LXR uboot/arch/x86/lib/cmd

   1// SPDX-License-Identifier: GPL-2.0+
   2/*
   3 * (C) Copyright 2008-2011
   4 * Graeme Russ, <graeme.russ@gmail.com>
   5 *
   6 * (C) Copyright 2002
   7 * Daniel Engström, Omicron Ceti AB, <daniel@omicron.se>
   8 *
   9 * (C) Copyright 2002
  10 * Wolfgang Denk, DENX Software Engineering, <wd@denx.de>
  11 *
  12 * (C) Copyright 2002
  13 * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
  14 * Marius Groeger <mgroeger@sysgo.de>
  15 */
  16
  17#include <common.h>
  18#include <command.h>
  19#include <malloc.h>
  20#include <asm/global_data.h>
  21#include <asm/u-boot-x86.h>
  22
  23DECLARE_GLOBAL_DATA_PTR;
  24
  25unsigned long do_go_exec(ulong (*entry)(int, char * const []),
  26                         int argc, char *const argv[])
  27{
  28        unsigned long ret = 0;
  29        char **argv_tmp;
  30
  31        /*
  32         * x86 does not use a dedicated register to pass the pointer to
  33         * the global_data, so it is instead passed as argv[-1]. By using
  34         * argv[-1], the called 'Application' can use the contents of
  35         * argv natively. However, to safely use argv[-1] a new copy of
  36         * argv is needed with the extra element
  37         */
  38        argv_tmp = malloc(sizeof(char *) * (argc + 1));
  39
  40        if (argv_tmp) {
  41                argv_tmp[0] = (char *)gd;
  42
  43                memcpy(&argv_tmp[1], argv, (size_t)(sizeof(char *) * argc));
  44
  45                ret = (entry) (argc, &argv_tmp[1]);
  46                free(argv_tmp);
  47        }
  48
  49        return ret;
  50}
  51