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Differences

2.4.4 Changed assembler behavior

This section describes assembler behavior that is changed, deprecated, or obsolete.

Obsolete features are identified explicitly. Their use is faulted in ADS. Deprecated

features will be made obsolete in future releases. Their use is warned about in ADS.

New or changed assembler behavior

The following enhancements and changes are available in the assembler:

• The assembler provides new ATPCS command-line options similar to those for

the compilers.

• The default floating-point option is

-fpu softvfp

• A new default software stack checking option of

-swstna

is introduced for code

that is compatible with both software stack checking code and non software stack

checking code. This option makes explicit the behavior of the assembler. There is

no change to the default behavior.

• The assembler always outputs ELF object code. AOF is no longer supported.

• The assembler requires the dollar ($) and double quotation (") characters to be

doubled when they are included in string literals. SDT 2.50/2.51 required only a

single dollar or double quote character. For example, the following statement in

SDT:

copyloadsym SETS "|Load$$":CC:namecp:CC:"$$Base|"

must in ADS be:

copyloadsym SETS "|Load$$$$":CC:namecp:CC:"$$$$Base|"

• The new

-memaccess

option specifies the memory attributes of the target system.

•The

-list

option now accepts an argument of - to select stdout.

• DWARF2 stack-unwinding descriptions can be, and are recommended to be,

produced by the use of new directives.

• The assembler supports the new ARM9E and ARM10 instructions. Use one of

ARM9E, ARM10TDMI

™

, ARM1020T, or ARM10200

™

with the

-cpu

option.

• Support is provided for VFP in both scalar and vector mode.

• New directives

DCQ

and

DCQU

define a 64-bit integer value.

DCQ

is aligned to a 32-bit

boundary while

DCQU

is unaligned (byte boundary).

•The

DCFD

DCFDU

DCFS

and

DCFSU

directives now also accept a hex-constant form of

operand that specifies the IEEE bit-pattern of the value.

1 2 ... 73 74 75 76 77 78 79 80 81 82 83 ... 143 144

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