powerpc/watchpoint/ptrace: Introduce PPC_DEBUG_FEATURE_DATA_BP_ARCH_31 (fa725cc5) · Commits · 戴 / test

PPC_DEBUG_FEATURE_DATA_BP_ARCH_31 can be used to determine whether we are running on an ISA 3.1 compliant machine. Which is needed to determine DAR behaviour, 512 byte boundary limit etc. This was requested by Pedro Miraglia Franco de Carvalho for extending watchpoint features in gdb. Note that availability of 2nd DAWR is independent of this flag and should be checked using ppc_debug_info->num_data_bps. Signed-off-by:

Ravi Bangoria <ravi.bangoria@linux.ibm.com> Signed-off-by:

Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20200902042945.129369-8-ravi.bangoria@linux.ibm.com

Documentation/powerpc/ptrace.rst

+1 −0

Original line number	Diff line number	Diff line
		@@ -46,6 +46,7 @@ features will have bits indicating whether there is support for::
		#define PPC_DEBUG_FEATURE_DATA_BP_RANGE 0x4
		#define PPC_DEBUG_FEATURE_DATA_BP_MASK 0x8
		#define PPC_DEBUG_FEATURE_DATA_BP_DAWR 0x10
		#define PPC_DEBUG_FEATURE_DATA_BP_ARCH_31 0x20

		2. PTRACE_SETHWDEBUG

arch/powerpc/include/uapi/asm/ptrace.h

+1 −0

Original line number	Diff line number	Diff line
		@@ -222,6 +222,7 @@ struct ppc_debug_info {
		#define PPC_DEBUG_FEATURE_DATA_BP_RANGE 0x0000000000000004
		#define PPC_DEBUG_FEATURE_DATA_BP_MASK 0x0000000000000008
		#define PPC_DEBUG_FEATURE_DATA_BP_DAWR 0x0000000000000010
		#define PPC_DEBUG_FEATURE_DATA_BP_ARCH_31 0x0000000000000020

		#ifndef __ASSEMBLY__

arch/powerpc/kernel/ptrace/ptrace-noadv.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -57,6 +57,8 @@ void ppc_gethwdinfo(struct ppc_debug_info *dbginfo)
		} else {
		dbginfo->features = 0;
		}
		if (cpu_has_feature(CPU_FTR_ARCH_31))
		dbginfo->features \|= PPC_DEBUG_FEATURE_DATA_BP_ARCH_31;
		}

		int ptrace_get_debugreg(struct task_struct *child, unsigned long addr,

Admin message