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Diffstat (limited to 'libgloss/sparc/crt0.S')
| -rw-r--r-- | libgloss/sparc/crt0.S | 186 |
1 files changed, 0 insertions, 186 deletions
diff --git a/libgloss/sparc/crt0.S b/libgloss/sparc/crt0.S deleted file mode 100644 index 90e18c513..000000000 --- a/libgloss/sparc/crt0.S +++ /dev/null @@ -1,186 +0,0 @@ -/* - * C startup code for the Fujitsu SPARClite demo board - * - * Copyright (c) 1995, 1996 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 "asm.h" - -.data - .align 8 - .ascii "DaTa" ! this is the first address in the data section - .long SYM(sdata) -SYM(environ): - .long 0 - - .text - .align 8 - - .globl SYM(_start) -SYM(_start): - .globl SYM(start) -SYM(start): - /* see if the stack is already setup. if not, then default - * to using the value of %sp as set by the ROM monitor - */ - sethi %hi(__stack), %g1 - or %g1,%lo(__stack),%g1 - cmp %g0,%g1 - be 1f - mov %g1, %sp ! set the stack pointer - mov %sp, %fp -1: - - /* zero the bss section */ - sethi %hi(__bss_start),%g2 - or %g2,%lo(__bss_start),%g2 ! start of bss - sethi %hi(_end),%g3 - or %g3,%lo(_end),%g3 ! end of bss - mov %g0,%g1 ! so std has two zeros -zerobss: - std %g0,[%g2] - add %g2,8,%g2 - cmp %g2,%g3 - bleu,a zerobss - nop - -/* - * copy prom & trap vectors to sram. - */ - set 0x30000000, %l0 - set 0xfff8, %l1 - tst %l1 ! Set condition codes - -copyloop: - ldd [%l1], %l2 - std %l2, [%l0 + %l1] - bg copyloop - deccc 8, %l1 - - set 0x30000000, %l0 ! Base of new trap vector - mov %l0, %tbr ! Install the new tbr - - set SYM(win_ovf_trap), %l1 ! Setup window overflow trap - ldd [%l1], %l2 - std %l2, [%l0 + 5 * 16] - ldd [%l1 + 8], %l2 - std %l2, [%l0 + 5 * 16 + 8] - - set SYM(win_unf_trap), %l1 ! Setup window underflow trap - ldd [%l1], %l2 - std %l2, [%l0 + 6 * 16] - ldd [%l1 + 8], %l2 - std %l2, [%l0 + 6 * 16 + 8] - -/* - * Try enabling the FPU by setting EF. If that causes a trap, then we probably - * don't have an FPU. - */ - - ldd [%l0 + 2 * 16], %l4 ! Save original trap routine - set SYM(no_fpu_trap), %l1 ! Install new one - ldd [%l1], %l2 - std %l2, [%l0 + 2 * 16] - - mov %psr, %l0 - sethi %hi(0x1000), %l1 - bset %l1, %l0 -! mov %l0, %psr - - std %l4, [2 * 16] ! Restore original trap routine - - -/* - * Move the data segment from it's ROM address to RAM where it - * belongs. - */ - -relocd: -#if 0 /* This code is broken. FIXME */ - set (_sdata),%g2 ! %g2 = start of data in aout file - set SYM(environ),%g4 ! %g4 = actual data base address - set (_edata),%g3 ! %g3 = end of where data should go - subcc %g3, %g4, %g5 ! %g5 = length of data - - subcc %g4, %g2, %g0 ! need to relocate data ? - ble init - ld [%g4], %g6 - subcc %g6, 1, %g0 - be init -mvdata: - subcc %g5, 8, %g5 - ldd [%g2 + %g5], %g6 - bg mvdata -#endif - -/* - * initialize target specific stuff. Only execute these - * functions it they exist. - */ -init: - sethi %hi(SYM(hardware_init_hook)), %g1 - or %g1,%lo(SYM(hardware_init_hook)),%g1 - cmp %g0,%g1 - be 1f - nop - call SYM(hardware_init_hook) - nop - -1: - sethi %hi(SYM(software_init_hook)), %g1 - or %g1,%lo(SYM(software_init_hook)),%g1 - cmp %g0,%g1 - be 2f - nop - call SYM(software_init_hook) - nop -2: - call SYM(main) - nop - - /* call exit from the C library so atexit gets called, and the - * C++ destructors get run. This calls our exit routine below - * when it's done. - */ - call SYM(exit) - nop - -/* - * This should drop control back to the ROM monitor, if there is - * one. - */ - .globl SYM(_exit) -SYM(_exit): - call 0 - nop - -/* - * Trap handlers. - */ - - .align 8 - -SYM(win_ovf_trap): - sethi %hi(SYM(win_ovf)), %l3 - jmpl %lo(SYM(win_ovf))+%l3, %g0 - mov %wim, %l0 - nop - -SYM(win_unf_trap): - sethi %hi(SYM(win_unf)), %l3 - jmpl %lo(SYM(win_unf))+%l3, %g0 - mov %wim, %l0 - nop - -SYM(no_fpu_trap): ! Come here when no fpu exists. - jmpl %l2, %g0 ! This just skips the - rett %l2+4 ! offending instruction. |