From f309d7a7b78eec10621bc71f9401d5b9257f9f39 Mon Sep 17 00:00:00 2001 From: Michael Brown Date: Sun, 28 Feb 2021 13:45:58 +0000 Subject: [linux] Use host glibc system call wrappers When building as a Linux userspace application, iPXE currently implements its own system calls to the host kernel rather than relying on the host's C library. The output binary is statically linked and has no external dependencies. This matches the general philosophy of other platforms on which iPXE runs, since there are no external libraries available on either BIOS or UEFI bare metal. However, it would be useful for the Linux userspace application to be able to link against host libraries such as libslirp. Modify the build process to perform a two-stage link: first picking out the requested objects in the usual way from blib.a but with relocations left present, then linking again with a helper object to create a standard hosted application. The helper object provides the standard main() entry point and wrappers for the Linux system calls required by the iPXE Linux drivers and interface code. Signed-off-by: Michael Brown --- src/interface/linux/linuxprefix.c | 38 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 38 insertions(+) create mode 100644 src/interface/linux/linuxprefix.c (limited to 'src/interface/linux/linuxprefix.c') diff --git a/src/interface/linux/linuxprefix.c b/src/interface/linux/linuxprefix.c new file mode 100644 index 000000000..f38236202 --- /dev/null +++ b/src/interface/linux/linuxprefix.c @@ -0,0 +1,38 @@ +/* + * Copyright (C) 2021 Michael Brown . + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; either version 2 of the + * License, or any later version. + * + * This program 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 + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA + * 02110-1301, USA. + */ + +#include +#include + +/** + * Linux entry point + * + * @v argc Argument count + * @v argv Argument list + * @ret rc Return status code + */ +int __asmcall _linux_start ( int argc, char **argv ) { + + /* Store command-line arguments */ + linux_argc = argc; + linux_argv = argv; + + /* Run iPXE */ + return main(); +} -- cgit v1.2.3-55-g7522