Use breakpad_getcontext on all Linux platforms missing getcontext

getcontext is also not available on musl libc, so generalize
breakpad_getcontext so it can be used as a fallback for non-Android
platforms as well.

On x86_64 and i386, ucontext_t uses an Android-specific offset for
storage of FP registers, since its sigset_t differs in size. So,
make the definition of MCONTEXT_FPREGS_MEM and UCONTEXT_FPREGS_MEM_OFFSET
conditional on whether we are building for Android.

On glibc and musl, signal.h and asm/sigcontext.h can't be included
together, so in breakpad_context_unittest.cc, only compare the libc
and kernel _fpstate when on Android.

Bug: google-breakpad:631
Change-Id: If81d73c4101bae946e9a3655b8d1c40a34ab6c38
Reviewed-on: https://chromium-review.googlesource.com/c/breakpad/breakpad/+/2102135
Reviewed-by: Mike Frysinger <vapier@chromium.org>

1 files changed, 0 insertions, 144 deletions

diff --git a/src/common/android/ucontext_constants.h b/src/common/android/ucontext_constants.h
deleted file mode 100644
index 1932d573..00000000
--- a/src/common/android/ucontext_constants.h
+++ /dev/null
@@ -1,144 +0,0 @@
-// Copyright (c) 2012, Google Inc.
-// 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.
-//     * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// 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.
-
-// This header can be included either from a C, C++ or Assembly file.
-// Its purpose is to contain constants that must match the offsets of
-// various fields in ucontext_t.
-//
-// They should match the definitions from
-// src/common/android/include/sys/ucontext.h
-//
-// Used by src/common/android/breakpad_getcontext.S
-// Tested by src/common/android/testing/breakpad_getcontext_unittest.cc
-
-#ifndef GOOGLEBREAKPAD_COMMON_ANDROID_UCONTEXT_CONSTANTS_H
-#define GOOGLEBREAKPAD_COMMON_ANDROID_UCONTEXT_CONSTANTS_H
-
-#if defined(__arm__)
-
-#define  MCONTEXT_GREGS_OFFSET     32
-#define  UCONTEXT_SIGMASK_OFFSET   104
-
-#elif defined(__aarch64__)
-
-#define  UCONTEXT_SIGMASK_OFFSET     40
-
-#define  MCONTEXT_GREGS_OFFSET       184
-#define  MCONTEXT_SP_OFFSET          432
-#define  MCONTEXT_PC_OFFSET          440
-#define  MCONTEXT_PSTATE_OFFSET      448
-#define  MCONTEXT_EXTENSION_OFFSET   464
-
-#define  FPSIMD_MAGIC                0x46508001
-
-#define  FPSIMD_CONTEXT_MAGIC_OFFSET 0
-#define  FPSIMD_CONTEXT_SIZE_OFFSET  4
-#define  FPSIMD_CONTEXT_FPSR_OFFSET  8
-#define  FPSIMD_CONTEXT_FPCR_OFFSET  12
-#define  FPSIMD_CONTEXT_VREGS_OFFSET 16
-#define  FPSIMD_CONTEXT_SIZE         528
-
-#define  REGISTER_SIZE               8
-#define  SIMD_REGISTER_SIZE          16
-
-#elif defined(__i386__)
-
-#define  MCONTEXT_GREGS_OFFSET     20
-#define  MCONTEXT_GS_OFFSET        (MCONTEXT_GREGS_OFFSET + 0*4)
