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sljitNativeARM_32.c
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/*
* Stack-less Just-In-Time compiler
*
* Copyright Zoltan Herczeg ([email protected]). All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification, are
* permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this list of
* conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice, this list
* of conditions and the following disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) AND CONTRIBUTORS ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
* SHALL THE COPYRIGHT HOLDER(S) OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifdef __SOFTFP__
#define ARM_ABI_INFO " ABI:softfp"
#else
#define ARM_ABI_INFO " ABI:hardfp"
#endif
SLJIT_API_FUNC_ATTRIBUTE const char* sljit_get_platform_name(void)
{
#if (defined SLJIT_CONFIG_ARM_V7 && SLJIT_CONFIG_ARM_V7)
return "ARMv7" SLJIT_CPUINFO ARM_ABI_INFO;
#elif (defined SLJIT_CONFIG_ARM_V6 && SLJIT_CONFIG_ARM_V6)
return "ARMv6" SLJIT_CPUINFO ARM_ABI_INFO;
#else
#error "Internal error: Unknown ARM architecture"
#endif
}
/* Length of an instruction word. */
typedef sljit_u32 sljit_ins;
/* Last register + 1. */
#define TMP_REG1 (SLJIT_NUMBER_OF_REGISTERS + 2)
#define TMP_REG2 (SLJIT_NUMBER_OF_REGISTERS + 3)
#define TMP_PC (SLJIT_NUMBER_OF_REGISTERS + 4)
#define TMP_FREG1 (SLJIT_NUMBER_OF_FLOAT_REGISTERS + 1)
#define TMP_FREG2 (SLJIT_NUMBER_OF_FLOAT_REGISTERS + 2)
/* In ARM instruction words.
Cache lines are usually 32 byte aligned. */
#define CONST_POOL_ALIGNMENT 8
#define CONST_POOL_EMPTY 0xffffffff
#define ALIGN_INSTRUCTION(ptr) \
(sljit_ins*)(((sljit_ins)(ptr) + (CONST_POOL_ALIGNMENT * sizeof(sljit_ins)) - 1) & ~((CONST_POOL_ALIGNMENT * sizeof(sljit_ins)) - 1))
#define MAX_DIFFERENCE(max_diff) \
(((max_diff) / (sljit_s32)sizeof(sljit_ins)) - (CONST_POOL_ALIGNMENT - 1))
/* See sljit_emit_enter and sljit_emit_op0 if you want to change them. */
static const sljit_u8 reg_map[SLJIT_NUMBER_OF_REGISTERS + 5] = {
0, 0, 1, 2, 3, 11, 10, 9, 8, 7, 6, 5, 4, 13, 12, 14, 15
};
static const sljit_u8 freg_map[((SLJIT_NUMBER_OF_FLOAT_REGISTERS + 2) << 1) + 1] = {
0,
0, 1, 2, 3, 4, 5, 15, 14, 13, 12, 11, 10, 9, 8,
7, 6,
0, 1, 2, 3, 4, 5, 15, 14, 13, 12, 11, 10, 9, 8,
7, 6
};
static const sljit_u8 freg_ebit_map[((SLJIT_NUMBER_OF_FLOAT_REGISTERS + 2) << 1) + 1] = {
0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1
};
#define RM(rm) ((sljit_ins)reg_map[rm])
#define RM8(rm) ((sljit_ins)reg_map[rm] << 8)
#define RD(rd) ((sljit_ins)reg_map[rd] << 12)
#define RN(rn) ((sljit_ins)reg_map[rn] << 16)
#define VM(vm) (((sljit_ins)freg_map[vm]) | ((sljit_ins)freg_ebit_map[vm] << 5))
#define VD(vd) (((sljit_ins)freg_map[vd] << 12) | ((sljit_ins)freg_ebit_map[vd] << 22))
#define VN(vn) (((sljit_ins)freg_map[vn] << 16) | ((sljit_ins)freg_ebit_map[vn] << 7))
/* --------------------------------------------------------------------- */
/* Instrucion forms */
/* --------------------------------------------------------------------- */
/* The instruction includes the AL condition.
