feat: basic elf32 loader (only LOAD segment is supported)

[lunaix-os.git] / lunaix-os / kernel / process / process.c

diff --git a/lunaix-os/kernel/process/process.c b/lunaix-os/kernel/process/process.c
index e30e46120a21b4e213c4087d10f158cc7352ca99..65384d16cc7e7cabe40aaa17217494382df160b0 100644 (file)
--- a/lunaix-os/kernel/process/process.c
+++ b/lunaix-os/kernel/process/process.c
@@ -1,6 +1,7 @@
 #include <klibc/string.h>
 #include <lunaix/clock.h>
 #include <lunaix/common.h>
+#include <lunaix/mm/mmap.h>
 #include <lunaix/mm/pmm.h>
 #include <lunaix/mm/region.h>
 #include <lunaix/mm/valloc.h>
@@ -17,7 +18,7 @@ void*
 __dup_pagetable(pid_t pid, uintptr_t mount_point)
 {
     void* ptd_pp = pmm_alloc_page(pid, PP_FGPERSIST);
-    vmm_set_mapping(PD_REFERENCED, PG_MOUNT_1, ptd_pp, PG_PREM_RW, VMAP_NULL);
+    vmm_set_mapping(VMS_SELF, PG_MOUNT_1, ptd_pp, PG_PREM_RW, VMAP_NULL);
 
     x86_page_table* ptd = PG_MOUNT_1;
     x86_page_table* pptd = (x86_page_table*)(mount_point | (0x3FF << 12));
@@ -36,8 +37,7 @@ __dup_pagetable(pid_t pid, uintptr_t mount_point)
 
         // 复制L2页表
         void* pt_pp = pmm_alloc_page(pid, PP_FGPERSIST);
-        vmm_set_mapping(
-          PD_REFERENCED, PG_MOUNT_2, pt_pp, PG_PREM_RW, VMAP_NULL);
+        vmm_set_mapping(VMS_SELF, PG_MOUNT_2, pt_pp, PG_PREM_RW, VMAP_NULL);
 
         x86_page_table* ppt = (x86_page_table*)(mount_point | (i << 12));
         x86_page_table* pt = PG_MOUNT_2;
@@ -87,7 +87,7 @@ __del_pagetable(pid_t pid, uintptr_t mount_point)
 void*
 vmm_dup_vmspace(pid_t pid)
 {
-    return __dup_pagetable(pid, PD_REFERENCED);
+    return __dup_pagetable(pid, VMS_SELF);
 }
 
 __DEFINE_LXSYSCALL(pid_t, fork)
@@ -123,7 +123,7 @@ __DEFINE_LXSYSCALL2(int, setpgid, pid_t, pid, pid_t, pgid)
 
     struct proc_info* gruppenfuhrer = get_process(pgid);
 
-    if (!gruppenfuhrer || proc->pgid == proc->pid) {
+    if (!gruppenfuhrer || proc->pgid == gruppenfuhrer->pid) {
         __current->k_status = EINVAL;
         return -1;
     }
@@ -138,30 +138,34 @@ __DEFINE_LXSYSCALL2(int, setpgid, pid_t, pid, pid_t, pgid)
 void
 init_proc_user_space(struct proc_info* pcb)
 {
-    vmm_mount_pd(PD_MOUNT_1, pcb->page_table);
+    vmm_mount_pd(VMS_MOUNT_1, pcb->page_table);
 
     /*---  分配用户栈  ---*/
 
-    // 注册用户栈区域
-    region_add(
-      &pcb->mm.regions, USTACK_END, USTACK_TOP, REGION_RW | REGION_RSHARED);
-
-    // 预留地址空间，具体物理页将由Page Fault Handler按需分配。
-    for (uintptr_t i = PG_ALIGN(USTACK_END); i < USTACK_TOP; i += PG_SIZE) {
-        vmm_set_mapping(PD_MOUNT_1, i, 0, PG_ALLOW_USER | PG_WRITE, VMAP_NULL);
+    struct mm_region* mapped;
+    struct mmap_param param = { .vms_mnt = VMS_MOUNT_1,
+                                .regions = &pcb->mm.regions,
+                                .length = USTACK_SIZE,
+                                .proct = PROT_READ | PROT_WRITE,
+                                .flags = MAP_ANON | MAP_PRIVATE | MAP_FIXED,
+                                .type = REGION_TYPE_STACK };
+
+    int status = 0;
+    if ((status = mem_map(NULL, &mapped, USTACK_END, NULL, &param))) {
+        kprint_panic("fail to alloc user stack: %d", status);
     }
 
     // TODO other uspace initialization stuff
 
-    vmm_unmount_pd(PD_MOUNT_1);
+    vmm_unmount_pd(VMS_MOUNT_1);
 }
 
 void
 __mark_region(uintptr_t start_vpn, uintptr_t end_vpn, int attr)
 {
     for (size_t i = start_vpn; i <= end_vpn; i++) {
-        x86_pte_t* curproc = &PTE_MOUNTED(PD_REFERENCED, i);
-        x86_pte_t* newproc = &PTE_MOUNTED(PD_MOUNT_1, i);
+        x86_pte_t* curproc = &PTE_MOUNTED(VMS_SELF, i);
+        x86_pte_t* newproc = &PTE_MOUNTED(VMS_MOUNT_1, i);
         cpu_invplg(newproc);
 
         if ((attr & REGION_MODE_MASK) == REGION_RSHARED) {
@@ -196,15 +200,22 @@ dup_proc()
     pcb->intr_ctx = __current->intr_ctx;
     pcb->parent = __current;
 
+    memcpy(pcb->fxstate, __current->fxstate, 512);
+
+    if (__current->cwd) {
+        pcb->cwd = __current->cwd;
+        vfs_ref_dnode(pcb->cwd);
+    }
+
     __copy_fdtable(pcb);
     region_copy(&__current->mm.regions, &pcb->mm.regions);
 
-    setup_proc_mem(pcb, PD_REFERENCED);
+    setup_proc_mem(pcb, VMS_SELF);
 
     // 根据 mm_region 进一步配置页表
 
     struct mm_region *pos, *n;
-    llist_for_each(pos, n, &pcb->mm.regions.head, head)
+    llist_for_each(pos, n, &pcb->mm.regions, head)
     {
         // 如果写共享，则不作处理。
         if ((pos->attr & REGION_WSHARED)) {
@@ -216,7 +227,7 @@ dup_proc()
         __mark_region(start_vpn, end_vpn, pos->attr);
     }
 
-    vmm_unmount_pd(PD_MOUNT_1);
+    vmm_unmount_pd(VMS_MOUNT_1);
 
     // 正如同fork，返回两次。
     pcb->intr_ctx.registers.eax = 0;
@@ -235,11 +246,11 @@ setup_proc_mem(struct proc_info* proc, uintptr_t usedMnt)
     pid_t pid = proc->pid;
     void* pt_copy = __dup_pagetable(pid, usedMnt);
 
-    vmm_mount_pd(PD_MOUNT_1, pt_copy); // 将新进程的页表挂载到挂载点#2
+    vmm_mount_pd(VMS_MOUNT_1, pt_copy); // 将新进程的页表挂载到挂载点#2
 
     // copy the kernel stack
     for (size_t i = KSTACK_START >> 12; i <= KSTACK_TOP >> 12; i++) {
-        volatile x86_pte_t* ppte = &PTE_MOUNTED(PD_MOUNT_1, i);
+        volatile x86_pte_t* ppte = &PTE_MOUNTED(VMS_MOUNT_1, i);
 
         /*
             This is a fucking nightmare, the TLB caching keep the rewrite to PTE