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use t3-t6

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This commit is contained in:
Yaossg 2024-11-29 10:54:07 +08:00
parent 44051c7985
commit 57837abbba
1 changed files with 20 additions and 5 deletions
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25
boot.c
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@ -521,16 +521,16 @@ const char* reg_name(int reg) {
if (reg == 25) return "s9";
if (reg == 26) return "s10";
if (reg == 27) return "s11";
// overflow begin
if (reg == 28) return "t3";
if (reg == 29) return "t4";
if (reg == 30) return "t5";
if (reg == 31) return "t6";
// overflow begin
return 0;
}
int is_overflow(int reg) {
return reg > REG_S11;
return reg > REG_T6;
}
void reset_local() {
@ -1017,7 +1017,17 @@ int parse_function_call(int id) {
for (int i = 0; i < arg; ++i) {
asm_mv(i + REG_A0, args[i]);
}
for (int i = REG_T3; i <= REG_T6; ++i) {
if (i < max_reg_id) {
asm_sd(reg_name(i), (REG_S2 - i) * 8 - 24, "fp");
}
}
printf(" call %s\n", name);
for (int i = REG_T3; i <= REG_T6; ++i) {
if (i < max_reg_id) {
asm_ld(reg_name(i), (REG_S2 - i) * 8 - 24, "fp");
}
}
int type = global_type[id];
if (type != TYPE_VOID) {
int rd = next_reg(type);
@ -1355,7 +1365,7 @@ int parse_expr() {
void parse_local_variable(int type) {
if (type == TYPE_VOID) {
eprintf("local variable of void type is not supported\n");
eprintf("variable cannot be of void type\n");
exit(1);
}
expect_token(TOKEN_ID);
@ -1556,6 +1566,10 @@ void parse_function(const char* name) {
}
arg_type = arg_type | TYPE_PTR_MASK;
}
if (arg >= 8) {
eprintf("too many arguments\n");
exit(1);
}
args[arg++] = declare_local(token_data, arg_type);
if (token_type == TOKEN_COMMA) {
// continue;
@ -1590,8 +1604,9 @@ void parse_function(const char* name) {
}
asm_j(epilog_label);
int reg_used = max_reg_id - REG_S2;
if (reg_used > 10) reg_used = 10;
if (reg_used > 14) reg_used = 14;
int frame_size = (max_local_id - 1 + reg_used + 2) * 8;
if (reg_used > 10) reg_used = 10;
if (frame_size % 16 != 0) {
frame_size = frame_size + 8;
}
@ -1623,7 +1638,7 @@ void parse_function(const char* name) {
void parse_global_variable(int id, const char* name, int type) {
if (type == TYPE_VOID) {
eprintf("global variable of void type is not supported\n");
eprintf("variable cannot be of void type\n");
exit(1);
}
printf(".data\n");