1 @c Copyright 1991, 1992, 1993, 1994, 1995, 1997, 2001, 2004
2 @c Free Software Foundation, Inc.
3 @c This is part of the GAS manual.
4 @c For copying conditions, see the file as.texinfo.
7 @chapter Renesas / SuperH SH Dependent Features
11 * SH Options:: Options
13 * SH Floating Point:: Floating Point
14 * SH Directives:: SH Machine Directives
15 * SH Opcodes:: Opcodes
23 @code{@value{AS}} has following command-line options for the Renesas
24 (formerly Hitachi) / SuperH SH family.
34 Generate little endian code.
37 Generate big endian code.
40 Alter jump instructions for long displacements.
43 Align sections to 4 byte boundaries, not 16.
46 Enable sh-dsp insns, and disable sh3e / sh4 insns.
49 Specify the sh4 or sh4a instruction set.
51 Enable sh-dsp insns, and disable sh3e / sh4 insns.
53 Enable sh2e, sh3e, sh4, and sh4a insn sets.
55 Enable sh1, sh2, sh2e, sh3, sh3e, sh4, sh4a, and sh-dsp insn sets.
63 * SH-Chars:: Special Characters
64 * SH-Regs:: Register Names
65 * SH-Addressing:: Addressing Modes
69 @subsection Special Characters
71 @cindex line comment character, SH
72 @cindex SH line comment character
73 @samp{!} is the line comment character.
75 @cindex line separator, SH
76 @cindex statement separator, SH
77 @cindex SH line separator
78 You can use @samp{;} instead of a newline to separate statements.
80 @cindex symbol names, @samp{$} in
81 @cindex @code{$} in symbol names
82 Since @samp{$} has no special meaning, you may use it in symbol names.
85 @subsection Register Names
89 You can use the predefined symbols @samp{r0}, @samp{r1}, @samp{r2},
90 @samp{r3}, @samp{r4}, @samp{r5}, @samp{r6}, @samp{r7}, @samp{r8},
91 @samp{r9}, @samp{r10}, @samp{r11}, @samp{r12}, @samp{r13}, @samp{r14},
92 and @samp{r15} to refer to the SH registers.
94 The SH also has these control registers:
98 procedure register (holds return address)
105 high and low multiply accumulator registers
114 vector base register (for interrupt vectors)
118 @subsection Addressing Modes
120 @cindex addressing modes, SH
121 @cindex SH addressing modes
122 @code{@value{AS}} understands the following addressing modes for the SH.
123 @code{R@var{n}} in the following refers to any of the numbered
124 registers, but @emph{not} the control registers.
134 Register indirect with pre-decrement
137 Register indirect with post-increment
139 @item @@(@var{disp}, R@var{n})
140 Register indirect with displacement
142 @item @@(R0, R@var{n})
145 @item @@(@var{disp}, GBR)
152 @itemx @@(@var{disp}, PC)
153 PC relative address (for branch or for addressing memory). The
154 @code{@value{AS}} implementation allows you to use the simpler form
155 @var{addr} anywhere a PC relative address is called for; the alternate
156 form is supported for compatibility with other assemblers.
162 @node SH Floating Point
163 @section Floating Point
165 @cindex floating point, SH (@sc{ieee})
166 @cindex SH floating point (@sc{ieee})
167 SH2E, SH3E and SH4 groups have on-chip floating-point unit (FPU). Other
168 SH groups can use @code{.float} directive to generate @sc{ieee}
169 floating-point numbers.
171 SH2E and SH3E support single-precision floating point calculations as
172 well as entirely PCAPI compatible emulation of double-precision
173 floating point calculations. SH2E and SH3E instructions are a subset of
174 the floating point calculations conforming to the IEEE754 standard.
176 In addition to single-precision and double-precision floating-point
177 operation capability, the on-chip FPU of SH4 has a 128-bit graphic
178 engine that enables 32-bit floating-point data to be processed 128
179 bits at a time. It also supports 4 * 4 array operations and inner
180 product operations. Also, a superscalar architecture is employed that
181 enables simultaneous execution of two instructions (including FPU
182 instructions), providing performance of up to twice that of
183 conventional architectures at the same frequency.
186 @section SH Machine Directives
188 @cindex SH machine directives
189 @cindex machine directives, SH
190 @cindex @code{uaword} directive, SH
191 @cindex @code{ualong} directive, SH
196 @code{@value{AS}} will issue a warning when a misaligned @code{.word} or
197 @code{.long} directive is used. You may use @code{.uaword} or
198 @code{.ualong} to indicate that the value is intentionally misaligned.
