kopia lustrzana https://github.com/micropython/micropython
467 wiersze
16 KiB
C
467 wiersze
16 KiB
C
#include <stdint.h>
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#include <stdio.h>
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#include <assert.h>
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#include <string.h>
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#include "misc.h"
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#include "mpyconfig.h"
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#include "asmthumb.h"
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#define UNSIGNED_FIT8(x) (((x) & 0xffffff00) == 0)
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#define UNSIGNED_FIT16(x) (((x) & 0xffff0000) == 0)
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#define SIGNED_FIT8(x) (((x) & 0xffffff80) == 0) || (((x) & 0xffffff80) == 0xffffff80)
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#define SIGNED_FIT9(x) (((x) & 0xffffff00) == 0) || (((x) & 0xffffff00) == 0xffffff00)
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#define SIGNED_FIT12(x) (((x) & 0xfffff800) == 0) || (((x) & 0xfffff800) == 0xfffff800)
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struct _asm_thumb_t {
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int pass;
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uint code_offset;
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uint code_size;
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byte *code_base;
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byte dummy_data[8];
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int max_num_labels;
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int *label_offsets;
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int num_locals;
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uint push_reglist;
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uint stack_adjust;
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};
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asm_thumb_t *asm_thumb_new(uint max_num_labels) {
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asm_thumb_t *as;
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as = m_new(asm_thumb_t, 1);
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as->pass = 0;
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as->code_offset = 0;
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as->code_size = 0;
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as->code_base = NULL;
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as->max_num_labels = max_num_labels;
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as->label_offsets = m_new(int, max_num_labels);
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as->num_locals = 0;
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return as;
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}
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void asm_thumb_free(asm_thumb_t *as, bool free_code) {
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if (free_code) {
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m_free(as->code_base);
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}
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/*
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if (as->label != NULL) {
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int i;
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for (i = 0; i < as->label->len; ++i)
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{
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Label *lab = &g_array_index(as->label, Label, i);
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if (lab->unresolved != NULL)
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g_array_free(lab->unresolved, true);
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}
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g_array_free(as->label, true);
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}
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*/
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m_free(as);
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}
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void asm_thumb_start_pass(asm_thumb_t *as, int pass) {
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as->pass = pass;
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as->code_offset = 0;
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if (pass == ASM_THUMB_PASS_2) {
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memset(as->label_offsets, -1, as->max_num_labels * sizeof(int));
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}
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}
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void asm_thumb_end_pass(asm_thumb_t *as) {
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if (as->pass == ASM_THUMB_PASS_2) {
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// calculate size of code in bytes
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as->code_size = as->code_offset;
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as->code_base = m_new(byte, as->code_size);
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printf("code_size: %u\n", as->code_size);
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}
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/*
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// check labels are resolved
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if (as->label != NULL)
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{
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int i;
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for (i = 0; i < as->label->len; ++i)
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if (g_array_index(as->label, Label, i).unresolved != NULL)
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return false;
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}
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*/
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}
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// all functions must go through this one to emit bytes
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static byte *asm_thumb_get_cur_to_write_bytes(asm_thumb_t *as, int num_bytes_to_write) {
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//printf("emit %d\n", num_bytes_to_write);
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if (as->pass < ASM_THUMB_PASS_3) {
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as->code_offset += num_bytes_to_write;
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return as->dummy_data;
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} else {
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assert(as->code_offset + num_bytes_to_write <= as->code_size);
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byte *c = as->code_base + as->code_offset;
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as->code_offset += num_bytes_to_write;
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return c;
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}
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}
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uint asm_thumb_get_code_size(asm_thumb_t *as) {
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return as->code_size;
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}
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void *asm_thumb_get_code(asm_thumb_t *as) {
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// need to set low bit to indicate that it's thumb code
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return (void *)(((machine_uint_t)as->code_base) | 1);
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}
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/*
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static void asm_thumb_write_byte_1(asm_thumb_t *as, byte b1) {
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byte *c = asm_thumb_get_cur_to_write_bytes(as, 1);
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c[0] = b1;
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}
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*/
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static void asm_thumb_write_op16(asm_thumb_t *as, uint op) {
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byte *c = asm_thumb_get_cur_to_write_bytes(as, 2);
