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authorJeff Dike <jdike@addtoit.com>2007-10-16 01:27:16 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-10-16 09:43:07 -0700
commite8012b584fac3a1bb70cd896612c12086d28e9ff (patch)
tree0ec406be2ad1878b601c6e97ad6216764ddae942 /arch
parenta5f6096c805e6d2fa03ee932f8c70af34cee41a0 (diff)
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@linux.intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch')
-rw-r--r--arch/um/kernel/ptrace.c18
-rw-r--r--arch/um/sys-i386/ptrace.c73
-rw-r--r--arch/um/sys-x86_64/ptrace.c53
3 files changed, 93 insertions, 51 deletions
diff --git a/arch/um/kernel/ptrace.c b/arch/um/kernel/ptrace.c
index db55a017e9b9..2511f9199417 100644
--- a/arch/um/kernel/ptrace.c
+++ b/arch/um/kernel/ptrace.c
@@ -143,22 +143,14 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data)
#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 *child, long request, long addr, long data)
#endif
default:
ret = ptrace_request(child, request, addr, data);
+ if (ret == -EIO)
+ ret = subarch_ptrace(child, request, addr, data);
break;
}
diff --git a/arch/um/sys-i386/ptrace.c b/arch/um/sys-i386/ptrace.c
index cb899dd1c6b5..659011df1e9a 100644
--- a/arch/um/sys-i386/ptrace.c
+++ b/arch/um/sys-i386/ptrace.c
@@ -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, long addr, long data)
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_fpregset_t *fpu )
{
return 1;
}
+
+long subarch_ptrace(struct task_struct *child, long request, long addr,
+ long data)
+{
+ return -EIO;
+}
diff --git a/arch/um/sys-x86_64/ptrace.c b/arch/um/sys-x86_64/ptrace.c
index 1970d78aa528..b9032992a997 100644
--- a/arch/um/sys-x86_64/ptrace.c
+++ b/arch/um/sys-x86_64/ptrace.c
@@ -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;
}
/*

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