diff options
Diffstat (limited to 'libc/sysdeps/linux/v850/crt0.S')
| -rw-r--r-- | libc/sysdeps/linux/v850/crt0.S | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/libc/sysdeps/linux/v850/crt0.S b/libc/sysdeps/linux/v850/crt0.S new file mode 100644 index 000000000..7bfa9e004 --- /dev/null +++ b/libc/sysdeps/linux/v850/crt0.S @@ -0,0 +1,51 @@ +/* + * libc/sysdeps/linux/v850/crt0.S -- Initial program entry point for linux/v850 + * + * Copyright (C) 2001 NEC Corporation + * Copyright (C) 2001 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): + ld.w 0[sp], r6 // Arg 0: argc + + addi 4, sp, r7 // Arg 1: argv + + mov r7, r8 // Arg 2: envp + mov r6, r10 // skip argc elements to get envp start +1: add 4, r8 + add -1, r10 + bp 1b + + // Zero bss area, since we can't rely upon any loader to do so + mov hilo(C_SYMBOL_NAME(edata)), ep + mov hilo(C_SYMBOL_NAME(end)), r10 +2: sst.w r0, 0[ep] + add 4, ep + cmp ep, r10 + bne 2b + + // Load CTBP register + mov hilo(C_SYMBOL_NAME(_ctbp)), r19 + ldsr r19, ctbp + + // Load GP + mov hilo(C_SYMBOL_NAME(_gp)), gp + + // call uclibc's startup routine + jarl C_SYMBOL_NAME(__uClibc_main), lp + + // should never get here.... + jr C_SYMBOL_NAME(abort) |