diff options
Diffstat (limited to 'libc/sysdeps/linux/microblaze/crt0.S')
| -rw-r--r-- | libc/sysdeps/linux/microblaze/crt0.S | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/libc/sysdeps/linux/microblaze/crt0.S b/libc/sysdeps/linux/microblaze/crt0.S new file mode 100644 index 000000000..67416b329 --- /dev/null +++ b/libc/sysdeps/linux/microblaze/crt0.S @@ -0,0 +1,47 @@ +/* + * libc/sysdeps/linux/microblaze/crt0.S -- Initial program entry point for linux/microblaze + * + * 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 <clinkage.h> + +/* Upon entry, the stack contains the following data: + argc, argv[0], ..., argv[argc-1], 0, envp[0], ..., 0 +*/ + + .text +C_ENTRY(_start): + lw r5, r0, r1 // Arg 0: argc + + addi r6, r1, 4 // Arg 1: argv + + // Arg 2: envp + addi r3, r5, 1 // skip argc elements to get envp start + // ...plus the NULL at the end of argv + add r3, r3, r3 // Make word offset + add r3, r3, r3 + add r7, r6, r3 // add to argv to get offset + + // Load SDAs + la r2, r0, C_SYMBOL_NAME(_SDA_BASE_) + la r13, r0, C_SYMBOL_NAME(_SDA2_BASE_) + + // tail-call uclibc's startup routine + brid C_SYMBOL_NAME(__uClibc_main) + nop + + +/* 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. */ +L_dummy_main_reference: + .long C_SYMBOL_NAME(main) |