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Merge "libc: Provide ucontext_t/mcontext_t/<sys/ucontext.h>"

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David 'Digit' Turner 2012-10-17 07:20:54 -07:00 committed by Gerrit Code Review
commit 4136c3a2b7
14 changed files with 837 additions and 159 deletions
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79
libc/arch-arm/include/machine/signal.h Normal file
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/*
* Copyright (C) 2012 The Android Open Source Project
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef _ARCH_ARM_MACHINE_SIGNAL_H_
#define _ARCH_ARM_MACHINE_SIGNAL_H_
#include <stddef.h>
#include <sys/cdefs.h>
#include <sys/types.h>
__BEGIN_DECLS
/* Include the kernel-specific definitions */
#include <asm/posix_types.h>
#include <asm/signal.h>
#include <asm/sigcontext.h>
#ifdef _ASM_GENERIC_SIGINFO_H
#error "You cannot include <asm/siginfo.h> before <signal.h>!"
#endif
#define __ARCH_SI_UID_T __kernel_uid32_t
#include <asm/siginfo.h>
#undef __ARCH_SI_UID_T
#include <stdint.h>
/* Despite the fact that <linux/types.h> defines sigset_t as a 32-bit type,
* the ARM kernel *really* expects a 64-bit signal set type during syscalls.
*
* The reason for this is that the kernel headers have a different definition
* for sigset_t depending on the value of the __KERNEL__ macro. When we cleanup
* the headers, before placing them under bionic/libc/kernel/, this macro is
* optimized as undefined, to the 32-bit definition stays.
*
* Ironically, the reason the kernel headers do this is to accomodate old
* versions of GLibc. More recent versions provide complete wrappers for the
* corresponding kernel types so don't have this problem (their sigset_t can
* always hold up to 1024 signals, independent of the platform).
*/
typedef unsigned long __kernel_sigset_t[2];
/* _NSIG is used by the SIGRTMAX definition under <asm/signal.h>, however
* its definition is part of a #if __KERNEL__ .. #endif block in the original
* kernel headers and is thus not part of our cleaned-up versions.
*
* Looking at the current kernel sources, it is defined as 64 for ARM.
*/
#ifndef _NSIG
# define _NSIG 64
#endif
__END_DECLS
#endif /* _ARCH_ARM_MACHINE_SIGNAL_H_ */

