1                 : /*
       2                 :  * Copyright 2010 The Native Client Authors. All rights reserved.
       3                 :  * Use of this source code is governed by a BSD-style license that can
       4                 :  * be found in the LICENSE file.
       5                 :  */
       6                 : 
       7                 : #include <signal.h>
       8                 : #include <sys/ucontext.h>
       9                 : 
      10                 : #include "native_client/src/trusted/service_runtime/nacl_signal.h"
      11                 : 
      12                 : /*
      13                 :  * Definition of the POSIX ucontext_t for Mac OS X can be found in:
      14                 :  * /usr/include/mach/i386/_structs.h
      15                 :  */
      16                 : 
      17                 : #if __DARWIN_UNIX03
      18                 :   #define REG(R) uc_mcontext->__ss.__##R
      19                 : #else
      20                 :   #define REG(R) uc_mcontext->ss.R
      21                 : #endif
      22                 : 
      23                 : /*
      24                 :  * Fill a signal context structure from the raw platform dependent
      25                 :  * signal information.
      26                 :  */
      27                 : void NaClSignalContextFromHandler(struct NaClSignalContext *sigCtx,
      28               4 :                                   const void *rawCtx) {
      29               4 :   ucontext_t *uctx = (ucontext_t *) rawCtx;
      30                 : 
      31               4 :   sigCtx->prog_ctr = uctx->REG(eip);
      32               4 :   sigCtx->stack_ptr = uctx->REG(esp);
      33                 : 
      34               4 :   sigCtx->eax = uctx->REG(eax);
      35               4 :   sigCtx->ebx = uctx->REG(ebx);
      36               4 :   sigCtx->ecx = uctx->REG(ecx);
      37               4 :   sigCtx->edx = uctx->REG(edx);
      38               4 :   sigCtx->esi = uctx->REG(esi);
      39               4 :   sigCtx->edi = uctx->REG(edi);
      40               4 :   sigCtx->ebp = uctx->REG(ebp);
      41               4 :   sigCtx->flags = uctx->REG(eflags);
      42               4 :   sigCtx->cs = uctx->REG(cs);
      43               4 :   sigCtx->ss = uctx->REG(ss);
      44               4 :   sigCtx->ds = uctx->REG(ds);
      45               4 :   sigCtx->es = uctx->REG(es);
      46               4 :   sigCtx->fs = uctx->REG(fs);
      47               4 :   sigCtx->gs = uctx->REG(gs);
      48               4 : }
      49                 : 
      50                 : 
      51                 : /*
      52                 :  * Update the raw platform dependent signal information from the
      53                 :  * signal context structure.
      54                 :  */
      55                 : void NaClSignalContextToHandler(void *rawCtx,
      56               0 :                                 const struct NaClSignalContext *sigCtx) {
      57               0 :   ucontext_t *uctx = (ucontext_t *) rawCtx;
      58                 : 
      59               0 :   uctx->REG(eip) = sigCtx->prog_ctr;
      60               0 :   uctx->REG(esp) = sigCtx->stack_ptr;
      61                 : 
      62               0 :   uctx->REG(eax) = sigCtx->eax;
      63               0 :   uctx->REG(ebx) = sigCtx->ebx;
      64               0 :   uctx->REG(ecx) = sigCtx->ecx;
      65               0 :   uctx->REG(edx) = sigCtx->edx;
      66               0 :   uctx->REG(esi) = sigCtx->esi;
      67               0 :   uctx->REG(edi) = sigCtx->edi;
      68               0 :   uctx->REG(ebp) = sigCtx->ebp;
      69               0 :   uctx->REG(eflags) = sigCtx->flags;
      70               0 :   uctx->REG(cs) = sigCtx->cs;
      71               0 :   uctx->REG(ss) = sigCtx->ss;
      72               0 :   uctx->REG(ds) = sigCtx->ds;
      73               0 :   uctx->REG(es) = sigCtx->es;
      74               0 :   uctx->REG(fs) = sigCtx->fs;
      75               0 :   uctx->REG(gs) = sigCtx->gs;
      76               0 : }