/* Initial C runtime code for Blackfin * * Copyright (C) 2004-2006 Erik Andersen <andersen@uclibc.org> * * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball. */ /* When we enter this piece of code, the user stack looks like this: * argc argument counter (integer) * argv[0] program name (pointer) * argv[1...N] program args (pointers) * NULL * env[0...N] environment variables (pointers) * NULL * When we are done here, we want * R0=argc * R1=*argv[0] * R2=*envp[0] */ #include <features.h> .text .align 2 .global __start; .type __start,STT_FUNC; .global ___uClibc_main; .type ___uClibc_main,STT_FUNC; #if defined(__UCLIBC_CTOR_DTOR__) .type __init,%function .type __fini,%function #else .weak __init .weak __fini #endif /* When we enter, our stack looks like: [ SP ] [argc][argv]... Call ___uClibc_main(argc, argv, __init, __fini) R0 R1 R2 stack Before we call main, we want: [ SP ] [fini][argc][argv] */ __start: /* clear the frame pointer */ FP = 0; /* Load register R0 (argc) from the stack to its final resting place */ P0 = SP; R0 = [P0++]; /* Copy argv pointer into R1 */ R1 = P0; /* Load __init into R2 */ R2 = __init; /* Load __fini onto the stack */ P0 = __fini; [SP--] = P0; /* Ok, now run uClibc's main() -- shouldn't return */ sp += -8; jump.l ___uClibc_main; .size __start,.-__start