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Handle pagefaults caused by running of the stack

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This commit is contained in:
Thomas Lovén 2018-03-07 21:17:06 +01:00
parent 28c82567a0
commit 4c4e7136cc
1 changed files with 16 additions and 1 deletions
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17
src/kernel/proc/procmm.c
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@ -34,7 +34,22 @@ registers *proc_pagefault(registers *r)
PANIC("Page fault in kernel\n");
}
PANIC("Page fault in process\n");
uint64_t fault_addr = read_cr2();
uint64_t stack = PROCESS()->stack;
if(fault_addr + PAGE_SIZE >= stack)
{
// Page fault happened just below stack. Add another page to it.
// Unless it's about to run into brk.
if(stack - PAGE_SIZE <= PROCESS()->brk)
PANIC("Stack overflow in process %d\n", PROCESS()->pid);
stack -= PAGE_SIZE;
vmm_set_page(PROCESS()->P4, stack, pmm_alloc(), PAGE_USER | PAGE_WRITE | PAGE_PRESENT);
PROCESS()->stack = stack;
return r;
}
PANIC("Page fault in process\n");
return r;
}