mirror of
https://github.com/cc65/cc65.git
synced 2024-11-19 06:31:31 +00:00
Added 6502 illegal instructions
git-svn-id: svn://svn.cc65.org/cc65/trunk@3022 b7a2c559-68d2-44c3-8de9-860c34a00d81
This commit is contained in:
parent
86960297c3
commit
19b9305f02
@ -309,6 +309,8 @@ The assembler accepts
|
||||
<itemize>
|
||||
<item>all valid 6502 mnemonics when in 6502 mode (the default or after the
|
||||
<tt><ref id=".P02" name=".P02"></tt> command was given).
|
||||
<item>all valid 6502 mnemonics plus a set of illegal instructions when in
|
||||
<ref id="6502X-mode" name="6502X mode">.
|
||||
<item>all valid 65SC02 mnemonics when in 65SC02 mode (after the
|
||||
<tt><ref id=".PSC02" name=".PSC02"></tt> command was given).
|
||||
<item>all valid 65C02 mnemonics when in 65C02 mode (after the
|
||||
@ -338,17 +340,36 @@ mnemonics:
|
||||
TSA is an alias for TSC
|
||||
</verb></tscreen>
|
||||
|
||||
Evaluation of banked expressions in 65816 mode differs slightly from the
|
||||
official syntax:
|
||||
|
||||
Instead of accepting a 24 bit address (something that is difficult for
|
||||
the assembler to determine and would have required one more special
|
||||
.import command), the bank and the absolute address in that bank are
|
||||
separated by a dot:
|
||||
|
||||
<tscreen><verb>
|
||||
jsl 3.$1234 ; Call subroutine at $1234 in bank 3
|
||||
</verb></tscreen>
|
||||
<sect1>6502X mode<label id="6502X-mode"><p>
|
||||
|
||||
6502X mode is an extension to the normal 6502 mode. In this mode, several
|
||||
mnemomics for illegal instructions of the NMOS 6502 CPUs are accepted. Since
|
||||
these instructions are illegal, there are no official mnemonics for them. The
|
||||
unofficial ones are taken from <htmlurl
|
||||
url="http://oxyron.net/graham/opcodes02.html"
|
||||
name="http://oxyron.net/graham/opcodes02.html">. Please note that only the
|
||||
ones marked as "stable" are supported. The following table uses information
|
||||
from the mentioned web page, for more information, see there.
|
||||
|
||||
<itemize>
|
||||
<item><tt>ALR: A:=(A and #{imm})*2;</tt>
|
||||
<item><tt>ANC: A:=A and #{imm};</tt> Generates opcode $0B.
|
||||
<item><tt>ARR: A:=(A and #{imm})/2;</tt>
|
||||
<item><tt>AXS: X:=A and X-#{imm};</tt>
|
||||
<item><tt>DCP: {adr}:={adr}-1; A-{adr};</tt>
|
||||
<item><tt>ISC: {adr}:={adr}+1; A:=A-{adr};</tt>
|
||||
<item><tt>LAS: A,X,S:={adr} and S;</tt>
|
||||
<item><tt>LAX: A,X:={adr};</tt>
|
||||
<item><tt>RLA: {adr}:={adr}rol; A:=A and {adr};</tt>
|
||||
<item><tt>RRA: {adr}:={adr}ror; A:=A adc {adr};</tt>
|
||||
<item><tt>SAX: {adr}:=A and X;</tt>
|
||||
<item><tt>SLO: {adr}:={adr}*2; A:=A or {adr};</tt>
|
||||
<item><tt>SRE: {adr}:={adr}/2; A:=A xor {adr};</tt>
|
||||
</itemize>
|
||||
|
||||
|
||||
|
||||
<sect1>Number format<p>
|
||||
|
||||
@ -2955,9 +2976,10 @@ Here's a list of all control commands and a description, what they do:
|
||||
Switch the CPU instruction set. The command is followed by a string that
|
||||
specifies the CPU. Possible values are those that can also be supplied to
|
||||
the <tt><ref id="option--cpu" name="--cpu"></tt> command line option,
|
||||
namely: 6502, 65SC02, 65C02, 65816 and sunplus. Please note that support
|
||||
for the sunplus CPU is not available in the freeware version, because the
|
||||
instruction set of the sunplus CPU is "proprietary and confidential".
|
||||
namely: 6502, 6502X, 65SC02, 65C02, 65816 and sunplus. Please note that
|
||||
support for the sunplus CPU is not available in the freeware version,
|
||||
because the instruction set of the sunplus CPU is "proprietary and
|
||||
confidential".
