Austin Schuh | dace2a6 | 2020-08-18 10:56:48 -0700 | [diff] [blame] | 1 | divert(-1) |
| 2 | |
| 3 | dnl m4 macros for x86 assembler. |
| 4 | |
| 5 | dnl Copyright 1999-2003, 2007, 2010, 2012, 2014 Free Software Foundation, Inc. |
| 6 | |
| 7 | dnl This file is part of the GNU MP Library. |
| 8 | dnl |
| 9 | dnl The GNU MP Library is free software; you can redistribute it and/or modify |
| 10 | dnl it under the terms of either: |
| 11 | dnl |
| 12 | dnl * the GNU Lesser General Public License as published by the Free |
| 13 | dnl Software Foundation; either version 3 of the License, or (at your |
| 14 | dnl option) any later version. |
| 15 | dnl |
| 16 | dnl or |
| 17 | dnl |
| 18 | dnl * the GNU General Public License as published by the Free Software |
| 19 | dnl Foundation; either version 2 of the License, or (at your option) any |
| 20 | dnl later version. |
| 21 | dnl |
| 22 | dnl or both in parallel, as here. |
| 23 | dnl |
| 24 | dnl The GNU MP Library is distributed in the hope that it will be useful, but |
| 25 | dnl WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY |
| 26 | dnl or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| 27 | dnl for more details. |
| 28 | dnl |
| 29 | dnl You should have received copies of the GNU General Public License and the |
| 30 | dnl GNU Lesser General Public License along with the GNU MP Library. If not, |
| 31 | dnl see https://www.gnu.org/licenses/. |
| 32 | |
| 33 | |
| 34 | dnl Notes: |
| 35 | dnl |
| 36 | dnl m4 isn't perfect for processing BSD style x86 assembler code, the main |
| 37 | dnl problems are, |
| 38 | dnl |
| 39 | dnl 1. Doing define(foo,123) and then using foo in an addressing mode like |
| 40 | dnl foo(%ebx) expands as a macro rather than a constant. This is worked |
| 41 | dnl around by using deflit() from asm-defs.m4, instead of define(). |
| 42 | dnl |
| 43 | dnl 2. Immediates in macro definitions need a space or `' to stop the $ |
| 44 | dnl looking like a macro parameter. For example, |
| 45 | dnl |
| 46 | dnl define(foo, `mov $ 123, %eax') |
| 47 | dnl |
| 48 | dnl This is only a problem in macro definitions, not in ordinary text, |
| 49 | dnl and not in macro parameters like text passed to forloop() or ifdef(). |
| 50 | |
| 51 | |
| 52 | deflit(GMP_LIMB_BYTES, 4) |
| 53 | |
| 54 | |
| 55 | dnl Libtool gives -DPIC -DDLL_EXPORT to indicate a cygwin or mingw DLL. We |
| 56 | dnl undefine PIC since we don't need to be position independent in this |
| 57 | dnl case and definitely don't want the ELF style _GLOBAL_OFFSET_TABLE_ etc. |
| 58 | |
| 59 | ifdef(`DLL_EXPORT',`undefine(`PIC')') |
| 60 | |
| 61 | |
| 62 | dnl Usage: CPUVEC_FUNCS_LIST |
| 63 | dnl |
| 64 | dnl A list of the functions from gmp-impl.h x86 struct cpuvec_t, in the |
| 65 | dnl order they appear in that structure. |
| 66 | |
| 67 | define(CPUVEC_FUNCS_LIST, |
| 68 | ``add_n', |
| 69 | `addlsh1_n', |
| 70 | `addlsh2_n', |
| 71 | `addmul_1', |
| 72 | `addmul_2', |
| 73 | `bdiv_dbm1c', |
| 74 | `cnd_add_n', |
| 75 | `cnd_sub_n', |
| 76 | `com', |
| 77 | `copyd', |
| 78 | `copyi', |
| 79 | `divexact_1', |
| 80 | `divrem_1', |
| 81 | `gcd_11', |
| 82 | `lshift', |
| 83 | `lshiftc', |
| 84 | `mod_1', |
| 85 | `mod_1_1p', |
| 86 | `mod_1_1p_cps', |
| 87 | `mod_1s_2p', |
| 88 | `mod_1s_2p_cps', |
| 89 | `mod_1s_4p', |
| 90 | `mod_1s_4p_cps', |
| 91 | `mod_34lsub1', |
| 92 | `modexact_1c_odd', |
| 93 | `mul_1', |
| 94 | `mul_basecase', |
| 95 | `mullo_basecase', |
| 96 | `preinv_divrem_1', |
| 97 | `preinv_mod_1', |
| 98 | `redc_1', |
| 99 | `redc_2', |
| 100 | `rshift', |
| 101 | `sqr_basecase', |
| 102 | `sub_n', |
| 103 | `sublsh1_n', |
| 104 | `submul_1'') |
| 105 | |
| 106 | |
| 107 | dnl Called: PROLOGUE_cpu(GSYM_PREFIX`'foo) |
| 108 | dnl |
| 109 | dnl In the x86 code we use explicit TEXT and ALIGN() calls in the code, |
| 110 | dnl since different alignments are wanted in various circumstances. So for |
| 111 | dnl instance, |
| 112 | dnl |
| 113 | dnl TEXT |
| 114 | dnl ALIGN(16) |
| 115 | dnl PROLOGUE(mpn_add_n) |
| 116 | dnl ... |
| 117 | dnl EPILOGUE() |
| 118 | |
| 119 | define(`PROLOGUE_cpu', |
| 120 | m4_assert_numargs(1) |
| 121 | m4_assert_defined(`WANT_PROFILING') |
| 122 | `GLOBL $1 |
| 123 | TYPE($1,`function') |
| 124 | COFF_TYPE($1) |
| 125 | $1: |
| 126 | ifelse(WANT_PROFILING,`prof', ` call_mcount') |
| 127 | ifelse(WANT_PROFILING,`gprof', ` call_mcount') |
| 128 | ifelse(WANT_PROFILING,`instrument',` call_instrument(enter)') |
| 129 | ') |
| 130 | |
| 131 | |
| 132 | dnl Usage: COFF_TYPE(GSYM_PREFIX`'foo) |
| 133 | dnl |
| 134 | dnl Emit COFF style ".def ... .endef" type information for a function, when |
| 135 | dnl supported. The argument should include any GSYM_PREFIX. |
| 136 | dnl |
| 137 | dnl See autoconf macro GMP_ASM_COFF_TYPE for HAVE_COFF_TYPE. |
| 138 | |
| 139 | define(COFF_TYPE, |
| 140 | m4_assert_numargs(1) |
| 141 | m4_assert_defined(`HAVE_COFF_TYPE') |