204 @cindex SH opcode summary
205 @cindex opcode summary, SH
206 @cindex mnemonics, SH
207 @cindex instruction summary, SH
208 For detailed information on the SH machine instruction set, see
209 @cite{SH-Microcomputer User's Manual} (Renesas) or
210 @cite{SH-4 32-bit CPU Core Architecture} (SuperH) and
211 @cite{SuperH (SH) 64-Bit RISC Series} (SuperH).
213 @code{@value{AS}} implements all the standard SH opcodes. No additional
214 pseudo-instructions are needed on this family. Note, however, that
215 because @code{@value{AS}} supports a simpler form of PC-relative
216 addressing, you may simply write (for example)
223 where other assemblers might require an explicit displacement to
224 @code{bar} from the program counter:
227 mov.l @@(@var{disp}, PC)
231 @c this table, due to the multi-col faking and hardcoded order, looks silly
232 @c except in smallbook. See comments below "@set SMALL" near top of this file.
234 Here is a summary of SH opcodes:
239 Rn @r{a numbered register}
240 Rm @r{another numbered register}
241 #imm @r{immediate data}
242 disp @r{displacement}
243 disp8 @r{8-bit displacement}
244 disp12 @r{12-bit displacement}
246 add #imm,Rn lds.l @@Rn+,PR
247 add Rm,Rn mac.w @@Rm+,@@Rn+
248 addc Rm,Rn mov #imm,Rn
250 and #imm,R0 mov.b Rm,@@(R0,Rn)
251 and Rm,Rn mov.b Rm,@@-Rn
252 and.b #imm,@@(R0,GBR) mov.b Rm,@@Rn
253 bf disp8 mov.b @@(disp,Rm),R0
254 bra disp12 mov.b @@(disp,GBR),R0
255 bsr disp12 mov.b @@(R0,Rm),Rn
256 bt disp8 mov.b @@Rm+,Rn
258 clrt mov.b R0,@@(disp,Rm)
259 cmp/eq #imm,R0 mov.b R0,@@(disp,GBR)
260 cmp/eq Rm,Rn mov.l Rm,@@(disp,Rn)
261 cmp/ge Rm,Rn mov.l Rm,@@(R0,Rn)
262 cmp/gt Rm,Rn mov.l Rm,@@-Rn
263 cmp/hi Rm,Rn mov.l Rm,@@Rn
264 cmp/hs Rm,Rn mov.l @@(disp,Rn),Rm
265 cmp/pl Rn mov.l @@(disp,GBR),R0
266 cmp/pz Rn mov.l @@(disp,PC),Rn
267 cmp/str Rm,Rn mov.l @@(R0,Rm),Rn
268 div0s Rm,Rn mov.l @@Rm+,Rn
270 div1 Rm,Rn mov.l R0,@@(disp,GBR)
271 exts.b Rm,Rn mov.w Rm,@@(R0,Rn)
272 exts.w Rm,Rn mov.w Rm,@@-Rn
273 extu.b Rm,Rn mov.w Rm,@@Rn
274 extu.w Rm,Rn mov.w @@(disp,Rm),R0
275 jmp @@Rn mov.w @@(disp,GBR),R0
276 jsr @@Rn mov.w @@(disp,PC),Rn
277 ldc Rn,GBR mov.w @@(R0,Rm),Rn
278 ldc Rn,SR mov.w @@Rm+,Rn
279 ldc Rn,VBR mov.w @@Rm,Rn
280 ldc.l @@Rn+,GBR mov.w R0,@@(disp,Rm)
281 ldc.l @@Rn+,SR mov.w R0,@@(disp,GBR)
282 ldc.l @@Rn+,VBR mova @@(disp,PC),R0
284 lds Rn,MACL muls Rm,Rn
286 lds.l @@Rn+,MACH neg Rm,Rn
287 lds.l @@Rn+,MACL negc Rm,Rn
290 not Rm,Rn stc.l GBR,@@-Rn
291 or #imm,R0 stc.l SR,@@-Rn
292 or Rm,Rn stc.l VBR,@@-Rn
293 or.b #imm,@@(R0,GBR) sts MACH,Rn
296 rotl Rn sts.l MACH,@@-Rn
297 rotr Rn sts.l MACL,@@-Rn
308 shlr16 Rn tst.b #imm,@@(R0,GBR)
311 sleep xor.b #imm,@@(R0,GBR)
312 stc GBR,Rn xtrct Rm,Rn