as has no additional command-line options for the AMD
The macro syntax used on the AMD 29K is like that described in the AMD
29K Family Macro Assembler Specification. Normal
macros should still work.
`;' is the line comment character.
The character `?' is permitted in identifiers (but may not begin an identifier).
General-purpose registers are represented by predefined symbols of the
form `GRnnn' (for global registers) or `LRnnn'
(for local registers), where nnn represents a number between
127, written with no leading zeros. The leading
letters may be in either upper or lower case; for example, `gr13'
and `LR7' are both valid register names.
You may also refer to general-purpose registers by specifying the register number as the result of an expression (prefixed with `%%' to flag the expression as a register number):
---where expression must be an absolute expression evaluating to a
255. The range [0, 127] refers to
global registers, and the range [128, 255] to local registers.
as understands the following protected
special-purpose register names for the AMD 29K family:
vab chd pc0 ops chc pc1 cps rbp pc2 cfg tmc mmu cha tmr lru
These unprotected special-purpose register names are also recognized:
ipc alu fpe ipa bp inte ipb fc fps q cr exop
The AMD 29K family uses IEEE floating-point numbers.
.block size , fill
Warning: in other versions of the GNU assembler,
.fileis used for the directive called
.app-filein the AMD 29K support.
.use section name
.lit. With one of the first three section name options, `.use' is equivalent to the machine directive section name; the remaining case, `.use .lit', is the same as `.data 200'.
as implements all the standard AMD 29K opcodes. No
additional pseudo-instructions are needed on this family.
For information on the 29K machine instruction set, see Am29000 User's Manual, Advanced Micro Devices, Inc.
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