170
libc/arch-arm/include/machine/ucontext.h Normal file
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/*
* Copyright (C) 2012 The Android Open Source Project
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef _ARCH_ARM_SYS_UCONTEXT_H_
#define _ARCH_ARM_SYS_UCONTEXT_H_
#include <stdint.h>
#include <sys/cdefs.h>
#include <sys/types.h>
#include <machine/signal.h>
__BEGIN_DECLS
/* Technical note:
*
* There are similarities and differences in the way GLibc and the ARM Linux
* kernel declare ucontext_t. Here are the details:
*
* - Both declare mcontext_t as a typedef for 'struct sigcontext'. This goes
* against the GLibc convention of providing a custom mcontext_t declaration
* for all other platforms.
*
* One notable difference on ARM is that to access register values, one
* has to use named fields like "arm_r0", "arm_sp", "arm_pc".
*
* On other platforms, GLibc mcontext_t provides a gregs[] array of
* 32-bit values to access the value of core registers instead. Plus
* some helper enums + macros to index it (e.g. REG_EBP on i386).
*
* Note that some client code, when ported to Android, provide custom
* mcontext_t declaration that use the gregs[] convention. For the sake
* of portability, this header follows the ARM GLibc convention of using
* explicit field names. This means that such client code will need to be
* adapted. Possibly by checking against __BIONIC_HAVE_UCONTEXT_T defined
* in <sys/cdefs.h>
*
* - On ARM, the floating-point state is not stored in mcontext_t.
* Instead, it is stored in the ucontext_t structure, in the '_uc_regspace'
* field at the end, but both the Kernel and GLibc use a different
* convention for exact layout:
*
* * The state saved by the kernel (which would be accessible from the
* ucontext_t received from a SA_SIGINGO handler) has a layout that
* depends on the exact kernel configuration. For more details see
* the "struct aux_sigframe" declaration in the kernel's ucontext.h
* which defines the format. It is *not* exposed by this header.
*
* * The FP state saved by GLibc's getcontext()/setcontext() functions
* uses a different custom storage scheme that depends on the reported
* ELF HWCAPs. If VFP is enabled, only registers d8-d15 are saved to
* the storage space, in addition to some status/exception registers.
* This is not surprising because d0-d7 are callee-saved in the
* ARM EABI.
*
* It also looks like this implementation cannot handle VFPv3-D32/NEON
* by saving/restoring the state of d16-d31 available on these CPUs.
*
* Note that client code that needs to access the FP state typically
* does so through ptrace() using the special PTRACE_GETVFPREGS op.
* This is what gdbserver and debuggerd use to extract that information.
*
* In conclusion, there is no reliable way to extract the FP state from
* a ucontext_t on ARM.
*
* - The ARM GLibc ucontext.h defines a 'struct _libc_fpstate' structure
* that is never used by GLibc source code, and which doesn't seem to
* match either the kernel of getcontext/setcontext() layout.
*
* It was introduced by the following patch, reason is unclear but may be
* related to the GLibc test suite:
*
* http://www.cygwin.com/ml/libc-ports/2011-12/msg00032.html
*
* This header does *not* define this type, or fpregset_t either.
*
* Reference source files:
* $KERNEL/arch/arm/include/asm/fpstate.h
* $KERNEL/arch/arm/include/asm/sigcontext.h
* $KERNEL/arch/arm/include/asm/ucontext.h
* $KERNEL/arch/arm/include/asm/user.h
*
* $GLIBC/ports/sysdeps/unix/sysv/linux/arm/getcontext.S
* $GLIBC/ports/sysdeps/unix/sysv/linux/arm/setcontext.S
* $GLIBC/ports/sysdeps/unix/sysv/linux/arm/sys/ucontext.h
*/
/* First, the kernel-compatible version, for reference. */
typedef struct __kernel_ucontext {
unsigned long uc_flags;
struct __kernel_ucontext* uc_link;
stack_t uc_stack;
struct sigcontext uc_mcontext;
__kernel_sigset_t uc_sigmask;
/* The kernel reserves 1024 bits for the signal mask, even if it only
* uses the first 64 ones. */
int _unused[32 - (sizeof(__kernel_sigset_t) / sizeof(int))];
/* Used to store coprocessor + VFP register state on ARMv7-A */
unsigned long uc_regspace[128] __attribute__((__aligned__(8)));
} __kernel_ucontext_t;
/* Second, the GLibc-compatible version */
/* On ARM, GLibc mcontext_t is a simple typedef to 'struct sigcontext',
* just like the kernel does. This means that to access register values,
* you will need to use the specific named field (e.g. 'arm_r0', 'arm_pc').
*
* Note that on all other platforms, GLibc uses a gregs[] array instead.
* Follow the GLibc logic, or lack of, for ease of portability.
*
* Curiously, GLibc also defines enums and macros for REG_R0 .. REG_R15,
* plus the gregset_t type, NREGS macro, fpregset_t types, etc.. while they
* are never used by any code. They are *not* declared here.
*
* This also means there is no 'official' or 'documented' way to access
* the state of the FP registers (while the GLibc implementation does
* save/restore them in getcontext()/swapcontext()).
*/
typedef struct sigcontext mcontext_t;
/* Technical note:
*
* GLibc defines an ARM-specific 'struct _libc_fpstate' that seems to match
* the FPU state stored in uc_regspace[] below. However, its declaration does
* not match either the kernel declaration, or the actual GLibc
* implementation of *context() functions.
*
* It is suspected that this is a remnant of the obsolete VFPv1 era that
* was never updated. As such, client code shall *not* rely on this and
* there is no definition for it provided here.
*/
typedef struct ucontext {
uint32_t uc_flags;
struct ucontext* uc_link;
stack_t uc_stack;
mcontext_t uc_mcontext;
/* Only expose the 32 non-realtime signals in Bionic's 32-bit sigset_t
* The _unused field is required padding from the kernel. */
sigset_t uc_sigmask;
int _unused[32 - sizeof(sigset_t)/sizeof(int)];
uint32_t uc_regspace[128] __attribute__((__aligned__(8)));
} ucontext_t;
__END_DECLS
#endif /* _ARCH_ARM_SYS_UCONTEXT_H_ */

