| divert(-1) |
| |
| dnl m4 macros for x86 assembler. |
| |
| dnl Copyright 1999-2003, 2007, 2010, 2012, 2014 Free Software Foundation, Inc. |
| |
| dnl This file is part of the GNU MP Library. |
| dnl |
| dnl The GNU MP Library is free software; you can redistribute it and/or modify |
| dnl it under the terms of either: |
| dnl |
| dnl * the GNU Lesser General Public License as published by the Free |
| dnl Software Foundation; either version 3 of the License, or (at your |
| dnl option) any later version. |
| dnl |
| dnl or |
| dnl |
| dnl * the GNU General Public License as published by the Free Software |
| dnl Foundation; either version 2 of the License, or (at your option) any |
| dnl later version. |
| dnl |
| dnl or both in parallel, as here. |
| dnl |
| dnl The GNU MP Library is distributed in the hope that it will be useful, but |
| dnl WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY |
| dnl or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| dnl for more details. |
| dnl |
| dnl You should have received copies of the GNU General Public License and the |
| dnl GNU Lesser General Public License along with the GNU MP Library. If not, |
| dnl see https://www.gnu.org/licenses/. |
| |
| |
| dnl Notes: |
| dnl |
| dnl m4 isn't perfect for processing BSD style x86 assembler code, the main |
| dnl problems are, |
| dnl |
| dnl 1. Doing define(foo,123) and then using foo in an addressing mode like |
| dnl foo(%ebx) expands as a macro rather than a constant. This is worked |
| dnl around by using deflit() from asm-defs.m4, instead of define(). |
| dnl |
| dnl 2. Immediates in macro definitions need a space or `' to stop the $ |
| dnl looking like a macro parameter. For example, |
| dnl |
| dnl define(foo, `mov $ 123, %eax') |
| dnl |
| dnl This is only a problem in macro definitions, not in ordinary text, |
| dnl and not in macro parameters like text passed to forloop() or ifdef(). |
| |
| |
| deflit(GMP_LIMB_BYTES, 4) |
| |
| |
| dnl Libtool gives -DPIC -DDLL_EXPORT to indicate a cygwin or mingw DLL. We |
| dnl undefine PIC since we don't need to be position independent in this |
| dnl case and definitely don't want the ELF style _GLOBAL_OFFSET_TABLE_ etc. |
| |
| ifdef(`DLL_EXPORT',`undefine(`PIC')') |
| |
| |
| dnl Usage: CPUVEC_FUNCS_LIST |
| dnl |
| dnl A list of the functions from gmp-impl.h x86 struct cpuvec_t, in the |
| dnl order they appear in that structure. |
| |
| define(CPUVEC_FUNCS_LIST, |
| ``add_n', |
| `addlsh1_n', |
| `addlsh2_n', |
| `addmul_1', |
| `addmul_2', |
| `bdiv_dbm1c', |
| `cnd_add_n', |
| `cnd_sub_n', |
| `com', |
| `copyd', |
| `copyi', |
| `divexact_1', |
| `divrem_1', |
| `gcd_11', |
| `lshift', |
| `lshiftc', |
| `mod_1', |
| `mod_1_1p', |
| `mod_1_1p_cps', |
| `mod_1s_2p', |
| `mod_1s_2p_cps', |
| `mod_1s_4p', |
| `mod_1s_4p_cps', |
| `mod_34lsub1', |
| `modexact_1c_odd', |
| `mul_1', |
| `mul_basecase', |
| `mullo_basecase', |
| `preinv_divrem_1', |
| `preinv_mod_1', |
| `redc_1', |
| `redc_2', |
| `rshift', |
| `sqr_basecase', |
| `sub_n', |
| `sublsh1_n', |
| `submul_1'') |
| |
| |
| dnl Called: PROLOGUE_cpu(GSYM_PREFIX`'foo) |
| dnl |
| dnl In the x86 code we use explicit TEXT and ALIGN() calls in the code, |
| dnl since different alignments are wanted in various circumstances. So for |
| dnl instance, |
| dnl |
| dnl TEXT |
| dnl ALIGN(16) |
| dnl PROLOGUE(mpn_add_n) |
| dnl ... |
| dnl EPILOGUE() |
| |
| define(`PROLOGUE_cpu', |
| m4_assert_numargs(1) |
| m4_assert_defined(`WANT_PROFILING') |
| `GLOBL $1 |
| TYPE($1,`function') |
| COFF_TYPE($1) |
| $1: |
| ifelse(WANT_PROFILING,`prof', ` call_mcount') |
| ifelse(WANT_PROFILING,`gprof', ` call_mcount') |
| ifelse(WANT_PROFILING,`instrument',` call_instrument(enter)') |
| ') |
| |
| |
| dnl Usage: COFF_TYPE(GSYM_PREFIX`'foo) |
| dnl |
| dnl Emit COFF style ".def ... .endef" type information for a function, when |
| dnl supported. The argument should include any GSYM_PREFIX. |
| dnl |
| dnl See autoconf macro GMP_ASM_COFF_TYPE for HAVE_COFF_TYPE. |
| |
| define(COFF_TYPE, |
| m4_assert_numargs(1) |
| m4_assert_defined(`HAVE_COFF_TYPE') |
| `ifelse(HAVE_COFF_TYPE,yes, |
