/* Copyright (C) 1991, 1992 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Library General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. The GNU C Library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public License for more details. You should have received a copy of the GNU Library General Public License along with the GNU C Library; see the file COPYING.LIB. If not, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ /* 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> #ifndef L_Scrt1 .text .align 2 .global __start; .type __start,STT_FUNC; .weak __init; .weak __fini; .global ___uClibc_main; .type ___uClibc_main,STT_FUNC; /* Stick in a dummy reference to main(), so that if an application * is linking when the main() function is in a static library (.a) * we can be sure that main() actually gets linked in */ .type _main,STT_FUNC; __start: #if defined(__BFIN_FDPIC__) && !defined(__pie__) /* P0 contains a pointer to the program's load map. */ call .Lcall; .Lcall: R4 = RETS; SP += -12; R0.L = .Lcall; R0.H = .Lcall; R1.L = __ROFIXUP_LIST__; R1.H = __ROFIXUP_LIST__; R2.L = __ROFIXUP_END__; R2.H = __ROFIXUP_END__; R1 = R1 - R0; R1 = R1 + R4; R2 = R2 - R0; R2 = R2 + R4; R0 = P0; CALL ___self_reloc; SP += 12; P3 = R0; #endif /* clear the frame pointer and the L registers. */ FP = 0; L0 = 0; L1 = 0; L2 = 0; L3 = 0; #ifdef __ID_SHARED_LIB__ CALL ___shared_flat_add_library; #endif /* Load register R1 (argc) from the stack to its final resting place */ P0 = SP; R1 = [P0++]; /* Copy argv pointer into R2 -- which its final resting place */ R2 = P0; /* Skip to the end of argv and put a pointer to the environment in [SP + 12] */ R3 = R1; R3 <<= 2; R3 += 4; R3 = R2 + R3; P2 = SP; SP += -32; [SP + 12] = R3; #ifndef __BFIN_FDPIC__ R7 = 0; #endif /* Pass highest stack pointer to the app. */ [SP + 28] = P2; /* Store the pointer to ld.so's fini that we got in P1. */ [SP + 24] = R7; /* Ok, now run uClibc's main() -- shouldn't return */ #if defined L_crt1 && defined __UCLIBC_CTOR_DTOR__ #ifdef __BFIN_FDPIC__ R3 = [P3 + __init@FUNCDESC_GOT17M4]; #elif defined __ID_SHARED_LIB__ P5 = [P5 + _current_shared_library_p5_offset_]; R3 = [P5 + ___shared_flat_init@GOT]; #else R3.H = __init; R3.L = __init; #endif [SP+16] = R3; #ifdef __BFIN_FDPIC__ R3 = [P3 + __fini@FUNCDESC_GOT17M4]; #elif defined __ID_SHARED_LIB__ R3 = [P5 + ___shared_flat_fini@GOT]; #else R3.H = __fini; R3.L = __fini; #endif [SP+20] = R3; #else /* no ctor/dtor handling */ R3 = 0; [SP + 16] = R3; [SP + 20] = R3; #endif #ifdef __BFIN_FDPIC__ R0 = [P3 + _main@FUNCDESC_GOT17M4]; #elif defined __ID_SHARED_LIB__ R0 = [P5 + _main@GOT]; #else R0.H = _main; R0.L = _main; #endif #ifdef __ID_SHARED_LIB__ P0 = [P5 + ___uClibc_main@GOT]; jump (P0) #else jump.l ___uClibc_main; #endif #else .text .global lib_main .hidden lib_main .type lib_main,@function lib_main: RETS = [SP++]; P0 = [P5 + ___shared_flat_add_library@GOT]; JUMP (P0); .hidden _current_shared_library_p5_offset_ #endif