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libc/arch-mips/bionic/_setjmp.S
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#include <machine/asm.h>
#include <machine/regnum.h>
#include <machine/signal.h>
#include <machine/setjmp.h>
/*
* _setjmp, _longjmp (not restoring signal state)

2
libc/arch-mips/bionic/setjmp.S
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@ -31,7 +31,7 @@
#include <machine/asm.h>
#include <machine/regnum.h>
#include <machine/signal.h>
#include <machine/setjmp.h>
/*
* setjmp, longjmp implementation for libc. this code depends

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libc/arch-mips/include/machine/setjmp.h
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@ -1,10 +1,56 @@
/* $OpenBSD: setjmp.h,v 1.2 2004/08/10 21:10:56 pefo Exp $ */
/*
* Copyright (C) 2012 The Android Open Source Project
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
/* Public domain */
#ifndef _MIPS_SETJMP_H_
#define _MIPS_SETJMP_H_
#ifndef _ARCH_MIPS_MACHINE_SETJMP_H_
#define _ARCH_MIPS_MACHINE_SETJMP_H_
#define _JBLEN 157 /* size, in longs, of a jmp_buf */
#endif /* !_MIPS_SETJMP_H_ */
#define SC_REGMASK (0*REGSZ)
#define SC_STATUS (1*REGSZ)
#define SC_PC (2*REGSZ)
#define SC_REGS (SC_PC+8)
#define SC_FPREGS (SC_REGS+32*8)
#define SC_ACX (SC_FPREGS+32*REGSZ_FP)
#define SC_FPC_CSR (SC_ACX+1*REGSZ)
#define SC_FPC_EIR (SC_ACX+2*REGSZ)
#define SC_USED_MATH (SC_ACX+3*REGSZ)
#define SC_DSP (SC_ACX+4*REGSZ)
#define SC_MDHI (SC_ACX+5*REGSZ)
#define SC_MDLO (SC_MDHI+8)
#define SC_HI1 (SC_MDLO+8)
#define SC_LO1 (SC_HI1+1*REGSZ)
#define SC_HI2 (SC_HI1+2*REGSZ)
#define SC_LO2 (SC_HI1+3*REGSZ)
#define SC_HI3 (SC_HI1+4*REGSZ)
#define SC_LO3 (SC_HI1+5*REGSZ)
/* OpenBSD compatibility */
#define SC_MASK SC_REGMASK
#define SC_FPUSED SC_USED_MATH
#endif /* !_ARCH_MIPS_INCLUDE_MACHINE_SETJMP_H_ */

