x86-gcc-main64.c

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

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// $HeadURL: https://hpctoolkit.googlecode.com/svn/trunk/src/tool/hpcrun/unwind/x86-family/manual-intervals/x86-intel11-f90main.c $
// $Id: x86-intel11-f90main.c 4422 2014-02-10 21:24:59Z mwkrentel $
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#include <string.h>
#include "x86-unwind-interval-fixup.h"
#include "x86-unwind-interval.h"

static char gcc_main64_signature[] = { 
 0x4c, 0x8d, 0x54, 0x24, 0x08,  // lea    0x8(%rsp),%r10
 0x48, 0x83, 0xe4, 0xe0,        // and    $0xffffffffffffffe0,%rsp
 0x41, 0xff, 0x72, 0xf8,        // pushq  -0x8(%r10)
 0x55,                          // push   %rbp
 0x48, 0x89, 0xe5,              // mov    %rsp,%rbp
};


int 
x86_adjust_gcc_main64_intervals(char *ins, int len, btuwi_status_t *stat)
{
  int siglen = sizeof(gcc_main64_signature);

  if (len > siglen && strncmp((char *)gcc_main64_signature, ins, siglen) == 0) {
    // signature matched 
    unwind_interval *ui = (unwind_interval *) stat->first;

    // this won't fix all of the intervals, but it will fix the ones 
    // that we care about.
    //
    // The method is as follows:
    // Ignore (do not correct) intervals before 1st std frame
    // For 1st STD_FRAME, compute the corrections for this interval and subsequent intervals
    // For this interval and subsequent interval, apply the corrected offsets
    //

    for(; UWI_RECIPE(ui)->ra_status != RA_STD_FRAME; ui = UWI_NEXT(ui));

    // this is only correct for 64-bit code
    for(; ui; ui =  UWI_NEXT(ui)) {
      x86recipe_t *xr = UWI_RECIPE(ui);
      if (xr->ra_status == RA_SP_RELATIVE) continue;
      if ((xr->ra_status == RA_STD_FRAME) || 
          (xr->ra_status == RA_BP_FRAME)) {  
         xr->ra_status = RA_BP_FRAME;
         xr->reg.bp_ra_pos = 8;
         xr->reg.bp_bp_pos = 0;
      }
    }

    return 1;
  } 
  return 0;
}