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https://github.com/freebsd/freebsd-src
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a03411e847
Move the startup code from kboot/kboot to kboot/libkboot and add the necessary infrastructure for it to build. move start_arch.h, a private header for libkboot, over as well. Sponsored by: Netflix
75 lines
1.9 KiB
C
75 lines
1.9 KiB
C
/*
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* Copyright (c) 2022, Netflix, Inc.
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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/*
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* MI part of the C startup code. We take a long * pointer (we assume long is
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* the same size as a pointer, as the Linux world is wont to do). We get a
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* pointer to the stack with the main args on it. We don't bother decoding the
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* aux vector, but may need to do so in the future.
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*
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* The long *p points to:
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*
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* +--------------------+
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* | argc | Small address
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* +--------------------+
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* | argv[0] | argv
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* +--------------------+
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* | argv[1] |
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* +--------------------+
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* ...
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* +--------------------+
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* | NULL | &argv[argc]
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* +--------------------+
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* | envp[0] | envp
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* +--------------------+
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* | envp[1] |
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* +--------------------+
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* ...
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* +--------------------+
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* | NULL |
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* +--------------------+
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* | aux type | AT_xxxx
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* +--------------------+
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* | aux value |
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* +--------------------+
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* | aux type | AT_xxxx
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* +--------------------+
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* | aux value |
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* +--------------------+
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* | aux type | AT_xxxx
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* +--------------------+
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* | aux value |
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* +--------------------+
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*...
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* +--------------------+
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* | NULL |
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* +--------------------+
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*
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* The AUX vector contains additional information for the process to know from
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* the kernel (not parsed currently). AT_xxxx constants are small (< 50).
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*/
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extern void _start_c(long *);
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extern int main(int, const char **, char **);
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#include "start_arch.h"
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void
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_start_c(long *p)
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{
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int argc;
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const char **argv;
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char **envp;
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argc = p[0];
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argv = (const char **)(p + 1);
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envp = (char **)argv + argc + 1;
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/* Note: we don't ensure that fd 0, 1, and 2 are sane at this level */
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/* Also note: we expect main to exit, not return off the end */
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main(argc, argv, envp);
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}
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