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- /* 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
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