Commit | Line | Data |
---|---|---|
6f2750fe | 1 | @c Copyright (C) 1991-2016 Free Software Foundation, Inc. |
252b5132 RH |
2 | @c This is part of the GAS manual. |
3 | @c For copying conditions, see the file as.texinfo. | |
4 | @ifset GENERIC | |
5 | @page | |
6 | @node Sparc-Dependent | |
7 | @chapter SPARC Dependent Features | |
8 | @end ifset | |
9 | @ifclear GENERIC | |
10 | @node Machine Dependencies | |
11 | @chapter SPARC Dependent Features | |
12 | @end ifclear | |
13 | ||
14 | @cindex SPARC support | |
15 | @menu | |
16 | * Sparc-Opts:: Options | |
17 | * Sparc-Aligned-Data:: Option to enforce aligned data | |
c15295d5 | 18 | * Sparc-Syntax:: Syntax |
252b5132 RH |
19 | * Sparc-Float:: Floating Point |
20 | * Sparc-Directives:: Sparc Machine Directives | |
21 | @end menu | |
22 | ||
23 | @node Sparc-Opts | |
24 | @section Options | |
25 | ||
26 | @cindex options for SPARC | |
27 | @cindex SPARC options | |
28 | @cindex architectures, SPARC | |
29 | @cindex SPARC architectures | |
f04d18b7 | 30 | The SPARC chip family includes several successive versions, using the same |
252b5132 | 31 | core instruction set, but including a few additional instructions at |
f04d18b7 | 32 | each version. There are exceptions to this however. For details on what |
252b5132 RH |
33 | instructions each variant supports, please see the chip's architecture |
34 | reference manual. | |
35 | ||
36 | By default, @code{@value{AS}} assumes the core instruction set (SPARC | |
37 | v6), but ``bumps'' the architecture level as needed: it switches to | |
38 | successively higher architectures as it encounters instructions that | |
39 | only exist in the higher levels. | |
40 | ||
41 | If not configured for SPARC v9 (@code{sparc64-*-*}) GAS will not bump | |
f04d18b7 | 42 | past sparclite by default, an option must be passed to enable the |
252b5132 RH |
43 | v9 instructions. |
44 | ||
45 | GAS treats sparclite as being compatible with v8, unless an architecture | |
46 | is explicitly requested. SPARC v9 is always incompatible with sparclite. | |
47 | ||
48 | @c The order here is the same as the order of enum sparc_opcode_arch_val | |
49 | @c to give the user a sense of the order of the "bumping". | |
50 | ||
51 | @table @code | |
52 | @kindex -Av6 | |
4bafe00e | 53 | @kindex -Av7 |
252b5132 | 54 | @kindex -Av8 |
d6787ef9 | 55 | @kindex -Aleon |
252b5132 RH |
56 | @kindex -Asparclet |
57 | @kindex -Asparclite | |
58 | @kindex -Av9 | |
59 | @kindex -Av9a | |
4bafe00e DM |
60 | @kindex -Av9b |
61 | @kindex -Av9c | |
62 | @kindex -Av9d | |
3d68f91c | 63 | @kindex -Av9e |
4bafe00e | 64 | @kindex -Av9v |
3d68f91c | 65 | @kindex -Av9m |
4bafe00e DM |
66 | @kindex -Asparc |
67 | @kindex -Asparcvis | |
68 | @kindex -Asparcvis2 | |
69 | @kindex -Asparcfmaf | |
70 | @kindex -Asparcima | |
71 | @kindex -Asparcvis3 | |
72 | @kindex -Asparcvis3r | |
d6787ef9 | 73 | @item -Av6 | -Av7 | -Av8 | -Aleon | -Asparclet | -Asparclite |
46a2d504 | 74 | @itemx -Av8plus | -Av8plusa | -Av8plusb | -Av8plusc | -Av8plusd | -Av8plusv | -Av8plusm |
3d68f91c | 75 | @itemx -Av9 | -Av9a | -Av9b | -Av9c | -Av9d | -Av9e | -Av9v | -Av9m |
4bafe00e | 76 | @itemx -Asparc | -Asparcvis | -Asparcvis2 | -Asparcfmaf | -Asparcima |
46a2d504 | 77 | @itemx -Asparcvis3 | -Asparcvis3r | -Asparc5 |
252b5132 RH |
78 | Use one of the @samp{-A} options to select one of the SPARC |
79 | architectures explicitly. If you select an architecture explicitly, | |
80 | @code{@value{AS}} reports a fatal error if it encounters an instruction | |
81 | or feature requiring an incompatible or higher level. | |
82 | ||
4bafe00e DM |
83 | @samp{-Av8plus}, @samp{-Av8plusa}, @samp{-Av8plusb}, @samp{-Av8plusc}, |
84 | @samp{-Av8plusd}, and @samp{-Av8plusv} select a 32 bit environment. | |
252b5132 | 85 | |
3d68f91c JM |
86 | @samp{-Av9}, @samp{-Av9a}, @samp{-Av9b}, @samp{-Av9c}, @samp{-Av9d}, |
87 | @samp{-Av9e}, @samp{-Av9v} and @samp{-Av9m} select a 64 bit | |
88 | environment and are not available unless GAS is explicitly configured | |
89 | with 64 bit environment support. | |
252b5132 RH |
90 | |
91 | @samp{-Av8plusa} and @samp{-Av9a} enable the SPARC V9 instruction set with | |
4bafe00e | 92 | UltraSPARC VIS 1.0 extensions. |
252b5132 | 93 | |
4bafe00e DM |
94 | @samp{-Av8plusb} and @samp{-Av9b} enable the UltraSPARC VIS 2.0 instructions, |
95 | as well as the instructions enabled by @samp{-Av8plusa} and @samp{-Av9a}. | |
96 | ||
97 | @samp{-Av8plusc} and @samp{-Av9c} enable the UltraSPARC Niagara instructions, | |
98 | as well as the instructions enabled by @samp{-Av8plusb} and @samp{-Av9b}. | |
99 | ||
100 | @samp{-Av8plusd} and @samp{-Av9d} enable the floating point fused | |
101 | multiply-add, VIS 3.0, and HPC extension instructions, as well as the | |
102 | instructions enabled by @samp{-Av8plusc} and @samp{-Av9c}. | |
103 | ||