| `.def $1 |
| .scl 2 |
| .type 32 |
| .endef')') |
| |
| |
| dnl Usage: call_mcount |
| dnl |
| dnl For `gprof' style profiling, %ebp is setup as a frame pointer. None of |
| dnl the assembler routines use %ebp this way, so it's done only for the |
| dnl benefit of mcount. glibc sysdeps/i386/i386-mcount.S shows how mcount |
| dnl gets the current function from (%esp) and the parent from 4(%ebp). |
| dnl |
| dnl For `prof' style profiling gcc generates mcount calls without setting |
| dnl up %ebp, and the same is done here. |
| |
| define(`call_mcount', |
| m4_assert_numargs(-1) |
| m4_assert_defined(`WANT_PROFILING') |
| m4_assert_defined(`MCOUNT_PIC_REG') |
| m4_assert_defined(`MCOUNT_NONPIC_REG') |
| m4_assert_defined(`MCOUNT_PIC_CALL') |
| m4_assert_defined(`MCOUNT_NONPIC_CALL') |
| `ifelse(ifdef(`PIC',`MCOUNT_PIC_REG',`MCOUNT_NONPIC_REG'),,, |
| ` DATA |
| ALIGN(4) |
| L(mcount_data_`'mcount_counter): |
| W32 0 |
| TEXT |
| ')dnl |
| ifelse(WANT_PROFILING,`gprof', |
| ` pushl %ebp |
| movl %esp, %ebp |
| ')dnl |
| ifdef(`PIC', |
| ` pushl %ebx |
| call_movl_eip_to_ebx |
| L(mcount_here_`'mcount_counter): |
| addl $_GLOBAL_OFFSET_TABLE_+[.-L(mcount_here_`'mcount_counter)], %ebx |
| ifelse(MCOUNT_PIC_REG,,, |
| ` leal L(mcount_data_`'mcount_counter)@GOTOFF(%ebx), MCOUNT_PIC_REG') |
| MCOUNT_PIC_CALL |
| popl %ebx |
| ',`dnl non-PIC |
| ifelse(MCOUNT_NONPIC_REG,,, |
| ` movl `$'L(mcount_data_`'mcount_counter), MCOUNT_NONPIC_REG |
| ')dnl |
| MCOUNT_NONPIC_CALL |
| ')dnl |
| ifelse(WANT_PROFILING,`gprof', |
| ` popl %ebp |
| ') |
| define(`mcount_counter',incr(mcount_counter)) |
| ') |
| |
| define(mcount_counter,1) |
| |
| |
| dnl Usage: call_instrument(enter|exit) |
| dnl |
| dnl Call __cyg_profile_func_enter or __cyg_profile_func_exit. |
| dnl |
| dnl For PIC, most routines don't require _GLOBAL_OFFSET_TABLE_ themselves |
| dnl so %ebx is just setup for these calls. It's a bit wasteful to repeat |
| dnl the setup for the exit call having done it earlier for the enter, but |
| dnl there's nowhere very convenient to hold %ebx through the length of a |
| dnl routine, in general. |
| dnl |
| dnl For PIC, because instrument_current_function will be within the current |
| dnl object file we can get it just as an offset from %eip, there's no need |
| dnl to use the GOT. |
| dnl |
| dnl No attempt is made to maintain the stack alignment gcc generates with |
| dnl -mpreferred-stack-boundary. This wouldn't be hard, but it seems highly |
| dnl unlikely the instrumenting functions would be doing anything that'd |
| dnl benefit from alignment, in particular they're unlikely to be using |
| dnl doubles or long doubles on the stack. |
| dnl |
| dnl The FRAME scheme is used to conveniently account for the register saves |
| dnl before accessing the return address. Any previous value is saved and |
| dnl restored, since plenty of code keeps a value across a "ret" in the |
| dnl middle of a routine. |
| |
| define(call_instrument, |
| m4_assert_numargs(1) |
| ` pushdef(`FRAME',0) |
| ifelse($1,exit, |
| ` pushl %eax FRAME_pushl() C return value |
| ') |
| ifdef(`PIC', |
| ` pushl %ebx FRAME_pushl() |
| call_movl_eip_to_ebx |
| L(instrument_here_`'instrument_count): |
| movl %ebx, %ecx |
| addl $_GLOBAL_OFFSET_TABLE_+[.-L(instrument_here_`'instrument_count)], %ebx |
| C use addl rather than leal to avoid old gas bugs, see mpn/x86/README |
| addl $instrument_current_function-L(instrument_here_`'instrument_count), %ecx |
| pushl m4_empty_if_zero(FRAME)(%esp) FRAME_pushl() C return addr |
| pushl %ecx FRAME_pushl() C this function |
| call GSYM_PREFIX`'__cyg_profile_func_$1@PLT |
| addl $`'8, %esp |
| popl %ebx |
| ', |
| ` C non-PIC |
| pushl m4_empty_if_zero(FRAME)(%esp) FRAME_pushl() C return addr |
| pushl $instrument_current_function FRAME_pushl() C this function |
| call GSYM_PREFIX`'__cyg_profile_func_$1 |
| addl $`'8, %esp |
| ') |
| ifelse($1,exit, |
| ` popl %eax C return value |
| ') |
| popdef(`FRAME') |
| define(`instrument_count',incr(instrument_count)) |
| ') |
| define(instrument_count,1) |
| |
| |
| dnl Usage: instrument_current_function |
| dnl |
