diff options
Diffstat (limited to 'libgloss/visium/crt0.S')
| -rw-r--r-- | libgloss/visium/crt0.S | 88 |
1 files changed, 88 insertions, 0 deletions
diff --git a/libgloss/visium/crt0.S b/libgloss/visium/crt0.S new file mode 100644 index 000000000..bb1448962 --- /dev/null +++ b/libgloss/visium/crt0.S @@ -0,0 +1,88 @@ +/* crt0.S for the Visium processor. + + Copyright (c) 2015 Rolls-Royce Controls and Data Services Limited. + All rights reserved. + + Redistribution and use in source and binary forms, with or without + modification, are permitted provided that the following conditions are met: + + * Redistributions of source code must retain the above copyright notice, + this list of conditions and the following disclaimer. + * Redistributions in binary form must reproduce the above copyright + notice, this list of conditions and the following disclaimer in the + documentation and/or other materials provided with the distribution. + * Neither the name of Rolls-Royce Controls and Data Services Limited nor + the names of its contributors may be used to endorse or promote products + derived from this software without specific prior written permission. + + THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" + AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE + LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR + CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF + SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS + INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN + CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF + THE POSSIBILITY OF SUCH DAMAGE. */ + + .weak _get_cmdline + .text + .align 4 + .global __start +__start: + /* Initialize the stack pointer. */ + moviu r1,%u _estack + movil r1,%l _estack + move.l r23,r1 + + /* Terminate the frame chain. */ + moviq r22,0 + + /* Zero the .bss segment. */ + moviu r1,%u __bss_start + movil r1,%l __bss_start + moviu r2,%u __bss_end + movil r2,%l __bss_end +.L0: + cmp.l r1,r1 + brr eq,.L1 + nop + write.b (r1),r0 + brr tr,.L0 + addi r1,1 +.L1: + /* Register __fini (destructors) with atexit. */ + moviu r1,%u __fini + moviu r2,%u atexit + movil r2,%l atexit + bra tr,r2,r21 + movil r1,%l __fini + + /* Call __init (constructors). */ + moviu r1,%u __init + movil r1,%l __init + bra tr,r1,r21 + nop + + /* Set up argc and argv. */ + moviu r3,%u _get_cmdline + movil r3,%l _get_cmdline + cmp.l r3,r0 + moviq r1,0 + bra ne,r3,r21 + moviq r2,0 + + /* Call the main program. */ + moviu r3,%u main + movil r3,%l main + bra tr,r3,r21 + nop + + /* Call exit in case the main program didn't. */ + moviu r2,%u exit + movil r2,%l exit + bra tr,r2,r21 + nop + .end |