From: Alistair Popple <alistair@popple.id.au>
To: Jordan Niethe <jniethe5@gmail.com>
Cc: npiggin@gmail.com, bala24@linux.ibm.com,
naveen.n.rao@linux.vnet.ibm.com, linuxppc-dev@lists.ozlabs.org,
dja@axtens.net
Subject: Re: [PATCH v7 13/28] powerpc: Add a probe_user_read_inst() function
Date: Mon, 04 May 2020 18:30:56 +1000 [thread overview]
Message-ID: <1788028.fjJG1VDcy6@townsend> (raw)
In-Reply-To: <20200501034220.8982-14-jniethe5@gmail.com>
Looks good.
Reviewed-by: Alistair Popple <alistair@popple.id.au>
On Friday, 1 May 2020 1:42:05 PM AEST Jordan Niethe wrote:
> Introduce a probe_user_read_inst() function to use in cases where
> probe_user_read() is used for getting an instruction. This will be more
> useful for prefixed instructions.
>
> Signed-off-by: Jordan Niethe <jniethe5@gmail.com>
> ---
> v6: - New to series
> ---
> arch/powerpc/include/asm/inst.h | 3 +++
> arch/powerpc/lib/Makefile | 2 +-
> arch/powerpc/lib/inst.c | 18 ++++++++++++++++++
> arch/powerpc/mm/fault.c | 2 +-
> 4 files changed, 23 insertions(+), 2 deletions(-)
> create mode 100644 arch/powerpc/lib/inst.c
>
> diff --git a/arch/powerpc/include/asm/inst.h
> b/arch/powerpc/include/asm/inst.h index 552e953bf04f..3e9a58420151 100644
> --- a/arch/powerpc/include/asm/inst.h
> +++ b/arch/powerpc/include/asm/inst.h
> @@ -37,4 +37,7 @@ static inline bool ppc_inst_equal(struct ppc_inst x,
> struct ppc_inst y) return ppc_inst_val(x) == ppc_inst_val(y);
> }
>
> +int probe_user_read_inst(struct ppc_inst *inst,
> + struct ppc_inst *nip);
> +
> #endif /* _ASM_INST_H */
> diff --git a/arch/powerpc/lib/Makefile b/arch/powerpc/lib/Makefile
> index b8de3be10eb4..546591848219 100644
> --- a/arch/powerpc/lib/Makefile
> +++ b/arch/powerpc/lib/Makefile
> @@ -16,7 +16,7 @@ CFLAGS_code-patching.o += -DDISABLE_BRANCH_PROFILING
> CFLAGS_feature-fixups.o += -DDISABLE_BRANCH_PROFILING
> endif
>
> -obj-y += alloc.o code-patching.o feature-fixups.o pmem.o
> +obj-y += alloc.o code-patching.o feature-fixups.o pmem.o inst.o
>
> ifndef CONFIG_KASAN
> obj-y += string.o memcmp_$(BITS).o
> diff --git a/arch/powerpc/lib/inst.c b/arch/powerpc/lib/inst.c
> new file mode 100644
> index 000000000000..eaf786afad2b
> --- /dev/null
> +++ b/arch/powerpc/lib/inst.c
> @@ -0,0 +1,18 @@
> +// SPDX-License-Identifier: GPL-2.0-or-later
> +/*
> + * Copyright 2020, IBM Corporation.
> + */
> +
> +#include <linux/uaccess.h>
> +#include <asm/inst.h>
> +
> +int probe_user_read_inst(struct ppc_inst *inst,
> + struct ppc_inst *nip)
> +{
> + unsigned int val;
> + int err;
> +
> + err = probe_user_read(&val, nip, sizeof(val));
> + *inst = ppc_inst(val);
> + return err;
> +}
> diff --git a/arch/powerpc/mm/fault.c b/arch/powerpc/mm/fault.c
> index 4a50f125ec18..f3a943eae305 100644
> --- a/arch/powerpc/mm/fault.c
> +++ b/arch/powerpc/mm/fault.c
> @@ -281,7 +281,7 @@ static bool bad_stack_expansion(struct pt_regs *regs,
> unsigned long address, access_ok(nip, sizeof(*nip))) {
> struct ppc_inst inst;
>
> - if (!probe_user_read(&inst, nip, sizeof(inst)))
> + if (!probe_user_read_inst(&inst, (struct ppc_inst __user *)nip))
> return !store_updates_sp(inst);
> *must_retry = true;
> }
next prev parent reply other threads:[~2020-05-04 8:32 UTC|newest]
Thread overview: 53+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-01 3:41 [PATCH v7 00/28] Initial Prefixed Instruction support Jordan Niethe
2020-05-01 3:41 ` [PATCH v7 01/28] powerpc/xmon: Remove store_inst() for patch_instruction() Jordan Niethe
2020-05-01 3:41 ` [PATCH v7 02/28] powerpc/xmon: Move breakpoint instructions to own array Jordan Niethe
