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Fix user apps randomly crashing (APIC, GDT layout, syscall entry)
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Kamil Kowalczyk
2026-01-14 19:51:18 +01:00
parent 0d8f9e565f
commit d1d772cb42
23 changed files with 276 additions and 204 deletions
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5
kernel/amd64/syscall.c
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@@ -26,7 +26,7 @@ int amd64_syscall_dispatch (void* stack_ptr) {
__asm__ volatile ("sti");
int result = func (caller, regs->rdi, regs->rsi, regs->rdx, regs->r10, regs->r8, regs->r9);
int result = func (caller, regs, regs->rdi, regs->rsi, regs->rdx, regs->r10, regs->r8, regs->r9);
__asm__ volatile ("cli");
@@ -34,7 +34,8 @@ int amd64_syscall_dispatch (void* stack_ptr) {
}
void syscall_init (void) {
amd64_wrmsr (MSR_STAR, ((uint64_t)GDT_KCODE << 32) | ((uint64_t)(GDT_UCODE - 16) << 48));
amd64_wrmsr (MSR_STAR,
((uint64_t)(GDT_KCODE | 0x03) << 32) | ((uint64_t)(GDT_KDATA | 0x03) << 48));
amd64_wrmsr (MSR_LSTAR, (uint64_t)&amd64_syscall_entry);
amd64_wrmsr (MSR_SYSCALL_MASK, (1ULL << 9));
amd64_wrmsr (MSR_EFER, amd64_rdmsr (MSR_EFER) | EFER_SCE);