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circuitpython/py/emitinlinethumb.c

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/*
* This file is part of the Micro Python project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2013, 2014 Damien P. George
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include <stdint.h>
#include <stdio.h>
#include <string.h>
#include <stdarg.h>
#include <assert.h>
#include "py/emit.h"
#include "py/asmthumb.h"
#if MICROPY_EMIT_INLINE_THUMB
typedef enum {
#define DEF_RULE(rule, comp, kind, ...) PN_##rule,
#include "py/grammar.h"
#undef DEF_RULE
PN_maximum_number_of,
} pn_kind_t;
struct _emit_inline_asm_t {
uint16_t pass;
scope_t *scope;
mp_obj_t *error_slot;
mp_uint_t max_num_labels;
qstr *label_lookup;
asm_thumb_t *as;
};
STATIC void emit_inline_thumb_error_msg(emit_inline_asm_t *emit, const char *msg) {
*emit->error_slot = mp_obj_new_exception_msg(&mp_type_SyntaxError, msg);
}
STATIC void emit_inline_thumb_error_exc(emit_inline_asm_t *emit, mp_obj_t exc) {
*emit->error_slot = exc;
}
emit_inline_asm_t *emit_inline_thumb_new(mp_uint_t max_num_labels) {
emit_inline_asm_t *emit = m_new_obj(emit_inline_asm_t);
emit->max_num_labels = max_num_labels;
emit->label_lookup = m_new(qstr, max_num_labels);
emit->as = asm_thumb_new(max_num_labels);
return emit;
}
void emit_inline_thumb_free(emit_inline_asm_t *emit) {
m_del(qstr, emit->label_lookup, emit->max_num_labels);
asm_thumb_free(emit->as, false);
m_del_obj(emit_inline_asm_t, emit);
}
STATIC void emit_inline_thumb_start_pass(emit_inline_asm_t *emit, pass_kind_t pass, scope_t *scope, mp_obj_t *error_slot) {
emit->pass = pass;
emit->scope = scope;
emit->error_slot = error_slot;
if (emit->pass == MP_PASS_CODE_SIZE) {
memset(emit->label_lookup, 0, emit->max_num_labels * sizeof(qstr));
}
asm_thumb_start_pass(emit->as, pass == MP_PASS_EMIT ? ASM_THUMB_PASS_EMIT : ASM_THUMB_PASS_COMPUTE);
asm_thumb_entry(emit->as, 0);
}
STATIC void emit_inline_thumb_end_pass(emit_inline_asm_t *emit) {
asm_thumb_exit(emit->as);
asm_thumb_end_pass(emit->as);
if (emit->pass == MP_PASS_EMIT) {
void *f = asm_thumb_get_code(emit->as);
mp_emit_glue_assign_native(emit->scope->raw_code, MP_CODE_NATIVE_ASM, f, asm_thumb_get_code_size(emit->as), emit->scope->num_pos_args, 0);
}
}
STATIC mp_uint_t emit_inline_thumb_count_params(emit_inline_asm_t *emit, mp_uint_t n_params, mp_parse_node_t *pn_params) {
if (n_params > 4) {
emit_inline_thumb_error_msg(emit, "can only have up to 4 parameters to Thumb assembly");
return 0;
}
for (mp_uint_t i = 0; i < n_params; i++) {
if (!MP_PARSE_NODE_IS_ID(pn_params[i])) {
emit_inline_thumb_error_msg(emit, "parameters must be registers in sequence r0 to r3");
return 0;
}
const char *p = qstr_str(MP_PARSE_NODE_LEAF_ARG(pn_params[i]));
if (!(strlen(p) == 2 && p[0] == 'r' && p[1] == '0' + i)) {
emit_inline_thumb_error_msg(emit, "parameters must be registers in sequence r0 to r3");
return 0;
}
}
return n_params;
}
STATIC bool emit_inline_thumb_label(emit_inline_asm_t *emit, mp_uint_t label_num, qstr label_id) {
