diff options
Diffstat (limited to 'libc/sysdeps/linux/bfin/crt1.S')
| -rw-r--r-- | libc/sysdeps/linux/bfin/crt1.S | 122 |
1 files changed, 88 insertions, 34 deletions
diff --git a/libc/sysdeps/linux/bfin/crt1.S b/libc/sysdeps/linux/bfin/crt1.S index b9b6e3b86..ead8dbfbe 100644 --- a/libc/sysdeps/linux/bfin/crt1.S +++ b/libc/sysdeps/linux/bfin/crt1.S @@ -1,23 +1,35 @@ -/* 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. - */ +/* 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: -* [SP] argc argument counter (integer) +* 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 -* R2=__init -* SP=__fini +* R1=*argv[0] +* R2=*envp[0] */ #include <features.h> @@ -29,44 +41,86 @@ .global ___uClibc_main; .type ___uClibc_main,STT_FUNC; -#define __UCLIBC_CTOR_DTOR__ -#if defined(__UCLIBC_CTOR_DTOR__) -.weak __init; -.weak __fini; -#endif +/* 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: +#ifdef __BFIN_FDPIC__ + /* 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; - -/* Load register R0 (argc) from the stack to its final resting place */ + +/* Load register R1 (argc) from the stack to its final resting place */ P0 = SP; - R0 = [P0++]; + R1 = [P0++]; -/* Copy argv pointer into R1 */ - R1 = P0; +/* Copy argv pointer into R2 -- which its final resting place */ + R2 = P0; -#if defined(__UCLIBC_CTOR_DTOR__) -/* Load __init into R2 */ - R2.H = __init; - R2.L = __init; +/* 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; -/* Load __fini onto the stack */ - SP += -16; + SP += -24; + [SP + 12] = R3; + +/* 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]; +#else + R3.H = __init; + R3.L = __init; +#endif + [SP+16] = R3; +#ifdef __BFIN_FDPIC__ + R3 = [P3 + __fini@FUNCDESC_GOT17M4]; +#else R3.H = __fini; R3.L = __fini; - [SP+12] = R3; -#else -/* Just fixup the stack */ - sp += -12; +#endif + [SP+20] = R3; +#else /* no ctor/dtor handling */ + R3 = 0; + [SP + 16] = R3; + [SP + 20] = R3; #endif -/* Ok, now run uClibc's main() -- shouldn't return */ +#ifdef __BFIN_FDPIC__ + R0 = [P3 + _main@FUNCDESC_GOT17M4]; +#else + R0.H = _main; + R0.L = _main; +#endif jump.l ___uClibc_main; - -.size __start,.-__start |