UML - More page fault path trimming

Index: linux-2.6.21-mm/arch/um/include/os.h
===================================================================
@@ -300,13 +300,12 @@ extern long syscall_stub_data(struct mm_
 			      unsigned long *data, int data_count,
 			      void **addr, void **stub_addr);
 extern int map(struct mm_id * mm_idp, unsigned long virt,
-	       unsigned long len, int r, int w, int x, int phys_fd,
+	       unsigned long len, int prot, int phys_fd,
 	       unsigned long long offset, int done, void **data);
 extern int unmap(struct mm_id * mm_idp, unsigned long addr, unsigned long len,
 		 int done, void **data);
 extern int protect(struct mm_id * mm_idp, unsigned long addr,
-		   unsigned long len, int r, int w, int x, int done,
-		   void **data);
+		   unsigned long len, unsigned int prot, int done, void **data);
 
 /* skas/process.c */
 extern int is_skas_winch(int pid, int fd, void *data);

@@ -342,7 +341,6 @@ extern void maybe_sigio_broken(int fd, i
 
 /* skas/trap */
 extern void sig_handler_common_skas(int sig, void *sc_ptr);
-extern void user_signal(int sig, union uml_pt_regs *regs, int pid);
 
 /* sys-x86_64/prctl.c */
 extern int os_arch_prctl(int pid, int code, unsigned long *addr);

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Index: linux-2.6.21-mm/arch/um/os-Linux/skas/trap.c
===================================================================
@@ -64,20 +64,3 @@ void sig_handler_common_skas(int sig, vo
 	errno = save_errno;
 	r->skas.is_user = save_user;
 }
-
-extern int ptrace_faultinfo;
-
-void user_signal(int sig, union uml_pt_regs *regs, int pid)
-{
-	void (*handler)(int, union uml_pt_regs *);
-	int segv = ((sig == SIGFPE) || (sig == SIGSEGV) || (sig == SIGBUS) ||
-		    (sig == SIGILL) || (sig == SIGTRAP));
-
-	if (segv)
-		get_skas_faultinfo(pid, &regs->skas.faultinfo);
-
-	handler = sig_info[sig];
-	handler(sig, (union uml_pt_regs *) regs);
-
-	unblock_signals();
-}

Index: linux-2.6.21-mm/include/asm-um/page.h
===================================================================
@@ -114,9 +114,6 @@ extern unsigned long uml_physmem;
 extern struct page *arch_validate(struct page *page, gfp_t mask, int order);
 #define HAVE_ARCH_VALIDATE
 
-extern void arch_free_page(struct page *page, int order);
-#define HAVE_ARCH_FREE_PAGE
-
 #include <asm-generic/memory_model.h>
 #include <asm-generic/page.h>
 

Index: linux-2.6.21-mm/arch/um/include/tlb.h
===================================================================
@@ -14,9 +14,7 @@ struct host_vm_op {
 		struct {
 			unsigned long addr;
 			unsigned long len;
-			unsigned int r:1;
-			unsigned int w:1;
-			unsigned int x:1;
+			unsigned int prot;
 			int fd;
 			__u64 offset;
 		} mmap;

@@ -27,9 +25,7 @@ struct host_vm_op {
 		struct {
 			unsigned long addr;
 			unsigned long len;
-			unsigned int r:1;
-			unsigned int w:1;
-			unsigned int x:1;
+			unsigned int prot;
 		} mprotect;
 	} u;
 };

Index: linux-2.6.21-mm/arch/um/kernel/skas/tlb.c
===================================================================
@@ -27,9 +27,9 @@ static int do_ops(union mm_context *mmu,
 		switch(op->type){
 		case MMAP:
 			ret = map(&mmu->skas.id, op->u.mmap.addr,
-				  op->u.mmap.len, op->u.mmap.r, op->u.mmap.w,
-				  op->u.mmap.x, op->u.mmap.fd,
-				  op->u.mmap.offset, finished, flush);
+				  op->u.mmap.len, op->u.mmap.prot,
+				  op->u.mmap.fd, op->u.mmap.offset, finished,
+				  flush);
 			break;
 		case MUNMAP:
 			ret = unmap(&mmu->skas.id, op->u.munmap.addr,

@@ -37,8 +37,7 @@ static int do_ops(union mm_context *mmu,
 			break;
 		case MPROTECT:
 			ret = protect(&mmu->skas.id, op->u.mprotect.addr,
-				      op->u.mprotect.len, op->u.mprotect.r,
-				      op->u.mprotect.w, op->u.mprotect.x,
+				      op->u.mprotect.len, op->u.mprotect.prot,
 				      finished, flush);
 			break;
 		default:

@@ -102,10 +101,10 @@ void flush_tlb_page_skas(struct vm_area_
 	pte_t *pte;
 	struct mm_struct *mm = vma->vm_mm;
 	void *flush = NULL;
-	int r, w, x, err = 0;
+	int r, w, x, prot, err = 0;
 	struct mm_id *mm_id;
 
