Add x64 version of getcontext.
Assembly code is derived in part from code in libunwind. Code tested on desktop linux (Android testing pending emulation support). BUG=346626 R=dannyb@google.com, thestig@chromium.org Review URL: https://breakpad.appspot.com/1454002 git-svn-id: http://google-breakpad.googlecode.com/svn/trunk@1311 4c0a9323-5329-0410-9bdc-e9ce6186880e
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rmcilroy@chromium.org
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5 changed files with 275 additions and 0 deletions
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@ -305,6 +305,87 @@ NESTED (breakpad_getcontext, FRAME_SIZE, ra)
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END (breakpad_getcontext)
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#elif defined(__x86_64__)
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/* The x64 implementation of breakpad_getcontext was derived in part
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from the implementation of libunwind which requires the following
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notice. */
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/* libunwind - a platform-independent unwind library
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Copyright (C) 2008 Google, Inc
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Contributed by Paul Pluzhnikov <ppluzhnikov@google.com>
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Copyright (C) 2010 Konstantin Belousov <kib@freebsd.org>
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This file is part of libunwind.
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Permission is hereby granted, free of charge, to any person obtaining
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a copy of this software and associated documentation files (the
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"Software"), to deal in the Software without restriction, including
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without limitation the rights to use, copy, modify, merge, publish,
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distribute, sublicense, and/or sell copies of the Software, and to
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permit persons to whom the Software is furnished to do so, subject to
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the following conditions:
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The above copyright notice and this permission notice shall be
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included in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
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.text
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.global breakpad_getcontext
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.hidden breakpad_getcontext
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.align 4
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.type breakpad_getcontext, @function
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breakpad_getcontext:
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.cfi_startproc
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/* Callee saved: RBX, RBP, R12-R15 */
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movq %r12, MCONTEXT_GREGS_R12(%rdi)
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movq %r13, MCONTEXT_GREGS_R13(%rdi)
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movq %r14, MCONTEXT_GREGS_R14(%rdi)
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movq %r15, MCONTEXT_GREGS_R15(%rdi)
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movq %rbp, MCONTEXT_GREGS_RBP(%rdi)
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movq %rbx, MCONTEXT_GREGS_RBX(%rdi)
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/* Save argument registers (not strictly needed, but setcontext
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restores them, so don't restore garbage). */
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movq %r8, MCONTEXT_GREGS_R8(%rdi)
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movq %r9, MCONTEXT_GREGS_R9(%rdi)
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movq %rdi, MCONTEXT_GREGS_RDI(%rdi)
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movq %rsi, MCONTEXT_GREGS_RSI(%rdi)
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movq %rdx, MCONTEXT_GREGS_RDX(%rdi)
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movq %rax, MCONTEXT_GREGS_RAX(%rdi)
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movq %rcx, MCONTEXT_GREGS_RCX(%rdi)
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/* Save fp state (not needed, except for setcontext not
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restoring garbage). */
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leaq MCONTEXT_FPREGS_MEM(%rdi),%r8
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movq %r8, MCONTEXT_FPREGS_PTR(%rdi)
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fnstenv (%r8)
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stmxcsr FPREGS_OFFSET_MXCSR(%r8)
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leaq 8(%rsp), %rax /* exclude this call. */
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movq %rax, MCONTEXT_GREGS_RSP(%rdi)
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movq 0(%rsp), %rax
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movq %rax, MCONTEXT_GREGS_RIP(%rdi)
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/* Save signal mask: sigprocmask(SIGBLOCK, NULL, &uc->uc_sigmask) */
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leaq UCONTEXT_SIGMASK_OFFSET(%rdi), %rdx // arg3
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xorq %rsi, %rsi // arg2 NULL
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xorq %rdi, %rdi // arg1 SIGBLOCK == 0
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call sigprocmask@PLT
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/* Always return 0 for success, even if sigprocmask failed. */
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xorl %eax, %eax
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ret
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.cfi_endproc
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.size breakpad_getcontext, . - breakpad_getcontext
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#else
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#error "This file has not been ported for your CPU!"
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@ -27,11 +27,26 @@
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#if defined(__x86_64__)
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#include <asm/sigcontext.h>
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#endif
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#include <sys/ucontext.h>
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#include "breakpad_googletest_includes.h"
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#include "common/android/ucontext_constants.h"
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template <int left, int right>
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struct CompileAssertEquals {
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// a compilation error here indicates left and right are not equal.
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char left_too_large[right - left];
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// a compilation error here indicates left and right are not equal.
