emitnative: Revamp ARM codegen compile after full-arg support refactors.

The code was apparently broken after 9988618e0e
"py: Implement full func arg passing for native emitter.". This attempts to
propagate those changes to ARM emitter.

py/asmarm.c

@@ -111,6 +111,10 @@ STATIC byte *asm_arm_get_cur_to_write_bytes(asm_arm_t *as, int num_bytes_to_writ
     }
 }
 
+uint asm_arm_get_code_pos(asm_arm_t *as) {
+    return as->code_offset;
+}
+
 uint asm_arm_get_code_size(asm_arm_t *as) {
     return as->code_size;
 }
@@ -245,6 +249,14 @@ void asm_arm_exit(asm_arm_t *as) {
     emit_al(as, asm_arm_op_pop(as->push_reglist | (1 << ASM_ARM_REG_PC)));
 }
 
+void asm_arm_push(asm_arm_t *as, uint reglist) {
+    emit_al(as, asm_arm_op_push(reglist));
+}
+
+void asm_arm_pop(asm_arm_t *as, uint reglist) {
+    emit_al(as, asm_arm_op_pop(reglist));
+}
+
 void asm_arm_label_assign(asm_arm_t *as, uint label) {
     assert(label < as->max_num_labels);
     if (as->pass < ASM_ARM_PASS_EMIT) {
@@ -358,9 +370,9 @@ void asm_arm_asr_reg_reg(asm_arm_t *as, uint rd, uint rs) {
     emit_al(as, 0x1a00050 | (rd << 12) | (rs << 8) | rd);
 }
 
-void asm_arm_ldr_reg_reg(asm_arm_t *as, uint rd, uint rn) {
+void asm_arm_ldr_reg_reg(asm_arm_t *as, uint rd, uint rn, uint byte_offset) {
-    // ldr rd, [rn]
+    // ldr rd, [rn, #off]
-    emit_al(as, 0x5900000 | (rn << 16) | (rd << 12));
+    emit_al(as, 0x5900000 | (rn << 16) | (rd << 12) | byte_offset);
 }
 
 void asm_arm_ldrh_reg_reg(asm_arm_t *as, uint rd, uint rn) {
@@ -373,9 +385,9 @@ void asm_arm_ldrb_reg_reg(asm_arm_t *as, uint rd, uint rn) {
     emit_al(as, 0x5d00000 | (rn << 16) | (rd << 12));
 }
 
-void asm_arm_str_reg_reg(asm_arm_t *as, uint rd, uint rm) {
+void asm_arm_str_reg_reg(asm_arm_t *as, uint rd, uint rm, uint byte_offset) {
-    // str rd, [rm]
+    // str rd, [rm, #off]
-    emit_al(as, 0x5800000 | (rm << 16) | (rd << 12));
+    emit_al(as, 0x5800000 | (rm << 16) | (rd << 12) | byte_offset);
 }
 
 void asm_arm_strh_reg_reg(asm_arm_t *as, uint rd, uint rm) {

py/asmarm.h

@@ -74,6 +74,7 @@ asm_arm_t *asm_arm_new(uint max_num_labels);
 void asm_arm_free(asm_arm_t *as, bool free_code);
 void asm_arm_start_pass(asm_arm_t *as, uint pass);
 void asm_arm_end_pass(asm_arm_t *as);
+uint asm_arm_get_code_pos(asm_arm_t *as);
 uint asm_arm_get_code_size(asm_arm_t *as);
 void *asm_arm_get_code(asm_arm_t *as);
 
@@ -108,10 +109,10 @@ void asm_arm_lsl_reg_reg(asm_arm_t *as, uint rd, uint rs);
 void asm_arm_asr_reg_reg(asm_arm_t *as, uint rd, uint rs);
 
 // memory
-void asm_arm_ldr_reg_reg(asm_arm_t *as, uint rd, uint rn);
+void asm_arm_ldr_reg_reg(asm_arm_t *as, uint rd, uint rn, uint byte_offset);
 void asm_arm_ldrh_reg_reg(asm_arm_t *as, uint rd, uint rn);
 void asm_arm_ldrb_reg_reg(asm_arm_t *as, uint rd, uint rn);
-void asm_arm_str_reg_reg(asm_arm_t *as, uint rd, uint rm);
+void asm_arm_str_reg_reg(asm_arm_t *as, uint rd, uint rm, uint byte_offset);
 void asm_arm_strh_reg_reg(asm_arm_t *as, uint rd, uint rm);
 void asm_arm_strb_reg_reg(asm_arm_t *as, uint rd, uint rm);
 // store to array
@@ -119,6 +120,10 @@ void asm_arm_str_reg_reg_reg(asm_arm_t *as, uint rd, uint rm, uint rn);
 void asm_arm_strh_reg_reg_reg(asm_arm_t *as, uint rd, uint rm, uint rn);
 void asm_arm_strb_reg_reg_reg(asm_arm_t *as, uint rd, uint rm, uint rn);
 
+// stack
+void asm_arm_push(asm_arm_t *as, uint reglist);
+void asm_arm_pop(asm_arm_t *as, uint reglist);
+
 // control flow
 void asm_arm_bcc_label(asm_arm_t *as, int cond, uint label);
 void asm_arm_b_label(asm_arm_t *as, uint label);

py/emitnative.c

@@ -399,6 +399,8 @@ STATIC byte mp_f_n_args[MP_F_NUMBER_OF] = {
 
 #include "py/asmarm.h"
 