| dnl Return the current function name for instrumenting purposes. This is |
| dnl PROLOGUE_current_function, but it sticks at the first such name seen. |
| dnl |
| dnl Sticking to the first name seen ensures that multiple-entrypoint |
| dnl functions like mpn_add_nc and mpn_add_n will make enter and exit calls |
| dnl giving the same function address. |
| |
| define(instrument_current_function, |
| m4_assert_numargs(-1) |
| `ifdef(`instrument_current_function_seen', |
| `instrument_current_function_seen', |
| `define(`instrument_current_function_seen',PROLOGUE_current_function)dnl |
| PROLOGUE_current_function')') |
| |
| |
| dnl Usage: call_movl_eip_to_ebx |
| dnl |
| dnl Generate a call to L(movl_eip_to_ebx), and record the need for that |
| dnl routine. |
| |
| define(call_movl_eip_to_ebx, |
| m4_assert_numargs(-1) |
| `call L(movl_eip_to_ebx) |
| define(`movl_eip_to_ebx_needed',1)') |
| |
| dnl Usage: generate_movl_eip_to_ebx |
| dnl |
| dnl Emit a L(movl_eip_to_ebx) routine, if needed and not already generated. |
| |
| define(generate_movl_eip_to_ebx, |
| m4_assert_numargs(-1) |
| `ifelse(movl_eip_to_ebx_needed,1, |
| `ifelse(movl_eip_to_ebx_done,1,, |
| `L(movl_eip_to_ebx): |
| movl (%esp), %ebx |
| ret_internal |
| define(`movl_eip_to_ebx_done',1) |
| ')')') |
| |
| |
| dnl Usage: ret |
| dnl |
| dnl Generate a "ret", but if doing instrumented profiling then call |
| dnl __cyg_profile_func_exit first. |
| |
| define(ret, |
| m4_assert_numargs(-1) |
| m4_assert_defined(`WANT_PROFILING') |
| `ifelse(WANT_PROFILING,instrument, |
| `ret_instrument', |
| `ret_internal') |
| generate_movl_eip_to_ebx |
| ') |
| |
| |
| dnl Usage: ret_internal |
| dnl |
| dnl A plain "ret", without any __cyg_profile_func_exit call. This can be |
| dnl used for a return which is internal to some function, such as when |
| dnl getting %eip for PIC. |
| |
| define(ret_internal, |
| m4_assert_numargs(-1) |
| ``ret'') |
| |
| |
| dnl Usage: ret_instrument |
| dnl |
| dnl Generate call to __cyg_profile_func_exit and then a ret. If a ret has |
| dnl already been seen from this function then jump to that chunk of code, |
| dnl rather than emitting it again. |
| |
| define(ret_instrument, |
| m4_assert_numargs(-1) |
| `ifelse(m4_unquote(ret_instrument_seen_`'instrument_current_function),1, |
| `jmp L(instrument_exit_`'instrument_current_function)', |
| `define(ret_instrument_seen_`'instrument_current_function,1) |
| L(instrument_exit_`'instrument_current_function): |
| call_instrument(exit) |
| ret_internal')') |
| |
| |
| dnl Usage: _GLOBAL_OFFSET_TABLE_ |
| dnl |
| dnl Expand to _GLOBAL_OFFSET_TABLE_ plus any necessary underscore prefix. |
| dnl This lets us write plain _GLOBAL_OFFSET_TABLE_ in SVR4 style, but still |
| dnl work with systems requiring an extra underscore such as OpenBSD. |
| dnl |
| dnl deflit is used so "leal _GLOBAL_OFFSET_TABLE_(%eax), %ebx" will come |
| dnl out right, though that form doesn't work properly in gas (see |
| dnl mpn/x86/README). |
| |
| deflit(_GLOBAL_OFFSET_TABLE_, |
| m4_assert_defined(`GOT_GSYM_PREFIX') |
| `GOT_GSYM_PREFIX`_GLOBAL_OFFSET_TABLE_'') |
| |
| |
| dnl -------------------------------------------------------------------------- |
| dnl Various x86 macros. |
| dnl |
| |
| |
| dnl Usage: ALIGN_OFFSET(bytes,offset) |
| dnl |
| dnl Align to `offset' away from a multiple of `bytes'. |
| dnl |
| dnl This is useful for testing, for example align to something very strict |
| dnl and see what effect offsets from it have, "ALIGN_OFFSET(256,32)". |
| dnl |
| dnl Generally you wouldn't execute across the padding, but it's done with |
| dnl nop's so it'll work. |
| |
| define(ALIGN_OFFSET, |
| m4_assert_numargs(2) |
| `ALIGN($1) |
| forloop(`i',1,$2,` nop |
| ')') |
| |
| |
| dnl Usage: defframe(name,offset) |
| dnl |
| dnl Make a definition like the following with which to access a parameter |
| dnl or variable on the stack. |
| dnl |
| dnl define(name,`FRAME+offset(%esp)') |
| dnl |
| dnl Actually m4_empty_if_zero(FRAME+offset) is used, which will save one |
| dnl byte if FRAME+offset is zero, by putting (%esp) rather than 0(%esp). |
| dnl Use define(`defframe_empty_if_zero_disabled',1) if for some reason the |
