From: Alan Cox <alan@linux.intel.com>
Date: Wed, 19 Oct 2016 19:46:00 +0000 (+0100)
Subject: 68000: for 32bit platforms we need a codebase field
X-Git-Url: https://git.ndcode.org/public/gitweb.cgi?a=commitdiff_plain;h=41afb190e6108545668b6bb8608a70bcdf8a44a7;p=FUZIX.git

68000: for 32bit platforms we need a codebase field
---

diff --git a/Kernel/include/kernel.h b/Kernel/include/kernel.h
index 76c2632a..cb3c64cc 100644
--- a/Kernel/include/kernel.h
+++ b/Kernel/include/kernel.h
@@ -402,6 +402,11 @@ typedef struct p_tab {
 #endif
 } p_tab, *ptptr;
 
+/*
+ *	We copy the u_data block between processes when we fork and on some
+ *	platforms it moves. This means that there must be *no* internal pointer
+ *	references to the udata within u_data itself.
+ */
 typedef struct u_data {
     /**** If you change this top section, also update offsets in "kernel.def" ****/
     struct p_tab *u_ptab;       /* Process table pointer */
@@ -422,6 +427,9 @@ typedef struct u_data {
     void *      u_isp;          /* Value of initial sp (argv) */
     usize_t	u_top;		/* Top of memory for this task */
     uaddr_t	u_break;	/* Top of data space */
+#ifdef CONFIG_32BIT
+    uaddr_t	u_codebase;	/* 32bit platform base pointers */
+#endif
     int     (*u_sigvec[NSIGS])(int);   /* Array of signal vectors */
     /**** If you change this top section, also update offsets in "kernel.def" ****/
 
diff --git a/Kernel/kernel-68000.def b/Kernel/kernel-68000.def
index f3c00c19..b22e4e20 100644
--- a/Kernel/kernel-68000.def
+++ b/Kernel/kernel-68000.def
@@ -16,7 +16,8 @@
 #define U_DATA__U_ARGN2		34
 #define U_DATA__U_ARGN3		38
 #define U_DATA__U_ISP		42
-#define U_DATA__U_SIGVEC	46
+#define U_DATA__U_CODEBASE	46
+#define U_DATA__U_SIGVEC	50
 
 #define P_TAB__P_STATUS_OFFSET	0
 #define P_TAB__P_TTY_OFFSET	1