assert(label_num < emit->max_num_labels);
if (emit->pass == MP_PASS_CODE_SIZE) {
// check for duplicate label on first pass
for (int i = 0; i < emit->max_num_labels; i++) {
if (emit->label_lookup[i] == label_id) {
return false;
}
}
}
emit->label_lookup[label_num] = label_id;
asm_thumb_label_assign(emit->as, label_num);
return true;
}
STATIC void emit_inline_thumb_align(emit_inline_asm_t *emit, mp_uint_t align) {
asm_thumb_align(emit->as, align);
}
STATIC void emit_inline_thumb_data(emit_inline_asm_t *emit, mp_uint_t bytesize, mp_uint_t val) {
asm_thumb_data(emit->as, bytesize, val);
}
typedef struct _reg_name_t { byte reg; byte name[3]; } reg_name_t;
STATIC const reg_name_t reg_name_table[] = {
{0, "r0\0"},
{1, "r1\0"},
{2, "r2\0"},
{3, "r3\0"},
{4, "r4\0"},
{5, "r5\0"},
{6, "r6\0"},
{7, "r7\0"},
{8, "r8\0"},
{9, "r9\0"},
{10, "r10"},
{11, "r11"},
{12, "r12"},
{13, "r13"},
{14, "r14"},
{15, "r15"},
{10, "sl\0"},
{11, "fp\0"},
{13, "sp\0"},
{14, "lr\0"},
{15, "pc\0"},
};
// return empty string in case of error, so we can attempt to parse the string
// without a special check if it was in fact a string
STATIC const char *get_arg_str(mp_parse_node_t pn) {
if (MP_PARSE_NODE_IS_ID(pn)) {
qstr qst = MP_PARSE_NODE_LEAF_ARG(pn);
return qstr_str(qst);
} else {
return "";
}
}
STATIC mp_uint_t get_arg_reg(emit_inline_asm_t *emit, const char *op, mp_parse_node_t pn, mp_uint_t max_reg) {
const char *reg_str = get_arg_str(pn);
for (mp_uint_t i = 0; i < MP_ARRAY_SIZE(reg_name_table); i++) {
const reg_name_t *r = &reg_name_table[i];
if (reg_str[0] == r->name[0]
&& reg_str[1] == r->name[1]
&& reg_str[2] == r->name[2]
&& (reg_str[2] == '\0' || reg_str[3] == '\0')) {
if (r->reg > max_reg) {
emit_inline_thumb_error_exc(emit,
mp_obj_new_exception_msg_varg(&mp_type_SyntaxError,
"'%s' expects at most r%d", op, max_reg));
return 0;
} else {
return r->reg;
}
}
}
emit_inline_thumb_error_exc(emit,
mp_obj_new_exception_msg_varg(&mp_type_SyntaxError,
"'%s' expects a register", op));
return 0;
}
STATIC mp_uint_t get_arg_reglist(emit_inline_asm_t *emit, const char *op, mp_parse_node_t pn) {
// a register list looks like {r0, r1, r2} and is parsed as a Python set
if (!MP_PARSE_NODE_IS_STRUCT_KIND(pn, PN_atom_brace)) {
goto bad_arg;
}
mp_parse_node_struct_t *pns = (mp_parse_node_struct_t*)pn;
assert(MP_PARSE_NODE_STRUCT_NUM_NODES(pns) == 1); // should always be
pn = pns->nodes[0];
mp_uint_t reglist = 0;
if (MP_PARSE_NODE_IS_ID(pn)) {
// set with one element
reglist |= 1 << get_arg_reg(emit, op, pn, 15);
} else if (MP_PARSE_NODE_IS_STRUCT(pn)) {
pns = (mp_parse_node_struct_t*)pn;
if (MP_PARSE_NODE_STRUCT_KIND(pns) == PN_dictorsetmaker) {
assert(MP_PARSE_NODE_IS_STRUCT(pns->nodes[1])); // should succeed
mp_parse_node_struct_t *pns1 = (mp_parse_node_struct_t*)pns->nodes[1];
if (MP_PARSE_NODE_STRUCT_KIND(pns1) == PN_dictorsetmaker_list) {
// set with multiple elements
// get first element of set (we rely on get_arg_reg to catch syntax errors)
reglist |= 1 << get_arg_reg(emit, op, pns->nodes[0], 15);
// get tail elements (2nd, 3rd, ...)
