From: Dimitar Dimitrov <dimitar@dinux.eu>
To: newlib@sourceware.org
Subject: Re: [PATCH] pru: Fix memory corruption on syscall return
Date: Wed, 01 Jul 2020 23:11:14 +0300 [thread overview]
Message-ID: <2078940.72y95cczBC@tpdeb> (raw)
In-Reply-To: <20200603161422.18902-1-dimitar@dinux.eu>
On сряда, 3 юни 2020 г. 19:14:22 EEST Dimitar Dimitrov wrote:
> In the initial code I missed one level of pointer indirection. Instead
> of storing errno in impure_data, _impure_ptr was corrupted.
>
> Only simulator is impacted. Real targets have no OS and no syscalls.
>
> This resolves a bunch of stdio cases from the GCC testsuite:
> FAIL->PASS: gcc.c-torture/execute/printf-2.c -O0 execution test
>
> Signed-off-by: Dimitar Dimitrov <dimitar@dinux.eu>
> ---
> libgloss/pru/syscalls.S | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/libgloss/pru/syscalls.S b/libgloss/pru/syscalls.S
> index 8ed7601a4..3ad0d9215 100644
> --- a/libgloss/pru/syscalls.S
> +++ b/libgloss/pru/syscalls.S
> @@ -42,6 +42,7 @@ __SC_ret:
> /* Invert return code and store to errno (first int in _impure_ptr). */
> rsb r14, r14, 0
> ldi32 r1, _impure_ptr
> + lbbo r1, r1, 0, 4
> sbbo r14, r1, 0, 4
> /* Return -1 (for both int32_t or int64_t). */
> fill r14, 8
Gentle ping
next prev parent reply other threads:[~2020-07-01 20:11 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-03 16:14 Dimitar Dimitrov
2020-07-01 20:11 ` Dimitar Dimitrov [this message]
2020-07-02 9:00 ` Corinna Vinschen
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