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authorAnton Arapov <anton@redhat.com>2012-04-16 10:05:28 +0200
committerAnton Arapov <anton@redhat.com>2012-04-16 10:05:28 +0200
commitb4b6116a13633898cf868f2f103c96a90c4c20f8 (patch)
tree93d1b7e2cfcdf473d8d4ff3ad141fa864f8491f6 /arch/um/kernel/exec.c
parentedd4be777c953e5faafc80d091d3084b4343f5d3 (diff)
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fedora kernel: d9aad82f3319f3cfd1aebc01234254ef0c37ad84v3.3.2-1
Signed-off-by: Anton Arapov <anton@redhat.com>
Diffstat (limited to 'arch/um/kernel/exec.c')
-rw-r--r--arch/um/kernel/exec.c88
1 files changed, 88 insertions, 0 deletions
diff --git a/arch/um/kernel/exec.c b/arch/um/kernel/exec.c
new file mode 100644
index 00000000000..6cade936636
--- /dev/null
+++ b/arch/um/kernel/exec.c
@@ -0,0 +1,88 @@
+/*
+ * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL
+ */
+
+#include <linux/stddef.h>
+#include <linux/module.h>
+#include <linux/fs.h>
+#include <linux/ptrace.h>
+#include <linux/sched.h>
+#include <linux/slab.h>
+#include <asm/current.h>
+#include <asm/processor.h>
+#include <asm/uaccess.h>
+#include "as-layout.h"
+#include "mem_user.h"
+#include "skas.h"
+#include "os.h"
+#include "internal.h"
+
+void flush_thread(void)
+{
+ void *data = NULL;
+ int ret;
+
+ arch_flush_thread(&current->thread.arch);
+
+ ret = unmap(&current->mm->context.id, 0, STUB_START, 0, &data);
+ ret = ret || unmap(&current->mm->context.id, STUB_END,
+ host_task_size - STUB_END, 1, &data);
+ if (ret) {
+ printk(KERN_ERR "flush_thread - clearing address space failed, "
+ "err = %d\n", ret);
+ force_sig(SIGKILL, current);
+ }
+
+ __switch_mm(&current->mm->context.id);
+}
+
+void start_thread(struct pt_regs *regs, unsigned long eip, unsigned long esp)
+{
+ PT_REGS_IP(regs) = eip;
+ PT_REGS_SP(regs) = esp;
+}
+EXPORT_SYMBOL(start_thread);
+
+static long execve1(const char *file,
+ const char __user *const __user *argv,
+ const char __user *const __user *env)
+{
+ long error;
+
+ error = do_execve(file, argv, env, &current->thread.regs);
+ if (error == 0) {
+ task_lock(current);
+ current->ptrace &= ~PT_DTRACE;
+#ifdef SUBARCH_EXECVE1
+ SUBARCH_EXECVE1(&current->thread.regs.regs);
+#endif
+ task_unlock(current);
+ }
+ return error;
+}
+
+long um_execve(const char *file, const char __user *const __user *argv, const char __user *const __user *env)
+{
+ long err;
+
+ err = execve1(file, argv, env);
+ if (!err)
+ UML_LONGJMP(current->thread.exec_buf, 1);
+ return err;
+}
+
+long sys_execve(const char __user *file, const char __user *const __user *argv,
+ const char __user *const __user *env)
+{
+ long error;
+ char *filename;
+
+ filename = getname(file);
+ error = PTR_ERR(filename);
+ if (IS_ERR(filename)) goto out;
+ error = execve1(filename, argv, env);
+ putname(filename);
+ out:
+ return error;
+}