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[POWERPC] user_regset PTRACE_SETREGS regression fix 

The PTRACE_SETREGS request was only recently added on powerpc,
and gdb does not use it.  So it slipped through without getting
all the testing it should have had.

The user_regset changes had a simple bug in storing to all of
the 32-bit general registers block on 64-bit kernels.  This bug
only comes up with PTRACE_SETREGS, not PPC_PTRACE_SETREGS.
It causes a BUG_ON to hit, so this fix needs to go in ASAP.

Signed-off-by: Roland McGrath <roland@redhat.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Roland McGrath 2008-03-13 19:25:35 +11:00 committed by Paul Mackerras
parent 264e3e889d
commit c2372eb9bc
1 changed files with 8 additions and 2 deletions
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10
arch/powerpc/kernel/ptrace.c
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@ -530,15 +530,21 @@ static int gpr32_set(struct task_struct *target,
--count;
}
if (kbuf)
if (kbuf) {
for (; count > 0 && pos <= PT_MAX_PUT_REG; --count)
regs[pos++] = *k++;
else
for (; count > 0 && pos < PT_TRAP; --count, ++pos)
++k;
} else {
for (; count > 0 && pos <= PT_MAX_PUT_REG; --count) {
if (__get_user(reg, u++))
return -EFAULT;
regs[pos++] = reg;
}
for (; count > 0 && pos < PT_TRAP; --count, ++pos)
if (__get_user(reg, u++))
return -EFAULT;
}
if (count > 0 && pos == PT_TRAP) {
if (kbuf)