3d68f91c JM |
104 | @samp{-Av8pluse} and @samp{-Av9e} enable the cryptographic |
105 | instructions, as well as the instructions enabled by @samp{-Av8plusd} | |
106 | and @samp{-Av9d}. | |
107 | ||
108 | @samp{-Av8plusv} and @samp{-Av9v} enable floating point unfused | |
109 | multiply-add, and integer multiply-add, as well as the instructions | |
110 | enabled by @samp{-Av8pluse} and @samp{-Av9e}. | |
111 | ||
112 | @samp{-Av8plusm} and @samp{-Av9m} enable the VIS 4.0, subtract extended, | |
113 | xmpmul, xmontmul and xmontsqr instructions, as well as the instructions | |
114 | enabled by @samp{-Av8plusv} and @samp{-Av9v}. | |
4bafe00e DM |
115 | |
116 | @samp{-Asparc} specifies a v9 environment. It is equivalent to | |
117 | @samp{-Av9} if the word size is 64-bit, and @samp{-Av8plus} otherwise. | |
118 | ||
119 | @samp{-Asparcvis} specifies a v9a environment. It is equivalent to | |
120 | @samp{-Av9a} if the word size is 64-bit, and @samp{-Av8plusa} otherwise. | |
121 | ||
122 | @samp{-Asparcvis2} specifies a v9b environment. It is equivalent to | |
123 | @samp{-Av9b} if the word size is 64-bit, and @samp{-Av8plusb} otherwise. | |
124 | ||
125 | @samp{-Asparcfmaf} specifies a v9b environment with the floating point | |
126 | fused multiply-add instructions enabled. | |
127 | ||
128 | @samp{-Asparcima} specifies a v9b environment with the integer | |
129 | multiply-add instructions enabled. | |
130 | ||
131 | @samp{-Asparcvis3} specifies a v9b environment with the VIS 3.0, | |
132 | HPC , and floating point fused multiply-add instructions enabled. | |
133 | ||
3d68f91c JM |
134 | @samp{-Asparcvis3r} specifies a v9b environment with the VIS 3.0, HPC, |
135 | and floating point unfused multiply-add instructions enabled. | |
136 | ||
137 | @samp{-Asparc5} is equivalent to @samp{-Av9m}. | |
4bafe00e DM |
138 | |
139 | @item -xarch=v8plus | -xarch=v8plusa | -xarch=v8plusb | -xarch=v8plusc | |
46a2d504 | 140 | @itemx -xarch=v8plusd | -xarch=v8plusv | -xarch=v8plusm | -xarch=v9 | -xarch=v9a |
3d68f91c | 141 | @itemx -xarch=v9b | -xarch=v9c | -xarch=v9d | -xarch=v9e | -xarch=v9v | -xarch=v9m |
4bafe00e DM |
142 | @itemx -xarch=sparc | -xarch=sparcvis | -xarch=sparcvis2 |
143 | @itemx -xarch=sparcfmaf | -xarch=sparcima | -xarch=sparcvis3 | |
3d68f91c | 144 | @itemx -xarch=sparcvis3r | -xarch=sparc5 |
f04d18b7 | 145 | For compatibility with the SunOS v9 assembler. These options are |
4bafe00e | 146 | equivalent to -Av8plus, -Av8plusa, -Av8plusb, -Av8plusc, -Av8plusd, |
46a2d504 | 147 | -Av8plusv, -Av8plusm, -Av9, -Av9a, -Av9b, -Av9c, -Av9d, -Av9e, -Av9v, -Av9m, |
3d68f91c JM |
148 | -Asparc, -Asparcvis, -Asparcvis2, -Asparcfmaf, -Asparcima, |
149 | -Asparcvis3, and -Asparcvis3r, respectively. | |
252b5132 RH |
150 | |
151 | @item -bump | |
152 | Warn whenever it is necessary to switch to another level. | |
153 | If an architecture level is explicitly requested, GAS will not issue | |
154 | warnings until that level is reached, and will then bump the level | |
155 | as required (except between incompatible levels). | |
156 | ||
157 | @item -32 | -64 | |
158 | Select the word size, either 32 bits or 64 bits. | |
159 | These options are only available with the ELF object file format, | |
160 | and require that the necessary BFD support has been included. | |
46a2d504 JM |
161 | |
162 | @item --dcti-couples-detect | |
163 | Warn if a DCTI (delayed control transfer instruction) couple is found | |
164 | when generating code for a variant of the SPARC architecture in which | |
165 | the execution of the couple is unpredictable, or very slow. This is | |
166 | disabled by default. | |
252b5132 RH |
167 | @end table |
168 | ||
169 | @node Sparc-Aligned-Data | |
170 | @section Enforcing aligned data | |
171 | ||
172 | @cindex data alignment on SPARC | |
173 | @cindex SPARC data alignment | |
174 | SPARC GAS normally permits data to be misaligned. For example, it | |
175 | permits the @code{.long} pseudo-op to be used on a byte boundary. | |
f04d18b7 DM |
176 | However, the native SunOS assemblers issue an error when they see |
177 | misaligned data. | |
252b5132 RH |
178 | |
179 | @kindex --enforce-aligned-data | |
180 | You can use the @code{--enforce-aligned-data} option to make SPARC GAS | |
f04d18b7 | 181 | also issue an error about misaligned data, just as the SunOS |
252b5132 RH |
182 | assemblers do. |
183 | ||
184 | The @code{--enforce-aligned-data} option is not the default because gcc | |
185 | issues misaligned data pseudo-ops when it initializes certain packed | |
186 | data structures (structures defined using the @code{packed} attribute). | |
187 | You may have to assemble with GAS in order to initialize packed data | |
188 | structures in your own code. | |
189 | ||
c15295d5 DM |
190 | @cindex SPARC syntax |
191 | @cindex syntax, SPARC | |