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char right_too_large[left - right];
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};
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#define COMPILE_ASSERT_EQ(left, right, tag) \
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CompileAssertEquals<left, right> tag;
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TEST(AndroidUContext, GRegsOffset) {
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#if defined(__arm__)
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// There is no gregs[] array on ARM, so compare to the offset of
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@ -95,6 +110,70 @@ TEST(AndroidUContext, GRegsOffset) {
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ASSERT_EQ(static_cast<size_t>(MCONTEXT_FPC_CSR),
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offsetof(ucontext_t,uc_mcontext.fpc_csr));
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#elif defined(__x86_64__)
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COMPILE_ASSERT_EQ(static_cast<size_t>(MCONTEXT_GREGS_OFFSET),
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offsetof(ucontext_t,uc_mcontext.gregs),
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mcontext_gregs_offset);
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#define CHECK_REG(x) \
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COMPILE_ASSERT_EQ(static_cast<size_t>(MCONTEXT_GREGS_##x), \
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offsetof(ucontext_t,uc_mcontext.gregs[REG_##x]), reg_##x)
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CHECK_REG(R8);
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CHECK_REG(R9);
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CHECK_REG(R10);
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CHECK_REG(R11);
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CHECK_REG(R12);
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CHECK_REG(R13);
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CHECK_REG(R14);
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CHECK_REG(R15);
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CHECK_REG(RDI);
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CHECK_REG(RSI);
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CHECK_REG(RBP);
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CHECK_REG(RBX);
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CHECK_REG(RDX);
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CHECK_REG(RAX);
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CHECK_REG(RCX);
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CHECK_REG(RSP);
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CHECK_REG(RIP);
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// sigcontext is an analog to mcontext_t. The layout should be the same.
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COMPILE_ASSERT_EQ(offsetof(mcontext_t,fpregs),
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offsetof(sigcontext,fpstate), sigcontext_fpstate);
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// Check that _fpstate from asm/sigcontext.h is essentially the same
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// as _libc_fpstate.
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COMPILE_ASSERT_EQ(sizeof(_libc_fpstate), sizeof(_fpstate),
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sigcontext_fpstate_size);
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COMPILE_ASSERT_EQ(offsetof(_libc_fpstate,cwd),offsetof(_fpstate,cwd),
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sigcontext_fpstate_cwd);
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COMPILE_ASSERT_EQ(offsetof(_libc_fpstate,swd),offsetof(_fpstate,swd),
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sigcontext_fpstate_swd);
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COMPILE_ASSERT_EQ(offsetof(_libc_fpstate,ftw),offsetof(_fpstate,twd),
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sigcontext_fpstate_twd);
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COMPILE_ASSERT_EQ(offsetof(_libc_fpstate,fop),offsetof(_fpstate,fop),
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sigcontext_fpstate_fop);
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COMPILE_ASSERT_EQ(offsetof(_libc_fpstate,rip),offsetof(_fpstate,rip),
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sigcontext_fpstate_rip);
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COMPILE_ASSERT_EQ(offsetof(_libc_fpstate,rdp),offsetof(_fpstate,rdp),
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sigcontext_fpstate_rdp);
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COMPILE_ASSERT_EQ(offsetof(_libc_fpstate,mxcsr),offsetof(_fpstate,mxcsr),
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sigcontext_fpstate_mxcsr);
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COMPILE_ASSERT_EQ(offsetof(_libc_fpstate,mxcr_mask),
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offsetof(_fpstate,mxcsr_mask),
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sigcontext_fpstate_mxcsr_mask);
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COMPILE_ASSERT_EQ(offsetof(_libc_fpstate,_st), offsetof(_fpstate,st_space),
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sigcontext_fpstate_stspace);
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COMPILE_ASSERT_EQ(offsetof(_libc_fpstate,_xmm), offsetof(_fpstate,xmm_space),
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sigcontext_fpstate_xmm_space);
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COMPILE_ASSERT_EQ(MCONTEXT_FPREGS_PTR,
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offsetof(ucontext_t,uc_mcontext.fpregs),
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mcontext_fpregs_ptr);
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COMPILE_ASSERT_EQ(MCONTEXT_FPREGS_MEM, offsetof(ucontext_t,__fpregs_mem),
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mcontext_fpregs_mem);
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COMPILE_ASSERT_EQ(FPREGS_OFFSET_MXCSR, offsetof(_libc_fpstate,mxcsr),
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fpregs_offset_mxcsr);
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COMPILE_ASSERT_EQ(UCONTEXT_SIGMASK_OFFSET, offsetof(ucontext_t, uc_sigmask),
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ucontext_sigmask);
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#else
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ASSERT_EQ(static_cast<size_t>(MCONTEXT_GREGS_OFFSET),
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offsetof(ucontext_t,uc_mcontext.gregs));
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@ -175,6 +175,73 @@ typedef struct ucontext {
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// Other fields are not used by Google Breakpad. Don't define them.
