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/*
* %CopyrightBegin%
*
* Copyright Ericsson AB 2003-2016. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* %CopyrightEnd%
*/
#include <stddef.h> /* offsetof() */
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "global.h"
#include <sys/mman.h>
#include "hipe_arch.h"
#include "hipe_native_bif.h" /* nbif_callemu() */
/* Flush dcache and invalidate icache for a range of addresses. */
void hipe_flush_icache_range(void *address, unsigned int nbytes)
{
char *a = (char*)address;
int n = nbytes;
while (n > 0) {
hipe_flush_icache_word(a);
a += 4;
n -= 4;
}
}
static void patch_sethi(Uint32 *address, unsigned int imm22)
{
unsigned int insn = *address;
*address = (insn & 0xFFC00000) | (imm22 & 0x003FFFFF);
hipe_flush_icache_word(address);
}
static void patch_ori(Uint32 *address, unsigned int imm10)
{
/* address points to an OR reg,imm,reg insn */
unsigned int insn = *address;
*address = (insn & 0xFFFFE000) | (imm10 & 0x3FF);
hipe_flush_icache_word(address);
}
static void patch_sethi_ori(Uint32 *address, Uint32 value)
{
patch_sethi(address, value >> 10);
patch_ori(address+1, value);
}
void hipe_patch_load_fe(Uint32 *address, Uint32 value)
{
patch_sethi_ori(address, value);
}
int hipe_patch_insn(void *address, Uint32 value, Eterm type)
{
switch (type) {
case am_load_mfa:
case am_atom:
case am_constant:
case am_closure:
case am_c_const:
break;
default:
return -1;
}
patch_sethi_ori((Uint32*)address, value);
return 0;
}
int hipe_patch_call(void *callAddress, void *destAddress, void *trampoline)
{
Uint32 relDest, newI;
if (trampoline)
return -1;
relDest = (Uint32)((Sint32)destAddress - (Sint32)callAddress);
newI = (1 << 30) | (relDest >> 2);
*(Uint32*)callAddress = newI;
hipe_flush_icache_word(callAddress);
return 0;
}
/*
* Memory allocator for executable code.
*
* This is required on x86 because some combinations
* of Linux kernels and CPU generations default to
* non-executable memory mappings, causing ordinary
* malloc() memory to be non-executable.
*/
static unsigned int code_bytes;
static char *code_next;
#if 0 /* change to non-zero to get allocation statistics at exit() */
static unsigned int total_mapped, nr_joins, nr_splits, total_alloc, nr_allocs, nr_large, total_lost;
static unsigned int atexit_done;
static void alloc_code_stats(void)
{
printf("\r\nalloc_code_stats: %u bytes mapped, %u joins, %u splits, %u bytes allocated, %u average alloc, %u large allocs, %u bytes lost\r\n",
total_mapped, nr_joins, nr_splits, total_alloc, nr_allocs ? total_alloc/nr_allocs : 0, nr_large, total_lost);
}
static void atexit_alloc_code_stats(void)
{
if (!atexit_done) {
atexit_done = 1;
(void)atexit(alloc_code_stats);
}
}
#define ALLOC_CODE_STATS(X) do{X;}while(0)
#else
#define ALLOC_CODE_STATS(X) do{}while(0)
#endif
static int morecore(unsigned int alloc_bytes)
{
unsigned int map_bytes;
char *map_hint, *map_start;
/* Page-align the amount to allocate. */
map_bytes = (alloc_bytes + 4095) & ~4095;
/* Round up small allocations. */
if (map_bytes < 1024*1024)
map_bytes = 1024*1024;
else
ALLOC_CODE_STATS(++nr_large);
/* Create a new memory mapping, ensuring it is executable
and in the low 2GB of the address space. Also attempt
to make it adjacent to the previous mapping. */
map_hint = code_next + code_bytes;
if ((unsigned long)map_hint & 4095)
abort();
map_start = mmap(map_hint, map_bytes,
PROT_EXEC|PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_ANONYMOUS
#ifdef __x86_64__
|MAP_32BIT
#endif
,
-1, 0);
if (map_start == MAP_FAILED)
return -1;
ALLOC_CODE_STATS(total_mapped += map_bytes);
/* Merge adjacent mappings, so the trailing portion of the previous
mapping isn't lost. In practice this is quite successful. */
if (map_start == map_hint) {
ALLOC_CODE_STATS(++nr_joins);
code_bytes += map_bytes;
} else {
ALLOC_CODE_STATS(++nr_splits);
ALLOC_CODE_STATS(total_lost += code_bytes);
code_next = map_start;
code_bytes = map_bytes;
}
ALLOC_CODE_STATS(atexit_alloc_code_stats());
return 0;
}
static void *alloc_code(unsigned int alloc_bytes)
{
void *res;
/* Align function entries. */
alloc_bytes = (alloc_bytes + 3) & ~3;
if (code_bytes < alloc_bytes && morecore(alloc_bytes) != 0)
return NULL;
ALLOC_CODE_STATS(++nr_allocs);
ALLOC_CODE_STATS(total_alloc += alloc_bytes);
res = code_next;
code_next += alloc_bytes;
code_bytes -= alloc_bytes;
return res;
}
void *hipe_alloc_code(Uint nrbytes, Eterm callees, Eterm *trampolines, Process *p)
{
if (is_not_nil(callees))
return NULL;
*trampolines = NIL;
return alloc_code(nrbytes);
}
void *hipe_make_native_stub(void *callee_exp, unsigned int beamArity)
{
unsigned int *code;
unsigned int callEmuOffset;
int i;
code = alloc_code(5*sizeof(int));
if (!code)
return NULL;
/* sethi %hi(Address), %i4 */
code[0] = 0x39000000 | (((unsigned int)callee_exp >> 10) & 0x3FFFFF);
/* or %g0, %o7, %i3 ! mov %o7, %i3 */
code[1] = 0xB610000F;
/* or %i4, %lo(Address), %i4 */
code[2] = 0xB8172000 | ((unsigned int)callee_exp & 0x3FF);
/* call callemu */
callEmuOffset = (char*)nbif_callemu - (char*)&code[3];
code[3] = (1 << 30) | ((callEmuOffset >> 2) & 0x3FFFFFFF);
/* or %g0, Arity, %i5 ! mov Arity, %i5 */
code[4] = 0xBA102000 | (beamArity & 0x0FFF);
/* flush I-cache as if by write_u32() */
for (i = 0; i < 5; ++i)
hipe_flush_icache_word(&code[i]);
return code;
}
void hipe_arch_print_pcb(struct hipe_process_state *p)
{
#define U(n,x) \
printf(" % 4d | %s | 0x%0*lx | %*s |\r\n", (int)offsetof(struct hipe_process_state,x), n, 2*(int)sizeof(long), (unsigned long)p->x, 2+2*(int)sizeof(long), "")
U("nra ", nra);
U("narity ", narity);
#undef U
}
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