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

powerpc: Extended ptrace interface

Browse Source 
powerpc: Extended ptrace interface

From: Dave Kleikamp <shaggy@linux.vnet.ibm.com>

Based on patches originally written by Torez Smith.

Add a new extended ptrace interface so that user-space has a single
interface for powerpc, without having to know the specific layout
of the debug registers.

Implement:
PPC_PTRACE_GETHWDEBUGINFO
PPC_PTRACE_SETHWDEBUG
PPC_PTRACE_DELHWDEBUG

Signed-off-by: Dave Kleikamp <shaggy@linux.vnet.ibm.com>
Acked-by: David Gibson <dwg@au1.ibm.com>
Cc: Torez Smith  <lnxtorez@linux.vnet.ibm.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Josh Boyer <jwboyer@linux.vnet.ibm.com>
Cc: Kumar Gala <galak@kernel.crashing.org>
Cc: Sergio Durigan Junior <sergiodj@br.ibm.com>
Cc: Thiago Jung Bauermann <bauerman@br.ibm.com>
Cc: linuxppc-dev list <Linuxppc-dev@ozlabs.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Dave Kleikamp
2010-02-08 11:51:05 +00:00
committed by Benjamin Herrenschmidt
parent 172ae2e7f8
commit 3162d92dfb
3 changed files with 301 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

90
arch/powerpc/kernel/ptrace.c
View File

@@ -835,6 +835,52 @@ void ptrace_disable(struct task_struct *child)
user_disable_single_step(child);
}
static long ppc_set_hwdebug(struct task_struct *child,
struct ppc_hw_breakpoint *bp_info)
{
/*
* We currently support one data breakpoint
*/
if (((bp_info->trigger_type & PPC_BREAKPOINT_TRIGGER_RW) == 0) ||
((bp_info->trigger_type & ~PPC_BREAKPOINT_TRIGGER_RW) != 0) ||
(bp_info->trigger_type != PPC_BREAKPOINT_TRIGGER_WRITE) ||
(bp_info->addr_mode != PPC_BREAKPOINT_MODE_EXACT) ||
(bp_info->condition_mode != PPC_BREAKPOINT_CONDITION_NONE))
return -EINVAL;
if (child->thread.dabr)
return -ENOSPC;
if ((unsigned long)bp_info->addr >= TASK_SIZE)
return -EIO;
child->thread.dabr = (unsigned long)bp_info->addr;
#ifdef CONFIG_PPC_ADV_DEBUG_REGS
child->thread.dbcr0 = DBCR0_IDM;
if (bp_info->trigger_type & PPC_BREAKPOINT_TRIGGER_READ)
child->thread.dbcr0 |= DBSR_DAC1R;
if (bp_info->trigger_type & PPC_BREAKPOINT_TRIGGER_WRITE)
child->thread.dbcr0 |= DBSR_DAC1W;
child->thread.regs->msr |= MSR_DE;
#endif
return 1;
}
static long ppc_del_hwdebug(struct task_struct *child, long addr, long data)
{
if (data != 1)
return -EINVAL;
if (child->thread.dabr == 0)
return -ENOENT;
child->thread.dabr = 0;
#ifdef CONFIG_PPC_ADV_DEBUG_REGS
child->thread.dbcr0 &= ~(DBSR_DAC1R | DBSR_DAC1W | DBCR0_IDM);
child->thread.regs->msr &= ~MSR_DE;
#endif
return 0;
}
/*
* Here are the old "legacy" powerpc specific getregs/setregs ptrace calls,
* we mark them as obsolete now, they will be removed in a future version
@@ -928,6 +974,50 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data)
break;
}
case PPC_PTRACE_GETHWDBGINFO: {
struct ppc_debug_info dbginfo;
dbginfo.version = 1;
dbginfo.num_instruction_bps = 0;
dbginfo.num_data_bps = 1;
dbginfo.num_condition_regs = 0;
#ifdef CONFIG_PPC64
dbginfo.data_bp_alignment = 8;
#else
dbginfo.data_bp_alignment = 4;
#endif
dbginfo.sizeof_condition = 0;
dbginfo.features = 0;
if (!access_ok(VERIFY_WRITE, data,
sizeof(struct ppc_debug_info)))
return -EFAULT;
ret = __copy_to_user((struct ppc_debug_info __user *)data,
&dbginfo, sizeof(struct ppc_debug_info)) ?
-EFAULT : 0;
break;
}
case PPC_PTRACE_SETHWDEBUG: {
struct ppc_hw_breakpoint bp_info;
if (!access_ok(VERIFY_READ, data,
sizeof(struct ppc_hw_breakpoint)))
return -EFAULT;
ret = __copy_from_user(&bp_info,
(struct ppc_hw_breakpoint __user *)data,
sizeof(struct ppc_hw_breakpoint)) ?
-EFAULT : 0;
if (!ret)
ret = ppc_set_hwdebug(child, &bp_info);
break;
}
case PPC_PTRACE_DELHWDEBUG: {
ret = ppc_del_hwdebug(child, addr, data);
break;
}
case PTRACE_GET_DEBUGREG: {
ret = -EINVAL;
/* We only support one DABR and no IABRS at the moment */