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fix task entry stack alignment

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This commit is contained in:
Stepan Usatiuk
2023-10-22 12:28:14 +02:00
parent 7b0083fa03
commit 4386d8c1cd
1 changed files with 3 additions and 2 deletions
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5
src/arch/x86/task.cpp
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@@ -181,8 +181,9 @@ struct Task *new_ktask(void (*fn)(), const char *name) {
newt->fxsave = static_cast<char *>(kmalloc(512));
strcpy(name, newt->name);
newt->frame.sp = ((((uintptr_t) newt->stack) + TASK_SS - 1) & (~0xFULL));// Ensure 16byte alignment
assert((newt->frame.sp & 0xFULL) == 0);
newt->frame.sp = ((((uintptr_t) newt->stack) + (TASK_SS - 9) - 1) & (~0xFULL)) + 8;// Ensure 16byte alignment
// It should be aligned before call, therefore on function entry it should be misaligned by 8 bytes
assert((newt->frame.sp & 0xFULL) == 8);
newt->frame.ip = (uint64_t) fn;
newt->frame.cs = GDTSEL(gdt_code);