diff options
| author | Eric Andersen <andersen@codepoet.org> | 2004-07-16 11:09:34 +0000 |
|---|---|---|
| committer | Eric Andersen <andersen@codepoet.org> | 2004-07-16 11:09:34 +0000 |
| commit | c3d50a69839f8d80fc7244fde6e4a57e5e39dd36 (patch) | |
| tree | c9e27baac7541384b806cce0845f28c1f59b5a2e /libc/sysdeps/linux/nios2/crt0.S | |
| parent | 3cf731bf40f153a73373798085d1f45a80b972d6 (diff) | |
Pete Popov writes:
Hi Erik,
I'm not sure why the NIOS support is not in uClibc -- perhaps the patch
was rejected or never submitted? In any case, I'm playing with some NIOS
stuff and created this patch against 0.9.26. The work was done by
Microtronix. I'm not sure who else contributed to it. It would be great
to have the NIOS support available in uClibc so developers don't have to
go searching for these bits.
Pete
Diffstat (limited to 'libc/sysdeps/linux/nios2/crt0.S')
| -rw-r--r-- | libc/sysdeps/linux/nios2/crt0.S | 64 |
1 files changed, 64 insertions, 0 deletions
diff --git a/libc/sysdeps/linux/nios2/crt0.S b/libc/sysdeps/linux/nios2/crt0.S new file mode 100644 index 000000000..95c9450cd --- /dev/null +++ b/libc/sysdeps/linux/nios2/crt0.S @@ -0,0 +1,64 @@ +/* + * libc/sysdeps/linux/nios2/crt0.S -- entry point for linux/nios2 + * + * Copyright (C) 2004,05,06 Microtronix Datacom Ltd + * + * 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 Wentao Xu <wentao@microtronix.com> + * + */ + +#include <features.h> +#include <asm/unistd.h> + + .global _start + .type __start,@function + .weak _init + .weak _fini + .type __uClibc_start_main,@function + .type __h_errno_location, @function + .type _stdio_init, @function + .type _stdio_term, @function + .text + .balign 4 +_start: + nop + br 0f + .long _stext /* start address of .text + 4 */ + .long _etext /* start address of .data */ + .long _edata /* start address of .bss */ +0: + /* load gp */ + movhi gp, %hiadj(_gp) + addi gp, gp, %lo(_gp) + + /* load argc, argv, envp from stack */ + ldw r4, 0(sp) + ldw r5, 4(sp) + ldw r6, 8(sp) + + /* load the 4th arg */ + movhi r7, %hi(_init) + ori r7, r7, %lo(_init) + + /* reuse the argc stack slot for the 5th arg */ + movhi r8, %hi(_fini) + ori r8, r8, %lo(_fini) + stw r8, 0(sp) + + /* call uClibc_main, shouldn't return */ +#ifdef __PIC__ + /* just pray 16 bit offset is enough */ + br __uClibc_start_main +#else + call __uClibc_start_main +#endif + + /* crash in the event of return */ +__exit: + movui r2, TRAP_ID_SYSCALL + movui r3, __NR_exit + trap
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