kernel.git/arch/powerpc/kernel/ptrace.c, branch linux-3.8.y

powerpc/ptrace: Enable hardware breakpoint upon re-registering

2012-11-15T02:01:13Z

On powerpc, ptrace will disable hardware breakpoint request once the breakpoint is hit. It is the responsibility of the caller to set it again. However, when the caller sets the hardware breakpoint again using ptrace(PTRACE_SET_DEBUGREG, child_pid, 0, addr), the hardware breakpoint is not enabled. While gdb's approach is to unregister and re-register the hardware breakpoint every time the breakpoint is hit - which is working fine, this could affect other programs trying to re-register hardware breakpoint without unregistering. This patch enables hardware breakpoint if the caller is re-registering. Signed-off-by: Aravinda Prasad Acked-by: Michael Neuling Signed-off-by: Benjamin Herrenschmidt

powerpc/ptrace: Remove unused addr parameter in ppc_del_hwdebug()

2012-11-15T02:00:29Z

Signed-off-by: Michael Neuling Signed-off-by: Benjamin Herrenschmidt

powerpc/ptrace: Fix spelling mistake

2012-11-15T02:00:26Z

s/intruction/instruction/ Signed-off-by: Michael Neuling Signed-off-by: Benjamin Herrenschmidt

powerpc/hw-breakpoint: Use generic hw-breakpoint interfaces for new PPC ptrace flags

2012-11-15T02:00:23Z

PPC_PTRACE_GETHWDBGINFO, PPC_PTRACE_SETHWDEBUG and PPC_PTRACE_DELHWDEBUG are PowerPC specific ptrace flags that use the watchpoint register. While they are targeted primarily towards BookE users, user-space applications such as GDB have started using them for BookS too. This patch enables the use of generic hardware breakpoint interfaces for these new flags. Apart from the usual benefits of using generic hw-breakpoint interfaces, these changes allow debuggers (such as GDB) to use a common set of ptrace flags for their watchpoint needs and allow more precise breakpoint specification (length of the variable can be specified). Mikey added: rebased and added dbginfo.features around #ifdef CONFIG_HAVE_HW_BREAKPOINT Signed-off-by: K.Prasad Acked-by: David Gibson Signed-off-by: Benjamin Herrenschmidt Signed-off-by: Michael Neuling Signed-off-by: Benjamin Herrenschmidt

powerpc: Rework set_dabr so it can take a DABRX value as well

2012-09-09T23:59:10Z

Rework set_dabr to take a DABRX value as well. Both the pseries and PS3 hypervisors do some checks on the DABRX values that are passed in the hcall. This patch stops bogus values from being passed to hypervisor. Also, in the case where we are clearing the breakpoint, where DABR and DABRX are zero, we modify the DABRX value to make it valid so that the hcall won't fail. Signed-off-by: Michael Neuling Signed-off-by: Benjamin Herrenschmidt

Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc

2012-05-23T16:02:42Z

Pull powerpc updates from Benjamin Herrenschmidt: "Here are the powerpc goodies for 3.5. Main highlights are: - Support for the NX crypto engine in Power7+ - A bunch of Anton goodness, including some micro optimization of our syscall entry on Power7 - I converted a pile of our thermal control drivers to the new i2c APIs (essentially turning the old therm_pm72 into a proper set of windfarm drivers). That's one more step toward removing the deprecated i2c APIs, there's still a few drivers to fix, but we are getting close - kexec/kdump support for 47x embedded cores The big missing thing here is no updates from Freescale. Not sure what's up here, but with Kumar not working for them anymore things are a bit in a state of flux in that area." * 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc: (71 commits) powerpc: Fix irq distribution Revert "powerpc/hw-breakpoint: Use generic hw-breakpoint interfaces for new PPC ptrace flags" powerpc: Fixing a cputhread code documentation powerpc/crypto: Enable the PFO-based encryption device powerpc/crypto: Build files for the nx device driver powerpc/crypto: debugfs routines and docs for the nx device driver powerpc/crypto: SHA512 hash routines for nx encryption powerpc/crypto: SHA256 hash routines for nx encryption powerpc/crypto: AES-XCBC mode routines for nx encryption powerpc/crypto: AES-GCM mode routines for nx encryption powerpc/crypto: AES-ECB mode routines for nx encryption powerpc/crypto: AES-CTR mode routines for nx encryption powerpc/crypto: AES-CCM mode routines for nx encryption powerpc/crypto: AES-CBC mode routines for nx encryption powerpc/crypto: nx driver code supporting nx encryption powerpc/pseries: Enable the PFO-based RNG accelerator powerpc/pseries/hwrng: PFO-based hwrng driver powerpc/pseries: Add PFO support to the VIO bus powerpc/pseries: Add pseries update notifier for OFDT prop changes powerpc/pseries: Add new hvcall constants to support PFO ...

Revert "powerpc/hw-breakpoint: Use generic hw-breakpoint interfaces for new PPC ptrace flags"

2012-05-22T04:37:24Z

This reverts commit 1b788400bbcbfe25280dc0b8000d2142bfe3be3b. It causes oopses when passed incorrect arguments and has a design fault using IPIs with interrupts disabled. Signed-off-by: Benjamin Herrenschmidt ---

powerpc/hw-breakpoint: Use generic hw-breakpoint interfaces for new PPC ptrace flags

2012-05-14T00:48:55Z

PPC_PTRACE_GETHWDBGINFO, PPC_PTRACE_SETHWDEBUG and PPC_PTRACE_DELHWDEBUG are PowerPC specific ptrace flags that use the watchpoint register. While they are targeted primarily towards BookE users, user-space applications such as GDB have started using them for BookS too. This patch enables the use of generic hardware breakpoint interfaces for these new flags. Apart from the usual benefits of using generic hw-breakpoint interfaces, these changes allow debuggers (such as GDB) to use a common set of ptrace flags for their watchpoint needs and allow more precise breakpoint specification (length of the variable can be specified). Signed-off-by: K.Prasad Acked-by: David Gibson Signed-off-by: Benjamin Herrenschmidt

powerpc: Remove old powerpc specific ptrace getregs/setregs calls

2012-04-30T05:37:28Z

PowerPC has non standard getregs calls that only dump the GPRs or FPRs and have their arguments reversed. commit e17666ba48f7 (ptrace updates & new, better requests) in 2.6.3 deprecated them and introduced more standard versions. It's been about 5 years and I know of no users of the old calls so lets remove them. Signed-off-by: Anton Blanchard Signed-off-by: Benjamin Herrenschmidt

seccomp: ignore secure_computing return values

2012-04-18T02:24:50Z

This change is inspired by https://lkml.org/lkml/2012/4/16/14 which fixes the build warnings for arches that don't support CONFIG_HAVE_ARCH_SECCOMP_FILTER. In particular, there is no requirement for the return value of secure_computing() to be checked unless the architecture supports seccomp filter. Instead of silencing the warnings with (void) a new static inline is added to encode the expected behavior in a compiler and human friendly way. v2: - cleans things up with a static inline - removes sfr's signed-off-by since it is a different approach v1: - matches sfr's original change Reported-by: Stephen Rothwell Signed-off-by: Will Drewry Acked-by: Kees Cook Signed-off-by: James Morris