mp_parse_node_t *nodes;
int n = mp_parse_node_extract_list(&pns1->nodes[0], PN_dictorsetmaker_list2, &nodes);
// process rest of elements
for (int i = 0; i < n; i++) {
reglist |= 1 << get_arg_reg(emit, op, nodes[i], 15);
}
} else {
goto bad_arg;
}
} else {
goto bad_arg;
}
} else {
goto bad_arg;
}
return reglist;
bad_arg:
emit_inline_thumb_error_exc(emit, mp_obj_new_exception_msg_varg(&mp_type_SyntaxError, "'%s' expects {r0, r1, ...}", op));
return 0;
}
STATIC int get_arg_i(emit_inline_asm_t *emit, const char *op, mp_parse_node_t pn, int fit_mask) {
if (!MP_PARSE_NODE_IS_SMALL_INT(pn)) {
emit_inline_thumb_error_exc(emit, mp_obj_new_exception_msg_varg(&mp_type_SyntaxError, "'%s' expects an integer", op));
return 0;
}
int i = MP_PARSE_NODE_LEAF_SMALL_INT(pn);
if ((i & (~fit_mask)) != 0) {
emit_inline_thumb_error_exc(emit, mp_obj_new_exception_msg_varg(&mp_type_SyntaxError, "'%s' integer 0x%x does not fit in mask 0x%x", op, i, fit_mask));
return 0;
}
return i;
}
STATIC bool get_arg_addr(emit_inline_asm_t *emit, const char *op, mp_parse_node_t pn, mp_parse_node_t *pn_base, mp_parse_node_t *pn_offset) {
if (!MP_PARSE_NODE_IS_STRUCT_KIND(pn, PN_atom_bracket)) {
goto bad_arg;
}
mp_parse_node_struct_t *pns = (mp_parse_node_struct_t*)pn;
if (!MP_PARSE_NODE_IS_STRUCT_KIND(pns->nodes[0], PN_testlist_comp)) {
goto bad_arg;
}
pns = (mp_parse_node_struct_t*)pns->nodes[0];
if (MP_PARSE_NODE_STRUCT_NUM_NODES(pns) != 2) {
goto bad_arg;
}
*pn_base = pns->nodes[0];
*pn_offset = pns->nodes[1];
return true;
bad_arg:
emit_inline_thumb_error_exc(emit, mp_obj_new_exception_msg_varg(&mp_type_SyntaxError, "'%s' expects an address of the form [a, b]", op));
return false;
}
STATIC int get_arg_label(emit_inline_asm_t *emit, const char *op, mp_parse_node_t pn) {
if (!MP_PARSE_NODE_IS_ID(pn)) {
emit_inline_thumb_error_exc(emit, mp_obj_new_exception_msg_varg(&mp_type_SyntaxError, "'%s' expects a label", op));
return 0;
}
qstr label_qstr = MP_PARSE_NODE_LEAF_ARG(pn);
for (int i = 0; i < emit->max_num_labels; i++) {
if (emit->label_lookup[i] == label_qstr) {
return i;
}
}
// only need to have the labels on the last pass
if (emit->pass == MP_PASS_EMIT) {
emit_inline_thumb_error_exc(emit, mp_obj_new_exception_msg_varg(&mp_type_SyntaxError, "label '%s' not defined", qstr_str(label_qstr)));
}
return 0;
}
typedef struct _cc_name_t { byte cc; byte name[2]; } cc_name_t;
STATIC const cc_name_t cc_name_table[] = {
{ ASM_THUMB_CC_EQ, "eq" },
{ ASM_THUMB_CC_NE, "ne" },
{ ASM_THUMB_CC_CS, "cs" },
{ ASM_THUMB_CC_CC, "cc" },
{ ASM_THUMB_CC_MI, "mi" },
{ ASM_THUMB_CC_PL, "pl" },
{ ASM_THUMB_CC_VS, "vs" },
{ ASM_THUMB_CC_VC, "vc" },
{ ASM_THUMB_CC_HI, "hi" },
{ ASM_THUMB_CC_LS, "ls" },
