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Date: Thu, 23 Aug 2007 17:38:07 -0400
From: Jeff Dike <jdike@...toit.com>
To: Andrew Morton <akpm@...l.org>
Cc: LKML <linux-kernel@...r.kernel.org>,
uml-devel <user-mode-linux-devel@...ts.sourceforge.net>
Subject: [PATCH 3/7] UML - ptrace floating point fixes
Handle floating point state better in ptrace. The code now correctly
distinguishes between PTRACE_[GS]ETFPREGS and PTRACE_[GS]ETFPXREGS.
The FPX requests get handed off to arch-specific code because that's
not generic.
get_fpregs, set_fpregs, set_fpregs, and set_fpxregs needed real
implementations.
Something here exposed a missing include in asm/page.h, which needed
linux/types.h in order to get gfp_t, so that's fixed here.
Signed-off-by: Jeff Dike <jdike@...ux.intel.com>
--
arch/um/kernel/ptrace.c | 18 +++------
arch/um/sys-i386/ptrace.c | 73 ++++++++++++++++++++++++++--------------
arch/um/sys-x86_64/ptrace.c | 53 +++++++++++++++++++++--------
include/asm-um/page.h | 1
include/asm-um/ptrace-generic.h | 11 +++---
include/asm-um/ptrace-i386.h | 6 +++
6 files changed, 107 insertions(+), 55 deletions(-)
Index: linux-2.6.22/arch/um/kernel/ptrace.c
===================================================================
--- linux-2.6.22.orig/arch/um/kernel/ptrace.c 2007-08-23 12:56:16.000000000 -0400
+++ linux-2.6.22/arch/um/kernel/ptrace.c 2007-08-23 12:56:44.000000000 -0400
@@ -143,22 +143,14 @@ long arch_ptrace(struct task_struct *chi
#endif
#ifdef PTRACE_GETFPREGS
case PTRACE_GETFPREGS: /* Get the child FPU state. */
- ret = get_fpregs(data, child);
+ ret = get_fpregs((struct user_i387_struct __user *) data,
+ child);
break;
#endif
#ifdef PTRACE_SETFPREGS
case PTRACE_SETFPREGS: /* Set the child FPU state. */
- ret = set_fpregs(data, child);
- break;
-#endif
-#ifdef PTRACE_GETFPXREGS
- case PTRACE_GETFPXREGS: /* Get the child FPU state. */
- ret = get_fpxregs(data, child);
- break;
-#endif
-#ifdef PTRACE_SETFPXREGS
- case PTRACE_SETFPXREGS: /* Set the child FPU state. */
- ret = set_fpxregs(data, child);
+ ret = set_fpregs((struct user_i387_struct __user *) data,
+ child);
break;
#endif
case PTRACE_GET_THREAD_AREA:
@@ -227,6 +219,8 @@ long arch_ptrace(struct task_struct *chi
#endif
default:
ret = ptrace_request(child, request, addr, data);
+ if (ret == -EIO)
+ ret = subarch_ptrace(child, request, addr, data);
break;
}
Index: linux-2.6.22/arch/um/sys-x86_64/ptrace.c
===================================================================
--- linux-2.6.22.orig/arch/um/sys-x86_64/ptrace.c 2007-08-23 12:56:16.000000000 -0400
+++ linux-2.6.22/arch/um/sys-x86_64/ptrace.c 2007-08-23 12:56:44.000000000 -0400
@@ -156,28 +156,53 @@ int is_syscall(unsigned long addr)
return(instr == 0x050f);
}
-int get_fpregs(unsigned long buf, struct task_struct *child)
+int get_fpregs(struct user_i387_struct __user *buf, struct task_struct *child)
{
- panic("get_fpregs");
- return(0);
-}
+ int err, n, cpu = ((struct thread_info *) child->stack)->cpu;
+ long fpregs[HOST_FP_SIZE];
-int set_fpregs(unsigned long buf, struct task_struct *child)
-{
- panic("set_fpregs");
- return(0);
+ BUG_ON(sizeof(*buf) != sizeof(fpregs));
+ err = save_fp_registers(userspace_pid[cpu], fpregs);
+ if (err)
+ return err;
+
+ n = copy_to_user((void *) buf, fpregs, sizeof(fpregs));