-#define  MCONTEXT_FS_OFFSET        (MCONTEXT_GREGS_OFFSET + 1*4)
-#define  MCONTEXT_ES_OFFSET        (MCONTEXT_GREGS_OFFSET + 2*4)
-#define  MCONTEXT_DS_OFFSET        (MCONTEXT_GREGS_OFFSET + 3*4)
-#define  MCONTEXT_EDI_OFFSET       (MCONTEXT_GREGS_OFFSET + 4*4)
-#define  MCONTEXT_ESI_OFFSET       (MCONTEXT_GREGS_OFFSET + 5*4)
-#define  MCONTEXT_EBP_OFFSET       (MCONTEXT_GREGS_OFFSET + 6*4)
-#define  MCONTEXT_ESP_OFFSET       (MCONTEXT_GREGS_OFFSET + 7*4)
-#define  MCONTEXT_EBX_OFFSET       (MCONTEXT_GREGS_OFFSET + 8*4)
-#define  MCONTEXT_EDX_OFFSET       (MCONTEXT_GREGS_OFFSET + 9*4)
-#define  MCONTEXT_ECX_OFFSET       (MCONTEXT_GREGS_OFFSET + 10*4)
-#define  MCONTEXT_EAX_OFFSET       (MCONTEXT_GREGS_OFFSET + 11*4)
-#define  MCONTEXT_TRAPNO_OFFSET    (MCONTEXT_GREGS_OFFSET + 12*4)
-#define  MCONTEXT_ERR_OFFSET       (MCONTEXT_GREGS_OFFSET + 13*4)
-#define  MCONTEXT_EIP_OFFSET       (MCONTEXT_GREGS_OFFSET + 14*4)
-#define  MCONTEXT_CS_OFFSET        (MCONTEXT_GREGS_OFFSET + 15*4)
-#define  MCONTEXT_EFL_OFFSET       (MCONTEXT_GREGS_OFFSET + 16*4)
-#define  MCONTEXT_UESP_OFFSET      (MCONTEXT_GREGS_OFFSET + 17*4)
-#define  MCONTEXT_SS_OFFSET        (MCONTEXT_GREGS_OFFSET + 18*4)
-
-#define  UCONTEXT_SIGMASK_OFFSET   108
-
-#define  UCONTEXT_FPREGS_OFFSET       96
-#define  UCONTEXT_FPREGS_MEM_OFFSET   116
-
-#elif defined(__mips__)
-
-#if _MIPS_SIM == _ABIO32
-#define  MCONTEXT_PC_OFFSET        32
-#define  MCONTEXT_GREGS_OFFSET     40
-#define  MCONTEXT_FPREGS_OFFSET    296
-#define  MCONTEXT_FPC_CSR          556
-#define  UCONTEXT_SIGMASK_OFFSET   616
-#else
-#define  MCONTEXT_GREGS_OFFSET     40
-#define  MCONTEXT_FPREGS_OFFSET    296
-#define  MCONTEXT_PC_OFFSET        616
-#define  MCONTEXT_FPC_CSR          624
-#define  UCONTEXT_SIGMASK_OFFSET   640
-#endif
-
-#elif defined(__x86_64__)
-
-#define MCONTEXT_GREGS_OFFSET     40
-#define UCONTEXT_SIGMASK_OFFSET   296
-
-#define MCONTEXT_GREGS_R8    40
-#define MCONTEXT_GREGS_R9    48
-#define MCONTEXT_GREGS_R10   56
-#define MCONTEXT_GREGS_R11   64
-#define MCONTEXT_GREGS_R12   72
-#define MCONTEXT_GREGS_R13   80
-#define MCONTEXT_GREGS_R14   88
-#define MCONTEXT_GREGS_R15   96
-#define MCONTEXT_GREGS_RDI   104
-#define MCONTEXT_GREGS_RSI   112
-#define MCONTEXT_GREGS_RBP   120
-#define MCONTEXT_GREGS_RBX   128
-#define MCONTEXT_GREGS_RDX   136
-#define MCONTEXT_GREGS_RAX   144
-#define MCONTEXT_GREGS_RCX   152
-#define MCONTEXT_GREGS_RSP   160
-#define MCONTEXT_GREGS_RIP   168
-#define MCONTEXT_FPREGS_PTR  224
-#define MCONTEXT_FPREGS_MEM  304
-#define FPREGS_OFFSET_MXCSR  24
-
-#else
-#error "This header has not been ported for your CPU"
-#endif
-
-#endif  // GOOGLEBREAKPAD_COMMON_ANDROID_UCONTEXT_CONSTANTS_H