unmap message object used for syscalls

16 files changed, 182 insertions, 89 deletions

diff --git a/api/syscall.h b/api/syscall.h
index 5658ac2..a116177 100644
--- a/api/syscall.h
+++ b/api/syscall.h
@@ -156,11 +156,8 @@ struct syscall_initrd_file_read
 enum
 {
     _SYSCALL_MESSAGE_NONE = 0,
-    SYSCALL_MESSAGE_SIZE
 };
 
-#define SYSCALL_PERM_MESSAGE_SIZE (JOVE_PERM_READ)
-
 /**JOVE_OBJ_VIRTTERM syscalls.*/
 
 enum
diff --git a/arch/x86_64/hal/obj.c b/arch/x86_64/hal/obj.c
index 103b53d..75cb0c0 100644
--- a/arch/x86_64/hal/obj.c
+++ b/arch/x86_64/hal/obj.c
@@ -41,7 +41,7 @@ obj_release(jove_owned_obj_t *obj)
 void*
 obj_deref(jove_owned_obj_t *obj)
 {
-    return (void*)(((uintptr_t)obj_getvalue(obj)) | 0xFFFF800000000000ULL);
+    return (void*)(((uintptr_t)obj_getvalue(obj)) | IDENT_VIRT_BASE);
 }
 
 uint8_t
diff --git a/arch/x86_64/hal/paging.c b/arch/x86_64/hal/paging.c
index 770cdff..408b5d5 100644
--- a/arch/x86_64/hal/paging.c
+++ b/arch/x86_64/hal/paging.c
@@ -42,6 +42,11 @@ paging_pml4_switch(uintptr_t pml4)
     __asm__ volatile("movq %0, %%cr3":: "r"(pml4): "memory");
 }
 
+void pagedir_invlpg(uintptr_t vptr)
+{
+    __asm__ volatile("invlpg (%0)":: "r"(vptr));
+}
+
 static struct int_stackframe*
 s_int_handle_pf_early(struct int_stackframe *frame)
 {
@@ -101,6 +106,29 @@ s_pagedir_get_pml1(page_t *pml4, uintptr_t vptr)
     return PML_TBL(pml2, pml2i);
 }
 
+uintptr_t *pagedir_get_mapping(jove_owned_obj_t *pagedir, uintptr_t vptr)
+{
+    page_t *pml4 = obj_deref(pagedir);
+    page_t *pml1 = s_pagedir_get_pml1(pml4, vptr);
+    if(!pml1) return 0;
+
+    size_t pml1i = PML1I(vptr);
+    page_t *mapping = &pml1[pml1i];
+    return (uintptr_t*)mapping;
+}
+
+uintptr_t 
+pagedir_ident_from_mapping(uintptr_t *mapping)
+{
+    return (((page_t*)mapping)->paddr << 12) | IDENT_VIRT_BASE;
+}
+
+void 
+pagedir_mapping_set_present(uintptr_t *mapping, bool present)
+{
+    ((page_t*)mapping)->p = present;
+}
+
 int pagedir_map_frame(page_t *pml4, 
         uintptr_t pptr, uintptr_t vptr,
         uintmax_t flg)
@@ -113,7 +141,7 @@ int pagedir_map_frame(page_t *pml4,
     if(pml1[pml1i].p) return EEXIST;
 
     pml1[pml1i].value = pptr | PAGE_PRESENT | flg;
-    __asm__ volatile("invlpg (%0)":: "r"(vptr): "memory");
+    pagedir_invlpg(vptr);
     return 0;
 }
 
@@ -184,7 +212,7 @@ map_table:
         PAGE_PRESENT |
         (pptr > IDENT_VIRT_BASE ? 0 : PAGE_USER) |
         PAGE_WRITEABLE;
-    __asm__ volatile("invlpg (%0)":: "r"(vptr): "memory");
+    pagedir_invlpg(vptr);
     return 0;
 }
 
@@ -241,7 +269,7 @@ int pagedir_unmap_untyped_frame(
 
     jove_untyped_t *untyped_data = obj_deref(dst);
     untyped_data->limit = 0x1000;
-    __asm__ volatile("invlpg (%0)":: "r"(vptr): "memory");
+    pagedir_invlpg(vptr);
 
     return 0;
 }
@@ -295,7 +323,7 @@ unmap_table:
     jove_untyped_t *untyped = obj_deref(dst);
     untyped->limit = 0x1000;
 
