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glibc/SOURCES/power6emul.c
CentOS Sources c04956366c import glibc-2.28-158.el8
2021-09-16 08:48:07 +00:00

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/* Emulate power6 mf[tf]gpr and fri[zpmn] instructions.
Copyright (C) 2006 Red Hat, Inc.
Contributed by Jakub Jelinek <jakub@redhat.com>, 2006.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
It 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#include <signal.h>
#include <stdio.h>
extern double frip (double), friz (double), frin (double), frim (double);
asm (".globl frip, friz, frin, frim\n.hidden frip, friz, frin, frim\n\t"
#ifdef __powerpc64__
".section \".toc\",\"aw\"\n"
"8:" ".tc FD_43300000_0[TC],0x4330000000000000\n"
"9:" ".tc FD_3fe00000_0[TC],0x3fe0000000000000\n\t"
".previous\n\t"
#else
".rodata\n\t"
".align 2\n"
"8:" ".long 0x59800000\n"
"9:" ".long 0x3f000000\n\t"
".previous\n\t"
#endif
"# frip == ceil\n"
"frip:" "mffs 11\n\t"
#ifdef __powerpc64__
"lfd 13,8b@toc(2)\n\t"
#else
"mflr 11\n\t"
"bcl 20,31,1f\n"
"1:" "mflr 9\n\t"
"addis 9,9,8b-1b@ha\n\t"
"lfs 13,8b-1b@l(9)\n\t"
"mtlr 11\n\t"
#endif
"fabs 0,1\n\t"
"fsub 12,13,13\n\t"
"fcmpu 7,0,13\n\t"
"fcmpu 6,1,12\n\t"
"bnllr- 7\n\t"
"mtfsfi 7,2\n\t"
"ble- 6,2f\n\t"
"fadd 1,1,13\n\t"
"fsub 1,1,13\n\t"
"fabs 1,1\n\t"
"mtfsf 0x01,11\n\t"
"blr\n"
"2:" "bge- 6,3f\n\t"
"fsub 1,1,13\n\t"
"fadd 1,1,13\n\t"
"fnabs 1,1\n"
"3:" "mtfsf 0x01,11\n\t"
"blr\n\t"
"# friz == trunc\n"
"friz:" "mffs 11\n\t"
#ifdef __powerpc64__
"lfd 13,8b@toc(2)\n\t"
#else
"mflr 11\n\t"
"bcl 20,31,1f\n"
"1:" "mflr 9\n\t"
"addis 9,9,8b-1b@ha\n\t"
"lfs 13,8b-1b@l(9)\n\t"
"mtlr 11\n\t"
#endif
"fabs 0,1\n\t"
"fsub 12,13,13\n\t"
"fcmpu 7,0,13\n\t"
"fcmpu 6,1,12\n\t"
"bnllr- 7\n\t"
"mtfsfi 7,1\n\t"
"ble- 6,2f\n\t"
"fadd 1,1,13\n\t"
"fsub 1,1,13\n\t"
"fabs 1,1\n\t"
"mtfsf 0x01,11\n\t"
"blr\n"
"2:" "bge- 6,3f\n\t"
"fsub 1,1,13\n\t"
"fadd 1,1,13\n\t"
"fnabs 1,1\n"
"3:" "mtfsf 0x01,11\n\t"
"blr\n\t"
"# frin == round\n"
"frin:" "mffs 11\n\t"
#ifdef __powerpc64__
"lfd 13,8b@toc(2)\n\t"
#else
"mflr 11\n\t"
"bcl 20,31,1f\n"
"1:" "mflr 9\n\t"
"addis 9,9,8b-1b@ha\n\t"
"addi 9,9,8b-1b@l\n\t"
"mtlr 11\n\t"
"lfs 13,0(9)\n\t"
#endif
"fabs 0,1\n\t"
"fsub 12,13,13\n\t"
"fcmpu 7,0,13\n\t"
"fcmpu 6,1,12\n\t"
"bnllr- 7\n\t"
"mtfsfi 7,1\n\t"
#ifdef __powerpc64__
"lfd 10,9b@toc(2)\n\t"
#else
"lfs 10,9b-8b(9)\n\t"
#endif
"ble- 6,2f\n\t"
"fadd 1,1,10\n\t"
"fadd 1,1,13\n\t"
"fsub 1,1,13\n\t"
"fabs 1,1\n\t"
"mtfsf 0x01,11\n\t"
"blr\n"
"2:" "fsub 9,1,10\n\t"
"bge- 6,3f\n\t"
"fsub 1,9,13\n\t"
"fadd 1,1,13\n\t"
"fnabs 1,1\n"
"3:" "mtfsf 0x01,11\n\t"
"blr\n\t"
"# frim == floor\n"
"frim:" "mffs 11\n\t"
#ifdef __powerpc64__
"lfd 13,8b@toc(2)\n\t"
#else
"mflr 11\n\t"
"bcl 20,31,1f\n"
"1:" "mflr 9\n\t"
"addis 9,9,8b-1b@ha\n\t"
"lfs 13,8b-1b@l(9)\n\t"
"mtlr 11\n\t"
#endif
