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#include <unistd.h>
#include <stdlib.h>
#include <stdint.h>
#include <stdio.h>
#include <string.h>
#include <assert.h>
#include "misc.h"
#include "lexer.h"
#include "machine.h"
#include "parse.h"
#include "scope.h"
#include "runtime.h"
#include "emit.h"
#include "asmthumb.h"
#ifdef EMIT_ENABLE_THUMB
struct _emit_inline_asm_t {
int pass;
scope_t *scope;
int max_num_labels;
qstr *label_lookup;
asm_thumb_t *as;
};
emit_inline_asm_t *emit_inline_thumb_new(uint max_num_labels) {
emit_inline_asm_t *emit = m_new(emit_inline_asm_t, 1);
emit->max_num_labels = max_num_labels;
emit->label_lookup = m_new(qstr, max_num_labels);
memset(emit->label_lookup, 0, emit->max_num_labels * sizeof(qstr));
emit->as = asm_thumb_new(max_num_labels);
return emit;
}
static void emit_inline_thumb_start_pass(emit_inline_asm_t *emit, pass_kind_t pass, scope_t *scope) {
emit->pass = pass;
emit->scope = scope;
asm_thumb_start_pass(emit->as, pass);
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 == PASS_3) {
py_fun_t f = asm_thumb_get_code(emit->as);
rt_assign_inline_asm_code(emit->scope->unique_code_id, f, asm_thumb_get_code_size(emit->as), emit->scope->num_params);
}
}
static void emit_inline_thumb_label(emit_inline_asm_t *emit, int label_num, qstr label_id) {
assert(label_num < emit->max_num_labels);
emit->label_lookup[label_num] = label_id;
asm_thumb_label_assign(emit->as, label_num);
}
static bool check_n_arg(qstr op, int n_args, int wanted_n_args) {
if (wanted_n_args == n_args) {
return true;
} else {
printf("SyntaxError: '%s' expects %d arguments'\n", qstr_str(op), wanted_n_args);
return false;
}
}
static uint get_arg_rlo(qstr op, py_parse_node_t *pn_arg, int wanted_arg_num) {
if (!PY_PARSE_NODE_IS_ID(pn_arg[wanted_arg_num])) {
printf("SyntaxError: '%s' expects a register in position %d\n", qstr_str(op), wanted_arg_num);
return 0;
}
qstr reg_qstr = PY_PARSE_NODE_LEAF_ARG(pn_arg[wanted_arg_num]);
const char *reg_str = qstr_str(reg_qstr);
if (!(strlen(reg_str) == 2 && reg_str[0] == 'r' && ('0' <= reg_str[1] && reg_str[1] <= '7'))) {
printf("SyntaxError: '%s' expects a register in position %d\n", qstr_str(op), wanted_arg_num);
return 0;
}
return reg_str[1] - '0';
}
static int get_arg_i(qstr op, py_parse_node_t *pn_arg, int wanted_arg_num, int fit_mask) {
if (!PY_PARSE_NODE_IS_SMALL_INT(pn_arg[wanted_arg_num])) {
printf("SyntaxError: '%s' expects an integer in position %d\n", qstr_str(op), wanted_arg_num);
return 0;
}
int i = PY_PARSE_NODE_LEAF_ARG(pn_arg[wanted_arg_num]);
if ((i & (~fit_mask)) != 0) {
printf("SyntaxError: '%s' integer 0x%x does not fit in mask 0x%x\n", qstr_str(op), i, fit_mask);
return 0;
}
return i;
}
static int get_arg_label(emit_inline_asm_t *emit, qstr op, py_parse_node_t *pn_arg, int wanted_arg_num) {
if (!PY_PARSE_NODE_IS_ID(pn_arg[wanted_arg_num])) {
printf("SyntaxError: '%s' expects a label in position %d\n", qstr_str(op), wanted_arg_num);
return 0;
}
qstr label_qstr = PY_PARSE_NODE_LEAF_ARG(pn_arg[wanted_arg_num]);
for (int i = 0; i < emit->max_num_labels; i++) {
if (emit->label_lookup[i] == label_qstr) {
return i;
}
}
printf("SyntaxError: label '%s' not defined\n", qstr_str(label_qstr));
return 0;
}
static void emit_inline_thumb_op(emit_inline_asm_t *emit, qstr op, int n_args, py_parse_node_t *pn_arg) {
// TODO perhaps make two tables:
// 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
// 1 arg
if (strcmp(qstr_str(op), "bgt") == 0) {
if (!check_n_arg(op, n_args, 1)) {
return;
}
int label_num = get_arg_label(emit, op, pn_arg, 0);
asm_thumb_bgt_n(emit->as, label_num);
// 2 args
} else if (strcmp(qstr_str(op), "movs") == 0) {
if (!check_n_arg(op, n_args, 2)) {
return;
}
uint rlo_dest = get_arg_rlo(op, pn_arg, 0);
int i_src = get_arg_i(op, pn_arg, 1, 0xff);
asm_thumb_movs_rlo_i8(emit->as, rlo_dest, i_src);
} else if (strcmp(qstr_str(op), "movw") == 0) {
if (!check_n_arg(op, n_args, 2)) {
return;
}
uint rlo_dest = get_arg_rlo(op, pn_arg, 0); // TODO can be reg lo or hi
int i_src = get_arg_i(op, pn_arg, 1, 0xffff);
asm_thumb_movw_reg_i16(emit->as, rlo_dest, i_src);
} else if (strcmp(qstr_str(op), "cmp") == 0) {
if (!check_n_arg(op, n_args, 2)) {
return;
}
uint rlo = get_arg_rlo(op, pn_arg, 0);
int i8 = get_arg_i(op, pn_arg, 1, 0xff);
asm_thumb_cmp_rlo_i8(emit->as, rlo, i8);
// 3 args
} else if (strcmp(qstr_str(op), "subs") == 0) {
if (!check_n_arg(op, n_args, 3)) {
return;
}
uint rlo_dest = get_arg_rlo(op, pn_arg, 0);
uint rlo_src = get_arg_rlo(op, pn_arg, 1);
int i3_src = get_arg_i(op, pn_arg, 2, 0x7);
asm_thumb_subs_rlo_rlo_i3(emit->as, rlo_dest, rlo_src, i3_src);
// unknown op
} else {
printf("SyntaxError: unsupported ARM Thumb instruction '%s'\n", qstr_str(op));
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_label,
emit_inline_thumb_op,
};
#endif // EMIT_ENABLE_THUMB
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