192 | @node Sparc-Syntax | |
193 | @section Sparc Syntax | |
194 | The assembler syntax closely follows The Sparc Architecture Manual, | |
195 | versions 8 and 9, as well as most extensions defined by Sun | |
196 | for their UltraSPARC and Niagara line of processors. | |
197 | ||
198 | @menu | |
199 | * Sparc-Chars:: Special Characters | |
200 | * Sparc-Regs:: Register Names | |
1a6b486f | 201 | * Sparc-Constants:: Constant Names |
c15295d5 | 202 | * Sparc-Relocs:: Relocations |
f04d18b7 | 203 | * Sparc-Size-Translations:: Size Translations |
c15295d5 DM |
204 | @end menu |
205 | ||
206 | @node Sparc-Chars | |
207 | @subsection Special Characters | |
208 | ||
209 | @cindex line comment character, Sparc | |
210 | @cindex Sparc line comment character | |
7c31ae13 NC |
211 | A @samp{!} character appearing anywhere on a line indicates the start |
212 | of a comment that extends to the end of that line. | |
213 | ||
214 | If a @samp{#} appears as the first character of a line then the whole | |
215 | line is treated as a comment, but in this case the line could also be | |
216 | a logical line number directive (@pxref{Comments}) or a preprocessor | |
217 | control command (@pxref{Preprocessing}). | |
c15295d5 DM |
218 | |
219 | @cindex line separator, Sparc | |
220 | @cindex statement separator, Sparc | |
221 | @cindex Sparc line separator | |
222 | @samp{;} can be used instead of a newline to separate statements. | |
223 | ||
224 | @node Sparc-Regs | |
225 | @subsection Register Names | |
226 | @cindex Sparc registers | |
227 | @cindex register names, Sparc | |
228 | ||
229 | The Sparc integer register file is broken down into global, | |
230 | outgoing, local, and incoming. | |
231 | ||
232 | @itemize @bullet | |
233 | @item | |
234 | The 8 global registers are referred to as @samp{%g@var{n}}. | |
235 | ||
236 | @item | |
237 | The 8 outgoing registers are referred to as @samp{%o@var{n}}. | |
238 | ||
239 | @item | |
240 | The 8 local registers are referred to as @samp{%l@var{n}}. | |
241 | ||
242 | @item | |
243 | The 8 incoming registers are referred to as @samp{%i@var{n}}. | |
244 | ||
245 | @item | |
246 | The frame pointer register @samp{%i6} can be referenced using | |
247 | the alias @samp{%fp}. | |
248 | ||
249 | @item | |
250 | The stack pointer register @samp{%o6} can be referenced using | |
251 | the alias @samp{%sp}. | |
252 | @end itemize | |
253 | ||
254 | Floating point registers are simply referred to as @samp{%f@var{n}}. | |
255 | When assembling for pre-V9, only 32 floating point registers | |
256 | are available. For V9 and later there are 64, but there are | |
257 | restrictions when referencing the upper 32 registers. They | |
258 | can only be accessed as double or quad, and thus only even | |
259 | or quad numbered accesses are allowed. For example, @samp{%f34} | |
260 | is a legal floating point register, but @samp{%f35} is not. | |
261 | ||
7039122d JM |
262 | Floating point registers accessed as double can also be referred using |
263 | the @samp{%d@var{n}} notation, where @var{n} is even. Similarly, | |
264 | floating point registers accessed as quad can be referred using the | |
265 | @samp{%q@var{n}} notation, where @var{n} is a multiple of 4. For | |
266 | example, @samp{%f4} can be denoted as both @samp{%d4} and @samp{%q4}. | |
267 | On the other hand, @samp{%f2} can be denoted as @samp{%d2} but not as | |
268 | @samp{%q2}. | |
269 | ||
c15295d5 DM |
270 | Certain V9 instructions allow access to ancillary state registers. |
271 | Most simply they can be referred to as @samp{%asr@var{n}} where | |
f04d18b7 | 272 | @var{n} can be from 16 to 31. However, there are some aliases |
c15295d5 DM |
273 | defined to reference ASR registers defined for various UltraSPARC |
274 | processors: | |
275 | ||
276 | @itemize @bullet | |
277 | @item | |
278 | The tick compare register is referred to as @samp{%tick_cmpr}. | |
279 | ||
280 | @item | |
1a6b486f DM |
281 | The system tick register is referred to as @samp{%stick}. An alias, |
282 | @samp{%sys_tick}, exists but is deprecated and should not be used | |
283 | by new software. | |
c15295d5 DM |
284 | |
285 | @item | |
1a6b486f DM |
286 | The system tick compare register is referred to as @samp{%stick_cmpr}. |
287 | An alias, @samp{%sys_tick_cmpr}, exists but is deprecated and should | |
288 | not be used by new software. | |
c15295d5 DM |
289 | |
290 | @item | |
291 | The software interrupt register is referred to as @samp{%softint}. | |
292 | ||
293 | @item | |
294 | The set software interrupt register is referred to as @samp{%set_softint}. | |
f04d18b7 | 295 | The mnemonic @samp{%softint_set} is provided as an alias. |
c15295d5 DM |
296 | |
297 | @item | |
298 | The clear software interrupt register is referred to as | |
f04d18b7 DM |
299 | @samp{%clear_softint}. The mnemonic @samp{%softint_clear} is provided |