| dnl zero offset is wanted. |
| dnl |
| dnl The new macro also gets a check that when it's used FRAME is actually |
| dnl defined, and that the final %esp offset isn't negative, which would |
| dnl mean an attempt to access something below the current %esp. |
| dnl |
| dnl deflit() is used rather than a plain define(), so the new macro won't |
| dnl delete any following parenthesized expression. name(%edi) will come |
| dnl out say as 16(%esp)(%edi). This isn't valid assembler and should |
| dnl provoke an error, which is better than silently giving just 16(%esp). |
| dnl |
| dnl See README for more on the suggested way to access the stack frame. |
| |
| define(defframe, |
| m4_assert_numargs(2) |
| `deflit(`$1', |
| m4_assert_defined(`FRAME') |
| `defframe_check_notbelow(`$1',$2,FRAME)dnl |
| defframe_empty_if_zero(FRAME+($2))(%esp)')') |
| |
| dnl Called: defframe_empty_if_zero(expression) |
| define(defframe_empty_if_zero, |
| m4_assert_numargs(1) |
| `ifelse(defframe_empty_if_zero_disabled,1, |
| `eval($1)', |
| `m4_empty_if_zero($1)')') |
| |
| dnl Called: defframe_check_notbelow(`name',offset,FRAME) |
| define(defframe_check_notbelow, |
| m4_assert_numargs(3) |
| `ifelse(eval(($3)+($2)<0),1, |
| `m4_error(`$1 at frame offset $2 used when FRAME is only $3 bytes |
| ')')') |
| |
| |
| dnl Usage: FRAME_pushl() |
| dnl FRAME_popl() |
| dnl FRAME_addl_esp(n) |
| dnl FRAME_subl_esp(n) |
| dnl |
| dnl Adjust FRAME appropriately for a pushl or popl, or for an addl or subl |
| dnl %esp of n bytes. |
| dnl |
| dnl Using these macros is completely optional. Sometimes it makes more |
| dnl sense to put explicit deflit(`FRAME',N) forms, especially when there's |
| dnl jumps and different sequences of FRAME values need to be used in |
| dnl different places. |
| |
| define(FRAME_pushl, |
| m4_assert_numargs(0) |
| m4_assert_defined(`FRAME') |
| `deflit(`FRAME',eval(FRAME+4))') |
| |
| define(FRAME_popl, |
| m4_assert_numargs(0) |
| m4_assert_defined(`FRAME') |
| `deflit(`FRAME',eval(FRAME-4))') |
| |
| define(FRAME_addl_esp, |
| m4_assert_numargs(1) |
| m4_assert_defined(`FRAME') |
| `deflit(`FRAME',eval(FRAME-($1)))') |
| |
| define(FRAME_subl_esp, |
| m4_assert_numargs(1) |
| m4_assert_defined(`FRAME') |
| `deflit(`FRAME',eval(FRAME+($1)))') |
| |
| |
| dnl Usage: defframe_pushl(name) |
| dnl |
| dnl Do a combination FRAME_pushl() and a defframe() to name the stack |
| dnl location just pushed. This should come after a pushl instruction. |
| dnl Putting it on the same line works and avoids lengthening the code. For |
| dnl example, |
| dnl |
| dnl pushl %eax defframe_pushl(VAR_COUNTER) |
| dnl |
| dnl Notice the defframe() is done with an unquoted -FRAME thus giving its |
| dnl current value without tracking future changes. |
| |
| define(defframe_pushl, |
| m4_assert_numargs(1) |
| `FRAME_pushl()defframe(`$1',-FRAME)') |
| |
| |
| dnl -------------------------------------------------------------------------- |
| dnl Assembler instruction macros. |
| dnl |
| |
| |
| dnl Usage: emms_or_femms |
| dnl femms_available_p |
| dnl |
| dnl femms_available_p expands to 1 or 0 according to whether the AMD 3DNow |
| dnl femms instruction is available. emms_or_femms expands to femms if |
| dnl available, or emms if not. |
| dnl |
| dnl emms_or_femms is meant for use in the K6 directory where plain K6 |
| dnl (without femms) and K6-2 and K6-3 (with a slightly faster femms) are |
| dnl supported together. |
| dnl |
| dnl On K7 femms is no longer faster and is just an alias for emms, so plain |
| dnl emms may as well be used. |
| |
| define(femms_available_p, |
| m4_assert_numargs(-1) |
| `m4_ifdef_anyof_p( |
| `HAVE_HOST_CPU_k62', |
| `HAVE_HOST_CPU_k63', |
| `HAVE_HOST_CPU_athlon')') |
| |
| define(emms_or_femms, |
| m4_assert_numargs(-1) |
| `ifelse(femms_available_p,1,`femms',`emms')') |
| |
| |
| dnl Usage: femms |
| dnl |
| dnl Gas 2.9.1 which comes with FreeBSD 3.4 doesn't support femms, so the |
| dnl following is a replacement using .byte. |
| |
| define(femms, |
| m4_assert_numargs(-1) |
| `.byte 15,14 C AMD 3DNow femms') |
| |
| |
| dnl Usage: jadcl0(op) |
| dnl |