+ if(n > 0)
+ return -EFAULT;
+
+ return n;
}
-int get_fpxregs(unsigned long buf, struct task_struct *tsk)
+int set_fpregs(struct user_i387_struct __user *buf, struct task_struct *child)
{
- panic("get_fpxregs");
- return(0);
+ int n, cpu = ((struct thread_info *) child->stack)->cpu;
+ long fpregs[HOST_FP_SIZE];
+
+ BUG_ON(sizeof(*buf) != sizeof(fpregs));
+ n = copy_from_user(fpregs, (void *) buf, sizeof(fpregs));
+ if (n > 0)
+ return -EFAULT;
+
+ return restore_fp_registers(userspace_pid[cpu], fpregs);
}
-int set_fpxregs(unsigned long buf, struct task_struct *tsk)
+long subarch_ptrace(struct task_struct *child, long request, long addr,
+ long data)
{
- panic("set_fxpregs");
- return(0);
+ int ret = -EIO;
+
+ switch (request) {
+ case PTRACE_GETFPXREGS: /* Get the child FPU state. */
+ ret = get_fpregs((struct user_i387_struct __user *) data,
+ child);
+ break;
+ case PTRACE_SETFPXREGS: /* Set the child FPU state. */
+ ret = set_fpregs((struct user_i387_struct __user *) data,
+ child);
+ break;
+ }
+
+ return ret;
}
/*
Index: linux-2.6.22/include/asm-um/ptrace-generic.h
===================================================================
--- linux-2.6.22.orig/include/asm-um/ptrace-generic.h 2007-08-23 12:56:16.000000000 -0400
+++ linux-2.6.22/include/asm-um/ptrace-generic.h 2007-08-23 12:56:44.000000000 -0400
@@ -9,6 +9,7 @@
#ifndef __ASSEMBLY__
#include "asm/arch/ptrace-abi.h"
+#include <asm/user.h>
#include "sysdep/ptrace.h"
struct pt_regs {
@@ -35,12 +36,14 @@ struct pt_regs {
struct task_struct;
+extern long subarch_ptrace(struct task_struct *child, long request, long addr,
+ long data);
extern unsigned long getreg(struct task_struct *child, int regno);
extern int putreg(struct task_struct *child, int regno, unsigned long value);
-extern int get_fpregs(unsigned long buf, struct task_struct *child);
-extern int set_fpregs(unsigned long buf, struct task_struct *child);
-extern int get_fpxregs(unsigned long buf, struct task_struct *child);
-extern int set_fpxregs(unsigned long buf, struct task_struct *tsk);
+extern int get_fpregs(struct user_i387_struct __user *buf,
+ struct task_struct *child);
+extern int set_fpregs(struct user_i387_struct __user *buf,
+ struct task_struct *child);
extern void show_regs(struct pt_regs *regs);
Index: linux-2.6.22/include/asm-um/ptrace-i386.h
===================================================================
--- linux-2.6.22.orig/include/asm-um/ptrace-i386.h 2007-08-23 12:56:16.000000000 -0400
+++ linux-2.6.22/include/asm-um/ptrace-i386.h 2007-08-23 12:56:44.000000000 -0400
@@ -10,6 +10,7 @@
#include "linux/compiler.h"
#include "asm/ptrace-generic.h"
+#include <asm/user.h>
#include "sysdep/ptrace.h"
#define PT_REGS_EAX(r) UPT_EAX(&(r)->regs)
@@ -45,6 +46,11 @@
*/
struct user_desc;
+extern int get_fpxregs(struct user_fxsr_struct __user *buf,
+ struct task_struct *child);
+extern int set_fpxregs(struct user_fxsr_struct __user *buf,
+ struct task_struct *tsk);
+
extern int ptrace_get_thread_area(struct task_struct *child, int idx,
struct user_desc __user *user_desc);
Index: linux-2.6.22/arch/um/sys-i386/ptrace.c
===================================================================
--- linux-2.6.22.orig/arch/um/sys-i386/ptrace.c 2007-08-23 12:56:24.000000000 -0400