| 142 | `ifelse(HAVE_COFF_TYPE,yes, |
| 143 | `.def $1 |
| 144 | .scl 2 |
| 145 | .type 32 |
| 146 | .endef')') |
| 147 | |
| 148 | |
| 149 | dnl Usage: call_mcount |
| 150 | dnl |
| 151 | dnl For `gprof' style profiling, %ebp is setup as a frame pointer. None of |
| 152 | dnl the assembler routines use %ebp this way, so it's done only for the |
| 153 | dnl benefit of mcount. glibc sysdeps/i386/i386-mcount.S shows how mcount |
| 154 | dnl gets the current function from (%esp) and the parent from 4(%ebp). |
| 155 | dnl |
| 156 | dnl For `prof' style profiling gcc generates mcount calls without setting |
| 157 | dnl up %ebp, and the same is done here. |
| 158 | |
| 159 | define(`call_mcount', |
| 160 | m4_assert_numargs(-1) |
| 161 | m4_assert_defined(`WANT_PROFILING') |
| 162 | m4_assert_defined(`MCOUNT_PIC_REG') |
| 163 | m4_assert_defined(`MCOUNT_NONPIC_REG') |
| 164 | m4_assert_defined(`MCOUNT_PIC_CALL') |
| 165 | m4_assert_defined(`MCOUNT_NONPIC_CALL') |
| 166 | `ifelse(ifdef(`PIC',`MCOUNT_PIC_REG',`MCOUNT_NONPIC_REG'),,, |
| 167 | ` DATA |
| 168 | ALIGN(4) |
| 169 | L(mcount_data_`'mcount_counter): |
| 170 | W32 0 |
| 171 | TEXT |
| 172 | ')dnl |
| 173 | ifelse(WANT_PROFILING,`gprof', |
| 174 | ` pushl %ebp |
| 175 | movl %esp, %ebp |
| 176 | ')dnl |
| 177 | ifdef(`PIC', |
| 178 | ` pushl %ebx |
| 179 | call_movl_eip_to_ebx |
| 180 | L(mcount_here_`'mcount_counter): |
| 181 | addl $_GLOBAL_OFFSET_TABLE_+[.-L(mcount_here_`'mcount_counter)], %ebx |
| 182 | ifelse(MCOUNT_PIC_REG,,, |
| 183 | ` leal L(mcount_data_`'mcount_counter)@GOTOFF(%ebx), MCOUNT_PIC_REG') |
| 184 | MCOUNT_PIC_CALL |
| 185 | popl %ebx |
| 186 | ',`dnl non-PIC |
| 187 | ifelse(MCOUNT_NONPIC_REG,,, |
| 188 | ` movl `$'L(mcount_data_`'mcount_counter), MCOUNT_NONPIC_REG |
| 189 | ')dnl |
| 190 | MCOUNT_NONPIC_CALL |
| 191 | ')dnl |
| 192 | ifelse(WANT_PROFILING,`gprof', |
| 193 | ` popl %ebp |
| 194 | ') |
| 195 | define(`mcount_counter',incr(mcount_counter)) |
| 196 | ') |
| 197 | |
| 198 | define(mcount_counter,1) |
| 199 | |
| 200 | |
| 201 | dnl Usage: call_instrument(enter|exit) |
| 202 | dnl |
| 203 | dnl Call __cyg_profile_func_enter or __cyg_profile_func_exit. |
| 204 | dnl |
| 205 | dnl For PIC, most routines don't require _GLOBAL_OFFSET_TABLE_ themselves |
| 206 | dnl so %ebx is just setup for these calls. It's a bit wasteful to repeat |
| 207 | dnl the setup for the exit call having done it earlier for the enter, but |
| 208 | dnl there's nowhere very convenient to hold %ebx through the length of a |
| 209 | dnl routine, in general. |
| 210 | dnl |
| 211 | dnl For PIC, because instrument_current_function will be within the current |
| 212 | dnl object file we can get it just as an offset from %eip, there's no need |
| 213 | dnl to use the GOT. |
| 214 | dnl |
| 215 | dnl No attempt is made to maintain the stack alignment gcc generates with |
| 216 | dnl -mpreferred-stack-boundary. This wouldn't be hard, but it seems highly |
| 217 | dnl unlikely the instrumenting functions would be doing anything that'd |
| 218 | dnl benefit from alignment, in particular they're unlikely to be using |
| 219 | dnl doubles or long doubles on the stack. |
| 220 | dnl |
| 221 | dnl The FRAME scheme is used to conveniently account for the register saves |
| 222 | dnl before accessing the return address. Any previous value is saved and |
| 223 | dnl restored, since plenty of code keeps a value across a "ret" in the |
| 224 | dnl middle of a routine. |
| 225 | |
| 226 | define(call_instrument, |
| 227 | m4_assert_numargs(1) |
| 228 | ` pushdef(`FRAME',0) |
| 229 | ifelse($1,exit, |
| 230 | ` pushl %eax FRAME_pushl() C return value |
| 231 | ') |
| 232 | ifdef(`PIC', |
| 233 | ` pushl %ebx FRAME_pushl() |
| 234 | call_movl_eip_to_ebx |
| 235 | L(instrument_here_`'instrument_count): |
| 236 | movl %ebx, %ecx |
| 237 | addl $_GLOBAL_OFFSET_TABLE_+[.-L(instrument_here_`'instrument_count)], %ebx |
| 238 | C use addl rather than leal to avoid old gas bugs, see mpn/x86/README |
| 239 | addl $instrument_current_function-L(instrument_here_`'instrument_count), %ecx |
| 240 | pushl m4_empty_if_zero(FRAME)(%esp) FRAME_pushl() C return addr |
| 241 | pushl %ecx FRAME_pushl() C this function |
| 242 | call GSYM_PREFIX`'__cyg_profile_func_$1@PLT |
| 243 | addl $`'8, %esp |
| 244 | popl %ebx |
| 245 | ', |
| 246 | ` C non-PIC |
| 247 | pushl m4_empty_if_zero(FRAME)(%esp) FRAME_pushl() C return addr |
| 248 | pushl $instrument_current_function FRAME_pushl() C this function |
| 249 | call GSYM_PREFIX`'__cyg_profile_func_$1 |
| 250 | addl $`'8, %esp |
| 251 | ') |
| 252 | ifelse($1,exit, |
| 253 | ` popl %eax C return value |
| 254 | ') |
| 255 | popdef(`FRAME') |
| 256 | define(`instrument_count',incr(instrument_count)) |
| 257 | ') |
| 258 | define(instrument_count,1) |
| 259 | |
| 260 | |
| 261 | dnl Usage: instrument_current_function |
| 262 | dnl |
