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Re: struct sigcontext for N32 userland

from [Franck Bui-Huu] [Permanent Link][Original]
To: "Atsushi Nemoto" <anemo@mba.ocn.ne.jp>
Subject: Re: struct sigcontext for N32 userland
From: "Franck Bui-Huu" <vagabon.xyz@gmail.com>
Date: Tue, 13 Feb 2007 09:27:20 +0100
Cc: linux-mips@linux-mips.org
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On 2/12/07, Atsushi Nemoto <anemo@mba.ocn.ne.jp> wrote:

If N32 userland refers asm-mips/sigcontext.h, struct sigcontext cause
some troubles.

#if _MIPS_SIM == _MIPS_SIM_ABI64 || _MIPS_SIM == _MIPS_SIM_NABI32

struct sigcontext {
        unsigned long   sc_regs[32];
...


The kernel use 64-bit for sc_regs[0], and both N32/N64 userland
expects it was 64-bit.  But size of 'long' on N32 is actually 32-bit.
So this definition make some confusion.

glibc has its own sigcontext.h and it uses 'unsigned long long' for
sc_regs, so no real problem with glibc.



Just out of curiosity, for what purpose does the glibc use sigcontext ?


--
              Franck
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