| dnl Generate a jnc/incl as a substitute for adcl $0,op. Note this isn't an |
| dnl exact replacement, since it doesn't set the flags like adcl does. |
| dnl |
| dnl This finds a use in K6 mpn_addmul_1, mpn_submul_1, mpn_mul_basecase and |
| dnl mpn_sqr_basecase because on K6 an adcl is slow, the branch |
| dnl misprediction penalty is small, and the multiply algorithm used leads |
| dnl to a carry bit on average only 1/4 of the time. |
| dnl |
| dnl jadcl0_disabled can be set to 1 to instead generate an ordinary adcl |
| dnl for comparison. For example, |
| dnl |
| dnl define(`jadcl0_disabled',1) |
| dnl |
| dnl When using a register operand, eg. "jadcl0(%edx)", the jnc/incl code is |
| dnl the same size as an adcl. This makes it possible to use the exact same |
| dnl computed jump code when testing the relative speed of the two. |
| |
| define(jadcl0, |
| m4_assert_numargs(1) |
| `ifelse(jadcl0_disabled,1, |
| `adcl $`'0, $1', |
| `jnc L(jadcl0_`'jadcl0_counter) |
| incl $1 |
| L(jadcl0_`'jadcl0_counter): |
| define(`jadcl0_counter',incr(jadcl0_counter))')') |
| |
| define(jadcl0_counter,1) |
| |
| |
| dnl Usage: x86_lookup(target, key,value, key,value, ...) |
| dnl x86_lookup_p(target, key,value, key,value, ...) |
| dnl |
| dnl Look for `target' among the `key' parameters. |
| dnl |
| dnl x86_lookup expands to the corresponding `value', or generates an error |
| dnl if `target' isn't found. |
| dnl |
| dnl x86_lookup_p expands to 1 if `target' is found, or 0 if not. |
| |
| define(x86_lookup, |
| m4_assert_numargs_range(1,999) |
| `ifelse(eval($#<3),1, |
| `m4_error(`unrecognised part of x86 instruction: $1 |
| ')', |
| `ifelse(`$1',`$2', `$3', |
| `x86_lookup(`$1',shift(shift(shift($@))))')')') |
| |
| define(x86_lookup_p, |
| m4_assert_numargs_range(1,999) |
| `ifelse(eval($#<3),1, `0', |
| `ifelse(`$1',`$2', `1', |
| `x86_lookup_p(`$1',shift(shift(shift($@))))')')') |
| |
| |
| dnl Usage: x86_opcode_reg32(reg) |
| dnl x86_opcode_reg32_p(reg) |
| dnl |
| dnl x86_opcode_reg32 expands to the standard 3 bit encoding for the given |
| dnl 32-bit register, eg. `%ebp' turns into 5. |
| dnl |
| dnl x86_opcode_reg32_p expands to 1 if reg is a valid 32-bit register, or 0 |
| dnl if not. |
| |
| define(x86_opcode_reg32, |
| m4_assert_numargs(1) |
| `x86_lookup(`$1',x86_opcode_reg32_list)') |
| |
| define(x86_opcode_reg32_p, |
| m4_assert_onearg() |
| `x86_lookup_p(`$1',x86_opcode_reg32_list)') |
| |
| define(x86_opcode_reg32_list, |
| ``%eax',0, |
| `%ecx',1, |
| `%edx',2, |
| `%ebx',3, |
| `%esp',4, |
| `%ebp',5, |
| `%esi',6, |
| `%edi',7') |
| |
| |
| dnl Usage: x86_opcode_tttn(cond) |
| dnl |
| dnl Expand to the 4-bit "tttn" field value for the given x86 branch |
| dnl condition (like `c', `ae', etc). |
| |
| define(x86_opcode_tttn, |
| m4_assert_numargs(1) |
| `x86_lookup(`$1',x86_opcode_ttn_list)') |
| |
| define(x86_opcode_tttn_list, |
| ``o', 0, |
| `no', 1, |
| `b', 2, `c', 2, `nae',2, |
| `nb', 3, `nc', 3, `ae', 3, |
| `e', 4, `z', 4, |
| `ne', 5, `nz', 5, |
| `be', 6, `na', 6, |
| `nbe', 7, `a', 7, |
| `s', 8, |
| `ns', 9, |
| `p', 10, `pe', 10, `npo',10, |
| `np', 11, `npe',11, `po', 11, |
| `l', 12, `nge',12, |
| `nl', 13, `ge', 13, |
| `le', 14, `ng', 14, |
| `nle',15, `g', 15') |
| |
| |
| dnl Usage: cmovCC(%srcreg,%dstreg) |
| dnl |
| dnl Emit a cmov instruction, using a .byte sequence, since various past |
| dnl versions of gas don't know cmov. For example, |
| dnl |
| dnl cmovz( %eax, %ebx) |
| dnl |
| dnl The source operand can only be a plain register. (m4 code implementing |
| dnl full memory addressing modes exists, believe it or not, but isn't |
| dnl currently needed and isn't included.) |
| dnl |
| dnl All the standard conditions are defined. Attempting to use one without |
| dnl the macro parentheses, such as just "cmovbe %eax, %ebx", will provoke |
| dnl an error. This protects against writing something old gas wouldn't |
| dnl understand. |
| |
| dnl Called: define_cmov_many(cond,tttn,cond,tttn,...) |
| define(define_cmov_many, |
| `ifelse(m4_length(`$1'),0,, |
| `define_cmov(`$1',`$2')define_cmov_many(shift(shift($@)))')') |
| |