| 263 | dnl Return the current function name for instrumenting purposes. This is |
| 264 | dnl PROLOGUE_current_function, but it sticks at the first such name seen. |
| 265 | dnl |
| 266 | dnl Sticking to the first name seen ensures that multiple-entrypoint |
| 267 | dnl functions like mpn_add_nc and mpn_add_n will make enter and exit calls |
| 268 | dnl giving the same function address. |
| 269 | |
| 270 | define(instrument_current_function, |
| 271 | m4_assert_numargs(-1) |
| 272 | `ifdef(`instrument_current_function_seen', |
| 273 | `instrument_current_function_seen', |
| 274 | `define(`instrument_current_function_seen',PROLOGUE_current_function)dnl |
| 275 | PROLOGUE_current_function')') |
| 276 | |
| 277 | |
| 278 | dnl Usage: call_movl_eip_to_ebx |
| 279 | dnl |
| 280 | dnl Generate a call to L(movl_eip_to_ebx), and record the need for that |
| 281 | dnl routine. |
| 282 | |
| 283 | define(call_movl_eip_to_ebx, |
| 284 | m4_assert_numargs(-1) |
| 285 | `call L(movl_eip_to_ebx) |
| 286 | define(`movl_eip_to_ebx_needed',1)') |
| 287 | |
| 288 | dnl Usage: generate_movl_eip_to_ebx |
| 289 | dnl |
| 290 | dnl Emit a L(movl_eip_to_ebx) routine, if needed and not already generated. |
| 291 | |
| 292 | define(generate_movl_eip_to_ebx, |
| 293 | m4_assert_numargs(-1) |
| 294 | `ifelse(movl_eip_to_ebx_needed,1, |
| 295 | `ifelse(movl_eip_to_ebx_done,1,, |
| 296 | `L(movl_eip_to_ebx): |
| 297 | movl (%esp), %ebx |
| 298 | ret_internal |
| 299 | define(`movl_eip_to_ebx_done',1) |
| 300 | ')')') |
| 301 | |
| 302 | |
| 303 | dnl Usage: ret |
| 304 | dnl |
| 305 | dnl Generate a "ret", but if doing instrumented profiling then call |
| 306 | dnl __cyg_profile_func_exit first. |
| 307 | |
| 308 | define(ret, |
| 309 | m4_assert_numargs(-1) |
| 310 | m4_assert_defined(`WANT_PROFILING') |
| 311 | `ifelse(WANT_PROFILING,instrument, |
| 312 | `ret_instrument', |
| 313 | `ret_internal') |
| 314 | generate_movl_eip_to_ebx |
| 315 | ') |
| 316 | |
| 317 | |
| 318 | dnl Usage: ret_internal |
| 319 | dnl |
| 320 | dnl A plain "ret", without any __cyg_profile_func_exit call. This can be |
| 321 | dnl used for a return which is internal to some function, such as when |
| 322 | dnl getting %eip for PIC. |
| 323 | |
| 324 | define(ret_internal, |
| 325 | m4_assert_numargs(-1) |
| 326 | ``ret'') |
| 327 | |
| 328 | |
| 329 | dnl Usage: ret_instrument |
| 330 | dnl |
| 331 | dnl Generate call to __cyg_profile_func_exit and then a ret. If a ret has |
| 332 | dnl already been seen from this function then jump to that chunk of code, |
| 333 | dnl rather than emitting it again. |
| 334 | |
| 335 | define(ret_instrument, |
| 336 | m4_assert_numargs(-1) |
| 337 | `ifelse(m4_unquote(ret_instrument_seen_`'instrument_current_function),1, |
| 338 | `jmp L(instrument_exit_`'instrument_current_function)', |
| 339 | `define(ret_instrument_seen_`'instrument_current_function,1) |
| 340 | L(instrument_exit_`'instrument_current_function): |
| 341 | call_instrument(exit) |
| 342 | ret_internal')') |
| 343 | |
| 344 | |
| 345 | dnl Usage: _GLOBAL_OFFSET_TABLE_ |
| 346 | dnl |
| 347 | dnl Expand to _GLOBAL_OFFSET_TABLE_ plus any necessary underscore prefix. |
| 348 | dnl This lets us write plain _GLOBAL_OFFSET_TABLE_ in SVR4 style, but still |
| 349 | dnl work with systems requiring an extra underscore such as OpenBSD. |
| 350 | dnl |
| 351 | dnl deflit is used so "leal _GLOBAL_OFFSET_TABLE_(%eax), %ebx" will come |
| 352 | dnl out right, though that form doesn't work properly in gas (see |
| 353 | dnl mpn/x86/README). |
| 354 | |
| 355 | deflit(_GLOBAL_OFFSET_TABLE_, |
| 356 | m4_assert_defined(`GOT_GSYM_PREFIX') |
| 357 | `GOT_GSYM_PREFIX`_GLOBAL_OFFSET_TABLE_'') |
| 358 | |
| 359 | |
| 360 | dnl -------------------------------------------------------------------------- |
| 361 | dnl Various x86 macros. |
| 362 | dnl |
| 363 | |
| 364 | |
| 365 | dnl Usage: ALIGN_OFFSET(bytes,offset) |
| 366 | dnl |
| 367 | dnl Align to `offset' away from a multiple of `bytes'. |
| 368 | dnl |
| 369 | dnl This is useful for testing, for example align to something very strict |
| 370 | dnl and see what effect offsets from it have, "ALIGN_OFFSET(256,32)". |
| 371 | dnl |
| 372 | dnl Generally you wouldn't execute across the padding, but it's done with |
| 373 | dnl nop's so it'll work. |
| 374 | |
| 375 | define(ALIGN_OFFSET, |
| 376 | m4_assert_numargs(2) |
| 377 | `ALIGN($1) |
| 378 | forloop(`i',1,$2,` nop |
| 379 | ')') |
| 380 | |
| 381 | |
| 382 | dnl Usage: defframe(name,offset) |
| 383 | dnl |
| 384 | dnl Make a definition like the following with which to access a parameter |
| 385 | dnl or variable on the stack. |
| 386 | dnl |
| 387 | dnl define(name,`FRAME+offset(%esp)') |
| 388 | dnl |
| 389 | dnl Actually m4_empty_if_zero(FRAME+offset) is used, which will save one |
| 390 | dnl byte if FRAME+offset is zero, by putting (%esp) rather than 0(%esp). |
| 391 | dnl Use define(`defframe_empty_if_zero_disabled',1) if for some reason the |
