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Can pass args to child via varargs

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This commit is contained in:
Lucia Ceionia 2023-02-06 03:55:13 -06:00
parent 5729c6c893
commit 6e66cb9bbe
2 changed files with 20 additions and 9 deletions
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14
kernel.c
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@ -212,7 +212,7 @@ void PrintFileList() {
vga_text = nextLine(vga_text) + 3;
}
}
extern void create_child(uint32_t esp, uint32_t eip);
extern void create_child(uint32_t esp, uint32_t eip, uint32_t argc, ...);
void FileSelect() {
fileCount = 5;
uint16_t *vga_text = (uint16_t *)0xb8000;
@ -245,21 +245,23 @@ void FileSelect() {
if (fileHovered < 0) fileHovered = fileCount - 1;
break;
case 0x14: // t
create_child(0x3C0000, (uintptr_t)RunTests);
create_child(0x380000, (uintptr_t)RunTests, 0);
SetCursorDisabled();
DrawScreen();
reload = 1;
break;
case KEY_X:
File83ToPath((char*)entries[fileHovered].name, (char*)path);
HexViewTest(path, &vi);
//HexViewTest(path, &vi);
create_child(0x380000, (uintptr_t)HexViewTest, 2, path, &vi);
SetVideo25Lines();
SetCursorDisabled();
DrawScreen();
break;
case KEY_V:
File83ToPath((char*)entries[fileHovered].name, (char*)path);
TextViewTest(path, &vi);
//TextViewTest(path, &vi);
create_child(0x380000, (uintptr_t)TextViewTest, 2, path, &vi);
SetVideo25Lines();
SetCursorDisabled();
DrawScreen();
@ -321,10 +323,10 @@ void start() {
vga_text += printStr("Press T for tests, or any key to continue... ", vga_text);
uint8_t key = get_key();
if (key == 't' || key == 'T')
RunTests(vga_text);
DrawScreen();
create_child(0x380000, (uintptr_t)RunTests, 0);
SetVideo25Lines();
SetCursorDisabled();
DrawScreen();
FileSelect();
}

15
task.nasm
View File

@ -7,16 +7,25 @@ ret
global task_ptr
task_ptr: equ (0x310000-4)
; extern void create_child(uint32_t esp, uint32_t eip);
; TODO Is varargs too compiler dependent?
; extern void create_child(uint32_t esp, uint32_t eip, uint32_t argc, ...);
global create_child
create_child:
xchg bx,bx
mov eax, [esp] ; return address
lea ecx, [esp+4] ; return stack, minus address
call save_current_task
xchg bx,bx
mov eax, [esp+8] ; new eip
mov ecx, [esp+12] ; argc
mov esi, esp ; old esp
mov esp, [esp+4] ; new esp
lea esi, [esi+16] ; args
mov edx, ecx
neg edx
lea esp, [esp+edx*4] ; adjust for args
mov edi, esp
; copy varargs to new stack
rep movsd
push return_prev_task ; if child returns, return to prev task
push eax
ret