300 | as an alias. | |
c15295d5 DM |
301 | |
302 | @item | |
303 | The performance instrumentation counters register is referred to as | |
304 | @samp{%pic}. | |
305 | ||
306 | @item | |
307 | The performance control register is referred to as @samp{%pcr}. | |
308 | ||
309 | @item | |
310 | The graphics status register is referred to as @samp{%gsr}. | |
311 | ||
312 | @item | |
f04d18b7 | 313 | The V9 dispatch control register is referred to as @samp{%dcr}. |
c15295d5 DM |
314 | @end itemize |
315 | ||
316 | Various V9 branch and conditional move instructions allow | |
317 | specification of which set of integer condition codes to | |
318 | test. These are referred to as @samp{%xcc} and @samp{%icc}. | |
319 | ||
f9911beb JM |
320 | Additionally, GAS supports the so-called ``natural'' condition codes; |
321 | these are referred to as @samp{%ncc} and reference to @samp{%icc} if | |
322 | the word size is 32, @samp{%xcc} if the word size is 64. | |
323 | ||
c15295d5 DM |
324 | In V9, there are 4 sets of floating point condition codes |
325 | which are referred to as @samp{%fcc@var{n}}. | |
326 | ||
327 | Several special privileged and non-privileged registers | |
328 | exist: | |
329 | ||
330 | @itemize @bullet | |
331 | @item | |
332 | The V9 address space identifier register is referred to as @samp{%asi}. | |
333 | ||
334 | @item | |
335 | The V9 restorable windows register is referred to as @samp{%canrestore}. | |
336 | ||
337 | @item | |
338 | The V9 savable windows register is referred to as @samp{%cansave}. | |
339 | ||
340 | @item | |
341 | The V9 clean windows register is referred to as @samp{%cleanwin}. | |
342 | ||
343 | @item | |
344 | The V9 current window pointer register is referred to as @samp{%cwp}. | |
345 | ||
346 | @item | |
347 | The floating-point queue register is referred to as @samp{%fq}. | |
348 | ||
349 | @item | |
f04d18b7 | 350 | The V8 co-processor queue register is referred to as @samp{%cq}. |
c15295d5 DM |
351 | |
352 | @item | |
353 | The floating point status register is referred to as @samp{%fsr}. | |
354 | ||
355 | @item | |
356 | The other windows register is referred to as @samp{%otherwin}. | |
357 | ||
358 | @item | |
359 | The V9 program counter register is referred to as @samp{%pc}. | |
360 | ||
361 | @item | |
362 | The V9 next program counter register is referred to as @samp{%npc}. | |
363 | ||
364 | @item | |
365 | The V9 processor interrupt level register is referred to as @samp{%pil}. | |
366 | ||
367 | @item | |
368 | The V9 processor state register is referred to as @samp{%pstate}. | |
369 | ||
370 | @item | |
371 | The trap base address register is referred to as @samp{%tba}. | |
372 | ||
373 | @item | |
374 | The V9 tick register is referred to as @samp{%tick}. | |
375 | ||
376 | @item | |
377 | The V9 trap level is referred to as @samp{%tl}. | |
378 | ||
379 | @item | |
380 | The V9 trap program counter is referred to as @samp{%tpc}. | |
381 | ||
382 | @item | |
383 | The V9 trap next program counter is referred to as @samp{%tnpc}. | |
384 | ||
385 | @item | |
386 | The V9 trap state is referred to as @samp{%tstate}. | |
387 | ||
388 | @item | |
389 | The V9 trap type is referred to as @samp{%tt}. | |
390 | ||
391 | @item | |
392 | The V9 condition codes is referred to as @samp{%ccr}. | |
393 | ||
394 | @item | |
395 | The V9 floating-point registers state is referred to as @samp{%fprs}. | |
396 | ||
397 | @item | |
398 | The V9 version register is referred to as @samp{%ver}. | |
399 | ||
400 | @item | |
401 | The V9 window state register is referred to as @samp{%wstate}. | |
402 | ||
403 | @item | |
404 | The Y register is referred to as @samp{%y}. | |
405 | ||
406 | @item | |
407 | The V8 window invalid mask register is referred to as @samp{%wim}. | |
408 | ||
409 | @item | |
410 | The V8 processor state register is referred to as @samp{%psr}. | |
411 | ||
412 | @item | |
f04d18b7 | 413 | The V9 global register level register is referred to as @samp{%gl}. |
c15295d5 DM |
414 | @end itemize |
415 | ||
416 | Several special register names exist for hypervisor mode code: | |
417 | ||
418 | @itemize @bullet | |
419 | @item | |
420 | The hyperprivileged processor state register is referred to as | |
421 | @samp{%hpstate}. | |
422 | ||
423 | @item | |
424 | The hyperprivileged trap state register is referred to as @samp{%htstate}. | |
425 | ||
426 | @item | |
427 | The hyperprivileged interrupt pending register is referred to as | |
428 | @samp{%hintp}. | |
429 | ||
430 | @item | |
431 | The hyperprivileged trap base address register is referred to as | |
432 | @samp{%htba}. | |
433 | ||
434 | @item | |
435 | The hyperprivileged implementation version register is referred | |
436 | to as @samp{%hver}. | |
437 | ||
ec92c392 JM |
438 | @item |
439 | The hyperprivileged system tick offset register is referred to as | |
