src/breakpad/src/common/android/breakpad_getcontext_unittest.cc

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  29
  30 #if defined(__x86_64__)
  31 #include <asm/sigcontext.h>
  32 #endif
  33
  34 #include <sys/ucontext.h>
  35
  36 #include "breakpad_googletest_includes.h"
  37 #include "common/android/ucontext_constants.h"
  38
  39 template <int left, int right>
  40 struct CompileAssertEquals {
  41   // a compilation error here indicates left and right are not equal.
  42   char left_too_large[right - left];
  43   // a compilation error here indicates left and right are not equal.
  44   char right_too_large[left - right];
  45 };
  46
  47 #define COMPILE_ASSERT_EQ(left, right, tag) \
  48   CompileAssertEquals<left, right> tag;
  49
  50 TEST(AndroidUContext, GRegsOffset) {
  51 #if defined(__arm__)
  52   // There is no gregs[] array on ARM, so compare to the offset of
  53   // first register fields, since they're stored in order.
  54   ASSERT_EQ(static_cast<size_t>(MCONTEXT_GREGS_OFFSET),
  55             offsetof(ucontext_t,uc_mcontext.arm_r0));
  56 #elif defined(__aarch64__)
  57   // There is no gregs[] array on ARM, so compare to the offset of
  58   // first register fields, since they're stored in order.
  59   ASSERT_EQ(static_cast<size_t>(MCONTEXT_GREGS_OFFSET),
  60             offsetof(ucontext_t,uc_mcontext.regs[0]));
  61   ASSERT_EQ(static_cast<size_t>(MCONTEXT_SP_OFFSET),
  62             offsetof(ucontext_t,uc_mcontext.sp));
  63   ASSERT_EQ(static_cast<size_t>(MCONTEXT_PC_OFFSET),
  64             offsetof(ucontext_t,uc_mcontext.pc));
  65   ASSERT_EQ(static_cast<size_t>(MCONTEXT_PSTATE_OFFSET),
  66             offsetof(ucontext_t,uc_mcontext.pstate));
  67   ASSERT_EQ(static_cast<size_t>(MCONTEXT_EXTENSION_OFFSET),
  68             offsetof(ucontext_t,uc_mcontext.__reserved));
  69 #elif defined(__i386__)
  70   ASSERT_EQ(static_cast<size_t>(MCONTEXT_GREGS_OFFSET),
  71             offsetof(ucontext_t,uc_mcontext.gregs));
  72 #define CHECK_REG(x) \
  73   ASSERT_EQ(static_cast<size_t>(MCONTEXT_##x##_OFFSET),         \
  74             offsetof(ucontext_t,uc_mcontext.gregs[REG_##x]))
  75   CHECK_REG(GS);
  76   CHECK_REG(FS);
  77   CHECK_REG(ES);
  78   CHECK_REG(DS);
  79   CHECK_REG(EDI);
  80   CHECK_REG(ESI);
  81   CHECK_REG(EBP);
  82   CHECK_REG(ESP);
  83   CHECK_REG(EBX);
  84   CHECK_REG(EDX);
  85   CHECK_REG(ECX);
  86   CHECK_REG(EAX);
  87   CHECK_REG(TRAPNO);
  88   CHECK_REG(ERR);
  89   CHECK_REG(EIP);
  90   CHECK_REG(CS);
  91   CHECK_REG(EFL);
  92   CHECK_REG(UESP);
  93   CHECK_REG(SS);
  94
  95   ASSERT_EQ(static_cast<size_t>(UCONTEXT_FPREGS_OFFSET),
  96             offsetof(ucontext_t,uc_mcontext.fpregs));
  97
  98   ASSERT_EQ(static_cast<size_t>(UCONTEXT_FPREGS_MEM_OFFSET),
  99             offsetof(ucontext_t,__fpregs_mem));
 100 #elif defined(__mips__)
 101   ASSERT_EQ(static_cast<size_t>(MCONTEXT_GREGS_OFFSET),
 102             offsetof(ucontext_t,uc_mcontext.gregs));
 103
 104   // PC for mips is not part of gregs.
