diff options
Diffstat (limited to 'libc/sysdeps/linux/frv/crt1.S')
| -rw-r--r-- | libc/sysdeps/linux/frv/crt1.S | 121 |
1 files changed, 121 insertions, 0 deletions
diff --git a/libc/sysdeps/linux/frv/crt1.S b/libc/sysdeps/linux/frv/crt1.S new file mode 100644 index 000000000..0827feae7 --- /dev/null +++ b/libc/sysdeps/linux/frv/crt1.S @@ -0,0 +1,121 @@ +/* Copyright (C) 1991, 1992, 2003, 2004 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 Lesser General Public License as +published by the Free Software Foundation; either version 2.1 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. + +In addition to the permissions in the GNU Lesser General Public +License, the Free Software Foundation gives you unlimited +permission to link the compiled version of this file with other +programs, and to distribute those programs without any restriction +coming from the use of this file. (The GNU Lesser General Public +License restrictions do apply in other respects; for example, they +cover modification of the file, and distribution when not linked +into another program.) + +You should have received a copy of the GNU Lesser General Public +License along with the GNU C Library; see the file COPYING.LIB. If +not, see <http://www.gnu.org/licenses/>. */ + + +/* Based on ../i386/crt0.S and newlib's libgloss/frv/crt0.S */ + +/* + When we enter this piece of code, the program stack looks like this: + argc argument counter (integer) + argv[0] program name (pointer) + argv[1...N] program args (pointers) + argv[argc-1] end of args (integer) + NULL + env[0...N] environment variables (pointers) + NULL + + Also, GR16 holds a pointer to a memory map. */ + +#include <features.h> + + .text + .global _start + .type _start,%function + .weak _init + .weak _fini + .type __uClibc_main,%function + +_start: + /* Make sure the stack pointer is properly aligned. Save the + original value in gr21 such that we can get to arguments and + such from there. */ + mov.p sp, gr21 + andi sp, #-8, sp + /* At program start-up, gr16 contains a pointer to a memory + map, that we use to relocate addresses. */ + call .Lcall +.Lcall: + movsg lr, gr4 + sethi.p #gprelhi(.Lcall), gr5 + setlo #gprello(.Lcall), gr5 + sub.p gr4, gr5, gr4 + /* gr4 now holds the _gp address. */ + + mov gr16, gr8 + sethi.p #gprelhi(__ROFIXUP_LIST__), gr9 + sethi #gprelhi(__ROFIXUP_END__), gr10 + setlo.p #gprello(__ROFIXUP_LIST__), gr9 + setlo #gprello(__ROFIXUP_END__), gr10 + add.p gr9, gr4, gr9 + add gr10, gr4, gr10 + call __self_reloc + mov.p gr8, gr17 + mov gr8, gr15 + /* gr17 now holds the self-relocated _GLOBAL_OFFSET_TABLE_ + address, because the linker added its unrelocated address as + the last entry in the ROFIXUP list, and __self_reloc returns + the last entry, relocated. */ + + /* Prepare arguments for uClibc main. */ + ld @(gr21, gr0), gr8 + slli gr8, #2, gr10 + add gr21, gr10, gr10 + addi.p gr21, #4, gr9 + addi gr10, #8, gr10 + + /* Set up an invalid (NULL return address, NULL frame pointer) + callers stack frame so anybody unrolling the stack knows where + to stop */ + mov gr0, fp + movgs gr0, lr + +#if (defined L_crt1 || defined L_Scrt1) && defined __UCLIBC_CTOR_DTOR__ + /* Pass .init and .fini arguments to __uClibc_start_main(). */ + sethi.p #gotfuncdeschi(_init), gr11 + sethi #gotfuncdeschi(_fini), gr12 + setlo.p #gotfuncdesclo(_init), gr11 + setlo #gotfuncdesclo(_fini), gr12 + ld.p @(gr11, gr17), gr11 + mov gr17, gr15 + ld.p @(gr12, gr17), gr12 + call __uClibc_main +#else + mov.p gr17, gr15 + call __uClibc_main +#endif + + /* Crash if somehow `exit' returns anyways. */ + jmpl @(gr0,gr0) +.size _start,.-_start + +/* Define a symbol for the first piece of initialized data. */ + .data + .globl __data_start +__data_start: + .long 0 + .weak data_start + data_start = __data_start + |