INST_NAME - CONDITIONAL remove this flag. */
#define COND_MASK 0xf0000000
#define CONDITIONAL 0xe0000000
#define PUSH_POOL 0xff000000
#define ADC 0xe0a00000
#define ADD 0xe0800000
#define AND 0xe0000000
#define B 0xea000000
#define BIC 0xe1c00000
#define BKPT 0xe1200070
#define BL 0xeb000000
#define BLX 0xe12fff30
#define BX 0xe12fff10
#define CLZ 0xe16f0f10
#define CMN 0xe1600000
#define CMP 0xe1400000
#define EOR 0xe0200000
#define LDR 0xe5100000
#define LDR_POST 0xe4100000
#define LDREX 0xe1900f9f
#define LDREXB 0xe1d00f9f
#define LDREXH 0xe1f00f9f
#define MOV 0xe1a00000
#define MUL 0xe0000090
#define MVN 0xe1e00000
#define NOP 0xe1a00000
#define ORR 0xe1800000
#define PUSH 0xe92d0000
#define POP 0xe8bd0000
#define REV 0xe6bf0f30
#define REV16 0xe6bf0fb0
#define RSB 0xe0600000
#define RSC 0xe0e00000
#define SBC 0xe0c00000
#define SMULL 0xe0c00090
#define STR 0xe5000000
#define STREX 0xe1800f90
#define STREXB 0xe1c00f90
#define STREXH 0xe1e00f90
#define SUB 0xe0400000
#define SXTB 0xe6af0070
#define SXTH 0xe6bf0070
#define TST 0xe1000000
#define UMULL 0xe0800090
#define UXTB 0xe6ef0070
#define UXTH 0xe6ff0070
#define VABS_F32 0xeeb00ac0
#define VADD_F32 0xee300a00
#define VAND 0xf2000110
#define VCMP_F32 0xeeb40a40
#define VCVT_F32_S32 0xeeb80ac0
#define VCVT_F32_U32 0xeeb80a40
#define VCVT_F64_F32 0xeeb70ac0
#define VCVT_S32_F32 0xeebd0ac0
#define VDIV_F32 0xee800a00
#define VDUP 0xee800b10
#define VDUP_s 0xf3b00c00
#define VEOR 0xf3000110
#define VLD1 0xf4200000
#define VLD1_r 0xf4a00c00
#define VLD1_s 0xf4a00000
#define VLDR_F32 0xed100a00
#define VMOV_F32 0xeeb00a40
#define VMOV 0xee000a10
#define VMOV2 0xec400a10
#define VMOV_i 0xf2800010
#define VMOV_s 0xee000b10
#define VMOVN 0xf3b20200
#define VMRS 0xeef1fa10
#define VMUL_F32 0xee200a00
#define VNEG_F32 0xeeb10a40
#define VORR 0xf2200110
#define VPOP 0xecbd0b00
#define VPUSH 0xed2d0b00
#define VSHLL 0xf2800a10
#define VSHR 0xf2800010
#define VSRA 0xf2800110
#define VST1 0xf4000000
#define VST1_s 0xf4800000
#define VSTR_F32 0xed000a00
#define VSUB_F32 0xee300a40
#if (defined SLJIT_CONFIG_ARM_V7 && SLJIT_CONFIG_ARM_V7)
/* Arm v7 specific instructions. */
#define MOVT 0xe3400000
#define MOVW 0xe3000000
#define RBIT 0xe6ff0f30
#endif
#if (defined SLJIT_ARGUMENT_CHECKS && SLJIT_ARGUMENT_CHECKS)
static sljit_s32 function_check_is_freg(struct sljit_compiler *compiler, sljit_s32 fr, sljit_s32 is_32)
{
if (compiler->scratches == -1)
return 0;
if (is_32 && fr >= SLJIT_F64_SECOND(SLJIT_FR0))
fr -= SLJIT_F64_SECOND(0);
return (fr >= SLJIT_FR0 && fr < (SLJIT_FR0 + compiler->fscratches))
|| (fr > (SLJIT_FS0 - compiler->fsaveds) && fr <= SLJIT_FS0)
|| (fr >= SLJIT_TMP_FREGISTER_BASE && fr < (SLJIT_TMP_FREGISTER_BASE + SLJIT_NUMBER_OF_TEMPORARY_FLOAT_REGISTERS));
}
#endif /* SLJIT_ARGUMENT_CHECKS */
#if (defined SLJIT_CONFIG_ARM_V6 && SLJIT_CONFIG_ARM_V6)
static sljit_s32 push_cpool(struct sljit_compiler *compiler)
{
/* Pushing the constant pool into the instruction stream. */
sljit_ins* inst;
sljit_uw* cpool_ptr;
sljit_uw* cpool_end;
sljit_s32 i;
/* The label could point the address after the constant pool. */
if (compiler->last_label && compiler->last_label->size == compiler->size)
compiler->last_label->size += compiler->cpool_fill + (CONST_POOL_ALIGNMENT - 1) + 1;
SLJIT_ASSERT(compiler->cpool_fill > 0 && compiler->cpool_fill <= CPOOL_SIZE);
inst = (sljit_ins*)ensure_buf(compiler, sizeof(sljit_ins));
FAIL_IF(!inst);
compiler->size++;
*inst = 0xff000000 | compiler->cpool_fill;
for (i = 0; i < CONST_POOL_ALIGNMENT - 1; i++) {
inst = (sljit_ins*)ensure_buf(compiler, sizeof(sljit_ins));
FAIL_IF(!inst);
compiler->size++;
*inst = 0;
}
cpool_ptr = compiler->cpool;
cpool_end = cpool_ptr + compiler->cpool_fill;
while (cpool_ptr < cpool_end) {
inst = (sljit_ins*)ensure_buf(compiler, sizeof(sljit_ins));
FAIL_IF(!inst);
