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Date: Thu, 23 Jun 2016 09:48:11 -0400
From: David Long <dave.long@...aro.org>
To: Li Bin <huawei.libin@...wei.com>,
Catalin Marinas <catalin.marinas@....com>,
Huang Shijie <shijie.huang@....com>,
James Morse <james.morse@....com>,
Marc Zyngier <marc.zyngier@....com>,
Pratyush Anand <panand@...hat.com>,
Sandeepa Prabhu <sandeepa.s.prabhu@...il.com>,
Will Deacon <will.deacon@....com>,
William Cohen <wcohen@...hat.com>,
linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
Steve Capper <steve.capper@...aro.org>,
Masami Hiramatsu <mhiramat@...nel.org>
Cc: Adam Buchbinder <adam.buchbinder@...il.com>,
Alex Bennée <alex.bennee@...aro.org>,
Andrew Morton <akpm@...ux-foundation.org>,
Andrey Ryabinin <ryabinin.a.a@...il.com>,
Ard Biesheuvel <ard.biesheuvel@...aro.org>,
Christoffer Dall <christoffer.dall@...aro.org>,
Daniel Thompson <daniel.thompson@...aro.org>,
Dave P Martin <Dave.Martin@....com>,
Jens Wiklander <jens.wiklander@...aro.org>,
Jisheng Zhang <jszhang@...vell.com>,
John Blackwood <john.blackwood@...r.com>,
Mark Rutland <mark.rutland@....com>,
Petr Mladek <pmladek@...e.com>,
Robin Murphy <robin.murphy@....com>,
Suzuki K Poulose <suzuki.poulose@....com>,
Vladimir Murzin <Vladimir.Murzin@....com>,
Yang Shi <yang.shi@...aro.org>,
Zi Shen Lim <zlim.lnx@...il.com>,
yalin wang <yalin.wang2010@...il.com>,
Mark Brown <broonie@...nel.org>,
Hanjun Guo <guohanjun@...wei.com>,
Ding Tianhong <dingtianhong@...wei.com>
Subject: Re: [PATCH v13 01/10] arm64: Add HAVE_REGS_AND_STACK_ACCESS_API
feature
On 06/19/2016 10:43 PM, Li Bin wrote:
>
>
> on 2016/6/3 11:26, David Long wrote:
>> From: "David A. Long" <dave.long@...aro.org>
>>
>> Add HAVE_REGS_AND_STACK_ACCESS_API feature for arm64, including supporting
>> functions and defines.
>>
>> Signed-off-by: David A. Long <dave.long@...aro.org>
>> ---
>> arch/arm64/Kconfig | 1 +
>> arch/arm64/include/asm/ptrace.h | 54 +++++++++++++++++-
>> arch/arm64/kernel/ptrace.c | 118 ++++++++++++++++++++++++++++++++++++++++
>> 3 files changed, 172 insertions(+), 1 deletion(-)
>>
>> diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
>> index 76747d9..0f7a624 100644
>> --- a/arch/arm64/Kconfig
>> +++ b/arch/arm64/Kconfig
>> @@ -85,6 +85,7 @@ 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 IOMMU_DMA if IOMMU_SUPPORT
>> diff --git a/arch/arm64/include/asm/ptrace.h b/arch/arm64/include/asm/ptrace.h
>> index a307eb6..c130f2b 100644
>> --- a/arch/arm64/include/asm/ptrace.h
>> +++ b/arch/arm64/include/asm/ptrace.h
>> @@ -74,6 +74,7 @@
>> #define COMPAT_PT_DATA_ADDR 0x10004
>> #define COMPAT_PT_TEXT_END_ADDR 0x10008
>> #ifndef __ASSEMBLY__
>> +#include <linux/bug.h>
>>
>> /* sizeof(struct user) for AArch32 */
>> #define COMPAT_USER_SZ 296
>> @@ -119,6 +120,8 @@ struct pt_regs {
>> u64 syscallno;
>> };
>>
>> +#define MAX_REG_OFFSET offsetof(struct pt_regs, pstate)
>> +
>> #define arch_has_single_step() (1)
>>
>> #ifdef CONFIG_COMPAT
>> @@ -147,6 +150,55 @@ struct pt_regs {