| dnl Called: define_cmov(cond,tttn) |
| dnl Emit basically define(cmov<cond>,`cmov_internal(<cond>,<ttn>,`$1',`$2')') |
| define(define_cmov, |
| m4_assert_numargs(2) |
| `define(`cmov$1', |
| m4_instruction_wrapper() |
| m4_assert_numargs(2) |
| `cmov_internal'(m4_doublequote($`'0),``$2'',dnl |
| m4_doublequote($`'1),m4_doublequote($`'2)))') |
| |
| define_cmov_many(x86_opcode_tttn_list) |
| |
| dnl Called: cmov_internal(name,tttn,src,dst) |
| define(cmov_internal, |
| m4_assert_numargs(4) |
| `.byte dnl |
| 15, dnl |
| eval(64+$2), dnl |
| eval(192+8*x86_opcode_reg32(`$4')+x86_opcode_reg32(`$3')) dnl |
| C `$1 $3, $4'') |
| |
| |
| dnl Usage: x86_opcode_regmmx(reg) |
| dnl |
| dnl Validate the given mmx register, and return its number, 0 to 7. |
| |
| define(x86_opcode_regmmx, |
| m4_assert_numargs(1) |
| `x86_lookup(`$1',x86_opcode_regmmx_list)') |
| |
| define(x86_opcode_regmmx_list, |
| ``%mm0',0, |
| `%mm1',1, |
| `%mm2',2, |
| `%mm3',3, |
| `%mm4',4, |
| `%mm5',5, |
| `%mm6',6, |
| `%mm7',7') |
| |
| |
| dnl Usage: psadbw(%srcreg,%dstreg) |
| dnl |
| dnl Oldish versions of gas don't know psadbw, in particular gas 2.9.1 on |
| dnl FreeBSD 3.3 and 3.4 doesn't, so instead emit .byte sequences. For |
| dnl example, |
| dnl |
| dnl psadbw( %mm1, %mm2) |
| dnl |
| dnl Only register->register forms are supported here, which suffices for |
| dnl the current code. |
| |
| define(psadbw, |
| m4_instruction_wrapper() |
| m4_assert_numargs(2) |
| `.byte 0x0f,0xf6,dnl |
| eval(192+x86_opcode_regmmx(`$2')*8+x86_opcode_regmmx(`$1')) dnl |
| C `psadbw $1, $2'') |
| |
| |
| dnl Usage: Zdisp(inst,op,op,op) |
| dnl |
| dnl Generate explicit .byte sequences if necessary to force a byte-sized |
| dnl zero displacement on an instruction. For example, |
| dnl |
| dnl Zdisp( movl, 0,(%esi), %eax) |
| dnl |
| dnl expands to |
| dnl |
| dnl .byte 139,70,0 C movl 0(%esi), %eax |
| dnl |
| dnl If the displacement given isn't 0, then normal assembler code is |
| dnl generated. For example, |
| dnl |
| dnl Zdisp( movl, 4,(%esi), %eax) |
| dnl |
| dnl expands to |
| dnl |
| dnl movl 4(%esi), %eax |
| dnl |
| dnl This means a single Zdisp() form can be used with an expression for the |
| dnl displacement, and .byte will be used only if necessary. The |
| dnl displacement argument is eval()ed. |
| dnl |
| dnl Because there aren't many places a 0(reg) form is wanted, Zdisp is |
| dnl implemented with a table of instructions and encodings. A new entry is |
| dnl needed for any different operation or registers. The table is split |
| dnl into separate macros to avoid overflowing BSD m4 macro expansion space. |
| |
| define(Zdisp, |
| m4_assert_numargs(4) |
| `define(`Zdisp_found',0)dnl |
| Zdisp_1($@)dnl |
| Zdisp_2($@)dnl |
| Zdisp_3($@)dnl |
| Zdisp_4($@)dnl |
| ifelse(Zdisp_found,0, |
| `m4_error(`unrecognised instruction in Zdisp: $1 $2 $3 $4 |
| ')')') |
| |
| define(Zdisp_1,`dnl |
| Zdisp_match( adcl, 0,(%edx), %eax, `0x13,0x42,0x00', $@)`'dnl |
| Zdisp_match( adcl, 0,(%edx), %ebx, `0x13,0x5a,0x00', $@)`'dnl |
| Zdisp_match( adcl, 0,(%edx), %esi, `0x13,0x72,0x00', $@)`'dnl |
| Zdisp_match( addl, %ebx, 0,(%edi), `0x01,0x5f,0x00', $@)`'dnl |
| Zdisp_match( addl, %ecx, 0,(%edi), `0x01,0x4f,0x00', $@)`'dnl |
| Zdisp_match( addl, %esi, 0,(%edi), `0x01,0x77,0x00', $@)`'dnl |
| Zdisp_match( sbbl, 0,(%edx), %eax, `0x1b,0x42,0x00', $@)`'dnl |
| Zdisp_match( sbbl, 0,(%edx), %esi, `0x1b,0x72,0x00', $@)`'dnl |
| Zdisp_match( subl, %ecx, 0,(%edi), `0x29,0x4f,0x00', $@)`'dnl |
| Zdisp_match( movzbl, 0,(%eax,%ebp), %eax, `0x0f,0xb6,0x44,0x28,0x00', $@)`'dnl |
| Zdisp_match( movzbl, 0,(%ecx,%edi), %edi, `0x0f,0xb6,0x7c,0x39,0x00', $@)`'dnl |
| Zdisp_match( adc, 0,(%ebx,%ecx,4), %eax, `0x13,0x44,0x8b,0x00', $@)`'dnl |
| Zdisp_match( sbb, 0,(%ebx,%ecx,4), %eax, `0x1b,0x44,0x8b,0x00', $@)`'dnl |
| ') |
| define(Zdisp_2,`dnl |
| Zdisp_match( movl, %eax, 0,(%edi), `0x89,0x47,0x00', $@)`'dnl |
| Zdisp_match( movl, %ebx, 0,(%edi), `0x89,0x5f,0x00', $@)`'dnl |
| Zdisp_match( movl, %esi, 0,(%edi), `0x89,0x77,0x00', $@)`'dnl |
| Zdisp_match( movl, 0,(%ebx), %eax, `0x8b,0x43,0x00', $@)`'dnl |
| Zdisp_match( movl, 0,(%ebx), %esi, `0x8b,0x73,0x00', $@)`'dnl |