compiler->size++;
*inst = *cpool_ptr++;
}
compiler->cpool_diff = CONST_POOL_EMPTY;
compiler->cpool_fill = 0;
return SLJIT_SUCCESS;
}
static sljit_s32 push_inst(struct sljit_compiler *compiler, sljit_ins inst)
{
sljit_ins* ptr;
if (SLJIT_UNLIKELY(compiler->cpool_diff != CONST_POOL_EMPTY && compiler->size - compiler->cpool_diff >= MAX_DIFFERENCE(4092)))
FAIL_IF(push_cpool(compiler));
ptr = (sljit_ins*)ensure_buf(compiler, sizeof(sljit_ins));
FAIL_IF(!ptr);
compiler->size++;
*ptr = inst;
return SLJIT_SUCCESS;
}
static sljit_s32 push_inst_with_literal(struct sljit_compiler *compiler, sljit_ins inst, sljit_uw literal)
{
sljit_ins* ptr;
sljit_uw cpool_index = CPOOL_SIZE;
sljit_uw* cpool_ptr;
sljit_uw* cpool_end;
sljit_u8* cpool_unique_ptr;
if (SLJIT_UNLIKELY(compiler->cpool_diff != CONST_POOL_EMPTY && compiler->size - compiler->cpool_diff >= MAX_DIFFERENCE(4092)))
FAIL_IF(push_cpool(compiler));
else if (compiler->cpool_fill > 0) {
cpool_ptr = compiler->cpool;
cpool_end = cpool_ptr + compiler->cpool_fill;
cpool_unique_ptr = compiler->cpool_unique;
do {
if ((*cpool_ptr == literal) && !(*cpool_unique_ptr)) {
cpool_index = (sljit_uw)(cpool_ptr - compiler->cpool);
break;
}
cpool_ptr++;
cpool_unique_ptr++;
} while (cpool_ptr < cpool_end);
}
if (cpool_index == CPOOL_SIZE) {
/* Must allocate a new entry in the literal pool. */
if (compiler->cpool_fill < CPOOL_SIZE) {
cpool_index = compiler->cpool_fill;
compiler->cpool_fill++;
}
else {
FAIL_IF(push_cpool(compiler));
cpool_index = 0;
compiler->cpool_fill = 1;
}
}
SLJIT_ASSERT((inst & 0xfff) == 0);
ptr = (sljit_ins*)ensure_buf(compiler, sizeof(sljit_ins));
FAIL_IF(!ptr);
compiler->size++;
*ptr = inst | cpool_index;
compiler->cpool[cpool_index] = literal;
compiler->cpool_unique[cpool_index] = 0;
if (compiler->cpool_diff == CONST_POOL_EMPTY)
compiler->cpool_diff = compiler->size;
return SLJIT_SUCCESS;
}
static sljit_s32 push_inst_with_unique_literal(struct sljit_compiler *compiler, sljit_ins inst, sljit_uw literal)
{
sljit_ins* ptr;
if (SLJIT_UNLIKELY((compiler->cpool_diff != CONST_POOL_EMPTY && compiler->size - compiler->cpool_diff >= MAX_DIFFERENCE(4092)) || compiler->cpool_fill >= CPOOL_SIZE))
FAIL_IF(push_cpool(compiler));
SLJIT_ASSERT(compiler->cpool_fill < CPOOL_SIZE && (inst & 0xfff) == 0);
ptr = (sljit_ins*)ensure_buf(compiler, sizeof(sljit_ins));
FAIL_IF(!ptr);
compiler->size++;
*ptr = inst | compiler->cpool_fill;
compiler->cpool[compiler->cpool_fill] = literal;
compiler->cpool_unique[compiler->cpool_fill] = 1;
compiler->cpool_fill++;
if (compiler->cpool_diff == CONST_POOL_EMPTY)
compiler->cpool_diff = compiler->size;
return SLJIT_SUCCESS;
}
static SLJIT_INLINE sljit_s32 prepare_blx(struct sljit_compiler *compiler)
{
/* Place for at least two instruction (doesn't matter whether the first has a literal). */
if (SLJIT_UNLIKELY(compiler->cpool_diff != CONST_POOL_EMPTY && compiler->size - compiler->cpool_diff >= MAX_DIFFERENCE(4088)))
return push_cpool(compiler);
return SLJIT_SUCCESS;
}
static SLJIT_INLINE sljit_s32 emit_blx(struct sljit_compiler *compiler)
{
/* Must follow tightly the previous instruction (to be able to convert it to bl instruction). */
SLJIT_ASSERT(compiler->cpool_diff == CONST_POOL_EMPTY || compiler->size - compiler->cpool_diff < MAX_DIFFERENCE(4092));
SLJIT_ASSERT(reg_map[TMP_REG1] != 14);
return push_inst(compiler, BLX | RM(TMP_REG1));
}
static sljit_uw patch_pc_relative_loads(sljit_uw *last_pc_patch, sljit_uw *code_ptr, sljit_uw* const_pool, sljit_uw cpool_size)
{
sljit_uw diff;
sljit_uw ind;
sljit_uw counter = 0;
sljit_uw* clear_const_pool = const_pool;
sljit_uw* clear_const_pool_end = const_pool + cpool_size;
SLJIT_ASSERT(const_pool - code_ptr <= CONST_POOL_ALIGNMENT);
/* Set unused flag for all literals in the constant pool.
I.e.: unused literals can belong to branches, which can be encoded as B or BL.