>> #define user_stack_pointer(regs) \
>> (!compat_user_mode(regs) ? (regs)->sp : (regs)->compat_sp)
>>
>> +extern int regs_query_register_offset(const char *name);
>> +extern const char *regs_query_register_name(unsigned int offset);
>> +extern bool regs_within_kernel_stack(struct pt_regs *regs, unsigned long addr);
>> +extern unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs,
>> + unsigned int n);
>> +
>> +/**
>> + * regs_get_register() - get register value from its offset
>> + * @regs: pt_regs from which register value is gotten
>> + * @offset: offset 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)
>> +{
>> + u64 val = 0;
>> +
>> + WARN_ON(offset & 7);
>> +
>> + offset >>= 3;
>
> Here, the offset is 3-bits right shifted. So,
>
>> + switch (offset) {
>> + case 0 ... 30:
>> + val = regs->regs[offset];
>> + break;
>> + case offsetof(struct pt_regs, sp):
>
> here should be shifted too, as
>
> case offsetof(struct pt_regs, sp) >> 3:
>
>
>> + val = regs->sp;
>> + break;
>> + case offsetof(struct pt_regs, pc):
>
> and here,
>
>> + val = regs->pc;
>> + break;
>> + case offsetof(struct pt_regs, pstate):
>
> and here.
>
> thanks,
> Li Bin
>
Thanks for pointing this out. It has been fixed now for the v14 patch.
>> + val = regs->pstate;
>> + break;
>> + default:
>> + val = 0;
>> + }
>> +
>> + return val;
>> +}
>> +
>> +/* 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];
>> @@ -156,7 +208,7 @@ static inline unsigned long regs_return_value(struct pt_regs *regs)
>> struct task_struct;
>> int valid_user_regs(struct user_pt_regs *regs, struct task_struct *task);
>>
>> -#define instruction_pointer(regs) ((unsigned long)(regs)->pc)
>> +#define instruction_pointer(regs) ((regs)->pc)
>>
>> extern unsigned long profile_pc(struct pt_regs *regs);
>>
>> diff --git a/arch/arm64/kernel/ptrace.c b/arch/arm64/kernel/ptrace.c
>> index 3f6cd5c..2c88c33 100644
>> --- a/arch/arm64/kernel/ptrace.c
>> +++ b/arch/arm64/kernel/ptrace.c
>> @@ -48,6 +48,124 @@
>> #define CREATE_TRACE_POINTS
>> #include <trace/events/syscalls.h>
>>
>> +struct pt_regs_offset {
>> + const char *name;
>> + int offset;
>> +};
>> +
>> +#define REG_OFFSET_NAME(r) {.name = #r, .offset = offsetof(struct pt_regs, r)}
>> +#define REG_OFFSET_END {.name = NULL, .offset = 0}
>> +#define GPR_OFFSET_NAME(r) \
>> + {.name = "x" #r, .offset = offsetof(struct pt_regs, regs[r])}
>> +
>> +static const struct pt_regs_offset regoffset_table[] = {
>> + GPR_OFFSET_NAME(0),
>> + GPR_OFFSET_NAME(1),
>> + GPR_OFFSET_NAME(2),
>> + GPR_OFFSET_NAME(3),
>> + GPR_OFFSET_NAME(4),
>> + GPR_OFFSET_NAME(5),
>> + GPR_OFFSET_NAME(6),
>> + GPR_OFFSET_NAME(7),
>> + GPR_OFFSET_NAME(8),
>> + GPR_OFFSET_NAME(9),
>> + GPR_OFFSET_NAME(10),
>> + GPR_OFFSET_NAME(11),
>> + GPR_OFFSET_NAME(12),
>> + GPR_OFFSET_NAME(13),
>> + GPR_OFFSET_NAME(14),
>> + GPR_OFFSET_NAME(15),
>> + GPR_OFFSET_NAME(16),
>> + GPR_OFFSET_NAME(17),
>> + GPR_OFFSET_NAME(18),
>> + GPR_OFFSET_NAME(19),
>> + GPR_OFFSET_NAME(20),
