From: John Tsiombikas Date: Tue, 2 Jan 2024 18:53:43 +0000 (+0200) Subject: added relevant parts of libgcc X-Git-Url: http://git.mutantstargoat.com/user/nuclear/?a=commitdiff_plain;h=cb7d3d359cefcf199f71e387d00049ec656bc0bf;p=mdlife added relevant parts of libgcc --- diff --git a/.gitignore b/.gitignore index e34392b..8497e91 100644 --- a/.gitignore +++ b/.gitignore @@ -7,3 +7,8 @@ *.z80 tools/pngdump/pngdump core +disasm +.cache/ +*.json +*.png +data/ diff --git a/Makefile b/Makefile index b69ecbe..7ad74b6 100644 --- a/Makefile +++ b/Makefile @@ -1,6 +1,6 @@ csrc = $(wildcard src/*.c) $(wildcard src/libc/*.c) -asrc = $(wildcard src/*.s) -aSsrc = $(wildcard src/*.S) +asrc = $(wildcard src/*.s) $(wildcard src/libc/*.s) +aSsrc = $(wildcard src/*.S) $(wildcard src/libc/*.S) obj = $(asrc:.s=-asm.o) $(aSsrc:.S=-asm.o) $(csrc:.c=.o) dep = $(csrc:.c=.d) $(aSsrc:.S=-asm.d) @@ -24,12 +24,13 @@ CC = $(TC)gcc AS = $(TC)as LD = $(TC)ld OBJCOPY = $(TC)objcopy +OBJDUMP = $(TC)objdump CFLAGS = -m68000 -ffreestanding -fno-builtin -fcommon $(warn) $(dbg) $(opt) $(def) $(inc) -MMD CPPFLAGS = $(def) ASFLAGS = -m68000 $(inc) -LDFLAGS = -T megadrive.ld -print-gc-sections \ - -L/usr/lib/gcc-cross/m68k-linux-gnu/11 -lgcc +LDFLAGS = -T megadrive.ld -print-gc-sections +# -L/usr/lib/gcc-cross/m68k-linux-gnu/11 -lgcc Z80AS = vasmz80_oldstyle Z80ASFLAGS = -Fvobj @@ -46,6 +47,9 @@ $(elf): $(obj) $(z80bin): $(z80obj) $(Z80LD) -o $@ $(Z80LDFLAGS) $(z80obj) +disasm: $(elf) + $(OBJDUMP) -D $< >$@ + src/data-asm.o: src/data.s data/font8x8.img data/cellspr.img src/z80prog-asm.o: src/z80prog.s $(z80bin) diff --git a/src/libc/gcc.S b/src/libc/gcc.S new file mode 100644 index 0000000..add726d --- /dev/null +++ b/src/libc/gcc.S @@ -0,0 +1,45 @@ +/* libgcc routines for 68000 w/o floating-point hardware. + Copyright (C) 1994-2019 Free Software Foundation, Inc. + +This file is part of GCC. + +GCC is free software; you can redistribute it and/or modify it +under the terms of the GNU General Public License as published by the +Free Software Foundation; either version 3, or (at your option) any +later version. + +This file is distributed in the hope that it will be useful, but +WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +General Public License for more details. + +Under Section 7 of GPL version 3, you are granted additional +permissions described in the GCC Runtime Library Exception, version +3.1, as published by the Free Software Foundation. + +You should have received a copy of the GNU General Public License and +a copy of the GCC Runtime Library Exception along with this program; +see the files COPYING3 and COPYING.RUNTIME respectively. If not, see +. */ + +/* Use this one for any 680x0; assumes no floating point hardware. + The trailing " '" appearing on some lines is for ANSI preprocessors. Yuk. + Some of this code comes from MINIX, via the folks at ericsson. + D. V. Henkel-Wallace (gumby@cygnus.com) Fete Bastille, 1992 +*/ + + + .text + .globl __mulsi3 +__mulsi3: + move.w 4(%sp), %d0 /* x0 -> d0 */ + mulu.w 10(%sp), %d0 /* x0*y1 */ + move.w 6(%sp), %d1 /* x1 -> d1 */ + mulu.w 8(%sp), %d1 /* x1*y0 */ + add.w %d1, %d0 + swap %d0 + clr.w %d0 + move.w 6(%sp), %d1 /* x1 -> d1 */ + mulu.w 10(%sp), %d1 /* x1*y1 */ + add.l %d1, %d0 + rts diff --git a/src/libc/gcc.c b/src/libc/gcc.c new file mode 100644 index 0000000..890678f --- /dev/null +++ b/src/libc/gcc.c @@ -0,0 +1,110 @@ +/* Copyright (C) 2000-2019 Free Software Foundation, Inc. + +This file is part of GCC. + +GCC is free software; you can redistribute it and/or modify it under +the terms of the GNU General Public License as published by the Free +Software Foundation; either version 3, or (at your option) any later +version. + +GCC is distributed in the hope that it will be useful, but WITHOUT ANY +WARRANTY; without even the implied warranty of MERCHANTABILITY or +FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License +for more details. + +Under Section 7 of GPL version 3, you are granted additional +permissions described in the GCC Runtime Library Exception, version +3.1, as published by the Free Software Foundation. + +You should have received a copy of the GNU General Public License and +a copy of the GCC Runtime Library Exception along with this program; +see the files COPYING3 and COPYING.RUNTIME respectively. If not, see +. */ + +unsigned long +__udivmodsi4(unsigned long num, unsigned long den, int modwanted) +{ + unsigned long bit = 1; + unsigned long res = 0; + + while (den < num && bit && !(den & (1L<<31))) + { + den <<=1; + bit <<=1; + } + while (bit) + { + if (num >= den) + { + num -= den; + res |= bit; + } + bit >>=1; + den >>=1; + } + if (modwanted) return num; + return res; +} + +long +__divsi3 (long a, long b) +{ + int neg = 0; + long res; + + if (a < 0) + { + a = -a; + neg = !neg; + } + + if (b < 0) + { + b = -b; + neg = !neg; + } + + res = __udivmodsi4 (a, b, 0); + + if (neg) + res = -res; + + return res; +} + +long +__modsi3 (long a, long b) +{ + int neg = 0; + long res; + + if (a < 0) + { + a = -a; + neg = 1; + } + + if (b < 0) + b = -b; + + res = __udivmodsi4 (a, b, 1); + + if (neg) + res = -res; + + return res; +} + + +long +__udivsi3 (long a, long b) +{ + return __udivmodsi4 (a, b, 0); +} + +long +__umodsi3 (long a, long b) +{ + return __udivmodsi4 (a, b, 1); +} +