1 @c Copyright (C) 2001, 2002 Free Software Foundation, Inc.
2 @c This is part of the GAS manual.
3 @c For copying conditions, see the file as.texinfo.
6 @chapter Hitachi SH64 Dependent Features
10 * SH64 Options:: Options
11 * SH64 Syntax:: Syntax
12 * SH64 Directives:: SH64 Machine Directives
13 * SH64 Opcodes:: Opcodes
23 @cindex SH64 ISA options
24 @cindex ISA options, SH64
25 @item -isa=shmedia | -isa=shcompact
26 Specify the default instruction set. @code{SHmedia} specifies the
27 32-bit opcodes, and @code{SHcompact} specifies the 16-bit opcodes
28 compatible with previous SH families. The default depends on the ABI
29 selected; the default for the 64-bit ABI is SHmedia, and the default for
30 the 32-bit ABI is SHcompact. If neither the ABI nor the ISA is
31 specified, the default is 32-bit SHcompact.
33 Note that the @code{.mode} pseudo-op is not permitted if the ISA is not
34 specified on the command line.
36 @cindex SH64 ABI options
37 @cindex ABI options, SH64
38 @item -abi=32 | -abi=64
39 Specify the default ABI. If the ISA is specified and the ABI is not,
40 the default ABI depends on the ISA, with SHmedia defaulting to 64-bit
41 and SHcompact defaulting to 32-bit.
43 Note that the @code{.abi} pseudo-op is not permitted if the ABI is not
44 specified on the command line. When the ABI is specified on the command
45 line, any @code{.abi} pseudo-ops in the source must match it.
47 @item -shcompact-const-crange
48 Emit code-range descriptors for constants in SHcompact code sections.
51 Disallow SHmedia code in the same section as constants and SHcompact
55 Do not expand MOVI, PT, PTA or PTB instructions.
58 With -abi=64, expand PT, PTA and PTB instructions to 32 bits only.
66 * SH64-Chars:: Special Characters
67 * SH64-Regs:: Register Names
68 * SH64-Addressing:: Addressing Modes
72 @subsection Special Characters
74 @cindex line comment character, SH64
75 @cindex SH64 line comment character
76 @samp{!} is the line comment character.
78 @cindex line separator, SH64
79 @cindex statement separator, SH64
80 @cindex SH64 line separator
81 You can use @samp{;} instead of a newline to separate statements.
83 @cindex symbol names, @samp{$} in
84 @cindex @code{$} in symbol names
85 Since @samp{$} has no special meaning, you may use it in symbol names.
88 @subsection Register Names
90 @cindex SH64 registers
91 @cindex registers, SH64
92 You can use the predefined symbols @samp{r0} through @samp{r63} to refer
93 to the SH64 general registers, @samp{cr0} through @code{cr63} for
94 control registers, @samp{tr0} through @samp{tr7} for target address
95 registers, @samp{fr0} through @samp{fr63} for single-precision floating
96 point registers, @samp{dr0} through @samp{dr62} (even numbered registers
97 only) for double-precision floating point registers, @samp{fv0} through
98 @samp{fv60} (multiples of four only) for single-precision floating point
99 vectors, @samp{fp0} through @samp{fp62} (even numbered registers only)
100 for single-precision floating point pairs, @samp{mtrx0} through
101 @samp{mtrx48} (multiples of 16 only) for 4x4 matrices of
102 single-precision floating point registers, @samp{pc} for the program
103 counter, and @samp{fpscr} for the floating point status and control
106 You can also refer to the control registers by the mnemonics @samp{sr},
107 @samp{ssr}, @samp{pssr}, @samp{intevt}, @samp{expevt}, @samp{pexpevt},
108 @samp{tra}, @samp{spc}, @samp{pspc}, @samp{resvec}, @samp{vbr},
109 @samp{tea}, @samp{dcr}, @samp{kcr0}, @samp{kcr1}, @samp{ctc}, and
112 @node SH64-Addressing
113 @subsection Addressing Modes
115 @cindex addressing modes, SH64
116 @cindex SH64 addressing modes
118 SH64 operands consist of either a register or immediate value. The
119 immediate value can be a constant or label reference (or portion of a
120 label reference), as in this example:
125 movi (function >> 16) & 65535,r0
126 shori function & 65535, r0
130 @cindex datalabel, SH64
131 Instruction label references can reference labels in either SHmedia or
132 SHcompact. To differentiate between the two, labels in SHmedia sections
133 will always have the least significant bit set (i.e. they will be odd),
134 which SHcompact labels will have the least significant bit reset
135 (i.e. they will be even). If you need to reference the actual address
136 of a label, you can use the @code{datalabel} modifier, as in this
141 .long datalabel function
144 In that example, the first longword may or may not have the least
145 significant bit set depending on whether the label is an SHmedia label
146 or an SHcompact label. The second longword will be the actual address
147 of the label, regardless of what type of label it is.
149 @node SH64 Directives
150 @section SH64 Machine Directives
152 In addition to the SH directives, the SH64 provides the following
155 @cindex SH64 machine directives
156 @cindex machine directives, SH64
160 @item .mode [shmedia|shcompact]
161 @itemx .isa [shmedia|shcompact]
162 Specify the ISA for the following instructions (the two directives are
163 equivalent). Note that programs such as @code{objdump} rely on symbolic
164 labels to determine when such mode switches occur (by checking the least
165 significant bit of the label's address), so such mode/isa changes should
166 always be followed by a label (in practice, this is true anyway). Note
167 that you cannot use these directives if you didn't specify an ISA on the
171 Specify the ABI for the following instructions. Note that you cannot use
172 this directive unless you specified an ABI on the command line, and the
173 ABIs specified must match.
176 Like .uaword and .ualong, this allows you to specify an intenionally
177 unaligned quadword (64 bit word).
184 @cindex SH64 opcode summary
185 @cindex opcode summary, SH64
186 @cindex mnemonics, SH64
187 @cindex instruction summary, SH64
188 For detailed information on the SH64 machine instruction set, see
189 @cite{SuperH 64 bit RISC Series Architecture Manual} (SuperH, Inc.).
191 @code{@value{AS}} implements all the standard SH64 opcodes. In
192 addition, the following pseudo-opcodes may be expanded into one or more
198 If the value doesn't fit into a standard @code{movi} opcode,
199 @code{@value{AS}} will replace the @code{movi} with a sequence of
200 @code{movi} and @code{shori} opcodes.
203 This expands to a sequence of @code{movi} and @code{shori} opcode,
204 followed by a @code{ptrel} opcode, or to a @code{pta} or @code{ptb}
205 opcode, depending on the label referenced.