+++ linux-2.6.22/arch/um/sys-i386/ptrace.c 2007-08-23 12:56:50.000000000 -0400
@@ -6,6 +6,7 @@
#include "linux/mm.h"
#include "linux/sched.h"
#include "asm/uaccess.h"
+#include "skas.h"
extern int arch_switch_tls(struct task_struct *from, struct task_struct *to);
@@ -144,48 +145,64 @@ int peek_user(struct task_struct *child,
return put_user(tmp, (unsigned long __user *) data);
}
-static inline int convert_fxsr_to_user(struct _fpstate __user *buf,
- struct pt_regs *regs)
+int get_fpregs(struct user_i387_struct __user *buf, struct task_struct *child)
{
- return 0;
-}
+ int err, n, cpu = ((struct thread_info *) child->stack)->cpu;
+ long fpregs[HOST_FP_SIZE];
-static inline int convert_fxsr_from_user(struct pt_regs *regs,
- struct _fpstate __user *buf)
-{
- return 0;
+ BUG_ON(sizeof(*buf) != sizeof(fpregs));
+ err = save_fp_registers(userspace_pid[cpu], fpregs);
+ if (err)
+ return err;
+
+ n = copy_to_user((void *) buf, fpregs, sizeof(fpregs));
+ if(n > 0)
+ return -EFAULT;
+
+ return n;
}
-int get_fpregs(unsigned long buf, struct task_struct *child)
+int set_fpregs(struct user_i387_struct __user *buf, struct task_struct *child)
{
- int err;
+ int n, cpu = ((struct thread_info *) child->stack)->cpu;
+ long fpregs[HOST_FP_SIZE];
- err = convert_fxsr_to_user((struct _fpstate __user *) buf,
- &child->thread.regs);
- if (err)
+ BUG_ON(sizeof(*buf) != sizeof(fpregs));
+ n = copy_from_user(fpregs, (void *) buf, sizeof(fpregs));
+ if (n > 0)
return -EFAULT;
- return 0;
+
+ return restore_fp_registers(userspace_pid[cpu], fpregs);
}
-int set_fpregs(unsigned long buf, struct task_struct *child)
+int get_fpxregs(struct user_fxsr_struct __user *buf, struct task_struct *child)
{
- int err;
+ int err, n, cpu = ((struct thread_info *) child->stack)->cpu;
+ long fpregs[HOST_XFP_SIZE];
- err = convert_fxsr_from_user(&child->thread.regs,
- (struct _fpstate __user *) buf);
+ BUG_ON(sizeof(*buf) != sizeof(fpregs));
+ err = save_fpx_registers(userspace_pid[cpu], fpregs);
if (err)
+ return err;
+
+ n = copy_to_user((void *) buf, fpregs, sizeof(fpregs));
+ if(n > 0)
return -EFAULT;
- return 0;
-}
-int get_fpxregs(unsigned long buf, struct task_struct *tsk)
-{
- return 0;
+ return n;
}
-int set_fpxregs(unsigned long buf, struct task_struct *tsk)
+int set_fpxregs(struct user_fxsr_struct __user *buf, struct task_struct *child)
{
- return 0;
+ int n, cpu = ((struct thread_info *) child->stack)->cpu;
+ long fpregs[HOST_XFP_SIZE];
+
+ BUG_ON(sizeof(*buf) != sizeof(fpregs));
+ n = copy_from_user(fpregs, (void *) buf, sizeof(fpregs));
+ if (n > 0)
+ return -EFAULT;
+
+ return restore_fpx_registers(userspace_pid[cpu], fpregs);
}
#ifdef notdef
@@ -209,3 +226,9 @@ int dump_fpu(struct pt_regs *regs, elf_f
{
return 1;
}
+
+long subarch_ptrace(struct task_struct *child, long request, long addr,
+ long data)
+{
+ return -EIO;
+}
Index: linux-2.6.22/include/asm-um/page.h
===================================================================
--- linux-2.6.22.orig/include/asm-um/page.h 2007-08-23 12:56:16.000000000 -0400
+++ linux-2.6.22/include/asm-um/page.h 2007-08-23 12:56:44.000000000 -0400
@@ -9,6 +9,7 @@
struct page;
+#include <linux/types.h>
#include <asm/vm-flags.h>
/* PAGE_SHIFT determines the page size */
-
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