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micropython/py/emitinlinethumb.c

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#include <stdint.h>
#include <stdio.h>
#include <string.h>
#include <stdarg.h>
#include <assert.h>
#include "misc.h"
#include "mpconfig.h"
#include "qstr.h"
#include "lexer.h"
#include "parse.h"
#include "obj.h"
#include "emitglue.h"
#include "scope.h"
#include "runtime0.h"
#include "emit.h"
#include "asmthumb.h"
#if MICROPY_EMIT_INLINE_THUMB
typedef enum {
PN_none = 0,
#define DEF_RULE(rule, comp, kind, ...) PN_##rule,
#include "grammar.h"
#undef DEF_RULE
PN_maximum_number_of,
} pn_kind_t;
struct _emit_inline_asm_t {
uint16_t pass;
uint16_t success;
scope_t *scope;
uint max_num_labels;
qstr *label_lookup;
asm_thumb_t *as;
};
void emit_inline_thumb_error(emit_inline_asm_t *emit, const char *fmt, ...) {
printf("SyntaxError: ");
emit->success = false;
va_list ap;
va_start(ap, fmt);
vprintf(fmt, ap);
va_end(ap);
}
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->success = true;
emit->scope = scope;
asm_thumb_start_pass(emit->as, pass);
asm_thumb_entry(emit->as, 0);
}
STATIC bool 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->raw_code, f, asm_thumb_get_code_size(emit->as), emit->scope->num_pos_args);
}
return emit->success;
}
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) {
emit_inline_thumb_error(emit, "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])) {
emit_inline_thumb_error(emit, "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)) {
emit_inline_thumb_error(emit, "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 void emit_inline_thumb_align(emit_inline_asm_t *emit, uint align) {
asm_thumb_align(emit->as, align);
}
STATIC void emit_inline_thumb_data(emit_inline_asm_t *emit, uint bytesize, uint 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"},
};
STATIC uint get_arg_reg(emit_inline_asm_t *emit, const char *op, mp_parse_node_t pn, uint max_reg) {
if (MP_PARSE_NODE_IS_ID(pn)) {
qstr reg_qstr = MP_PARSE_NODE_LEAF_ARG(pn);
const char *reg_str = qstr_str(reg_qstr);
for (uint i = 0; i < 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(emit, "'%s' expects at most r%d\n", op, max_reg);
return 0;
} else {
return r->reg;
}
}
}
}
emit_inline_thumb_error(emit, "'%s' expects a register\n", 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(emit, "'%s' expects an integer\n", op);
return 0;
}
int i = MP_PARSE_NODE_LEAF_SMALL_INT(pn);
if ((i & (~fit_mask)) != 0) {
emit_inline_thumb_error(emit, "'%s' integer 0x%x does not fit in mask 0x%x\n", 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(emit, "'%s' expects an address of the form [a, b]\n", 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(emit, "'%s' expects a label\n", 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 == PASS_3) {
emit_inline_thumb_error(emit, "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, "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 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 < 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]);
// TODO check that this succeeded, ie branch was within range
asm_thumb_bcc_n(emit->as, cc, label_num);
} else if (strcmp(op_str, "cpsid")) {
// TODO check pn_args[0] == i
asm_thumb_op16(emit->as, ASM_THUMB_OP_CPSID_I);
} else if (strcmp(op_str, "cpsie")) {
// TODO check pn_args[0] == i
asm_thumb_op16(emit->as, ASM_THUMB_OP_CPSIE_I);
} 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)
uint op_code;
if (strcmp(op_str, "mov") == 0) {
uint reg_dest = get_arg_reg(emit, op_str, pn_args[0], 15);
uint 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, "and") == 0) {
op_code = ASM_THUMB_FORMAT_4_AND;
uint 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);