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// little endian
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c[0] = op;
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c[1] = op >> 8;
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}
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static void asm_thumb_write_op32(asm_thumb_t *as, uint op1, uint op2) {
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byte *c = asm_thumb_get_cur_to_write_bytes(as, 4);
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// little endian, op1 then op2
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c[0] = op1;
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c[1] = op1 >> 8;
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c[2] = op2;
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c[3] = op2 >> 8;
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}
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/*
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#define IMM32_L0(x) ((x) & 0xff)
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#define IMM32_L1(x) (((x) >> 8) & 0xff)
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#define IMM32_L2(x) (((x) >> 16) & 0xff)
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#define IMM32_L3(x) (((x) >> 24) & 0xff)
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static void asm_thumb_write_word32(asm_thumb_t *as, int w32) {
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byte *c = asm_thumb_get_cur_to_write_bytes(as, 4);
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c[0] = IMM32_L0(w32);
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c[1] = IMM32_L1(w32);
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c[2] = IMM32_L2(w32);
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c[3] = IMM32_L3(w32);
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}
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*/
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// rlolist is a bit map indicating desired lo-registers
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#define OP_PUSH_RLIST(rlolist) (0xb400 | (rlolist))
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#define OP_PUSH_RLIST_LR(rlolist) (0xb400 | 0x0100 | (rlolist))
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#define OP_POP_RLIST(rlolist) (0xbc00 | (rlolist))
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#define OP_POP_RLIST_PC(rlolist) (0xbc00 | 0x0100 | (rlolist))
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#define OP_ADD_SP(num_words) (0xb000 | (num_words))
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#define OP_SUB_SP(num_words) (0xb080 | (num_words))
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void asm_thumb_entry(asm_thumb_t *as, int num_locals) {
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// work out what to push and how many extra space to reserve on stack
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// so that we have enough for all locals and it's aligned an 8-byte boundary
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uint reglist;
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uint stack_adjust;
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if (num_locals < 0) {
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num_locals = 0;
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}
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// don't ppop r0 because it's used for return value
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switch (num_locals) {
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case 0:
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reglist = 0xf2;
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stack_adjust = 0;
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break;
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case 1:
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reglist = 0xf2;
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stack_adjust = 0;
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break;
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case 2:
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reglist = 0xfe;
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stack_adjust = 0;
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break;
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case 3:
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reglist = 0xfe;
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stack_adjust = 0;
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break;
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default:
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reglist = 0xfe;
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stack_adjust = ((num_locals - 3) + 1) & (~1);
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break;
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}
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asm_thumb_write_op16(as, OP_PUSH_RLIST_LR(reglist));
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if (stack_adjust > 0) {
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asm_thumb_write_op16(as, OP_SUB_SP(stack_adjust));
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}
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as->push_reglist = reglist;
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as->stack_adjust = stack_adjust;
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as->num_locals = num_locals;
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}
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void asm_thumb_exit(asm_thumb_t *as) {
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if (as->stack_adjust > 0) {
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asm_thumb_write_op16(as, OP_ADD_SP(as->stack_adjust));
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}
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asm_thumb_write_op16(as, OP_POP_RLIST_PC(as->push_reglist));
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}
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void asm_thumb_label_assign(asm_thumb_t *as, int label) {
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assert(label < as->max_num_labels);
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if (as->pass == ASM_THUMB_PASS_2) {
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// assign label offset
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assert(as->label_offsets[label] == -1);
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as->label_offsets[label] = as->code_offset;
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} else if (as->pass == ASM_THUMB_PASS_3) {
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// ensure label offset has not changed from PASS_2 to PASS_3
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//printf("l%d: (at %d=%ld)\n", label, as->label_offsets[label], as->code_offset);
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assert(as->label_offsets[label] == as->code_offset);
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}
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}
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static int get_label_dest(asm_thumb_t *as, int label) {
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assert(label < as->max_num_labels);
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return as->label_offsets[label];
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}
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#define OP_MOVS_RLO_I8(rlo_dest, i8_src) (0x2000 | ((rlo_dest) << 8) | (i8_src))
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// the i8_src value will be zero extended into the r32 register!
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void asm_thumb_movs_rlo_i8(asm_thumb_t *as, uint rlo_dest, int i8_src) {
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assert(rlo_dest < REG_R8);
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// movs rlo_dest, #i8_src
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asm_thumb_write_op16(as, OP_MOVS_RLO_I8(rlo_dest, i8_src));
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}
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#define OP_MOVW (0xf240)
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#define OP_MOVT (0xf2c0)
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// if loading lo half with movw, the i16 value will be zero extended into the r32 register!
