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>

4 files changed, 0 insertions, 872 deletions

diff --git a/src/common/android/breakpad_getcontext.S b/src/common/android/breakpad_getcontext.S
deleted file mode 100644
index 7f3a3b6f..00000000
--- a/src/common/android/breakpad_getcontext.S
+++ /dev/null
@@ -1,486 +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.
-
-// A minimalistic implementation of getcontext() to be used by
-// Google Breakpad on Android.
-
-#include "common/android/ucontext_constants.h"
-
-/* int getcontext (ucontext_t *ucp) */
-
-#if defined(__arm__)
-
-  .text
-  .global breakpad_getcontext
-  .hidden breakpad_getcontext
-  .type breakpad_getcontext, #function
-  .align 0
-  .fnstart
-breakpad_getcontext:
-
-  /* First, save r4-r11 */
-  add   r1, r0, #(MCONTEXT_GREGS_OFFSET + 4*4)
-  stm   r1, {r4-r11}
-
-  /* r12 is a scratch register, don't save it */
-
-  /* Save sp and lr explicitly. */
-  /* - sp can't be stored with stmia in Thumb-2 */
-  /* - STM instructions that store sp and pc are deprecated in ARM */
-  str   sp, [r0, #(MCONTEXT_GREGS_OFFSET + 13*4)]
-  str   lr, [r0, #(MCONTEXT_GREGS_OFFSET + 14*4)]
-
-  /* Save the caller's address in 'pc' */
-  str   lr, [r0, #(MCONTEXT_GREGS_OFFSET + 15*4)]
-
-  /* Save ucontext_t* pointer across next call */
-  mov   r4, r0
-
-  /* Call sigprocmask(SIG_BLOCK, NULL, &(ucontext->uc_sigmask)) */
-  mov   r0, #0  /* SIG_BLOCK */
-  mov   r1, #0  /* NULL */
-  add   r2, r4, #UCONTEXT_SIGMASK_OFFSET
-  bl    sigprocmask(PLT)
-
-  /* Intentionally do not save the FPU state here. This is because on
-   * Linux/ARM, one should instead use ptrace(PTRACE_GETFPREGS) or
-   * ptrace(PTRACE_GETVFPREGS) to get it.
-   *
-   * Note that a real implementation of getcontext() would need to save
-   * this here to allow setcontext()/swapcontext() to work correctly.
-   */
-
-  /* Restore the values of r4 and lr */
-  mov   r0, r4
-  ldr   lr, [r0, #(MCONTEXT_GREGS_OFFSET + 14*4)]
-  ldr   r4, [r0, #(MCONTEXT_GREGS_OFFSET +  4*4)]
-
-  /* Return 0 */
-  mov   r0, #0
-  bx    lr
-
-  .fnend
-  .size breakpad_getcontext, . - breakpad_getcontext
-
-#elif defined(__aarch64__)
-
-#define  _NSIG                       64
-#define  __NR_rt_sigprocmask         135
-
-  .text
-  .global breakpad_getcontext
-  .hidden breakpad_getcontext
-  .type breakpad_getcontext, #function
-  .align 4
-  .cfi_startproc
-breakpad_getcontext:
-
-  /* The saved context will return to the getcontext() call point
-     with a return value of 0 */
-  str     xzr,      [x0, MCONTEXT_GREGS_OFFSET +  0 * REGISTER_SIZE]
-
-  stp     x18, x19, [x0, MCONTEXT_GREGS_OFFSET + 18 * REGISTER_SIZE]
