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Diffstat (limited to 'c/src/lib/libbsp/mips/csb350/start/start.S')
| -rw-r--r-- | c/src/lib/libbsp/mips/csb350/start/start.S | 122 |
1 files changed, 0 insertions, 122 deletions
diff --git a/c/src/lib/libbsp/mips/csb350/start/start.S b/c/src/lib/libbsp/mips/csb350/start/start.S deleted file mode 100644 index 9aea3f4cae..0000000000 --- a/c/src/lib/libbsp/mips/csb350/start/start.S +++ /dev/null @@ -1,122 +0,0 @@ -/* - * start.S -- startup file for Cogent CSB350 Au1100 based board - * - * Copyright (c) 2005 by Cogent Computer Systems - * Written by Jay Monkman <jtm@lopingdog.com> - * - * The license and distribution terms for this file may be - * found in the file LICENSE in this distribution or at - * http://www.rtems.org/license/LICENSE. - * - */ - -#include <rtems/asm.h> -#include <bsp/regs.h> - - .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 */ - - li v0, SR_CU1|SR_PE|SR_FR|SR_KX|SR_SX|SR_UX - mtc0 v0, C0_SR - mtc0 zero, C0_CAUSE - -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 - -/* - * 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 _sys_exit - .ent _sys_exit -_sys_exit: -7: -#ifdef GCRT0 - jal _mcleanup - nop -#endif - /* break inst. 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 */ |