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From: erny hombre <hombre67@gmx.at>
To: musl@lists.openwall.com
Subject: [musl] Data abort in __set_thread_area
Date: Thu, 4 Jun 2020 21:36:37 +0200	[thread overview]
Message-ID: <trinity-7c4ee463-1932-4f52-ae7a-73091ec42133-1591299397810@3c-app-gmx-bap65> (raw)

Hello,
 
I am writing an operating system for an ARM processor (Cortex-A9). For the user programs I want to use musl libc. I have built a toolchain with musl-cross-make (musl 1.2.0). I can link a user program with libc.a. After loading the program, I call _start. Then I run into a data abort in function __set_thread_area (/musl-1.2.0/src/env/__libc_start_main.c) at this statement:
int ver = *(int *)0xffff0ffc;
The data abort is reasonable, because no memory is mapped at this virtual address. I don't know what's the purpose of this code. Can anybody explain me what this function does and which environment is needed to make it work ?
 
Thanks,
Erwin

             reply	other threads:[~2020-06-04 19:36 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-06-04 19:36 erny hombre [this message]
2020-06-04 19:52 ` Rich Felker

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