some more x86_64 source

diff --git a/libc/sysdeps/linux/x86_64/clone.S b/libc/sysdeps/linux/x86_64/clone.S
new file mode 100644 (file)
index 0000000..9d244d0
--- /dev/null
+++ b/libc/sysdeps/linux/x86_64/clone.S
@@ -0,0 +1,116 @@
+/* Copyright (C) 2001, 2002, 2003, 2004 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+/* clone() is even more special than fork() as it mucks with stacks
+   and invokes a function in the right context after its all over.  */
+
+#define _ERRNO_H       1
+#include <bits/errno.h>
+
+#define CLONE_VM       0x00000100
+#define CLONE_THREAD   0x00010000
+
+/* The userland implementation is:
+   int clone (int (*fn)(void *arg), void *child_stack, int flags, void *arg),
+   the kernel entry is:
+   int clone (long flags, void *child_stack).
+
+   The parameters are passed in register and on the stack from userland:
+   rdi: fn
+   rsi: child_stack
+   rdx:        flags
+   rcx: arg
+   r8d:        TID field in parent
+   r9d: thread pointer
+%esp+8:        TID field in child
+
+   The kernel expects:
+   rax: system call number
+   rdi: flags
+   rsi: child_stack
+   rdx: TID field in parent
+   r10: TID field in child
+   r8: thread pointer  */
+
+
+        .text
+.globl __clone;
+.type  __clone,@function
+.align 4;
+__clone:
+       /* Sanity check arguments.  */
+       movq    $-EINVAL,%rax
+       testq   %rdi,%rdi               /* no NULL function pointers */
+       jz      __syscall_error
+       testq   %rsi,%rsi               /* no NULL stack pointers */
+       jz      __syscall_error
+
+       /* Insert the argument onto the new stack.  */
+       subq    $16,%rsi
+       movq    %rcx,8(%rsi)
+
+       /* Save the function pointer.  It will be popped off in the
+          child in the ebx frobbing below.  */
+       movq    %rdi,0(%rsi)
+
+       /* Do the system call.  */
+       movq    %rdx, %rdi
+       movq    %r8, %rdx
+       movq    %r9, %r8
+       movq    8(%rsp), %r10
+       movq    $__NR_clone,%rax
+
+       syscall
+
+       testq   %rax,%rax
+       jl      __syscall_error
+       jz      L(thread_start)
+
+L(pseudo_end):
+       ret
+
+L(thread_start):
+       /* Clear the frame pointer.  The ABI suggests this be done, to mark
+          the outermost frame obviously.  */
+       xorq    %rbp, %rbp
+
+#ifdef RESET_PID
+       testq   $CLONE_THREAD, %rdi
+       jne     1f
+       testq   $CLONE_VM, %rdi
+       movl    $-1, %eax
+       jne     2f
+       movq    __NR_getpid, %rax
+       syscall
+2:     movl    %eax, %fs:PID
+       movl    %eax, %fs:TID
+1:
+#endif
+
+       /* Set up arguments for the function call.  */
+       popq    %rax            /* Function to call.  */
+       popq    %rdi            /* Argument.  */
+       call    *%rax
+       /* Call exit with return value from function call. */
+       movq    %rax, %rdi
+       call    HIDDEN_JUMPTARGET (_exit)
+
+       cfi_startproc;
+PSEUDO_END (BP_SYM (__clone))
+
+weak_alias (BP_SYM (__clone), BP_SYM (clone))

diff --git a/libc/sysdeps/linux/x86_64/vfork.S b/libc/sysdeps/linux/x86_64/vfork.S
new file mode 100644 (file)
index 0000000..072a3a0
--- /dev/null
+++ b/libc/sysdeps/linux/x86_64/vfork.S
@@ -0,0 +1,53 @@
+/* Copyright (C) 2001, 2002, 2004 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+#define _ERRNO_H       1
+#include <bits/errno.h>
+
+/* Clone the calling process, but without copying the whole address space.
+   The calling process is suspended until the new process exits or is
+   replaced by a call to `execve'.  Return -1 for errors, 0 to the new process,
+   and the process ID of the new process to the old process.  */
+
+.globl __vfork;
+.type  __vfork,@function;
+.align 16;
+__vfork:
+
+       /* Pop the return PC value into RDI.  We need a register that
+          is preserved by the syscall and that we're allowed to destroy. */
+       popq    %rdi
+
+       /* Stuff the syscall number in RAX and enter into the kernel.  */
+       movl    $__NR_vfork, %eax
+       syscall
+
+       /* Push back the return PC.  */
+       pushq   %rdi
+
+       cmpl    $-4095, %eax
+       jae __syscall_error             /* Branch forward if it failed.  */
+
+       /* Normal return.  */
+       ret
+
+__syscall_error:
+       /* TODO: implement this ! :D */
+
+.size   __vfork,.Lsize-__vfork
+.weak vfork ; vfork = __vfork