~ubuntu-branches/ubuntu/utopic/binutils-arm64-cross/utopic

Operand expression type qualifier is an optional field in the instruction operand, to determines the type of the expression field of an operand. The @code{@@} is required. CR16 architecture uses one of the following expression qualifiers:

@table @code

@item s

- @code{Specifies expression operand type as small}

@item m

- @code{Specifies expression operand type as medium}

@item l

- @code{Specifies expression operand type as large}

@item c

- @code{Specifies the CR16 Assembler generates a relocation entry for the operand, where pc has implied bit, the expression is adjusted accordingly. The linker uses the relocation entry to update the operand address at link time.}

@item got/GOT

- @code{Specifies the CR16 Assembler generates a relocation entry for the operand, offset from Global Offset Table. The linker uses this relocation entry to update the operand address at link time}

@item cgot/cGOT

- @code{Specifies the CompactRISC Assembler generates a relocation entry for the operand, where pc has implied bit, the expression is adjusted accordingly. The linker uses the relocation entry to update the operand address at link time.}

@end table

CR16 target operand qualifiers and its size (in bits):

@table @samp

@item Immediate Operand: s

4 bits.

@item Immediate Operand: m

16 bits, for movb and movw instructions.

@item Immediate Operand: m

20 bits, movd instructions.

@item Immediate Operand: l

32 bits.

@item Absolute Operand: s

Illegal specifier for this operand.

@item Absolute Operand: m

20 bits, movd instructions.

@item Displacement Operand: s

8 bits.

@item Displacement Operand: m

16 bits.

@item Displacement Operand: l

24 bits.

@end table

For example:

@example

1 @code{movw $_myfun@@c,r1}

This loads the address of _myfun, shifted right by 1, into r1.

2 @code{movd $_myfun@@c,(r2,r1)}

This loads the address of _myfun, shifted right by 1, into register-pair r2-r1.

3 @code{_myfun_ptr:}

@code{.long _myfun@@c}

@code{loadd _myfun_ptr, (r1,r0)}

@code{jal (r1,r0)}

This .long directive, the address of _myfunc, shifted right by 1 at link time.

4 @code{loadd _data1@@GOT(r12), (r1,r0)}

This loads the address of _data1, into global offset table (ie GOT) and its offset value from GOT loads into register-pair r2-r1.

5 @code{loadd _myfunc@@cGOT(r12), (r1,r0)}

This loads the address of _myfun, shifted right by 1, into global offset table (ie GOT) and its offset value from GOT loads into register-pair r1-r0.

100

@end example

101

102

@node CR16 Syntax

103

@section CR16 Syntax

104

@menu

105

* CR16-Chars:: Special Characters

106

@end menu

107

108

@node CR16-Chars

109

@subsection Special Characters

110

111

@cindex line comment character, CR16

112

@cindex CR16 line comment character

113

The presence of a @samp{#} on a line indicates the start of a comment

114

that extends to the end of the current line. If the @samp{#} appears

115

as the first character of a line, the whole line is treated as a

116

comment, but in this case the line can also be a logical line number

117

directive (@pxref{Comments}) or a preprocessor control command

118

(@pxref{Preprocessing}).

119

120

@cindex line separator, CR16

121

@cindex statement separator, CR16

122

@cindex CR16 line separator

123

The @samp{;} character can be used to separate statements on the same

124

line.

Older »