{ ASM_THUMB_CC_GE, "ge" },
{ ASM_THUMB_CC_LT, "lt" },
{ ASM_THUMB_CC_GT, "gt" },
{ ASM_THUMB_CC_LE, "le" },
};
typedef struct _format_4_op_t { byte op; char name[3]; } format_4_op_t;
#define X(x) (((x) >> 4) & 0xff) // only need 1 byte to distinguish these ops
STATIC const format_4_op_t format_4_op_table[] = {
{ X(ASM_THUMB_FORMAT_4_EOR), "eor" },
{ X(ASM_THUMB_FORMAT_4_LSL), "lsl" },
{ X(ASM_THUMB_FORMAT_4_LSR), "lsr" },
{ X(ASM_THUMB_FORMAT_4_ASR), "asr" },
{ X(ASM_THUMB_FORMAT_4_ADC), "adc" },
{ X(ASM_THUMB_FORMAT_4_SBC), "sbc" },
{ X(ASM_THUMB_FORMAT_4_ROR), "ror" },
{ X(ASM_THUMB_FORMAT_4_TST), "tst" },
{ X(ASM_THUMB_FORMAT_4_NEG), "neg" },
{ X(ASM_THUMB_FORMAT_4_CMP), "cmp" },
{ X(ASM_THUMB_FORMAT_4_CMN), "cmn" },
{ X(ASM_THUMB_FORMAT_4_ORR), "orr" },
{ X(ASM_THUMB_FORMAT_4_MUL), "mul" },
{ X(ASM_THUMB_FORMAT_4_BIC), "bic" },
{ X(ASM_THUMB_FORMAT_4_MVN), "mvn" },
};
#undef X
typedef struct _format_9_10_op_t { uint16_t op; char name[5]; } format_9_10_op_t;
#define X(x) (x)
STATIC const format_9_10_op_t format_9_10_op_table[] = {
{ X(ASM_THUMB_FORMAT_9_LDR | ASM_THUMB_FORMAT_9_WORD_TRANSFER), "ldr" },
{ X(ASM_THUMB_FORMAT_9_LDR | ASM_THUMB_FORMAT_9_BYTE_TRANSFER), "ldrb" },
{ X(ASM_THUMB_FORMAT_10_LDRH), "ldrh" },
{ X(ASM_THUMB_FORMAT_9_STR | ASM_THUMB_FORMAT_9_WORD_TRANSFER), "str" },
{ X(ASM_THUMB_FORMAT_9_STR | ASM_THUMB_FORMAT_9_BYTE_TRANSFER), "strb" },
{ X(ASM_THUMB_FORMAT_10_STRH), "strh" },
};
#undef X
STATIC void emit_inline_thumb_op(emit_inline_asm_t *emit, qstr op, mp_uint_t n_args, mp_parse_node_t *pn_args) {
// TODO perhaps make two tables:
// one_args =
// "b", LAB, asm_thumb_b_n,
// "bgt", LAB, asm_thumb_bgt_n,
// two_args =
// "movs", RLO, I8, asm_thumb_movs_reg_i8
// "movw", REG, REG, asm_thumb_movw_reg_i16
// three_args =
// "subs", RLO, RLO, I3, asm_thumb_subs_reg_reg_i3
const char *op_str = qstr_str(op);
mp_uint_t op_len = strlen(op_str);
if (n_args == 0) {
if (strcmp(op_str, "nop") == 0) {
asm_thumb_op16(emit->as, ASM_THUMB_OP_NOP);
} else if (strcmp(op_str, "wfi") == 0) {
asm_thumb_op16(emit->as, ASM_THUMB_OP_WFI);
} else {
goto unknown_op;
}
} else if (n_args == 1) {
if (strcmp(op_str, "b") == 0) {
int label_num = get_arg_label(emit, op_str, pn_args[0]);
if (!asm_thumb_b_n_label(emit->as, label_num)) {
goto branch_not_in_range;
}
} else if (strcmp(op_str, "bl") == 0) {
int label_num = get_arg_label(emit, op_str, pn_args[0]);
if (!asm_thumb_bl_label(emit->as, label_num)) {
goto branch_not_in_range;
}
} else if (strcmp(op_str, "bx") == 0) {
mp_uint_t r = get_arg_reg(emit, op_str, pn_args[0], 15);
asm_thumb_op16(emit->as, 0x4700 | (r << 3));
} else if (op_str[0] == 'b' && (op_len == 3
|| (op_len == 5 && op_str[3] == '_'