+#define ASM_WORD_SIZE (4)
+
 #define EXPORT_FUN(name) emit_native_arm_##name
 
 #define REG_RET ASM_ARM_REG_R0
@@ -423,12 +425,16 @@ STATIC byte mp_f_n_args[MP_F_NUMBER_OF] = {
 #define ASM_NEW             asm_arm_new
 #define ASM_FREE            asm_arm_free
 #define ASM_GET_CODE        asm_arm_get_code
+#define ASM_GET_CODE_POS    asm_arm_get_code_pos
 #define ASM_GET_CODE_SIZE   asm_arm_get_code_size
 #define ASM_START_PASS      asm_arm_start_pass
 #define ASM_END_PASS        asm_arm_end_pass
 #define ASM_ENTRY           asm_arm_entry
 #define ASM_EXIT            asm_arm_exit
 
+#define ASM_ALIGN           asm_arm_align
+#define ASM_DATA            asm_arm_data
+
 #define ASM_LABEL_ASSIGN    asm_arm_label_assign
 #define ASM_JUMP            asm_arm_b_label
 #define ASM_JUMP_IF_REG_ZERO(as, reg, label) \
@@ -468,11 +474,13 @@ STATIC byte mp_f_n_args[MP_F_NUMBER_OF] = {
 #define ASM_ADD_REG_REG(as, reg_dest, reg_src) asm_arm_add_reg_reg_reg((as), (reg_dest), (reg_dest), (reg_src))
 #define ASM_SUB_REG_REG(as, reg_dest, reg_src) asm_arm_sub_reg_reg_reg((as), (reg_dest), (reg_dest), (reg_src))
 
-#define ASM_LOAD_REG_REG(as, reg_dest, reg_base) asm_arm_ldr_reg_reg((as), (reg_dest), (reg_base))
+#define ASM_LOAD_REG_REG(as, reg_dest, reg_base) asm_arm_ldr_reg_reg((as), (reg_dest), (reg_base), 0)
+#define ASM_LOAD_REG_REG_OFFSET(as, reg_dest, reg_base, word_offset) asm_arm_ldr_reg_reg((as), (reg_dest), (reg_base), 4 * (word_offset))
 #define ASM_LOAD8_REG_REG(as, reg_dest, reg_base) asm_arm_ldrb_reg_reg((as), (reg_dest), (reg_base))
 #define ASM_LOAD16_REG_REG(as, reg_dest, reg_base) asm_arm_ldrh_reg_reg((as), (reg_dest), (reg_base))
 
-#define ASM_STORE_REG_REG(as, reg_value, reg_base) asm_arm_str_reg_reg((as), (reg_value), (reg_base))
+#define ASM_STORE_REG_REG(as, reg_value, reg_base) asm_arm_str_reg_reg((as), (reg_value), (reg_base), 0)
+#define ASM_STORE_REG_REG_OFFSET(as, reg_dest, reg_base, word_offset) asm_arm_str_reg_reg((as), (reg_dest), (reg_base), 4 * (word_offset))
 #define ASM_STORE8_REG_REG(as, reg_value, reg_base) asm_arm_strb_reg_reg((as), (reg_value), (reg_base))
 #define ASM_STORE16_REG_REG(as, reg_value, reg_base) asm_arm_strh_reg_reg((as), (reg_value), (reg_base))
 
@@ -723,6 +731,8 @@ STATIC void emit_native_start_pass(emit_t *emit, pass_kind_t pass, scope_t *scop
         #else
         #if N_THUMB
         ASM_MOV_REG_REG(emit->as, ASM_THUMB_REG_R4, REG_ARG_4);
+        #elif N_ARM
+        ASM_MOV_REG_REG(emit->as, ASM_ARM_REG_R4, REG_ARG_4);
         #else
         ASM_MOV_REG_REG(emit->as, REG_ARG_5, REG_ARG_4);
         #endif
@@ -750,6 +760,10 @@ STATIC void emit_native_start_pass(emit_t *emit, pass_kind_t pass, scope_t *scop
         asm_thumb_op16(emit->as, 0xb400 | (1 << ASM_THUMB_REG_R4)); // push 5th arg
         asm_thumb_bl_ind(emit->as, mp_fun_table[MP_F_SETUP_CODE_STATE], MP_F_SETUP_CODE_STATE, ASM_THUMB_REG_R4);
         asm_thumb_op16(emit->as, 0xbc00 | (1 << REG_RET)); // pop dummy (was 5th arg)
+        #elif N_ARM
+        asm_arm_push(emit->as, 1 << ASM_ARM_REG_R4); // push 5th arg
+        asm_arm_bl_ind(emit->as, mp_fun_table[MP_F_SETUP_CODE_STATE], MP_F_SETUP_CODE_STATE, ASM_ARM_REG_R4);
+        asm_arm_pop(emit->as, 1 << REG_RET); // pop dummy (was 5th arg)
         #else
         ASM_CALL_IND(emit->as, mp_fun_table[MP_F_SETUP_CODE_STATE], MP_F_SETUP_CODE_STATE);
         #endif