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libc/arch-mips/include/machine/signal.h
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/* $OpenBSD: signal.h,v 1.8 2006/01/09 18:18:37 millert Exp $ */
/*
* Copyright (c) 1992, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Ralph Campbell.
* Copyright (C) 2012 The Android Open Source Project
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)signal.h 8.1 (Berkeley) 6/10/93
*/
#ifndef _MIPS_SIGNAL_H_
#define _MIPS_SIGNAL_H_
#ifndef _ARCH_MIPS_MACHINE_SIGNAL_H_
#define _ARCH_MIPS_MACHINE_SIGNAL_H_
#include <sys/cdefs.h>
#if !defined(__LANGUAGE_ASSEMBLY)
#include <sys/types.h>
__BEGIN_DECLS
/*
* Machine-dependent signal definitions
*/
typedef int sig_atomic_t;
#include <asm/signal.h>
#include <asm/sigcontext.h>
#if __BSD_VISIBLE || __XPG_VISIBLE >= 420
/*
* Information pushed on stack when a signal is delivered.
* This is used by the kernel to restore state following
* execution of the signal handler. It is also made available
* to the handler to allow it to restore state properly if
* a non-standard exit is performed.
*/
#if defined(__ANDROID__)
/*
* The Linux and OpenBSD sigcontext structures are slightly different
* This is the Linux O32 ABI compatible sigcontext
*/
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_acx;
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
struct sigcontext {
long sc_onstack; /* sigstack state to restore */
long sc_mask; /* signal mask to restore */
__register_t sc_pc; /* pc at time of signal */
__register_t sc_regs[32]; /* processor regs 0 to 31 */
__register_t mullo; /* mullo and mulhi registers... */
__register_t mulhi; /* mullo and mulhi registers... */
f_register_t sc_fpregs[33]; /* fp regs 0 to 31 and csr */
long sc_fpused; /* fp has been used */
long sc_fpc_eir; /* floating point exception instruction reg */
long xxx[8]; /* XXX reserved */
};
#ifdef _ASM_GENERIC_SIGINFO_H
#error "You cannot include <asm/siginfo.h> before <signal.h>!"
#endif
#endif /* __BSD_VISIBLE || __XPG_VISIBLE >= 420 */
#define __ARCH_SI_UID_T __kernel_uid32_t
#include <asm/siginfo.h>
#undef __ARCH_SI_UID_T
#else /* __LANGUAGE_ASSEMBLY */
#include <stdint.h>
#ifdef __ANDROID__
/* See comment in arch-arm/include/machine/signal.h.
* The MIPS kernel also uses 128-bit signal masks while defining sigset-t
* as a 32-bit type.
*/
typedef unsigned long __kernel_sigset_t[4];
#define SC_REGMASK (0*REGSZ)
#define SC_STATUS (1*REGSZ)
#define SC_PC (2*REGSZ)
#define SC_REGS (SC_PC+8)
#define SC_FPREGS (SC_REGS+32*8)
#define SC_ACX (SC_FPREGS+32*REGSZ_FP)
#define SC_FPC_CSR (SC_ACX+1*REGSZ)
#define SC_FPC_EIR (SC_ACX+2*REGSZ)
#define SC_USED_MATH (SC_ACX+3*REGSZ)
#define SC_DSP (SC_ACX+4*REGSZ)
#define SC_MDHI (SC_ACX+5*REGSZ)
#define SC_MDLO (SC_MDHI+8)
#define SC_HI1 (SC_MDLO+8)
#define SC_LO1 (SC_HI1+1*REGSZ)
#define SC_HI2 (SC_HI1+2*REGSZ)
#define SC_LO2 (SC_HI1+3*REGSZ)
#define SC_HI3 (SC_HI1+4*REGSZ)
#define SC_LO3 (SC_HI1+5*REGSZ)
/* OpenBSD compatibility */
#define SC_MASK SC_REGMASK
#define SC_FPUSED SC_USED_MATH
/* Note: Unlike ARM and x86, the MIPS <asm/signal.h> properly defines _NSIG
* and thus SIGRTMAX. */
#else
__END_DECLS
#define SC_ONSTACK (0 * REGSZ)
#define SC_MASK (1 * REGSZ)
#define SC_PC (2 * REGSZ)
#define SC_REGS (3 * REGSZ)
#define SC_MULLO (35 * REGSZ)
#define SC_MULHI (36 * REGSZ)
#define SC_FPREGS (37 * REGSZ)
#define SC_FPUSED (70 * REGSZ)
#define SC_FPC_EIR (71 * REGSZ)
#endif /* __ANDROID__ */
#endif /* __LANGUAGE_ASSEMBLY */
#endif /* !_MIPS_SIGNAL_H_ */
#endif /* _ARCH_MIPS_MACHINE_SIGNAL_H_ */