We can "compress" the constant pool by discarding these literals. */
while (clear_const_pool < clear_const_pool_end)
*clear_const_pool++ = (sljit_uw)(-1);
while (last_pc_patch < code_ptr) {
/* Data transfer instruction with Rn == r15. */
if ((*last_pc_patch & 0x0e0f0000) == 0x040f0000) {
diff = (sljit_uw)(const_pool - last_pc_patch);
ind = (*last_pc_patch) & 0xfff;
/* Must be a load instruction with immediate offset. */
SLJIT_ASSERT(ind < cpool_size && !(*last_pc_patch & (1 << 25)) && (*last_pc_patch & (1 << 20)));
if ((sljit_s32)const_pool[ind] < 0) {
const_pool[ind] = counter;
ind = counter;
counter++;
}
else
ind = const_pool[ind];
SLJIT_ASSERT(diff >= 1);
if (diff >= 2 || ind > 0) {
diff = (diff + (sljit_uw)ind - 2) << 2;
SLJIT_ASSERT(diff <= 0xfff);
*last_pc_patch = (*last_pc_patch & ~(sljit_uw)0xfff) | diff;
}
else
*last_pc_patch = (*last_pc_patch & ~(sljit_uw)(0xfff | (1 << 23))) | 0x004;
}
last_pc_patch++;
}
return counter;
}
/* In some rare ocasions we may need future patches. The probability is close to 0 in practice. */
struct future_patch {
struct future_patch* next;
sljit_s32 index;
sljit_s32 value;
};
static sljit_s32 resolve_const_pool_index(struct sljit_compiler *compiler, struct future_patch **first_patch, sljit_uw cpool_current_index, sljit_uw *cpool_start_address, sljit_uw *buf_ptr)
{
sljit_u32 value;
struct future_patch *curr_patch, *prev_patch;
SLJIT_UNUSED_ARG(compiler);
/* Using the values generated by patch_pc_relative_loads. */
if (!*first_patch)
value = cpool_start_address[cpool_current_index];
else {
curr_patch = *first_patch;
prev_patch = NULL;
while (1) {
if (!curr_patch) {
value = cpool_start_address[cpool_current_index];
break;
}
if ((sljit_uw)curr_patch->index == cpool_current_index) {
value = (sljit_uw)curr_patch->value;
if (prev_patch)
prev_patch->next = curr_patch->next;
else
*first_patch = curr_patch->next;
SLJIT_FREE(curr_patch, compiler->allocator_data);
break;
}
prev_patch = curr_patch;
curr_patch = curr_patch->next;
}
}
if ((sljit_sw)value >= 0) {
if (value > cpool_current_index) {
curr_patch = (struct future_patch*)SLJIT_MALLOC(sizeof(struct future_patch), compiler->allocator_data);
if (!curr_patch) {
while (*first_patch) {
curr_patch = *first_patch;
*first_patch = (*first_patch)->next;
SLJIT_FREE(curr_patch, compiler->allocator_data);
}
return SLJIT_ERR_ALLOC_FAILED;
}
curr_patch->next = *first_patch;
curr_patch->index = (sljit_sw)value;
curr_patch->value = (sljit_sw)cpool_start_address[value];
*first_patch = curr_patch;
}
cpool_start_address[value] = *buf_ptr;
}
return SLJIT_SUCCESS;
}
#else
static sljit_s32 push_inst(struct sljit_compiler *compiler, sljit_ins inst)
{
sljit_ins* ptr;
ptr = (sljit_ins*)ensure_buf(compiler, sizeof(sljit_ins));
FAIL_IF(!ptr);
compiler->size++;
*ptr = inst;
return SLJIT_SUCCESS;
}
static SLJIT_INLINE sljit_s32 emit_imm(struct sljit_compiler *compiler, sljit_s32 reg, sljit_sw imm)
{
FAIL_IF(push_inst(compiler, MOVW | RD(reg) | ((imm << 4) & 0xf0000) | ((sljit_u32)imm & 0xfff)));
return push_inst(compiler, MOVT | RD(reg) | ((imm >> 12) & 0xf0000) | (((sljit_u32)imm >> 16) & 0xfff));
}
#endif
static SLJIT_INLINE sljit_s32 detect_jump_type(struct sljit_jump *jump, sljit_uw *code_ptr, sljit_uw *code, sljit_sw executable_offset)
{
sljit_sw diff;
if (jump->flags & SLJIT_REWRITABLE_JUMP)
return 0;
#if (defined SLJIT_CONFIG_ARM_V6 && SLJIT_CONFIG_ARM_V6)
if (jump->flags & IS_BL)
code_ptr--;
if (jump->flags & JUMP_ADDR)
diff = ((sljit_sw)jump->u.target - (sljit_sw)(code_ptr + 2) - executable_offset);
else {
SLJIT_ASSERT(jump->flags & JUMP_LABEL);
diff = ((sljit_sw)(code + jump->u.label->size) - (sljit_sw)(code_ptr + 2));
}
/* Branch to Thumb code has not been optimized yet. */
if (diff & 0x3)
return 0;
