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[IA64] access user RBS directly

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Because the user RBS of a process is now completely stored in
user-mode when the process is ptrace-stopped, accesses to the
RBS should no longer augment any part of the kernel RBS.

This means we can get rid of most ia64_peek() and ia64_poke()
calls.

Signed-off-by: Petr Tesarik <ptesarik@suse.cz>
Signed-off-by: Tony Luck <tony.luck@intel.com>
This commit is contained in:
Petr Tesarik 2008-02-11 22:41:18 +01:00 committed by Tony Luck
parent 29e8c3c304
commit 972559a052
1 changed files with 14 additions and 30 deletions
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44
arch/ia64/kernel/ptrace.c
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@ -908,7 +908,7 @@ static int
access_uarea (struct task_struct *child, unsigned long addr,
unsigned long *data, int write_access)
{
unsigned long *ptr, regnum, urbs_end, rnat_addr, cfm;
unsigned long *ptr, regnum, urbs_end, cfm;
struct switch_stack *sw;
struct pt_regs *pt;
# define pt_reg_addr(pt, reg) ((void *) \
@ -1093,16 +1093,8 @@ access_uarea (struct task_struct *child, unsigned long addr,
return 0;
case PT_AR_RNAT:
urbs_end = ia64_get_user_rbs_end(child, pt, NULL);
rnat_addr = (long) ia64_rse_rnat_addr((long *)
urbs_end);
if (write_access)
return ia64_poke(child, sw, urbs_end,
rnat_addr, *data);
else
return ia64_peek(child, sw, urbs_end,
rnat_addr, data);
ptr = pt_reg_addr(pt, ar_rnat);
break;
case PT_R1:
ptr = pt_reg_addr(pt, r1);
break;
@ -1541,11 +1533,10 @@ asmlinkage long
sys_ptrace (long request, pid_t pid, unsigned long addr, unsigned long data)
{
struct pt_regs *pt;
unsigned long urbs_end, peek_or_poke;
unsigned long peek_or_poke;
struct task_struct *child;
struct switch_stack *sw;
long ret;
struct unw_frame_info info;
lock_kernel();
ret = -EPERM;
@ -1593,26 +1584,19 @@ sys_ptrace (long request, pid_t pid, unsigned long addr, unsigned long data)
case PTRACE_PEEKTEXT:
case PTRACE_PEEKDATA:
/* read word at location addr */
urbs_end = ia64_get_user_rbs_end(child, pt, NULL);
ret = ia64_peek(child, sw, urbs_end, addr, &data);
if (ret == 0) {
ret = data;
/* ensure "ret" is not mistaken as an error code: */
force_successful_syscall_return();
if (access_process_vm(child, addr, &data, sizeof(data), 0)
!= sizeof(data)) {
ret = -EIO;
goto out_tsk;
}
ret = data;
/* ensure "ret" is not mistaken as an error code */
force_successful_syscall_return();
goto out_tsk;
case PTRACE_POKETEXT:
case PTRACE_POKEDATA:
/* write the word at location addr */
urbs_end = ia64_get_user_rbs_end(child, pt, NULL);
ret = ia64_poke(child, sw, urbs_end, addr, data);
/* Make sure user RBS has the latest data */
unw_init_from_blocked_task(&info, child);
do_sync_rbs(&info, ia64_sync_user_rbs);
goto out_tsk;
/* PTRACE_POKETEXT and PTRACE_POKEDATA is handled
* by the generic ptrace_request().
*/
case PTRACE_PEEKUSR:
/* read the word at addr in the USER area */