am 7957529d: Merge "Clean up UnwindCurrent.cpp\'s use of ucontext.h."

#include "UnwindCurrent.h"

#include "UnwindMap.h"

// Define the ucontext_t structures needed for each supported arch.

#if defined(__arm__)

  // The current version of the <signal.h> doesn't define ucontext_t.

  #include <asm/sigcontext.h> // Ensure 'struct sigcontext' is defined.

  // Machine context at the time a signal was raised.

  typedef struct ucontext {

    uint32_t uc_flags;

    struct ucontext* uc_link;

    stack_t uc_stack;

    struct sigcontext uc_mcontext;

    uint32_t uc_sigmask;

  } ucontext_t;

#elif defined(__i386__)

  #include <asm/sigcontext.h>

  #include <asm/ucontext.h>

  typedef struct ucontext ucontext_t;

#elif !defined(__mips__) && !defined(__aarch64__)

  #error Unsupported architecture.

#endif

#include <ucontext.h>

//-------------------------------------------------------------------------

// UnwindCurrent functions.

  context->regs[13] = uc->uc_mcontext.arm_sp;

  context->regs[14] = uc->uc_mcontext.arm_lr;

  context->regs[15] = uc->uc_mcontext.arm_pc;

#elif defined(__mips__) || defined(__i386__)

#else

  context->uc_mcontext = uc->uc_mcontext;

#endif

}