| 392 | dnl zero offset is wanted. |
| 393 | dnl |
| 394 | dnl The new macro also gets a check that when it's used FRAME is actually |
| 395 | dnl defined, and that the final %esp offset isn't negative, which would |
| 396 | dnl mean an attempt to access something below the current %esp. |
| 397 | dnl |
| 398 | dnl deflit() is used rather than a plain define(), so the new macro won't |
| 399 | dnl delete any following parenthesized expression. name(%edi) will come |
| 400 | dnl out say as 16(%esp)(%edi). This isn't valid assembler and should |
| 401 | dnl provoke an error, which is better than silently giving just 16(%esp). |
| 402 | dnl |
| 403 | dnl See README for more on the suggested way to access the stack frame. |
| 404 | |
| 405 | define(defframe, |
| 406 | m4_assert_numargs(2) |
| 407 | `deflit(`$1', |
| 408 | m4_assert_defined(`FRAME') |
| 409 | `defframe_check_notbelow(`$1',$2,FRAME)dnl |
| 410 | defframe_empty_if_zero(FRAME+($2))(%esp)')') |
| 411 | |
| 412 | dnl Called: defframe_empty_if_zero(expression) |
| 413 | define(defframe_empty_if_zero, |
| 414 | m4_assert_numargs(1) |
| 415 | `ifelse(defframe_empty_if_zero_disabled,1, |
| 416 | `eval($1)', |
| 417 | `m4_empty_if_zero($1)')') |
| 418 | |
| 419 | dnl Called: defframe_check_notbelow(`name',offset,FRAME) |
| 420 | define(defframe_check_notbelow, |
| 421 | m4_assert_numargs(3) |
| 422 | `ifelse(eval(($3)+($2)<0),1, |
| 423 | `m4_error(`$1 at frame offset $2 used when FRAME is only $3 bytes |
| 424 | ')')') |
| 425 | |
| 426 | |
| 427 | dnl Usage: FRAME_pushl() |
| 428 | dnl FRAME_popl() |
| 429 | dnl FRAME_addl_esp(n) |
| 430 | dnl FRAME_subl_esp(n) |
| 431 | dnl |
| 432 | dnl Adjust FRAME appropriately for a pushl or popl, or for an addl or subl |
| 433 | dnl %esp of n bytes. |
| 434 | dnl |
| 435 | dnl Using these macros is completely optional. Sometimes it makes more |
| 436 | dnl sense to put explicit deflit(`FRAME',N) forms, especially when there's |
| 437 | dnl jumps and different sequences of FRAME values need to be used in |
| 438 | dnl different places. |
| 439 | |
| 440 | define(FRAME_pushl, |
| 441 | m4_assert_numargs(0) |
| 442 | m4_assert_defined(`FRAME') |
| 443 | `deflit(`FRAME',eval(FRAME+4))') |
| 444 | |
| 445 | define(FRAME_popl, |
| 446 | m4_assert_numargs(0) |
| 447 | m4_assert_defined(`FRAME') |
| 448 | `deflit(`FRAME',eval(FRAME-4))') |
| 449 | |
| 450 | define(FRAME_addl_esp, |
| 451 | m4_assert_numargs(1) |
| 452 | m4_assert_defined(`FRAME') |
| 453 | `deflit(`FRAME',eval(FRAME-($1)))') |
| 454 | |
| 455 | define(FRAME_subl_esp, |
| 456 | m4_assert_numargs(1) |
| 457 | m4_assert_defined(`FRAME') |
| 458 | `deflit(`FRAME',eval(FRAME+($1)))') |
| 459 | |
| 460 | |
| 461 | dnl Usage: defframe_pushl(name) |
| 462 | dnl |
| 463 | dnl Do a combination FRAME_pushl() and a defframe() to name the stack |
| 464 | dnl location just pushed. This should come after a pushl instruction. |
| 465 | dnl Putting it on the same line works and avoids lengthening the code. For |
| 466 | dnl example, |
| 467 | dnl |
| 468 | dnl pushl %eax defframe_pushl(VAR_COUNTER) |
| 469 | dnl |
| 470 | dnl Notice the defframe() is done with an unquoted -FRAME thus giving its |
| 471 | dnl current value without tracking future changes. |
| 472 | |
| 473 | define(defframe_pushl, |
| 474 | m4_assert_numargs(1) |
| 475 | `FRAME_pushl()defframe(`$1',-FRAME)') |
| 476 | |
| 477 | |
| 478 | dnl -------------------------------------------------------------------------- |
| 479 | dnl Assembler instruction macros. |
| 480 | dnl |
| 481 | |
| 482 | |
| 483 | dnl Usage: emms_or_femms |
| 484 | dnl femms_available_p |
| 485 | dnl |
| 486 | dnl femms_available_p expands to 1 or 0 according to whether the AMD 3DNow |
| 487 | dnl femms instruction is available. emms_or_femms expands to femms if |
| 488 | dnl available, or emms if not. |
| 489 | dnl |
| 490 | dnl emms_or_femms is meant for use in the K6 directory where plain K6 |
| 491 | dnl (without femms) and K6-2 and K6-3 (with a slightly faster femms) are |
| 492 | dnl supported together. |
| 493 | dnl |
| 494 | dnl On K7 femms is no longer faster and is just an alias for emms, so plain |
| 495 | dnl emms may as well be used. |
| 496 | |
| 497 | define(femms_available_p, |
| 498 | m4_assert_numargs(-1) |
| 499 | `m4_ifdef_anyof_p( |
| 500 | `HAVE_HOST_CPU_k62', |
| 501 | `HAVE_HOST_CPU_k63', |
| 502 | `HAVE_HOST_CPU_athlon')') |
| 503 | |
| 504 | define(emms_or_femms, |
| 505 | m4_assert_numargs(-1) |
| 506 | `ifelse(femms_available_p,1,`femms',`emms')') |
| 507 | |
| 508 | |
| 509 | dnl Usage: femms |
| 510 | dnl |
| 511 | dnl Gas 2.9.1 which comes with FreeBSD 3.4 doesn't support femms, so the |
| 512 | dnl following is a replacement using .byte. |
| 513 | |
| 514 | define(femms, |
| 515 | m4_assert_numargs(-1) |
| 516 | `.byte 15,14 C AMD 3DNow femms') |
| 517 | |
| 518 | |
| 519 | dnl Usage: jadcl0(op) |