&& (op_str[4] == 'n' || op_str[4] == 'w')))) {
mp_uint_t cc = -1;
for (mp_uint_t i = 0; i < MP_ARRAY_SIZE(cc_name_table); i++) {
if (op_str[1] == cc_name_table[i].name[0] && op_str[2] == cc_name_table[i].name[1]) {
cc = cc_name_table[i].cc;
}
}
if (cc == -1) {
goto unknown_op;
}
int label_num = get_arg_label(emit, op_str, pn_args[0]);
if (!asm_thumb_bcc_nw_label(emit->as, cc, label_num, op_len == 5 && op_str[4] == 'w')) {
goto branch_not_in_range;
}
} else if (op_str[0] == 'i' && op_str[1] == 't') {
const char *arg_str = get_arg_str(pn_args[0]);
mp_uint_t cc = -1;
for (mp_uint_t i = 0; i < MP_ARRAY_SIZE(cc_name_table); i++) {
if (arg_str[0] == cc_name_table[i].name[0]
&& arg_str[1] == cc_name_table[i].name[1]
&& arg_str[2] == '\0') {
cc = cc_name_table[i].cc;
break;
}
}
if (cc == -1) {
goto unknown_op;
}
const char *os = op_str + 2;
while (*os != '\0') {
os++;
}
if (os > op_str + 5) {
goto unknown_op;
}
mp_uint_t it_mask = 8;
while (--os >= op_str + 2) {
it_mask >>= 1;
if (*os == 't') {
it_mask |= (cc & 1) << 3;
} else if (*os == 'e') {
it_mask |= ((~cc) & 1) << 3;
} else {
goto unknown_op;
}
}
asm_thumb_it_cc(emit->as, cc, it_mask);
} else if (strcmp(op_str, "cpsid") == 0) {
// TODO check pn_args[0] == i
asm_thumb_op16(emit->as, ASM_THUMB_OP_CPSID_I);
} else if (strcmp(op_str, "cpsie") == 0) {
// TODO check pn_args[0] == i
asm_thumb_op16(emit->as, ASM_THUMB_OP_CPSIE_I);
} else if (strcmp(op_str, "push") == 0) {
mp_uint_t reglist = get_arg_reglist(emit, op_str, pn_args[0]);
if ((reglist & 0xff00) == 0) {
asm_thumb_op16(emit->as, 0xb400 | reglist);
} else {
asm_thumb_op32(emit->as, 0xe92d, reglist);
}
} else if (strcmp(op_str, "pop") == 0) {
mp_uint_t reglist = get_arg_reglist(emit, op_str, pn_args[0]);
if ((reglist & 0xff00) == 0) {
asm_thumb_op16(emit->as, 0xbc00 | reglist);
} else {
asm_thumb_op32(emit->as, 0xe8bd, reglist);
}
} else {
goto unknown_op;
}
} else if (n_args == 2) {
if (MP_PARSE_NODE_IS_ID(pn_args[1])) {
// second arg is a register (or should be)
mp_uint_t op_code, op_code_hi;
if (strcmp(op_str, "mov") == 0) {
mp_uint_t reg_dest = get_arg_reg(emit, op_str, pn_args[0], 15);
mp_uint_t reg_src = get_arg_reg(emit, op_str, pn_args[1], 15);
asm_thumb_mov_reg_reg(emit->as, reg_dest, reg_src);
} else if (strcmp(op_str, "clz") == 0) {
op_code_hi = 0xfab0;
op_code = 0xf080;
mp_uint_t rd, rm;
op_clz_rbit:
rd = get_arg_reg(emit, op_str, pn_args[0], 15);
rm = get_arg_reg(emit, op_str, pn_args[1], 15);
asm_thumb_op32(emit->as, op_code_hi | rm, op_code | (rd << 8) | rm);
} else if (strcmp(op_str, "rbit") == 0) {
op_code_hi = 0xfa90;
op_code = 0xf0a0;
goto op_clz_rbit;
} else {
if (strcmp(op_str, "and_") == 0) {
op_code = ASM_THUMB_FORMAT_4_AND;
