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https://github.com/systemd/systemd.git
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57 lines
1.3 KiB
C
57 lines
1.3 KiB
C
/*
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* __shared_init.c
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*
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* This function takes the raw data block set up by the ELF loader
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* in the kernel and parses it. It is invoked by crt0.S which makes
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* any necessary adjustments and passes calls this function using
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* the standard C calling convention.
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*
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* The arguments are:
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* uintptr_t *elfdata -- The ELF loader data block; usually from the stack.
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* Basically a pointer to argc.
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* void (*onexit)(void) -- Function to install into onexit
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*/
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#include <stddef.h>
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#include <stdlib.h>
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#include <stdint.h>
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#include <klibc/compiler.h>
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#include <elf.h>
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char **environ;
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__noreturn __libc_init(uintptr_t *elfdata, void (*onexit)(void))
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{
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int argc;
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char **argv, **envp, **envend;
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struct auxentry {
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uintptr_t type;
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uintptr_t v;
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} *auxentry;
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typedef int (*main_t)(int, char **, char **);
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main_t main_ptr = NULL;
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(void)onexit; /* For now, we ignore this... */
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argc = (int)*elfdata++;
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argv = (char **)elfdata;
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envp = argv+(argc+1);
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/* The auxillary entry vector is after all the environment vars */
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for ( envend = envp ; *envend ; envend++ );
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auxentry = (struct auxentry *)(envend+1);
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while ( auxentry->type ) {
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if ( auxentry->type == AT_ENTRY ) {
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main_ptr = (main_t)(auxentry->v);
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break;
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}
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auxentry++;
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}
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environ = envp;
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exit(main_ptr(argc, argv, envp));
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}
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