Re: [RFC PATCH 7/7 v1]powerpc: Deliver SEGV signal on protection key violation.
From: Michael Ellerman <mpe@ellerman.id.au>
Date: 2017-06-16 11:18:37
Also in:
lkml
Ram Pai [off-list ref] writes:
quoted hunk ↗ jump to hunk
diff --git a/arch/powerpc/include/uapi/asm/ptrace.h b/arch/powerpc/include/uapi/asm/ptrace.h index 8036b38..109d0c2 100644 --- a/arch/powerpc/include/uapi/asm/ptrace.h +++ b/arch/powerpc/include/uapi/asm/ptrace.h@@ -49,6 +49,8 @@ struct pt_regs { unsigned long dar; /* Fault registers */ unsigned long dsisr; /* on 4xx/Book-E used for ESR */ unsigned long result; /* Result of a system call */ + unsigned long dscr; /* contents of the DSCR register */ + unsigned long amr; /* contents of AMR register */ };
You can't change pt_regs, it's ABI.
quoted hunk ↗ jump to hunk
@@ -109,7 +111,8 @@ struct pt_regs { #define PT_DSISR 42 #define PT_RESULT 43 #define PT_DSCR 44 -#define PT_REGS_COUNT 44 +#define PT_AMR 45 +#define PT_REGS_COUNT 45
You can add PT_AMR, but it has to be synthetic like DSCR, ie. not actually in pt_regs but available via ptrace. But do we want to do that? How does the x86 code export the key(s) of a process? Or doesn't it? cheers