c124baaf29
This patch updates the C library headers to provide ucontext_t definitions for three architectures. + Fix <signal.h> to always define 'struct sigcontext'. The new declarations are announced with new macros defined in <sys/cdefs.h> in order to make it easier to adapt client code that already defines its own, incompatible, versions of the structures seen here. http://code.google.com/p/android/issues/detail?id=34784 Change-Id: Ie78c48690a4ce61c50593f6c39639be7fead3596
142 lines
4.4 KiB
C
142 lines
4.4 KiB
C
/*
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* Copyright (C) 2012 The Android Open Source Project
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef _ARCH_MIPS_SYS_UCONTEXT_H_
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#define _ARCH_MIPS_SYS_UCONTEXT_H_
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#include <signal.h>
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#include <stdint.h>
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__BEGIN_DECLS
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/* Technical note:
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*
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* On MIPS, there are differences in the way GLibc and the Linux kernel declare
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* ucontext_t:
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*
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* - The kernel implements 'uc_mcontext' with a 'struct sigcontext',
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* while GLibc defines 'mcontext_t' in a binary-compatible way
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* (same size, same binary layout), but with different field naming/access
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* convention.
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*
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* The biggest difference is the naming of the fields. The kernel uses
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* a 'sc_' prefix (e.g. "sc_gregs[]"), while GLibc does not ("gregs[]").
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*
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* For maximum portability of existing client code, this header follows
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* the GLibc convention. Client code, and the C library, should never
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* try to include <asm/ucontext.h>
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*
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* Apart from that, all floating point state is stored in uc_mcontext
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* in the same way, which is much simpler than ARM and x86 schemes for it.
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* As such, there is no _libc_fpstate.
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*
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* Reference source files:
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* $KERNEL/arch/mips/include/asm/sigcontext.h
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* $KERNEL/arch/mips/include/asm/ucontext.h
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*
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* $GLIBC/sysdeps/unix/sysv/linux/mips/getcontext.S
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* $GLIBC/sysdeps/unix/sysv/linux/mips/setcontext.S
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* $GLIBC/sysdeps/unix/sysv/linux/mips/sys/ucontext.h
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*/
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/* First, the kernel-compatible version, for reference. */
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typedef struct __kernel_ucontext {
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unsigned long uc_flags;
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struct __kernel_ucontext* uc_link;
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stack_t uc_stack;
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struct sigcontext uc_mcontext;
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__kernel_sigset_t uc_sigmask;
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} __kernel_ucontext_t;
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/* Second, the GLibc-compatible version */
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__extension__ /* Required to build in ANSI C mode */
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typedef unsigned long long greg_t;
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#define NGREG 32
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#define NFPREG 32
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typedef greg_t gregset_t[NGREG];
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typedef struct fpregset {
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union {
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double fp_dregs[NFPREG];
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struct {
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float _fp_fregs;
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unsigned _fp_pad;
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} fp_fregs[NFPREG];
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} fp_r;
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} fpregset_t;
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#ifndef _MIPS_SIM
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#error "_MIPS_SIM should be defined by your Android MIPS toolchain!"
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#endif
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#ifndef _OABI32
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#error "_OABI32 should be defined by your Android MIPS toolchain!"
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#endif
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#if _MIPS_SIM != _OABI32
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#error "Only _OABI32 is supported on Android MIPS!"
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#endif
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typedef struct {
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unsigned regmask;
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unsigned status;
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greg_t pc;
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gregset_t gregs;
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fpregset_t fpregs;
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unsigned fp_owned;
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unsigned fpc_csr;
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unsigned fpc_eir;
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unsigned used_math;
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unsigned dsp;
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greg_t mdhi;
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greg_t mdlo;
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unsigned hi1;
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unsigned lo1;
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unsigned hi2;
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unsigned lo2;
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unsigned hi3;
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unsigned lo3;
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} mcontext_t;
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typedef struct ucontext {
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uint32_t uc_flags;
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struct ucontext* uc_link;
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stack_t uc_stack;
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mcontext_t uc_mcontext;
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/* Only expose the signals in Bionic's 32-bit sigset_t.
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* The _unused field is required padding from the kernel. */
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sigset_t uc_sigmask;
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char _unused[sizeof(__kernel_sigset_t) - sizeof(sigset_t)];
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} ucontext_t;
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__END_DECLS
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#endif /* _ARCH_MIPS_SYS_UCONTEXT_H_ */
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