Atsushi Nemoto writes:

Current ucontext_t does not match with kernel's definition.  Also, on
N32 ABI, we can not use kernel's struct sigcontext since kernel's
sizeof(long) and user's sizeof(long) is differ.

For both data structure, just importing header files from recent glibc
fixes the mismatch.  So here is a patch importing sys/ucontext.h and
bits/sigcontext.t from glibc-2.5.

1 files changed, 84 insertions, 0 deletions

diff --git a/libc/sysdeps/linux/mips/bits/sigcontext.h b/libc/sysdeps/linux/mips/bits/sigcontext.h
new file mode 100644
index 000000000..99faeed39
--- /dev/null
+++ b/libc/sysdeps/linux/mips/bits/sigcontext.h
@@ -0,0 +1,84 @@
+/* Copyright (C) 1996, 1997, 1998, 2003, 2004, 2006 Free Software
+   Foundation, Inc.  This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+#ifndef _BITS_SIGCONTEXT_H
+#define _BITS_SIGCONTEXT_H 1
+
+#if !defined _SIGNAL_H && !defined _SYS_UCONTEXT_H
+# error "Never use <bits/sigcontext.h> directly; include <signal.h> instead."
+#endif
+
+#include <sgidefs.h>
+
+#if _MIPS_SIM == _ABIO32
+
+/* Certain unused fields were replaced with new ones in 2.6.12-rc4.
+   The changes were as follows:
+
+   sc_cause -> sc_hi1
+   sc_badvaddr -> sc_lo1
+   sc_sigset[0] -> sc_hi2
+   sc_sigset[1] -> sc_lo2
+   sc_sigset[2] -> sc_hi3
+   sc_sigset[3] -> sc_lo3
+
+   sc_regmask, sc_ownedfp and sc_fpc_eir are not used.  */
+struct sigcontext {
+  unsigned int sc_regmask;
+  unsigned int sc_status;
+  unsigned long long sc_pc;
+  unsigned long long sc_regs[32];
+  unsigned long long sc_fpregs[32];
+  unsigned int sc_ownedfp;
+  unsigned int sc_fpc_csr;
+  unsigned int sc_fpc_eir;
+  unsigned int sc_used_math;
+  unsigned int sc_dsp;
+  unsigned long long sc_mdhi;
+  unsigned long long sc_mdlo;
+  unsigned long sc_hi1;
+  unsigned long sc_lo1;
+  unsigned long sc_hi2;
+  unsigned long sc_lo2;
+  unsigned long sc_hi3;
+  unsigned long sc_lo3;
+};
+
+#else
+
+/* This structure changed in 2.6.12-rc4 when DSP support was added.  */
+struct sigcontext {
+  unsigned long long sc_regs[32];
+  unsigned long long sc_fpregs[32];
+  unsigned long long sc_mdhi;
+  unsigned long long sc_hi1;
+  unsigned long long sc_hi2;
+  unsigned long long sc_hi3;
+  unsigned long long sc_mdlo;
+  unsigned long long sc_lo1;
+  unsigned long long sc_lo2;
+  unsigned long long sc_lo3;
+  unsigned long long sc_pc;
+  unsigned int sc_fpc_csr;
+  unsigned int sc_used_math;
+  unsigned int sc_dsp;
+  unsigned int sc_reserved;
+};
+
+#endif /* _MIPS_SIM != _ABIO32 */
+#endif