46 lines
1.3 KiB
C
46 lines
1.3 KiB
C
/* libc/sys/linux/crt0.c - Run-time initialization */
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/* FIXME: This should be rewritten in assembler and
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placed in a subdirectory specific to a platform.
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There should also be calls to run constructors. */
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/* Written 2000 by Werner Almesberger */
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#include <stdlib.h>
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#include <time.h>
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#include <string.h>
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extern char **environ;
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extern int main(int argc,char **argv,char **envp);
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extern char _end;
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extern char __bss_start;
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void _start(int args)
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{
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/*
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* The argument block begins above the current stack frame, because we
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* have no return address. The calculation assumes that sizeof(int) ==
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* sizeof(void *). This is okay for i386 user space, but may be invalid in
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* other cases.
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*/
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int *params = &args-1;
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int argc = *params;
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char **argv = (char **) (params+1);
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environ = argv+argc+1;
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/* Note: do not clear the .bss section. When running with shared
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* libraries, certain data items such __mb_cur_max or environ
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* may get placed in the .bss, even though they are initialized
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* to non-zero values. Clearing the .bss will end up zeroing
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* out their initial values. The .bss is already initialized
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* by this time by Linux. */
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tzset(); /* initialize timezone info */
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exit(main(argc,argv,environ));
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}
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