X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=arch%2Fi386%2Fmath-emu%2Ffpu_entry.c;h=a0f1cab20cecd82af9243ec0e33b5f7d27add1fb;hb=refs%2Fheads%2Fvserver;hp=633f954c34501c5771807c596ce8b0ba34ba9baf;hpb=9bf4aaab3e101692164d49b7ca357651eb691cb6;p=linux-2.6.git

diff --git a/arch/i386/math-emu/fpu_entry.c b/arch/i386/math-emu/fpu_entry.c
index 633f954c3..a0f1cab20 100644
--- a/arch/i386/math-emu/fpu_entry.c
+++ b/arch/i386/math-emu/fpu_entry.c
@@ -25,7 +25,6 @@
  +---------------------------------------------------------------------------*/
 
 #include <linux/signal.h>
-#include <linux/ptrace.h>
 
 #include <asm/uaccess.h>
 #include <asm/desc.h>
@@ -155,10 +154,10 @@ asmlinkage void math_emulate(long arg)
   RE_ENTRANT_CHECK_ON;
 #endif /* RE_ENTRANT_CHECKING */
 
-  if (!current->used_math)
+  if (!used_math())
     {
       finit();
-      current->used_math = 1;
+      set_used_math();
     }
 
   SETUP_DATA_AREA(arg);
@@ -211,9 +210,8 @@ asmlinkage void math_emulate(long arg)
       if ( code_limit < code_base ) code_limit = 0xffffffff;
     }
 
-  FPU_lookahead = 1;
-  if (current->ptrace & PT_PTRACED)
-    FPU_lookahead = 0;
+  /* Don't run ahead if single-stepping.  */
+  FPU_lookahead = (FPU_EFLAGS & X86_EFLAGS_TF) == 0;
 
   if ( !valid_prefix(&byte1, (u_char __user **)&FPU_EIP,
 		     &addr_modes.override) )
@@ -257,7 +255,7 @@ do_another_FPU_instruction:
     }
 
   RE_ENTRANT_CHECK_OFF;
-  FPU_code_verify_area(1);
+  FPU_code_access_ok(1);
   FPU_get_user(FPU_modrm, (u_char __user *) FPU_EIP);
   RE_ENTRANT_CHECK_ON;
   FPU_EIP++;
@@ -589,7 +587,7 @@ static int valid_prefix(u_char *Byte, u_char __user **fpu_eip,
   *override = (overrides) { 0, 0, PREFIX_DEFAULT };       /* defaults */
 
   RE_ENTRANT_CHECK_OFF;
-  FPU_code_verify_area(1);
+  FPU_code_access_ok(1);
   FPU_get_user(byte, ip);
   RE_ENTRANT_CHECK_ON;
 
@@ -635,7 +633,7 @@ static int valid_prefix(u_char *Byte, u_char __user **fpu_eip,
 	do_next_byte:
 	  ip++;
 	  RE_ENTRANT_CHECK_OFF;
-	  FPU_code_verify_area(1);
+	  FPU_code_access_ok(1);
 	  FPU_get_user(byte, ip);
 	  RE_ENTRANT_CHECK_ON;
 	  break;
@@ -686,7 +684,7 @@ int restore_i387_soft(void *s387, struct _fpstate __user *buf)
   int offset, other, i, tags, regnr, tag, newtop;
 
   RE_ENTRANT_CHECK_OFF;
-  FPU_verify_area(VERIFY_READ, d, 7*4 + 8*10);
+  FPU_access_ok(VERIFY_READ, d, 7*4 + 8*10);
   if (__copy_from_user(&S387->cwd, d, 7*4))
     return -1;
   RE_ENTRANT_CHECK_ON;
@@ -732,7 +730,7 @@ int save_i387_soft(void *s387, struct _fpstate __user * buf)
   int offset = (S387->ftop & 7) * 10, other = 80 - offset;
 
   RE_ENTRANT_CHECK_OFF;
-  FPU_verify_area(VERIFY_WRITE, d, 7*4 + 8*10);
+  FPU_access_ok(VERIFY_WRITE, d, 7*4 + 8*10);
 #ifdef PECULIAR_486
   S387->cwd &= ~0xe080;
   /* An 80486 sets nearly all of the reserved bits to 1. */
@@ -742,7 +740,8 @@ int save_i387_soft(void *s387, struct _fpstate __user * buf)
   S387->fcs &= ~0xf8000000;
   S387->fos |= 0xffff0000;
 #endif /* PECULIAR_486 */
-  __copy_to_user(d, &S387->cwd, 7*4);
+  if (__copy_to_user(d, &S387->cwd, 7*4))
+    return -1;
   RE_ENTRANT_CHECK_ON;
 
   d += 7*4;