mp_uint_t reg_dest, reg_src;
op_format_4:
reg_dest = get_arg_reg(emit, op_str, pn_args[0], 7);
reg_src = get_arg_reg(emit, op_str, pn_args[1], 7);
asm_thumb_format_4(emit->as, op_code, reg_dest, reg_src);
return;
}
// search table for ALU ops
for (mp_uint_t i = 0; i < MP_ARRAY_SIZE(format_4_op_table); i++) {
if (strncmp(op_str, format_4_op_table[i].name, 3) == 0 && op_str[3] == '\0') {
op_code = 0x4000 | (format_4_op_table[i].op << 4);
goto op_format_4;
}
}
goto unknown_op;
}
} else {
// second arg is not a register
mp_uint_t op_code;
if (strcmp(op_str, "mov") == 0) {
op_code = ASM_THUMB_FORMAT_3_MOV;
mp_uint_t rlo_dest, i8_src;
op_format_3:
rlo_dest = get_arg_reg(emit, op_str, pn_args[0], 7);
i8_src = get_arg_i(emit, op_str, pn_args[1], 0xff);
asm_thumb_format_3(emit->as, op_code, rlo_dest, i8_src);
} else if (strcmp(op_str, "cmp") == 0) {
op_code = ASM_THUMB_FORMAT_3_CMP;
goto op_format_3;
} else if (strcmp(op_str, "add") == 0) {
op_code = ASM_THUMB_FORMAT_3_ADD;
goto op_format_3;
} else if (strcmp(op_str, "sub") == 0) {
op_code = ASM_THUMB_FORMAT_3_SUB;
goto op_format_3;
} else if (strcmp(op_str, "movw") == 0) {
op_code = ASM_THUMB_OP_MOVW;
mp_uint_t reg_dest;
op_movw_movt:
reg_dest = get_arg_reg(emit, op_str, pn_args[0], 15);
int i_src = get_arg_i(emit, op_str, pn_args[1], 0xffff);
asm_thumb_mov_reg_i16(emit->as, op_code, reg_dest, i_src);
} else if (strcmp(op_str, "movt") == 0) {
op_code = ASM_THUMB_OP_MOVT;
goto op_movw_movt;
} else if (strcmp(op_str, "movwt") == 0) {
// this is a convenience instruction
// we clear the MSB since it might be set from extracting the small int value
mp_uint_t reg_dest = get_arg_reg(emit, op_str, pn_args[0], 15);
int i_src = get_arg_i(emit, op_str, pn_args[1], 0xffffffff);
asm_thumb_mov_reg_i16(emit->as, ASM_THUMB_OP_MOVW, reg_dest, i_src & 0xffff);
asm_thumb_mov_reg_i16(emit->as, ASM_THUMB_OP_MOVT, reg_dest, (i_src >> 16) & 0x7fff);
} else if (strcmp(op_str, "ldrex") == 0) {
mp_uint_t r_dest = get_arg_reg(emit, op_str, pn_args[0], 15);
mp_parse_node_t pn_base, pn_offset;
if (get_arg_addr(emit, op_str, pn_args[1], &pn_base, &pn_offset)) {
mp_uint_t r_base = get_arg_reg(emit, op_str, pn_base, 15);
mp_uint_t i8 = get_arg_i(emit, op_str, pn_offset, 0xff) >> 2;
asm_thumb_op32(emit->as, 0xe850 | r_base, 0x0f00 | (r_dest << 12) | i8);
}
} else {
// search table for ldr/str instructions
for (mp_uint_t i = 0; i < MP_ARRAY_SIZE(format_9_10_op_table); i++) {
if (strcmp(op_str, format_9_10_op_table[i].name) == 0) {
op_code = format_9_10_op_table[i].op;
mp_parse_node_t pn_base, pn_offset;
mp_uint_t rlo_dest = get_arg_reg(emit, op_str, pn_args[0], 7);
if (get_arg_addr(emit, op_str, pn_args[1], &pn_base, &pn_offset)) {
