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| author | leleraffa97@hotmail.it <leleraffa97@hotmail.it> | 2017-05-02 18:02:06 +0200 |
|---|---|---|
| committer | leleraffa97@hotmail.it <leleraffa97@hotmail.it> | 2017-05-02 18:02:06 +0200 |
| commit | 2b59b9528106aced551c85b5f93b28befd1e4b96 (patch) | |
| tree | 270e634089f8cc3be68908e16fa4d601fd7703a4 /sw/z80/crt0.s | |
| parent | Basic sys io setup (diff) | |
| parent | fix for sdcc makefile (diff) | |
| download | z80uPC-2b59b9528106aced551c85b5f93b28befd1e4b96.tar.gz z80uPC-2b59b9528106aced551c85b5f93b28befd1e4b96.zip | |
Merge remote-tracking branch 'origin/naopross' into atlas
Diffstat (limited to '')
| -rw-r--r-- | sw/z80/crt0.s | 103 | ||||
| -rw-r--r-- | sw/z80/crt0.s.old | 43 |
2 files changed, 103 insertions, 43 deletions
diff --git a/sw/z80/crt0.s b/sw/z80/crt0.s new file mode 100644 index 0000000..7701ca6 --- /dev/null +++ b/sw/z80/crt0.s @@ -0,0 +1,103 @@ +;-------------------------------------------------------------------------- +; crt0.s - Generic crt0.s for a Z80 +; +; Copyright (C) 2000, Michael Hope +; +; This library 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 2, or (at your option) any +; later version. +; +; This library 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. +; +; You should have received a copy of the GNU General Public License +; along with this library; see the file COPYING. If not, write to the +; Free Software Foundation, 51 Franklin Street, Fifth Floor, Boston, +; MA 02110-1301, USA. +; +; As a special exception, if you link this library with other files, +; some of which are compiled with SDCC, to produce an executable, +; this library does not by itself cause the resulting executable to +; be covered by the GNU General Public License. This exception does +; not however invalidate any other reasons why the executable file +; might be covered by the GNU General Public License. +;-------------------------------------------------------------------------- + + .module crt0 + .globl _main + + .area _HEADER (ABS) + ;; Reset vector + .org 0 + jp init + + .org 0x08 + reti + .org 0x10 + reti + .org 0x18 + reti + .org 0x20 + reti + .org 0x28 + reti + .org 0x30 + reti + .org 0x38 + reti + + .org 0x100 +init: + ;; Set stack pointer directly above top of memory. + ld sp,#0xFFFF + + ;; Initialise global variables + call gsinit + call _main + jp _exit + + ;; Ordering of segments for the linker. + .area _HOME + .area _CODE + .area _INITIALIZER + .area _GSINIT + .area _GSFINAL + + .area _DATA + .area _INITIALIZED + .area _BSEG + .area _BSS + .area _HEAP + + .area _CODE + +__clock:: + ld a,#2 + rst 0x08 + ret + +_exit:: + ;; Exit - special code to the emulator + ld a,#0 + rst 0x08 +1$: + halt + jr 1$ + + .area _GSINIT +gsinit:: + ; ld bc, #l__INITIALIZER + ld a, b + or a, c + jr Z, gsinit_next + ; ld de, #s__INITIALIZED + ; ld hl, #s__INITIALIZER + ldir +gsinit_next: + + .area _GSFINAL + ret + diff --git a/sw/z80/crt0.s.old b/sw/z80/crt0.s.old deleted file mode 100644 index f3bf8e8..0000000 --- a/sw/z80/crt0.s.old +++ /dev/null @@ -1,43 +0,0 @@ - .module crt0 - .globl _main - - .area _HEADER (ABS) -;; reset vector - .org 0x0000 - jp init - - .org 0x0100 - -init: -;; Stack at the top of memory. - ld sp,#0xffff - - ;; initialise global variables - call gsinit - call _main - jp _exit - - ;; Ordering of segments for the linker. - .area _HOME - .area _CODE - .area _GSINIT - .area _GSFINAL - - .area _DATA - .area _BSS - .area _HEAP - - .area _CODE -__clock:: - ret - -_exit:: - ret - - .area _GSINIT - -gsinit:: - -.area _GSFINAL - ret - |