclusive
-         * state, so we don't need to end_exclusive() here.
-         */
         qemu_init_cpu_list();
         get_task_state(thread_cpu)->ts_tid = qemu_get_thread_id();
-        gdbserver_fork_end(thread_cpu, pid);
     } else {
-        mmap_fork_end(child);
         cpu_list_unlock();
-        gdbserver_fork_end(thread_cpu, pid);
-        end_exclusive();
     }
+    gdbserver_fork_end(thread_cpu, pid);
+    /*
+     * qemu_init_cpu_list() reinitialized the child exclusive state, but we
+     * also need to keep current_cpu consistent, so call end_exclusive() for
+     * both child and parent.
+     */
+    end_exclusive();
 }
 
 void cpu_loop(CPUArchState *env)
@@ -247,22 +248,6 @@ adjust_ssize(void)
     setrlimit(RLIMIT_STACK, &rl);
 }
 
-static void save_proc_pathname(char *argv0)
-{
-    int mib[4];
-    size_t len;
-
-    mib[0] = CTL_KERN;
-    mib[1] = KERN_PROC;
-    mib[2] = KERN_PROC_PATHNAME;
-    mib[3] = -1;
-
-    len = sizeof(qemu_proc_pathname);
-    if (sysctl(mib, 4, qemu_proc_pathname, &len, NULL, 0)) {
-        perror("sysctl");
-    }
-}
-
 int main(int argc, char **argv)
 {
     const char *filename;
@@ -292,7 +277,6 @@ int main(int argc, char **argv)
         usage();
     }
 
-    save_proc_pathname(argv[0]);
 
     error_init(argv[0]);
     module_call_init(MODULE_INIT_TRACE);