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micropython/py/emitinlinethumb.c

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C
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#include <stdint.h>
#include <stdio.h>
#include <string.h>
#include <assert.h>
#include "misc.h"
#include "mpconfig.h"
#include "qstr.h"
#include "lexer.h"
#include "parse.h"
#include "scope.h"
#include "runtime0.h"
#include "emit.h"
#include "emitglue.h"
#include "asmthumb.h"
#if MICROPY_EMIT_INLINE_THUMB
struct _emit_inline_asm_t {
int pass;
scope_t *scope;
uint 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_obj(emit_inline_asm_t);
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;
}
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) {
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) {
void *f = asm_thumb_get_code(emit->as);
mp_emit_glue_assign_inline_asm_code(emit->scope->unique_code_id, f, asm_thumb_get_code_size(emit->as), emit->scope->num_params);
}
}
STATIC int emit_inline_thumb_count_params(emit_inline_asm_t *emit, int n_params, mp_parse_node_t *pn_params) {
if (n_params > 4) {
printf("SyntaxError: can only have up to 4 parameters to inline thumb assembly\n");
return 0;
}
for (int i = 0; i < n_params; i++) {
if (!MP_PARSE_NODE_IS_ID(pn_params[i])) {
printf("SyntaxError: parameter to inline assembler must be an identifier\n");
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)) {
printf("SyntaxError: parameter %d to inline assembler must be r%d\n", i + 1, i);
return 0;
}
}
return n_params;
}
STATIC void emit_inline_thumb_label(emit_inline_asm_t *emit, uint 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 uint get_arg_rlo(const char *op, mp_parse_node_t *pn_args, int wanted_arg_num) {
if (!MP_PARSE_NODE_IS_ID(pn_args[wanted_arg_num])) {
printf("SyntaxError: '%s' expects a register in position %d\n", op, wanted_arg_num);
return 0;
}
qstr reg_qstr = MP_PARSE_NODE_LEAF_ARG(pn_args[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", op, wanted_arg_num);
return 0;
}
return reg_str[1] - '0';
}
STATIC int get_arg_i(const char *op, mp_parse_node_t *pn_args, int wanted_arg_num, int fit_mask) {
if (!MP_PARSE_NODE_IS_SMALL_INT(pn_args[wanted_arg_num])) {
printf("SyntaxError: '%s' expects an integer in position %d\n", op, wanted_arg_num);
return 0;
}
int i = MP_PARSE_NODE_LEAF_SMALL_INT(pn_args[wanted_arg_num]);
if ((i & (~fit_mask)) != 0) {
printf("SyntaxError: '%s' integer 0x%x does not fit in mask 0x%x\n", op, i, fit_mask);
return 0;
}
return i;
}
STATIC int get_arg_label(emit_inline_asm_t *emit, const char *op, mp_parse_node_t *pn_args, int wanted_arg_num) {
if (!MP_PARSE_NODE_IS_ID(pn_args[wanted_arg_num])) {
printf("SyntaxError: '%s' expects a label in position %d\n", op, wanted_arg_num);
return 0;
}
qstr label_qstr = MP_PARSE_NODE_LEAF_ARG(pn_args[wanted_arg_num]);
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 == PASS_3) {
printf("SyntaxError: label '%s' not defined\n", 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[] = {
{THUMB_CC_EQ, "eq"},
{THUMB_CC_NE, "ne"},
{THUMB_CC_CS, "cs"},
{THUMB_CC_CC, "cc"},
{THUMB_CC_MI, "mi"},
{THUMB_CC_PL, "pl"},
{THUMB_CC_VS, "vs"},
{THUMB_CC_VC, "vc"},
{THUMB_CC_HI, "hi"},
{THUMB_CC_LS, "ls"},
{THUMB_CC_GE, "ge"},
{THUMB_CC_LT, "lt"},
{THUMB_CC_GT, "gt"},
{THUMB_CC_LE, "le"},
};
STATIC void emit_inline_thumb_op(emit_inline_asm_t *emit, qstr op, int 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);
uint op_len = strlen(op_str);
if (n_args == 0) {
if (strcmp(op_str, "ite.ge") == 0) { // TODO correct name for this op?
asm_thumb_ite_ge(emit->as);
} 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);
// TODO check that this succeeded, ie branch was within range
asm_thumb_b_n(emit->as, label_num);
} else if (op_str[0] == 'b' && op_len == 3) {
uint cc = -1;
for (uint i = 0; i < (sizeof cc_name_table) / (sizeof cc_name_table[0]); 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);
// TODO check that this succeeded, ie branch was within range
asm_thumb_bcc_n(emit->as, cc, label_num);
} else {
goto unknown_op;
}
} else if (n_args == 2) {
if (strcmp(op_str, "mov") == 0) {
uint rlo_dest = get_arg_rlo(op_str, pn_args, 0);
uint rlo_src = get_arg_rlo(op_str, pn_args, 1);
asm_thumb_mov_reg_reg(emit->as, rlo_dest, rlo_src);
} else if (strcmp(op_str, "movs") == 0) {
uint rlo_dest = get_arg_rlo(op_str, pn_args, 0);
int i_src = get_arg_i(op_str, pn_args, 1, 0xff);
asm_thumb_movs_rlo_i8(emit->as, rlo_dest, i_src);
} else if (strcmp(op_str, "movw") == 0) {
uint rlo_dest = get_arg_rlo(op_str, pn_args, 0); // TODO can be reg lo or hi
int i_src = get_arg_i(op_str, pn_args, 1, 0xffff);
asm_thumb_movw_reg_i16(emit->as, rlo_dest, i_src);
} else if (strcmp(op_str, "movt") == 0) {
uint rlo_dest = get_arg_rlo(op_str, pn_args, 0); // TODO can be reg lo or hi
int i_src = get_arg_i(op_str, pn_args, 1, 0xffff);
asm_thumb_movt_reg_i16(emit->as, rlo_dest, i_src);
} else if (strcmp(op_str, "cmp") == 0) {
uint rlo = get_arg_rlo(op_str, pn_args, 0);
int i8 = get_arg_i(op_str, pn_args, 1, 0xff);
asm_thumb_cmp_rlo_i8(emit->as, rlo, i8);
} else {
goto unknown_op;
}
} else if (n_args == 3) {
if (strcmp(op_str, "add") == 0) {
uint rlo_dest = get_arg_rlo(op_str, pn_args, 0);
uint rlo_src_a = get_arg_rlo(op_str, pn_args, 1);
uint rlo_src_b = get_arg_rlo(op_str, pn_args, 2);
asm_thumb_add_reg_reg_reg(emit->as, rlo_dest, rlo_src_a, rlo_src_b);
} else if (strcmp(op_str, "subs") == 0) {
uint rlo_dest = get_arg_rlo(op_str, pn_args, 0);
uint rlo_src = get_arg_rlo(op_str, pn_args, 1);
int i3_src = get_arg_i(op_str, pn_args, 2, 0x7);
asm_thumb_subs_rlo_rlo_i3(emit->as, rlo_dest, rlo_src, i3_src);
} else {
goto unknown_op;
}
} else {
goto unknown_op;
}
return;
unknown_op:
printf("SyntaxError: unsupported ARM Thumb instruction '%s' with %d arguments\n", op_str, n_args);
}
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_op,
};
#endif // MICROPY_EMIT_INLINE_THUMB
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