Commit f1290ec9 authored by Andi Kleen's avatar Andi Kleen Committed by Linus Torvalds

[PATCH] x86_64: Use a common function to find code segment bases

To avoid some code duplication.
Signed-off-by: default avatarAndi Kleen <ak@suse.de>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent e502cdd6
......@@ -62,21 +62,19 @@ void bust_spinlocks(int yes)
static noinline int is_prefetch(struct pt_regs *regs, unsigned long addr,
unsigned long error_code)
{
unsigned char *instr = (unsigned char *)(regs->rip);
unsigned char *instr;
int scan_more = 1;
int prefetch = 0;
unsigned char *max_instr = instr + 15;
unsigned char *max_instr;
/* If it was a exec fault ignore */
if (error_code & (1<<4))
return 0;
/* Code segments in LDT could have a non zero base. Don't check
when that's possible */
if (regs->cs & (1<<2))
return 0;
instr = (unsigned char *)convert_rip_to_linear(current, regs);
max_instr = instr + 15;
if ((regs->cs & 3) != 0 && regs->rip >= TASK_SIZE)
if ((regs->cs & 3) != 0 && instr >= (unsigned char *)TASK_SIZE)
return 0;
while (scan_more && instr < max_instr) {
......
......@@ -86,6 +86,11 @@ struct pt_regs {
extern unsigned long profile_pc(struct pt_regs *regs);
void signal_fault(struct pt_regs *regs, void __user *frame, char *where);
struct task_struct;
extern unsigned long
convert_rip_to_linear(struct task_struct *child, struct pt_regs *regs);
enum {
EF_CF = 0x00000001,
EF_PF = 0x00000004,
......
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