-  stp     x20, x21, [x0, MCONTEXT_GREGS_OFFSET + 20 * REGISTER_SIZE]
-  stp     x22, x23, [x0, MCONTEXT_GREGS_OFFSET + 22 * REGISTER_SIZE]
-  stp     x24, x25, [x0, MCONTEXT_GREGS_OFFSET + 24 * REGISTER_SIZE]
-  stp     x26, x27, [x0, MCONTEXT_GREGS_OFFSET + 26 * REGISTER_SIZE]
-  stp     x28, x29, [x0, MCONTEXT_GREGS_OFFSET + 28 * REGISTER_SIZE]
-  str     x30,      [x0, MCONTEXT_GREGS_OFFSET + 30 * REGISTER_SIZE]
-
-  /* Place LR into the saved PC, this will ensure that when
-     switching to this saved context with setcontext() control
-     will pass back to the caller of getcontext(), we have
-     already arranged to return the appropriate return value in x0
-     above.  */
-  str     x30, [x0, MCONTEXT_PC_OFFSET]
-
-  /* Save the current SP */
-  mov     x2, sp
-  str     x2, [x0, MCONTEXT_SP_OFFSET]
-
-  /* Initialize the pstate.  */
-  str     xzr, [x0, MCONTEXT_PSTATE_OFFSET]
-
-  /* Figure out where to place the first context extension
-     block.  */
-  add     x2, x0, #MCONTEXT_EXTENSION_OFFSET
-
-  /* Write the context extension fpsimd header.  */
-  mov     w3, #(FPSIMD_MAGIC & 0xffff)
-  movk    w3, #(FPSIMD_MAGIC >> 16), lsl #16
-  str     w3, [x2, #FPSIMD_CONTEXT_MAGIC_OFFSET]
-  mov     w3, #FPSIMD_CONTEXT_SIZE
-  str     w3, [x2, #FPSIMD_CONTEXT_SIZE_OFFSET]
-
-  /* Fill in the FP SIMD context.  */
-  add     x3, x2, #(FPSIMD_CONTEXT_VREGS_OFFSET + 8 * SIMD_REGISTER_SIZE)
-  stp     d8,  d9, [x3], #(2 * SIMD_REGISTER_SIZE)
-  stp     d10, d11, [x3], #(2 * SIMD_REGISTER_SIZE)
-  stp     d12, d13, [x3], #(2 * SIMD_REGISTER_SIZE)
-  stp     d14, d15, [x3], #(2 * SIMD_REGISTER_SIZE)
-
-  add     x3, x2, FPSIMD_CONTEXT_FPSR_OFFSET
-
-  mrs     x4, fpsr
-  str     w4, [x3]
-
-  mrs     x4, fpcr
-  str     w4, [x3, FPSIMD_CONTEXT_FPCR_OFFSET - FPSIMD_CONTEXT_FPSR_OFFSET]
-
-  /* Write the termination context extension header.  */
-  add     x2, x2, #FPSIMD_CONTEXT_SIZE
-
-  str     xzr, [x2, #FPSIMD_CONTEXT_MAGIC_OFFSET]
-  str     xzr, [x2, #FPSIMD_CONTEXT_SIZE_OFFSET]
-
-  /* Grab the signal mask */
-  /* rt_sigprocmask (SIG_BLOCK, NULL, &ucp->uc_sigmask, _NSIG8) */
-  add     x2, x0, #UCONTEXT_SIGMASK_OFFSET
-  mov     x0, #0  /* SIG_BLOCK */
-  mov     x1, #0  /* NULL */
-  mov     x3, #(_NSIG / 8)
-  mov     x8, #__NR_rt_sigprocmask
-  svc     0
-
-  /* Return x0 for success */
-  mov     x0, 0
-  ret
-
-  .cfi_endproc
-  .size breakpad_getcontext, . - breakpad_getcontext
-
-#elif defined(__i386__)
-
-  .text
-  .global breakpad_getcontext
-  .hidden breakpad_getcontext
-  .align 4
-  .type breakpad_getcontext, @function
-
-breakpad_getcontext:
-
-  movl 4(%esp), %eax   /* eax = uc */
-
