Aren/toaruos
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[TEMP FIX] This is a temporary attempt to fix forking.

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This commit is contained in:
Kevin Lange 2011-03-27 23:52:02 -05:00
parent 04817c0423
commit f4f780ed90
2 changed files with 17 additions and 7 deletions
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2
Makefile
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@ -30,7 +30,7 @@ install: toaruos-initrd toaruos-kernel
@${ECHO} "\r\033[34;1m -- Kernel and ramdisk installed.\033[0m"
run: toaruos-kernel toaruos-initrd
${EMU} -kernel toaruos-kernel -initrd toaruos-initrd -append vid=qemu -serial stdio -vga std
${EMU} -kernel toaruos-kernel -initrd toaruos-initrd -append vid=qemu -serial stdio -vga std -s
#################
# Documentation #

22
kernel/core/task.c
View File

@ -3,7 +3,7 @@
* vim:noexpandtab
*/
#include <system.h>
#define KERNEL_STACK_SIZE 0x1000
#define KERNEL_STACK_SIZE 0x2400
__volatile__ task_t * current_task = NULL;
__volatile__ task_t * ready_queue;
@ -79,8 +79,10 @@ copy_stack(
uintptr_t old_base_pointer;
__asm__ __volatile__ ("mov %%ebp, %0" : "=r" (old_base_pointer));
uintptr_t offset = (uintptr_t)new_stack_start - initial;
kprintf("Offset is %x\n", offset);
uintptr_t new_stack_pointer = old_stack_pointer + offset;
uintptr_t new_base_pointer = old_base_pointer + offset;
kprintf("New base pointer is %x %x\n");
memcpy((void *)new_stack_pointer, (void *)old_stack_pointer, initial - old_stack_pointer);
for (i = (uintptr_t)new_stack_start; i > (uintptr_t)new_stack_start - size; i -= 4) {
uintptr_t temp = *(uintptr_t*)i;
@ -92,7 +94,7 @@ copy_stack(
}
__asm__ __volatile__ ("mov %0, %%esp" : : "r" (new_stack_pointer));
__asm__ __volatile__ ("mov %0, %%ebp" : : "r" (new_base_pointer));
return new_stack_pointer + (initial_esp - old_stack_pointer);
return new_stack_pointer - size;
}
void
@ -136,11 +138,19 @@ fork() {
uintptr_t ebp;
__asm__ __volatile__ ("mov %%esp, %0" : "=r" (esp));
__asm__ __volatile__ ("mov %%ebp, %0" : "=r" (ebp));
uint32_t old_stack_offset = current_task->stack + KERNEL_STACK_SIZE - esp;
new_task->esp = (new_task->stack + KERNEL_STACK_SIZE) - old_stack_offset;
memcpy((void *)(new_task->esp),(void*)esp,old_stack_offset);
kprintf("%x %x %x\n", esp, current_task->stack, (current_task->stack + KERNEL_STACK_SIZE));
signed int old_stack_offset;
if (current_task->stack > new_task->stack) {
old_stack_offset = -(current_task->stack - new_task->stack);
} else {
old_stack_offset = new_task->stack - current_task->stack;
}
new_task->esp = esp + old_stack_offset;
kprintf("%x %x %x\n", new_task->esp, new_task->stack, new_task->stack + KERNEL_STACK_SIZE);
memcpy((void *)(new_task->esp),(void*)esp,current_task->stack + KERNEL_STACK_SIZE - esp);
//new_task->esp = esp;
new_task->ebp = ebp;
kprintf("Herp.\n");
new_task->ebp = ebp + old_stack_offset;
new_task->eip = eip;
__asm__ __volatile__ ("sti");
return new_task->id;