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/*
* Copyright(c) 2019-2021 Qualcomm Innovation Center, Inc. All Rights Reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#include <stdio.h>
static inline int preg_alias(int v0, int v1, int v2, int v3)
{
int ret;
asm volatile("p0 = %1\n\t"
"p1 = %2\n\t"
"p2 = %3\n\t"
"p3 = %4\n\t"
"%0 = C4\n"
: "=r"(ret)
: "r"(v0), "r"(v1), "r"(v2), "r"(v3)
: "p0", "p1", "p2", "p3");
return ret;
}
static inline int preg_alias_pair(int v0, int v1, int v2, int v3)
{
long long c54;
asm volatile("p0 = %1\n\t"
"p1 = %2\n\t"
"p2 = %3\n\t"
"p3 = %4\n\t"
"%0 = C5:4\n"
: "=r"(c54)
: "r"(v0), "r"(v1), "r"(v2), "r"(v3)
: "p0", "p1", "p2", "p3");
return (int)c54;
}
typedef union {
int creg;
struct {
unsigned char p0;
unsigned char p1;
unsigned char p2;
unsigned char p3;
} pregs;
} PRegs;
static inline void creg_alias(int cval, PRegs *pregs)
{
unsigned char val;
asm volatile("c4 = %0" : : "r"(cval));
asm volatile("%0 = p0" : "=r"(val));
pregs->pregs.p0 = val;
asm volatile("%0 = p1" : "=r"(val));
pregs->pregs.p1 = val;
asm volatile("%0 = p2" : "=r"(val));
pregs->pregs.p2 = val;
asm volatile("%0 = p3" : "=r"(val));
pregs->pregs.p3 = val;
}
int err;
static void check(int val, int expect)
{
if (val != expect) {
printf("ERROR: 0x%08x != 0x%08x\n", val, expect);
err++;
}
}
static inline void creg_alias_pair(unsigned int cval, PRegs *pregs)
{
unsigned long long cval_pair = (0xdeadbeefULL << 32) | cval;
unsigned char val;
int c5;
asm volatile("c5:4 = %0" : : "r"(cval_pair));
asm volatile("%0 = p0" : "=r"(val));
pregs->pregs.p0 = val;
asm volatile("%0 = p1" : "=r"(val));
pregs->pregs.p1 = val;
asm volatile("%0 = p2" : "=r"(val));
pregs->pregs.p2 = val;
asm volatile("%0 = p3" : "=r"(val));
pregs->pregs.p3 = val;
asm volatile("%0 = c5" : "=r"(c5));
check(c5, 0xdeadbeef);
}
int main()
{
int c4;
PRegs pregs;
c4 = preg_alias(0xff, 0x00, 0xff, 0x00);
check(c4, 0x00ff00ff);
c4 = preg_alias(0xff, 0x00, 0x00, 0x00);
check(c4, 0x000000ff);
c4 = preg_alias(0x00, 0xff, 0x00, 0x00);
check(c4, 0x0000ff00);
c4 = preg_alias(0x00, 0x00, 0xff, 0x00);
check(c4, 0x00ff0000);
c4 = preg_alias(0x00, 0x00, 0x00, 0xff);
check(c4, 0xff000000);
c4 = preg_alias(0xff, 0xff, 0xff, 0xff);
check(c4, 0xffffffff);
c4 = preg_alias_pair(0xff, 0x00, 0xff, 0x00);
check(c4, 0x00ff00ff);
c4 = preg_alias_pair(0xff, 0x00, 0x00, 0x00);
check(c4, 0x000000ff);
c4 = preg_alias_pair(0x00, 0xff, 0x00, 0x00);
check(c4, 0x0000ff00);
c4 = preg_alias_pair(0x00, 0x00, 0xff, 0x00);
check(c4, 0x00ff0000);
c4 = preg_alias_pair(0x00, 0x00, 0x00, 0xff);
check(c4, 0xff000000);
c4 = preg_alias_pair(0xff, 0xff, 0xff, 0xff);
check(c4, 0xffffffff);
creg_alias(0x00ff00ff, &pregs);
check(pregs.creg, 0x00ff00ff);
creg_alias(0x00ffff00, &pregs);
check(pregs.creg, 0x00ffff00);
creg_alias(0x00000000, &pregs);
check(pregs.creg, 0x00000000);
creg_alias(0xff000000, &pregs);
check(pregs.creg, 0xff000000);
creg_alias(0x00ff0000, &pregs);
check(pregs.creg, 0x00ff0000);
creg_alias(0x0000ff00, &pregs);
check(pregs.creg, 0x0000ff00);
creg_alias(0x000000ff, &pregs);
check(pregs.creg, 0x000000ff);
creg_alias(0xffffffff, &pregs);
check(pregs.creg, 0xffffffff);
creg_alias_pair(0x00ff00ff, &pregs);
check(pregs.creg, 0x00ff00ff);
creg_alias_pair(0x00ffff00, &pregs);
check(pregs.creg, 0x00ffff00);
creg_alias_pair(0x00000000, &pregs);
check(pregs.creg, 0x00000000);
creg_alias_pair(0xff000000, &pregs);
check(pregs.creg, 0xff000000);
creg_alias_pair(0x00ff0000, &pregs);
check(pregs.creg, 0x00ff0000);
creg_alias_pair(0x0000ff00, &pregs);
check(pregs.creg, 0x0000ff00);
creg_alias_pair(0x000000ff, &pregs);
check(pregs.creg, 0x000000ff);
creg_alias_pair(0xffffffff, &pregs);
check(pregs.creg, 0xffffffff);
puts(err ? "FAIL" : "PASS");
return err;
}
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