specific-inline-asm-gctxt.h

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// -*-Mode: C++;-*- // technically C99

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#ifndef SPECIFIC_INLINE_ASM_GCTXT
#define SPECIFIC_INLINE_ASM_GCTXT

//***************************************************************************
// local include files 
//***************************************************************************

#include <utilities/arch/ucontext-manip.h>



//***************************************************************************
// macros 
//***************************************************************************

// macro: INLINE_ASM_GCTXT 
// purpose:
//   lightweight version of getcontext, which saves 
//   PC, BP, SP into a ucontext structure in their
//   normal positions 

#define INLINE_ASM_GCTXT(uc)                               \
  /* load PC into RAX; save RAX into uc structure   */     \
  asm volatile ("leaq 0(%%rip), %%rax\n\t"                 \
                "movq %%rax, %0"                           \
                : "=m" (UC_REG_IP(uc)) /* output    */     \
                :                      /* no inputs */     \
                : "%rax"               /* clobbered */ );  \
  /* save BP into uc structure                      */     \
  asm volatile ("movq %%rbp, %0"                           \
                : "=m" (UC_REG_BP(uc)) /* output    */ );  \
  /* save SP into uc structure                      */     \
  asm volatile ("movq %%rsp, %0"                           \
                : "=m" (UC_REG_SP(uc)) /* output    */ )



#endif // SPECIFIC_INLINE_ASM_GCTXT