From fbcd7c8fa65eb695e96a62ea1c1ac7a024fa9dfc Mon Sep 17 00:00:00 2001 From: Sebastian Huber Date: Fri, 20 Apr 2018 10:19:28 +0200 Subject: bsps: Move start files to bsps This patch is a part of the BSP source reorganization. Update #3285. --- c/src/lib/libbsp/mips/jmr3904/start/start.S | 196 ---------------------------- 1 file changed, 196 deletions(-) delete mode 100644 c/src/lib/libbsp/mips/jmr3904/start/start.S (limited to 'c/src/lib/libbsp/mips/jmr3904/start/start.S') diff --git a/c/src/lib/libbsp/mips/jmr3904/start/start.S b/c/src/lib/libbsp/mips/jmr3904/start/start.S deleted file mode 100644 index 92c0ddd956..0000000000 --- a/c/src/lib/libbsp/mips/jmr3904/start/start.S +++ /dev/null @@ -1,196 +0,0 @@ -/* - * start.S -- startup file for JMR3904 BSP based upon crt0.S from - * newlib-1.8.2/libgloss/mips and adapted for RTEMS. - * - * crt0.S -- startup file for MIPS. - * - * Copyright (c) 1995, 1996, 1997 Cygnus Support - * - * 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. - */ - -#include -#include - -#ifdef __mips16 -/* This file contains 32 bit assembly code. */ - .set nomips16 -#endif - -/* This is for referencing addresses that are not in the .sdata or - .sbss section under embedded-pic, or before we've set up gp. */ -#ifdef __mips_embedded_pic -# ifdef __mips64 -# define LA(t,x) la t,x-PICBASE ; daddu t,s0,t -# else -# define LA(t,x) la t,x-PICBASE ; addu t,s0,t -# endif -#else /* __mips_embedded_pic */ -# define LA(t,x) la t,x -#endif /* __mips_embedded_pic */ - - .text - .align 2 - -/* Without the following nop, GDB thinks _start is a data variable. - * This is probably a bug in GDB in handling a symbol that is at the - * start of the .text section. - */ - nop - - .globl _start - .ent _start -_start: - .set noreorder - /* Get the address of start into $5 in a position independent fashion. - ** This lets us know whether we have been relocated or not. - */ - $LF1 = . + 8 - bal $LF1 - nop -_branch: - move $5, $31 # $5 == where are we - li $6, 0x8800000c # $6 == where we want to be -/* #la $6,_branch */ - beq $5, $6, _start_in_ram - nop - /* relocate the code from EEPROM to RAM */ - la $7, _edata -relocate: - lw $8, ($5) # $8 = *EEPROM - addu $5, $5, 4 # EEPROM++ - sw $8, ($6) # *RAM = $8 - addu $6, $6, 4 # RAM++ - bne $6, $7, relocate # copied all the way to edata? - nop - la $6, _start_in_ram - jr $6 - nop - .end _start - - .globl _start_in_ram - .ent _start_in_ram -_start_in_ram: - nop - -#ifdef __mips_embedded_pic - PICBASE = .+8 - bal PICBASE - nop - move s0,$31 -#endif - - li v0, SR_CU1|SR_PE|SR_FR|SR_KX|SR_SX|SR_UX - mtc0 v0, C0_SR - mtc0 zero, C0_CAUSE - -/* Check for FPU presence */ -#ifndef __mips_soft_float -/* This doesn't work if there is no FPU. We get illegal instruction - exceptions. */ - li t2,0xAAAA5555 - mtc1 t2,fp0 /* write to FPR 0 */ - mtc1 zero,fp1 /* write to FPR 1 */ - mfc1 t0,fp0 - mfc1 t1,fp1 - nop - bne t0,t2,1f /* check for match */ - nop - bne t1,zero,1f /* double check */ - nop -#ifndef __mips64 /* Clear the FR bit */ - li v0, SR_CU1|SR_PE|SR_KX|SR_SX|SR_UX - mtc0 v0, C0_SR -#endif - j 2f - nop -#endif -1: - li v0, SR_PE|SR_FR|SR_KX|SR_SX|SR_UX - mtc0 v0, C0_SR -2: -/* Fix high bits, if any, of the PC so that exception handling - doesn't get confused. */ - LA (v0, 3f) - jr v0 - nop -3: - LA (gp, _gp) # set the global data pointer - .end _start_in_ram - -/* - * zero out the bss section. - */ - .globl zerobss - .ent zerobss -zerobss: - LA (v0, _fbss) - LA (v1, _end) -3: - sw zero,0(v0) - bltu v0,v1,3b - addiu v0,v0,4 # executed in delay slot - - la t0, _stack_init # initialize stack so we - /* We must subtract 24 bytes for the 3 8 byte arguments to main, in - case main wants to write them back to the stack. The caller is - supposed to allocate stack space for parameters in registers in - the old MIPS ABIs. We must do this even though we aren't passing - arguments, because main might be declared to have them. - - Some ports need a larger alignment for the stack, so we subtract - 32, which satisifes the stack for the arguments and keeps the - stack pointer better aligned. */ - subu t0,t0,32 - move sp,t0 # set stack pointer - .end zerobss - - .globl exit .text - .globl init - .ent init -init: - - move a0,zero # set command line to 0 - jal boot_card # call the program start function - nop - - /* fall through to the "exit" routine */ - jal _sys_exit /* call libc exit to run the G++ */ - /* destructors */ - move a0,v0 /* pass through the exit code */ - .end init - -/* - * _sys_exit -- Exit from the application. Normally we cause a user trap - * to return to the ROM monitor for another run. NOTE: This is - * the only other routine we provide in the crt0.o object, since - * it may be tied to the "_start" routine. It also allows - * executables that contain a complete world to be linked with - * just the crt0.o object. - */ - .globl bsp_reset -bsp_reset: - .globl _sys_exit - .ent _sys_exit -_sys_exit: -7: -#ifdef GCRT0 - jal _mcleanup - nop -#endif - /* break instruction can cope with 0xfffff, but GAS limits the range: */ - break 1023 - nop - b 7b # but loop back just in-case - nop - .end _sys_exit - -/* EOF crt0.S */ -- cgit v1.2.3