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| author | Michael Neuling <mikey@neuling.org> | 2012-12-20 18:06:44 +0400 |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2013-01-10 10:01:44 +0400 |
| commit | 9422de3e953d0e60eb95f5430a9dd803eec1c6d7 (patch) | |
| tree | 7255a4a2b873a0c3daf7b312a0845202edf6b2d5 /arch/powerpc/kernel/ptrace32.c | |
| parent | a8190a59e7440a7e3f7c0889d72a13e157988b3c (diff) | |
| download | linux-9422de3e953d0e60eb95f5430a9dd803eec1c6d7.tar.xz | |
powerpc: Hardware breakpoints rewrite to handle non DABR breakpoint registers
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>
Diffstat (limited to 'arch/powerpc/kernel/ptrace32.c')
| -rw-r--r-- | arch/powerpc/kernel/ptrace32.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/arch/powerpc/kernel/ptrace32.c b/arch/powerpc/kernel/ptrace32.c index 8c21658719d9..c0244e766834 100644 --- a/arch/powerpc/kernel/ptrace32.c +++ b/arch/powerpc/kernel/ptrace32.c @@ -252,6 +252,9 @@ long compat_arch_ptrace(struct task_struct *child, compat_long_t request, } case PTRACE_GET_DEBUGREG: { +#ifndef CONFIG_PPC_ADV_DEBUG_REGS + unsigned long dabr_fake; +#endif ret = -EINVAL; /* We only support one DABR and no IABRS at the moment */ if (addr > 0) @@ -259,7 +262,10 @@ long compat_arch_ptrace(struct task_struct *child, compat_long_t request, #ifdef CONFIG_PPC_ADV_DEBUG_REGS ret = put_user(child->thread.dac1, (u32 __user *)data); #else - ret = put_user(child->thread.dabr, (u32 __user *)data); + dabr_fake = ( + (child->thread.hw_brk.address & (~HW_BRK_TYPE_DABR)) | + (child->thread.hw_brk.type & HW_BRK_TYPE_DABR)); + ret = put_user(dabr_fake, (u32 __user *)data); #endif break; } |