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/* $OpenBSD: simm13.c,v 1.5 2003/08/19 19:24:07 jason Exp $ */
/*
* Copyright (c) 2003 Jason L. Wright (jason@thought.net)
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
/*
* check that "popc immediate, %rd" gets the correct value. It is
* emulated on most SPARC v9 implementations.
*/
#include <sys/types.h>
#include <sys/mman.h>
#include <machine/instr.h>
#include <err.h>
#include <stdio.h>
#define SIGN_EXT13(v) (((int64_t)(v) << 51) >> 51)
void gen_simm(u_int32_t *, int);
int64_t a_popc_imm(void *, int);
int64_t c_popc(int64_t);
int main(void);
void
gen_simm(u_int32_t *p, int imm)
{
/*
* generate the following asm, and flush the pipeline
* retl
* popc imm, %o0
*/
p[0] = I_JMPLri(I_G0, I_O7, 8);
__asm __volatile("iflush %0+0" : : "r" (p + 0));
p[1] = _I_OP3_R_RI(I_O0, IOP3_POPC, I_G0, imm);
__asm __volatile("iflush %0+0" : : "r" (p + 1));
__asm __volatile("nop;nop;nop;nop;nop");
}
int64_t
a_popc_imm(void *v, int i)
{
int64_t (*func)(void) = v, r;
if (mprotect(v, 2 * sizeof(union instr), PROT_READ|PROT_WRITE) == -1)
err(1, "mprotect");
gen_simm(v, i);
if (mprotect(v, 2 * sizeof(union instr), PROT_READ|PROT_EXEC) == -1)
err(1, "mprotect");
r = (*func)();
if (mprotect(v, 2 * sizeof(union instr), PROT_NONE) == -1)
err(1, "mprotect");
return (r);
}
int64_t
c_popc(int64_t v)
{
int64_t bit, r;
for (bit = 1, r = 0; bit; bit <<= 1)
if (v & bit)
r++;
return (r);
}
int
main()
{
void *v;
int i, a, c;
int r = 0;
v = mmap(NULL, 2 * sizeof(union instr), PROT_NONE, MAP_ANON, -1, 0);
if (v == MAP_FAILED)
err(1, "mmap");
for (i = -4096; i <= 4095; i++) {
a = a_popc_imm(v, i);
c = c_popc(SIGN_EXT13(i));
if (c != a) {
printf("BAD: %d: asm %d, c %d\n", i, a, c);
r = 1;
}
}
return (r);
}
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