440 | @samp{%hstick_offset}. Note that there is no @samp{%hstick} register, | |
441 | the normal @samp{%stick} is used. | |
442 | ||
443 | @item | |
444 | The hyperprivileged system tick enable register is referred to as | |
445 | @samp{%hstick_enable}. | |
446 | ||
c15295d5 DM |
447 | @item |
448 | The hyperprivileged system tick compare register is referred | |
ec92c392 | 449 | to as @samp{%hstick_cmpr}. |
1a6b486f DM |
450 | @end itemize |
451 | ||
452 | @node Sparc-Constants | |
453 | @subsection Constants | |
454 | @cindex Sparc constants | |
455 | @cindex constants, Sparc | |
456 | ||
457 | Several Sparc instructions take an immediate operand field for | |
458 | which mnemonic names exist. Two such examples are @samp{membar} | |
459 | and @samp{prefetch}. Another example are the set of V9 | |
460 | memory access instruction that allow specification of an | |
461 | address space identifier. | |
462 | ||
463 | The @samp{membar} instruction specifies a memory barrier that is | |
464 | the defined by the operand which is a bitmask. The supported | |
465 | mask mnemonics are: | |
466 | ||
467 | @itemize @bullet | |
468 | @item | |
469 | @samp{#Sync} requests that all operations (including nonmemory | |
470 | reference operations) appearing prior to the @code{membar} must have | |
471 | been performed and the effects of any exceptions become visible before | |
472 | any instructions after the @code{membar} may be initiated. This | |
473 | corresponds to @code{membar} cmask field bit 2. | |
474 | ||
475 | @item | |
476 | @samp{#MemIssue} requests that all memory reference operations | |
477 | appearing prior to the @code{membar} must have been performed before | |
478 | any memory operation after the @code{membar} may be initiated. This | |
479 | corresponds to @code{membar} cmask field bit 1. | |
480 | ||
481 | @item | |
482 | @samp{#Lookaside} requests that a store appearing prior to the | |
483 | @code{membar} must complete before any load following the | |
484 | @code{membar} referencing the same address can be initiated. This | |
485 | corresponds to @code{membar} cmask field bit 0. | |
486 | ||
487 | @item | |
488 | @samp{#StoreStore} defines that the effects of all stores appearing | |
489 | prior to the @code{membar} instruction must be visible to all | |
490 | processors before the effect of any stores following the | |
491 | @code{membar}. Equivalent to the deprecated @code{stbar} instruction. | |
492 | This corresponds to @code{membar} mmask field bit 3. | |
493 | ||
494 | @item | |
495 | @samp{#LoadStore} defines all loads appearing prior to the | |
496 | @code{membar} instruction must have been performed before the effect | |
497 | of any stores following the @code{membar} is visible to any other | |
498 | processor. This corresponds to @code{membar} mmask field bit 2. | |
499 | ||
500 | @item | |
501 | @samp{#StoreLoad} defines that the effects of all stores appearing | |
502 | prior to the @code{membar} instruction must be visible to all | |
503 | processors before loads following the @code{membar} may be performed. | |
504 | This corresponds to @code{membar} mmask field bit 1. | |
505 | ||
506 | @item | |
507 | @samp{#LoadLoad} defines that all loads appearing prior to the | |
508 | @code{membar} instruction must have been performed before any loads | |
509 | following the @code{membar} may be performed. This corresponds to | |
510 | @code{membar} mmask field bit 0. | |
511 | ||
512 | @end itemize | |
513 | ||
514 | These values can be ored together, for example: | |
515 | ||
516 | @example | |
517 | membar #Sync | |
518 | membar #StoreLoad | #LoadLoad | |
519 | membar #StoreLoad | #StoreStore | |
520 | @end example | |
521 | ||
522 | The @code{prefetch} and @code{prefetcha} instructions take a prefetch | |
523 | function code. The following prefetch function code constant | |
524 | mnemonics are available: | |
525 | ||
526 | @itemize @bullet | |
527 | @item | |
528 | @samp{#n_reads} requests a prefetch for several reads, and corresponds | |
529 | to a prefetch function code of 0. | |
530 | ||
531 | @samp{#one_read} requests a prefetch for one read, and corresponds | |
532 | to a prefetch function code of 1. | |
533 | ||
534 | @samp{#n_writes} requests a prefetch for several writes (and possibly | |
535 | reads), and corresponds to a prefetch function code of 2. | |
536 | ||
537 | @samp{#one_write} requests a prefetch for one write, and corresponds | |
538 | to a prefetch function code of 3. | |
539 | ||
540 | @samp{#page} requests a prefetch page, and corresponds to a prefetch | |
541 | function code of 4. | |
542 | ||
543 | @samp{#invalidate} requests a prefetch invalidate, and corresponds to | |
544 | a prefetch function code of 16. | |
545 | ||
546 | @samp{#unified} requests a prefetch to the nearest unified cache, and | |