| 520 | dnl |
| 521 | dnl Generate a jnc/incl as a substitute for adcl $0,op. Note this isn't an |
| 522 | dnl exact replacement, since it doesn't set the flags like adcl does. |
| 523 | dnl |
| 524 | dnl This finds a use in K6 mpn_addmul_1, mpn_submul_1, mpn_mul_basecase and |
| 525 | dnl mpn_sqr_basecase because on K6 an adcl is slow, the branch |
| 526 | dnl misprediction penalty is small, and the multiply algorithm used leads |
| 527 | dnl to a carry bit on average only 1/4 of the time. |
| 528 | dnl |
| 529 | dnl jadcl0_disabled can be set to 1 to instead generate an ordinary adcl |
| 530 | dnl for comparison. For example, |
| 531 | dnl |
| 532 | dnl define(`jadcl0_disabled',1) |
| 533 | dnl |
| 534 | dnl When using a register operand, eg. "jadcl0(%edx)", the jnc/incl code is |
| 535 | dnl the same size as an adcl. This makes it possible to use the exact same |
| 536 | dnl computed jump code when testing the relative speed of the two. |
| 537 | |
| 538 | define(jadcl0, |
| 539 | m4_assert_numargs(1) |
| 540 | `ifelse(jadcl0_disabled,1, |
| 541 | `adcl $`'0, $1', |
| 542 | `jnc L(jadcl0_`'jadcl0_counter) |
| 543 | incl $1 |
| 544 | L(jadcl0_`'jadcl0_counter): |
| 545 | define(`jadcl0_counter',incr(jadcl0_counter))')') |
| 546 | |
| 547 | define(jadcl0_counter,1) |
| 548 | |
| 549 | |
| 550 | dnl Usage: x86_lookup(target, key,value, key,value, ...) |
| 551 | dnl x86_lookup_p(target, key,value, key,value, ...) |
| 552 | dnl |
| 553 | dnl Look for `target' among the `key' parameters. |
| 554 | dnl |
| 555 | dnl x86_lookup expands to the corresponding `value', or generates an error |
| 556 | dnl if `target' isn't found. |
| 557 | dnl |
| 558 | dnl x86_lookup_p expands to 1 if `target' is found, or 0 if not. |
| 559 | |
| 560 | define(x86_lookup, |
| 561 | m4_assert_numargs_range(1,999) |
| 562 | `ifelse(eval($#<3),1, |
| 563 | `m4_error(`unrecognised part of x86 instruction: $1 |
| 564 | ')', |
| 565 | `ifelse(`$1',`$2', `$3', |
| 566 | `x86_lookup(`$1',shift(shift(shift($@))))')')') |
| 567 | |
| 568 | define(x86_lookup_p, |
| 569 | m4_assert_numargs_range(1,999) |
| 570 | `ifelse(eval($#<3),1, `0', |
| 571 | `ifelse(`$1',`$2', `1', |
| 572 | `x86_lookup_p(`$1',shift(shift(shift($@))))')')') |
| 573 | |
| 574 | |
| 575 | dnl Usage: x86_opcode_reg32(reg) |
| 576 | dnl x86_opcode_reg32_p(reg) |
| 577 | dnl |
| 578 | dnl x86_opcode_reg32 expands to the standard 3 bit encoding for the given |
| 579 | dnl 32-bit register, eg. `%ebp' turns into 5. |
| 580 | dnl |
| 581 | dnl x86_opcode_reg32_p expands to 1 if reg is a valid 32-bit register, or 0 |
| 582 | dnl if not. |
| 583 | |
| 584 | define(x86_opcode_reg32, |
| 585 | m4_assert_numargs(1) |
| 586 | `x86_lookup(`$1',x86_opcode_reg32_list)') |
| 587 | |
| 588 | define(x86_opcode_reg32_p, |
| 589 | m4_assert_onearg() |
| 590 | `x86_lookup_p(`$1',x86_opcode_reg32_list)') |
| 591 | |
| 592 | define(x86_opcode_reg32_list, |
| 593 | ``%eax',0, |
| 594 | `%ecx',1, |
| 595 | `%edx',2, |
| 596 | `%ebx',3, |
| 597 | `%esp',4, |
| 598 | `%ebp',5, |
| 599 | `%esi',6, |
| 600 | `%edi',7') |
| 601 | |
| 602 | |
| 603 | dnl Usage: x86_opcode_tttn(cond) |
| 604 | dnl |
| 605 | dnl Expand to the 4-bit "tttn" field value for the given x86 branch |
| 606 | dnl condition (like `c', `ae', etc). |
| 607 | |
| 608 | define(x86_opcode_tttn, |
| 609 | m4_assert_numargs(1) |
| 610 | `x86_lookup(`$1',x86_opcode_ttn_list)') |
| 611 | |
| 612 | define(x86_opcode_tttn_list, |
| 613 | ``o', 0, |
| 614 | `no', 1, |
| 615 | `b', 2, `c', 2, `nae',2, |
| 616 | `nb', 3, `nc', 3, `ae', 3, |
| 617 | `e', 4, `z', 4, |
| 618 | `ne', 5, `nz', 5, |
| 619 | `be', 6, `na', 6, |
| 620 | `nbe', 7, `a', 7, |
| 621 | `s', 8, |
| 622 | `ns', 9, |
| 623 | `p', 10, `pe', 10, `npo',10, |
| 624 | `np', 11, `npe',11, `po', 11, |
| 625 | `l', 12, `nge',12, |
| 626 | `nl', 13, `ge', 13, |
| 627 | `le', 14, `ng', 14, |
| 628 | `nle',15, `g', 15') |
| 629 | |
| 630 | |
| 631 | dnl Usage: cmovCC(%srcreg,%dstreg) |
| 632 | dnl |
| 633 | dnl Emit a cmov instruction, using a .byte sequence, since various past |
| 634 | dnl versions of gas don't know cmov. For example, |
| 635 | dnl |
| 636 | dnl cmovz( %eax, %ebx) |
| 637 | dnl |
| 638 | dnl The source operand can only be a plain register. (m4 code implementing |
| 639 | dnl full memory addressing modes exists, believe it or not, but isn't |
| 640 | dnl currently needed and isn't included.) |
| 641 | dnl |
| 642 | dnl All the standard conditions are defined. Attempting to use one without |
| 643 | dnl the macro parentheses, such as just "cmovbe %eax, %ebx", will provoke |
| 644 | dnl an error. This protects against writing something old gas wouldn't |
| 645 | dnl understand. |
| 646 | |
| 647 | dnl Called: define_cmov_many(cond,tttn,cond,tttn,...) |
| 648 | define(define_cmov_many, |
| 649 | `ifelse(m4_length(`$1'),0,, |
| 650 | `define_cmov(`$1',`$2')define_cmov_many(shift(shift($@)))')') |