if (jump->flags & IS_BL) {
if (diff <= 0x01ffffff && diff >= -0x02000000) {
*code_ptr = (BL - CONDITIONAL) | (*(code_ptr + 1) & COND_MASK);
jump->flags |= PATCH_B;
return 1;
}
}
else {
if (diff <= 0x01ffffff && diff >= -0x02000000) {
*code_ptr = (B - CONDITIONAL) | (*code_ptr & COND_MASK);
jump->flags |= PATCH_B;
}
}
#else /* !SLJIT_CONFIG_ARM_V6 */
if (jump->flags & JUMP_ADDR)
diff = ((sljit_sw)jump->u.target - (sljit_sw)code_ptr - executable_offset);
else {
SLJIT_ASSERT(jump->flags & JUMP_LABEL);
diff = ((sljit_sw)(code + jump->u.label->size) - (sljit_sw)code_ptr);
}
/* Branch to Thumb code has not been optimized yet. */
if (diff & 0x3)
return 0;
if (diff <= 0x01ffffff && diff >= -0x02000000) {
code_ptr -= 2;
*code_ptr = ((jump->flags & IS_BL) ? (BL - CONDITIONAL) : (B - CONDITIONAL)) | (code_ptr[2] & COND_MASK);
jump->flags |= PATCH_B;
return 1;
}
#endif /* SLJIT_CONFIG_ARM_V6 */
return 0;
}
static SLJIT_INLINE void inline_set_jump_addr(sljit_uw jump_ptr, sljit_sw executable_offset, sljit_uw new_addr, sljit_s32 flush_cache)
{
#if (defined SLJIT_CONFIG_ARM_V6 && SLJIT_CONFIG_ARM_V6)
sljit_ins *ptr = (sljit_ins*)jump_ptr;
sljit_ins *inst = (sljit_ins*)ptr[0];
sljit_ins mov_pc = ptr[1];
sljit_s32 bl = (mov_pc & 0x0000f000) != RD(TMP_PC);
sljit_sw diff = (sljit_sw)(((sljit_sw)new_addr - (sljit_sw)(inst + 2) - executable_offset) >> 2);
SLJIT_UNUSED_ARG(executable_offset);
if (diff <= 0x7fffff && diff >= -0x800000) {
/* Turn to branch. */
if (!bl) {
if (flush_cache) {
SLJIT_UPDATE_WX_FLAGS(inst, inst + 1, 0);
}
inst[0] = (mov_pc & COND_MASK) | (B - CONDITIONAL) | (diff & 0xffffff);
if (flush_cache) {
SLJIT_UPDATE_WX_FLAGS(inst, inst + 1, 1);
inst = (sljit_ins*)SLJIT_ADD_EXEC_OFFSET(inst, executable_offset);
SLJIT_CACHE_FLUSH(inst, inst + 1);
}
} else {
if (flush_cache) {
SLJIT_UPDATE_WX_FLAGS(inst, inst + 2, 0);
}
inst[0] = (mov_pc & COND_MASK) | (BL - CONDITIONAL) | (diff & 0xffffff);
inst[1] = NOP;
if (flush_cache) {
SLJIT_UPDATE_WX_FLAGS(inst, inst + 2, 1);
inst = (sljit_ins*)SLJIT_ADD_EXEC_OFFSET(inst, executable_offset);
SLJIT_CACHE_FLUSH(inst, inst + 2);
}
}
} else {
/* Get the position of the constant. */
if (mov_pc & (1 << 23))
ptr = inst + ((mov_pc & 0xfff) >> 2) + 2;
else
ptr = inst + 1;
if (*inst != mov_pc) {
if (flush_cache) {
SLJIT_UPDATE_WX_FLAGS(inst, inst + (!bl ? 1 : 2), 0);
}
inst[0] = mov_pc;
if (!bl) {
if (flush_cache) {
SLJIT_UPDATE_WX_FLAGS(inst, inst + 1, 1);
inst = (sljit_ins*)SLJIT_ADD_EXEC_OFFSET(inst, executable_offset);
SLJIT_CACHE_FLUSH(inst, inst + 1);
}
} else {
inst[1] = BLX | RM(TMP_REG1);
if (flush_cache) {
SLJIT_UPDATE_WX_FLAGS(inst, inst + 2, 1);
inst = (sljit_ins*)SLJIT_ADD_EXEC_OFFSET(inst, executable_offset);
SLJIT_CACHE_FLUSH(inst, inst + 2);
}
}
}
if (flush_cache) {
SLJIT_UPDATE_WX_FLAGS(ptr, ptr + 1, 0);
}
*ptr = new_addr;
if (flush_cache) {
SLJIT_UPDATE_WX_FLAGS(ptr, ptr + 1, 1);
}
}
#else /* !SLJIT_CONFIG_ARM_V6 */
sljit_ins *inst = (sljit_ins*)jump_ptr;
SLJIT_UNUSED_ARG(executable_offset);
SLJIT_ASSERT((inst[0] & 0xfff00000) == MOVW && (inst[1] & 0xfff00000) == MOVT);
if (flush_cache) {
SLJIT_UPDATE_WX_FLAGS(inst, inst + 2, 0);
}
inst[0] = MOVW | (inst[0] & 0xf000) | ((new_addr << 4) & 0xf0000) | (new_addr & 0xfff);
inst[1] = MOVT | (inst[1] & 0xf000) | ((new_addr >> 12) & 0xf0000) | ((new_addr >> 16) & 0xfff);
if (flush_cache) {
SLJIT_UPDATE_WX_FLAGS(inst, inst + 2, 1);
inst = (sljit_ins*)SLJIT_ADD_EXEC_OFFSET(inst, executable_offset);
SLJIT_CACHE_FLUSH(inst, inst + 2);
}
#endif /* SLJIT_CONFIG_ARM_V6 */
}
static sljit_uw get_imm(sljit_uw imm);
static sljit_s32 load_immediate(struct sljit_compiler *compiler, sljit_s32 reg, sljit_uw imm);
static sljit_s32 emit_op_mem(struct sljit_compiler *compiler, sljit_s32 flags, sljit_s32 reg, sljit_s32 arg, sljit_sw argw, sljit_s32 tmp_reg);
