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powerpc/watchpoint/ptrace: Introduce PPC_DEBUG_FEATURE_DATA_BP_ARCH_31 

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
zero-sugar-mainline-defconfig
Ravi Bangoria 2020-09-02 09:59:44 +05:30 committed by Michael Ellerman
parent 58da5984d2
commit fa725cc53d
3 changed files with 4 additions and 0 deletions
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1
Documentation/powerpc/ptrace.rst
View File

@ -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

1
arch/powerpc/include/uapi/asm/ptrace.h
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@ -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__

2
arch/powerpc/kernel/ptrace/ptrace-noadv.c
View File

@ -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,