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Diffstat (limited to 'libgloss/nds32/crt0.S')
| -rw-r--r-- | libgloss/nds32/crt0.S | 116 |
1 files changed, 0 insertions, 116 deletions
diff --git a/libgloss/nds32/crt0.S b/libgloss/nds32/crt0.S deleted file mode 100644 index d12be761f..000000000 --- a/libgloss/nds32/crt0.S +++ /dev/null @@ -1,116 +0,0 @@ -/* -Copyright (c) 2013 Andes Technology Corporation. -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. - - The name of the company may not 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 RED HAT INCORPORATED 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. -*/ - -##============================================================================== -## -## crt0.S -## -## nds32 startup code -## -##============================================================================== - - -##------------------------------------------------------------------------------ -## Vector table setup -##------------------------------------------------------------------------------ - .section .nds32_init, "ax" - j _start - -##------------------------------------------------------------------------------ -## Startup code implementation -##------------------------------------------------------------------------------ - .section .text - .weak _SDA_BASE_ - .weak _FP_BASE_ - .global _start - .type _start, @function - .align 2 -_start: -.L_fp_gp_lp_init: - /* Initialization for $fp, $gp, and $lp. The _SDA_BASE_ location - stands for Small Data Access. */ - la $fp, _FP_BASE_ - la $gp, _SDA_BASE_ - movi $lp, #0 - -.L_stack_init: - /* Initialization for $sp and make sure it is 8-byte aligned. */ - la $sp, _stack - movi $r0, #-8 /* Set $r0 as 0xFFFFFFF8. */ - and $sp, $sp, $r0 - -.L_bss_clear: - /* Clear bss section. */ - la $r3, _end - la $r0, _edata - beq $r0, $r3, .L_call_main /* Branch if no bss. */ - sub $r1, $r3, $r0 /* Size to be clear. */ - - /* Set $r2 as how many words to be clear. - Set $r1 as how many bytes are less than a woard to be clear. */ - srli $r2, $r1, #2 - andi $r1, $r1, #3 - beqz $r3, .Lbyte_clear - - la $r4, #0x00000000 -.Lword_clear: - swi.bi $r4, [$r0], #4 - addi $r2, $r2, #-1 - bnez $r2, .Lword_clear /* Loop again ? */ - beqz $r1, .Lend_bss - -.Lbyte_clear: - sbi.bi $r4, [$r0], #1 - addi $r1, $r1, #-1 - bnez $r1, .Lbyte_clear -.Lend_bss: - - -.L_call_main: - la $r15, main - jral $r15 - -.L_terminate_program: - /* There are two ways to terminate program: - 1. User "syscall 0x1" directly. - 2. Call exit. The return value $r0 from main() is - implicitly passed as argument. - - Currently, we use option 2 as a solution to follow C99 5.1.2.2.3, - but aware that general exit() will do some cleanup procedures - which may result in large-memory-footprints. */ - la $r15, exit - jral $r15 - -.L_forever_loop: - /* Should never return here. */ - b .L_forever_loop - - .size _start, .-_start |