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Message-ID: <20180302180131.GA20579@arm.com>
Date: Fri, 2 Mar 2018 18:01:31 +0000
From: Will Deacon <will.deacon@....com>
To: Douglas Anderson <dianders@...omium.org>
Cc: Catalin Marinas <catalin.marinas@....com>,
briannorris@...omium.org, evgreen@...omium.org,
linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...nel.org>,
linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] arm64/debug: Fix registers on sleeping tasks
On Thu, Mar 01, 2018 at 11:38:03AM -0800, Douglas Anderson wrote:
> This is the equivalent of commit 001bf455d206 ("ARM: 8428/1: kgdb: Fix
> registers on sleeping tasks") but for arm64. Nuff said.
It's a pity that 001bf455d206 doesn't explain *why* past_pt_regs doesn't
work.
Anyway, does this mean you're actually using kgdb on arm64? Does the rest of
it appear to work?
Will
> diff --git a/arch/arm64/kernel/kgdb.c b/arch/arm64/kernel/kgdb.c
> index 2122cd187f19..01285d4dcdc3 100644
> --- a/arch/arm64/kernel/kgdb.c
> +++ b/arch/arm64/kernel/kgdb.c
> @@ -138,14 +138,26 @@ int dbg_set_reg(int regno, void *mem, struct pt_regs *regs)
> void
> sleeping_thread_to_gdb_regs(unsigned long *gdb_regs, struct task_struct *task)
> {
> - struct pt_regs *thread_regs;
> + struct thread_struct *thread = &task->thread;
> + struct cpu_context *cpu_context = &thread->cpu_context;
>
> /* Initialize to zero */
> memset((char *)gdb_regs, 0, NUMREGBYTES);
> - thread_regs = task_pt_regs(task);
> - memcpy((void *)gdb_regs, (void *)thread_regs->regs, GP_REG_BYTES);
> - /* Special case for PSTATE (check comments in asm/kgdb.h for details) */
> - dbg_get_reg(33, gdb_regs + GP_REG_BYTES, thread_regs);
> +
> + gdb_regs[19] = cpu_context->x19;
> + gdb_regs[20] = cpu_context->x20;
> + gdb_regs[21] = cpu_context->x21;
> + gdb_regs[22] = cpu_context->x22;
> + gdb_regs[23] = cpu_context->x23;
> + gdb_regs[24] = cpu_context->x24;
> + gdb_regs[25] = cpu_context->x25;
> + gdb_regs[26] = cpu_context->x26;
> + gdb_regs[27] = cpu_context->x27;
> + gdb_regs[28] = cpu_context->x28;
> + gdb_regs[29] = cpu_context->fp;
> +
> + gdb_regs[31] = cpu_context->sp;
> + gdb_regs[32] = cpu_context->pc;
> }
>
> void kgdb_arch_set_pc(struct pt_regs *regs, unsigned long pc)
> --
> 2.16.2.395.g2e18187dfd-goog
>
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