2020-05-04 5:41 ` Alistair Popple
2020-05-04 5:52 ` Jordan Niethe
2020-05-01 3:41 ` [PATCH v7 03/28] powerpc/xmon: Move breakpoints to text section Jordan Niethe
2020-05-01 3:41 ` [PATCH v7 04/28] powerpc/xmon: Use bitwise calculations in_breakpoint_table() Jordan Niethe
2020-05-04 5:41 ` Alistair Popple
2020-05-05 7:08 ` Michael Ellerman
2020-05-05 7:31 ` Jordan Niethe
2020-05-01 3:41 ` [PATCH v7 05/28] powerpc: Change calling convention for create_branch() et. al Jordan Niethe
2020-05-04 2:55 ` Alistair Popple
2020-05-01 3:41 ` [PATCH v7 06/28] powerpc: Use a macro for creating instructions from u32s Jordan Niethe
2020-05-04 5:54 ` Alistair Popple
2020-05-01 3:41 ` [PATCH v7 07/28] powerpc: Use an accessor for instructions Jordan Niethe
2020-05-01 3:42 ` [PATCH v7 08/28] powerpc: Use a function for getting the instruction op code Jordan Niethe
2020-05-04 8:01 ` Alistair Popple
2020-05-01 3:42 ` [PATCH v7 09/28] powerpc: Use a function for byte swapping instructions Jordan Niethe
2020-05-01 3:42 ` [PATCH v7 10/28] powerpc: Introduce functions for instruction equality Jordan Niethe
2020-05-01 3:42 ` [PATCH v7 11/28] powerpc: Use a datatype for instructions Jordan Niethe
2020-05-02 14:29 ` kbuild test robot
2020-05-01 3:42 ` [PATCH v7 12/28] powerpc: Use a function for reading instructions Jordan Niethe
2020-05-04 8:26 ` Alistair Popple
2020-05-01 3:42 ` [PATCH v7 13/28] powerpc: Add a probe_user_read_inst() function Jordan Niethe
2020-05-04 8:30 ` Alistair Popple [this message]
2020-05-01 3:42 ` [PATCH v7 14/28] powerpc: Add a probe_kernel_read_inst() function Jordan Niethe
2020-05-04 9:24 ` Alistair Popple
2020-05-01 3:42 ` [PATCH v7 15/28] powerpc/kprobes: Use patch_instruction() Jordan Niethe
2020-05-05 1:41 ` Alistair Popple
2020-05-01 3:42 ` [PATCH v7 16/28] powerpc: Define and use __get_user_instr{, inatomic}() Jordan Niethe
2020-05-05 1:46 ` Alistair Popple
2020-05-01 3:42 ` [PATCH v7 17/28] powerpc: Introduce a function for reporting instruction length Jordan Niethe
2020-05-05 2:02 ` Alistair Popple
2020-05-01 3:42 ` [PATCH v7 18/28] powerpc/xmon: Use a function for reading instructions Jordan Niethe
2020-05-05 2:07 ` Alistair Popple
2020-05-01 3:42 ` [PATCH v7 19/28] powerpc/xmon: Move insertion of breakpoint for xol'ing Jordan Niethe
2020-05-05 2:19 ` Alistair Popple
2020-05-01 3:42 ` [PATCH v7 20/28] powerpc: Make test_translate_branch() independent of instruction length Jordan Niethe
2020-05-05 2:40 ` Alistair Popple
2020-05-01 3:42 ` [PATCH v7 21/28] powerpc: Enable Prefixed Instructions Jordan Niethe
2020-05-01 3:42 ` [PATCH v7 22/28] powerpc: Define new SRR1 bits for a future ISA version Jordan Niethe
2020-05-05 2:49 ` Alistair Popple
2020-05-01 3:42 ` [PATCH v7 23/28] powerpc: Add prefixed instructions to instruction data type Jordan Niethe
2020-05-05 6:04 ` Alistair Popple
2020-05-01 3:42 ` [PATCH v7 24/28] powerpc: Test prefixed code patching Jordan Niethe
2020-05-05 6:08 ` Alistair Popple
2020-05-01 3:42 ` [PATCH v7 25/28] powerpc: Test prefixed instructions in feature fixups Jordan Niethe
2020-05-05 7:15 ` Alistair Popple
2020-05-05 7:34 ` Jordan Niethe
2020-05-01 3:42 ` [PATCH v7 26/28] powerpc: Support prefixed instructions in alignment handler Jordan Niethe
2020-05-05 7:17 ` Alistair Popple
2020-05-01 3:42 ` [PATCH v7 27/28] powerpc sstep: Add support for prefixed load/stores Jordan Niethe
2020-05-01 3:42 ` [PATCH v7 28/28] powerpc sstep: Add support for prefixed fixed-point arithmetic Jordan Niethe
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