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Overview
| Comment: | Added sp handling to MOVE instruction, and rudimentary handling of JMP/JSR operands. |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA1: | 8fa71e963beaa8ac3ad59561e5c45bccd7ead48e |
| User & Date: | jos 2015-07-31 14:02:14 |
Context
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2015-07-31
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| 22:06 | Eliminated all the print-statements from 'opcodes.lua', Cleanup of the list-file output. check-in: 8a5653ef25 user: jos tags: trunk | |
| 14:02 | Added sp handling to MOVE instruction, and rudimentary handling of JMP/JSR operands. check-in: 8fa71e963b user: jos tags: trunk | |
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2015-07-30
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| 16:10 | A picture says more than 0x3e8 words :-) Added a drawing to illustrate the relations between the MegaProcessor's registers. check-in: cb73d9315a user: jos tags: trunk | |
Changes
Changes to asm.lua.
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function ProcessFile( inFileName )
local inFile = Check( io.open(inFileName,"r"),
"Can't open file " .. inFileName
);
local LineNr = 1;
for l in inFile:lines() do
LineNr = LineNr + 1;
ProcessLine( l );
end
end
function Fields( line )
if( line == "" or line:match("^%s*//") ) then return 0; end;
local retVal = 0;
local n, n1, label, instr, dst, src;
................................................................................
return retVal, label, instr, dst, src;
end
function ProcessLine( l )
local asm_instr;
local n,f1,f2,f3,f4 = Fields(l);
if( n == 0 ) then return; end
asm_instr = Directive[ string.lower(f2 or f3) ];
if( asm_instr ) then print( asm_instr() ); return; end
asm_instr = CPU_instr[ string.upper(f2 or f3) ];
-- if( asm_instr ) then asm_instr = asm_instr[2]; print( asm_instr[2](f2,f3,f4) ); end
if( asm_instr ) then
local b1, b2, b3 = asm_instr[2](f2,f3,f4);
if( b1 ) then b1 = string.format("%02x",b1); end
b1 = b1 or " ";
if( b2 ) then b2 = string.format("%02x",b2); end
b2 = b2 or " ";
if( b3 ) then b3 = string.format("%03x",b1); end
b3 = b3 or " ";
io.write( string.format( "%s %s %s", b1, b2, b3 ) );
else
io.write( (" "):rep(9) );
end
io.write( string.format("%d=%s - %s - %s - %s\n",n,f1,f2,f3,f4) );
end
-- Main line
--
if( not arg[1] ) then
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function ProcessFile( inFileName )
local inFile = Check( io.open(inFileName,"r"),
"Can't open file " .. inFileName
);
local LineNr = 1;
for l in inFile:lines() do
io.write( string.format("%04d ", LineNr) );
ProcessLine( l );
LineNr = LineNr + 1;
end
end
function Fields( line )
if( line == "" or line:match("^%s*//") ) then return 0; end;
local retVal = 0;
local n, n1, label, instr, dst, src;
................................................................................
return retVal, label, instr, dst, src;
end
function ProcessLine( l )
local asm_instr;
local n,f1,f2,f3,f4 = Fields(l);
if( l:sub(-1) == '\r' ) then l = l:sub(1,l:len()-1); end; -- chomp line.
if( n == 0 ) then print(l); return; end
asm_instr = Directive[ string.lower(f2 or f3) ];
if( asm_instr ) then print( asm_instr() ); return; end
asm_instr = CPU_instr[ string.upper(f2 or f3) ];
-- if( asm_instr ) then asm_instr = asm_instr[2]; print( asm_instr[2](f2,f3,f4) ); end
if( asm_instr ) then
local b1, b2, b3 = asm_instr[2](f2,f3,f4);
if( b1 ) then b1 = string.format("%02x",b1); end
b1 = b1 or " ";
if( b2 ) then b2 = string.format("%02x",b2); end
b2 = b2 or " ";
if( b3 ) then b3 = string.format("%02x",b3); end
b3 = b3 or " ";
io.write( string.format( "%s %s %s : ", b1, b2, b3 ) );
else
io.write( (" "):rep(9) .. ": " );
end
-- io.write( string.format("%d=%s - %s - %s - %s\n",n,f1,f2,f3,f4) );
print( l );
end
-- Main line
--
if( not arg[1] ) then
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Changes to opcodes.lua.
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function do_INV(f1, f2, f3)
local retVal = { [0]=0x30, 0x35, 0x3a, 0x3f };
return( retVal[ isReg(f2) ] );
end
function do_JMP(f1, f2, f3)
print( f1, f2, f3 );
end
function do_JSR(f1, f2, f3)
print( f1, f2, f3 );
end
function do_LD_B(f1, f2, f3)
print( f1, f2, f3 );
end
function do_LD_W(f1, f2, f3)
................................................................................
end
function do_LSR_WT(f1, f2, f3)
print( f1, f2, f3 );
end
function do_MOVE(f1, f2, f3)
local n1 = isReg(f2);
local n2 = isReg(f3);
if( n1 == n2 ) then
error("Cannot move register to itself");
end
return( 0x00 + n2*4 + n1 );
end
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function do_INV(f1, f2, f3)
local retVal = { [0]=0x30, 0x35, 0x3a, 0x3f };
return( retVal[ isReg(f2) ] );
end
function do_JMP(f1, f2, f3)
if( f2:sub(1,1) == '(' ) then
-- TODO check for (r0)
return 0xf2 ;
else
return 0xf3,0x00,0x00 ;
end
end
function do_JSR(f1, f2, f3)
if( f2:sub(1,1) == '(' ) then
-- TODO check for (r0)
return 0xce ;
else
return 0xcf,0x00,0x00 ;
end
end
function do_LD_B(f1, f2, f3)
print( f1, f2, f3 );
end
function do_LD_W(f1, f2, f3)
................................................................................
end
function do_LSR_WT(f1, f2, f3)
print( f1, f2, f3 );
end
function do_MOVE(f1, f2, f3)
if( f2:lower() == "sp" ) then
if( isReg(f3) == 0 )
then return 0xf1;
else error("SP only can be written from R0");
end
end
if( f3:lower() == "sp" ) then
if( isReg(f2) == 0 )
then return 0xf0;
else error("SP only can move into R0");
end
end
local n1 = isReg(f2);
local n2 = isReg(f3);
if( n1 == n2 ) then
error("Cannot move register to itself");
end
return( 0x00 + n2*4 + n1 );
end
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