// TODO probably uses less ROM if these ops are in a lookup table
} else if (strcmp(op_str, "and") == 0) { op_code = ASM_THUMB_FORMAT_4_AND; goto op_format_4;
} else if (strcmp(op_str, "eor") == 0) { op_code = ASM_THUMB_FORMAT_4_EOR; goto op_format_4;
} else if (strcmp(op_str, "lsl") == 0) { op_code = ASM_THUMB_FORMAT_4_LSL; goto op_format_4;
} else if (strcmp(op_str, "lsr") == 0) { op_code = ASM_THUMB_FORMAT_4_LSR; goto op_format_4;
} else if (strcmp(op_str, "asr") == 0) { op_code = ASM_THUMB_FORMAT_4_ASR; goto op_format_4;
} else if (strcmp(op_str, "adc") == 0) { op_code = ASM_THUMB_FORMAT_4_ADC; goto op_format_4;
} else if (strcmp(op_str, "sbc") == 0) { op_code = ASM_THUMB_FORMAT_4_SBC; goto op_format_4;
} else if (strcmp(op_str, "ror") == 0) { op_code = ASM_THUMB_FORMAT_4_ROR; goto op_format_4;
} else if (strcmp(op_str, "tst") == 0) { op_code = ASM_THUMB_FORMAT_4_TST; goto op_format_4;
} else if (strcmp(op_str, "neg") == 0) { op_code = ASM_THUMB_FORMAT_4_NEG; goto op_format_4;
} else if (strcmp(op_str, "cmp") == 0) { op_code = ASM_THUMB_FORMAT_4_CMP; goto op_format_4;
} else if (strcmp(op_str, "cmn") == 0) { op_code = ASM_THUMB_FORMAT_4_CMN; goto op_format_4;
} else if (strcmp(op_str, "orr") == 0) { op_code = ASM_THUMB_FORMAT_4_ORR; goto op_format_4;
} else if (strcmp(op_str, "mul") == 0) { op_code = ASM_THUMB_FORMAT_4_MUL; goto op_format_4;
} else if (strcmp(op_str, "bic") == 0) { op_code = ASM_THUMB_FORMAT_4_BIC; goto op_format_4;
} else if (strcmp(op_str, "mvn") == 0) { op_code = ASM_THUMB_FORMAT_4_MVN; goto op_format_4;
} else {
goto unknown_op;
}
} else {
// second arg is not a register
uint op_code;
if (strcmp(op_str, "mov") == 0) {
op_code = ASM_THUMB_FORMAT_3_MOV;
uint 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) {
uint 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_movw_reg_i16(emit->as, reg_dest, i_src);
} else if (strcmp(op_str, "movt") == 0) {
uint 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_movt_reg_i16(emit->as, reg_dest, i_src);
} 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
uint 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_movw_reg_i16(emit->as, reg_dest, i_src & 0xffff);
asm_thumb_movt_reg_i16(emit->as, reg_dest, (i_src >> 16) & 0x7fff);
} else if (strcmp(op_str, "ldr") == 0) {
op_code = ASM_THUMB_FORMAT_9_LDR | ASM_THUMB_FORMAT_9_WORD_TRANSFER;
uint rlo_dest, rlo_base, i5;
mp_parse_node_t pn_base, pn_offset;
op_format_9_10:
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)) {
rlo_base = get_arg_reg(emit, op_str, pn_base, 7);
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);
}
} else if (strcmp(op_str, "ldrb") == 0) {
op_code = ASM_THUMB_FORMAT_9_LDR | ASM_THUMB_FORMAT_9_BYTE_TRANSFER;
goto op_format_9_10;
} else if (strcmp(op_str, "ldrh") == 0) {
op_code = ASM_THUMB_FORMAT_10_LDRH;
goto op_format_9_10;
} else if (strcmp(op_str, "str") == 0) {
op_code = ASM_THUMB_FORMAT_9_STR | ASM_THUMB_FORMAT_9_WORD_TRANSFER;
goto op_format_9_10;
} else if (strcmp(op_str, "strb") == 0) {
op_code = ASM_THUMB_FORMAT_9_STR | ASM_THUMB_FORMAT_9_BYTE_TRANSFER;
goto op_format_9_10;
} else if (strcmp(op_str, "strh") == 0) {
op_code = ASM_THUMB_FORMAT_10_STRH;
goto op_format_9_10;
} else {
goto unknown_op;
}
}
} else if (n_args == 3) {
uint op_code;
if (strcmp(op_str, "add") == 0) {
op_code = ASM_THUMB_FORMAT_2_ADD;
uint 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, "sub") == 0) {
op_code = ASM_THUMB_FORMAT_2_SUB;
goto op_format_2;
} else {
goto unknown_op;
}
} else {
goto unknown_op;
}
return;
unknown_op:
emit_inline_thumb_error(emit, "unsupported 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_align,
emit_inline_thumb_data,
emit_inline_thumb_op,
};
#endif // MICROPY_EMIT_INLINE_THUMB
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