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

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@ -0,0 +1,67 @@
/*
* Copyright (C) 2012 The Android Open Source Project
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef _ARCH_X86_MACHINE_SIGNAL_H_
#define _ARCH_X86_MACHINE_SIGNAL_H_
#include <stddef.h>
#include <sys/types.h>
#include <sys/cdefs.h>
__BEGIN_DECLS
#include <asm/signal.h>
#include <asm/sigcontext.h>
#ifdef _ASM_GENERIC_SIGINFO_H
#error "You cannot include <asm/siginfo.h> before <signal.h>!"
#endif
#define __ARCH_SI_UID_T __kernel_uid32_t
#include <asm/siginfo.h>
#undef __ARCH_SI_UID_T
#include <stdint.h>
/* See comment in arch-arm/include/machine/signal.h.
* The x86 kernel also uses 64-bit signal masks while defining sigset-t
* as a 32-bit type.
*/
typedef unsigned long __kernel_sigset_t[2];
/* _NSIG is used by the SIGRTMAX definition under <asm/signal.h>, however
* its definition is part of a #if __KERNEL__ .. #endif block in the original
* kernel headers and is thus not part of our cleaned-up versions.
*
* Looking at the current kernel sources, it is defined as 64 for x86.
*/
#ifndef _NSIG
# define _NSIG 64
#endif
__END_DECLS
#endif /* _ARCH_X86_MACHINE_SIGNAL_H_ */

184
libc/arch-x86/include/machine/ucontext.h Normal file
View file

@ -0,0 +1,184 @@
/*
* Copyright (C) 2012 The Android Open Source Project
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef _ARCH_X86_SYS_UCONTEXT_H_
#define _ARCH_X86_SYS_UCONTEXT_H_
#include <signal.h>
#include <stdint.h>
__BEGIN_DECLS
/* Technical note:
*
* On x86, there are differences in the way GLibc and the Linux kernel declare
* ucontext_t. Here are the details (they differ from ARM significantly):
*
* - The kernel implements 'uc_mcontext' with a 'struct sigcontext',
* while GLibc defines 'mcontext_t' in a binary-compatible way
* (same size, same binary layout), but with different field naming/access
* conventions.
*
* The biggest difference is that 'struct sigcontext' requires named fields
* like "eax", or "ebp" to access the state of register values, while GLibc
* provides an array (gregs[]) of 32-bit values, that can be accessed
* through indexing, plus some enum/macros like REG_EAX or REG_ESP to get
* to specific register values.
*
* For maximum portability of existing client code, this header follows
* the GLibc convention. Client code, and the C library, should never
* try to include <asm/ucontext.h>
*
* - The floating-point state is not stored in the mcontext_t. For historical
* reasons, the 'fpregs' field of 'mcontext_t' is really a pointer to a
* different block of memory. More specifically:
*
* * When passed to a signal handler, the pointer points to some memory
* on the signal stack, populated by the kernel before calling the
* handler in user space.
*
* * In GLibc's getcontext()/setcontext() implementation, the pointer will
* point to the ucontext_t structure (more specifically the __fpregs_mem
* field after uc_sigmask).
*
* * Note that in both cases, the pointer can be NULL if no floating-point
* operation has been performed on the current thread yet.
*
