On Sun, 2007-03-25 at 10:52 -0400, Jeff Dike wrote:
> On Sat, Mar 24, 2007 at 11:36:28PM -0400, Daniel Gryniewicz wrote:
> > Update: <asm/elf.h> isn't there either, but <sys/user.h> includes
> > user_regs_struct, so that's sufficient for this problem.
>
> Hummph, I hope that's true of every other distro that people use UML on.
Bad news: It has user_regs_struct, but not user_i387_struct or
user_fxsr_struct (at least not on x86_64).
> > The next problem is lack of <asm/page.h>. Most files failing to build
> > with it can simply have it removed. I've temporarily replaced PAGE_SIZE
> > with sysconf(_SC_PAGESIZE) for now, and we'll see how that works.
>
> Send patches.
>
> BTW, the important thing about PAGE_SIZE in the userspace side of UML
> is not that it be the same as sysconf(_SC_PAGESIZE) but that it match
> the value of PAGE_SIZE in the kernelspace side. Obviously, these
> values will all be the same everywhere that we care about now, but I
> can think of one or two situations where it would matter. On an
> architecture with a variable page size, the UML kernel can have a
> PAGE_SIZE of 64K but the host's sysconf can report a page size of 4K.
> In this case, it's important that PAGE_SIZE in UML userspace code be
> 64K.
>
> So, there's UM_KERN_PAGE_SIZE in kern_constants.h which is derived
> from the kernel's PAGE_SIZE and is usable in userspace files. Use
> that instead of sysconf().
Thanks for the pointer. Here's a patch I've used to test. There are
two problems with it. First, as mentioned above, I couldn't find two
user structs anywhere in the gentoo headers. It's possibly we could
convince the maintainers to add those back, since they're for gdb. I'm
not sure, tho, so I just defined them inline for now.
Second, PAGE_MASK and PAGE_SHIFT. These should be generated like
UM_KERN_PAGE_SIZE above, but I wasn't able to find where they're
generated (sorry, not up on my Kconfig magic...).
That said, the patch *does* work here on my x86_64 box, both in native
and on SUBARCH=i386 modes. I don't have any more exotic arches than
that to test on.
Daniel
diff --exclude-from=/home/dang/bin/scripts/diffrc -up -ruN linux-2.6.20.orig/arch/um/include/sysdep-i386/stub.h linux-2.6.20/arch/um/include/sysdep-i386/stub.h
--- linux-2.6.20.orig/arch/um/include/sysdep-i386/stub.h 2007-02-04 13:44:54.000000000 -0500
+++ linux-2.6.20/arch/um/include/sysdep-i386/stub.h 2007-03-26 16:11:39.000000000 -0400
@@ -9,7 +9,6 @@
#include <sys/mman.h>
#include <asm/ptrace.h>
#include <asm/unistd.h>
-#include <asm/page.h>
#include "stub-data.h"
#include "kern_constants.h"
#include "uml-config.h"
diff --exclude-from=/home/dang/bin/scripts/diffrc -up -ruN linux-2.6.20.orig/arch/um/kernel/skas/clone.c linux-2.6.20/arch/um/kernel/skas/clone.c
--- linux-2.6.20.orig/arch/um/kernel/skas/clone.c 2007-02-04 13:44:54.000000000 -0500
+++ linux-2.6.20/arch/um/kernel/skas/clone.c 2007-03-26 14:56:27.000000000 -0400