| 651 | |
| 652 | dnl Called: define_cmov(cond,tttn) |
| 653 | dnl Emit basically define(cmov<cond>,`cmov_internal(<cond>,<ttn>,`$1',`$2')') |
| 654 | define(define_cmov, |
| 655 | m4_assert_numargs(2) |
| 656 | `define(`cmov$1', |
| 657 | m4_instruction_wrapper() |
| 658 | m4_assert_numargs(2) |
| 659 | `cmov_internal'(m4_doublequote($`'0),``$2'',dnl |
| 660 | m4_doublequote($`'1),m4_doublequote($`'2)))') |
| 661 | |
| 662 | define_cmov_many(x86_opcode_tttn_list) |
| 663 | |
| 664 | dnl Called: cmov_internal(name,tttn,src,dst) |
| 665 | define(cmov_internal, |
| 666 | m4_assert_numargs(4) |
| 667 | `.byte dnl |
| 668 | 15, dnl |
| 669 | eval(64+$2), dnl |
| 670 | eval(192+8*x86_opcode_reg32(`$4')+x86_opcode_reg32(`$3')) dnl |
| 671 | C `$1 $3, $4'') |
| 672 | |
| 673 | |
| 674 | dnl Usage: x86_opcode_regmmx(reg) |
| 675 | dnl |
| 676 | dnl Validate the given mmx register, and return its number, 0 to 7. |
| 677 | |
| 678 | define(x86_opcode_regmmx, |
| 679 | m4_assert_numargs(1) |
| 680 | `x86_lookup(`$1',x86_opcode_regmmx_list)') |
| 681 | |
| 682 | define(x86_opcode_regmmx_list, |
| 683 | ``%mm0',0, |
| 684 | `%mm1',1, |
| 685 | `%mm2',2, |
| 686 | `%mm3',3, |
| 687 | `%mm4',4, |
| 688 | `%mm5',5, |
| 689 | `%mm6',6, |
| 690 | `%mm7',7') |
| 691 | |
| 692 | |
| 693 | dnl Usage: psadbw(%srcreg,%dstreg) |
| 694 | dnl |
| 695 | dnl Oldish versions of gas don't know psadbw, in particular gas 2.9.1 on |
| 696 | dnl FreeBSD 3.3 and 3.4 doesn't, so instead emit .byte sequences. For |
| 697 | dnl example, |
| 698 | dnl |
| 699 | dnl psadbw( %mm1, %mm2) |
| 700 | dnl |
| 701 | dnl Only register->register forms are supported here, which suffices for |
| 702 | dnl the current code. |
| 703 | |
| 704 | define(psadbw, |
| 705 | m4_instruction_wrapper() |
| 706 | m4_assert_numargs(2) |
| 707 | `.byte 0x0f,0xf6,dnl |
| 708 | eval(192+x86_opcode_regmmx(`$2')*8+x86_opcode_regmmx(`$1')) dnl |
| 709 | C `psadbw $1, $2'') |
| 710 | |
| 711 | |
| 712 | dnl Usage: Zdisp(inst,op,op,op) |
| 713 | dnl |
| 714 | dnl Generate explicit .byte sequences if necessary to force a byte-sized |
| 715 | dnl zero displacement on an instruction. For example, |
| 716 | dnl |
| 717 | dnl Zdisp( movl, 0,(%esi), %eax) |
| 718 | dnl |
| 719 | dnl expands to |
| 720 | dnl |
| 721 | dnl .byte 139,70,0 C movl 0(%esi), %eax |
| 722 | dnl |
| 723 | dnl If the displacement given isn't 0, then normal assembler code is |
| 724 | dnl generated. For example, |
| 725 | dnl |
| 726 | dnl Zdisp( movl, 4,(%esi), %eax) |
| 727 | dnl |
| 728 | dnl expands to |
| 729 | dnl |
| 730 | dnl movl 4(%esi), %eax |
| 731 | dnl |
| 732 | dnl This means a single Zdisp() form can be used with an expression for the |
| 733 | dnl displacement, and .byte will be used only if necessary. The |
| 734 | dnl displacement argument is eval()ed. |
| 735 | dnl |
| 736 | dnl Because there aren't many places a 0(reg) form is wanted, Zdisp is |
| 737 | dnl implemented with a table of instructions and encodings. A new entry is |
| 738 | dnl needed for any different operation or registers. The table is split |
| 739 | dnl into separate macros to avoid overflowing BSD m4 macro expansion space. |
| 740 | |
| 741 | define(Zdisp, |
| 742 | m4_assert_numargs(4) |
| 743 | `define(`Zdisp_found',0)dnl |
| 744 | Zdisp_1($@)dnl |
| 745 | Zdisp_2($@)dnl |
| 746 | Zdisp_3($@)dnl |
| 747 | Zdisp_4($@)dnl |
| 748 | ifelse(Zdisp_found,0, |
| 749 | `m4_error(`unrecognised instruction in Zdisp: $1 $2 $3 $4 |
| 750 | ')')') |
| 751 | |
| 752 | define(Zdisp_1,`dnl |
| 753 | Zdisp_match( adcl, 0,(%edx), %eax, `0x13,0x42,0x00', $@)`'dnl |
| 754 | Zdisp_match( adcl, 0,(%edx), %ebx, `0x13,0x5a,0x00', $@)`'dnl |
| 755 | Zdisp_match( adcl, 0,(%edx), %esi, `0x13,0x72,0x00', $@)`'dnl |
| 756 | Zdisp_match( addl, %ebx, 0,(%edi), `0x01,0x5f,0x00', $@)`'dnl |
| 757 | Zdisp_match( addl, %ecx, 0,(%edi), `0x01,0x4f,0x00', $@)`'dnl |
| 758 | Zdisp_match( addl, %esi, 0,(%edi), `0x01,0x77,0x00', $@)`'dnl |
| 759 | Zdisp_match( sbbl, 0,(%edx), %eax, `0x1b,0x42,0x00', $@)`'dnl |
| 760 | Zdisp_match( sbbl, 0,(%edx), %esi, `0x1b,0x72,0x00', $@)`'dnl |
| 761 | Zdisp_match( subl, %ecx, 0,(%edi), `0x29,0x4f,0x00', $@)`'dnl |
| 762 | Zdisp_match( movzbl, 0,(%eax,%ebp), %eax, `0x0f,0xb6,0x44,0x28,0x00', $@)`'dnl |
| 763 | Zdisp_match( movzbl, 0,(%ecx,%edi), %edi, `0x0f,0xb6,0x7c,0x39,0x00', $@)`'dnl |
| 764 | Zdisp_match( adc, 0,(%ebx,%ecx,4), %eax, `0x13,0x44,0x8b,0x00', $@)`'dnl |
| 765 | Zdisp_match( sbb, 0,(%ebx,%ecx,4), %eax, `0x1b,0x44,0x8b,0x00', $@)`'dnl |
| 766 | ') |
| 767 | define(Zdisp_2,`dnl |
| 768 | Zdisp_match( movl, %eax, 0,(%edi), `0x89,0x47,0x00', $@)`'dnl |
| 769 | Zdisp_match( movl, %ebx, 0,(%edi), `0x89,0x5f,0x00', $@)`'dnl |
| 770 | Zdisp_match( movl, %esi, 0,(%edi), `0x89,0x77,0x00', $@)`'dnl |
| 771 | Zdisp_match( movl, 0,(%ebx), %eax, `0x8b,0x43,0x00', $@)`'dnl |
| 772 | Zdisp_match( movl, 0,(%ebx), %esi, `0x8b,0x73,0x00', $@)`'dnl |
