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Diffstat (limited to 'libgloss/iq2000/crt0.S')
| -rw-r--r-- | libgloss/iq2000/crt0.S | 56 |
1 files changed, 56 insertions, 0 deletions
diff --git a/libgloss/iq2000/crt0.S b/libgloss/iq2000/crt0.S new file mode 100644 index 000000000..12d2a5b0a --- /dev/null +++ b/libgloss/iq2000/crt0.S @@ -0,0 +1,56 @@ +##============================================================================== +## +## crt0.S +## +## IQ2000 startup code +## +##============================================================================== +## +## Copyright (c) 2000, Cygnus Solutions, A Red Hat Company +## +## The authors hereby grant permission to use, copy, modify, distribute, +## and license this software and its documentation for any purpose, provided +## that existing copyright notices are retained in all copies and that this +## notice is included verbatim in any distributions. No written agreement, +## license, or royalty fee is required for any of the authorized uses. +## Modifications to this software may be copyrighted by their authors +## and need not follow the licensing terms described here, provided that +## the new terms are clearly indicated on the first page of each file where +## they apply. +## + +##------------------------------------------------------------------------------ + + .file "crt0.S" + +##------------------------------------------------------------------------------ +## Startup code + .section .text + .global _start +_start: + lui %29,%hi(__stack) + ori %29,%29,%lo(__stack) + + lui %24,%hi(_edata) # get start of bss + ori %24,%24,%lo(_edata) + + lui %25,%hi(_end) # get end of bss + ori %25,%25,%lo(_end) + + beq %24,%25,.L0 # check if end and start are the same + # do nothing if no bss + +.L1: + sb %0,0(%24) # clear a byte and bump pointer + addi %24,%24,1 + bne %24,%25,.L1 + nop + +.L0: + jal _main # call _main to run ctors/dtors + nop + xor %4,%4,%4 + jal main # call main program + xor %5,%5,%5 + jal exit # all done, no need to return or + or %4,%0,%2 # exit with main's return value |