mp_uint_t rlo_base = get_arg_reg(emit, op_str, pn_base, 7);
mp_uint_t i5;
if (op_code & ASM_THUMB_FORMAT_9_BYTE_TRANSFER) {
i5 = get_arg_i(emit, op_str, pn_offset, 0x1f);
} else if (op_code & ASM_THUMB_FORMAT_10_STRH) { // also catches LDRH
i5 = get_arg_i(emit, op_str, pn_offset, 0x3e) >> 1;
} else {
i5 = get_arg_i(emit, op_str, pn_offset, 0x7c) >> 2;
}
asm_thumb_format_9_10(emit->as, op_code, rlo_dest, rlo_base, i5);
return;
}
break;
}
}
goto unknown_op;
}
}
} else if (n_args == 3) {
mp_uint_t op_code;
if (strcmp(op_str, "add") == 0) {
op_code = ASM_THUMB_FORMAT_2_ADD;
mp_uint_t rlo_dest, rlo_src;
op_format_2:
rlo_dest = get_arg_reg(emit, op_str, pn_args[0], 7);
rlo_src = get_arg_reg(emit, op_str, pn_args[1], 7);
int src_b;
if (MP_PARSE_NODE_IS_ID(pn_args[2])) {
op_code |= ASM_THUMB_FORMAT_2_REG_OPERAND;
src_b = get_arg_reg(emit, op_str, pn_args[2], 7);
} else {
op_code |= ASM_THUMB_FORMAT_2_IMM_OPERAND;
src_b = get_arg_i(emit, op_str, pn_args[2], 0x7);
}
asm_thumb_format_2(emit->as, op_code, rlo_dest, rlo_src, src_b);
} else if (strcmp(op_str, "sdiv") == 0) {
op_code = 0xfb90; // sdiv high part
mp_uint_t rd, rn, rm;
op_sdiv_udiv:
rd = get_arg_reg(emit, op_str, pn_args[0], 15);
rn = get_arg_reg(emit, op_str, pn_args[1], 15);
rm = get_arg_reg(emit, op_str, pn_args[2], 15);
asm_thumb_op32(emit->as, op_code | rn, 0xf0f0 | (rd << 8) | rm);
} else if (strcmp(op_str, "udiv") == 0) {
op_code = 0xfbb0; // udiv high part
goto op_sdiv_udiv;
} else if (strcmp(op_str, "sub") == 0) {
op_code = ASM_THUMB_FORMAT_2_SUB;
goto op_format_2;
} else if (strcmp(op_str, "strex") == 0) {
mp_uint_t r_dest = get_arg_reg(emit, op_str, pn_args[0], 15);
mp_uint_t r_src = get_arg_reg(emit, op_str, pn_args[1], 15);
mp_parse_node_t pn_base, pn_offset;
if (get_arg_addr(emit, op_str, pn_args[2], &pn_base, &pn_offset)) {
mp_uint_t r_base = get_arg_reg(emit, op_str, pn_base, 15);
mp_uint_t i8 = get_arg_i(emit, op_str, pn_offset, 0xff) >> 2;
asm_thumb_op32(emit->as, 0xe840 | r_base, (r_src << 12) | (r_dest << 8) | i8);
}
} else {
goto unknown_op;
}
} else {
goto unknown_op;
}
return;
unknown_op:
emit_inline_thumb_error_exc(emit, mp_obj_new_exception_msg_varg(&mp_type_SyntaxError, "unsupported Thumb instruction '%s' with %d arguments", op_str, n_args));
return;
branch_not_in_range:
emit_inline_thumb_error_msg(emit, "branch not in range");
return;
}
const emit_inline_asm_method_table_t emit_inline_thumb_method_table = {
emit_inline_thumb_start_pass,
emit_inline_thumb_end_pass,
emit_inline_thumb_count_params,
emit_inline_thumb_label,
emit_inline_thumb_align,
emit_inline_thumb_data,
emit_inline_thumb_op,
};
#endif // MICROPY_EMIT_INLINE_THUMB
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