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Diffstat (limited to 'libgloss/mips/crt0_cygmon.S')
| -rw-r--r-- | libgloss/mips/crt0_cygmon.S | 173 |
1 files changed, 0 insertions, 173 deletions
diff --git a/libgloss/mips/crt0_cygmon.S b/libgloss/mips/crt0_cygmon.S deleted file mode 100644 index ae0a9e373..000000000 --- a/libgloss/mips/crt0_cygmon.S +++ /dev/null @@ -1,173 +0,0 @@ -/* - * crt0_cygmon.S -- Minimal startup file for MIPS targets running Cygmon. - * - * Copyright (c) 1995, 1996, 1997, 2000 Red Hat, Inc. - * - * 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. - */ - -/* - * This file contains the minimal startup code necessary. - * This will not do any hardware initialization. It is assumed that we are talking to Cygmon - * and therefore the hardware will be initialized properly. - */ - -#ifdef __mips16 -/* This file contains 32 bit assembly code. */ - .set nomips16 -#endif - -#include "regs.S" - -/* - * Set up some room for a stack. We just grab a chunk of memory. - */ -#define STACK_SIZE 0x4000 -#define GLOBAL_SIZE 0x2000 - -#define STARTUP_STACK_SIZE 0x0100 - - .comm __memsize, 12 - .comm __lstack, STARTUP_STACK_SIZE - .comm __stackbase,4 - - .text - .align 4 - /* - * 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 - la gp, _gp # set the global data pointer, defined in the linker script - .end _start - - /* - * zero out the bss section. - */ - .globl __memsize - .globl get_mem_info .text - .globl zerobss - .ent zerobss -zerobss: - la v0, _fbss # These variables are defined in the linker script - la v1, _end - -3: - sw zero, 0(v0) - bltu v0, v1, 3b - addiu v0, v0, 4 # executed in delay slot - - /* - * Setup a small stack so we can run some C code, - * and get the usable memory size. - */ - la t0, __lstack - addiu sp, t0, STARTUP_STACK_SIZE - la a0, __memsize - jal get_mem_info - nop - - /* - * Setup the stack pointer -- - * get_mem_info returns the top of memory, so just use that In - * addition, 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 v0, v0, 32 - move sp, v0 - - sw sp, __stackbase # keep this for future ref - .end zerobss - - /* - * initialize target specific stuff. Only execute these - * functions it they exist. - */ - .globl hardware_init_hook .text - .globl software_init_hook .text - .globl __do_global_dtors .text - .globl atexit .text - .globl exit .text - .globl init - .ent init -init: - la t9, hardware_init_hook # init the hardware if needed - beq t9, zero, 6f - nop - jal t9 - nop -6: - la t9, software_init_hook # init the software if needed - beq t9, zero, 7f - nop - jal t9 - nop -7: - la a0, __do_global_dtors - jal atexit - nop - -#ifdef GCRT0 - .globl _ftext - .globl _extext - la a0, _ftext - la a1, _etext - jal monstartup - nop -#endif - - move a0,zero # set argc to 0 - jal main # call the program start function - nop - - # fall through to the "exit" routine - jal exit # call libc exit to run the G++ - # destructors - move a0, v0 # pass through the exit code - .end init - -/* - * _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 _exit - .ent _exit -_exit: -7: -#ifdef GCRT0 - jal _mcleanup - nop -#endif - # Cygmon expects a break 5 - break 5 - nop - b 7b # loop back just in-case - nop - .end _exit - -/* EOF crt0.S */ |