Compute and pring the time that it takes to execute system calls. This data...

sandbox/linux/seccomp/trusted_thread.cc

 // Copyright (c) 2010 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "sandbox_impl.h"
 #include "syscall_table.h"
 
 namespace playground {
 
 void Sandbox::createTrustedThread(int processFdPub, int cloneFdPub,
@@ skipping 68 matching lines @@
       //   0x04: first argument; passed in %rdi
       //   0x0C: second argument; passed in %rsi
       //   0x14: third argument; passed in %rdx
       //   0x1C: fourth argument; passed in %r10
       //   0x24: fifth argument; passed in %r8
       //   0x2C: sixth argument; passed in %r9
       //   0x34: return value
       //   0x3C: RDTSCP result (%eax)
       //   0x40: RDTSCP result (%edx)
       //   0x44: RDTSCP result (%ecx)
+      //   0x48: last system call (not used on x86-64)
+      //   0x4C: number of consecutive calls to a time fnc (not used on x86-64)
+      //   0x50: nesting level of system calls (for debugging purposes only)
 
       // We use the %fs register for accessing the secure read-only page, and
       // the untrusted scratch space immediately following it. The segment
       // register and the local descriptor table is set up by passing
       // appropriate arguments to clone().
 
     "0:xor  %%rsp, %%rsp\n"
       "mov  $2, %%ebx\n"           // %rbx  = initial sequence number
 
       // Read request from untrusted thread, or from trusted process. In either
@@ skipping 593 matching lines @@
       //   0x0C: third argument; passed in %edx
       //   0x10: fourth argument; passed in %esi
       //   0x14: fifth argument; passed in %edi
       //   0x18: sixth argument; passed in %ebp
       //   0x1C: return value
       //   0x20: RDTSCP result (%eax)
       //   0x24: RDTSCP result (%edx)
       //   0x28: RDTSCP result (%ecx)
       //   0x2C: last system call (updated in syscall.cc)
       //   0x30: number of consecutive calls to a time fnc. (e.g. gettimeofday)
+      //   0x34: nesting level of system calls (for debugging purposes only)
 
     "0:xor  %%esp, %%esp\n"
       "mov  $2, %%eax\n"           // %mm2 = initial sequence number
       "movd %%eax, %%mm2\n"
 
       // Read request from untrusted thread, or from trusted process. In either
       // case, the data that we read has to be considered untrusted.
       // read(threadFd, &scratch, 4)
     "1:mov  $3, %%eax\n"           // NR_read
       "movd %%mm0, %%ebx\n"        // fd  = threadFd
@@ skipping 532 matching lines @@
       :
       : "g"(&args)
       : "eax", "ecx", "edx", "edi", "esi", "esp", "memory"
 #else
 #error Unsupported target platform
 #endif
 );
 }
 
 } // namespace