>> + GPR_OFFSET_NAME(21),
>> + GPR_OFFSET_NAME(22),
>> + GPR_OFFSET_NAME(23),
>> + GPR_OFFSET_NAME(24),
>> + GPR_OFFSET_NAME(25),
>> + GPR_OFFSET_NAME(26),
>> + GPR_OFFSET_NAME(27),
>> + GPR_OFFSET_NAME(28),
>> + GPR_OFFSET_NAME(29),
>> + GPR_OFFSET_NAME(30),
>> + {.name = "lr", .offset = offsetof(struct pt_regs, regs[30])},
>> + REG_OFFSET_NAME(sp),
>> + REG_OFFSET_NAME(pc),
>> + REG_OFFSET_NAME(pstate),
>> + REG_OFFSET_END,
>> +};
>> +
>> +/**
>> + * regs_query_register_offset() - query register offset from its name
>> + * @name: the name of a register
>> + *
>> + * regs_query_register_offset() returns the offset of a register in struct
>> + * pt_regs from its name. If the name is invalid, this returns -EINVAL;
>> + */
>> +int regs_query_register_offset(const char *name)
>> +{
>> + const struct pt_regs_offset *roff;
>> +
>> + for (roff = regoffset_table; roff->name != NULL; roff++)
>> + if (!strcmp(roff->name, name))
>> + return roff->offset;
>> + return -EINVAL;
>> +}
>> +
>> +/**
>> + * regs_query_register_name() - query register name from its offset
>> + * @offset: the offset of a register in struct pt_regs.
>> + *
>> + * regs_query_register_name() returns the name of a register from its
>> + * offset in struct pt_regs. If the @offset is invalid, this returns NULL;
>> + */
>> +const char *regs_query_register_name(unsigned int offset)
>> +{
>> + const struct pt_regs_offset *roff;
>> +
>> + for (roff = regoffset_table; roff->name != NULL; roff++)
>> + if (roff->offset == offset)
>> + return roff->name;
>> + return NULL;
>> +}
>> +
>> +/**
>> + * regs_within_kernel_stack() - check the address in the stack
>> + * @regs: pt_regs which contains kernel stack pointer.
>> + * @addr: address which is checked.
>> + *
>> + * regs_within_kernel_stack() checks @addr is within the kernel stack page(s).
>> + * If @addr is within the kernel stack, it returns true. If not, returns false.
>> + */
>> +bool regs_within_kernel_stack(struct pt_regs *regs, unsigned long addr)
>> +{
>> + return ((addr & ~(THREAD_SIZE - 1)) ==
>> + (kernel_stack_pointer(regs) & ~(THREAD_SIZE - 1))) ||
>> + on_irq_stack(addr, raw_smp_processor_id());
>> +}
>> +
>> +/**
>> + * regs_get_kernel_stack_nth() - get Nth entry of the stack
>> + * @regs: pt_regs which contains kernel stack pointer.
>> + * @n: stack entry number.
>> + *
>> + * regs_get_kernel_stack_nth() returns @n th entry of the kernel stack which
>> + * is specified by @regs. If the @n th entry is NOT in the kernel stack,
>> + * this returns 0.
>> + */
>> +unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs, unsigned int n)
>> +{
>> + unsigned long *addr = (unsigned long *)kernel_stack_pointer(regs);
>> +
>> + addr += n;
>> + if (regs_within_kernel_stack(regs, (unsigned long)addr))
>> + return *addr;
>> + else
>> + return 0;
>> +}
>> +
>> /*
>> * TODO: does not yet catch signals sent when the child dies.
>> * in exit.c or in signal.c.
>>
>
Thanks,
-dl
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