63 lines
1.4 KiB
C
63 lines
1.4 KiB
C
#include "elf.h"
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#include "proc.h"
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#include "fs/fs.h"
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#include "cpu/gdt.h"
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#include "cpu/isr.h"
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#include "lib/mem.h"
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#include "lib/string.h"
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#include "console.h"
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struct context {
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// matches the behavior of swtch()
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uint32_t edi, esi, ebp, ebx;
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uint32_t eip; // return address for swtch()
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};
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struct kstack {
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uint32_t space[400];
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struct context context;
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registers_t trapframe;
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};
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struct vm {
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void *kernel_thread;
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void *user_thread;
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struct kstack *user_kstack;
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} *vm;
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void trapret();
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void swtch(void** oldstack, void* newstack);
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void run_elf(const char* name) {
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if (!vm) {
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vm = kmalloc(sizeof(struct vm));
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vm->user_kstack = kmalloc(sizeof(struct kstack));
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}
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if (read_file(name, (void*)USER_BASE, 100 << 20) <= 0) {
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printk(name);
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printk(": file not found\n");
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return;
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}
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Elf32_Ehdr *hdr = (void*)USER_BASE;
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struct kstack *u = vm->user_kstack;
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memset(u, 0, sizeof(*u));
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u->context.eip = (uint32_t)trapret;
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registers_t *tf = &u->trapframe;
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tf->eip = hdr->e_entry;
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tf->cs = (SEG_UCODE << 3) | DPL_USER;
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tf->ds = (SEG_UDATA << 3) | DPL_USER;
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tf->es = tf->ds;
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tf->fs = tf->ds;
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tf->gs = tf->ds;
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tf->ss = tf->ds;
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tf->eflags = FL_IF;
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tf->useresp = USER_STACK_BASE;
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// initialization done, now switch to the process
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swtch(&vm->kernel_thread, &u->context);
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// process has finished
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}
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