mirror of
https://github.com/uffejakobsen/acme.git
synced 2024-11-29 19:50:12 +00:00
640373c54f
also prepared filespecs to be relative to current file in next version. git-svn-id: https://svn.code.sf.net/p/acme-crossass/code-0/trunk@357 4df02467-bbd4-4a76-a152-e7ce94205b78
201 lines
8.4 KiB
Plaintext
201 lines
8.4 KiB
Plaintext
|
|
|
|
ACME
|
|
|
|
...the ACME Crossassembler for Multiple Environments
|
|
|
|
--- upgrading from earlier versions ---
|
|
|
|
|
|
If you haven't used ACME before, you don't need to read this text.
|
|
|
|
|
|
|
|
----------------------------------------------------------------------
|
|
Upgrading from earlier releases to ACME release 0.97
|
|
----------------------------------------------------------------------
|
|
|
|
a) Single quotes vs. double quotes:
|
|
Since "anything in double quotes" is now considered to be a string,
|
|
problems can arise when trying to do a calculation with a character
|
|
code. Here are some examples:
|
|
lda #' ' ; loads 32 like before (ASCII code of space)
|
|
lda #' ' + 1 ; loads 33 like before (32 plus one)
|
|
lda #" " ; loads 32 like before (ASCII code of space)
|
|
lda #" " + 1 ; used to load 33, now fails with error!
|
|
The third example still works, because 1-char-strings are treated
|
|
just like single characters when returned by the expression parser as
|
|
an argument for a mnemonic.
|
|
However, the fourth example now fails because the expression parser
|
|
tries to add a string to an integer, which is an undefined operation.
|
|
Some examples for a related problem:
|
|
a = ' ' ; a is 32 (ASCII code of space)
|
|
b = ' ' + 1 ; b is 33 (32 plus one)
|
|
c = "!" ; c used to be 33, now it's a 1-char string
|
|
d = "!" + "!" ; d used to be 66, now it's a 2-char string
|
|
If you do not get any errors when compiling your old sources, you do
|
|
not need to worry about this problem.
|
|
If you _do_ get errors, just use single quotes instead of double
|
|
quotes. If you had to use double quotes because the quoted character
|
|
itself is a single quote, write '\'' instead (backslash escaping, see
|
|
below).
|
|
|
|
b) Backslash escaping:
|
|
Backslashes in single or double quotes are now used as escape
|
|
characters. You need to replace any backslash in older sources with a
|
|
sequence of two backslashes, so "some\string" becomes "some\\string",
|
|
and a single character '\' becomes '\\'.
|
|
If you have used backslashes as directory separators in path names (in
|
|
Windows/DOS environments), these also need changing - but instead of
|
|
using a double backslash, just use a single forward slash ('/')
|
|
instead. This has the added benefit of making the sources platform-
|
|
independent (*and* it's compatible to older ACME releases as well).
|
|
|
|
c) Character values are now unsigned:
|
|
When parsing a character in single quotes, ACME returns its character
|
|
code, according to the chosen encoding (raw/petscii/screencode). If
|
|
this resulted in a byte with its most significant bit set, the actual
|
|
number was architecture-dependent. Here's an example:
|
|
!ct pet ; choose PetSCII encoding
|
|
x = 'A' ; PetSCII 'A' is 0xc1, so MSB is set
|
|
Now x was either -63 or +193, depending on the host cpu architecture.
|
|
Since release 0.97, this example will give 193 on all architectures.
|
|
In most cases, this is not a problem, because the actual bit pattern
|
|
of the lower eight bits is the same. But if you have written any code
|
|
where the numerical value of a PetSCII character is used for
|
|
computations _in_the_source_code_, please check those computations.
|
|
|
|
Use the "--dialect 0.95.2" CLI switch to get the old behavior
|
|
concerning a) double quotes and b) backslashes. There is no way to get
|
|
the old behavior concerning c) character values, because, as explained
|
|
above, the old behavior was architecture-dependent, which is a bad
|
|
idea(tm).
|
|
|
|
|
|
|
|
----------------------------------------------------------------------
|
|
Upgrading from earlier releases to ACME release 0.95.2
|
|
----------------------------------------------------------------------
|
|
|
|
In 6510 mode, ACME now outputs 0x0b instead of 0x2b when assembling
|
|
the undocumented ("illegal") ANC #imm8 instruction. Both opcodes do
|
|
the same thing, this was only changed because all other mnemonics use
|
|
the lowest-numbered possible opcode as well.
|
|
Use the "--dialect 0.94.12" CLI switch to get the old behavior.
|
|
|
|
|
|
|
|
----------------------------------------------------------------------
|
|
Upgrading from earlier releases to ACME release 0.94.12
|
|
----------------------------------------------------------------------
|
|
|
|
The pseudo opcode "!for" has a new syntax. The old syntax still works,
|
|
but gives a warning.