@@ -3,7 +3,6 @@
#include <sys/mman.h>
#include <sys/time.h>
#include <asm/unistd.h>
-#include <asm/page.h>
#include "ptrace_user.h"
#include "skas.h"
#include "stub-data.h"
diff --exclude-from=/home/dang/bin/scripts/diffrc -up -ruN linux-2.6.20.orig/arch/um/os-Linux/main.c linux-2.6.20/arch/um/os-Linux/main.c
--- linux-2.6.20.orig/arch/um/os-Linux/main.c 2007-02-04 13:44:54.000000000 -0500
+++ linux-2.6.20/arch/um/os-Linux/main.c 2007-03-26 14:56:59.000000000 -0400
@@ -12,7 +12,6 @@
#include <sys/resource.h>
#include <sys/mman.h>
#include <sys/user.h>
-#include <asm/page.h>
#include "user_util.h"
#include "kern_util.h"
#include "mem_user.h"
diff --exclude-from=/home/dang/bin/scripts/diffrc -up -ruN linux-2.6.20.orig/arch/um/os-Linux/skas/mem.c linux-2.6.20/arch/um/os-Linux/skas/mem.c
--- linux-2.6.20.orig/arch/um/os-Linux/skas/mem.c 2007-02-04 13:44:54.000000000 -0500
+++ linux-2.6.20/arch/um/os-Linux/skas/mem.c 2007-03-26 16:13:41.000000000 -0400
@@ -8,7 +8,6 @@
#include <string.h>
#include <sys/mman.h>
#include <sys/wait.h>
-#include <asm/page.h>
#include <asm/unistd.h>
#include "mem_user.h"
#include "mem.h"
@@ -109,6 +108,8 @@ static inline long do_syscall_stub(struc
return ret;
}
+#define PAGE_MASK (~(UM_KERN_PAGE_SIZE-1))
+#define PAGE_SHIFT 12
long run_syscall_stub(struct mm_id * mm_idp, int syscall,
unsigned long *args, long expected, void **addr,
int done)
@@ -133,7 +134,7 @@ long run_syscall_stub(struct mm_id * mm_
multi_op_count++;
if(!done && ((((unsigned long) stack) & ~PAGE_MASK) <
- PAGE_SIZE - 10 * sizeof(long))){
+ UM_KERN_PAGE_SIZE - 10 * sizeof(long))){
*addr = stack;
return 0;
}
@@ -152,7 +153,7 @@ long syscall_stub_data(struct mm_id * mm
* Thus in this case do_syscall_stub correctly won't be called.
*/
if((((unsigned long) *addr) & ~PAGE_MASK) >=
- PAGE_SIZE - (10 + data_count) * sizeof(long)) {
+ UM_KERN_PAGE_SIZE - (10 + data_count) * sizeof(long)) {
ret = do_syscall_stub(mm_idp, addr);
/* in case of error, don't overwrite data on stack */
if(ret)
diff --exclude-from=/home/dang/bin/scripts/diffrc -up -ruN linux-2.6.20.orig/arch/um/os-Linux/start_up.c linux-2.6.20/arch/um/os-Linux/start_up.c
--- linux-2.6.20.orig/arch/um/os-Linux/start_up.c 2007-02-04 13:44:54.000000000 -0500
+++ linux-2.6.20/arch/um/os-Linux/start_up.c 2007-03-26 14:57:45.000000000 -0400
@@ -18,7 +18,6 @@
#include <sys/wait.h>
#include <sys/mman.h>
#include <asm/unistd.h>
-#include <asm/page.h>
#include <sys/types.h>
#include "user_util.h"
#include "kern_util.h"
@@ -79,11 +78,11 @@ static int start_ptraced_child(void **st
unsigned long sp;
int pid, n, status;
- stack = mmap(NULL, PAGE_SIZE, PROT_READ | PROT_WRITE | PROT_EXEC,
+ stack = mmap(NULL, UM_KERN_PAGE_SIZE, PROT_READ | PROT_WRITE | PROT_EXEC,
MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
if(stack == MAP_FAILED)
panic("check_ptrace : mmap failed, errno = %d", errno);
