diff options
| author | Alexey Kardashevskiy <aik@ozlabs.ru> | 2013-01-10 20:29:09 +0000 |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2013-01-16 05:25:46 +1100 |
| commit | 1715a826a5b72d4fb882504d0babcea9aec8a0db (patch) | |
| tree | f7f4fc57450c6e5842002f9c459a11a0d7b7ebda /arch/powerpc/include/uapi/asm | |
| parent | 61383407677aef05928541a00678591abea2d84c (diff) | |
powerpc: Add DSCR support to ptrace
The DSCR (aka Data Stream Control Register) is supported on some
server PowerPC chips and allow some control over the prefetch
of data streams.
The kernel already supports DSCR value per thread but there is also
a need in a ability to change it from an external process for
the specific pid.
The patch adds new register index PT_DSCR (index=44) which can be
set/get by:
ptrace(PTRACE_POKEUSER, traced_process, PT_DSCR << 3, dscr);
dscr = ptrace(PTRACE_PEEKUSER, traced_process, PT_DSCR << 3, NULL);
The patch does not increase PT_REGS_COUNT as the pt_regs struct has not
been changed.
Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/include/uapi/asm')
| -rw-r--r-- | arch/powerpc/include/uapi/asm/ptrace.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/powerpc/include/uapi/asm/ptrace.h b/arch/powerpc/include/uapi/asm/ptrace.h index ee67a2bc91b..5a4863c76b5 100644 --- a/arch/powerpc/include/uapi/asm/ptrace.h +++ b/arch/powerpc/include/uapi/asm/ptrace.h @@ -108,6 +108,7 @@ struct pt_regs { #define PT_DAR 41 #define PT_DSISR 42 #define PT_RESULT 43 +#define PT_DSCR 44 #define PT_REGS_COUNT 44 #define PT_FPR0 48 /* each FP reg occupies 2 slots in this space */ |