| 773 | Zdisp_match( movl, 0,(%edx), %eax, `0x8b,0x42,0x00', $@)`'dnl |
| 774 | Zdisp_match( movl, 0,(%esi), %eax, `0x8b,0x46,0x00', $@)`'dnl |
| 775 | Zdisp_match( movl, 0,(%esi,%ecx,4), %eax, `0x8b,0x44,0x8e,0x00', $@)`'dnl |
| 776 | Zdisp_match( mov, 0,(%esi,%ecx,4), %eax, `0x8b,0x44,0x8e,0x00', $@)`'dnl |
| 777 | Zdisp_match( mov, %eax, 0,(%edi,%ecx,4), `0x89,0x44,0x8f,0x00', $@)`'dnl |
| 778 | ') |
| 779 | define(Zdisp_3,`dnl |
| 780 | Zdisp_match( movq, 0,(%eax,%ecx,8), %mm0, `0x0f,0x6f,0x44,0xc8,0x00', $@)`'dnl |
| 781 | Zdisp_match( movq, 0,(%ebx,%eax,4), %mm0, `0x0f,0x6f,0x44,0x83,0x00', $@)`'dnl |
| 782 | Zdisp_match( movq, 0,(%ebx,%eax,4), %mm2, `0x0f,0x6f,0x54,0x83,0x00', $@)`'dnl |
| 783 | Zdisp_match( movq, 0,(%ebx,%ecx,4), %mm0, `0x0f,0x6f,0x44,0x8b,0x00', $@)`'dnl |
| 784 | Zdisp_match( movq, 0,(%edx), %mm0, `0x0f,0x6f,0x42,0x00', $@)`'dnl |
| 785 | Zdisp_match( movq, 0,(%esi), %mm0, `0x0f,0x6f,0x46,0x00', $@)`'dnl |
| 786 | Zdisp_match( movq, %mm0, 0,(%edi), `0x0f,0x7f,0x47,0x00', $@)`'dnl |
| 787 | Zdisp_match( movq, %mm2, 0,(%ecx,%eax,4), `0x0f,0x7f,0x54,0x81,0x00', $@)`'dnl |
| 788 | Zdisp_match( movq, %mm2, 0,(%edx,%eax,4), `0x0f,0x7f,0x54,0x82,0x00', $@)`'dnl |
| 789 | Zdisp_match( movq, %mm0, 0,(%edx,%ecx,8), `0x0f,0x7f,0x44,0xca,0x00', $@)`'dnl |
| 790 | ') |
| 791 | define(Zdisp_4,`dnl |
| 792 | Zdisp_match( movd, 0,(%eax,%ecx,4), %mm0, `0x0f,0x6e,0x44,0x88,0x00', $@)`'dnl |
| 793 | Zdisp_match( movd, 0,(%eax,%ecx,8), %mm1, `0x0f,0x6e,0x4c,0xc8,0x00', $@)`'dnl |
| 794 | Zdisp_match( movd, 0,(%edx,%ecx,8), %mm0, `0x0f,0x6e,0x44,0xca,0x00', $@)`'dnl |
| 795 | Zdisp_match( movd, %mm0, 0,(%eax,%ecx,4), `0x0f,0x7e,0x44,0x88,0x00', $@)`'dnl |
| 796 | Zdisp_match( movd, %mm0, 0,(%ecx,%eax,4), `0x0f,0x7e,0x44,0x81,0x00', $@)`'dnl |
| 797 | Zdisp_match( movd, %mm2, 0,(%ecx,%eax,4), `0x0f,0x7e,0x54,0x81,0x00', $@)`'dnl |
| 798 | Zdisp_match( movd, %mm0, 0,(%edx,%ecx,4), `0x0f,0x7e,0x44,0x8a,0x00', $@)`'dnl |
| 799 | ') |
| 800 | |
| 801 | define(Zdisp_match, |
| 802 | m4_assert_numargs(9) |
| 803 | `ifelse(eval(m4_stringequal_p(`$1',`$6') |
| 804 | && m4_stringequal_p(`$2',0) |
| 805 | && m4_stringequal_p(`$3',`$8') |
| 806 | && m4_stringequal_p(`$4',`$9')),1, |
| 807 | `define(`Zdisp_found',1)dnl |
| 808 | ifelse(eval(`$7'),0, |
| 809 | ` .byte $5 C `$1 0$3, $4'', |
| 810 | ` $6 $7$8, $9')', |
| 811 | |
| 812 | `ifelse(eval(m4_stringequal_p(`$1',`$6') |
| 813 | && m4_stringequal_p(`$2',`$7') |
| 814 | && m4_stringequal_p(`$3',0) |
| 815 | && m4_stringequal_p(`$4',`$9')),1, |
| 816 | `define(`Zdisp_found',1)dnl |
| 817 | ifelse(eval(`$8'),0, |
| 818 | ` .byte $5 C `$1 $2, 0$4'', |
| 819 | ` $6 $7, $8$9')')')') |
| 820 | |
| 821 | |
| 822 | dnl Usage: shldl(count,src,dst) |
| 823 | dnl shrdl(count,src,dst) |
| 824 | dnl shldw(count,src,dst) |
| 825 | dnl shrdw(count,src,dst) |
| 826 | dnl |
| 827 | dnl Generate a double-shift instruction, possibly omitting a %cl count |
| 828 | dnl parameter if that's what the assembler requires, as indicated by |
| 829 | dnl WANT_SHLDL_CL in config.m4. For example, |
| 830 | dnl |
| 831 | dnl shldl( %cl, %eax, %ebx) |
| 832 | dnl |
| 833 | dnl turns into either |
| 834 | dnl |
| 835 | dnl shldl %cl, %eax, %ebx |
| 836 | dnl or |
| 837 | dnl shldl %eax, %ebx |
| 838 | dnl |
| 839 | dnl Immediate counts are always passed through unchanged. For example, |
| 840 | dnl |
| 841 | dnl shrdl( $2, %esi, %edi) |
| 842 | dnl becomes |
| 843 | dnl shrdl $2, %esi, %edi |
| 844 | dnl |
| 845 | dnl |
| 846 | dnl If you forget to use the macro form "shldl( ...)" and instead write |
| 847 | dnl just a plain "shldl ...", an error results. This ensures the necessary |
| 848 | dnl variant treatment of %cl isn't accidentally bypassed. |
| 849 | |
| 850 | define(define_shd_instruction, |
| 851 | m4_assert_numargs(1) |
| 852 | `define($1, |
| 853 | m4_instruction_wrapper() |
| 854 | m4_assert_numargs(3) |
| 855 | `shd_instruction'(m4_doublequote($`'0),m4_doublequote($`'1),dnl |
| 856 | m4_doublequote($`'2),m4_doublequote($`'3)))') |
| 857 | |
| 858 | dnl Effectively: define(shldl,`shd_instruction(`$0',`$1',`$2',`$3')') etc |
| 859 | define_shd_instruction(shldl) |
| 860 | define_shd_instruction(shrdl) |
| 861 | define_shd_instruction(shldw) |
| 862 | define_shd_instruction(shrdw) |
| 863 | |
| 864 | dnl Called: shd_instruction(op,count,src,dst) |
| 865 | define(shd_instruction, |
| 866 | m4_assert_numargs(4) |
| 867 | m4_assert_defined(`WANT_SHLDL_CL') |
| 868 | `ifelse(eval(m4_stringequal_p(`$2',`%cl') && !WANT_SHLDL_CL),1, |
| 869 | ``$1' `$3', `$4'', |
| 870 | ``$1' `$2', `$3', `$4'')') |
| 871 | |
| 872 | |
| 873 | dnl Usage: ASSERT([cond][,instructions]) |
| 874 | dnl |
| 875 | dnl If WANT_ASSERT is 1, output the given instructions and expect the given |
| 876 | dnl flags condition to then be satisfied. For example, |
| 877 | dnl |
| 878 | dnl ASSERT(ne, `cmpl %eax, %ebx') |
| 879 | dnl |
