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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 "hipe_arch.h"
#include "hipe_native_bif.h" /* nbif_callemu() */
#undef F_TIMO
#undef THE_NON_VALUE
#undef ERL_FUN_SIZE
#include "hipe_literals.h"
void hipe_patch_load_fe(Uint32 *address, Uint32 value)
{
/* address points to a disp32 or imm32 operand */
*address += value;
}
int hipe_patch_insn(void *address, Uint32 value, Eterm type)
{
switch (type) {
case am_closure:
case am_constant:
case am_atom:
case am_c_const:
break;
case am_x86_abs_pcrel:
value += (Uint)address;
break;
default:
return -1;
}
*(Uint32*)address += value;
return 0;
}
int hipe_patch_call(void *callAddress, void *destAddress, void *trampoline)
{
Uint rel32;
if (trampoline)
return -1;
rel32 = (Uint)destAddress - (Uint)callAddress - 4;
*(Uint32*)callAddress = rel32;
hipe_flush_icache_word(callAddress);
return 0;
}
static void *alloc_code(unsigned int alloc_bytes)
{
return erts_alloc(ERTS_ALC_T_HIPE_EXEC, alloc_bytes);
}
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_free_code(void* code, unsigned int bytes)
{
erts_free(ERTS_ALC_T_HIPE_EXEC, code);
}
void *hipe_make_native_stub(void *callee_exp, unsigned int beamArity)
{
/*
* This creates a native code stub with the following contents:
*
* movl $Address, P_CALLEE_EXP(%ebp)
* movb $Arity, P_ARITY(%ebp)
* jmp callemu
*
* The stub has variable size, depending on whether the P_CALLEE_EXP
* and P_ARITY offsets fit in 8-bit signed displacements or not.
* The rel32 offset in the final jmp depends on its actual location,
* which also depends on the size of the previous instructions.
* Arity is stored with a movb because (a) Bj�rn tells me arities
* are <= 255, and (b) a movb is smaller and faster than a movl.
*/
unsigned int codeSize;
unsigned char *code, *codep;
unsigned int callEmuOffset;
codeSize = /* 16, 19, or 22 bytes */
16 + /* 16 when both offsets are 8-bit */
(P_CALLEE_EXP >= 128 ? 3 : 0) +
(P_ARITY >= 128 ? 3 : 0);
codep = code = alloc_code(codeSize);
if (!code)
return NULL;
/* movl $beamAddress, P_CALLEE_EXP(%ebp); 3 or 6 bytes, plus 4 */
codep[0] = 0xc7;
#if P_CALLEE_EXP >= 128
codep[1] = 0x85; /* disp32[EBP] */
codep[2] = P_CALLEE_EXP & 0xFF;
codep[3] = (P_CALLEE_EXP >> 8) & 0xFF;
codep[4] = (P_CALLEE_EXP >> 16) & 0xFF;
codep[5] = (P_CALLEE_EXP >> 24) & 0xFF;
codep += 6;
#else
codep[1] = 0x45; /* disp8[EBP] */
codep[2] = P_CALLEE_EXP;
codep += 3;
#endif
codep[0] = ((unsigned int)callee_exp) & 0xFF;
codep[1] = ((unsigned int)callee_exp >> 8) & 0xFF;
codep[2] = ((unsigned int)callee_exp >> 16) & 0xFF;
codep[3] = ((unsigned int)callee_exp >> 24) & 0xFF;
codep += 4;
/* movb $beamArity, P_ARITY(%ebp); 3 or 6 bytes */
codep[0] = 0xc6;
#if P_ARITY >= 128
codep[1] = 0x85; /* disp32[EBP] */
codep[2] = P_ARITY & 0xFF;
codep[3] = (P_ARITY >> 8) & 0xFF;
codep[4] = (P_ARITY >> 16) & 0xFF;
codep[5] = (P_ARITY >> 24) & 0xFF;
codep += 6;
#else
codep[1] = 0x45; /* disp8[EBP] */
codep[2] = P_ARITY;
codep += 3;
#endif
codep[0] = beamArity;
codep += 1;
/* jmp callemu; 5 bytes */
callEmuOffset = (unsigned char*)nbif_callemu - (code + codeSize);
codep[0] = 0xe9;
codep[1] = callEmuOffset & 0xFF;
codep[2] = (callEmuOffset >> 8) & 0xFF;
codep[3] = (callEmuOffset >> 16) & 0xFF;
codep[4] = (callEmuOffset >> 24) & 0xFF;
codep += 5;
ASSERT(codep == code + codeSize);
/* I-cache flush? */
return code;
}
void hipe_free_native_stub(void* stub)
{
erts_free(ERTS_ALC_T_HIPE_EXEC, stub);
}
void hipe_arch_print_pcb(struct hipe_process_state *p)
{
#define U(n,x) \
printf(" % 4d | %s | 0x%08x | |\r\n", (int)offsetof(struct hipe_process_state,x), n, (unsigned)p->x)
U("ncsp ", ncsp);
U("narity ", narity);
#undef U
}
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