|
|
You can use the "--dialect 0.94.8" CLI switch to get the old behavior.
|
|
|
|
|
|
----------------------------------------------------------------------
|
|
Upgrading from earlier releases to ACME release 0.94.8
|
|
----------------------------------------------------------------------
|
|
|
|
The pseudo opcodes "!cbm", "!subzone" and "!realpc" no longer give
|
|
warnings, but have now been disabled.
|
|
You can use the "--dialect 0.94.6" CLI switch to get the old behavior.
|
|
|
|
|
|
|
|
----------------------------------------------------------------------
|
|
Upgrading from earlier releases to ACME release 0.94.6
|
|
----------------------------------------------------------------------
|
|
|
|
The "to-the-power-of" operator ('^') is now right-associative, so
|
|
b^c^d will now give b^(c^d) instead of (b^c)^d
|
|
If you have never used the operator in this way, you don't need to
|
|
worry about it.
|
|
You can use the "--dialect 0.86" CLI switch to get the old behavior.
|
|
|
|
|
|
|
|
----------------------------------------------------------------------
|
|
Upgrading from earlier releases to ACME release 0.89
|
|
----------------------------------------------------------------------
|
|
|
|
The "logical shift right" operator has been changed. Note: This is
|
|
about ACME's expression parser and has nothing to do with the 6502
|
|
mnemonic called "LSR".
|
|
Older versions were supposed to work like this:
|
|
a = b >> c ; alias "LSR", do a logical shift right
|
|
But what they actually did depended on the compiler that was used to
|
|
create the ACME binary: many binaries did an "arithmetic shift right"
|
|
instead. This has now been fixed and changed to:
|
|
a = b >> c ; alias "ASR", do an arithmetic shift right
|
|
a = b >>> c ; alias "LSR", do a logical shift right
|
|
If you have never applied the old ">>"/"LSR" operator to a negative
|
|
value, you do not need to worry about this. If you have, please check
|
|
what you expected to happen in those instances (arithmetic or logical
|
|
shift) and update your source codes accordingly (use either ">>"/"ASR"
|
|
or ">>>"/"LSR").
|
|
Forcing the old behavior via the "--dialect" switch is not possible,
|
|
because as explained above, the old behavior was compiler-dependent
|
|
anyway.
|
|
|
|
|
|
|
|
----------------------------------------------------------------------
|
|
Upgrading from earlier releases to ACME release 0.07
|
|
----------------------------------------------------------------------
|
|
|
|
Re-defining the program counter via "* = NEW_VALUE" no longer starts
|
|
offset assembly. Instead, ACME will change its pointer into the output
|
|
buffer to the given value, so you can write your code in distinct
|
|
segments. These segments can be given in any order. After assembly,
|
|
ACME stores everything from the lowest address used to the highest
|
|
address used. Have a look at "AllPOs.txt" for an example on how to use
|
|
this facility.
|
|
|
|
Offset assembly is now done using a new pseudo opcode called
|
|
"!pseudopc". Have a look at "AllPOs.txt" for further information on
|
|
its syntax and usage.
|
|
|
|
The pseudo opcode "!end" has been removed. Use "!eof" instead.
|
|
|
|
The mnemonic BIT can no longer be assembled without any argument. If
|
|
you want to insert the opcode only to mask the next instruction, use
|
|
!src <6502/std.a>
|
|
to get the definitions for these two macros:
|
|
+bit8 ; output $24 to mask following 1-byte instruction
|
|
+bit16 ; output $2c to mask following 2-byte instruction
|
|
|
|
When using the 65816 cpu, ACME now uses the correct argument order for
|
|
the MVN and MVP mnemonics, which is:
|
|
mnemonic source_bank, destination_bank
|
|
|
|
Using leading zeroes in hexadecimal or binary values makes ACME use
|
|
bigger addressing modes than needed. This has now been extended to
|
|
symbols as well:
|
|
label2 = $00fa
|
|
lda label2
|
|
will be assembled to:
|
|
ad fa 00 lda $00fa
|
|
|
|
Forcing the old behavior via the "--dialect" switch is not supported.
|
|
|
|
|
|
|
|
----------------------------------------------------------------------
|
|
Upgrading from earlier releases to ACME release 0.04 beta
|
|
----------------------------------------------------------------------
|
|
|
|
The pseudo opcode "!module" has been removed. Use "!zone" instead.
|
|
Forcing the old behavior via the "--dialect" switch is not supported.
|
|
|
|
|
|
|
|
----------------------------------------------------------------------
|
|
Upgrading from earlier releases to ACME release 0.03 beta
|
|
----------------------------------------------------------------------
|
|
|
|
It is no longer possible to have more than one label in a single line.
|
|
Forcing the old behavior via the "--dialect" switch is not supported.
|
|
|