| 1 | /* |
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| 2 | * Lattice Mico32 C startup code. |
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| 3 | * Contributed by Jon Beniston <jon@beniston.com> |
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| 4 | * |
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| 5 | * Redistribution and use in source and binary forms, with or without |
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| 6 | * modification, are permitted provided that the following conditions |
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| 7 | * are met: |
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| 8 | * 1. Redistributions of source code must retain the above copyright |
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| 9 | * notice, this list of conditions and the following disclaimer. |
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| 10 | * 2. Redistributions in binary form must reproduce the above copyright |
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| 11 | * notice, this list of conditions and the following disclaimer in the |
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| 12 | * documentation and/or other materials provided with the distribution. |
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| 13 | * |
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| 14 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
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| 15 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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| 16 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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| 17 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
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| 18 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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| 19 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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| 20 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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| 21 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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| 22 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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| 23 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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| 24 | * SUCH DAMAGE. |
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| 25 | */ |
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| 26 | |
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| 27 | .section .boot, "ax", @progbits |
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| 28 | |
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| 29 | /* Program starts here */ |
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| 30 | |
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| 31 | .global _start |
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| 32 | _start: |
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| 33 | |
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| 34 | /* Setup stack and global pointer */ |
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| 35 | mvhi sp, hi(_fstack) |
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| 36 | ori sp, sp, lo(_fstack) |
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| 37 | mvhi gp, hi(_gp) |
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| 38 | ori gp, gp, lo(_gp) |
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| 39 | |
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| 40 | /* Clear BSS */ |
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| 41 | mvhi r1, hi(_fbss) |
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| 42 | ori r1, r1, lo(_fbss) |
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| 43 | mvi r2, 0 |
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| 44 | mvhi r3, hi(_ebss) |
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| 45 | ori r3, r3, lo(_ebss) |
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| 46 | sub r3, r3, r1 |
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| 47 | calli memset |
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| 48 | |
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| 49 | /* Call C++ constructors */ |
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| 50 | calli _init |
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| 51 | |
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| 52 | /* Call C++ destructors on exit */ |
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| 53 | mvhi r1, hi(_fini) |
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| 54 | ori r1, r1, lo(_fini) |
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| 55 | calli atexit |
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| 56 | |
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| 57 | /* Call main program */ |
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| 58 | mvi r1, 0 |
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| 59 | mvi r2, 0 |
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| 60 | mvi r3, 0 |
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| 61 | calli main |
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| 62 | |
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| 63 | /* Call exit, which doesn't return, to perform any clean up */ |
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| 64 | calli exit |
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