linux-user: implemented ELF coredump support for ARM target

When target process is killed with signal (such signal that
should dump core) a coredump file is created.  This file is
similar than coredump generated by Linux (there are few exceptions
though).

Riku Voipio: added support for rlimit

Signed-off-by: Mika Westerberg <mika.westerberg@iki.fi>
Signed-off-by: Riku Voipio <riku.voipio@iki.fi>

1 files changed, 35 insertions, 7 deletions

diff --git a/linux-user/main.c b/linux-user/main.c
index 4832d3f860..7eabd0c22f 100644
--- a/linux-user/main.c
+++ b/linux-user/main.c
@@ -25,6 +25,7 @@
 #include <errno.h>
 #include <unistd.h>
 #include <sys/mman.h>
+#include <sys/syscall.h>
 
 #include "qemu.h"
 #include "qemu-common.h"
@@ -2319,6 +2320,27 @@ static void usage(void)
 
 THREAD CPUState *thread_env;
 
+void task_settid(TaskState *ts)
+{
+    if (ts->ts_tid == 0) {
+#ifdef USE_NPTL
+        ts->ts_tid = (pid_t)syscall(SYS_gettid);
+#else
+        /* when no threads are used, tid becomes pid */
+        ts->ts_tid = getpid();
+#endif
+    }
+}
+
+void stop_all_tasks(void)
+{
+    /*
+     * We trust that when using NPTL, start_exclusive()
+     * handles thread stopping correctly.
+     */
+    start_exclusive();
+}
+
 /* Assumes contents are already zeroed.  */
 void init_task_state(TaskState *ts)
 {
@@ -2338,6 +2360,7 @@ int main(int argc, char **argv, char **envp)
     const char *cpu_model;
     struct target_pt_regs regs1, *regs = &regs1;
     struct image_info info1, *info = &info1;
+    struct linux_binprm bprm;
     TaskState ts1, *ts = &ts1;
     CPUState *env;
     int optind;
@@ -2467,6 +2490,8 @@ int main(int argc, char **argv, char **envp)
     /* Zero out image_info */
     memset(info, 0, sizeof(struct image_info));
 
+    memset(&bprm, 0, sizeof (bprm));
+
     /* Scan interp_prefix dir for replacement files. */
     init_paths(interp_prefix);
 
@@ -2543,7 +2568,16 @@ int main(int argc, char **argv, char **envp)
     }
     target_argv[target_argc] = NULL;
 
-    if (loader_exec(filename, target_argv, target_environ, regs, info) != 0) {
+    memset(ts, 0, sizeof(TaskState));
+    init_task_state(ts);
+    /* build Task State */
+    ts->info = info;
+    ts->bprm = &bprm;
+    env->opaque = ts;
+    task_settid(ts);
+
+    if (loader_exec(filename, target_argv, target_environ, regs,
+        info, &bprm) != 0) {
         printf("Error loading %s\n", filename);
         _exit(1);
     }
@@ -2579,12 +2613,6 @@ int main(int argc, char **argv, char **envp)
     syscall_init();
     signal_init();
 
-    /* build Task State */
-    memset(ts, 0, sizeof(TaskState));
-    init_task_state(ts);
-    ts->info = info;
-    env->opaque = ts;
-
 #if defined(TARGET_I386)
     cpu_x86_set_cpl(env, 3);