547 | corresponds to a prefetch function code of 17. | |
548 | ||
549 | @samp{#n_reads_strong} requests a strong prefetch for several reads, | |
550 | and corresponds to a prefetch function code of 20. | |
551 | ||
552 | @samp{#one_read_strong} requests a strong prefetch for one read, | |
553 | and corresponds to a prefetch function code of 21. | |
554 | ||
555 | @samp{#n_writes_strong} requests a strong prefetch for several writes, | |
556 | and corresponds to a prefetch function code of 22. | |
557 | ||
558 | @samp{#one_write_strong} requests a strong prefetch for one write, | |
559 | and corresponds to a prefetch function code of 23. | |
560 | ||
561 | Onle one prefetch code may be specified. Here are some examples: | |
562 | ||
563 | @example | |
564 | prefetch [%l0 + %l2], #one_read | |
565 | prefetch [%g2 + 8], #n_writes | |
566 | prefetcha [%g1] 0x8, #unified | |
567 | prefetcha [%o0 + 0x10] %asi, #n_reads | |
568 | @end example | |
569 | ||
570 | The actual behavior of a given prefetch function code is processor | |
571 | specific. If a processor does not implement a given prefetch | |
572 | function code, it will treat the prefetch instruction as a nop. | |
573 | ||
574 | For instructions that accept an immediate address space identifier, | |
575 | @code{@value{AS}} provides many mnemonics corresponding to | |
576 | V9 defined as well as UltraSPARC and Niagara extended values. | |
577 | For example, @samp{#ASI_P} and @samp{#ASI_BLK_INIT_QUAD_LDD_AIUS}. | |
578 | See the V9 and processor specific manuals for details. | |
579 | ||
c15295d5 DM |
580 | @end itemize |
581 | ||
582 | @node Sparc-Relocs | |
583 | @subsection Relocations | |
584 | @cindex Sparc relocations | |
585 | @cindex relocations, Sparc | |
586 | ||
587 | ELF relocations are available as defined in the 32-bit and 64-bit | |
588 | Sparc ELF specifications. | |
589 | ||
590 | @code{R_SPARC_HI22} is obtained using @samp{%hi} and @code{R_SPARC_LO10} | |
591 | is obtained using @samp{%lo}. Likewise @code{R_SPARC_HIX22} is | |
592 | obtained from @samp{%hix} and @code{R_SPARC_LOX10} is obtained | |
593 | using @samp{%lox}. For example: | |
594 | ||
595 | @example | |
596 | sethi %hi(symbol), %g1 | |
597 | or %g1, %lo(symbol), %g1 | |
598 | ||
599 | sethi %hix(symbol), %g1 | |
600 | xor %g1, %lox(symbol), %g1 | |
601 | @end example | |
602 | ||
603 | These ``high'' mnemonics extract bits 31:10 of their operand, | |
604 | and the ``low'' mnemonics extract bits 9:0 of their operand. | |
605 | ||
606 | V9 code model relocations can be requested as follows: | |
607 | ||
608 | @itemize @bullet | |
609 | @item | |
610 | @code{R_SPARC_HH22} is requested using @samp{%hh}. It can | |
611 | also be generated using @samp{%uhi}. | |
612 | @item | |
613 | @code{R_SPARC_HM10} is requested using @samp{%hm}. It can | |
614 | also be generated using @samp{%ulo}. | |
615 | @item | |
616 | @code{R_SPARC_LM22} is requested using @samp{%lm}. | |
617 | ||
618 | @item | |
619 | @code{R_SPARC_H44} is requested using @samp{%h44}. | |
620 | @item | |
621 | @code{R_SPARC_M44} is requested using @samp{%m44}. | |
622 | @item | |
2755f698 DM |
623 | @code{R_SPARC_L44} is requested using @samp{%l44} or @samp{%l34}. |
624 | @item | |
625 | @code{R_SPARC_H34} is requested using @samp{%h34}. | |
c15295d5 DM |
626 | @end itemize |
627 | ||
2755f698 DM |
628 | The @samp{%l34} generates a @code{R_SPARC_L44} relocation because it |
629 | calculates the necessary value, and therefore no explicit | |
630 | @code{R_SPARC_L34} relocation needed to be created for this purpose. | |
631 | ||
632 | The @samp{%h34} and @samp{%l34} relocations are used for the abs34 code | |
633 | model. Here is an example abs34 address generation sequence: | |
634 | ||
635 | @example | |
636 | sethi %h34(symbol), %g1 | |
637 | sllx %g1, 2, %g1 | |
638 | or %g1, %l34(symbol), %g1 | |
639 | @end example | |
640 | ||
c15295d5 DM |
641 | The PC relative relocation @code{R_SPARC_PC22} can be obtained by |
642 | enclosing an operand inside of @samp{%pc22}. Likewise, the | |
643 | @code{R_SPARC_PC10} relocation can be obtained using @samp{%pc10}. | |
644 | These are mostly used when assembling PIC code. For example, the | |
645 | standard PIC sequence on Sparc to get the base of the global offset | |
646 | table, PC relative, into a register, can be performed as: | |
647 | ||
648 | @example | |
649 | sethi %pc22(_GLOBAL_OFFSET_TABLE_-4), %l7 | |
650 | add %l7, %pc10(_GLOBAL_OFFSET_TABLE_+4), %l7 | |
651 | @end example | |
652 | ||
653 | Several relocations exist to allow the link editor to potentially | |
654 | optimize GOT data references. The @code{R_SPARC_GOTDATA_OP_HIX22} | |
655 | relocation can obtained by enclosing an operand inside of | |
656 | @samp{%gdop_hix22}. The @code{R_SPARC_GOTDATA_OP_LOX10} | |