* - The 'struct _libc_fpstate' structure declared by GLibc corresponds to
* both the FP state managed by getcontext()/setcontext(), and the start
* of the FP state stored by the kernel and passed to a signal handler.
*
* This matches the data saved by the FNSTENV IA-32 instruction.
*
* IMPORTANT: GLibc does not save the MMX/SSE state, i.e. it does not use
* FXSAVE / FXRSTOR instructions in *context() functions.
*
* It is used by client code to retrieve the state of the FPU registers
* (e.g. Google Breakpad does that).
*
* Reference source files:
* $KERNEL/arch/x86/include/asm/sigcontext_32.h
* $KERNEL/arch/x86/include/asm/sigcontext.h
* $KERNEL/arch/x86/include/asm/ucontext.h
*
* $GLIBC/sysdeps/unix/sysv/linux/i386/getcontext.S
* $GLIBC/sysdeps/unix/sysv/linux/i386/setcontext.S
* $GLIBC/sysdeps/unix/sysv/linux/x86/sys/ucontext.h
*/
/* First, the kernel-compatible version, for reference. */
typedef struct __kernel_ucontext {
unsigned long uc_flags;
struct __kernel_ucontext* uc_link;
stack_t uc_stack;
struct sigcontext uc_mcontext;
__kernel_sigset_t uc_sigmask;
} __kernel_ucontext_t;
/* Second, the GLibc-compatible version */
#define NGREG 19
typedef int greg_t;
typedef greg_t gregset_t[NGREG];
enum {
REG_GS = 0, REG_FS, REG_ES, REG_DS,
REG_EDI, REG_ESI, REG_EBP, REG_ESP,
REG_EBX, REG_EDX, REG_ECX, REG_EAX,
REG_TRAPNO, REG_ERR, REG_EIP, REG_CS,
REG_EFL, REG_UESP, REG_SS
};
/* GLibc defines both macros and enums. Probably to let client do
* #ifdef REG_XXXX ... #endif. Do the same here. */
#define REG_GS REG_GS
#define REG_FS REG_FS
#define REG_ES REG_ES
#define REG_DS REG_DS
#define REG_EDI REG_EDI
#define REG_ESI REG_ESI
#define REG_EBP REG_EBP
#define REG_ESP REG_ESP
#define REG_EBX REG_EBX
#define REG_EDX REG_EDX
#define REG_ECX REG_ECX
#define REG_EAX REG_EAX
#define REG_TRAPNO REG_TRAPNO
#define REG_ERR REG_ERR
#define REG_EIP REG_EIP
#define REG_CS REG_CS
#define REG_EFL REG_EFL
#define REG_UESP REG_UESP
#define REG_SS REG_SS
/* 80-bit floating-point register */
struct _libc_fpreg {
unsigned short significand[4];
unsigned short exponent;
};
/* Simple floating-point state, see FNSTENV instruction */
struct _libc_fpstate {
unsigned long cw;
unsigned long sw;
unsigned long tag;
unsigned long ipoff;
unsigned long cssel;
unsigned long dataoff;
unsigned long datasel;
struct _libc_fpreg _st[8];
unsigned long status;
};
typedef struct _libc_fpstate* fpregset_t;
typedef struct {
gregset_t gregs;
fpregset_t fpregs; /* Really a pointer to _libc_fpstate! */
} mcontext_t;
typedef struct ucontext {
uint32_t uc_flags;
struct ucontext* uc_link;
stack_t uc_stack;
mcontext_t uc_mcontext;
/* Only expose the 32 non-realtime signals in Bionic's 32-bit sigset_t
* The _unused field is required padding from the kernel. */
sigset_t uc_sigmask;
char _unused[sizeof(__kernel_sigset_t) - sizeof(sigset_t)];
/* Storage area for *context() functions only - private, don't use. */
struct _libc_fpstate __fpregs_mem;
/* Growth opportunity - in case we want to save MMX/SSE stuff there too */
int _unused2[128 - sizeof(struct _libc_fpstate)/sizeof(int)];
} ucontext_t;
__END_DECLS
#endif /* _ARCH_X86_SYS_UCONTEXT_H_ */

