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- /*
- * libc/sysdeps/linux/microblaze/crt1.S -- Initial program entry point for linux/microblaze
- *
- * Copyright (C) 2009 Meyer Sound Laboratories
- * Copyright (C) 2003 John Williams <jwilliams@itee.uq.edu.au>
- * Copyright (C) 2001,2002 NEC Corporation
- * Copyright (C) 2001,2002 Miles Bader <miles@gnu.org>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License. See the file COPYING.LIB in the main
- * directory of this archive for more details.
- *
- * Written by Miles Bader <miles@gnu.org>
- */
- #include <libc-symbols.h>
- /* Upon entry, the stack contains the following data:
- argc, argv[0], ..., argv[argc-1], 0, envp[0], ..., 0
- */
- .text
- .globl C_SYMBOL_NAME(_start)
- .align 4
- C_SYMBOL_NAME(_start):
- /* Load SDAs */
- la r2, r0, C_SYMBOL_NAME(_SDA2_BASE_) /* in the original source r2 was SDA, and r13 was SDA2, no idea why */
- la r13, r0, C_SYMBOL_NAME(_SDA_BASE_)
- /*
- Preparing arguments for uClibc's startup routine.
- The routine has 6 arguments, so 5 of them are placed
- into registers, one on the stack
- */
- la r5, r0, C_SYMBOL_NAME(main) /* Arg 1: main() */
- lw r6, r0, r1 /* Arg 2: argc */
- addi r7, r1, 4 /* Arg 3: argv */
- la r8, r0, _init /* Arg 4: init */
- la r9, r0, _fini /* Arg 5: fini */
- addk r10,r0,r0 /* Arg 6: rtld_fini = NULL */
- /* Reserve space for __uClibc_main to save parameters
- (Microblaze ABI stack calling convention)
- and for stack_end argument to __uClibc_main */
- add r3, r1, r0
- addi r1, r1, -32
- /* tail-call uClibc's startup routine */
- brid C_SYMBOL_NAME(__uClibc_main)
- swi r3, r1, 28 /* Arg 7: stack end [DELAY SLOT] */
- /* 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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