-  /* Save register values */
-  movl %ecx, MCONTEXT_ECX_OFFSET(%eax)
-  movl %edx, MCONTEXT_EDX_OFFSET(%eax)
-  movl %ebx, MCONTEXT_EBX_OFFSET(%eax)
-  movl %edi, MCONTEXT_EDI_OFFSET(%eax)
-  movl %esi, MCONTEXT_ESI_OFFSET(%eax)
-  movl %ebp, MCONTEXT_EBP_OFFSET(%eax)
-
-  movl (%esp), %edx   /* return address */
-  lea  4(%esp), %ecx  /* exclude return address from stack */
-  mov  %edx, MCONTEXT_EIP_OFFSET(%eax)
-  mov  %ecx, MCONTEXT_ESP_OFFSET(%eax)
-
-  xorl %ecx, %ecx
-  movw %fs, %cx
-  mov  %ecx, MCONTEXT_FS_OFFSET(%eax)
-
-  movl $0, MCONTEXT_EAX_OFFSET(%eax)
-
-  /* Save floating point state to fpregstate, then update
-   * the fpregs pointer to point to it */
-  leal UCONTEXT_FPREGS_MEM_OFFSET(%eax), %ecx
-  fnstenv (%ecx)
-  fldenv  (%ecx)
-  mov %ecx, UCONTEXT_FPREGS_OFFSET(%eax)
-
-  /* Save signal mask: sigprocmask(SIGBLOCK, NULL, &uc->uc_sigmask) */
-  leal UCONTEXT_SIGMASK_OFFSET(%eax), %edx
-  xorl %ecx, %ecx
-  push %edx   /* &uc->uc_sigmask */
-  push %ecx   /* NULL */
-  push %ecx   /* SIGBLOCK == 0 on i386 */
-  call sigprocmask@PLT
-  addl $12, %esp
-
-  movl $0, %eax
-  ret
-
-  .size breakpad_getcontext, . - breakpad_getcontext
-
-#elif defined(__mips__)
-
-// This implementation is inspired by implementation of getcontext in glibc.
-#include <asm-mips/asm.h>
-#include <asm-mips/regdef.h>
-#if _MIPS_SIM == _ABIO32
-#include <asm-mips/fpregdef.h>
-#endif
-
-// from asm-mips/asm.h
-#if _MIPS_SIM == _ABIO32
-#define ALSZ 7
-#define ALMASK ~7
-#define SZREG 4
-#else // _MIPS_SIM != _ABIO32
-#define ALSZ 15
-#define ALMASK ~15
-#define SZREG 8
-#endif
-
-#include <asm/unistd.h> // for __NR_rt_sigprocmask
-
-#define _NSIG8 128 / 8
-#define SIG_BLOCK 1
-
-
-  .text
-LOCALS_NUM = 1 // save gp on stack
-FRAME_SIZE = ((LOCALS_NUM * SZREG) + ALSZ) & ALMASK
-
-GP_FRAME_OFFSET = FRAME_SIZE - (1 * SZREG)
-MCONTEXT_REG_SIZE = 8
-
-#if _MIPS_SIM == _ABIO32
-
-NESTED (breakpad_getcontext, FRAME_SIZE, ra)
-  .mask	0x00000000, 0
-  .fmask 0x00000000, 0
-
-  .set noreorder
-  .cpload t9
-  .set reorder
-
-  move a2, sp
-#define _SP a2
-
-  addiu sp, -FRAME_SIZE
-  .cprestore GP_FRAME_OFFSET
-
-  sw s0, (16 * MCONTEXT_REG_SIZE + MCONTEXT_GREGS_OFFSET)(a0)
-  sw s1, (17 * MCONTEXT_REG_SIZE + MCONTEXT_GREGS_OFFSET)(a0)
-  sw s2, (18 * MCONTEXT_REG_SIZE + MCONTEXT_GREGS_OFFSET)(a0)
-  sw s3, (19 * MCONTEXT_REG_SIZE + MCONTEXT_GREGS_OFFSET)(a0)
-  sw s4, (20 * MCONTEXT_REG_SIZE + MCONTEXT_GREGS_OFFSET)(a0)
-  sw s5, (21 * MCONTEXT_REG_SIZE + MCONTEXT_GREGS_OFFSET)(a0)
-  sw s6, (22 * MCONTEXT_REG_SIZE + MCONTEXT_GREGS_OFFSET)(a0)
-  sw s7, (23 * MCONTEXT_REG_SIZE + MCONTEXT_GREGS_OFFSET)(a0)
-  sw _SP, (29 * MCONTEXT_REG_SIZE + MCONTEXT_GREGS_OFFSET)(a0)