6
libc/bionic/pthread.c
View file

@ -2107,7 +2107,7 @@ int pthread_kill(pthread_t tid, int sig)
*/
typedef union {
sigset_t bionic;
uint32_t kernel[2];
__kernel_sigset_t kernel;
} kernel_sigset_t;
/* this is a private syscall stub */
@ -2124,8 +2124,8 @@ int pthread_sigmask(int how, const sigset_t *set, sigset_t *oset)
kernel_sigset_t in_set, *in_set_ptr;
kernel_sigset_t out_set;
in_set.kernel[0] = in_set.kernel[1] = 0;
out_set.kernel[0] = out_set.kernel[1] = 0;
memset(&in_set.kernel, 0, sizeof(in_set.kernel));
memset(&out_set.kernel, 0, sizeof(out_set.kernel));
/* 'in_set_ptr' is the second parameter to __rt_sigprocmask. It must be NULL
* if 'set' is NULL to ensure correct semantics (which in this case would

64
libc/include/signal.h
View file

@ -29,29 +29,61 @@
#define _SIGNAL_H_
#include <sys/cdefs.h>
#include <sys/types.h>
#include <machine/signal.h>
#include <machine/ucontext.h>
#include <limits.h> /* For LONG_BIT */
#include <string.h> /* For memset() */
#include <sys/types.h>
#include <asm/signal.h>
#define __ARCH_SI_UID_T __kernel_uid32_t
#include <asm/siginfo.h>
#undef __ARCH_SI_UID_T
__BEGIN_DECLS
typedef int sig_atomic_t;
/* _NSIG is used by the SIGRTMAX definition under <asm/signal.h>, however
* its definition is part of a #if __KERNEL__ .. #endif block in the original
* kernel headers and is thus not part of our cleaned-up versions.
/* Previous versions of <signal.h> didn't define 'struct sigcontext'. This
* has led client code to redefine the structure, sometimes in a custom and
* incompatible way.
*
* Looking at the current kernel sources, it is defined as 64 for all
* architectures except for the 'mips' one which set it to 128.
* The __BIONIC_HAVE_STRUCT_SIGCONTEXT macro is defined in <sys/cdefs.h>
* to indicate that <signal.h> does indeed define the structure. For
* maximum source compatibility, client code should follow these guidelines:
*
* - If client code is guaranteed to build against a recent NDK/platform
* version, just include <signal.h> as usual, and use the
* 'struct sigcontext'.
*
* - If client code wants to build against older NDK/platform versions,
* and only uses 'struct sigcontext' without accessing _any_
* of its fields, just always include <asm/sigcontext.h> on Android
* to ensure maximum portability (i.e. to old platform/NDK releases).
* As in:
*
* #include <signal.h>
* #ifdef __BIONIC__
* #include <asm/sigcontext.h>
* #endif
*
* - Otherwise, if the client has a custom sigcontext definition and wants to
* keep it to minimize source changes, use a macro trick as below to avoid
* naming conflicts:
*
* #include <signal.h>
* #ifdef __BIONIC__
* # include <asm/sigcontext.h>
* # ifdef __BIONIC_HAVE_STRUCT_SIGCONTEXT
* # undef sigcontext
* # define sigcontext my_custom_sigcontext
* # endif
* #endif
*/
#ifndef _NSIG
# define _NSIG 64
#endif
/* Similarly, previous versions of the C library didn't define ucontext_t
* and mcontext_t in <signal.h>, or <sys/ucontext.h>. Client code can check
* against the macro __BIONIC_HAVE_UCONTEXT_T to determine if it does.
*
* Beware, that does _not_ mean that <ucontext.h> and related functions are
* available.
*/
typedef int sig_atomic_t;
extern const char * const sys_siglist[];
extern const char * const sys_signame[];

8
libc/include/sys/cdefs.h
View file

@ -510,4 +510,12 @@
#define __BIONIC_FORTIFY_UNKNOWN_SIZE ((size_t) -1)
#endif
/* Indicates to client code that <signal.h> now defines 'struct sigcontext'
* properly. See comments in <signal.h> */
#define __BIONIC_HAVE_STRUCT_SIGCONTEXT 1
/* Indicates to client code that <signal.h> now defines 'ucontext_t' */
/* NOTE: That does not mean that <ucontext.h> is available! */
#define __BIONIC_HAVE_UCONTEXT_T 1
#endif /* !_SYS_CDEFS_H_ */

43
libc/include/sys/ucontext.h Normal file
View file

@ -0,0 +1,43 @@
/*
* Copyright (C) 2012 The Android Open Source Project
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef _SYS_UCONTEXT_H_
#define _SYS_UCONTEXT_H_
/* While not standard, this header is typically provided by GLibc and the
* BSD C library to provide for the definition of ucontext_t and mcontext_t,
* without the declarations of the deprecated *context() functions in
* <ucontext.h>.
*
* Client code that directly includes this file exists. Note that
* the better, POSIX-compliant, way to get these declarations is to include
* <signal.h>.
*/
#include <machine/ucontext.h>
#endif /* _SYS_UCONTEXT_H_ */

5
libc/include/time.h
View file

@ -30,10 +30,7 @@
#include <sys/cdefs.h>
#include <sys/time.h>
#define __ARCH_SI_UID_T __kernel_uid32_t
#include <asm/siginfo.h>
#undef __ARCH_SI_UID_T
#include <machine/signal.h> /* for struct sigevent */
__BEGIN_DECLS