657 | relocation can obtained by enclosing an operand inside of | |
658 | @samp{%gdop_lox10}. Likewise, @code{R_SPARC_GOTDATA_OP} can be | |
659 | obtained by enclosing an operand inside of @samp{%gdop}. | |
660 | For example, assuming the GOT base is in register @code{%l7}: | |
661 | ||
662 | @example | |
663 | sethi %gdop_hix22(symbol), %l1 | |
664 | xor %l1, %gdop_lox10(symbol), %l1 | |
665 | ld [%l7 + %l1], %l2, %gdop(symbol) | |
666 | @end example | |
667 | ||
668 | There are many relocations that can be requested for access to | |
669 | thread local storage variables. All of the Sparc TLS mnemonics | |
670 | are supported: | |
671 | ||
672 | @itemize @bullet | |
673 | @item | |
674 | @code{R_SPARC_TLS_GD_HI22} is requested using @samp{%tgd_hi22}. | |
675 | @item | |
676 | @code{R_SPARC_TLS_GD_LO10} is requested using @samp{%tgd_lo10}. | |
677 | @item | |
678 | @code{R_SPARC_TLS_GD_ADD} is requested using @samp{%tgd_add}. | |
679 | @item | |
680 | @code{R_SPARC_TLS_GD_CALL} is requested using @samp{%tgd_call}. | |
681 | ||
682 | @item | |
683 | @code{R_SPARC_TLS_LDM_HI22} is requested using @samp{%tldm_hi22}. | |
684 | @item | |
685 | @code{R_SPARC_TLS_LDM_LO10} is requested using @samp{%tldm_lo10}. | |
686 | @item | |
687 | @code{R_SPARC_TLS_LDM_ADD} is requested using @samp{%tldm_add}. | |
688 | @item | |
689 | @code{R_SPARC_TLS_LDM_CALL} is requested using @samp{%tldm_call}. | |
690 | ||
691 | @item | |
692 | @code{R_SPARC_TLS_LDO_HIX22} is requested using @samp{%tldo_hix22}. | |
693 | @item | |
694 | @code{R_SPARC_TLS_LDO_LOX10} is requested using @samp{%tldo_lox10}. | |
695 | @item | |
696 | @code{R_SPARC_TLS_LDO_ADD} is requested using @samp{%tldo_add}. | |
697 | ||
698 | @item | |
699 | @code{R_SPARC_TLS_IE_HI22} is requested using @samp{%tie_hi22}. | |
700 | @item | |
701 | @code{R_SPARC_TLS_IE_LO10} is requested using @samp{%tie_lo10}. | |
702 | @item | |
703 | @code{R_SPARC_TLS_IE_LD} is requested using @samp{%tie_ld}. | |
704 | @item | |
705 | @code{R_SPARC_TLS_IE_LDX} is requested using @samp{%tie_ldx}. | |
706 | @item | |
707 | @code{R_SPARC_TLS_IE_ADD} is requested using @samp{%tie_add}. | |
708 | ||
709 | @item | |
710 | @code{R_SPARC_TLS_LE_HIX22} is requested using @samp{%tle_hix22}. | |
711 | @item | |
712 | @code{R_SPARC_TLS_LE_LOX10} is requested using @samp{%tle_lox10}. | |
713 | @end itemize | |
714 | ||
715 | Here are some example TLS model sequences. | |
716 | ||
717 | First, General Dynamic: | |
718 | ||
719 | @example | |
720 | sethi %tgd_hi22(symbol), %l1 | |
721 | add %l1, %tgd_lo10(symbol), %l1 | |
722 | add %l7, %l1, %o0, %tgd_add(symbol) | |
723 | call __tls_get_addr, %tgd_call(symbol) | |
724 | nop | |
725 | @end example | |
726 | ||
727 | Local Dynamic: | |
728 | ||
729 | @example | |
730 | sethi %tldm_hi22(symbol), %l1 | |
731 | add %l1, %tldm_lo10(symbol), %l1 | |
732 | add %l7, %l1, %o0, %tldm_add(symbol) | |
733 | call __tls_get_addr, %tldm_call(symbol) | |
734 | nop | |
735 | ||
736 | sethi %tldo_hix22(symbol), %l1 | |
737 | xor %l1, %tldo_lox10(symbol), %l1 | |
738 | add %o0, %l1, %l1, %tldo_add(symbol) | |
739 | @end example | |
740 | ||
741 | Initial Exec: | |
742 | ||
743 | @example | |
744 | sethi %tie_hi22(symbol), %l1 | |
745 | add %l1, %tie_lo10(symbol), %l1 | |
746 | ld [%l7 + %l1], %o0, %tie_ld(symbol) | |
747 | add %g7, %o0, %o0, %tie_add(symbol) | |
748 | ||
749 | sethi %tie_hi22(symbol), %l1 | |
750 | add %l1, %tie_lo10(symbol), %l1 | |
751 | ldx [%l7 + %l1], %o0, %tie_ldx(symbol) | |
752 | add %g7, %o0, %o0, %tie_add(symbol) | |
753 | @end example | |
754 | ||
755 | And finally, Local Exec: | |
756 | ||
757 | @example | |
758 | sethi %tle_hix22(symbol), %l1 | |
759 | add %l1, %tle_lox10(symbol), %l1 | |
760 | add %g7, %l1, %l1 | |
761 | @end example | |
762 | ||
763 | When assembling for 64-bit, and a secondary constant addend is | |
764 | specified in an address expression that would normally generate | |
765 | an @code{R_SPARC_LO10} relocation, the assembler will emit an | |
766 | @code{R_SPARC_OLO10} instead. | |
252b5132 | 767 | |
f04d18b7 DM |
768 | @node Sparc-Size-Translations |
769 | @subsection Size Translations | |
770 | @cindex Sparc size translations | |
771 | @cindex size, translations, Sparc | |
772 | ||
773 | Often it is desirable to write code in an operand size agnostic | |
774 | manner. @code{@value{AS}} provides support for this via | |
775 | operand size opcode translations. Translations are supported | |
776 | for loads, stores, shifts, compare-and-swap atomics, and the | |
777 | @samp{clr} synthetic instruction. | |
778 | ||
779 | If generating 32-bit code, @code{@value{AS}} will generate the | |
780 | 32-bit opcode. Whereas if 64-bit code is being generated, | |
781 | the 64-bit opcode will be emitted. For example @code{ldn} | |
782 | will be transformed into @code{ld} for 32-bit code and | |
