pyrite-dev/micro68
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update things

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This commit is contained in:
Nishi 2026-08-04 20:27:51 +09:00
commit eac07282a6
5 changed files with 83 additions and 20 deletions
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6
CMakeLists.txt
View file

@ -1,5 +1,5 @@
cmake_minimum_required(VERSION 3.11)
project(68ksbc)
project(micro68)
add_executable(m68kmake tools/m68kmake.c)
@ -8,8 +8,8 @@ list(REMOVE_ITEM SRCS ${CMAKE_CURRENT_SOURCE_DIR}/src/musashi/m68k_in.c ${CMAKE_
find_package(SDL2)
add_executable(68ksbc ${SRCS})
target_link_libraries(68ksbc PRIVATE m SDL2::SDL2)
add_executable(micro68 ${SRCS})
target_link_libraries(micro68 PRIVATE m SDL2::SDL2)
macro(runtime NAME)
add_custom_command(

2
runtime/crt0.s
View file

@ -66,11 +66,13 @@ vector_table:
init:
move.w #$2700,sr
; Copy DATA
lea _DATA_START,a0
lea _DATA_END,a1
lea _DATA_LOAD,a2
jsr copy
; Clear BSS
lea _BSS_START,a0
lea _BSS_END,a1
jsr clear

104
runtime/libc.s
View file

@ -1,26 +1,13 @@
section CODE
public _memset
;;
;; string.h
;;
; memset:
; 4(sp): dst
; 8(sp): value
; 12(sp): int
_memset:
move.l 4(sp),a0
move.l 8(sp),d0
move.l 12(sp),d1
.loop:
cmpi #0,d1
beq.s .done
move.b d0,(a0)+
sub #1,d1
bra.s .loop
.done:
rts
public _memcpy
public _memset
public _strcat
public _strcpy
public _strlen
; memcpy:
; 4(sp): dst
@ -29,21 +16,92 @@ _memset:
_memcpy:
move.l 4(sp),a0
move.l 8(sp),a1
move.l 12(sp),d1
move.l 12(sp),d0
.loop:
cmpi #0,d1
cmpi.l #0,d0
beq.s .done
move.b (a1)+,(a0)+
sub #1,d1
sub.l #1,d0
bra.s .loop
.done:
move.l 4(sp),d0
rts
; memset:
; 4(sp): dst
; 8(sp): value
; 12(sp): int
_memset:
move.l 4(sp),a0
move.l 8(sp),d0
move.l 12(sp),d0
.loop:
cmpi.l #0,d0
beq.s .done
move.b d0,(a0)+
sub.l #1,d0
bra.s .loop
.done:
move.l 4(sp),d0
rts
; strcat:
; 4(sp): dst
; 8(sp): src
_strcat:
move.l 4(sp),a0
move.l 8(sp),a1
.loop_incr:
move.b (a0),d0
cmpi.b #0,d0
beq.s .loop_copy
add.l #1,a0
bra.s .loop_incr
.loop_copy:
move.b (a1),d0
cmpi.b #0,d0
beq.s .done
move.b (a1)+,(a0)+
bra.s .loop_copy
.done:
move.b #0,(a0)
move.l 4(sp),d0
rts
; strcpy:
; 4(sp): dst
; 8(sp): src
_strcpy:
move.l 4(sp),a0
move.l 8(sp),a1
.loop:
move.b (a1),d0
cmpi.b #0,d0
beq.s .done
move.b (a1)+,(a0)+
bra.s .loop
.done:
move.b #0,(a0)
move.l 4(sp),d0
rts
; strlen:
; 4(sp): src
_strlen:
move.l 4(sp),a0
move.l #0,d0
.loop:
move.b (a0)+,d1
cmpi.b #0,d1
beq.s .done
add.l #1,d0
bra.s .loop
.done:
rts
;;
;; 32-bit div/mod: taken from vc.lib
;;
public __divu
public __divs
public __modu

7
runtime/string.h
View file

@ -3,7 +3,10 @@
#include <stddef.h>
void memset(void* dst, int data, int sz);
void memcpy(void* dst, void* src, int sz);
void* memcpy(void* dst, const void* src, int sz);
void* memset(void* dst, int data, int sz);
char* strcat(char* dst, const char* src);
int strlen(const char* src);
char* strcpy(char* dst, const char* src);
#endif

2
src/main.c
View file

@ -142,7 +142,7 @@ int main(int argc, char** argv){
ww = w * 4;
wh = h * 4;
if((window = SDL_CreateWindow("68K SBC (LCD)", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, ww, wh, 0)) == NULL){
if((window = SDL_CreateWindow("Micro68 (LCD)", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, ww, wh, 0)) == NULL){
fprintf(stderr, "SDL2 window creation failure\n");
st = 1;