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py: For inline assembler, add bcc_n and bcc_w ops. 

Addresses issue #1143.
This commit is contained in:
Damien George 2015-03-02 14:29:52 +00:00
parent 565da3f569
commit 9f142f0c84
3 changed files with 19 additions and 12 deletions
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23
py/asmthumb.c
View File

@ -307,15 +307,24 @@ bool asm_thumb_b_n_label(asm_thumb_t *as, uint label) {
#define OP_BCC_N(cond, byte_offset) (0xd000 | ((cond) << 8) | (((byte_offset) >> 1) & 0x00ff))
bool asm_thumb_bcc_n_label(asm_thumb_t *as, int cond, uint label) {
// all these bit arithmetics need coverage testing!
#define OP_BCC_W_HI(cond, byte_offset) (0xf000 | ((cond) << 6) | (((byte_offset) >> 10) & 0x0400) | (((byte_offset) >> 14) & 0x003f))
#define OP_BCC_W_LO(byte_offset) (0x8000 | ((byte_offset) & 0x2000) | (((byte_offset) >> 1) & 0x0fff))
bool asm_thumb_bcc_nw_label(asm_thumb_t *as, int cond, uint label, bool wide) {
mp_uint_t dest = get_label_dest(as, label);
mp_int_t rel = dest - as->code_offset;
rel -= 4; // account for instruction prefetch, PC is 4 bytes ahead of this instruction
if (SIGNED_FIT9(rel)) {
asm_thumb_op16(as, OP_BCC_N(cond, rel));
return true;
if (!wide) {
if (SIGNED_FIT9(rel)) {
asm_thumb_op16(as, OP_BCC_N(cond, rel));
return true;
} else {
return false;
}
} else {
return false;
asm_thumb_op32(as, OP_BCC_W_HI(cond, rel), OP_BCC_W_LO(rel));
return true;
}
}
@ -416,10 +425,6 @@ void asm_thumb_b_label(asm_thumb_t *as, uint label) {
}
}
// all these bit arithmetics need coverage testing!
#define OP_BCC_W_HI(cond, byte_offset) (0xf000 | ((cond) << 6) | (((byte_offset) >> 10) & 0x0400) | (((byte_offset) >> 14) & 0x003f))
#define OP_BCC_W_LO(byte_offset) (0x8000 | ((byte_offset) & 0x2000) | (((byte_offset) >> 1) & 0x0fff))
void asm_thumb_bcc_label(asm_thumb_t *as, int cond, uint label) {
mp_uint_t dest = get_label_dest(as, label);
mp_int_t rel = dest - as->code_offset;

2
py/asmthumb.h
View File

@ -216,7 +216,7 @@ void asm_thumb_mov_reg_i16(asm_thumb_t *as, uint mov_op, uint reg_dest, int i16_
// these return true if the destination is in range, false otherwise
bool asm_thumb_b_n_label(asm_thumb_t *as, uint label);
bool asm_thumb_bcc_n_label(asm_thumb_t *as, int cond, uint label);
bool asm_thumb_bcc_nw_label(asm_thumb_t *as, int cond, uint label, bool wide);
bool asm_thumb_bl_label(asm_thumb_t *as, uint label);
void asm_thumb_mov_reg_i32(asm_thumb_t *as, uint reg_dest, mp_uint_t i32_src); // convenience

6
py/emitinlinethumb.c
View File

@ -378,7 +378,9 @@ STATIC void emit_inline_thumb_op(emit_inline_asm_t *emit, qstr op, mp_uint_t n_a
} 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) {
} 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]) {
@ -389,7 +391,7 @@ STATIC void emit_inline_thumb_op(emit_inline_asm_t *emit, qstr op, mp_uint_t n_a
goto unknown_op;
}
int label_num = get_arg_label(emit, op_str, pn_args[0]);
if (!asm_thumb_bcc_n_label(emit->as, cc, label_num)) {
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') {