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} ucontext_t;
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#elif defined(__x86_64__)
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enum {
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REG_R8 = 0,
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REG_R9,
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REG_R10,
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REG_R11,
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REG_R12,
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REG_R13,
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REG_R14,
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REG_R15,
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REG_RDI,
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REG_RSI,
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REG_RBP,
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REG_RBX,
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REG_RDX,
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REG_RAX,
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REG_RCX,
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REG_RSP,
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REG_RIP,
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REG_EFL,
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REG_CSGSFS,
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REG_ERR,
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REG_TRAPNO,
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REG_OLDMASK,
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REG_CR2,
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NGREG
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};
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// This struct is essentially the same as _fpstate in asm/sigcontext.h
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// except that the individual field names are chosen here to match the
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// ones used in breakpad for other x86_64 platforms.
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struct _libc_fpstate {
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/* 64-bit FXSAVE format. */
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uint16_t cwd;
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uint16_t swd;
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uint16_t ftw;
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uint16_t fop;
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uint64_t rip;
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uint64_t rdp;
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uint32_t mxcsr;
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uint32_t mxcr_mask;
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uint32_t _st[32]; // 128 bytes for the ST/MM registers 0-7
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uint32_t _xmm[64]; // 256 bytes for the XMM registers 0-7
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uint32_t padding[24]; // 96 bytes
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};
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typedef long greg_t;
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typedef greg_t gregset_t[NGREG];
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typedef struct _libc_fpstate* fpregset_t;
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typedef struct {
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gregset_t gregs;
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fpregset_t fpregs;
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uint64_t __reserved1[8];
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} mcontext_t;
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typedef struct ucontext {
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unsigned long 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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sigset_t uc_sigmask;
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uint64_t __padding[15];
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_libc_fpstate __fpregs_mem;
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} ucontext_t;
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#else
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# error "Unsupported Android CPU ABI!"
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#endif
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@ -143,6 +143,28 @@ struct user_fpregs_struct {
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unsigned int fir;
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};
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#elif defined(__x86_64__)
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#include <sys/types.h>
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#include_next <sys/user.h>
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// This struct is essentially the same as user_i387_struct in sys/user.h
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// except that the struct name and individual field names are chosen here
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// to match the ones used in breakpad for other x86_64 platforms.
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struct user_fpregs_struct {
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__u16 cwd;
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__u16 swd;
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__u16 ftw;
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__u16 fop;
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__u64 rip;
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__u64 rdp;
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__u32 mxcsr;
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__u32 mxcr_mask;
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__u32 st_space[32]; /* 8*16 bytes for each FP-reg = 128 bytes */
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__u32 xmm_space[64]; /* 16*16 bytes for each XMM-reg = 256 bytes */
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__u32 padding[24];
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};
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#else
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# error "Unsupported Android CPU ABI"
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#endif
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@ -103,6 +103,32 @@
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#define MCONTEXT_FPC_CSR 556
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#define UCONTEXT_SIGMASK_OFFSET 616
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#elif defined(__x86_64__)
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#define MCONTEXT_GREGS_OFFSET 40
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#define UCONTEXT_SIGMASK_OFFSET 296
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#define MCONTEXT_GREGS_R8 40
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#define MCONTEXT_GREGS_R9 48
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#define MCONTEXT_GREGS_R10 56
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#define MCONTEXT_GREGS_R11 64
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#define MCONTEXT_GREGS_R12 72
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#define MCONTEXT_GREGS_R13 80
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#define MCONTEXT_GREGS_R14 88
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#define MCONTEXT_GREGS_R15 96
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#define MCONTEXT_GREGS_RDI 104
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#define MCONTEXT_GREGS_RSI 112
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#define MCONTEXT_GREGS_RBP 120
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#define MCONTEXT_GREGS_RBX 128
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#define MCONTEXT_GREGS_RDX 136
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#define MCONTEXT_GREGS_RAX 144
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#define MCONTEXT_GREGS_RCX 152
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#define MCONTEXT_GREGS_RSP 160
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#define MCONTEXT_GREGS_RIP 168
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#define MCONTEXT_FPREGS_PTR 224
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#define MCONTEXT_FPREGS_MEM 424
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#define FPREGS_OFFSET_MXCSR 24
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#else
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#error "This header has not been ported for your CPU"
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#endif
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