|
||||
|
||||
See: <tt><ref id=".CPU" name=".CPU"></tt>,
|
||||
<tt><ref id=".IFP02" name=".IFP02"></tt>,
|
||||
|
@ -147,7 +147,7 @@ static const struct {
|
||||
};
|
||||
|
||||
/* Instruction table for the 6502 with illegal instructions */
|
||||
#define INS_COUNT_6502X 57
|
||||
#define INS_COUNT_6502X 70
|
||||
static const struct {
|
||||
unsigned Count;
|
||||
InsDesc Ins[INS_COUNT_6502X];
|
||||
@ -155,8 +155,12 @@ static const struct {
|
||||
INS_COUNT_6502X,
|
||||
{
|
||||
{ "ADC", 0x080A26C, 0x60, 0, PutAll },
|
||||
{ "ALR", 0x0800000, 0x4B, 0, PutAll }, /* X */
|
||||
{ "ANC", 0x0800000, 0x0B, 0, PutAll }, /* X */
|
||||
{ "AND", 0x080A26C, 0x20, 0, PutAll },
|
||||
{ "ARR", 0x0800000, 0x6B, 0, PutAll }, /* X */
|
||||
{ "ASL", 0x000006e, 0x02, 1, PutAll },
|
||||
{ "AXS", 0x0800000, 0xCB, 0, PutAll }, /* X */
|
||||
{ "BCC", 0x0020000, 0x90, 0, PutPCRel8 },
|
||||
{ "BCS", 0x0020000, 0xb0, 0, PutPCRel8 },
|
||||
{ "BEQ", 0x0020000, 0xf0, 0, PutPCRel8 },
|
||||
@ -174,6 +178,7 @@ static const struct {
|
||||
{ "CMP", 0x080A26C, 0xc0, 0, PutAll },
|
||||
{ "CPX", 0x080000C, 0xe0, 1, PutAll },
|
||||
{ "CPY", 0x080000C, 0xc0, 1, PutAll },
|
||||
{ "DCP", 0x000A26C, 0xC3, 0, PutAll }, /* X */
|
||||
{ "DEC", 0x000006C, 0x00, 3, PutAll },
|
||||
{ "DEX", 0x0000001, 0xca, 0, PutAll },
|
||||
{ "DEY", 0x0000001, 0x88, 0, PutAll },
|
||||
@ -181,9 +186,12 @@ static const struct {
|
||||
{ "INC", 0x000006c, 0x00, 4, PutAll },
|
||||
{ "INX", 0x0000001, 0xe8, 0, PutAll },
|
||||
{ "INY", 0x0000001, 0xc8, 0, PutAll },
|
||||
{ "ISC", 0x000A26C, 0xE3, 0, PutAll }, /* X */
|
||||
{ "JAM", 0x0000001, 0x02, 0, PutAll }, /* X */
|
||||
{ "JMP", 0x0000808, 0x4c, 6, PutJMP },
|
||||
{ "JSR", 0x0000008, 0x20, 7, PutAll },
|
||||
{ "LAS", 0x0000200, 0xBB, 0, PutAll }, /* X */
|
||||
{ "LAX", 0x000A30C, 0xA3, 1, PutAll }, /* X */
|
||||
{ "LDA", 0x080A26C, 0xa0, 0, PutAll },
|
||||
{ "LDX", 0x080030C, 0xa2, 1, PutAll },
|
||||
{ "LDY", 0x080006C, 0xa0, 1, PutAll },
|
||||
@ -194,14 +202,19 @@ static const struct {
|
||||
{ "PHP", 0x0000001, 0x08, 0, PutAll },
|
||||
{ "PLA", 0x0000001, 0x68, 0, PutAll },
|
||||
{ "PLP", 0x0000001, 0x28, 0, PutAll },
|
||||
{ "RLA", 0x000A26C, 0x23, 0, PutAll }, /* X */
|
||||
{ "ROL", 0x000006F, 0x22, 1, PutAll },
|
||||
{ "ROR", 0x000006F, 0x62, 1, PutAll },
|
||||
{ "RRA", 0x000A26C, 0x63, 0, PutAll }, /* X */
|
||||
{ "RTI", 0x0000001, 0x40, 0, PutAll },
|
||||
{ "RTS", 0x0000001, 0x60, 0, PutAll },
|
||||
{ "SAX", 0x000810C, 0x83, 1, PutAll }, /* X */
|
||||
{ "SBC", 0x080A26C, 0xe0, 0, PutAll },
|
||||
{ "SEC", 0x0000001, 0x38, 0, PutAll },
|
||||
{ "SED", 0x0000001, 0xf8, 0, PutAll },
|
||||
{ "SEI", 0x0000001, 0x78, 0, PutAll },
|
||||
{ "SLO", 0x000A26C, 0x03, 0, PutAll }, /* X */
|
||||
{ "SRE", 0x000A26C, 0x43, 0, PutAll }, /* X */
|
||||
{ "STA", 0x000A26C, 0x80, 0, PutAll },
|
||||
{ "STX", 0x000010c, 0x82, 1, PutAll },
|
||||
{ "STY", 0x000002c, 0x80, 1, PutAll },
|
||||
@ -544,7 +557,7 @@ unsigned char EATab [9][AMI_COUNT] = {
|
||||
},
|
||||
{ /* Table 1 */
|
||||
0x08, 0x08, 0x04, 0x0C, 0x00, 0x14, 0x1C, 0x00,
|
||||
0x14, 0x1C, 0x00, 0x80, 0x00, 0x00, 0x00, 0x00,
|
||||
0x14, 0x1C, 0x00, 0x80, 0x00, 0x10, 0x00, 0x00,
|
||||
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
|
||||
0x00
|
||||
},
|
||||
|
Loading…
Reference in New Issue
Block a user