diff options
Diffstat (limited to 'libc/sysdeps/linux/microblaze/crt1.S')
| -rw-r--r-- | libc/sysdeps/linux/microblaze/crt1.S | 61 |
1 files changed, 61 insertions, 0 deletions
diff --git a/libc/sysdeps/linux/microblaze/crt1.S b/libc/sysdeps/linux/microblaze/crt1.S new file mode 100644 index 000000000..e9564cfba --- /dev/null +++ b/libc/sysdeps/linux/microblaze/crt1.S @@ -0,0 +1,61 @@ +/* + * 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 |