 105   ASSERT_EQ(static_cast<size_t>(MCONTEXT_PC_OFFSET),
 106             offsetof(ucontext_t,uc_mcontext.pc));
 107
 108   ASSERT_EQ(static_cast<size_t>(MCONTEXT_FPREGS_OFFSET),
 109             offsetof(ucontext_t,uc_mcontext.fpregs));
 110
 111   ASSERT_EQ(static_cast<size_t>(MCONTEXT_FPC_CSR),
 112             offsetof(ucontext_t,uc_mcontext.fpc_csr));
 113 #elif defined(__x86_64__)
 114
 115   COMPILE_ASSERT_EQ(static_cast<size_t>(MCONTEXT_GREGS_OFFSET),
 116                     offsetof(ucontext_t,uc_mcontext.gregs),
 117                     mcontext_gregs_offset);
 118 #define CHECK_REG(x) \
 119   COMPILE_ASSERT_EQ(static_cast<size_t>(MCONTEXT_GREGS_##x), \
 120                     offsetof(ucontext_t,uc_mcontext.gregs[REG_##x]), reg_##x)
 121   CHECK_REG(R8);
 122   CHECK_REG(R9);
 123   CHECK_REG(R10);
 124   CHECK_REG(R11);
 125   CHECK_REG(R12);
 126   CHECK_REG(R13);
 127   CHECK_REG(R14);
 128   CHECK_REG(R15);
 129   CHECK_REG(RDI);
 130   CHECK_REG(RSI);
 131   CHECK_REG(RBP);
 132   CHECK_REG(RBX);
 133   CHECK_REG(RDX);
 134   CHECK_REG(RAX);
 135   CHECK_REG(RCX);
 136   CHECK_REG(RSP);
 137   CHECK_REG(RIP);
 138
 139   // sigcontext is an analog to mcontext_t. The layout should be the same.
 140   COMPILE_ASSERT_EQ(offsetof(mcontext_t,fpregs),
 141                     offsetof(sigcontext,fpstate), sigcontext_fpstate);
 142   // Check that _fpstate from asm/sigcontext.h is essentially the same
 143   // as _libc_fpstate.
 144   COMPILE_ASSERT_EQ(sizeof(_libc_fpstate), sizeof(_fpstate),
 145                     sigcontext_fpstate_size);
 146   COMPILE_ASSERT_EQ(offsetof(_libc_fpstate,cwd),offsetof(_fpstate,cwd),
 147                     sigcontext_fpstate_cwd);
 148   COMPILE_ASSERT_EQ(offsetof(_libc_fpstate,swd),offsetof(_fpstate,swd),
 149                     sigcontext_fpstate_swd);
 150   COMPILE_ASSERT_EQ(offsetof(_libc_fpstate,ftw),offsetof(_fpstate,twd),
 151                     sigcontext_fpstate_twd);
 152   COMPILE_ASSERT_EQ(offsetof(_libc_fpstate,fop),offsetof(_fpstate,fop),
 153                     sigcontext_fpstate_fop);
 154   COMPILE_ASSERT_EQ(offsetof(_libc_fpstate,rip),offsetof(_fpstate,rip),
 155                     sigcontext_fpstate_rip);
 156   COMPILE_ASSERT_EQ(offsetof(_libc_fpstate,rdp),offsetof(_fpstate,rdp),
 157                     sigcontext_fpstate_rdp);
 158   COMPILE_ASSERT_EQ(offsetof(_libc_fpstate,mxcsr),offsetof(_fpstate,mxcsr),
 159                     sigcontext_fpstate_mxcsr);
 160   COMPILE_ASSERT_EQ(offsetof(_libc_fpstate,mxcr_mask),
 161                     offsetof(_fpstate,mxcsr_mask),
 162                     sigcontext_fpstate_mxcsr_mask);
 163   COMPILE_ASSERT_EQ(offsetof(_libc_fpstate,_st), offsetof(_fpstate,st_space),
 164                     sigcontext_fpstate_stspace);
 165   COMPILE_ASSERT_EQ(offsetof(_libc_fpstate,_xmm), offsetof(_fpstate,xmm_space),
 166                     sigcontext_fpstate_xmm_space);
 167
 168   COMPILE_ASSERT_EQ(MCONTEXT_FPREGS_PTR,
 169                     offsetof(ucontext_t,uc_mcontext.fpregs),
 170                     mcontext_fpregs_ptr);
 171   COMPILE_ASSERT_EQ(MCONTEXT_FPREGS_MEM, offsetof(ucontext_t,__fpregs_mem),
 172                     mcontext_fpregs_mem);
 173   COMPILE_ASSERT_EQ(FPREGS_OFFSET_MXCSR, offsetof(_libc_fpstate,mxcsr),
 174                     fpregs_offset_mxcsr);
 175   COMPILE_ASSERT_EQ(UCONTEXT_SIGMASK_OFFSET, offsetof(ucontext_t, uc_sigmask),
 176                     ucontext_sigmask);
 177 #else
 178   ASSERT_EQ(static_cast<size_t>(MCONTEXT_GREGS_OFFSET),
 179             offsetof(ucontext_t,uc_mcontext.gregs));
 180 #endif
 181 }
 182
 183 TEST(AndroidUContext, SigmakOffset) {
 184   ASSERT_EQ(static_cast<size_t>(UCONTEXT_SIGMASK_OFFSET),
 185             offsetof(ucontext_t,uc_sigmask));
 186 }