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Align the stack upon function entry

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This commit is contained in:
Eugen Wissner
2026-03-13 10:15:07 +01:00
parent e1971b469e
commit f8ff357045
2 changed files with 45 additions and 2 deletions
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2
boot/stage19/cl.elna
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@@ -1516,6 +1516,8 @@ begin
elna_alloc_operation_target(instruction, variable_map)
elsif instruction^.operator = ElnaRtlOperator._xor then
elna_alloc_operation_target(instruction, variable_map)
elsif instruction^.operator = ElnaRtlOperator.div then
elna_alloc_operation_target(instruction, variable_map)
elsif instruction^.operator = ElnaRtlOperator.rem then
elna_alloc_operation_target(instruction, variable_map)
elsif instruction^.operator = ElnaRtlOperator.slt then

45
boot/stage20/cl.elna
View File

@@ -1565,6 +1565,8 @@ begin
instruction := elna_alloc_binary(instructions, instruction, variable_map)
elsif instruction^.operator = ElnaRtlOperator._xor then
instruction := elna_alloc_binary(instructions, instruction, variable_map)
elsif instruction^.operator = ElnaRtlOperator.div then
instruction := elna_alloc_binary(instructions, instruction, variable_map)
elsif instruction^.operator = ElnaRtlOperator.rem then
instruction := elna_alloc_binary(instructions, instruction, variable_map)
elsif instruction^.operator = ElnaRtlOperator.slt then
@@ -1615,13 +1617,13 @@ begin
(* Write the prologue. *)
printf("\taddi sp, sp, -%i\n\tsw ra, %i(sp)\n\tsw s0, %i(sp)\n\taddi s0, sp, %i\n\0",
operand_value + 8, operand_value + 4, operand_value, operand_value + 8);
operand_value, operand_value - 4, operand_value - 8, operand_value);
fflush(nil)
elsif instruction^.operator = ElnaRtlOperator.ret then
operand_value := instruction^.operands[1].value;
(* Write the epilogue. *)
printf("\tlw ra, %i(sp)\n\tlw s0, %i(sp)\n\taddi sp, sp, %i\n\0", operand_value + 4, operand_value, operand_value + 8);
printf("\tlw ra, %i(sp)\n\tlw s0, %i(sp)\n\taddi sp, sp, %i\n\0", operand_value - 4, operand_value - 8, operand_value);
fflush(nil)
elsif instruction^.operator = ElnaRtlOperator.nop then
else
@@ -1750,6 +1752,44 @@ begin
elna_alloc_procedure(pair^.code)
end;
proc elna_fixup_instructions(instructions: ^ElnaList);
var
instruction: ^ElnaRtlInstruction;
stack_size: Word;
begin
instruction := instructions^.first;
stack_size := instruction^.operands[1].value;
(* Align the stack. *)
stack_size := stack_size + 8;
if stack_size % 16 then
stack_size := stack_size + 16
end;
stack_size := stack_size / 16;
stack_size := stack_size * 16;
instruction^.operands[1].value := stack_size;
instruction := instructions^.last;
instruction^.operands[1].value := stack_size
end;
proc elna_fixup_procedure(rtl_declaration: ^ElnaRtlProcedure);
begin
.elna_fixup_procedure_loop;
elna_fixup_instructions(@rtl_declaration^.body);
rtl_declaration := rtl_declaration^.next;
if rtl_declaration <> nil then
goto elna_fixup_procedure_loop
end
end;
proc elna_fixup_module(pair: ^ElnaInstructionModule);
begin
elna_fixup_procedure(pair^.code)
end;
proc elna_riscv_module(pair: ^ElnaInstructionModule);
var
compiler_strings_copy: Word;
@@ -4378,6 +4418,7 @@ begin
tac := elna_tac_module_declaration(parser_node);
rtl := elna_rtl_module_declaration(tac);
elna_alloc_module(rtl);
elna_fixup_module(rtl);
elna_riscv_module(rtl);
end;