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6d5331054e
There is a special interface built in ARC simulators (such as
nSIM) called MetaWare hostlink IO which can be used to implement
system calls. This commit adds support for this interface to the
ARC port of libgloss.
Here is an example of using this interface:
$ arc-elf32-gcc -mcpu=hs -specs=hl.specs main.c -o main
$ nsimdrv -tcf $NSIM_HOME/etc/tcf/templates/hs48_full.tcf main
Hello, World!
Signed-off-by: Vladimir Isaev <vvisaev@gmail.com>
74 lines
1.9 KiB
C
74 lines
1.9 KiB
C
/*
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* arc-main-helper.c -- provide custom __setup_argv_and_call_main();
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* This function uses _argc(), _argvlen(), _argv() and _setup_low_level().
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* Description for these functions can be found below in this file.
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*
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* Copyright (c) 2024 Synopsys Inc.
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*
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* The authors hereby grant permission to use, copy, modify, distribute,
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* and license this software and its documentation for any purpose, provided
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* that existing copyright notices are retained in all copies and that this
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* notice is included verbatim in any distributions. No written agreement,
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* license, or royalty fee is required for any of the authorized uses.
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* Modifications to this software may be copyrighted by their authors
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* and need not follow the licensing terms described here, provided that
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* the new terms are clearly indicated on the first page of each file where
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* they apply.
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*
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*/
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#include <stddef.h>
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#include <stdint.h>
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#include <alloca.h>
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/* Return number of arguments passed to host executable. */
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extern int _argc (void);
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/*
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* Return buffer length to be used for a given argument number.
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* Buffer length includes '\0' character.
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*/
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extern uint32_t _argvlen (int a);
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/*
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* Copy argument into buffer arg.
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* arg must be no less than argvlen(a) length.
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*/
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extern int _argv (int a, char *arg);
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/* Custom setup. Can be used to setup some port-specific stuff. */
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extern int _setup_low_level (void);
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/* main function to call. */
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extern int main (int argc, char **argv);
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/* Copy arguments from host to local stack and call main. */
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int
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__setup_argv_and_call_main (void)
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{
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int i;
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int argc;
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char **argv = NULL;
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argc = _argc ();
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if (argc > 0)
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argv = alloca ((argc + 1) * sizeof (char *));
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for (i = 0; i < argc; i++)
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{
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uint32_t arg_len;
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arg_len = _argvlen (i);
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if (arg_len == 0)
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break;
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argv[i] = alloca (arg_len);
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if (_argv (i, argv[i]) < 0)
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break;
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}
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if (argv)
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argv[i] = NULL;
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_setup_low_level ();
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return main (i, argv);
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}
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