-	pgd = pgd_offset(vma->vm_mm, address);
+	pgd = pgd_offset(mm, address);
 	if(!pgd_present(*pgd))
 		goto kill;
 

@@ -130,19 +129,21 @@ void flush_tlb_page_skas(struct vm_area_
 	}
 
 	mm_id = &mm->context.skas.id;
+	prot = ((r ? UM_PROT_READ : 0) | (w ? UM_PROT_WRITE : 0) |
+		(x ? UM_PROT_EXEC : 0));
 	if(pte_newpage(*pte)){
 		if(pte_present(*pte)){
 			unsigned long long offset;
 			int fd;
 
 			fd = phys_mapping(pte_val(*pte) & PAGE_MASK, &offset);
-			err = map(mm_id, address, PAGE_SIZE, r, w, x, fd,
-				  offset, 1, &flush);
+			err = map(mm_id, address, PAGE_SIZE, prot, fd, offset,
+				  1, &flush);
 		}
 		else err = unmap(mm_id, address, PAGE_SIZE, 1, &flush);
 	}
 	else if(pte_newprot(*pte))
-		err = protect(mm_id, address, PAGE_SIZE, r, w, x, 1, &flush);
+		err = protect(mm_id, address, PAGE_SIZE, prot, 1, &flush);
 
 	if(err)
 		goto kill;

103 lines not on this page · raw message

Index: linux-2.6.21-mm/arch/um/sys-i386/user-offsets.c
===================================================================
@@ -1,9 +1,10 @@
 #include <stdio.h>
+#include <stddef.h>
 #include <signal.h>
+#include <sys/poll.h>
+#include <sys/mman.h>
 #include <asm/ptrace.h>
 #include <asm/user.h>
-#include <stddef.h>
-#include <sys/poll.h>
 
 #define DEFINE(sym, val) \
 	asm volatile("\n->" #sym " %0 " #val : : "i" (val))

@@ -72,4 +73,8 @@ void foo(void)
 	DEFINE(UM_POLLIN, POLLIN);
 	DEFINE(UM_POLLPRI, POLLPRI);
 	DEFINE(UM_POLLOUT, POLLOUT);
+
+	DEFINE(UM_PROT_READ, PROT_READ);
+	DEFINE(UM_PROT_WRITE, PROT_WRITE);
+	DEFINE(UM_PROT_EXEC, PROT_EXEC);
 }

Index: linux-2.6.21-mm/include/asm-um/tlbflush.h
===================================================================
@@ -7,6 +7,7 @@
 #define __UM_TLBFLUSH_H
 
 #include <linux/mm.h>
+#include "choose-mode.h"
 
 /*
  * TLB flushing:

@@ -24,6 +25,18 @@ extern void flush_tlb_all(void);
 extern void flush_tlb_mm(struct mm_struct *mm);
 extern void flush_tlb_range(struct vm_area_struct *vma, unsigned long start, 
 			    unsigned long end);
+extern void flush_tlb_page_skas(struct vm_area_struct *vma,
+				unsigned long address);
+
+static inline void flush_tlb_page(struct vm_area_struct *vma,
+				  unsigned long address)
+{
+	address &= PAGE_MASK;
+
+	CHOOSE_MODE(flush_tlb_range(vma, address, address + PAGE_SIZE),
+		    flush_tlb_page_skas(vma, address));
+}
+
 extern void flush_tlb_page(struct vm_area_struct *vma, unsigned long vmaddr);
 extern void flush_tlb_kernel_vm(void);
 extern void flush_tlb_kernel_range(unsigned long start, unsigned long end);

@@ -35,14 +48,3 @@ static inline void flush_tlb_pgtables(st
 }
 
 #endif
-
-/*
- * Overrides for Emacs so that we follow Linus's tabbing style.
- * Emacs will notice this stuff at the end of the file and automatically
- * adjust the settings for this buffer only.  This must remain at the end
- * of the file.
- * ---------------------------------------------------------------------------
- * Local variables:
- * c-file-style: "linux"
- * End:
- */

Index: linux-2.6.21-mm/arch/um/sys-x86_64/user-offsets.c
===================================================================
@@ -2,6 +2,7 @@
 #include <stddef.h>
 #include <signal.h>
 #include <sys/poll.h>
+#include <sys/mman.h>
 #define __FRAME_OFFSETS
 #include <asm/ptrace.h>
 #include <asm/types.h>

@@ -93,4 +94,8 @@ void foo(void)
 	DEFINE(UM_POLLIN, POLLIN);
 	DEFINE(UM_POLLPRI, POLLPRI);
 	DEFINE(UM_POLLOUT, POLLOUT);
+
+	DEFINE(UM_PROT_READ, PROT_READ);
+	DEFINE(UM_PROT_WRITE, PROT_WRITE);
+	DEFINE(UM_PROT_EXEC, PROT_EXEC);
 }