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static void asm_thumb_mov_reg_i16(asm_thumb_t *as, uint mov_op, uint reg_dest, int i16_src) {
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assert(reg_dest < REG_R15);
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// mov[wt] reg_dest, #i16_src
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asm_thumb_write_op32(as, mov_op | ((i16_src >> 1) & 0x0400) | ((i16_src >> 12) & 0xf), ((i16_src << 4) & 0x7000) | (reg_dest << 8) | (i16_src & 0xff));
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}
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// the i16_src value will be zero extended into the r32 register!
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void asm_thumb_movw_reg_i16(asm_thumb_t *as, uint reg_dest, int i16_src) {
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asm_thumb_mov_reg_i16(as, OP_MOVW, reg_dest, i16_src);
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}
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// the i16_src value will be zero extended into the r32 register!
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void asm_thumb_movt_reg_i16(asm_thumb_t *as, uint reg_dest, int i16_src) {
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asm_thumb_mov_reg_i16(as, OP_MOVT, reg_dest, i16_src);
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}
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void asm_thumb_mov_reg_reg(asm_thumb_t *as, uint reg_dest, uint reg_src) {
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uint op_lo;
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if (reg_src < 8) {
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op_lo = reg_src << 3;
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} else {
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op_lo = 0x40 | ((reg_src - 8) << 3);
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}
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if (reg_dest < 8) {
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op_lo |= reg_dest;
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} else {
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op_lo |= 0x80 | (reg_dest - 8);
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}
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// mov reg_dest, reg_src
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asm_thumb_write_op16(as, 0x4600 | op_lo);
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}
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#define OP_SUBS_RLO_RLO_I3(rlo_dest, rlo_src, i3_src) (0x1e00 | ((i3_src) << 6) | ((rlo_src) << 3) | (rlo_dest))
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void asm_thumb_subs_rlo_rlo_i3(asm_thumb_t *as, uint rlo_dest, uint rlo_src, int i3_src) {
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assert(rlo_dest < REG_R8);
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assert(rlo_src < REG_R8);
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asm_thumb_write_op16(as, OP_SUBS_RLO_RLO_I3(rlo_dest, rlo_src, i3_src));
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}
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#define OP_CMP_RLO_I8(rlo, i8) (0x2800 | ((rlo) << 8) | (i8))
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void asm_thumb_cmp_rlo_i8(asm_thumb_t *as, uint rlo, int i8) {
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assert(rlo < REG_R8);
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asm_thumb_write_op16(as, OP_CMP_RLO_I8(rlo, i8));
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}
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#define OP_B_N(byte_offset) (0xe000 | (((byte_offset) >> 1) & 0x07ff))
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void asm_thumb_b_n(asm_thumb_t *as, int label) {
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int dest = get_label_dest(as, label);
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int rel = dest - as->code_offset;
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rel -= 4; // account for instruction prefetch, PC is 4 bytes ahead of this instruction
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if (SIGNED_FIT12(rel)) {
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asm_thumb_write_op16(as, OP_B_N(rel));
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} else {
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printf("asm_thumb_b_n: branch does not fit in 12 bits\n");
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}
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}
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#define OP_BEQ_N(byte_offset) (0xd000 | (((byte_offset) >> 1) & 0x00ff))
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#define OP_BNE_N(byte_offset) (0xd100 | (((byte_offset) >> 1) & 0x00ff))
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#define OP_BCS_N(byte_offset) (0xd200 | (((byte_offset) >> 1) & 0x00ff))
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#define OP_BCC_N(byte_offset) (0xd300 | (((byte_offset) >> 1) & 0x00ff))
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#define OP_BMI_N(byte_offset) (0xd400 | (((byte_offset) >> 1) & 0x00ff))
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#define OP_BPL_N(byte_offset) (0xd500 | (((byte_offset) >> 1) & 0x00ff))
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#define OP_BVS_N(byte_offset) (0xd600 | (((byte_offset) >> 1) & 0x00ff))
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#define OP_BVC_N(byte_offset) (0xd700 | (((byte_offset) >> 1) & 0x00ff))
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#define OP_BHI_N(byte_offset) (0xd800 | (((byte_offset) >> 1) & 0x00ff))
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#define OP_BLS_N(byte_offset) (0xd900 | (((byte_offset) >> 1) & 0x00ff))
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#define OP_BGE_N(byte_offset) (0xda00 | (((byte_offset) >> 1) & 0x00ff))