-    __asm__ volatile("invlpg (%0)":: "r"(vptr): "memory");
+    pagedir_invlpg(vptr);
     return 0;
 }
 }
diff --git a/arch/x86_64/proc/init.c b/arch/x86_64/proc/init.c
index 4c86038..be1d556 100644
--- a/arch/x86_64/proc/init.c
+++ b/arch/x86_64/proc/init.c
@@ -144,7 +144,7 @@ init_setup(void)
     
     jove_owned_obj_t *message_obj = objdir_getlocal(_rootdir_obj, ROOTDIR_MESSAGE_I);
     obj_settype(message_obj, JOVE_OBJ_MESSAGE);
-    obj_setvalue(message_obj, (message_pptr & ~0xFFF) | 1);
+    obj_setvalue(message_obj, last_base | 1);
     obj_release(message_obj);
 
     obj_release(init_pagedir);
diff --git a/arch/x86_64/proc/process.c b/arch/x86_64/proc/process.c
index 0c5c282..6165585 100644
--- a/arch/x86_64/proc/process.c
+++ b/arch/x86_64/proc/process.c
@@ -11,55 +11,46 @@
 
 PAGEALIGN uint8_t s_init_iopb[0x2000];
 PAGEALIGN char _init_pcb_bytes[0x1000] = { 0 };
-pcb_t *_init_pcb = (pcb_t*)&_init_pcb_bytes;
-
-pid_t
-pcb_pid(pcb_t *pcb)
-{
-    return pcb->pid;
-}
-
-jove_obj_t*
-pcb_rootdir(pcb_t *pcb)
-{
-    return pcb->rootdir;
-}
+pcb_t *pcb_tree;
 
 void
 processing_setup(void (*process_main))
 {
+    pcb_t *init_pcb = (pcb_t*)&_init_pcb_bytes;
+    pcb_tree = init_pcb;
+
     memset(s_init_iopb, 0xFF, 0x2000);
     uintptr_t ksp = ((uintptr_t)&_init_pcb_bytes) + 0xFF8;
 
-    _init_pcb->tree_node.get_key = (void*)pcb_pid;
-    _init_pcb->tree_node.color = 1;
+    init_pcb->header.tree_node.get_key = (void*)pcb_getpid;
+    init_pcb->header.tree_node.color = 1;
+    init_pcb->header.rootdir = _rootdir_obj;
+    init_pcb->header.pagedir = obj_release(objdir_getlocal(_rootdir_obj, ROOTDIR_PAGEDIR_I));
 
-    _init_pcb->pid = 1;
-    _init_pcb->ksp = (void*)ksp;
-    _init_pcb->pml4 = paging_get_pml4();
-    _init_pcb->rootdir = _rootdir_obj;
+    init_pcb->header.pid = 1;
+    init_pcb->ksp = (void*)ksp;
 
     jove_owned_obj_t *iopb_obj = objdir_getlocal(_rootdir_obj, ROOTDIR_IOPB_I);
     obj_settype(iopb_obj, JOVE_OBJ_IOPB);
     obj_setvalue(iopb_obj, (uintptr_t)s_init_iopb);
-    _init_pcb->iopb = iopb_obj;
+    init_pcb->iopb = obj_release(iopb_obj);
 
     processor_t *proc = processor_current();
-    proc->tss.rsp[0] = (uintptr_t)_init_pcb->ksp;
+    proc->tss.rsp[0] = (uintptr_t)init_pcb->ksp;
     memcpy(proc->iopb, s_init_iopb, 0x2000);
 
     {
         jove_owned_obj_t *process_obj = objdir_getlocal(_rootdir_obj, ROOTDIR_PCB_I);
         obj_settype(process_obj, JOVE_OBJ_PCB);
-        obj_setvalue(process_obj, (uintptr_t)_init_pcb);
+        obj_setvalue(process_obj, (uintptr_t)init_pcb);
 
         proc->pcb_obj = process_obj;
-        proc->pcb = _init_pcb;
+        proc->pcb = init_pcb;
     }
 
     __asm__ volatile("\
             movq %0, %%rsp; \
             xorq %%rbp, %%rbp; \
             jmpq %1"::
-            "r"(_init_pcb->ksp), "r"(process_main));
+            "r"(init_pcb->ksp), "r"(process_main));
 }
diff --git a/arch/x86_64/proc/process.h b/arch/x86_64/proc/process.h
index cf4d8a8..534c8d5 100644
--- a/arch/x86_64/proc/process.h
+++ b/arch/x86_64/proc/process.h
@@ -7,13 +7,10 @@
 
 typedef struct process_control_block
 {
-    struct rbtree_node tree_node;
+    struct pcb_expected_header header;
     struct process_control_block *sched_next;
 
-    pid_t pid;
-    jove_obj_t *rootdir;
-    jove_owned_obj_t *iopb;
-    uintptr_t pml4;
+    jove_obj_t *iopb;
 
     enum pcb_state state;
     int killed;
diff --git a/arch/x86_64/sys/syscall.c b/arch/x86_64/sys/syscall.c
index e3fa81b..b584756 100644
--- a/arch/x86_64/sys/syscall.c
+++ b/arch/x86_64/sys/syscall.c
@@ -16,7 +16,7 @@ _syscall_handle_arch(syscall_context_t *ctx)
     syscall_handle_t call_handle = s_arch_handles[target_type];
     if(call_handle == NULL) {
         kprintf("syscall: Process %i tried to call syscall on object %P which doesn't support syscalls!\n",
-                    pcb_pid(obj_deref(ctx->pcb)), ctx->header->path, ctx->header->pathlen);
+                    pcb_getpid(obj_deref(ctx->pcb)), ctx->header->path, ctx->header->pathlen);
         return -EBADOBJ;
     }
 
diff --git a/doc/syscall.md b/doc/syscall.md
index 5a3d1e7..4fd55ad 100644
--- a/doc/syscall.md
+++ b/doc/syscall.md
@@ -318,10 +318,3 @@ Successful reading returns `0`.
 
 ### JOVE_OBJ_MESSAGE
 
-| Syscall              | Target Permissions |
-|----------------------|--------------------|
-| SYSCALL_MESSAGE_SIZE | JOVE_PERM_READ     |
-
-#### SYSCALL_MESSAGE_SIZE
-
-Returns the size of the message object in bytes.
diff --git a/hal/memory.h b/hal/memory.h
index 6e685d6..ab5f6ad 100644
--- a/hal/memory.h
+++ b/hal/memory.h
@@ -1,9 +1,10 @@
-#include "sys/syscall.h"
 #ifndef _JOVE_HAL_MEMORY_H
 #define _JOVE_HAL_MEMORY_H 1
 
 #include "hal/obj.h"
 #include "api/syscall.h"
+#include "sys/syscall.h"
+#include <stdbool.h>
 
 typedef struct jove_obj_untyped
 {
@@ -23,6 +24,14 @@ int untyped_split(jove_owned_obj_t *tgt, jove_owned_obj_t *dst, size_t bytes);
 int untyped_merge(jove_owned_obj_t *a, jove_owned_obj_t *b);
 int untyped_retype(jove_owned_obj_t *tgt, uint8_t newtype);
 
+void pagedir_invlpg(uintptr_t vptr);
+
+uintptr_t *pagedir_get_mapping(
+        jove_owned_obj_t *pagedir, uintptr_t vptr);
+
+uintptr_t pagedir_ident_from_mapping(uintptr_t *mapping);
+void pagedir_mapping_set_present(uintptr_t *mapping, bool present);
+
 int pagedir_map_untyped_frame(
         jove_owned_obj_t *tgt, jove_perm_obj_t *untyped_obj, 
         uintptr_t vptr, struct syscall_pagedir_flags flg);
diff --git a/proc/process.c b/proc/process.c
index 3687c8a..55737f6 100644
--- a/proc/process.c
+++ b/proc/process.c
@@ -6,3 +6,21 @@ process_current(void)
 {
     return processor_pcb(((processor_t*)processor_current()));
 }
+
+pid_t
+pcb_getpid(pcb_t *pcb)
+{
+    return ((struct pcb_expected_header*)pcb)->pid;
+}
+
+jove_obj_t*
+pcb_rootdir(pcb_t *pcb)
+{
+    return ((struct pcb_expected_header*)pcb)->rootdir;
+}
+
+jove_obj_t*
+pcb_pagedir(pcb_t *pcb)
+{
+    return ((struct pcb_expected_header*)pcb)->pagedir;
+}
diff --git a/proc/process.h b/proc/process.h
index 5099476..2757f6f 100644
--- a/proc/process.h
+++ b/proc/process.h
@@ -21,6 +21,10 @@ struct pcb_expected_header
 {
     struct rbtree_node tree_node;
     struct process_control_block *sched_next;
+
+    pid_t pid;
+    jove_obj_t *rootdir;
+    jove_obj_t *pagedir;
 };
 
 typedef struct process_control_block pcb_t;
@@ -29,10 +33,12 @@ jove_owned_obj_t *process_current(void);
 
 void pcb_new(pcb_t *pcb);
 /*Returns the process ID of the passed PCB. */
-pid_t pcb_pid(pcb_t *pcb);
+pid_t pcb_getpid(pcb_t *pcb);
 /*Returns the root kernel object directory of this PCB. */
 jove_obj_t *pcb_rootdir(pcb_t *pcb);
 
-extern pcb_t *_init_pcb;
+jove_obj_t *pcb_pagedir(pcb_t *pcb);
+
+extern pcb_t *pcb_tree;
 
 #endif
diff --git a/sys/message.c b/sys/message.c
index 7c871ce..c87487b 100644
--- a/sys/message.c
+++ b/sys/message.c
@@ -1,15 +1,54 @@
 #include "message.h"
+#include "api/error.h"
+#include "errno.h"
+#include "hal/memory.h"
 #include "hal/obj.h"
+#include "lib/printf.h"
 
-void *
-message_data(jove_owned_obj_t *obj)
+int
+message_hasmap(jove_owned_obj_t *obj)
 {
-    uintptr_t objptr = (uintptr_t)obj_deref(obj);
-    return (void*)(objptr & ~0xFFF);
+    return obj_getvalue(obj) & 1;
 }
 
-size_t 
-message_len(jove_owned_obj_t *obj)
+uintptr_t
+message_unmap(jove_owned_obj_t *obj, jove_owned_obj_t *pagedir)
 {
-    return (obj_getvalue(obj) & 0xFFF) << 12;
+    if(message_hasmap(obj) == 0) {
+        kprintf("Message %p doesn't have a map\n", obj_getvalue(obj));
+        return -ENOMAP;
+    }
+    uintptr_t vptr = obj->locked.value & ~0xFFFULL;
+    uintptr_t *mapping = pagedir_get_mapping(pagedir, vptr);
+
+    pagedir_mapping_set_present(mapping, false);
+    pagedir_invlpg(vptr);
+
+    obj_setvalue(obj, *mapping);
+    return vptr;
+}
+
+void 
+message_remap(jove_owned_obj_t *message, jove_owned_obj_t *pagedir, uintptr_t vptr)
+{
+    if(message_hasmap(message)) {
+        errno = -EHASMAP;
+        return;
+    }
+
+    uintmax_t *mapping = pagedir_get_mapping(pagedir, vptr);
+
+    *mapping = obj_getvalue(message) | 1;
+    pagedir_invlpg(vptr);
+
+    obj_setvalue(message, vptr | 1);
+}
+
+uintptr_t message_getdata(jove_owned_obj_t *message)
+{
+    if(message_hasmap(message))
+        return obj_getvalue(message) & ~0xFFFULL;
+
+    uintptr_t message_val = obj_getvalue(message);
+    return pagedir_ident_from_mapping(&message_val);
 }
diff --git a/sys/message.h b/sys/message.h
index 2ae6e03..97d0f71 100644
--- a/sys/message.h
+++ b/sys/message.h
@@ -3,11 +3,13 @@
 
 #include "hal/obj.h"
 
-#define MESSAGE_MAX_PAGES (1<<12)
-#define MESSAGE_MAX_BYTES (MESSAGE_MAX_PAGES * 0x1000)
+
 #define MESSAGE_ALIGN 0x1000
 
-void *message_data(jove_owned_obj_t *obj);
-size_t message_len(jove_owned_obj_t *obj);
+int message_hasmap(jove_owned_obj_t *message);
+uintptr_t message_unmap(jove_owned_obj_t *message, jove_owned_obj_t *pagedir);
+void message_remap(jove_owned_obj_t *message, jove_owned_obj_t *pagedir, uintptr_t vptr);
+
+uintptr_t message_getdata(jove_owned_obj_t *message);
 
 #endif
diff --git a/sys/syscall.c b/sys/syscall.c
index 1c9af45..7207708 100644
--- a/sys/syscall.c
+++ b/sys/syscall.c
@@ -1,5 +1,6 @@
 #include "sys/syscall.h"
 #include "arch/x86_64/hal/obj.h"
+#include "hal/memory.h"
 #include "hal/smp.h"
 #include "proc/process.h"
 #include "jove.h"
@@ -27,7 +28,7 @@ int
 _syscall_handle_generic(syscall_context_t *ctx)
 {
     pcb_t *pcb = obj_deref(ctx->pcb);
-    klogf("Process %i encountered stub syscall on object %P\n", pcb_pid(pcb), ctx->header->path, ctx->header->pathlen);
+    klogf("Process %i encountered stub syscall on object %P\n", pcb_getpid(pcb), ctx->header->path, ctx->header->pathlen);
     return -EBADOBJ;
 }
 
@@ -92,35 +93,38 @@ syscall_handler(uintmax_t message_path_raw, uint16_t message_pathlen)
 
     if(ctx.message.obj == NULL) {
         klogf("Process %i failed to get message %P : %s\n",
-                pcb_pid(pcb), message_path, message_pathlen, errstr(errno));
+                pcb_getpid(pcb), message_path, message_pathlen, errstr(errno));
         sysret = -errno;
         goto release_return;
     }
 
     if(obj_gettype(ctx.message.obj) != JOVE_OBJ_MESSAGE) {
         klogf("Process %i tried to call syscall with invalid object %P\n", 
-                pcb_pid(pcb), message_path, message_pathlen);
+                pcb_getpid(pcb), message_path, message_pathlen);
         sysret = -EBADOBJ;
         goto release_return;
     }
 
     if((ctx.message.permissions & JOVE_PERM_READ) == 0) {
         klogf("Process %i tried to call syscall with message object %P without read permissions\n",
-                pcb_pid(pcb), message_path, message_pathlen);
+                pcb_getpid(pcb), message_path, message_pathlen);
         sysret = -EPERM;
         goto release_return;
     }
 
-    size_t messagelen = message_len(ctx.message.obj);
-    void *messagedata = message_data(ctx.message.obj);
+    uintptr_t message_vptr = message_unmap(ctx.message.obj,
+            (jove_owned_obj_t*)pcb_pagedir(pcb));
+
+    size_t messagelen = 0x1000;
+    void *messagedata = (void*)message_getdata(ctx.message.obj);
     struct syscall_header *header = messagedata;
 
     size_t bytes_needed = sizeof(struct syscall_header) + header->pathlen * 2;
     if(bytes_needed > messagelen) {
         //Target path exceeds message length.
-        klogf("Process %i tried to call syscall with target path too big for message.\n", pcb_pid(pcb));
+        klogf("Process %i tried to call syscall with target path too big for message.\n", pcb_getpid(pcb));
         sysret = -ETOOSMALL;
-        goto release_return;
+        goto remap_return;
     }
 
     ctx.header = header;
@@ -128,17 +132,29 @@ syscall_handler(uintmax_t message_path_raw, uint16_t message_pathlen)
     ctx.payload = (void*)((uintptr_t)header + bytes_needed);
 
     ctx.target = link_try_traverse_objdir(
-            ctx.objdir, &ctx.lockstack, ctx.header->pathlen, ctx.header->path);
-
-    if(ctx.target.obj == 0) {
-        //Could not find payload target in pcb rootdir.
-        klogf("Process %i tried to call syscall with bad target path %P : %s\n", 
-                pcb_pid(pcb), header->path, header->pathlen, errstr(errno));
-        sysret = -errno;
-        goto release_return;
+        ctx.objdir, &ctx.lockstack, ctx.header->pathlen, ctx.header->path);
+
+    if(ctx.target.obj != 0) {
+        sysret = _syscall_handle_switch(&ctx);
+    }else{
+        //Check if we're trying to reference the PCB. If we are, we should set it as the target
+        //regardless of lock.
+        if(ctx.header->pathlen == 1 &&
+            objdir_peeklocal(ctx.objdir, ctx.header->path[0]).data == ctx.pcb->locked.data)
+        {
+            ctx.target = (jove_perm_obj_t) { .permissions = 0xFF, .obj = ctx.pcb };
+            sysret = _syscall_handle_switch(&ctx);
+
+        }else{
+            //Could not find payload target in pcb rootdir.
+            klogf("Process %i tried to call syscall with bad target path %P : %s\n", 
+                    pcb_getpid(pcb), header->path, header->pathlen, errstr(errno));
+            sysret = -errno;
+        }
     }
 
