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Message-ID: <5591903D.7090108@linaro.org>
Date: Mon, 29 Jun 2015 14:36:45 -0400
From: David Long <dave.long@...aro.org>
To: Steve Capper <steve.capper@...aro.org>
CC: Catalin Marinas <catalin.marinas@....com>,
Will Deacon <will.deacon@....com>,
"linux-arm-kernel@...ts.infradead.org"
<linux-arm-kernel@...ts.infradead.org>,
Russell King <linux@....linux.org.uk>,
sandeepa.s.prabhu@...il.com, William Cohen <wcohen@...hat.com>,
"Jon Medhurst (Tixy)" <tixy@...aro.org>,
Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
Ananth N Mavinakayanahalli <ananth@...ibm.com>,
Anil S Keshavamurthy <anil.s.keshavamurthy@...el.com>,
David Miller <davem@...emloft.net>,
Mark Brown <broonie@...nel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v7 1/7] arm64: Add HAVE_REGS_AND_STACK_ACCESS_API feature
On 06/29/15 13:23, Steve Capper wrote:
> On 15 June 2015 at 20:07, David Long <dave.long@...aro.org> wrote:
>> From: "David A. Long" <dave.long@...aro.org>
>>
>> Add HAVE_REGS_AND_STACK_ACCESS_API feature for arm64.
>>
>> Signed-off-by: David A. Long <dave.long@...aro.org>
>> ---
>> arch/arm64/Kconfig | 1 +
>> arch/arm64/include/asm/ptrace.h | 25 +++++++++++++
>> arch/arm64/kernel/ptrace.c | 77 +++++++++++++++++++++++++++++++++++++++++
>> 3 files changed, 103 insertions(+)
>>
>> diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
>> index 7796af4..966091f 100644
>> --- a/arch/arm64/Kconfig
>> +++ b/arch/arm64/Kconfig
>> @@ -68,6 +68,7 @@ config ARM64
>> select HAVE_PERF_EVENTS
>> select HAVE_PERF_REGS
>> select HAVE_PERF_USER_STACK_DUMP
>> + select HAVE_REGS_AND_STACK_ACCESS_API
>> select HAVE_RCU_TABLE_FREE
>> select HAVE_SYSCALL_TRACEPOINTS
>> select IRQ_DOMAIN
>> diff --git a/arch/arm64/include/asm/ptrace.h b/arch/arm64/include/asm/ptrace.h
>> index d6dd9fd..8f440e9 100644
>> --- a/arch/arm64/include/asm/ptrace.h
>> +++ b/arch/arm64/include/asm/ptrace.h
>> @@ -118,6 +118,8 @@ struct pt_regs {
>> u64 syscallno;
>> };
>>
>> +#define MAX_REG_OFFSET (sizeof(struct user_pt_regs) - sizeof(u64))
>> +
>> #define arch_has_single_step() (1)
>>
>> #ifdef CONFIG_COMPAT
>> @@ -146,6 +148,29 @@ struct pt_regs {
>> #define user_stack_pointer(regs) \
>> (!compat_user_mode(regs) ? (regs)->sp : (regs)->compat_sp)
>>
>> +/**
>> + * regs_get_register() - get register value from its offset
>> + * @regs: pt_regs from which register value is gotten
>> + * @offset: offset number of the register.
>> + *
>> + * regs_get_register returns the value of a register whose offset from @regs.
>> + * The @offset is the offset of the register in struct pt_regs.
>> + * If @offset is bigger than MAX_REG_OFFSET, this returns 0.
>> + */
>> +static inline u64 regs_get_register(struct pt_regs *regs,
>> + unsigned int offset)
>> +{
>> + if (unlikely(offset > MAX_REG_OFFSET))
>> + return 0;
>> + return *(u64 *)((u64)regs + offset);
>
> Why not:
> return regs->regs[offset];
>
This would not be correct. The offset is a byte offset and your code
would index eight times that amount into the structure. The offset
needs to remain a byte offset so architecture-independent code does not
need to know the architecture-specific layout of the structure.