static SLJIT_INLINE void inline_set_const(sljit_uw addr, sljit_sw executable_offset, sljit_uw new_constant, sljit_s32 flush_cache)
{
#if (defined SLJIT_CONFIG_ARM_V6 && SLJIT_CONFIG_ARM_V6)
sljit_ins *ptr = (sljit_ins*)addr;
sljit_ins *inst = (sljit_ins*)ptr[0];
sljit_uw ldr_literal = ptr[1];
sljit_uw src2;
SLJIT_UNUSED_ARG(executable_offset);
src2 = get_imm(new_constant);
if (src2) {
if (flush_cache) {
SLJIT_UPDATE_WX_FLAGS(inst, inst + 1, 0);
}
*inst = 0xe3a00000 | (ldr_literal & 0xf000) | src2;
if (flush_cache) {
SLJIT_UPDATE_WX_FLAGS(inst, inst + 1, 1);
inst = (sljit_ins*)SLJIT_ADD_EXEC_OFFSET(inst, executable_offset);
SLJIT_CACHE_FLUSH(inst, inst + 1);
}
return;
}
src2 = get_imm(~new_constant);
if (src2) {
if (flush_cache) {
SLJIT_UPDATE_WX_FLAGS(inst, inst + 1, 0);
}
*inst = 0xe3e00000 | (ldr_literal & 0xf000) | src2;
if (flush_cache) {
SLJIT_UPDATE_WX_FLAGS(inst, inst + 1, 1);
inst = (sljit_ins*)SLJIT_ADD_EXEC_OFFSET(inst, executable_offset);
SLJIT_CACHE_FLUSH(inst, inst + 1);
}
return;
}
if (ldr_literal & (1 << 23))
ptr = inst + ((ldr_literal & 0xfff) >> 2) + 2;
else
ptr = inst + 1;
if (*inst != ldr_literal) {
if (flush_cache) {
SLJIT_UPDATE_WX_FLAGS(inst, inst + 1, 0);
}
*inst = ldr_literal;
if (flush_cache) {
SLJIT_UPDATE_WX_FLAGS(inst, inst + 1, 1);
inst = (sljit_ins*)SLJIT_ADD_EXEC_OFFSET(inst, executable_offset);
SLJIT_CACHE_FLUSH(inst, inst + 1);
}
}
if (flush_cache) {
SLJIT_UPDATE_WX_FLAGS(ptr, ptr + 1, 0);
}
*ptr = new_constant;
if (flush_cache) {
SLJIT_UPDATE_WX_FLAGS(ptr, ptr + 1, 1);
}
#else /* !SLJIT_CONFIG_ARM_V6 */
sljit_ins *inst = (sljit_ins*)addr;
SLJIT_UNUSED_ARG(executable_offset);
SLJIT_ASSERT((inst[0] & 0xfff00000) == MOVW && (inst[1] & 0xfff00000) == MOVT);
if (flush_cache) {
SLJIT_UPDATE_WX_FLAGS(inst, inst + 2, 0);
}
inst[0] = MOVW | (inst[0] & 0xf000) | ((new_constant << 4) & 0xf0000) | (new_constant & 0xfff);
inst[1] = MOVT | (inst[1] & 0xf000) | ((new_constant >> 12) & 0xf0000) | ((new_constant >> 16) & 0xfff);
if (flush_cache) {
SLJIT_UPDATE_WX_FLAGS(inst, inst + 2, 1);
inst = (sljit_ins*)SLJIT_ADD_EXEC_OFFSET(inst, executable_offset);
SLJIT_CACHE_FLUSH(inst, inst + 2);
}
#endif /* SLJIT_CONFIG_ARM_V6 */
}
SLJIT_API_FUNC_ATTRIBUTE void* sljit_generate_code(struct sljit_compiler *compiler)
{
struct sljit_memory_fragment *buf;
sljit_ins *code;
sljit_ins *code_ptr;
sljit_ins *buf_ptr;
sljit_ins *buf_end;
sljit_uw size;
sljit_uw word_count;
sljit_uw next_addr;
sljit_sw executable_offset;
sljit_uw addr;
#if (defined SLJIT_CONFIG_ARM_V6 && SLJIT_CONFIG_ARM_V6)
sljit_uw cpool_size;
sljit_uw cpool_skip_alignment;
sljit_uw cpool_current_index;
sljit_ins *cpool_start_address;
sljit_ins *last_pc_patch;
struct future_patch *first_patch;
#endif
struct sljit_label *label;
struct sljit_jump *jump;
struct sljit_const *const_;
struct sljit_put_label *put_label;
CHECK_ERROR_PTR();
CHECK_PTR(check_sljit_generate_code(compiler));
reverse_buf(compiler);
/* Second code generation pass. */
#if (defined SLJIT_CONFIG_ARM_V6 && SLJIT_CONFIG_ARM_V6)
size = compiler->size + (compiler->patches << 1);
if (compiler->cpool_fill > 0)
size += compiler->cpool_fill + CONST_POOL_ALIGNMENT - 1;
#else /* !SLJIT_CONFIG_ARM_V6 */
size = compiler->size;
#endif /* SLJIT_CONFIG_ARM_V6 */
code = (sljit_ins*)SLJIT_MALLOC_EXEC(size * sizeof(sljit_ins), compiler->exec_allocator_data);
PTR_FAIL_WITH_EXEC_IF(code);
buf = compiler->buf;
#if (defined SLJIT_CONFIG_ARM_V6 && SLJIT_CONFIG_ARM_V6)
cpool_size = 0;
cpool_skip_alignment = 0;
cpool_current_index = 0;
cpool_start_address = NULL;
first_patch = NULL;
last_pc_patch = code;
#endif /* SLJIT_CONFIG_ARM_V6 */
code_ptr = code;
word_count = 0;
next_addr = 1;