-  sw fp, (30 * MCONTEXT_REG_SIZE + MCONTEXT_GREGS_OFFSET)(a0)
-  sw ra, (31 * MCONTEXT_REG_SIZE + MCONTEXT_GREGS_OFFSET)(a0)
-  sw ra, MCONTEXT_PC_OFFSET(a0)
-
-#ifdef __mips_hard_float
-  s.d fs0, (20 * MCONTEXT_REG_SIZE + MCONTEXT_FPREGS_OFFSET)(a0)
-  s.d fs1, (22 * MCONTEXT_REG_SIZE + MCONTEXT_FPREGS_OFFSET)(a0)
-  s.d fs2, (24 * MCONTEXT_REG_SIZE + MCONTEXT_FPREGS_OFFSET)(a0)
-  s.d fs3, (26 * MCONTEXT_REG_SIZE + MCONTEXT_FPREGS_OFFSET)(a0)
-  s.d fs4, (28 * MCONTEXT_REG_SIZE + MCONTEXT_FPREGS_OFFSET)(a0)
-  s.d fs5, (30 * MCONTEXT_REG_SIZE + MCONTEXT_FPREGS_OFFSET)(a0)
-
-  cfc1 v1, fcr31
-  sw v1, MCONTEXT_FPC_CSR(a0)
-#endif  // __mips_hard_float
-
-  /* rt_sigprocmask (SIG_BLOCK, NULL, &ucp->uc_sigmask, _NSIG8) */
-  li a3, _NSIG8
-  addu a2, a0, UCONTEXT_SIGMASK_OFFSET
-  move a1, zero
-  li a0, SIG_BLOCK
-  li v0, __NR_rt_sigprocmask
-  syscall
-
-  addiu sp, FRAME_SIZE
-  jr ra
-
-END (breakpad_getcontext)
-#else
-
-#ifndef NESTED
-/*
- * NESTED - declare nested routine entry point
- */
-#define NESTED(symbol, framesize, rpc)  \
-    .globl  symbol;                     \
-    .align  2;                          \
-    .type symbol,@function;             \
-    .ent  symbol,0;                     \
-symbol:   .frame  sp, framesize, rpc;
-#endif
-
-/*
- * END - mark end of function
- */
-#ifndef END
-# define END(function)                  \
-    .end  function;                     \
-    .size function,.-function
-#endif
-
-/* int getcontext (ucontext_t *ucp) */
-
-NESTED (breakpad_getcontext, FRAME_SIZE, ra)
-  .mask   0x10000000, 0
-  .fmask  0x00000000, 0
-
-  move  a2, sp
-#define _SP a2
-  move  a3, gp
-#define _GP a3
-
-  daddiu sp, -FRAME_SIZE
-  .cpsetup $25, GP_FRAME_OFFSET, breakpad_getcontext
-
-  /* Store a magic flag.  */
-  li  v1, 1
-  sd v1, (0 * MCONTEXT_REG_SIZE + MCONTEXT_GREGS_OFFSET)(a0)  /* zero */
-
-  sd s0, (16 * MCONTEXT_REG_SIZE + MCONTEXT_GREGS_OFFSET)(a0)
-  sd s1, (17 * MCONTEXT_REG_SIZE + MCONTEXT_GREGS_OFFSET)(a0)
-  sd s2, (18 * MCONTEXT_REG_SIZE + MCONTEXT_GREGS_OFFSET)(a0)
-  sd s3, (19 * MCONTEXT_REG_SIZE + MCONTEXT_GREGS_OFFSET)(a0)
-  sd s4, (20 * MCONTEXT_REG_SIZE + MCONTEXT_GREGS_OFFSET)(a0)
-  sd s5, (21 * MCONTEXT_REG_SIZE + MCONTEXT_GREGS_OFFSET)(a0)
-  sd s6, (22 * MCONTEXT_REG_SIZE + MCONTEXT_GREGS_OFFSET)(a0)
-  sd s7, (23 * MCONTEXT_REG_SIZE + MCONTEXT_GREGS_OFFSET)(a0)
-  sd _GP, (28 * MCONTEXT_REG_SIZE + MCONTEXT_GREGS_OFFSET)(a0)
-  sd _SP, (29 * MCONTEXT_REG_SIZE + MCONTEXT_GREGS_OFFSET)(a0)
-  sd s8, (30 * MCONTEXT_REG_SIZE + MCONTEXT_GREGS_OFFSET)(a0)
-  sd ra, (31 * MCONTEXT_REG_SIZE + MCONTEXT_GREGS_OFFSET)(a0)
-  sd ra, MCONTEXT_PC_OFFSET(a0)