783 | @code{ldx} for 64-bit code. | |
784 | ||
785 | Here is an example meant to demonstrate all the supported | |
786 | opcode translations: | |
787 | ||
788 | @example | |
789 | ldn [%o0], %o1 | |
790 | ldna [%o0] %asi, %o2 | |
791 | stn %o1, [%o0] | |
792 | stna %o2, [%o0] %asi | |
793 | slln %o3, 3, %o3 | |
794 | srln %o4, 8, %o4 | |
795 | sran %o5, 12, %o5 | |
796 | casn [%o0], %o1, %o2 | |
797 | casna [%o0] %asi, %o1, %o2 | |
798 | clrn %g1 | |
799 | @end example | |
800 | ||
801 | In 32-bit mode @code{@value{AS}} will emit: | |
802 | ||
803 | @example | |
804 | ld [%o0], %o1 | |
805 | lda [%o0] %asi, %o2 | |
806 | st %o1, [%o0] | |
807 | sta %o2, [%o0] %asi | |
808 | sll %o3, 3, %o3 | |
809 | srl %o4, 8, %o4 | |
810 | sra %o5, 12, %o5 | |
811 | cas [%o0], %o1, %o2 | |
812 | casa [%o0] %asi, %o1, %o2 | |
813 | clr %g1 | |
814 | @end example | |
815 | ||
816 | And in 64-bit mode @code{@value{AS}} will emit: | |
817 | ||
818 | @example | |
819 | ldx [%o0], %o1 | |
820 | ldxa [%o0] %asi, %o2 | |
821 | stx %o1, [%o0] | |
822 | stxa %o2, [%o0] %asi | |
823 | sllx %o3, 3, %o3 | |
824 | srlx %o4, 8, %o4 | |
825 | srax %o5, 12, %o5 | |
826 | casx [%o0], %o1, %o2 | |
827 | casxa [%o0] %asi, %o1, %o2 | |
828 | clrx %g1 | |
829 | @end example | |
830 | ||
831 | Finally, the @samp{.nword} translating directive is supported | |
832 | as well. It is documented in the section on Sparc machine | |
833 | directives. | |
834 | ||
252b5132 RH |
835 | @node Sparc-Float |
836 | @section Floating Point | |
837 | ||
838 | @cindex floating point, SPARC (@sc{ieee}) | |
839 | @cindex SPARC floating point (@sc{ieee}) | |
840 | The Sparc uses @sc{ieee} floating-point numbers. | |
841 | ||
842 | @node Sparc-Directives | |
843 | @section Sparc Machine Directives | |
844 | ||
845 | @cindex SPARC machine directives | |
846 | @cindex machine directives, SPARC | |
847 | The Sparc version of @code{@value{AS}} supports the following additional | |
848 | machine directives: | |
849 | ||
850 | @table @code | |
851 | @cindex @code{align} directive, SPARC | |
852 | @item .align | |
853 | This must be followed by the desired alignment in bytes. | |
854 | ||
855 | @cindex @code{common} directive, SPARC | |
856 | @item .common | |
857 | This must be followed by a symbol name, a positive number, and | |
858 | @code{"bss"}. This behaves somewhat like @code{.comm}, but the | |
859 | syntax is different. | |
860 | ||
861 | @cindex @code{half} directive, SPARC | |
862 | @item .half | |
863 | This is functionally identical to @code{.short}. | |
864 | ||
e06510e6 RH |
865 | @cindex @code{nword} directive, SPARC |
866 | @item .nword | |
867 | On the Sparc, the @code{.nword} directive produces native word sized value, | |
868 | ie. if assembling with -32 it is equivalent to @code{.word}, if assembling | |
869 | with -64 it is equivalent to @code{.xword}. | |
870 | ||
252b5132 RH |
871 | @cindex @code{proc} directive, SPARC |
872 | @item .proc | |
873 | This directive is ignored. Any text following it on the same | |
874 | line is also ignored. | |
875 | ||
e06510e6 RH |
876 | @cindex @code{register} directive, SPARC |
877 | @item .register | |
878 | This directive declares use of a global application or system register. | |
879 | It must be followed by a register name %g2, %g3, %g6 or %g7, comma and | |
6d8809aa | 880 | the symbol name for that register. If symbol name is @code{#scratch}, |
062b7c0c | 881 | it is a scratch register, if it is @code{#ignore}, it just suppresses any |
6d8809aa RH |
882 | errors about using undeclared global register, but does not emit any |
883 | information about it into the object file. This can be useful e.g. if you | |
884 | save the register before use and restore it after. | |
e06510e6 | 885 | |
252b5132 RH |
886 | @cindex @code{reserve} directive, SPARC |
887 | @item .reserve | |
888 | This must be followed by a symbol name, a positive number, and | |
889 | @code{"bss"}. This behaves somewhat like @code{.lcomm}, but the | |
890 | syntax is different. | |
891 | ||
892 | @cindex @code{seg} directive, SPARC | |
893 | @item .seg | |
894 | This must be followed by @code{"text"}, @code{"data"}, or | |
895 | @code{"data1"}. It behaves like @code{.text}, @code{.data}, or | |
896 | @code{.data 1}. | |
897 | ||
898 | @cindex @code{skip} directive, SPARC | |
899 | @item .skip | |
900 | This is functionally identical to the @code{.space} directive. | |
901 | ||
902 | @cindex @code{word} directive, SPARC | |
903 | @item .word | |
904 | On the Sparc, the @code{.word} directive produces 32 bit values, | |
905 | instead of the 16 bit values it produces on many other machines. | |
906 | ||
907 | @cindex @code{xword} directive, SPARC | |
908 | @item .xword | |
909 | On the Sparc V9 processor, the @code{.xword} directive produces | |
910 | 64 bit values. | |
911 | @end table |