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/******************************** -*- C -*- ****************************
*
* Run-time assembler for the arm
*
***********************************************************************/
/***********************************************************************
*
* Copyright 2011 Free Software Foundation
*
* This file is part of GNU lightning.
*
* GNU lightning 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 3, or (at your option)
* any later version.
*
* GNU lightning 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 GNU lightning; see the file COPYING.LESSER; if not, write to the
* Free Software Foundation, 51 Franklin Street, Fifth Floor, Boston,
* MA 02110-1301, USA.
*
* Authors:
* Paulo Cesar Pereira de Andrade
***********************************************************************/
#ifndef __lightning_funcs_h
#define __lightning_funcs_h
#if defined(__linux__)
# include <stdio.h>
# include <string.h>
#endif
#include <stdlib.h>
#include <unistd.h>
#include <sys/mman.h>
#if defined(ios_HOST_OS) || defined (darwin_HOST_OS)
extern void sys_icache_invalidate(void *start, size_t len);
static void
jit_flush_code(void *start, void *end)
{
mprotect(start, (char *)end - (char *)start,
PROT_READ | PROT_WRITE | PROT_EXEC);
sys_icache_invalidate(start, (char *)end-(char *)start);
}
#else
extern void __clear_cache(void*, void*);
static void
jit_flush_code(void *start, void *end)
{
mprotect(start, (char *)end - (char *)start,
PROT_READ | PROT_WRITE | PROT_EXEC);
__clear_cache(start, end);
}
#endif
__attribute__((constructor)) static void
jit_get_cpu(void)
{
#if defined(__linux__)
FILE *fp;
char *ptr;
char buf[128];
static int initialized;
if (initialized)
return;
initialized = 1;
if ((fp = fopen("/proc/cpuinfo", "r")) == NULL)
return;
while (fgets(buf, sizeof(buf), fp)) {
if (strncmp(buf, "CPU architecture:", 17) == 0) {
jit_cpu.version = strtol(buf + 17, &ptr, 10);
while (*ptr) {
if (*ptr == 'T' || *ptr == 't') {
++ptr;
jit_cpu.thumb = 1;
}
else if (*ptr == 'E' || *ptr == 'e') {
jit_cpu.extend = 1;
++ptr;
}
else
++ptr;
}
}
else if (strncmp(buf, "Features\t:", 10) == 0) {
if ((ptr = strstr(buf + 10, "vfpv")))
jit_cpu.vfp = strtol(ptr + 4, NULL, 0);
if ((ptr = strstr(buf + 10, "neon")))
jit_cpu.neon = 1;
if ((ptr = strstr(buf + 10, "thumb")))
jit_cpu.thumb = 1;
}
}
fclose(fp);
#endif
#if defined(__ARM_PCS_VFP)
if (!jit_cpu.vfp)
jit_cpu.vfp = 3;
if (!jit_cpu.version)
jit_cpu.version = 7;
jit_cpu.abi = 1;
#endif
/* armv6t2 todo (software float and thumb2) */
if (!jit_cpu.vfp && jit_cpu.thumb)
jit_cpu.thumb = 0;
}
extern int __aeabi_idivmod(int, int);
extern unsigned __aeabi_uidivmod(unsigned, unsigned);
#pragma push_macro("_jit")
#ifdef _jit
#undef _jit
#endif
#define _jit (*jit)
static void
arm_divmod(jit_state* jit, int div, int sign,
jit_gpr_t r0, jit_gpr_t r1, jit_gpr_t r2)
{
int d;
int l;
void *p;
l = 0xf;
if ((int)r0 < 4)
/* bogus extra push to align at 8 bytes */
l = (l & ~(1 << r0)) | 0x10;
#ifdef USE_THUMB_CODE
T1_PUSH(l);
#else
_PUSH(l);
#endif
if (r1 == _R1 && r2 == _R0) {
jit_movr_i(JIT_FTMP, _R0);
jit_movr_i(_R0, _R1);
jit_movr_i(_R1, JIT_FTMP);
} else if (r2 == _R0) {
jit_movr_i(_R1, r2);
jit_movr_i(_R0, r1);
} else {
jit_movr_i(_R0, r1);
jit_movr_i(_R1, r2);
}
p = (sign) ? (void*) __aeabi_idivmod : (void*) __aeabi_uidivmod;
if (!jit_exchange_p()) {
#ifdef USE_THUMB_CODE
d = (((int)p - (int)_jit.x.pc) >> 1) - 2;
#else
d = (((int)p - (int)_jit.x.pc) >> 2) - 2;
#endif
if (_s24P(d)) {
#ifdef USE_THUMB_CODE
T2_BLI(encode_thumb_jump(d));
#else
_BLI(d & 0x00ffffff);
#endif
}
else
goto fallback;
} else {
fallback:
jit_movi_i(JIT_FTMP, (int)p);
#ifdef USE_THUMB_CODE
T1_BLX(JIT_FTMP);
#else
_BLX(JIT_FTMP);
#endif
}
if (div) {
jit_movr_i(r0, _R0);
} else {
jit_movr_i(r0, _R1);
}
#ifdef USE_THUMB_CODE
T1_POP(l);
#else
_POP(l);
#endif
}
#pragma pop_macro("_jit")
#endif /* __lightning_funcs_h */
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