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https://git.sr.ht/~rabbits/uxn
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Progress on status flags
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parent
2782586f78
commit
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5 changed files with 40 additions and 7 deletions
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@ -36,8 +36,8 @@ $01 < pointer8 >
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## Mission
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## Mission
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- Carry flag?
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- Loop
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- Loop
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- Conditional example
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- Pointers/Literals
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- Pointers/Literals
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- Print word to stdout
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- Print word to stdout
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- Draw pixel to screen
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- Draw pixel to screen
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@ -51,7 +51,6 @@ $01 < pointer8 >
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- Implement 16 bits operations
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- Implement 16 bits operations
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- Jumps should be relative
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- Jumps should be relative
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- Catch overflow/underflow
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- Catch overflow/underflow
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- Implement literals like `[2]`, and `[ 2 3 ]`.
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- Audo-detect literals length.
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- Audo-detect literals length.
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- SDL Layer Emulator
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- SDL Layer Emulator
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- Build PPU
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- Build PPU
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2
build.sh
2
build.sh
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@ -14,5 +14,5 @@ cc -std=c89 -DDEBUG -Wall -Wno-unknown-pragmas -Wpedantic -Wshadow -Wextra -Werr
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cc -std=c89 -DDEBUG -Wall -Wno-unknown-pragmas -Wpedantic -Wshadow -Wextra -Werror=implicit-int -Werror=incompatible-pointer-types -Werror=int-conversion -Wvla -g -Og -fsanitize=address -fsanitize=undefined uxn.c -o uxn
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cc -std=c89 -DDEBUG -Wall -Wno-unknown-pragmas -Wpedantic -Wshadow -Wextra -Werror=implicit-int -Werror=incompatible-pointer-types -Werror=int-conversion -Wvla -g -Og -fsanitize=address -fsanitize=undefined uxn.c -o uxn
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# run
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# run
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./uxnasm examples/cond.usm boot.rom
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./uxnasm examples/core.usm boot.rom
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./uxn boot.rom
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./uxn boot.rom
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@ -1,3 +1,4 @@
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< core >
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< core >
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+12 -34
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+12 +34 ADD
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25
examples/subroutines.usm
Normal file
25
examples/subroutines.usm
Normal file
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@ -0,0 +1,25 @@
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< subroutines >
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:begin
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.addall JSR ADD ADD
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+06 EQU .isequal JSR
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BRK
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:add1
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+01 RTS
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:add2
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+02 RTS
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:add3
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+03 RTS
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:addall
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.add1 JSR
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.add2 JSR
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.add3 JSR
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RTS
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:isequal
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.addall JSR +ff
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RTS
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12
uxn.c
12
uxn.c
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@ -100,8 +100,8 @@ void op_ovr() { spush(cpu.stack[cpu.sptr - 2]); }
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void op_rot() { Uint8 c = spop(),b = spop(),a = spop(); spush(b); spush(c); spush(a); }
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void op_rot() { Uint8 c = spop(),b = spop(),a = spop(); spush(b); spush(c); spush(a); }
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void op_jmp() { cpu.mptr = spop(); }
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void op_jmp() { cpu.mptr = spop(); }
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void op_jsr() { rspush(cpu.mptr); cpu.mptr = spop(); }
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void op_jsr() { rspush(cpu.mptr); cpu.mptr = spop(); }
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void op_jmq() { if(getflag(FLAG_ZERO)) op_jmp(); }
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void op_jmq() { if(getflag(FLAG_ZERO)){ op_jmp(); } setflag(FLAG_ZERO,0); }
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void op_jsq() { if(getflag(FLAG_ZERO)) op_jsr(); }
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void op_jsq() { if(getflag(FLAG_ZERO)){ op_jsr(); } setflag(FLAG_ZERO,0); }
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void op_equ() { setflag(FLAG_ZERO, spop() == spop()); }
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void op_equ() { setflag(FLAG_ZERO, spop() == spop()); }
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void op_neq() { setflag(FLAG_ZERO, spop() != spop()); }
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void op_neq() { setflag(FLAG_ZERO, spop() != spop()); }
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void op_lth() { setflag(FLAG_ZERO, spop() < spop()); }
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void op_lth() { setflag(FLAG_ZERO, spop() < spop()); }
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@ -159,6 +159,8 @@ eval()
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}
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}
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if(instr < 24)
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if(instr < 24)
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(*ops[instr])();
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(*ops[instr])();
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if(instr > 0x10)
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setflag(FLAG_ZERO, 0);
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}
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}
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void
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void
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@ -169,6 +171,12 @@ run(void)
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eval(cpu);
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eval(cpu);
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/* debug */
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/* debug */
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printf("ended @ %d | ", cpu.counter);
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printf("ended @ %d | ", cpu.counter);
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printf("hf: %x zf: %x cf: %x tf: %x\n",
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getflag(FLAG_HALT),
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getflag(FLAG_ZERO),
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getflag(FLAG_CARRY),
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getflag(FLAG_TRAPS));
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printf("\n\n");
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for(i = 0; i < 4; i++)
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for(i = 0; i < 4; i++)
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printf("%d-", (cpu.status & (1 << i)) != 0);
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printf("%d-", (cpu.status & (1 << i)) != 0);
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printf("\n\n");
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printf("\n\n");
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