1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
/* ssw3i6pc.c: STACK SCANNING FOR WIN64 WITH PELLES C
 *
 * $Id: //info.ravenbrook.com/project/mps/version/1.116/code/ssw3i6pc.c#1 $
 * Copyright (c) 2001-2014 Ravenbrook Limited.  See end of file for license.
 *
 * This scans the stack and fixes the registers which may contain roots.
 * See <design/thread-manager/>.
 *
 * .assume.ms-compat: We rely on the fact that Pelles C's setjmp stores
 * the callee-save registers in the jmp_buf and is compatible with Microsoft
 * C.  The Pelles C 7.00 setjmp.h header has a comment "MS compatible".  See
 * also "Is Pelles C's jmp_buf compatible with Microsoft C's?"
 * <http://forum.pellesc.de/index.php?topic=5464>
 *
 * REFERENCES
 *
 * "Overview of x64 Calling Conventions"; MSDN; Microsoft Corporation;
 * <http://msdn.microsoft.com/en-us/library/ms235286%28v=vs.100%29.aspx>.
 *
 * "Caller/Callee Saved Registers"; MSDN; Microsoft Corporation;
 * <http://msdn.microsoft.com/en-us/library/6t169e9c%28v=vs.100%29.aspx>.
 *
 * "Register Usage"; MSDN; Microsoft Corporation;
 * <http://msdn.microsoft.com/en-us/library/9z1stfyw%28v=vs.100%29.aspx>.
 *
 * "Calling conventions for different C++ compilers and operating systems";
 * Agner Fog; Copenhagen University College of Engineering; 2012-02-29;
 * <http://agner.org./optimize/calling_conventions.pdf>.
 */

#include "mpm.h"
#include <setjmp.h>

SRCID(ssw3i6pc, "$Id: //info.ravenbrook.com/project/mps/version/1.116/code/ssw3i6pc.c#1 $");


/* This definition isn't in the Pelles C headers, so we reproduce it here.
 * See .assume.ms-compat. */

typedef /* _CRT_ALIGN(16) */ struct _SETJMP_FLOAT128 {
    unsigned __int64 Part[2];
} SETJMP_FLOAT128;

typedef struct _JUMP_BUFFER {
    unsigned __int64 Frame;
    unsigned __int64 Rbx;
    unsigned __int64 Rsp;
    unsigned __int64 Rbp;
    unsigned __int64 Rsi;
    unsigned __int64 Rdi;
    unsigned __int64 R12;
    unsigned __int64 R13;
    unsigned __int64 R14;
    unsigned __int64 R15;
    unsigned __int64 Rip;
    unsigned __int64 Spare;
    
    SETJMP_FLOAT128 Xmm6;
    SETJMP_FLOAT128 Xmm7;
    SETJMP_FLOAT128 Xmm8;
    SETJMP_FLOAT128 Xmm9;
    SETJMP_FLOAT128 Xmm10;
    SETJMP_FLOAT128 Xmm11;
    SETJMP_FLOAT128 Xmm12;
    SETJMP_FLOAT128 Xmm13;
    SETJMP_FLOAT128 Xmm14;
    SETJMP_FLOAT128 Xmm15;
} _JUMP_BUFFER;


Res StackScan(ScanState ss, Word *stackCold, Word mask, Word pattern)
{
  jmp_buf jb;

  /* We rely on the fact that Pelles C's setjmp stores the callee-save
     registers in the jmp_buf. */
  (void)setjmp(jb);

  /* These checks, on the _JUMP_BUFFER defined above, are mainly here
   * to maintain similarity to the matching code on the MPS_BUILD_MV
   * version of this code. */
  AVER(sizeof(((_JUMP_BUFFER *)jb)->Rbx) == sizeof(Word));
  AVER(sizeof(((_JUMP_BUFFER *)jb)->Rsp) == sizeof(Word));
  AVER(sizeof(((_JUMP_BUFFER *)jb)->Rbp) == sizeof(Word));
  AVER(sizeof(((_JUMP_BUFFER *)jb)->Rsi) == sizeof(Word));
  AVER(sizeof(((_JUMP_BUFFER *)jb)->Rdi) == sizeof(Word));
  AVER(sizeof(((_JUMP_BUFFER *)jb)->R12) == sizeof(Word));
  AVER(sizeof(((_JUMP_BUFFER *)jb)->R13) == sizeof(Word));
  AVER(sizeof(((_JUMP_BUFFER *)jb)->R14) == sizeof(Word));
  AVER(sizeof(((_JUMP_BUFFER *)jb)->R15) == sizeof(Word));

  /* The layout of the jmp_buf forces us to harmlessly scan Rsp as well. */
  AVER(offsetof(_JUMP_BUFFER, Rsp) == offsetof(_JUMP_BUFFER, Rbx) + 8);
  AVER(offsetof(_JUMP_BUFFER, Rbp) == offsetof(_JUMP_BUFFER, Rbx) + 16);
  AVER(offsetof(_JUMP_BUFFER, Rsi) == offsetof(_JUMP_BUFFER, Rbx) + 24);
  AVER(offsetof(_JUMP_BUFFER, Rdi) == offsetof(_JUMP_BUFFER, Rbx) + 32);
  AVER(offsetof(_JUMP_BUFFER, R12) == offsetof(_JUMP_BUFFER, Rbx) + 40);
  AVER(offsetof(_JUMP_BUFFER, R13) == offsetof(_JUMP_BUFFER, Rbx) + 48);
  AVER(offsetof(_JUMP_BUFFER, R14) == offsetof(_JUMP_BUFFER, Rbx) + 56);
  AVER(offsetof(_JUMP_BUFFER, R15) == offsetof(_JUMP_BUFFER, Rbx) + 64);

  return StackScanInner(ss, stackCold, (Word *)&((_JUMP_BUFFER *)jb)->Rbx, 9,
                        mask, pattern);
}


/* C. COPYRIGHT AND LICENSE
 *
 * Copyright (C) 2001-2014 Ravenbrook Limited <http://www.ravenbrook.com/>.
 * All rights reserved.  This is an open source license.  Contact
 * Ravenbrook for commercial licensing options.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 * 
 * 1. Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 * 
 * 2. Redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the distribution.
 * 
 * 3. Redistributions in any form must be accompanied by information on how
 * to obtain complete source code for this software and any accompanying
 * software that uses this software.  The source code must either be
 * included in the distribution or be available for no more than the cost
 * of distribution plus a nominal fee, and must be freely redistributable
 * under reasonable conditions.  For an executable file, complete source
 * code means the source code for all modules it contains. It does not
 * include source code for modules or files that typically accompany the
 * major components of the operating system on which the executable file
 * runs.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
 * PURPOSE, OR NON-INFRINGEMENT, ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT HOLDERS AND CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */