From 465cba0c00bfc5d89bf10ce353b0adf40bdc098d Mon Sep 17 00:00:00 2001
From: Jon Santmyer <jon@jonsantmyer.com>
Date: Sat, 3 Oct 2026 21:32:29 -0400
Subject: unmap message object used for syscalls

---
 sys/syscall.c | 50 +++++++++++++++++++++++++++++++++-----------------
 1 file changed, 33 insertions(+), 17 deletions(-)

(limited to 'sys/syscall.c')

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);
-- 
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