-
-#ifdef __mips_hard_float
-  s.d $f24, (24 * MCONTEXT_REG_SIZE + MCONTEXT_FPREGS_OFFSET)(a0)
-  s.d $f25, (25 * MCONTEXT_REG_SIZE + MCONTEXT_FPREGS_OFFSET)(a0)
-  s.d $f26, (26 * MCONTEXT_REG_SIZE + MCONTEXT_FPREGS_OFFSET)(a0)
-  s.d $f27, (27 * MCONTEXT_REG_SIZE + MCONTEXT_FPREGS_OFFSET)(a0)
-  s.d $f28, (28 * MCONTEXT_REG_SIZE + MCONTEXT_FPREGS_OFFSET)(a0)
-  s.d $f29, (29 * MCONTEXT_REG_SIZE + MCONTEXT_FPREGS_OFFSET)(a0)
-  s.d $f30, (30 * MCONTEXT_REG_SIZE + MCONTEXT_FPREGS_OFFSET)(a0)
-  s.d $f31, (31 * MCONTEXT_REG_SIZE + MCONTEXT_FPREGS_OFFSET)(a0)
-
-  cfc1  v1, $31
-  sw  v1, MCONTEXT_FPC_CSR(a0)
-#endif /* __mips_hard_float */
-
-/* rt_sigprocmask (SIG_BLOCK, NULL, &ucp->uc_sigmask, _NSIG8) */
-  li  a3, _NSIG8
-  daddu a2, a0, UCONTEXT_SIGMASK_OFFSET
-  move  a1, zero
-  li  a0, SIG_BLOCK
-
-  li  v0, __NR_rt_sigprocmask
-  syscall
-
-  .cpreturn
-  daddiu sp, FRAME_SIZE
-  move  v0, zero
-  jr  ra
-
-END (breakpad_getcontext)
-#endif // _MIPS_SIM == _ABIO32
-
-#elif defined(__x86_64__)
-/* The x64 implementation of breakpad_getcontext was derived in part
-   from the implementation of libunwind which requires the following
-   notice. */
-/* libunwind - a platform-independent unwind library
-   Copyright (C) 2008 Google, Inc
-	Contributed by Paul Pluzhnikov <ppluzhnikov@google.com>
-   Copyright (C) 2010 Konstantin Belousov <kib@freebsd.org>
-
-This file is part of libunwind.
-
-Permission is hereby granted, free of charge, to any person obtaining
-a copy of this software and associated documentation files (the
-"Software"), to deal in the Software without restriction, including
-without limitation the rights to use, copy, modify, merge, publish,
-distribute, sublicense, and/or sell copies of the Software, and to
-permit persons to whom the Software is furnished to do so, subject to
-the following conditions:
-
-The above copyright notice and this permission notice shall be
-included in all copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
-EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
-MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
-NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
-LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
-OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
-WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.  */
-
-  .text
-  .global breakpad_getcontext
-  .hidden breakpad_getcontext
-  .align 4
-  .type breakpad_getcontext, @function
-
-breakpad_getcontext:
-  .cfi_startproc
-
-  /* Callee saved: RBX, RBP, R12-R15  */
-  movq %r12, MCONTEXT_GREGS_R12(%rdi)
-  movq %r13, MCONTEXT_GREGS_R13(%rdi)
-  movq %r14, MCONTEXT_GREGS_R14(%rdi)
