xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

powerpc: Hardware breakpoints rewrite to handle non DABR breakpoint registers

Browse Source 
This is a rewrite so that we don't assume we are using the DABR throughout the
code.  We now use the arch_hw_breakpoint to store the breakpoint in a generic
manner in the thread_struct, rather than storing the raw DABR value.

The ptrace GET/SET_DEBUGREG interface currently passes the raw DABR in from
userspace.  We keep this functionality, so that future changes (like the POWER8
DAWR), will still fake the DABR to userspace.

Signed-off-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Michael Neuling
2012-12-20 14:06:44 +00:00
committed by Benjamin Herrenschmidt
parent a8190a59e7
commit 9422de3e95
14 changed files with 187 additions and 129 deletions
Download Patch File Download Diff File Expand all files Collapse all files

5
arch/powerpc/kernel/signal.c
View File

@@ -130,8 +130,9 @@ static int do_signal(struct pt_regs *regs)
* user space. The DABR will have been cleared if it
* triggered inside the kernel.
*/
if (current->thread.dabr)
set_dabr(current->thread.dabr, current->thread.dabrx);
if (current->thread.hw_brk.address &&
current->thread.hw_brk.type)
set_break(&current->thread.hw_brk);
#endif
/* Re-enable the breakpoints for the signal stack */
thread_change_pc(current, regs);