-    sysret = _syscall_handle_switch(&ctx);
+remap_return:
+    message_remap(ctx.message.obj, (jove_owned_obj_t*)pcb_pagedir(pcb), message_vptr);
 
 release_return:
     lockstack_popall(&ctx.lockstack);
diff --git a/sys/syscall_initrd_file.c b/sys/syscall_initrd_file.c
index 8e34488..904039d 100644
--- a/sys/syscall_initrd_file.c
+++ b/sys/syscall_initrd_file.c
@@ -8,16 +8,17 @@
 int
 s_syscall_initrd_file_name(
         jove_owned_obj_t *initrd_file,
-        jove_owned_obj_t *message)
+        jove_owned_obj_t *message,
+        void *message_data)
 {
     const char *filename = initrd_file_name(initrd_file);
     size_t filename_len = strlen(filename);
 
-    size_t bytes_left = message_len(message);
+    size_t bytes_left = 0x1000;
     size_t bytes_needed = filename_len + sizeof(struct syscall_initrd_file_name_ret);
 
     CHECK_TOOSMALL(bytes_needed, bytes_left, "Message is too small for file name.");
-    struct syscall_initrd_file_name_ret *payload = message_data(message);
+    struct syscall_initrd_file_name_ret *payload = message_data;
 
     payload->len = filename_len;
     memcpy(payload->c_str, filename, filename_len);
@@ -34,6 +35,7 @@ int
 s_syscall_initrd_file_read(
         jove_owned_obj_t *initrd_file,
         jove_owned_obj_t *message,
+        void *message_data,
         size_t bytes_left,
         void *payload_data)
 {
@@ -44,7 +46,7 @@ s_syscall_initrd_file_read(
 
     struct syscall_initrd_file_read *payload = payload_data;
     bytes_needed = payload->read_size;
-    bytes_left = message_len(message);
+    bytes_left = 0x1000;
 
     //Ensure that the message is big enough to hold the read file data.
     CHECK_TOOSMALL(bytes_needed, bytes_left,
@@ -67,8 +69,7 @@ s_syscall_initrd_file_read(
         return -ETOOBIG;
     }
     
-    void *read_data = message_data(message);
-    memcpy(read_data, file_data + payload->start_index, payload->read_size);
+    memcpy(message_data, file_data + payload->start_index, payload->read_size);
     return 0;
 }
 
@@ -79,7 +80,7 @@ _syscall_handle_initrd_file(syscall_context_t *ctx)
         case SYSCALL_INITRD_FILE_NAME:
             if(ctx->target.permissions & SYSCALL_PERM_INITRD_FILE_NAME)
                 return s_syscall_initrd_file_name(
-                        ctx->target.obj, ctx->message.obj);
+                        ctx->target.obj, ctx->message.obj, (void*)ctx->header);
             return -EPERM;
         
         case SYSCALL_INITRD_FILE_SIZE:
@@ -90,7 +91,7 @@ _syscall_handle_initrd_file(syscall_context_t *ctx)
         case SYSCALL_INITRD_FILE_READ:
             if(ctx->target.permissions & SYSCALL_PERM_INITRD_FILE_READ)
                 return s_syscall_initrd_file_read(
-                        ctx->target.obj, ctx->message.obj, ctx->bytes_left, ctx->payload);
+                        ctx->target.obj, ctx->message.obj, (void*)ctx->header, ctx->bytes_left, ctx->payload);
             return -EPERM;
         default:
             return -EBADCALL;
diff --git a/sys/syscall_message.c b/sys/syscall_message.c
index 5edf33f..6c5fb8f 100644
--- a/sys/syscall_message.c
+++ b/sys/syscall_message.c
@@ -6,10 +6,6 @@ int
 _syscall_handle_message(syscall_context_t *ctx)
 {
     switch(ctx->header->callid) {
-        case SYSCALL_OBJDIR_OBJTYPE:
-            if(ctx->target.permissions & SYSCALL_PERM_OBJDIR_OBJTYPE)
-                return message_len(ctx->message.obj);
-            return -EPERM;
         default:
             return -EBADCALL;
     }