1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
|
@c Copyright (C) 2011-2017 Free Software Foundation, Inc.
@c This is part of the GAS manual.
@c For copying conditions, see the file as.texinfo.
@ifset GENERIC
@page
@node RL78-Dependent
@chapter RL78 Dependent Features
@end ifset
@ifclear GENERIC
@node Machine Dependencies
@chapter RL78 Dependent Features
@end ifclear
@cindex RL78 support
@menu
* RL78-Opts:: RL78 Assembler Command Line Options
* RL78-Modifiers:: Symbolic Operand Modifiers
* RL78-Directives:: Assembler Directives
* RL78-Syntax:: Syntax
@end menu
@node RL78-Opts
@section RL78 Options
@cindex options, RL78
@cindex RL78 options
@table @code
@item relax
Enable support for link-time relaxation.
@item norelax
Disable support for link-time relaxation (default).
@item mg10
Mark the generated binary as targeting the G10 variant of the RL78
architecture.
@item mg13
Mark the generated binary as targeting the G13 variant of the RL78
architecture.
@item mg14
@itemx mrl78
Mark the generated binary as targeting the G14 variant of the RL78
architecture. This is the default.
@item m32bit-doubles
Mark the generated binary as one that uses 32-bits to hold the
@code{double} floating point type. This is the default.
@item m64bit-doubles
Mark the generated binary as one that uses 64-bits to hold the
@code{double} floating point type.
@end table
@node RL78-Modifiers
@section Symbolic Operand Modifiers
@cindex RL78 modifiers
@cindex syntax, RL78
The RL78 has three modifiers that adjust the relocations used by the
linker:
@table @code
@item %lo16()
When loading a 20-bit (or wider) address into registers, this modifier
selects the 16 least significant bits.
@smallexample
movw ax,#%lo16(_sym)
@end smallexample
@item %hi16()
When loading a 20-bit (or wider) address into registers, this modifier
selects the 16 most significant bits.
@smallexample
movw ax,#%hi16(_sym)
@end smallexample
@item %hi8()
When loading a 20-bit (or wider) address into registers, this modifier
selects the 8 bits that would go into CS or ES (i.e. bits 23..16).
@smallexample
mov es, #%hi8(_sym)
@end smallexample
@end table
@node RL78-Directives
@section Assembler Directives
@cindex assembler directives, RL78
@cindex RL78 assembler directives
In addition to the common directives, the RL78 adds these:
@table @code
@item .double
Output a constant in ``double'' format, which is either a 32-bit
or a 64-bit floating point value, depending upon the setting of the
@option{-m32bit-doubles}|@option{-m64bit-doubles} command line
option.
@item .bss
Select the BSS section.
@item .3byte
Output a constant value in a three byte format.
@item .int
@itemx .word
Output a constant value in a four byte format.
@end table
@node RL78-Syntax
@section Syntax for the RL78
@menu
* RL78-Chars:: Special Characters
@end menu
@node RL78-Chars
@subsection Special Characters
@cindex line comment character, RL78
@cindex RL78 line comment character
The presence of a @samp{;} appearing anywhere on a line indicates the
start of a comment that extends to the end of that line.
If a @samp{#} appears as the first character of a line then the whole
line is treated as a comment, but in this case the line can also be a
logical line number directive (@pxref{Comments}) or a preprocessor
control command (@pxref{Preprocessing}).
@cindex line separator, RL78
@cindex statement separator, RL78
@cindex RL78 line separator
The @samp{|} character can be used to separate statements on the same
line.
|
GitWeb