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#define OP_BLT_N(byte_offset) (0xdb00 | (((byte_offset) >> 1) & 0x00ff))
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#define OP_BGT_N(byte_offset) (0xdc00 | (((byte_offset) >> 1) & 0x00ff))
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#define OP_BLE_N(byte_offset) (0xdd00 | (((byte_offset) >> 1) & 0x00ff))
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void asm_thumb_bgt_n(asm_thumb_t *as, int label) {
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int dest = get_label_dest(as, label);
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int rel = dest - as->code_offset;
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rel -= 4; // account for instruction prefetch, PC is 4 bytes ahead of this instruction
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if (SIGNED_FIT9(rel)) {
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asm_thumb_write_op16(as, OP_BGT_N(rel));
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} else {
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printf("asm_thumb_bgt: branch does not fit in 9 bits\n");
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}
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}
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void asm_thumb_mov_reg_i32(asm_thumb_t *as, uint reg_dest, machine_uint_t i32) {
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// movw, movt does it in 8 bytes
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// ldr [pc, #], dw does it in 6 bytes, but we might not reach to end of code for dw
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asm_thumb_mov_reg_i16(as, OP_MOVW, reg_dest, i32);
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asm_thumb_mov_reg_i16(as, OP_MOVT, reg_dest, i32 >> 16);
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}
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void asm_thumb_mov_reg_i32_optimised(asm_thumb_t *as, uint reg_dest, int i32) {
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if (reg_dest < 8 && UNSIGNED_FIT8(i32)) {
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asm_thumb_movs_rlo_i8(as, reg_dest, i32);
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} else if (UNSIGNED_FIT16(i32)) {
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asm_thumb_mov_reg_i16(as, OP_MOVW, reg_dest, i32);
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} else {
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asm_thumb_mov_reg_i32(as, reg_dest, i32);
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}
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}
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#define OP_STR_TO_SP_OFFSET(rlo_dest, word_offset) (0x9000 | ((rlo_dest) << 8) | ((word_offset) & 0x00ff))
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#define OP_LDR_FROM_SP_OFFSET(rlo_dest, word_offset) (0x9800 | ((rlo_dest) << 8) | ((word_offset) & 0x00ff))
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void asm_thumb_mov_local_reg(asm_thumb_t *as, int local_num, uint rlo_src) {
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assert(rlo_src < REG_R8);
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int word_offset = as->num_locals - local_num - 1;
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assert(as->pass < ASM_THUMB_PASS_3 || word_offset >= 0);
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asm_thumb_write_op16(as, OP_STR_TO_SP_OFFSET(rlo_src, word_offset));
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}
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void asm_thumb_mov_reg_local(asm_thumb_t *as, uint rlo_dest, int local_num) {
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assert(rlo_dest < REG_R8);
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int word_offset = as->num_locals - local_num - 1;
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assert(as->pass < ASM_THUMB_PASS_3 || word_offset >= 0);
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asm_thumb_write_op16(as, OP_LDR_FROM_SP_OFFSET(rlo_dest, word_offset));
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}
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void asm_thumb_mov_reg_local_addr(asm_thumb_t *as, uint reg_dest, int local_num) {
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assert(0);
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// see format 12, load address
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asm_thumb_write_op16(as, 0x0000);
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}
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#define OP_ADD_REG_REG_REG(rlo_dest, rlo_src_a, rlo_src_b) (0x1800 | ((rlo_src_b) << 6) | ((rlo_src_a) << 3) | (rlo_dest))
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void asm_thumb_add_reg_reg_reg(asm_thumb_t *as, uint rlo_dest, uint rlo_src_a, uint rlo_src_b) {
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asm_thumb_write_op16(as, OP_ADD_REG_REG_REG(rlo_dest, rlo_src_a, rlo_src_b));
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}
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#define OP_CMP_REG_REG(rlo_a, rlo_b) (0x4280 | ((rlo_b) << 3) | (rlo_a))
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void asm_thumb_cmp_reg_reg(asm_thumb_t *as, uint rlo_a, uint rlo_b) {
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asm_thumb_write_op16(as, OP_CMP_REG_REG(rlo_a, rlo_b));
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}
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void asm_thumb_ite_ge(asm_thumb_t *as) {
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asm_thumb_write_op16(as, 0xbfac);
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}
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// this could be wrong, because it should have a range of +/- 16MiB...