-  movq %r15, MCONTEXT_GREGS_R15(%rdi)
-  movq %rbp, MCONTEXT_GREGS_RBP(%rdi)
-  movq %rbx, MCONTEXT_GREGS_RBX(%rdi)
-
-  /* Save argument registers (not strictly needed, but setcontext
-     restores them, so don't restore garbage).  */
-  movq %r8,  MCONTEXT_GREGS_R8(%rdi)
-  movq %r9,  MCONTEXT_GREGS_R9(%rdi)
-  movq %rdi, MCONTEXT_GREGS_RDI(%rdi)
-  movq %rsi, MCONTEXT_GREGS_RSI(%rdi)
-  movq %rdx, MCONTEXT_GREGS_RDX(%rdi)
-  movq %rax, MCONTEXT_GREGS_RAX(%rdi)
-  movq %rcx, MCONTEXT_GREGS_RCX(%rdi)
-
-  /* Save fp state (not needed, except for setcontext not
-     restoring garbage).  */
-  leaq MCONTEXT_FPREGS_MEM(%rdi),%r8
-  movq %r8, MCONTEXT_FPREGS_PTR(%rdi)
-  fnstenv (%r8)
-  stmxcsr FPREGS_OFFSET_MXCSR(%r8)
-
-  leaq 8(%rsp), %rax /* exclude this call.  */
-  movq %rax, MCONTEXT_GREGS_RSP(%rdi)
-
-  movq 0(%rsp), %rax
-  movq %rax, MCONTEXT_GREGS_RIP(%rdi)
-
-  /* Save signal mask: sigprocmask(SIGBLOCK, NULL, &uc->uc_sigmask) */
-  leaq UCONTEXT_SIGMASK_OFFSET(%rdi), %rdx  // arg3
-  xorq %rsi, %rsi  // arg2 NULL
-  xorq %rdi, %rdi  // arg1 SIGBLOCK == 0
-  call sigprocmask@PLT
-
-  /* Always return 0 for success, even if sigprocmask failed. */
-  xorl %eax, %eax
-  ret
-  .cfi_endproc
-  .size breakpad_getcontext, . - breakpad_getcontext
-
-#else
-#error "This file has not been ported for your CPU!"
-#endif
diff --git a/src/common/android/breakpad_getcontext_unittest.cc b/src/common/android/breakpad_getcontext_unittest.cc
deleted file mode 100644
index 2c550bf2..00000000
--- a/src/common/android/breakpad_getcontext_unittest.cc
+++ /dev/null
@@ -1,186 +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.
-
-#if defined(__x86_64__)
-#include <asm/sigcontext.h>
-#endif
-
-#include <sys/ucontext.h>
-
-#include "breakpad_googletest_includes.h"
-#include "common/android/ucontext_constants.h"
-
-template <int left, int right>
-struct CompileAssertEquals {
-  // a compilation error here indicates left and right are not equal.
-  char left_too_large[right - left];
-  // a compilation error here indicates left and right are not equal.
-  char right_too_large[left - right];
-};
-
-#define COMPILE_ASSERT_EQ(left, right, tag) \
-  CompileAssertEquals<left, right> tag;
-
-TEST(AndroidUContext, GRegsOffset) {
-#if defined(__arm__)
-  // There is no gregs[] array on ARM, so compare to the offset of
-  // first register fields, since they're stored in order.
-  ASSERT_EQ(static_cast<size_t>(MCONTEXT_GREGS_OFFSET),
-            offsetof(ucontext_t,uc_mcontext.arm_r0));
-#elif defined(__aarch64__)
-  // There is no gregs[] array on ARM, so compare to the offset of
-  // first register fields, since they're stored in order.