"fabs 0,1\n\t"
"fsub 12,13,13\n\t"
"fcmpu 7,0,13\n\t"
"fcmpu 6,1,12\n\t"
"bnllr- 7\n\t"
"mtfsfi 7,3\n\t"
"ble- 6,2f\n\t"
"fadd 1,1,13\n\t"
"fsub 1,1,13\n\t"
"fabs 1,1\n\t"
"mtfsf 0x01,11\n\t"
"blr\n"
"2:" "bge- 6,3f\n\t"
"fsub 1,1,13\n\t"
"fadd 1,1,13\n\t"
"fnabs 1,1\n"
"3:" "mtfsf 0x01,11\n\t"
"blr\n");
#ifdef __powerpc64__
#define m1 0x5555555555555555L
#define m2 0x3333333333333333L
#define m3 0x0f0f0f0f0f0f0f0fL
#else
#define m1 0x55555555
#define m2 0x33333333
#define m3 0x0f0f0f0f
#endif
static inline unsigned long
popcntb (unsigned long n)
{
n -= (n >> 1) & m1;
n = (n & m2) + ((n >> 2) & m2);
n = (n + (n >> 4)) & m3;
return n;
}
static void
catch_sigill (int signal, struct sigcontext *ctx)
{
unsigned int insn = *(unsigned int *) (ctx->regs->nip);
#ifdef __powerpc64__
if ((insn & 0xfc1f07ff) == 0x7c0005be) /* mftgpr */
{
unsigned long *regs = (unsigned long *) ctx->regs;
unsigned fpr = (insn >> 11) & 0x1f;
unsigned gpr = (insn >> 21) & 0x1f;
regs[gpr] = regs[fpr + 0x30];
ctx->regs->nip += 4;
return;
}
if ((insn & 0xfc1f07ff) == 0x7c0004be) /*mffgpr */
{
unsigned long *regs = (unsigned long *) ctx->regs;
unsigned fpr = (insn >> 21) & 0x1f;
unsigned gpr = (insn >> 11) & 0x1f;
regs[fpr + 0x30] = regs[gpr];
ctx->regs->nip += 4;
return;
}
#endif
if ((insn & 0xfc1f073f) == 0xfc000310) /* fri[pznm] */
{
#ifdef __powerpc64__
double *regs = (double *) (((char *) ctx->regs) + 0x30 * 8);
unsigned int *fpscr = (unsigned int *) (((char *) ctx->regs) + 0x50 * 8 + 4);
#else
double *regs = (double *) (((char *) ctx->regs) + 0x30 * 4);
unsigned int *fpscr = (unsigned int *) (((char *) ctx->regs) + 0x30 * 4 + 0x20 * 8 + 4);
#endif
unsigned dest = (insn >> 21) & 0x1f;
unsigned src = (insn >> 11) & 0x1f;
switch (insn & 0xc0)
{
case 0:
regs[dest] = frin (regs[src]);
break;
case 0x40:
regs[dest] = friz (regs[src]);
break;
case 0x80:
regs[dest] = frip (regs[src]);
break;
case 0xc0:
regs[dest] = frim (regs[src]);
break;
}
/* Update raised exceptions. */
union { unsigned int i[2]; double d; } u;
asm volatile ("mffs %0" : "=f" (u.d));
u.i[1] &= 0xfffe0000; /* Is this correct? */
*fpscr |= u.i[1];
ctx->regs->nip += 4;
return;
}
if ((insn & 0xfc00ffff) == 0x7c0000f4) /* popcntb */
{
unsigned long *regs = (unsigned long *) ctx->regs;
unsigned dest = (insn >> 16) & 0x1f;
unsigned src = (insn >> 21) & 0x1f;
unsigned long res = 0;
int i;
regs[dest] = popcntb (regs[src]);
ctx->regs->nip += 4;
return;
}
struct sigaction sa;
sa.sa_handler = SIG_DFL;
sigemptyset (&sa.sa_mask);
sa.sa_flags = 0;
sigaction (signal, &sa, NULL);
raise (signal);
}
static void
__attribute__ ((constructor))
install_handler (void)
{
struct sigaction sa;
sa.sa_handler = (void *) catch_sigill;
sigemptyset (&sa.sa_mask);
sa.sa_flags = SA_RESTART;
sigaction (SIGILL, &sa, NULL);
}
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