| 880 | dnl The instructions can be omitted to just assert a flags condition with |
| 881 | dnl no extra calculation. For example, |
| 882 | dnl |
| 883 | dnl ASSERT(nc) |
| 884 | dnl |
| 885 | dnl When `instructions' is not empty, a pushf/popf is added to preserve the |
| 886 | dnl flags, but the instructions themselves must preserve any registers that |
| 887 | dnl matter. FRAME is adjusted for the push and pop, so the instructions |
| 888 | dnl given can use defframe() stack variables. |
| 889 | dnl |
| 890 | dnl The condition can be omitted to just output the given instructions when |
| 891 | dnl assertion checking is wanted. In this case the pushf/popf is omitted. |
| 892 | dnl For example, |
| 893 | dnl |
| 894 | dnl ASSERT(, `movl %eax, VAR_KEEPVAL') |
| 895 | |
| 896 | define(ASSERT, |
| 897 | m4_assert_numargs_range(1,2) |
| 898 | m4_assert_defined(`WANT_ASSERT') |
| 899 | `ifelse(WANT_ASSERT,1, |
| 900 | `ifelse(`$1',, |
| 901 | `$2', |
| 902 | `C ASSERT |
| 903 | ifelse(`$2',,,` pushf ifdef(`FRAME',`FRAME_pushl()')') |
| 904 | $2 |
| 905 | j`$1' L(ASSERT_ok`'ASSERT_counter) |
| 906 | ud2 C assertion failed |
| 907 | L(ASSERT_ok`'ASSERT_counter): |
| 908 | ifelse(`$2',,,` popf ifdef(`FRAME',`FRAME_popl()')') |
| 909 | define(`ASSERT_counter',incr(ASSERT_counter))')')') |
| 910 | |
| 911 | define(ASSERT_counter,1) |
| 912 | |
| 913 | |
| 914 | dnl Usage: movl_text_address(label,register) |
| 915 | dnl |
| 916 | dnl Get the address of a text segment label, using either a plain movl or a |
| 917 | dnl position-independent calculation, as necessary. For example, |
| 918 | dnl |
| 919 | dnl movl_code_address(L(foo),%eax) |
| 920 | dnl |
| 921 | dnl This macro is only meant for use in ASSERT()s or when testing, since |
| 922 | dnl the PIC sequence it generates will want to be done with a ret balancing |
| 923 | dnl the call on CPUs with return address branch prediction. |
| 924 | dnl |
| 925 | dnl The addl generated here has a backward reference to the label, and so |
| 926 | dnl won't suffer from the two forwards references bug in old gas (described |
| 927 | dnl in mpn/x86/README). |
| 928 | |
| 929 | define(movl_text_address, |
| 930 | m4_assert_numargs(2) |
| 931 | `ifdef(`PIC', |
| 932 | `call L(movl_text_address_`'movl_text_address_counter) |
| 933 | L(movl_text_address_`'movl_text_address_counter): |
| 934 | popl $2 C %eip |
| 935 | addl `$'$1-L(movl_text_address_`'movl_text_address_counter), $2 |
| 936 | define(`movl_text_address_counter',incr(movl_text_address_counter))', |
| 937 | `movl `$'$1, $2')') |
| 938 | |
| 939 | define(movl_text_address_counter,1) |
| 940 | |
| 941 | |
| 942 | dnl Usage: notl_or_xorl_GMP_NUMB_MASK(reg) |
| 943 | dnl |
| 944 | dnl Expand to either "notl `reg'" or "xorl $GMP_NUMB_BITS,`reg'" as |
| 945 | dnl appropriate for nails in use or not. |
| 946 | |
| 947 | define(notl_or_xorl_GMP_NUMB_MASK, |
| 948 | m4_assert_numargs(1) |
| 949 | `ifelse(GMP_NAIL_BITS,0, |
| 950 | `notl `$1'', |
| 951 | `xorl $GMP_NUMB_MASK, `$1'')') |
| 952 | |
| 953 | |
| 954 | dnl Usage LEA(symbol,reg) |
| 955 | dnl Usage LEAL(symbol_local_to_file,reg) |
| 956 | |
| 957 | define(`LEA', |
| 958 | m4_assert_numargs(2) |
| 959 | `ifdef(`PIC',`dnl |
| 960 | ifelse(index(defn(`load_eip'), `$2'),-1, |
| 961 | `m4append(`load_eip', |
| 962 | ` TEXT |
| 963 | ALIGN(16) |
| 964 | L(movl_eip_`'substr($2,1)): |
| 965 | movl (%esp), $2 |
| 966 | ret_internal |
| 967 | ')')dnl |
| 968 | call L(movl_eip_`'substr($2,1)) |
| 969 | addl $_GLOBAL_OFFSET_TABLE_, $2 |
| 970 | movl $1@GOT($2), $2 |
| 971 | ',` |
| 972 | movl `$'$1, $2 |
| 973 | ')') |
| 974 | |
| 975 | define(`LEAL', |
| 976 | m4_assert_numargs(2) |
| 977 | `ifdef(`PIC',`dnl |
| 978 | ifelse(index(defn(`load_eip'), `$2'),-1, |
| 979 | `m4append(`load_eip', |
| 980 | ` TEXT |
| 981 | ALIGN(16) |
| 982 | L(movl_eip_`'substr($2,1)): |
| 983 | movl (%esp), $2 |
| 984 | ret_internal |
| 985 | ')')dnl |
| 986 | call L(movl_eip_`'substr($2,1)) |
| 987 | addl $_GLOBAL_OFFSET_TABLE_, $2 |
| 988 | leal $1@GOTOFF($2), $2 |
| 989 | ',` |
| 990 | movl `$'$1, $2 |
| 991 | ')') |
| 992 | |
| 993 | dnl ASM_END |
| 994 | |
| 995 | define(`ASM_END',`load_eip') |
| 996 | |
| 997 | define(`load_eip', `') dnl updated in LEA/LEAL |
| 998 | |
| 999 | |
| 1000 | define(`DEF_OBJECT', |
| 1001 | m4_assert_numargs_range(1,2) |
| 1002 | `RODATA |
| 1003 | ALIGN(ifelse($#,1,2,$2)) |
| 1004 | $1: |
| 1005 | ') |
| 1006 | |
| 1007 | define(`END_OBJECT', |
| 1008 | m4_assert_numargs(1) |
| 1009 | ` SIZE(`$1',.-`$1')') |
| 1010 | |
| 1011 | dnl Usage: CALL(funcname) |
| 1012 | dnl |
| 1013 | |
| 1014 | define(`CALL', |
| 1015 | m4_assert_numargs(1) |
| 1016 | `ifdef(`PIC', |
| 1017 | `call GSYM_PREFIX`'$1@PLT', |
| 1018 | `call GSYM_PREFIX`'$1')') |
| 1019 | |
| 1020 | ifdef(`PIC', |
| 1021 | `define(`PIC_WITH_EBX')', |
| 1022 | `undefine(`PIC_WITH_EBX')') |
| 1023 | |
| 1024 | divert`'dnl |