From: Al Viro <[email protected]> We know this won't be called for child == current, so we don't need to bother with callbacks, etc. - just do unw_init_from_blocked_task(), unw_unwind_to_user() and do the payload of gpregs_[gs]et(). For one register. Which is to say, access_elf_reg().
Signed-off-by: Al Viro <[email protected]> --- arch/ia64/kernel/ptrace.c | 17 ++++++++--------- 1 file changed, 8 insertions(+), 9 deletions(-) diff --git a/arch/ia64/kernel/ptrace.c b/arch/ia64/kernel/ptrace.c index be635f6f93c9..e0813c8e4b47 100644 --- a/arch/ia64/kernel/ptrace.c +++ b/arch/ia64/kernel/ptrace.c @@ -1936,15 +1936,14 @@ access_uarea(struct task_struct *child, unsigned long addr, } if (pos != -1) { - if (write_access) - ret = gpregs_set(child, NULL, pos, - sizeof(unsigned long), data, NULL); - else - ret = gpregs_get(child, NULL, pos, - sizeof(unsigned long), data, NULL); - if (ret != 0) - return -1; - return 0; + struct unw_frame_info info; + + memset(&info, 0, sizeof(info)); + unw_init_from_blocked_task(&info, child); + if (unw_unwind_to_user(&info) < 0) + return 0; + + return access_elf_reg(child, &info, pos, data, write_access); } /* access debug registers */ -- 2.11.0