- sp = (unsigned long) stack + PAGE_SIZE - sizeof(void *);
+ sp = (unsigned long) stack + UM_KERN_PAGE_SIZE - sizeof(void *);
pid = clone(ptrace_child, (void *) sp, SIGCHLD, NULL);
if(pid < 0)
panic("start_ptraced_child : clone failed, errno = %d", errno);
@@ -128,7 +127,7 @@ static int stop_ptraced_child(int pid, v
ret = -1;
}
- if(munmap(stack, PAGE_SIZE) < 0)
+ if(munmap(stack, UM_KERN_PAGE_SIZE) < 0)
panic("check_ptrace : munmap failed, errno = %d", errno);
return ret;
}
diff --exclude-from=/home/dang/bin/scripts/diffrc -up -ruN linux-2.6.20.orig/arch/um/sys-i386/ptrace_user.c linux-2.6.20/arch/um/sys-i386/ptrace_user.c
--- linux-2.6.20.orig/arch/um/sys-i386/ptrace_user.c 2007-02-04 13:44:54.000000000 -0500
+++ linux-2.6.20/arch/um/sys-i386/ptrace_user.c 2007-03-26 16:14:34.000000000 -0400
@@ -7,9 +7,8 @@
#include <stddef.h>
#include <errno.h>
#include <unistd.h>
+#include <sys/user.h>
#include "ptrace_user.h"
-/* Grr, asm/user.h includes asm/ptrace.h, so has to follow ptrace_user.h */
-#include <asm/user.h>
#include "kern_util.h"
#include "sysdep/thread.h"
#include "user.h"
diff --exclude-from=/home/dang/bin/scripts/diffrc -up -ruN linux-2.6.20.orig/arch/um/sys-i386/user-offsets.c linux-2.6.20/arch/um/sys-i386/user-offsets.c
--- linux-2.6.20.orig/arch/um/sys-i386/user-offsets.c 2007-02-04 13:44:54.000000000 -0500
+++ linux-2.6.20/arch/um/sys-i386/user-offsets.c 2007-03-26 16:10:51.000000000 -0400
@@ -1,7 +1,7 @@
#include <stdio.h>
#include <signal.h>
#include <asm/ptrace.h>
-#include <asm/user.h>
+#include <sys/user.h>
#include <stddef.h>
#include <sys/poll.h>
@@ -14,6 +14,34 @@
#define OFFSET(sym, str, mem) \
DEFINE(sym, offsetof(struct str, mem));
+/* These are gone from userspace; not sure where to pull them from */
+struct user_i387_struct {
+ long cwd;
+ long swd;
+ long twd;
+ long fip;
+ long fcs;
+ long foo;
+ long fos;
+ long st_space[20]; /* 8*10 bytes for each FP-reg = 80 bytes */
+};
+
+struct user_fxsr_struct {
+ unsigned short cwd;
+ unsigned short swd;
+ unsigned short twd;
+ unsigned short fop;
+ long fip;
+ long fcs;
+ long foo;
+ long fos;
+ long mxcsr;
+ long reserved;
+ long st_space[32]; /* 8*16 bytes for each FP-reg = 128 bytes */
+ long xmm_space[32]; /* 8*16 bytes for each XMM-reg = 128 bytes */
+ long padding[56];
+};
+
void foo(void)
{
OFFSET(HOST_SC_IP, sigcontext, eip);
diff --exclude-from=/home/dang/bin/scripts/diffrc -up -ruN linux-2.6.20.orig/arch/um/sys-x86_64/user-offsets.c linux-2.6.20/arch/um/sys-x86_64/user-offsets.c
--- linux-2.6.20.orig/arch/um/sys-x86_64/user-offsets.c 2007-02-04 13:44:54.000000000 -0500
+++ linux-2.6.20/arch/um/sys-x86_64/user-offsets.c 2007-03-26 14:55:27.000000000 -0400
@@ -12,7 +12,7 @@
*/
typedef __u64 u64;
typedef __u32 u32;
-#include <asm/user.h>
+#include <sys/user.h>
#define DEFINE(sym, val) \
asm volatile("\n->" #sym " %0 " #val : : "i" (val))
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