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Diffstat (limited to 'libgloss/nds32/crt1.S')
| -rw-r--r-- | libgloss/nds32/crt1.S | 202 |
1 files changed, 0 insertions, 202 deletions
diff --git a/libgloss/nds32/crt1.S b/libgloss/nds32/crt1.S deleted file mode 100644 index ec8b86683..000000000 --- a/libgloss/nds32/crt1.S +++ /dev/null @@ -1,202 +0,0 @@ -/* -Copyright (c) 2013-2014 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. -*/ - -##============================================================================== -## -## crt1.S -## -## nds32 startup code -## -##============================================================================== - -#include "syscall_extra.h" - -##------------------------------------------------------------------------------ -## Vector table setup -##------------------------------------------------------------------------------ - .section .nds32_init, "ax" - j _start - -##------------------------------------------------------------------------------ -## Startup code implementation -##------------------------------------------------------------------------------ - .section .text - .weak _SDA_BASE_ - .weak _ITB_BASE_ - .weak _arg_init - .weak __pre_c_init - .weak __post_c_init - .weak _call_exit - .global _start - .type _start, @function - .align 2 -_start: - /* The initialization sequence really does matter !!! - The global pointer must be - initialized precedence over all others. */ - -.L_init_gp: - /* Initialization for global pointer. The symbol _SDA_BASE_ is - determined by Linker. SDA stands for Small Data Access. */ - la $gp, _SDA_BASE_ - -#if __NDS32_EXT_EX9__ -.L_init_itb: - /* Initialization for Instruction Table Base (ITB). - The symbol _ITB_BASE_ is determined by Linker. - Set $ITB only if MSC_CFG.EIT (cr4.b'24) is set. */ - mfsr $r0, $MSC_CFG - srli $r0, $r0, 24 - andi $r0, $r0, 0x1 - beqz $r0, 1f /* Fall through ? */ - la $r0, _ITB_BASE_ - mtusr $r0, $ITB -1: -#endif - -.L_init_sp: - /* Initialization for stack pointer. The symbol _stack is defined - in linker script. Make sure $sp is 8-byte aligned. */ - la $sp, _stack -#if __NDS32_ISA_V3__ - bitci $sp, $sp, #7 -#else - movi $r0, #-8 /* Set $r0 as 0xFFFFFFF8. */ - and $sp, $sp, $r0 -#endif - -#if __NDS32_EXT_FPU_SP__ || __NDS32_EXT_FPU_DP__ -.L_init_fpu: - /* Initialize FPU - Set FUCOP_CTL.CP0EN (fucpr.b'0). */ - mfsr $r0, $FUCOP_CTL - ori $r0, $r0, 0x1 - mtsr $r0, $FUCOP_CTL - dsb - /* According to [bugzilla #9425], set flush-to-zero mode. - That is, set $FPCSR.DNZ(b'12) = 1. */ - FMFCSR $r0 - ori $r0, $r0, 0x1000 - FMTCSR $r0 - dsb -#endif - -.L_pre_c_init: - ! call __pre_c_init if provided - ! sample __pre_c_init is in BSP - la $r15, __pre_c_init ! load address of __pre_c_init - beqz $r15, .L_zero_out_bss ! check existence of __pre_c_init - jral $r15 ! pre-c-runtime initialization - -.L_zero_out_bss: - /* Zero out the bss section. - Equivalence C code for follow part: - if (_end == _edata) goto .L_call_main - unsinged int *ptr = _edata; - while (ptr != _end) - *ptr++ = 0 - $r0 = ptr/_edata - $r1 = _end - $r2 = 0 - */ - la $r0, _edata - la $r1, _end - movi $r2, #0 - beq $r0, $r1, .L_cpp_init /* Branch if no bss. */ -.Lword_clear: - swi.bi $r2, [$r0], #4 - bne $r0, $r1, .Lword_clear - -.L_cpp_init: - /* Call '_init' to invoke constructors. */ - jal _init - /* Register '_fini' into atexit() to invoke destructors when - exit() has been reached. */ - la $r0, _fini - jal atexit - -.L_post_c_init: - ! call __post_c_init if provided - ! no sample __post_c_init is provided - la $r15, __post_c_init ! load address of __post_c_init - beqz $r15, .L_arg_init ! check existence of __post_c_init - jral $r15 ! post-c-runtime initialization - -.L_arg_init: - ! argc/argv initialization if necessary - la $r7, _arg_init ! get address of _arg_init - beqz $r7, .L_clean_reg ! if there isn't _arg_init, go main - addi $sp, $sp, -512 ! allocate space for command line - ! and arguments - move $r6, $sp ! r6 = buffer addr of cmd line - move $r0, $r6 ! r0 = buffer addr of cmd line - syscall SYS_getcmdline ! get cmd line - move $r0, $r6 ! r0 = buffer addr of cmd line - addi $r1, $r6, 256 ! r1 = argv - jral $r7 ! init argc/argv - addi $r1, $r6, 256 ! r1 = argv - b .L_call_main - -.L_clean_reg: - /* Prepare argc/argv/env for main function. - Since there is no operating system so far, - we set $r0, $r1, and $r2 to be zero. - Note: $r2 already set to zero in .L_zero_out_bss: code fragment. */ - movi $r0, 0 - movi $r1, 0 - movi $r2, 0 - -.L_call_main: - /* Call 'main'. */ - bal main - - /* Call _call_exit. */ - ! call _call_exit if necessary; default implementation is in crtexit.c - la $r15, _call_exit ! load address of _call_exit - beqz $r15, .L_terminate_program ! no _call_exit? go exit - jral $r15 ! _call_exit will never return - -.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. */ - - bal exit - -.L_forever_loop: - /* Should never return here. */ - b .L_forever_loop - - .size _start, .-_start |