From: Ben Gras <ben@minix3.org>
Date: Thu, 5 Apr 2012 01:37:17 +0000 (+0200)
Subject: vm: full memory view
X-Git-Tag: v3.2.1~610
X-Git-Url: http://zhaoyanbai.com/repos/%22http:/www.isc.org/icons/expt.png?a=commitdiff_plain;h=b480472a761922ac3469c8f02031210d40686322;p=minix.git

vm: full memory view

for user-space processes, increase text segment so it reaches the full
address space, so code can be executed anywhere.
---

diff --git a/servers/vm/exec.c b/servers/vm/exec.c
index 3cb186b81..69b53f839 100644
--- a/servers/vm/exec.c
+++ b/servers/vm/exec.c
@@ -211,7 +211,7 @@ SANITYCHECK(SCL_DETAIL);
 	 CLICK2ABS(gap_clicks),	/* how big is gap, page-aligned */
 	 0,0,			/* not preallocated */
 	 VM_STACKTOP,		/* regular stack top */
-	 0, is_elf)) != OK) {
+	 0, is_elf, 1)) != OK) {
     SANITYCHECK(SCL_DETAIL);
     printf("VM: new_mem: failed\n");
     if(ptok) {
@@ -288,7 +288,8 @@ int proc_new(struct vmproc *vmp,
   phys_bytes data_start,  /* data starts here, if preallocated, otherwise 0 */
   phys_bytes stacktop,
   int prealloc_stack,
-  int is_elf
+  int is_elf,
+  int full_memview
 )
 {
 	int s;
@@ -311,7 +312,12 @@ int proc_new(struct vmproc *vmp,
 	map_text_addr = vstart + text_addr;
 	vmp->vm_arch.vm_seg[T].mem_phys = ABS2CLICK(map_text_addr);
 	vmp->vm_arch.vm_seg[T].mem_vir = ABS2CLICK(text_addr);
-	vmp->vm_arch.vm_seg[T].mem_len = ABS2CLICK(text_bytes);
+	if(full_memview) {
+		vmp->vm_arch.vm_seg[T].mem_len = ABS2CLICK(VM_DATATOP) -
+			vmp->vm_arch.vm_seg[T].mem_phys;
+	} else {
+		vmp->vm_arch.vm_seg[T].mem_len = ABS2CLICK(text_bytes);
+	}
 
 	vmp->vm_offset = vstart;
 
diff --git a/servers/vm/fork.c b/servers/vm/fork.c
index 9a2033406..807fba710 100644
--- a/servers/vm/fork.c
+++ b/servers/vm/fork.c
@@ -154,7 +154,7 @@ int do_fork(message *msg)
 		stack_bytes, child_gap_bytes, 0, 0,
 		CLICK2ABS(vmc->vm_arch.vm_seg[S].mem_vir +
 			  vmc->vm_arch.vm_seg[S].mem_len),
-		1, is_elf)) != OK) {
+		1, is_elf, 0)) != OK) {
 			printf("VM: fork: proc_new failed\n");
 			return r;
 	}
diff --git a/servers/vm/main.c b/servers/vm/main.c
index a0e0bd511..3f86a8194 100644
--- a/servers/vm/main.c
+++ b/servers/vm/main.c
@@ -315,7 +315,7 @@ static int sef_cb_init_fresh(int type, sef_init_info_t *info)
 				vmp->vm_arch.vm_seg[D].mem_vir) - BASICSTACK,
 			CLICK2ABS(vmp->vm_arch.vm_seg[T].mem_phys),
 			CLICK2ABS(vmp->vm_arch.vm_seg[D].mem_phys),
-			    VM_STACKTOP, 0, is_elf) != OK) {
+			    VM_STACKTOP, 0, is_elf, 0) != OK) {
 			panic("failed proc_new for boot process");
 		}
 	}
diff --git a/servers/vm/proto.h b/servers/vm/proto.h
index 14dd12feb..3e1f9d445 100644
--- a/servers/vm/proto.h
+++ b/servers/vm/proto.h
@@ -62,7 +62,7 @@ int do_exec_newmem(message *msg);
 int proc_new(struct vmproc *vmp, phys_bytes start, phys_bytes text_addr,
 	phys_bytes text_bytes, phys_bytes data_addr, phys_bytes data_bytes,
 	phys_bytes stack, phys_bytes gap, phys_bytes text_here, phys_bytes
-	data_here, vir_bytes stacktop, int prealloc_stack, int is_elf);
+	data_here, vir_bytes stacktop, int prealloc_stack, int is_elf, int full);
 phys_bytes find_kernel_top(void);
 
 /* break.c */