-  ASSERT_EQ(static_cast<size_t>(MCONTEXT_GREGS_OFFSET),
-            offsetof(ucontext_t,uc_mcontext.regs[0]));
-  ASSERT_EQ(static_cast<size_t>(MCONTEXT_SP_OFFSET),
-            offsetof(ucontext_t,uc_mcontext.sp));
-  ASSERT_EQ(static_cast<size_t>(MCONTEXT_PC_OFFSET),
-            offsetof(ucontext_t,uc_mcontext.pc));
-  ASSERT_EQ(static_cast<size_t>(MCONTEXT_PSTATE_OFFSET),
-            offsetof(ucontext_t,uc_mcontext.pstate));
-  ASSERT_EQ(static_cast<size_t>(MCONTEXT_EXTENSION_OFFSET),
-            offsetof(ucontext_t,uc_mcontext.__reserved));
-#elif defined(__i386__)
-  ASSERT_EQ(static_cast<size_t>(MCONTEXT_GREGS_OFFSET),
-            offsetof(ucontext_t,uc_mcontext.gregs));
-#define CHECK_REG(x) \
-  ASSERT_EQ(static_cast<size_t>(MCONTEXT_##x##_OFFSET),         \
-            offsetof(ucontext_t,uc_mcontext.gregs[REG_##x]))
-  CHECK_REG(GS);
-  CHECK_REG(FS);
-  CHECK_REG(ES);
-  CHECK_REG(DS);
-  CHECK_REG(EDI);
-  CHECK_REG(ESI);
-  CHECK_REG(EBP);
-  CHECK_REG(ESP);
-  CHECK_REG(EBX);
-  CHECK_REG(EDX);
-  CHECK_REG(ECX);
-  CHECK_REG(EAX);
-  CHECK_REG(TRAPNO);
-  CHECK_REG(ERR);
-  CHECK_REG(EIP);
-  CHECK_REG(CS);
-  CHECK_REG(EFL);
-  CHECK_REG(UESP);
-  CHECK_REG(SS);
-
-  ASSERT_EQ(static_cast<size_t>(UCONTEXT_FPREGS_OFFSET),
-            offsetof(ucontext_t,uc_mcontext.fpregs));
-
-  ASSERT_EQ(static_cast<size_t>(UCONTEXT_FPREGS_MEM_OFFSET),
-            offsetof(ucontext_t,__fpregs_mem));
-#elif defined(__mips__)
-  ASSERT_EQ(static_cast<size_t>(MCONTEXT_GREGS_OFFSET),
-            offsetof(ucontext_t,uc_mcontext.gregs));
-
-  // PC for mips is not part of gregs.
-  ASSERT_EQ(static_cast<size_t>(MCONTEXT_PC_OFFSET),
-            offsetof(ucontext_t,uc_mcontext.pc));
-
-  ASSERT_EQ(static_cast<size_t>(MCONTEXT_FPREGS_OFFSET),
-            offsetof(ucontext_t,uc_mcontext.fpregs));
-
-  ASSERT_EQ(static_cast<size_t>(MCONTEXT_FPC_CSR),
-            offsetof(ucontext_t,uc_mcontext.fpc_csr));
-#elif defined(__x86_64__)
-
-  COMPILE_ASSERT_EQ(static_cast<size_t>(MCONTEXT_GREGS_OFFSET),
-                    offsetof(ucontext_t,uc_mcontext.gregs),
-                    mcontext_gregs_offset);
-#define CHECK_REG(x) \
-  COMPILE_ASSERT_EQ(static_cast<size_t>(MCONTEXT_GREGS_##x), \
-                    offsetof(ucontext_t,uc_mcontext.gregs[REG_##x]), reg_##x)
-  CHECK_REG(R8);
-  CHECK_REG(R9);
-  CHECK_REG(R10);
-  CHECK_REG(R11);
-  CHECK_REG(R12);
-  CHECK_REG(R13);
-  CHECK_REG(R14);
-  CHECK_REG(R15);
-  CHECK_REG(RDI);
-  CHECK_REG(RSI);
-  CHECK_REG(RBP);
-  CHECK_REG(RBX);
-  CHECK_REG(RDX);
-  CHECK_REG(RAX);
-  CHECK_REG(RCX);
-  CHECK_REG(RSP);
-  CHECK_REG(RIP);
-
-  // sigcontext is an analog to mcontext_t. The layout should be the same.
-  COMPILE_ASSERT_EQ(offsetof(mcontext_t,fpregs),
-                    offsetof(sigcontext,fpstate), sigcontext_fpstate);
-  // Check that _fpstate from asm/sigcontext.h is essentially the same
-  // as _libc_fpstate.