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#define OP_BW_HI(byte_offset) (0xf000 | (((byte_offset) >> 12) & 0x07ff))
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#define OP_BW_LO(byte_offset) (0xb800 | (((byte_offset) >> 1) & 0x07ff))
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void asm_thumb_b_label(asm_thumb_t *as, int label) {
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int dest = get_label_dest(as, label);
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int rel = dest - as->code_offset;
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rel -= 4; // account for instruction prefetch, PC is 4 bytes ahead of this instruction
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if (dest >= 0 && rel <= -4) {
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// is a backwards jump, so we know the size of the jump on the first pass
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// calculate rel assuming 12 bit relative jump
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if (SIGNED_FIT12(rel)) {
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asm_thumb_write_op16(as, OP_B_N(rel));
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} else {
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goto large_jump;
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}
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} else {
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// is a forwards jump, so need to assume it's large
|
|
large_jump:
|
|
asm_thumb_write_op32(as, OP_BW_HI(rel), OP_BW_LO(rel));
|
|
}
|
|
}
|
|
|
|
// all these bit arithmetics need coverage testing!
|
|
#define OP_BEQ(byte_offset) (0xd000 | (((byte_offset) >> 1) & 0x00ff))
|
|
#define OP_BEQW_HI(byte_offset) (0xf000 | (((byte_offset) >> 10) & 0x0400) | (((byte_offset) >> 14) & 0x003f))
|
|
#define OP_BEQW_LO(byte_offset) (0x8000 | ((byte_offset) & 0x2000) | (((byte_offset) >> 1) & 0x0fff))
|
|
|
|
void asm_thumb_cmp_reg_bz_label(asm_thumb_t *as, uint rlo, int label) {
|
|
assert(rlo < REG_R8);
|
|
|
|
// compare reg with 0
|
|
asm_thumb_write_op16(as, OP_CMP_RLO_I8(rlo, 0));
|
|
|
|
// branch if equal
|
|
int dest = get_label_dest(as, label);
|
|
int rel = dest - as->code_offset;
|
|
rel -= 4; // account for instruction prefetch, PC is 4 bytes ahead of this instruction
|
|
if (dest >= 0 && rel <= -4) {
|
|
// is a backwards jump, so we know the size of the jump on the first pass
|
|
// calculate rel assuming 9 bit relative jump
|
|
if (SIGNED_FIT9(rel)) {
|
|
asm_thumb_write_op16(as, OP_BEQ(rel));
|
|
} else {
|
|
goto large_jump;
|
|
}
|
|
} else {
|
|
// is a forwards jump, so need to assume it's large
|
|
large_jump:
|
|
asm_thumb_write_op32(as, OP_BEQW_HI(rel), OP_BEQW_LO(rel));
|
|
}
|
|
}
|
|
|
|
#define OP_BLX(reg) (0x4780 | ((reg) << 3))
|
|
#define OP_SVC(arg) (0xdf00 | (arg))
|
|
#define OP_LDR_FROM_BASE_OFFSET(rlo_dest, rlo_base, word_offset) (0x6800 | (((word_offset) << 6) & 0x07c0) | ((rlo_base) << 3) | (rlo_dest))
|
|
|
|
void asm_thumb_bl_ind(asm_thumb_t *as, void *fun_ptr, uint fun_id, uint reg_temp) {
|
|
/* TODO make this use less bytes
|
|
uint rlo_base = REG_R3;
|
|
uint rlo_dest = REG_R7;
|
|
uint word_offset = 4;
|
|
asm_thumb_write_op16(as, 0x0000);
|
|
asm_thumb_write_op16(as, 0x6800 | (word_offset << 6) | (rlo_base << 3) | rlo_dest); // ldr rlo_dest, [rlo_base, #offset]
|
|
asm_thumb_write_op16(as, 0x4780 | (REG_R9 << 3)); // blx reg
|
|
*/
|
|
|
|
if (0) {
|
|
// load ptr to function into register using immediate, then branch
|
|
// not relocatable
|
|
asm_thumb_mov_reg_i32(as, reg_temp, (machine_uint_t)fun_ptr);
|
|
asm_thumb_write_op16(as, OP_BLX(reg_temp));
|
|
} else if (1) {
|
|
asm_thumb_write_op16(as, OP_LDR_FROM_BASE_OFFSET(reg_temp, REG_R7, fun_id));
|
|
asm_thumb_write_op16(as, OP_BLX(reg_temp));
|
|
} else {
|
|
// use SVC
|
|
asm_thumb_write_op16(as, OP_SVC(fun_id));
|
|
}
|
|
}
|