executable_offset = SLJIT_EXEC_OFFSET(code);
label = compiler->labels;
jump = compiler->jumps;
const_ = compiler->consts;
put_label = compiler->put_labels;
if (label && label->size == 0) {
label->addr = (sljit_uw)SLJIT_ADD_EXEC_OFFSET(code, executable_offset);
label = label->next;
}
do {
buf_ptr = (sljit_ins*)buf->memory;
buf_end = buf_ptr + (buf->used_size >> 2);
do {
word_count++;
#if (defined SLJIT_CONFIG_ARM_V6 && SLJIT_CONFIG_ARM_V6)
if (cpool_size > 0) {
if (cpool_skip_alignment > 0) {
buf_ptr++;
cpool_skip_alignment--;
}
else {
if (SLJIT_UNLIKELY(resolve_const_pool_index(compiler, &first_patch, cpool_current_index, cpool_start_address, buf_ptr))) {
SLJIT_FREE_EXEC(code, compiler->exec_allocator_data);
compiler->error = SLJIT_ERR_ALLOC_FAILED;
return NULL;
}
buf_ptr++;
if (++cpool_current_index >= cpool_size) {
SLJIT_ASSERT(!first_patch);
cpool_size = 0;
if (label && label->size == word_count) {
/* Points after the current instruction. */
label->addr = (sljit_uw)SLJIT_ADD_EXEC_OFFSET(code_ptr, executable_offset);
label->size = (sljit_uw)(code_ptr - code);
label = label->next;
next_addr = compute_next_addr(label, jump, const_, put_label);
}
}
}
}
else if ((*buf_ptr & 0xff000000) != PUSH_POOL) {
#endif /* SLJIT_CONFIG_ARM_V6 */
*code_ptr = *buf_ptr++;
if (next_addr == word_count) {
SLJIT_ASSERT(!label || label->size >= word_count);
SLJIT_ASSERT(!jump || jump->addr >= word_count);
SLJIT_ASSERT(!const_ || const_->addr >= word_count);
SLJIT_ASSERT(!put_label || put_label->addr >= word_count);
/* These structures are ordered by their address. */
if (jump && jump->addr == word_count) {
#if (defined SLJIT_CONFIG_ARM_V6 && SLJIT_CONFIG_ARM_V6)
if (detect_jump_type(jump, code_ptr, code, executable_offset))
code_ptr--;
jump->addr = (sljit_uw)code_ptr;
#else /* !SLJIT_CONFIG_ARM_V6 */
jump->addr = (sljit_uw)(code_ptr - 2);
if (detect_jump_type(jump, code_ptr, code, executable_offset))
code_ptr -= 2;
#endif /* SLJIT_CONFIG_ARM_V6 */
jump = jump->next;
}
if (label && label->size == word_count) {
/* code_ptr can be affected above. */
label->addr = (sljit_uw)SLJIT_ADD_EXEC_OFFSET(code_ptr + 1, executable_offset);
label->size = (sljit_uw)((code_ptr + 1) - code);
label = label->next;
}
if (const_ && const_->addr == word_count) {
#if (defined SLJIT_CONFIG_ARM_V6 && SLJIT_CONFIG_ARM_V6)
const_->addr = (sljit_uw)code_ptr;
#else /* !SLJIT_CONFIG_ARM_V6 */
const_->addr = (sljit_uw)(code_ptr - 1);
#endif /* SLJIT_CONFIG_ARM_V6 */
const_ = const_->next;
}
if (put_label && put_label->addr == word_count) {
SLJIT_ASSERT(put_label->label);
put_label->addr = (sljit_uw)code_ptr;
put_label = put_label->next;
}
next_addr = compute_next_addr(label, jump, const_, put_label);
}
code_ptr++;
#if (defined SLJIT_CONFIG_ARM_V6 && SLJIT_CONFIG_ARM_V6)
} else {
/* Fortunately, no need to shift. */
cpool_size = *buf_ptr++ & ~PUSH_POOL;
SLJIT_ASSERT(cpool_size > 0);
cpool_start_address = ALIGN_INSTRUCTION(code_ptr + 1);
cpool_current_index = patch_pc_relative_loads(last_pc_patch, code_ptr, cpool_start_address, cpool_size);
if (cpool_current_index > 0) {
/* Unconditional branch. */
*code_ptr = B | (((sljit_ins)(cpool_start_address - code_ptr) + cpool_current_index - 2) & ~PUSH_POOL);
code_ptr = (sljit_ins*)(cpool_start_address + cpool_current_index);
}
cpool_skip_alignment = CONST_POOL_ALIGNMENT - 1;
cpool_current_index = 0;
last_pc_patch = code_ptr;
}
#endif /* SLJIT_CONFIG_ARM_V6 */
} while (buf_ptr < buf_end);
buf = buf->next;
} while (buf);
SLJIT_ASSERT(!label);
SLJIT_ASSERT(!jump);
SLJIT_ASSERT(!const_);
SLJIT_ASSERT(!put_label);
#if (defined SLJIT_CONFIG_ARM_V6 && SLJIT_CONFIG_ARM_V6)
SLJIT_ASSERT(cpool_size == 0);
if (compiler->cpool_fill > 0) {
cpool_start_address = ALIGN_INSTRUCTION(code_ptr);