| Zdisp_match( movl, 0,(%edx), %eax, `0x8b,0x42,0x00', $@)`'dnl |
| Zdisp_match( movl, 0,(%esi), %eax, `0x8b,0x46,0x00', $@)`'dnl |
| Zdisp_match( movl, 0,(%esi,%ecx,4), %eax, `0x8b,0x44,0x8e,0x00', $@)`'dnl |
| Zdisp_match( mov, 0,(%esi,%ecx,4), %eax, `0x8b,0x44,0x8e,0x00', $@)`'dnl |
| Zdisp_match( mov, %eax, 0,(%edi,%ecx,4), `0x89,0x44,0x8f,0x00', $@)`'dnl |
| ') |
| define(Zdisp_3,`dnl |
| Zdisp_match( movq, 0,(%eax,%ecx,8), %mm0, `0x0f,0x6f,0x44,0xc8,0x00', $@)`'dnl |
| Zdisp_match( movq, 0,(%ebx,%eax,4), %mm0, `0x0f,0x6f,0x44,0x83,0x00', $@)`'dnl |
| Zdisp_match( movq, 0,(%ebx,%eax,4), %mm2, `0x0f,0x6f,0x54,0x83,0x00', $@)`'dnl |
| Zdisp_match( movq, 0,(%ebx,%ecx,4), %mm0, `0x0f,0x6f,0x44,0x8b,0x00', $@)`'dnl |
| Zdisp_match( movq, 0,(%edx), %mm0, `0x0f,0x6f,0x42,0x00', $@)`'dnl |
| Zdisp_match( movq, 0,(%esi), %mm0, `0x0f,0x6f,0x46,0x00', $@)`'dnl |
| Zdisp_match( movq, %mm0, 0,(%edi), `0x0f,0x7f,0x47,0x00', $@)`'dnl |
| Zdisp_match( movq, %mm2, 0,(%ecx,%eax,4), `0x0f,0x7f,0x54,0x81,0x00', $@)`'dnl |
| Zdisp_match( movq, %mm2, 0,(%edx,%eax,4), `0x0f,0x7f,0x54,0x82,0x00', $@)`'dnl |
| Zdisp_match( movq, %mm0, 0,(%edx,%ecx,8), `0x0f,0x7f,0x44,0xca,0x00', $@)`'dnl |
| ') |
| define(Zdisp_4,`dnl |
| Zdisp_match( movd, 0,(%eax,%ecx,4), %mm0, `0x0f,0x6e,0x44,0x88,0x00', $@)`'dnl |
| Zdisp_match( movd, 0,(%eax,%ecx,8), %mm1, `0x0f,0x6e,0x4c,0xc8,0x00', $@)`'dnl |
| Zdisp_match( movd, 0,(%edx,%ecx,8), %mm0, `0x0f,0x6e,0x44,0xca,0x00', $@)`'dnl |
| Zdisp_match( movd, %mm0, 0,(%eax,%ecx,4), `0x0f,0x7e,0x44,0x88,0x00', $@)`'dnl |
| Zdisp_match( movd, %mm0, 0,(%ecx,%eax,4), `0x0f,0x7e,0x44,0x81,0x00', $@)`'dnl |
| Zdisp_match( movd, %mm2, 0,(%ecx,%eax,4), `0x0f,0x7e,0x54,0x81,0x00', $@)`'dnl |
| Zdisp_match( movd, %mm0, 0,(%edx,%ecx,4), `0x0f,0x7e,0x44,0x8a,0x00', $@)`'dnl |
| ') |
| |
| define(Zdisp_match, |
| m4_assert_numargs(9) |
| `ifelse(eval(m4_stringequal_p(`$1',`$6') |
| && m4_stringequal_p(`$2',0) |
| && m4_stringequal_p(`$3',`$8') |
| && m4_stringequal_p(`$4',`$9')),1, |
| `define(`Zdisp_found',1)dnl |
| ifelse(eval(`$7'),0, |
| ` .byte $5 C `$1 0$3, $4'', |
| ` $6 $7$8, $9')', |
| |
| `ifelse(eval(m4_stringequal_p(`$1',`$6') |
| && m4_stringequal_p(`$2',`$7') |
| && m4_stringequal_p(`$3',0) |
| && m4_stringequal_p(`$4',`$9')),1, |
| `define(`Zdisp_found',1)dnl |
| ifelse(eval(`$8'),0, |
| ` .byte $5 C `$1 $2, 0$4'', |
| ` $6 $7, $8$9')')')') |
| |
| |
| dnl Usage: shldl(count,src,dst) |
| dnl shrdl(count,src,dst) |
| dnl shldw(count,src,dst) |
| dnl shrdw(count,src,dst) |
| dnl |
| dnl Generate a double-shift instruction, possibly omitting a %cl count |
| dnl parameter if that's what the assembler requires, as indicated by |
| dnl WANT_SHLDL_CL in config.m4. For example, |
| dnl |
| dnl shldl( %cl, %eax, %ebx) |
| dnl |
| dnl turns into either |
| dnl |
| dnl shldl %cl, %eax, %ebx |
| dnl or |
| dnl shldl %eax, %ebx |
| dnl |
| dnl Immediate counts are always passed through unchanged. For example, |
| dnl |
| dnl shrdl( $2, %esi, %edi) |
| dnl becomes |
| dnl shrdl $2, %esi, %edi |
| dnl |
| dnl |
| dnl If you forget to use the macro form "shldl( ...)" and instead write |
| dnl just a plain "shldl ...", an error results. This ensures the necessary |
| dnl variant treatment of %cl isn't accidentally bypassed. |
| |
| define(define_shd_instruction, |
| m4_assert_numargs(1) |
| `define($1, |
| m4_instruction_wrapper() |
| m4_assert_numargs(3) |
| `shd_instruction'(m4_doublequote($`'0),m4_doublequote($`'1),dnl |
| m4_doublequote($`'2),m4_doublequote($`'3)))') |
| |
| dnl Effectively: define(shldl,`shd_instruction(`$0',`$1',`$2',`$3')') etc |
| define_shd_instruction(shldl) |
| define_shd_instruction(shrdl) |
| define_shd_instruction(shldw) |
| define_shd_instruction(shrdw) |
| |
| dnl Called: shd_instruction(op,count,src,dst) |
| define(shd_instruction, |
| m4_assert_numargs(4) |
| m4_assert_defined(`WANT_SHLDL_CL') |
| `ifelse(eval(m4_stringequal_p(`$2',`%cl') && !WANT_SHLDL_CL),1, |
| ``$1' `$3', `$4'', |
| ``$1' `$2', `$3', `$4'')') |
| |
| |
| dnl Usage: ASSERT([cond][,instructions]) |
| dnl |
| dnl If WANT_ASSERT is 1, output the given instructions and expect the given |
