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// MIT License, Copyright (c) 2020 Marvin Borner
#include <errno.h>
#include <fs.h>
#include <load.h>
#include <mem.h>
#include <mm.h>
#include <str.h>
#include <print.h>
#define PROC_STACK_SIZE 0x4000
s32 bin_load(const char *path, struct proc *proc)
{
if (!path || !memory_valid(path) || !proc)
return -EFAULT;
struct stat s = { 0 };
memory_bypass_enable();
s32 stat = vfs_stat(path, &s);
memory_bypass_disable();
if (stat != 0)
return stat;
strcpy(proc->name, path);
struct page_dir *prev;
memory_backup_dir(&prev);
memory_switch_dir(proc->page_dir);
u32 size = PAGE_ALIGN_UP(s.size);
u32 data = (u32)memory_alloc(proc->page_dir, size, MEMORY_USER | MEMORY_CLEAR);
memory_bypass_enable();
s32 read = vfs_read(proc->name, (void *)data, 0, s.size);
memory_bypass_disable();
if (read <= 0) {
memory_switch_dir(prev);
return read;
}
u32 stack = (u32)memory_alloc(proc->page_dir, PROC_STACK_SIZE, MEMORY_USER | MEMORY_CLEAR);
proc->regs.ebp = stack;
proc->regs.useresp = stack;
proc->regs.eip = data;
proc->entry = data;
memory_switch_dir(prev);
return 0;
}
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