-  COMPILE_ASSERT_EQ(sizeof(_libc_fpstate), sizeof(_fpstate),
-                    sigcontext_fpstate_size);
-  COMPILE_ASSERT_EQ(offsetof(_libc_fpstate,cwd),offsetof(_fpstate,cwd),
-                    sigcontext_fpstate_cwd);
-  COMPILE_ASSERT_EQ(offsetof(_libc_fpstate,swd),offsetof(_fpstate,swd),
-                    sigcontext_fpstate_swd);
-  COMPILE_ASSERT_EQ(offsetof(_libc_fpstate,ftw),offsetof(_fpstate,twd),
-                    sigcontext_fpstate_twd);
-  COMPILE_ASSERT_EQ(offsetof(_libc_fpstate,fop),offsetof(_fpstate,fop),
-                    sigcontext_fpstate_fop);
-  COMPILE_ASSERT_EQ(offsetof(_libc_fpstate,rip),offsetof(_fpstate,rip),
-                    sigcontext_fpstate_rip);
-  COMPILE_ASSERT_EQ(offsetof(_libc_fpstate,rdp),offsetof(_fpstate,rdp),
-                    sigcontext_fpstate_rdp);
-  COMPILE_ASSERT_EQ(offsetof(_libc_fpstate,mxcsr),offsetof(_fpstate,mxcsr),
-                    sigcontext_fpstate_mxcsr);
-  COMPILE_ASSERT_EQ(offsetof(_libc_fpstate,mxcr_mask),
-                    offsetof(_fpstate,mxcsr_mask),
-                    sigcontext_fpstate_mxcsr_mask);
-  COMPILE_ASSERT_EQ(offsetof(_libc_fpstate,_st), offsetof(_fpstate,st_space),
-                    sigcontext_fpstate_stspace);
-  COMPILE_ASSERT_EQ(offsetof(_libc_fpstate,_xmm), offsetof(_fpstate,xmm_space),
-                    sigcontext_fpstate_xmm_space);
-
-  COMPILE_ASSERT_EQ(MCONTEXT_FPREGS_PTR,
-                    offsetof(ucontext_t,uc_mcontext.fpregs),
-                    mcontext_fpregs_ptr);
-  COMPILE_ASSERT_EQ(MCONTEXT_FPREGS_MEM, offsetof(ucontext_t,__fpregs_mem),
-                    mcontext_fpregs_mem);
-  COMPILE_ASSERT_EQ(FPREGS_OFFSET_MXCSR, offsetof(_libc_fpstate,mxcsr),
-                    fpregs_offset_mxcsr);
-  COMPILE_ASSERT_EQ(UCONTEXT_SIGMASK_OFFSET, offsetof(ucontext_t, uc_sigmask),
-                    ucontext_sigmask);
-#else
-  ASSERT_EQ(static_cast<size_t>(MCONTEXT_GREGS_OFFSET),
-            offsetof(ucontext_t,uc_mcontext.gregs));
-#endif
-}
-
-TEST(AndroidUContext, SigmakOffset) {
-  ASSERT_EQ(static_cast<size_t>(UCONTEXT_SIGMASK_OFFSET),
-            offsetof(ucontext_t,uc_sigmask));
-}
diff --git a/src/common/android/include/ucontext.h b/src/common/android/include/ucontext.h
deleted file mode 100644
index 29db8ade..00000000
--- a/src/common/android/include/ucontext.h
+++ /dev/null
@@ -1,56 +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.
-
-#ifndef GOOGLE_BREAKPAD_COMMON_ANDROID_INCLUDE_UCONTEXT_H
-#define GOOGLE_BREAKPAD_COMMON_ANDROID_INCLUDE_UCONTEXT_H
-
-#include <sys/cdefs.h>
-
-#ifdef __BIONIC_UCONTEXT_H
-#include <ucontext.h>
-#else
-
-#include <sys/ucontext.h>
-
-#ifdef __cplusplus
-extern "C" {
-#endif  // __cplusplus
-
-// Provided by src/android/common/breakpad_getcontext.S
-int breakpad_getcontext(ucontext_t* ucp);
-
-#define getcontext(x)   breakpad_getcontext(x)
-
-#ifdef __cplusplus
-}  // extern "C"
-#endif  // __cplusplus
-
-#endif  // __BIONIC_UCONTEXT_H
-
-#endif  // GOOGLE_BREAKPAD_COMMON_ANDROID_INCLUDE_UCONTEXT_H
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