| dnl flags condition to then be satisfied. For example, |
| dnl |
| dnl ASSERT(ne, `cmpl %eax, %ebx') |
| dnl |
| dnl The instructions can be omitted to just assert a flags condition with |
| dnl no extra calculation. For example, |
| dnl |
| dnl ASSERT(nc) |
| dnl |
| dnl When `instructions' is not empty, a pushf/popf is added to preserve the |
| dnl flags, but the instructions themselves must preserve any registers that |
| dnl matter. FRAME is adjusted for the push and pop, so the instructions |
| dnl given can use defframe() stack variables. |
| dnl |
| dnl The condition can be omitted to just output the given instructions when |
| dnl assertion checking is wanted. In this case the pushf/popf is omitted. |
| dnl For example, |
| dnl |
| dnl ASSERT(, `movl %eax, VAR_KEEPVAL') |
| |
| define(ASSERT, |
| m4_assert_numargs_range(1,2) |
| m4_assert_defined(`WANT_ASSERT') |
| `ifelse(WANT_ASSERT,1, |
| `ifelse(`$1',, |
| `$2', |
| `C ASSERT |
| ifelse(`$2',,,` pushf ifdef(`FRAME',`FRAME_pushl()')') |
| $2 |
| j`$1' L(ASSERT_ok`'ASSERT_counter) |
| ud2 C assertion failed |
| L(ASSERT_ok`'ASSERT_counter): |
| ifelse(`$2',,,` popf ifdef(`FRAME',`FRAME_popl()')') |
| define(`ASSERT_counter',incr(ASSERT_counter))')')') |
| |
| define(ASSERT_counter,1) |
| |
| |
| dnl Usage: movl_text_address(label,register) |
| dnl |
| dnl Get the address of a text segment label, using either a plain movl or a |
| dnl position-independent calculation, as necessary. For example, |
| dnl |
| dnl movl_code_address(L(foo),%eax) |
| dnl |
| dnl This macro is only meant for use in ASSERT()s or when testing, since |
| dnl the PIC sequence it generates will want to be done with a ret balancing |
| dnl the call on CPUs with return address branch prediction. |
| dnl |
| dnl The addl generated here has a backward reference to the label, and so |
| dnl won't suffer from the two forwards references bug in old gas (described |
| dnl in mpn/x86/README). |
| |
| define(movl_text_address, |
| m4_assert_numargs(2) |
| `ifdef(`PIC', |
| `call L(movl_text_address_`'movl_text_address_counter) |
| L(movl_text_address_`'movl_text_address_counter): |
| popl $2 C %eip |
| addl `$'$1-L(movl_text_address_`'movl_text_address_counter), $2 |
| define(`movl_text_address_counter',incr(movl_text_address_counter))', |
| `movl `$'$1, $2')') |
| |
| define(movl_text_address_counter,1) |
| |
| |
| dnl Usage: notl_or_xorl_GMP_NUMB_MASK(reg) |
| dnl |
| dnl Expand to either "notl `reg'" or "xorl $GMP_NUMB_BITS,`reg'" as |
| dnl appropriate for nails in use or not. |
| |
| define(notl_or_xorl_GMP_NUMB_MASK, |
| m4_assert_numargs(1) |
| `ifelse(GMP_NAIL_BITS,0, |
| `notl `$1'', |
| `xorl $GMP_NUMB_MASK, `$1'')') |
| |
| |
| dnl Usage LEA(symbol,reg) |
| dnl Usage LEAL(symbol_local_to_file,reg) |
| |
| define(`LEA', |
| m4_assert_numargs(2) |
| `ifdef(`PIC',`dnl |
| ifelse(index(defn(`load_eip'), `$2'),-1, |
| `m4append(`load_eip', |
| ` TEXT |
| ALIGN(16) |
| L(movl_eip_`'substr($2,1)): |
| movl (%esp), $2 |
| ret_internal |
| ')')dnl |
| call L(movl_eip_`'substr($2,1)) |
| addl $_GLOBAL_OFFSET_TABLE_, $2 |
| movl $1@GOT($2), $2 |
| ',` |
| movl `$'$1, $2 |
| ')') |
| |
| define(`LEAL', |
| m4_assert_numargs(2) |
| `ifdef(`PIC',`dnl |
| ifelse(index(defn(`load_eip'), `$2'),-1, |
| `m4append(`load_eip', |
| ` TEXT |
| ALIGN(16) |
| L(movl_eip_`'substr($2,1)): |
| movl (%esp), $2 |
| ret_internal |
| ')')dnl |
| call L(movl_eip_`'substr($2,1)) |
| addl $_GLOBAL_OFFSET_TABLE_, $2 |
| leal $1@GOTOFF($2), $2 |
| ',` |
| movl `$'$1, $2 |
| ')') |
| |
| dnl ASM_END |
| |
| define(`ASM_END',`load_eip') |
| |
| define(`load_eip', `') dnl updated in LEA/LEAL |
| |
| |
| define(`DEF_OBJECT', |
| m4_assert_numargs_range(1,2) |
| `RODATA |
| ALIGN(ifelse($#,1,2,$2)) |
| $1: |
| ') |
| |
| define(`END_OBJECT', |
| m4_assert_numargs(1) |
| ` SIZE(`$1',.-`$1')') |
| |
| dnl Usage: CALL(funcname) |
| dnl |
| |
| define(`CALL', |
| m4_assert_numargs(1) |
| `ifdef(`PIC', |
| `call GSYM_PREFIX`'$1@PLT', |
| `call GSYM_PREFIX`'$1')') |
| |
| ifdef(`PIC', |
| `define(`PIC_WITH_EBX')', |
| `undefine(`PIC_WITH_EBX')') |
| |
| divert`'dnl |