---
clone_x86_32.c | 65 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 65 insertions(+), 0 deletions(-)
diff --git a/clone_x86_32.c b/clone_x86_32.c
index 8ab3c3e..61b593c 100644
--- a/clone_x86_32.c
+++ b/clone_x86_32.c
@@ -81,3 +81,68 @@ int clone_with_pids(int (*fn)(void *), void *child_stack,
int flags,
}
#endif
+
+#include "eclone.h"
+
+#ifndef __NR_eclone
+#define __NR_eclone 337
+#endif
+
+int eclone(int (*fn)(void *), void *fn_arg, int clone_flags_low,
+ struct clone_args *clone_args, pid_t *pids)
+{
+ struct clone_args my_args;
+ long retval;
+ void **newstack;
+
+ if (clone_args->child_stack) {
+ /*
+ * Set up the stack for child:
+ * - fn_arg will be the argument for the child function
+ * - the fn pointer will be loaded into ebx after the clone
+ */
+ newstack = (void **)(unsigned long)(clone_args->child_stack +
+ clone_args->child_stack_size);
+ *--newstack = fn_arg;
+ *--newstack = fn;
+ } else
+ newstack = (void **)0;
+
+ my_args = *clone_args;
+ my_args.child_stack = (unsigned long)newstack;
+ my_args.child_stack_size = 0;
+
+ __asm__ __volatile__(
+ "movl %0, %%ebx\n\t" /* flags -> 1st (ebx) */
+ "movl %1, %%ecx\n\t" /* clone_args -> 2nd (ecx) */
+ "movl %2, %%edx\n\t" /* args_size -> 3rd (edx) */
+ "movl %3, %%edi\n\t" /* pids -> 4th (edi) */
+ "pushl %%ebp\n\t" /* save value of ebp */
+ :
+ :"b" (clone_flags_low),
+ "c" (&my_args),
+ "d" (sizeof(my_args)),
+ "D" (pids)
+ );
+
+ __asm__ __volatile__(
+ "int $0x80\n\t" /* Linux/i386 system call */
+ "testl %0,%0\n\t" /* check return value */
+ "jne 1f\n\t" /* jump if parent */
+ "popl %%ebx\n\t" /* get subthread function */
+ "call *%%ebx\n\t" /* start subthread function */
+ "movl %2,%0\n\t"
+ "int $0x80\n" /* exit system call: exit subthread */
+ "1:\n\t"
+ "popl %%ebp\t" /* restore parent's ebp */
+ :"=a" (retval)
+ :"0" (__NR_eclone), "i" (__NR_exit)
+ :"ebx", "ecx"
+ );
+
+ if (retval < 0) {
+ errno = -retval;
+ retval = -1;
+ }
+ return retval;
+}
--
1.6.2.5
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