cpool_current_index = patch_pc_relative_loads(last_pc_patch, code_ptr, cpool_start_address, compiler->cpool_fill);
if (cpool_current_index > 0)
code_ptr = (sljit_ins*)(cpool_start_address + cpool_current_index);
buf_ptr = compiler->cpool;
buf_end = buf_ptr + compiler->cpool_fill;
cpool_current_index = 0;
while (buf_ptr < buf_end) {
if (SLJIT_UNLIKELY(resolve_const_pool_index(compiler, &first_patch, cpool_current_index, cpool_start_address, buf_ptr))) {
SLJIT_FREE_EXEC(code, compiler->exec_allocator_data);
compiler->error = SLJIT_ERR_ALLOC_FAILED;
return NULL;
}
buf_ptr++;
cpool_current_index++;
}
SLJIT_ASSERT(!first_patch);
}
#endif
jump = compiler->jumps;
while (jump) {
buf_ptr = (sljit_ins*)jump->addr;
if (jump->flags & PATCH_B) {
addr = (sljit_uw)SLJIT_ADD_EXEC_OFFSET(buf_ptr + 2, executable_offset);
if (!(jump->flags & JUMP_ADDR)) {
SLJIT_ASSERT(jump->flags & JUMP_LABEL);
SLJIT_ASSERT((sljit_sw)(jump->u.label->addr - addr) <= 0x01ffffff && (sljit_sw)(jump->u.label->addr - addr) >= -0x02000000);
*buf_ptr |= ((jump->u.label->addr - addr) >> 2) & 0x00ffffff;
}
else {
SLJIT_ASSERT((sljit_sw)(jump->u.target - addr) <= 0x01ffffff && (sljit_sw)(jump->u.target - addr) >= -0x02000000);
*buf_ptr |= ((jump->u.target - addr) >> 2) & 0x00ffffff;
}
}
else if (jump->flags & SLJIT_REWRITABLE_JUMP) {
#if (defined SLJIT_CONFIG_ARM_V6 && SLJIT_CONFIG_ARM_V6)
jump->addr = (sljit_uw)code_ptr;
code_ptr[0] = (sljit_ins)buf_ptr;
code_ptr[1] = *buf_ptr;
inline_set_jump_addr((sljit_uw)code_ptr, executable_offset, (jump->flags & JUMP_LABEL) ? jump->u.label->addr : jump->u.target, 0);
code_ptr += 2;
#else /* !SLJIT_CONFIG_ARM_V6 */
inline_set_jump_addr((sljit_uw)buf_ptr, executable_offset, (jump->flags & JUMP_LABEL) ? jump->u.label->addr : jump->u.target, 0);
#endif /* SLJIT_CONFIG_ARM_V6 */
} else {
#if (defined SLJIT_CONFIG_ARM_V6 && SLJIT_CONFIG_ARM_V6)
if (jump->flags & IS_BL)
buf_ptr--;
if (*buf_ptr & (1 << 23))
buf_ptr += ((*buf_ptr & 0xfff) >> 2) + 2;
else
buf_ptr += 1;
*buf_ptr = (jump->flags & JUMP_LABEL) ? jump->u.label->addr : jump->u.target;
#else /* !SLJIT_CONFIG_ARM_V6 */
inline_set_jump_addr((sljit_uw)buf_ptr, executable_offset, (jump->flags & JUMP_LABEL) ? jump->u.label->addr : jump->u.target, 0);
#endif /* SLJIT_CONFIG_ARM_V6 */
}
jump = jump->next;
}
#if (defined SLJIT_CONFIG_ARM_V6 && SLJIT_CONFIG_ARM_V6)
const_ = compiler->consts;
while (const_) {
buf_ptr = (sljit_ins*)const_->addr;
const_->addr = (sljit_uw)code_ptr;
code_ptr[0] = (sljit_ins)buf_ptr;
code_ptr[1] = *buf_ptr;
if (*buf_ptr & (1 << 23))
buf_ptr += ((*buf_ptr & 0xfff) >> 2) + 2;
else
buf_ptr += 1;
/* Set the value again (can be a simple constant). */
inline_set_const((sljit_uw)code_ptr, executable_offset, *buf_ptr, 0);
code_ptr += 2;
const_ = const_->next;
}
#endif /* SLJIT_CONFIG_ARM_V6 */
put_label = compiler->put_labels;
while (put_label) {
addr = put_label->label->addr;
buf_ptr = (sljit_ins*)put_label->addr;
#if (defined SLJIT_CONFIG_ARM_V6 && SLJIT_CONFIG_ARM_V6)
SLJIT_ASSERT((buf_ptr[0] & 0xffff0000) == 0xe59f0000);
buf_ptr[((buf_ptr[0] & 0xfff) >> 2) + 2] = addr;
#else /* !SLJIT_CONFIG_ARM_V6 */
SLJIT_ASSERT((buf_ptr[-1] & 0xfff00000) == MOVW && (buf_ptr[0] & 0xfff00000) == MOVT);
buf_ptr[-1] |= ((addr << 4) & 0xf0000) | (addr & 0xfff);
buf_ptr[0] |= ((addr >> 12) & 0xf0000) | ((addr >> 16) & 0xfff);
#endif /* SLJIT_CONFIG_ARM_V6 */
put_label = put_label->next;
}
SLJIT_ASSERT(code_ptr - code <= (sljit_s32)size);
compiler->error = SLJIT_ERR_COMPILED;
compiler->executable_offset = executable_offset;
compiler->executable_size = (sljit_uw)(code_ptr - code) * sizeof(sljit_uw);
code = (sljit_ins*)SLJIT_ADD_EXEC_OFFSET(code, executable_offset);
code_ptr = (sljit_ins*)SLJIT_ADD_EXEC_OFFSET(code_ptr, executable_offset);