>> +}
>> +
>> +/* Valid only for Kernel mode traps. */
>> +static inline unsigned long kernel_stack_pointer(struct pt_regs *regs)
>> +{
>> + return regs->sp;
>> +}
>> +
>> static inline unsigned long regs_return_value(struct pt_regs *regs)
>> {
>> return regs->regs[0];
>> diff --git a/arch/arm64/kernel/ptrace.c b/arch/arm64/kernel/ptrace.c
>> index d882b83..f6199a5 100644
>> --- a/arch/arm64/kernel/ptrace.c
>> +++ b/arch/arm64/kernel/ptrace.c
>> @@ -48,6 +48,83 @@
>> #define CREATE_TRACE_POINTS
>> #include <trace/events/syscalls.h>
>>
>> +#define ARM_pstate pstate
>> +#define ARM_pc pc
>> +#define ARM_sp sp
>> +#define ARM_x30 regs[30]
>> +#define ARM_x29 regs[29]
>> +#define ARM_x28 regs[28]
>> +#define ARM_x27 regs[27]
>> +#define ARM_x26 regs[26]
>> +#define ARM_x25 regs[25]
>> +#define ARM_x24 regs[24]
>> +#define ARM_x23 regs[23]
>> +#define ARM_x22 regs[22]
>> +#define ARM_x21 regs[21]
>> +#define ARM_x20 regs[20]
>> +#define ARM_x19 regs[19]
>> +#define ARM_x18 regs[18]
>> +#define ARM_x17 regs[17]
>> +#define ARM_x16 regs[16]
>> +#define ARM_x15 regs[15]
>> +#define ARM_x14 regs[14]
>> +#define ARM_x13 regs[13]
>> +#define ARM_x12 regs[12]
>> +#define ARM_x11 regs[11]
>> +#define ARM_x10 regs[10]
>> +#define ARM_x9 regs[9]
>> +#define ARM_x8 regs[8]
>> +#define ARM_x7 regs[7]
>> +#define ARM_x6 regs[6]
>> +#define ARM_x5 regs[5]
>> +#define ARM_x4 regs[4]
>> +#define ARM_x3 regs[3]
>> +#define ARM_x2 regs[2]
>> +#define ARM_x1 regs[1]
>> +#define ARM_x0 regs[0]
>> +
>> +#define REG_OFFSET_NAME(r) \
>> + {.name = #r, .offset = offsetof(struct pt_regs, ARM_##r)}
>> +#define REG_OFFSET_END {.name = NULL, .offset = 0}
>> +
>> +const struct pt_regs_offset regs_offset_table[] = {
>> + REG_OFFSET_NAME(x0),
>> + REG_OFFSET_NAME(x1),
>> + REG_OFFSET_NAME(x2),
>> + REG_OFFSET_NAME(x3),
>> + REG_OFFSET_NAME(x4),
>> + REG_OFFSET_NAME(x5),
>> + REG_OFFSET_NAME(x6),
>> + REG_OFFSET_NAME(x7),
>> + REG_OFFSET_NAME(x8),
>> + REG_OFFSET_NAME(x9),
>> + REG_OFFSET_NAME(x10),
>> + REG_OFFSET_NAME(x11),
>> + REG_OFFSET_NAME(x12),
>> + REG_OFFSET_NAME(x13),
>> + REG_OFFSET_NAME(x14),
>> + REG_OFFSET_NAME(x15),
>> + REG_OFFSET_NAME(x16),
>> + REG_OFFSET_NAME(x17),
>> + REG_OFFSET_NAME(x18),
>> + REG_OFFSET_NAME(x19),
>> + REG_OFFSET_NAME(x20),
>> + REG_OFFSET_NAME(x21),
>> + REG_OFFSET_NAME(x22),
>> + REG_OFFSET_NAME(x23),
>> + REG_OFFSET_NAME(x24),
>> + REG_OFFSET_NAME(x25),
>> + REG_OFFSET_NAME(x26),
>> + REG_OFFSET_NAME(x27),
>> + REG_OFFSET_NAME(x28),
>> + REG_OFFSET_NAME(x29),
>> + REG_OFFSET_NAME(x30),
>> + REG_OFFSET_NAME(sp),
>> + REG_OFFSET_NAME(pc),
>> + REG_OFFSET_NAME(pstate),
>> + REG_OFFSET_END,
>> +};
>> +
>> /*
>> * TODO: does not yet catch signals sent when the child dies.
>> * in exit.c or in signal.c.
>> --
>> 1.8.1.2
>>
Thanks,
-dl
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